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_inode *raw_inode = F2FS_INODE(ipage);
  44         nid_t pino = le32_to_cpu(raw_inode->i_pino);
  45         struct f2fs_dir_entry *de;
  46         struct qstr name;
  47         struct page *page;
  48         struct inode *dir, *einode;
  49         int err = 0;
  50
  51         dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
  52         if (!dir) {
  53                 dir = f2fs_iget(inode->i_sb, pino);
  54                 if (IS_ERR(dir)) {
  55                         err = PTR_ERR(dir);
  56                         goto out;
  57                 }
  58                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
  59                 add_dirty_dir_inode(dir);
  60         }
  61
  62         name.len = le32_to_cpu(raw_inode->i_namelen);
  63         name.name = raw_inode->i_name;
  64
  65         if (unlikely(name.len > F2FS_NAME_LEN)) {
  66                 WARN_ON(1);
  67                 err = -ENAMETOOLONG;
  68                 goto out;
  69         }
  70 retry:
  71         de = f2fs_find_entry(dir, &name, &page);
  72         if (de && inode->i_ino == le32_to_cpu(de->ino))
  73                 goto out_unmap_put;
  74         if (de) {
  75                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
  76                 if (IS_ERR(einode)) {
  77                         WARN_ON(1);
  78                         if (PTR_ERR(einode) == -ENOENT)
  79                                 err = -EEXIST;
  80                         goto out_unmap_put;
  81                 }
  82                 err = acquire_orphan_inode(F2FS_SB(inode->i_sb));
  83                 if (err) {
  84                         iput(einode);
  85                         goto out_unmap_put;
  86                 }
  87                 f2fs_delete_entry(de, page, einode);
  88                 iput(einode);
  89                 goto retry;
  90         }
  91         err = __f2fs_add_link(dir, &name, inode);
  92         goto out;
  93
  94 out_unmap_put:
  95         kunmap(page);
  96         f2fs_put_page(page, 0);
  97 out:
  98         f2fs_msg(inode->i_sb, KERN_NOTICE,
  99                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 100                         __func__, ino_of_node(ipage), raw_inode->i_name,
 101                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 102         return err;
 103 }
 104
 105 static int recover_inode(struct inode *inode, struct page *node_page)
 106 {
 107         struct f2fs_inode *raw_inode = F2FS_INODE(node_page);
 108
 109         if (!IS_INODE(node_page))
 110                 return 0;
 111
 112         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
 113         i_size_write(inode, le64_to_cpu(raw_inode->i_size));
 114         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 115         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
 116         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 117         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 118         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
 119         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 120
 121         if (is_dent_dnode(node_page))
 122                 return recover_dentry(node_page, inode);
 123
 124         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 125                         ino_of_node(node_page), raw_inode->i_name);
 126         return 0;
 127 }
 128
 129 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 130 {
 131         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 132         struct curseg_info *curseg;
 133         struct page *page;
 134         block_t blkaddr;
 135         int err = 0;
 136
 137         /* get node pages in the current segment */
 138         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 139         blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
 140
 141         /* read node page */
 142         page = alloc_page(GFP_F2FS_ZERO);
 143         if (!page)
 144                 return -ENOMEM;
 145         lock_page(page);
 146
 147         while (1) {
 148                 struct fsync_inode_entry *entry;
 149
 150                 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC);
 151                 if (err)
 152                         return err;
 153
 154                 lock_page(page);
 155
 156                 if (cp_ver != cpver_of_node(page))
 157                         break;
 158
 159                 if (!is_fsync_dnode(page))
 160                         goto next;
 161
 162                 entry = get_fsync_inode(head, ino_of_node(page));
 163                 if (entry) {
 164                         if (IS_INODE(page) && is_dent_dnode(page))
 165                                 set_inode_flag(F2FS_I(entry->inode),
 166                                                         FI_INC_LINK);
 167                 } else {
 168                         if (IS_INODE(page) && is_dent_dnode(page)) {
 169                                 err = recover_inode_page(sbi, page);
 170                                 if (err)
 171                                         break;
 172                         }
 173
 174                         /* add this fsync inode to the list */
 175                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
 176                         if (!entry) {
 177                                 err = -ENOMEM;
 178                                 break;
 179                         }
 180
 181                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 182                         if (IS_ERR(entry->inode)) {
 183                                 err = PTR_ERR(entry->inode);
 184                                 kmem_cache_free(fsync_entry_slab, entry);
 185                                 break;
 186                         }
 187                         list_add_tail(&entry->list, head);
 188                 }
 189                 entry->blkaddr = blkaddr;
 190
 191                 err = recover_inode(entry->inode, page);
 192                 if (err && err != -ENOENT)
 193                         break;
 194 next:
 195                 /* check next segment */
 196                 blkaddr = next_blkaddr_of_node(page);
 197         }
 198
 199         unlock_page(page);
 200         __free_pages(page, 0);
 201
 202         return err;
 203 }
 204
 205 static void destroy_fsync_dnodes(struct list_head *head)
 206 {
 207         struct fsync_inode_entry *entry, *tmp;
 208
 209         list_for_each_entry_safe(entry, tmp, head, list) {
 210                 iput(entry->inode);
 211                 list_del(&entry->list);
 212                 kmem_cache_free(fsync_entry_slab, entry);
 213         }
 214 }
 215
 216 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 217                         block_t blkaddr, struct dnode_of_data *dn)
 218 {
 219         struct seg_entry *sentry;
 220         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 221         unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
 222                                         (sbi->blocks_per_seg - 1);
 223         struct f2fs_summary sum;
 224         nid_t ino, nid;
 225         void *kaddr;
 226         struct inode *inode;
 227         struct page *node_page;
 228         unsigned int offset;
 229         block_t bidx;
 230         int i;
 231
 232         sentry = get_seg_entry(sbi, segno);
 233         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 234                 return 0;
 235
 236         /* Get the previous summary */
 237         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 238                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 239                 if (curseg->segno == segno) {
 240                         sum = curseg->sum_blk->entries[blkoff];
 241                         break;
 242                 }
 243         }
 244         if (i > CURSEG_COLD_DATA) {
 245                 struct page *sum_page = get_sum_page(sbi, segno);
 246                 struct f2fs_summary_block *sum_node;
 247                 kaddr = page_address(sum_page);
 248                 sum_node = (struct f2fs_summary_block *)kaddr;
 249                 sum = sum_node->entries[blkoff];
 250                 f2fs_put_page(sum_page, 1);
 251         }
 252
 253         /* Use the locked dnode page and inode */
 254         nid = le32_to_cpu(sum.nid);
 255         if (dn->inode->i_ino == nid) {
 256                 struct dnode_of_data tdn = *dn;
 257                 tdn.nid = nid;
 258                 tdn.node_page = dn->inode_page;
 259                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 260                 truncate_data_blocks_range(&tdn, 1);
 261                 return 0;
 262         } else if (dn->nid == nid) {
 263                 struct dnode_of_data tdn = *dn;
 264                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 265                 truncate_data_blocks_range(&tdn, 1);
 266                 return 0;
 267         }
 268
 269         /* Get the node page */
 270         node_page = get_node_page(sbi, nid);
 271         if (IS_ERR(node_page))
 272                 return PTR_ERR(node_page);
 273
 274         offset = ofs_of_node(node_page);
 275         ino = ino_of_node(node_page);
 276         f2fs_put_page(node_page, 1);
 277
 278         /* Deallocate previous index in the node page */
 279         inode = f2fs_iget(sbi->sb, ino);
 280         if (IS_ERR(inode))
 281                 return PTR_ERR(inode);
 282
 283         bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
 284                                         le16_to_cpu(sum.ofs_in_node);
 285
 286         truncate_hole(inode, bidx, bidx + 1);
 287         iput(inode);
 288         return 0;
 289 }
 290
 291 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 292                                         struct page *page, block_t blkaddr)
 293 {
 294         struct f2fs_inode_info *fi = F2FS_I(inode);
 295         unsigned int start, end;
 296         struct dnode_of_data dn;
 297         struct f2fs_summary sum;
 298         struct node_info ni;
 299         int err = 0, recovered = 0;
 300
 301         if (recover_inline_data(inode, page))
 302                 goto out;
 303
 304         start = start_bidx_of_node(ofs_of_node(page), fi);
 305         if (IS_INODE(page))
 306                 end = start + ADDRS_PER_INODE(fi);
 307         else
 308                 end = start + ADDRS_PER_BLOCK;
 309
 310         f2fs_lock_op(sbi);
 311
 312         set_new_dnode(&dn, inode, NULL, NULL, 0);
 313
 314         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 315         if (err) {
 316                 f2fs_unlock_op(sbi);
 317                 goto out;
 318         }
 319
 320         wait_on_page_writeback(dn.node_page);
 321
 322         get_node_info(sbi, dn.nid, &ni);
 323         f2fs_bug_on(ni.ino != ino_of_node(page));
 324         f2fs_bug_on(ofs_of_node(dn.node_page) != ofs_of_node(page));
 325
 326         for (; start < end; start++) {
 327                 block_t src, dest;
 328
 329                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 330                 dest = datablock_addr(page, dn.ofs_in_node);
 331
 332                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 333                         if (src == NULL_ADDR) {
 334                                 err = reserve_new_block(&dn);
 335                                 /* We should not get -ENOSPC */
 336                                 f2fs_bug_on(err);
 337                         }
 338
 339                         /* Check the previous node page having this index */
 340                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 341                         if (err)
 342                                 goto err;
 343
 344                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 345
 346                         /* write dummy data page */
 347                         recover_data_page(sbi, NULL, &sum, src, dest);
 348                         update_extent_cache(dest, &dn);
 349                         recovered++;
 350                 }
 351                 dn.ofs_in_node++;
 352         }
 353
 354         /* write node page in place */
 355         set_summary(&sum, dn.nid, 0, 0);
 356         if (IS_INODE(dn.node_page))
 357                 sync_inode_page(&dn);
 358
 359         copy_node_footer(dn.node_page, page);
 360         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 361                                         ofs_of_node(page), false);
 362         set_page_dirty(dn.node_page);
 363
 364         recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
 365 err:
 366         f2fs_put_dnode(&dn);
 367         f2fs_unlock_op(sbi);
 368 out:
 369         f2fs_msg(sbi->sb, KERN_NOTICE,
 370                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 371                 inode->i_ino, recovered, err);
 372         return err;
 373 }
 374
 375 static int recover_data(struct f2fs_sb_info *sbi,
 376                                 struct list_head *head, int type)
 377 {
 378         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 379         struct curseg_info *curseg;
 380         struct page *page;
 381         int err = 0;
 382         block_t blkaddr;
 383
 384         /* get node pages in the current segment */
 385         curseg = CURSEG_I(sbi, type);
 386         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 387
 388         /* read node page */
 389         page = alloc_page(GFP_F2FS_ZERO);
 390         if (!page)
 391                 return -ENOMEM;
 392
 393         lock_page(page);
 394
 395         while (1) {
 396                 struct fsync_inode_entry *entry;
 397
 398                 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC);
 399                 if (err)
 400                         return err;
 401
 402                 lock_page(page);
 403
 404                 if (cp_ver != cpver_of_node(page))
 405                         break;
 406
 407                 entry = get_fsync_inode(head, ino_of_node(page));
 408                 if (!entry)
 409                         goto next;
 410
 411                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 412                 if (err)
 413                         break;
 414
 415                 if (entry->blkaddr == blkaddr) {
 416                         iput(entry->inode);
 417                         list_del(&entry->list);
 418                         kmem_cache_free(fsync_entry_slab, entry);
 419                 }
 420 next:
 421                 /* check next segment */
 422                 blkaddr = next_blkaddr_of_node(page);
 423         }
 424
 425         unlock_page(page);
 426         __free_pages(page, 0);
 427
 428         if (!err)
 429                 allocate_new_segments(sbi);
 430         return err;
 431 }
 432
 433 int recover_fsync_data(struct f2fs_sb_info *sbi)
 434 {
 435         struct list_head inode_list;
 436         int err;
 437         bool need_writecp = false;
 438
 439         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 440                         sizeof(struct fsync_inode_entry), NULL);
 441         if (!fsync_entry_slab)
 442                 return -ENOMEM;
 443
 444         INIT_LIST_HEAD(&inode_list);
 445
 446         /* step #1: find fsynced inode numbers */
 447         sbi->por_doing = true;
 448         err = find_fsync_dnodes(sbi, &inode_list);
 449         if (err)
 450                 goto out;
 451
 452         if (list_empty(&inode_list))
 453                 goto out;
 454
 455         need_writecp = true;
 456
 457         /* step #2: recover data */
 458         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 459         f2fs_bug_on(!list_empty(&inode_list));
 460 out:
 461         destroy_fsync_dnodes(&inode_list);
 462         kmem_cache_destroy(fsync_entry_slab);
 463         sbi->por_doing = false;
 464         if (!err && need_writecp)
 465                 write_checkpoint(sbi, false);
 466         return err;
 467 }