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 = f2fs_iget(inode->i_sb, pino); 50 if (IS_ERR(dir)) { 51 err = PTR_ERR(dir); 52 goto out; 53 } 54 55 name.len = le32_to_cpu(raw_inode->i_namelen); 56 name.name = raw_inode->i_name; 57 58 if (unlikely(name.len > F2FS_NAME_LEN)) { 59 WARN_ON(1); 60 err = -ENAMETOOLONG; 61 goto out_err; 62 } 63 retry: 64 de = f2fs_find_entry(dir, &name, &page); 65 if (de && inode->i_ino == le32_to_cpu(de->ino)) { 66 clear_inode_flag(F2FS_I(inode), FI_INC_LINK); 67 goto out_unmap_put; 68 } 69 if (de) { 70 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino)); 71 if (IS_ERR(einode)) { 72 WARN_ON(1); 73 err = PTR_ERR(einode); 74 if (err == -ENOENT) 75 err = -EEXIST; 76 goto out_unmap_put; 77 } 78 err = acquire_orphan_inode(F2FS_SB(inode->i_sb)); 79 if (err) { 80 iput(einode); 81 goto out_unmap_put; 82 } 83 f2fs_delete_entry(de, page, einode); 84 iput(einode); 85 goto retry; 86 } 87 err = __f2fs_add_link(dir, &name, inode); 88 if (err) 89 goto out_err; 90 91 if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) { 92 iput(dir); 93 } else { 94 add_dirty_dir_inode(dir); 95 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT); 96 } 97 98 goto out; 99 100 out_unmap_put: 101 kunmap(page); 102 f2fs_put_page(page, 0); 103 out_err: 104 iput(dir); 105 out: 106 f2fs_msg(inode->i_sb, KERN_NOTICE, 107 "%s: ino = %x, name = %s, dir = %lx, err = %d", 108 __func__, ino_of_node(ipage), raw_inode->i_name, 109 IS_ERR(dir) ? 0 : dir->i_ino, err); 110 return err; 111 } 112 113 static int recover_inode(struct inode *inode, struct page *node_page) 114 { 115 struct f2fs_inode *raw_inode = F2FS_INODE(node_page); 116 117 if (!IS_INODE(node_page)) 118 return 0; 119 120 inode->i_mode = le16_to_cpu(raw_inode->i_mode); 121 i_size_write(inode, le64_to_cpu(raw_inode->i_size)); 122 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); 123 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); 124 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); 125 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); 126 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); 127 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); 128 129 if (is_dent_dnode(node_page)) 130 return recover_dentry(node_page, inode); 131 132 f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s", 133 ino_of_node(node_page), raw_inode->i_name); 134 return 0; 135 } 136 137 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head) 138 { 139 unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi)); 140 struct curseg_info *curseg; 141 struct page *page; 142 block_t blkaddr; 143 int err = 0; 144 145 /* get node pages in the current segment */ 146 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); 147 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); 148 149 /* read node page */ 150 page = alloc_page(GFP_F2FS_ZERO); 151 if (!page) 152 return -ENOMEM; 153 lock_page(page); 154 155 while (1) { 156 struct fsync_inode_entry *entry; 157 158 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); 159 if (err) 160 return err; 161 162 lock_page(page); 163 164 if (cp_ver != cpver_of_node(page)) 165 break; 166 167 if (!is_fsync_dnode(page)) 168 goto next; 169 170 entry = get_fsync_inode(head, ino_of_node(page)); 171 if (entry) { 172 if (IS_INODE(page) && is_dent_dnode(page)) 173 set_inode_flag(F2FS_I(entry->inode), 174 FI_INC_LINK); 175 } else { 176 if (IS_INODE(page) && is_dent_dnode(page)) { 177 err = recover_inode_page(sbi, page); 178 if (err) 179 break; 180 } 181 182 /* add this fsync inode to the list */ 183 entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS); 184 if (!entry) { 185 err = -ENOMEM; 186 break; 187 } 188 189 entry->inode = f2fs_iget(sbi->sb, ino_of_node(page)); 190 if (IS_ERR(entry->inode)) { 191 err = PTR_ERR(entry->inode); 192 kmem_cache_free(fsync_entry_slab, entry); 193 break; 194 } 195 list_add_tail(&entry->list, head); 196 } 197 entry->blkaddr = blkaddr; 198 199 err = recover_inode(entry->inode, page); 200 if (err && err != -ENOENT) 201 break; 202 next: 203 /* check next segment */ 204 blkaddr = next_blkaddr_of_node(page); 205 } 206 207 unlock_page(page); 208 __free_pages(page, 0); 209 210 return err; 211 } 212 213 static void destroy_fsync_dnodes(struct list_head *head) 214 { 215 struct fsync_inode_entry *entry, *tmp; 216 217 list_for_each_entry_safe(entry, tmp, head, list) { 218 iput(entry->inode); 219 list_del(&entry->list); 220 kmem_cache_free(fsync_entry_slab, entry); 221 } 222 } 223 224 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi, 225 block_t blkaddr, struct dnode_of_data *dn) 226 { 227 struct seg_entry *sentry; 228 unsigned int segno = GET_SEGNO(sbi, blkaddr); 229 unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); 230 struct f2fs_summary_block *sum_node; 231 struct f2fs_summary sum; 232 struct page *sum_page, *node_page; 233 nid_t ino, nid; 234 struct inode *inode; 235 unsigned int offset; 236 block_t bidx; 237 int i; 238 239 sentry = get_seg_entry(sbi, segno); 240 if (!f2fs_test_bit(blkoff, sentry->cur_valid_map)) 241 return 0; 242 243 /* Get the previous summary */ 244 for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) { 245 struct curseg_info *curseg = CURSEG_I(sbi, i); 246 if (curseg->segno == segno) { 247 sum = curseg->sum_blk->entries[blkoff]; 248 goto got_it; 249 } 250 } 251 252 sum_page = get_sum_page(sbi, segno); 253 sum_node = (struct f2fs_summary_block *)page_address(sum_page); 254 sum = sum_node->entries[blkoff]; 255 f2fs_put_page(sum_page, 1); 256 got_it: 257 /* Use the locked dnode page and inode */ 258 nid = le32_to_cpu(sum.nid); 259 if (dn->inode->i_ino == nid) { 260 struct dnode_of_data tdn = *dn; 261 tdn.nid = nid; 262 tdn.node_page = dn->inode_page; 263 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); 264 truncate_data_blocks_range(&tdn, 1); 265 return 0; 266 } else if (dn->nid == nid) { 267 struct dnode_of_data tdn = *dn; 268 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); 269 truncate_data_blocks_range(&tdn, 1); 270 return 0; 271 } 272 273 /* Get the node page */ 274 node_page = get_node_page(sbi, nid); 275 if (IS_ERR(node_page)) 276 return PTR_ERR(node_page); 277 278 offset = ofs_of_node(node_page); 279 ino = ino_of_node(node_page); 280 f2fs_put_page(node_page, 1); 281 282 /* Deallocate previous index in the node page */ 283 inode = f2fs_iget(sbi->sb, ino); 284 if (IS_ERR(inode)) 285 return PTR_ERR(inode); 286 287 bidx = start_bidx_of_node(offset, F2FS_I(inode)) + 288 le16_to_cpu(sum.ofs_in_node); 289 290 truncate_hole(inode, bidx, bidx + 1); 291 iput(inode); 292 return 0; 293 } 294 295 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode, 296 struct page *page, block_t blkaddr) 297 { 298 struct f2fs_inode_info *fi = F2FS_I(inode); 299 unsigned int start, end; 300 struct dnode_of_data dn; 301 struct f2fs_summary sum; 302 struct node_info ni; 303 int err = 0, recovered = 0; 304 305 /* step 1: recover xattr */ 306 if (IS_INODE(page)) { 307 recover_inline_xattr(inode, page); 308 } else if (f2fs_has_xattr_block(ofs_of_node(page))) { 309 recover_xattr_data(inode, page, blkaddr); 310 goto out; 311 } 312 313 /* step 2: recover inline data */ 314 if (recover_inline_data(inode, page)) 315 goto out; 316 317 /* step 3: recover data indices */ 318 start = start_bidx_of_node(ofs_of_node(page), fi); 319 end = start + ADDRS_PER_PAGE(page, fi); 320 321 f2fs_lock_op(sbi); 322 323 set_new_dnode(&dn, inode, NULL, NULL, 0); 324 325 err = get_dnode_of_data(&dn, start, ALLOC_NODE); 326 if (err) { 327 f2fs_unlock_op(sbi); 328 goto out; 329 } 330 331 f2fs_wait_on_page_writeback(dn.node_page, NODE); 332 333 get_node_info(sbi, dn.nid, &ni); 334 f2fs_bug_on(ni.ino != ino_of_node(page)); 335 f2fs_bug_on(ofs_of_node(dn.node_page) != ofs_of_node(page)); 336 337 for (; start < end; start++) { 338 block_t src, dest; 339 340 src = datablock_addr(dn.node_page, dn.ofs_in_node); 341 dest = datablock_addr(page, dn.ofs_in_node); 342 343 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) { 344 if (src == NULL_ADDR) { 345 err = reserve_new_block(&dn); 346 /* We should not get -ENOSPC */ 347 f2fs_bug_on(err); 348 } 349 350 /* Check the previous node page having this index */ 351 err = check_index_in_prev_nodes(sbi, dest, &dn); 352 if (err) 353 goto err; 354 355 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version); 356 357 /* write dummy data page */ 358 recover_data_page(sbi, NULL, &sum, src, dest); 359 update_extent_cache(dest, &dn); 360 recovered++; 361 } 362 dn.ofs_in_node++; 363 } 364 365 /* write node page in place */ 366 set_summary(&sum, dn.nid, 0, 0); 367 if (IS_INODE(dn.node_page)) 368 sync_inode_page(&dn); 369 370 copy_node_footer(dn.node_page, page); 371 fill_node_footer(dn.node_page, dn.nid, ni.ino, 372 ofs_of_node(page), false); 373 set_page_dirty(dn.node_page); 374 err: 375 f2fs_put_dnode(&dn); 376 f2fs_unlock_op(sbi); 377 out: 378 f2fs_msg(sbi->sb, KERN_NOTICE, 379 "recover_data: ino = %lx, recovered = %d blocks, err = %d", 380 inode->i_ino, recovered, err); 381 return err; 382 } 383 384 static int recover_data(struct f2fs_sb_info *sbi, 385 struct list_head *head, int type) 386 { 387 unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi)); 388 struct curseg_info *curseg; 389 struct page *page; 390 int err = 0; 391 block_t blkaddr; 392 393 /* get node pages in the current segment */ 394 curseg = CURSEG_I(sbi, type); 395 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); 396 397 /* read node page */ 398 page = alloc_page(GFP_F2FS_ZERO); 399 if (!page) 400 return -ENOMEM; 401 402 lock_page(page); 403 404 while (1) { 405 struct fsync_inode_entry *entry; 406 407 err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); 408 if (err) 409 return err; 410 411 lock_page(page); 412 413 if (cp_ver != cpver_of_node(page)) 414 break; 415 416 entry = get_fsync_inode(head, ino_of_node(page)); 417 if (!entry) 418 goto next; 419 420 err = do_recover_data(sbi, entry->inode, page, blkaddr); 421 if (err) 422 break; 423 424 if (entry->blkaddr == blkaddr) { 425 iput(entry->inode); 426 list_del(&entry->list); 427 kmem_cache_free(fsync_entry_slab, entry); 428 } 429 next: 430 /* check next segment */ 431 blkaddr = next_blkaddr_of_node(page); 432 } 433 434 unlock_page(page); 435 __free_pages(page, 0); 436 437 if (!err) 438 allocate_new_segments(sbi); 439 return err; 440 } 441 442 int recover_fsync_data(struct f2fs_sb_info *sbi) 443 { 444 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); 445 struct list_head inode_list; 446 block_t blkaddr; 447 int err; 448 bool need_writecp = false; 449 450 fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry", 451 sizeof(struct fsync_inode_entry)); 452 if (!fsync_entry_slab) 453 return -ENOMEM; 454 455 INIT_LIST_HEAD(&inode_list); 456 457 /* step #1: find fsynced inode numbers */ 458 sbi->por_doing = true; 459 460 /* prevent checkpoint */ 461 mutex_lock(&sbi->cp_mutex); 462 463 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); 464 465 err = find_fsync_dnodes(sbi, &inode_list); 466 if (err) 467 goto out; 468 469 if (list_empty(&inode_list)) 470 goto out; 471 472 need_writecp = true; 473 474 /* step #2: recover data */ 475 err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE); 476 if (!err) 477 f2fs_bug_on(!list_empty(&inode_list)); 478 out: 479 destroy_fsync_dnodes(&inode_list); 480 kmem_cache_destroy(fsync_entry_slab); 481 482 if (err) { 483 truncate_inode_pages_final(NODE_MAPPING(sbi)); 484 truncate_inode_pages_final(META_MAPPING(sbi)); 485 } 486 487 sbi->por_doing = false; 488 if (err) { 489 discard_next_dnode(sbi, blkaddr); 490 491 /* Flush all the NAT/SIT pages */ 492 while (get_pages(sbi, F2FS_DIRTY_META)) 493 sync_meta_pages(sbi, META, LONG_MAX); 494 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); 495 mutex_unlock(&sbi->cp_mutex); 496 } else if (need_writecp) { 497 mutex_unlock(&sbi->cp_mutex); 498 write_checkpoint(sbi, false); 499 } else { 500 mutex_unlock(&sbi->cp_mutex); 501 } 502 return err; 503 } 504