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 list_head *this;
  31         struct fsync_inode_entry *entry;
  32
  33         list_for_each(this, head) {
  34                 entry = list_entry(this, struct fsync_inode_entry, list);
  35                 if (entry->inode->i_ino == ino)
  36                         return entry;
  37         }
  38         return NULL;
  39 }
  40
  41 static int recover_dentry(struct page *ipage, struct inode *inode)
  42 {
  43         struct f2fs_node *raw_node = F2FS_NODE(ipage);
  44         struct f2fs_inode *raw_inode = &(raw_node->i);
  45         nid_t pino = le32_to_cpu(raw_inode->i_pino);
  46         struct f2fs_dir_entry *de;
  47         struct qstr name;
  48         struct page *page;
  49         struct inode *dir, *einode;
  50         int err = 0;
  51
  52         dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
  53         if (!dir) {
  54                 dir = f2fs_iget(inode->i_sb, pino);
  55                 if (IS_ERR(dir)) {
  56                         err = PTR_ERR(dir);
  57                         goto out;
  58                 }
  59                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
  60                 add_dirty_dir_inode(dir);
  61         }
  62
  63         name.len = le32_to_cpu(raw_inode->i_namelen);
  64         name.name = raw_inode->i_name;
  65 retry:
  66         de = f2fs_find_entry(dir, &name, &page);
  67         if (de && inode->i_ino == le32_to_cpu(de->ino))
  68                 goto out_unmap_put;
  69         if (de) {
  70                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
  71                 if (IS_ERR(einode)) {
  72                         WARN_ON(1);
  73                         if (PTR_ERR(einode) == -ENOENT)
  74                                 err = -EEXIST;
  75                         goto out_unmap_put;
  76                 }
  77                 err = acquire_orphan_inode(F2FS_SB(inode->i_sb));
  78                 if (err) {
  79                         iput(einode);
  80                         goto out_unmap_put;
  81                 }
  82                 f2fs_delete_entry(de, page, einode);
  83                 iput(einode);
  84                 goto retry;
  85         }
  86         err = __f2fs_add_link(dir, &name, inode);
  87         goto out;
  88
  89 out_unmap_put:
  90         kunmap(page);
  91         f2fs_put_page(page, 0);
  92 out:
  93         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
  94                         "ino = %x, name = %s, dir = %lx, err = %d",
  95                         ino_of_node(ipage), raw_inode->i_name,
  96                         IS_ERR(dir) ? 0 : dir->i_ino, err);
  97         return err;
  98 }
  99
 100 static int recover_inode(struct inode *inode, struct page *node_page)
 101 {
 102         struct f2fs_node *raw_node = F2FS_NODE(node_page);
 103         struct f2fs_inode *raw_inode = &(raw_node->i);
 104
 105         if (!IS_INODE(node_page))
 106                 return 0;
 107
 108         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
 109         i_size_write(inode, le64_to_cpu(raw_inode->i_size));
 110         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 111         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
 112         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 113         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 114         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
 115         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 116
 117         if (is_dent_dnode(node_page))
 118                 return recover_dentry(node_page, inode);
 119
 120         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 121                         ino_of_node(node_page), raw_inode->i_name);
 122         return 0;
 123 }
 124
 125 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 126 {
 127         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 128         struct curseg_info *curseg;
 129         struct page *page;
 130         block_t blkaddr;
 131         int err = 0;
 132
 133         /* get node pages in the current segment */
 134         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 135         blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
 136
 137         /* read node page */
 138         page = alloc_page(GFP_F2FS_ZERO);
 139         if (!page)
 140                 return -ENOMEM;
 141         lock_page(page);
 142
 143         while (1) {
 144                 struct fsync_inode_entry *entry;
 145
 146                 err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
 147                 if (err)
 148                         goto out;
 149
 150                 lock_page(page);
 151
 152                 if (cp_ver != cpver_of_node(page))
 153                         break;
 154
 155                 if (!is_fsync_dnode(page))
 156                         goto next;
 157
 158                 entry = get_fsync_inode(head, ino_of_node(page));
 159                 if (entry) {
 160                         if (IS_INODE(page) && is_dent_dnode(page))
 161                                 set_inode_flag(F2FS_I(entry->inode),
 162                                                         FI_INC_LINK);
 163                 } else {
 164                         if (IS_INODE(page) && is_dent_dnode(page)) {
 165                                 err = recover_inode_page(sbi, page);
 166                                 if (err)
 167                                         break;
 168                         }
 169
 170                         /* add this fsync inode to the list */
 171                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
 172                         if (!entry) {
 173                                 err = -ENOMEM;
 174                                 break;
 175                         }
 176
 177                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 178                         if (IS_ERR(entry->inode)) {
 179                                 err = PTR_ERR(entry->inode);
 180                                 kmem_cache_free(fsync_entry_slab, entry);
 181                                 break;
 182                         }
 183                         list_add_tail(&entry->list, head);
 184                 }
 185                 entry->blkaddr = blkaddr;
 186
 187                 err = recover_inode(entry->inode, page);
 188                 if (err && err != -ENOENT)
 189                         break;
 190 next:
 191                 /* check next segment */
 192                 blkaddr = next_blkaddr_of_node(page);
 193         }
 194         unlock_page(page);
 195 out:
 196         __free_pages(page, 0);
 197         return err;
 198 }
 199
 200 static void destroy_fsync_dnodes(struct list_head *head)
 201 {
 202         struct fsync_inode_entry *entry, *tmp;
 203
 204         list_for_each_entry_safe(entry, tmp, head, list) {
 205                 iput(entry->inode);
 206                 list_del(&entry->list);
 207                 kmem_cache_free(fsync_entry_slab, entry);
 208         }
 209 }
 210
 211 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 212                         block_t blkaddr, struct dnode_of_data *dn)
 213 {
 214         struct seg_entry *sentry;
 215         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 216         unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
 217                                         (sbi->blocks_per_seg - 1);
 218         struct f2fs_summary sum;
 219         nid_t ino, nid;
 220         void *kaddr;
 221         struct inode *inode;
 222         struct page *node_page;
 223         unsigned int offset;
 224         block_t bidx;
 225         int i;
 226
 227         sentry = get_seg_entry(sbi, segno);
 228         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 229                 return 0;
 230
 231         /* Get the previous summary */
 232         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 233                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 234                 if (curseg->segno == segno) {
 235                         sum = curseg->sum_blk->entries[blkoff];
 236                         break;
 237                 }
 238         }
 239         if (i > CURSEG_COLD_DATA) {
 240                 struct page *sum_page = get_sum_page(sbi, segno);
 241                 struct f2fs_summary_block *sum_node;
 242                 kaddr = page_address(sum_page);
 243                 sum_node = (struct f2fs_summary_block *)kaddr;
 244                 sum = sum_node->entries[blkoff];
 245                 f2fs_put_page(sum_page, 1);
 246         }
 247
 248         /* Use the locked dnode page and inode */
 249         nid = le32_to_cpu(sum.nid);
 250         if (dn->inode->i_ino == nid) {
 251                 struct dnode_of_data tdn = *dn;
 252                 tdn.nid = nid;
 253                 tdn.node_page = dn->inode_page;
 254                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 255                 truncate_data_blocks_range(&tdn, 1);
 256                 return 0;
 257         } else if (dn->nid == nid) {
 258                 struct dnode_of_data tdn = *dn;
 259                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 260                 truncate_data_blocks_range(&tdn, 1);
 261                 return 0;
 262         }
 263
 264         /* Get the node page */
 265         node_page = get_node_page(sbi, nid);
 266         if (IS_ERR(node_page))
 267                 return PTR_ERR(node_page);
 268
 269         offset = ofs_of_node(node_page);
 270         ino = ino_of_node(node_page);
 271         f2fs_put_page(node_page, 1);
 272
 273         /* Deallocate previous index in the node page */
 274         inode = f2fs_iget(sbi->sb, ino);
 275         if (IS_ERR(inode))
 276                 return PTR_ERR(inode);
 277
 278         bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
 279                                         le16_to_cpu(sum.ofs_in_node);
 280
 281         truncate_hole(inode, bidx, bidx + 1);
 282         iput(inode);
 283         return 0;
 284 }
 285
 286 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 287                                         struct page *page, block_t blkaddr)
 288 {
 289         struct f2fs_inode_info *fi = F2FS_I(inode);
 290         unsigned int start, end;
 291         struct dnode_of_data dn;
 292         struct f2fs_summary sum;
 293         struct node_info ni;
 294         int err = 0, recovered = 0;
 295
 296         start = start_bidx_of_node(ofs_of_node(page), fi);
 297         if (IS_INODE(page))
 298                 end = start + ADDRS_PER_INODE(fi);
 299         else
 300                 end = start + ADDRS_PER_BLOCK;
 301
 302         f2fs_lock_op(sbi);
 303         set_new_dnode(&dn, inode, NULL, NULL, 0);
 304
 305         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 306         if (err) {
 307                 f2fs_unlock_op(sbi);
 308                 return err;
 309         }
 310
 311         wait_on_page_writeback(dn.node_page);
 312
 313         get_node_info(sbi, dn.nid, &ni);
 314         f2fs_bug_on(ni.ino != ino_of_node(page));
 315         f2fs_bug_on(ofs_of_node(dn.node_page) != ofs_of_node(page));
 316
 317         for (; start < end; start++) {
 318                 block_t src, dest;
 319
 320                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 321                 dest = datablock_addr(page, dn.ofs_in_node);
 322
 323                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 324                         if (src == NULL_ADDR) {
 325                                 err = reserve_new_block(&dn);
 326                                 /* We should not get -ENOSPC */
 327                                 f2fs_bug_on(err);
 328                         }
 329
 330                         /* Check the previous node page having this index */
 331                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 332                         if (err)
 333                                 goto err;
 334
 335                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 336
 337                         /* write dummy data page */
 338                         recover_data_page(sbi, NULL, &sum, src, dest);
 339                         update_extent_cache(dest, &dn);
 340                         recovered++;
 341                 }
 342                 dn.ofs_in_node++;
 343         }
 344
 345         /* write node page in place */
 346         set_summary(&sum, dn.nid, 0, 0);
 347         if (IS_INODE(dn.node_page))
 348                 sync_inode_page(&dn);
 349
 350         copy_node_footer(dn.node_page, page);
 351         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 352                                         ofs_of_node(page), false);
 353         set_page_dirty(dn.node_page);
 354
 355         recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
 356 err:
 357         f2fs_put_dnode(&dn);
 358         f2fs_unlock_op(sbi);
 359
 360         f2fs_msg(sbi->sb, KERN_NOTICE, "recover_data: ino = %lx, "
 361                         "recovered_data = %d blocks, err = %d",
 362                         inode->i_ino, recovered, err);
 363         return err;
 364 }
 365
 366 static int recover_data(struct f2fs_sb_info *sbi,
 367                                 struct list_head *head, int type)
 368 {
 369         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 370         struct curseg_info *curseg;
 371         struct page *page;
 372         int err = 0;
 373         block_t blkaddr;
 374
 375         /* get node pages in the current segment */
 376         curseg = CURSEG_I(sbi, type);
 377         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 378
 379         /* read node page */
 380         page = alloc_page(GFP_NOFS | __GFP_ZERO);
 381         if (!page)
 382                 return -ENOMEM;
 383
 384         lock_page(page);
 385
 386         while (1) {
 387                 struct fsync_inode_entry *entry;
 388
 389                 err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
 390                 if (err)
 391                         goto out;
 392
 393                 lock_page(page);
 394
 395                 if (cp_ver != cpver_of_node(page))
 396                         break;
 397
 398                 entry = get_fsync_inode(head, ino_of_node(page));
 399                 if (!entry)
 400                         goto next;
 401
 402                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 403                 if (err)
 404                         break;
 405
 406                 if (entry->blkaddr == blkaddr) {
 407                         iput(entry->inode);
 408                         list_del(&entry->list);
 409                         kmem_cache_free(fsync_entry_slab, entry);
 410                 }
 411 next:
 412                 /* check next segment */
 413                 blkaddr = next_blkaddr_of_node(page);
 414         }
 415         unlock_page(page);
 416 out:
 417         __free_pages(page, 0);
 418
 419         if (!err)
 420                 allocate_new_segments(sbi);
 421         return err;
 422 }
 423
 424 int recover_fsync_data(struct f2fs_sb_info *sbi)
 425 {
 426         struct list_head inode_list;
 427         int err;
 428         bool need_writecp = false;
 429
 430         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 431                         sizeof(struct fsync_inode_entry), NULL);
 432         if (unlikely(!fsync_entry_slab))
 433                 return -ENOMEM;
 434
 435         INIT_LIST_HEAD(&inode_list);
 436
 437         /* step #1: find fsynced inode numbers */
 438         sbi->por_doing = true;
 439         err = find_fsync_dnodes(sbi, &inode_list);
 440         if (err)
 441                 goto out;
 442
 443         if (list_empty(&inode_list))
 444                 goto out;
 445
 446         need_writecp = true;
 447
 448         /* step #2: recover data */
 449         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 450         f2fs_bug_on(!list_empty(&inode_list));
 451 out:
 452         destroy_fsync_dnodes(&inode_list);
 453         kmem_cache_destroy(fsync_entry_slab);
 454         sbi->por_doing = false;
 455         if (!err && need_writecp)
 456                 write_checkpoint(sbi, false);
 457         return err;
 458 }