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TOMOYO Linux Cross Reference
Linux/fs/btrfs/ctree.h

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  1 /*
  2  * Copyright (C) 2007 Oracle.  All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public
  6  * License v2 as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11  * General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public
 14  * License along with this program; if not, write to the
 15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 16  * Boston, MA 021110-1307, USA.
 17  */
 18 
 19 #ifndef __BTRFS_CTREE__
 20 #define __BTRFS_CTREE__
 21 
 22 #include <linux/mm.h>
 23 #include <linux/highmem.h>
 24 #include <linux/fs.h>
 25 #include <linux/rwsem.h>
 26 #include <linux/semaphore.h>
 27 #include <linux/completion.h>
 28 #include <linux/backing-dev.h>
 29 #include <linux/wait.h>
 30 #include <linux/slab.h>
 31 #include <linux/kobject.h>
 32 #include <trace/events/btrfs.h>
 33 #include <asm/kmap_types.h>
 34 #include <linux/pagemap.h>
 35 #include <linux/btrfs.h>
 36 #include <linux/workqueue.h>
 37 #include <linux/security.h>
 38 #include "extent_io.h"
 39 #include "extent_map.h"
 40 #include "async-thread.h"
 41 
 42 struct btrfs_trans_handle;
 43 struct btrfs_transaction;
 44 struct btrfs_pending_snapshot;
 45 extern struct kmem_cache *btrfs_trans_handle_cachep;
 46 extern struct kmem_cache *btrfs_transaction_cachep;
 47 extern struct kmem_cache *btrfs_bit_radix_cachep;
 48 extern struct kmem_cache *btrfs_path_cachep;
 49 extern struct kmem_cache *btrfs_free_space_cachep;
 50 struct btrfs_ordered_sum;
 51 
 52 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 53 #define STATIC noinline
 54 #else
 55 #define STATIC static noinline
 56 #endif
 57 
 58 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 59 
 60 #define BTRFS_MAX_MIRRORS 3
 61 
 62 #define BTRFS_MAX_LEVEL 8
 63 
 64 #define BTRFS_COMPAT_EXTENT_TREE_V0
 65 
 66 /* holds pointers to all of the tree roots */
 67 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
 68 
 69 /* stores information about which extents are in use, and reference counts */
 70 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
 71 
 72 /*
 73  * chunk tree stores translations from logical -> physical block numbering
 74  * the super block points to the chunk tree
 75  */
 76 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
 77 
 78 /*
 79  * stores information about which areas of a given device are in use.
 80  * one per device.  The tree of tree roots points to the device tree
 81  */
 82 #define BTRFS_DEV_TREE_OBJECTID 4ULL
 83 
 84 /* one per subvolume, storing files and directories */
 85 #define BTRFS_FS_TREE_OBJECTID 5ULL
 86 
 87 /* directory objectid inside the root tree */
 88 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
 89 
 90 /* holds checksums of all the data extents */
 91 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
 92 
 93 /* holds quota configuration and tracking */
 94 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
 95 
 96 /* for storing items that use the BTRFS_UUID_KEY* types */
 97 #define BTRFS_UUID_TREE_OBJECTID 9ULL
 98 
 99 /* for storing balance parameters in the root tree */
100 #define BTRFS_BALANCE_OBJECTID -4ULL
101 
102 /* orhpan objectid for tracking unlinked/truncated files */
103 #define BTRFS_ORPHAN_OBJECTID -5ULL
104 
105 /* does write ahead logging to speed up fsyncs */
106 #define BTRFS_TREE_LOG_OBJECTID -6ULL
107 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
108 
109 /* for space balancing */
110 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
111 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
112 
113 /*
114  * extent checksums all have this objectid
115  * this allows them to share the logging tree
116  * for fsyncs
117  */
118 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
119 
120 /* For storing free space cache */
121 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
122 
123 /*
124  * The inode number assigned to the special inode for storing
125  * free ino cache
126  */
127 #define BTRFS_FREE_INO_OBJECTID -12ULL
128 
129 /* dummy objectid represents multiple objectids */
130 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
131 
132 /*
133  * All files have objectids in this range.
134  */
135 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
136 #define BTRFS_LAST_FREE_OBJECTID -256ULL
137 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
138 
139 
140 /*
141  * the device items go into the chunk tree.  The key is in the form
142  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
143  */
144 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
145 
146 #define BTRFS_BTREE_INODE_OBJECTID 1
147 
148 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
149 
150 #define BTRFS_DEV_REPLACE_DEVID 0ULL
151 
152 /*
153  * the max metadata block size.  This limit is somewhat artificial,
154  * but the memmove costs go through the roof for larger blocks.
155  */
156 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
157 
158 /*
159  * we can actually store much bigger names, but lets not confuse the rest
160  * of linux
161  */
162 #define BTRFS_NAME_LEN 255
163 
164 /*
165  * Theoretical limit is larger, but we keep this down to a sane
166  * value. That should limit greatly the possibility of collisions on
167  * inode ref items.
168  */
169 #define BTRFS_LINK_MAX 65535U
170 
171 /* 32 bytes in various csum fields */
172 #define BTRFS_CSUM_SIZE 32
173 
174 /* csum types */
175 #define BTRFS_CSUM_TYPE_CRC32   0
176 
177 static int btrfs_csum_sizes[] = { 4 };
178 
179 /* four bytes for CRC32 */
180 #define BTRFS_EMPTY_DIR_SIZE 0
181 
182 /* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
183 #define REQ_GET_READ_MIRRORS    (1 << 30)
184 
185 #define BTRFS_FT_UNKNOWN        0
186 #define BTRFS_FT_REG_FILE       1
187 #define BTRFS_FT_DIR            2
188 #define BTRFS_FT_CHRDEV         3
189 #define BTRFS_FT_BLKDEV         4
190 #define BTRFS_FT_FIFO           5
191 #define BTRFS_FT_SOCK           6
192 #define BTRFS_FT_SYMLINK        7
193 #define BTRFS_FT_XATTR          8
194 #define BTRFS_FT_MAX            9
195 
196 /* ioprio of readahead is set to idle */
197 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
198 
199 #define BTRFS_DIRTY_METADATA_THRESH     (32 * 1024 * 1024)
200 
201 #define BTRFS_MAX_EXTENT_SIZE (128 * 1024 * 1024)
202 
203 /*
204  * The key defines the order in the tree, and so it also defines (optimal)
205  * block layout.
206  *
207  * objectid corresponds to the inode number.
208  *
209  * type tells us things about the object, and is a kind of stream selector.
210  * so for a given inode, keys with type of 1 might refer to the inode data,
211  * type of 2 may point to file data in the btree and type == 3 may point to
212  * extents.
213  *
214  * offset is the starting byte offset for this key in the stream.
215  *
216  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
217  * in cpu native order.  Otherwise they are identical and their sizes
218  * should be the same (ie both packed)
219  */
220 struct btrfs_disk_key {
221         __le64 objectid;
222         u8 type;
223         __le64 offset;
224 } __attribute__ ((__packed__));
225 
226 struct btrfs_key {
227         u64 objectid;
228         u8 type;
229         u64 offset;
230 } __attribute__ ((__packed__));
231 
232 struct btrfs_mapping_tree {
233         struct extent_map_tree map_tree;
234 };
235 
236 struct btrfs_dev_item {
237         /* the internal btrfs device id */
238         __le64 devid;
239 
240         /* size of the device */
241         __le64 total_bytes;
242 
243         /* bytes used */
244         __le64 bytes_used;
245 
246         /* optimal io alignment for this device */
247         __le32 io_align;
248 
249         /* optimal io width for this device */
250         __le32 io_width;
251 
252         /* minimal io size for this device */
253         __le32 sector_size;
254 
255         /* type and info about this device */
256         __le64 type;
257 
258         /* expected generation for this device */
259         __le64 generation;
260 
261         /*
262          * starting byte of this partition on the device,
263          * to allow for stripe alignment in the future
264          */
265         __le64 start_offset;
266 
267         /* grouping information for allocation decisions */
268         __le32 dev_group;
269 
270         /* seek speed 0-100 where 100 is fastest */
271         u8 seek_speed;
272 
273         /* bandwidth 0-100 where 100 is fastest */
274         u8 bandwidth;
275 
276         /* btrfs generated uuid for this device */
277         u8 uuid[BTRFS_UUID_SIZE];
278 
279         /* uuid of FS who owns this device */
280         u8 fsid[BTRFS_UUID_SIZE];
281 } __attribute__ ((__packed__));
282 
283 struct btrfs_stripe {
284         __le64 devid;
285         __le64 offset;
286         u8 dev_uuid[BTRFS_UUID_SIZE];
287 } __attribute__ ((__packed__));
288 
289 struct btrfs_chunk {
290         /* size of this chunk in bytes */
291         __le64 length;
292 
293         /* objectid of the root referencing this chunk */
294         __le64 owner;
295 
296         __le64 stripe_len;
297         __le64 type;
298 
299         /* optimal io alignment for this chunk */
300         __le32 io_align;
301 
302         /* optimal io width for this chunk */
303         __le32 io_width;
304 
305         /* minimal io size for this chunk */
306         __le32 sector_size;
307 
308         /* 2^16 stripes is quite a lot, a second limit is the size of a single
309          * item in the btree
310          */
311         __le16 num_stripes;
312 
313         /* sub stripes only matter for raid10 */
314         __le16 sub_stripes;
315         struct btrfs_stripe stripe;
316         /* additional stripes go here */
317 } __attribute__ ((__packed__));
318 
319 #define BTRFS_FREE_SPACE_EXTENT 1
320 #define BTRFS_FREE_SPACE_BITMAP 2
321 
322 struct btrfs_free_space_entry {
323         __le64 offset;
324         __le64 bytes;
325         u8 type;
326 } __attribute__ ((__packed__));
327 
328 struct btrfs_free_space_header {
329         struct btrfs_disk_key location;
330         __le64 generation;
331         __le64 num_entries;
332         __le64 num_bitmaps;
333 } __attribute__ ((__packed__));
334 
335 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
336 {
337         BUG_ON(num_stripes == 0);
338         return sizeof(struct btrfs_chunk) +
339                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
340 }
341 
342 #define BTRFS_HEADER_FLAG_WRITTEN       (1ULL << 0)
343 #define BTRFS_HEADER_FLAG_RELOC         (1ULL << 1)
344 
345 /*
346  * File system states
347  */
348 #define BTRFS_FS_STATE_ERROR            0
349 #define BTRFS_FS_STATE_REMOUNTING       1
350 #define BTRFS_FS_STATE_TRANS_ABORTED    2
351 #define BTRFS_FS_STATE_DEV_REPLACING    3
352 
353 /* Super block flags */
354 /* Errors detected */
355 #define BTRFS_SUPER_FLAG_ERROR          (1ULL << 2)
356 
357 #define BTRFS_SUPER_FLAG_SEEDING        (1ULL << 32)
358 #define BTRFS_SUPER_FLAG_METADUMP       (1ULL << 33)
359 
360 #define BTRFS_BACKREF_REV_MAX           256
361 #define BTRFS_BACKREF_REV_SHIFT         56
362 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
363                                          BTRFS_BACKREF_REV_SHIFT)
364 
365 #define BTRFS_OLD_BACKREF_REV           0
366 #define BTRFS_MIXED_BACKREF_REV         1
367 
368 /*
369  * every tree block (leaf or node) starts with this header.
370  */
371 struct btrfs_header {
372         /* these first four must match the super block */
373         u8 csum[BTRFS_CSUM_SIZE];
374         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
375         __le64 bytenr; /* which block this node is supposed to live in */
376         __le64 flags;
377 
378         /* allowed to be different from the super from here on down */
379         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
380         __le64 generation;
381         __le64 owner;
382         __le32 nritems;
383         u8 level;
384 } __attribute__ ((__packed__));
385 
386 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
387                                       sizeof(struct btrfs_header)) / \
388                                      sizeof(struct btrfs_key_ptr))
389 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
390 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))
391 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
392                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
393 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
394                                         sizeof(struct btrfs_item) - \
395                                         BTRFS_FILE_EXTENT_INLINE_DATA_START)
396 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
397                                  sizeof(struct btrfs_item) -\
398                                  sizeof(struct btrfs_dir_item))
399 
400 
401 /*
402  * this is a very generous portion of the super block, giving us
403  * room to translate 14 chunks with 3 stripes each.
404  */
405 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
406 #define BTRFS_LABEL_SIZE 256
407 
408 /*
409  * just in case we somehow lose the roots and are not able to mount,
410  * we store an array of the roots from previous transactions
411  * in the super.
412  */
413 #define BTRFS_NUM_BACKUP_ROOTS 4
414 struct btrfs_root_backup {
415         __le64 tree_root;
416         __le64 tree_root_gen;
417 
418         __le64 chunk_root;
419         __le64 chunk_root_gen;
420 
421         __le64 extent_root;
422         __le64 extent_root_gen;
423 
424         __le64 fs_root;
425         __le64 fs_root_gen;
426 
427         __le64 dev_root;
428         __le64 dev_root_gen;
429 
430         __le64 csum_root;
431         __le64 csum_root_gen;
432 
433         __le64 total_bytes;
434         __le64 bytes_used;
435         __le64 num_devices;
436         /* future */
437         __le64 unused_64[4];
438 
439         u8 tree_root_level;
440         u8 chunk_root_level;
441         u8 extent_root_level;
442         u8 fs_root_level;
443         u8 dev_root_level;
444         u8 csum_root_level;
445         /* future and to align */
446         u8 unused_8[10];
447 } __attribute__ ((__packed__));
448 
449 /*
450  * the super block basically lists the main trees of the FS
451  * it currently lacks any block count etc etc
452  */
453 struct btrfs_super_block {
454         u8 csum[BTRFS_CSUM_SIZE];
455         /* the first 4 fields must match struct btrfs_header */
456         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
457         __le64 bytenr; /* this block number */
458         __le64 flags;
459 
460         /* allowed to be different from the btrfs_header from here own down */
461         __le64 magic;
462         __le64 generation;
463         __le64 root;
464         __le64 chunk_root;
465         __le64 log_root;
466 
467         /* this will help find the new super based on the log root */
468         __le64 log_root_transid;
469         __le64 total_bytes;
470         __le64 bytes_used;
471         __le64 root_dir_objectid;
472         __le64 num_devices;
473         __le32 sectorsize;
474         __le32 nodesize;
475         __le32 __unused_leafsize;
476         __le32 stripesize;
477         __le32 sys_chunk_array_size;
478         __le64 chunk_root_generation;
479         __le64 compat_flags;
480         __le64 compat_ro_flags;
481         __le64 incompat_flags;
482         __le16 csum_type;
483         u8 root_level;
484         u8 chunk_root_level;
485         u8 log_root_level;
486         struct btrfs_dev_item dev_item;
487 
488         char label[BTRFS_LABEL_SIZE];
489 
490         __le64 cache_generation;
491         __le64 uuid_tree_generation;
492 
493         /* future expansion */
494         __le64 reserved[30];
495         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
496         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
497 } __attribute__ ((__packed__));
498 
499 /*
500  * Compat flags that we support.  If any incompat flags are set other than the
501  * ones specified below then we will fail to mount
502  */
503 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
504 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
505 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
506 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
507 /*
508  * some patches floated around with a second compression method
509  * lets save that incompat here for when they do get in
510  * Note we don't actually support it, we're just reserving the
511  * number
512  */
513 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2   (1ULL << 4)
514 
515 /*
516  * older kernels tried to do bigger metadata blocks, but the
517  * code was pretty buggy.  Lets not let them try anymore.
518  */
519 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
520 
521 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
522 #define BTRFS_FEATURE_INCOMPAT_RAID56           (1ULL << 7)
523 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA  (1ULL << 8)
524 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES         (1ULL << 9)
525 
526 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
527 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
528 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
529 #define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
530 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
531 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
532 
533 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
534         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
535          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
536          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
537          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
538          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
539          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
540          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
541          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
542          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
543 
544 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
545         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
546 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
547 
548 /*
549  * A leaf is full of items. offset and size tell us where to find
550  * the item in the leaf (relative to the start of the data area)
551  */
552 struct btrfs_item {
553         struct btrfs_disk_key key;
554         __le32 offset;
555         __le32 size;
556 } __attribute__ ((__packed__));
557 
558 /*
559  * leaves have an item area and a data area:
560  * [item0, item1....itemN] [free space] [dataN...data1, data0]
561  *
562  * The data is separate from the items to get the keys closer together
563  * during searches.
564  */
565 struct btrfs_leaf {
566         struct btrfs_header header;
567         struct btrfs_item items[];
568 } __attribute__ ((__packed__));
569 
570 /*
571  * all non-leaf blocks are nodes, they hold only keys and pointers to
572  * other blocks
573  */
574 struct btrfs_key_ptr {
575         struct btrfs_disk_key key;
576         __le64 blockptr;
577         __le64 generation;
578 } __attribute__ ((__packed__));
579 
580 struct btrfs_node {
581         struct btrfs_header header;
582         struct btrfs_key_ptr ptrs[];
583 } __attribute__ ((__packed__));
584 
585 /*
586  * btrfs_paths remember the path taken from the root down to the leaf.
587  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
588  * to any other levels that are present.
589  *
590  * The slots array records the index of the item or block pointer
591  * used while walking the tree.
592  */
593 struct btrfs_path {
594         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
595         int slots[BTRFS_MAX_LEVEL];
596         /* if there is real range locking, this locks field will change */
597         int locks[BTRFS_MAX_LEVEL];
598         int reada;
599         /* keep some upper locks as we walk down */
600         int lowest_level;
601 
602         /*
603          * set by btrfs_split_item, tells search_slot to keep all locks
604          * and to force calls to keep space in the nodes
605          */
606         unsigned int search_for_split:1;
607         unsigned int keep_locks:1;
608         unsigned int skip_locking:1;
609         unsigned int leave_spinning:1;
610         unsigned int search_commit_root:1;
611         unsigned int need_commit_sem:1;
612         unsigned int skip_release_on_error:1;
613 };
614 
615 /*
616  * items in the extent btree are used to record the objectid of the
617  * owner of the block and the number of references
618  */
619 
620 struct btrfs_extent_item {
621         __le64 refs;
622         __le64 generation;
623         __le64 flags;
624 } __attribute__ ((__packed__));
625 
626 struct btrfs_extent_item_v0 {
627         __le32 refs;
628 } __attribute__ ((__packed__));
629 
630 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
631                                         sizeof(struct btrfs_item))
632 
633 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
634 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
635 
636 /* following flags only apply to tree blocks */
637 
638 /* use full backrefs for extent pointers in the block */
639 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
640 
641 /*
642  * this flag is only used internally by scrub and may be changed at any time
643  * it is only declared here to avoid collisions
644  */
645 #define BTRFS_EXTENT_FLAG_SUPER         (1ULL << 48)
646 
647 struct btrfs_tree_block_info {
648         struct btrfs_disk_key key;
649         u8 level;
650 } __attribute__ ((__packed__));
651 
652 struct btrfs_extent_data_ref {
653         __le64 root;
654         __le64 objectid;
655         __le64 offset;
656         __le32 count;
657 } __attribute__ ((__packed__));
658 
659 struct btrfs_shared_data_ref {
660         __le32 count;
661 } __attribute__ ((__packed__));
662 
663 struct btrfs_extent_inline_ref {
664         u8 type;
665         __le64 offset;
666 } __attribute__ ((__packed__));
667 
668 /* old style backrefs item */
669 struct btrfs_extent_ref_v0 {
670         __le64 root;
671         __le64 generation;
672         __le64 objectid;
673         __le32 count;
674 } __attribute__ ((__packed__));
675 
676 
677 /* dev extents record free space on individual devices.  The owner
678  * field points back to the chunk allocation mapping tree that allocated
679  * the extent.  The chunk tree uuid field is a way to double check the owner
680  */
681 struct btrfs_dev_extent {
682         __le64 chunk_tree;
683         __le64 chunk_objectid;
684         __le64 chunk_offset;
685         __le64 length;
686         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
687 } __attribute__ ((__packed__));
688 
689 struct btrfs_inode_ref {
690         __le64 index;
691         __le16 name_len;
692         /* name goes here */
693 } __attribute__ ((__packed__));
694 
695 struct btrfs_inode_extref {
696         __le64 parent_objectid;
697         __le64 index;
698         __le16 name_len;
699         __u8   name[0];
700         /* name goes here */
701 } __attribute__ ((__packed__));
702 
703 struct btrfs_timespec {
704         __le64 sec;
705         __le32 nsec;
706 } __attribute__ ((__packed__));
707 
708 enum btrfs_compression_type {
709         BTRFS_COMPRESS_NONE  = 0,
710         BTRFS_COMPRESS_ZLIB  = 1,
711         BTRFS_COMPRESS_LZO   = 2,
712         BTRFS_COMPRESS_TYPES = 2,
713         BTRFS_COMPRESS_LAST  = 3,
714 };
715 
716 struct btrfs_inode_item {
717         /* nfs style generation number */
718         __le64 generation;
719         /* transid that last touched this inode */
720         __le64 transid;
721         __le64 size;
722         __le64 nbytes;
723         __le64 block_group;
724         __le32 nlink;
725         __le32 uid;
726         __le32 gid;
727         __le32 mode;
728         __le64 rdev;
729         __le64 flags;
730 
731         /* modification sequence number for NFS */
732         __le64 sequence;
733 
734         /*
735          * a little future expansion, for more than this we can
736          * just grow the inode item and version it
737          */
738         __le64 reserved[4];
739         struct btrfs_timespec atime;
740         struct btrfs_timespec ctime;
741         struct btrfs_timespec mtime;
742         struct btrfs_timespec otime;
743 } __attribute__ ((__packed__));
744 
745 struct btrfs_dir_log_item {
746         __le64 end;
747 } __attribute__ ((__packed__));
748 
749 struct btrfs_dir_item {
750         struct btrfs_disk_key location;
751         __le64 transid;
752         __le16 data_len;
753         __le16 name_len;
754         u8 type;
755 } __attribute__ ((__packed__));
756 
757 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
758 
759 /*
760  * Internal in-memory flag that a subvolume has been marked for deletion but
761  * still visible as a directory
762  */
763 #define BTRFS_ROOT_SUBVOL_DEAD          (1ULL << 48)
764 
765 struct btrfs_root_item {
766         struct btrfs_inode_item inode;
767         __le64 generation;
768         __le64 root_dirid;
769         __le64 bytenr;
770         __le64 byte_limit;
771         __le64 bytes_used;
772         __le64 last_snapshot;
773         __le64 flags;
774         __le32 refs;
775         struct btrfs_disk_key drop_progress;
776         u8 drop_level;
777         u8 level;
778 
779         /*
780          * The following fields appear after subvol_uuids+subvol_times
781          * were introduced.
782          */
783 
784         /*
785          * This generation number is used to test if the new fields are valid
786          * and up to date while reading the root item. Everytime the root item
787          * is written out, the "generation" field is copied into this field. If
788          * anyone ever mounted the fs with an older kernel, we will have
789          * mismatching generation values here and thus must invalidate the
790          * new fields. See btrfs_update_root and btrfs_find_last_root for
791          * details.
792          * the offset of generation_v2 is also used as the start for the memset
793          * when invalidating the fields.
794          */
795         __le64 generation_v2;
796         u8 uuid[BTRFS_UUID_SIZE];
797         u8 parent_uuid[BTRFS_UUID_SIZE];
798         u8 received_uuid[BTRFS_UUID_SIZE];
799         __le64 ctransid; /* updated when an inode changes */
800         __le64 otransid; /* trans when created */
801         __le64 stransid; /* trans when sent. non-zero for received subvol */
802         __le64 rtransid; /* trans when received. non-zero for received subvol */
803         struct btrfs_timespec ctime;
804         struct btrfs_timespec otime;
805         struct btrfs_timespec stime;
806         struct btrfs_timespec rtime;
807         __le64 reserved[8]; /* for future */
808 } __attribute__ ((__packed__));
809 
810 /*
811  * this is used for both forward and backward root refs
812  */
813 struct btrfs_root_ref {
814         __le64 dirid;
815         __le64 sequence;
816         __le16 name_len;
817 } __attribute__ ((__packed__));
818 
819 struct btrfs_disk_balance_args {
820         /*
821          * profiles to operate on, single is denoted by
822          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
823          */
824         __le64 profiles;
825 
826         /* usage filter */
827         __le64 usage;
828 
829         /* devid filter */
830         __le64 devid;
831 
832         /* devid subset filter [pstart..pend) */
833         __le64 pstart;
834         __le64 pend;
835 
836         /* btrfs virtual address space subset filter [vstart..vend) */
837         __le64 vstart;
838         __le64 vend;
839 
840         /*
841          * profile to convert to, single is denoted by
842          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
843          */
844         __le64 target;
845 
846         /* BTRFS_BALANCE_ARGS_* */
847         __le64 flags;
848 
849         /* BTRFS_BALANCE_ARGS_LIMIT value */
850         __le64 limit;
851 
852         __le64 unused[7];
853 } __attribute__ ((__packed__));
854 
855 /*
856  * store balance parameters to disk so that balance can be properly
857  * resumed after crash or unmount
858  */
859 struct btrfs_balance_item {
860         /* BTRFS_BALANCE_* */
861         __le64 flags;
862 
863         struct btrfs_disk_balance_args data;
864         struct btrfs_disk_balance_args meta;
865         struct btrfs_disk_balance_args sys;
866 
867         __le64 unused[4];
868 } __attribute__ ((__packed__));
869 
870 #define BTRFS_FILE_EXTENT_INLINE 0
871 #define BTRFS_FILE_EXTENT_REG 1
872 #define BTRFS_FILE_EXTENT_PREALLOC 2
873 
874 struct btrfs_file_extent_item {
875         /*
876          * transaction id that created this extent
877          */
878         __le64 generation;
879         /*
880          * max number of bytes to hold this extent in ram
881          * when we split a compressed extent we can't know how big
882          * each of the resulting pieces will be.  So, this is
883          * an upper limit on the size of the extent in ram instead of
884          * an exact limit.
885          */
886         __le64 ram_bytes;
887 
888         /*
889          * 32 bits for the various ways we might encode the data,
890          * including compression and encryption.  If any of these
891          * are set to something a given disk format doesn't understand
892          * it is treated like an incompat flag for reading and writing,
893          * but not for stat.
894          */
895         u8 compression;
896         u8 encryption;
897         __le16 other_encoding; /* spare for later use */
898 
899         /* are we inline data or a real extent? */
900         u8 type;
901 
902         /*
903          * disk space consumed by the extent, checksum blocks are included
904          * in these numbers
905          *
906          * At this offset in the structure, the inline extent data start.
907          */
908         __le64 disk_bytenr;
909         __le64 disk_num_bytes;
910         /*
911          * the logical offset in file blocks (no csums)
912          * this extent record is for.  This allows a file extent to point
913          * into the middle of an existing extent on disk, sharing it
914          * between two snapshots (useful if some bytes in the middle of the
915          * extent have changed
916          */
917         __le64 offset;
918         /*
919          * the logical number of file blocks (no csums included).  This
920          * always reflects the size uncompressed and without encoding.
921          */
922         __le64 num_bytes;
923 
924 } __attribute__ ((__packed__));
925 
926 struct btrfs_csum_item {
927         u8 csum;
928 } __attribute__ ((__packed__));
929 
930 struct btrfs_dev_stats_item {
931         /*
932          * grow this item struct at the end for future enhancements and keep
933          * the existing values unchanged
934          */
935         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
936 } __attribute__ ((__packed__));
937 
938 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS     0
939 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID      1
940 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED      0
941 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED            1
942 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED          2
943 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED           3
944 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED           4
945 
946 struct btrfs_dev_replace {
947         u64 replace_state;      /* see #define above */
948         u64 time_started;       /* seconds since 1-Jan-1970 */
949         u64 time_stopped;       /* seconds since 1-Jan-1970 */
950         atomic64_t num_write_errors;
951         atomic64_t num_uncorrectable_read_errors;
952 
953         u64 cursor_left;
954         u64 committed_cursor_left;
955         u64 cursor_left_last_write_of_item;
956         u64 cursor_right;
957 
958         u64 cont_reading_from_srcdev_mode;      /* see #define above */
959 
960         int is_valid;
961         int item_needs_writeback;
962         struct btrfs_device *srcdev;
963         struct btrfs_device *tgtdev;
964 
965         pid_t lock_owner;
966         atomic_t nesting_level;
967         struct mutex lock_finishing_cancel_unmount;
968         struct mutex lock_management_lock;
969         struct mutex lock;
970 
971         struct btrfs_scrub_progress scrub_progress;
972 };
973 
974 struct btrfs_dev_replace_item {
975         /*
976          * grow this item struct at the end for future enhancements and keep
977          * the existing values unchanged
978          */
979         __le64 src_devid;
980         __le64 cursor_left;
981         __le64 cursor_right;
982         __le64 cont_reading_from_srcdev_mode;
983 
984         __le64 replace_state;
985         __le64 time_started;
986         __le64 time_stopped;
987         __le64 num_write_errors;
988         __le64 num_uncorrectable_read_errors;
989 } __attribute__ ((__packed__));
990 
991 /* different types of block groups (and chunks) */
992 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
993 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
994 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
995 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
996 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
997 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
998 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
999 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
1000 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
1001 #define BTRFS_BLOCK_GROUP_RESERVED      (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
1002                                          BTRFS_SPACE_INFO_GLOBAL_RSV)
1003 
1004 enum btrfs_raid_types {
1005         BTRFS_RAID_RAID10,
1006         BTRFS_RAID_RAID1,
1007         BTRFS_RAID_DUP,
1008         BTRFS_RAID_RAID0,
1009         BTRFS_RAID_SINGLE,
1010         BTRFS_RAID_RAID5,
1011         BTRFS_RAID_RAID6,
1012         BTRFS_NR_RAID_TYPES
1013 };
1014 
1015 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
1016                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
1017                                          BTRFS_BLOCK_GROUP_METADATA)
1018 
1019 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
1020                                          BTRFS_BLOCK_GROUP_RAID1 |   \
1021                                          BTRFS_BLOCK_GROUP_RAID5 |   \
1022                                          BTRFS_BLOCK_GROUP_RAID6 |   \
1023                                          BTRFS_BLOCK_GROUP_DUP |     \
1024                                          BTRFS_BLOCK_GROUP_RAID10)
1025 #define BTRFS_BLOCK_GROUP_RAID56_MASK   (BTRFS_BLOCK_GROUP_RAID5 |   \
1026                                          BTRFS_BLOCK_GROUP_RAID6)
1027 
1028 /*
1029  * We need a bit for restriper to be able to tell when chunks of type
1030  * SINGLE are available.  This "extended" profile format is used in
1031  * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
1032  * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
1033  * to avoid remappings between two formats in future.
1034  */
1035 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
1036 
1037 /*
1038  * A fake block group type that is used to communicate global block reserve
1039  * size to userspace via the SPACE_INFO ioctl.
1040  */
1041 #define BTRFS_SPACE_INFO_GLOBAL_RSV     (1ULL << 49)
1042 
1043 #define BTRFS_EXTENDED_PROFILE_MASK     (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
1044                                          BTRFS_AVAIL_ALLOC_BIT_SINGLE)
1045 
1046 static inline u64 chunk_to_extended(u64 flags)
1047 {
1048         if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
1049                 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1050 
1051         return flags;
1052 }
1053 static inline u64 extended_to_chunk(u64 flags)
1054 {
1055         return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1056 }
1057 
1058 struct btrfs_block_group_item {
1059         __le64 used;
1060         __le64 chunk_objectid;
1061         __le64 flags;
1062 } __attribute__ ((__packed__));
1063 
1064 #define BTRFS_QGROUP_LEVEL_SHIFT                48
1065 static inline u64 btrfs_qgroup_level(u64 qgroupid)
1066 {
1067         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
1068 }
1069 
1070 /*
1071  * is subvolume quota turned on?
1072  */
1073 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
1074 /*
1075  * RESCAN is set during the initialization phase
1076  */
1077 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
1078 /*
1079  * Some qgroup entries are known to be out of date,
1080  * either because the configuration has changed in a way that
1081  * makes a rescan necessary, or because the fs has been mounted
1082  * with a non-qgroup-aware version.
1083  * Turning qouta off and on again makes it inconsistent, too.
1084  */
1085 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
1086 
1087 #define BTRFS_QGROUP_STATUS_VERSION        1
1088 
1089 struct btrfs_qgroup_status_item {
1090         __le64 version;
1091         /*
1092          * the generation is updated during every commit. As older
1093          * versions of btrfs are not aware of qgroups, it will be
1094          * possible to detect inconsistencies by checking the
1095          * generation on mount time
1096          */
1097         __le64 generation;
1098 
1099         /* flag definitions see above */
1100         __le64 flags;
1101 
1102         /*
1103          * only used during scanning to record the progress
1104          * of the scan. It contains a logical address
1105          */
1106         __le64 rescan;
1107 } __attribute__ ((__packed__));
1108 
1109 struct btrfs_qgroup_info_item {
1110         __le64 generation;
1111         __le64 rfer;
1112         __le64 rfer_cmpr;
1113         __le64 excl;
1114         __le64 excl_cmpr;
1115 } __attribute__ ((__packed__));
1116 
1117 /* flags definition for qgroup limits */
1118 #define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
1119 #define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
1120 #define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
1121 #define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
1122 #define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
1123 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
1124 
1125 struct btrfs_qgroup_limit_item {
1126         /*
1127          * only updated when any of the other values change
1128          */
1129         __le64 flags;
1130         __le64 max_rfer;
1131         __le64 max_excl;
1132         __le64 rsv_rfer;
1133         __le64 rsv_excl;
1134 } __attribute__ ((__packed__));
1135 
1136 /* For raid type sysfs entries */
1137 struct raid_kobject {
1138         int raid_type;
1139         struct kobject kobj;
1140 };
1141 
1142 struct btrfs_space_info {
1143         spinlock_t lock;
1144 
1145         u64 total_bytes;        /* total bytes in the space,
1146                                    this doesn't take mirrors into account */
1147         u64 bytes_used;         /* total bytes used,
1148                                    this doesn't take mirrors into account */
1149         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
1150                                    transaction finishes */
1151         u64 bytes_reserved;     /* total bytes the allocator has reserved for
1152                                    current allocations */
1153         u64 bytes_may_use;      /* number of bytes that may be used for
1154                                    delalloc/allocations */
1155         u64 bytes_readonly;     /* total bytes that are read only */
1156 
1157         unsigned int full:1;    /* indicates that we cannot allocate any more
1158                                    chunks for this space */
1159         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
1160 
1161         unsigned int flush:1;           /* set if we are trying to make space */
1162 
1163         unsigned int force_alloc;       /* set if we need to force a chunk
1164                                            alloc for this space */
1165 
1166         u64 disk_used;          /* total bytes used on disk */
1167         u64 disk_total;         /* total bytes on disk, takes mirrors into
1168                                    account */
1169 
1170         u64 flags;
1171 
1172         /*
1173          * bytes_pinned is kept in line with what is actually pinned, as in
1174          * we've called update_block_group and dropped the bytes_used counter
1175          * and increased the bytes_pinned counter.  However this means that
1176          * bytes_pinned does not reflect the bytes that will be pinned once the
1177          * delayed refs are flushed, so this counter is inc'ed everytime we call
1178          * btrfs_free_extent so it is a realtime count of what will be freed
1179          * once the transaction is committed.  It will be zero'ed everytime the
1180          * transaction commits.
1181          */
1182         struct percpu_counter total_bytes_pinned;
1183 
1184         struct list_head list;
1185         /* Protected by the spinlock 'lock'. */
1186         struct list_head ro_bgs;
1187 
1188         struct rw_semaphore groups_sem;
1189         /* for block groups in our same type */
1190         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1191         wait_queue_head_t wait;
1192 
1193         struct kobject kobj;
1194         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
1195 };
1196 
1197 #define BTRFS_BLOCK_RSV_GLOBAL          1
1198 #define BTRFS_BLOCK_RSV_DELALLOC        2
1199 #define BTRFS_BLOCK_RSV_TRANS           3
1200 #define BTRFS_BLOCK_RSV_CHUNK           4
1201 #define BTRFS_BLOCK_RSV_DELOPS          5
1202 #define BTRFS_BLOCK_RSV_EMPTY           6
1203 #define BTRFS_BLOCK_RSV_TEMP            7
1204 
1205 struct btrfs_block_rsv {
1206         u64 size;
1207         u64 reserved;
1208         struct btrfs_space_info *space_info;
1209         spinlock_t lock;
1210         unsigned short full;
1211         unsigned short type;
1212         unsigned short failfast;
1213 };
1214 
1215 /*
1216  * free clusters are used to claim free space in relatively large chunks,
1217  * allowing us to do less seeky writes.  They are used for all metadata
1218  * allocations and data allocations in ssd mode.
1219  */
1220 struct btrfs_free_cluster {
1221         spinlock_t lock;
1222         spinlock_t refill_lock;
1223         struct rb_root root;
1224 
1225         /* largest extent in this cluster */
1226         u64 max_size;
1227 
1228         /* first extent starting offset */
1229         u64 window_start;
1230 
1231         struct btrfs_block_group_cache *block_group;
1232         /*
1233          * when a cluster is allocated from a block group, we put the
1234          * cluster onto a list in the block group so that it can
1235          * be freed before the block group is freed.
1236          */
1237         struct list_head block_group_list;
1238 };
1239 
1240 enum btrfs_caching_type {
1241         BTRFS_CACHE_NO          = 0,
1242         BTRFS_CACHE_STARTED     = 1,
1243         BTRFS_CACHE_FAST        = 2,
1244         BTRFS_CACHE_FINISHED    = 3,
1245         BTRFS_CACHE_ERROR       = 4,
1246 };
1247 
1248 enum btrfs_disk_cache_state {
1249         BTRFS_DC_WRITTEN        = 0,
1250         BTRFS_DC_ERROR          = 1,
1251         BTRFS_DC_CLEAR          = 2,
1252         BTRFS_DC_SETUP          = 3,
1253 };
1254 
1255 struct btrfs_caching_control {
1256         struct list_head list;
1257         struct mutex mutex;
1258         wait_queue_head_t wait;
1259         struct btrfs_work work;
1260         struct btrfs_block_group_cache *block_group;
1261         u64 progress;
1262         atomic_t count;
1263 };
1264 
1265 struct btrfs_io_ctl {
1266         void *cur, *orig;
1267         struct page *page;
1268         struct page **pages;
1269         struct btrfs_root *root;
1270         struct inode *inode;
1271         unsigned long size;
1272         int index;
1273         int num_pages;
1274         int entries;
1275         int bitmaps;
1276         unsigned check_crcs:1;
1277 };
1278 
1279 struct btrfs_block_group_cache {
1280         struct btrfs_key key;
1281         struct btrfs_block_group_item item;
1282         struct btrfs_fs_info *fs_info;
1283         struct inode *inode;
1284         spinlock_t lock;
1285         u64 pinned;
1286         u64 reserved;
1287         u64 delalloc_bytes;
1288         u64 bytes_super;
1289         u64 flags;
1290         u64 sectorsize;
1291         u64 cache_generation;
1292 
1293         /*
1294          * It is just used for the delayed data space allocation because
1295          * only the data space allocation and the relative metadata update
1296          * can be done cross the transaction.
1297          */
1298         struct rw_semaphore data_rwsem;
1299 
1300         /* for raid56, this is a full stripe, without parity */
1301         unsigned long full_stripe_len;
1302 
1303         unsigned int ro;
1304         unsigned int iref:1;
1305         unsigned int has_caching_ctl:1;
1306         unsigned int removed:1;
1307 
1308         int disk_cache_state;
1309 
1310         /* cache tracking stuff */
1311         int cached;
1312         struct btrfs_caching_control *caching_ctl;
1313         u64 last_byte_to_unpin;
1314 
1315         struct btrfs_space_info *space_info;
1316 
1317         /* free space cache stuff */
1318         struct btrfs_free_space_ctl *free_space_ctl;
1319 
1320         /* block group cache stuff */
1321         struct rb_node cache_node;
1322 
1323         /* for block groups in the same raid type */
1324         struct list_head list;
1325 
1326         /* usage count */
1327         atomic_t count;
1328 
1329         /* List of struct btrfs_free_clusters for this block group.
1330          * Today it will only have one thing on it, but that may change
1331          */
1332         struct list_head cluster_list;
1333 
1334         /* For delayed block group creation or deletion of empty block groups */
1335         struct list_head bg_list;
1336 
1337         /* For read-only block groups */
1338         struct list_head ro_list;
1339 
1340         atomic_t trimming;
1341 
1342         /* For dirty block groups */
1343         struct list_head dirty_list;
1344         struct list_head io_list;
1345 
1346         struct btrfs_io_ctl io_ctl;
1347 };
1348 
1349 /* delayed seq elem */
1350 struct seq_list {
1351         struct list_head list;
1352         u64 seq;
1353 };
1354 
1355 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
1356 
1357 enum btrfs_orphan_cleanup_state {
1358         ORPHAN_CLEANUP_STARTED  = 1,
1359         ORPHAN_CLEANUP_DONE     = 2,
1360 };
1361 
1362 /* used by the raid56 code to lock stripes for read/modify/write */
1363 struct btrfs_stripe_hash {
1364         struct list_head hash_list;
1365         wait_queue_head_t wait;
1366         spinlock_t lock;
1367 };
1368 
1369 /* used by the raid56 code to lock stripes for read/modify/write */
1370 struct btrfs_stripe_hash_table {
1371         struct list_head stripe_cache;
1372         spinlock_t cache_lock;
1373         int cache_size;
1374         struct btrfs_stripe_hash table[];
1375 };
1376 
1377 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
1378 
1379 void btrfs_init_async_reclaim_work(struct work_struct *work);
1380 
1381 /* fs_info */
1382 struct reloc_control;
1383 struct btrfs_device;
1384 struct btrfs_fs_devices;
1385 struct btrfs_balance_control;
1386 struct btrfs_delayed_root;
1387 struct btrfs_fs_info {
1388         u8 fsid[BTRFS_FSID_SIZE];
1389         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1390         struct btrfs_root *extent_root;
1391         struct btrfs_root *tree_root;
1392         struct btrfs_root *chunk_root;
1393         struct btrfs_root *dev_root;
1394         struct btrfs_root *fs_root;
1395         struct btrfs_root *csum_root;
1396         struct btrfs_root *quota_root;
1397         struct btrfs_root *uuid_root;
1398 
1399         /* the log root tree is a directory of all the other log roots */
1400         struct btrfs_root *log_root_tree;
1401 
1402         spinlock_t fs_roots_radix_lock;
1403         struct radix_tree_root fs_roots_radix;
1404 
1405         /* block group cache stuff */
1406         spinlock_t block_group_cache_lock;
1407         u64 first_logical_byte;
1408         struct rb_root block_group_cache_tree;
1409 
1410         /* keep track of unallocated space */
1411         spinlock_t free_chunk_lock;
1412         u64 free_chunk_space;
1413 
1414         struct extent_io_tree freed_extents[2];
1415         struct extent_io_tree *pinned_extents;
1416 
1417         /* logical->physical extent mapping */
1418         struct btrfs_mapping_tree mapping_tree;
1419 
1420         /*
1421          * block reservation for extent, checksum, root tree and
1422          * delayed dir index item
1423          */
1424         struct btrfs_block_rsv global_block_rsv;
1425         /* block reservation for delay allocation */
1426         struct btrfs_block_rsv delalloc_block_rsv;
1427         /* block reservation for metadata operations */
1428         struct btrfs_block_rsv trans_block_rsv;
1429         /* block reservation for chunk tree */
1430         struct btrfs_block_rsv chunk_block_rsv;
1431         /* block reservation for delayed operations */
1432         struct btrfs_block_rsv delayed_block_rsv;
1433 
1434         struct btrfs_block_rsv empty_block_rsv;
1435 
1436         u64 generation;
1437         u64 last_trans_committed;
1438         u64 avg_delayed_ref_runtime;
1439 
1440         /*
1441          * this is updated to the current trans every time a full commit
1442          * is required instead of the faster short fsync log commits
1443          */
1444         u64 last_trans_log_full_commit;
1445         unsigned long mount_opt;
1446         /*
1447          * Track requests for actions that need to be done during transaction
1448          * commit (like for some mount options).
1449          */
1450         unsigned long pending_changes;
1451         unsigned long compress_type:4;
1452         int commit_interval;
1453         /*
1454          * It is a suggestive number, the read side is safe even it gets a
1455          * wrong number because we will write out the data into a regular
1456          * extent. The write side(mount/remount) is under ->s_umount lock,
1457          * so it is also safe.
1458          */
1459         u64 max_inline;
1460         /*
1461          * Protected by ->chunk_mutex and sb->s_umount.
1462          *
1463          * The reason that we use two lock to protect it is because only
1464          * remount and mount operations can change it and these two operations
1465          * are under sb->s_umount, but the read side (chunk allocation) can not
1466          * acquire sb->s_umount or the deadlock would happen. So we use two
1467          * locks to protect it. On the write side, we must acquire two locks,
1468          * and on the read side, we just need acquire one of them.
1469          */
1470         u64 alloc_start;
1471         struct btrfs_transaction *running_transaction;
1472         wait_queue_head_t transaction_throttle;
1473         wait_queue_head_t transaction_wait;
1474         wait_queue_head_t transaction_blocked_wait;
1475         wait_queue_head_t async_submit_wait;
1476 
1477         /*
1478          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
1479          * when they are updated.
1480          *
1481          * Because we do not clear the flags for ever, so we needn't use
1482          * the lock on the read side.
1483          *
1484          * We also needn't use the lock when we mount the fs, because
1485          * there is no other task which will update the flag.
1486          */
1487         spinlock_t super_lock;
1488         struct btrfs_super_block *super_copy;
1489         struct btrfs_super_block *super_for_commit;
1490         struct block_device *__bdev;
1491         struct super_block *sb;
1492         struct inode *btree_inode;
1493         struct backing_dev_info bdi;
1494         struct mutex tree_log_mutex;
1495         struct mutex transaction_kthread_mutex;
1496         struct mutex cleaner_mutex;
1497         struct mutex chunk_mutex;
1498         struct mutex volume_mutex;
1499 
1500         /*
1501          * this is taken to make sure we don't set block groups ro after
1502          * the free space cache has been allocated on them
1503          */
1504         struct mutex ro_block_group_mutex;
1505 
1506         /* this is used during read/modify/write to make sure
1507          * no two ios are trying to mod the same stripe at the same
1508          * time
1509          */
1510         struct btrfs_stripe_hash_table *stripe_hash_table;
1511 
1512         /*
1513          * this protects the ordered operations list only while we are
1514          * processing all of the entries on it.  This way we make
1515          * sure the commit code doesn't find the list temporarily empty
1516          * because another function happens to be doing non-waiting preflush
1517          * before jumping into the main commit.
1518          */
1519         struct mutex ordered_operations_mutex;
1520 
1521         struct rw_semaphore commit_root_sem;
1522 
1523         struct rw_semaphore cleanup_work_sem;
1524 
1525         struct rw_semaphore subvol_sem;
1526         struct srcu_struct subvol_srcu;
1527 
1528         spinlock_t trans_lock;
1529         /*
1530          * the reloc mutex goes with the trans lock, it is taken
1531          * during commit to protect us from the relocation code
1532          */
1533         struct mutex reloc_mutex;
1534 
1535         struct list_head trans_list;
1536         struct list_head dead_roots;
1537         struct list_head caching_block_groups;
1538 
1539         spinlock_t delayed_iput_lock;
1540         struct list_head delayed_iputs;
1541         struct rw_semaphore delayed_iput_sem;
1542 
1543         /* this protects tree_mod_seq_list */
1544         spinlock_t tree_mod_seq_lock;
1545         atomic64_t tree_mod_seq;
1546         struct list_head tree_mod_seq_list;
1547 
1548         /* this protects tree_mod_log */
1549         rwlock_t tree_mod_log_lock;
1550         struct rb_root tree_mod_log;
1551 
1552         atomic_t nr_async_submits;
1553         atomic_t async_submit_draining;
1554         atomic_t nr_async_bios;
1555         atomic_t async_delalloc_pages;
1556         atomic_t open_ioctl_trans;
1557 
1558         /*
1559          * this is used to protect the following list -- ordered_roots.
1560          */
1561         spinlock_t ordered_root_lock;
1562 
1563         /*
1564          * all fs/file tree roots in which there are data=ordered extents
1565          * pending writeback are added into this list.
1566          *
1567          * these can span multiple transactions and basically include
1568          * every dirty data page that isn't from nodatacow
1569          */
1570         struct list_head ordered_roots;
1571 
1572         struct mutex delalloc_root_mutex;
1573         spinlock_t delalloc_root_lock;
1574         /* all fs/file tree roots that have delalloc inodes. */
1575         struct list_head delalloc_roots;
1576 
1577         /*
1578          * there is a pool of worker threads for checksumming during writes
1579          * and a pool for checksumming after reads.  This is because readers
1580          * can run with FS locks held, and the writers may be waiting for
1581          * those locks.  We don't want ordering in the pending list to cause
1582          * deadlocks, and so the two are serviced separately.
1583          *
1584          * A third pool does submit_bio to avoid deadlocking with the other
1585          * two
1586          */
1587         struct btrfs_workqueue *workers;
1588         struct btrfs_workqueue *delalloc_workers;
1589         struct btrfs_workqueue *flush_workers;
1590         struct btrfs_workqueue *endio_workers;
1591         struct btrfs_workqueue *endio_meta_workers;
1592         struct btrfs_workqueue *endio_raid56_workers;
1593         struct btrfs_workqueue *endio_repair_workers;
1594         struct btrfs_workqueue *rmw_workers;
1595         struct btrfs_workqueue *endio_meta_write_workers;
1596         struct btrfs_workqueue *endio_write_workers;
1597         struct btrfs_workqueue *endio_freespace_worker;
1598         struct btrfs_workqueue *submit_workers;
1599         struct btrfs_workqueue *caching_workers;
1600         struct btrfs_workqueue *readahead_workers;
1601 
1602         /*
1603          * fixup workers take dirty pages that didn't properly go through
1604          * the cow mechanism and make them safe to write.  It happens
1605          * for the sys_munmap function call path
1606          */
1607         struct btrfs_workqueue *fixup_workers;
1608         struct btrfs_workqueue *delayed_workers;
1609 
1610         /* the extent workers do delayed refs on the extent allocation tree */
1611         struct btrfs_workqueue *extent_workers;
1612         struct task_struct *transaction_kthread;
1613         struct task_struct *cleaner_kthread;
1614         int thread_pool_size;
1615 
1616         struct kobject *space_info_kobj;
1617         int do_barriers;
1618         int closing;
1619         int log_root_recovering;
1620         int open;
1621 
1622         u64 total_pinned;
1623 
1624         /* used to keep from writing metadata until there is a nice batch */
1625         struct percpu_counter dirty_metadata_bytes;
1626         struct percpu_counter delalloc_bytes;
1627         s32 dirty_metadata_batch;
1628         s32 delalloc_batch;
1629 
1630         struct list_head dirty_cowonly_roots;
1631 
1632         struct btrfs_fs_devices *fs_devices;
1633 
1634         /*
1635          * the space_info list is almost entirely read only.  It only changes
1636          * when we add a new raid type to the FS, and that happens
1637          * very rarely.  RCU is used to protect it.
1638          */
1639         struct list_head space_info;
1640 
1641         struct btrfs_space_info *data_sinfo;
1642 
1643         struct reloc_control *reloc_ctl;
1644 
1645         /* data_alloc_cluster is only used in ssd mode */
1646         struct btrfs_free_cluster data_alloc_cluster;
1647 
1648         /* all metadata allocations go through this cluster */
1649         struct btrfs_free_cluster meta_alloc_cluster;
1650 
1651         /* auto defrag inodes go here */
1652         spinlock_t defrag_inodes_lock;
1653         struct rb_root defrag_inodes;
1654         atomic_t defrag_running;
1655 
1656         /* Used to protect avail_{data, metadata, system}_alloc_bits */
1657         seqlock_t profiles_lock;
1658         /*
1659          * these three are in extended format (availability of single
1660          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1661          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1662          */
1663         u64 avail_data_alloc_bits;
1664         u64 avail_metadata_alloc_bits;
1665         u64 avail_system_alloc_bits;
1666 
1667         /* restriper state */
1668         spinlock_t balance_lock;
1669         struct mutex balance_mutex;
1670         atomic_t balance_running;
1671         atomic_t balance_pause_req;
1672         atomic_t balance_cancel_req;
1673         struct btrfs_balance_control *balance_ctl;
1674         wait_queue_head_t balance_wait_q;
1675 
1676         unsigned data_chunk_allocations;
1677         unsigned metadata_ratio;
1678 
1679         void *bdev_holder;
1680 
1681         /* private scrub information */
1682         struct mutex scrub_lock;
1683         atomic_t scrubs_running;
1684         atomic_t scrub_pause_req;
1685         atomic_t scrubs_paused;
1686         atomic_t scrub_cancel_req;
1687         wait_queue_head_t scrub_pause_wait;
1688         int scrub_workers_refcnt;
1689         struct btrfs_workqueue *scrub_workers;
1690         struct btrfs_workqueue *scrub_wr_completion_workers;
1691         struct btrfs_workqueue *scrub_nocow_workers;
1692         struct btrfs_workqueue *scrub_parity_workers;
1693 
1694 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1695         u32 check_integrity_print_mask;
1696 #endif
1697         /*
1698          * quota information
1699          */
1700         unsigned int quota_enabled:1;
1701 
1702         /*
1703          * quota_enabled only changes state after a commit. This holds the
1704          * next state.
1705          */
1706         unsigned int pending_quota_state:1;
1707 
1708         /* is qgroup tracking in a consistent state? */
1709         u64 qgroup_flags;
1710 
1711         /* holds configuration and tracking. Protected by qgroup_lock */
1712         struct rb_root qgroup_tree;
1713         struct rb_root qgroup_op_tree;
1714         spinlock_t qgroup_lock;
1715         spinlock_t qgroup_op_lock;
1716         atomic_t qgroup_op_seq;
1717 
1718         /*
1719          * used to avoid frequently calling ulist_alloc()/ulist_free()
1720          * when doing qgroup accounting, it must be protected by qgroup_lock.
1721          */
1722         struct ulist *qgroup_ulist;
1723 
1724         /* protect user change for quota operations */
1725         struct mutex qgroup_ioctl_lock;
1726 
1727         /* list of dirty qgroups to be written at next commit */
1728         struct list_head dirty_qgroups;
1729 
1730         /* used by qgroup for an efficient tree traversal */
1731         u64 qgroup_seq;
1732 
1733         /* qgroup rescan items */
1734         struct mutex qgroup_rescan_lock; /* protects the progress item */
1735         struct btrfs_key qgroup_rescan_progress;
1736         struct btrfs_workqueue *qgroup_rescan_workers;
1737         struct completion qgroup_rescan_completion;
1738         struct btrfs_work qgroup_rescan_work;
1739 
1740         /* filesystem state */
1741         unsigned long fs_state;
1742 
1743         struct btrfs_delayed_root *delayed_root;
1744 
1745         /* readahead tree */
1746         spinlock_t reada_lock;
1747         struct radix_tree_root reada_tree;
1748 
1749         /* Extent buffer radix tree */
1750         spinlock_t buffer_lock;
1751         struct radix_tree_root buffer_radix;
1752 
1753         /* next backup root to be overwritten */
1754         int backup_root_index;
1755 
1756         int num_tolerated_disk_barrier_failures;
1757 
1758         /* device replace state */
1759         struct btrfs_dev_replace dev_replace;
1760 
1761         atomic_t mutually_exclusive_operation_running;
1762 
1763         struct percpu_counter bio_counter;
1764         wait_queue_head_t replace_wait;
1765 
1766         struct semaphore uuid_tree_rescan_sem;
1767         unsigned int update_uuid_tree_gen:1;
1768 
1769         /* Used to reclaim the metadata space in the background. */
1770         struct work_struct async_reclaim_work;
1771 
1772         spinlock_t unused_bgs_lock;
1773         struct list_head unused_bgs;
1774         struct mutex unused_bg_unpin_mutex;
1775         struct mutex delete_unused_bgs_mutex;
1776 
1777         /* For btrfs to record security options */
1778         struct security_mnt_opts security_opts;
1779 
1780         /*
1781          * Chunks that can't be freed yet (under a trim/discard operation)
1782          * and will be latter freed. Protected by fs_info->chunk_mutex.
1783          */
1784         struct list_head pinned_chunks;
1785 };
1786 
1787 struct btrfs_subvolume_writers {
1788         struct percpu_counter   counter;
1789         wait_queue_head_t       wait;
1790 };
1791 
1792 /*
1793  * The state of btrfs root
1794  */
1795 /*
1796  * btrfs_record_root_in_trans is a multi-step process,
1797  * and it can race with the balancing code.   But the
1798  * race is very small, and only the first time the root
1799  * is added to each transaction.  So IN_TRANS_SETUP
1800  * is used to tell us when more checks are required
1801  */
1802 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1803 #define BTRFS_ROOT_REF_COWS             1
1804 #define BTRFS_ROOT_TRACK_DIRTY          2
1805 #define BTRFS_ROOT_IN_RADIX             3
1806 #define BTRFS_ROOT_DUMMY_ROOT           4
1807 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 5
1808 #define BTRFS_ROOT_DEFRAG_RUNNING       6
1809 #define BTRFS_ROOT_FORCE_COW            7
1810 #define BTRFS_ROOT_MULTI_LOG_TASKS      8
1811 #define BTRFS_ROOT_DIRTY                9
1812 
1813 /*
1814  * in ram representation of the tree.  extent_root is used for all allocations
1815  * and for the extent tree extent_root root.
1816  */
1817 struct btrfs_root {
1818         struct extent_buffer *node;
1819 
1820         struct extent_buffer *commit_root;
1821         struct btrfs_root *log_root;
1822         struct btrfs_root *reloc_root;
1823 
1824         unsigned long state;
1825         struct btrfs_root_item root_item;
1826         struct btrfs_key root_key;
1827         struct btrfs_fs_info *fs_info;
1828         struct extent_io_tree dirty_log_pages;
1829 
1830         struct mutex objectid_mutex;
1831 
1832         spinlock_t accounting_lock;
1833         struct btrfs_block_rsv *block_rsv;
1834 
1835         /* free ino cache stuff */
1836         struct btrfs_free_space_ctl *free_ino_ctl;
1837         enum btrfs_caching_type ino_cache_state;
1838         spinlock_t ino_cache_lock;
1839         wait_queue_head_t ino_cache_wait;
1840         struct btrfs_free_space_ctl *free_ino_pinned;
1841         u64 ino_cache_progress;
1842         struct inode *ino_cache_inode;
1843 
1844         struct mutex log_mutex;
1845         wait_queue_head_t log_writer_wait;
1846         wait_queue_head_t log_commit_wait[2];
1847         struct list_head log_ctxs[2];
1848         atomic_t log_writers;
1849         atomic_t log_commit[2];
1850         atomic_t log_batch;
1851         int log_transid;
1852         /* No matter the commit succeeds or not*/
1853         int log_transid_committed;
1854         /* Just be updated when the commit succeeds. */
1855         int last_log_commit;
1856         pid_t log_start_pid;
1857 
1858         u64 objectid;
1859         u64 last_trans;
1860 
1861         /* data allocations are done in sectorsize units */
1862         u32 sectorsize;
1863 
1864         /* node allocations are done in nodesize units */
1865         u32 nodesize;
1866 
1867         u32 stripesize;
1868 
1869         u32 type;
1870 
1871         u64 highest_objectid;
1872 
1873         /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1874         u64 alloc_bytenr;
1875 
1876         u64 defrag_trans_start;
1877         struct btrfs_key defrag_progress;
1878         struct btrfs_key defrag_max;
1879         char *name;
1880 
1881         /* the dirty list is only used by non-reference counted roots */
1882         struct list_head dirty_list;
1883 
1884         struct list_head root_list;
1885 
1886         spinlock_t log_extents_lock[2];
1887         struct list_head logged_list[2];
1888 
1889         spinlock_t orphan_lock;
1890         atomic_t orphan_inodes;
1891         struct btrfs_block_rsv *orphan_block_rsv;
1892         int orphan_cleanup_state;
1893 
1894         spinlock_t inode_lock;
1895         /* red-black tree that keeps track of in-memory inodes */
1896         struct rb_root inode_tree;
1897 
1898         /*
1899          * radix tree that keeps track of delayed nodes of every inode,
1900          * protected by inode_lock
1901          */
1902         struct radix_tree_root delayed_nodes_tree;
1903         /*
1904          * right now this just gets used so that a root has its own devid
1905          * for stat.  It may be used for more later
1906          */
1907         dev_t anon_dev;
1908 
1909         spinlock_t root_item_lock;
1910         atomic_t refs;
1911 
1912         struct mutex delalloc_mutex;
1913         spinlock_t delalloc_lock;
1914         /*
1915          * all of the inodes that have delalloc bytes.  It is possible for
1916          * this list to be empty even when there is still dirty data=ordered
1917          * extents waiting to finish IO.
1918          */
1919         struct list_head delalloc_inodes;
1920         struct list_head delalloc_root;
1921         u64 nr_delalloc_inodes;
1922 
1923         struct mutex ordered_extent_mutex;
1924         /*
1925          * this is used by the balancing code to wait for all the pending
1926          * ordered extents
1927          */
1928         spinlock_t ordered_extent_lock;
1929 
1930         /*
1931          * all of the data=ordered extents pending writeback
1932          * these can span multiple transactions and basically include
1933          * every dirty data page that isn't from nodatacow
1934          */
1935         struct list_head ordered_extents;
1936         struct list_head ordered_root;
1937         u64 nr_ordered_extents;
1938 
1939         /*
1940          * Number of currently running SEND ioctls to prevent
1941          * manipulation with the read-only status via SUBVOL_SETFLAGS
1942          */
1943         int send_in_progress;
1944         struct btrfs_subvolume_writers *subv_writers;
1945         atomic_t will_be_snapshoted;
1946 };
1947 
1948 struct btrfs_ioctl_defrag_range_args {
1949         /* start of the defrag operation */
1950         __u64 start;
1951 
1952         /* number of bytes to defrag, use (u64)-1 to say all */
1953         __u64 len;
1954 
1955         /*
1956          * flags for the operation, which can include turning
1957          * on compression for this one defrag
1958          */
1959         __u64 flags;
1960 
1961         /*
1962          * any extent bigger than this will be considered
1963          * already defragged.  Use 0 to take the kernel default
1964          * Use 1 to say every single extent must be rewritten
1965          */
1966         __u32 extent_thresh;
1967 
1968         /*
1969          * which compression method to use if turning on compression
1970          * for this defrag operation.  If unspecified, zlib will
1971          * be used
1972          */
1973         __u32 compress_type;
1974 
1975         /* spare for later */
1976         __u32 unused[4];
1977 };
1978 
1979 
1980 /*
1981  * inode items have the data typically returned from stat and store other
1982  * info about object characteristics.  There is one for every file and dir in
1983  * the FS
1984  */
1985 #define BTRFS_INODE_ITEM_KEY            1
1986 #define BTRFS_INODE_REF_KEY             12
1987 #define BTRFS_INODE_EXTREF_KEY          13
1988 #define BTRFS_XATTR_ITEM_KEY            24
1989 #define BTRFS_ORPHAN_ITEM_KEY           48
1990 /* reserve 2-15 close to the inode for later flexibility */
1991 
1992 /*
1993  * dir items are the name -> inode pointers in a directory.  There is one
1994  * for every name in a directory.
1995  */
1996 #define BTRFS_DIR_LOG_ITEM_KEY  60
1997 #define BTRFS_DIR_LOG_INDEX_KEY 72
1998 #define BTRFS_DIR_ITEM_KEY      84
1999 #define BTRFS_DIR_INDEX_KEY     96
2000 /*
2001  * extent data is for file data
2002  */
2003 #define BTRFS_EXTENT_DATA_KEY   108
2004 
2005 /*
2006  * extent csums are stored in a separate tree and hold csums for
2007  * an entire extent on disk.
2008  */
2009 #define BTRFS_EXTENT_CSUM_KEY   128
2010 
2011 /*
2012  * root items point to tree roots.  They are typically in the root
2013  * tree used by the super block to find all the other trees
2014  */
2015 #define BTRFS_ROOT_ITEM_KEY     132
2016 
2017 /*
2018  * root backrefs tie subvols and snapshots to the directory entries that
2019  * reference them
2020  */
2021 #define BTRFS_ROOT_BACKREF_KEY  144
2022 
2023 /*
2024  * root refs make a fast index for listing all of the snapshots and
2025  * subvolumes referenced by a given root.  They point directly to the
2026  * directory item in the root that references the subvol
2027  */
2028 #define BTRFS_ROOT_REF_KEY      156
2029 
2030 /*
2031  * extent items are in the extent map tree.  These record which blocks
2032  * are used, and how many references there are to each block
2033  */
2034 #define BTRFS_EXTENT_ITEM_KEY   168
2035 
2036 /*
2037  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
2038  * the length, so we save the level in key->offset instead of the length.
2039  */
2040 #define BTRFS_METADATA_ITEM_KEY 169
2041 
2042 #define BTRFS_TREE_BLOCK_REF_KEY        176
2043 
2044 #define BTRFS_EXTENT_DATA_REF_KEY       178
2045 
2046 #define BTRFS_EXTENT_REF_V0_KEY         180
2047 
2048 #define BTRFS_SHARED_BLOCK_REF_KEY      182
2049 
2050 #define BTRFS_SHARED_DATA_REF_KEY       184
2051 
2052 /*
2053  * block groups give us hints into the extent allocation trees.  Which
2054  * blocks are free etc etc
2055  */
2056 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
2057 
2058 #define BTRFS_DEV_EXTENT_KEY    204
2059 #define BTRFS_DEV_ITEM_KEY      216
2060 #define BTRFS_CHUNK_ITEM_KEY    228
2061 
2062 /*
2063  * Records the overall state of the qgroups.
2064  * There's only one instance of this key present,
2065  * (0, BTRFS_QGROUP_STATUS_KEY, 0)
2066  */
2067 #define BTRFS_QGROUP_STATUS_KEY         240
2068 /*
2069  * Records the currently used space of the qgroup.
2070  * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
2071  */
2072 #define BTRFS_QGROUP_INFO_KEY           242
2073 /*
2074  * Contains the user configured limits for the qgroup.
2075  * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
2076  */
2077 #define BTRFS_QGROUP_LIMIT_KEY          244
2078 /*
2079  * Records the child-parent relationship of qgroups. For
2080  * each relation, 2 keys are present:
2081  * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
2082  * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
2083  */
2084 #define BTRFS_QGROUP_RELATION_KEY       246
2085 
2086 #define BTRFS_BALANCE_ITEM_KEY  248
2087 
2088 /*
2089  * Persistantly stores the io stats in the device tree.
2090  * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
2091  */
2092 #define BTRFS_DEV_STATS_KEY     249
2093 
2094 /*
2095  * Persistantly stores the device replace state in the device tree.
2096  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
2097  */
2098 #define BTRFS_DEV_REPLACE_KEY   250
2099 
2100 /*
2101  * Stores items that allow to quickly map UUIDs to something else.
2102  * These items are part of the filesystem UUID tree.
2103  * The key is built like this:
2104  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
2105  */
2106 #if BTRFS_UUID_SIZE != 16
2107 #error "UUID items require BTRFS_UUID_SIZE == 16!"
2108 #endif
2109 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
2110 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
2111                                                  * received subvols */
2112 
2113 /*
2114  * string items are for debugging.  They just store a short string of
2115  * data in the FS
2116  */
2117 #define BTRFS_STRING_ITEM_KEY   253
2118 
2119 /*
2120  * Flags for mount options.
2121  *
2122  * Note: don't forget to add new options to btrfs_show_options()
2123  */
2124 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
2125 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
2126 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
2127 #define BTRFS_MOUNT_SSD                 (1 << 3)
2128 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
2129 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
2130 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
2131 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
2132 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
2133 #define BTRFS_MOUNT_NOSSD               (1 << 9)
2134 #define BTRFS_MOUNT_DISCARD             (1 << 10)
2135 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
2136 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
2137 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
2138 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
2139 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
2140 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
2141 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
2142 #define BTRFS_MOUNT_RECOVERY            (1 << 18)
2143 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
2144 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
2145 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
2146 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
2147 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
2148 
2149 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
2150 #define BTRFS_DEFAULT_MAX_INLINE        (8192)
2151 
2152 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
2153 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
2154 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
2155 #define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
2156                                          BTRFS_MOUNT_##opt)
2157 
2158 #define btrfs_set_and_info(root, opt, fmt, args...)                     \
2159 {                                                                       \
2160         if (!btrfs_test_opt(root, opt))                                 \
2161                 btrfs_info(root->fs_info, fmt, ##args);                 \
2162         btrfs_set_opt(root->fs_info->mount_opt, opt);                   \
2163 }
2164 
2165 #define btrfs_clear_and_info(root, opt, fmt, args...)                   \
2166 {                                                                       \
2167         if (btrfs_test_opt(root, opt))                                  \
2168                 btrfs_info(root->fs_info, fmt, ##args);                 \
2169         btrfs_clear_opt(root->fs_info->mount_opt, opt);                 \
2170 }
2171 
2172 /*
2173  * Requests for changes that need to be done during transaction commit.
2174  *
2175  * Internal mount options that are used for special handling of the real
2176  * mount options (eg. cannot be set during remount and have to be set during
2177  * transaction commit)
2178  */
2179 
2180 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
2181 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
2182 #define BTRFS_PENDING_COMMIT                    (2)
2183 
2184 #define btrfs_test_pending(info, opt)   \
2185         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
2186 #define btrfs_set_pending(info, opt)    \
2187         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
2188 #define btrfs_clear_pending(info, opt)  \
2189         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
2190 
2191 /*
2192  * Helpers for setting pending mount option changes.
2193  *
2194  * Expects corresponding macros
2195  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
2196  */
2197 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
2198 do {                                                                   \
2199        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
2200                btrfs_info((info), fmt, ##args);                        \
2201                btrfs_set_pending((info), SET_##opt);                   \
2202                btrfs_clear_pending((info), CLEAR_##opt);               \
2203        }                                                               \
2204 } while(0)
2205 
2206 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
2207 do {                                                                   \
2208        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
2209                btrfs_info((info), fmt, ##args);                        \
2210                btrfs_set_pending((info), CLEAR_##opt);                 \
2211                btrfs_clear_pending((info), SET_##opt);                 \
2212        }                                                               \
2213 } while(0)
2214 
2215 /*
2216  * Inode flags
2217  */
2218 #define BTRFS_INODE_NODATASUM           (1 << 0)
2219 #define BTRFS_INODE_NODATACOW           (1 << 1)
2220 #define BTRFS_INODE_READONLY            (1 << 2)
2221 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
2222 #define BTRFS_INODE_PREALLOC            (1 << 4)
2223 #define BTRFS_INODE_SYNC                (1 << 5)
2224 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
2225 #define BTRFS_INODE_APPEND              (1 << 7)
2226 #define BTRFS_INODE_NODUMP              (1 << 8)
2227 #define BTRFS_INODE_NOATIME             (1 << 9)
2228 #define BTRFS_INODE_DIRSYNC             (1 << 10)
2229 #define BTRFS_INODE_COMPRESS            (1 << 11)
2230 
2231 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
2232 
2233 struct btrfs_map_token {
2234         struct extent_buffer *eb;
2235         char *kaddr;
2236         unsigned long offset;
2237 };
2238 
2239 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
2240 {
2241         token->kaddr = NULL;
2242 }
2243 
2244 /* some macros to generate set/get funcs for the struct fields.  This
2245  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
2246  * one for u8:
2247  */
2248 #define le8_to_cpu(v) (v)
2249 #define cpu_to_le8(v) (v)
2250 #define __le8 u8
2251 
2252 #define read_eb_member(eb, ptr, type, member, result) (                 \
2253         read_extent_buffer(eb, (char *)(result),                        \
2254                            ((unsigned long)(ptr)) +                     \
2255                             offsetof(type, member),                     \
2256                            sizeof(((type *)0)->member)))
2257 
2258 #define write_eb_member(eb, ptr, type, member, result) (                \
2259         write_extent_buffer(eb, (char *)(result),                       \
2260                            ((unsigned long)(ptr)) +                     \
2261                             offsetof(type, member),                     \
2262                            sizeof(((type *)0)->member)))
2263 
2264 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
2265 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,     \
2266                                unsigned long off,                       \
2267                               struct btrfs_map_token *token);           \
2268 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,        \
2269                             unsigned long off, u##bits val,             \
2270                             struct btrfs_map_token *token);             \
2271 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
2272                                        unsigned long off)               \
2273 {                                                                       \
2274         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
2275 }                                                                       \
2276 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
2277                                     unsigned long off, u##bits val)     \
2278 {                                                                       \
2279        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
2280 }
2281 
2282 DECLARE_BTRFS_SETGET_BITS(8)
2283 DECLARE_BTRFS_SETGET_BITS(16)
2284 DECLARE_BTRFS_SETGET_BITS(32)
2285 DECLARE_BTRFS_SETGET_BITS(64)
2286 
2287 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
2288 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)   \
2289 {                                                                       \
2290         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
2291         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
2292 }                                                                       \
2293 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
2294                                     u##bits val)                        \
2295 {                                                                       \
2296         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
2297         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
2298 }                                                                       \
2299 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
2300                                          struct btrfs_map_token *token) \
2301 {                                                                       \
2302         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
2303         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
2304 }                                                                       \
2305 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
2306                                           type *s, u##bits val,         \
2307                                          struct btrfs_map_token *token) \
2308 {                                                                       \
2309         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
2310         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
2311 }
2312 
2313 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
2314 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
2315 {                                                                       \
2316         type *p = page_address(eb->pages[0]);                           \
2317         u##bits res = le##bits##_to_cpu(p->member);                     \
2318         return res;                                                     \
2319 }                                                                       \
2320 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
2321                                     u##bits val)                        \
2322 {                                                                       \
2323         type *p = page_address(eb->pages[0]);                           \
2324         p->member = cpu_to_le##bits(val);                               \
2325 }
2326 
2327 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
2328 static inline u##bits btrfs_##name(type *s)                             \
2329 {                                                                       \
2330         return le##bits##_to_cpu(s->member);                            \
2331 }                                                                       \
2332 static inline void btrfs_set_##name(type *s, u##bits val)               \
2333 {                                                                       \
2334         s->member = cpu_to_le##bits(val);                               \
2335 }
2336 
2337 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
2338 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
2339 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
2340 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
2341 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
2342 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
2343                    start_offset, 64);
2344 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
2345 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
2346 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
2347 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
2348 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
2349 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
2350 
2351 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
2352 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
2353                          total_bytes, 64);
2354 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
2355                          bytes_used, 64);
2356 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
2357                          io_align, 32);
2358 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
2359                          io_width, 32);
2360 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
2361                          sector_size, 32);
2362 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
2363 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
2364                          dev_group, 32);
2365 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
2366                          seek_speed, 8);
2367 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
2368                          bandwidth, 8);
2369 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
2370                          generation, 64);
2371 
2372 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
2373 {
2374         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
2375 }
2376 
2377 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
2378 {
2379         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
2380 }
2381 
2382 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2383 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
2384 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
2385 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
2386 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
2387 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
2388 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
2389 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
2390 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
2391 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
2392 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
2393 
2394 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
2395 {
2396         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
2397 }
2398 
2399 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
2400 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
2401 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
2402                          stripe_len, 64);
2403 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
2404                          io_align, 32);
2405 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
2406                          io_width, 32);
2407 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
2408                          sector_size, 32);
2409 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
2410 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
2411                          num_stripes, 16);
2412 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
2413                          sub_stripes, 16);
2414 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
2415 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
2416 
2417 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
2418                                                    int nr)
2419 {
2420         unsigned long offset = (unsigned long)c;
2421         offset += offsetof(struct btrfs_chunk, stripe);
2422         offset += nr * sizeof(struct btrfs_stripe);
2423         return (struct btrfs_stripe *)offset;
2424 }
2425 
2426 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
2427 {
2428         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
2429 }
2430 
2431 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
2432                                          struct btrfs_chunk *c, int nr)
2433 {
2434         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
2435 }
2436 
2437 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
2438                                          struct btrfs_chunk *c, int nr)
2439 {
2440         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
2441 }
2442 
2443 /* struct btrfs_block_group_item */
2444 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
2445                          used, 64);
2446 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
2447                          used, 64);
2448 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
2449                         struct btrfs_block_group_item, chunk_objectid, 64);
2450 
2451 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2452                    struct btrfs_block_group_item, chunk_objectid, 64);
2453 BTRFS_SETGET_FUNCS(disk_block_group_flags,
2454                    struct btrfs_block_group_item, flags, 64);
2455 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
2456                         struct btrfs_block_group_item, flags, 64);
2457 
2458 /* struct btrfs_inode_ref */
2459 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2460 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2461 
2462 /* struct btrfs_inode_extref */
2463 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
2464                    parent_objectid, 64);
2465 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
2466                    name_len, 16);
2467 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
2468 
2469 /* struct btrfs_inode_item */
2470 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2471 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2472 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2473 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2474 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2475 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
2476 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
2477 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
2478 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
2479 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
2480 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2481 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2482 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
2483                          generation, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
2485                          sequence, 64);
2486 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
2487                          transid, 64);
2488 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
2489 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
2490                          nbytes, 64);
2491 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
2492                          block_group, 64);
2493 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
2494 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
2495 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
2496 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
2497 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
2498 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
2499 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2500 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2501 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
2502 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
2503 
2504 /* struct btrfs_dev_extent */
2505 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2506                    chunk_tree, 64);
2507 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2508                    chunk_objectid, 64);
2509 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2510                    chunk_offset, 64);
2511 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2512 
2513 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2514 {
2515         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2516         return (unsigned long)dev + ptr;
2517 }
2518 
2519 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2520 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2521                    generation, 64);
2522 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2523 
2524 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2525 
2526 
2527 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2528 
2529 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2530                                         struct btrfs_tree_block_info *item,
2531                                         struct btrfs_disk_key *key)
2532 {
2533         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2534 }
2535 
2536 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2537                                             struct btrfs_tree_block_info *item,
2538                                             struct btrfs_disk_key *key)
2539 {
2540         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2541 }
2542 
2543 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2544                    root, 64);
2545 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2546                    objectid, 64);
2547 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2548                    offset, 64);
2549 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2550                    count, 32);
2551 
2552 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2553                    count, 32);
2554 
2555 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2556                    type, 8);
2557 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2558                    offset, 64);
2559 
2560 static inline u32 btrfs_extent_inline_ref_size(int type)
2561 {
2562         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2563             type == BTRFS_SHARED_BLOCK_REF_KEY)
2564                 return sizeof(struct btrfs_extent_inline_ref);
2565         if (type == BTRFS_SHARED_DATA_REF_KEY)
2566                 return sizeof(struct btrfs_shared_data_ref) +
2567                        sizeof(struct btrfs_extent_inline_ref);
2568         if (type == BTRFS_EXTENT_DATA_REF_KEY)
2569                 return sizeof(struct btrfs_extent_data_ref) +
2570                        offsetof(struct btrfs_extent_inline_ref, offset);
2571         BUG();
2572         return 0;
2573 }
2574 
2575 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2576 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2577                    generation, 64);
2578 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2579 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2580 
2581 /* struct btrfs_node */
2582 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2583 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2584 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
2585                          blockptr, 64);
2586 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
2587                          generation, 64);
2588 
2589 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2590 {
2591         unsigned long ptr;
2592         ptr = offsetof(struct btrfs_node, ptrs) +
2593                 sizeof(struct btrfs_key_ptr) * nr;
2594         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2595 }
2596 
2597 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2598                                            int nr, u64 val)
2599 {
2600         unsigned long ptr;
2601         ptr = offsetof(struct btrfs_node, ptrs) +
2602                 sizeof(struct btrfs_key_ptr) * nr;
2603         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2604 }
2605 
2606 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2607 {
2608         unsigned long ptr;
2609         ptr = offsetof(struct btrfs_node, ptrs) +
2610                 sizeof(struct btrfs_key_ptr) * nr;
2611         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2612 }
2613 
2614 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2615                                                  int nr, u64 val)
2616 {
2617         unsigned long ptr;
2618         ptr = offsetof(struct btrfs_node, ptrs) +
2619                 sizeof(struct btrfs_key_ptr) * nr;
2620         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2621 }
2622 
2623 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2624 {
2625         return offsetof(struct btrfs_node, ptrs) +
2626                 sizeof(struct btrfs_key_ptr) * nr;
2627 }
2628 
2629 void btrfs_node_key(struct extent_buffer *eb,
2630                     struct btrfs_disk_key *disk_key, int nr);
2631 
2632 static inline void btrfs_set_node_key(struct extent_buffer *eb,
2633                                       struct btrfs_disk_key *disk_key, int nr)
2634 {
2635         unsigned long ptr;
2636         ptr = btrfs_node_key_ptr_offset(nr);
2637         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2638                        struct btrfs_key_ptr, key, disk_key);
2639 }
2640 
2641 /* struct btrfs_item */
2642 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2643 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2644 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2645 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2646 
2647 static inline unsigned long btrfs_item_nr_offset(int nr)
2648 {
2649         return offsetof(struct btrfs_leaf, items) +
2650                 sizeof(struct btrfs_item) * nr;
2651 }
2652 
2653 static inline struct btrfs_item *btrfs_item_nr(int nr)
2654 {
2655         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2656 }
2657 
2658 static inline u32 btrfs_item_end(struct extent_buffer *eb,
2659                                  struct btrfs_item *item)
2660 {
2661         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2662 }
2663 
2664 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2665 {
2666         return btrfs_item_end(eb, btrfs_item_nr(nr));
2667 }
2668 
2669 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2670 {
2671         return btrfs_item_offset(eb, btrfs_item_nr(nr));
2672 }
2673 
2674 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2675 {
2676         return btrfs_item_size(eb, btrfs_item_nr(nr));
2677 }
2678 
2679 static inline void btrfs_item_key(struct extent_buffer *eb,
2680                            struct btrfs_disk_key *disk_key, int nr)
2681 {
2682         struct btrfs_item *item = btrfs_item_nr(nr);
2683         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2684 }
2685 
2686 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2687                                struct btrfs_disk_key *disk_key, int nr)
2688 {
2689         struct btrfs_item *item = btrfs_item_nr(nr);
2690         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2691 }
2692 
2693 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2694 
2695 /*
2696  * struct btrfs_root_ref
2697  */
2698 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2699 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2700 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2701 
2702 /* struct btrfs_dir_item */
2703 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2704 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2705 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2706 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2707 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2708 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2709                          data_len, 16);
2710 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2711                          name_len, 16);
2712 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2713                          transid, 64);
2714 
2715 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2716                                       struct btrfs_dir_item *item,
2717                                       struct btrfs_disk_key *key)
2718 {
2719         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2720 }
2721 
2722 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2723                                           struct btrfs_dir_item *item,
2724                                           struct btrfs_disk_key *key)
2725 {
2726         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2727 }
2728 
2729 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2730                    num_entries, 64);
2731 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2732                    num_bitmaps, 64);
2733 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2734                    generation, 64);
2735 
2736 static inline void btrfs_free_space_key(struct extent_buffer *eb,
2737                                         struct btrfs_free_space_header *h,
2738                                         struct btrfs_disk_key *key)
2739 {
2740         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2741 }
2742 
2743 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2744                                             struct btrfs_free_space_header *h,
2745                                             struct btrfs_disk_key *key)
2746 {
2747         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2748 }
2749 
2750 /* struct btrfs_disk_key */
2751 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2752                          objectid, 64);
2753 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2754 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2755 
2756 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2757                                          struct btrfs_disk_key *disk)
2758 {
2759         cpu->offset = le64_to_cpu(disk->offset);
2760         cpu->type = disk->type;
2761         cpu->objectid = le64_to_cpu(disk->objectid);
2762 }
2763 
2764 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2765                                          struct btrfs_key *cpu)
2766 {
2767         disk->offset = cpu_to_le64(cpu->offset);
2768         disk->type = cpu->type;
2769         disk->objectid = cpu_to_le64(cpu->objectid);
2770 }
2771 
2772 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2773                                   struct btrfs_key *key, int nr)
2774 {
2775         struct btrfs_disk_key disk_key;
2776         btrfs_node_key(eb, &disk_key, nr);
2777         btrfs_disk_key_to_cpu(key, &disk_key);
2778 }
2779 
2780 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2781                                   struct btrfs_key *key, int nr)
2782 {
2783         struct btrfs_disk_key disk_key;
2784         btrfs_item_key(eb, &disk_key, nr);
2785         btrfs_disk_key_to_cpu(key, &disk_key);
2786 }
2787 
2788 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2789                                       struct btrfs_dir_item *item,
2790                                       struct btrfs_key *key)
2791 {
2792         struct btrfs_disk_key disk_key;
2793         btrfs_dir_item_key(eb, item, &disk_key);
2794         btrfs_disk_key_to_cpu(key, &disk_key);
2795 }
2796 
2797 
2798 static inline u8 btrfs_key_type(struct btrfs_key *key)
2799 {
2800         return key->type;
2801 }
2802 
2803 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2804 {
2805         key->type = val;
2806 }
2807 
2808 /* struct btrfs_header */
2809 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2810 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2811                           generation, 64);
2812 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2813 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2814 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2815 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2816 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2817                          generation, 64);
2818 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2819 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2820                          nritems, 32);
2821 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2822 
2823 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2824 {
2825         return (btrfs_header_flags(eb) & flag) == flag;
2826 }
2827 
2828 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2829 {
2830         u64 flags = btrfs_header_flags(eb);
2831         btrfs_set_header_flags(eb, flags | flag);
2832         return (flags & flag) == flag;
2833 }
2834 
2835 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2836 {
2837         u64 flags = btrfs_header_flags(eb);
2838         btrfs_set_header_flags(eb, flags & ~flag);
2839         return (flags & flag) == flag;
2840 }
2841 
2842 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2843 {
2844         u64 flags = btrfs_header_flags(eb);
2845         return flags >> BTRFS_BACKREF_REV_SHIFT;
2846 }
2847 
2848 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2849                                                 int rev)
2850 {
2851         u64 flags = btrfs_header_flags(eb);
2852         flags &= ~BTRFS_BACKREF_REV_MASK;
2853         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2854         btrfs_set_header_flags(eb, flags);
2855 }
2856 
2857 static inline unsigned long btrfs_header_fsid(void)
2858 {
2859         return offsetof(struct btrfs_header, fsid);
2860 }
2861 
2862 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2863 {
2864         return offsetof(struct btrfs_header, chunk_tree_uuid);
2865 }
2866 
2867 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2868 {
2869         return btrfs_header_level(eb) == 0;
2870 }
2871 
2872 /* struct btrfs_root_item */
2873 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2874                    generation, 64);
2875 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2876 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2877 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2878 
2879 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2880                          generation, 64);
2881 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2882 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2883 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2884 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2885 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2886 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2887 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2888 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2889                          last_snapshot, 64);
2890 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2891                          generation_v2, 64);
2892 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2893                          ctransid, 64);
2894 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2895                          otransid, 64);
2896 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2897                          stransid, 64);
2898 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2899                          rtransid, 64);
2900 
2901 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2902 {
2903         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2904 }
2905 
2906 static inline bool btrfs_root_dead(struct btrfs_root *root)
2907 {
2908         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2909 }
2910 
2911 /* struct btrfs_root_backup */
2912 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2913                    tree_root, 64);
2914 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2915                    tree_root_gen, 64);
2916 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2917                    tree_root_level, 8);
2918 
2919 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2920                    chunk_root, 64);
2921 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2922                    chunk_root_gen, 64);
2923 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2924                    chunk_root_level, 8);
2925 
2926 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2927                    extent_root, 64);
2928 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2929                    extent_root_gen, 64);
2930 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2931                    extent_root_level, 8);
2932 
2933 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2934                    fs_root, 64);
2935 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2936                    fs_root_gen, 64);
2937 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2938                    fs_root_level, 8);
2939 
2940 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2941                    dev_root, 64);
2942 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2943                    dev_root_gen, 64);
2944 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2945                    dev_root_level, 8);
2946 
2947 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2948                    csum_root, 64);
2949 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2950                    csum_root_gen, 64);
2951 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2952                    csum_root_level, 8);
2953 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2954                    total_bytes, 64);
2955 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2956                    bytes_used, 64);
2957 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2958                    num_devices, 64);
2959 
2960 /* struct btrfs_balance_item */
2961 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2962 
2963 static inline void btrfs_balance_data(struct extent_buffer *eb,
2964                                       struct btrfs_balance_item *bi,
2965                                       struct btrfs_disk_balance_args *ba)
2966 {
2967         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2968 }
2969 
2970 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2971                                           struct btrfs_balance_item *bi,
2972                                           struct btrfs_disk_balance_args *ba)
2973 {
2974         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2975 }
2976 
2977 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2978                                       struct btrfs_balance_item *bi,
2979                                       struct btrfs_disk_balance_args *ba)
2980 {
2981         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2982 }
2983 
2984 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2985                                           struct btrfs_balance_item *bi,
2986                                           struct btrfs_disk_balance_args *ba)
2987 {
2988         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2989 }
2990 
2991 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2992                                      struct btrfs_balance_item *bi,
2993                                      struct btrfs_disk_balance_args *ba)
2994 {
2995         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2996 }
2997 
2998 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2999                                          struct btrfs_balance_item *bi,
3000                                          struct btrfs_disk_balance_args *ba)
3001 {
3002         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
3003 }
3004 
3005 static inline void
3006 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
3007                                struct btrfs_disk_balance_args *disk)
3008 {
3009         memset(cpu, 0, sizeof(*cpu));
3010 
3011         cpu->profiles = le64_to_cpu(disk->profiles);
3012         cpu->usage = le64_to_cpu(disk->usage);
3013         cpu->devid = le64_to_cpu(disk->devid);
3014         cpu->pstart = le64_to_cpu(disk->pstart);
3015         cpu->pend = le64_to_cpu(disk->pend);
3016         cpu->vstart = le64_to_cpu(disk->vstart);
3017         cpu->vend = le64_to_cpu(disk->vend);
3018         cpu->target = le64_to_cpu(disk->target);
3019         cpu->flags = le64_to_cpu(disk->flags);
3020         cpu->limit = le64_to_cpu(disk->limit);
3021 }
3022 
3023 static inline void
3024 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
3025                                struct btrfs_balance_args *cpu)
3026 {
3027         memset(disk, 0, sizeof(*disk));
3028 
3029         disk->profiles = cpu_to_le64(cpu->profiles);
3030         disk->usage = cpu_to_le64(cpu->usage);
3031         disk->devid = cpu_to_le64(cpu->devid);
3032         disk->pstart = cpu_to_le64(cpu->pstart);
3033         disk->pend = cpu_to_le64(cpu->pend);
3034         disk->vstart = cpu_to_le64(cpu->vstart);
3035         disk->vend = cpu_to_le64(cpu->vend);
3036         disk->target = cpu_to_le64(cpu->target);
3037         disk->flags = cpu_to_le64(cpu->flags);
3038         disk->limit = cpu_to_le64(cpu->limit);
3039 }
3040 
3041 /* struct btrfs_super_block */
3042 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
3043 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
3044 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
3045                          generation, 64);
3046 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
3047 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
3048                          struct btrfs_super_block, sys_chunk_array_size, 32);
3049 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
3050                          struct btrfs_super_block, chunk_root_generation, 64);
3051 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
3052                          root_level, 8);
3053 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
3054                          chunk_root, 64);
3055 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
3056                          chunk_root_level, 8);
3057 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
3058                          log_root, 64);
3059 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
3060                          log_root_transid, 64);
3061 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
3062                          log_root_level, 8);
3063 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
3064                          total_bytes, 64);
3065 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
3066                          bytes_used, 64);
3067 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
3068                          sectorsize, 32);
3069 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
3070                          nodesize, 32);
3071 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
3072                          stripesize, 32);
3073 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
3074                          root_dir_objectid, 64);
3075 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
3076                          num_devices, 64);
3077 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
3078                          compat_flags, 64);
3079 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
3080                          compat_ro_flags, 64);
3081 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
3082                          incompat_flags, 64);
3083 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
3084                          csum_type, 16);
3085 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
3086                          cache_generation, 64);
3087 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
3088 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
3089                          uuid_tree_generation, 64);
3090 
3091 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
3092 {
3093         u16 t = btrfs_super_csum_type(s);
3094         /*
3095          * csum type is validated at mount time
3096          */
3097         return btrfs_csum_sizes[t];
3098 }
3099 
3100 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
3101 {
3102         return offsetof(struct btrfs_leaf, items);
3103 }
3104 
3105 /* struct btrfs_file_extent_item */
3106 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
3107 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
3108                          struct btrfs_file_extent_item, disk_bytenr, 64);
3109 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
3110                          struct btrfs_file_extent_item, offset, 64);
3111 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
3112                          struct btrfs_file_extent_item, generation, 64);
3113 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
3114                          struct btrfs_file_extent_item, num_bytes, 64);
3115 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
3116                          struct btrfs_file_extent_item, disk_num_bytes, 64);
3117 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
3118                          struct btrfs_file_extent_item, compression, 8);
3119 
3120 static inline unsigned long
3121 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
3122 {
3123         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
3124 }
3125 
3126 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
3127 {
3128         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
3129 }
3130 
3131 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
3132                    disk_bytenr, 64);
3133 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
3134                    generation, 64);
3135 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
3136                    disk_num_bytes, 64);
3137 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
3138                   offset, 64);
3139 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
3140                    num_bytes, 64);
3141 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
3142                    ram_bytes, 64);
3143 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
3144                    compression, 8);
3145 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
3146                    encryption, 8);
3147 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
3148                    other_encoding, 16);
3149 
3150 /*
3151  * this returns the number of bytes used by the item on disk, minus the
3152  * size of any extent headers.  If a file is compressed on disk, this is
3153  * the compressed size
3154  */
3155 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
3156                                                     struct btrfs_item *e)
3157 {
3158         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
3159 }
3160 
3161 /* this returns the number of file bytes represented by the inline item.
3162  * If an item is compressed, this is the uncompressed size
3163  */
3164 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
3165                                                int slot,
3166                                                struct btrfs_file_extent_item *fi)
3167 {
3168         struct btrfs_map_token token;
3169 
3170         btrfs_init_map_token(&token);
3171         /*
3172          * return the space used on disk if this item isn't
3173          * compressed or encoded
3174          */
3175         if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
3176             btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
3177             btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
3178                 return btrfs_file_extent_inline_item_len(eb,
3179                                                          btrfs_item_nr(slot));
3180         }
3181 
3182         /* otherwise use the ram bytes field */
3183         return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
3184 }
3185 
3186 
3187 /* btrfs_dev_stats_item */
3188 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
3189                                         struct btrfs_dev_stats_item *ptr,
3190                                         int index)
3191 {
3192         u64 val;
3193 
3194         read_extent_buffer(eb, &val,
3195                            offsetof(struct btrfs_dev_stats_item, values) +
3196                             ((unsigned long)ptr) + (index * sizeof(u64)),
3197                            sizeof(val));
3198         return val;
3199 }
3200 
3201 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
3202                                              struct btrfs_dev_stats_item *ptr,
3203                                              int index, u64 val)
3204 {
3205         write_extent_buffer(eb, &val,
3206                             offsetof(struct btrfs_dev_stats_item, values) +
3207                              ((unsigned long)ptr) + (index * sizeof(u64)),
3208                             sizeof(val));
3209 }
3210 
3211 /* btrfs_qgroup_status_item */
3212 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
3213                    generation, 64);
3214 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
3215                    version, 64);
3216 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
3217                    flags, 64);
3218 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
3219                    rescan, 64);
3220 
3221 /* btrfs_qgroup_info_item */
3222 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
3223                    generation, 64);
3224 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
3225 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
3226                    rfer_cmpr, 64);
3227 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
3228 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
3229                    excl_cmpr, 64);
3230 
3231 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
3232                          struct btrfs_qgroup_info_item, generation, 64);
3233 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
3234                          rfer, 64);
3235 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
3236                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
3237 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
3238                          excl, 64);
3239 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
3240                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
3241 
3242 /* btrfs_qgroup_limit_item */
3243 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
3244                    flags, 64);
3245 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
3246                    max_rfer, 64);
3247 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
3248                    max_excl, 64);
3249 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
3250                    rsv_rfer, 64);
3251 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
3252                    rsv_excl, 64);
3253 
3254 /* btrfs_dev_replace_item */
3255 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
3256                    struct btrfs_dev_replace_item, src_devid, 64);
3257 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
3258                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
3259                    64);
3260 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
3261                    replace_state, 64);
3262 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
3263                    time_started, 64);
3264 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
3265                    time_stopped, 64);
3266 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
3267                    num_write_errors, 64);
3268 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
3269                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
3270                    64);
3271 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
3272                    cursor_left, 64);
3273 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
3274                    cursor_right, 64);
3275 
3276 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
3277                          struct btrfs_dev_replace_item, src_devid, 64);
3278 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
3279                          struct btrfs_dev_replace_item,
3280                          cont_reading_from_srcdev_mode, 64);
3281 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
3282                          struct btrfs_dev_replace_item, replace_state, 64);
3283 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
3284                          struct btrfs_dev_replace_item, time_started, 64);
3285 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
3286                          struct btrfs_dev_replace_item, time_stopped, 64);
3287 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
3288                          struct btrfs_dev_replace_item, num_write_errors, 64);
3289 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
3290                          struct btrfs_dev_replace_item,
3291                          num_uncorrectable_read_errors, 64);
3292 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
3293                          struct btrfs_dev_replace_item, cursor_left, 64);
3294 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
3295                          struct btrfs_dev_replace_item, cursor_right, 64);
3296 
3297 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
3298 {
3299         return sb->s_fs_info;
3300 }
3301 
3302 /* helper function to cast into the data area of the leaf. */
3303 #define btrfs_item_ptr(leaf, slot, type) \
3304         ((type *)(btrfs_leaf_data(leaf) + \
3305         btrfs_item_offset_nr(leaf, slot)))
3306 
3307 #define btrfs_item_ptr_offset(leaf, slot) \
3308         ((unsigned long)(btrfs_leaf_data(leaf) + \
3309         btrfs_item_offset_nr(leaf, slot)))
3310 
3311 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
3312 {
3313         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
3314                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
3315 }
3316 
3317 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
3318 {
3319         return mapping_gfp_mask(mapping) & ~__GFP_FS;
3320 }
3321 
3322 /* extent-tree.c */
3323 
3324 u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes);
3325 
3326 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
3327                                                  unsigned num_items)
3328 {
3329         return (root->nodesize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3330                 2 * num_items;
3331 }
3332 
3333 /*
3334  * Doing a truncate won't result in new nodes or leaves, just what we need for
3335  * COW.
3336  */
3337 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
3338                                                  unsigned num_items)
3339 {
3340         return root->nodesize * BTRFS_MAX_LEVEL * num_items;
3341 }
3342 
3343 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
3344                                        struct btrfs_root *root);
3345 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
3346                                        struct btrfs_root *root);
3347 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3348 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
3349                            struct btrfs_root *root, unsigned long count);
3350 int btrfs_async_run_delayed_refs(struct btrfs_root *root,
3351                                  unsigned long count, int wait);
3352 int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len);
3353 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
3354                              struct btrfs_root *root, u64 bytenr,
3355                              u64 offset, int metadata, u64 *refs, u64 *flags);
3356 int btrfs_pin_extent(struct btrfs_root *root,
3357                      u64 bytenr, u64 num, int reserved);
3358 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root,
3359                                     u64 bytenr, u64 num_bytes);
3360 int btrfs_exclude_logged_extents(struct btrfs_root *root,
3361                                  struct extent_buffer *eb);
3362 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
3363                           struct btrfs_root *root,
3364                           u64 objectid, u64 offset, u64 bytenr);
3365 struct btrfs_block_group_cache *btrfs_lookup_block_group(
3366                                                  struct btrfs_fs_info *info,
3367                                                  u64 bytenr);
3368 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3369 int get_block_group_index(struct btrfs_block_group_cache *cache);
3370 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
3371                                         struct btrfs_root *root, u64 parent,
3372                                         u64 root_objectid,
3373                                         struct btrfs_disk_key *key, int level,
3374                                         u64 hint, u64 empty_size);
3375 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
3376                            struct btrfs_root *root,
3377                            struct extent_buffer *buf,
3378                            u64 parent, int last_ref);
3379 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
3380                                      struct btrfs_root *root,
3381                                      u64 root_objectid, u64 owner,
3382                                      u64 offset, struct btrfs_key *ins);
3383 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
3384                                    struct btrfs_root *root,
3385                                    u64 root_objectid, u64 owner, u64 offset,
3386                                    struct btrfs_key *ins);
3387 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes,
3388                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
3389                          struct btrfs_key *ins, int is_data, int delalloc);
3390 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3391                   struct extent_buffer *buf, int full_backref);
3392 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3393                   struct extent_buffer *buf, int full_backref);
3394 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
3395                                 struct btrfs_root *root,
3396                                 u64 bytenr, u64 num_bytes, u64 flags,
3397                                 int level, int is_data);
3398 int btrfs_free_extent(struct btrfs_trans_handle *trans,
3399                       struct btrfs_root *root,
3400                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
3401                       u64 owner, u64 offset);
3402 
3403 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len,
3404                                int delalloc);
3405 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
3406                                        u64 start, u64 len);
3407 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
3408                                  struct btrfs_root *root);
3409 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
3410                                struct btrfs_root *root);
3411 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
3412                          struct btrfs_root *root,
3413                          u64 bytenr, u64 num_bytes, u64 parent,
3414                          u64 root_objectid, u64 owner, u64 offset);
3415 
3416 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
3417                                    struct btrfs_root *root);
3418 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
3419                                     struct btrfs_root *root);
3420 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
3421                             struct btrfs_root *root);
3422 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
3423 int btrfs_free_block_groups(struct btrfs_fs_info *info);
3424 int btrfs_read_block_groups(struct btrfs_root *root);
3425 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3426 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
3427                            struct btrfs_root *root, u64 bytes_used,
3428                            u64 type, u64 chunk_objectid, u64 chunk_offset,
3429                            u64 size);
3430 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
3431                              struct btrfs_root *root, u64 group_start,
3432                              struct extent_map *em);
3433 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
3434 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
3435 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
3436 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
3437                                        struct btrfs_root *root);
3438 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3439 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
3440 
3441 enum btrfs_reserve_flush_enum {
3442         /* If we are in the transaction, we can't flush anything.*/
3443         BTRFS_RESERVE_NO_FLUSH,
3444         /*
3445          * Flushing delalloc may cause deadlock somewhere, in this
3446          * case, use FLUSH LIMIT
3447          */
3448         BTRFS_RESERVE_FLUSH_LIMIT,
3449         BTRFS_RESERVE_FLUSH_ALL,
3450 };
3451 
3452 int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes);
3453 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3454 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
3455                                 struct btrfs_root *root);
3456 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
3457 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
3458                                   struct inode *inode);
3459 void btrfs_orphan_release_metadata(struct inode *inode);
3460 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
3461                                      struct btrfs_block_rsv *rsv,
3462                                      int nitems,
3463                                      u64 *qgroup_reserved, bool use_global_rsv);
3464 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
3465                                       struct btrfs_block_rsv *rsv,
3466                                       u64 qgroup_reserved);
3467 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
3468 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
3469 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
3470 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
3471 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
3472 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
3473                                               unsigned short type);
3474 void btrfs_free_block_rsv(struct btrfs_root *root,
3475                           struct btrfs_block_rsv *rsv);
3476 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
3477 int btrfs_block_rsv_add(struct btrfs_root *root,
3478                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
3479                         enum btrfs_reserve_flush_enum flush);
3480 int btrfs_block_rsv_check(struct btrfs_root *root,
3481                           struct btrfs_block_rsv *block_rsv, int min_factor);
3482 int btrfs_block_rsv_refill(struct btrfs_root *root,
3483                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
3484                            enum btrfs_reserve_flush_enum flush);
3485 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
3486                             struct btrfs_block_rsv *dst_rsv,
3487                             u64 num_bytes);
3488 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
3489                              struct btrfs_block_rsv *dest, u64 num_bytes,
3490                              int min_factor);
3491 void btrfs_block_rsv_release(struct btrfs_root *root,
3492                              struct btrfs_block_rsv *block_rsv,
3493                              u64 num_bytes);
3494 int btrfs_inc_block_group_ro(struct btrfs_root *root,
3495                              struct btrfs_block_group_cache *cache);
3496 void btrfs_dec_block_group_ro(struct btrfs_root *root,
3497                               struct btrfs_block_group_cache *cache);
3498 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3499 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
3500 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
3501                                    u64 start, u64 end);
3502 int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
3503                          u64 num_bytes, u64 *actual_bytes);
3504 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
3505                             struct btrfs_root *root, u64 type);
3506 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
3507 
3508 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3509 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
3510                                          struct btrfs_fs_info *fs_info);
3511 int __get_raid_index(u64 flags);
3512 int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
3513 void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
3514 void check_system_chunk(struct btrfs_trans_handle *trans,
3515                         struct btrfs_root *root,
3516                         const u64 type);
3517 /* ctree.c */
3518 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
3519                      int level, int *slot);
3520 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
3521 int btrfs_previous_item(struct btrfs_root *root,
3522                         struct btrfs_path *path, u64 min_objectid,
3523                         int type);
3524 int btrfs_previous_extent_item(struct btrfs_root *root,
3525                         struct btrfs_path *path, u64 min_objectid);
3526 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
3527                              struct btrfs_path *path,
3528                              struct btrfs_key *new_key);
3529 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
3530 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3531 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3532                         struct btrfs_key *key, int lowest_level,
3533                         u64 min_trans);
3534 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3535                          struct btrfs_path *path,
3536                          u64 min_trans);
3537 enum btrfs_compare_tree_result {
3538         BTRFS_COMPARE_TREE_NEW,
3539         BTRFS_COMPARE_TREE_DELETED,
3540         BTRFS_COMPARE_TREE_CHANGED,
3541         BTRFS_COMPARE_TREE_SAME,
3542 };
3543 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
3544                                   struct btrfs_root *right_root,
3545                                   struct btrfs_path *left_path,
3546                                   struct btrfs_path *right_path,
3547                                   struct btrfs_key *key,
3548                                   enum btrfs_compare_tree_result result,
3549                                   void *ctx);
3550 int btrfs_compare_trees(struct btrfs_root *left_root,
3551                         struct btrfs_root *right_root,
3552                         btrfs_changed_cb_t cb, void *ctx);
3553 int btrfs_cow_block(struct btrfs_trans_handle *trans,
3554                     struct btrfs_root *root, struct extent_buffer *buf,
3555                     struct extent_buffer *parent, int parent_slot,
3556                     struct extent_buffer **cow_ret);
3557 int btrfs_copy_root(struct btrfs_trans_handle *trans,
3558                       struct btrfs_root *root,
3559                       struct extent_buffer *buf,
3560                       struct extent_buffer **cow_ret, u64 new_root_objectid);
3561 int btrfs_block_can_be_shared(struct btrfs_root *root,
3562                               struct extent_buffer *buf);
3563 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
3564                        u32 data_size);
3565 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
3566                          u32 new_size, int from_end);
3567 int btrfs_split_item(struct btrfs_trans_handle *trans,
3568                      struct btrfs_root *root,
3569                      struct btrfs_path *path,
3570                      struct btrfs_key *new_key,
3571                      unsigned long split_offset);
3572 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
3573                          struct btrfs_root *root,
3574                          struct btrfs_path *path,
3575                          struct btrfs_key *new_key);
3576 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
3577                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
3578 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
3579                       *root, struct btrfs_key *key, struct btrfs_path *p, int
3580                       ins_len, int cow);
3581 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
3582                           struct btrfs_path *p, u64 time_seq);
3583 int btrfs_search_slot_for_read(struct btrfs_root *root,
3584                                struct btrfs_key *key, struct btrfs_path *p,
3585                                int find_higher, int return_any);
3586 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3587                        struct btrfs_root *root, struct extent_buffer *parent,
3588                        int start_slot, u64 *last_ret,
3589                        struct btrfs_key *progress);
3590 void btrfs_release_path(struct btrfs_path *p);
3591 struct btrfs_path *btrfs_alloc_path(void);
3592 void btrfs_free_path(struct btrfs_path *p);
3593 void btrfs_set_path_blocking(struct btrfs_path *p);
3594 void btrfs_clear_path_blocking(struct btrfs_path *p,
3595                                struct extent_buffer *held, int held_rw);
3596 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
3597 
3598 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3599                    struct btrfs_path *path, int slot, int nr);
3600 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3601                                  struct btrfs_root *root,
3602                                  struct btrfs_path *path)
3603 {
3604         return btrfs_del_items(trans, root, path, path->slots[0], 1);
3605 }
3606 
3607 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
3608                             struct btrfs_key *cpu_key, u32 *data_size,
3609                             u32 total_data, u32 total_size, int nr);
3610 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3611                       *root, struct btrfs_key *key, void *data, u32 data_size);
3612 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3613                              struct btrfs_root *root,
3614                              struct btrfs_path *path,
3615                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
3616 
3617 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3618                                           struct btrfs_root *root,
3619                                           struct btrfs_path *path,
3620                                           struct btrfs_key *key,
3621                                           u32 data_size)
3622 {
3623         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3624 }
3625 
3626 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3627 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3628 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3629                         u64 time_seq);
3630 static inline int btrfs_next_old_item(struct btrfs_root *root,
3631                                       struct btrfs_path *p, u64 time_seq)
3632 {
3633         ++p->slots[0];
3634         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3635                 return btrfs_next_old_leaf(root, p, time_seq);
3636         return 0;
3637 }
3638 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3639 {
3640         return btrfs_next_old_item(root, p, 0);
3641 }
3642 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3643 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3644                                      struct btrfs_block_rsv *block_rsv,
3645                                      int update_ref, int for_reloc);
3646 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3647                         struct btrfs_root *root,
3648                         struct extent_buffer *node,
3649                         struct extent_buffer *parent);
3650 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3651 {
3652         /*
3653          * Get synced with close_ctree()
3654          */
3655         smp_mb();
3656         return fs_info->closing;
3657 }
3658 
3659 /*
3660  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3661  * anything except sleeping. This function is used to check the status of
3662  * the fs.
3663  */
3664 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
3665 {
3666         return (root->fs_info->sb->s_flags & MS_RDONLY ||
3667                 btrfs_fs_closing(root->fs_info));
3668 }
3669 
3670 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3671 {
3672         kfree(fs_info->balance_ctl);
3673         kfree(fs_info->delayed_root);
3674         kfree(fs_info->extent_root);
3675         kfree(fs_info->tree_root);
3676         kfree(fs_info->chunk_root);
3677         kfree(fs_info->dev_root);
3678         kfree(fs_info->csum_root);
3679         kfree(fs_info->quota_root);
3680         kfree(fs_info->uuid_root);
3681         kfree(fs_info->super_copy);
3682         kfree(fs_info->super_for_commit);
3683         security_free_mnt_opts(&fs_info->security_opts);
3684         kfree(fs_info);
3685 }
3686 
3687 /* tree mod log functions from ctree.c */
3688 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3689                            struct seq_list *elem);
3690 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3691                             struct seq_list *elem);
3692 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3693 
3694 /* root-item.c */
3695 int btrfs_find_root_ref(struct btrfs_root *tree_root,
3696                         struct btrfs_path *path,
3697                         u64 root_id, u64 ref_id);
3698 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3699                        struct btrfs_root *tree_root,
3700                        u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3701                        const char *name, int name_len);
3702 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3703                        struct btrfs_root *tree_root,
3704                        u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3705                        const char *name, int name_len);
3706 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3707                    struct btrfs_key *key);
3708 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3709                       *root, struct btrfs_key *key, struct btrfs_root_item
3710                       *item);
3711 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3712                                    struct btrfs_root *root,
3713                                    struct btrfs_key *key,
3714                                    struct btrfs_root_item *item);
3715 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
3716                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3717                     struct btrfs_key *root_key);
3718 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3719 void btrfs_set_root_node(struct btrfs_root_item *item,
3720                          struct extent_buffer *node);
3721 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3722 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3723                              struct btrfs_root *root);
3724 
3725 /* uuid-tree.c */
3726 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
3727                         struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3728                         u64 subid);
3729 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
3730                         struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3731                         u64 subid);
3732 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3733                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3734                                               u64));
3735 
3736 /* dir-item.c */
3737 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3738                           const char *name, int name_len);
3739 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3740                           struct btrfs_root *root, const char *name,
3741                           int name_len, struct inode *dir,
3742                           struct btrfs_key *location, u8 type, u64 index);
3743 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3744                                              struct btrfs_root *root,
3745                                              struct btrfs_path *path, u64 dir,
3746                                              const char *name, int name_len,
3747                                              int mod);
3748 struct btrfs_dir_item *
3749 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3750                             struct btrfs_root *root,
3751                             struct btrfs_path *path, u64 dir,
3752                             u64 objectid, const char *name, int name_len,
3753                             int mod);
3754 struct btrfs_dir_item *
3755 btrfs_search_dir_index_item(struct btrfs_root *root,
3756                             struct btrfs_path *path, u64 dirid,
3757                             const char *name, int name_len);
3758 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3759                               struct btrfs_root *root,
3760                               struct btrfs_path *path,
3761                               struct btrfs_dir_item *di);
3762 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3763                             struct btrfs_root *root,
3764                             struct btrfs_path *path, u64 objectid,
3765                             const char *name, u16 name_len,
3766                             const void *data, u16 data_len);
3767 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3768                                           struct btrfs_root *root,
3769                                           struct btrfs_path *path, u64 dir,
3770                                           const char *name, u16 name_len,
3771                                           int mod);
3772 int verify_dir_item(struct btrfs_root *root,
3773                     struct extent_buffer *leaf,
3774                     struct btrfs_dir_item *dir_item);
3775 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
3776                                                  struct btrfs_path *path,
3777                                                  const char *name,
3778                                                  int name_len);
3779 
3780 /* orphan.c */
3781 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3782                              struct btrfs_root *root, u64 offset);
3783 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3784                           struct btrfs_root *root, u64 offset);
3785 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3786 
3787 /* inode-item.c */
3788 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3789                            struct btrfs_root *root,
3790                            const char *name, int name_len,
3791                            u64 inode_objectid, u64 ref_objectid, u64 index);
3792 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3793                            struct btrfs_root *root,
3794                            const char *name, int name_len,
3795                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3796 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3797                              struct btrfs_root *root,
3798                              struct btrfs_path *path, u64 objectid);
3799 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3800                        *root, struct btrfs_path *path,
3801                        struct btrfs_key *location, int mod);
3802 
3803 struct btrfs_inode_extref *
3804 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3805                           struct btrfs_root *root,
3806                           struct btrfs_path *path,
3807                           const char *name, int name_len,
3808                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3809                           int cow);
3810 
3811 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3812                                    u64 ref_objectid, const char *name,
3813                                    int name_len,
3814                                    struct btrfs_inode_extref **extref_ret);
3815 
3816 /* file-item.c */
3817 struct btrfs_dio_private;
3818 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3819                     struct btrfs_root *root, u64 bytenr, u64 len);
3820 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3821                           struct bio *bio, u32 *dst);
3822 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3823                               struct bio *bio, u64 logical_offset);
3824 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3825                              struct btrfs_root *root,
3826                              u64 objectid, u64 pos,
3827                              u64 disk_offset, u64 disk_num_bytes,
3828                              u64 num_bytes, u64 offset, u64 ram_bytes,
3829                              u8 compression, u8 encryption, u16 other_encoding);
3830 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3831                              struct btrfs_root *root,
3832                              struct btrfs_path *path, u64 objectid,
3833                              u64 bytenr, int mod);
3834 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3835                            struct btrfs_root *root,
3836                            struct btrfs_ordered_sum *sums);
3837 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3838                        struct bio *bio, u64 file_start, int contig);
3839 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3840                              struct list_head *list, int search_commit);
3841 void btrfs_extent_item_to_extent_map(struct inode *inode,
3842                                      const struct btrfs_path *path,
3843                                      struct btrfs_file_extent_item *fi,
3844                                      const bool new_inline,
3845                                      struct extent_map *em);
3846 
3847 /* inode.c */
3848 struct btrfs_delalloc_work {
3849         struct inode *inode;
3850         int wait;
3851         int delay_iput;
3852         struct completion completion;
3853         struct list_head list;
3854         struct btrfs_work work;
3855 };
3856 
3857 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3858                                                     int wait, int delay_iput);
3859 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3860 
3861 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3862                                            size_t pg_offset, u64 start, u64 len,
3863                                            int create);
3864 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3865                               u64 *orig_start, u64 *orig_block_len,
3866                               u64 *ram_bytes);
3867 
3868 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3869 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3870 #define ClearPageChecked ClearPageFsMisc
3871 #define SetPageChecked SetPageFsMisc
3872 #define PageChecked PageFsMisc
3873 #endif
3874 
3875 /* This forces readahead on a given range of bytes in an inode */
3876 static inline void btrfs_force_ra(struct address_space *mapping,
3877                                   struct file_ra_state *ra, struct file *file,
3878                                   pgoff_t offset, unsigned long req_size)
3879 {
3880         page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3881 }
3882 
3883 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3884 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3885 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3886                        struct btrfs_root *root,
3887                        struct inode *dir, struct inode *inode,
3888                        const char *name, int name_len);
3889 int btrfs_add_link(struct btrfs_trans_handle *trans,
3890                    struct inode *parent_inode, struct inode *inode,
3891                    const char *name, int name_len, int add_backref, u64 index);
3892 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3893                         struct btrfs_root *root,
3894                         struct inode *dir, u64 objectid,
3895                         const char *name, int name_len);
3896 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
3897                         int front);
3898 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3899                                struct btrfs_root *root,
3900                                struct inode *inode, u64 new_size,
3901                                u32 min_type);
3902 
3903 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3904 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3905                                int nr);
3906 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3907                               struct extent_state **cached_state);
3908 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3909                              struct btrfs_root *new_root,
3910                              struct btrfs_root *parent_root,
3911                              u64 new_dirid);
3912 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
3913                          size_t size, struct bio *bio,
3914                          unsigned long bio_flags);
3915 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3916 int btrfs_readpage(struct file *file, struct page *page);
3917 void btrfs_evict_inode(struct inode *inode);
3918 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3919 struct inode *btrfs_alloc_inode(struct super_block *sb);
3920 void btrfs_destroy_inode(struct inode *inode);
3921 int btrfs_drop_inode(struct inode *inode);
3922 int btrfs_init_cachep(void);
3923 void btrfs_destroy_cachep(void);
3924 long btrfs_ioctl_trans_end(struct file *file);
3925 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3926                          struct btrfs_root *root, int *was_new);
3927 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3928                                     size_t pg_offset, u64 start, u64 end,
3929                                     int create);
3930 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3931                               struct btrfs_root *root,
3932                               struct inode *inode);
3933 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3934                                 struct btrfs_root *root, struct inode *inode);
3935 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3936 int btrfs_orphan_cleanup(struct btrfs_root *root);
3937 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3938                               struct btrfs_root *root);
3939 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3940 void btrfs_invalidate_inodes(struct btrfs_root *root);
3941 void btrfs_add_delayed_iput(struct inode *inode);
3942 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3943 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3944                               u64 start, u64 num_bytes, u64 min_size,
3945                               loff_t actual_len, u64 *alloc_hint);
3946 int btrfs_prealloc_file_range_trans(struct inode *inode,
3947                                     struct btrfs_trans_handle *trans, int mode,
3948                                     u64 start, u64 num_bytes, u64 min_size,
3949                                     loff_t actual_len, u64 *alloc_hint);
3950 int btrfs_inode_check_errors(struct inode *inode);
3951 extern const struct dentry_operations btrfs_dentry_operations;
3952 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3953 void btrfs_test_inode_set_ops(struct inode *inode);
3954 #endif
3955 
3956 /* ioctl.c */
3957 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3958 void btrfs_update_iflags(struct inode *inode);
3959 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3960 int btrfs_is_empty_uuid(u8 *uuid);
3961 int btrfs_defrag_file(struct inode *inode, struct file *file,
3962                       struct btrfs_ioctl_defrag_range_args *range,
3963                       u64 newer_than, unsigned long max_pages);
3964 void btrfs_get_block_group_info(struct list_head *groups_list,
3965                                 struct btrfs_ioctl_space_info *space);
3966 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3967                                struct btrfs_ioctl_balance_args *bargs);
3968 
3969 
3970 /* file.c */
3971 int btrfs_auto_defrag_init(void);
3972 void btrfs_auto_defrag_exit(void);
3973 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3974                            struct inode *inode);
3975 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3976 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3977 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3978 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3979                              int skip_pinned);
3980 extern const struct file_operations btrfs_file_operations;
3981 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3982                          struct btrfs_root *root, struct inode *inode,
3983                          struct btrfs_path *path, u64 start, u64 end,
3984                          u64 *drop_end, int drop_cache,
3985                          int replace_extent,
3986                          u32 extent_item_size,
3987                          int *key_inserted);
3988 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3989                        struct btrfs_root *root, struct inode *inode, u64 start,
3990                        u64 end, int drop_cache);
3991 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3992                               struct inode *inode, u64 start, u64 end);
3993 int btrfs_release_file(struct inode *inode, struct file *file);
3994 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3995                       struct page **pages, size_t num_pages,
3996                       loff_t pos, size_t write_bytes,
3997                       struct extent_state **cached);
3998 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3999 
4000 /* tree-defrag.c */
4001 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
4002                         struct btrfs_root *root);
4003 
4004 /* sysfs.c */
4005 int btrfs_init_sysfs(void);
4006 void btrfs_exit_sysfs(void);
4007 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info);
4008 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info);
4009 
4010 /* xattr.c */
4011 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
4012 
4013 /* super.c */
4014 int btrfs_parse_options(struct btrfs_root *root, char *options);
4015 int btrfs_sync_fs(struct super_block *sb, int wait);
4016 
4017 #ifdef CONFIG_PRINTK
4018 __printf(2, 3)
4019 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
4020 #else
4021 static inline __printf(2, 3)
4022 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
4023 {
4024 }
4025 #endif
4026 
4027 #define btrfs_emerg(fs_info, fmt, args...) \
4028         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
4029 #define btrfs_alert(fs_info, fmt, args...) \
4030         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
4031 #define btrfs_crit(fs_info, fmt, args...) \
4032         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
4033 #define btrfs_err(fs_info, fmt, args...) \
4034         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
4035 #define btrfs_warn(fs_info, fmt, args...) \
4036         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
4037 #define btrfs_notice(fs_info, fmt, args...) \
4038         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
4039 #define btrfs_info(fs_info, fmt, args...) \
4040         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
4041 
4042 #ifdef DEBUG
4043 #define btrfs_debug(fs_info, fmt, args...) \
4044         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
4045 #else
4046 #define btrfs_debug(fs_info, fmt, args...) \
4047     no_printk(KERN_DEBUG fmt, ##args)
4048 #endif
4049 
4050 #ifdef CONFIG_BTRFS_ASSERT
4051 
4052 __cold
4053 static inline void assfail(char *expr, char *file, int line)
4054 {
4055         pr_err("BTRFS: assertion failed: %s, file: %s, line: %d",
4056                expr, file, line);
4057         BUG();
4058 }
4059 
4060 #define ASSERT(expr)    \
4061         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
4062 #else
4063 #define ASSERT(expr)    ((void)0)
4064 #endif
4065 
4066 #define btrfs_assert()
4067 __printf(5, 6)
4068 __cold
4069 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
4070                      unsigned int line, int errno, const char *fmt, ...);
4071 
4072 const char *btrfs_decode_error(int errno);
4073 
4074 __cold
4075 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
4076                                struct btrfs_root *root, const char *function,
4077                                unsigned int line, int errno);
4078 
4079 #define btrfs_set_fs_incompat(__fs_info, opt) \
4080         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
4081 
4082 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
4083                                            u64 flag)
4084 {
4085         struct btrfs_super_block *disk_super;
4086         u64 features;
4087 
4088         disk_super = fs_info->super_copy;
4089         features = btrfs_super_incompat_flags(disk_super);
4090         if (!(features & flag)) {
4091                 spin_lock(&fs_info->super_lock);
4092                 features = btrfs_super_incompat_flags(disk_super);
4093                 if (!(features & flag)) {
4094                         features |= flag;
4095                         btrfs_set_super_incompat_flags(disk_super, features);
4096                         btrfs_info(fs_info, "setting %llu feature flag",
4097                                          flag);
4098                 }
4099                 spin_unlock(&fs_info->super_lock);
4100         }
4101 }
4102 
4103 #define btrfs_fs_incompat(fs_info, opt) \
4104         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
4105 
4106 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
4107 {
4108         struct btrfs_super_block *disk_super;
4109         disk_super = fs_info->super_copy;
4110         return !!(btrfs_super_incompat_flags(disk_super) & flag);
4111 }
4112 
4113 /*
4114  * Call btrfs_abort_transaction as early as possible when an error condition is
4115  * detected, that way the exact line number is reported.
4116  */
4117 #define btrfs_abort_transaction(trans, root, errno)             \
4118 do {                                                            \
4119         /* Report first abort since mount */                    \
4120         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
4121                         &((root)->fs_info->fs_state))) {        \
4122                 WARN(1, KERN_DEBUG                              \
4123                 "BTRFS: Transaction aborted (error %d)\n",      \
4124                 (errno));                                       \
4125         }                                                       \
4126         __btrfs_abort_transaction((trans), (root), __func__,    \
4127                                   __LINE__, (errno));           \
4128 } while (0)
4129 
4130 #define btrfs_std_error(fs_info, errno)                         \
4131 do {                                                            \
4132         if ((errno))                                            \
4133                 __btrfs_std_error((fs_info), __func__,          \
4134                                    __LINE__, (errno), NULL);    \
4135 } while (0)
4136 
4137 #define btrfs_error(fs_info, errno, fmt, args...)               \
4138 do {                                                            \
4139         __btrfs_std_error((fs_info), __func__, __LINE__,        \
4140                           (errno), fmt, ##args);                \
4141 } while (0)
4142 
4143 __printf(5, 6)
4144 __cold
4145 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
4146                    unsigned int line, int errno, const char *fmt, ...);
4147 
4148 /*
4149  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
4150  * will panic().  Otherwise we BUG() here.
4151  */
4152 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
4153 do {                                                                    \
4154         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
4155         BUG();                                                          \
4156 } while (0)
4157 
4158 /* acl.c */
4159 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
4160 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
4161 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
4162 int btrfs_init_acl(struct btrfs_trans_handle *trans,
4163                    struct inode *inode, struct inode *dir);
4164 #else
4165 #define btrfs_get_acl NULL
4166 #define btrfs_set_acl NULL
4167 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
4168                                  struct inode *inode, struct inode *dir)
4169 {
4170         return 0;
4171 }
4172 #endif
4173 
4174 /* relocation.c */
4175 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
4176 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
4177                           struct btrfs_root *root);
4178 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
4179                             struct btrfs_root *root);
4180 int btrfs_recover_relocation(struct btrfs_root *root);
4181 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
4182 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
4183                           struct btrfs_root *root, struct extent_buffer *buf,
4184                           struct extent_buffer *cow);
4185 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
4186                               u64 *bytes_to_reserve);
4187 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
4188                               struct btrfs_pending_snapshot *pending);
4189 
4190 /* scrub.c */
4191 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
4192                     u64 end, struct btrfs_scrub_progress *progress,
4193                     int readonly, int is_dev_replace);
4194 void btrfs_scrub_pause(struct btrfs_root *root);
4195 void btrfs_scrub_continue(struct btrfs_root *root);
4196 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
4197 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
4198                            struct btrfs_device *dev);
4199 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
4200                          struct btrfs_scrub_progress *progress);
4201 
4202 /* dev-replace.c */
4203 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
4204 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
4205 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
4206 
4207 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
4208 {
4209         btrfs_bio_counter_sub(fs_info, 1);
4210 }
4211 
4212 /* reada.c */
4213 struct reada_control {
4214         struct btrfs_root       *root;          /* tree to prefetch */
4215         struct btrfs_key        key_start;
4216         struct btrfs_key        key_end;        /* exclusive */
4217         atomic_t                elems;
4218         struct kref             refcnt;
4219         wait_queue_head_t       wait;
4220 };
4221 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
4222                               struct btrfs_key *start, struct btrfs_key *end);
4223 int btrfs_reada_wait(void *handle);
4224 void btrfs_reada_detach(void *handle);
4225 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
4226                          u64 start, int err);
4227 
4228 static inline int is_fstree(u64 rootid)
4229 {
4230         if (rootid == BTRFS_FS_TREE_OBJECTID ||
4231             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
4232               !btrfs_qgroup_level(rootid)))
4233                 return 1;
4234         return 0;
4235 }
4236 
4237 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
4238 {
4239         return signal_pending(current);
4240 }
4241 
4242 /* Sanity test specific functions */
4243 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4244 void btrfs_test_destroy_inode(struct inode *inode);
4245 #endif
4246 
4247 static inline int btrfs_test_is_dummy_root(struct btrfs_root *root)
4248 {
4249 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4250         if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
4251                 return 1;
4252 #endif
4253         return 0;
4254 }
4255 
4256 #endif
4257 

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