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xfs: use sparse chunk alignment for min. inode allocation requirement
[deliverable/linux.git] / fs / xfs / libxfs / xfs_format.h
CommitLineData
6ca1c906
DC		 1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18#ifndef __XFS_FORMAT_H__
19#define __XFS_FORMAT_H__
20
21/*
22 * XFS On Disk Format Definitions
23 *
24 * This header file defines all the on-disk format definitions for
25 * general XFS objects. Directory and attribute related objects are defined in
26 * xfs_da_format.h, which log and log item formats are defined in
27 * xfs_log_format.h. Everything else goes here.
28 */
29
1fb7e48d
DC		 30struct xfs_mount;
31struct xfs_trans;
32struct xfs_inode;
33struct xfs_buf;
34struct xfs_ifork;
35
bb58e618
CH		 36/*
37 * Super block
38 * Fits into a sector-sized buffer at address 0 of each allocation group.
39 * Only the first of these is ever updated except during growfs.
40 */
41#define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
42#define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
43#define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
44#define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
45#define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
46#define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
47#define XFS_SB_VERSION_NUMBITS 0x000f
48#define XFS_SB_VERSION_ALLFBITS 0xfff0
49#define XFS_SB_VERSION_ATTRBIT 0x0010
50#define XFS_SB_VERSION_NLINKBIT 0x0020
51#define XFS_SB_VERSION_QUOTABIT 0x0040
52#define XFS_SB_VERSION_ALIGNBIT 0x0080
53#define XFS_SB_VERSION_DALIGNBIT 0x0100
54#define XFS_SB_VERSION_SHAREDBIT 0x0200
55#define XFS_SB_VERSION_LOGV2BIT 0x0400
56#define XFS_SB_VERSION_SECTORBIT 0x0800
57#define XFS_SB_VERSION_EXTFLGBIT 0x1000
58#define XFS_SB_VERSION_DIRV2BIT 0x2000
59#define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
60#define XFS_SB_VERSION_MOREBITSBIT 0x8000
61
62/*
63 * Supported feature bit list is just all bits in the versionnum field because
64 * we've used them all up and understand them all. Except, of course, for the
65 * shared superblock bit, which nobody knows what it does and so is unsupported.
66 */
67#define XFS_SB_VERSION_OKBITS \
68 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
69 ~XFS_SB_VERSION_SHAREDBIT)
70
71/*
72 * There are two words to hold XFS "feature" bits: the original
73 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
75 *
76 * These defines represent bits in sb_features2.
77 */
78#define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
79#define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
80#define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
81#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
82#define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
83#define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
84#define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
85#define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
86
87#define XFS_SB_VERSION2_OKBITS \
88 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
89 XFS_SB_VERSION2_ATTR2BIT | \
90 XFS_SB_VERSION2_PROJID32BIT | \
91 XFS_SB_VERSION2_FTYPE)
92
93/*
94 * Superblock - in core version. Must match the ondisk version below.
95 * Must be padded to 64 bit alignment.
96 */
97typedef struct xfs_sb {
98 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
99 __uint32_t sb_blocksize; /* logical block size, bytes */
100 xfs_rfsblock_t sb_dblocks; /* number of data blocks */
101 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
102 xfs_rtblock_t sb_rextents; /* number of realtime extents */
103 uuid_t sb_uuid; /* file system unique id */
104 xfs_fsblock_t sb_logstart; /* starting block of log if internal */
105 xfs_ino_t sb_rootino; /* root inode number */
106 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
107 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
108 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
109 xfs_agblock_t sb_agblocks; /* size of an allocation group */
110 xfs_agnumber_t sb_agcount; /* number of allocation groups */
111 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
112 xfs_extlen_t sb_logblocks; /* number of log blocks */
113 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
114 __uint16_t sb_sectsize; /* volume sector size, bytes */
115 __uint16_t sb_inodesize; /* inode size, bytes */
116 __uint16_t sb_inopblock; /* inodes per block */
117 char sb_fname[12]; /* file system name */
118 __uint8_t sb_blocklog; /* log2 of sb_blocksize */
119 __uint8_t sb_sectlog; /* log2 of sb_sectsize */
120 __uint8_t sb_inodelog; /* log2 of sb_inodesize */
121 __uint8_t sb_inopblog; /* log2 of sb_inopblock */
122 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
123 __uint8_t sb_rextslog; /* log2 of sb_rextents */
124 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
125 __uint8_t sb_imax_pct; /* max % of fs for inode space */
126 /* statistics */
127 /*
128 * These fields must remain contiguous. If you really
129 * want to change their layout, make sure you fix the
130 * code in xfs_trans_apply_sb_deltas().
131 */
132 __uint64_t sb_icount; /* allocated inodes */
133 __uint64_t sb_ifree; /* free inodes */
134 __uint64_t sb_fdblocks; /* free data blocks */
135 __uint64_t sb_frextents; /* free realtime extents */
136 /*
137 * End contiguous fields.
138 */
139 xfs_ino_t sb_uquotino; /* user quota inode */
140 xfs_ino_t sb_gquotino; /* group quota inode */
141 __uint16_t sb_qflags; /* quota flags */
142 __uint8_t sb_flags; /* misc. flags */
143 __uint8_t sb_shared_vn; /* shared version number */
144 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
145 __uint32_t sb_unit; /* stripe or raid unit */
146 __uint32_t sb_width; /* stripe or raid width */
147 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
148 __uint8_t sb_logsectlog; /* log2 of the log sector size */
149 __uint16_t sb_logsectsize; /* sector size for the log, bytes */
150 __uint32_t sb_logsunit; /* stripe unit size for the log */
151 __uint32_t sb_features2; /* additional feature bits */
152
153 /*
074e427b
DC		 154 * bad features2 field as a result of failing to pad the sb structure to
155 * 64 bits. Some machines will be using this field for features2 bits.
156 * Easiest just to mark it bad and not use it for anything else.
157 *
158 * This is not kept up to date in memory; it is always overwritten by
159 * the value in sb_features2 when formatting the incore superblock to
160 * the disk buffer.
bb58e618
CH		 161 */
162 __uint32_t sb_bad_features2;
163
164 /* version 5 superblock fields start here */
165
166 /* feature masks */
167 __uint32_t sb_features_compat;
168 __uint32_t sb_features_ro_compat;
169 __uint32_t sb_features_incompat;
170 __uint32_t sb_features_log_incompat;
171
172 __uint32_t sb_crc; /* superblock crc */
fb4f2b4e 173 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
bb58e618
CH		 174
175 xfs_ino_t sb_pquotino; /* project quota inode */
176 xfs_lsn_t sb_lsn; /* last write sequence */
177
178 /* must be padded to 64 bit alignment */
179} xfs_sb_t;
180
181#define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
182
183/*
184 * Superblock - on disk version. Must match the in core version above.
185 * Must be padded to 64 bit alignment.
186 */
187typedef 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; /* 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[12]; /* 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 */
216 /* statistics */
217 /*
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().
221 */
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 */
226 /*
227 * End contiguous fields.
228 */
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 */
242 /*
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.
247 */
248 __be32 sb_bad_features2;
249
250 /* version 5 superblock fields start here */
251
252 /* feature masks */
253 __be32 sb_features_compat;
254 __be32 sb_features_ro_compat;
255 __be32 sb_features_incompat;
256 __be32 sb_features_log_incompat;
257
258 __le32 sb_crc; /* superblock crc */
fb4f2b4e 259 __be32 sb_spino_align; /* sparse inode chunk alignment */
bb58e618
CH		 260
261 __be64 sb_pquotino; /* project quota inode */
262 __be64 sb_lsn; /* last write sequence */
263
264 /* must be padded to 64 bit alignment */
265} xfs_dsb_t;
266
bb58e618
CH		 267
268/*
269 * Misc. Flags - warning - these will be cleared by xfs_repair unless
270 * a feature bit is set when the flag is used.
271 */
272#define XFS_SBF_NOFLAGS 0x00 /* no flags set */
273#define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
274
275/*
276 * define max. shared version we can interoperate with
277 */
278#define XFS_SB_MAX_SHARED_VN 0
279
280#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
281
282/*
283 * The first XFS version we support is a v4 superblock with V2 directories.
284 */
285static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
286{
287 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
288 return false;
289
290 /* check for unknown features in the fs */
291 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
292 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
293 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
294 return false;
295
296 return true;
297}
298
299static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
300{
301 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
302 return true;
303 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
304 return xfs_sb_good_v4_features(sbp);
305 return false;
306}
307
308/*
309 * Detect a mismatched features2 field. Older kernels read/wrote
310 * this into the wrong slot, so to be safe we keep them in sync.
311 */
312static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
313{
314 return sbp->sb_bad_features2 != sbp->sb_features2;
315}
316
317static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
318{
319 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
320}
321
322static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
323{
324 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
325}
326
327static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
328{
329 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
330}
331
332static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
333{
334 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
335}
336
337static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
338{
339 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
340 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
341}
342
343static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
344{
345 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
346}
347
348static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
349{
350 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
351 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
352}
353
354static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
355{
356 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
357 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
358}
359
360static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
361{
362 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
363}
364
365static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
366{
367 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
368}
369
370static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
371{
372 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
373 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
374}
375
376/*
377 * sb_features2 bit version macros.
378 */
379static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
380{
381 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
382 (xfs_sb_version_hasmorebits(sbp) &&
383 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
384}
385
386static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
387{
388 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
389 (xfs_sb_version_hasmorebits(sbp) &&
390 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
391}
392
393static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
394{
395 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
396 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
bb58e618
CH		 397}
398
399static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
400{
401 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
bb58e618
CH		 402 if (!sbp->sb_features2)
403 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
404}
405
406static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
407{
408 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
409 (xfs_sb_version_hasmorebits(sbp) &&
410 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
411}
412
413static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
414{
415 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
416 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
bb58e618
CH		 417}
418
419/*
420 * Extended v5 superblock feature masks. These are to be used for new v5
421 * superblock features only.
422 *
423 * Compat features are new features that old kernels will not notice or affect
424 * and so can mount read-write without issues.
425 *
426 * RO-Compat (read only) are features that old kernels can read but will break
427 * if they write. Hence only read-only mounts of such filesystems are allowed on
428 * kernels that don't support the feature bit.
429 *
430 * InCompat features are features which old kernels will not understand and so
431 * must not mount.
432 *
433 * Log-InCompat features are for changes to log formats or new transactions that
434 * can't be replayed on older kernels. The fields are set when the filesystem is
435 * mounted, and a clean unmount clears the fields.
436 */
437#define XFS_SB_FEAT_COMPAT_ALL 0
438#define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
439static inline bool
440xfs_sb_has_compat_feature(
441 struct xfs_sb *sbp,
442 __uint32_t feature)
443{
444 return (sbp->sb_features_compat & feature) != 0;
445}
446
447#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
448#define XFS_SB_FEAT_RO_COMPAT_ALL \
449 (XFS_SB_FEAT_RO_COMPAT_FINOBT)
450#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
451static inline bool
452xfs_sb_has_ro_compat_feature(
453 struct xfs_sb *sbp,
454 __uint32_t feature)
455{
456 return (sbp->sb_features_ro_compat & feature) != 0;
457}
458
459#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
460#define XFS_SB_FEAT_INCOMPAT_ALL \
461 (XFS_SB_FEAT_INCOMPAT_FTYPE)
462
463#define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
464static inline bool
465xfs_sb_has_incompat_feature(
466 struct xfs_sb *sbp,
467 __uint32_t feature)
468{
469 return (sbp->sb_features_incompat & feature) != 0;
470}
471
472#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
473#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
474static inline bool
475xfs_sb_has_incompat_log_feature(
476 struct xfs_sb *sbp,
477 __uint32_t feature)
478{
479 return (sbp->sb_features_log_incompat & feature) != 0;
480}
481
482/*
483 * V5 superblock specific feature checks
484 */
485static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
486{
487 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
488}
489
490static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
491{
492 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
493}
494
495static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
496{
497 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
498 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
499 (xfs_sb_version_hasmorebits(sbp) &&
500 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
501}
502
503static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
504{
505 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
506 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
507}
508
509/*
510 * end of superblock version macros
511 */
512
513static inline bool
514xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
515{
516 return (ino == sbp->sb_uquotino ||
517 ino == sbp->sb_gquotino ||
518 ino == sbp->sb_pquotino);
519}
520
521#define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
522#define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
523#define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
524
525#define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
526#define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
527 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
528#define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
529 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
530
531/*
532 * File system sector to basic block conversions.
533 */
534#define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
535
536/*
537 * File system block to basic block conversions.
538 */
539#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
540#define XFS_BB_TO_FSB(mp,bb) \
541 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
542#define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
543
544/*
545 * File system block to byte conversions.
546 */
547#define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
548#define XFS_B_TO_FSB(mp,b) \
549 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
550#define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
551#define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
552
4fb6e8ad
CH		 553/*
554 * Allocation group header
555 *
556 * This is divided into three structures, placed in sequential 512-byte
557 * buffers after a copy of the superblock (also in a 512-byte buffer).
558 */
559#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
560#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
561#define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
562#define XFS_AGF_VERSION 1
563#define XFS_AGI_VERSION 1
564
565#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
566#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
567
568/*
569 * Btree number 0 is bno, 1 is cnt. This value gives the size of the
570 * arrays below.
571 */
572#define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)
573
574/*
575 * The second word of agf_levels in the first a.g. overlaps the EFS
576 * superblock's magic number. Since the magic numbers valid for EFS
577 * are > 64k, our value cannot be confused for an EFS superblock's.
578 */
579
580typedef struct xfs_agf {
581 /*
582 * Common allocation group header information
583 */
584 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
585 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
586 __be32 agf_seqno; /* sequence # starting from 0 */
587 __be32 agf_length; /* size in blocks of a.g. */
588 /*
589 * Freespace information
590 */
591 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
592 __be32 agf_spare0; /* spare field */
593 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
594 __be32 agf_spare1; /* spare field */
595
596 __be32 agf_flfirst; /* first freelist block's index */
597 __be32 agf_fllast; /* last freelist block's index */
598 __be32 agf_flcount; /* count of blocks in freelist */
599 __be32 agf_freeblks; /* total free blocks */
600
601 __be32 agf_longest; /* longest free space */
602 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
603 uuid_t agf_uuid; /* uuid of filesystem */
604
605 /*
606 * reserve some contiguous space for future logged fields before we add
607 * the unlogged fields. This makes the range logging via flags and
608 * structure offsets much simpler.
609 */
610 __be64 agf_spare64[16];
611
612 /* unlogged fields, written during buffer writeback. */
613 __be64 agf_lsn; /* last write sequence */
614 __be32 agf_crc; /* crc of agf sector */
615 __be32 agf_spare2;
616
617 /* structure must be padded to 64 bit alignment */
618} xfs_agf_t;
619
620#define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
621
622#define XFS_AGF_MAGICNUM 0x00000001
623#define XFS_AGF_VERSIONNUM 0x00000002
624#define XFS_AGF_SEQNO 0x00000004
625#define XFS_AGF_LENGTH 0x00000008
626#define XFS_AGF_ROOTS 0x00000010
627#define XFS_AGF_LEVELS 0x00000020
628#define XFS_AGF_FLFIRST 0x00000040
629#define XFS_AGF_FLLAST 0x00000080
630#define XFS_AGF_FLCOUNT 0x00000100
631#define XFS_AGF_FREEBLKS 0x00000200
632#define XFS_AGF_LONGEST 0x00000400
633#define XFS_AGF_BTREEBLKS 0x00000800
634#define XFS_AGF_UUID 0x00001000
635#define XFS_AGF_NUM_BITS 13
636#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
637
638#define XFS_AGF_FLAGS \
639 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
640 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
641 { XFS_AGF_SEQNO, "SEQNO" }, \
642 { XFS_AGF_LENGTH, "LENGTH" }, \
643 { XFS_AGF_ROOTS, "ROOTS" }, \
644 { XFS_AGF_LEVELS, "LEVELS" }, \
645 { XFS_AGF_FLFIRST, "FLFIRST" }, \
646 { XFS_AGF_FLLAST, "FLLAST" }, \
647 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
648 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
649 { XFS_AGF_LONGEST, "LONGEST" }, \
650 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
651 { XFS_AGF_UUID, "UUID" }
652
653/* disk block (xfs_daddr_t) in the AG */
654#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
655#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
656#define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
657
658/*
659 * Size of the unlinked inode hash table in the agi.
660 */
661#define XFS_AGI_UNLINKED_BUCKETS 64
662
663typedef struct xfs_agi {
664 /*
665 * Common allocation group header information
666 */
667 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
668 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
669 __be32 agi_seqno; /* sequence # starting from 0 */
670 __be32 agi_length; /* size in blocks of a.g. */
671 /*
672 * Inode information
673 * Inodes are mapped by interpreting the inode number, so no
674 * mapping data is needed here.
675 */
676 __be32 agi_count; /* count of allocated inodes */
677 __be32 agi_root; /* root of inode btree */
678 __be32 agi_level; /* levels in inode btree */
679 __be32 agi_freecount; /* number of free inodes */
680
681 __be32 agi_newino; /* new inode just allocated */
682 __be32 agi_dirino; /* last directory inode chunk */
683 /*
684 * Hash table of inodes which have been unlinked but are
685 * still being referenced.
686 */
687 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
688 /*
689 * This marks the end of logging region 1 and start of logging region 2.
690 */
691 uuid_t agi_uuid; /* uuid of filesystem */
692 __be32 agi_crc; /* crc of agi sector */
693 __be32 agi_pad32;
694 __be64 agi_lsn; /* last write sequence */
695
696 __be32 agi_free_root; /* root of the free inode btree */
697 __be32 agi_free_level;/* levels in free inode btree */
698
699 /* structure must be padded to 64 bit alignment */
700} xfs_agi_t;
701
702#define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
703
704#define XFS_AGI_MAGICNUM (1 << 0)
705#define XFS_AGI_VERSIONNUM (1 << 1)
706#define XFS_AGI_SEQNO (1 << 2)
707#define XFS_AGI_LENGTH (1 << 3)
708#define XFS_AGI_COUNT (1 << 4)
709#define XFS_AGI_ROOT (1 << 5)
710#define XFS_AGI_LEVEL (1 << 6)
711#define XFS_AGI_FREECOUNT (1 << 7)
712#define XFS_AGI_NEWINO (1 << 8)
713#define XFS_AGI_DIRINO (1 << 9)
714#define XFS_AGI_UNLINKED (1 << 10)
715#define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
716#define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
717#define XFS_AGI_FREE_ROOT (1 << 11)
718#define XFS_AGI_FREE_LEVEL (1 << 12)
719#define XFS_AGI_NUM_BITS_R2 13
720
721/* disk block (xfs_daddr_t) in the AG */
722#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
723#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
724#define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
725
726/*
727 * The third a.g. block contains the a.g. freelist, an array
728 * of block pointers to blocks owned by the allocation btree code.
729 */
730#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
731#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
732#define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
733
734#define XFS_BUF_TO_AGFL_BNO(mp, bp) \
735 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
736 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
737 (__be32 *)(bp)->b_addr)
738
739/*
740 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of
741 * slots in the beginning of the block for a proper header with the
742 * location information and CRC.
743 */
744#define XFS_AGFL_SIZE(mp) \
745 (((mp)->m_sb.sb_sectsize - \
746 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
747 sizeof(struct xfs_agfl) : 0)) / \
748 sizeof(xfs_agblock_t))
749
750typedef struct xfs_agfl {
751 __be32 agfl_magicnum;
752 __be32 agfl_seqno;
753 uuid_t agfl_uuid;
754 __be64 agfl_lsn;
755 __be32 agfl_crc;
756 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */
757} xfs_agfl_t;
758
759#define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
760
761
762#define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels)
763#define XFS_MIN_FREELIST_RAW(bl,cl,mp) \
764 (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
765#define XFS_MIN_FREELIST(a,mp) \
766 (XFS_MIN_FREELIST_RAW( \
767 be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \
768 be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
769#define XFS_MIN_FREELIST_PAG(pag,mp) \
770 (XFS_MIN_FREELIST_RAW( \
771 (unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
772 (unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
773
774#define XFS_AGB_TO_FSB(mp,agno,agbno) \
775 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
776#define XFS_FSB_TO_AGNO(mp,fsbno) \
777 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
778#define XFS_FSB_TO_AGBNO(mp,fsbno) \
779 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
780#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
781 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
782 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
783#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
784
785/*
786 * For checking for bad ranges of xfs_daddr_t's, covering multiple
787 * allocation groups or a single xfs_daddr_t that's a superblock copy.
788 */
789#define XFS_AG_CHECK_DADDR(mp,d,len) \
790 ((len) == 1 ? \
791 ASSERT((d) == XFS_SB_DADDR || \
792 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
793 ASSERT(xfs_daddr_to_agno(mp, d) == \
794 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
795
6d3ebaae
CH		 796typedef struct xfs_timestamp {
797 __be32 t_sec; /* timestamp seconds */
798 __be32 t_nsec; /* timestamp nanoseconds */
799} xfs_timestamp_t;
800
801/*
802 * On-disk inode structure.
803 *
804 * This is just the header or "dinode core", the inode is expanded to fill a
805 * variable size the leftover area split into a data and an attribute fork.
806 * The format of the data and attribute fork depends on the format of the
807 * inode as indicated by di_format and di_aformat. To access the data and
808 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
809 * below.
810 *
811 * There is a very similar struct icdinode in xfs_inode which matches the
812 * layout of the first 96 bytes of this structure, but is kept in native
813 * format instead of big endian.
814 *
815 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
816 * padding field for v3 inodes.
817 */
818#define XFS_DINODE_MAGIC 0x494e /* 'IN' */
819#define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3)
820typedef struct xfs_dinode {
821 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
822 __be16 di_mode; /* mode and type of file */
823 __u8 di_version; /* inode version */
824 __u8 di_format; /* format of di_c data */
825 __be16 di_onlink; /* old number of links to file */
826 __be32 di_uid; /* owner's user id */
827 __be32 di_gid; /* owner's group id */
828 __be32 di_nlink; /* number of links to file */
829 __be16 di_projid_lo; /* lower part of owner's project id */
830 __be16 di_projid_hi; /* higher part owner's project id */
831 __u8 di_pad[6]; /* unused, zeroed space */
832 __be16 di_flushiter; /* incremented on flush */
833 xfs_timestamp_t di_atime; /* time last accessed */
834 xfs_timestamp_t di_mtime; /* time last modified */
835 xfs_timestamp_t di_ctime; /* time created/inode modified */
836 __be64 di_size; /* number of bytes in file */
837 __be64 di_nblocks; /* # of direct & btree blocks used */
838 __be32 di_extsize; /* basic/minimum extent size for file */
839 __be32 di_nextents; /* number of extents in data fork */
840 __be16 di_anextents; /* number of extents in attribute fork*/
841 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
842 __s8 di_aformat; /* format of attr fork's data */
843 __be32 di_dmevmask; /* DMIG event mask */
844 __be16 di_dmstate; /* DMIG state info */
845 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
846 __be32 di_gen; /* generation number */
847
848 /* di_next_unlinked is the only non-core field in the old dinode */
849 __be32 di_next_unlinked;/* agi unlinked list ptr */
850
851 /* start of the extended dinode, writable fields */
852 __le32 di_crc; /* CRC of the inode */
853 __be64 di_changecount; /* number of attribute changes */
854 __be64 di_lsn; /* flush sequence */
855 __be64 di_flags2; /* more random flags */
856 __u8 di_pad2[16]; /* more padding for future expansion */
857
858 /* fields only written to during inode creation */
859 xfs_timestamp_t di_crtime; /* time created */
860 __be64 di_ino; /* inode number */
861 uuid_t di_uuid; /* UUID of the filesystem */
862
863 /* structure must be padded to 64 bit alignment */
864} xfs_dinode_t;
865
866#define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
867
868#define DI_MAX_FLUSH 0xffff
869
870/*
871 * Size of the core inode on disk. Version 1 and 2 inodes have
872 * the same size, but version 3 has grown a few additional fields.
873 */
874static inline uint xfs_dinode_size(int version)
875{
876 if (version == 3)
877 return sizeof(struct xfs_dinode);
878 return offsetof(struct xfs_dinode, di_crc);
879}
880
881/*
882 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
883 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
884 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
885 */
886#define XFS_MAXLINK ((1U << 31) - 1U)
887#define XFS_MAXLINK_1 65535U
888
889/*
890 * Values for di_format
891 */
892typedef enum xfs_dinode_fmt {
893 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
894 XFS_DINODE_FMT_LOCAL, /* bulk data */
895 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
896 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
897 XFS_DINODE_FMT_UUID /* uuid_t */
898} xfs_dinode_fmt_t;
899
900/*
901 * Inode minimum and maximum sizes.
902 */
903#define XFS_DINODE_MIN_LOG 8
904#define XFS_DINODE_MAX_LOG 11
905#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
906#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
907
908/*
909 * Inode size for given fs.
910 */
911#define XFS_LITINO(mp, version) \
912 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
913
914/*
915 * Inode data & attribute fork sizes, per inode.
916 */
917#define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
918#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
919
920#define XFS_DFORK_DSIZE(dip,mp) \
921 (XFS_DFORK_Q(dip) ? \
922 XFS_DFORK_BOFF(dip) : \
923 XFS_LITINO(mp, (dip)->di_version))
924#define XFS_DFORK_ASIZE(dip,mp) \
925 (XFS_DFORK_Q(dip) ? \
926 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
927 0)
928#define XFS_DFORK_SIZE(dip,mp,w) \
929 ((w) == XFS_DATA_FORK ? \
930 XFS_DFORK_DSIZE(dip, mp) : \
931 XFS_DFORK_ASIZE(dip, mp))
932
933/*
934 * Return pointers to the data or attribute forks.
935 */
936#define XFS_DFORK_DPTR(dip) \
937 ((char *)dip + xfs_dinode_size(dip->di_version))
938#define XFS_DFORK_APTR(dip) \
939 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
940#define XFS_DFORK_PTR(dip,w) \
941 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
942
943#define XFS_DFORK_FORMAT(dip,w) \
944 ((w) == XFS_DATA_FORK ? \
945 (dip)->di_format : \
946 (dip)->di_aformat)
947#define XFS_DFORK_NEXTENTS(dip,w) \
948 ((w) == XFS_DATA_FORK ? \
949 be32_to_cpu((dip)->di_nextents) : \
950 be16_to_cpu((dip)->di_anextents))
951
952/*
953 * For block and character special files the 32bit dev_t is stored at the
954 * beginning of the data fork.
955 */
956static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
957{
958 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
959}
960
961static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
962{
963 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
964}
965
966/*
967 * Values for di_flags
968 * There should be a one-to-one correspondence between these flags and the
969 * XFS_XFLAG_s.
970 */
971#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
972#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
973#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
974#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
975#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
976#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
977#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
978#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
979#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
980#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
981#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
982#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
983#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
984#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
985#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
986#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
987#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
988#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
989#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
990#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
991#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
992#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
993#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
994#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
995#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
996#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
997#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
998#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
999#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1000#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1001
1002#define XFS_DIFLAG_ANY \
1003 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1004 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1005 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1006 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1007 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1008
508b6b3b
CH		 1009/*
1010 * Inode number format:
1011 * low inopblog bits - offset in block
1012 * next agblklog bits - block number in ag
1013 * next agno_log bits - ag number
1014 * high agno_log-agblklog-inopblog bits - 0
1015 */
1016#define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1)
1017#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1018#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1019#define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
1020#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1021#define XFS_INO_BITS(mp) \
1022 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1023#define XFS_INO_TO_AGNO(mp,i) \
1024 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1025#define XFS_INO_TO_AGINO(mp,i) \
1026 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1027#define XFS_INO_TO_AGBNO(mp,i) \
1028 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1029 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1030#define XFS_INO_TO_OFFSET(mp,i) \
1031 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1032#define XFS_INO_TO_FSB(mp,i) \
1033 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1034#define XFS_AGINO_TO_INO(mp,a,i) \
1035 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1036#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1037#define XFS_AGINO_TO_OFFSET(mp,i) \
1038 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1039#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1040 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1041
1042#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1043#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
6d3ebaae 1044
c7298202
DC		 1045/*
1046 * RealTime Device format definitions
1047 */
1048
1049/* Min and max rt extent sizes, specified in bytes */
1050#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1051#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1052#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1053
1054#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1055#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1056#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
1057#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
1058
1059/*
1060 * RT Summary and bit manipulation macros.
1061 */
1062#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1063#define XFS_SUMOFFSTOBLOCK(mp,s) \
1064 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1065#define XFS_SUMPTR(mp,bp,so) \
1066 ((xfs_suminfo_t *)((bp)->b_addr + \
1067 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1068
1069#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
1070#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
1071#define XFS_BITTOWORD(mp,bi) \
1072 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1073
1074#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1075#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1076
1077#define XFS_RTLOBIT(w) xfs_lowbit32(w)
1078#define XFS_RTHIBIT(w) xfs_highbit32(w)
1079
c7298202 1080#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
c7298202 1081
6ca1c906
DC		 1082/*
1083 * Dquot and dquot block format definitions
1084 */
1085#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1086#define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */
1087
1088/*
1089 * This is the main portion of the on-disk representation of quota
1090 * information for a user. This is the q_core of the xfs_dquot_t that
1091 * is kept in kernel memory. We pad this with some more expansion room
1092 * to construct the on disk structure.
1093 */
1094typedef struct xfs_disk_dquot {
1095 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1096 __u8 d_version; /* dquot version */
1097 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
1098 __be32 d_id; /* user,project,group id */
1099 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1100 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1101 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1102 __be64 d_ino_softlimit;/* preferred inode limit */
1103 __be64 d_bcount; /* disk blocks owned by the user */
1104 __be64 d_icount; /* inodes owned by the user */
1105 __be32 d_itimer; /* zero if within inode limits if not,
1106 this is when we refuse service */
1107 __be32 d_btimer; /* similar to above; for disk blocks */
1108 __be16 d_iwarns; /* warnings issued wrt num inodes */
1109 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1110 __be32 d_pad0; /* 64 bit align */
1111 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1112 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1113 __be64 d_rtbcount; /* realtime blocks owned */
1114 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1115 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1116 __be16 d_pad;
1117} xfs_disk_dquot_t;
1118
1119/*
1120 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1121 * carrying the unnecessary padding would be a waste of memory.
1122 */
1123typedef struct xfs_dqblk {
1124 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */
1125 char dd_fill[4]; /* filling for posterity */
1126
1127 /*
1128 * These two are only present on filesystems with the CRC bits set.
1129 */
1130 __be32 dd_crc; /* checksum */
1131 __be64 dd_lsn; /* last modification in log */
1132 uuid_t dd_uuid; /* location information */
1133} xfs_dqblk_t;
1134
1135#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1136
1fb7e48d
DC		 1137/*
1138 * Remote symlink format and access functions.
1139 */
1140#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1141
1142struct xfs_dsymlink_hdr {
1143 __be32 sl_magic;
1144 __be32 sl_offset;
1145 __be32 sl_bytes;
1146 __be32 sl_crc;
1147 uuid_t sl_uuid;
1148 __be64 sl_owner;
1149 __be64 sl_blkno;
1150 __be64 sl_lsn;
1151};
1152
533b81c8
ES		 1153#define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1154
1fb7e48d
DC		 1155/*
1156 * The maximum pathlen is 1024 bytes. Since the minimum file system
1157 * blocksize is 512 bytes, we can get a max of 3 extents back from
1158 * bmapi when crc headers are taken into account.
1159 */
1160#define XFS_SYMLINK_MAPS 3
1161
1162#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1163 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1164 sizeof(struct xfs_dsymlink_hdr) : 0))
1165
a4fbe6ab
DC		 1166
1167/*
1168 * Allocation Btree format definitions
1169 *
1170 * There are two on-disk btrees, one sorted by blockno and one sorted
1171 * by blockcount and blockno. All blocks look the same to make the code
1172 * simpler; if we have time later, we'll make the optimizations.
1173 */
1174#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1175#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1176#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1177#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1178
1179/*
1180 * Data record/key structure
1181 */
1182typedef struct xfs_alloc_rec {
1183 __be32 ar_startblock; /* starting block number */
1184 __be32 ar_blockcount; /* count of free blocks */
1185} xfs_alloc_rec_t, xfs_alloc_key_t;
1186
1187typedef struct xfs_alloc_rec_incore {
1188 xfs_agblock_t ar_startblock; /* starting block number */
1189 xfs_extlen_t ar_blockcount; /* count of free blocks */
1190} xfs_alloc_rec_incore_t;
1191
1192/* btree pointer type */
1193typedef __be32 xfs_alloc_ptr_t;
1194
1195/*
1196 * Block numbers in the AG:
1197 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1198 */
1199#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1200#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1201
1202
1203/*
1204 * Inode Allocation Btree format definitions
1205 *
1206 * There is a btree for the inode map per allocation group.
1207 */
1208#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1209#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
aafc3c24
BF		 1210#define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1211#define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
a4fbe6ab
DC		 1212
1213typedef __uint64_t xfs_inofree_t;
1214#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1215#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1216#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1217#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1218
1219static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1220{
1221 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1222}
1223
1224/*
1225 * Data record structure
1226 */
1227typedef struct xfs_inobt_rec {
1228 __be32 ir_startino; /* starting inode number */
1229 __be32 ir_freecount; /* count of free inodes (set bits) */
1230 __be64 ir_free; /* free inode mask */
1231} xfs_inobt_rec_t;
1232
1233typedef struct xfs_inobt_rec_incore {
1234 xfs_agino_t ir_startino; /* starting inode number */
1235 __int32_t ir_freecount; /* count of free inodes (set bits) */
1236 xfs_inofree_t ir_free; /* free inode mask */
1237} xfs_inobt_rec_incore_t;
1238
1239
1240/*
1241 * Key structure
1242 */
1243typedef struct xfs_inobt_key {
1244 __be32 ir_startino; /* starting inode number */
1245} xfs_inobt_key_t;
1246
1247/* btree pointer type */
1248typedef __be32 xfs_inobt_ptr_t;
1249
1250/*
1251 * block numbers in the AG.
1252 */
1253#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
aafc3c24
BF		 1254#define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1255
1256/*
1257 * The first data block of an AG depends on whether the filesystem was formatted
1258 * with the finobt feature. If so, account for the finobt reserved root btree
1259 * block.
1260 */
1261#define XFS_PREALLOC_BLOCKS(mp) \
1262 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1263 XFS_FIBT_BLOCK(mp) + 1 : \
1264 XFS_IBT_BLOCK(mp) + 1)
a4fbe6ab
DC		 1265
1266
1267
1268/*
1269 * BMAP Btree format definitions
1270 *
1271 * This includes both the root block definition that sits inside an inode fork
1272 * and the record/pointer formats for the leaf/node in the blocks.
1273 */
1274#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1275#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1276
1277/*
1278 * Bmap root header, on-disk form only.
1279 */
1280typedef struct xfs_bmdr_block {
1281 __be16 bb_level; /* 0 is a leaf */
1282 __be16 bb_numrecs; /* current # of data records */
1283} xfs_bmdr_block_t;
1284
1285/*
1286 * Bmap btree record and extent descriptor.
1287 * l0:63 is an extent flag (value 1 indicates non-normal).
1288 * l0:9-62 are startoff.
1289 * l0:0-8 and l1:21-63 are startblock.
1290 * l1:0-20 are blockcount.
1291 */
1292#define BMBT_EXNTFLAG_BITLEN 1
1293#define BMBT_STARTOFF_BITLEN 54
1294#define BMBT_STARTBLOCK_BITLEN 52
1295#define BMBT_BLOCKCOUNT_BITLEN 21
1296
1297typedef struct xfs_bmbt_rec {
1298 __be64 l0, l1;
1299} xfs_bmbt_rec_t;
1300
1301typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1302typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1303
1304typedef struct xfs_bmbt_rec_host {
1305 __uint64_t l0, l1;
1306} xfs_bmbt_rec_host_t;
1307
1308/*
1309 * Values and macros for delayed-allocation startblock fields.
1310 */
1311#define STARTBLOCKVALBITS 17
d5cf09ba 1312#define STARTBLOCKMASKBITS (15 + 20)
a4fbe6ab
DC		 1313#define STARTBLOCKMASK \
1314 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
a4fbe6ab
DC		 1315
1316static inline int isnullstartblock(xfs_fsblock_t x)
1317{
1318 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1319}
1320
a4fbe6ab
DC		 1321static inline xfs_fsblock_t nullstartblock(int k)
1322{
1323 ASSERT(k < (1 << STARTBLOCKVALBITS));
1324 return STARTBLOCKMASK | (k);
1325}
1326
1327static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1328{
1329 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1330}
1331
1332/*
1333 * Possible extent formats.
1334 */
1335typedef enum {
1336 XFS_EXTFMT_NOSTATE = 0,
1337 XFS_EXTFMT_HASSTATE
1338} xfs_exntfmt_t;
1339
1340/*
1341 * Possible extent states.
1342 */
1343typedef enum {
1344 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
1345 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
1346} xfs_exntst_t;
1347
1348/*
1349 * Incore version of above.
1350 */
1351typedef struct xfs_bmbt_irec
1352{
1353 xfs_fileoff_t br_startoff; /* starting file offset */
1354 xfs_fsblock_t br_startblock; /* starting block number */
1355 xfs_filblks_t br_blockcount; /* number of blocks */
1356 xfs_exntst_t br_state; /* extent state */
1357} xfs_bmbt_irec_t;
1358
1359/*
1360 * Key structure for non-leaf levels of the tree.
1361 */
1362typedef struct xfs_bmbt_key {
1363 __be64 br_startoff; /* starting file offset */
1364} xfs_bmbt_key_t, xfs_bmdr_key_t;
1365
1366/* btree pointer type */
1367typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1368
1369
1370/*
1371 * Generic Btree block format definitions
1372 *
1373 * This is a combination of the actual format used on disk for short and long
1374 * format btrees. The first three fields are shared by both format, but the
1375 * pointers are different and should be used with care.
1376 *
1377 * To get the size of the actual short or long form headers please use the size
1378 * macros below. Never use sizeof(xfs_btree_block).
1379 *
1380 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1381 * with the crc feature bit, and all accesses to them must be conditional on
1382 * that flag.
1383 */
1384struct xfs_btree_block {
1385 __be32 bb_magic; /* magic number for block type */
1386 __be16 bb_level; /* 0 is a leaf */
1387 __be16 bb_numrecs; /* current # of data records */
1388 union {
1389 struct {
1390 __be32 bb_leftsib;
1391 __be32 bb_rightsib;
1392
1393 __be64 bb_blkno;
1394 __be64 bb_lsn;
1395 uuid_t bb_uuid;
1396 __be32 bb_owner;
1397 __le32 bb_crc;
1398 } s; /* short form pointers */
1399 struct {
1400 __be64 bb_leftsib;
1401 __be64 bb_rightsib;
1402
1403 __be64 bb_blkno;
1404 __be64 bb_lsn;
1405 uuid_t bb_uuid;
1406 __be64 bb_owner;
1407 __le32 bb_crc;
1408 __be32 bb_pad; /* padding for alignment */
1409 } l; /* long form pointers */
1410 } bb_u; /* rest */
1411};
1412
1413#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
1414#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
1415
1416/* sizes of CRC enabled btree blocks */
1417#define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40)
1418#define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48)
1419
1420#define XFS_BTREE_SBLOCK_CRC_OFF \
1421 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1422#define XFS_BTREE_LBLOCK_CRC_OFF \
1423 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1424
5beda58b
CH		 1425/*
1426 * On-disk XFS access control list structure.
1427 */
1428struct xfs_acl_entry {
1429 __be32 ae_tag;
1430 __be32 ae_id;
1431 __be16 ae_perm;
1432 __be16 ae_pad; /* fill the implicit hole in the structure */
1433};
1434
1435struct xfs_acl {
1436 __be32 acl_cnt;
1437 struct xfs_acl_entry acl_entry[0];
1438};
1439
1440/*
1441 * The number of ACL entries allowed is defined by the on-disk format.
1442 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1443 * limited only by the maximum size of the xattr that stores the information.
1444 */
1445#define XFS_ACL_MAX_ENTRIES(mp) \
1446 (xfs_sb_version_hascrc(&mp->m_sb) \
1447 ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1448 sizeof(struct xfs_acl_entry) \
1449 : 25)
1450
1451#define XFS_ACL_MAX_SIZE(mp) \
1452 (sizeof(struct xfs_acl) + \
1453 sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
1454
1455/* On-disk XFS extended attribute names */
1456#define SGI_ACL_FILE (unsigned char *)"SGI_ACL_FILE"
1457#define SGI_ACL_DEFAULT (unsigned char *)"SGI_ACL_DEFAULT"
1458#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1459#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1460
6ca1c906 1461#endif /* __XFS_FORMAT_H__ */
Linux kernel - Deliverables
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