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

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

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