2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #ifndef __XFS_FORMAT_H__
19 #define __XFS_FORMAT_H__
22 * XFS On Disk Format Definitions
24 * This header file defines all the on-disk format definitions for
25 * general XFS objects. Directory and attribute related objects are defined in
26 * xfs_da_format.h, which log and log item formats are defined in
27 * xfs_log_format.h. Everything else goes here.
38 * Fits into a sector-sized buffer at address 0 of each allocation group.
39 * Only the first of these is ever updated except during growfs.
41 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
42 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
43 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
44 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
45 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
46 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
47 #define XFS_SB_VERSION_NUMBITS 0x000f
48 #define XFS_SB_VERSION_ALLFBITS 0xfff0
49 #define XFS_SB_VERSION_ATTRBIT 0x0010
50 #define XFS_SB_VERSION_NLINKBIT 0x0020
51 #define XFS_SB_VERSION_QUOTABIT 0x0040
52 #define XFS_SB_VERSION_ALIGNBIT 0x0080
53 #define XFS_SB_VERSION_DALIGNBIT 0x0100
54 #define XFS_SB_VERSION_SHAREDBIT 0x0200
55 #define XFS_SB_VERSION_LOGV2BIT 0x0400
56 #define XFS_SB_VERSION_SECTORBIT 0x0800
57 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
58 #define XFS_SB_VERSION_DIRV2BIT 0x2000
59 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
60 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
63 * The size of a single extended attribute on disk is limited by
64 * the size of index values within the attribute entries themselves.
65 * These are be16 fields, so we can only support attribute data
66 * sizes up to 2^16 bytes in length.
68 #define XFS_XATTR_SIZE_MAX (1 << 16)
71 * Supported feature bit list is just all bits in the versionnum field because
72 * we've used them all up and understand them all. Except, of course, for the
73 * shared superblock bit, which nobody knows what it does and so is unsupported.
75 #define XFS_SB_VERSION_OKBITS \
76 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
77 ~XFS_SB_VERSION_SHAREDBIT)
80 * There are two words to hold XFS "feature" bits: the original
81 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
82 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
84 * These defines represent bits in sb_features2.
86 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
87 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
88 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
89 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
90 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
91 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
92 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
93 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
95 #define XFS_SB_VERSION2_OKBITS \
96 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
97 XFS_SB_VERSION2_ATTR2BIT | \
98 XFS_SB_VERSION2_PROJID32BIT | \
99 XFS_SB_VERSION2_FTYPE)
102 * Superblock - in core version. Must match the ondisk version below.
103 * Must be padded to 64 bit alignment.
105 typedef struct xfs_sb
{
106 uint32_t sb_magicnum
; /* magic number == XFS_SB_MAGIC */
107 uint32_t sb_blocksize
; /* logical block size, bytes */
108 xfs_rfsblock_t sb_dblocks
; /* number of data blocks */
109 xfs_rfsblock_t sb_rblocks
; /* number of realtime blocks */
110 xfs_rtblock_t sb_rextents
; /* number of realtime extents */
111 uuid_t sb_uuid
; /* user-visible file system unique id */
112 xfs_fsblock_t sb_logstart
; /* starting block of log if internal */
113 xfs_ino_t sb_rootino
; /* root inode number */
114 xfs_ino_t sb_rbmino
; /* bitmap inode for realtime extents */
115 xfs_ino_t sb_rsumino
; /* summary inode for rt bitmap */
116 xfs_agblock_t sb_rextsize
; /* realtime extent size, blocks */
117 xfs_agblock_t sb_agblocks
; /* size of an allocation group */
118 xfs_agnumber_t sb_agcount
; /* number of allocation groups */
119 xfs_extlen_t sb_rbmblocks
; /* number of rt bitmap blocks */
120 xfs_extlen_t sb_logblocks
; /* number of log blocks */
121 uint16_t sb_versionnum
; /* header version == XFS_SB_VERSION */
122 uint16_t sb_sectsize
; /* volume sector size, bytes */
123 uint16_t sb_inodesize
; /* inode size, bytes */
124 uint16_t sb_inopblock
; /* inodes per block */
125 char sb_fname
[12]; /* file system name */
126 uint8_t sb_blocklog
; /* log2 of sb_blocksize */
127 uint8_t sb_sectlog
; /* log2 of sb_sectsize */
128 uint8_t sb_inodelog
; /* log2 of sb_inodesize */
129 uint8_t sb_inopblog
; /* log2 of sb_inopblock */
130 uint8_t sb_agblklog
; /* log2 of sb_agblocks (rounded up) */
131 uint8_t sb_rextslog
; /* log2 of sb_rextents */
132 uint8_t sb_inprogress
; /* mkfs is in progress, don't mount */
133 uint8_t sb_imax_pct
; /* max % of fs for inode space */
136 * These fields must remain contiguous. If you really
137 * want to change their layout, make sure you fix the
138 * code in xfs_trans_apply_sb_deltas().
140 uint64_t sb_icount
; /* allocated inodes */
141 uint64_t sb_ifree
; /* free inodes */
142 uint64_t sb_fdblocks
; /* free data blocks */
143 uint64_t sb_frextents
; /* free realtime extents */
145 * End contiguous fields.
147 xfs_ino_t sb_uquotino
; /* user quota inode */
148 xfs_ino_t sb_gquotino
; /* group quota inode */
149 uint16_t sb_qflags
; /* quota flags */
150 uint8_t sb_flags
; /* misc. flags */
151 uint8_t sb_shared_vn
; /* shared version number */
152 xfs_extlen_t sb_inoalignmt
; /* inode chunk alignment, fsblocks */
153 uint32_t sb_unit
; /* stripe or raid unit */
154 uint32_t sb_width
; /* stripe or raid width */
155 uint8_t sb_dirblklog
; /* log2 of dir block size (fsbs) */
156 uint8_t sb_logsectlog
; /* log2 of the log sector size */
157 uint16_t sb_logsectsize
; /* sector size for the log, bytes */
158 uint32_t sb_logsunit
; /* stripe unit size for the log */
159 uint32_t sb_features2
; /* additional feature bits */
162 * bad features2 field as a result of failing to pad the sb structure to
163 * 64 bits. Some machines will be using this field for features2 bits.
164 * Easiest just to mark it bad and not use it for anything else.
166 * This is not kept up to date in memory; it is always overwritten by
167 * the value in sb_features2 when formatting the incore superblock to
170 uint32_t sb_bad_features2
;
172 /* version 5 superblock fields start here */
175 uint32_t sb_features_compat
;
176 uint32_t sb_features_ro_compat
;
177 uint32_t sb_features_incompat
;
178 uint32_t sb_features_log_incompat
;
180 uint32_t sb_crc
; /* superblock crc */
181 xfs_extlen_t sb_spino_align
; /* sparse inode chunk alignment */
183 xfs_ino_t sb_pquotino
; /* project quota inode */
184 xfs_lsn_t sb_lsn
; /* last write sequence */
185 uuid_t sb_meta_uuid
; /* metadata file system unique id */
187 /* must be padded to 64 bit alignment */
190 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
193 * Superblock - on disk version. Must match the in core version above.
194 * Must be padded to 64 bit alignment.
196 typedef struct xfs_dsb
{
197 __be32 sb_magicnum
; /* magic number == XFS_SB_MAGIC */
198 __be32 sb_blocksize
; /* logical block size, bytes */
199 __be64 sb_dblocks
; /* number of data blocks */
200 __be64 sb_rblocks
; /* number of realtime blocks */
201 __be64 sb_rextents
; /* number of realtime extents */
202 uuid_t sb_uuid
; /* user-visible file system unique id */
203 __be64 sb_logstart
; /* starting block of log if internal */
204 __be64 sb_rootino
; /* root inode number */
205 __be64 sb_rbmino
; /* bitmap inode for realtime extents */
206 __be64 sb_rsumino
; /* summary inode for rt bitmap */
207 __be32 sb_rextsize
; /* realtime extent size, blocks */
208 __be32 sb_agblocks
; /* size of an allocation group */
209 __be32 sb_agcount
; /* number of allocation groups */
210 __be32 sb_rbmblocks
; /* number of rt bitmap blocks */
211 __be32 sb_logblocks
; /* number of log blocks */
212 __be16 sb_versionnum
; /* header version == XFS_SB_VERSION */
213 __be16 sb_sectsize
; /* volume sector size, bytes */
214 __be16 sb_inodesize
; /* inode size, bytes */
215 __be16 sb_inopblock
; /* inodes per block */
216 char sb_fname
[12]; /* file system name */
217 __u8 sb_blocklog
; /* log2 of sb_blocksize */
218 __u8 sb_sectlog
; /* log2 of sb_sectsize */
219 __u8 sb_inodelog
; /* log2 of sb_inodesize */
220 __u8 sb_inopblog
; /* log2 of sb_inopblock */
221 __u8 sb_agblklog
; /* log2 of sb_agblocks (rounded up) */
222 __u8 sb_rextslog
; /* log2 of sb_rextents */
223 __u8 sb_inprogress
; /* mkfs is in progress, don't mount */
224 __u8 sb_imax_pct
; /* max % of fs for inode space */
227 * These fields must remain contiguous. If you really
228 * want to change their layout, make sure you fix the
229 * code in xfs_trans_apply_sb_deltas().
231 __be64 sb_icount
; /* allocated inodes */
232 __be64 sb_ifree
; /* free inodes */
233 __be64 sb_fdblocks
; /* free data blocks */
234 __be64 sb_frextents
; /* free realtime extents */
236 * End contiguous fields.
238 __be64 sb_uquotino
; /* user quota inode */
239 __be64 sb_gquotino
; /* group quota inode */
240 __be16 sb_qflags
; /* quota flags */
241 __u8 sb_flags
; /* misc. flags */
242 __u8 sb_shared_vn
; /* shared version number */
243 __be32 sb_inoalignmt
; /* inode chunk alignment, fsblocks */
244 __be32 sb_unit
; /* stripe or raid unit */
245 __be32 sb_width
; /* stripe or raid width */
246 __u8 sb_dirblklog
; /* log2 of dir block size (fsbs) */
247 __u8 sb_logsectlog
; /* log2 of the log sector size */
248 __be16 sb_logsectsize
; /* sector size for the log, bytes */
249 __be32 sb_logsunit
; /* stripe unit size for the log */
250 __be32 sb_features2
; /* additional feature bits */
252 * bad features2 field as a result of failing to pad the sb
253 * structure to 64 bits. Some machines will be using this field
254 * for features2 bits. Easiest just to mark it bad and not use
255 * it for anything else.
257 __be32 sb_bad_features2
;
259 /* version 5 superblock fields start here */
262 __be32 sb_features_compat
;
263 __be32 sb_features_ro_compat
;
264 __be32 sb_features_incompat
;
265 __be32 sb_features_log_incompat
;
267 __le32 sb_crc
; /* superblock crc */
268 __be32 sb_spino_align
; /* sparse inode chunk alignment */
270 __be64 sb_pquotino
; /* project quota inode */
271 __be64 sb_lsn
; /* last write sequence */
272 uuid_t sb_meta_uuid
; /* metadata file system unique id */
274 /* must be padded to 64 bit alignment */
279 * Misc. Flags - warning - these will be cleared by xfs_repair unless
280 * a feature bit is set when the flag is used.
282 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
283 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
286 * define max. shared version we can interoperate with
288 #define XFS_SB_MAX_SHARED_VN 0
290 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
293 * The first XFS version we support is a v4 superblock with V2 directories.
295 static inline bool xfs_sb_good_v4_features(struct xfs_sb
*sbp
)
297 if (!(sbp
->sb_versionnum
& XFS_SB_VERSION_DIRV2BIT
))
300 /* check for unknown features in the fs */
301 if ((sbp
->sb_versionnum
& ~XFS_SB_VERSION_OKBITS
) ||
302 ((sbp
->sb_versionnum
& XFS_SB_VERSION_MOREBITSBIT
) &&
303 (sbp
->sb_features2
& ~XFS_SB_VERSION2_OKBITS
)))
309 static inline bool xfs_sb_good_version(struct xfs_sb
*sbp
)
311 if (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
)
313 if (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_4
)
314 return xfs_sb_good_v4_features(sbp
);
318 static inline bool xfs_sb_version_hasrealtime(struct xfs_sb
*sbp
)
320 return sbp
->sb_rblocks
> 0;
324 * Detect a mismatched features2 field. Older kernels read/wrote
325 * this into the wrong slot, so to be safe we keep them in sync.
327 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb
*sbp
)
329 return sbp
->sb_bad_features2
!= sbp
->sb_features2
;
332 static inline bool xfs_sb_version_hasattr(struct xfs_sb
*sbp
)
334 return (sbp
->sb_versionnum
& XFS_SB_VERSION_ATTRBIT
);
337 static inline void xfs_sb_version_addattr(struct xfs_sb
*sbp
)
339 sbp
->sb_versionnum
|= XFS_SB_VERSION_ATTRBIT
;
342 static inline bool xfs_sb_version_hasquota(struct xfs_sb
*sbp
)
344 return (sbp
->sb_versionnum
& XFS_SB_VERSION_QUOTABIT
);
347 static inline void xfs_sb_version_addquota(struct xfs_sb
*sbp
)
349 sbp
->sb_versionnum
|= XFS_SB_VERSION_QUOTABIT
;
352 static inline bool xfs_sb_version_hasalign(struct xfs_sb
*sbp
)
354 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
||
355 (sbp
->sb_versionnum
& XFS_SB_VERSION_ALIGNBIT
));
358 static inline bool xfs_sb_version_hasdalign(struct xfs_sb
*sbp
)
360 return (sbp
->sb_versionnum
& XFS_SB_VERSION_DALIGNBIT
);
363 static inline bool xfs_sb_version_haslogv2(struct xfs_sb
*sbp
)
365 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
||
366 (sbp
->sb_versionnum
& XFS_SB_VERSION_LOGV2BIT
);
369 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb
*sbp
)
371 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
||
372 (sbp
->sb_versionnum
& XFS_SB_VERSION_EXTFLGBIT
);
375 static inline bool xfs_sb_version_hassector(struct xfs_sb
*sbp
)
377 return (sbp
->sb_versionnum
& XFS_SB_VERSION_SECTORBIT
);
380 static inline bool xfs_sb_version_hasasciici(struct xfs_sb
*sbp
)
382 return (sbp
->sb_versionnum
& XFS_SB_VERSION_BORGBIT
);
385 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb
*sbp
)
387 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
||
388 (sbp
->sb_versionnum
& XFS_SB_VERSION_MOREBITSBIT
);
392 * sb_features2 bit version macros.
394 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb
*sbp
)
396 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) ||
397 (xfs_sb_version_hasmorebits(sbp
) &&
398 (sbp
->sb_features2
& XFS_SB_VERSION2_LAZYSBCOUNTBIT
));
401 static inline bool xfs_sb_version_hasattr2(struct xfs_sb
*sbp
)
403 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) ||
404 (xfs_sb_version_hasmorebits(sbp
) &&
405 (sbp
->sb_features2
& XFS_SB_VERSION2_ATTR2BIT
));
408 static inline void xfs_sb_version_addattr2(struct xfs_sb
*sbp
)
410 sbp
->sb_versionnum
|= XFS_SB_VERSION_MOREBITSBIT
;
411 sbp
->sb_features2
|= XFS_SB_VERSION2_ATTR2BIT
;
414 static inline void xfs_sb_version_removeattr2(struct xfs_sb
*sbp
)
416 sbp
->sb_features2
&= ~XFS_SB_VERSION2_ATTR2BIT
;
417 if (!sbp
->sb_features2
)
418 sbp
->sb_versionnum
&= ~XFS_SB_VERSION_MOREBITSBIT
;
421 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb
*sbp
)
423 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) ||
424 (xfs_sb_version_hasmorebits(sbp
) &&
425 (sbp
->sb_features2
& XFS_SB_VERSION2_PROJID32BIT
));
428 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb
*sbp
)
430 sbp
->sb_versionnum
|= XFS_SB_VERSION_MOREBITSBIT
;
431 sbp
->sb_features2
|= XFS_SB_VERSION2_PROJID32BIT
;
435 * Extended v5 superblock feature masks. These are to be used for new v5
436 * superblock features only.
438 * Compat features are new features that old kernels will not notice or affect
439 * and so can mount read-write without issues.
441 * RO-Compat (read only) are features that old kernels can read but will break
442 * if they write. Hence only read-only mounts of such filesystems are allowed on
443 * kernels that don't support the feature bit.
445 * InCompat features are features which old kernels will not understand and so
448 * Log-InCompat features are for changes to log formats or new transactions that
449 * can't be replayed on older kernels. The fields are set when the filesystem is
450 * mounted, and a clean unmount clears the fields.
452 #define XFS_SB_FEAT_COMPAT_ALL 0
453 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
455 xfs_sb_has_compat_feature(
459 return (sbp
->sb_features_compat
& feature
) != 0;
462 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
463 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
464 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
465 #define XFS_SB_FEAT_RO_COMPAT_ALL \
466 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
467 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
468 XFS_SB_FEAT_RO_COMPAT_REFLINK)
469 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
471 xfs_sb_has_ro_compat_feature(
475 return (sbp
->sb_features_ro_compat
& feature
) != 0;
478 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
479 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
480 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
481 #define XFS_SB_FEAT_INCOMPAT_ALL \
482 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
483 XFS_SB_FEAT_INCOMPAT_SPINODES| \
484 XFS_SB_FEAT_INCOMPAT_META_UUID)
486 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
488 xfs_sb_has_incompat_feature(
492 return (sbp
->sb_features_incompat
& feature
) != 0;
495 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
496 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
498 xfs_sb_has_incompat_log_feature(
502 return (sbp
->sb_features_log_incompat
& feature
) != 0;
506 * V5 superblock specific feature checks
508 static inline bool xfs_sb_version_hascrc(struct xfs_sb
*sbp
)
510 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
;
513 static inline bool xfs_sb_version_has_pquotino(struct xfs_sb
*sbp
)
515 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
;
518 static inline int xfs_sb_version_hasftype(struct xfs_sb
*sbp
)
520 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
&&
521 xfs_sb_has_incompat_feature(sbp
, XFS_SB_FEAT_INCOMPAT_FTYPE
)) ||
522 (xfs_sb_version_hasmorebits(sbp
) &&
523 (sbp
->sb_features2
& XFS_SB_VERSION2_FTYPE
));
526 static inline bool xfs_sb_version_hasfinobt(xfs_sb_t
*sbp
)
528 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) &&
529 (sbp
->sb_features_ro_compat
& XFS_SB_FEAT_RO_COMPAT_FINOBT
);
532 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb
*sbp
)
534 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
&&
535 xfs_sb_has_incompat_feature(sbp
, XFS_SB_FEAT_INCOMPAT_SPINODES
);
539 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
540 * is stored separately from the user-visible UUID; this allows the
541 * user-visible UUID to be changed on V5 filesystems which have a
542 * filesystem UUID stamped into every piece of metadata.
544 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb
*sbp
)
546 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) &&
547 (sbp
->sb_features_incompat
& XFS_SB_FEAT_INCOMPAT_META_UUID
);
550 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb
*sbp
)
552 return (XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) &&
553 (sbp
->sb_features_ro_compat
& XFS_SB_FEAT_RO_COMPAT_RMAPBT
);
556 static inline bool xfs_sb_version_hasreflink(struct xfs_sb
*sbp
)
558 return XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
&&
559 (sbp
->sb_features_ro_compat
& XFS_SB_FEAT_RO_COMPAT_REFLINK
);
563 * end of superblock version macros
567 xfs_is_quota_inode(struct xfs_sb
*sbp
, xfs_ino_t ino
)
569 return (ino
== sbp
->sb_uquotino
||
570 ino
== sbp
->sb_gquotino
||
571 ino
== sbp
->sb_pquotino
);
574 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
575 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
576 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
578 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
579 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
580 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
581 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
582 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
585 * File system sector to basic block conversions.
587 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
590 * File system block to basic block conversions.
592 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
593 #define XFS_BB_TO_FSB(mp,bb) \
594 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
595 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
598 * File system block to byte conversions.
600 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
601 #define XFS_B_TO_FSB(mp,b) \
602 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
603 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
604 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
607 * Allocation group header
609 * This is divided into three structures, placed in sequential 512-byte
610 * buffers after a copy of the superblock (also in a 512-byte buffer).
612 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
613 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
614 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
615 #define XFS_AGF_VERSION 1
616 #define XFS_AGI_VERSION 1
618 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
619 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
622 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
625 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
628 * The second word of agf_levels in the first a.g. overlaps the EFS
629 * superblock's magic number. Since the magic numbers valid for EFS
630 * are > 64k, our value cannot be confused for an EFS superblock's.
633 typedef struct xfs_agf
{
635 * Common allocation group header information
637 __be32 agf_magicnum
; /* magic number == XFS_AGF_MAGIC */
638 __be32 agf_versionnum
; /* header version == XFS_AGF_VERSION */
639 __be32 agf_seqno
; /* sequence # starting from 0 */
640 __be32 agf_length
; /* size in blocks of a.g. */
642 * Freespace and rmap information
644 __be32 agf_roots
[XFS_BTNUM_AGF
]; /* root blocks */
645 __be32 agf_levels
[XFS_BTNUM_AGF
]; /* btree levels */
647 __be32 agf_flfirst
; /* first freelist block's index */
648 __be32 agf_fllast
; /* last freelist block's index */
649 __be32 agf_flcount
; /* count of blocks in freelist */
650 __be32 agf_freeblks
; /* total free blocks */
652 __be32 agf_longest
; /* longest free space */
653 __be32 agf_btreeblks
; /* # of blocks held in AGF btrees */
654 uuid_t agf_uuid
; /* uuid of filesystem */
656 __be32 agf_rmap_blocks
; /* rmapbt blocks used */
657 __be32 agf_refcount_blocks
; /* refcountbt blocks used */
659 __be32 agf_refcount_root
; /* refcount tree root block */
660 __be32 agf_refcount_level
; /* refcount btree levels */
663 * reserve some contiguous space for future logged fields before we add
664 * the unlogged fields. This makes the range logging via flags and
665 * structure offsets much simpler.
667 __be64 agf_spare64
[14];
669 /* unlogged fields, written during buffer writeback. */
670 __be64 agf_lsn
; /* last write sequence */
671 __be32 agf_crc
; /* crc of agf sector */
674 /* structure must be padded to 64 bit alignment */
677 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
679 #define XFS_AGF_MAGICNUM 0x00000001
680 #define XFS_AGF_VERSIONNUM 0x00000002
681 #define XFS_AGF_SEQNO 0x00000004
682 #define XFS_AGF_LENGTH 0x00000008
683 #define XFS_AGF_ROOTS 0x00000010
684 #define XFS_AGF_LEVELS 0x00000020
685 #define XFS_AGF_FLFIRST 0x00000040
686 #define XFS_AGF_FLLAST 0x00000080
687 #define XFS_AGF_FLCOUNT 0x00000100
688 #define XFS_AGF_FREEBLKS 0x00000200
689 #define XFS_AGF_LONGEST 0x00000400
690 #define XFS_AGF_BTREEBLKS 0x00000800
691 #define XFS_AGF_UUID 0x00001000
692 #define XFS_AGF_RMAP_BLOCKS 0x00002000
693 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
694 #define XFS_AGF_REFCOUNT_ROOT 0x00008000
695 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000
696 #define XFS_AGF_SPARE64 0x00020000
697 #define XFS_AGF_NUM_BITS 18
698 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
700 #define XFS_AGF_FLAGS \
701 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
702 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
703 { XFS_AGF_SEQNO, "SEQNO" }, \
704 { XFS_AGF_LENGTH, "LENGTH" }, \
705 { XFS_AGF_ROOTS, "ROOTS" }, \
706 { XFS_AGF_LEVELS, "LEVELS" }, \
707 { XFS_AGF_FLFIRST, "FLFIRST" }, \
708 { XFS_AGF_FLLAST, "FLLAST" }, \
709 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
710 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
711 { XFS_AGF_LONGEST, "LONGEST" }, \
712 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
713 { XFS_AGF_UUID, "UUID" }, \
714 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
715 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
716 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
717 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
718 { XFS_AGF_SPARE64, "SPARE64" }
720 /* disk block (xfs_daddr_t) in the AG */
721 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
722 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
723 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
726 * Size of the unlinked inode hash table in the agi.
728 #define XFS_AGI_UNLINKED_BUCKETS 64
730 typedef struct xfs_agi
{
732 * Common allocation group header information
734 __be32 agi_magicnum
; /* magic number == XFS_AGI_MAGIC */
735 __be32 agi_versionnum
; /* header version == XFS_AGI_VERSION */
736 __be32 agi_seqno
; /* sequence # starting from 0 */
737 __be32 agi_length
; /* size in blocks of a.g. */
740 * Inodes are mapped by interpreting the inode number, so no
741 * mapping data is needed here.
743 __be32 agi_count
; /* count of allocated inodes */
744 __be32 agi_root
; /* root of inode btree */
745 __be32 agi_level
; /* levels in inode btree */
746 __be32 agi_freecount
; /* number of free inodes */
748 __be32 agi_newino
; /* new inode just allocated */
749 __be32 agi_dirino
; /* last directory inode chunk */
751 * Hash table of inodes which have been unlinked but are
752 * still being referenced.
754 __be32 agi_unlinked
[XFS_AGI_UNLINKED_BUCKETS
];
756 * This marks the end of logging region 1 and start of logging region 2.
758 uuid_t agi_uuid
; /* uuid of filesystem */
759 __be32 agi_crc
; /* crc of agi sector */
761 __be64 agi_lsn
; /* last write sequence */
763 __be32 agi_free_root
; /* root of the free inode btree */
764 __be32 agi_free_level
;/* levels in free inode btree */
766 /* structure must be padded to 64 bit alignment */
769 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
771 #define XFS_AGI_MAGICNUM (1 << 0)
772 #define XFS_AGI_VERSIONNUM (1 << 1)
773 #define XFS_AGI_SEQNO (1 << 2)
774 #define XFS_AGI_LENGTH (1 << 3)
775 #define XFS_AGI_COUNT (1 << 4)
776 #define XFS_AGI_ROOT (1 << 5)
777 #define XFS_AGI_LEVEL (1 << 6)
778 #define XFS_AGI_FREECOUNT (1 << 7)
779 #define XFS_AGI_NEWINO (1 << 8)
780 #define XFS_AGI_DIRINO (1 << 9)
781 #define XFS_AGI_UNLINKED (1 << 10)
782 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
783 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
784 #define XFS_AGI_FREE_ROOT (1 << 11)
785 #define XFS_AGI_FREE_LEVEL (1 << 12)
786 #define XFS_AGI_NUM_BITS_R2 13
788 /* disk block (xfs_daddr_t) in the AG */
789 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
790 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
791 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
794 * The third a.g. block contains the a.g. freelist, an array
795 * of block pointers to blocks owned by the allocation btree code.
797 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
798 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
799 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
801 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
802 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
803 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
804 (__be32 *)(bp)->b_addr)
806 typedef struct xfs_agfl
{
807 __be32 agfl_magicnum
;
812 __be32 agfl_bno
[]; /* actually xfs_agfl_size(mp) */
813 } __attribute__((packed
)) xfs_agfl_t
;
815 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
817 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
818 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
819 #define XFS_FSB_TO_AGNO(mp,fsbno) \
820 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
821 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
822 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
823 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
824 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
825 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
826 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
829 * For checking for bad ranges of xfs_daddr_t's, covering multiple
830 * allocation groups or a single xfs_daddr_t that's a superblock copy.
832 #define XFS_AG_CHECK_DADDR(mp,d,len) \
834 ASSERT((d) == XFS_SB_DADDR || \
835 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
836 ASSERT(xfs_daddr_to_agno(mp, d) == \
837 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
839 typedef struct xfs_timestamp
{
840 __be32 t_sec
; /* timestamp seconds */
841 __be32 t_nsec
; /* timestamp nanoseconds */
845 * On-disk inode structure.
847 * This is just the header or "dinode core", the inode is expanded to fill a
848 * variable size the leftover area split into a data and an attribute fork.
849 * The format of the data and attribute fork depends on the format of the
850 * inode as indicated by di_format and di_aformat. To access the data and
851 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
854 * There is a very similar struct icdinode in xfs_inode which matches the
855 * layout of the first 96 bytes of this structure, but is kept in native
856 * format instead of big endian.
858 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
859 * padding field for v3 inodes.
861 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
862 typedef struct xfs_dinode
{
863 __be16 di_magic
; /* inode magic # = XFS_DINODE_MAGIC */
864 __be16 di_mode
; /* mode and type of file */
865 __u8 di_version
; /* inode version */
866 __u8 di_format
; /* format of di_c data */
867 __be16 di_onlink
; /* old number of links to file */
868 __be32 di_uid
; /* owner's user id */
869 __be32 di_gid
; /* owner's group id */
870 __be32 di_nlink
; /* number of links to file */
871 __be16 di_projid_lo
; /* lower part of owner's project id */
872 __be16 di_projid_hi
; /* higher part owner's project id */
873 __u8 di_pad
[6]; /* unused, zeroed space */
874 __be16 di_flushiter
; /* incremented on flush */
875 xfs_timestamp_t di_atime
; /* time last accessed */
876 xfs_timestamp_t di_mtime
; /* time last modified */
877 xfs_timestamp_t di_ctime
; /* time created/inode modified */
878 __be64 di_size
; /* number of bytes in file */
879 __be64 di_nblocks
; /* # of direct & btree blocks used */
880 __be32 di_extsize
; /* basic/minimum extent size for file */
881 __be32 di_nextents
; /* number of extents in data fork */
882 __be16 di_anextents
; /* number of extents in attribute fork*/
883 __u8 di_forkoff
; /* attr fork offs, <<3 for 64b align */
884 __s8 di_aformat
; /* format of attr fork's data */
885 __be32 di_dmevmask
; /* DMIG event mask */
886 __be16 di_dmstate
; /* DMIG state info */
887 __be16 di_flags
; /* random flags, XFS_DIFLAG_... */
888 __be32 di_gen
; /* generation number */
890 /* di_next_unlinked is the only non-core field in the old dinode */
891 __be32 di_next_unlinked
;/* agi unlinked list ptr */
893 /* start of the extended dinode, writable fields */
894 __le32 di_crc
; /* CRC of the inode */
895 __be64 di_changecount
; /* number of attribute changes */
896 __be64 di_lsn
; /* flush sequence */
897 __be64 di_flags2
; /* more random flags */
898 __be32 di_cowextsize
; /* basic cow extent size for file */
899 __u8 di_pad2
[12]; /* more padding for future expansion */
901 /* fields only written to during inode creation */
902 xfs_timestamp_t di_crtime
; /* time created */
903 __be64 di_ino
; /* inode number */
904 uuid_t di_uuid
; /* UUID of the filesystem */
906 /* structure must be padded to 64 bit alignment */
909 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
911 #define DI_MAX_FLUSH 0xffff
914 * Size of the core inode on disk. Version 1 and 2 inodes have
915 * the same size, but version 3 has grown a few additional fields.
917 static inline uint
xfs_dinode_size(int version
)
920 return sizeof(struct xfs_dinode
);
921 return offsetof(struct xfs_dinode
, di_crc
);
925 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
926 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
928 #define XFS_MAXLINK ((1U << 31) - 1U)
931 * Values for di_format
933 typedef enum xfs_dinode_fmt
{
934 XFS_DINODE_FMT_DEV
, /* xfs_dev_t */
935 XFS_DINODE_FMT_LOCAL
, /* bulk data */
936 XFS_DINODE_FMT_EXTENTS
, /* struct xfs_bmbt_rec */
937 XFS_DINODE_FMT_BTREE
, /* struct xfs_bmdr_block */
938 XFS_DINODE_FMT_UUID
/* added long ago, but never used */
942 * Inode minimum and maximum sizes.
944 #define XFS_DINODE_MIN_LOG 8
945 #define XFS_DINODE_MAX_LOG 11
946 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
947 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
950 * Inode size for given fs.
952 #define XFS_LITINO(mp, version) \
953 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
956 * Inode data & attribute fork sizes, per inode.
958 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
959 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
961 #define XFS_DFORK_DSIZE(dip,mp) \
962 (XFS_DFORK_Q(dip) ? \
963 XFS_DFORK_BOFF(dip) : \
964 XFS_LITINO(mp, (dip)->di_version))
965 #define XFS_DFORK_ASIZE(dip,mp) \
966 (XFS_DFORK_Q(dip) ? \
967 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
969 #define XFS_DFORK_SIZE(dip,mp,w) \
970 ((w) == XFS_DATA_FORK ? \
971 XFS_DFORK_DSIZE(dip, mp) : \
972 XFS_DFORK_ASIZE(dip, mp))
975 * Return pointers to the data or attribute forks.
977 #define XFS_DFORK_DPTR(dip) \
978 ((char *)dip + xfs_dinode_size(dip->di_version))
979 #define XFS_DFORK_APTR(dip) \
980 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
981 #define XFS_DFORK_PTR(dip,w) \
982 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
984 #define XFS_DFORK_FORMAT(dip,w) \
985 ((w) == XFS_DATA_FORK ? \
988 #define XFS_DFORK_NEXTENTS(dip,w) \
989 ((w) == XFS_DATA_FORK ? \
990 be32_to_cpu((dip)->di_nextents) : \
991 be16_to_cpu((dip)->di_anextents))
994 * For block and character special files the 32bit dev_t is stored at the
995 * beginning of the data fork.
997 static inline xfs_dev_t
xfs_dinode_get_rdev(struct xfs_dinode
*dip
)
999 return be32_to_cpu(*(__be32
*)XFS_DFORK_DPTR(dip
));
1002 static inline void xfs_dinode_put_rdev(struct xfs_dinode
*dip
, xfs_dev_t rdev
)
1004 *(__be32
*)XFS_DFORK_DPTR(dip
) = cpu_to_be32(rdev
);
1008 * Values for di_flags
1010 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1011 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1012 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1013 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1014 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1015 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1016 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1017 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1018 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1019 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1020 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1021 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1022 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1023 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1024 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1025 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1026 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1027 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1028 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1029 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1030 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1031 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1032 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1033 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1034 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1035 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1036 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1037 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1038 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1039 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1041 #define XFS_DIFLAG_ANY \
1042 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1043 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1044 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1045 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1046 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1049 * Values for di_flags2 These start by being exposed to userspace in the upper
1050 * 16 bits of the XFS_XFLAG_s range.
1052 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1053 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1054 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1055 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1056 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1057 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1059 #define XFS_DIFLAG2_ANY \
1060 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
1063 * Inode number format:
1064 * low inopblog bits - offset in block
1065 * next agblklog bits - block number in ag
1066 * next agno_log bits - ag number
1067 * high agno_log-agblklog-inopblog bits - 0
1069 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1070 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1071 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1072 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
1073 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1074 #define XFS_INO_BITS(mp) \
1075 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1076 #define XFS_INO_TO_AGNO(mp,i) \
1077 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1078 #define XFS_INO_TO_AGINO(mp,i) \
1079 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1080 #define XFS_INO_TO_AGBNO(mp,i) \
1081 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1082 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1083 #define XFS_INO_TO_OFFSET(mp,i) \
1084 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1085 #define XFS_INO_TO_FSB(mp,i) \
1086 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1087 #define XFS_AGINO_TO_INO(mp,a,i) \
1088 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1089 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1090 #define XFS_AGINO_TO_OFFSET(mp,i) \
1091 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1092 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1093 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1095 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1096 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1099 * RealTime Device format definitions
1102 /* Min and max rt extent sizes, specified in bytes */
1103 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1104 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1105 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1107 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1108 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1109 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
1110 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
1113 * RT Summary and bit manipulation macros.
1115 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1116 #define XFS_SUMOFFSTOBLOCK(mp,s) \
1117 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1118 #define XFS_SUMPTR(mp,bp,so) \
1119 ((xfs_suminfo_t *)((bp)->b_addr + \
1120 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1122 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
1123 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
1124 #define XFS_BITTOWORD(mp,bi) \
1125 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1127 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1128 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1130 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
1131 #define XFS_RTHIBIT(w) xfs_highbit32(w)
1133 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
1136 * Dquot and dquot block format definitions
1138 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1139 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1142 * This is the main portion of the on-disk representation of quota
1143 * information for a user. This is the q_core of the xfs_dquot_t that
1144 * is kept in kernel memory. We pad this with some more expansion room
1145 * to construct the on disk structure.
1147 typedef struct xfs_disk_dquot
{
1148 __be16 d_magic
; /* dquot magic = XFS_DQUOT_MAGIC */
1149 __u8 d_version
; /* dquot version */
1150 __u8 d_flags
; /* XFS_DQ_USER/PROJ/GROUP */
1151 __be32 d_id
; /* user,project,group id */
1152 __be64 d_blk_hardlimit
;/* absolute limit on disk blks */
1153 __be64 d_blk_softlimit
;/* preferred limit on disk blks */
1154 __be64 d_ino_hardlimit
;/* maximum # allocated inodes */
1155 __be64 d_ino_softlimit
;/* preferred inode limit */
1156 __be64 d_bcount
; /* disk blocks owned by the user */
1157 __be64 d_icount
; /* inodes owned by the user */
1158 __be32 d_itimer
; /* zero if within inode limits if not,
1159 this is when we refuse service */
1160 __be32 d_btimer
; /* similar to above; for disk blocks */
1161 __be16 d_iwarns
; /* warnings issued wrt num inodes */
1162 __be16 d_bwarns
; /* warnings issued wrt disk blocks */
1163 __be32 d_pad0
; /* 64 bit align */
1164 __be64 d_rtb_hardlimit
;/* absolute limit on realtime blks */
1165 __be64 d_rtb_softlimit
;/* preferred limit on RT disk blks */
1166 __be64 d_rtbcount
; /* realtime blocks owned */
1167 __be32 d_rtbtimer
; /* similar to above; for RT disk blocks */
1168 __be16 d_rtbwarns
; /* warnings issued wrt RT disk blocks */
1173 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1174 * carrying the unnecessary padding would be a waste of memory.
1176 typedef struct xfs_dqblk
{
1177 xfs_disk_dquot_t dd_diskdq
; /* portion that lives incore as well */
1178 char dd_fill
[4]; /* filling for posterity */
1181 * These two are only present on filesystems with the CRC bits set.
1183 __be32 dd_crc
; /* checksum */
1184 __be64 dd_lsn
; /* last modification in log */
1185 uuid_t dd_uuid
; /* location information */
1188 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1191 * Remote symlink format and access functions.
1193 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1195 struct xfs_dsymlink_hdr
{
1206 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1208 #define XFS_SYMLINK_MAXLEN 1024
1210 * The maximum pathlen is 1024 bytes. Since the minimum file system
1211 * blocksize is 512 bytes, we can get a max of 3 extents back from
1212 * bmapi when crc headers are taken into account.
1214 #define XFS_SYMLINK_MAPS 3
1216 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1217 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1218 sizeof(struct xfs_dsymlink_hdr) : 0))
1222 * Allocation Btree format definitions
1224 * There are two on-disk btrees, one sorted by blockno and one sorted
1225 * by blockcount and blockno. All blocks look the same to make the code
1226 * simpler; if we have time later, we'll make the optimizations.
1228 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1229 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1230 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1231 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1234 * Data record/key structure
1236 typedef struct xfs_alloc_rec
{
1237 __be32 ar_startblock
; /* starting block number */
1238 __be32 ar_blockcount
; /* count of free blocks */
1239 } xfs_alloc_rec_t
, xfs_alloc_key_t
;
1241 typedef struct xfs_alloc_rec_incore
{
1242 xfs_agblock_t ar_startblock
; /* starting block number */
1243 xfs_extlen_t ar_blockcount
; /* count of free blocks */
1244 } xfs_alloc_rec_incore_t
;
1246 /* btree pointer type */
1247 typedef __be32 xfs_alloc_ptr_t
;
1250 * Block numbers in the AG:
1251 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1253 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1254 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1258 * Inode Allocation Btree format definitions
1260 * There is a btree for the inode map per allocation group.
1262 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1263 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1264 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1265 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1267 typedef uint64_t xfs_inofree_t
;
1268 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1269 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1270 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1271 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1273 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1274 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1275 #define XFS_INODES_PER_HOLEMASK_BIT \
1276 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1278 static inline xfs_inofree_t
xfs_inobt_maskn(int i
, int n
)
1280 return ((n
>= XFS_INODES_PER_CHUNK
? 0 : XFS_INOBT_MASK(n
)) - 1) << i
;
1284 * The on-disk inode record structure has two formats. The original "full"
1285 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1286 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1289 * The holemask of the sparse record format allows an inode chunk to have holes
1290 * that refer to blocks not owned by the inode record. This facilitates inode
1291 * allocation in the event of severe free space fragmentation.
1293 typedef struct xfs_inobt_rec
{
1294 __be32 ir_startino
; /* starting inode number */
1297 __be32 ir_freecount
; /* count of free inodes */
1300 __be16 ir_holemask
;/* hole mask for sparse chunks */
1301 __u8 ir_count
; /* total inode count */
1302 __u8 ir_freecount
; /* count of free inodes */
1305 __be64 ir_free
; /* free inode mask */
1308 typedef struct xfs_inobt_rec_incore
{
1309 xfs_agino_t ir_startino
; /* starting inode number */
1310 uint16_t ir_holemask
; /* hole mask for sparse chunks */
1311 uint8_t ir_count
; /* total inode count */
1312 uint8_t ir_freecount
; /* count of free inodes (set bits) */
1313 xfs_inofree_t ir_free
; /* free inode mask */
1314 } xfs_inobt_rec_incore_t
;
1316 static inline bool xfs_inobt_issparse(uint16_t holemask
)
1318 /* non-zero holemask represents a sparse rec. */
1325 typedef struct xfs_inobt_key
{
1326 __be32 ir_startino
; /* starting inode number */
1329 /* btree pointer type */
1330 typedef __be32 xfs_inobt_ptr_t
;
1333 * block numbers in the AG.
1335 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1336 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1339 * Reverse mapping btree format definitions
1341 * There is a btree for the reverse map per allocation group
1343 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1346 * Ownership info for an extent. This is used to create reverse-mapping
1349 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1350 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1351 struct xfs_owner_info
{
1353 xfs_fileoff_t oi_offset
;
1354 unsigned int oi_flags
;
1358 * Special owner types.
1360 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1361 * to tell us we have a special owner value. We use these for static metadata
1362 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1364 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1365 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1366 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1367 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1368 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1369 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1370 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1371 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1372 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1373 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1375 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1378 * Data record structure
1380 struct xfs_rmap_rec
{
1381 __be32 rm_startblock
; /* extent start block */
1382 __be32 rm_blockcount
; /* extent length */
1383 __be64 rm_owner
; /* extent owner */
1384 __be64 rm_offset
; /* offset within the owner */
1389 * rm_offset:63 is the attribute fork flag
1390 * rm_offset:62 is the bmbt block flag
1391 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1392 * rm_offset:54-60 aren't used and should be zero
1393 * rm_offset:0-53 is the block offset within the inode
1395 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1396 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1397 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1399 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1400 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1401 XFS_RMAP_OFF_BMBT_BLOCK | \
1402 XFS_RMAP_OFF_UNWRITTEN)
1403 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1405 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1407 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1408 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1409 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1411 #define RMAPBT_STARTBLOCK_BITLEN 32
1412 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1413 #define RMAPBT_OWNER_BITLEN 64
1414 #define RMAPBT_ATTRFLAG_BITLEN 1
1415 #define RMAPBT_BMBTFLAG_BITLEN 1
1416 #define RMAPBT_EXNTFLAG_BITLEN 1
1417 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1418 #define RMAPBT_OFFSET_BITLEN 54
1420 #define XFS_RMAP_ATTR_FORK (1 << 0)
1421 #define XFS_RMAP_BMBT_BLOCK (1 << 1)
1422 #define XFS_RMAP_UNWRITTEN (1 << 2)
1423 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \
1424 XFS_RMAP_BMBT_BLOCK)
1425 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN)
1426 struct xfs_rmap_irec
{
1427 xfs_agblock_t rm_startblock
; /* extent start block */
1428 xfs_extlen_t rm_blockcount
; /* extent length */
1429 uint64_t rm_owner
; /* extent owner */
1430 uint64_t rm_offset
; /* offset within the owner */
1431 unsigned int rm_flags
; /* state flags */
1437 * We don't use the length for lookups
1439 struct xfs_rmap_key
{
1440 __be32 rm_startblock
; /* extent start block */
1441 __be64 rm_owner
; /* extent owner */
1442 __be64 rm_offset
; /* offset within the owner */
1443 } __attribute__((packed
));
1445 /* btree pointer type */
1446 typedef __be32 xfs_rmap_ptr_t
;
1448 #define XFS_RMAP_BLOCK(mp) \
1449 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1450 XFS_FIBT_BLOCK(mp) + 1 : \
1451 XFS_IBT_BLOCK(mp) + 1)
1454 * Reference Count Btree format definitions
1457 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1459 unsigned int xfs_refc_block(struct xfs_mount
*mp
);
1462 * Data record/key structure
1464 * Each record associates a range of physical blocks (starting at
1465 * rc_startblock and ending rc_blockcount blocks later) with a reference
1466 * count (rc_refcount). Extents that are being used to stage a copy on
1467 * write (CoW) operation are recorded in the refcount btree with a
1468 * refcount of 1. All other records must have a refcount > 1 and must
1469 * track an extent mapped only by file data forks.
1471 * Extents with a single owner (attributes, metadata, non-shared file
1472 * data) are not tracked here. Free space is also not tracked here.
1473 * This is consistent with pre-reflink XFS.
1477 * Extents that are being used to stage a copy on write are stored
1478 * in the refcount btree with a refcount of 1 and the upper bit set
1479 * on the startblock. This speeds up mount time deletion of stale
1480 * staging extents because they're all at the right side of the tree.
1482 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31))
1483 #define REFCNTBT_COWFLAG_BITLEN 1
1484 #define REFCNTBT_AGBLOCK_BITLEN 31
1486 struct xfs_refcount_rec
{
1487 __be32 rc_startblock
; /* starting block number */
1488 __be32 rc_blockcount
; /* count of blocks */
1489 __be32 rc_refcount
; /* number of inodes linked here */
1492 struct xfs_refcount_key
{
1493 __be32 rc_startblock
; /* starting block number */
1496 struct xfs_refcount_irec
{
1497 xfs_agblock_t rc_startblock
; /* starting block number */
1498 xfs_extlen_t rc_blockcount
; /* count of free blocks */
1499 xfs_nlink_t rc_refcount
; /* number of inodes linked here */
1502 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1503 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1505 /* btree pointer type */
1506 typedef __be32 xfs_refcount_ptr_t
;
1510 * BMAP Btree format definitions
1512 * This includes both the root block definition that sits inside an inode fork
1513 * and the record/pointer formats for the leaf/node in the blocks.
1515 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1516 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1519 * Bmap root header, on-disk form only.
1521 typedef struct xfs_bmdr_block
{
1522 __be16 bb_level
; /* 0 is a leaf */
1523 __be16 bb_numrecs
; /* current # of data records */
1527 * Bmap btree record and extent descriptor.
1528 * l0:63 is an extent flag (value 1 indicates non-normal).
1529 * l0:9-62 are startoff.
1530 * l0:0-8 and l1:21-63 are startblock.
1531 * l1:0-20 are blockcount.
1533 #define BMBT_EXNTFLAG_BITLEN 1
1534 #define BMBT_STARTOFF_BITLEN 54
1535 #define BMBT_STARTBLOCK_BITLEN 52
1536 #define BMBT_BLOCKCOUNT_BITLEN 21
1538 typedef struct xfs_bmbt_rec
{
1542 typedef uint64_t xfs_bmbt_rec_base_t
; /* use this for casts */
1543 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t
;
1546 * Values and macros for delayed-allocation startblock fields.
1548 #define STARTBLOCKVALBITS 17
1549 #define STARTBLOCKMASKBITS (15 + 20)
1550 #define STARTBLOCKMASK \
1551 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1553 static inline int isnullstartblock(xfs_fsblock_t x
)
1555 return ((x
) & STARTBLOCKMASK
) == STARTBLOCKMASK
;
1558 static inline xfs_fsblock_t
nullstartblock(int k
)
1560 ASSERT(k
< (1 << STARTBLOCKVALBITS
));
1561 return STARTBLOCKMASK
| (k
);
1564 static inline xfs_filblks_t
startblockval(xfs_fsblock_t x
)
1566 return (xfs_filblks_t
)((x
) & ~STARTBLOCKMASK
);
1570 * Key structure for non-leaf levels of the tree.
1572 typedef struct xfs_bmbt_key
{
1573 __be64 br_startoff
; /* starting file offset */
1574 } xfs_bmbt_key_t
, xfs_bmdr_key_t
;
1576 /* btree pointer type */
1577 typedef __be64 xfs_bmbt_ptr_t
, xfs_bmdr_ptr_t
;
1581 * Generic Btree block format definitions
1583 * This is a combination of the actual format used on disk for short and long
1584 * format btrees. The first three fields are shared by both format, but the
1585 * pointers are different and should be used with care.
1587 * To get the size of the actual short or long form headers please use the size
1588 * macros below. Never use sizeof(xfs_btree_block).
1590 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1591 * with the crc feature bit, and all accesses to them must be conditional on
1594 /* short form block header */
1595 struct xfs_btree_block_shdr
{
1606 /* long form block header */
1607 struct xfs_btree_block_lhdr
{
1616 __be32 bb_pad
; /* padding for alignment */
1619 struct xfs_btree_block
{
1620 __be32 bb_magic
; /* magic number for block type */
1621 __be16 bb_level
; /* 0 is a leaf */
1622 __be16 bb_numrecs
; /* current # of data records */
1624 struct xfs_btree_block_shdr s
;
1625 struct xfs_btree_block_lhdr l
;
1629 /* size of a short form block */
1630 #define XFS_BTREE_SBLOCK_LEN \
1631 (offsetof(struct xfs_btree_block, bb_u) + \
1632 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1633 /* size of a long form block */
1634 #define XFS_BTREE_LBLOCK_LEN \
1635 (offsetof(struct xfs_btree_block, bb_u) + \
1636 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1638 /* sizes of CRC enabled btree blocks */
1639 #define XFS_BTREE_SBLOCK_CRC_LEN \
1640 (offsetof(struct xfs_btree_block, bb_u) + \
1641 sizeof(struct xfs_btree_block_shdr))
1642 #define XFS_BTREE_LBLOCK_CRC_LEN \
1643 (offsetof(struct xfs_btree_block, bb_u) + \
1644 sizeof(struct xfs_btree_block_lhdr))
1646 #define XFS_BTREE_SBLOCK_CRC_OFF \
1647 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1648 #define XFS_BTREE_LBLOCK_CRC_OFF \
1649 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1652 * On-disk XFS access control list structure.
1654 struct xfs_acl_entry
{
1658 __be16 ae_pad
; /* fill the implicit hole in the structure */
1663 struct xfs_acl_entry acl_entry
[0];
1667 * The number of ACL entries allowed is defined by the on-disk format.
1668 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1669 * limited only by the maximum size of the xattr that stores the information.
1671 #define XFS_ACL_MAX_ENTRIES(mp) \
1672 (xfs_sb_version_hascrc(&mp->m_sb) \
1673 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1674 sizeof(struct xfs_acl_entry) \
1677 #define XFS_ACL_SIZE(cnt) \
1678 (sizeof(struct xfs_acl) + \
1679 sizeof(struct xfs_acl_entry) * cnt)
1681 #define XFS_ACL_MAX_SIZE(mp) \
1682 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1685 /* On-disk XFS extended attribute names */
1686 #define SGI_ACL_FILE "SGI_ACL_FILE"
1687 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1688 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1689 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1691 #endif /* __XFS_FORMAT_H__ */