fs/f2fs/inode.c

   1 /*
   2  * fs/f2fs/inode.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 <linux/buffer_head.h>
  14 #include <linux/backing-dev.h>
  15 #include <linux/writeback.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19
  20 #include <trace/events/f2fs.h>
  21
  22 void f2fs_mark_inode_dirty_sync(struct inode *inode)
  23 {
  24         if (f2fs_inode_dirtied(inode))
  25                 return;
  26         mark_inode_dirty_sync(inode);
  27 }
  28
  29 void f2fs_set_inode_flags(struct inode *inode)
  30 {
  31         unsigned int flags = F2FS_I(inode)->i_flags;
  32         unsigned int new_fl = 0;
  33
  34         if (flags & FS_SYNC_FL)
  35                 new_fl |= S_SYNC;
  36         if (flags & FS_APPEND_FL)
  37                 new_fl |= S_APPEND;
  38         if (flags & FS_IMMUTABLE_FL)
  39                 new_fl |= S_IMMUTABLE;
  40         if (flags & FS_NOATIME_FL)
  41                 new_fl |= S_NOATIME;
  42         if (flags & FS_DIRSYNC_FL)
  43                 new_fl |= S_DIRSYNC;
  44         inode_set_flags(inode, new_fl,
  45                         S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
  46         f2fs_mark_inode_dirty_sync(inode);
  47 }
  48
  49 static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  50 {
  51         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
  52                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
  53                 if (ri->i_addr[0])
  54                         inode->i_rdev =
  55                                 old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  56                 else
  57                         inode->i_rdev =
  58                                 new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  59         }
  60 }
  61
  62 static bool __written_first_block(struct f2fs_inode *ri)
  63 {
  64         block_t addr = le32_to_cpu(ri->i_addr[0]);
  65
  66         if (addr != NEW_ADDR && addr != NULL_ADDR)
  67                 return true;
  68         return false;
  69 }
  70
  71 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  72 {
  73         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  74                 if (old_valid_dev(inode->i_rdev)) {
  75                         ri->i_addr[0] =
  76                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
  77                         ri->i_addr[1] = 0;
  78                 } else {
  79                         ri->i_addr[0] = 0;
  80                         ri->i_addr[1] =
  81                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
  82                         ri->i_addr[2] = 0;
  83                 }
  84         }
  85 }
  86
  87 static void __recover_inline_status(struct inode *inode, struct page *ipage)
  88 {
  89         void *inline_data = inline_data_addr(ipage);
  90         __le32 *start = inline_data;
  91         __le32 *end = start + MAX_INLINE_DATA / sizeof(__le32);
  92
  93         while (start < end) {
  94                 if (*start++) {
  95                         f2fs_wait_on_page_writeback(ipage, NODE, true);
  96
  97                         set_inode_flag(inode, FI_DATA_EXIST);
  98                         set_raw_inline(inode, F2FS_INODE(ipage));
  99                         set_page_dirty(ipage);
 100                         return;
 101                 }
 102         }
 103         return;
 104 }
 105
 106 static int do_read_inode(struct inode *inode)
 107 {
 108         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 109         struct f2fs_inode_info *fi = F2FS_I(inode);
 110         struct page *node_page;
 111         struct f2fs_inode *ri;
 112
 113         /* Check if ino is within scope */
 114         if (check_nid_range(sbi, inode->i_ino)) {
 115                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
 116                          (unsigned long) inode->i_ino);
 117                 WARN_ON(1);
 118                 return -EINVAL;
 119         }
 120
 121         node_page = get_node_page(sbi, inode->i_ino);
 122         if (IS_ERR(node_page))
 123                 return PTR_ERR(node_page);
 124
 125         ri = F2FS_INODE(node_page);
 126
 127         inode->i_mode = le16_to_cpu(ri->i_mode);
 128         i_uid_write(inode, le32_to_cpu(ri->i_uid));
 129         i_gid_write(inode, le32_to_cpu(ri->i_gid));
 130         set_nlink(inode, le32_to_cpu(ri->i_links));
 131         inode->i_size = le64_to_cpu(ri->i_size);
 132         inode->i_blocks = le64_to_cpu(ri->i_blocks);
 133
 134         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
 135         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 136         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 137         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 138         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 139         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 140         inode->i_generation = le32_to_cpu(ri->i_generation);
 141
 142         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 143         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 144         fi->i_flags = le32_to_cpu(ri->i_flags);
 145         fi->flags = 0;
 146         fi->i_advise = ri->i_advise;
 147         fi->i_pino = le32_to_cpu(ri->i_pino);
 148         fi->i_dir_level = ri->i_dir_level;
 149
 150         if (f2fs_init_extent_tree(inode, &ri->i_ext))
 151                 set_page_dirty(node_page);
 152
 153         get_inline_info(inode, ri);
 154
 155         /* check data exist */
 156         if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 157                 __recover_inline_status(inode, node_page);
 158
 159         /* get rdev by using inline_info */
 160         __get_inode_rdev(inode, ri);
 161
 162         if (__written_first_block(ri))
 163                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
 164
 165         if (!need_inode_block_update(sbi, inode->i_ino))
 166                 fi->last_disk_size = inode->i_size;
 167
 168         f2fs_put_page(node_page, 1);
 169
 170         stat_inc_inline_xattr(inode);
 171         stat_inc_inline_inode(inode);
 172         stat_inc_inline_dir(inode);
 173
 174         return 0;
 175 }
 176
 177 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 178 {
 179         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 180         struct inode *inode;
 181         int ret = 0;
 182
 183         inode = iget_locked(sb, ino);
 184         if (!inode)
 185                 return ERR_PTR(-ENOMEM);
 186
 187         if (!(inode->i_state & I_NEW)) {
 188                 trace_f2fs_iget(inode);
 189                 return inode;
 190         }
 191         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 192                 goto make_now;
 193
 194         ret = do_read_inode(inode);
 195         if (ret)
 196                 goto bad_inode;
 197 make_now:
 198         if (ino == F2FS_NODE_INO(sbi)) {
 199                 inode->i_mapping->a_ops = &f2fs_node_aops;
 200                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 201         } else if (ino == F2FS_META_INO(sbi)) {
 202                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 203                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 204         } else if (S_ISREG(inode->i_mode)) {
 205                 inode->i_op = &f2fs_file_inode_operations;
 206                 inode->i_fop = &f2fs_file_operations;
 207                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 208         } else if (S_ISDIR(inode->i_mode)) {
 209                 inode->i_op = &f2fs_dir_inode_operations;
 210                 inode->i_fop = &f2fs_dir_operations;
 211                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 212                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 213         } else if (S_ISLNK(inode->i_mode)) {
 214                 if (f2fs_encrypted_inode(inode))
 215                         inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 216                 else
 217                         inode->i_op = &f2fs_symlink_inode_operations;
 218                 inode_nohighmem(inode);
 219                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 220         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 221                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 222                 inode->i_op = &f2fs_special_inode_operations;
 223                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 224         } else {
 225                 ret = -EIO;
 226                 goto bad_inode;
 227         }
 228         unlock_new_inode(inode);
 229         trace_f2fs_iget(inode);
 230         return inode;
 231
 232 bad_inode:
 233         iget_failed(inode);
 234         trace_f2fs_iget_exit(inode, ret);
 235         return ERR_PTR(ret);
 236 }
 237
 238 struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino)
 239 {
 240         struct inode *inode;
 241 retry:
 242         inode = f2fs_iget(sb, ino);
 243         if (IS_ERR(inode)) {
 244                 if (PTR_ERR(inode) == -ENOMEM) {
 245                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 246                         goto retry;
 247                 }
 248         }
 249         return inode;
 250 }
 251
 252 int update_inode(struct inode *inode, struct page *node_page)
 253 {
 254         struct f2fs_inode *ri;
 255
 256         f2fs_inode_synced(inode);
 257
 258         f2fs_wait_on_page_writeback(node_page, NODE, true);
 259
 260         ri = F2FS_INODE(node_page);
 261
 262         ri->i_mode = cpu_to_le16(inode->i_mode);
 263         ri->i_advise = F2FS_I(inode)->i_advise;
 264         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 265         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 266         ri->i_links = cpu_to_le32(inode->i_nlink);
 267         ri->i_size = cpu_to_le64(i_size_read(inode));
 268         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 269
 270         if (F2FS_I(inode)->extent_tree)
 271                 set_raw_extent(&F2FS_I(inode)->extent_tree->largest,
 272                                                         &ri->i_ext);
 273         else
 274                 memset(&ri->i_ext, 0, sizeof(ri->i_ext));
 275         set_raw_inline(inode, ri);
 276
 277         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 278         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 279         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 280         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 281         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 282         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 283         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 284         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 285         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 286         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 287         ri->i_generation = cpu_to_le32(inode->i_generation);
 288         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 289
 290         __set_inode_rdev(inode, ri);
 291         set_cold_node(inode, node_page);
 292
 293         /* deleted inode */
 294         if (inode->i_nlink == 0)
 295                 clear_inline_node(node_page);
 296
 297         return set_page_dirty(node_page);
 298 }
 299
 300 int update_inode_page(struct inode *inode)
 301 {
 302         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 303         struct page *node_page;
 304         int ret = 0;
 305 retry:
 306         node_page = get_node_page(sbi, inode->i_ino);
 307         if (IS_ERR(node_page)) {
 308                 int err = PTR_ERR(node_page);
 309                 if (err == -ENOMEM) {
 310                         cond_resched();
 311                         goto retry;
 312                 } else if (err != -ENOENT) {
 313                         f2fs_stop_checkpoint(sbi, false);
 314                 }
 315                 f2fs_inode_synced(inode);
 316                 return 0;
 317         }
 318         ret = update_inode(inode, node_page);
 319         f2fs_put_page(node_page, 1);
 320         return ret;
 321 }
 322
 323 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 324 {
 325         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 326
 327         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 328                         inode->i_ino == F2FS_META_INO(sbi))
 329                 return 0;
 330
 331         if (!is_inode_flag_set(inode, FI_DIRTY_INODE))
 332                 return 0;
 333
 334         /*
 335          * We need to balance fs here to prevent from producing dirty node pages
 336          * during the urgent cleaning time when runing out of free sections.
 337          */
 338         if (update_inode_page(inode))
 339                 f2fs_balance_fs(sbi, true);
 340         return 0;
 341 }
 342
 343 /*
 344  * Called at the last iput() if i_nlink is zero
 345  */
 346 void f2fs_evict_inode(struct inode *inode)
 347 {
 348         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 349         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
 350         int err = 0;
 351
 352         /* some remained atomic pages should discarded */
 353         if (f2fs_is_atomic_file(inode))
 354                 drop_inmem_pages(inode);
 355
 356         trace_f2fs_evict_inode(inode);
 357         truncate_inode_pages_final(&inode->i_data);
 358
 359         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 360                         inode->i_ino == F2FS_META_INO(sbi))
 361                 goto out_clear;
 362
 363         f2fs_bug_on(sbi, get_dirty_pages(inode));
 364         remove_dirty_inode(inode);
 365
 366         f2fs_destroy_extent_tree(inode);
 367
 368         if (inode->i_nlink || is_bad_inode(inode))
 369                 goto no_delete;
 370
 371 #ifdef CONFIG_F2FS_FAULT_INJECTION
 372         if (time_to_inject(sbi, FAULT_EVICT_INODE))
 373                 goto no_delete;
 374 #endif
 375
 376         sb_start_intwrite(inode->i_sb);
 377         set_inode_flag(inode, FI_NO_ALLOC);
 378         i_size_write(inode, 0);
 379 retry:
 380         if (F2FS_HAS_BLOCKS(inode))
 381                 err = f2fs_truncate(inode);
 382
 383         if (!err) {
 384                 f2fs_lock_op(sbi);
 385                 err = remove_inode_page(inode);
 386                 f2fs_unlock_op(sbi);
 387         }
 388
 389         /* give more chances, if ENOMEM case */
 390         if (err == -ENOMEM) {
 391                 err = 0;
 392                 goto retry;
 393         }
 394
 395         if (err)
 396                 update_inode_page(inode);
 397         sb_end_intwrite(inode->i_sb);
 398 no_delete:
 399         stat_dec_inline_xattr(inode);
 400         stat_dec_inline_dir(inode);
 401         stat_dec_inline_inode(inode);
 402
 403         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 404         if (xnid)
 405                 invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
 406         if (is_inode_flag_set(inode, FI_APPEND_WRITE))
 407                 add_ino_entry(sbi, inode->i_ino, APPEND_INO);
 408         if (is_inode_flag_set(inode, FI_UPDATE_WRITE))
 409                 add_ino_entry(sbi, inode->i_ino, UPDATE_INO);
 410         if (is_inode_flag_set(inode, FI_FREE_NID)) {
 411                 alloc_nid_failed(sbi, inode->i_ino);
 412                 clear_inode_flag(inode, FI_FREE_NID);
 413         }
 414         f2fs_bug_on(sbi, err &&
 415                 !exist_written_data(sbi, inode->i_ino, ORPHAN_INO));
 416 out_clear:
 417         fscrypt_put_encryption_info(inode, NULL);
 418         clear_inode(inode);
 419 }
 420
 421 /* caller should call f2fs_lock_op() */
 422 void handle_failed_inode(struct inode *inode)
 423 {
 424         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 425         struct node_info ni;
 426
 427         /* don't make bad inode, since it becomes a regular file. */
 428         unlock_new_inode(inode);
 429
 430         /*
 431          * Note: we should add inode to orphan list before f2fs_unlock_op()
 432          * so we can prevent losing this orphan when encoutering checkpoint
 433          * and following suddenly power-off.
 434          */
 435         get_node_info(sbi, inode->i_ino, &ni);
 436
 437         if (ni.blk_addr != NULL_ADDR) {
 438                 int err = acquire_orphan_inode(sbi);
 439                 if (err) {
 440                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 441                         f2fs_msg(sbi->sb, KERN_WARNING,
 442                                 "Too many orphan inodes, run fsck to fix.");
 443                 } else {
 444                         add_orphan_inode(inode);
 445                 }
 446                 alloc_nid_done(sbi, inode->i_ino);
 447         } else {
 448                 set_inode_flag(inode, FI_FREE_NID);
 449         }
 450
 451         f2fs_unlock_op(sbi);
 452
 453         /* iput will drop the inode object */
 454         iput(inode);
 455 }