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