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