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