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 dentry dent, parent;
  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 = -EINVAL;
  57                 goto out;
  58         }
  59
  60         parent.d_inode = dir;
  61         dent.d_parent = &parent;
  62         dent.d_name.len = le32_to_cpu(raw_inode->i_namelen);
  63         dent.d_name.name = raw_inode->i_name;
  64
  65         de = f2fs_find_entry(dir, &dent.d_name, &page);
  66         if (de) {
  67                 kunmap(page);
  68                 f2fs_put_page(page, 0);
  69         } else {
  70                 f2fs_add_link(&dent, inode);
  71         }
  72         iput(dir);
  73 out:
  74         kunmap(ipage);
  75         return err;
  76 }
  77
  78 static int recover_inode(struct inode *inode, struct page *node_page)
  79 {
  80         void *kaddr = page_address(node_page);
  81         struct f2fs_node *raw_node = (struct f2fs_node *)kaddr;
  82         struct f2fs_inode *raw_inode = &(raw_node->i);
  83
  84         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
  85         i_size_write(inode, le64_to_cpu(raw_inode->i_size));
  86         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
  87         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
  88         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
  89         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
  90         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
  91         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
  92
  93         return recover_dentry(node_page, inode);
  94 }
  95
  96 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
  97 {
  98         unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
  99         struct curseg_info *curseg;
 100         struct page *page;
 101         block_t blkaddr;
 102         int err = 0;
 103
 104         /* get node pages in the current segment */
 105         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 106         blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
 107
 108         /* read node page */
 109         page = alloc_page(GFP_F2FS_ZERO);
 110         if (IS_ERR(page))
 111                 return PTR_ERR(page);
 112         lock_page(page);
 113
 114         while (1) {
 115                 struct fsync_inode_entry *entry;
 116
 117                 if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC))
 118                         goto out;
 119
 120                 if (cp_ver != cpver_of_node(page))
 121                         goto out;
 122
 123                 if (!is_fsync_dnode(page))
 124                         goto next;
 125
 126                 entry = get_fsync_inode(head, ino_of_node(page));
 127                 if (entry) {
 128                         entry->blkaddr = blkaddr;
 129                         if (IS_INODE(page) && is_dent_dnode(page))
 130                                 set_inode_flag(F2FS_I(entry->inode),
 131                                                         FI_INC_LINK);
 132                 } else {
 133                         if (IS_INODE(page) && is_dent_dnode(page)) {
 134                                 if (recover_inode_page(sbi, page)) {
 135                                         err = -ENOMEM;
 136                                         goto out;
 137                                 }
 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 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 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)
 160                                 goto out;
 161                 }
 162 next:
 163                 /* check next segment */
 164                 blkaddr = next_blkaddr_of_node(page);
 165                 ClearPageUptodate(page);
 166         }
 167 out:
 168         unlock_page(page);
 169         __free_pages(page, 0);
 170         return err;
 171 }
 172
 173 static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
 174                                         struct list_head *head)
 175 {
 176         struct list_head *this;
 177         struct fsync_inode_entry *entry;
 178         list_for_each(this, head) {
 179                 entry = list_entry(this, struct fsync_inode_entry, list);
 180                 iput(entry->inode);
 181                 list_del(&entry->list);
 182                 kmem_cache_free(fsync_entry_slab, entry);
 183         }
 184 }
 185
 186 static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 187                                                 block_t blkaddr)
 188 {
 189         struct seg_entry *sentry;
 190         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 191         unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
 192                                         (sbi->blocks_per_seg - 1);
 193         struct f2fs_summary sum;
 194         nid_t ino;
 195         void *kaddr;
 196         struct inode *inode;
 197         struct page *node_page;
 198         block_t bidx;
 199         int i;
 200
 201         sentry = get_seg_entry(sbi, segno);
 202         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 203                 return;
 204
 205         /* Get the previous summary */
 206         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 207                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 208                 if (curseg->segno == segno) {
 209                         sum = curseg->sum_blk->entries[blkoff];
 210                         break;
 211                 }
 212         }
 213         if (i > CURSEG_COLD_DATA) {
 214                 struct page *sum_page = get_sum_page(sbi, segno);
 215                 struct f2fs_summary_block *sum_node;
 216                 kaddr = page_address(sum_page);
 217                 sum_node = (struct f2fs_summary_block *)kaddr;
 218                 sum = sum_node->entries[blkoff];
 219                 f2fs_put_page(sum_page, 1);
 220         }
 221
 222         /* Get the node page */
 223         node_page = get_node_page(sbi, le32_to_cpu(sum.nid));
 224         bidx = start_bidx_of_node(ofs_of_node(node_page)) +
 225                                 le16_to_cpu(sum.ofs_in_node);
 226         ino = ino_of_node(node_page);
 227         f2fs_put_page(node_page, 1);
 228
 229         /* Deallocate previous index in the node page */
 230         inode = f2fs_iget_nowait(sbi->sb, ino);
 231         if (IS_ERR(inode))
 232                 return;
 233
 234         truncate_hole(inode, bidx, bidx + 1);
 235         iput(inode);
 236 }
 237
 238 static void do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 239                                         struct page *page, block_t blkaddr)
 240 {
 241         unsigned int start, end;
 242         struct dnode_of_data dn;
 243         struct f2fs_summary sum;
 244         struct node_info ni;
 245
 246         start = start_bidx_of_node(ofs_of_node(page));
 247         if (IS_INODE(page))
 248                 end = start + ADDRS_PER_INODE;
 249         else
 250                 end = start + ADDRS_PER_BLOCK;
 251
 252         set_new_dnode(&dn, inode, NULL, NULL, 0);
 253         if (get_dnode_of_data(&dn, start, 0))
 254                 return;
 255
 256         wait_on_page_writeback(dn.node_page);
 257
 258         get_node_info(sbi, dn.nid, &ni);
 259         BUG_ON(ni.ino != ino_of_node(page));
 260         BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));
 261
 262         for (; start < end; start++) {
 263                 block_t src, dest;
 264
 265                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 266                 dest = datablock_addr(page, dn.ofs_in_node);
 267
 268                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 269                         if (src == NULL_ADDR) {
 270                                 int err = reserve_new_block(&dn);
 271                                 /* We should not get -ENOSPC */
 272                                 BUG_ON(err);
 273                         }
 274
 275                         /* Check the previous node page having this index */
 276                         check_index_in_prev_nodes(sbi, dest);
 277
 278                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 279
 280                         /* write dummy data page */
 281                         recover_data_page(sbi, NULL, &sum, src, dest);
 282                         update_extent_cache(dest, &dn);
 283                 }
 284                 dn.ofs_in_node++;
 285         }
 286
 287         /* write node page in place */
 288         set_summary(&sum, dn.nid, 0, 0);
 289         if (IS_INODE(dn.node_page))
 290                 sync_inode_page(&dn);
 291
 292         copy_node_footer(dn.node_page, page);
 293         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 294                                         ofs_of_node(page), false);
 295         set_page_dirty(dn.node_page);
 296
 297         recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
 298         f2fs_put_dnode(&dn);
 299 }
 300
 301 static void recover_data(struct f2fs_sb_info *sbi,
 302                                 struct list_head *head, int type)
 303 {
 304         unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
 305         struct curseg_info *curseg;
 306         struct page *page;
 307         block_t blkaddr;
 308
 309         /* get node pages in the current segment */
 310         curseg = CURSEG_I(sbi, type);
 311         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 312
 313         /* read node page */
 314         page = alloc_page(GFP_NOFS | __GFP_ZERO);
 315         if (IS_ERR(page))
 316                 return;
 317         lock_page(page);
 318
 319         while (1) {
 320                 struct fsync_inode_entry *entry;
 321
 322                 if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC))
 323                         goto out;
 324
 325                 if (cp_ver != cpver_of_node(page))
 326                         goto out;
 327
 328                 entry = get_fsync_inode(head, ino_of_node(page));
 329                 if (!entry)
 330                         goto next;
 331
 332                 do_recover_data(sbi, entry->inode, page, blkaddr);
 333
 334                 if (entry->blkaddr == blkaddr) {
 335                         iput(entry->inode);
 336                         list_del(&entry->list);
 337                         kmem_cache_free(fsync_entry_slab, entry);
 338                 }
 339 next:
 340                 /* check next segment */
 341                 blkaddr = next_blkaddr_of_node(page);
 342                 ClearPageUptodate(page);
 343         }
 344 out:
 345         unlock_page(page);
 346         __free_pages(page, 0);
 347
 348         allocate_new_segments(sbi);
 349 }
 350
 351 void recover_fsync_data(struct f2fs_sb_info *sbi)
 352 {
 353         struct list_head inode_list;
 354
 355         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 356                         sizeof(struct fsync_inode_entry), NULL);
 357         if (unlikely(!fsync_entry_slab))
 358                 return;
 359
 360         INIT_LIST_HEAD(&inode_list);
 361
 362         /* step #1: find fsynced inode numbers */
 363         if (find_fsync_dnodes(sbi, &inode_list))
 364                 goto out;
 365
 366         if (list_empty(&inode_list))
 367                 goto out;
 368
 369         /* step #2: recover data */
 370         sbi->por_doing = 1;
 371         recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 372         sbi->por_doing = 0;
 373         BUG_ON(!list_empty(&inode_list));
 374 out:
 375         destroy_fsync_dnodes(sbi, &inode_list);
 376         kmem_cache_destroy(fsync_entry_slab);
 377         write_checkpoint(sbi, false, false);
 378 }