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

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