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

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