fs/f2fs/segment.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/segment.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/bio.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/sched/mm.h>
  13 #include <linux/prefetch.h>
  14 #include <linux/kthread.h>
  15 #include <linux/swap.h>
  16 #include <linux/timer.h>
  17 #include <linux/freezer.h>
  18 #include <linux/sched/signal.h>
  19 #include <linux/random.h>
  20
  21 #include "f2fs.h"
  22 #include "segment.h"
  23 #include "node.h"
  24 #include "gc.h"
  25 #include "iostat.h"
  26 #include <trace/events/f2fs.h>
  27
  28 #define __reverse_ffz(x) __reverse_ffs(~(x))
  29
  30 static struct kmem_cache *discard_entry_slab;
  31 static struct kmem_cache *discard_cmd_slab;
  32 static struct kmem_cache *sit_entry_set_slab;
  33 static struct kmem_cache *inmem_entry_slab;
  34
  35 static unsigned long __reverse_ulong(unsigned char *str)
  36 {
  37         unsigned long tmp = 0;
  38         int shift = 24, idx = 0;
  39
  40 #if BITS_PER_LONG == 64
  41         shift = 56;
  42 #endif
  43         while (shift >= 0) {
  44                 tmp |= (unsigned long)str[idx++] << shift;
  45                 shift -= BITS_PER_BYTE;
  46         }
  47         return tmp;
  48 }
  49
  50 /*
  51  * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
  52  * MSB and LSB are reversed in a byte by f2fs_set_bit.
  53  */
  54 static inline unsigned long __reverse_ffs(unsigned long word)
  55 {
  56         int num = 0;
  57
  58 #if BITS_PER_LONG == 64
  59         if ((word & 0xffffffff00000000UL) == 0)
  60                 num += 32;
  61         else
  62                 word >>= 32;
  63 #endif
  64         if ((word & 0xffff0000) == 0)
  65                 num += 16;
  66         else
  67                 word >>= 16;
  68
  69         if ((word & 0xff00) == 0)
  70                 num += 8;
  71         else
  72                 word >>= 8;
  73
  74         if ((word & 0xf0) == 0)
  75                 num += 4;
  76         else
  77                 word >>= 4;
  78
  79         if ((word & 0xc) == 0)
  80                 num += 2;
  81         else
  82                 word >>= 2;
  83
  84         if ((word & 0x2) == 0)
  85                 num += 1;
  86         return num;
  87 }
  88
  89 /*
  90  * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
  91  * f2fs_set_bit makes MSB and LSB reversed in a byte.
  92  * @size must be integral times of unsigned long.
  93  * Example:
  94  *                             MSB <--> LSB
  95  *   f2fs_set_bit(0, bitmap) => 1000 0000
  96  *   f2fs_set_bit(7, bitmap) => 0000 0001
  97  */
  98 static unsigned long __find_rev_next_bit(const unsigned long *addr,
  99                         unsigned long size, unsigned long offset)
 100 {
 101         const unsigned long *p = addr + BIT_WORD(offset);
 102         unsigned long result = size;
 103         unsigned long tmp;
 104
 105         if (offset >= size)
 106                 return size;
 107
 108         size -= (offset & ~(BITS_PER_LONG - 1));
 109         offset %= BITS_PER_LONG;
 110
 111         while (1) {
 112                 if (*p == 0)
 113                         goto pass;
 114
 115                 tmp = __reverse_ulong((unsigned char *)p);
 116
 117                 tmp &= ~0UL >> offset;
 118                 if (size < BITS_PER_LONG)
 119                         tmp &= (~0UL << (BITS_PER_LONG - size));
 120                 if (tmp)
 121                         goto found;
 122 pass:
 123                 if (size <= BITS_PER_LONG)
 124                         break;
 125                 size -= BITS_PER_LONG;
 126                 offset = 0;
 127                 p++;
 128         }
 129         return result;
 130 found:
 131         return result - size + __reverse_ffs(tmp);
 132 }
 133
 134 static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
 135                         unsigned long size, unsigned long offset)
 136 {
 137         const unsigned long *p = addr + BIT_WORD(offset);
 138         unsigned long result = size;
 139         unsigned long tmp;
 140
 141         if (offset >= size)
 142                 return size;
 143
 144         size -= (offset & ~(BITS_PER_LONG - 1));
 145         offset %= BITS_PER_LONG;
 146
 147         while (1) {
 148                 if (*p == ~0UL)
 149                         goto pass;
 150
 151                 tmp = __reverse_ulong((unsigned char *)p);
 152
 153                 if (offset)
 154                         tmp |= ~0UL << (BITS_PER_LONG - offset);
 155                 if (size < BITS_PER_LONG)
 156                         tmp |= ~0UL >> size;
 157                 if (tmp != ~0UL)
 158                         goto found;
 159 pass:
 160                 if (size <= BITS_PER_LONG)
 161                         break;
 162                 size -= BITS_PER_LONG;
 163                 offset = 0;
 164                 p++;
 165         }
 166         return result;
 167 found:
 168         return result - size + __reverse_ffz(tmp);
 169 }
 170
 171 bool f2fs_need_SSR(struct f2fs_sb_info *sbi)
 172 {
 173         int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
 174         int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
 175         int imeta_secs = get_blocktype_secs(sbi, F2FS_DIRTY_IMETA);
 176
 177         if (f2fs_lfs_mode(sbi))
 178                 return false;
 179         if (sbi->gc_mode == GC_URGENT_HIGH)
 180                 return true;
 181         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
 182                 return true;
 183
 184         return free_sections(sbi) <= (node_secs + 2 * dent_secs + imeta_secs +
 185                         SM_I(sbi)->min_ssr_sections + reserved_sections(sbi));
 186 }
 187
 188 void f2fs_register_inmem_page(struct inode *inode, struct page *page)
 189 {
 190         struct inmem_pages *new;
 191
 192         set_page_private_atomic(page);
 193
 194         new = f2fs_kmem_cache_alloc(inmem_entry_slab,
 195                                         GFP_NOFS, true, NULL);
 196
 197         /* add atomic page indices to the list */
 198         new->page = page;
 199         INIT_LIST_HEAD(&new->list);
 200
 201         /* increase reference count with clean state */
 202         get_page(page);
 203         mutex_lock(&F2FS_I(inode)->inmem_lock);
 204         list_add_tail(&new->list, &F2FS_I(inode)->inmem_pages);
 205         inc_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 206         mutex_unlock(&F2FS_I(inode)->inmem_lock);
 207
 208         trace_f2fs_register_inmem_page(page, INMEM);
 209 }
 210
 211 static int __revoke_inmem_pages(struct inode *inode,
 212                                 struct list_head *head, bool drop, bool recover,
 213                                 bool trylock)
 214 {
 215         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 216         struct inmem_pages *cur, *tmp;
 217         int err = 0;
 218
 219         list_for_each_entry_safe(cur, tmp, head, list) {
 220                 struct page *page = cur->page;
 221
 222                 if (drop)
 223                         trace_f2fs_commit_inmem_page(page, INMEM_DROP);
 224
 225                 if (trylock) {
 226                         /*
 227                          * to avoid deadlock in between page lock and
 228                          * inmem_lock.
 229                          */
 230                         if (!trylock_page(page))
 231                                 continue;
 232                 } else {
 233                         lock_page(page);
 234                 }
 235
 236                 f2fs_wait_on_page_writeback(page, DATA, true, true);
 237
 238                 if (recover) {
 239                         struct dnode_of_data dn;
 240                         struct node_info ni;
 241
 242                         trace_f2fs_commit_inmem_page(page, INMEM_REVOKE);
 243 retry:
 244                         set_new_dnode(&dn, inode, NULL, NULL, 0);
 245                         err = f2fs_get_dnode_of_data(&dn, page->index,
 246                                                                 LOOKUP_NODE);
 247                         if (err) {
 248                                 if (err == -ENOMEM) {
 249                                         memalloc_retry_wait(GFP_NOFS);
 250                                         goto retry;
 251                                 }
 252                                 err = -EAGAIN;
 253                                 goto next;
 254                         }
 255
 256                         err = f2fs_get_node_info(sbi, dn.nid, &ni, false);
 257                         if (err) {
 258                                 f2fs_put_dnode(&dn);
 259                                 return err;
 260                         }
 261
 262                         if (cur->old_addr == NEW_ADDR) {
 263                                 f2fs_invalidate_blocks(sbi, dn.data_blkaddr);
 264                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
 265                         } else
 266                                 f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
 267                                         cur->old_addr, ni.version, true, true);
 268                         f2fs_put_dnode(&dn);
 269                 }
 270 next:
 271                 /* we don't need to invalidate this in the sccessful status */
 272                 if (drop || recover) {
 273                         ClearPageUptodate(page);
 274                         clear_page_private_gcing(page);
 275                 }
 276                 detach_page_private(page);
 277                 set_page_private(page, 0);
 278                 f2fs_put_page(page, 1);
 279
 280                 list_del(&cur->list);
 281                 kmem_cache_free(inmem_entry_slab, cur);
 282                 dec_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 283         }
 284         return err;
 285 }
 286
 287 void f2fs_drop_inmem_pages_all(struct f2fs_sb_info *sbi, bool gc_failure)
 288 {
 289         struct list_head *head = &sbi->inode_list[ATOMIC_FILE];
 290         struct inode *inode;
 291         struct f2fs_inode_info *fi;
 292         unsigned int count = sbi->atomic_files;
 293         unsigned int looped = 0;
 294 next:
 295         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 296         if (list_empty(head)) {
 297                 spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 298                 return;
 299         }
 300         fi = list_first_entry(head, struct f2fs_inode_info, inmem_ilist);
 301         inode = igrab(&fi->vfs_inode);
 302         if (inode)
 303                 list_move_tail(&fi->inmem_ilist, head);
 304         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 305
 306         if (inode) {
 307                 if (gc_failure) {
 308                         if (!fi->i_gc_failures[GC_FAILURE_ATOMIC])
 309                                 goto skip;
 310                 }
 311                 set_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
 312                 f2fs_drop_inmem_pages(inode);
 313 skip:
 314                 iput(inode);
 315         }
 316         congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
 317         cond_resched();
 318         if (gc_failure) {
 319                 if (++looped >= count)
 320                         return;
 321         }
 322         goto next;
 323 }
 324
 325 void f2fs_drop_inmem_pages(struct inode *inode)
 326 {
 327         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 328         struct f2fs_inode_info *fi = F2FS_I(inode);
 329
 330         do {
 331                 mutex_lock(&fi->inmem_lock);
 332                 if (list_empty(&fi->inmem_pages)) {
 333                         fi->i_gc_failures[GC_FAILURE_ATOMIC] = 0;
 334
 335                         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 336                         if (!list_empty(&fi->inmem_ilist))
 337                                 list_del_init(&fi->inmem_ilist);
 338                         if (f2fs_is_atomic_file(inode)) {
 339                                 clear_inode_flag(inode, FI_ATOMIC_FILE);
 340                                 sbi->atomic_files--;
 341                         }
 342                         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 343
 344                         mutex_unlock(&fi->inmem_lock);
 345                         break;
 346                 }
 347                 __revoke_inmem_pages(inode, &fi->inmem_pages,
 348                                                 true, false, true);
 349                 mutex_unlock(&fi->inmem_lock);
 350         } while (1);
 351 }
 352
 353 void f2fs_drop_inmem_page(struct inode *inode, struct page *page)
 354 {
 355         struct f2fs_inode_info *fi = F2FS_I(inode);
 356         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 357         struct list_head *head = &fi->inmem_pages;
 358         struct inmem_pages *cur = NULL;
 359
 360         f2fs_bug_on(sbi, !page_private_atomic(page));
 361
 362         mutex_lock(&fi->inmem_lock);
 363         list_for_each_entry(cur, head, list) {
 364                 if (cur->page == page)
 365                         break;
 366         }
 367
 368         f2fs_bug_on(sbi, list_empty(head) || cur->page != page);
 369         list_del(&cur->list);
 370         mutex_unlock(&fi->inmem_lock);
 371
 372         dec_page_count(sbi, F2FS_INMEM_PAGES);
 373         kmem_cache_free(inmem_entry_slab, cur);
 374
 375         ClearPageUptodate(page);
 376         clear_page_private_atomic(page);
 377         f2fs_put_page(page, 0);
 378
 379         detach_page_private(page);
 380         set_page_private(page, 0);
 381
 382         trace_f2fs_commit_inmem_page(page, INMEM_INVALIDATE);
 383 }
 384
 385 static int __f2fs_commit_inmem_pages(struct inode *inode)
 386 {
 387         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 388         struct f2fs_inode_info *fi = F2FS_I(inode);
 389         struct inmem_pages *cur, *tmp;
 390         struct f2fs_io_info fio = {
 391                 .sbi = sbi,
 392                 .ino = inode->i_ino,
 393                 .type = DATA,
 394                 .op = REQ_OP_WRITE,
 395                 .op_flags = REQ_SYNC | REQ_PRIO,
 396                 .io_type = FS_DATA_IO,
 397         };
 398         struct list_head revoke_list;
 399         bool submit_bio = false;
 400         int err = 0;
 401
 402         INIT_LIST_HEAD(&revoke_list);
 403
 404         list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
 405                 struct page *page = cur->page;
 406
 407                 lock_page(page);
 408                 if (page->mapping == inode->i_mapping) {
 409                         trace_f2fs_commit_inmem_page(page, INMEM);
 410
 411                         f2fs_wait_on_page_writeback(page, DATA, true, true);
 412
 413                         set_page_dirty(page);
 414                         if (clear_page_dirty_for_io(page)) {
 415                                 inode_dec_dirty_pages(inode);
 416                                 f2fs_remove_dirty_inode(inode);
 417                         }
 418 retry:
 419                         fio.page = page;
 420                         fio.old_blkaddr = NULL_ADDR;
 421                         fio.encrypted_page = NULL;
 422                         fio.need_lock = LOCK_DONE;
 423                         err = f2fs_do_write_data_page(&fio);
 424                         if (err) {
 425                                 if (err == -ENOMEM) {
 426                                         memalloc_retry_wait(GFP_NOFS);
 427                                         goto retry;
 428                                 }
 429                                 unlock_page(page);
 430                                 break;
 431                         }
 432                         /* record old blkaddr for revoking */
 433                         cur->old_addr = fio.old_blkaddr;
 434                         submit_bio = true;
 435                 }
 436                 unlock_page(page);
 437                 list_move_tail(&cur->list, &revoke_list);
 438         }
 439
 440         if (submit_bio)
 441                 f2fs_submit_merged_write_cond(sbi, inode, NULL, 0, DATA);
 442
 443         if (err) {
 444                 /*
 445                  * try to revoke all committed pages, but still we could fail
 446                  * due to no memory or other reason, if that happened, EAGAIN
 447                  * will be returned, which means in such case, transaction is
 448                  * already not integrity, caller should use journal to do the
 449                  * recovery or rewrite & commit last transaction. For other
 450                  * error number, revoking was done by filesystem itself.
 451                  */
 452                 err = __revoke_inmem_pages(inode, &revoke_list,
 453                                                 false, true, false);
 454
 455                 /* drop all uncommitted pages */
 456                 __revoke_inmem_pages(inode, &fi->inmem_pages,
 457                                                 true, false, false);
 458         } else {
 459                 __revoke_inmem_pages(inode, &revoke_list,
 460                                                 false, false, false);
 461         }
 462
 463         return err;
 464 }
 465
 466 int f2fs_commit_inmem_pages(struct inode *inode)
 467 {
 468         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 469         struct f2fs_inode_info *fi = F2FS_I(inode);
 470         int err;
 471
 472         f2fs_balance_fs(sbi, true);
 473
 474         down_write(&fi->i_gc_rwsem[WRITE]);
 475
 476         f2fs_lock_op(sbi);
 477         set_inode_flag(inode, FI_ATOMIC_COMMIT);
 478
 479         mutex_lock(&fi->inmem_lock);
 480         err = __f2fs_commit_inmem_pages(inode);
 481         mutex_unlock(&fi->inmem_lock);
 482
 483         clear_inode_flag(inode, FI_ATOMIC_COMMIT);
 484
 485         f2fs_unlock_op(sbi);
 486         up_write(&fi->i_gc_rwsem[WRITE]);
 487
 488         return err;
 489 }
 490
 491 /*
 492  * This function balances dirty node and dentry pages.
 493  * In addition, it controls garbage collection.
 494  */
 495 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 496 {
 497         if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
 498                 f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
 499                 f2fs_stop_checkpoint(sbi, false);
 500         }
 501
 502         /* balance_fs_bg is able to be pending */
 503         if (need && excess_cached_nats(sbi))
 504                 f2fs_balance_fs_bg(sbi, false);
 505
 506         if (!f2fs_is_checkpoint_ready(sbi))
 507                 return;
 508
 509         /*
 510          * We should do GC or end up with checkpoint, if there are so many dirty
 511          * dir/node pages without enough free segments.
 512          */
 513         if (has_not_enough_free_secs(sbi, 0, 0)) {
 514                 if (test_opt(sbi, GC_MERGE) && sbi->gc_thread &&
 515                                         sbi->gc_thread->f2fs_gc_task) {
 516                         DEFINE_WAIT(wait);
 517
 518                         prepare_to_wait(&sbi->gc_thread->fggc_wq, &wait,
 519                                                 TASK_UNINTERRUPTIBLE);
 520                         wake_up(&sbi->gc_thread->gc_wait_queue_head);
 521                         io_schedule();
 522                         finish_wait(&sbi->gc_thread->fggc_wq, &wait);
 523                 } else {
 524                         down_write(&sbi->gc_lock);
 525                         f2fs_gc(sbi, false, false, false, NULL_SEGNO);
 526                 }
 527         }
 528 }
 529
 530 static inline bool excess_dirty_threshold(struct f2fs_sb_info *sbi)
 531 {
 532         int factor = rwsem_is_locked(&sbi->cp_rwsem) ? 3 : 2;
 533         unsigned int dents = get_pages(sbi, F2FS_DIRTY_DENTS);
 534         unsigned int qdata = get_pages(sbi, F2FS_DIRTY_QDATA);
 535         unsigned int nodes = get_pages(sbi, F2FS_DIRTY_NODES);
 536         unsigned int meta = get_pages(sbi, F2FS_DIRTY_META);
 537         unsigned int imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
 538         unsigned int threshold = sbi->blocks_per_seg * factor *
 539                                         DEFAULT_DIRTY_THRESHOLD;
 540         unsigned int global_threshold = threshold * 3 / 2;
 541
 542         if (dents >= threshold || qdata >= threshold ||
 543                 nodes >= threshold || meta >= threshold ||
 544                 imeta >= threshold)
 545                 return true;
 546         return dents + qdata + nodes + meta + imeta >  global_threshold;
 547 }
 548
 549 void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
 550 {
 551         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 552                 return;
 553
 554         /* try to shrink extent cache when there is no enough memory */
 555         if (!f2fs_available_free_memory(sbi, EXTENT_CACHE))
 556                 f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);
 557
 558         /* check the # of cached NAT entries */
 559         if (!f2fs_available_free_memory(sbi, NAT_ENTRIES))
 560                 f2fs_try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK);
 561
 562         if (!f2fs_available_free_memory(sbi, FREE_NIDS))
 563                 f2fs_try_to_free_nids(sbi, MAX_FREE_NIDS);
 564         else
 565                 f2fs_build_free_nids(sbi, false, false);
 566
 567         if (excess_dirty_nats(sbi) || excess_dirty_threshold(sbi) ||
 568                 excess_prefree_segs(sbi) || !f2fs_space_for_roll_forward(sbi))
 569                 goto do_sync;
 570
 571         /* there is background inflight IO or foreground operation recently */
 572         if (is_inflight_io(sbi, REQ_TIME) ||
 573                 (!f2fs_time_over(sbi, REQ_TIME) && rwsem_is_locked(&sbi->cp_rwsem)))
 574                 return;
 575
 576         /* exceed periodical checkpoint timeout threshold */
 577         if (f2fs_time_over(sbi, CP_TIME))
 578                 goto do_sync;
 579
 580         /* checkpoint is the only way to shrink partial cached entries */
 581         if (f2fs_available_free_memory(sbi, NAT_ENTRIES) &&
 582                 f2fs_available_free_memory(sbi, INO_ENTRIES))
 583                 return;
 584
 585 do_sync:
 586         if (test_opt(sbi, DATA_FLUSH) && from_bg) {
 587                 struct blk_plug plug;
 588
 589                 mutex_lock(&sbi->flush_lock);
 590
 591                 blk_start_plug(&plug);
 592                 f2fs_sync_dirty_inodes(sbi, FILE_INODE);
 593                 blk_finish_plug(&plug);
 594
 595                 mutex_unlock(&sbi->flush_lock);
 596         }
 597         f2fs_sync_fs(sbi->sb, true);
 598         stat_inc_bg_cp_count(sbi->stat_info);
 599 }
 600
 601 static int __submit_flush_wait(struct f2fs_sb_info *sbi,
 602                                 struct block_device *bdev)
 603 {
 604         int ret = blkdev_issue_flush(bdev);
 605
 606         trace_f2fs_issue_flush(bdev, test_opt(sbi, NOBARRIER),
 607                                 test_opt(sbi, FLUSH_MERGE), ret);
 608         return ret;
 609 }
 610
 611 static int submit_flush_wait(struct f2fs_sb_info *sbi, nid_t ino)
 612 {
 613         int ret = 0;
 614         int i;
 615
 616         if (!f2fs_is_multi_device(sbi))
 617                 return __submit_flush_wait(sbi, sbi->sb->s_bdev);
 618
 619         for (i = 0; i < sbi->s_ndevs; i++) {
 620                 if (!f2fs_is_dirty_device(sbi, ino, i, FLUSH_INO))
 621                         continue;
 622                 ret = __submit_flush_wait(sbi, FDEV(i).bdev);
 623                 if (ret)
 624                         break;
 625         }
 626         return ret;
 627 }
 628
 629 static int issue_flush_thread(void *data)
 630 {
 631         struct f2fs_sb_info *sbi = data;
 632         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 633         wait_queue_head_t *q = &fcc->flush_wait_queue;
 634 repeat:
 635         if (kthread_should_stop())
 636                 return 0;
 637
 638         if (!llist_empty(&fcc->issue_list)) {
 639                 struct flush_cmd *cmd, *next;
 640                 int ret;
 641
 642                 fcc->dispatch_list = llist_del_all(&fcc->issue_list);
 643                 fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
 644
 645                 cmd = llist_entry(fcc->dispatch_list, struct flush_cmd, llnode);
 646
 647                 ret = submit_flush_wait(sbi, cmd->ino);
 648                 atomic_inc(&fcc->issued_flush);
 649
 650                 llist_for_each_entry_safe(cmd, next,
 651                                           fcc->dispatch_list, llnode) {
 652                         cmd->ret = ret;
 653                         complete(&cmd->wait);
 654                 }
 655                 fcc->dispatch_list = NULL;
 656         }
 657
 658         wait_event_interruptible(*q,
 659                 kthread_should_stop() || !llist_empty(&fcc->issue_list));
 660         goto repeat;
 661 }
 662
 663 int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino)
 664 {
 665         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 666         struct flush_cmd cmd;
 667         int ret;
 668
 669         if (test_opt(sbi, NOBARRIER))
 670                 return 0;
 671
 672         if (!test_opt(sbi, FLUSH_MERGE)) {
 673                 atomic_inc(&fcc->queued_flush);
 674                 ret = submit_flush_wait(sbi, ino);
 675                 atomic_dec(&fcc->queued_flush);
 676                 atomic_inc(&fcc->issued_flush);
 677                 return ret;
 678         }
 679
 680         if (atomic_inc_return(&fcc->queued_flush) == 1 ||
 681             f2fs_is_multi_device(sbi)) {
 682                 ret = submit_flush_wait(sbi, ino);
 683                 atomic_dec(&fcc->queued_flush);
 684
 685                 atomic_inc(&fcc->issued_flush);
 686                 return ret;
 687         }
 688
 689         cmd.ino = ino;
 690         init_completion(&cmd.wait);
 691
 692         llist_add(&cmd.llnode, &fcc->issue_list);
 693
 694         /*
 695          * update issue_list before we wake up issue_flush thread, this
 696          * smp_mb() pairs with another barrier in ___wait_event(), see
 697          * more details in comments of waitqueue_active().
 698          */
 699         smp_mb();
 700
 701         if (waitqueue_active(&fcc->flush_wait_queue))
 702                 wake_up(&fcc->flush_wait_queue);
 703
 704         if (fcc->f2fs_issue_flush) {
 705                 wait_for_completion(&cmd.wait);
 706                 atomic_dec(&fcc->queued_flush);
 707         } else {
 708                 struct llist_node *list;
 709
 710                 list = llist_del_all(&fcc->issue_list);
 711                 if (!list) {
 712                         wait_for_completion(&cmd.wait);
 713                         atomic_dec(&fcc->queued_flush);
 714                 } else {
 715                         struct flush_cmd *tmp, *next;
 716
 717                         ret = submit_flush_wait(sbi, ino);
 718
 719                         llist_for_each_entry_safe(tmp, next, list, llnode) {
 720                                 if (tmp == &cmd) {
 721                                         cmd.ret = ret;
 722                                         atomic_dec(&fcc->queued_flush);
 723                                         continue;
 724                                 }
 725                                 tmp->ret = ret;
 726                                 complete(&tmp->wait);
 727                         }
 728                 }
 729         }
 730
 731         return cmd.ret;
 732 }
 733
 734 int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
 735 {
 736         dev_t dev = sbi->sb->s_bdev->bd_dev;
 737         struct flush_cmd_control *fcc;
 738         int err = 0;
 739
 740         if (SM_I(sbi)->fcc_info) {
 741                 fcc = SM_I(sbi)->fcc_info;
 742                 if (fcc->f2fs_issue_flush)
 743                         return err;
 744                 goto init_thread;
 745         }
 746
 747         fcc = f2fs_kzalloc(sbi, sizeof(struct flush_cmd_control), GFP_KERNEL);
 748         if (!fcc)
 749                 return -ENOMEM;
 750         atomic_set(&fcc->issued_flush, 0);
 751         atomic_set(&fcc->queued_flush, 0);
 752         init_waitqueue_head(&fcc->flush_wait_queue);
 753         init_llist_head(&fcc->issue_list);
 754         SM_I(sbi)->fcc_info = fcc;
 755         if (!test_opt(sbi, FLUSH_MERGE))
 756                 return err;
 757
 758 init_thread:
 759         fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
 760                                 "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
 761         if (IS_ERR(fcc->f2fs_issue_flush)) {
 762                 err = PTR_ERR(fcc->f2fs_issue_flush);
 763                 kfree(fcc);
 764                 SM_I(sbi)->fcc_info = NULL;
 765                 return err;
 766         }
 767
 768         return err;
 769 }
 770
 771 void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
 772 {
 773         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 774
 775         if (fcc && fcc->f2fs_issue_flush) {
 776                 struct task_struct *flush_thread = fcc->f2fs_issue_flush;
 777
 778                 fcc->f2fs_issue_flush = NULL;
 779                 kthread_stop(flush_thread);
 780         }
 781         if (free) {
 782                 kfree(fcc);
 783                 SM_I(sbi)->fcc_info = NULL;
 784         }
 785 }
 786
 787 int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
 788 {
 789         int ret = 0, i;
 790
 791         if (!f2fs_is_multi_device(sbi))
 792                 return 0;
 793
 794         if (test_opt(sbi, NOBARRIER))
 795                 return 0;
 796
 797         for (i = 1; i < sbi->s_ndevs; i++) {
 798                 int count = DEFAULT_RETRY_IO_COUNT;
 799
 800                 if (!f2fs_test_bit(i, (char *)&sbi->dirty_device))
 801                         continue;
 802
 803                 do {
 804                         ret = __submit_flush_wait(sbi, FDEV(i).bdev);
 805                         if (ret)
 806                                 congestion_wait(BLK_RW_ASYNC,
 807                                                 DEFAULT_IO_TIMEOUT);
 808                 } while (ret && --count);
 809
 810                 if (ret) {
 811                         f2fs_stop_checkpoint(sbi, false);
 812                         break;
 813                 }
 814
 815                 spin_lock(&sbi->dev_lock);
 816                 f2fs_clear_bit(i, (char *)&sbi->dirty_device);
 817                 spin_unlock(&sbi->dev_lock);
 818         }
 819
 820         return ret;
 821 }
 822
 823 static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 824                 enum dirty_type dirty_type)
 825 {
 826         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 827
 828         /* need not be added */
 829         if (IS_CURSEG(sbi, segno))
 830                 return;
 831
 832         if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 833                 dirty_i->nr_dirty[dirty_type]++;
 834
 835         if (dirty_type == DIRTY) {
 836                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 837                 enum dirty_type t = sentry->type;
 838
 839                 if (unlikely(t >= DIRTY)) {
 840                         f2fs_bug_on(sbi, 1);
 841                         return;
 842                 }
 843                 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
 844                         dirty_i->nr_dirty[t]++;
 845
 846                 if (__is_large_section(sbi)) {
 847                         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 848                         block_t valid_blocks =
 849                                 get_valid_blocks(sbi, segno, true);
 850
 851                         f2fs_bug_on(sbi, unlikely(!valid_blocks ||
 852                                         valid_blocks == BLKS_PER_SEC(sbi)));
 853
 854                         if (!IS_CURSEC(sbi, secno))
 855                                 set_bit(secno, dirty_i->dirty_secmap);
 856                 }
 857         }
 858 }
 859
 860 static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 861                 enum dirty_type dirty_type)
 862 {
 863         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 864         block_t valid_blocks;
 865
 866         if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 867                 dirty_i->nr_dirty[dirty_type]--;
 868
 869         if (dirty_type == DIRTY) {
 870                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 871                 enum dirty_type t = sentry->type;
 872
 873                 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
 874                         dirty_i->nr_dirty[t]--;
 875
 876                 valid_blocks = get_valid_blocks(sbi, segno, true);
 877                 if (valid_blocks == 0) {
 878                         clear_bit(GET_SEC_FROM_SEG(sbi, segno),
 879                                                 dirty_i->victim_secmap);
 880 #ifdef CONFIG_F2FS_CHECK_FS
 881                         clear_bit(segno, SIT_I(sbi)->invalid_segmap);
 882 #endif
 883                 }
 884                 if (__is_large_section(sbi)) {
 885                         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 886
 887                         if (!valid_blocks ||
 888                                         valid_blocks == BLKS_PER_SEC(sbi)) {
 889                                 clear_bit(secno, dirty_i->dirty_secmap);
 890                                 return;
 891                         }
 892
 893                         if (!IS_CURSEC(sbi, secno))
 894                                 set_bit(secno, dirty_i->dirty_secmap);
 895                 }
 896         }
 897 }
 898
 899 /*
 900  * Should not occur error such as -ENOMEM.
 901  * Adding dirty entry into seglist is not critical operation.
 902  * If a given segment is one of current working segments, it won't be added.
 903  */
 904 static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 905 {
 906         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 907         unsigned short valid_blocks, ckpt_valid_blocks;
 908         unsigned int usable_blocks;
 909
 910         if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
 911                 return;
 912
 913         usable_blocks = f2fs_usable_blks_in_seg(sbi, segno);
 914         mutex_lock(&dirty_i->seglist_lock);
 915
 916         valid_blocks = get_valid_blocks(sbi, segno, false);
 917         ckpt_valid_blocks = get_ckpt_valid_blocks(sbi, segno, false);
 918
 919         if (valid_blocks == 0 && (!is_sbi_flag_set(sbi, SBI_CP_DISABLED) ||
 920                 ckpt_valid_blocks == usable_blocks)) {
 921                 __locate_dirty_segment(sbi, segno, PRE);
 922                 __remove_dirty_segment(sbi, segno, DIRTY);
 923         } else if (valid_blocks < usable_blocks) {
 924                 __locate_dirty_segment(sbi, segno, DIRTY);
 925         } else {
 926                 /* Recovery routine with SSR needs this */
 927                 __remove_dirty_segment(sbi, segno, DIRTY);
 928         }
 929
 930         mutex_unlock(&dirty_i->seglist_lock);
 931 }
 932
 933 /* This moves currently empty dirty blocks to prefree. Must hold seglist_lock */
 934 void f2fs_dirty_to_prefree(struct f2fs_sb_info *sbi)
 935 {
 936         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 937         unsigned int segno;
 938
 939         mutex_lock(&dirty_i->seglist_lock);
 940         for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
 941                 if (get_valid_blocks(sbi, segno, false))
 942                         continue;
 943                 if (IS_CURSEG(sbi, segno))
 944                         continue;
 945                 __locate_dirty_segment(sbi, segno, PRE);
 946                 __remove_dirty_segment(sbi, segno, DIRTY);
 947         }
 948         mutex_unlock(&dirty_i->seglist_lock);
 949 }
 950
 951 block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi)
 952 {
 953         int ovp_hole_segs =
 954                 (overprovision_segments(sbi) - reserved_segments(sbi));
 955         block_t ovp_holes = ovp_hole_segs << sbi->log_blocks_per_seg;
 956         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 957         block_t holes[2] = {0, 0};      /* DATA and NODE */
 958         block_t unusable;
 959         struct seg_entry *se;
 960         unsigned int segno;
 961
 962         mutex_lock(&dirty_i->seglist_lock);
 963         for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
 964                 se = get_seg_entry(sbi, segno);
 965                 if (IS_NODESEG(se->type))
 966                         holes[NODE] += f2fs_usable_blks_in_seg(sbi, segno) -
 967                                                         se->valid_blocks;
 968                 else
 969                         holes[DATA] += f2fs_usable_blks_in_seg(sbi, segno) -
 970                                                         se->valid_blocks;
 971         }
 972         mutex_unlock(&dirty_i->seglist_lock);
 973
 974         unusable = holes[DATA] > holes[NODE] ? holes[DATA] : holes[NODE];
 975         if (unusable > ovp_holes)
 976                 return unusable - ovp_holes;
 977         return 0;
 978 }
 979
 980 int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable)
 981 {
 982         int ovp_hole_segs =
 983                 (overprovision_segments(sbi) - reserved_segments(sbi));
 984         if (unusable > F2FS_OPTION(sbi).unusable_cap)
 985                 return -EAGAIN;
 986         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK) &&
 987                 dirty_segments(sbi) > ovp_hole_segs)
 988                 return -EAGAIN;
 989         return 0;
 990 }
 991
 992 /* This is only used by SBI_CP_DISABLED */
 993 static unsigned int get_free_segment(struct f2fs_sb_info *sbi)
 994 {
 995         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 996         unsigned int segno = 0;
 997
 998         mutex_lock(&dirty_i->seglist_lock);
 999         for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
1000                 if (get_valid_blocks(sbi, segno, false))
1001                         continue;
1002                 if (get_ckpt_valid_blocks(sbi, segno, false))
1003                         continue;
1004                 mutex_unlock(&dirty_i->seglist_lock);
1005                 return segno;
1006         }
1007         mutex_unlock(&dirty_i->seglist_lock);
1008         return NULL_SEGNO;
1009 }
1010
1011 static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
1012                 struct block_device *bdev, block_t lstart,
1013                 block_t start, block_t len)
1014 {
1015         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1016         struct list_head *pend_list;
1017         struct discard_cmd *dc;
1018
1019         f2fs_bug_on(sbi, !len);
1020
1021         pend_list = &dcc->pend_list[plist_idx(len)];
1022
1023         dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS, true, NULL);
1024         INIT_LIST_HEAD(&dc->list);
1025         dc->bdev = bdev;
1026         dc->lstart = lstart;
1027         dc->start = start;
1028         dc->len = len;
1029         dc->ref = 0;
1030         dc->state = D_PREP;
1031         dc->queued = 0;
1032         dc->error = 0;
1033         init_completion(&dc->wait);
1034         list_add_tail(&dc->list, pend_list);
1035         spin_lock_init(&dc->lock);
1036         dc->bio_ref = 0;
1037         atomic_inc(&dcc->discard_cmd_cnt);
1038         dcc->undiscard_blks += len;
1039
1040         return dc;
1041 }
1042
1043 static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
1044                                 struct block_device *bdev, block_t lstart,
1045                                 block_t start, block_t len,
1046                                 struct rb_node *parent, struct rb_node **p,
1047                                 bool leftmost)
1048 {
1049         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1050         struct discard_cmd *dc;
1051
1052         dc = __create_discard_cmd(sbi, bdev, lstart, start, len);
1053
1054         rb_link_node(&dc->rb_node, parent, p);
1055         rb_insert_color_cached(&dc->rb_node, &dcc->root, leftmost);
1056
1057         return dc;
1058 }
1059
1060 static void __detach_discard_cmd(struct discard_cmd_control *dcc,
1061                                                         struct discard_cmd *dc)
1062 {
1063         if (dc->state == D_DONE)
1064                 atomic_sub(dc->queued, &dcc->queued_discard);
1065
1066         list_del(&dc->list);
1067         rb_erase_cached(&dc->rb_node, &dcc->root);
1068         dcc->undiscard_blks -= dc->len;
1069
1070         kmem_cache_free(discard_cmd_slab, dc);
1071
1072         atomic_dec(&dcc->discard_cmd_cnt);
1073 }
1074
1075 static void __remove_discard_cmd(struct f2fs_sb_info *sbi,
1076                                                         struct discard_cmd *dc)
1077 {
1078         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1079         unsigned long flags;
1080
1081         trace_f2fs_remove_discard(dc->bdev, dc->start, dc->len);
1082
1083         spin_lock_irqsave(&dc->lock, flags);
1084         if (dc->bio_ref) {
1085                 spin_unlock_irqrestore(&dc->lock, flags);
1086                 return;
1087         }
1088         spin_unlock_irqrestore(&dc->lock, flags);
1089
1090         f2fs_bug_on(sbi, dc->ref);
1091
1092         if (dc->error == -EOPNOTSUPP)
1093                 dc->error = 0;
1094
1095         if (dc->error)
1096                 printk_ratelimited(
1097                         "%sF2FS-fs (%s): Issue discard(%u, %u, %u) failed, ret: %d",
1098                         KERN_INFO, sbi->sb->s_id,
1099                         dc->lstart, dc->start, dc->len, dc->error);
1100         __detach_discard_cmd(dcc, dc);
1101 }
1102
1103 static void f2fs_submit_discard_endio(struct bio *bio)
1104 {
1105         struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
1106         unsigned long flags;
1107
1108         spin_lock_irqsave(&dc->lock, flags);
1109         if (!dc->error)
1110                 dc->error = blk_status_to_errno(bio->bi_status);
1111         dc->bio_ref--;
1112         if (!dc->bio_ref && dc->state == D_SUBMIT) {
1113                 dc->state = D_DONE;
1114                 complete_all(&dc->wait);
1115         }
1116         spin_unlock_irqrestore(&dc->lock, flags);
1117         bio_put(bio);
1118 }
1119
1120 static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
1121                                 block_t start, block_t end)
1122 {
1123 #ifdef CONFIG_F2FS_CHECK_FS
1124         struct seg_entry *sentry;
1125         unsigned int segno;
1126         block_t blk = start;
1127         unsigned long offset, size, max_blocks = sbi->blocks_per_seg;
1128         unsigned long *map;
1129
1130         while (blk < end) {
1131                 segno = GET_SEGNO(sbi, blk);
1132                 sentry = get_seg_entry(sbi, segno);
1133                 offset = GET_BLKOFF_FROM_SEG0(sbi, blk);
1134
1135                 if (end < START_BLOCK(sbi, segno + 1))
1136                         size = GET_BLKOFF_FROM_SEG0(sbi, end);
1137                 else
1138                         size = max_blocks;
1139                 map = (unsigned long *)(sentry->cur_valid_map);
1140                 offset = __find_rev_next_bit(map, size, offset);
1141                 f2fs_bug_on(sbi, offset != size);
1142                 blk = START_BLOCK(sbi, segno + 1);
1143         }
1144 #endif
1145 }
1146
1147 static void __init_discard_policy(struct f2fs_sb_info *sbi,
1148                                 struct discard_policy *dpolicy,
1149                                 int discard_type, unsigned int granularity)
1150 {
1151         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1152
1153         /* common policy */
1154         dpolicy->type = discard_type;
1155         dpolicy->sync = true;
1156         dpolicy->ordered = false;
1157         dpolicy->granularity = granularity;
1158
1159         dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
1160         dpolicy->io_aware_gran = MAX_PLIST_NUM;
1161         dpolicy->timeout = false;
1162
1163         if (discard_type == DPOLICY_BG) {
1164                 dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
1165                 dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
1166                 dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
1167                 dpolicy->io_aware = true;
1168                 dpolicy->sync = false;
1169                 dpolicy->ordered = true;
1170                 if (utilization(sbi) > DEF_DISCARD_URGENT_UTIL) {
1171                         dpolicy->granularity = 1;
1172                         if (atomic_read(&dcc->discard_cmd_cnt))
1173                                 dpolicy->max_interval =
1174                                         DEF_MIN_DISCARD_ISSUE_TIME;
1175                 }
1176         } else if (discard_type == DPOLICY_FORCE) {
1177                 dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
1178                 dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
1179                 dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
1180                 dpolicy->io_aware = false;
1181         } else if (discard_type == DPOLICY_FSTRIM) {
1182                 dpolicy->io_aware = false;
1183         } else if (discard_type == DPOLICY_UMOUNT) {
1184                 dpolicy->io_aware = false;
1185                 /* we need to issue all to keep CP_TRIMMED_FLAG */
1186                 dpolicy->granularity = 1;
1187                 dpolicy->timeout = true;
1188         }
1189 }
1190
1191 static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
1192                                 struct block_device *bdev, block_t lstart,
1193                                 block_t start, block_t len);
1194 /* this function is copied from blkdev_issue_discard from block/blk-lib.c */
1195 static int __submit_discard_cmd(struct f2fs_sb_info *sbi,
1196                                                 struct discard_policy *dpolicy,
1197                                                 struct discard_cmd *dc,
1198                                                 unsigned int *issued)
1199 {
1200         struct block_device *bdev = dc->bdev;
1201         struct request_queue *q = bdev_get_queue(bdev);
1202         unsigned int max_discard_blocks =
1203                         SECTOR_TO_BLOCK(q->limits.max_discard_sectors);
1204         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1205         struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
1206                                         &(dcc->fstrim_list) : &(dcc->wait_list);
1207         int flag = dpolicy->sync ? REQ_SYNC : 0;
1208         block_t lstart, start, len, total_len;
1209         int err = 0;
1210
1211         if (dc->state != D_PREP)
1212                 return 0;
1213
1214         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1215                 return 0;
1216
1217         trace_f2fs_issue_discard(bdev, dc->start, dc->len);
1218
1219         lstart = dc->lstart;
1220         start = dc->start;
1221         len = dc->len;
1222         total_len = len;
1223
1224         dc->len = 0;
1225
1226         while (total_len && *issued < dpolicy->max_requests && !err) {
1227                 struct bio *bio = NULL;
1228                 unsigned long flags;
1229                 bool last = true;
1230
1231                 if (len > max_discard_blocks) {
1232                         len = max_discard_blocks;
1233                         last = false;
1234                 }
1235
1236                 (*issued)++;
1237                 if (*issued == dpolicy->max_requests)
1238                         last = true;
1239
1240                 dc->len += len;
1241
1242                 if (time_to_inject(sbi, FAULT_DISCARD)) {
1243                         f2fs_show_injection_info(sbi, FAULT_DISCARD);
1244                         err = -EIO;
1245                         goto submit;
1246                 }
1247                 err = __blkdev_issue_discard(bdev,
1248                                         SECTOR_FROM_BLOCK(start),
1249                                         SECTOR_FROM_BLOCK(len),
1250                                         GFP_NOFS, 0, &bio);
1251 submit:
1252                 if (err) {
1253                         spin_lock_irqsave(&dc->lock, flags);
1254                         if (dc->state == D_PARTIAL)
1255                                 dc->state = D_SUBMIT;
1256                         spin_unlock_irqrestore(&dc->lock, flags);
1257
1258                         break;
1259                 }
1260
1261                 f2fs_bug_on(sbi, !bio);
1262
1263                 /*
1264                  * should keep before submission to avoid D_DONE
1265                  * right away
1266                  */
1267                 spin_lock_irqsave(&dc->lock, flags);
1268                 if (last)
1269                         dc->state = D_SUBMIT;
1270                 else
1271                         dc->state = D_PARTIAL;
1272                 dc->bio_ref++;
1273                 spin_unlock_irqrestore(&dc->lock, flags);
1274
1275                 atomic_inc(&dcc->queued_discard);
1276                 dc->queued++;
1277                 list_move_tail(&dc->list, wait_list);
1278
1279                 /* sanity check on discard range */
1280                 __check_sit_bitmap(sbi, lstart, lstart + len);
1281
1282                 bio->bi_private = dc;
1283                 bio->bi_end_io = f2fs_submit_discard_endio;
1284                 bio->bi_opf |= flag;
1285                 submit_bio(bio);
1286
1287                 atomic_inc(&dcc->issued_discard);
1288
1289                 f2fs_update_iostat(sbi, FS_DISCARD, 1);
1290
1291                 lstart += len;
1292                 start += len;
1293                 total_len -= len;
1294                 len = total_len;
1295         }
1296
1297         if (!err && len) {
1298                 dcc->undiscard_blks -= len;
1299                 __update_discard_tree_range(sbi, bdev, lstart, start, len);
1300         }
1301         return err;
1302 }
1303
1304 static void __insert_discard_tree(struct f2fs_sb_info *sbi,
1305                                 struct block_device *bdev, block_t lstart,
1306                                 block_t start, block_t len,
1307                                 struct rb_node **insert_p,
1308                                 struct rb_node *insert_parent)
1309 {
1310         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1311         struct rb_node **p;
1312         struct rb_node *parent = NULL;
1313         bool leftmost = true;
1314
1315         if (insert_p && insert_parent) {
1316                 parent = insert_parent;
1317                 p = insert_p;
1318                 goto do_insert;
1319         }
1320
1321         p = f2fs_lookup_rb_tree_for_insert(sbi, &dcc->root, &parent,
1322                                                         lstart, &leftmost);
1323 do_insert:
1324         __attach_discard_cmd(sbi, bdev, lstart, start, len, parent,
1325                                                                 p, leftmost);
1326 }
1327
1328 static void __relocate_discard_cmd(struct discard_cmd_control *dcc,
1329                                                 struct discard_cmd *dc)
1330 {
1331         list_move_tail(&dc->list, &dcc->pend_list[plist_idx(dc->len)]);
1332 }
1333
1334 static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
1335                                 struct discard_cmd *dc, block_t blkaddr)
1336 {
1337         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1338         struct discard_info di = dc->di;
1339         bool modified = false;
1340
1341         if (dc->state == D_DONE || dc->len == 1) {
1342                 __remove_discard_cmd(sbi, dc);
1343                 return;
1344         }
1345
1346         dcc->undiscard_blks -= di.len;
1347
1348         if (blkaddr > di.lstart) {
1349                 dc->len = blkaddr - dc->lstart;
1350                 dcc->undiscard_blks += dc->len;
1351                 __relocate_discard_cmd(dcc, dc);
1352                 modified = true;
1353         }
1354
1355         if (blkaddr < di.lstart + di.len - 1) {
1356                 if (modified) {
1357                         __insert_discard_tree(sbi, dc->bdev, blkaddr + 1,
1358                                         di.start + blkaddr + 1 - di.lstart,
1359                                         di.lstart + di.len - 1 - blkaddr,
1360                                         NULL, NULL);
1361                 } else {
1362                         dc->lstart++;
1363                         dc->len--;
1364                         dc->start++;
1365                         dcc->undiscard_blks += dc->len;
1366                         __relocate_discard_cmd(dcc, dc);
1367                 }
1368         }
1369 }
1370
1371 static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
1372                                 struct block_device *bdev, block_t lstart,
1373                                 block_t start, block_t len)
1374 {
1375         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1376         struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
1377         struct discard_cmd *dc;
1378         struct discard_info di = {0};
1379         struct rb_node **insert_p = NULL, *insert_parent = NULL;
1380         struct request_queue *q = bdev_get_queue(bdev);
1381         unsigned int max_discard_blocks =
1382                         SECTOR_TO_BLOCK(q->limits.max_discard_sectors);
1383         block_t end = lstart + len;
1384
1385         dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
1386                                         NULL, lstart,
1387                                         (struct rb_entry **)&prev_dc,
1388                                         (struct rb_entry **)&next_dc,
1389                                         &insert_p, &insert_parent, true, NULL);
1390         if (dc)
1391                 prev_dc = dc;
1392
1393         if (!prev_dc) {
1394                 di.lstart = lstart;
1395                 di.len = next_dc ? next_dc->lstart - lstart : len;
1396                 di.len = min(di.len, len);
1397                 di.start = start;
1398         }
1399
1400         while (1) {
1401                 struct rb_node *node;
1402                 bool merged = false;
1403                 struct discard_cmd *tdc = NULL;
1404
1405                 if (prev_dc) {
1406                         di.lstart = prev_dc->lstart + prev_dc->len;
1407                         if (di.lstart < lstart)
1408                                 di.lstart = lstart;
1409                         if (di.lstart >= end)
1410                                 break;
1411
1412                         if (!next_dc || next_dc->lstart > end)
1413                                 di.len = end - di.lstart;
1414                         else
1415                                 di.len = next_dc->lstart - di.lstart;
1416                         di.start = start + di.lstart - lstart;
1417                 }
1418
1419                 if (!di.len)
1420                         goto next;
1421
1422                 if (prev_dc && prev_dc->state == D_PREP &&
1423                         prev_dc->bdev == bdev &&
1424                         __is_discard_back_mergeable(&di, &prev_dc->di,
1425                                                         max_discard_blocks)) {
1426                         prev_dc->di.len += di.len;
1427                         dcc->undiscard_blks += di.len;
1428                         __relocate_discard_cmd(dcc, prev_dc);
1429                         di = prev_dc->di;
1430                         tdc = prev_dc;
1431                         merged = true;
1432                 }
1433
1434                 if (next_dc && next_dc->state == D_PREP &&
1435                         next_dc->bdev == bdev &&
1436                         __is_discard_front_mergeable(&di, &next_dc->di,
1437                                                         max_discard_blocks)) {
1438                         next_dc->di.lstart = di.lstart;
1439                         next_dc->di.len += di.len;
1440                         next_dc->di.start = di.start;
1441                         dcc->undiscard_blks += di.len;
1442                         __relocate_discard_cmd(dcc, next_dc);
1443                         if (tdc)
1444                                 __remove_discard_cmd(sbi, tdc);
1445                         merged = true;
1446                 }
1447
1448                 if (!merged) {
1449                         __insert_discard_tree(sbi, bdev, di.lstart, di.start,
1450                                                         di.len, NULL, NULL);
1451                 }
1452  next:
1453                 prev_dc = next_dc;
1454                 if (!prev_dc)
1455                         break;
1456
1457                 node = rb_next(&prev_dc->rb_node);
1458                 next_dc = rb_entry_safe(node, struct discard_cmd, rb_node);
1459         }
1460 }
1461
1462 static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
1463                 struct block_device *bdev, block_t blkstart, block_t blklen)
1464 {
1465         block_t lblkstart = blkstart;
1466
1467         if (!f2fs_bdev_support_discard(bdev))
1468                 return 0;
1469
1470         trace_f2fs_queue_discard(bdev, blkstart, blklen);
1471
1472         if (f2fs_is_multi_device(sbi)) {
1473                 int devi = f2fs_target_device_index(sbi, blkstart);
1474
1475                 blkstart -= FDEV(devi).start_blk;
1476         }
1477         mutex_lock(&SM_I(sbi)->dcc_info->cmd_lock);
1478         __update_discard_tree_range(sbi, bdev, lblkstart, blkstart, blklen);
1479         mutex_unlock(&SM_I(sbi)->dcc_info->cmd_lock);
1480         return 0;
1481 }
1482
1483 static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
1484                                         struct discard_policy *dpolicy)
1485 {
1486         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1487         struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
1488         struct rb_node **insert_p = NULL, *insert_parent = NULL;
1489         struct discard_cmd *dc;
1490         struct blk_plug plug;
1491         unsigned int pos = dcc->next_pos;
1492         unsigned int issued = 0;
1493         bool io_interrupted = false;
1494
1495         mutex_lock(&dcc->cmd_lock);
1496         dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
1497                                         NULL, pos,
1498                                         (struct rb_entry **)&prev_dc,
1499                                         (struct rb_entry **)&next_dc,
1500                                         &insert_p, &insert_parent, true, NULL);
1501         if (!dc)
1502                 dc = next_dc;
1503
1504         blk_start_plug(&plug);
1505
1506         while (dc) {
1507                 struct rb_node *node;
1508                 int err = 0;
1509
1510                 if (dc->state != D_PREP)
1511                         goto next;
1512
1513                 if (dpolicy->io_aware && !is_idle(sbi, DISCARD_TIME)) {
1514                         io_interrupted = true;
1515                         break;
1516                 }
1517
1518                 dcc->next_pos = dc->lstart + dc->len;
1519                 err = __submit_discard_cmd(sbi, dpolicy, dc, &issued);
1520
1521                 if (issued >= dpolicy->max_requests)
1522                         break;
1523 next:
1524                 node = rb_next(&dc->rb_node);
1525                 if (err)
1526                         __remove_discard_cmd(sbi, dc);
1527                 dc = rb_entry_safe(node, struct discard_cmd, rb_node);
1528         }
1529
1530         blk_finish_plug(&plug);
1531
1532         if (!dc)
1533                 dcc->next_pos = 0;
1534
1535         mutex_unlock(&dcc->cmd_lock);
1536
1537         if (!issued && io_interrupted)
1538                 issued = -1;
1539
1540         return issued;
1541 }
1542 static unsigned int __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
1543                                         struct discard_policy *dpolicy);
1544
1545 static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
1546                                         struct discard_policy *dpolicy)
1547 {
1548         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1549         struct list_head *pend_list;
1550         struct discard_cmd *dc, *tmp;
1551         struct blk_plug plug;
1552         int i, issued;
1553         bool io_interrupted = false;
1554
1555         if (dpolicy->timeout)
1556                 f2fs_update_time(sbi, UMOUNT_DISCARD_TIMEOUT);
1557
1558 retry:
1559         issued = 0;
1560         for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
1561                 if (dpolicy->timeout &&
1562                                 f2fs_time_over(sbi, UMOUNT_DISCARD_TIMEOUT))
1563                         break;
1564
1565                 if (i + 1 < dpolicy->granularity)
1566                         break;
1567
1568                 if (i < DEFAULT_DISCARD_GRANULARITY && dpolicy->ordered)
1569                         return __issue_discard_cmd_orderly(sbi, dpolicy);
1570
1571                 pend_list = &dcc->pend_list[i];
1572
1573                 mutex_lock(&dcc->cmd_lock);
1574                 if (list_empty(pend_list))
1575                         goto next;
1576                 if (unlikely(dcc->rbtree_check))
1577                         f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
1578                                                         &dcc->root, false));
1579                 blk_start_plug(&plug);
1580                 list_for_each_entry_safe(dc, tmp, pend_list, list) {
1581                         f2fs_bug_on(sbi, dc->state != D_PREP);
1582
1583                         if (dpolicy->timeout &&
1584                                 f2fs_time_over(sbi, UMOUNT_DISCARD_TIMEOUT))
1585                                 break;
1586
1587                         if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
1588                                                 !is_idle(sbi, DISCARD_TIME)) {
1589                                 io_interrupted = true;
1590                                 break;
1591                         }
1592
1593                         __submit_discard_cmd(sbi, dpolicy, dc, &issued);
1594
1595                         if (issued >= dpolicy->max_requests)
1596                                 break;
1597                 }
1598                 blk_finish_plug(&plug);
1599 next:
1600                 mutex_unlock(&dcc->cmd_lock);
1601
1602                 if (issued >= dpolicy->max_requests || io_interrupted)
1603                         break;
1604         }
1605
1606         if (dpolicy->type == DPOLICY_UMOUNT && issued) {
1607                 __wait_all_discard_cmd(sbi, dpolicy);
1608                 goto retry;
1609         }
1610
1611         if (!issued && io_interrupted)
1612                 issued = -1;
1613
1614         return issued;
1615 }
1616
1617 static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
1618 {
1619         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1620         struct list_head *pend_list;
1621         struct discard_cmd *dc, *tmp;
1622         int i;
1623         bool dropped = false;
1624
1625         mutex_lock(&dcc->cmd_lock);
1626         for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
1627                 pend_list = &dcc->pend_list[i];
1628                 list_for_each_entry_safe(dc, tmp, pend_list, list) {
1629                         f2fs_bug_on(sbi, dc->state != D_PREP);
1630                         __remove_discard_cmd(sbi, dc);
1631                         dropped = true;
1632                 }
1633         }
1634         mutex_unlock(&dcc->cmd_lock);
1635
1636         return dropped;
1637 }
1638
1639 void f2fs_drop_discard_cmd(struct f2fs_sb_info *sbi)
1640 {
1641         __drop_discard_cmd(sbi);
1642 }
1643
1644 static unsigned int __wait_one_discard_bio(struct f2fs_sb_info *sbi,
1645                                                         struct discard_cmd *dc)
1646 {
1647         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1648         unsigned int len = 0;
1649
1650         wait_for_completion_io(&dc->wait);
1651         mutex_lock(&dcc->cmd_lock);
1652         f2fs_bug_on(sbi, dc->state != D_DONE);
1653         dc->ref--;
1654         if (!dc->ref) {
1655                 if (!dc->error)
1656                         len = dc->len;
1657                 __remove_discard_cmd(sbi, dc);
1658         }
1659         mutex_unlock(&dcc->cmd_lock);
1660
1661         return len;
1662 }
1663
1664 static unsigned int __wait_discard_cmd_range(struct f2fs_sb_info *sbi,
1665                                                 struct discard_policy *dpolicy,
1666                                                 block_t start, block_t end)
1667 {
1668         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1669         struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
1670                                         &(dcc->fstrim_list) : &(dcc->wait_list);
1671         struct discard_cmd *dc, *tmp;
1672         bool need_wait;
1673         unsigned int trimmed = 0;
1674
1675 next:
1676         need_wait = false;
1677
1678         mutex_lock(&dcc->cmd_lock);
1679         list_for_each_entry_safe(dc, tmp, wait_list, list) {
1680                 if (dc->lstart + dc->len <= start || end <= dc->lstart)
1681                         continue;
1682                 if (dc->len < dpolicy->granularity)
1683                         continue;
1684                 if (dc->state == D_DONE && !dc->ref) {
1685                         wait_for_completion_io(&dc->wait);
1686                         if (!dc->error)
1687                                 trimmed += dc->len;
1688                         __remove_discard_cmd(sbi, dc);
1689                 } else {
1690                         dc->ref++;
1691                         need_wait = true;
1692                         break;
1693                 }
1694         }
1695         mutex_unlock(&dcc->cmd_lock);
1696
1697         if (need_wait) {
1698                 trimmed += __wait_one_discard_bio(sbi, dc);
1699                 goto next;
1700         }
1701
1702         return trimmed;
1703 }
1704
1705 static unsigned int __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
1706                                                 struct discard_policy *dpolicy)
1707 {
1708         struct discard_policy dp;
1709         unsigned int discard_blks;
1710
1711         if (dpolicy)
1712                 return __wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
1713
1714         /* wait all */
1715         __init_discard_policy(sbi, &dp, DPOLICY_FSTRIM, 1);
1716         discard_blks = __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
1717         __init_discard_policy(sbi, &dp, DPOLICY_UMOUNT, 1);
1718         discard_blks += __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
1719
1720         return discard_blks;
1721 }
1722
1723 /* This should be covered by global mutex, &sit_i->sentry_lock */
1724 static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
1725 {
1726         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1727         struct discard_cmd *dc;
1728         bool need_wait = false;
1729
1730         mutex_lock(&dcc->cmd_lock);
1731         dc = (struct discard_cmd *)f2fs_lookup_rb_tree(&dcc->root,
1732                                                         NULL, blkaddr);
1733         if (dc) {
1734                 if (dc->state == D_PREP) {
1735                         __punch_discard_cmd(sbi, dc, blkaddr);
1736                 } else {
1737                         dc->ref++;
1738                         need_wait = true;
1739                 }
1740         }
1741         mutex_unlock(&dcc->cmd_lock);
1742
1743         if (need_wait)
1744                 __wait_one_discard_bio(sbi, dc);
1745 }
1746
1747 void f2fs_stop_discard_thread(struct f2fs_sb_info *sbi)
1748 {
1749         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1750
1751         if (dcc && dcc->f2fs_issue_discard) {
1752                 struct task_struct *discard_thread = dcc->f2fs_issue_discard;
1753
1754                 dcc->f2fs_issue_discard = NULL;
1755                 kthread_stop(discard_thread);
1756         }
1757 }
1758
1759 /* This comes from f2fs_put_super */
1760 bool f2fs_issue_discard_timeout(struct f2fs_sb_info *sbi)
1761 {
1762         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1763         struct discard_policy dpolicy;
1764         bool dropped;
1765
1766         __init_discard_policy(sbi, &dpolicy, DPOLICY_UMOUNT,
1767                                         dcc->discard_granularity);
1768         __issue_discard_cmd(sbi, &dpolicy);
1769         dropped = __drop_discard_cmd(sbi);
1770
1771         /* just to make sure there is no pending discard commands */
1772         __wait_all_discard_cmd(sbi, NULL);
1773
1774         f2fs_bug_on(sbi, atomic_read(&dcc->discard_cmd_cnt));
1775         return dropped;
1776 }
1777
1778 static int issue_discard_thread(void *data)
1779 {
1780         struct f2fs_sb_info *sbi = data;
1781         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1782         wait_queue_head_t *q = &dcc->discard_wait_queue;
1783         struct discard_policy dpolicy;
1784         unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
1785         int issued;
1786
1787         set_freezable();
1788
1789         do {
1790                 if (sbi->gc_mode == GC_URGENT_HIGH ||
1791                         !f2fs_available_free_memory(sbi, DISCARD_CACHE))
1792                         __init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);
1793                 else
1794                         __init_discard_policy(sbi, &dpolicy, DPOLICY_BG,
1795                                                 dcc->discard_granularity);
1796
1797                 if (!atomic_read(&dcc->discard_cmd_cnt))
1798                        wait_ms = dpolicy.max_interval;
1799
1800                 wait_event_interruptible_timeout(*q,
1801                                 kthread_should_stop() || freezing(current) ||
1802                                 dcc->discard_wake,
1803                                 msecs_to_jiffies(wait_ms));
1804
1805                 if (dcc->discard_wake)
1806                         dcc->discard_wake = 0;
1807
1808                 /* clean up pending candidates before going to sleep */
1809                 if (atomic_read(&dcc->queued_discard))
1810                         __wait_all_discard_cmd(sbi, NULL);
1811
1812                 if (try_to_freeze())
1813                         continue;
1814                 if (f2fs_readonly(sbi->sb))
1815                         continue;
1816                 if (kthread_should_stop())
1817                         return 0;
1818                 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1819                         wait_ms = dpolicy.max_interval;
1820                         continue;
1821                 }
1822                 if (!atomic_read(&dcc->discard_cmd_cnt))
1823                         continue;
1824
1825                 sb_start_intwrite(sbi->sb);
1826
1827                 issued = __issue_discard_cmd(sbi, &dpolicy);
1828                 if (issued > 0) {
1829                         __wait_all_discard_cmd(sbi, &dpolicy);
1830                         wait_ms = dpolicy.min_interval;
1831                 } else if (issued == -1) {
1832                         wait_ms = f2fs_time_to_wait(sbi, DISCARD_TIME);
1833                         if (!wait_ms)
1834                                 wait_ms = dpolicy.mid_interval;
1835                 } else {
1836                         wait_ms = dpolicy.max_interval;
1837                 }
1838
1839                 sb_end_intwrite(sbi->sb);
1840
1841         } while (!kthread_should_stop());
1842         return 0;
1843 }
1844
1845 #ifdef CONFIG_BLK_DEV_ZONED
1846 static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
1847                 struct block_device *bdev, block_t blkstart, block_t blklen)
1848 {
1849         sector_t sector, nr_sects;
1850         block_t lblkstart = blkstart;
1851         int devi = 0;
1852
1853         if (f2fs_is_multi_device(sbi)) {
1854                 devi = f2fs_target_device_index(sbi, blkstart);
1855                 if (blkstart < FDEV(devi).start_blk ||
1856                     blkstart > FDEV(devi).end_blk) {
1857                         f2fs_err(sbi, "Invalid block %x", blkstart);
1858                         return -EIO;
1859                 }
1860                 blkstart -= FDEV(devi).start_blk;
1861         }
1862
1863         /* For sequential zones, reset the zone write pointer */
1864         if (f2fs_blkz_is_seq(sbi, devi, blkstart)) {
1865                 sector = SECTOR_FROM_BLOCK(blkstart);
1866                 nr_sects = SECTOR_FROM_BLOCK(blklen);
1867
1868                 if (sector & (bdev_zone_sectors(bdev) - 1) ||
1869                                 nr_sects != bdev_zone_sectors(bdev)) {
1870                         f2fs_err(sbi, "(%d) %s: Unaligned zone reset attempted (block %x + %x)",
1871                                  devi, sbi->s_ndevs ? FDEV(devi).path : "",
1872                                  blkstart, blklen);
1873                         return -EIO;
1874                 }
1875                 trace_f2fs_issue_reset_zone(bdev, blkstart);
1876                 return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
1877                                         sector, nr_sects, GFP_NOFS);
1878         }
1879
1880         /* For conventional zones, use regular discard if supported */
1881         return __queue_discard_cmd(sbi, bdev, lblkstart, blklen);
1882 }
1883 #endif
1884
1885 static int __issue_discard_async(struct f2fs_sb_info *sbi,
1886                 struct block_device *bdev, block_t blkstart, block_t blklen)
1887 {
1888 #ifdef CONFIG_BLK_DEV_ZONED
1889         if (f2fs_sb_has_blkzoned(sbi) && bdev_is_zoned(bdev))
1890                 return __f2fs_issue_discard_zone(sbi, bdev, blkstart, blklen);
1891 #endif
1892         return __queue_discard_cmd(sbi, bdev, blkstart, blklen);
1893 }
1894
1895 static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
1896                                 block_t blkstart, block_t blklen)
1897 {
1898         sector_t start = blkstart, len = 0;
1899         struct block_device *bdev;
1900         struct seg_entry *se;
1901         unsigned int offset;
1902         block_t i;
1903         int err = 0;
1904
1905         bdev = f2fs_target_device(sbi, blkstart, NULL);
1906
1907         for (i = blkstart; i < blkstart + blklen; i++, len++) {
1908                 if (i != start) {
1909                         struct block_device *bdev2 =
1910                                 f2fs_target_device(sbi, i, NULL);
1911
1912                         if (bdev2 != bdev) {
1913                                 err = __issue_discard_async(sbi, bdev,
1914                                                 start, len);
1915                                 if (err)
1916                                         return err;
1917                                 bdev = bdev2;
1918                                 start = i;
1919                                 len = 0;
1920                         }
1921                 }
1922
1923                 se = get_seg_entry(sbi, GET_SEGNO(sbi, i));
1924                 offset = GET_BLKOFF_FROM_SEG0(sbi, i);
1925
1926                 if (f2fs_block_unit_discard(sbi) &&
1927                                 !f2fs_test_and_set_bit(offset, se->discard_map))
1928                         sbi->discard_blks--;
1929         }
1930
1931         if (len)
1932                 err = __issue_discard_async(sbi, bdev, start, len);
1933         return err;
1934 }
1935
1936 static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
1937                                                         bool check_only)
1938 {
1939         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
1940         int max_blocks = sbi->blocks_per_seg;
1941         struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
1942         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
1943         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
1944         unsigned long *discard_map = (unsigned long *)se->discard_map;
1945         unsigned long *dmap = SIT_I(sbi)->tmp_map;
1946         unsigned int start = 0, end = -1;
1947         bool force = (cpc->reason & CP_DISCARD);
1948         struct discard_entry *de = NULL;
1949         struct list_head *head = &SM_I(sbi)->dcc_info->entry_list;
1950         int i;
1951
1952         if (se->valid_blocks == max_blocks || !f2fs_hw_support_discard(sbi) ||
1953                         !f2fs_block_unit_discard(sbi))
1954                 return false;
1955
1956         if (!force) {
1957                 if (!f2fs_realtime_discard_enable(sbi) || !se->valid_blocks ||
1958                         SM_I(sbi)->dcc_info->nr_discards >=
1959                                 SM_I(sbi)->dcc_info->max_discards)
1960                         return false;
1961         }
1962
1963         /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
1964         for (i = 0; i < entries; i++)
1965                 dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
1966                                 (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
1967
1968         while (force || SM_I(sbi)->dcc_info->nr_discards <=
1969                                 SM_I(sbi)->dcc_info->max_discards) {
1970                 start = __find_rev_next_bit(dmap, max_blocks, end + 1);
1971                 if (start >= max_blocks)
1972                         break;
1973
1974                 end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
1975                 if (force && start && end != max_blocks
1976                                         && (end - start) < cpc->trim_minlen)
1977                         continue;
1978
1979                 if (check_only)
1980                         return true;
1981
1982                 if (!de) {
1983                         de = f2fs_kmem_cache_alloc(discard_entry_slab,
1984                                                 GFP_F2FS_ZERO, true, NULL);
1985                         de->start_blkaddr = START_BLOCK(sbi, cpc->trim_start);
1986                         list_add_tail(&de->list, head);
1987                 }
1988
1989                 for (i = start; i < end; i++)
1990                         __set_bit_le(i, (void *)de->discard_map);
1991
1992                 SM_I(sbi)->dcc_info->nr_discards += end - start;
1993         }
1994         return false;
1995 }
1996
1997 static void release_discard_addr(struct discard_entry *entry)
1998 {
1999         list_del(&entry->list);
2000         kmem_cache_free(discard_entry_slab, entry);
2001 }
2002
2003 void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi)
2004 {
2005         struct list_head *head = &(SM_I(sbi)->dcc_info->entry_list);
2006         struct discard_entry *entry, *this;
2007
2008         /* drop caches */
2009         list_for_each_entry_safe(entry, this, head, list)
2010                 release_discard_addr(entry);
2011 }
2012
2013 /*
2014  * Should call f2fs_clear_prefree_segments after checkpoint is done.
2015  */
2016 static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
2017 {
2018         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2019         unsigned int segno;
2020
2021         mutex_lock(&dirty_i->seglist_lock);
2022         for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
2023                 __set_test_and_free(sbi, segno, false);
2024         mutex_unlock(&dirty_i->seglist_lock);
2025 }
2026
2027 void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
2028                                                 struct cp_control *cpc)
2029 {
2030         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
2031         struct list_head *head = &dcc->entry_list;
2032         struct discard_entry *entry, *this;
2033         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2034         unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
2035         unsigned int start = 0, end = -1;
2036         unsigned int secno, start_segno;
2037         bool force = (cpc->reason & CP_DISCARD);
2038         bool section_alignment = F2FS_OPTION(sbi).discard_unit ==
2039                                                 DISCARD_UNIT_SECTION;
2040
2041         if (f2fs_lfs_mode(sbi) && __is_large_section(sbi))
2042                 section_alignment = true;
2043
2044         mutex_lock(&dirty_i->seglist_lock);
2045
2046         while (1) {
2047                 int i;
2048
2049                 if (section_alignment && end != -1)
2050                         end--;
2051                 start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
2052                 if (start >= MAIN_SEGS(sbi))
2053                         break;
2054                 end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
2055                                                                 start + 1);
2056
2057                 if (section_alignment) {
2058                         start = rounddown(start, sbi->segs_per_sec);
2059                         end = roundup(end, sbi->segs_per_sec);
2060                 }
2061
2062                 for (i = start; i < end; i++) {
2063                         if (test_and_clear_bit(i, prefree_map))
2064                                 dirty_i->nr_dirty[PRE]--;
2065                 }
2066
2067                 if (!f2fs_realtime_discard_enable(sbi))
2068                         continue;
2069
2070                 if (force && start >= cpc->trim_start &&
2071                                         (end - 1) <= cpc->trim_end)
2072                                 continue;
2073
2074                 if (!f2fs_lfs_mode(sbi) || !__is_large_section(sbi)) {
2075                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
2076                                 (end - start) << sbi->log_blocks_per_seg);
2077                         continue;
2078                 }
2079 next:
2080                 secno = GET_SEC_FROM_SEG(sbi, start);
2081                 start_segno = GET_SEG_FROM_SEC(sbi, secno);
2082                 if (!IS_CURSEC(sbi, secno) &&
2083                         !get_valid_blocks(sbi, start, true))
2084                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start_segno),
2085                                 sbi->segs_per_sec << sbi->log_blocks_per_seg);
2086
2087                 start = start_segno + sbi->segs_per_sec;
2088                 if (start < end)
2089                         goto next;
2090                 else
2091                         end = start - 1;
2092         }
2093         mutex_unlock(&dirty_i->seglist_lock);
2094
2095         if (!f2fs_block_unit_discard(sbi))
2096                 goto wakeup;
2097
2098         /* send small discards */
2099         list_for_each_entry_safe(entry, this, head, list) {
2100                 unsigned int cur_pos = 0, next_pos, len, total_len = 0;
2101                 bool is_valid = test_bit_le(0, entry->discard_map);
2102
2103 find_next:
2104                 if (is_valid) {
2105                         next_pos = find_next_zero_bit_le(entry->discard_map,
2106                                         sbi->blocks_per_seg, cur_pos);
2107                         len = next_pos - cur_pos;
2108
2109                         if (f2fs_sb_has_blkzoned(sbi) ||
2110                             (force && len < cpc->trim_minlen))
2111                                 goto skip;
2112
2113                         f2fs_issue_discard(sbi, entry->start_blkaddr + cur_pos,
2114                                                                         len);
2115                         total_len += len;
2116                 } else {
2117                         next_pos = find_next_bit_le(entry->discard_map,
2118                                         sbi->blocks_per_seg, cur_pos);
2119                 }
2120 skip:
2121                 cur_pos = next_pos;
2122                 is_valid = !is_valid;
2123
2124                 if (cur_pos < sbi->blocks_per_seg)
2125                         goto find_next;
2126
2127                 release_discard_addr(entry);
2128                 dcc->nr_discards -= total_len;
2129         }
2130
2131 wakeup:
2132         wake_up_discard_thread(sbi, false);
2133 }
2134
2135 int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
2136 {
2137         dev_t dev = sbi->sb->s_bdev->bd_dev;
2138         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
2139         int err = 0;
2140
2141         if (!f2fs_realtime_discard_enable(sbi))
2142                 return 0;
2143
2144         dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
2145                                 "f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
2146         if (IS_ERR(dcc->f2fs_issue_discard))
2147                 err = PTR_ERR(dcc->f2fs_issue_discard);
2148
2149         return err;
2150 }
2151
2152 static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
2153 {
2154         struct discard_cmd_control *dcc;
2155         int err = 0, i;
2156
2157         if (SM_I(sbi)->dcc_info) {
2158                 dcc = SM_I(sbi)->dcc_info;
2159                 goto init_thread;
2160         }
2161
2162         dcc = f2fs_kzalloc(sbi, sizeof(struct discard_cmd_control), GFP_KERNEL);
2163         if (!dcc)
2164                 return -ENOMEM;
2165
2166         dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY;
2167         if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SEGMENT)
2168                 dcc->discard_granularity = sbi->blocks_per_seg;
2169         else if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SECTION)
2170                 dcc->discard_granularity = BLKS_PER_SEC(sbi);
2171
2172         INIT_LIST_HEAD(&dcc->entry_list);
2173         for (i = 0; i < MAX_PLIST_NUM; i++)
2174                 INIT_LIST_HEAD(&dcc->pend_list[i]);
2175         INIT_LIST_HEAD(&dcc->wait_list);
2176         INIT_LIST_HEAD(&dcc->fstrim_list);
2177         mutex_init(&dcc->cmd_lock);
2178         atomic_set(&dcc->issued_discard, 0);
2179         atomic_set(&dcc->queued_discard, 0);
2180         atomic_set(&dcc->discard_cmd_cnt, 0);
2181         dcc->nr_discards = 0;
2182         dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
2183         dcc->undiscard_blks = 0;
2184         dcc->next_pos = 0;
2185         dcc->root = RB_ROOT_CACHED;
2186         dcc->rbtree_check = false;
2187
2188         init_waitqueue_head(&dcc->discard_wait_queue);
2189         SM_I(sbi)->dcc_info = dcc;
2190 init_thread:
2191         err = f2fs_start_discard_thread(sbi);
2192         if (err) {
2193                 kfree(dcc);
2194                 SM_I(sbi)->dcc_info = NULL;
2195         }
2196
2197         return err;
2198 }
2199
2200 static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
2201 {
2202         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
2203
2204         if (!dcc)
2205                 return;
2206
2207         f2fs_stop_discard_thread(sbi);
2208
2209         /*
2210          * Recovery can cache discard commands, so in error path of
2211          * fill_super(), it needs to give a chance to handle them.
2212          */
2213         if (unlikely(atomic_read(&dcc->discard_cmd_cnt)))
2214                 f2fs_issue_discard_timeout(sbi);
2215
2216         kfree(dcc);
2217         SM_I(sbi)->dcc_info = NULL;
2218 }
2219
2220 static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
2221 {
2222         struct sit_info *sit_i = SIT_I(sbi);
2223
2224         if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap)) {
2225                 sit_i->dirty_sentries++;
2226                 return false;
2227         }
2228
2229         return true;
2230 }
2231
2232 static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
2233                                         unsigned int segno, int modified)
2234 {
2235         struct seg_entry *se = get_seg_entry(sbi, segno);
2236
2237         se->type = type;
2238         if (modified)
2239                 __mark_sit_entry_dirty(sbi, segno);
2240 }
2241
2242 static inline unsigned long long get_segment_mtime(struct f2fs_sb_info *sbi,
2243                                                                 block_t blkaddr)
2244 {
2245         unsigned int segno = GET_SEGNO(sbi, blkaddr);
2246
2247         if (segno == NULL_SEGNO)
2248                 return 0;
2249         return get_seg_entry(sbi, segno)->mtime;
2250 }
2251
2252 static void update_segment_mtime(struct f2fs_sb_info *sbi, block_t blkaddr,
2253                                                 unsigned long long old_mtime)
2254 {
2255         struct seg_entry *se;
2256         unsigned int segno = GET_SEGNO(sbi, blkaddr);
2257         unsigned long long ctime = get_mtime(sbi, false);
2258         unsigned long long mtime = old_mtime ? old_mtime : ctime;
2259
2260         if (segno == NULL_SEGNO)
2261                 return;
2262
2263         se = get_seg_entry(sbi, segno);
2264
2265         if (!se->mtime)
2266                 se->mtime = mtime;
2267         else
2268                 se->mtime = div_u64(se->mtime * se->valid_blocks + mtime,
2269                                                 se->valid_blocks + 1);
2270
2271         if (ctime > SIT_I(sbi)->max_mtime)
2272                 SIT_I(sbi)->max_mtime = ctime;
2273 }
2274
2275 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
2276 {
2277         struct seg_entry *se;
2278         unsigned int segno, offset;
2279         long int new_vblocks;
2280         bool exist;
2281 #ifdef CONFIG_F2FS_CHECK_FS
2282         bool mir_exist;
2283 #endif
2284
2285         segno = GET_SEGNO(sbi, blkaddr);
2286
2287         se = get_seg_entry(sbi, segno);
2288         new_vblocks = se->valid_blocks + del;
2289         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
2290
2291         f2fs_bug_on(sbi, (new_vblocks < 0 ||
2292                         (new_vblocks > f2fs_usable_blks_in_seg(sbi, segno))));
2293
2294         se->valid_blocks = new_vblocks;
2295
2296         /* Update valid block bitmap */
2297         if (del > 0) {
2298                 exist = f2fs_test_and_set_bit(offset, se->cur_valid_map);
2299 #ifdef CONFIG_F2FS_CHECK_FS
2300                 mir_exist = f2fs_test_and_set_bit(offset,
2301                                                 se->cur_valid_map_mir);
2302                 if (unlikely(exist != mir_exist)) {
2303                         f2fs_err(sbi, "Inconsistent error when setting bitmap, blk:%u, old bit:%d",
2304                                  blkaddr, exist);
2305                         f2fs_bug_on(sbi, 1);
2306                 }
2307 #endif
2308                 if (unlikely(exist)) {
2309                         f2fs_err(sbi, "Bitmap was wrongly set, blk:%u",
2310                                  blkaddr);
2311                         f2fs_bug_on(sbi, 1);
2312                         se->valid_blocks--;
2313                         del = 0;
2314                 }
2315
2316                 if (f2fs_block_unit_discard(sbi) &&
2317                                 !f2fs_test_and_set_bit(offset, se->discard_map))
2318                         sbi->discard_blks--;
2319
2320                 /*
2321                  * SSR should never reuse block which is checkpointed
2322                  * or newly invalidated.
2323                  */
2324                 if (!is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
2325                         if (!f2fs_test_and_set_bit(offset, se->ckpt_valid_map))
2326                                 se->ckpt_valid_blocks++;
2327                 }
2328         } else {
2329                 exist = f2fs_test_and_clear_bit(offset, se->cur_valid_map);
2330 #ifdef CONFIG_F2FS_CHECK_FS
2331                 mir_exist = f2fs_test_and_clear_bit(offset,
2332                                                 se->cur_valid_map_mir);
2333                 if (unlikely(exist != mir_exist)) {
2334                         f2fs_err(sbi, "Inconsistent error when clearing bitmap, blk:%u, old bit:%d",
2335                                  blkaddr, exist);
2336                         f2fs_bug_on(sbi, 1);
2337                 }
2338 #endif
2339                 if (unlikely(!exist)) {
2340                         f2fs_err(sbi, "Bitmap was wrongly cleared, blk:%u",
2341                                  blkaddr);
2342                         f2fs_bug_on(sbi, 1);
2343                         se->valid_blocks++;
2344                         del = 0;
2345                 } else if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
2346                         /*
2347                          * If checkpoints are off, we must not reuse data that
2348                          * was used in the previous checkpoint. If it was used
2349                          * before, we must track that to know how much space we
2350                          * really have.
2351                          */
2352                         if (f2fs_test_bit(offset, se->ckpt_valid_map)) {
2353                                 spin_lock(&sbi->stat_lock);
2354                                 sbi->unusable_block_count++;
2355                                 spin_unlock(&sbi->stat_lock);
2356                         }
2357                 }
2358
2359                 if (f2fs_block_unit_discard(sbi) &&
2360                         f2fs_test_and_clear_bit(offset, se->discard_map))
2361                         sbi->discard_blks++;
2362         }
2363         if (!f2fs_test_bit(offset, se->ckpt_valid_map))
2364                 se->ckpt_valid_blocks += del;
2365
2366         __mark_sit_entry_dirty(sbi, segno);
2367
2368         /* update total number of valid blocks to be written in ckpt area */
2369         SIT_I(sbi)->written_valid_blocks += del;
2370
2371         if (__is_large_section(sbi))
2372                 get_sec_entry(sbi, segno)->valid_blocks += del;
2373 }
2374
2375 void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
2376 {
2377         unsigned int segno = GET_SEGNO(sbi, addr);
2378         struct sit_info *sit_i = SIT_I(sbi);
2379
2380         f2fs_bug_on(sbi, addr == NULL_ADDR);
2381         if (addr == NEW_ADDR || addr == COMPRESS_ADDR)
2382                 return;
2383
2384         invalidate_mapping_pages(META_MAPPING(sbi), addr, addr);
2385         f2fs_invalidate_compress_page(sbi, addr);
2386
2387         /* add it into sit main buffer */
2388         down_write(&sit_i->sentry_lock);
2389
2390         update_segment_mtime(sbi, addr, 0);
2391         update_sit_entry(sbi, addr, -1);
2392
2393         /* add it into dirty seglist */
2394         locate_dirty_segment(sbi, segno);
2395
2396         up_write(&sit_i->sentry_lock);
2397 }
2398
2399 bool f2fs_is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr)
2400 {
2401         struct sit_info *sit_i = SIT_I(sbi);
2402         unsigned int segno, offset;
2403         struct seg_entry *se;
2404         bool is_cp = false;
2405
2406         if (!__is_valid_data_blkaddr(blkaddr))
2407                 return true;
2408
2409         down_read(&sit_i->sentry_lock);
2410
2411         segno = GET_SEGNO(sbi, blkaddr);
2412         se = get_seg_entry(sbi, segno);
2413         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
2414
2415         if (f2fs_test_bit(offset, se->ckpt_valid_map))
2416                 is_cp = true;
2417
2418         up_read(&sit_i->sentry_lock);
2419
2420         return is_cp;
2421 }
2422
2423 /*
2424  * This function should be resided under the curseg_mutex lock
2425  */
2426 static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
2427                                         struct f2fs_summary *sum)
2428 {
2429         struct curseg_info *curseg = CURSEG_I(sbi, type);
2430         void *addr = curseg->sum_blk;
2431
2432         addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
2433         memcpy(addr, sum, sizeof(struct f2fs_summary));
2434 }
2435
2436 /*
2437  * Calculate the number of current summary pages for writing
2438  */
2439 int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra)
2440 {
2441         int valid_sum_count = 0;
2442         int i, sum_in_page;
2443
2444         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
2445                 if (sbi->ckpt->alloc_type[i] == SSR)
2446                         valid_sum_count += sbi->blocks_per_seg;
2447                 else {
2448                         if (for_ra)
2449                                 valid_sum_count += le16_to_cpu(
2450                                         F2FS_CKPT(sbi)->cur_data_blkoff[i]);
2451                         else
2452                                 valid_sum_count += curseg_blkoff(sbi, i);
2453                 }
2454         }
2455
2456         sum_in_page = (PAGE_SIZE - 2 * SUM_JOURNAL_SIZE -
2457                         SUM_FOOTER_SIZE) / SUMMARY_SIZE;
2458         if (valid_sum_count <= sum_in_page)
2459                 return 1;
2460         else if ((valid_sum_count - sum_in_page) <=
2461                 (PAGE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
2462                 return 2;
2463         return 3;
2464 }
2465
2466 /*
2467  * Caller should put this summary page
2468  */
2469 struct page *f2fs_get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
2470 {
2471         if (unlikely(f2fs_cp_error(sbi)))
2472                 return ERR_PTR(-EIO);
2473         return f2fs_get_meta_page_retry(sbi, GET_SUM_BLOCK(sbi, segno));
2474 }
2475
2476 void f2fs_update_meta_page(struct f2fs_sb_info *sbi,
2477                                         void *src, block_t blk_addr)
2478 {
2479         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
2480
2481         memcpy(page_address(page), src, PAGE_SIZE);
2482         set_page_dirty(page);
2483         f2fs_put_page(page, 1);
2484 }
2485
2486 static void write_sum_page(struct f2fs_sb_info *sbi,
2487                         struct f2fs_summary_block *sum_blk, block_t blk_addr)
2488 {
2489         f2fs_update_meta_page(sbi, (void *)sum_blk, blk_addr);
2490 }
2491
2492 static void write_current_sum_page(struct f2fs_sb_info *sbi,
2493                                                 int type, block_t blk_addr)
2494 {
2495         struct curseg_info *curseg = CURSEG_I(sbi, type);
2496         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
2497         struct f2fs_summary_block *src = curseg->sum_blk;
2498         struct f2fs_summary_block *dst;
2499
2500         dst = (struct f2fs_summary_block *)page_address(page);
2501         memset(dst, 0, PAGE_SIZE);
2502
2503         mutex_lock(&curseg->curseg_mutex);
2504
2505         down_read(&curseg->journal_rwsem);
2506         memcpy(&dst->journal, curseg->journal, SUM_JOURNAL_SIZE);
2507         up_read(&curseg->journal_rwsem);
2508
2509         memcpy(dst->entries, src->entries, SUM_ENTRY_SIZE);
2510         memcpy(&dst->footer, &src->footer, SUM_FOOTER_SIZE);
2511
2512         mutex_unlock(&curseg->curseg_mutex);
2513
2514         set_page_dirty(page);
2515         f2fs_put_page(page, 1);
2516 }
2517
2518 static int is_next_segment_free(struct f2fs_sb_info *sbi,
2519                                 struct curseg_info *curseg, int type)
2520 {
2521         unsigned int segno = curseg->segno + 1;
2522         struct free_segmap_info *free_i = FREE_I(sbi);
2523
2524         if (segno < MAIN_SEGS(sbi) && segno % sbi->segs_per_sec)
2525                 return !test_bit(segno, free_i->free_segmap);
2526         return 0;
2527 }
2528
2529 /*
2530  * Find a new segment from the free segments bitmap to right order
2531  * This function should be returned with success, otherwise BUG
2532  */
2533 static void get_new_segment(struct f2fs_sb_info *sbi,
2534                         unsigned int *newseg, bool new_sec, int dir)
2535 {
2536         struct free_segmap_info *free_i = FREE_I(sbi);
2537         unsigned int segno, secno, zoneno;
2538         unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
2539         unsigned int hint = GET_SEC_FROM_SEG(sbi, *newseg);
2540         unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
2541         unsigned int left_start = hint;
2542         bool init = true;
2543         int go_left = 0;
2544         int i;
2545
2546         spin_lock(&free_i->segmap_lock);
2547
2548         if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
2549                 segno = find_next_zero_bit(free_i->free_segmap,
2550                         GET_SEG_FROM_SEC(sbi, hint + 1), *newseg + 1);
2551                 if (segno < GET_SEG_FROM_SEC(sbi, hint + 1))
2552                         goto got_it;
2553         }
2554 find_other_zone:
2555         secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
2556         if (secno >= MAIN_SECS(sbi)) {
2557                 if (dir == ALLOC_RIGHT) {
2558                         secno = find_first_zero_bit(free_i->free_secmap,
2559                                                         MAIN_SECS(sbi));
2560                         f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
2561                 } else {
2562                         go_left = 1;
2563                         left_start = hint - 1;
2564                 }
2565         }
2566         if (go_left == 0)
2567                 goto skip_left;
2568
2569         while (test_bit(left_start, free_i->free_secmap)) {
2570                 if (left_start > 0) {
2571                         left_start--;
2572                         continue;
2573                 }
2574                 left_start = find_first_zero_bit(free_i->free_secmap,
2575                                                         MAIN_SECS(sbi));
2576                 f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
2577                 break;
2578         }
2579         secno = left_start;
2580 skip_left:
2581         segno = GET_SEG_FROM_SEC(sbi, secno);
2582         zoneno = GET_ZONE_FROM_SEC(sbi, secno);
2583
2584         /* give up on finding another zone */
2585         if (!init)
2586                 goto got_it;
2587         if (sbi->secs_per_zone == 1)
2588                 goto got_it;
2589         if (zoneno == old_zoneno)
2590                 goto got_it;
2591         if (dir == ALLOC_LEFT) {
2592                 if (!go_left && zoneno + 1 >= total_zones)
2593                         goto got_it;
2594                 if (go_left && zoneno == 0)
2595                         goto got_it;
2596         }
2597         for (i = 0; i < NR_CURSEG_TYPE; i++)
2598                 if (CURSEG_I(sbi, i)->zone == zoneno)
2599                         break;
2600
2601         if (i < NR_CURSEG_TYPE) {
2602                 /* zone is in user, try another */
2603                 if (go_left)
2604                         hint = zoneno * sbi->secs_per_zone - 1;
2605                 else if (zoneno + 1 >= total_zones)
2606                         hint = 0;
2607                 else
2608                         hint = (zoneno + 1) * sbi->secs_per_zone;
2609                 init = false;
2610                 goto find_other_zone;
2611         }
2612 got_it:
2613         /* set it as dirty segment in free segmap */
2614         f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
2615         __set_inuse(sbi, segno);
2616         *newseg = segno;
2617         spin_unlock(&free_i->segmap_lock);
2618 }
2619
2620 static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
2621 {
2622         struct curseg_info *curseg = CURSEG_I(sbi, type);
2623         struct summary_footer *sum_footer;
2624         unsigned short seg_type = curseg->seg_type;
2625
2626         curseg->inited = true;
2627         curseg->segno = curseg->next_segno;
2628         curseg->zone = GET_ZONE_FROM_SEG(sbi, curseg->segno);
2629         curseg->next_blkoff = 0;
2630         curseg->next_segno = NULL_SEGNO;
2631
2632         sum_footer = &(curseg->sum_blk->footer);
2633         memset(sum_footer, 0, sizeof(struct summary_footer));
2634
2635         sanity_check_seg_type(sbi, seg_type);
2636
2637         if (IS_DATASEG(seg_type))
2638                 SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
2639         if (IS_NODESEG(seg_type))
2640                 SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
2641         __set_sit_entry_type(sbi, seg_type, curseg->segno, modified);
2642 }
2643
2644 static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
2645 {
2646         struct curseg_info *curseg = CURSEG_I(sbi, type);
2647         unsigned short seg_type = curseg->seg_type;
2648
2649         sanity_check_seg_type(sbi, seg_type);
2650         if (f2fs_need_rand_seg(sbi))
2651                 return prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
2652
2653         /* if segs_per_sec is large than 1, we need to keep original policy. */
2654         if (__is_large_section(sbi))
2655                 return curseg->segno;
2656
2657         /* inmem log may not locate on any segment after mount */
2658         if (!curseg->inited)
2659                 return 0;
2660
2661         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
2662                 return 0;
2663
2664         if (test_opt(sbi, NOHEAP) &&
2665                 (seg_type == CURSEG_HOT_DATA || IS_NODESEG(seg_type)))
2666                 return 0;
2667
2668         if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
2669                 return SIT_I(sbi)->last_victim[ALLOC_NEXT];
2670
2671         /* find segments from 0 to reuse freed segments */
2672         if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
2673                 return 0;
2674
2675         return curseg->segno;
2676 }
2677
2678 /*
2679  * Allocate a current working segment.
2680  * This function always allocates a free segment in LFS manner.
2681  */
2682 static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
2683 {
2684         struct curseg_info *curseg = CURSEG_I(sbi, type);
2685         unsigned short seg_type = curseg->seg_type;
2686         unsigned int segno = curseg->segno;
2687         int dir = ALLOC_LEFT;
2688
2689         if (curseg->inited)
2690                 write_sum_page(sbi, curseg->sum_blk,
2691                                 GET_SUM_BLOCK(sbi, segno));
2692         if (seg_type == CURSEG_WARM_DATA || seg_type == CURSEG_COLD_DATA)
2693                 dir = ALLOC_RIGHT;
2694
2695         if (test_opt(sbi, NOHEAP))
2696                 dir = ALLOC_RIGHT;
2697
2698         segno = __get_next_segno(sbi, type);
2699         get_new_segment(sbi, &segno, new_sec, dir);
2700         curseg->next_segno = segno;
2701         reset_curseg(sbi, type, 1);
2702         curseg->alloc_type = LFS;
2703         if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK)
2704                 curseg->fragment_remained_chunk =
2705                                 prandom_u32() % sbi->max_fragment_chunk + 1;
2706 }
2707
2708 static int __next_free_blkoff(struct f2fs_sb_info *sbi,
2709                                         int segno, block_t start)
2710 {
2711         struct seg_entry *se = get_seg_entry(sbi, segno);
2712         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
2713         unsigned long *target_map = SIT_I(sbi)->tmp_map;
2714         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
2715         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
2716         int i;
2717
2718         for (i = 0; i < entries; i++)
2719                 target_map[i] = ckpt_map[i] | cur_map[i];
2720
2721         return __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
2722 }
2723
2724 /*
2725  * If a segment is written by LFS manner, next block offset is just obtained
2726  * by increasing the current block offset. However, if a segment is written by
2727  * SSR manner, next block offset obtained by calling __next_free_blkoff
2728  */
2729 static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
2730                                 struct curseg_info *seg)
2731 {
2732         if (seg->alloc_type == SSR) {
2733                 seg->next_blkoff =
2734                         __next_free_blkoff(sbi, seg->segno,
2735                                                 seg->next_blkoff + 1);
2736         } else {
2737                 seg->next_blkoff++;
2738                 if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK) {
2739                         /* To allocate block chunks in different sizes, use random number */
2740                         if (--seg->fragment_remained_chunk <= 0) {
2741                                 seg->fragment_remained_chunk =
2742                                    prandom_u32() % sbi->max_fragment_chunk + 1;
2743                                 seg->next_blkoff +=
2744                                    prandom_u32() % sbi->max_fragment_hole + 1;
2745                         }
2746                 }
2747         }
2748 }
2749
2750 bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno)
2751 {
2752         return __next_free_blkoff(sbi, segno, 0) < sbi->blocks_per_seg;
2753 }
2754
2755 /*
2756  * This function always allocates a used segment(from dirty seglist) by SSR
2757  * manner, so it should recover the existing segment information of valid blocks
2758  */
2759 static void change_curseg(struct f2fs_sb_info *sbi, int type, bool flush)
2760 {
2761         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2762         struct curseg_info *curseg = CURSEG_I(sbi, type);
2763         unsigned int new_segno = curseg->next_segno;
2764         struct f2fs_summary_block *sum_node;
2765         struct page *sum_page;
2766
2767         if (flush)
2768                 write_sum_page(sbi, curseg->sum_blk,
2769                                         GET_SUM_BLOCK(sbi, curseg->segno));
2770
2771         __set_test_and_inuse(sbi, new_segno);
2772
2773         mutex_lock(&dirty_i->seglist_lock);
2774         __remove_dirty_segment(sbi, new_segno, PRE);
2775         __remove_dirty_segment(sbi, new_segno, DIRTY);
2776         mutex_unlock(&dirty_i->seglist_lock);
2777
2778         reset_curseg(sbi, type, 1);
2779         curseg->alloc_type = SSR;
2780         curseg->next_blkoff = __next_free_blkoff(sbi, curseg->segno, 0);
2781
2782         sum_page = f2fs_get_sum_page(sbi, new_segno);
2783         if (IS_ERR(sum_page)) {
2784                 /* GC won't be able to use stale summary pages by cp_error */
2785                 memset(curseg->sum_blk, 0, SUM_ENTRY_SIZE);
2786                 return;
2787         }
2788         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
2789         memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
2790         f2fs_put_page(sum_page, 1);
2791 }
2792
2793 static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
2794                                 int alloc_mode, unsigned long long age);
2795
2796 static void get_atssr_segment(struct f2fs_sb_info *sbi, int type,
2797                                         int target_type, int alloc_mode,
2798                                         unsigned long long age)
2799 {
2800         struct curseg_info *curseg = CURSEG_I(sbi, type);
2801
2802         curseg->seg_type = target_type;
2803
2804         if (get_ssr_segment(sbi, type, alloc_mode, age)) {
2805                 struct seg_entry *se = get_seg_entry(sbi, curseg->next_segno);
2806
2807                 curseg->seg_type = se->type;
2808                 change_curseg(sbi, type, true);
2809         } else {
2810                 /* allocate cold segment by default */
2811                 curseg->seg_type = CURSEG_COLD_DATA;
2812                 new_curseg(sbi, type, true);
2813         }
2814         stat_inc_seg_type(sbi, curseg);
2815 }
2816
2817 static void __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi)
2818 {
2819         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC);
2820
2821         if (!sbi->am.atgc_enabled)
2822                 return;
2823
2824         down_read(&SM_I(sbi)->curseg_lock);
2825
2826         mutex_lock(&curseg->curseg_mutex);
2827         down_write(&SIT_I(sbi)->sentry_lock);
2828
2829         get_atssr_segment(sbi, CURSEG_ALL_DATA_ATGC, CURSEG_COLD_DATA, SSR, 0);
2830
2831         up_write(&SIT_I(sbi)->sentry_lock);
2832         mutex_unlock(&curseg->curseg_mutex);
2833
2834         up_read(&SM_I(sbi)->curseg_lock);
2835
2836 }
2837 void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi)
2838 {
2839         __f2fs_init_atgc_curseg(sbi);
2840 }
2841
2842 static void __f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type)
2843 {
2844         struct curseg_info *curseg = CURSEG_I(sbi, type);
2845
2846         mutex_lock(&curseg->curseg_mutex);
2847         if (!curseg->inited)
2848                 goto out;
2849
2850         if (get_valid_blocks(sbi, curseg->segno, false)) {
2851                 write_sum_page(sbi, curseg->sum_blk,
2852                                 GET_SUM_BLOCK(sbi, curseg->segno));
2853         } else {
2854                 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
2855                 __set_test_and_free(sbi, curseg->segno, true);
2856                 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
2857         }
2858 out:
2859         mutex_unlock(&curseg->curseg_mutex);
2860 }
2861
2862 void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi)
2863 {
2864         __f2fs_save_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
2865
2866         if (sbi->am.atgc_enabled)
2867                 __f2fs_save_inmem_curseg(sbi, CURSEG_ALL_DATA_ATGC);
2868 }
2869
2870 static void __f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi, int type)
2871 {
2872         struct curseg_info *curseg = CURSEG_I(sbi, type);
2873
2874         mutex_lock(&curseg->curseg_mutex);
2875         if (!curseg->inited)
2876                 goto out;
2877         if (get_valid_blocks(sbi, curseg->segno, false))
2878                 goto out;
2879
2880         mutex_lock(&DIRTY_I(sbi)->seglist_lock);
2881         __set_test_and_inuse(sbi, curseg->segno);
2882         mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
2883 out:
2884         mutex_unlock(&curseg->curseg_mutex);
2885 }
2886
2887 void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi)
2888 {
2889         __f2fs_restore_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
2890
2891         if (sbi->am.atgc_enabled)
2892                 __f2fs_restore_inmem_curseg(sbi, CURSEG_ALL_DATA_ATGC);
2893 }
2894
2895 static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
2896                                 int alloc_mode, unsigned long long age)
2897 {
2898         struct curseg_info *curseg = CURSEG_I(sbi, type);
2899         const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
2900         unsigned segno = NULL_SEGNO;
2901         unsigned short seg_type = curseg->seg_type;
2902         int i, cnt;
2903         bool reversed = false;
2904
2905         sanity_check_seg_type(sbi, seg_type);
2906
2907         /* f2fs_need_SSR() already forces to do this */
2908         if (!v_ops->get_victim(sbi, &segno, BG_GC, seg_type, alloc_mode, age)) {
2909                 curseg->next_segno = segno;
2910                 return 1;
2911         }
2912
2913         /* For node segments, let's do SSR more intensively */
2914         if (IS_NODESEG(seg_type)) {
2915                 if (seg_type >= CURSEG_WARM_NODE) {
2916                         reversed = true;
2917                         i = CURSEG_COLD_NODE;
2918                 } else {
2919                         i = CURSEG_HOT_NODE;
2920                 }
2921                 cnt = NR_CURSEG_NODE_TYPE;
2922         } else {
2923                 if (seg_type >= CURSEG_WARM_DATA) {
2924                         reversed = true;
2925                         i = CURSEG_COLD_DATA;
2926                 } else {
2927                         i = CURSEG_HOT_DATA;
2928                 }
2929                 cnt = NR_CURSEG_DATA_TYPE;
2930         }
2931
2932         for (; cnt-- > 0; reversed ? i-- : i++) {
2933                 if (i == seg_type)
2934                         continue;
2935                 if (!v_ops->get_victim(sbi, &segno, BG_GC, i, alloc_mode, age)) {
2936                         curseg->next_segno = segno;
2937                         return 1;
2938                 }
2939         }
2940
2941         /* find valid_blocks=0 in dirty list */
2942         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
2943                 segno = get_free_segment(sbi);
2944                 if (segno != NULL_SEGNO) {
2945                         curseg->next_segno = segno;
2946                         return 1;
2947                 }
2948         }
2949         return 0;
2950 }
2951
2952 /*
2953  * flush out current segment and replace it with new segment
2954  * This function should be returned with success, otherwise BUG
2955  */
2956 static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
2957                                                 int type, bool force)
2958 {
2959         struct curseg_info *curseg = CURSEG_I(sbi, type);
2960
2961         if (force)
2962                 new_curseg(sbi, type, true);
2963         else if (!is_set_ckpt_flags(sbi, CP_CRC_RECOVERY_FLAG) &&
2964                                         curseg->seg_type == CURSEG_WARM_NODE)
2965                 new_curseg(sbi, type, false);
2966         else if (curseg->alloc_type == LFS &&
2967                         is_next_segment_free(sbi, curseg, type) &&
2968                         likely(!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
2969                 new_curseg(sbi, type, false);
2970         else if (f2fs_need_SSR(sbi) &&
2971                         get_ssr_segment(sbi, type, SSR, 0))
2972                 change_curseg(sbi, type, true);
2973         else
2974                 new_curseg(sbi, type, false);
2975
2976         stat_inc_seg_type(sbi, curseg);
2977 }
2978
2979 void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
2980                                         unsigned int start, unsigned int end)
2981 {
2982         struct curseg_info *curseg = CURSEG_I(sbi, type);
2983         unsigned int segno;
2984
2985         down_read(&SM_I(sbi)->curseg_lock);
2986         mutex_lock(&curseg->curseg_mutex);
2987         down_write(&SIT_I(sbi)->sentry_lock);
2988
2989         segno = CURSEG_I(sbi, type)->segno;
2990         if (segno < start || segno > end)
2991                 goto unlock;
2992
2993         if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type, SSR, 0))
2994                 change_curseg(sbi, type, true);
2995         else
2996                 new_curseg(sbi, type, true);
2997
2998         stat_inc_seg_type(sbi, curseg);
2999
3000         locate_dirty_segment(sbi, segno);
3001 unlock:
3002         up_write(&SIT_I(sbi)->sentry_lock);
3003
3004         if (segno != curseg->segno)
3005                 f2fs_notice(sbi, "For resize: curseg of type %d: %u ==> %u",
3006                             type, segno, curseg->segno);
3007
3008         mutex_unlock(&curseg->curseg_mutex);
3009         up_read(&SM_I(sbi)->curseg_lock);
3010 }
3011
3012 static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
3013                                                 bool new_sec, bool force)
3014 {
3015         struct curseg_info *curseg = CURSEG_I(sbi, type);
3016         unsigned int old_segno;
3017
3018         if (!curseg->inited)
3019                 goto alloc;
3020
3021         if (force || curseg->next_blkoff ||
3022                 get_valid_blocks(sbi, curseg->segno, new_sec))
3023                 goto alloc;
3024
3025         if (!get_ckpt_valid_blocks(sbi, curseg->segno, new_sec))
3026                 return;
3027 alloc:
3028         old_segno = curseg->segno;
3029         SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true);
3030         locate_dirty_segment(sbi, old_segno);
3031 }
3032
3033 static void __allocate_new_section(struct f2fs_sb_info *sbi,
3034                                                 int type, bool force)
3035 {
3036         __allocate_new_segment(sbi, type, true, force);
3037 }
3038
3039 void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force)
3040 {
3041         down_read(&SM_I(sbi)->curseg_lock);
3042         down_write(&SIT_I(sbi)->sentry_lock);
3043         __allocate_new_section(sbi, type, force);
3044         up_write(&SIT_I(sbi)->sentry_lock);
3045         up_read(&SM_I(sbi)->curseg_lock);
3046 }
3047
3048 void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
3049 {
3050         int i;
3051
3052         down_read(&SM_I(sbi)->curseg_lock);
3053         down_write(&SIT_I(sbi)->sentry_lock);
3054         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++)
3055                 __allocate_new_segment(sbi, i, false, false);
3056         up_write(&SIT_I(sbi)->sentry_lock);
3057         up_read(&SM_I(sbi)->curseg_lock);
3058 }
3059
3060 static const struct segment_allocation default_salloc_ops = {
3061         .allocate_segment = allocate_segment_by_default,
3062 };
3063
3064 bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
3065                                                 struct cp_control *cpc)
3066 {
3067         __u64 trim_start = cpc->trim_start;
3068         bool has_candidate = false;
3069
3070         down_write(&SIT_I(sbi)->sentry_lock);
3071         for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++) {
3072                 if (add_discard_addrs(sbi, cpc, true)) {
3073                         has_candidate = true;
3074                         break;
3075                 }
3076         }
3077         up_write(&SIT_I(sbi)->sentry_lock);
3078
3079         cpc->trim_start = trim_start;
3080         return has_candidate;
3081 }
3082
3083 static unsigned int __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
3084                                         struct discard_policy *dpolicy,
3085                                         unsigned int start, unsigned int end)
3086 {
3087         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
3088         struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
3089         struct rb_node **insert_p = NULL, *insert_parent = NULL;
3090         struct discard_cmd *dc;
3091         struct blk_plug plug;
3092         int issued;
3093         unsigned int trimmed = 0;
3094
3095 next:
3096         issued = 0;
3097
3098         mutex_lock(&dcc->cmd_lock);
3099         if (unlikely(dcc->rbtree_check))
3100                 f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
3101                                                         &dcc->root, false));
3102
3103         dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
3104                                         NULL, start,
3105                                         (struct rb_entry **)&prev_dc,
3106                                         (struct rb_entry **)&next_dc,
3107                                         &insert_p, &insert_parent, true, NULL);
3108         if (!dc)
3109                 dc = next_dc;
3110
3111         blk_start_plug(&plug);
3112
3113         while (dc && dc->lstart <= end) {
3114                 struct rb_node *node;
3115                 int err = 0;
3116
3117                 if (dc->len < dpolicy->granularity)
3118                         goto skip;
3119
3120                 if (dc->state != D_PREP) {
3121                         list_move_tail(&dc->list, &dcc->fstrim_list);
3122                         goto skip;
3123                 }
3124
3125                 err = __submit_discard_cmd(sbi, dpolicy, dc, &issued);
3126
3127                 if (issued >= dpolicy->max_requests) {
3128                         start = dc->lstart + dc->len;
3129
3130                         if (err)
3131                                 __remove_discard_cmd(sbi, dc);
3132
3133                         blk_finish_plug(&plug);
3134                         mutex_unlock(&dcc->cmd_lock);
3135                         trimmed += __wait_all_discard_cmd(sbi, NULL);
3136                         congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
3137                         goto next;
3138                 }
3139 skip:
3140                 node = rb_next(&dc->rb_node);
3141                 if (err)
3142                         __remove_discard_cmd(sbi, dc);
3143                 dc = rb_entry_safe(node, struct discard_cmd, rb_node);
3144
3145                 if (fatal_signal_pending(current))
3146                         break;
3147         }
3148
3149         blk_finish_plug(&plug);
3150         mutex_unlock(&dcc->cmd_lock);
3151
3152         return trimmed;
3153 }
3154
3155 int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
3156 {
3157         __u64 start = F2FS_BYTES_TO_BLK(range->start);
3158         __u64 end = start + F2FS_BYTES_TO_BLK(range->len) - 1;
3159         unsigned int start_segno, end_segno;
3160         block_t start_block, end_block;
3161         struct cp_control cpc;
3162         struct discard_policy dpolicy;
3163         unsigned long long trimmed = 0;
3164         int err = 0;
3165         bool need_align = f2fs_lfs_mode(sbi) && __is_large_section(sbi);
3166
3167         if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
3168                 return -EINVAL;
3169
3170         if (end < MAIN_BLKADDR(sbi))
3171                 goto out;
3172
3173         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
3174                 f2fs_warn(sbi, "Found FS corruption, run fsck to fix.");
3175                 return -EFSCORRUPTED;
3176         }
3177
3178         /* start/end segment number in main_area */
3179         start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
3180         end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
3181                                                 GET_SEGNO(sbi, end);
3182         if (need_align) {
3183                 start_segno = rounddown(start_segno, sbi->segs_per_sec);
3184                 end_segno = roundup(end_segno + 1, sbi->segs_per_sec) - 1;
3185         }
3186
3187         cpc.reason = CP_DISCARD;
3188         cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
3189         cpc.trim_start = start_segno;
3190         cpc.trim_end = end_segno;
3191
3192         if (sbi->discard_blks == 0)
3193                 goto out;
3194
3195         down_write(&sbi->gc_lock);
3196         err = f2fs_write_checkpoint(sbi, &cpc);
3197         up_write(&sbi->gc_lock);
3198         if (err)
3199                 goto out;
3200
3201         /*
3202          * We filed discard candidates, but actually we don't need to wait for
3203          * all of them, since they'll be issued in idle time along with runtime
3204          * discard option. User configuration looks like using runtime discard
3205          * or periodic fstrim instead of it.
3206          */
3207         if (f2fs_realtime_discard_enable(sbi))
3208                 goto out;
3209
3210         start_block = START_BLOCK(sbi, start_segno);
3211         end_block = START_BLOCK(sbi, end_segno + 1);
3212
3213         __init_discard_policy(sbi, &dpolicy, DPOLICY_FSTRIM, cpc.trim_minlen);
3214         trimmed = __issue_discard_cmd_range(sbi, &dpolicy,
3215                                         start_block, end_block);
3216
3217         trimmed += __wait_discard_cmd_range(sbi, &dpolicy,
3218                                         start_block, end_block);
3219 out:
3220         if (!err)
3221                 range->len = F2FS_BLK_TO_BYTES(trimmed);
3222         return err;
3223 }
3224
3225 static bool __has_curseg_space(struct f2fs_sb_info *sbi,
3226                                         struct curseg_info *curseg)
3227 {
3228         return curseg->next_blkoff < f2fs_usable_blks_in_seg(sbi,
3229                                                         curseg->segno);
3230 }
3231
3232 int f2fs_rw_hint_to_seg_type(enum rw_hint hint)
3233 {
3234         switch (hint) {
3235         case WRITE_LIFE_SHORT:
3236                 return CURSEG_HOT_DATA;
3237         case WRITE_LIFE_EXTREME:
3238                 return CURSEG_COLD_DATA;
3239         default:
3240                 return CURSEG_WARM_DATA;
3241         }
3242 }
3243
3244 /* This returns write hints for each segment type. This hints will be
3245  * passed down to block layer. There are mapping tables which depend on
3246  * the mount option 'whint_mode'.
3247  *
3248  * 1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.
3249  *
3250  * 2) whint_mode=user-based. F2FS tries to pass down hints given by users.
3251  *
3252  * User                  F2FS                     Block
3253  * ----                  ----                     -----
3254  *                       META                     WRITE_LIFE_NOT_SET
3255  *                       HOT_NODE                 "
3256  *                       WARM_NODE                "
3257  *                       COLD_NODE                "
3258  * ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
3259  * extension list        "                        "
3260  *
3261  * -- buffered io
3262  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
3263  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
3264  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
3265  * WRITE_LIFE_NONE       "                        "
3266  * WRITE_LIFE_MEDIUM     "                        "
3267  * WRITE_LIFE_LONG       "                        "
3268  *
3269  * -- direct io
3270  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
3271  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
3272  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
3273  * WRITE_LIFE_NONE       "                        WRITE_LIFE_NONE
3274  * WRITE_LIFE_MEDIUM     "                        WRITE_LIFE_MEDIUM
3275  * WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG
3276  *
3277  * 3) whint_mode=fs-based. F2FS passes down hints with its policy.
3278  *
3279  * User                  F2FS                     Block
3280  * ----                  ----                     -----
3281  *                       META                     WRITE_LIFE_MEDIUM;
3282  *                       HOT_NODE                 WRITE_LIFE_NOT_SET
3283  *                       WARM_NODE                "
3284  *                       COLD_NODE                WRITE_LIFE_NONE
3285  * ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
3286  * extension list        "                        "
3287  *
3288  * -- buffered io
3289  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
3290  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
3291  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_LONG
3292  * WRITE_LIFE_NONE       "                        "
3293  * WRITE_LIFE_MEDIUM     "                        "
3294  * WRITE_LIFE_LONG       "                        "
3295  *
3296  * -- direct io
3297  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
3298  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
3299  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
3300  * WRITE_LIFE_NONE       "                        WRITE_LIFE_NONE
3301  * WRITE_LIFE_MEDIUM     "                        WRITE_LIFE_MEDIUM
3302  * WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG
3303  */
3304
3305 enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
3306                                 enum page_type type, enum temp_type temp)
3307 {
3308         if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_USER) {
3309                 if (type == DATA) {
3310                         if (temp == WARM)
3311                                 return WRITE_LIFE_NOT_SET;
3312                         else if (temp == HOT)
3313                                 return WRITE_LIFE_SHORT;
3314                         else if (temp == COLD)
3315                                 return WRITE_LIFE_EXTREME;
3316                 } else {
3317                         return WRITE_LIFE_NOT_SET;
3318                 }
3319         } else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS) {
3320                 if (type == DATA) {
3321                         if (temp == WARM)
3322                                 return WRITE_LIFE_LONG;
3323                         else if (temp == HOT)
3324                                 return WRITE_LIFE_SHORT;
3325                         else if (temp == COLD)
3326                                 return WRITE_LIFE_EXTREME;
3327                 } else if (type == NODE) {
3328                         if (temp == WARM || temp == HOT)
3329                                 return WRITE_LIFE_NOT_SET;
3330                         else if (temp == COLD)
3331                                 return WRITE_LIFE_NONE;
3332                 } else if (type == META) {
3333                         return WRITE_LIFE_MEDIUM;
3334                 }
3335         }
3336         return WRITE_LIFE_NOT_SET;
3337 }
3338
3339 static int __get_segment_type_2(struct f2fs_io_info *fio)
3340 {
3341         if (fio->type == DATA)
3342                 return CURSEG_HOT_DATA;
3343         else
3344                 return CURSEG_HOT_NODE;
3345 }
3346
3347 static int __get_segment_type_4(struct f2fs_io_info *fio)
3348 {
3349         if (fio->type == DATA) {
3350                 struct inode *inode = fio->page->mapping->host;
3351
3352                 if (S_ISDIR(inode->i_mode))
3353                         return CURSEG_HOT_DATA;
3354                 else
3355                         return CURSEG_COLD_DATA;
3356         } else {
3357                 if (IS_DNODE(fio->page) && is_cold_node(fio->page))
3358                         return CURSEG_WARM_NODE;
3359                 else
3360                         return CURSEG_COLD_NODE;
3361         }
3362 }
3363
3364 static int __get_segment_type_6(struct f2fs_io_info *fio)
3365 {
3366         if (fio->type == DATA) {
3367                 struct inode *inode = fio->page->mapping->host;
3368
3369                 if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
3370                         return CURSEG_COLD_DATA_PINNED;
3371
3372                 if (page_private_gcing(fio->page)) {
3373                         if (fio->sbi->am.atgc_enabled &&
3374                                 (fio->io_type == FS_DATA_IO) &&
3375                                 (fio->sbi->gc_mode != GC_URGENT_HIGH))
3376                                 return CURSEG_ALL_DATA_ATGC;
3377                         else
3378                                 return CURSEG_COLD_DATA;
3379                 }
3380                 if (file_is_cold(inode) || f2fs_need_compress_data(inode))
3381                         return CURSEG_COLD_DATA;
3382                 if (file_is_hot(inode) ||
3383                                 is_inode_flag_set(inode, FI_HOT_DATA) ||
3384                                 f2fs_is_atomic_file(inode) ||
3385                                 f2fs_is_volatile_file(inode))
3386                         return CURSEG_HOT_DATA;
3387                 return f2fs_rw_hint_to_seg_type(inode->i_write_hint);
3388         } else {
3389                 if (IS_DNODE(fio->page))
3390                         return is_cold_node(fio->page) ? CURSEG_WARM_NODE :
3391                                                 CURSEG_HOT_NODE;
3392                 return CURSEG_COLD_NODE;
3393         }
3394 }
3395
3396 static int __get_segment_type(struct f2fs_io_info *fio)
3397 {
3398         int type = 0;
3399
3400         switch (F2FS_OPTION(fio->sbi).active_logs) {
3401         case 2:
3402                 type = __get_segment_type_2(fio);
3403                 break;
3404         case 4:
3405                 type = __get_segment_type_4(fio);
3406                 break;
3407         case 6:
3408                 type = __get_segment_type_6(fio);
3409                 break;
3410         default:
3411                 f2fs_bug_on(fio->sbi, true);
3412         }
3413
3414         if (IS_HOT(type))
3415                 fio->temp = HOT;
3416         else if (IS_WARM(type))
3417                 fio->temp = WARM;
3418         else
3419                 fio->temp = COLD;
3420         return type;
3421 }
3422
3423 void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
3424                 block_t old_blkaddr, block_t *new_blkaddr,
3425                 struct f2fs_summary *sum, int type,
3426                 struct f2fs_io_info *fio)
3427 {
3428         struct sit_info *sit_i = SIT_I(sbi);
3429         struct curseg_info *curseg = CURSEG_I(sbi, type);
3430         unsigned long long old_mtime;
3431         bool from_gc = (type == CURSEG_ALL_DATA_ATGC);
3432         struct seg_entry *se = NULL;
3433
3434         down_read(&SM_I(sbi)->curseg_lock);
3435
3436         mutex_lock(&curseg->curseg_mutex);
3437         down_write(&sit_i->sentry_lock);
3438
3439         if (from_gc) {
3440                 f2fs_bug_on(sbi, GET_SEGNO(sbi, old_blkaddr) == NULL_SEGNO);
3441                 se = get_seg_entry(sbi, GET_SEGNO(sbi, old_blkaddr));
3442                 sanity_check_seg_type(sbi, se->type);
3443                 f2fs_bug_on(sbi, IS_NODESEG(se->type));
3444         }
3445         *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
3446
3447         f2fs_bug_on(sbi, curseg->next_blkoff >= sbi->blocks_per_seg);
3448
3449         f2fs_wait_discard_bio(sbi, *new_blkaddr);
3450
3451         /*
3452          * __add_sum_entry should be resided under the curseg_mutex
3453          * because, this function updates a summary entry in the
3454          * current summary block.
3455          */
3456         __add_sum_entry(sbi, type, sum);
3457
3458         __refresh_next_blkoff(sbi, curseg);
3459
3460         stat_inc_block_count(sbi, curseg);
3461
3462         if (from_gc) {
3463                 old_mtime = get_segment_mtime(sbi, old_blkaddr);
3464         } else {
3465                 update_segment_mtime(sbi, old_blkaddr, 0);
3466                 old_mtime = 0;
3467         }
3468         update_segment_mtime(sbi, *new_blkaddr, old_mtime);
3469
3470         /*
3471          * SIT information should be updated before segment allocation,
3472          * since SSR needs latest valid block information.
3473          */
3474         update_sit_entry(sbi, *new_blkaddr, 1);
3475         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
3476                 update_sit_entry(sbi, old_blkaddr, -1);
3477
3478         if (!__has_curseg_space(sbi, curseg)) {
3479                 if (from_gc)
3480                         get_atssr_segment(sbi, type, se->type,
3481                                                 AT_SSR, se->mtime);
3482                 else
3483                         sit_i->s_ops->allocate_segment(sbi, type, false);
3484         }
3485         /*
3486          * segment dirty status should be updated after segment allocation,
3487          * so we just need to update status only one time after previous
3488          * segment being closed.
3489          */
3490         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
3491         locate_dirty_segment(sbi, GET_SEGNO(sbi, *new_blkaddr));
3492
3493         up_write(&sit_i->sentry_lock);
3494
3495         if (page && IS_NODESEG(type)) {
3496                 fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
3497
3498                 f2fs_inode_chksum_set(sbi, page);
3499         }
3500
3501         if (fio) {
3502                 struct f2fs_bio_info *io;
3503
3504                 if (F2FS_IO_ALIGNED(sbi))
3505                         fio->retry = false;
3506
3507                 INIT_LIST_HEAD(&fio->list);
3508                 fio->in_list = true;
3509                 io = sbi->write_io[fio->type] + fio->temp;
3510                 spin_lock(&io->io_lock);
3511                 list_add_tail(&fio->list, &io->io_list);
3512                 spin_unlock(&io->io_lock);
3513         }
3514
3515         mutex_unlock(&curseg->curseg_mutex);
3516
3517         up_read(&SM_I(sbi)->curseg_lock);
3518 }
3519
3520 void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
3521                                         block_t blkaddr, unsigned int blkcnt)
3522 {
3523         if (!f2fs_is_multi_device(sbi))
3524                 return;
3525
3526         while (1) {
3527                 unsigned int devidx = f2fs_target_device_index(sbi, blkaddr);
3528                 unsigned int blks = FDEV(devidx).end_blk - blkaddr + 1;
3529
3530                 /* update device state for fsync */
3531                 f2fs_set_dirty_device(sbi, ino, devidx, FLUSH_INO);
3532
3533                 /* update device state for checkpoint */
3534                 if (!f2fs_test_bit(devidx, (char *)&sbi->dirty_device)) {
3535                         spin_lock(&sbi->dev_lock);
3536                         f2fs_set_bit(devidx, (char *)&sbi->dirty_device);
3537                         spin_unlock(&sbi->dev_lock);
3538                 }
3539
3540                 if (blkcnt <= blks)
3541                         break;
3542                 blkcnt -= blks;
3543                 blkaddr += blks;
3544         }
3545 }
3546
3547 static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
3548 {
3549         int type = __get_segment_type(fio);
3550         bool keep_order = (f2fs_lfs_mode(fio->sbi) && type == CURSEG_COLD_DATA);
3551
3552         if (keep_order)
3553                 down_read(&fio->sbi->io_order_lock);
3554 reallocate:
3555         f2fs_allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
3556                         &fio->new_blkaddr, sum, type, fio);
3557         if (GET_SEGNO(fio->sbi, fio->old_blkaddr) != NULL_SEGNO) {
3558                 invalidate_mapping_pages(META_MAPPING(fio->sbi),
3559                                         fio->old_blkaddr, fio->old_blkaddr);
3560                 f2fs_invalidate_compress_page(fio->sbi, fio->old_blkaddr);
3561         }
3562
3563         /* writeout dirty page into bdev */
3564         f2fs_submit_page_write(fio);
3565         if (fio->retry) {
3566                 fio->old_blkaddr = fio->new_blkaddr;
3567                 goto reallocate;
3568         }
3569
3570         f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr, 1);
3571
3572         if (keep_order)
3573                 up_read(&fio->sbi->io_order_lock);
3574 }
3575
3576 void f2fs_do_write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
3577                                         enum iostat_type io_type)
3578 {
3579         struct f2fs_io_info fio = {
3580                 .sbi = sbi,
3581                 .type = META,
3582                 .temp = HOT,
3583                 .op = REQ_OP_WRITE,
3584                 .op_flags = REQ_SYNC | REQ_META | REQ_PRIO,
3585                 .old_blkaddr = page->index,
3586                 .new_blkaddr = page->index,
3587                 .page = page,
3588                 .encrypted_page = NULL,
3589                 .in_list = false,
3590         };
3591
3592         if (unlikely(page->index >= MAIN_BLKADDR(sbi)))
3593                 fio.op_flags &= ~REQ_META;
3594
3595         set_page_writeback(page);
3596         ClearPageError(page);
3597         f2fs_submit_page_write(&fio);
3598
3599         stat_inc_meta_count(sbi, page->index);
3600         f2fs_update_iostat(sbi, io_type, F2FS_BLKSIZE);
3601 }
3602
3603 void f2fs_do_write_node_page(unsigned int nid, struct f2fs_io_info *fio)
3604 {
3605         struct f2fs_summary sum;
3606
3607         set_summary(&sum, nid, 0, 0);
3608         do_write_page(&sum, fio);
3609
3610         f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
3611 }
3612
3613 void f2fs_outplace_write_data(struct dnode_of_data *dn,
3614                                         struct f2fs_io_info *fio)
3615 {
3616         struct f2fs_sb_info *sbi = fio->sbi;
3617         struct f2fs_summary sum;
3618
3619         f2fs_bug_on(sbi, dn->data_blkaddr == NULL_ADDR);
3620         set_summary(&sum, dn->nid, dn->ofs_in_node, fio->version);
3621         do_write_page(&sum, fio);
3622         f2fs_update_data_blkaddr(dn, fio->new_blkaddr);
3623
3624         f2fs_update_iostat(sbi, fio->io_type, F2FS_BLKSIZE);
3625 }
3626
3627 int f2fs_inplace_write_data(struct f2fs_io_info *fio)
3628 {
3629         int err;
3630         struct f2fs_sb_info *sbi = fio->sbi;
3631         unsigned int segno;
3632
3633         fio->new_blkaddr = fio->old_blkaddr;
3634         /* i/o temperature is needed for passing down write hints */
3635         __get_segment_type(fio);
3636
3637         segno = GET_SEGNO(sbi, fio->new_blkaddr);
3638
3639         if (!IS_DATASEG(get_seg_entry(sbi, segno)->type)) {
3640                 set_sbi_flag(sbi, SBI_NEED_FSCK);
3641                 f2fs_warn(sbi, "%s: incorrect segment(%u) type, run fsck to fix.",
3642                           __func__, segno);
3643                 err = -EFSCORRUPTED;
3644                 goto drop_bio;
3645         }
3646
3647         if (f2fs_cp_error(sbi)) {
3648                 err = -EIO;
3649                 goto drop_bio;
3650         }
3651
3652         invalidate_mapping_pages(META_MAPPING(sbi),
3653                                 fio->new_blkaddr, fio->new_blkaddr);
3654
3655         stat_inc_inplace_blocks(fio->sbi);
3656
3657         if (fio->bio && !(SM_I(sbi)->ipu_policy & (1 << F2FS_IPU_NOCACHE)))
3658                 err = f2fs_merge_page_bio(fio);
3659         else
3660                 err = f2fs_submit_page_bio(fio);
3661         if (!err) {
3662                 f2fs_update_device_state(fio->sbi, fio->ino,
3663                                                 fio->new_blkaddr, 1);
3664                 f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
3665         }
3666
3667         return err;
3668 drop_bio:
3669         if (fio->bio && *(fio->bio)) {
3670                 struct bio *bio = *(fio->bio);
3671
3672                 bio->bi_status = BLK_STS_IOERR;
3673                 bio_endio(bio);
3674                 *(fio->bio) = NULL;
3675         }
3676         return err;
3677 }
3678
3679 static inline int __f2fs_get_curseg(struct f2fs_sb_info *sbi,
3680                                                 unsigned int segno)
3681 {
3682         int i;
3683
3684         for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
3685                 if (CURSEG_I(sbi, i)->segno == segno)
3686                         break;
3687         }
3688         return i;
3689 }
3690
3691 void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
3692                                 block_t old_blkaddr, block_t new_blkaddr,
3693                                 bool recover_curseg, bool recover_newaddr,
3694                                 bool from_gc)
3695 {
3696         struct sit_info *sit_i = SIT_I(sbi);
3697         struct curseg_info *curseg;
3698         unsigned int segno, old_cursegno;
3699         struct seg_entry *se;
3700         int type;
3701         unsigned short old_blkoff;
3702         unsigned char old_alloc_type;
3703
3704         segno = GET_SEGNO(sbi, new_blkaddr);
3705         se = get_seg_entry(sbi, segno);
3706         type = se->type;
3707
3708         down_write(&SM_I(sbi)->curseg_lock);
3709
3710         if (!recover_curseg) {
3711                 /* for recovery flow */
3712                 if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
3713                         if (old_blkaddr == NULL_ADDR)
3714                                 type = CURSEG_COLD_DATA;
3715                         else
3716                                 type = CURSEG_WARM_DATA;
3717                 }
3718         } else {
3719                 if (IS_CURSEG(sbi, segno)) {
3720                         /* se->type is volatile as SSR allocation */
3721                         type = __f2fs_get_curseg(sbi, segno);
3722                         f2fs_bug_on(sbi, type == NO_CHECK_TYPE);
3723                 } else {
3724                         type = CURSEG_WARM_DATA;
3725                 }
3726         }
3727
3728         f2fs_bug_on(sbi, !IS_DATASEG(type));
3729         curseg = CURSEG_I(sbi, type);
3730
3731         mutex_lock(&curseg->curseg_mutex);
3732         down_write(&sit_i->sentry_lock);
3733
3734         old_cursegno = curseg->segno;
3735         old_blkoff = curseg->next_blkoff;
3736         old_alloc_type = curseg->alloc_type;
3737
3738         /* change the current segment */
3739         if (segno != curseg->segno) {
3740                 curseg->next_segno = segno;
3741                 change_curseg(sbi, type, true);
3742         }
3743
3744         curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
3745         __add_sum_entry(sbi, type, sum);
3746
3747         if (!recover_curseg || recover_newaddr) {
3748                 if (!from_gc)
3749                         update_segment_mtime(sbi, new_blkaddr, 0);
3750                 update_sit_entry(sbi, new_blkaddr, 1);
3751         }
3752         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) {
3753                 invalidate_mapping_pages(META_MAPPING(sbi),
3754                                         old_blkaddr, old_blkaddr);
3755                 f2fs_invalidate_compress_page(sbi, old_blkaddr);
3756                 if (!from_gc)
3757                         update_segment_mtime(sbi, old_blkaddr, 0);
3758                 update_sit_entry(sbi, old_blkaddr, -1);
3759         }
3760
3761         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
3762         locate_dirty_segment(sbi, GET_SEGNO(sbi, new_blkaddr));
3763
3764         locate_dirty_segment(sbi, old_cursegno);
3765
3766         if (recover_curseg) {
3767                 if (old_cursegno != curseg->segno) {
3768                         curseg->next_segno = old_cursegno;
3769                         change_curseg(sbi, type, true);
3770                 }
3771                 curseg->next_blkoff = old_blkoff;
3772                 curseg->alloc_type = old_alloc_type;
3773         }
3774
3775         up_write(&sit_i->sentry_lock);
3776         mutex_unlock(&curseg->curseg_mutex);
3777         up_write(&SM_I(sbi)->curseg_lock);
3778 }
3779
3780 void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
3781                                 block_t old_addr, block_t new_addr,
3782                                 unsigned char version, bool recover_curseg,
3783                                 bool recover_newaddr)
3784 {
3785         struct f2fs_summary sum;
3786
3787         set_summary(&sum, dn->nid, dn->ofs_in_node, version);
3788
3789         f2fs_do_replace_block(sbi, &sum, old_addr, new_addr,
3790                                         recover_curseg, recover_newaddr, false);
3791
3792         f2fs_update_data_blkaddr(dn, new_addr);
3793 }
3794
3795 void f2fs_wait_on_page_writeback(struct page *page,
3796                                 enum page_type type, bool ordered, bool locked)
3797 {
3798         if (PageWriteback(page)) {
3799                 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
3800
3801                 /* submit cached LFS IO */
3802                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, type);
3803                 /* sbumit cached IPU IO */
3804                 f2fs_submit_merged_ipu_write(sbi, NULL, page);
3805                 if (ordered) {
3806                         wait_on_page_writeback(page);
3807                         f2fs_bug_on(sbi, locked && PageWriteback(page));
3808                 } else {
3809                         wait_for_stable_page(page);
3810                 }
3811         }
3812 }
3813
3814 void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr)
3815 {
3816         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
3817         struct page *cpage;
3818
3819         if (!f2fs_post_read_required(inode))
3820                 return;
3821
3822         if (!__is_valid_data_blkaddr(blkaddr))
3823                 return;
3824
3825         cpage = find_lock_page(META_MAPPING(sbi), blkaddr);
3826         if (cpage) {
3827                 f2fs_wait_on_page_writeback(cpage, DATA, true, true);
3828                 f2fs_put_page(cpage, 1);
3829         }
3830 }
3831
3832 void f2fs_wait_on_block_writeback_range(struct inode *inode, block_t blkaddr,
3833                                                                 block_t len)
3834 {
3835         block_t i;
3836
3837         for (i = 0; i < len; i++)
3838                 f2fs_wait_on_block_writeback(inode, blkaddr + i);
3839 }
3840
3841 static int read_compacted_summaries(struct f2fs_sb_info *sbi)
3842 {
3843         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
3844         struct curseg_info *seg_i;
3845         unsigned char *kaddr;
3846         struct page *page;
3847         block_t start;
3848         int i, j, offset;
3849
3850         start = start_sum_block(sbi);
3851
3852         page = f2fs_get_meta_page(sbi, start++);
3853         if (IS_ERR(page))
3854                 return PTR_ERR(page);
3855         kaddr = (unsigned char *)page_address(page);
3856
3857         /* Step 1: restore nat cache */
3858         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
3859         memcpy(seg_i->journal, kaddr, SUM_JOURNAL_SIZE);
3860
3861         /* Step 2: restore sit cache */
3862         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
3863         memcpy(seg_i->journal, kaddr + SUM_JOURNAL_SIZE, SUM_JOURNAL_SIZE);
3864         offset = 2 * SUM_JOURNAL_SIZE;
3865
3866         /* Step 3: restore summary entries */
3867         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
3868                 unsigned short blk_off;
3869                 unsigned int segno;
3870
3871                 seg_i = CURSEG_I(sbi, i);
3872                 segno = le32_to_cpu(ckpt->cur_data_segno[i]);
3873                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
3874                 seg_i->next_segno = segno;
3875                 reset_curseg(sbi, i, 0);
3876                 seg_i->alloc_type = ckpt->alloc_type[i];
3877                 seg_i->next_blkoff = blk_off;
3878
3879                 if (seg_i->alloc_type == SSR)
3880                         blk_off = sbi->blocks_per_seg;
3881
3882                 for (j = 0; j < blk_off; j++) {
3883                         struct f2fs_summary *s;
3884
3885                         s = (struct f2fs_summary *)(kaddr + offset);
3886                         seg_i->sum_blk->entries[j] = *s;
3887                         offset += SUMMARY_SIZE;
3888                         if (offset + SUMMARY_SIZE <= PAGE_SIZE -
3889                                                 SUM_FOOTER_SIZE)
3890                                 continue;
3891
3892                         f2fs_put_page(page, 1);
3893                         page = NULL;
3894
3895                         page = f2fs_get_meta_page(sbi, start++);
3896                         if (IS_ERR(page))
3897                                 return PTR_ERR(page);
3898                         kaddr = (unsigned char *)page_address(page);
3899                         offset = 0;
3900                 }
3901         }
3902         f2fs_put_page(page, 1);
3903         return 0;
3904 }
3905
3906 static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
3907 {
3908         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
3909         struct f2fs_summary_block *sum;
3910         struct curseg_info *curseg;
3911         struct page *new;
3912         unsigned short blk_off;
3913         unsigned int segno = 0;
3914         block_t blk_addr = 0;
3915         int err = 0;
3916
3917         /* get segment number and block addr */
3918         if (IS_DATASEG(type)) {
3919                 segno = le32_to_cpu(ckpt->cur_data_segno[type]);
3920                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
3921                                                         CURSEG_HOT_DATA]);
3922                 if (__exist_node_summaries(sbi))
3923                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type);
3924                 else
3925                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
3926         } else {
3927                 segno = le32_to_cpu(ckpt->cur_node_segno[type -
3928                                                         CURSEG_HOT_NODE]);
3929                 blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
3930                                                         CURSEG_HOT_NODE]);
3931                 if (__exist_node_summaries(sbi))
3932                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
3933                                                         type - CURSEG_HOT_NODE);
3934                 else
3935                         blk_addr = GET_SUM_BLOCK(sbi, segno);
3936         }
3937
3938         new = f2fs_get_meta_page(sbi, blk_addr);
3939         if (IS_ERR(new))
3940                 return PTR_ERR(new);
3941         sum = (struct f2fs_summary_block *)page_address(new);
3942
3943         if (IS_NODESEG(type)) {
3944                 if (__exist_node_summaries(sbi)) {
3945                         struct f2fs_summary *ns = &sum->entries[0];
3946                         int i;
3947
3948                         for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
3949                                 ns->version = 0;
3950                                 ns->ofs_in_node = 0;
3951                         }
3952                 } else {
3953                         err = f2fs_restore_node_summary(sbi, segno, sum);
3954                         if (err)
3955                                 goto out;
3956                 }
3957         }
3958
3959         /* set uncompleted segment to curseg */
3960         curseg = CURSEG_I(sbi, type);
3961         mutex_lock(&curseg->curseg_mutex);
3962
3963         /* update journal info */
3964         down_write(&curseg->journal_rwsem);
3965         memcpy(curseg->journal, &sum->journal, SUM_JOURNAL_SIZE);
3966         up_write(&curseg->journal_rwsem);
3967
3968         memcpy(curseg->sum_blk->entries, sum->entries, SUM_ENTRY_SIZE);
3969         memcpy(&curseg->sum_blk->footer, &sum->footer, SUM_FOOTER_SIZE);
3970         curseg->next_segno = segno;
3971         reset_curseg(sbi, type, 0);
3972         curseg->alloc_type = ckpt->alloc_type[type];
3973         curseg->next_blkoff = blk_off;
3974         mutex_unlock(&curseg->curseg_mutex);
3975 out:
3976         f2fs_put_page(new, 1);
3977         return err;
3978 }
3979
3980 static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
3981 {
3982         struct f2fs_journal *sit_j = CURSEG_I(sbi, CURSEG_COLD_DATA)->journal;
3983         struct f2fs_journal *nat_j = CURSEG_I(sbi, CURSEG_HOT_DATA)->journal;
3984         int type = CURSEG_HOT_DATA;
3985         int err;
3986
3987         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) {
3988                 int npages = f2fs_npages_for_summary_flush(sbi, true);
3989
3990                 if (npages >= 2)
3991                         f2fs_ra_meta_pages(sbi, start_sum_block(sbi), npages,
3992                                                         META_CP, true);
3993
3994                 /* restore for compacted data summary */
3995                 err = read_compacted_summaries(sbi);
3996                 if (err)
3997                         return err;
3998                 type = CURSEG_HOT_NODE;
3999         }
4000
4001         if (__exist_node_summaries(sbi))
4002                 f2fs_ra_meta_pages(sbi,
4003                                 sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type),
4004                                 NR_CURSEG_PERSIST_TYPE - type, META_CP, true);
4005
4006         for (; type <= CURSEG_COLD_NODE; type++) {
4007                 err = read_normal_summaries(sbi, type);
4008                 if (err)
4009                         return err;
4010         }
4011
4012         /* sanity check for summary blocks */
4013         if (nats_in_cursum(nat_j) > NAT_JOURNAL_ENTRIES ||
4014                         sits_in_cursum(sit_j) > SIT_JOURNAL_ENTRIES) {
4015                 f2fs_err(sbi, "invalid journal entries nats %u sits %u",
4016                          nats_in_cursum(nat_j), sits_in_cursum(sit_j));
4017                 return -EINVAL;
4018         }
4019
4020         return 0;
4021 }
4022
4023 static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
4024 {
4025         struct page *page;
4026         unsigned char *kaddr;
4027         struct f2fs_summary *summary;
4028         struct curseg_info *seg_i;
4029         int written_size = 0;
4030         int i, j;
4031
4032         page = f2fs_grab_meta_page(sbi, blkaddr++);
4033         kaddr = (unsigned char *)page_address(page);
4034         memset(kaddr, 0, PAGE_SIZE);
4035
4036         /* Step 1: write nat cache */
4037         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
4038         memcpy(kaddr, seg_i->journal, SUM_JOURNAL_SIZE);
4039         written_size += SUM_JOURNAL_SIZE;
4040
4041         /* Step 2: write sit cache */
4042         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
4043         memcpy(kaddr + written_size, seg_i->journal, SUM_JOURNAL_SIZE);
4044         written_size += SUM_JOURNAL_SIZE;
4045
4046         /* Step 3: write summary entries */
4047         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
4048                 unsigned short blkoff;
4049
4050                 seg_i = CURSEG_I(sbi, i);
4051                 if (sbi->ckpt->alloc_type[i] == SSR)
4052                         blkoff = sbi->blocks_per_seg;
4053                 else
4054                         blkoff = curseg_blkoff(sbi, i);
4055
4056                 for (j = 0; j < blkoff; j++) {
4057                         if (!page) {
4058                                 page = f2fs_grab_meta_page(sbi, blkaddr++);
4059                                 kaddr = (unsigned char *)page_address(page);
4060                                 memset(kaddr, 0, PAGE_SIZE);
4061                                 written_size = 0;
4062                         }
4063                         summary = (struct f2fs_summary *)(kaddr + written_size);
4064                         *summary = seg_i->sum_blk->entries[j];
4065                         written_size += SUMMARY_SIZE;
4066
4067                         if (written_size + SUMMARY_SIZE <= PAGE_SIZE -
4068                                                         SUM_FOOTER_SIZE)
4069                                 continue;
4070
4071                         set_page_dirty(page);
4072                         f2fs_put_page(page, 1);
4073                         page = NULL;
4074                 }
4075         }
4076         if (page) {
4077                 set_page_dirty(page);
4078                 f2fs_put_page(page, 1);
4079         }
4080 }
4081
4082 static void write_normal_summaries(struct f2fs_sb_info *sbi,
4083                                         block_t blkaddr, int type)
4084 {
4085         int i, end;
4086
4087         if (IS_DATASEG(type))
4088                 end = type + NR_CURSEG_DATA_TYPE;
4089         else
4090                 end = type + NR_CURSEG_NODE_TYPE;
4091
4092         for (i = type; i < end; i++)
4093                 write_current_sum_page(sbi, i, blkaddr + (i - type));
4094 }
4095
4096 void f2fs_write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
4097 {
4098         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG))
4099                 write_compacted_summaries(sbi, start_blk);
4100         else
4101                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
4102 }
4103
4104 void f2fs_write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
4105 {
4106         write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
4107 }
4108
4109 int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
4110                                         unsigned int val, int alloc)
4111 {
4112         int i;
4113
4114         if (type == NAT_JOURNAL) {
4115                 for (i = 0; i < nats_in_cursum(journal); i++) {
4116                         if (le32_to_cpu(nid_in_journal(journal, i)) == val)
4117                                 return i;
4118                 }
4119                 if (alloc && __has_cursum_space(journal, 1, NAT_JOURNAL))
4120                         return update_nats_in_cursum(journal, 1);
4121         } else if (type == SIT_JOURNAL) {
4122                 for (i = 0; i < sits_in_cursum(journal); i++)
4123                         if (le32_to_cpu(segno_in_journal(journal, i)) == val)
4124                                 return i;
4125                 if (alloc && __has_cursum_space(journal, 1, SIT_JOURNAL))
4126                         return update_sits_in_cursum(journal, 1);
4127         }
4128         return -1;
4129 }
4130
4131 static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
4132                                         unsigned int segno)
4133 {
4134         return f2fs_get_meta_page(sbi, current_sit_addr(sbi, segno));
4135 }
4136
4137 static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
4138                                         unsigned int start)
4139 {
4140         struct sit_info *sit_i = SIT_I(sbi);
4141         struct page *page;
4142         pgoff_t src_off, dst_off;
4143
4144         src_off = current_sit_addr(sbi, start);
4145         dst_off = next_sit_addr(sbi, src_off);
4146
4147         page = f2fs_grab_meta_page(sbi, dst_off);
4148         seg_info_to_sit_page(sbi, page, start);
4149
4150         set_page_dirty(page);
4151         set_to_next_sit(sit_i, start);
4152
4153         return page;
4154 }
4155
4156 static struct sit_entry_set *grab_sit_entry_set(void)
4157 {
4158         struct sit_entry_set *ses =
4159                         f2fs_kmem_cache_alloc(sit_entry_set_slab,
4160                                                 GFP_NOFS, true, NULL);
4161
4162         ses->entry_cnt = 0;
4163         INIT_LIST_HEAD(&ses->set_list);
4164         return ses;
4165 }
4166
4167 static void release_sit_entry_set(struct sit_entry_set *ses)
4168 {
4169         list_del(&ses->set_list);
4170         kmem_cache_free(sit_entry_set_slab, ses);
4171 }
4172
4173 static void adjust_sit_entry_set(struct sit_entry_set *ses,
4174                                                 struct list_head *head)
4175 {
4176         struct sit_entry_set *next = ses;
4177
4178         if (list_is_last(&ses->set_list, head))
4179                 return;
4180
4181         list_for_each_entry_continue(next, head, set_list)
4182                 if (ses->entry_cnt <= next->entry_cnt)
4183                         break;
4184
4185         list_move_tail(&ses->set_list, &next->set_list);
4186 }
4187
4188 static void add_sit_entry(unsigned int segno, struct list_head *head)
4189 {
4190         struct sit_entry_set *ses;
4191         unsigned int start_segno = START_SEGNO(segno);
4192
4193         list_for_each_entry(ses, head, set_list) {
4194                 if (ses->start_segno == start_segno) {
4195                         ses->entry_cnt++;
4196                         adjust_sit_entry_set(ses, head);
4197                         return;
4198                 }
4199         }
4200
4201         ses = grab_sit_entry_set();
4202
4203         ses->start_segno = start_segno;
4204         ses->entry_cnt++;
4205         list_add(&ses->set_list, head);
4206 }
4207
4208 static void add_sits_in_set(struct f2fs_sb_info *sbi)
4209 {
4210         struct f2fs_sm_info *sm_info = SM_I(sbi);
4211         struct list_head *set_list = &sm_info->sit_entry_set;
4212         unsigned long *bitmap = SIT_I(sbi)->dirty_sentries_bitmap;
4213         unsigned int segno;
4214
4215         for_each_set_bit(segno, bitmap, MAIN_SEGS(sbi))
4216                 add_sit_entry(segno, set_list);
4217 }
4218
4219 static void remove_sits_in_journal(struct f2fs_sb_info *sbi)
4220 {
4221         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
4222         struct f2fs_journal *journal = curseg->journal;
4223         int i;
4224
4225         down_write(&curseg->journal_rwsem);
4226         for (i = 0; i < sits_in_cursum(journal); i++) {
4227                 unsigned int segno;
4228                 bool dirtied;
4229
4230                 segno = le32_to_cpu(segno_in_journal(journal, i));
4231                 dirtied = __mark_sit_entry_dirty(sbi, segno);
4232
4233                 if (!dirtied)
4234                         add_sit_entry(segno, &SM_I(sbi)->sit_entry_set);
4235         }
4236         update_sits_in_cursum(journal, -i);
4237         up_write(&curseg->journal_rwsem);
4238 }
4239
4240 /*
4241  * CP calls this function, which flushes SIT entries including sit_journal,
4242  * and moves prefree segs to free segs.
4243  */
4244 void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
4245 {
4246         struct sit_info *sit_i = SIT_I(sbi);
4247         unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
4248         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
4249         struct f2fs_journal *journal = curseg->journal;
4250         struct sit_entry_set *ses, *tmp;
4251         struct list_head *head = &SM_I(sbi)->sit_entry_set;
4252         bool to_journal = !is_sbi_flag_set(sbi, SBI_IS_RESIZEFS);
4253         struct seg_entry *se;
4254
4255         down_write(&sit_i->sentry_lock);
4256
4257         if (!sit_i->dirty_sentries)
4258                 goto out;
4259
4260         /*
4261          * add and account sit entries of dirty bitmap in sit entry
4262          * set temporarily
4263          */
4264         add_sits_in_set(sbi);
4265
4266         /*
4267          * if there are no enough space in journal to store dirty sit
4268          * entries, remove all entries from journal and add and account
4269          * them in sit entry set.
4270          */
4271         if (!__has_cursum_space(journal, sit_i->dirty_sentries, SIT_JOURNAL) ||
4272                                                                 !to_journal)
4273                 remove_sits_in_journal(sbi);
4274
4275         /*
4276          * there are two steps to flush sit entries:
4277          * #1, flush sit entries to journal in current cold data summary block.
4278          * #2, flush sit entries to sit page.
4279          */
4280         list_for_each_entry_safe(ses, tmp, head, set_list) {
4281                 struct page *page = NULL;
4282                 struct f2fs_sit_block *raw_sit = NULL;
4283                 unsigned int start_segno = ses->start_segno;
4284                 unsigned int end = min(start_segno + SIT_ENTRY_PER_BLOCK,
4285                                                 (unsigned long)MAIN_SEGS(sbi));
4286                 unsigned int segno = start_segno;
4287
4288                 if (to_journal &&
4289                         !__has_cursum_space(journal, ses->entry_cnt, SIT_JOURNAL))
4290                         to_journal = false;
4291
4292                 if (to_journal) {
4293                         down_write(&curseg->journal_rwsem);
4294                 } else {
4295                         page = get_next_sit_page(sbi, start_segno);
4296                         raw_sit = page_address(page);
4297                 }
4298
4299                 /* flush dirty sit entries in region of current sit set */
4300                 for_each_set_bit_from(segno, bitmap, end) {
4301                         int offset, sit_offset;
4302
4303                         se = get_seg_entry(sbi, segno);
4304 #ifdef CONFIG_F2FS_CHECK_FS
4305                         if (memcmp(se->cur_valid_map, se->cur_valid_map_mir,
4306                                                 SIT_VBLOCK_MAP_SIZE))
4307                                 f2fs_bug_on(sbi, 1);
4308 #endif
4309
4310                         /* add discard candidates */
4311                         if (!(cpc->reason & CP_DISCARD)) {
4312                                 cpc->trim_start = segno;
4313                                 add_discard_addrs(sbi, cpc, false);
4314                         }
4315
4316                         if (to_journal) {
4317                                 offset = f2fs_lookup_journal_in_cursum(journal,
4318                                                         SIT_JOURNAL, segno, 1);
4319                                 f2fs_bug_on(sbi, offset < 0);
4320                                 segno_in_journal(journal, offset) =
4321                                                         cpu_to_le32(segno);
4322                                 seg_info_to_raw_sit(se,
4323                                         &sit_in_journal(journal, offset));
4324                                 check_block_count(sbi, segno,
4325                                         &sit_in_journal(journal, offset));
4326                         } else {
4327                                 sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
4328                                 seg_info_to_raw_sit(se,
4329                                                 &raw_sit->entries[sit_offset]);
4330                                 check_block_count(sbi, segno,
4331                                                 &raw_sit->entries[sit_offset]);
4332                         }
4333
4334                         __clear_bit(segno, bitmap);
4335                         sit_i->dirty_sentries--;
4336                         ses->entry_cnt--;
4337                 }
4338
4339                 if (to_journal)
4340                         up_write(&curseg->journal_rwsem);
4341                 else
4342                         f2fs_put_page(page, 1);
4343
4344                 f2fs_bug_on(sbi, ses->entry_cnt);
4345                 release_sit_entry_set(ses);
4346         }
4347
4348         f2fs_bug_on(sbi, !list_empty(head));
4349         f2fs_bug_on(sbi, sit_i->dirty_sentries);
4350 out:
4351         if (cpc->reason & CP_DISCARD) {
4352                 __u64 trim_start = cpc->trim_start;
4353
4354                 for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++)
4355                         add_discard_addrs(sbi, cpc, false);
4356
4357                 cpc->trim_start = trim_start;
4358         }
4359         up_write(&sit_i->sentry_lock);
4360
4361         set_prefree_as_free_segments(sbi);
4362 }
4363
4364 static int build_sit_info(struct f2fs_sb_info *sbi)
4365 {
4366         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
4367         struct sit_info *sit_i;
4368         unsigned int sit_segs, start;
4369         char *src_bitmap, *bitmap;
4370         unsigned int bitmap_size, main_bitmap_size, sit_bitmap_size;
4371         unsigned int discard_map = f2fs_block_unit_discard(sbi) ? 1 : 0;
4372
4373         /* allocate memory for SIT information */
4374         sit_i = f2fs_kzalloc(sbi, sizeof(struct sit_info), GFP_KERNEL);
4375         if (!sit_i)
4376                 return -ENOMEM;
4377
4378         SM_I(sbi)->sit_info = sit_i;
4379
4380         sit_i->sentries =
4381                 f2fs_kvzalloc(sbi, array_size(sizeof(struct seg_entry),
4382                                               MAIN_SEGS(sbi)),
4383                               GFP_KERNEL);
4384         if (!sit_i->sentries)
4385                 return -ENOMEM;
4386
4387         main_bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
4388         sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(sbi, main_bitmap_size,
4389                                                                 GFP_KERNEL);
4390         if (!sit_i->dirty_sentries_bitmap)
4391                 return -ENOMEM;
4392
4393 #ifdef CONFIG_F2FS_CHECK_FS
4394         bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (3 + discard_map);
4395 #else
4396         bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (2 + discard_map);
4397 #endif
4398         sit_i->bitmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
4399         if (!sit_i->bitmap)
4400                 return -ENOMEM;
4401
4402         bitmap = sit_i->bitmap;
4403
4404         for (start = 0; start < MAIN_SEGS(sbi); start++) {
4405                 sit_i->sentries[start].cur_valid_map = bitmap;
4406                 bitmap += SIT_VBLOCK_MAP_SIZE;
4407
4408                 sit_i->sentries[start].ckpt_valid_map = bitmap;
4409                 bitmap += SIT_VBLOCK_MAP_SIZE;
4410
4411 #ifdef CONFIG_F2FS_CHECK_FS
4412                 sit_i->sentries[start].cur_valid_map_mir = bitmap;
4413                 bitmap += SIT_VBLOCK_MAP_SIZE;
4414 #endif
4415
4416                 if (discard_map) {
4417                         sit_i->sentries[start].discard_map = bitmap;
4418                         bitmap += SIT_VBLOCK_MAP_SIZE;
4419                 }
4420         }
4421
4422         sit_i->tmp_map = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
4423         if (!sit_i->tmp_map)
4424                 return -ENOMEM;
4425
4426         if (__is_large_section(sbi)) {
4427                 sit_i->sec_entries =
4428                         f2fs_kvzalloc(sbi, array_size(sizeof(struct sec_entry),
4429                                                       MAIN_SECS(sbi)),
4430                                       GFP_KERNEL);
4431                 if (!sit_i->sec_entries)
4432                         return -ENOMEM;
4433         }
4434
4435         /* get information related with SIT */
4436         sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
4437
4438         /* setup SIT bitmap from ckeckpoint pack */
4439         sit_bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
4440         src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
4441
4442         sit_i->sit_bitmap = kmemdup(src_bitmap, sit_bitmap_size, GFP_KERNEL);
4443         if (!sit_i->sit_bitmap)
4444                 return -ENOMEM;
4445
4446 #ifdef CONFIG_F2FS_CHECK_FS
4447         sit_i->sit_bitmap_mir = kmemdup(src_bitmap,
4448                                         sit_bitmap_size, GFP_KERNEL);
4449         if (!sit_i->sit_bitmap_mir)
4450                 return -ENOMEM;
4451
4452         sit_i->invalid_segmap = f2fs_kvzalloc(sbi,
4453                                         main_bitmap_size, GFP_KERNEL);
4454         if (!sit_i->invalid_segmap)
4455                 return -ENOMEM;
4456 #endif
4457
4458         /* init SIT information */
4459         sit_i->s_ops = &default_salloc_ops;
4460
4461         sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
4462         sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
4463         sit_i->written_valid_blocks = 0;
4464         sit_i->bitmap_size = sit_bitmap_size;
4465         sit_i->dirty_sentries = 0;
4466         sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
4467         sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
4468         sit_i->mounted_time = ktime_get_boottime_seconds();
4469         init_rwsem(&sit_i->sentry_lock);
4470         return 0;
4471 }
4472
4473 static int build_free_segmap(struct f2fs_sb_info *sbi)
4474 {
4475         struct free_segmap_info *free_i;
4476         unsigned int bitmap_size, sec_bitmap_size;
4477
4478         /* allocate memory for free segmap information */
4479         free_i = f2fs_kzalloc(sbi, sizeof(struct free_segmap_info), GFP_KERNEL);
4480         if (!free_i)
4481                 return -ENOMEM;
4482
4483         SM_I(sbi)->free_info = free_i;
4484
4485         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
4486         free_i->free_segmap = f2fs_kvmalloc(sbi, bitmap_size, GFP_KERNEL);
4487         if (!free_i->free_segmap)
4488                 return -ENOMEM;
4489
4490         sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
4491         free_i->free_secmap = f2fs_kvmalloc(sbi, sec_bitmap_size, GFP_KERNEL);
4492         if (!free_i->free_secmap)
4493                 return -ENOMEM;
4494
4495         /* set all segments as dirty temporarily */
4496         memset(free_i->free_segmap, 0xff, bitmap_size);
4497         memset(free_i->free_secmap, 0xff, sec_bitmap_size);
4498
4499         /* init free segmap information */
4500         free_i->start_segno = GET_SEGNO_FROM_SEG0(sbi, MAIN_BLKADDR(sbi));
4501         free_i->free_segments = 0;
4502         free_i->free_sections = 0;
4503         spin_lock_init(&free_i->segmap_lock);
4504         return 0;
4505 }
4506
4507 static int build_curseg(struct f2fs_sb_info *sbi)
4508 {
4509         struct curseg_info *array;
4510         int i;
4511
4512         array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE,
4513                                         sizeof(*array)), GFP_KERNEL);
4514         if (!array)
4515                 return -ENOMEM;
4516
4517         SM_I(sbi)->curseg_array = array;
4518
4519         for (i = 0; i < NO_CHECK_TYPE; i++) {
4520                 mutex_init(&array[i].curseg_mutex);
4521                 array[i].sum_blk = f2fs_kzalloc(sbi, PAGE_SIZE, GFP_KERNEL);
4522                 if (!array[i].sum_blk)
4523                         return -ENOMEM;
4524                 init_rwsem(&array[i].journal_rwsem);
4525                 array[i].journal = f2fs_kzalloc(sbi,
4526                                 sizeof(struct f2fs_journal), GFP_KERNEL);
4527                 if (!array[i].journal)
4528                         return -ENOMEM;
4529                 if (i < NR_PERSISTENT_LOG)
4530                         array[i].seg_type = CURSEG_HOT_DATA + i;
4531                 else if (i == CURSEG_COLD_DATA_PINNED)
4532                         array[i].seg_type = CURSEG_COLD_DATA;
4533                 else if (i == CURSEG_ALL_DATA_ATGC)
4534                         array[i].seg_type = CURSEG_COLD_DATA;
4535                 array[i].segno = NULL_SEGNO;
4536                 array[i].next_blkoff = 0;
4537                 array[i].inited = false;
4538         }
4539         return restore_curseg_summaries(sbi);
4540 }
4541
4542 static int build_sit_entries(struct f2fs_sb_info *sbi)
4543 {
4544         struct sit_info *sit_i = SIT_I(sbi);
4545         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
4546         struct f2fs_journal *journal = curseg->journal;
4547         struct seg_entry *se;
4548         struct f2fs_sit_entry sit;
4549         int sit_blk_cnt = SIT_BLK_CNT(sbi);
4550         unsigned int i, start, end;
4551         unsigned int readed, start_blk = 0;
4552         int err = 0;
4553         block_t total_node_blocks = 0;
4554
4555         do {
4556                 readed = f2fs_ra_meta_pages(sbi, start_blk, BIO_MAX_VECS,
4557                                                         META_SIT, true);
4558
4559                 start = start_blk * sit_i->sents_per_block;
4560                 end = (start_blk + readed) * sit_i->sents_per_block;
4561
4562                 for (; start < end && start < MAIN_SEGS(sbi); start++) {
4563                         struct f2fs_sit_block *sit_blk;
4564                         struct page *page;
4565
4566                         se = &sit_i->sentries[start];
4567                         page = get_current_sit_page(sbi, start);
4568                         if (IS_ERR(page))
4569                                 return PTR_ERR(page);
4570                         sit_blk = (struct f2fs_sit_block *)page_address(page);
4571                         sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
4572                         f2fs_put_page(page, 1);
4573
4574                         err = check_block_count(sbi, start, &sit);
4575                         if (err)
4576                                 return err;
4577                         seg_info_from_raw_sit(se, &sit);
4578                         if (IS_NODESEG(se->type))
4579                                 total_node_blocks += se->valid_blocks;
4580
4581                         if (f2fs_block_unit_discard(sbi)) {
4582                                 /* build discard map only one time */
4583                                 if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
4584                                         memset(se->discard_map, 0xff,
4585                                                 SIT_VBLOCK_MAP_SIZE);
4586                                 } else {
4587                                         memcpy(se->discard_map,
4588                                                 se->cur_valid_map,
4589                                                 SIT_VBLOCK_MAP_SIZE);
4590                                         sbi->discard_blks +=
4591                                                 sbi->blocks_per_seg -
4592                                                 se->valid_blocks;
4593                                 }
4594                         }
4595
4596                         if (__is_large_section(sbi))
4597                                 get_sec_entry(sbi, start)->valid_blocks +=
4598                                                         se->valid_blocks;
4599                 }
4600                 start_blk += readed;
4601         } while (start_blk < sit_blk_cnt);
4602
4603         down_read(&curseg->journal_rwsem);
4604         for (i = 0; i < sits_in_cursum(journal); i++) {
4605                 unsigned int old_valid_blocks;
4606
4607                 start = le32_to_cpu(segno_in_journal(journal, i));
4608                 if (start >= MAIN_SEGS(sbi)) {
4609                         f2fs_err(sbi, "Wrong journal entry on segno %u",
4610                                  start);
4611                         err = -EFSCORRUPTED;
4612                         break;
4613                 }
4614
4615                 se = &sit_i->sentries[start];
4616                 sit = sit_in_journal(journal, i);
4617
4618                 old_valid_blocks = se->valid_blocks;
4619                 if (IS_NODESEG(se->type))
4620                         total_node_blocks -= old_valid_blocks;
4621
4622                 err = check_block_count(sbi, start, &sit);
4623                 if (err)
4624                         break;
4625                 seg_info_from_raw_sit(se, &sit);
4626                 if (IS_NODESEG(se->type))
4627                         total_node_blocks += se->valid_blocks;
4628
4629                 if (f2fs_block_unit_discard(sbi)) {
4630                         if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
4631                                 memset(se->discard_map, 0xff, SIT_VBLOCK_MAP_SIZE);
4632                         } else {
4633                                 memcpy(se->discard_map, se->cur_valid_map,
4634                                                         SIT_VBLOCK_MAP_SIZE);
4635                                 sbi->discard_blks += old_valid_blocks;
4636                                 sbi->discard_blks -= se->valid_blocks;
4637                         }
4638                 }
4639
4640                 if (__is_large_section(sbi)) {
4641                         get_sec_entry(sbi, start)->valid_blocks +=
4642                                                         se->valid_blocks;
4643                         get_sec_entry(sbi, start)->valid_blocks -=
4644                                                         old_valid_blocks;
4645                 }
4646         }
4647         up_read(&curseg->journal_rwsem);
4648
4649         if (!err && total_node_blocks != valid_node_count(sbi)) {
4650                 f2fs_err(sbi, "SIT is corrupted node# %u vs %u",
4651                          total_node_blocks, valid_node_count(sbi));
4652                 err = -EFSCORRUPTED;
4653         }
4654
4655         return err;
4656 }
4657
4658 static void init_free_segmap(struct f2fs_sb_info *sbi)
4659 {
4660         unsigned int start;
4661         int type;
4662         struct seg_entry *sentry;
4663
4664         for (start = 0; start < MAIN_SEGS(sbi); start++) {
4665                 if (f2fs_usable_blks_in_seg(sbi, start) == 0)
4666                         continue;
4667                 sentry = get_seg_entry(sbi, start);
4668                 if (!sentry->valid_blocks)
4669                         __set_free(sbi, start);
4670                 else
4671                         SIT_I(sbi)->written_valid_blocks +=
4672                                                 sentry->valid_blocks;
4673         }
4674
4675         /* set use the current segments */
4676         for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
4677                 struct curseg_info *curseg_t = CURSEG_I(sbi, type);
4678
4679                 __set_test_and_inuse(sbi, curseg_t->segno);
4680         }
4681 }
4682
4683 static void init_dirty_segmap(struct f2fs_sb_info *sbi)
4684 {
4685         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
4686         struct free_segmap_info *free_i = FREE_I(sbi);
4687         unsigned int segno = 0, offset = 0, secno;
4688         block_t valid_blocks, usable_blks_in_seg;
4689         block_t blks_per_sec = BLKS_PER_SEC(sbi);
4690
4691         while (1) {
4692                 /* find dirty segment based on free segmap */
4693                 segno = find_next_inuse(free_i, MAIN_SEGS(sbi), offset);
4694                 if (segno >= MAIN_SEGS(sbi))
4695                         break;
4696                 offset = segno + 1;
4697                 valid_blocks = get_valid_blocks(sbi, segno, false);
4698                 usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
4699                 if (valid_blocks == usable_blks_in_seg || !valid_blocks)
4700                         continue;
4701                 if (valid_blocks > usable_blks_in_seg) {
4702                         f2fs_bug_on(sbi, 1);
4703                         continue;
4704                 }
4705                 mutex_lock(&dirty_i->seglist_lock);
4706                 __locate_dirty_segment(sbi, segno, DIRTY);
4707                 mutex_unlock(&dirty_i->seglist_lock);
4708         }
4709
4710         if (!__is_large_section(sbi))
4711                 return;
4712
4713         mutex_lock(&dirty_i->seglist_lock);
4714         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
4715                 valid_blocks = get_valid_blocks(sbi, segno, true);
4716                 secno = GET_SEC_FROM_SEG(sbi, segno);
4717
4718                 if (!valid_blocks || valid_blocks == blks_per_sec)
4719                         continue;
4720                 if (IS_CURSEC(sbi, secno))
4721                         continue;
4722                 set_bit(secno, dirty_i->dirty_secmap);
4723         }
4724         mutex_unlock(&dirty_i->seglist_lock);
4725 }
4726
4727 static int init_victim_secmap(struct f2fs_sb_info *sbi)
4728 {
4729         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
4730         unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
4731
4732         dirty_i->victim_secmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
4733         if (!dirty_i->victim_secmap)
4734                 return -ENOMEM;
4735         return 0;
4736 }
4737
4738 static int build_dirty_segmap(struct f2fs_sb_info *sbi)
4739 {
4740         struct dirty_seglist_info *dirty_i;
4741         unsigned int bitmap_size, i;
4742
4743         /* allocate memory for dirty segments list information */
4744         dirty_i = f2fs_kzalloc(sbi, sizeof(struct dirty_seglist_info),
4745                                                                 GFP_KERNEL);
4746         if (!dirty_i)
4747                 return -ENOMEM;
4748
4749         SM_I(sbi)->dirty_info = dirty_i;
4750         mutex_init(&dirty_i->seglist_lock);
4751
4752         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
4753
4754         for (i = 0; i < NR_DIRTY_TYPE; i++) {
4755                 dirty_i->dirty_segmap[i] = f2fs_kvzalloc(sbi, bitmap_size,
4756                                                                 GFP_KERNEL);
4757                 if (!dirty_i->dirty_segmap[i])
4758                         return -ENOMEM;
4759         }
4760
4761         if (__is_large_section(sbi)) {
4762                 bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
4763                 dirty_i->dirty_secmap = f2fs_kvzalloc(sbi,
4764                                                 bitmap_size, GFP_KERNEL);
4765                 if (!dirty_i->dirty_secmap)
4766                         return -ENOMEM;
4767         }
4768
4769         init_dirty_segmap(sbi);
4770         return init_victim_secmap(sbi);
4771 }
4772
4773 static int sanity_check_curseg(struct f2fs_sb_info *sbi)
4774 {
4775         int i;
4776
4777         /*
4778          * In LFS/SSR curseg, .next_blkoff should point to an unused blkaddr;
4779          * In LFS curseg, all blkaddr after .next_blkoff should be unused.
4780          */
4781         for (i = 0; i < NR_PERSISTENT_LOG; i++) {
4782                 struct curseg_info *curseg = CURSEG_I(sbi, i);
4783                 struct seg_entry *se = get_seg_entry(sbi, curseg->segno);
4784                 unsigned int blkofs = curseg->next_blkoff;
4785
4786                 if (f2fs_sb_has_readonly(sbi) &&
4787                         i != CURSEG_HOT_DATA && i != CURSEG_HOT_NODE)
4788                         continue;
4789
4790                 sanity_check_seg_type(sbi, curseg->seg_type);
4791
4792                 if (f2fs_test_bit(blkofs, se->cur_valid_map))
4793                         goto out;
4794
4795                 if (curseg->alloc_type == SSR)
4796                         continue;
4797
4798                 for (blkofs += 1; blkofs < sbi->blocks_per_seg; blkofs++) {
4799                         if (!f2fs_test_bit(blkofs, se->cur_valid_map))
4800                                 continue;
4801 out:
4802                         f2fs_err(sbi,
4803                                  "Current segment's next free block offset is inconsistent with bitmap, logtype:%u, segno:%u, type:%u, next_blkoff:%u, blkofs:%u",
4804                                  i, curseg->segno, curseg->alloc_type,
4805                                  curseg->next_blkoff, blkofs);
4806                         return -EFSCORRUPTED;
4807                 }
4808         }
4809         return 0;
4810 }
4811
4812 #ifdef CONFIG_BLK_DEV_ZONED
4813
4814 static int check_zone_write_pointer(struct f2fs_sb_info *sbi,
4815                                     struct f2fs_dev_info *fdev,
4816                                     struct blk_zone *zone)
4817 {
4818         unsigned int wp_segno, wp_blkoff, zone_secno, zone_segno, segno;
4819         block_t zone_block, wp_block, last_valid_block;
4820         unsigned int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
4821         int i, s, b, ret;
4822         struct seg_entry *se;
4823
4824         if (zone->type != BLK_ZONE_TYPE_SEQWRITE_REQ)
4825                 return 0;
4826
4827         wp_block = fdev->start_blk + (zone->wp >> log_sectors_per_block);
4828         wp_segno = GET_SEGNO(sbi, wp_block);
4829         wp_blkoff = wp_block - START_BLOCK(sbi, wp_segno);
4830         zone_block = fdev->start_blk + (zone->start >> log_sectors_per_block);
4831         zone_segno = GET_SEGNO(sbi, zone_block);
4832         zone_secno = GET_SEC_FROM_SEG(sbi, zone_segno);
4833
4834         if (zone_segno >= MAIN_SEGS(sbi))
4835                 return 0;
4836
4837         /*
4838          * Skip check of zones cursegs point to, since
4839          * fix_curseg_write_pointer() checks them.
4840          */
4841         for (i = 0; i < NO_CHECK_TYPE; i++)
4842                 if (zone_secno == GET_SEC_FROM_SEG(sbi,
4843                                                    CURSEG_I(sbi, i)->segno))
4844                         return 0;
4845
4846         /*
4847          * Get last valid block of the zone.
4848          */
4849         last_valid_block = zone_block - 1;
4850         for (s = sbi->segs_per_sec - 1; s >= 0; s--) {
4851                 segno = zone_segno + s;
4852                 se = get_seg_entry(sbi, segno);
4853                 for (b = sbi->blocks_per_seg - 1; b >= 0; b--)
4854                         if (f2fs_test_bit(b, se->cur_valid_map)) {
4855                                 last_valid_block = START_BLOCK(sbi, segno) + b;
4856                                 break;
4857                         }
4858                 if (last_valid_block >= zone_block)
4859                         break;
4860         }
4861
4862         /*
4863          * If last valid block is beyond the write pointer, report the
4864          * inconsistency. This inconsistency does not cause write error
4865          * because the zone will not be selected for write operation until
4866          * it get discarded. Just report it.
4867          */
4868         if (last_valid_block >= wp_block) {
4869                 f2fs_notice(sbi, "Valid block beyond write pointer: "
4870                             "valid block[0x%x,0x%x] wp[0x%x,0x%x]",
4871                             GET_SEGNO(sbi, last_valid_block),
4872                             GET_BLKOFF_FROM_SEG0(sbi, last_valid_block),
4873                             wp_segno, wp_blkoff);
4874                 return 0;
4875         }
4876
4877         /*
4878          * If there is no valid block in the zone and if write pointer is
4879          * not at zone start, reset the write pointer.
4880          */
4881         if (last_valid_block + 1 == zone_block && zone->wp != zone->start) {
4882                 f2fs_notice(sbi,
4883                             "Zone without valid block has non-zero write "
4884                             "pointer. Reset the write pointer: wp[0x%x,0x%x]",
4885                             wp_segno, wp_blkoff);
4886                 ret = __f2fs_issue_discard_zone(sbi, fdev->bdev, zone_block,
4887                                         zone->len >> log_sectors_per_block);
4888                 if (ret) {
4889                         f2fs_err(sbi, "Discard zone failed: %s (errno=%d)",
4890                                  fdev->path, ret);
4891                         return ret;
4892                 }
4893         }
4894
4895         return 0;
4896 }
4897
4898 static struct f2fs_dev_info *get_target_zoned_dev(struct f2fs_sb_info *sbi,
4899                                                   block_t zone_blkaddr)
4900 {
4901         int i;
4902
4903         for (i = 0; i < sbi->s_ndevs; i++) {
4904                 if (!bdev_is_zoned(FDEV(i).bdev))
4905                         continue;
4906                 if (sbi->s_ndevs == 1 || (FDEV(i).start_blk <= zone_blkaddr &&
4907                                 zone_blkaddr <= FDEV(i).end_blk))
4908                         return &FDEV(i);
4909         }
4910
4911         return NULL;
4912 }
4913
4914 static int report_one_zone_cb(struct blk_zone *zone, unsigned int idx,
4915                               void *data)
4916 {
4917         memcpy(data, zone, sizeof(struct blk_zone));
4918         return 0;
4919 }
4920
4921 static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
4922 {
4923         struct curseg_info *cs = CURSEG_I(sbi, type);
4924         struct f2fs_dev_info *zbd;
4925         struct blk_zone zone;
4926         unsigned int cs_section, wp_segno, wp_blkoff, wp_sector_off;
4927         block_t cs_zone_block, wp_block;
4928         unsigned int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
4929         sector_t zone_sector;
4930         int err;
4931
4932         cs_section = GET_SEC_FROM_SEG(sbi, cs->segno);
4933         cs_zone_block = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, cs_section));
4934
4935         zbd = get_target_zoned_dev(sbi, cs_zone_block);
4936         if (!zbd)
4937                 return 0;
4938
4939         /* report zone for the sector the curseg points to */
4940         zone_sector = (sector_t)(cs_zone_block - zbd->start_blk)
4941                 << log_sectors_per_block;
4942         err = blkdev_report_zones(zbd->bdev, zone_sector, 1,
4943                                   report_one_zone_cb, &zone);
4944         if (err != 1) {
4945                 f2fs_err(sbi, "Report zone failed: %s errno=(%d)",
4946                          zbd->path, err);
4947                 return err;
4948         }
4949
4950         if (zone.type != BLK_ZONE_TYPE_SEQWRITE_REQ)
4951                 return 0;
4952
4953         wp_block = zbd->start_blk + (zone.wp >> log_sectors_per_block);
4954         wp_segno = GET_SEGNO(sbi, wp_block);
4955         wp_blkoff = wp_block - START_BLOCK(sbi, wp_segno);
4956         wp_sector_off = zone.wp & GENMASK(log_sectors_per_block - 1, 0);
4957
4958         if (cs->segno == wp_segno && cs->next_blkoff == wp_blkoff &&
4959                 wp_sector_off == 0)
4960                 return 0;
4961
4962         f2fs_notice(sbi, "Unaligned curseg[%d] with write pointer: "
4963                     "curseg[0x%x,0x%x] wp[0x%x,0x%x]",
4964                     type, cs->segno, cs->next_blkoff, wp_segno, wp_blkoff);
4965
4966         f2fs_notice(sbi, "Assign new section to curseg[%d]: "
4967                     "curseg[0x%x,0x%x]", type, cs->segno, cs->next_blkoff);
4968
4969         f2fs_allocate_new_section(sbi, type, true);
4970
4971         /* check consistency of the zone curseg pointed to */
4972         if (check_zone_write_pointer(sbi, zbd, &zone))
4973                 return -EIO;
4974
4975         /* check newly assigned zone */
4976         cs_section = GET_SEC_FROM_SEG(sbi, cs->segno);
4977         cs_zone_block = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, cs_section));
4978
4979         zbd = get_target_zoned_dev(sbi, cs_zone_block);
4980         if (!zbd)
4981                 return 0;
4982
4983         zone_sector = (sector_t)(cs_zone_block - zbd->start_blk)
4984                 << log_sectors_per_block;
4985         err = blkdev_report_zones(zbd->bdev, zone_sector, 1,
4986                                   report_one_zone_cb, &zone);
4987         if (err != 1) {
4988                 f2fs_err(sbi, "Report zone failed: %s errno=(%d)",
4989                          zbd->path, err);
4990                 return err;
4991         }
4992
4993         if (zone.type != BLK_ZONE_TYPE_SEQWRITE_REQ)
4994                 return 0;
4995
4996         if (zone.wp != zone.start) {
4997                 f2fs_notice(sbi,
4998                             "New zone for curseg[%d] is not yet discarded. "
4999                             "Reset the zone: curseg[0x%x,0x%x]",
5000                             type, cs->segno, cs->next_blkoff);
5001                 err = __f2fs_issue_discard_zone(sbi, zbd->bdev,
5002                                 zone_sector >> log_sectors_per_block,
5003                                 zone.len >> log_sectors_per_block);
5004                 if (err) {
5005                         f2fs_err(sbi, "Discard zone failed: %s (errno=%d)",
5006                                  zbd->path, err);
5007                         return err;
5008                 }
5009         }
5010
5011         return 0;
5012 }
5013
5014 int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)
5015 {
5016         int i, ret;
5017
5018         for (i = 0; i < NR_PERSISTENT_LOG; i++) {
5019                 ret = fix_curseg_write_pointer(sbi, i);
5020                 if (ret)
5021                         return ret;
5022         }
5023
5024         return 0;
5025 }
5026
5027 struct check_zone_write_pointer_args {
5028         struct f2fs_sb_info *sbi;
5029         struct f2fs_dev_info *fdev;
5030 };
5031
5032 static int check_zone_write_pointer_cb(struct blk_zone *zone, unsigned int idx,
5033                                       void *data)
5034 {
5035         struct check_zone_write_pointer_args *args;
5036
5037         args = (struct check_zone_write_pointer_args *)data;
5038
5039         return check_zone_write_pointer(args->sbi, args->fdev, zone);
5040 }
5041
5042 int f2fs_check_write_pointer(struct f2fs_sb_info *sbi)
5043 {
5044         int i, ret;
5045         struct check_zone_write_pointer_args args;
5046
5047         for (i = 0; i < sbi->s_ndevs; i++) {
5048                 if (!bdev_is_zoned(FDEV(i).bdev))
5049                         continue;
5050
5051                 args.sbi = sbi;
5052                 args.fdev = &FDEV(i);
5053                 ret = blkdev_report_zones(FDEV(i).bdev, 0, BLK_ALL_ZONES,
5054                                           check_zone_write_pointer_cb, &args);
5055                 if (ret < 0)
5056                         return ret;
5057         }
5058
5059         return 0;
5060 }
5061
5062 static bool is_conv_zone(struct f2fs_sb_info *sbi, unsigned int zone_idx,
5063                                                 unsigned int dev_idx)
5064 {
5065         if (!bdev_is_zoned(FDEV(dev_idx).bdev))
5066                 return true;
5067         return !test_bit(zone_idx, FDEV(dev_idx).blkz_seq);
5068 }
5069
5070 /* Return the zone index in the given device */
5071 static unsigned int get_zone_idx(struct f2fs_sb_info *sbi, unsigned int secno,
5072                                         int dev_idx)
5073 {
5074         block_t sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
5075
5076         return (sec_start_blkaddr - FDEV(dev_idx).start_blk) >>
5077                                                 sbi->log_blocks_per_blkz;
5078 }
5079
5080 /*
5081  * Return the usable segments in a section based on the zone's
5082  * corresponding zone capacity. Zone is equal to a section.
5083  */
5084 static inline unsigned int f2fs_usable_zone_segs_in_sec(
5085                 struct f2fs_sb_info *sbi, unsigned int segno)
5086 {
5087         unsigned int dev_idx, zone_idx, unusable_segs_in_sec;
5088
5089         dev_idx = f2fs_target_device_index(sbi, START_BLOCK(sbi, segno));
5090         zone_idx = get_zone_idx(sbi, GET_SEC_FROM_SEG(sbi, segno), dev_idx);
5091
5092         /* Conventional zone's capacity is always equal to zone size */
5093         if (is_conv_zone(sbi, zone_idx, dev_idx))
5094                 return sbi->segs_per_sec;
5095
5096         /*
5097          * If the zone_capacity_blocks array is NULL, then zone capacity
5098          * is equal to the zone size for all zones
5099          */
5100         if (!FDEV(dev_idx).zone_capacity_blocks)
5101                 return sbi->segs_per_sec;
5102
5103         /* Get the segment count beyond zone capacity block */
5104         unusable_segs_in_sec = (sbi->blocks_per_blkz -
5105                                 FDEV(dev_idx).zone_capacity_blocks[zone_idx]) >>
5106                                 sbi->log_blocks_per_seg;
5107         return sbi->segs_per_sec - unusable_segs_in_sec;
5108 }
5109
5110 /*
5111  * Return the number of usable blocks in a segment. The number of blocks
5112  * returned is always equal to the number of blocks in a segment for
5113  * segments fully contained within a sequential zone capacity or a
5114  * conventional zone. For segments partially contained in a sequential
5115  * zone capacity, the number of usable blocks up to the zone capacity
5116  * is returned. 0 is returned in all other cases.
5117  */
5118 static inline unsigned int f2fs_usable_zone_blks_in_seg(
5119                         struct f2fs_sb_info *sbi, unsigned int segno)
5120 {
5121         block_t seg_start, sec_start_blkaddr, sec_cap_blkaddr;
5122         unsigned int zone_idx, dev_idx, secno;
5123
5124         secno = GET_SEC_FROM_SEG(sbi, segno);
5125         seg_start = START_BLOCK(sbi, segno);
5126         dev_idx = f2fs_target_device_index(sbi, seg_start);
5127         zone_idx = get_zone_idx(sbi, secno, dev_idx);
5128
5129         /*
5130          * Conventional zone's capacity is always equal to zone size,
5131          * so, blocks per segment is unchanged.
5132          */
5133         if (is_conv_zone(sbi, zone_idx, dev_idx))
5134                 return sbi->blocks_per_seg;
5135
5136         if (!FDEV(dev_idx).zone_capacity_blocks)
5137                 return sbi->blocks_per_seg;
5138
5139         sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
5140         sec_cap_blkaddr = sec_start_blkaddr +
5141                                 FDEV(dev_idx).zone_capacity_blocks[zone_idx];
5142
5143         /*
5144          * If segment starts before zone capacity and spans beyond
5145          * zone capacity, then usable blocks are from seg start to
5146          * zone capacity. If the segment starts after the zone capacity,
5147          * then there are no usable blocks.
5148          */
5149         if (seg_start >= sec_cap_blkaddr)
5150                 return 0;
5151         if (seg_start + sbi->blocks_per_seg > sec_cap_blkaddr)
5152                 return sec_cap_blkaddr - seg_start;
5153
5154         return sbi->blocks_per_seg;
5155 }
5156 #else
5157 int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)
5158 {
5159         return 0;
5160 }
5161
5162 int f2fs_check_write_pointer(struct f2fs_sb_info *sbi)
5163 {
5164         return 0;
5165 }
5166
5167 static inline unsigned int f2fs_usable_zone_blks_in_seg(struct f2fs_sb_info *sbi,
5168                                                         unsigned int segno)
5169 {
5170         return 0;
5171 }
5172
5173 static inline unsigned int f2fs_usable_zone_segs_in_sec(struct f2fs_sb_info *sbi,
5174                                                         unsigned int segno)
5175 {
5176         return 0;
5177 }
5178 #endif
5179 unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
5180                                         unsigned int segno)
5181 {
5182         if (f2fs_sb_has_blkzoned(sbi))
5183                 return f2fs_usable_zone_blks_in_seg(sbi, segno);
5184
5185         return sbi->blocks_per_seg;
5186 }
5187
5188 unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
5189                                         unsigned int segno)
5190 {
5191         if (f2fs_sb_has_blkzoned(sbi))
5192                 return f2fs_usable_zone_segs_in_sec(sbi, segno);
5193
5194         return sbi->segs_per_sec;
5195 }
5196
5197 /*
5198  * Update min, max modified time for cost-benefit GC algorithm
5199  */
5200 static void init_min_max_mtime(struct f2fs_sb_info *sbi)
5201 {
5202         struct sit_info *sit_i = SIT_I(sbi);
5203         unsigned int segno;
5204
5205         down_write(&sit_i->sentry_lock);
5206
5207         sit_i->min_mtime = ULLONG_MAX;
5208
5209         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
5210                 unsigned int i;
5211                 unsigned long long mtime = 0;
5212
5213                 for (i = 0; i < sbi->segs_per_sec; i++)
5214                         mtime += get_seg_entry(sbi, segno + i)->mtime;
5215
5216                 mtime = div_u64(mtime, sbi->segs_per_sec);
5217
5218                 if (sit_i->min_mtime > mtime)
5219                         sit_i->min_mtime = mtime;
5220         }
5221         sit_i->max_mtime = get_mtime(sbi, false);
5222         sit_i->dirty_max_mtime = 0;
5223         up_write(&sit_i->sentry_lock);
5224 }
5225
5226 int f2fs_build_segment_manager(struct f2fs_sb_info *sbi)
5227 {
5228         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
5229         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
5230         struct f2fs_sm_info *sm_info;
5231         int err;
5232
5233         sm_info = f2fs_kzalloc(sbi, sizeof(struct f2fs_sm_info), GFP_KERNEL);
5234         if (!sm_info)
5235                 return -ENOMEM;
5236
5237         /* init sm info */
5238         sbi->sm_info = sm_info;
5239         sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
5240         sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
5241         sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
5242         sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
5243         sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
5244         sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
5245         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
5246         sm_info->rec_prefree_segments = sm_info->main_segments *
5247                                         DEF_RECLAIM_PREFREE_SEGMENTS / 100;
5248         if (sm_info->rec_prefree_segments > DEF_MAX_RECLAIM_PREFREE_SEGMENTS)
5249                 sm_info->rec_prefree_segments = DEF_MAX_RECLAIM_PREFREE_SEGMENTS;
5250
5251         if (!f2fs_lfs_mode(sbi))
5252                 sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
5253         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
5254         sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
5255         sm_info->min_seq_blocks = sbi->blocks_per_seg;
5256         sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS;
5257         sm_info->min_ssr_sections = reserved_sections(sbi);
5258
5259         INIT_LIST_HEAD(&sm_info->sit_entry_set);
5260
5261         init_rwsem(&sm_info->curseg_lock);
5262
5263         if (!f2fs_readonly(sbi->sb)) {
5264                 err = f2fs_create_flush_cmd_control(sbi);
5265                 if (err)
5266                         return err;
5267         }
5268
5269         err = create_discard_cmd_control(sbi);
5270         if (err)
5271                 return err;
5272
5273         err = build_sit_info(sbi);
5274         if (err)
5275                 return err;
5276         err = build_free_segmap(sbi);
5277         if (err)
5278                 return err;
5279         err = build_curseg(sbi);
5280         if (err)
5281                 return err;
5282
5283         /* reinit free segmap based on SIT */
5284         err = build_sit_entries(sbi);
5285         if (err)
5286                 return err;
5287
5288         init_free_segmap(sbi);
5289         err = build_dirty_segmap(sbi);
5290         if (err)
5291                 return err;
5292
5293         err = sanity_check_curseg(sbi);
5294         if (err)
5295                 return err;
5296
5297         init_min_max_mtime(sbi);
5298         return 0;
5299 }
5300
5301 static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
5302                 enum dirty_type dirty_type)
5303 {
5304         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
5305
5306         mutex_lock(&dirty_i->seglist_lock);
5307         kvfree(dirty_i->dirty_segmap[dirty_type]);
5308         dirty_i->nr_dirty[dirty_type] = 0;
5309         mutex_unlock(&dirty_i->seglist_lock);
5310 }
5311
5312 static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
5313 {
5314         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
5315
5316         kvfree(dirty_i->victim_secmap);
5317 }
5318
5319 static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
5320 {
5321         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
5322         int i;
5323
5324         if (!dirty_i)
5325                 return;
5326
5327         /* discard pre-free/dirty segments list */
5328         for (i = 0; i < NR_DIRTY_TYPE; i++)
5329                 discard_dirty_segmap(sbi, i);
5330
5331         if (__is_large_section(sbi)) {
5332                 mutex_lock(&dirty_i->seglist_lock);
5333                 kvfree(dirty_i->dirty_secmap);
5334                 mutex_unlock(&dirty_i->seglist_lock);
5335         }
5336
5337         destroy_victim_secmap(sbi);
5338         SM_I(sbi)->dirty_info = NULL;
5339         kfree(dirty_i);
5340 }
5341
5342 static void destroy_curseg(struct f2fs_sb_info *sbi)
5343 {
5344         struct curseg_info *array = SM_I(sbi)->curseg_array;
5345         int i;
5346
5347         if (!array)
5348                 return;
5349         SM_I(sbi)->curseg_array = NULL;
5350         for (i = 0; i < NR_CURSEG_TYPE; i++) {
5351                 kfree(array[i].sum_blk);
5352                 kfree(array[i].journal);
5353         }
5354         kfree(array);
5355 }
5356
5357 static void destroy_free_segmap(struct f2fs_sb_info *sbi)
5358 {
5359         struct free_segmap_info *free_i = SM_I(sbi)->free_info;
5360
5361         if (!free_i)
5362                 return;
5363         SM_I(sbi)->free_info = NULL;
5364         kvfree(free_i->free_segmap);
5365         kvfree(free_i->free_secmap);
5366         kfree(free_i);
5367 }
5368
5369 static void destroy_sit_info(struct f2fs_sb_info *sbi)
5370 {
5371         struct sit_info *sit_i = SIT_I(sbi);
5372
5373         if (!sit_i)
5374                 return;
5375
5376         if (sit_i->sentries)
5377                 kvfree(sit_i->bitmap);
5378         kfree(sit_i->tmp_map);
5379
5380         kvfree(sit_i->sentries);
5381         kvfree(sit_i->sec_entries);
5382         kvfree(sit_i->dirty_sentries_bitmap);
5383
5384         SM_I(sbi)->sit_info = NULL;
5385         kvfree(sit_i->sit_bitmap);
5386 #ifdef CONFIG_F2FS_CHECK_FS
5387         kvfree(sit_i->sit_bitmap_mir);
5388         kvfree(sit_i->invalid_segmap);
5389 #endif
5390         kfree(sit_i);
5391 }
5392
5393 void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi)
5394 {
5395         struct f2fs_sm_info *sm_info = SM_I(sbi);
5396
5397         if (!sm_info)
5398                 return;
5399         f2fs_destroy_flush_cmd_control(sbi, true);
5400         destroy_discard_cmd_control(sbi);
5401         destroy_dirty_segmap(sbi);
5402         destroy_curseg(sbi);
5403         destroy_free_segmap(sbi);
5404         destroy_sit_info(sbi);
5405         sbi->sm_info = NULL;
5406         kfree(sm_info);
5407 }
5408
5409 int __init f2fs_create_segment_manager_caches(void)
5410 {
5411         discard_entry_slab = f2fs_kmem_cache_create("f2fs_discard_entry",
5412                         sizeof(struct discard_entry));
5413         if (!discard_entry_slab)
5414                 goto fail;
5415
5416         discard_cmd_slab = f2fs_kmem_cache_create("f2fs_discard_cmd",
5417                         sizeof(struct discard_cmd));
5418         if (!discard_cmd_slab)
5419                 goto destroy_discard_entry;
5420
5421         sit_entry_set_slab = f2fs_kmem_cache_create("f2fs_sit_entry_set",
5422                         sizeof(struct sit_entry_set));
5423         if (!sit_entry_set_slab)
5424                 goto destroy_discard_cmd;
5425
5426         inmem_entry_slab = f2fs_kmem_cache_create("f2fs_inmem_page_entry",
5427                         sizeof(struct inmem_pages));
5428         if (!inmem_entry_slab)
5429                 goto destroy_sit_entry_set;
5430         return 0;
5431
5432 destroy_sit_entry_set:
5433         kmem_cache_destroy(sit_entry_set_slab);
5434 destroy_discard_cmd:
5435         kmem_cache_destroy(discard_cmd_slab);
5436 destroy_discard_entry:
5437         kmem_cache_destroy(discard_entry_slab);
5438 fail:
5439         return -ENOMEM;
5440 }
5441
5442 void f2fs_destroy_segment_manager_caches(void)
5443 {
5444         kmem_cache_destroy(sit_entry_set_slab);
5445         kmem_cache_destroy(discard_cmd_slab);
5446         kmem_cache_destroy(discard_entry_slab);
5447         kmem_cache_destroy(inmem_entry_slab);
5448 }