1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
6 #ifndef __XFS_FORMAT_H__
7 #define __XFS_FORMAT_H__
10 * XFS On Disk Format Definitions
12 * This header file defines all the on-disk format definitions for
13 * general XFS objects. Directory and attribute related objects are defined in
14 * xfs_da_format.h, which log and log item formats are defined in
15 * xfs_log_format.h. Everything else goes here.
26 * Fits into a sector-sized buffer at address 0 of each allocation group.
27 * Only the first of these is ever updated except during growfs.
29 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
30 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
31 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
32 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
33 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
34 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
35 #define XFS_SB_VERSION_NUMBITS 0x000f
36 #define XFS_SB_VERSION_ALLFBITS 0xfff0
37 #define XFS_SB_VERSION_ATTRBIT 0x0010
38 #define XFS_SB_VERSION_NLINKBIT 0x0020
39 #define XFS_SB_VERSION_QUOTABIT 0x0040
40 #define XFS_SB_VERSION_ALIGNBIT 0x0080
41 #define XFS_SB_VERSION_DALIGNBIT 0x0100
42 #define XFS_SB_VERSION_SHAREDBIT 0x0200
43 #define XFS_SB_VERSION_LOGV2BIT 0x0400
44 #define XFS_SB_VERSION_SECTORBIT 0x0800
45 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
46 #define XFS_SB_VERSION_DIRV2BIT 0x2000
47 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
48 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
51 * The size of a single extended attribute on disk is limited by
52 * the size of index values within the attribute entries themselves.
53 * These are be16 fields, so we can only support attribute data
54 * sizes up to 2^16 bytes in length.
56 #define XFS_XATTR_SIZE_MAX (1 << 16)
59 * Supported feature bit list is just all bits in the versionnum field because
60 * we've used them all up and understand them all. Except, of course, for the
61 * shared superblock bit, which nobody knows what it does and so is unsupported.
63 #define XFS_SB_VERSION_OKBITS \
64 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
65 ~XFS_SB_VERSION_SHAREDBIT)
68 * There are two words to hold XFS "feature" bits: the original
69 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
70 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
72 * These defines represent bits in sb_features2.
74 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
75 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
76 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
77 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
78 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
79 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
80 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
81 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
83 #define XFS_SB_VERSION2_OKBITS \
84 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
85 XFS_SB_VERSION2_ATTR2BIT | \
86 XFS_SB_VERSION2_PROJID32BIT | \
87 XFS_SB_VERSION2_FTYPE)
89 /* Maximum size of the xfs filesystem label, no terminating NULL */
90 #define XFSLABEL_MAX 12
93 * Superblock - in core version. Must match the ondisk version below.
94 * Must be padded to 64 bit alignment.
96 typedef struct xfs_sb
{
97 uint32_t sb_magicnum
; /* magic number == XFS_SB_MAGIC */
98 uint32_t sb_blocksize
; /* logical block size, bytes */
99 xfs_rfsblock_t sb_dblocks
; /* number of data blocks */
100 xfs_rfsblock_t sb_rblocks
; /* number of realtime blocks */
101 xfs_rtbxlen_t sb_rextents
; /* number of realtime extents */
102 uuid_t sb_uuid
; /* user-visible file system unique id */
103 xfs_fsblock_t sb_logstart
; /* starting block of log if internal */
104 xfs_ino_t sb_rootino
; /* root inode number */
105 xfs_ino_t sb_rbmino
; /* bitmap inode for realtime extents */
106 xfs_ino_t sb_rsumino
; /* summary inode for rt bitmap */
107 xfs_agblock_t sb_rextsize
; /* realtime extent size, blocks */
108 xfs_agblock_t sb_agblocks
; /* size of an allocation group */
109 xfs_agnumber_t sb_agcount
; /* number of allocation groups */
110 xfs_extlen_t sb_rbmblocks
; /* number of rt bitmap blocks */
111 xfs_extlen_t sb_logblocks
; /* number of log blocks */
112 uint16_t sb_versionnum
; /* header version == XFS_SB_VERSION */
113 uint16_t sb_sectsize
; /* volume sector size, bytes */
114 uint16_t sb_inodesize
; /* inode size, bytes */
115 uint16_t sb_inopblock
; /* inodes per block */
116 char sb_fname
[XFSLABEL_MAX
]; /* file system name */
117 uint8_t sb_blocklog
; /* log2 of sb_blocksize */
118 uint8_t sb_sectlog
; /* log2 of sb_sectsize */
119 uint8_t sb_inodelog
; /* log2 of sb_inodesize */
120 uint8_t sb_inopblog
; /* log2 of sb_inopblock */
121 uint8_t sb_agblklog
; /* log2 of sb_agblocks (rounded up) */
122 uint8_t sb_rextslog
; /* log2 of sb_rextents */
123 uint8_t sb_inprogress
; /* mkfs is in progress, don't mount */
124 uint8_t sb_imax_pct
; /* max % of fs for inode space */
127 * These fields must remain contiguous. If you really
128 * want to change their layout, make sure you fix the
129 * code in xfs_trans_apply_sb_deltas().
131 uint64_t sb_icount
; /* allocated inodes */
132 uint64_t sb_ifree
; /* free inodes */
133 uint64_t sb_fdblocks
; /* free data blocks */
134 uint64_t sb_frextents
; /* free realtime extents */
136 * End contiguous fields.
138 xfs_ino_t sb_uquotino
; /* user quota inode */
139 xfs_ino_t sb_gquotino
; /* group quota inode */
140 uint16_t sb_qflags
; /* quota flags */
141 uint8_t sb_flags
; /* misc. flags */
142 uint8_t sb_shared_vn
; /* shared version number */
143 xfs_extlen_t sb_inoalignmt
; /* inode chunk alignment, fsblocks */
144 uint32_t sb_unit
; /* stripe or raid unit */
145 uint32_t sb_width
; /* stripe or raid width */
146 uint8_t sb_dirblklog
; /* log2 of dir block size (fsbs) */
147 uint8_t sb_logsectlog
; /* log2 of the log sector size */
148 uint16_t sb_logsectsize
; /* sector size for the log, bytes */
149 uint32_t sb_logsunit
; /* stripe unit size for the log */
150 uint32_t sb_features2
; /* additional feature bits */
153 * bad features2 field as a result of failing to pad the sb structure to
154 * 64 bits. Some machines will be using this field for features2 bits.
155 * Easiest just to mark it bad and not use it for anything else.
157 * This is not kept up to date in memory; it is always overwritten by
158 * the value in sb_features2 when formatting the incore superblock to
161 uint32_t sb_bad_features2
;
163 /* version 5 superblock fields start here */
166 uint32_t sb_features_compat
;
167 uint32_t sb_features_ro_compat
;
168 uint32_t sb_features_incompat
;
169 uint32_t sb_features_log_incompat
;
171 uint32_t sb_crc
; /* superblock crc */
172 xfs_extlen_t sb_spino_align
; /* sparse inode chunk alignment */
174 xfs_ino_t sb_pquotino
; /* project quota inode */
175 xfs_lsn_t sb_lsn
; /* last write sequence */
176 uuid_t sb_meta_uuid
; /* metadata file system unique id */
178 /* must be padded to 64 bit alignment */
181 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
184 * Superblock - on disk version. Must match the in core version above.
185 * Must be padded to 64 bit alignment.
188 __be32 sb_magicnum
; /* magic number == XFS_SB_MAGIC */
189 __be32 sb_blocksize
; /* logical block size, bytes */
190 __be64 sb_dblocks
; /* number of data blocks */
191 __be64 sb_rblocks
; /* number of realtime blocks */
192 __be64 sb_rextents
; /* number of realtime extents */
193 uuid_t sb_uuid
; /* user-visible file system unique id */
194 __be64 sb_logstart
; /* starting block of log if internal */
195 __be64 sb_rootino
; /* root inode number */
196 __be64 sb_rbmino
; /* bitmap inode for realtime extents */
197 __be64 sb_rsumino
; /* summary inode for rt bitmap */
198 __be32 sb_rextsize
; /* realtime extent size, blocks */
199 __be32 sb_agblocks
; /* size of an allocation group */
200 __be32 sb_agcount
; /* number of allocation groups */
201 __be32 sb_rbmblocks
; /* number of rt bitmap blocks */
202 __be32 sb_logblocks
; /* number of log blocks */
203 __be16 sb_versionnum
; /* header version == XFS_SB_VERSION */
204 __be16 sb_sectsize
; /* volume sector size, bytes */
205 __be16 sb_inodesize
; /* inode size, bytes */
206 __be16 sb_inopblock
; /* inodes per block */
207 char sb_fname
[XFSLABEL_MAX
]; /* file system name */
208 __u8 sb_blocklog
; /* log2 of sb_blocksize */
209 __u8 sb_sectlog
; /* log2 of sb_sectsize */
210 __u8 sb_inodelog
; /* log2 of sb_inodesize */
211 __u8 sb_inopblog
; /* log2 of sb_inopblock */
212 __u8 sb_agblklog
; /* log2 of sb_agblocks (rounded up) */
213 __u8 sb_rextslog
; /* log2 of sb_rextents */
214 __u8 sb_inprogress
; /* mkfs is in progress, don't mount */
215 __u8 sb_imax_pct
; /* max % of fs for inode space */
218 * These fields must remain contiguous. If you really
219 * want to change their layout, make sure you fix the
220 * code in xfs_trans_apply_sb_deltas().
222 __be64 sb_icount
; /* allocated inodes */
223 __be64 sb_ifree
; /* free inodes */
224 __be64 sb_fdblocks
; /* free data blocks */
225 __be64 sb_frextents
; /* free realtime extents */
227 * End contiguous fields.
229 __be64 sb_uquotino
; /* user quota inode */
230 __be64 sb_gquotino
; /* group quota inode */
231 __be16 sb_qflags
; /* quota flags */
232 __u8 sb_flags
; /* misc. flags */
233 __u8 sb_shared_vn
; /* shared version number */
234 __be32 sb_inoalignmt
; /* inode chunk alignment, fsblocks */
235 __be32 sb_unit
; /* stripe or raid unit */
236 __be32 sb_width
; /* stripe or raid width */
237 __u8 sb_dirblklog
; /* log2 of dir block size (fsbs) */
238 __u8 sb_logsectlog
; /* log2 of the log sector size */
239 __be16 sb_logsectsize
; /* sector size for the log, bytes */
240 __be32 sb_logsunit
; /* stripe unit size for the log */
241 __be32 sb_features2
; /* additional feature bits */
243 * bad features2 field as a result of failing to pad the sb
244 * structure to 64 bits. Some machines will be using this field
245 * for features2 bits. Easiest just to mark it bad and not use
246 * it for anything else.
248 __be32 sb_bad_features2
;
250 /* version 5 superblock fields start here */
253 __be32 sb_features_compat
;
254 __be32 sb_features_ro_compat
;
255 __be32 sb_features_incompat
;
256 __be32 sb_features_log_incompat
;
258 __le32 sb_crc
; /* superblock crc */
259 __be32 sb_spino_align
; /* sparse inode chunk alignment */
261 __be64 sb_pquotino
; /* project quota inode */
262 __be64 sb_lsn
; /* last write sequence */
263 uuid_t sb_meta_uuid
; /* metadata file system unique id */
265 /* must be padded to 64 bit alignment */
269 * Misc. Flags - warning - these will be cleared by xfs_repair unless
270 * a feature bit is set when the flag is used.
272 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
273 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
276 * define max. shared version we can interoperate with
278 #define XFS_SB_MAX_SHARED_VN 0
280 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
282 static inline bool xfs_sb_is_v5(struct xfs_sb
*sbp
)
284 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
;
288 * Detect a mismatched features2 field. Older kernels read/wrote
289 * this into the wrong slot, so to be safe we keep them in sync.
291 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb
*sbp
)
293 return sbp
->sb_bad_features2
!= sbp
->sb_features2
;
296 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb
*sbp
)
298 return xfs_sb_is_v5(sbp
) ||
299 (sbp
->sb_versionnum
& XFS_SB_VERSION_MOREBITSBIT
);
302 static inline void xfs_sb_version_addattr(struct xfs_sb
*sbp
)
304 sbp
->sb_versionnum
|= XFS_SB_VERSION_ATTRBIT
;
307 static inline void xfs_sb_version_addquota(struct xfs_sb
*sbp
)
309 sbp
->sb_versionnum
|= XFS_SB_VERSION_QUOTABIT
;
312 static inline void xfs_sb_version_addattr2(struct xfs_sb
*sbp
)
314 sbp
->sb_versionnum
|= XFS_SB_VERSION_MOREBITSBIT
;
315 sbp
->sb_features2
|= XFS_SB_VERSION2_ATTR2BIT
;
318 static inline void xfs_sb_version_addprojid32(struct xfs_sb
*sbp
)
320 sbp
->sb_versionnum
|= XFS_SB_VERSION_MOREBITSBIT
;
321 sbp
->sb_features2
|= XFS_SB_VERSION2_PROJID32BIT
;
325 * Extended v5 superblock feature masks. These are to be used for new v5
326 * superblock features only.
328 * Compat features are new features that old kernels will not notice or affect
329 * and so can mount read-write without issues.
331 * RO-Compat (read only) are features that old kernels can read but will break
332 * if they write. Hence only read-only mounts of such filesystems are allowed on
333 * kernels that don't support the feature bit.
335 * InCompat features are features which old kernels will not understand and so
338 * Log-InCompat features are for changes to log formats or new transactions that
339 * can't be replayed on older kernels. The fields are set when the filesystem is
340 * mounted, and a clean unmount clears the fields.
342 #define XFS_SB_FEAT_COMPAT_ALL 0
343 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
345 xfs_sb_has_compat_feature(
349 return (sbp
->sb_features_compat
& feature
) != 0;
352 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
353 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
354 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
355 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */
356 #define XFS_SB_FEAT_RO_COMPAT_ALL \
357 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
358 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
359 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
360 XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
361 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
363 xfs_sb_has_ro_compat_feature(
367 return (sbp
->sb_features_ro_compat
& feature
) != 0;
370 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
371 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
372 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
373 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */
374 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */
375 #define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */
376 #define XFS_SB_FEAT_INCOMPAT_ALL \
377 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
378 XFS_SB_FEAT_INCOMPAT_SPINODES| \
379 XFS_SB_FEAT_INCOMPAT_META_UUID| \
380 XFS_SB_FEAT_INCOMPAT_BIGTIME| \
381 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR| \
382 XFS_SB_FEAT_INCOMPAT_NREXT64)
384 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
386 xfs_sb_has_incompat_feature(
390 return (sbp
->sb_features_incompat
& feature
) != 0;
393 #define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
394 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
395 (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
396 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
398 xfs_sb_has_incompat_log_feature(
402 return (sbp
->sb_features_log_incompat
& feature
) != 0;
406 xfs_sb_remove_incompat_log_features(
409 sbp
->sb_features_log_incompat
&= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
;
413 xfs_sb_add_incompat_log_features(
415 unsigned int features
)
417 sbp
->sb_features_log_incompat
|= features
;
420 static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb
*sbp
)
422 return xfs_sb_is_v5(sbp
) && (sbp
->sb_features_log_incompat
&
423 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS
);
427 xfs_is_quota_inode(struct xfs_sb
*sbp
, xfs_ino_t ino
)
429 return (ino
== sbp
->sb_uquotino
||
430 ino
== sbp
->sb_gquotino
||
431 ino
== sbp
->sb_pquotino
);
434 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
435 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
437 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
438 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
439 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
440 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
441 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
444 * File system sector to basic block conversions.
446 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
449 * File system block to basic block conversions.
451 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
452 #define XFS_BB_TO_FSB(mp,bb) \
453 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
454 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
457 * File system block to byte conversions.
459 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
460 #define XFS_B_TO_FSB(mp,b) \
461 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
462 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
465 * Allocation group header
467 * This is divided into three structures, placed in sequential 512-byte
468 * buffers after a copy of the superblock (also in a 512-byte buffer).
470 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
471 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
472 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
473 #define XFS_AGF_VERSION 1
474 #define XFS_AGI_VERSION 1
476 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
477 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
480 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
483 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
486 * The second word of agf_levels in the first a.g. overlaps the EFS
487 * superblock's magic number. Since the magic numbers valid for EFS
488 * are > 64k, our value cannot be confused for an EFS superblock's.
491 typedef struct xfs_agf
{
493 * Common allocation group header information
495 __be32 agf_magicnum
; /* magic number == XFS_AGF_MAGIC */
496 __be32 agf_versionnum
; /* header version == XFS_AGF_VERSION */
497 __be32 agf_seqno
; /* sequence # starting from 0 */
498 __be32 agf_length
; /* size in blocks of a.g. */
500 * Freespace and rmap information
502 __be32 agf_roots
[XFS_BTNUM_AGF
]; /* root blocks */
503 __be32 agf_levels
[XFS_BTNUM_AGF
]; /* btree levels */
505 __be32 agf_flfirst
; /* first freelist block's index */
506 __be32 agf_fllast
; /* last freelist block's index */
507 __be32 agf_flcount
; /* count of blocks in freelist */
508 __be32 agf_freeblks
; /* total free blocks */
510 __be32 agf_longest
; /* longest free space */
511 __be32 agf_btreeblks
; /* # of blocks held in AGF btrees */
512 uuid_t agf_uuid
; /* uuid of filesystem */
514 __be32 agf_rmap_blocks
; /* rmapbt blocks used */
515 __be32 agf_refcount_blocks
; /* refcountbt blocks used */
517 __be32 agf_refcount_root
; /* refcount tree root block */
518 __be32 agf_refcount_level
; /* refcount btree levels */
521 * reserve some contiguous space for future logged fields before we add
522 * the unlogged fields. This makes the range logging via flags and
523 * structure offsets much simpler.
525 __be64 agf_spare64
[14];
527 /* unlogged fields, written during buffer writeback. */
528 __be64 agf_lsn
; /* last write sequence */
529 __be32 agf_crc
; /* crc of agf sector */
532 /* structure must be padded to 64 bit alignment */
535 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
537 #define XFS_AGF_MAGICNUM (1u << 0)
538 #define XFS_AGF_VERSIONNUM (1u << 1)
539 #define XFS_AGF_SEQNO (1u << 2)
540 #define XFS_AGF_LENGTH (1u << 3)
541 #define XFS_AGF_ROOTS (1u << 4)
542 #define XFS_AGF_LEVELS (1u << 5)
543 #define XFS_AGF_FLFIRST (1u << 6)
544 #define XFS_AGF_FLLAST (1u << 7)
545 #define XFS_AGF_FLCOUNT (1u << 8)
546 #define XFS_AGF_FREEBLKS (1u << 9)
547 #define XFS_AGF_LONGEST (1u << 10)
548 #define XFS_AGF_BTREEBLKS (1u << 11)
549 #define XFS_AGF_UUID (1u << 12)
550 #define XFS_AGF_RMAP_BLOCKS (1u << 13)
551 #define XFS_AGF_REFCOUNT_BLOCKS (1u << 14)
552 #define XFS_AGF_REFCOUNT_ROOT (1u << 15)
553 #define XFS_AGF_REFCOUNT_LEVEL (1u << 16)
554 #define XFS_AGF_SPARE64 (1u << 17)
555 #define XFS_AGF_NUM_BITS 18
556 #define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1)
558 #define XFS_AGF_FLAGS \
559 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
560 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
561 { XFS_AGF_SEQNO, "SEQNO" }, \
562 { XFS_AGF_LENGTH, "LENGTH" }, \
563 { XFS_AGF_ROOTS, "ROOTS" }, \
564 { XFS_AGF_LEVELS, "LEVELS" }, \
565 { XFS_AGF_FLFIRST, "FLFIRST" }, \
566 { XFS_AGF_FLLAST, "FLLAST" }, \
567 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
568 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
569 { XFS_AGF_LONGEST, "LONGEST" }, \
570 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
571 { XFS_AGF_UUID, "UUID" }, \
572 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
573 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
574 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
575 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
576 { XFS_AGF_SPARE64, "SPARE64" }
578 /* disk block (xfs_daddr_t) in the AG */
579 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
580 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
583 * Size of the unlinked inode hash table in the agi.
585 #define XFS_AGI_UNLINKED_BUCKETS 64
587 typedef struct xfs_agi
{
589 * Common allocation group header information
591 __be32 agi_magicnum
; /* magic number == XFS_AGI_MAGIC */
592 __be32 agi_versionnum
; /* header version == XFS_AGI_VERSION */
593 __be32 agi_seqno
; /* sequence # starting from 0 */
594 __be32 agi_length
; /* size in blocks of a.g. */
597 * Inodes are mapped by interpreting the inode number, so no
598 * mapping data is needed here.
600 __be32 agi_count
; /* count of allocated inodes */
601 __be32 agi_root
; /* root of inode btree */
602 __be32 agi_level
; /* levels in inode btree */
603 __be32 agi_freecount
; /* number of free inodes */
605 __be32 agi_newino
; /* new inode just allocated */
606 __be32 agi_dirino
; /* last directory inode chunk */
608 * Hash table of inodes which have been unlinked but are
609 * still being referenced.
611 __be32 agi_unlinked
[XFS_AGI_UNLINKED_BUCKETS
];
613 * This marks the end of logging region 1 and start of logging region 2.
615 uuid_t agi_uuid
; /* uuid of filesystem */
616 __be32 agi_crc
; /* crc of agi sector */
618 __be64 agi_lsn
; /* last write sequence */
620 __be32 agi_free_root
; /* root of the free inode btree */
621 __be32 agi_free_level
;/* levels in free inode btree */
623 __be32 agi_iblocks
; /* inobt blocks used */
624 __be32 agi_fblocks
; /* finobt blocks used */
626 /* structure must be padded to 64 bit alignment */
629 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
631 #define XFS_AGI_MAGICNUM (1u << 0)
632 #define XFS_AGI_VERSIONNUM (1u << 1)
633 #define XFS_AGI_SEQNO (1u << 2)
634 #define XFS_AGI_LENGTH (1u << 3)
635 #define XFS_AGI_COUNT (1u << 4)
636 #define XFS_AGI_ROOT (1u << 5)
637 #define XFS_AGI_LEVEL (1u << 6)
638 #define XFS_AGI_FREECOUNT (1u << 7)
639 #define XFS_AGI_NEWINO (1u << 8)
640 #define XFS_AGI_DIRINO (1u << 9)
641 #define XFS_AGI_UNLINKED (1u << 10)
642 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
643 #define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1)
644 #define XFS_AGI_FREE_ROOT (1u << 11)
645 #define XFS_AGI_FREE_LEVEL (1u << 12)
646 #define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */
647 #define XFS_AGI_NUM_BITS_R2 14
649 /* disk block (xfs_daddr_t) in the AG */
650 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
651 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
654 * The third a.g. block contains the a.g. freelist, an array
655 * of block pointers to blocks owned by the allocation btree code.
657 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
658 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
659 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr))
662 __be32 agfl_magicnum
;
667 } __attribute__((packed
));
669 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
671 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
672 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
673 #define XFS_FSB_TO_AGNO(mp,fsbno) \
674 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
675 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
676 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
677 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
678 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
679 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
680 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
683 * For checking for bad ranges of xfs_daddr_t's, covering multiple
684 * allocation groups or a single xfs_daddr_t that's a superblock copy.
686 #define XFS_AG_CHECK_DADDR(mp,d,len) \
688 ASSERT((d) == XFS_SB_DADDR || \
689 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
690 ASSERT(xfs_daddr_to_agno(mp, d) == \
691 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
697 * Traditional ondisk inode timestamps consist of signed 32-bit counters for
698 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
699 * 1970, which means that the timestamp epoch is the same as the Unix epoch.
700 * Therefore, the ondisk min and max defined here can be used directly to
701 * constrain the incore timestamps on a Unix system. Note that we actually
702 * encode a __be64 value on disk.
704 * When the bigtime feature is enabled, ondisk inode timestamps become an
705 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode
706 * timestamp epoch is the start of the classic timestamp range, which is
707 * Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers
708 * /must/ use the bigtime conversion functions when encoding and decoding raw
711 typedef __be64 xfs_timestamp_t
;
713 /* Legacy timestamp encoding format. */
714 struct xfs_legacy_timestamp
{
715 __be32 t_sec
; /* timestamp seconds */
716 __be32 t_nsec
; /* timestamp nanoseconds */
720 * Smallest possible ondisk seconds value with traditional timestamps. This
721 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
723 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
726 * Largest possible ondisk seconds value with traditional timestamps. This
727 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
729 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
732 * Smallest possible ondisk seconds value with bigtime timestamps. This
733 * corresponds (after conversion to a Unix timestamp) with the traditional
734 * minimum timestamp of Dec 13 20:45:52 UTC 1901.
736 #define XFS_BIGTIME_TIME_MIN ((int64_t)0)
739 * Largest supported ondisk seconds value with bigtime timestamps. This
740 * corresponds (after conversion to a Unix timestamp) with an incore timestamp
741 * of Jul 2 20:20:24 UTC 2486.
743 * We round down the ondisk limit so that the bigtime quota and inode max
744 * timestamps will be the same.
746 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
749 * Bigtime epoch is set exactly to the minimum time value that a traditional
750 * 32-bit timestamp can represent when using the Unix epoch as a reference.
751 * Hence the Unix epoch is at a fixed offset into the supported bigtime
754 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
755 * timestamp can represent so we will not lose any fidelity in converting
756 * to/from unix and bigtime timestamps.
758 * The following conversion factor converts a seconds counter from the Unix
759 * epoch to the bigtime epoch.
761 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN)
763 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */
764 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds
)
766 return (uint64_t)unix_seconds
+ XFS_BIGTIME_EPOCH_OFFSET
;
769 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */
770 static inline time64_t
xfs_bigtime_to_unix(uint64_t ondisk_seconds
)
772 return (time64_t
)ondisk_seconds
- XFS_BIGTIME_EPOCH_OFFSET
;
776 * On-disk inode structure.
778 * This is just the header or "dinode core", the inode is expanded to fill a
779 * variable size the leftover area split into a data and an attribute fork.
780 * The format of the data and attribute fork depends on the format of the
781 * inode as indicated by di_format and di_aformat. To access the data and
782 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
785 * There is a very similar struct xfs_log_dinode which matches the layout of
786 * this structure, but is kept in native format instead of big endian.
788 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
789 * padding field for v3 inodes.
791 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
793 __be16 di_magic
; /* inode magic # = XFS_DINODE_MAGIC */
794 __be16 di_mode
; /* mode and type of file */
795 __u8 di_version
; /* inode version */
796 __u8 di_format
; /* format of di_c data */
797 __be16 di_onlink
; /* old number of links to file */
798 __be32 di_uid
; /* owner's user id */
799 __be32 di_gid
; /* owner's group id */
800 __be32 di_nlink
; /* number of links to file */
801 __be16 di_projid_lo
; /* lower part of owner's project id */
802 __be16 di_projid_hi
; /* higher part owner's project id */
804 /* Number of data fork extents if NREXT64 is set */
805 __be64 di_big_nextents
;
807 /* Padding for V3 inodes without NREXT64 set. */
810 /* Padding and inode flush counter for V2 inodes. */
816 xfs_timestamp_t di_atime
; /* time last accessed */
817 xfs_timestamp_t di_mtime
; /* time last modified */
818 xfs_timestamp_t di_ctime
; /* time created/inode modified */
819 __be64 di_size
; /* number of bytes in file */
820 __be64 di_nblocks
; /* # of direct & btree blocks used */
821 __be32 di_extsize
; /* basic/minimum extent size for file */
824 * For V2 inodes and V3 inodes without NREXT64 set, this
825 * is the number of data and attr fork extents.
832 /* Number of attr fork extents if NREXT64 is set. */
834 __be32 di_big_anextents
;
835 __be16 di_nrext64_pad
;
838 __u8 di_forkoff
; /* attr fork offs, <<3 for 64b align */
839 __s8 di_aformat
; /* format of attr fork's data */
840 __be32 di_dmevmask
; /* DMIG event mask */
841 __be16 di_dmstate
; /* DMIG state info */
842 __be16 di_flags
; /* random flags, XFS_DIFLAG_... */
843 __be32 di_gen
; /* generation number */
845 /* di_next_unlinked is the only non-core field in the old dinode */
846 __be32 di_next_unlinked
;/* agi unlinked list ptr */
848 /* start of the extended dinode, writable fields */
849 __le32 di_crc
; /* CRC of the inode */
850 __be64 di_changecount
; /* number of attribute changes */
851 __be64 di_lsn
; /* flush sequence */
852 __be64 di_flags2
; /* more random flags */
853 __be32 di_cowextsize
; /* basic cow extent size for file */
854 __u8 di_pad2
[12]; /* more padding for future expansion */
856 /* fields only written to during inode creation */
857 xfs_timestamp_t di_crtime
; /* time created */
858 __be64 di_ino
; /* inode number */
859 uuid_t di_uuid
; /* UUID of the filesystem */
861 /* structure must be padded to 64 bit alignment */
864 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
866 #define DI_MAX_FLUSH 0xffff
869 * Size of the core inode on disk. Version 1 and 2 inodes have
870 * the same size, but version 3 has grown a few additional fields.
872 static inline uint
xfs_dinode_size(int version
)
875 return sizeof(struct xfs_dinode
);
876 return offsetof(struct xfs_dinode
, di_crc
);
880 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
881 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
883 #define XFS_MAXLINK ((1U << 31) - 1U)
886 * Values for di_format
888 * This enum is used in string mapping in xfs_trace.h; please keep the
889 * TRACE_DEFINE_ENUMs for it up to date.
891 enum xfs_dinode_fmt
{
892 XFS_DINODE_FMT_DEV
, /* xfs_dev_t */
893 XFS_DINODE_FMT_LOCAL
, /* bulk data */
894 XFS_DINODE_FMT_EXTENTS
, /* struct xfs_bmbt_rec */
895 XFS_DINODE_FMT_BTREE
, /* struct xfs_bmdr_block */
896 XFS_DINODE_FMT_UUID
/* added long ago, but never used */
899 #define XFS_INODE_FORMAT_STR \
900 { XFS_DINODE_FMT_DEV, "dev" }, \
901 { XFS_DINODE_FMT_LOCAL, "local" }, \
902 { XFS_DINODE_FMT_EXTENTS, "extent" }, \
903 { XFS_DINODE_FMT_BTREE, "btree" }, \
904 { XFS_DINODE_FMT_UUID, "uuid" }
907 * Max values for extnum and aextnum.
909 * The original on-disk extent counts were held in signed fields, resulting in
910 * maximum extent counts of 2^31 and 2^15 for the data and attr forks
911 * respectively. Similarly the maximum extent length is limited to 2^21 blocks
912 * by the 21-bit wide blockcount field of a BMBT extent record.
914 * The newly introduced data fork extent counter can hold a 64-bit value,
915 * however the maximum number of extents in a file is also limited to 2^54
916 * extents by the 54-bit wide startoff field of a BMBT extent record.
918 * It is further limited by the maximum supported file size of 2^63
919 * *bytes*. This leads to a maximum extent count for maximally sized filesystem
922 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks
924 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence
925 * 2^48 was chosen as the maximum data fork extent count.
927 * The maximum file size that can be represented by the data fork extent counter
928 * in the worst case occurs when all extents are 1 block in length and each
929 * block is 1KB in size.
931 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and
932 * with 1KB sized blocks, a file can reach upto,
935 * This is much larger than the theoretical maximum size of a directory
936 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB.
938 * Hence, a directory inode can never overflow its data fork extent counter.
940 #define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1))
941 #define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1))
942 #define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1))
943 #define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1))
946 * When we upgrade an inode to the large extent counts, the maximum value by
947 * which the extent count can increase is bound by the change in size of the
948 * on-disk field. No upgrade operation should ever be adding more than a few
949 * tens of extents, so if we get a really large value it is a sign of a code bug
952 #define XFS_MAX_EXTCNT_UPGRADE_NR \
953 min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \
954 XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL)
957 * Inode minimum and maximum sizes.
959 #define XFS_DINODE_MIN_LOG 8
960 #define XFS_DINODE_MAX_LOG 11
961 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
962 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
965 * Inode size for given fs.
967 #define XFS_DINODE_SIZE(mp) \
968 (xfs_has_v3inodes(mp) ? \
969 sizeof(struct xfs_dinode) : \
970 offsetof(struct xfs_dinode, di_crc))
971 #define XFS_LITINO(mp) \
972 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
975 * Inode data & attribute fork sizes, per inode.
977 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
979 #define XFS_DFORK_DSIZE(dip,mp) \
980 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
981 #define XFS_DFORK_ASIZE(dip,mp) \
982 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0)
983 #define XFS_DFORK_SIZE(dip,mp,w) \
984 ((w) == XFS_DATA_FORK ? \
985 XFS_DFORK_DSIZE(dip, mp) : \
986 XFS_DFORK_ASIZE(dip, mp))
988 #define XFS_DFORK_MAXEXT(dip, mp, w) \
989 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
992 * Return pointers to the data or attribute forks.
994 #define XFS_DFORK_DPTR(dip) \
995 ((char *)dip + xfs_dinode_size(dip->di_version))
996 #define XFS_DFORK_APTR(dip) \
997 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
998 #define XFS_DFORK_PTR(dip,w) \
999 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
1001 #define XFS_DFORK_FORMAT(dip,w) \
1002 ((w) == XFS_DATA_FORK ? \
1003 (dip)->di_format : \
1007 * For block and character special files the 32bit dev_t is stored at the
1008 * beginning of the data fork.
1010 static inline xfs_dev_t
xfs_dinode_get_rdev(struct xfs_dinode
*dip
)
1012 return be32_to_cpu(*(__be32
*)XFS_DFORK_DPTR(dip
));
1015 static inline void xfs_dinode_put_rdev(struct xfs_dinode
*dip
, xfs_dev_t rdev
)
1017 *(__be32
*)XFS_DFORK_DPTR(dip
) = cpu_to_be32(rdev
);
1021 * Values for di_flags
1023 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1024 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1025 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1026 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1027 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1028 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1029 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1030 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1031 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1032 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1033 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1034 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1035 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1036 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1037 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1038 /* Do not use bit 15, di_flags is legacy and unchanging now */
1040 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1041 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1042 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1043 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1044 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1045 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1046 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1047 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1048 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1049 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1050 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1051 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1052 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1053 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1054 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1056 #define XFS_DIFLAG_ANY \
1057 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1058 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1059 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1060 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1061 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1064 * Values for di_flags2 These start by being exposed to userspace in the upper
1065 * 16 bits of the XFS_XFLAG_s range.
1067 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1068 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1069 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1070 #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */
1071 #define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */
1073 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1074 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1075 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1076 #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT)
1077 #define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT)
1079 #define XFS_DIFLAG2_ANY \
1080 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
1081 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64)
1083 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode
*dip
)
1085 return dip
->di_version
>= 3 &&
1086 (dip
->di_flags2
& cpu_to_be64(XFS_DIFLAG2_BIGTIME
));
1089 static inline bool xfs_dinode_has_large_extent_counts(
1090 const struct xfs_dinode
*dip
)
1092 return dip
->di_version
>= 3 &&
1093 (dip
->di_flags2
& cpu_to_be64(XFS_DIFLAG2_NREXT64
));
1097 * Inode number format:
1098 * low inopblog bits - offset in block
1099 * next agblklog bits - block number in ag
1100 * next agno_log bits - ag number
1101 * high agno_log-agblklog-inopblog bits - 0
1103 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1104 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1105 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1106 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log)
1107 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1108 #define XFS_INO_BITS(mp) \
1109 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1110 #define XFS_INO_TO_AGNO(mp,i) \
1111 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1112 #define XFS_INO_TO_AGINO(mp,i) \
1113 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1114 #define XFS_INO_TO_AGBNO(mp,i) \
1115 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1116 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1117 #define XFS_INO_TO_OFFSET(mp,i) \
1118 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1119 #define XFS_INO_TO_FSB(mp,i) \
1120 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1121 #define XFS_AGINO_TO_INO(mp,a,i) \
1122 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1123 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1124 #define XFS_AGINO_TO_OFFSET(mp,i) \
1125 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1126 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1127 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1128 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1129 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1131 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1132 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1135 * RealTime Device format definitions
1138 /* Min and max rt extent sizes, specified in bytes */
1139 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1140 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1141 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1143 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1144 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1147 * RT bit manipulation macros.
1149 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1150 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1152 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
1153 #define XFS_RTHIBIT(w) xfs_highbit32(w)
1155 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
1158 * Dquot and dquot block format definitions
1160 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1161 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1163 #define XFS_DQTYPE_USER (1u << 0) /* user dquot record */
1164 #define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */
1165 #define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */
1166 #define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */
1168 /* bitmask to determine if this is a user/group/project dquot */
1169 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \
1173 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \
1180 * Traditional quota grace period expiration timers are an unsigned 32-bit
1181 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
1182 * Note that an expiration value of zero means that the quota limit has not
1183 * been reached, and therefore no expiration has been set. Therefore, the
1184 * ondisk min and max defined here can be used directly to constrain the incore
1185 * quota expiration timestamps on a Unix system.
1187 * When bigtime is enabled, we trade two bits of precision to expand the
1188 * expiration timeout range to match that of big inode timestamps. The min and
1189 * max recorded here are the on-disk limits, not a Unix timestamp.
1191 * The grace period for each quota type is stored in the root dquot (id = 0)
1192 * and is applied to a non-root dquot when it exceeds the soft or hard limits.
1193 * The length of quota grace periods are unsigned 32-bit quantities measured in
1194 * units of seconds. A value of zero means to use the default period.
1198 * Smallest possible ondisk quota expiration value with traditional timestamps.
1199 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
1201 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
1204 * Largest possible ondisk quota expiration value with traditional timestamps.
1205 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
1207 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
1210 * Smallest possible ondisk quota expiration value with bigtime timestamps.
1211 * This corresponds (after conversion to a Unix timestamp) with the incore
1212 * expiration of Jan 1 00:00:04 UTC 1970.
1214 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN)
1217 * Largest supported ondisk quota expiration value with bigtime timestamps.
1218 * This corresponds (after conversion to a Unix timestamp) with an incore
1219 * expiration of Jul 2 20:20:24 UTC 2486.
1221 * The ondisk field supports values up to -1U, which corresponds to an incore
1222 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp,
1223 * so we cap the maximum bigtime quota expiration to the max inode timestamp.
1225 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U)
1228 * The following conversion factors assist in converting a quota expiration
1229 * timestamp between the incore and ondisk formats.
1231 #define XFS_DQ_BIGTIME_SHIFT (2)
1232 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
1234 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
1235 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds
)
1238 * Round the expiration timestamp up to the nearest bigtime timestamp
1239 * that we can store, to give users the most time to fix problems.
1241 return ((uint64_t)unix_seconds
+ XFS_DQ_BIGTIME_SLACK
) >>
1242 XFS_DQ_BIGTIME_SHIFT
;
1245 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
1246 static inline time64_t
xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds
)
1248 return (time64_t
)ondisk_seconds
<< XFS_DQ_BIGTIME_SHIFT
;
1252 * Default quota grace periods, ranging from zero (use the compiled defaults)
1253 * to ~136 years. These are applied to a non-root dquot that has exceeded
1256 #define XFS_DQ_GRACE_MIN ((int64_t)0)
1257 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX)
1260 * This is the main portion of the on-disk representation of quota information
1261 * for a user. We pad this with some more expansion room to construct the on
1264 struct xfs_disk_dquot
{
1265 __be16 d_magic
; /* dquot magic = XFS_DQUOT_MAGIC */
1266 __u8 d_version
; /* dquot version */
1267 __u8 d_type
; /* XFS_DQTYPE_USER/PROJ/GROUP */
1268 __be32 d_id
; /* user,project,group id */
1269 __be64 d_blk_hardlimit
;/* absolute limit on disk blks */
1270 __be64 d_blk_softlimit
;/* preferred limit on disk blks */
1271 __be64 d_ino_hardlimit
;/* maximum # allocated inodes */
1272 __be64 d_ino_softlimit
;/* preferred inode limit */
1273 __be64 d_bcount
; /* disk blocks owned by the user */
1274 __be64 d_icount
; /* inodes owned by the user */
1275 __be32 d_itimer
; /* zero if within inode limits if not,
1276 this is when we refuse service */
1277 __be32 d_btimer
; /* similar to above; for disk blocks */
1278 __be16 d_iwarns
; /* warnings issued wrt num inodes */
1279 __be16 d_bwarns
; /* warnings issued wrt disk blocks */
1280 __be32 d_pad0
; /* 64 bit align */
1281 __be64 d_rtb_hardlimit
;/* absolute limit on realtime blks */
1282 __be64 d_rtb_softlimit
;/* preferred limit on RT disk blks */
1283 __be64 d_rtbcount
; /* realtime blocks owned */
1284 __be32 d_rtbtimer
; /* similar to above; for RT disk blocks */
1285 __be16 d_rtbwarns
; /* warnings issued wrt RT disk blocks */
1290 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1291 * carrying the unnecessary padding would be a waste of memory.
1294 struct xfs_disk_dquot dd_diskdq
; /* portion living incore as well */
1295 char dd_fill
[4];/* filling for posterity */
1298 * These two are only present on filesystems with the CRC bits set.
1300 __be32 dd_crc
; /* checksum */
1301 __be64 dd_lsn
; /* last modification in log */
1302 uuid_t dd_uuid
; /* location information */
1305 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1308 * This defines the unit of allocation of dquots.
1310 * Currently, it is just one file system block, and a 4K blk contains 30
1311 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
1312 * this more dynamic.
1314 * However, if this number is changed, we have to make sure that we don't
1315 * implicitly assume that we do allocations in chunks of a single filesystem
1316 * block in the dquot/xqm code.
1318 * This is part of the ondisk format because the structure size is not a power
1319 * of two, which leaves slack at the end of the disk block.
1321 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
1324 * Remote symlink format and access functions.
1326 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1328 struct xfs_dsymlink_hdr
{
1339 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1341 #define XFS_SYMLINK_MAXLEN 1024
1343 * The maximum pathlen is 1024 bytes. Since the minimum file system
1344 * blocksize is 512 bytes, we can get a max of 3 extents back from
1345 * bmapi when crc headers are taken into account.
1347 #define XFS_SYMLINK_MAPS 3
1349 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1350 ((bufsize) - (xfs_has_crc((mp)) ? \
1351 sizeof(struct xfs_dsymlink_hdr) : 0))
1355 * Allocation Btree format definitions
1357 * There are two on-disk btrees, one sorted by blockno and one sorted
1358 * by blockcount and blockno. All blocks look the same to make the code
1359 * simpler; if we have time later, we'll make the optimizations.
1361 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1362 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1363 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1364 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1367 * Data record/key structure
1369 typedef struct xfs_alloc_rec
{
1370 __be32 ar_startblock
; /* starting block number */
1371 __be32 ar_blockcount
; /* count of free blocks */
1372 } xfs_alloc_rec_t
, xfs_alloc_key_t
;
1374 typedef struct xfs_alloc_rec_incore
{
1375 xfs_agblock_t ar_startblock
; /* starting block number */
1376 xfs_extlen_t ar_blockcount
; /* count of free blocks */
1377 } xfs_alloc_rec_incore_t
;
1379 /* btree pointer type */
1380 typedef __be32 xfs_alloc_ptr_t
;
1383 * Block numbers in the AG:
1384 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1386 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1387 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1391 * Inode Allocation Btree format definitions
1393 * There is a btree for the inode map per allocation group.
1395 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1396 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1397 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1398 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1400 typedef uint64_t xfs_inofree_t
;
1401 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1402 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1403 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1404 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1406 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1407 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1408 #define XFS_INODES_PER_HOLEMASK_BIT \
1409 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1411 static inline xfs_inofree_t
xfs_inobt_maskn(int i
, int n
)
1413 return ((n
>= XFS_INODES_PER_CHUNK
? 0 : XFS_INOBT_MASK(n
)) - 1) << i
;
1417 * The on-disk inode record structure has two formats. The original "full"
1418 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1419 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1422 * The holemask of the sparse record format allows an inode chunk to have holes
1423 * that refer to blocks not owned by the inode record. This facilitates inode
1424 * allocation in the event of severe free space fragmentation.
1426 typedef struct xfs_inobt_rec
{
1427 __be32 ir_startino
; /* starting inode number */
1430 __be32 ir_freecount
; /* count of free inodes */
1433 __be16 ir_holemask
;/* hole mask for sparse chunks */
1434 __u8 ir_count
; /* total inode count */
1435 __u8 ir_freecount
; /* count of free inodes */
1438 __be64 ir_free
; /* free inode mask */
1441 typedef struct xfs_inobt_rec_incore
{
1442 xfs_agino_t ir_startino
; /* starting inode number */
1443 uint16_t ir_holemask
; /* hole mask for sparse chunks */
1444 uint8_t ir_count
; /* total inode count */
1445 uint8_t ir_freecount
; /* count of free inodes (set bits) */
1446 xfs_inofree_t ir_free
; /* free inode mask */
1447 } xfs_inobt_rec_incore_t
;
1449 static inline bool xfs_inobt_issparse(uint16_t holemask
)
1451 /* non-zero holemask represents a sparse rec. */
1458 typedef struct xfs_inobt_key
{
1459 __be32 ir_startino
; /* starting inode number */
1462 /* btree pointer type */
1463 typedef __be32 xfs_inobt_ptr_t
;
1466 * block numbers in the AG.
1468 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1469 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1472 * Reverse mapping btree format definitions
1474 * There is a btree for the reverse map per allocation group
1476 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1479 * Ownership info for an extent. This is used to create reverse-mapping
1482 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1483 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1484 struct xfs_owner_info
{
1486 xfs_fileoff_t oi_offset
;
1487 unsigned int oi_flags
;
1491 * Special owner types.
1493 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1494 * to tell us we have a special owner value. We use these for static metadata
1495 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1497 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1498 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1499 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1500 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1501 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1502 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1503 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1504 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1505 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1506 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1508 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1511 * Data record structure
1513 struct xfs_rmap_rec
{
1514 __be32 rm_startblock
; /* extent start block */
1515 __be32 rm_blockcount
; /* extent length */
1516 __be64 rm_owner
; /* extent owner */
1517 __be64 rm_offset
; /* offset within the owner */
1522 * rm_offset:63 is the attribute fork flag
1523 * rm_offset:62 is the bmbt block flag
1524 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1525 * rm_offset:54-60 aren't used and should be zero
1526 * rm_offset:0-53 is the block offset within the inode
1528 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1529 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1530 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1532 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1533 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1534 XFS_RMAP_OFF_BMBT_BLOCK | \
1535 XFS_RMAP_OFF_UNWRITTEN)
1536 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1538 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1540 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1541 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1542 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1544 #define RMAPBT_STARTBLOCK_BITLEN 32
1545 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1546 #define RMAPBT_OWNER_BITLEN 64
1547 #define RMAPBT_ATTRFLAG_BITLEN 1
1548 #define RMAPBT_BMBTFLAG_BITLEN 1
1549 #define RMAPBT_EXNTFLAG_BITLEN 1
1550 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1551 #define RMAPBT_OFFSET_BITLEN 54
1556 * We don't use the length for lookups
1558 struct xfs_rmap_key
{
1559 __be32 rm_startblock
; /* extent start block */
1560 __be64 rm_owner
; /* extent owner */
1561 __be64 rm_offset
; /* offset within the owner */
1562 } __attribute__((packed
));
1564 /* btree pointer type */
1565 typedef __be32 xfs_rmap_ptr_t
;
1567 #define XFS_RMAP_BLOCK(mp) \
1568 (xfs_has_finobt(((mp))) ? \
1569 XFS_FIBT_BLOCK(mp) + 1 : \
1570 XFS_IBT_BLOCK(mp) + 1)
1573 * Reference Count Btree format definitions
1576 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1578 unsigned int xfs_refc_block(struct xfs_mount
*mp
);
1581 * Data record/key structure
1583 * Each record associates a range of physical blocks (starting at
1584 * rc_startblock and ending rc_blockcount blocks later) with a reference
1585 * count (rc_refcount). Extents that are being used to stage a copy on
1586 * write (CoW) operation are recorded in the refcount btree with a
1587 * refcount of 1. All other records must have a refcount > 1 and must
1588 * track an extent mapped only by file data forks.
1590 * Extents with a single owner (attributes, metadata, non-shared file
1591 * data) are not tracked here. Free space is also not tracked here.
1592 * This is consistent with pre-reflink XFS.
1596 * Extents that are being used to stage a copy on write are stored
1597 * in the refcount btree with a refcount of 1 and the upper bit set
1598 * on the startblock. This speeds up mount time deletion of stale
1599 * staging extents because they're all at the right side of the tree.
1601 #define XFS_REFC_COWFLAG (1U << 31)
1602 #define REFCNTBT_COWFLAG_BITLEN 1
1603 #define REFCNTBT_AGBLOCK_BITLEN 31
1605 struct xfs_refcount_rec
{
1606 __be32 rc_startblock
; /* starting block number */
1607 __be32 rc_blockcount
; /* count of blocks */
1608 __be32 rc_refcount
; /* number of inodes linked here */
1611 struct xfs_refcount_key
{
1612 __be32 rc_startblock
; /* starting block number */
1615 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1616 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1618 /* btree pointer type */
1619 typedef __be32 xfs_refcount_ptr_t
;
1623 * BMAP Btree format definitions
1625 * This includes both the root block definition that sits inside an inode fork
1626 * and the record/pointer formats for the leaf/node in the blocks.
1628 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1629 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1632 * Bmap root header, on-disk form only.
1634 typedef struct xfs_bmdr_block
{
1635 __be16 bb_level
; /* 0 is a leaf */
1636 __be16 bb_numrecs
; /* current # of data records */
1640 * Bmap btree record and extent descriptor.
1641 * l0:63 is an extent flag (value 1 indicates non-normal).
1642 * l0:9-62 are startoff.
1643 * l0:0-8 and l1:21-63 are startblock.
1644 * l1:0-20 are blockcount.
1646 #define BMBT_EXNTFLAG_BITLEN 1
1647 #define BMBT_STARTOFF_BITLEN 54
1648 #define BMBT_STARTBLOCK_BITLEN 52
1649 #define BMBT_BLOCKCOUNT_BITLEN 21
1651 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
1652 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
1654 #define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
1657 * bmbt records have a file offset (block) field that is 54 bits wide, so this
1658 * is the largest xfs_fileoff_t that we ever expect to see.
1660 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
1662 typedef struct xfs_bmbt_rec
{
1666 typedef uint64_t xfs_bmbt_rec_base_t
; /* use this for casts */
1667 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t
;
1670 * Values and macros for delayed-allocation startblock fields.
1672 #define STARTBLOCKVALBITS 17
1673 #define STARTBLOCKMASKBITS (15 + 20)
1674 #define STARTBLOCKMASK \
1675 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1677 static inline int isnullstartblock(xfs_fsblock_t x
)
1679 return ((x
) & STARTBLOCKMASK
) == STARTBLOCKMASK
;
1682 static inline xfs_fsblock_t
nullstartblock(int k
)
1684 ASSERT(k
< (1 << STARTBLOCKVALBITS
));
1685 return STARTBLOCKMASK
| (k
);
1688 static inline xfs_filblks_t
startblockval(xfs_fsblock_t x
)
1690 return (xfs_filblks_t
)((x
) & ~STARTBLOCKMASK
);
1694 * Key structure for non-leaf levels of the tree.
1696 typedef struct xfs_bmbt_key
{
1697 __be64 br_startoff
; /* starting file offset */
1698 } xfs_bmbt_key_t
, xfs_bmdr_key_t
;
1700 /* btree pointer type */
1701 typedef __be64 xfs_bmbt_ptr_t
, xfs_bmdr_ptr_t
;
1705 * Generic Btree block format definitions
1707 * This is a combination of the actual format used on disk for short and long
1708 * format btrees. The first three fields are shared by both format, but the
1709 * pointers are different and should be used with care.
1711 * To get the size of the actual short or long form headers please use the size
1712 * macros below. Never use sizeof(xfs_btree_block).
1714 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1715 * with the crc feature bit, and all accesses to them must be conditional on
1718 /* short form block header */
1719 struct xfs_btree_block_shdr
{
1730 /* long form block header */
1731 struct xfs_btree_block_lhdr
{
1740 __be32 bb_pad
; /* padding for alignment */
1743 struct xfs_btree_block
{
1744 __be32 bb_magic
; /* magic number for block type */
1745 __be16 bb_level
; /* 0 is a leaf */
1746 __be16 bb_numrecs
; /* current # of data records */
1748 struct xfs_btree_block_shdr s
;
1749 struct xfs_btree_block_lhdr l
;
1753 /* size of a short form block */
1754 #define XFS_BTREE_SBLOCK_LEN \
1755 (offsetof(struct xfs_btree_block, bb_u) + \
1756 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1757 /* size of a long form block */
1758 #define XFS_BTREE_LBLOCK_LEN \
1759 (offsetof(struct xfs_btree_block, bb_u) + \
1760 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1762 /* sizes of CRC enabled btree blocks */
1763 #define XFS_BTREE_SBLOCK_CRC_LEN \
1764 (offsetof(struct xfs_btree_block, bb_u) + \
1765 sizeof(struct xfs_btree_block_shdr))
1766 #define XFS_BTREE_LBLOCK_CRC_LEN \
1767 (offsetof(struct xfs_btree_block, bb_u) + \
1768 sizeof(struct xfs_btree_block_lhdr))
1770 #define XFS_BTREE_SBLOCK_CRC_OFF \
1771 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1772 #define XFS_BTREE_LBLOCK_CRC_OFF \
1773 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1776 * On-disk XFS access control list structure.
1778 struct xfs_acl_entry
{
1782 __be16 ae_pad
; /* fill the implicit hole in the structure */
1787 struct xfs_acl_entry acl_entry
[];
1791 * The number of ACL entries allowed is defined by the on-disk format.
1792 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1793 * limited only by the maximum size of the xattr that stores the information.
1795 #define XFS_ACL_MAX_ENTRIES(mp) \
1797 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1798 sizeof(struct xfs_acl_entry) \
1801 #define XFS_ACL_SIZE(cnt) \
1802 (sizeof(struct xfs_acl) + \
1803 sizeof(struct xfs_acl_entry) * cnt)
1805 #define XFS_ACL_MAX_SIZE(mp) \
1806 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1809 /* On-disk XFS extended attribute names */
1810 #define SGI_ACL_FILE "SGI_ACL_FILE"
1811 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1812 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1813 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1815 #endif /* __XFS_FORMAT_H__ */