fs/btrfs/btrfs_inode.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2007 Oracle.  All rights reserved.
   4  */
   5
   6 #ifndef BTRFS_INODE_H
   7 #define BTRFS_INODE_H
   8
   9 #include <linux/hash.h>
  10 #include "extent_map.h"
  11 #include "extent_io.h"
  12 #include "ordered-data.h"
  13 #include "delayed-inode.h"
  14
  15 /*
  16  * ordered_data_close is set by truncate when a file that used
  17  * to have good data has been truncated to zero.  When it is set
  18  * the btrfs file release call will add this inode to the
  19  * ordered operations list so that we make sure to flush out any
  20  * new data the application may have written before commit.
  21  */
  22 enum {
  23         BTRFS_INODE_ORDERED_DATA_CLOSE = 0,
  24         BTRFS_INODE_DUMMY,
  25         BTRFS_INODE_IN_DEFRAG,
  26         BTRFS_INODE_HAS_ASYNC_EXTENT,
  27         BTRFS_INODE_NEEDS_FULL_SYNC,
  28         BTRFS_INODE_COPY_EVERYTHING,
  29         BTRFS_INODE_IN_DELALLOC_LIST,
  30         BTRFS_INODE_READDIO_NEED_LOCK,
  31         BTRFS_INODE_HAS_PROPS,
  32         BTRFS_INODE_SNAPSHOT_FLUSH,
  33 };
  34
  35 /* in memory btrfs inode */
  36 struct btrfs_inode {
  37         /* which subvolume this inode belongs to */
  38         struct btrfs_root *root;
  39
  40         /* key used to find this inode on disk.  This is used by the code
  41          * to read in roots of subvolumes
  42          */
  43         struct btrfs_key location;
  44
  45         /*
  46          * Lock for counters and all fields used to determine if the inode is in
  47          * the log or not (last_trans, last_sub_trans, last_log_commit,
  48          * logged_trans).
  49          */
  50         spinlock_t lock;
  51
  52         /* the extent_tree has caches of all the extent mappings to disk */
  53         struct extent_map_tree extent_tree;
  54
  55         /* the io_tree does range state (DIRTY, LOCKED etc) */
  56         struct extent_io_tree io_tree;
  57
  58         /* special utility tree used to record which mirrors have already been
  59          * tried when checksums fail for a given block
  60          */
  61         struct extent_io_tree io_failure_tree;
  62
  63         /* held while logging the inode in tree-log.c */
  64         struct mutex log_mutex;
  65
  66         /* held while doing delalloc reservations */
  67         struct mutex delalloc_mutex;
  68
  69         /* used to order data wrt metadata */
  70         struct btrfs_ordered_inode_tree ordered_tree;
  71
  72         /* list of all the delalloc inodes in the FS.  There are times we need
  73          * to write all the delalloc pages to disk, and this list is used
  74          * to walk them all.
  75          */
  76         struct list_head delalloc_inodes;
  77
  78         /* node for the red-black tree that links inodes in subvolume root */
  79         struct rb_node rb_node;
  80
  81         unsigned long runtime_flags;
  82
  83         /* Keep track of who's O_SYNC/fsyncing currently */
  84         atomic_t sync_writers;
  85
  86         /* full 64 bit generation number, struct vfs_inode doesn't have a big
  87          * enough field for this.
  88          */
  89         u64 generation;
  90
  91         /*
  92          * transid of the trans_handle that last modified this inode
  93          */
  94         u64 last_trans;
  95
  96         /*
  97          * transid that last logged this inode
  98          */
  99         u64 logged_trans;
 100
 101         /*
 102          * log transid when this inode was last modified
 103          */
 104         int last_sub_trans;
 105
 106         /* a local copy of root's last_log_commit */
 107         int last_log_commit;
 108
 109         /* total number of bytes pending delalloc, used by stat to calc the
 110          * real block usage of the file
 111          */
 112         u64 delalloc_bytes;
 113
 114         /*
 115          * Total number of bytes pending delalloc that fall within a file
 116          * range that is either a hole or beyond EOF (and no prealloc extent
 117          * exists in the range). This is always <= delalloc_bytes.
 118          */
 119         u64 new_delalloc_bytes;
 120
 121         /*
 122          * total number of bytes pending defrag, used by stat to check whether
 123          * it needs COW.
 124          */
 125         u64 defrag_bytes;
 126
 127         /*
 128          * the size of the file stored in the metadata on disk.  data=ordered
 129          * means the in-memory i_size might be larger than the size on disk
 130          * because not all the blocks are written yet.
 131          */
 132         u64 disk_i_size;
 133
 134         /*
 135          * if this is a directory then index_cnt is the counter for the index
 136          * number for new files that are created
 137          */
 138         u64 index_cnt;
 139
 140         /* Cache the directory index number to speed the dir/file remove */
 141         u64 dir_index;
 142
 143         /* the fsync log has some corner cases that mean we have to check
 144          * directories to see if any unlinks have been done before
 145          * the directory was logged.  See tree-log.c for all the
 146          * details
 147          */
 148         u64 last_unlink_trans;
 149
 150         /*
 151          * Track the transaction id of the last transaction used to create a
 152          * hard link for the inode. This is used by the log tree (fsync).
 153          */
 154         u64 last_link_trans;
 155
 156         /*
 157          * Number of bytes outstanding that are going to need csums.  This is
 158          * used in ENOSPC accounting.
 159          */
 160         u64 csum_bytes;
 161
 162         /* flags field from the on disk inode */
 163         u32 flags;
 164
 165         /*
 166          * Counters to keep track of the number of extent item's we may use due
 167          * to delalloc and such.  outstanding_extents is the number of extent
 168          * items we think we'll end up using, and reserved_extents is the number
 169          * of extent items we've reserved metadata for.
 170          */
 171         unsigned outstanding_extents;
 172
 173         struct btrfs_block_rsv block_rsv;
 174
 175         /*
 176          * Cached values of inode properties
 177          */
 178         unsigned prop_compress;         /* per-file compression algorithm */
 179         /*
 180          * Force compression on the file using the defrag ioctl, could be
 181          * different from prop_compress and takes precedence if set
 182          */
 183         unsigned defrag_compress;
 184
 185         struct btrfs_delayed_node *delayed_node;
 186
 187         /* File creation time. */
 188         struct timespec64 i_otime;
 189
 190         /* Hook into fs_info->delayed_iputs */
 191         struct list_head delayed_iput;
 192
 193         /*
 194          * To avoid races between lockless (i_mutex not held) direct IO writes
 195          * and concurrent fsync requests. Direct IO writes must acquire read
 196          * access on this semaphore for creating an extent map and its
 197          * corresponding ordered extent. The fast fsync path must acquire write
 198          * access on this semaphore before it collects ordered extents and
 199          * extent maps.
 200          */
 201         struct rw_semaphore dio_sem;
 202
 203         struct inode vfs_inode;
 204 };
 205
 206 extern unsigned char btrfs_filetype_table[];
 207
 208 static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
 209 {
 210         return container_of(inode, struct btrfs_inode, vfs_inode);
 211 }
 212
 213 static inline unsigned long btrfs_inode_hash(u64 objectid,
 214                                              const struct btrfs_root *root)
 215 {
 216         u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME);
 217
 218 #if BITS_PER_LONG == 32
 219         h = (h >> 32) ^ (h & 0xffffffff);
 220 #endif
 221
 222         return (unsigned long)h;
 223 }
 224
 225 static inline void btrfs_insert_inode_hash(struct inode *inode)
 226 {
 227         unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root);
 228
 229         __insert_inode_hash(inode, h);
 230 }
 231
 232 static inline u64 btrfs_ino(const struct btrfs_inode *inode)
 233 {
 234         u64 ino = inode->location.objectid;
 235
 236         /*
 237          * !ino: btree_inode
 238          * type == BTRFS_ROOT_ITEM_KEY: subvol dir
 239          */
 240         if (!ino || inode->location.type == BTRFS_ROOT_ITEM_KEY)
 241                 ino = inode->vfs_inode.i_ino;
 242         return ino;
 243 }
 244
 245 static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size)
 246 {
 247         i_size_write(&inode->vfs_inode, size);
 248         inode->disk_i_size = size;
 249 }
 250
 251 static inline bool btrfs_is_free_space_inode(struct btrfs_inode *inode)
 252 {
 253         struct btrfs_root *root = inode->root;
 254
 255         if (root == root->fs_info->tree_root &&
 256             btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
 257                 return true;
 258         if (inode->location.objectid == BTRFS_FREE_INO_OBJECTID)
 259                 return true;
 260         return false;
 261 }
 262
 263 static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode,
 264                                                  int mod)
 265 {
 266         lockdep_assert_held(&inode->lock);
 267         inode->outstanding_extents += mod;
 268         if (btrfs_is_free_space_inode(inode))
 269                 return;
 270         trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode),
 271                                                   mod);
 272 }
 273
 274 static inline int btrfs_inode_in_log(struct btrfs_inode *inode, u64 generation)
 275 {
 276         int ret = 0;
 277
 278         spin_lock(&inode->lock);
 279         if (inode->logged_trans == generation &&
 280             inode->last_sub_trans <= inode->last_log_commit &&
 281             inode->last_sub_trans <= inode->root->last_log_commit) {
 282                 /*
 283                  * After a ranged fsync we might have left some extent maps
 284                  * (that fall outside the fsync's range). So return false
 285                  * here if the list isn't empty, to make sure btrfs_log_inode()
 286                  * will be called and process those extent maps.
 287                  */
 288                 smp_mb();
 289                 if (list_empty(&inode->extent_tree.modified_extents))
 290                         ret = 1;
 291         }
 292         spin_unlock(&inode->lock);
 293         return ret;
 294 }
 295
 296 #define BTRFS_DIO_ORIG_BIO_SUBMITTED    0x1
 297
 298 struct btrfs_dio_private {
 299         struct inode *inode;
 300         unsigned long flags;
 301         u64 logical_offset;
 302         u64 disk_bytenr;
 303         u64 bytes;
 304         void *private;
 305
 306         /* number of bios pending for this dio */
 307         atomic_t pending_bios;
 308
 309         /* IO errors */
 310         int errors;
 311
 312         /* orig_bio is our btrfs_io_bio */
 313         struct bio *orig_bio;
 314
 315         /* dio_bio came from fs/direct-io.c */
 316         struct bio *dio_bio;
 317
 318         /*
 319          * The original bio may be split to several sub-bios, this is
 320          * done during endio of sub-bios
 321          */
 322         blk_status_t (*subio_endio)(struct inode *, struct btrfs_io_bio *,
 323                         blk_status_t);
 324 };
 325
 326 /*
 327  * Disable DIO read nolock optimization, so new dio readers will be forced
 328  * to grab i_mutex. It is used to avoid the endless truncate due to
 329  * nonlocked dio read.
 330  */
 331 static inline void btrfs_inode_block_unlocked_dio(struct btrfs_inode *inode)
 332 {
 333         set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags);
 334         smp_mb();
 335 }
 336
 337 static inline void btrfs_inode_resume_unlocked_dio(struct btrfs_inode *inode)
 338 {
 339         smp_mb__before_atomic();
 340         clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags);
 341 }
 342
 343 static inline void btrfs_print_data_csum_error(struct btrfs_inode *inode,
 344                 u64 logical_start, u32 csum, u32 csum_expected, int mirror_num)
 345 {
 346         struct btrfs_root *root = inode->root;
 347
 348         /* Output minus objectid, which is more meaningful */
 349         if (root->objectid >= BTRFS_LAST_FREE_OBJECTID)
 350                 btrfs_warn_rl(root->fs_info,
 351         "csum failed root %lld ino %lld off %llu csum 0x%08x expected csum 0x%08x mirror %d",
 352                         root->objectid, btrfs_ino(inode),
 353                         logical_start, csum, csum_expected, mirror_num);
 354         else
 355                 btrfs_warn_rl(root->fs_info,
 356         "csum failed root %llu ino %llu off %llu csum 0x%08x expected csum 0x%08x mirror %d",
 357                         root->objectid, btrfs_ino(inode),
 358                         logical_start, csum, csum_expected, mirror_num);
 359 }
 360
 361 #endif