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