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_rtblock_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.
187 typedef struct xfs_dsb {
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 */
270 * Misc. Flags - warning - these will be cleared by xfs_repair unless
271 * a feature bit is set when the flag is used.
273 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
274 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
277 * define max. shared version we can interoperate with
279 #define XFS_SB_MAX_SHARED_VN 0
281 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
284 * The first XFS version we support is a v4 superblock with V2 directories.
286 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
288 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
291 /* check for unknown features in the fs */
292 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
293 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
294 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
300 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
302 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
304 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
305 return xfs_sb_good_v4_features(sbp);
309 static inline bool xfs_sb_version_hasrealtime(struct xfs_sb *sbp)
311 return sbp->sb_rblocks > 0;
315 * Detect a mismatched features2 field. Older kernels read/wrote
316 * this into the wrong slot, so to be safe we keep them in sync.
318 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
320 return sbp->sb_bad_features2 != sbp->sb_features2;
323 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
325 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
328 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
330 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
333 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
335 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
338 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
340 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
343 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
345 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
346 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
349 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
351 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
354 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
356 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
357 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
360 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
362 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
363 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
366 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
368 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
371 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
373 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
376 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
378 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
379 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
383 * sb_features2 bit version macros.
385 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
387 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
388 (xfs_sb_version_hasmorebits(sbp) &&
389 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
392 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
394 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
395 (xfs_sb_version_hasmorebits(sbp) &&
396 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
399 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
401 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
402 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
405 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
407 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
408 if (!sbp->sb_features2)
409 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
412 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
414 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
415 (xfs_sb_version_hasmorebits(sbp) &&
416 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
419 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
421 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
422 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
426 * Extended v5 superblock feature masks. These are to be used for new v5
427 * superblock features only.
429 * Compat features are new features that old kernels will not notice or affect
430 * and so can mount read-write without issues.
432 * RO-Compat (read only) are features that old kernels can read but will break
433 * if they write. Hence only read-only mounts of such filesystems are allowed on
434 * kernels that don't support the feature bit.
436 * InCompat features are features which old kernels will not understand and so
439 * Log-InCompat features are for changes to log formats or new transactions that
440 * can't be replayed on older kernels. The fields are set when the filesystem is
441 * mounted, and a clean unmount clears the fields.
443 #define XFS_SB_FEAT_COMPAT_ALL 0
444 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
446 xfs_sb_has_compat_feature(
450 return (sbp->sb_features_compat & feature) != 0;
453 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
454 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
455 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
456 #define XFS_SB_FEAT_RO_COMPAT_ALL \
457 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
458 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
459 XFS_SB_FEAT_RO_COMPAT_REFLINK)
460 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
462 xfs_sb_has_ro_compat_feature(
466 return (sbp->sb_features_ro_compat & feature) != 0;
469 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
470 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
471 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
472 #define XFS_SB_FEAT_INCOMPAT_ALL \
473 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
474 XFS_SB_FEAT_INCOMPAT_SPINODES| \
475 XFS_SB_FEAT_INCOMPAT_META_UUID)
477 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
479 xfs_sb_has_incompat_feature(
483 return (sbp->sb_features_incompat & feature) != 0;
486 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
487 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
489 xfs_sb_has_incompat_log_feature(
493 return (sbp->sb_features_log_incompat & feature) != 0;
497 * V5 superblock specific feature checks
499 static inline bool xfs_sb_version_hascrc(struct xfs_sb *sbp)
501 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
504 static inline bool xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
506 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
509 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
511 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
512 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
513 (xfs_sb_version_hasmorebits(sbp) &&
514 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
517 static inline bool xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
519 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
520 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
523 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
525 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
526 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
530 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
531 * is stored separately from the user-visible UUID; this allows the
532 * user-visible UUID to be changed on V5 filesystems which have a
533 * filesystem UUID stamped into every piece of metadata.
535 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
537 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
538 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
541 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp)
543 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
544 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
547 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
549 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
550 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
554 * end of superblock version macros
558 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
560 return (ino == sbp->sb_uquotino ||
561 ino == sbp->sb_gquotino ||
562 ino == sbp->sb_pquotino);
565 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
566 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
567 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
569 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
570 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
571 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
572 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
573 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
576 * File system sector to basic block conversions.
578 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
581 * File system block to basic block conversions.
583 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
584 #define XFS_BB_TO_FSB(mp,bb) \
585 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
586 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
589 * File system block to byte conversions.
591 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
592 #define XFS_B_TO_FSB(mp,b) \
593 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
594 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
595 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
598 * Allocation group header
600 * This is divided into three structures, placed in sequential 512-byte
601 * buffers after a copy of the superblock (also in a 512-byte buffer).
603 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
604 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
605 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
606 #define XFS_AGF_VERSION 1
607 #define XFS_AGI_VERSION 1
609 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
610 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
613 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
616 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
619 * The second word of agf_levels in the first a.g. overlaps the EFS
620 * superblock's magic number. Since the magic numbers valid for EFS
621 * are > 64k, our value cannot be confused for an EFS superblock's.
624 typedef struct xfs_agf {
626 * Common allocation group header information
628 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
629 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
630 __be32 agf_seqno; /* sequence # starting from 0 */
631 __be32 agf_length; /* size in blocks of a.g. */
633 * Freespace and rmap information
635 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
636 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
638 __be32 agf_flfirst; /* first freelist block's index */
639 __be32 agf_fllast; /* last freelist block's index */
640 __be32 agf_flcount; /* count of blocks in freelist */
641 __be32 agf_freeblks; /* total free blocks */
643 __be32 agf_longest; /* longest free space */
644 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
645 uuid_t agf_uuid; /* uuid of filesystem */
647 __be32 agf_rmap_blocks; /* rmapbt blocks used */
648 __be32 agf_refcount_blocks; /* refcountbt blocks used */
650 __be32 agf_refcount_root; /* refcount tree root block */
651 __be32 agf_refcount_level; /* refcount btree levels */
654 * reserve some contiguous space for future logged fields before we add
655 * the unlogged fields. This makes the range logging via flags and
656 * structure offsets much simpler.
658 __be64 agf_spare64[14];
660 /* unlogged fields, written during buffer writeback. */
661 __be64 agf_lsn; /* last write sequence */
662 __be32 agf_crc; /* crc of agf sector */
665 /* structure must be padded to 64 bit alignment */
668 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
670 #define XFS_AGF_MAGICNUM 0x00000001
671 #define XFS_AGF_VERSIONNUM 0x00000002
672 #define XFS_AGF_SEQNO 0x00000004
673 #define XFS_AGF_LENGTH 0x00000008
674 #define XFS_AGF_ROOTS 0x00000010
675 #define XFS_AGF_LEVELS 0x00000020
676 #define XFS_AGF_FLFIRST 0x00000040
677 #define XFS_AGF_FLLAST 0x00000080
678 #define XFS_AGF_FLCOUNT 0x00000100
679 #define XFS_AGF_FREEBLKS 0x00000200
680 #define XFS_AGF_LONGEST 0x00000400
681 #define XFS_AGF_BTREEBLKS 0x00000800
682 #define XFS_AGF_UUID 0x00001000
683 #define XFS_AGF_RMAP_BLOCKS 0x00002000
684 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
685 #define XFS_AGF_REFCOUNT_ROOT 0x00008000
686 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000
687 #define XFS_AGF_SPARE64 0x00020000
688 #define XFS_AGF_NUM_BITS 18
689 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
691 #define XFS_AGF_FLAGS \
692 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
693 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
694 { XFS_AGF_SEQNO, "SEQNO" }, \
695 { XFS_AGF_LENGTH, "LENGTH" }, \
696 { XFS_AGF_ROOTS, "ROOTS" }, \
697 { XFS_AGF_LEVELS, "LEVELS" }, \
698 { XFS_AGF_FLFIRST, "FLFIRST" }, \
699 { XFS_AGF_FLLAST, "FLLAST" }, \
700 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
701 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
702 { XFS_AGF_LONGEST, "LONGEST" }, \
703 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
704 { XFS_AGF_UUID, "UUID" }, \
705 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
706 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
707 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
708 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
709 { XFS_AGF_SPARE64, "SPARE64" }
711 /* disk block (xfs_daddr_t) in the AG */
712 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
713 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
714 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
717 * Size of the unlinked inode hash table in the agi.
719 #define XFS_AGI_UNLINKED_BUCKETS 64
721 typedef struct xfs_agi {
723 * Common allocation group header information
725 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
726 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
727 __be32 agi_seqno; /* sequence # starting from 0 */
728 __be32 agi_length; /* size in blocks of a.g. */
731 * Inodes are mapped by interpreting the inode number, so no
732 * mapping data is needed here.
734 __be32 agi_count; /* count of allocated inodes */
735 __be32 agi_root; /* root of inode btree */
736 __be32 agi_level; /* levels in inode btree */
737 __be32 agi_freecount; /* number of free inodes */
739 __be32 agi_newino; /* new inode just allocated */
740 __be32 agi_dirino; /* last directory inode chunk */
742 * Hash table of inodes which have been unlinked but are
743 * still being referenced.
745 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
747 * This marks the end of logging region 1 and start of logging region 2.
749 uuid_t agi_uuid; /* uuid of filesystem */
750 __be32 agi_crc; /* crc of agi sector */
752 __be64 agi_lsn; /* last write sequence */
754 __be32 agi_free_root; /* root of the free inode btree */
755 __be32 agi_free_level;/* levels in free inode btree */
757 /* structure must be padded to 64 bit alignment */
760 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
762 #define XFS_AGI_MAGICNUM (1 << 0)
763 #define XFS_AGI_VERSIONNUM (1 << 1)
764 #define XFS_AGI_SEQNO (1 << 2)
765 #define XFS_AGI_LENGTH (1 << 3)
766 #define XFS_AGI_COUNT (1 << 4)
767 #define XFS_AGI_ROOT (1 << 5)
768 #define XFS_AGI_LEVEL (1 << 6)
769 #define XFS_AGI_FREECOUNT (1 << 7)
770 #define XFS_AGI_NEWINO (1 << 8)
771 #define XFS_AGI_DIRINO (1 << 9)
772 #define XFS_AGI_UNLINKED (1 << 10)
773 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
774 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
775 #define XFS_AGI_FREE_ROOT (1 << 11)
776 #define XFS_AGI_FREE_LEVEL (1 << 12)
777 #define XFS_AGI_NUM_BITS_R2 13
779 /* disk block (xfs_daddr_t) in the AG */
780 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
781 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
782 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
785 * The third a.g. block contains the a.g. freelist, an array
786 * of block pointers to blocks owned by the allocation btree code.
788 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
789 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
790 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
792 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
793 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
794 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
795 (__be32 *)(bp)->b_addr)
797 typedef struct xfs_agfl {
798 __be32 agfl_magicnum;
803 __be32 agfl_bno[]; /* actually xfs_agfl_size(mp) */
804 } __attribute__((packed)) xfs_agfl_t;
806 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
808 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
809 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
810 #define XFS_FSB_TO_AGNO(mp,fsbno) \
811 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
812 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
813 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
814 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
815 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
816 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
817 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
820 * For checking for bad ranges of xfs_daddr_t's, covering multiple
821 * allocation groups or a single xfs_daddr_t that's a superblock copy.
823 #define XFS_AG_CHECK_DADDR(mp,d,len) \
825 ASSERT((d) == XFS_SB_DADDR || \
826 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
827 ASSERT(xfs_daddr_to_agno(mp, d) == \
828 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
830 typedef struct xfs_timestamp {
831 __be32 t_sec; /* timestamp seconds */
832 __be32 t_nsec; /* timestamp nanoseconds */
836 * On-disk inode structure.
838 * This is just the header or "dinode core", the inode is expanded to fill a
839 * variable size the leftover area split into a data and an attribute fork.
840 * The format of the data and attribute fork depends on the format of the
841 * inode as indicated by di_format and di_aformat. To access the data and
842 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
845 * There is a very similar struct icdinode in xfs_inode which matches the
846 * layout of the first 96 bytes of this structure, but is kept in native
847 * format instead of big endian.
849 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
850 * padding field for v3 inodes.
852 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
853 typedef struct xfs_dinode {
854 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
855 __be16 di_mode; /* mode and type of file */
856 __u8 di_version; /* inode version */
857 __u8 di_format; /* format of di_c data */
858 __be16 di_onlink; /* old number of links to file */
859 __be32 di_uid; /* owner's user id */
860 __be32 di_gid; /* owner's group id */
861 __be32 di_nlink; /* number of links to file */
862 __be16 di_projid_lo; /* lower part of owner's project id */
863 __be16 di_projid_hi; /* higher part owner's project id */
864 __u8 di_pad[6]; /* unused, zeroed space */
865 __be16 di_flushiter; /* incremented on flush */
866 xfs_timestamp_t di_atime; /* time last accessed */
867 xfs_timestamp_t di_mtime; /* time last modified */
868 xfs_timestamp_t di_ctime; /* time created/inode modified */
869 __be64 di_size; /* number of bytes in file */
870 __be64 di_nblocks; /* # of direct & btree blocks used */
871 __be32 di_extsize; /* basic/minimum extent size for file */
872 __be32 di_nextents; /* number of extents in data fork */
873 __be16 di_anextents; /* number of extents in attribute fork*/
874 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
875 __s8 di_aformat; /* format of attr fork's data */
876 __be32 di_dmevmask; /* DMIG event mask */
877 __be16 di_dmstate; /* DMIG state info */
878 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
879 __be32 di_gen; /* generation number */
881 /* di_next_unlinked is the only non-core field in the old dinode */
882 __be32 di_next_unlinked;/* agi unlinked list ptr */
884 /* start of the extended dinode, writable fields */
885 __le32 di_crc; /* CRC of the inode */
886 __be64 di_changecount; /* number of attribute changes */
887 __be64 di_lsn; /* flush sequence */
888 __be64 di_flags2; /* more random flags */
889 __be32 di_cowextsize; /* basic cow extent size for file */
890 __u8 di_pad2[12]; /* more padding for future expansion */
892 /* fields only written to during inode creation */
893 xfs_timestamp_t di_crtime; /* time created */
894 __be64 di_ino; /* inode number */
895 uuid_t di_uuid; /* UUID of the filesystem */
897 /* structure must be padded to 64 bit alignment */
900 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
902 #define DI_MAX_FLUSH 0xffff
905 * Size of the core inode on disk. Version 1 and 2 inodes have
906 * the same size, but version 3 has grown a few additional fields.
908 static inline uint xfs_dinode_size(int version)
911 return sizeof(struct xfs_dinode);
912 return offsetof(struct xfs_dinode, di_crc);
916 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
917 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
919 #define XFS_MAXLINK ((1U << 31) - 1U)
922 * Values for di_format
924 typedef enum xfs_dinode_fmt {
925 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
926 XFS_DINODE_FMT_LOCAL, /* bulk data */
927 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
928 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
929 XFS_DINODE_FMT_UUID /* added long ago, but never used */
933 * Inode minimum and maximum sizes.
935 #define XFS_DINODE_MIN_LOG 8
936 #define XFS_DINODE_MAX_LOG 11
937 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
938 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
941 * Inode size for given fs.
943 #define XFS_LITINO(mp, version) \
944 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
947 * Inode data & attribute fork sizes, per inode.
949 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
950 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
952 #define XFS_DFORK_DSIZE(dip,mp) \
953 (XFS_DFORK_Q(dip) ? \
954 XFS_DFORK_BOFF(dip) : \
955 XFS_LITINO(mp, (dip)->di_version))
956 #define XFS_DFORK_ASIZE(dip,mp) \
957 (XFS_DFORK_Q(dip) ? \
958 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
960 #define XFS_DFORK_SIZE(dip,mp,w) \
961 ((w) == XFS_DATA_FORK ? \
962 XFS_DFORK_DSIZE(dip, mp) : \
963 XFS_DFORK_ASIZE(dip, mp))
966 * Return pointers to the data or attribute forks.
968 #define XFS_DFORK_DPTR(dip) \
969 ((char *)dip + xfs_dinode_size(dip->di_version))
970 #define XFS_DFORK_APTR(dip) \
971 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
972 #define XFS_DFORK_PTR(dip,w) \
973 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
975 #define XFS_DFORK_FORMAT(dip,w) \
976 ((w) == XFS_DATA_FORK ? \
979 #define XFS_DFORK_NEXTENTS(dip,w) \
980 ((w) == XFS_DATA_FORK ? \
981 be32_to_cpu((dip)->di_nextents) : \
982 be16_to_cpu((dip)->di_anextents))
985 * For block and character special files the 32bit dev_t is stored at the
986 * beginning of the data fork.
988 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
990 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
993 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
995 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
999 * Values for di_flags
1001 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1002 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1003 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1004 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1005 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1006 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1007 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1008 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1009 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1010 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1011 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1012 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1013 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1014 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1015 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1016 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1017 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1018 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1019 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1020 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1021 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1022 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1023 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1024 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1025 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1026 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1027 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1028 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1029 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1030 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1032 #define XFS_DIFLAG_ANY \
1033 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1034 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1035 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1036 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1037 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1040 * Values for di_flags2 These start by being exposed to userspace in the upper
1041 * 16 bits of the XFS_XFLAG_s range.
1043 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1044 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1045 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1046 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1047 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1048 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1050 #define XFS_DIFLAG2_ANY \
1051 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
1054 * Inode number format:
1055 * low inopblog bits - offset in block
1056 * next agblklog bits - block number in ag
1057 * next agno_log bits - ag number
1058 * high agno_log-agblklog-inopblog bits - 0
1060 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1061 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1062 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1063 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
1064 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1065 #define XFS_INO_BITS(mp) \
1066 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1067 #define XFS_INO_TO_AGNO(mp,i) \
1068 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1069 #define XFS_INO_TO_AGINO(mp,i) \
1070 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1071 #define XFS_INO_TO_AGBNO(mp,i) \
1072 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1073 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1074 #define XFS_INO_TO_OFFSET(mp,i) \
1075 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1076 #define XFS_INO_TO_FSB(mp,i) \
1077 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1078 #define XFS_AGINO_TO_INO(mp,a,i) \
1079 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1080 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1081 #define XFS_AGINO_TO_OFFSET(mp,i) \
1082 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1083 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1084 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1086 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1087 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1090 * RealTime Device format definitions
1093 /* Min and max rt extent sizes, specified in bytes */
1094 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1095 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1096 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1098 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1099 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1100 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
1101 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
1104 * RT Summary and bit manipulation macros.
1106 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1107 #define XFS_SUMOFFSTOBLOCK(mp,s) \
1108 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1109 #define XFS_SUMPTR(mp,bp,so) \
1110 ((xfs_suminfo_t *)((bp)->b_addr + \
1111 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1113 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
1114 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
1115 #define XFS_BITTOWORD(mp,bi) \
1116 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1118 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1119 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1121 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
1122 #define XFS_RTHIBIT(w) xfs_highbit32(w)
1124 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
1127 * Dquot and dquot block format definitions
1129 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1130 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1133 * This is the main portion of the on-disk representation of quota
1134 * information for a user. This is the q_core of the xfs_dquot_t that
1135 * is kept in kernel memory. We pad this with some more expansion room
1136 * to construct the on disk structure.
1138 typedef struct xfs_disk_dquot {
1139 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1140 __u8 d_version; /* dquot version */
1141 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
1142 __be32 d_id; /* user,project,group id */
1143 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1144 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1145 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1146 __be64 d_ino_softlimit;/* preferred inode limit */
1147 __be64 d_bcount; /* disk blocks owned by the user */
1148 __be64 d_icount; /* inodes owned by the user */
1149 __be32 d_itimer; /* zero if within inode limits if not,
1150 this is when we refuse service */
1151 __be32 d_btimer; /* similar to above; for disk blocks */
1152 __be16 d_iwarns; /* warnings issued wrt num inodes */
1153 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1154 __be32 d_pad0; /* 64 bit align */
1155 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1156 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1157 __be64 d_rtbcount; /* realtime blocks owned */
1158 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1159 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1164 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1165 * carrying the unnecessary padding would be a waste of memory.
1167 typedef struct xfs_dqblk {
1168 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */
1169 char dd_fill[4]; /* filling for posterity */
1172 * These two are only present on filesystems with the CRC bits set.
1174 __be32 dd_crc; /* checksum */
1175 __be64 dd_lsn; /* last modification in log */
1176 uuid_t dd_uuid; /* location information */
1179 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1182 * Remote symlink format and access functions.
1184 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1186 struct xfs_dsymlink_hdr {
1197 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1199 #define XFS_SYMLINK_MAXLEN 1024
1201 * The maximum pathlen is 1024 bytes. Since the minimum file system
1202 * blocksize is 512 bytes, we can get a max of 3 extents back from
1203 * bmapi when crc headers are taken into account.
1205 #define XFS_SYMLINK_MAPS 3
1207 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1208 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1209 sizeof(struct xfs_dsymlink_hdr) : 0))
1213 * Allocation Btree format definitions
1215 * There are two on-disk btrees, one sorted by blockno and one sorted
1216 * by blockcount and blockno. All blocks look the same to make the code
1217 * simpler; if we have time later, we'll make the optimizations.
1219 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1220 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1221 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1222 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1225 * Data record/key structure
1227 typedef struct xfs_alloc_rec {
1228 __be32 ar_startblock; /* starting block number */
1229 __be32 ar_blockcount; /* count of free blocks */
1230 } xfs_alloc_rec_t, xfs_alloc_key_t;
1232 typedef struct xfs_alloc_rec_incore {
1233 xfs_agblock_t ar_startblock; /* starting block number */
1234 xfs_extlen_t ar_blockcount; /* count of free blocks */
1235 } xfs_alloc_rec_incore_t;
1237 /* btree pointer type */
1238 typedef __be32 xfs_alloc_ptr_t;
1241 * Block numbers in the AG:
1242 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1244 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1245 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1249 * Inode Allocation Btree format definitions
1251 * There is a btree for the inode map per allocation group.
1253 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1254 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1255 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1256 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1258 typedef uint64_t xfs_inofree_t;
1259 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1260 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1261 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1262 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1264 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1265 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1266 #define XFS_INODES_PER_HOLEMASK_BIT \
1267 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1269 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1271 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1275 * The on-disk inode record structure has two formats. The original "full"
1276 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1277 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1280 * The holemask of the sparse record format allows an inode chunk to have holes
1281 * that refer to blocks not owned by the inode record. This facilitates inode
1282 * allocation in the event of severe free space fragmentation.
1284 typedef struct xfs_inobt_rec {
1285 __be32 ir_startino; /* starting inode number */
1288 __be32 ir_freecount; /* count of free inodes */
1291 __be16 ir_holemask;/* hole mask for sparse chunks */
1292 __u8 ir_count; /* total inode count */
1293 __u8 ir_freecount; /* count of free inodes */
1296 __be64 ir_free; /* free inode mask */
1299 typedef struct xfs_inobt_rec_incore {
1300 xfs_agino_t ir_startino; /* starting inode number */
1301 uint16_t ir_holemask; /* hole mask for sparse chunks */
1302 uint8_t ir_count; /* total inode count */
1303 uint8_t ir_freecount; /* count of free inodes (set bits) */
1304 xfs_inofree_t ir_free; /* free inode mask */
1305 } xfs_inobt_rec_incore_t;
1307 static inline bool xfs_inobt_issparse(uint16_t holemask)
1309 /* non-zero holemask represents a sparse rec. */
1316 typedef struct xfs_inobt_key {
1317 __be32 ir_startino; /* starting inode number */
1320 /* btree pointer type */
1321 typedef __be32 xfs_inobt_ptr_t;
1324 * block numbers in the AG.
1326 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1327 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1330 * Reverse mapping btree format definitions
1332 * There is a btree for the reverse map per allocation group
1334 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1337 * Ownership info for an extent. This is used to create reverse-mapping
1340 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1341 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1342 struct xfs_owner_info {
1344 xfs_fileoff_t oi_offset;
1345 unsigned int oi_flags;
1349 * Special owner types.
1351 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1352 * to tell us we have a special owner value. We use these for static metadata
1353 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1355 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1356 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1357 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1358 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1359 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1360 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1361 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1362 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1363 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1364 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1366 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1369 * Data record structure
1371 struct xfs_rmap_rec {
1372 __be32 rm_startblock; /* extent start block */
1373 __be32 rm_blockcount; /* extent length */
1374 __be64 rm_owner; /* extent owner */
1375 __be64 rm_offset; /* offset within the owner */
1380 * rm_offset:63 is the attribute fork flag
1381 * rm_offset:62 is the bmbt block flag
1382 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1383 * rm_offset:54-60 aren't used and should be zero
1384 * rm_offset:0-53 is the block offset within the inode
1386 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1387 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1388 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1390 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1391 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1392 XFS_RMAP_OFF_BMBT_BLOCK | \
1393 XFS_RMAP_OFF_UNWRITTEN)
1394 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1396 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1398 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1399 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1400 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1402 #define RMAPBT_STARTBLOCK_BITLEN 32
1403 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1404 #define RMAPBT_OWNER_BITLEN 64
1405 #define RMAPBT_ATTRFLAG_BITLEN 1
1406 #define RMAPBT_BMBTFLAG_BITLEN 1
1407 #define RMAPBT_EXNTFLAG_BITLEN 1
1408 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1409 #define RMAPBT_OFFSET_BITLEN 54
1411 #define XFS_RMAP_ATTR_FORK (1 << 0)
1412 #define XFS_RMAP_BMBT_BLOCK (1 << 1)
1413 #define XFS_RMAP_UNWRITTEN (1 << 2)
1414 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \
1415 XFS_RMAP_BMBT_BLOCK)
1416 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN)
1417 struct xfs_rmap_irec {
1418 xfs_agblock_t rm_startblock; /* extent start block */
1419 xfs_extlen_t rm_blockcount; /* extent length */
1420 uint64_t rm_owner; /* extent owner */
1421 uint64_t rm_offset; /* offset within the owner */
1422 unsigned int rm_flags; /* state flags */
1428 * We don't use the length for lookups
1430 struct xfs_rmap_key {
1431 __be32 rm_startblock; /* extent start block */
1432 __be64 rm_owner; /* extent owner */
1433 __be64 rm_offset; /* offset within the owner */
1434 } __attribute__((packed));
1436 /* btree pointer type */
1437 typedef __be32 xfs_rmap_ptr_t;
1439 #define XFS_RMAP_BLOCK(mp) \
1440 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1441 XFS_FIBT_BLOCK(mp) + 1 : \
1442 XFS_IBT_BLOCK(mp) + 1)
1445 * Reference Count Btree format definitions
1448 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1450 unsigned int xfs_refc_block(struct xfs_mount *mp);
1453 * Data record/key structure
1455 * Each record associates a range of physical blocks (starting at
1456 * rc_startblock and ending rc_blockcount blocks later) with a reference
1457 * count (rc_refcount). Extents that are being used to stage a copy on
1458 * write (CoW) operation are recorded in the refcount btree with a
1459 * refcount of 1. All other records must have a refcount > 1 and must
1460 * track an extent mapped only by file data forks.
1462 * Extents with a single owner (attributes, metadata, non-shared file
1463 * data) are not tracked here. Free space is also not tracked here.
1464 * This is consistent with pre-reflink XFS.
1468 * Extents that are being used to stage a copy on write are stored
1469 * in the refcount btree with a refcount of 1 and the upper bit set
1470 * on the startblock. This speeds up mount time deletion of stale
1471 * staging extents because they're all at the right side of the tree.
1473 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31))
1474 #define REFCNTBT_COWFLAG_BITLEN 1
1475 #define REFCNTBT_AGBLOCK_BITLEN 31
1477 struct xfs_refcount_rec {
1478 __be32 rc_startblock; /* starting block number */
1479 __be32 rc_blockcount; /* count of blocks */
1480 __be32 rc_refcount; /* number of inodes linked here */
1483 struct xfs_refcount_key {
1484 __be32 rc_startblock; /* starting block number */
1487 struct xfs_refcount_irec {
1488 xfs_agblock_t rc_startblock; /* starting block number */
1489 xfs_extlen_t rc_blockcount; /* count of free blocks */
1490 xfs_nlink_t rc_refcount; /* number of inodes linked here */
1493 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1494 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1496 /* btree pointer type */
1497 typedef __be32 xfs_refcount_ptr_t;
1501 * BMAP Btree format definitions
1503 * This includes both the root block definition that sits inside an inode fork
1504 * and the record/pointer formats for the leaf/node in the blocks.
1506 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1507 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1510 * Bmap root header, on-disk form only.
1512 typedef struct xfs_bmdr_block {
1513 __be16 bb_level; /* 0 is a leaf */
1514 __be16 bb_numrecs; /* current # of data records */
1518 * Bmap btree record and extent descriptor.
1519 * l0:63 is an extent flag (value 1 indicates non-normal).
1520 * l0:9-62 are startoff.
1521 * l0:0-8 and l1:21-63 are startblock.
1522 * l1:0-20 are blockcount.
1524 #define BMBT_EXNTFLAG_BITLEN 1
1525 #define BMBT_STARTOFF_BITLEN 54
1526 #define BMBT_STARTBLOCK_BITLEN 52
1527 #define BMBT_BLOCKCOUNT_BITLEN 21
1529 typedef struct xfs_bmbt_rec {
1533 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1534 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1537 * Values and macros for delayed-allocation startblock fields.
1539 #define STARTBLOCKVALBITS 17
1540 #define STARTBLOCKMASKBITS (15 + 20)
1541 #define STARTBLOCKMASK \
1542 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1544 static inline int isnullstartblock(xfs_fsblock_t x)
1546 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1549 static inline xfs_fsblock_t nullstartblock(int k)
1551 ASSERT(k < (1 << STARTBLOCKVALBITS));
1552 return STARTBLOCKMASK | (k);
1555 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1557 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1561 * Key structure for non-leaf levels of the tree.
1563 typedef struct xfs_bmbt_key {
1564 __be64 br_startoff; /* starting file offset */
1565 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1567 /* btree pointer type */
1568 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1572 * Generic Btree block format definitions
1574 * This is a combination of the actual format used on disk for short and long
1575 * format btrees. The first three fields are shared by both format, but the
1576 * pointers are different and should be used with care.
1578 * To get the size of the actual short or long form headers please use the size
1579 * macros below. Never use sizeof(xfs_btree_block).
1581 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1582 * with the crc feature bit, and all accesses to them must be conditional on
1585 /* short form block header */
1586 struct xfs_btree_block_shdr {
1597 /* long form block header */
1598 struct xfs_btree_block_lhdr {
1607 __be32 bb_pad; /* padding for alignment */
1610 struct xfs_btree_block {
1611 __be32 bb_magic; /* magic number for block type */
1612 __be16 bb_level; /* 0 is a leaf */
1613 __be16 bb_numrecs; /* current # of data records */
1615 struct xfs_btree_block_shdr s;
1616 struct xfs_btree_block_lhdr l;
1620 /* size of a short form block */
1621 #define XFS_BTREE_SBLOCK_LEN \
1622 (offsetof(struct xfs_btree_block, bb_u) + \
1623 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1624 /* size of a long form block */
1625 #define XFS_BTREE_LBLOCK_LEN \
1626 (offsetof(struct xfs_btree_block, bb_u) + \
1627 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1629 /* sizes of CRC enabled btree blocks */
1630 #define XFS_BTREE_SBLOCK_CRC_LEN \
1631 (offsetof(struct xfs_btree_block, bb_u) + \
1632 sizeof(struct xfs_btree_block_shdr))
1633 #define XFS_BTREE_LBLOCK_CRC_LEN \
1634 (offsetof(struct xfs_btree_block, bb_u) + \
1635 sizeof(struct xfs_btree_block_lhdr))
1637 #define XFS_BTREE_SBLOCK_CRC_OFF \
1638 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1639 #define XFS_BTREE_LBLOCK_CRC_OFF \
1640 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1643 * On-disk XFS access control list structure.
1645 struct xfs_acl_entry {
1649 __be16 ae_pad; /* fill the implicit hole in the structure */
1654 struct xfs_acl_entry acl_entry[0];
1658 * The number of ACL entries allowed is defined by the on-disk format.
1659 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1660 * limited only by the maximum size of the xattr that stores the information.
1662 #define XFS_ACL_MAX_ENTRIES(mp) \
1663 (xfs_sb_version_hascrc(&mp->m_sb) \
1664 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1665 sizeof(struct xfs_acl_entry) \
1668 #define XFS_ACL_SIZE(cnt) \
1669 (sizeof(struct xfs_acl) + \
1670 sizeof(struct xfs_acl_entry) * cnt)
1672 #define XFS_ACL_MAX_SIZE(mp) \
1673 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1676 /* On-disk XFS extended attribute names */
1677 #define SGI_ACL_FILE "SGI_ACL_FILE"
1678 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1679 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1680 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1682 #endif /* __XFS_FORMAT_H__ */