fs/f2fs/recovery.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/recovery.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 "f2fs.h"
  11 #include "node.h"
  12 #include "segment.h"
  13
  14 /*
  15  * Roll forward recovery scenarios.
  16  *
  17  * [Term] F: fsync_mark, D: dentry_mark
  18  *
  19  * 1. inode(x) | CP | inode(x) | dnode(F)
  20  * -> Update the latest inode(x).
  21  *
  22  * 2. inode(x) | CP | inode(F) | dnode(F)
  23  * -> No problem.
  24  *
  25  * 3. inode(x) | CP | dnode(F) | inode(x)
  26  * -> Recover to the latest dnode(F), and drop the last inode(x)
  27  *
  28  * 4. inode(x) | CP | dnode(F) | inode(F)
  29  * -> No problem.
  30  *
  31  * 5. CP | inode(x) | dnode(F)
  32  * -> The inode(DF) was missing. Should drop this dnode(F).
  33  *
  34  * 6. CP | inode(DF) | dnode(F)
  35  * -> No problem.
  36  *
  37  * 7. CP | dnode(F) | inode(DF)
  38  * -> If f2fs_iget fails, then goto next to find inode(DF).
  39  *
  40  * 8. CP | dnode(F) | inode(x)
  41  * -> If f2fs_iget fails, then goto next to find inode(DF).
  42  *    But it will fail due to no inode(DF).
  43  */
  44
  45 static struct kmem_cache *fsync_entry_slab;
  46
  47 bool f2fs_space_for_roll_forward(struct f2fs_sb_info *sbi)
  48 {
  49         s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
  50
  51         if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
  52                 return false;
  53         return true;
  54 }
  55
  56 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
  57                                                                 nid_t ino)
  58 {
  59         struct fsync_inode_entry *entry;
  60
  61         list_for_each_entry(entry, head, list)
  62                 if (entry->inode->i_ino == ino)
  63                         return entry;
  64
  65         return NULL;
  66 }
  67
  68 static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
  69                         struct list_head *head, nid_t ino, bool quota_inode)
  70 {
  71         struct inode *inode;
  72         struct fsync_inode_entry *entry;
  73         int err;
  74
  75         inode = f2fs_iget_retry(sbi->sb, ino);
  76         if (IS_ERR(inode))
  77                 return ERR_CAST(inode);
  78
  79         err = dquot_initialize(inode);
  80         if (err)
  81                 goto err_out;
  82
  83         if (quota_inode) {
  84                 err = dquot_alloc_inode(inode);
  85                 if (err)
  86                         goto err_out;
  87         }
  88
  89         entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
  90         entry->inode = inode;
  91         list_add_tail(&entry->list, head);
  92
  93         return entry;
  94 err_out:
  95         iput(inode);
  96         return ERR_PTR(err);
  97 }
  98
  99 static void del_fsync_inode(struct fsync_inode_entry *entry, int drop)
 100 {
 101         if (drop) {
 102                 /* inode should not be recovered, drop it */
 103                 f2fs_inode_synced(entry->inode);
 104         }
 105         iput(entry->inode);
 106         list_del(&entry->list);
 107         kmem_cache_free(fsync_entry_slab, entry);
 108 }
 109
 110 static int recover_dentry(struct inode *inode, struct page *ipage,
 111                                                 struct list_head *dir_list)
 112 {
 113         struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
 114         nid_t pino = le32_to_cpu(raw_inode->i_pino);
 115         struct f2fs_dir_entry *de;
 116         struct fscrypt_name fname;
 117         struct page *page;
 118         struct inode *dir, *einode;
 119         struct fsync_inode_entry *entry;
 120         int err = 0;
 121         char *name;
 122
 123         entry = get_fsync_inode(dir_list, pino);
 124         if (!entry) {
 125                 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
 126                                                         pino, false);
 127                 if (IS_ERR(entry)) {
 128                         dir = ERR_CAST(entry);
 129                         err = PTR_ERR(entry);
 130                         goto out;
 131                 }
 132         }
 133
 134         dir = entry->inode;
 135
 136         memset(&fname, 0, sizeof(struct fscrypt_name));
 137         fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
 138         fname.disk_name.name = raw_inode->i_name;
 139
 140         if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
 141                 WARN_ON(1);
 142                 err = -ENAMETOOLONG;
 143                 goto out;
 144         }
 145 retry:
 146         de = __f2fs_find_entry(dir, &fname, &page);
 147         if (de && inode->i_ino == le32_to_cpu(de->ino))
 148                 goto out_put;
 149
 150         if (de) {
 151                 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
 152                 if (IS_ERR(einode)) {
 153                         WARN_ON(1);
 154                         err = PTR_ERR(einode);
 155                         if (err == -ENOENT)
 156                                 err = -EEXIST;
 157                         goto out_put;
 158                 }
 159
 160                 err = dquot_initialize(einode);
 161                 if (err) {
 162                         iput(einode);
 163                         goto out_put;
 164                 }
 165
 166                 err = f2fs_acquire_orphan_inode(F2FS_I_SB(inode));
 167                 if (err) {
 168                         iput(einode);
 169                         goto out_put;
 170                 }
 171                 f2fs_delete_entry(de, page, dir, einode);
 172                 iput(einode);
 173                 goto retry;
 174         } else if (IS_ERR(page)) {
 175                 err = PTR_ERR(page);
 176         } else {
 177                 err = f2fs_add_dentry(dir, &fname, inode,
 178                                         inode->i_ino, inode->i_mode);
 179         }
 180         if (err == -ENOMEM)
 181                 goto retry;
 182         goto out;
 183
 184 out_put:
 185         f2fs_put_page(page, 0);
 186 out:
 187         if (file_enc_name(inode))
 188                 name = "<encrypted>";
 189         else
 190                 name = raw_inode->i_name;
 191         f2fs_msg(inode->i_sb, KERN_NOTICE,
 192                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 193                         __func__, ino_of_node(ipage), name,
 194                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 195         return err;
 196 }
 197
 198 static int recover_quota_data(struct inode *inode, struct page *page)
 199 {
 200         struct f2fs_inode *raw = F2FS_INODE(page);
 201         struct iattr attr;
 202         uid_t i_uid = le32_to_cpu(raw->i_uid);
 203         gid_t i_gid = le32_to_cpu(raw->i_gid);
 204         int err;
 205
 206         memset(&attr, 0, sizeof(attr));
 207
 208         attr.ia_uid = make_kuid(inode->i_sb->s_user_ns, i_uid);
 209         attr.ia_gid = make_kgid(inode->i_sb->s_user_ns, i_gid);
 210
 211         if (!uid_eq(attr.ia_uid, inode->i_uid))
 212                 attr.ia_valid |= ATTR_UID;
 213         if (!gid_eq(attr.ia_gid, inode->i_gid))
 214                 attr.ia_valid |= ATTR_GID;
 215
 216         if (!attr.ia_valid)
 217                 return 0;
 218
 219         err = dquot_transfer(inode, &attr);
 220         if (err)
 221                 set_sbi_flag(F2FS_I_SB(inode), SBI_QUOTA_NEED_REPAIR);
 222         return err;
 223 }
 224
 225 static void recover_inline_flags(struct inode *inode, struct f2fs_inode *ri)
 226 {
 227         if (ri->i_inline & F2FS_PIN_FILE)
 228                 set_inode_flag(inode, FI_PIN_FILE);
 229         else
 230                 clear_inode_flag(inode, FI_PIN_FILE);
 231         if (ri->i_inline & F2FS_DATA_EXIST)
 232                 set_inode_flag(inode, FI_DATA_EXIST);
 233         else
 234                 clear_inode_flag(inode, FI_DATA_EXIST);
 235 }
 236
 237 static int recover_inode(struct inode *inode, struct page *page)
 238 {
 239         struct f2fs_inode *raw = F2FS_INODE(page);
 240         char *name;
 241         int err;
 242
 243         inode->i_mode = le16_to_cpu(raw->i_mode);
 244
 245         err = recover_quota_data(inode, page);
 246         if (err)
 247                 return err;
 248
 249         i_uid_write(inode, le32_to_cpu(raw->i_uid));
 250         i_gid_write(inode, le32_to_cpu(raw->i_gid));
 251
 252         if (raw->i_inline & F2FS_EXTRA_ATTR) {
 253                 if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)) &&
 254                         F2FS_FITS_IN_INODE(raw, le16_to_cpu(raw->i_extra_isize),
 255                                                                 i_projid)) {
 256                         projid_t i_projid;
 257                         kprojid_t kprojid;
 258
 259                         i_projid = (projid_t)le32_to_cpu(raw->i_projid);
 260                         kprojid = make_kprojid(&init_user_ns, i_projid);
 261
 262                         if (!projid_eq(kprojid, F2FS_I(inode)->i_projid)) {
 263                                 err = f2fs_transfer_project_quota(inode,
 264                                                                 kprojid);
 265                                 if (err)
 266                                         return err;
 267                                 F2FS_I(inode)->i_projid = kprojid;
 268                         }
 269                 }
 270         }
 271
 272         f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
 273         inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
 274         inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
 275         inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
 276         inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
 277         inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
 278         inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 279
 280         F2FS_I(inode)->i_advise = raw->i_advise;
 281         F2FS_I(inode)->i_flags = le32_to_cpu(raw->i_flags);
 282         f2fs_set_inode_flags(inode);
 283         F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN] =
 284                                 le16_to_cpu(raw->i_gc_failures);
 285
 286         recover_inline_flags(inode, raw);
 287
 288         f2fs_mark_inode_dirty_sync(inode, true);
 289
 290         if (file_enc_name(inode))
 291                 name = "<encrypted>";
 292         else
 293                 name = F2FS_INODE(page)->i_name;
 294
 295         f2fs_msg(inode->i_sb, KERN_NOTICE,
 296                 "recover_inode: ino = %x, name = %s, inline = %x",
 297                         ino_of_node(page), name, raw->i_inline);
 298         return 0;
 299 }
 300
 301 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
 302                                 bool check_only)
 303 {
 304         struct curseg_info *curseg;
 305         struct page *page = NULL;
 306         block_t blkaddr;
 307         unsigned int loop_cnt = 0;
 308         unsigned int free_blocks = MAIN_SEGS(sbi) * sbi->blocks_per_seg -
 309                                                 valid_user_blocks(sbi);
 310         int err = 0;
 311
 312         /* get node pages in the current segment */
 313         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 314         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 315
 316         while (1) {
 317                 struct fsync_inode_entry *entry;
 318
 319                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
 320                         return 0;
 321
 322                 page = f2fs_get_tmp_page(sbi, blkaddr);
 323                 if (IS_ERR(page)) {
 324                         err = PTR_ERR(page);
 325                         break;
 326                 }
 327
 328                 if (!is_recoverable_dnode(page)) {
 329                         f2fs_put_page(page, 1);
 330                         break;
 331                 }
 332
 333                 if (!is_fsync_dnode(page))
 334                         goto next;
 335
 336                 entry = get_fsync_inode(head, ino_of_node(page));
 337                 if (!entry) {
 338                         bool quota_inode = false;
 339
 340                         if (!check_only &&
 341                                         IS_INODE(page) && is_dent_dnode(page)) {
 342                                 err = f2fs_recover_inode_page(sbi, page);
 343                                 if (err) {
 344                                         f2fs_put_page(page, 1);
 345                                         break;
 346                                 }
 347                                 quota_inode = true;
 348                         }
 349
 350                         /*
 351                          * CP | dnode(F) | inode(DF)
 352                          * For this case, we should not give up now.
 353                          */
 354                         entry = add_fsync_inode(sbi, head, ino_of_node(page),
 355                                                                 quota_inode);
 356                         if (IS_ERR(entry)) {
 357                                 err = PTR_ERR(entry);
 358                                 if (err == -ENOENT) {
 359                                         err = 0;
 360                                         goto next;
 361                                 }
 362                                 f2fs_put_page(page, 1);
 363                                 break;
 364                         }
 365                 }
 366                 entry->blkaddr = blkaddr;
 367
 368                 if (IS_INODE(page) && is_dent_dnode(page))
 369                         entry->last_dentry = blkaddr;
 370 next:
 371                 /* sanity check in order to detect looped node chain */
 372                 if (++loop_cnt >= free_blocks ||
 373                         blkaddr == next_blkaddr_of_node(page)) {
 374                         f2fs_msg(sbi->sb, KERN_NOTICE,
 375                                 "%s: detect looped node chain, "
 376                                 "blkaddr:%u, next:%u",
 377                                 __func__, blkaddr, next_blkaddr_of_node(page));
 378                         f2fs_put_page(page, 1);
 379                         err = -EINVAL;
 380                         break;
 381                 }
 382
 383                 /* check next segment */
 384                 blkaddr = next_blkaddr_of_node(page);
 385                 f2fs_put_page(page, 1);
 386
 387                 f2fs_ra_meta_pages_cond(sbi, blkaddr);
 388         }
 389         return err;
 390 }
 391
 392 static void destroy_fsync_dnodes(struct list_head *head, int drop)
 393 {
 394         struct fsync_inode_entry *entry, *tmp;
 395
 396         list_for_each_entry_safe(entry, tmp, head, list)
 397                 del_fsync_inode(entry, drop);
 398 }
 399
 400 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 401                         block_t blkaddr, struct dnode_of_data *dn)
 402 {
 403         struct seg_entry *sentry;
 404         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 405         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 406         struct f2fs_summary_block *sum_node;
 407         struct f2fs_summary sum;
 408         struct page *sum_page, *node_page;
 409         struct dnode_of_data tdn = *dn;
 410         nid_t ino, nid;
 411         struct inode *inode;
 412         unsigned int offset;
 413         block_t bidx;
 414         int i;
 415
 416         sentry = get_seg_entry(sbi, segno);
 417         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 418                 return 0;
 419
 420         /* Get the previous summary */
 421         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 422                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 423                 if (curseg->segno == segno) {
 424                         sum = curseg->sum_blk->entries[blkoff];
 425                         goto got_it;
 426                 }
 427         }
 428
 429         sum_page = f2fs_get_sum_page(sbi, segno);
 430         if (IS_ERR(sum_page))
 431                 return PTR_ERR(sum_page);
 432         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 433         sum = sum_node->entries[blkoff];
 434         f2fs_put_page(sum_page, 1);
 435 got_it:
 436         /* Use the locked dnode page and inode */
 437         nid = le32_to_cpu(sum.nid);
 438         if (dn->inode->i_ino == nid) {
 439                 tdn.nid = nid;
 440                 if (!dn->inode_page_locked)
 441                         lock_page(dn->inode_page);
 442                 tdn.node_page = dn->inode_page;
 443                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 444                 goto truncate_out;
 445         } else if (dn->nid == nid) {
 446                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 447                 goto truncate_out;
 448         }
 449
 450         /* Get the node page */
 451         node_page = f2fs_get_node_page(sbi, nid);
 452         if (IS_ERR(node_page))
 453                 return PTR_ERR(node_page);
 454
 455         offset = ofs_of_node(node_page);
 456         ino = ino_of_node(node_page);
 457         f2fs_put_page(node_page, 1);
 458
 459         if (ino != dn->inode->i_ino) {
 460                 int ret;
 461
 462                 /* Deallocate previous index in the node page */
 463                 inode = f2fs_iget_retry(sbi->sb, ino);
 464                 if (IS_ERR(inode))
 465                         return PTR_ERR(inode);
 466
 467                 ret = dquot_initialize(inode);
 468                 if (ret) {
 469                         iput(inode);
 470                         return ret;
 471                 }
 472         } else {
 473                 inode = dn->inode;
 474         }
 475
 476         bidx = f2fs_start_bidx_of_node(offset, inode) +
 477                                 le16_to_cpu(sum.ofs_in_node);
 478
 479         /*
 480          * if inode page is locked, unlock temporarily, but its reference
 481          * count keeps alive.
 482          */
 483         if (ino == dn->inode->i_ino && dn->inode_page_locked)
 484                 unlock_page(dn->inode_page);
 485
 486         set_new_dnode(&tdn, inode, NULL, NULL, 0);
 487         if (f2fs_get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 488                 goto out;
 489
 490         if (tdn.data_blkaddr == blkaddr)
 491                 f2fs_truncate_data_blocks_range(&tdn, 1);
 492
 493         f2fs_put_dnode(&tdn);
 494 out:
 495         if (ino != dn->inode->i_ino)
 496                 iput(inode);
 497         else if (dn->inode_page_locked)
 498                 lock_page(dn->inode_page);
 499         return 0;
 500
 501 truncate_out:
 502         if (datablock_addr(tdn.inode, tdn.node_page,
 503                                         tdn.ofs_in_node) == blkaddr)
 504                 f2fs_truncate_data_blocks_range(&tdn, 1);
 505         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
 506                 unlock_page(dn->inode_page);
 507         return 0;
 508 }
 509
 510 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 511                                         struct page *page)
 512 {
 513         struct dnode_of_data dn;
 514         struct node_info ni;
 515         unsigned int start, end;
 516         int err = 0, recovered = 0;
 517
 518         /* step 1: recover xattr */
 519         if (IS_INODE(page)) {
 520                 f2fs_recover_inline_xattr(inode, page);
 521         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 522                 err = f2fs_recover_xattr_data(inode, page);
 523                 if (!err)
 524                         recovered++;
 525                 goto out;
 526         }
 527
 528         /* step 2: recover inline data */
 529         if (f2fs_recover_inline_data(inode, page))
 530                 goto out;
 531
 532         /* step 3: recover data indices */
 533         start = f2fs_start_bidx_of_node(ofs_of_node(page), inode);
 534         end = start + ADDRS_PER_PAGE(page, inode);
 535
 536         set_new_dnode(&dn, inode, NULL, NULL, 0);
 537 retry_dn:
 538         err = f2fs_get_dnode_of_data(&dn, start, ALLOC_NODE);
 539         if (err) {
 540                 if (err == -ENOMEM) {
 541                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 542                         goto retry_dn;
 543                 }
 544                 goto out;
 545         }
 546
 547         f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
 548
 549         err = f2fs_get_node_info(sbi, dn.nid, &ni);
 550         if (err)
 551                 goto err;
 552
 553         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 554
 555         if (ofs_of_node(dn.node_page) != ofs_of_node(page)) {
 556                 f2fs_msg(sbi->sb, KERN_WARNING,
 557                         "Inconsistent ofs_of_node, ino:%lu, ofs:%u, %u",
 558                         inode->i_ino, ofs_of_node(dn.node_page),
 559                         ofs_of_node(page));
 560                 err = -EFAULT;
 561                 goto err;
 562         }
 563
 564         for (; start < end; start++, dn.ofs_in_node++) {
 565                 block_t src, dest;
 566
 567                 src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
 568                 dest = datablock_addr(dn.inode, page, dn.ofs_in_node);
 569
 570                 if (__is_valid_data_blkaddr(src) &&
 571                         !f2fs_is_valid_blkaddr(sbi, src, META_POR)) {
 572                         err = -EFAULT;
 573                         goto err;
 574                 }
 575
 576                 if (__is_valid_data_blkaddr(dest) &&
 577                         !f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
 578                         err = -EFAULT;
 579                         goto err;
 580                 }
 581
 582                 /* skip recovering if dest is the same as src */
 583                 if (src == dest)
 584                         continue;
 585
 586                 /* dest is invalid, just invalidate src block */
 587                 if (dest == NULL_ADDR) {
 588                         f2fs_truncate_data_blocks_range(&dn, 1);
 589                         continue;
 590                 }
 591
 592                 if (!file_keep_isize(inode) &&
 593                         (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
 594                         f2fs_i_size_write(inode,
 595                                 (loff_t)(start + 1) << PAGE_SHIFT);
 596
 597                 /*
 598                  * dest is reserved block, invalidate src block
 599                  * and then reserve one new block in dnode page.
 600                  */
 601                 if (dest == NEW_ADDR) {
 602                         f2fs_truncate_data_blocks_range(&dn, 1);
 603                         f2fs_reserve_new_block(&dn);
 604                         continue;
 605                 }
 606
 607                 /* dest is valid block, try to recover from src to dest */
 608                 if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
 609
 610                         if (src == NULL_ADDR) {
 611                                 err = f2fs_reserve_new_block(&dn);
 612                                 while (err &&
 613                                        IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION))
 614                                         err = f2fs_reserve_new_block(&dn);
 615                                 /* We should not get -ENOSPC */
 616                                 f2fs_bug_on(sbi, err);
 617                                 if (err)
 618                                         goto err;
 619                         }
 620 retry_prev:
 621                         /* Check the previous node page having this index */
 622                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 623                         if (err) {
 624                                 if (err == -ENOMEM) {
 625                                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 626                                         goto retry_prev;
 627                                 }
 628                                 goto err;
 629                         }
 630
 631                         /* write dummy data page */
 632                         f2fs_replace_block(sbi, &dn, src, dest,
 633                                                 ni.version, false, false);
 634                         recovered++;
 635                 }
 636         }
 637
 638         copy_node_footer(dn.node_page, page);
 639         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 640                                         ofs_of_node(page), false);
 641         set_page_dirty(dn.node_page);
 642 err:
 643         f2fs_put_dnode(&dn);
 644 out:
 645         f2fs_msg(sbi->sb, KERN_NOTICE,
 646                 "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
 647                 inode->i_ino,
 648                 file_keep_isize(inode) ? "keep" : "recover",
 649                 recovered, err);
 650         return err;
 651 }
 652
 653 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
 654                 struct list_head *tmp_inode_list, struct list_head *dir_list)
 655 {
 656         struct curseg_info *curseg;
 657         struct page *page = NULL;
 658         int err = 0;
 659         block_t blkaddr;
 660
 661         /* get node pages in the current segment */
 662         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 663         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 664
 665         while (1) {
 666                 struct fsync_inode_entry *entry;
 667
 668                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
 669                         break;
 670
 671                 f2fs_ra_meta_pages_cond(sbi, blkaddr);
 672
 673                 page = f2fs_get_tmp_page(sbi, blkaddr);
 674                 if (IS_ERR(page)) {
 675                         err = PTR_ERR(page);
 676                         break;
 677                 }
 678
 679                 if (!is_recoverable_dnode(page)) {
 680                         f2fs_put_page(page, 1);
 681                         break;
 682                 }
 683
 684                 entry = get_fsync_inode(inode_list, ino_of_node(page));
 685                 if (!entry)
 686                         goto next;
 687                 /*
 688                  * inode(x) | CP | inode(x) | dnode(F)
 689                  * In this case, we can lose the latest inode(x).
 690                  * So, call recover_inode for the inode update.
 691                  */
 692                 if (IS_INODE(page)) {
 693                         err = recover_inode(entry->inode, page);
 694                         if (err) {
 695                                 f2fs_put_page(page, 1);
 696                                 break;
 697                         }
 698                 }
 699                 if (entry->last_dentry == blkaddr) {
 700                         err = recover_dentry(entry->inode, page, dir_list);
 701                         if (err) {
 702                                 f2fs_put_page(page, 1);
 703                                 break;
 704                         }
 705                 }
 706                 err = do_recover_data(sbi, entry->inode, page);
 707                 if (err) {
 708                         f2fs_put_page(page, 1);
 709                         break;
 710                 }
 711
 712                 if (entry->blkaddr == blkaddr)
 713                         list_move_tail(&entry->list, tmp_inode_list);
 714 next:
 715                 /* check next segment */
 716                 blkaddr = next_blkaddr_of_node(page);
 717                 f2fs_put_page(page, 1);
 718         }
 719         if (!err)
 720                 f2fs_allocate_new_segments(sbi);
 721         return err;
 722 }
 723
 724 int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
 725 {
 726         struct list_head inode_list, tmp_inode_list;
 727         struct list_head dir_list;
 728         int err;
 729         int ret = 0;
 730         unsigned long s_flags = sbi->sb->s_flags;
 731         bool need_writecp = false;
 732 #ifdef CONFIG_QUOTA
 733         int quota_enabled;
 734 #endif
 735
 736         if (s_flags & SB_RDONLY) {
 737                 f2fs_msg(sbi->sb, KERN_INFO,
 738                                 "recover fsync data on readonly fs");
 739                 sbi->sb->s_flags &= ~SB_RDONLY;
 740         }
 741
 742 #ifdef CONFIG_QUOTA
 743         /* Needed for iput() to work correctly and not trash data */
 744         sbi->sb->s_flags |= SB_ACTIVE;
 745         /* Turn on quotas so that they are updated correctly */
 746         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
 747 #endif
 748
 749         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 750                         sizeof(struct fsync_inode_entry));
 751         if (!fsync_entry_slab) {
 752                 err = -ENOMEM;
 753                 goto out;
 754         }
 755
 756         INIT_LIST_HEAD(&inode_list);
 757         INIT_LIST_HEAD(&tmp_inode_list);
 758         INIT_LIST_HEAD(&dir_list);
 759
 760         /* prevent checkpoint */
 761         mutex_lock(&sbi->cp_mutex);
 762
 763         /* step #1: find fsynced inode numbers */
 764         err = find_fsync_dnodes(sbi, &inode_list, check_only);
 765         if (err || list_empty(&inode_list))
 766                 goto skip;
 767
 768         if (check_only) {
 769                 ret = 1;
 770                 goto skip;
 771         }
 772
 773         need_writecp = true;
 774
 775         /* step #2: recover data */
 776         err = recover_data(sbi, &inode_list, &tmp_inode_list, &dir_list);
 777         if (!err)
 778                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 779         else {
 780                 /* restore s_flags to let iput() trash data */
 781                 sbi->sb->s_flags = s_flags;
 782         }
 783 skip:
 784         destroy_fsync_dnodes(&inode_list, err);
 785         destroy_fsync_dnodes(&tmp_inode_list, err);
 786
 787         /* truncate meta pages to be used by the recovery */
 788         truncate_inode_pages_range(META_MAPPING(sbi),
 789                         (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
 790
 791         if (err) {
 792                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 793                 truncate_inode_pages_final(META_MAPPING(sbi));
 794         } else {
 795                 clear_sbi_flag(sbi, SBI_POR_DOING);
 796         }
 797         mutex_unlock(&sbi->cp_mutex);
 798
 799         /* let's drop all the directory inodes for clean checkpoint */
 800         destroy_fsync_dnodes(&dir_list, err);
 801
 802         if (need_writecp) {
 803                 set_sbi_flag(sbi, SBI_IS_RECOVERED);
 804
 805                 if (!err) {
 806                         struct cp_control cpc = {
 807                                 .reason = CP_RECOVERY,
 808                         };
 809                         err = f2fs_write_checkpoint(sbi, &cpc);
 810                 }
 811         }
 812
 813         kmem_cache_destroy(fsync_entry_slab);
 814 out:
 815 #ifdef CONFIG_QUOTA
 816         /* Turn quotas off */
 817         if (quota_enabled)
 818                 f2fs_quota_off_umount(sbi->sb);
 819 #endif
 820         sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
 821
 822         return ret ? ret: err;
 823 }