fs/f2fs/recovery.c

   1 /*
   2  * fs/f2fs/recovery.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include "f2fs.h"
  14 #include "node.h"
  15 #include "segment.h"
  16
  17 static struct kmem_cache *fsync_entry_slab;
  18
  19 bool space_for_roll_forward(struct f2fs_sb_info *sbi)
  20 {
  21         if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
  22                         > sbi->user_block_count)
  23                 return false;
  24         return true;
  25 }
  26
  27 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
  28                                                                 nid_t ino)
  29 {
  30         struct fsync_inode_entry *entry;
  31
  32         list_for_each_entry(entry, head, list)
  33                 if (entry->inode->i_ino == ino)
  34                         return entry;
  35
  36         return NULL;
  37 }
  38
  39 static int recover_dentry(struct page *ipage, struct inode *inode)
  40 {
  41         struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
  42         nid_t pino = le32_to_cpu(raw_inode->i_pino);
  43         struct f2fs_dir_entry *de;
  44         struct qstr name;
  45         struct page *page;
  46         struct inode *dir, *einode;
  47         int err = 0;
  48
  49         dir = f2fs_iget(inode->i_sb, pino);
  50         if (IS_ERR(dir)) {
  51                 err = PTR_ERR(dir);
  52                 goto out;
  53         }
  54
  55         name.len = le32_to_cpu(raw_inode->i_namelen);
  56         name.name = raw_inode->i_name;
  57
  58         if (unlikely(name.len > F2FS_NAME_LEN)) {
  59                 WARN_ON(1);
  60                 err = -ENAMETOOLONG;
  61                 goto out_err;
  62         }
  63 retry:
  64         de = f2fs_find_entry(dir, &name, &page);
  65         if (de && inode->i_ino == le32_to_cpu(de->ino))
  66                 goto out_unmap_put;
  67         if (de) {
  68                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
  69                 if (IS_ERR(einode)) {
  70                         WARN_ON(1);
  71                         err = PTR_ERR(einode);
  72                         if (err == -ENOENT)
  73                                 err = -EEXIST;
  74                         goto out_unmap_put;
  75                 }
  76                 err = acquire_orphan_inode(F2FS_SB(inode->i_sb));
  77                 if (err) {
  78                         iput(einode);
  79                         goto out_unmap_put;
  80                 }
  81                 f2fs_delete_entry(de, page, einode);
  82                 iput(einode);
  83                 goto retry;
  84         }
  85         err = __f2fs_add_link(dir, &name, inode);
  86         if (err)
  87                 goto out_err;
  88
  89         if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) {
  90                 iput(dir);
  91         } else {
  92                 add_dirty_dir_inode(dir);
  93                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
  94         }
  95
  96         goto out;
  97
  98 out_unmap_put:
  99         kunmap(page);
 100         f2fs_put_page(page, 0);
 101 out_err:
 102         iput(dir);
 103 out:
 104         f2fs_msg(inode->i_sb, KERN_NOTICE,
 105                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 106                         __func__, ino_of_node(ipage), raw_inode->i_name,
 107                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 108         return err;
 109 }
 110
 111 static int recover_inode(struct inode *inode, struct page *node_page)
 112 {
 113         struct f2fs_inode *raw_inode = F2FS_INODE(node_page);
 114
 115         if (!IS_INODE(node_page))
 116                 return 0;
 117
 118         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
 119         i_size_write(inode, le64_to_cpu(raw_inode->i_size));
 120         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 121         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
 122         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 123         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 124         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
 125         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 126
 127         if (is_dent_dnode(node_page))
 128                 return recover_dentry(node_page, inode);
 129
 130         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 131                         ino_of_node(node_page), raw_inode->i_name);
 132         return 0;
 133 }
 134
 135 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 136 {
 137         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 138         struct curseg_info *curseg;
 139         struct page *page;
 140         block_t blkaddr;
 141         int err = 0;
 142
 143         /* get node pages in the current segment */
 144         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 145         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 146
 147         /* read node page */
 148         page = alloc_page(GFP_F2FS_ZERO);
 149         if (!page)
 150                 return -ENOMEM;
 151         lock_page(page);
 152
 153         while (1) {
 154                 struct fsync_inode_entry *entry;
 155
 156                 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC);
 157                 if (err)
 158                         return err;
 159
 160                 lock_page(page);
 161
 162                 if (cp_ver != cpver_of_node(page))
 163                         break;
 164
 165                 if (!is_fsync_dnode(page))
 166                         goto next;
 167
 168                 entry = get_fsync_inode(head, ino_of_node(page));
 169                 if (entry) {
 170                         if (IS_INODE(page) && is_dent_dnode(page))
 171                                 set_inode_flag(F2FS_I(entry->inode),
 172                                                         FI_INC_LINK);
 173                 } else {
 174                         if (IS_INODE(page) && is_dent_dnode(page)) {
 175                                 err = recover_inode_page(sbi, page);
 176                                 if (err)
 177                                         break;
 178                         }
 179
 180                         /* add this fsync inode to the list */
 181                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
 182                         if (!entry) {
 183                                 err = -ENOMEM;
 184                                 break;
 185                         }
 186
 187                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 188                         if (IS_ERR(entry->inode)) {
 189                                 err = PTR_ERR(entry->inode);
 190                                 kmem_cache_free(fsync_entry_slab, entry);
 191                                 break;
 192                         }
 193                         list_add_tail(&entry->list, head);
 194                 }
 195                 entry->blkaddr = blkaddr;
 196
 197                 err = recover_inode(entry->inode, page);
 198                 if (err && err != -ENOENT)
 199                         break;
 200 next:
 201                 /* check next segment */
 202                 blkaddr = next_blkaddr_of_node(page);
 203         }
 204
 205         unlock_page(page);
 206         __free_pages(page, 0);
 207
 208         return err;
 209 }
 210
 211 static void destroy_fsync_dnodes(struct list_head *head)
 212 {
 213         struct fsync_inode_entry *entry, *tmp;
 214
 215         list_for_each_entry_safe(entry, tmp, head, list) {
 216                 iput(entry->inode);
 217                 list_del(&entry->list);
 218                 kmem_cache_free(fsync_entry_slab, entry);
 219         }
 220 }
 221
 222 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 223                         block_t blkaddr, struct dnode_of_data *dn)
 224 {
 225         struct seg_entry *sentry;
 226         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 227         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 228         struct f2fs_summary_block *sum_node;
 229         struct f2fs_summary sum;
 230         struct page *sum_page, *node_page;
 231         nid_t ino, nid;
 232         struct inode *inode;
 233         unsigned int offset;
 234         block_t bidx;
 235         int i;
 236
 237         sentry = get_seg_entry(sbi, segno);
 238         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 239                 return 0;
 240
 241         /* Get the previous summary */
 242         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 243                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 244                 if (curseg->segno == segno) {
 245                         sum = curseg->sum_blk->entries[blkoff];
 246                         goto got_it;
 247                 }
 248         }
 249
 250         sum_page = get_sum_page(sbi, segno);
 251         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 252         sum = sum_node->entries[blkoff];
 253         f2fs_put_page(sum_page, 1);
 254 got_it:
 255         /* Use the locked dnode page and inode */
 256         nid = le32_to_cpu(sum.nid);
 257         if (dn->inode->i_ino == nid) {
 258                 struct dnode_of_data tdn = *dn;
 259                 tdn.nid = nid;
 260                 tdn.node_page = dn->inode_page;
 261                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 262                 truncate_data_blocks_range(&tdn, 1);
 263                 return 0;
 264         } else if (dn->nid == nid) {
 265                 struct dnode_of_data tdn = *dn;
 266                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 267                 truncate_data_blocks_range(&tdn, 1);
 268                 return 0;
 269         }
 270
 271         /* Get the node page */
 272         node_page = get_node_page(sbi, nid);
 273         if (IS_ERR(node_page))
 274                 return PTR_ERR(node_page);
 275
 276         offset = ofs_of_node(node_page);
 277         ino = ino_of_node(node_page);
 278         f2fs_put_page(node_page, 1);
 279
 280         /* Deallocate previous index in the node page */
 281         inode = f2fs_iget(sbi->sb, ino);
 282         if (IS_ERR(inode))
 283                 return PTR_ERR(inode);
 284
 285         bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
 286                                         le16_to_cpu(sum.ofs_in_node);
 287
 288         truncate_hole(inode, bidx, bidx + 1);
 289         iput(inode);
 290         return 0;
 291 }
 292
 293 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 294                                         struct page *page, block_t blkaddr)
 295 {
 296         struct f2fs_inode_info *fi = F2FS_I(inode);
 297         unsigned int start, end;
 298         struct dnode_of_data dn;
 299         struct f2fs_summary sum;
 300         struct node_info ni;
 301         int err = 0, recovered = 0;
 302
 303         if (recover_inline_data(inode, page))
 304                 goto out;
 305
 306         if (recover_xattr_data(inode, page, blkaddr))
 307                 goto out;
 308
 309         start = start_bidx_of_node(ofs_of_node(page), fi);
 310         end = start + ADDRS_PER_PAGE(page, fi);
 311
 312         f2fs_lock_op(sbi);
 313
 314         set_new_dnode(&dn, inode, NULL, NULL, 0);
 315
 316         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 317         if (err) {
 318                 f2fs_unlock_op(sbi);
 319                 goto out;
 320         }
 321
 322         f2fs_wait_on_page_writeback(dn.node_page, NODE);
 323
 324         get_node_info(sbi, dn.nid, &ni);
 325         f2fs_bug_on(ni.ino != ino_of_node(page));
 326         f2fs_bug_on(ofs_of_node(dn.node_page) != ofs_of_node(page));
 327
 328         for (; start < end; start++) {
 329                 block_t src, dest;
 330
 331                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 332                 dest = datablock_addr(page, dn.ofs_in_node);
 333
 334                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 335                         if (src == NULL_ADDR) {
 336                                 err = reserve_new_block(&dn);
 337                                 /* We should not get -ENOSPC */
 338                                 f2fs_bug_on(err);
 339                         }
 340
 341                         /* Check the previous node page having this index */
 342                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 343                         if (err)
 344                                 goto err;
 345
 346                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 347
 348                         /* write dummy data page */
 349                         recover_data_page(sbi, NULL, &sum, src, dest);
 350                         update_extent_cache(dest, &dn);
 351                         recovered++;
 352                 }
 353                 dn.ofs_in_node++;
 354         }
 355
 356         /* write node page in place */
 357         set_summary(&sum, dn.nid, 0, 0);
 358         if (IS_INODE(dn.node_page))
 359                 sync_inode_page(&dn);
 360
 361         copy_node_footer(dn.node_page, page);
 362         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 363                                         ofs_of_node(page), false);
 364         set_page_dirty(dn.node_page);
 365
 366         recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
 367 err:
 368         f2fs_put_dnode(&dn);
 369         f2fs_unlock_op(sbi);
 370 out:
 371         f2fs_msg(sbi->sb, KERN_NOTICE,
 372                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 373                 inode->i_ino, recovered, err);
 374         return err;
 375 }
 376
 377 static int recover_data(struct f2fs_sb_info *sbi,
 378                                 struct list_head *head, int type)
 379 {
 380         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 381         struct curseg_info *curseg;
 382         struct page *page;
 383         int err = 0;
 384         block_t blkaddr;
 385
 386         /* get node pages in the current segment */
 387         curseg = CURSEG_I(sbi, type);
 388         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 389
 390         /* read node page */
 391         page = alloc_page(GFP_F2FS_ZERO);
 392         if (!page)
 393                 return -ENOMEM;
 394
 395         lock_page(page);
 396
 397         while (1) {
 398                 struct fsync_inode_entry *entry;
 399
 400                 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC);
 401                 if (err)
 402                         return err;
 403
 404                 lock_page(page);
 405
 406                 if (cp_ver != cpver_of_node(page))
 407                         break;
 408
 409                 entry = get_fsync_inode(head, ino_of_node(page));
 410                 if (!entry)
 411                         goto next;
 412
 413                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 414                 if (err)
 415                         break;
 416
 417                 if (entry->blkaddr == blkaddr) {
 418                         iput(entry->inode);
 419                         list_del(&entry->list);
 420                         kmem_cache_free(fsync_entry_slab, entry);
 421                 }
 422 next:
 423                 /* check next segment */
 424                 blkaddr = next_blkaddr_of_node(page);
 425         }
 426
 427         unlock_page(page);
 428         __free_pages(page, 0);
 429
 430         if (!err)
 431                 allocate_new_segments(sbi);
 432         return err;
 433 }
 434
 435 int recover_fsync_data(struct f2fs_sb_info *sbi)
 436 {
 437         struct list_head inode_list;
 438         int err;
 439         bool need_writecp = false;
 440
 441         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 442                         sizeof(struct fsync_inode_entry));
 443         if (!fsync_entry_slab)
 444                 return -ENOMEM;
 445
 446         INIT_LIST_HEAD(&inode_list);
 447
 448         /* step #1: find fsynced inode numbers */
 449         sbi->por_doing = true;
 450         err = find_fsync_dnodes(sbi, &inode_list);
 451         if (err)
 452                 goto out;
 453
 454         if (list_empty(&inode_list))
 455                 goto out;
 456
 457         need_writecp = true;
 458
 459         /* step #2: recover data */
 460         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 461         f2fs_bug_on(!list_empty(&inode_list));
 462 out:
 463         destroy_fsync_dnodes(&inode_list);
 464         kmem_cache_destroy(fsync_entry_slab);
 465         sbi->por_doing = false;
 466         if (!err && need_writecp)
 467                 write_checkpoint(sbi, false);
 468         return err;
 469 }