1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
6 #ifndef __XFS_FORMAT_H__
7 #define __XFS_FORMAT_H__
10 * XFS On Disk Format Definitions
12 * This header file defines all the on-disk format definitions for
13 * general XFS objects. Directory and attribute related objects are defined in
14 * xfs_da_format.h, which log and log item formats are defined in
15 * xfs_log_format.h. Everything else goes here.
26 * Fits into a sector-sized buffer at address 0 of each allocation group.
27 * Only the first of these is ever updated except during growfs.
29 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
30 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
31 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
32 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
33 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
34 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
35 #define XFS_SB_VERSION_NUMBITS 0x000f
36 #define XFS_SB_VERSION_ALLFBITS 0xfff0
37 #define XFS_SB_VERSION_ATTRBIT 0x0010
38 #define XFS_SB_VERSION_NLINKBIT 0x0020
39 #define XFS_SB_VERSION_QUOTABIT 0x0040
40 #define XFS_SB_VERSION_ALIGNBIT 0x0080
41 #define XFS_SB_VERSION_DALIGNBIT 0x0100
42 #define XFS_SB_VERSION_SHAREDBIT 0x0200
43 #define XFS_SB_VERSION_LOGV2BIT 0x0400
44 #define XFS_SB_VERSION_SECTORBIT 0x0800
45 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
46 #define XFS_SB_VERSION_DIRV2BIT 0x2000
47 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
48 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
51 * The size of a single extended attribute on disk is limited by
52 * the size of index values within the attribute entries themselves.
53 * These are be16 fields, so we can only support attribute data
54 * sizes up to 2^16 bytes in length.
56 #define XFS_XATTR_SIZE_MAX (1 << 16)
59 * Supported feature bit list is just all bits in the versionnum field because
60 * we've used them all up and understand them all. Except, of course, for the
61 * shared superblock bit, which nobody knows what it does and so is unsupported.
63 #define XFS_SB_VERSION_OKBITS \
64 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
65 ~XFS_SB_VERSION_SHAREDBIT)
68 * There are two words to hold XFS "feature" bits: the original
69 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
70 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
72 * These defines represent bits in sb_features2.
74 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
75 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
76 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
77 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
78 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
79 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
80 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
81 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
83 #define XFS_SB_VERSION2_OKBITS \
84 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
85 XFS_SB_VERSION2_ATTR2BIT | \
86 XFS_SB_VERSION2_PROJID32BIT | \
87 XFS_SB_VERSION2_FTYPE)
89 /* Maximum size of the xfs filesystem label, no terminating NULL */
90 #define XFSLABEL_MAX 12
93 * Superblock - in core version. Must match the ondisk version below.
94 * Must be padded to 64 bit alignment.
96 typedef struct xfs_sb {
97 uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
98 uint32_t sb_blocksize; /* logical block size, bytes */
99 xfs_rfsblock_t sb_dblocks; /* number of data blocks */
100 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
101 xfs_rtbxlen_t sb_rextents; /* number of realtime extents */
102 uuid_t sb_uuid; /* user-visible file system unique id */
103 xfs_fsblock_t sb_logstart; /* starting block of log if internal */
104 xfs_ino_t sb_rootino; /* root inode number */
105 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
106 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
107 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
108 xfs_agblock_t sb_agblocks; /* size of an allocation group */
109 xfs_agnumber_t sb_agcount; /* number of allocation groups */
110 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
111 xfs_extlen_t sb_logblocks; /* number of log blocks */
112 uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
113 uint16_t sb_sectsize; /* volume sector size, bytes */
114 uint16_t sb_inodesize; /* inode size, bytes */
115 uint16_t sb_inopblock; /* inodes per block */
116 char sb_fname[XFSLABEL_MAX]; /* file system name */
117 uint8_t sb_blocklog; /* log2 of sb_blocksize */
118 uint8_t sb_sectlog; /* log2 of sb_sectsize */
119 uint8_t sb_inodelog; /* log2 of sb_inodesize */
120 uint8_t sb_inopblog; /* log2 of sb_inopblock */
121 uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
122 uint8_t sb_rextslog; /* log2 of sb_rextents */
123 uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
124 uint8_t sb_imax_pct; /* max % of fs for inode space */
127 * These fields must remain contiguous. If you really
128 * want to change their layout, make sure you fix the
129 * code in xfs_trans_apply_sb_deltas().
131 uint64_t sb_icount; /* allocated inodes */
132 uint64_t sb_ifree; /* free inodes */
133 uint64_t sb_fdblocks; /* free data blocks */
134 uint64_t sb_frextents; /* free realtime extents */
136 * End contiguous fields.
138 xfs_ino_t sb_uquotino; /* user quota inode */
139 xfs_ino_t sb_gquotino; /* group quota inode */
140 uint16_t sb_qflags; /* quota flags */
141 uint8_t sb_flags; /* misc. flags */
142 uint8_t sb_shared_vn; /* shared version number */
143 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
144 uint32_t sb_unit; /* stripe or raid unit */
145 uint32_t sb_width; /* stripe or raid width */
146 uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
147 uint8_t sb_logsectlog; /* log2 of the log sector size */
148 uint16_t sb_logsectsize; /* sector size for the log, bytes */
149 uint32_t sb_logsunit; /* stripe unit size for the log */
150 uint32_t sb_features2; /* additional feature bits */
153 * bad features2 field as a result of failing to pad the sb structure to
154 * 64 bits. Some machines will be using this field for features2 bits.
155 * Easiest just to mark it bad and not use it for anything else.
157 * This is not kept up to date in memory; it is always overwritten by
158 * the value in sb_features2 when formatting the incore superblock to
161 uint32_t sb_bad_features2;
163 /* version 5 superblock fields start here */
166 uint32_t sb_features_compat;
167 uint32_t sb_features_ro_compat;
168 uint32_t sb_features_incompat;
169 uint32_t sb_features_log_incompat;
171 uint32_t sb_crc; /* superblock crc */
172 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
174 xfs_ino_t sb_pquotino; /* project quota inode */
175 xfs_lsn_t sb_lsn; /* last write sequence */
176 uuid_t sb_meta_uuid; /* metadata file system unique id */
178 /* must be padded to 64 bit alignment */
181 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
184 * Superblock - on disk version. Must match the in core version above.
185 * Must be padded to 64 bit alignment.
188 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
189 __be32 sb_blocksize; /* logical block size, bytes */
190 __be64 sb_dblocks; /* number of data blocks */
191 __be64 sb_rblocks; /* number of realtime blocks */
192 __be64 sb_rextents; /* number of realtime extents */
193 uuid_t sb_uuid; /* user-visible file system unique id */
194 __be64 sb_logstart; /* starting block of log if internal */
195 __be64 sb_rootino; /* root inode number */
196 __be64 sb_rbmino; /* bitmap inode for realtime extents */
197 __be64 sb_rsumino; /* summary inode for rt bitmap */
198 __be32 sb_rextsize; /* realtime extent size, blocks */
199 __be32 sb_agblocks; /* size of an allocation group */
200 __be32 sb_agcount; /* number of allocation groups */
201 __be32 sb_rbmblocks; /* number of rt bitmap blocks */
202 __be32 sb_logblocks; /* number of log blocks */
203 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */
204 __be16 sb_sectsize; /* volume sector size, bytes */
205 __be16 sb_inodesize; /* inode size, bytes */
206 __be16 sb_inopblock; /* inodes per block */
207 char sb_fname[XFSLABEL_MAX]; /* file system name */
208 __u8 sb_blocklog; /* log2 of sb_blocksize */
209 __u8 sb_sectlog; /* log2 of sb_sectsize */
210 __u8 sb_inodelog; /* log2 of sb_inodesize */
211 __u8 sb_inopblog; /* log2 of sb_inopblock */
212 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
213 __u8 sb_rextslog; /* log2 of sb_rextents */
214 __u8 sb_inprogress; /* mkfs is in progress, don't mount */
215 __u8 sb_imax_pct; /* max % of fs for inode space */
218 * These fields must remain contiguous. If you really
219 * want to change their layout, make sure you fix the
220 * code in xfs_trans_apply_sb_deltas().
222 __be64 sb_icount; /* allocated inodes */
223 __be64 sb_ifree; /* free inodes */
224 __be64 sb_fdblocks; /* free data blocks */
225 __be64 sb_frextents; /* free realtime extents */
227 * End contiguous fields.
229 __be64 sb_uquotino; /* user quota inode */
230 __be64 sb_gquotino; /* group quota inode */
231 __be16 sb_qflags; /* quota flags */
232 __u8 sb_flags; /* misc. flags */
233 __u8 sb_shared_vn; /* shared version number */
234 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
235 __be32 sb_unit; /* stripe or raid unit */
236 __be32 sb_width; /* stripe or raid width */
237 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
238 __u8 sb_logsectlog; /* log2 of the log sector size */
239 __be16 sb_logsectsize; /* sector size for the log, bytes */
240 __be32 sb_logsunit; /* stripe unit size for the log */
241 __be32 sb_features2; /* additional feature bits */
243 * bad features2 field as a result of failing to pad the sb
244 * structure to 64 bits. Some machines will be using this field
245 * for features2 bits. Easiest just to mark it bad and not use
246 * it for anything else.
248 __be32 sb_bad_features2;
250 /* version 5 superblock fields start here */
253 __be32 sb_features_compat;
254 __be32 sb_features_ro_compat;
255 __be32 sb_features_incompat;
256 __be32 sb_features_log_incompat;
258 __le32 sb_crc; /* superblock crc */
259 __be32 sb_spino_align; /* sparse inode chunk alignment */
261 __be64 sb_pquotino; /* project quota inode */
262 __be64 sb_lsn; /* last write sequence */
263 uuid_t sb_meta_uuid; /* metadata file system unique id */
265 /* must be padded to 64 bit alignment */
269 * Misc. Flags - warning - these will be cleared by xfs_repair unless
270 * a feature bit is set when the flag is used.
272 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
273 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
276 * define max. shared version we can interoperate with
278 #define XFS_SB_MAX_SHARED_VN 0
280 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
282 static inline bool xfs_sb_is_v5(struct xfs_sb *sbp)
284 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
288 * Detect a mismatched features2 field. Older kernels read/wrote
289 * this into the wrong slot, so to be safe we keep them in sync.
291 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
293 return sbp->sb_bad_features2 != sbp->sb_features2;
296 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
298 return xfs_sb_is_v5(sbp) ||
299 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
302 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
304 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
307 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
309 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
312 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
314 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
315 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
318 static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp)
320 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
321 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
325 * Extended v5 superblock feature masks. These are to be used for new v5
326 * superblock features only.
328 * Compat features are new features that old kernels will not notice or affect
329 * and so can mount read-write without issues.
331 * RO-Compat (read only) are features that old kernels can read but will break
332 * if they write. Hence only read-only mounts of such filesystems are allowed on
333 * kernels that don't support the feature bit.
335 * InCompat features are features which old kernels will not understand and so
338 * Log-InCompat features are for changes to log formats or new transactions that
339 * can't be replayed on older kernels. The fields are set when the filesystem is
340 * mounted, and a clean unmount clears the fields.
342 #define XFS_SB_FEAT_COMPAT_ALL 0
343 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
345 xfs_sb_has_compat_feature(
349 return (sbp->sb_features_compat & feature) != 0;
352 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
353 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
354 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
355 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */
356 #define XFS_SB_FEAT_RO_COMPAT_ALL \
357 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
358 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
359 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
360 XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
361 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
363 xfs_sb_has_ro_compat_feature(
367 return (sbp->sb_features_ro_compat & feature) != 0;
370 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
371 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
372 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
373 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */
374 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */
375 #define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */
376 #define XFS_SB_FEAT_INCOMPAT_ALL \
377 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
378 XFS_SB_FEAT_INCOMPAT_SPINODES| \
379 XFS_SB_FEAT_INCOMPAT_META_UUID| \
380 XFS_SB_FEAT_INCOMPAT_BIGTIME| \
381 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR| \
382 XFS_SB_FEAT_INCOMPAT_NREXT64)
384 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
386 xfs_sb_has_incompat_feature(
390 return (sbp->sb_features_incompat & feature) != 0;
393 #define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
394 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
395 (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
396 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
398 xfs_sb_has_incompat_log_feature(
402 return (sbp->sb_features_log_incompat & feature) != 0;
406 xfs_sb_remove_incompat_log_features(
409 sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
413 xfs_sb_add_incompat_log_features(
415 unsigned int features)
417 sbp->sb_features_log_incompat |= features;
420 static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
422 return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
423 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
427 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
429 return (ino == sbp->sb_uquotino ||
430 ino == sbp->sb_gquotino ||
431 ino == sbp->sb_pquotino);
434 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
435 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
437 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
438 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
439 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
440 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
441 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
444 * File system sector to basic block conversions.
446 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
449 * File system block to basic block conversions.
451 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
452 #define XFS_BB_TO_FSB(mp,bb) \
453 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
454 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
457 * File system block to byte conversions.
459 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
460 #define XFS_B_TO_FSB(mp,b) \
461 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
462 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
465 * Allocation group header
467 * This is divided into three structures, placed in sequential 512-byte
468 * buffers after a copy of the superblock (also in a 512-byte buffer).
470 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
471 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
472 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
473 #define XFS_AGF_VERSION 1
474 #define XFS_AGI_VERSION 1
476 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
477 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
480 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
483 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
486 * The second word of agf_levels in the first a.g. overlaps the EFS
487 * superblock's magic number. Since the magic numbers valid for EFS
488 * are > 64k, our value cannot be confused for an EFS superblock's.
491 typedef struct xfs_agf {
493 * Common allocation group header information
495 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
496 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
497 __be32 agf_seqno; /* sequence # starting from 0 */
498 __be32 agf_length; /* size in blocks of a.g. */
500 * Freespace and rmap information
502 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
503 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
505 __be32 agf_flfirst; /* first freelist block's index */
506 __be32 agf_fllast; /* last freelist block's index */
507 __be32 agf_flcount; /* count of blocks in freelist */
508 __be32 agf_freeblks; /* total free blocks */
510 __be32 agf_longest; /* longest free space */
511 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
512 uuid_t agf_uuid; /* uuid of filesystem */
514 __be32 agf_rmap_blocks; /* rmapbt blocks used */
515 __be32 agf_refcount_blocks; /* refcountbt blocks used */
517 __be32 agf_refcount_root; /* refcount tree root block */
518 __be32 agf_refcount_level; /* refcount btree levels */
521 * reserve some contiguous space for future logged fields before we add
522 * the unlogged fields. This makes the range logging via flags and
523 * structure offsets much simpler.
525 __be64 agf_spare64[14];
527 /* unlogged fields, written during buffer writeback. */
528 __be64 agf_lsn; /* last write sequence */
529 __be32 agf_crc; /* crc of agf sector */
532 /* structure must be padded to 64 bit alignment */
535 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
537 #define XFS_AGF_MAGICNUM (1u << 0)
538 #define XFS_AGF_VERSIONNUM (1u << 1)
539 #define XFS_AGF_SEQNO (1u << 2)
540 #define XFS_AGF_LENGTH (1u << 3)
541 #define XFS_AGF_ROOTS (1u << 4)
542 #define XFS_AGF_LEVELS (1u << 5)
543 #define XFS_AGF_FLFIRST (1u << 6)
544 #define XFS_AGF_FLLAST (1u << 7)
545 #define XFS_AGF_FLCOUNT (1u << 8)
546 #define XFS_AGF_FREEBLKS (1u << 9)
547 #define XFS_AGF_LONGEST (1u << 10)
548 #define XFS_AGF_BTREEBLKS (1u << 11)
549 #define XFS_AGF_UUID (1u << 12)
550 #define XFS_AGF_RMAP_BLOCKS (1u << 13)
551 #define XFS_AGF_REFCOUNT_BLOCKS (1u << 14)
552 #define XFS_AGF_REFCOUNT_ROOT (1u << 15)
553 #define XFS_AGF_REFCOUNT_LEVEL (1u << 16)
554 #define XFS_AGF_SPARE64 (1u << 17)
555 #define XFS_AGF_NUM_BITS 18
556 #define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1)
558 #define XFS_AGF_FLAGS \
559 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
560 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
561 { XFS_AGF_SEQNO, "SEQNO" }, \
562 { XFS_AGF_LENGTH, "LENGTH" }, \
563 { XFS_AGF_ROOTS, "ROOTS" }, \
564 { XFS_AGF_LEVELS, "LEVELS" }, \
565 { XFS_AGF_FLFIRST, "FLFIRST" }, \
566 { XFS_AGF_FLLAST, "FLLAST" }, \
567 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
568 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
569 { XFS_AGF_LONGEST, "LONGEST" }, \
570 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
571 { XFS_AGF_UUID, "UUID" }, \
572 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
573 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
574 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
575 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
576 { XFS_AGF_SPARE64, "SPARE64" }
578 /* disk block (xfs_daddr_t) in the AG */
579 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
580 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
583 * Size of the unlinked inode hash table in the agi.
585 #define XFS_AGI_UNLINKED_BUCKETS 64
587 typedef struct xfs_agi {
589 * Common allocation group header information
591 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
592 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
593 __be32 agi_seqno; /* sequence # starting from 0 */
594 __be32 agi_length; /* size in blocks of a.g. */
597 * Inodes are mapped by interpreting the inode number, so no
598 * mapping data is needed here.
600 __be32 agi_count; /* count of allocated inodes */
601 __be32 agi_root; /* root of inode btree */
602 __be32 agi_level; /* levels in inode btree */
603 __be32 agi_freecount; /* number of free inodes */
605 __be32 agi_newino; /* new inode just allocated */
606 __be32 agi_dirino; /* last directory inode chunk */
608 * Hash table of inodes which have been unlinked but are
609 * still being referenced.
611 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
613 * This marks the end of logging region 1 and start of logging region 2.
615 uuid_t agi_uuid; /* uuid of filesystem */
616 __be32 agi_crc; /* crc of agi sector */
618 __be64 agi_lsn; /* last write sequence */
620 __be32 agi_free_root; /* root of the free inode btree */
621 __be32 agi_free_level;/* levels in free inode btree */
623 __be32 agi_iblocks; /* inobt blocks used */
624 __be32 agi_fblocks; /* finobt blocks used */
626 /* structure must be padded to 64 bit alignment */
629 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
631 #define XFS_AGI_MAGICNUM (1u << 0)
632 #define XFS_AGI_VERSIONNUM (1u << 1)
633 #define XFS_AGI_SEQNO (1u << 2)
634 #define XFS_AGI_LENGTH (1u << 3)
635 #define XFS_AGI_COUNT (1u << 4)
636 #define XFS_AGI_ROOT (1u << 5)
637 #define XFS_AGI_LEVEL (1u << 6)
638 #define XFS_AGI_FREECOUNT (1u << 7)
639 #define XFS_AGI_NEWINO (1u << 8)
640 #define XFS_AGI_DIRINO (1u << 9)
641 #define XFS_AGI_UNLINKED (1u << 10)
642 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
643 #define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1)
644 #define XFS_AGI_FREE_ROOT (1u << 11)
645 #define XFS_AGI_FREE_LEVEL (1u << 12)
646 #define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */
647 #define XFS_AGI_NUM_BITS_R2 14
649 /* disk block (xfs_daddr_t) in the AG */
650 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
651 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
654 * The third a.g. block contains the a.g. freelist, an array
655 * of block pointers to blocks owned by the allocation btree code.
657 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
658 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
659 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr))
662 __be32 agfl_magicnum;
667 } __attribute__((packed));
669 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
671 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
672 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
673 #define XFS_FSB_TO_AGNO(mp,fsbno) \
674 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
675 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
676 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
677 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
678 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
679 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
680 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
683 * For checking for bad ranges of xfs_daddr_t's, covering multiple
684 * allocation groups or a single xfs_daddr_t that's a superblock copy.
686 #define XFS_AG_CHECK_DADDR(mp,d,len) \
688 ASSERT((d) == XFS_SB_DADDR || \
689 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
690 ASSERT(xfs_daddr_to_agno(mp, d) == \
691 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
694 * Realtime bitmap information is accessed by the word, which is currently
695 * stored in host-endian format.
697 union xfs_rtword_raw {
702 * Realtime summary counts are accessed by the word, which is currently
703 * stored in host-endian format.
705 union xfs_suminfo_raw {
713 * Traditional ondisk inode timestamps consist of signed 32-bit counters for
714 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
715 * 1970, which means that the timestamp epoch is the same as the Unix epoch.
716 * Therefore, the ondisk min and max defined here can be used directly to
717 * constrain the incore timestamps on a Unix system. Note that we actually
718 * encode a __be64 value on disk.
720 * When the bigtime feature is enabled, ondisk inode timestamps become an
721 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode
722 * timestamp epoch is the start of the classic timestamp range, which is
723 * Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers
724 * /must/ use the bigtime conversion functions when encoding and decoding raw
727 typedef __be64 xfs_timestamp_t;
729 /* Legacy timestamp encoding format. */
730 struct xfs_legacy_timestamp {
731 __be32 t_sec; /* timestamp seconds */
732 __be32 t_nsec; /* timestamp nanoseconds */
736 * Smallest possible ondisk seconds value with traditional timestamps. This
737 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
739 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
742 * Largest possible ondisk seconds value with traditional timestamps. This
743 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
745 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
748 * Smallest possible ondisk seconds value with bigtime timestamps. This
749 * corresponds (after conversion to a Unix timestamp) with the traditional
750 * minimum timestamp of Dec 13 20:45:52 UTC 1901.
752 #define XFS_BIGTIME_TIME_MIN ((int64_t)0)
755 * Largest supported ondisk seconds value with bigtime timestamps. This
756 * corresponds (after conversion to a Unix timestamp) with an incore timestamp
757 * of Jul 2 20:20:24 UTC 2486.
759 * We round down the ondisk limit so that the bigtime quota and inode max
760 * timestamps will be the same.
762 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
765 * Bigtime epoch is set exactly to the minimum time value that a traditional
766 * 32-bit timestamp can represent when using the Unix epoch as a reference.
767 * Hence the Unix epoch is at a fixed offset into the supported bigtime
770 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
771 * timestamp can represent so we will not lose any fidelity in converting
772 * to/from unix and bigtime timestamps.
774 * The following conversion factor converts a seconds counter from the Unix
775 * epoch to the bigtime epoch.
777 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN)
779 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */
780 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds)
782 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET;
785 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */
786 static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds)
788 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET;
792 * On-disk inode structure.
794 * This is just the header or "dinode core", the inode is expanded to fill a
795 * variable size the leftover area split into a data and an attribute fork.
796 * The format of the data and attribute fork depends on the format of the
797 * inode as indicated by di_format and di_aformat. To access the data and
798 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
801 * There is a very similar struct xfs_log_dinode which matches the layout of
802 * this structure, but is kept in native format instead of big endian.
804 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
805 * padding field for v3 inodes.
807 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
809 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
810 __be16 di_mode; /* mode and type of file */
811 __u8 di_version; /* inode version */
812 __u8 di_format; /* format of di_c data */
813 __be16 di_onlink; /* old number of links to file */
814 __be32 di_uid; /* owner's user id */
815 __be32 di_gid; /* owner's group id */
816 __be32 di_nlink; /* number of links to file */
817 __be16 di_projid_lo; /* lower part of owner's project id */
818 __be16 di_projid_hi; /* higher part owner's project id */
820 /* Number of data fork extents if NREXT64 is set */
821 __be64 di_big_nextents;
823 /* Padding for V3 inodes without NREXT64 set. */
826 /* Padding and inode flush counter for V2 inodes. */
832 xfs_timestamp_t di_atime; /* time last accessed */
833 xfs_timestamp_t di_mtime; /* time last modified */
834 xfs_timestamp_t di_ctime; /* time created/inode modified */
835 __be64 di_size; /* number of bytes in file */
836 __be64 di_nblocks; /* # of direct & btree blocks used */
837 __be32 di_extsize; /* basic/minimum extent size for file */
840 * For V2 inodes and V3 inodes without NREXT64 set, this
841 * is the number of data and attr fork extents.
848 /* Number of attr fork extents if NREXT64 is set. */
850 __be32 di_big_anextents;
851 __be16 di_nrext64_pad;
854 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
855 __s8 di_aformat; /* format of attr fork's data */
856 __be32 di_dmevmask; /* DMIG event mask */
857 __be16 di_dmstate; /* DMIG state info */
858 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
859 __be32 di_gen; /* generation number */
861 /* di_next_unlinked is the only non-core field in the old dinode */
862 __be32 di_next_unlinked;/* agi unlinked list ptr */
864 /* start of the extended dinode, writable fields */
865 __le32 di_crc; /* CRC of the inode */
866 __be64 di_changecount; /* number of attribute changes */
867 __be64 di_lsn; /* flush sequence */
868 __be64 di_flags2; /* more random flags */
869 __be32 di_cowextsize; /* basic cow extent size for file */
870 __u8 di_pad2[12]; /* more padding for future expansion */
872 /* fields only written to during inode creation */
873 xfs_timestamp_t di_crtime; /* time created */
874 __be64 di_ino; /* inode number */
875 uuid_t di_uuid; /* UUID of the filesystem */
877 /* structure must be padded to 64 bit alignment */
880 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
882 #define DI_MAX_FLUSH 0xffff
885 * Size of the core inode on disk. Version 1 and 2 inodes have
886 * the same size, but version 3 has grown a few additional fields.
888 static inline uint xfs_dinode_size(int version)
891 return sizeof(struct xfs_dinode);
892 return offsetof(struct xfs_dinode, di_crc);
896 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
897 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
899 #define XFS_MAXLINK ((1U << 31) - 1U)
902 * Values for di_format
904 * This enum is used in string mapping in xfs_trace.h; please keep the
905 * TRACE_DEFINE_ENUMs for it up to date.
907 enum xfs_dinode_fmt {
908 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
909 XFS_DINODE_FMT_LOCAL, /* bulk data */
910 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
911 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
912 XFS_DINODE_FMT_UUID /* added long ago, but never used */
915 #define XFS_INODE_FORMAT_STR \
916 { XFS_DINODE_FMT_DEV, "dev" }, \
917 { XFS_DINODE_FMT_LOCAL, "local" }, \
918 { XFS_DINODE_FMT_EXTENTS, "extent" }, \
919 { XFS_DINODE_FMT_BTREE, "btree" }, \
920 { XFS_DINODE_FMT_UUID, "uuid" }
923 * Max values for extnum and aextnum.
925 * The original on-disk extent counts were held in signed fields, resulting in
926 * maximum extent counts of 2^31 and 2^15 for the data and attr forks
927 * respectively. Similarly the maximum extent length is limited to 2^21 blocks
928 * by the 21-bit wide blockcount field of a BMBT extent record.
930 * The newly introduced data fork extent counter can hold a 64-bit value,
931 * however the maximum number of extents in a file is also limited to 2^54
932 * extents by the 54-bit wide startoff field of a BMBT extent record.
934 * It is further limited by the maximum supported file size of 2^63
935 * *bytes*. This leads to a maximum extent count for maximally sized filesystem
938 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks
940 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence
941 * 2^48 was chosen as the maximum data fork extent count.
943 * The maximum file size that can be represented by the data fork extent counter
944 * in the worst case occurs when all extents are 1 block in length and each
945 * block is 1KB in size.
947 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and
948 * with 1KB sized blocks, a file can reach upto,
951 * This is much larger than the theoretical maximum size of a directory
952 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB.
954 * Hence, a directory inode can never overflow its data fork extent counter.
956 #define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1))
957 #define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1))
958 #define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1))
959 #define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1))
962 * When we upgrade an inode to the large extent counts, the maximum value by
963 * which the extent count can increase is bound by the change in size of the
964 * on-disk field. No upgrade operation should ever be adding more than a few
965 * tens of extents, so if we get a really large value it is a sign of a code bug
968 #define XFS_MAX_EXTCNT_UPGRADE_NR \
969 min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \
970 XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL)
973 * Inode minimum and maximum sizes.
975 #define XFS_DINODE_MIN_LOG 8
976 #define XFS_DINODE_MAX_LOG 11
977 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
978 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
981 * Inode size for given fs.
983 #define XFS_DINODE_SIZE(mp) \
984 (xfs_has_v3inodes(mp) ? \
985 sizeof(struct xfs_dinode) : \
986 offsetof(struct xfs_dinode, di_crc))
987 #define XFS_LITINO(mp) \
988 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
991 * Inode data & attribute fork sizes, per inode.
993 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
995 #define XFS_DFORK_DSIZE(dip,mp) \
996 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
997 #define XFS_DFORK_ASIZE(dip,mp) \
998 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0)
999 #define XFS_DFORK_SIZE(dip,mp,w) \
1000 ((w) == XFS_DATA_FORK ? \
1001 XFS_DFORK_DSIZE(dip, mp) : \
1002 XFS_DFORK_ASIZE(dip, mp))
1004 #define XFS_DFORK_MAXEXT(dip, mp, w) \
1005 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
1008 * Return pointers to the data or attribute forks.
1010 #define XFS_DFORK_DPTR(dip) \
1011 ((void *)dip + xfs_dinode_size(dip->di_version))
1012 #define XFS_DFORK_APTR(dip) \
1013 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
1014 #define XFS_DFORK_PTR(dip,w) \
1015 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
1017 #define XFS_DFORK_FORMAT(dip,w) \
1018 ((w) == XFS_DATA_FORK ? \
1019 (dip)->di_format : \
1023 * For block and character special files the 32bit dev_t is stored at the
1024 * beginning of the data fork.
1026 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
1028 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
1031 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
1033 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
1037 * Values for di_flags
1039 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1040 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1041 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1042 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1043 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1044 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1045 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1046 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1047 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1048 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1049 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1050 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1051 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1052 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1053 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1054 /* Do not use bit 15, di_flags is legacy and unchanging now */
1056 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1057 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1058 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1059 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1060 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1061 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1062 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1063 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1064 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1065 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1066 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1067 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1068 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1069 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1070 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1072 #define XFS_DIFLAG_ANY \
1073 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1074 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1075 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1076 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1077 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1080 * Values for di_flags2 These start by being exposed to userspace in the upper
1081 * 16 bits of the XFS_XFLAG_s range.
1083 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1084 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1085 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1086 #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */
1087 #define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */
1089 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1090 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1091 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1092 #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT)
1093 #define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT)
1095 #define XFS_DIFLAG2_ANY \
1096 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
1097 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64)
1099 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip)
1101 return dip->di_version >= 3 &&
1102 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME));
1105 static inline bool xfs_dinode_has_large_extent_counts(
1106 const struct xfs_dinode *dip)
1108 return dip->di_version >= 3 &&
1109 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64));
1113 * Inode number format:
1114 * low inopblog bits - offset in block
1115 * next agblklog bits - block number in ag
1116 * next agno_log bits - ag number
1117 * high agno_log-agblklog-inopblog bits - 0
1119 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1120 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1121 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1122 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log)
1123 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1124 #define XFS_INO_BITS(mp) \
1125 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1126 #define XFS_INO_TO_AGNO(mp,i) \
1127 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1128 #define XFS_INO_TO_AGINO(mp,i) \
1129 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1130 #define XFS_INO_TO_AGBNO(mp,i) \
1131 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1132 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1133 #define XFS_INO_TO_OFFSET(mp,i) \
1134 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1135 #define XFS_INO_TO_FSB(mp,i) \
1136 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1137 #define XFS_AGINO_TO_INO(mp,a,i) \
1138 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1139 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1140 #define XFS_AGINO_TO_OFFSET(mp,i) \
1141 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1142 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1143 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1144 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1145 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1147 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1148 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1151 * RealTime Device format definitions
1154 /* Min and max rt extent sizes, specified in bytes */
1155 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1156 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1157 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1160 * Dquot and dquot block format definitions
1162 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1163 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1165 #define XFS_DQTYPE_USER (1u << 0) /* user dquot record */
1166 #define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */
1167 #define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */
1168 #define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */
1170 /* bitmask to determine if this is a user/group/project dquot */
1171 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \
1175 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \
1182 * Traditional quota grace period expiration timers are an unsigned 32-bit
1183 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
1184 * Note that an expiration value of zero means that the quota limit has not
1185 * been reached, and therefore no expiration has been set. Therefore, the
1186 * ondisk min and max defined here can be used directly to constrain the incore
1187 * quota expiration timestamps on a Unix system.
1189 * When bigtime is enabled, we trade two bits of precision to expand the
1190 * expiration timeout range to match that of big inode timestamps. The min and
1191 * max recorded here are the on-disk limits, not a Unix timestamp.
1193 * The grace period for each quota type is stored in the root dquot (id = 0)
1194 * and is applied to a non-root dquot when it exceeds the soft or hard limits.
1195 * The length of quota grace periods are unsigned 32-bit quantities measured in
1196 * units of seconds. A value of zero means to use the default period.
1200 * Smallest possible ondisk quota expiration value with traditional timestamps.
1201 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
1203 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
1206 * Largest possible ondisk quota expiration value with traditional timestamps.
1207 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
1209 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
1212 * Smallest possible ondisk quota expiration value with bigtime timestamps.
1213 * This corresponds (after conversion to a Unix timestamp) with the incore
1214 * expiration of Jan 1 00:00:04 UTC 1970.
1216 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN)
1219 * Largest supported ondisk quota expiration value with bigtime timestamps.
1220 * This corresponds (after conversion to a Unix timestamp) with an incore
1221 * expiration of Jul 2 20:20:24 UTC 2486.
1223 * The ondisk field supports values up to -1U, which corresponds to an incore
1224 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp,
1225 * so we cap the maximum bigtime quota expiration to the max inode timestamp.
1227 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U)
1230 * The following conversion factors assist in converting a quota expiration
1231 * timestamp between the incore and ondisk formats.
1233 #define XFS_DQ_BIGTIME_SHIFT (2)
1234 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
1236 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
1237 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds)
1240 * Round the expiration timestamp up to the nearest bigtime timestamp
1241 * that we can store, to give users the most time to fix problems.
1243 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >>
1244 XFS_DQ_BIGTIME_SHIFT;
1247 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
1248 static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
1250 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT;
1254 * Default quota grace periods, ranging from zero (use the compiled defaults)
1255 * to ~136 years. These are applied to a non-root dquot that has exceeded
1258 #define XFS_DQ_GRACE_MIN ((int64_t)0)
1259 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX)
1261 /* Maximum id value for a quota record */
1262 #define XFS_DQ_ID_MAX (U32_MAX)
1265 * This is the main portion of the on-disk representation of quota information
1266 * for a user. We pad this with some more expansion room to construct the on
1269 struct xfs_disk_dquot {
1270 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1271 __u8 d_version; /* dquot version */
1272 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */
1273 __be32 d_id; /* user,project,group id */
1274 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1275 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1276 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1277 __be64 d_ino_softlimit;/* preferred inode limit */
1278 __be64 d_bcount; /* disk blocks owned by the user */
1279 __be64 d_icount; /* inodes owned by the user */
1280 __be32 d_itimer; /* zero if within inode limits if not,
1281 this is when we refuse service */
1282 __be32 d_btimer; /* similar to above; for disk blocks */
1283 __be16 d_iwarns; /* warnings issued wrt num inodes */
1284 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1285 __be32 d_pad0; /* 64 bit align */
1286 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1287 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1288 __be64 d_rtbcount; /* realtime blocks owned */
1289 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1290 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1295 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1296 * carrying the unnecessary padding would be a waste of memory.
1299 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */
1300 char dd_fill[4];/* filling for posterity */
1303 * These two are only present on filesystems with the CRC bits set.
1305 __be32 dd_crc; /* checksum */
1306 __be64 dd_lsn; /* last modification in log */
1307 uuid_t dd_uuid; /* location information */
1310 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1313 * This defines the unit of allocation of dquots.
1315 * Currently, it is just one file system block, and a 4K blk contains 30
1316 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
1317 * this more dynamic.
1319 * However, if this number is changed, we have to make sure that we don't
1320 * implicitly assume that we do allocations in chunks of a single filesystem
1321 * block in the dquot/xqm code.
1323 * This is part of the ondisk format because the structure size is not a power
1324 * of two, which leaves slack at the end of the disk block.
1326 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
1329 * Remote symlink format and access functions.
1331 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1333 struct xfs_dsymlink_hdr {
1344 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1346 #define XFS_SYMLINK_MAXLEN 1024
1348 * The maximum pathlen is 1024 bytes. Since the minimum file system
1349 * blocksize is 512 bytes, we can get a max of 3 extents back from
1350 * bmapi when crc headers are taken into account.
1352 #define XFS_SYMLINK_MAPS 3
1354 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1355 ((bufsize) - (xfs_has_crc((mp)) ? \
1356 sizeof(struct xfs_dsymlink_hdr) : 0))
1360 * Allocation Btree format definitions
1362 * There are two on-disk btrees, one sorted by blockno and one sorted
1363 * by blockcount and blockno. All blocks look the same to make the code
1364 * simpler; if we have time later, we'll make the optimizations.
1366 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1367 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1368 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1369 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1372 * Data record/key structure
1374 typedef struct xfs_alloc_rec {
1375 __be32 ar_startblock; /* starting block number */
1376 __be32 ar_blockcount; /* count of free blocks */
1377 } xfs_alloc_rec_t, xfs_alloc_key_t;
1379 typedef struct xfs_alloc_rec_incore {
1380 xfs_agblock_t ar_startblock; /* starting block number */
1381 xfs_extlen_t ar_blockcount; /* count of free blocks */
1382 } xfs_alloc_rec_incore_t;
1384 /* btree pointer type */
1385 typedef __be32 xfs_alloc_ptr_t;
1388 * Block numbers in the AG:
1389 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1391 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1392 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1396 * Inode Allocation Btree format definitions
1398 * There is a btree for the inode map per allocation group.
1400 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1401 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1402 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1403 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1405 typedef uint64_t xfs_inofree_t;
1406 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1407 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1408 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1409 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1411 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1412 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1413 #define XFS_INODES_PER_HOLEMASK_BIT \
1414 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1416 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1418 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1422 * The on-disk inode record structure has two formats. The original "full"
1423 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1424 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1427 * The holemask of the sparse record format allows an inode chunk to have holes
1428 * that refer to blocks not owned by the inode record. This facilitates inode
1429 * allocation in the event of severe free space fragmentation.
1431 typedef struct xfs_inobt_rec {
1432 __be32 ir_startino; /* starting inode number */
1435 __be32 ir_freecount; /* count of free inodes */
1438 __be16 ir_holemask;/* hole mask for sparse chunks */
1439 __u8 ir_count; /* total inode count */
1440 __u8 ir_freecount; /* count of free inodes */
1443 __be64 ir_free; /* free inode mask */
1446 typedef struct xfs_inobt_rec_incore {
1447 xfs_agino_t ir_startino; /* starting inode number */
1448 uint16_t ir_holemask; /* hole mask for sparse chunks */
1449 uint8_t ir_count; /* total inode count */
1450 uint8_t ir_freecount; /* count of free inodes (set bits) */
1451 xfs_inofree_t ir_free; /* free inode mask */
1452 } xfs_inobt_rec_incore_t;
1454 static inline bool xfs_inobt_issparse(uint16_t holemask)
1456 /* non-zero holemask represents a sparse rec. */
1463 typedef struct xfs_inobt_key {
1464 __be32 ir_startino; /* starting inode number */
1467 /* btree pointer type */
1468 typedef __be32 xfs_inobt_ptr_t;
1471 * block numbers in the AG.
1473 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1474 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1477 * Reverse mapping btree format definitions
1479 * There is a btree for the reverse map per allocation group
1481 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1484 * Ownership info for an extent. This is used to create reverse-mapping
1487 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1488 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1489 struct xfs_owner_info {
1491 xfs_fileoff_t oi_offset;
1492 unsigned int oi_flags;
1496 * Special owner types.
1498 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1499 * to tell us we have a special owner value. We use these for static metadata
1500 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1502 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1503 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1504 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1505 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1506 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1507 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1508 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1509 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1510 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1511 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1513 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1516 * Data record structure
1518 struct xfs_rmap_rec {
1519 __be32 rm_startblock; /* extent start block */
1520 __be32 rm_blockcount; /* extent length */
1521 __be64 rm_owner; /* extent owner */
1522 __be64 rm_offset; /* offset within the owner */
1527 * rm_offset:63 is the attribute fork flag
1528 * rm_offset:62 is the bmbt block flag
1529 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1530 * rm_offset:54-60 aren't used and should be zero
1531 * rm_offset:0-53 is the block offset within the inode
1533 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1534 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1535 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1537 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1538 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1539 XFS_RMAP_OFF_BMBT_BLOCK | \
1540 XFS_RMAP_OFF_UNWRITTEN)
1541 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1543 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1545 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1546 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1547 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1549 #define RMAPBT_STARTBLOCK_BITLEN 32
1550 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1551 #define RMAPBT_OWNER_BITLEN 64
1552 #define RMAPBT_ATTRFLAG_BITLEN 1
1553 #define RMAPBT_BMBTFLAG_BITLEN 1
1554 #define RMAPBT_EXNTFLAG_BITLEN 1
1555 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1556 #define RMAPBT_OFFSET_BITLEN 54
1561 * We don't use the length for lookups
1563 struct xfs_rmap_key {
1564 __be32 rm_startblock; /* extent start block */
1565 __be64 rm_owner; /* extent owner */
1566 __be64 rm_offset; /* offset within the owner */
1567 } __attribute__((packed));
1569 /* btree pointer type */
1570 typedef __be32 xfs_rmap_ptr_t;
1572 #define XFS_RMAP_BLOCK(mp) \
1573 (xfs_has_finobt(((mp))) ? \
1574 XFS_FIBT_BLOCK(mp) + 1 : \
1575 XFS_IBT_BLOCK(mp) + 1)
1578 * Reference Count Btree format definitions
1581 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1583 unsigned int xfs_refc_block(struct xfs_mount *mp);
1586 * Data record/key structure
1588 * Each record associates a range of physical blocks (starting at
1589 * rc_startblock and ending rc_blockcount blocks later) with a reference
1590 * count (rc_refcount). Extents that are being used to stage a copy on
1591 * write (CoW) operation are recorded in the refcount btree with a
1592 * refcount of 1. All other records must have a refcount > 1 and must
1593 * track an extent mapped only by file data forks.
1595 * Extents with a single owner (attributes, metadata, non-shared file
1596 * data) are not tracked here. Free space is also not tracked here.
1597 * This is consistent with pre-reflink XFS.
1601 * Extents that are being used to stage a copy on write are stored
1602 * in the refcount btree with a refcount of 1 and the upper bit set
1603 * on the startblock. This speeds up mount time deletion of stale
1604 * staging extents because they're all at the right side of the tree.
1606 #define XFS_REFC_COWFLAG (1U << 31)
1607 #define REFCNTBT_COWFLAG_BITLEN 1
1608 #define REFCNTBT_AGBLOCK_BITLEN 31
1610 struct xfs_refcount_rec {
1611 __be32 rc_startblock; /* starting block number */
1612 __be32 rc_blockcount; /* count of blocks */
1613 __be32 rc_refcount; /* number of inodes linked here */
1616 struct xfs_refcount_key {
1617 __be32 rc_startblock; /* starting block number */
1620 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1621 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1623 /* btree pointer type */
1624 typedef __be32 xfs_refcount_ptr_t;
1628 * BMAP Btree format definitions
1630 * This includes both the root block definition that sits inside an inode fork
1631 * and the record/pointer formats for the leaf/node in the blocks.
1633 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1634 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1637 * Bmap root header, on-disk form only.
1639 typedef struct xfs_bmdr_block {
1640 __be16 bb_level; /* 0 is a leaf */
1641 __be16 bb_numrecs; /* current # of data records */
1645 * Bmap btree record and extent descriptor.
1646 * l0:63 is an extent flag (value 1 indicates non-normal).
1647 * l0:9-62 are startoff.
1648 * l0:0-8 and l1:21-63 are startblock.
1649 * l1:0-20 are blockcount.
1651 #define BMBT_EXNTFLAG_BITLEN 1
1652 #define BMBT_STARTOFF_BITLEN 54
1653 #define BMBT_STARTBLOCK_BITLEN 52
1654 #define BMBT_BLOCKCOUNT_BITLEN 21
1656 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
1657 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
1659 #define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
1662 * bmbt records have a file offset (block) field that is 54 bits wide, so this
1663 * is the largest xfs_fileoff_t that we ever expect to see.
1665 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
1667 typedef struct xfs_bmbt_rec {
1671 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1672 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1675 * Values and macros for delayed-allocation startblock fields.
1677 #define STARTBLOCKVALBITS 17
1678 #define STARTBLOCKMASKBITS (15 + 20)
1679 #define STARTBLOCKMASK \
1680 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1682 static inline int isnullstartblock(xfs_fsblock_t x)
1684 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1687 static inline xfs_fsblock_t nullstartblock(int k)
1689 ASSERT(k < (1 << STARTBLOCKVALBITS));
1690 return STARTBLOCKMASK | (k);
1693 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1695 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1699 * Key structure for non-leaf levels of the tree.
1701 typedef struct xfs_bmbt_key {
1702 __be64 br_startoff; /* starting file offset */
1703 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1705 /* btree pointer type */
1706 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1710 * Generic Btree block format definitions
1712 * This is a combination of the actual format used on disk for short and long
1713 * format btrees. The first three fields are shared by both format, but the
1714 * pointers are different and should be used with care.
1716 * To get the size of the actual short or long form headers please use the size
1717 * macros below. Never use sizeof(xfs_btree_block).
1719 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1720 * with the crc feature bit, and all accesses to them must be conditional on
1723 /* short form block header */
1724 struct xfs_btree_block_shdr {
1735 /* long form block header */
1736 struct xfs_btree_block_lhdr {
1745 __be32 bb_pad; /* padding for alignment */
1748 struct xfs_btree_block {
1749 __be32 bb_magic; /* magic number for block type */
1750 __be16 bb_level; /* 0 is a leaf */
1751 __be16 bb_numrecs; /* current # of data records */
1753 struct xfs_btree_block_shdr s;
1754 struct xfs_btree_block_lhdr l;
1758 /* size of a short form block */
1759 #define XFS_BTREE_SBLOCK_LEN \
1760 (offsetof(struct xfs_btree_block, bb_u) + \
1761 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1762 /* size of a long form block */
1763 #define XFS_BTREE_LBLOCK_LEN \
1764 (offsetof(struct xfs_btree_block, bb_u) + \
1765 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1767 /* sizes of CRC enabled btree blocks */
1768 #define XFS_BTREE_SBLOCK_CRC_LEN \
1769 (offsetof(struct xfs_btree_block, bb_u) + \
1770 sizeof(struct xfs_btree_block_shdr))
1771 #define XFS_BTREE_LBLOCK_CRC_LEN \
1772 (offsetof(struct xfs_btree_block, bb_u) + \
1773 sizeof(struct xfs_btree_block_lhdr))
1775 #define XFS_BTREE_SBLOCK_CRC_OFF \
1776 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1777 #define XFS_BTREE_LBLOCK_CRC_OFF \
1778 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1781 * On-disk XFS access control list structure.
1783 struct xfs_acl_entry {
1787 __be16 ae_pad; /* fill the implicit hole in the structure */
1792 struct xfs_acl_entry acl_entry[];
1796 * The number of ACL entries allowed is defined by the on-disk format.
1797 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1798 * limited only by the maximum size of the xattr that stores the information.
1800 #define XFS_ACL_MAX_ENTRIES(mp) \
1802 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1803 sizeof(struct xfs_acl_entry) \
1806 #define XFS_ACL_SIZE(cnt) \
1807 (sizeof(struct xfs_acl) + \
1808 sizeof(struct xfs_acl_entry) * cnt)
1810 #define XFS_ACL_MAX_SIZE(mp) \
1811 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1814 /* On-disk XFS extended attribute names */
1815 #define SGI_ACL_FILE "SGI_ACL_FILE"
1816 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1817 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1818 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1820 #endif /* __XFS_FORMAT_H__ */