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

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