2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 * Fits into a sector-sized buffer at address 0 of each allocation group.
24 * Only the first of these is ever updated except during growfs.
31 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
32 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
33 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
34 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
35 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
36 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
37 #define XFS_SB_VERSION_NUMBITS 0x000f
38 #define XFS_SB_VERSION_ALLFBITS 0xfff0
39 #define XFS_SB_VERSION_ATTRBIT 0x0010
40 #define XFS_SB_VERSION_NLINKBIT 0x0020
41 #define XFS_SB_VERSION_QUOTABIT 0x0040
42 #define XFS_SB_VERSION_ALIGNBIT 0x0080
43 #define XFS_SB_VERSION_DALIGNBIT 0x0100
44 #define XFS_SB_VERSION_SHAREDBIT 0x0200
45 #define XFS_SB_VERSION_LOGV2BIT 0x0400
46 #define XFS_SB_VERSION_SECTORBIT 0x0800
47 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
48 #define XFS_SB_VERSION_DIRV2BIT 0x2000
49 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
50 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
53 * Supported feature bit list is just all bits in the versionnum field because
54 * we've used them all up and understand them all.
56 #define XFS_SB_VERSION_OKBITS \
57 (XFS_SB_VERSION_NUMBITS | \
58 XFS_SB_VERSION_ALLFBITS)
61 * There are two words to hold XFS "feature" bits: the original
62 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
63 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
65 * These defines represent bits in sb_features2.
67 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
68 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
69 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
70 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
71 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
72 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
73 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
74 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
76 #define XFS_SB_VERSION2_OKBITS \
77 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
78 XFS_SB_VERSION2_ATTR2BIT | \
79 XFS_SB_VERSION2_PROJID32BIT | \
80 XFS_SB_VERSION2_FTYPE)
83 * Superblock - in core version. Must match the ondisk version below.
84 * Must be padded to 64 bit alignment.
86 typedef struct xfs_sb {
87 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
88 __uint32_t sb_blocksize; /* logical block size, bytes */
89 xfs_drfsbno_t sb_dblocks; /* number of data blocks */
90 xfs_drfsbno_t sb_rblocks; /* number of realtime blocks */
91 xfs_drtbno_t sb_rextents; /* number of realtime extents */
92 uuid_t sb_uuid; /* file system unique id */
93 xfs_dfsbno_t sb_logstart; /* starting block of log if internal */
94 xfs_ino_t sb_rootino; /* root inode number */
95 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
96 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
97 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
98 xfs_agblock_t sb_agblocks; /* size of an allocation group */
99 xfs_agnumber_t sb_agcount; /* number of allocation groups */
100 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
101 xfs_extlen_t sb_logblocks; /* number of log blocks */
102 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
103 __uint16_t sb_sectsize; /* volume sector size, bytes */
104 __uint16_t sb_inodesize; /* inode size, bytes */
105 __uint16_t sb_inopblock; /* inodes per block */
106 char sb_fname[12]; /* file system name */
107 __uint8_t sb_blocklog; /* log2 of sb_blocksize */
108 __uint8_t sb_sectlog; /* log2 of sb_sectsize */
109 __uint8_t sb_inodelog; /* log2 of sb_inodesize */
110 __uint8_t sb_inopblog; /* log2 of sb_inopblock */
111 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
112 __uint8_t sb_rextslog; /* log2 of sb_rextents */
113 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
114 __uint8_t sb_imax_pct; /* max % of fs for inode space */
117 * These fields must remain contiguous. If you really
118 * want to change their layout, make sure you fix the
119 * code in xfs_trans_apply_sb_deltas().
121 __uint64_t sb_icount; /* allocated inodes */
122 __uint64_t sb_ifree; /* free inodes */
123 __uint64_t sb_fdblocks; /* free data blocks */
124 __uint64_t sb_frextents; /* free realtime extents */
126 * End contiguous fields.
128 xfs_ino_t sb_uquotino; /* user quota inode */
129 xfs_ino_t sb_gquotino; /* group quota inode */
130 __uint16_t sb_qflags; /* quota flags */
131 __uint8_t sb_flags; /* misc. flags */
132 __uint8_t sb_shared_vn; /* shared version number */
133 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
134 __uint32_t sb_unit; /* stripe or raid unit */
135 __uint32_t sb_width; /* stripe or raid width */
136 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
137 __uint8_t sb_logsectlog; /* log2 of the log sector size */
138 __uint16_t sb_logsectsize; /* sector size for the log, bytes */
139 __uint32_t sb_logsunit; /* stripe unit size for the log */
140 __uint32_t sb_features2; /* additional feature bits */
143 * bad features2 field as a result of failing to pad the sb
144 * structure to 64 bits. Some machines will be using this field
145 * for features2 bits. Easiest just to mark it bad and not use
146 * it for anything else.
148 __uint32_t sb_bad_features2;
150 /* version 5 superblock fields start here */
153 __uint32_t sb_features_compat;
154 __uint32_t sb_features_ro_compat;
155 __uint32_t sb_features_incompat;
156 __uint32_t sb_features_log_incompat;
158 __uint32_t sb_crc; /* superblock crc */
161 xfs_ino_t sb_pquotino; /* project quota inode */
162 xfs_lsn_t sb_lsn; /* last write sequence */
164 /* must be padded to 64 bit alignment */
167 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
170 * Superblock - on disk version. Must match the in core version above.
171 * Must be padded to 64 bit alignment.
173 typedef struct xfs_dsb {
174 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
175 __be32 sb_blocksize; /* logical block size, bytes */
176 __be64 sb_dblocks; /* number of data blocks */
177 __be64 sb_rblocks; /* number of realtime blocks */
178 __be64 sb_rextents; /* number of realtime extents */
179 uuid_t sb_uuid; /* file system unique id */
180 __be64 sb_logstart; /* starting block of log if internal */
181 __be64 sb_rootino; /* root inode number */
182 __be64 sb_rbmino; /* bitmap inode for realtime extents */
183 __be64 sb_rsumino; /* summary inode for rt bitmap */
184 __be32 sb_rextsize; /* realtime extent size, blocks */
185 __be32 sb_agblocks; /* size of an allocation group */
186 __be32 sb_agcount; /* number of allocation groups */
187 __be32 sb_rbmblocks; /* number of rt bitmap blocks */
188 __be32 sb_logblocks; /* number of log blocks */
189 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */
190 __be16 sb_sectsize; /* volume sector size, bytes */
191 __be16 sb_inodesize; /* inode size, bytes */
192 __be16 sb_inopblock; /* inodes per block */
193 char sb_fname[12]; /* file system name */
194 __u8 sb_blocklog; /* log2 of sb_blocksize */
195 __u8 sb_sectlog; /* log2 of sb_sectsize */
196 __u8 sb_inodelog; /* log2 of sb_inodesize */
197 __u8 sb_inopblog; /* log2 of sb_inopblock */
198 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
199 __u8 sb_rextslog; /* log2 of sb_rextents */
200 __u8 sb_inprogress; /* mkfs is in progress, don't mount */
201 __u8 sb_imax_pct; /* max % of fs for inode space */
204 * These fields must remain contiguous. If you really
205 * want to change their layout, make sure you fix the
206 * code in xfs_trans_apply_sb_deltas().
208 __be64 sb_icount; /* allocated inodes */
209 __be64 sb_ifree; /* free inodes */
210 __be64 sb_fdblocks; /* free data blocks */
211 __be64 sb_frextents; /* free realtime extents */
213 * End contiguous fields.
215 __be64 sb_uquotino; /* user quota inode */
216 __be64 sb_gquotino; /* group quota inode */
217 __be16 sb_qflags; /* quota flags */
218 __u8 sb_flags; /* misc. flags */
219 __u8 sb_shared_vn; /* shared version number */
220 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
221 __be32 sb_unit; /* stripe or raid unit */
222 __be32 sb_width; /* stripe or raid width */
223 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
224 __u8 sb_logsectlog; /* log2 of the log sector size */
225 __be16 sb_logsectsize; /* sector size for the log, bytes */
226 __be32 sb_logsunit; /* stripe unit size for the log */
227 __be32 sb_features2; /* additional feature bits */
229 * bad features2 field as a result of failing to pad the sb
230 * structure to 64 bits. Some machines will be using this field
231 * for features2 bits. Easiest just to mark it bad and not use
232 * it for anything else.
234 __be32 sb_bad_features2;
236 /* version 5 superblock fields start here */
239 __be32 sb_features_compat;
240 __be32 sb_features_ro_compat;
241 __be32 sb_features_incompat;
242 __be32 sb_features_log_incompat;
244 __le32 sb_crc; /* superblock crc */
247 __be64 sb_pquotino; /* project quota inode */
248 __be64 sb_lsn; /* last write sequence */
250 /* must be padded to 64 bit alignment */
254 * Sequence number values for the fields.
257 XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
258 XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
259 XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
260 XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
261 XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
262 XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
263 XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
264 XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
265 XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
266 XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
267 XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
268 XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
269 XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
270 XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT,
271 XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD,
272 XFS_SBS_PQUOTINO, XFS_SBS_LSN,
277 * Mask values, defined based on the xfs_sb_field_t values.
278 * Only define the ones we're using.
280 #define XFS_SB_MVAL(x) (1LL << XFS_SBS_ ## x)
281 #define XFS_SB_UUID XFS_SB_MVAL(UUID)
282 #define XFS_SB_FNAME XFS_SB_MVAL(FNAME)
283 #define XFS_SB_ROOTINO XFS_SB_MVAL(ROOTINO)
284 #define XFS_SB_RBMINO XFS_SB_MVAL(RBMINO)
285 #define XFS_SB_RSUMINO XFS_SB_MVAL(RSUMINO)
286 #define XFS_SB_VERSIONNUM XFS_SB_MVAL(VERSIONNUM)
287 #define XFS_SB_UQUOTINO XFS_SB_MVAL(UQUOTINO)
288 #define XFS_SB_GQUOTINO XFS_SB_MVAL(GQUOTINO)
289 #define XFS_SB_QFLAGS XFS_SB_MVAL(QFLAGS)
290 #define XFS_SB_SHARED_VN XFS_SB_MVAL(SHARED_VN)
291 #define XFS_SB_UNIT XFS_SB_MVAL(UNIT)
292 #define XFS_SB_WIDTH XFS_SB_MVAL(WIDTH)
293 #define XFS_SB_ICOUNT XFS_SB_MVAL(ICOUNT)
294 #define XFS_SB_IFREE XFS_SB_MVAL(IFREE)
295 #define XFS_SB_FDBLOCKS XFS_SB_MVAL(FDBLOCKS)
296 #define XFS_SB_FEATURES2 XFS_SB_MVAL(FEATURES2)
297 #define XFS_SB_BAD_FEATURES2 XFS_SB_MVAL(BAD_FEATURES2)
298 #define XFS_SB_FEATURES_COMPAT XFS_SB_MVAL(FEATURES_COMPAT)
299 #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
300 #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
301 #define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT)
302 #define XFS_SB_CRC XFS_SB_MVAL(CRC)
303 #define XFS_SB_PQUOTINO XFS_SB_MVAL(PQUOTINO)
304 #define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT)
305 #define XFS_SB_ALL_BITS ((1LL << XFS_SB_NUM_BITS) - 1)
306 #define XFS_SB_MOD_BITS \
307 (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
308 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
309 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
310 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
311 XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
312 XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \
313 XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO)
317 * Misc. Flags - warning - these will be cleared by xfs_repair unless
318 * a feature bit is set when the flag is used.
320 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
321 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
324 * define max. shared version we can interoperate with
326 #define XFS_SB_MAX_SHARED_VN 0
328 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
331 * The first XFS version we support is a v4 superblock with V2 directories.
333 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
335 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
338 /* check for unknown features in the fs */
339 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
340 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
341 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
344 /* We don't support shared superblocks - nobody knows what it is */
345 if (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT)
351 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
353 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
355 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
356 return xfs_sb_good_v4_features(sbp);
361 * Detect a mismatched features2 field. Older kernels read/wrote
362 * this into the wrong slot, so to be safe we keep them in sync.
364 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
366 return sbp->sb_bad_features2 != sbp->sb_features2;
369 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
371 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
374 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
376 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
379 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
381 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
384 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
386 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
389 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
391 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
392 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
395 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
397 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
400 static inline bool xfs_sb_version_hasshared(struct xfs_sb *sbp)
402 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
403 (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
406 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
408 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
409 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
412 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
414 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
415 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
418 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
420 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
423 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
425 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
428 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
430 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
431 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
435 * sb_features2 bit version macros.
437 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
439 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
440 (xfs_sb_version_hasmorebits(sbp) &&
441 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
444 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
446 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
447 (xfs_sb_version_hasmorebits(sbp) &&
448 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
451 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
453 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
454 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
455 sbp->sb_bad_features2 |= XFS_SB_VERSION2_ATTR2BIT;
458 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
460 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
461 sbp->sb_bad_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
462 if (!sbp->sb_features2)
463 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
466 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
468 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
469 (xfs_sb_version_hasmorebits(sbp) &&
470 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
473 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
475 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
476 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
477 sbp->sb_bad_features2 |= XFS_SB_VERSION2_PROJID32BIT;
481 * Extended v5 superblock feature masks. These are to be used for new v5
482 * superblock features only.
484 * Compat features are new features that old kernels will not notice or affect
485 * and so can mount read-write without issues.
487 * RO-Compat (read only) are features that old kernels can read but will break
488 * if they write. Hence only read-only mounts of such filesystems are allowed on
489 * kernels that don't support the feature bit.
491 * InCompat features are features which old kernels will not understand and so
494 * Log-InCompat features are for changes to log formats or new transactions that
495 * can't be replayed on older kernels. The fields are set when the filesystem is
496 * mounted, and a clean unmount clears the fields.
498 #define XFS_SB_FEAT_COMPAT_ALL 0
499 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
501 xfs_sb_has_compat_feature(
505 return (sbp->sb_features_compat & feature) != 0;
508 #define XFS_SB_FEAT_RO_COMPAT_ALL 0
509 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
511 xfs_sb_has_ro_compat_feature(
515 return (sbp->sb_features_ro_compat & feature) != 0;
518 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
519 #define XFS_SB_FEAT_INCOMPAT_ALL \
520 (XFS_SB_FEAT_INCOMPAT_FTYPE)
522 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
524 xfs_sb_has_incompat_feature(
528 return (sbp->sb_features_incompat & feature) != 0;
531 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
532 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
534 xfs_sb_has_incompat_log_feature(
538 return (sbp->sb_features_log_incompat & feature) != 0;
542 * V5 superblock specific feature checks
544 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
546 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
549 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
551 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
554 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
556 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
557 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
558 (xfs_sb_version_hasmorebits(sbp) &&
559 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
563 * end of superblock version macros
567 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
569 return (ino == sbp->sb_uquotino ||
570 ino == sbp->sb_gquotino ||
571 ino == sbp->sb_pquotino);
574 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
575 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
576 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
578 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
579 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
580 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
581 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
582 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
585 * File system sector to basic block conversions.
587 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
590 * File system block to basic block conversions.
592 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
593 #define XFS_BB_TO_FSB(mp,bb) \
594 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
595 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
598 * File system block to byte conversions.
600 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
601 #define XFS_B_TO_FSB(mp,b) \
602 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
603 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
604 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
607 * perag get/put wrappers for ref counting
609 extern struct xfs_perag *xfs_perag_get(struct xfs_mount *, xfs_agnumber_t);
610 extern struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *, xfs_agnumber_t,
612 extern void xfs_perag_put(struct xfs_perag *pag);
613 extern int xfs_initialize_perag_data(struct xfs_mount *, xfs_agnumber_t);
615 extern void xfs_sb_calc_crc(struct xfs_buf *);
616 extern void xfs_mod_sb(struct xfs_trans *, __int64_t);
617 extern void xfs_sb_mount_common(struct xfs_mount *, struct xfs_sb *);
618 extern void xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
619 extern void xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
620 extern void xfs_sb_quota_from_disk(struct xfs_sb *sbp);
622 #endif /* __XFS_SB_H__ */