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