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
30 struct xfs_mount;
31 struct xfs_trans;
32 struct xfs_inode;
33 struct xfs_buf;
34 struct xfs_ifork;
35
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 * The size of a single extended attribute on disk is limited by
64 * the size of index values within the attribute entries themselves.
65 * These are be16 fields, so we can only support attribute data
66 * sizes up to 2^16 bytes in length.
67 */
68 #define XFS_XATTR_SIZE_MAX (1 << 16)
69
70 /*
71 * Supported feature bit list is just all bits in the versionnum field because
72 * we've used them all up and understand them all. Except, of course, for the
73 * shared superblock bit, which nobody knows what it does and so is unsupported.
74 */
75 #define XFS_SB_VERSION_OKBITS \
76 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
77 ~XFS_SB_VERSION_SHAREDBIT)
78
79 /*
80 * There are two words to hold XFS "feature" bits: the original
81 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
82 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
83 *
84 * These defines represent bits in sb_features2.
85 */
86 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
87 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
88 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
89 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
90 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
91 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
92 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
93 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
94
95 #define XFS_SB_VERSION2_OKBITS \
96 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
97 XFS_SB_VERSION2_ATTR2BIT | \
98 XFS_SB_VERSION2_PROJID32BIT | \
99 XFS_SB_VERSION2_FTYPE)
100
101 /*
102 * Superblock - in core version. Must match the ondisk version below.
103 * Must be padded to 64 bit alignment.
104 */
105 typedef struct xfs_sb {
106 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
107 __uint32_t sb_blocksize; /* logical block size, bytes */
108 xfs_rfsblock_t sb_dblocks; /* number of data blocks */
109 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
110 xfs_rtblock_t sb_rextents; /* number of realtime extents */
111 uuid_t sb_uuid; /* user-visible file system unique id */
112 xfs_fsblock_t sb_logstart; /* starting block of log if internal */
113 xfs_ino_t sb_rootino; /* root inode number */
114 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
115 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
116 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
117 xfs_agblock_t sb_agblocks; /* size of an allocation group */
118 xfs_agnumber_t sb_agcount; /* number of allocation groups */
119 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
120 xfs_extlen_t sb_logblocks; /* number of log blocks */
121 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
122 __uint16_t sb_sectsize; /* volume sector size, bytes */
123 __uint16_t sb_inodesize; /* inode size, bytes */
124 __uint16_t sb_inopblock; /* inodes per block */
125 char sb_fname[12]; /* file system name */
126 __uint8_t sb_blocklog; /* log2 of sb_blocksize */
127 __uint8_t sb_sectlog; /* log2 of sb_sectsize */
128 __uint8_t sb_inodelog; /* log2 of sb_inodesize */
129 __uint8_t sb_inopblog; /* log2 of sb_inopblock */
130 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
131 __uint8_t sb_rextslog; /* log2 of sb_rextents */
132 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
133 __uint8_t sb_imax_pct; /* max % of fs for inode space */
134 /* statistics */
135 /*
136 * These fields must remain contiguous. If you really
137 * want to change their layout, make sure you fix the
138 * code in xfs_trans_apply_sb_deltas().
139 */
140 __uint64_t sb_icount; /* allocated inodes */
141 __uint64_t sb_ifree; /* free inodes */
142 __uint64_t sb_fdblocks; /* free data blocks */
143 __uint64_t sb_frextents; /* free realtime extents */
144 /*
145 * End contiguous fields.
146 */
147 xfs_ino_t sb_uquotino; /* user quota inode */
148 xfs_ino_t sb_gquotino; /* group quota inode */
149 __uint16_t sb_qflags; /* quota flags */
150 __uint8_t sb_flags; /* misc. flags */
151 __uint8_t sb_shared_vn; /* shared version number */
152 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
153 __uint32_t sb_unit; /* stripe or raid unit */
154 __uint32_t sb_width; /* stripe or raid width */
155 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
156 __uint8_t sb_logsectlog; /* log2 of the log sector size */
157 __uint16_t sb_logsectsize; /* sector size for the log, bytes */
158 __uint32_t sb_logsunit; /* stripe unit size for the log */
159 __uint32_t sb_features2; /* additional feature bits */
160
161 /*
162 * bad features2 field as a result of failing to pad the sb structure to
163 * 64 bits. Some machines will be using this field for features2 bits.
164 * Easiest just to mark it bad and not use it for anything else.
165 *
166 * This is not kept up to date in memory; it is always overwritten by
167 * the value in sb_features2 when formatting the incore superblock to
168 * the disk buffer.
169 */
170 __uint32_t sb_bad_features2;
171
172 /* version 5 superblock fields start here */
173
174 /* feature masks */
175 __uint32_t sb_features_compat;
176 __uint32_t sb_features_ro_compat;
177 __uint32_t sb_features_incompat;
178 __uint32_t sb_features_log_incompat;
179
180 __uint32_t sb_crc; /* superblock crc */
181 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
182
183 xfs_ino_t sb_pquotino; /* project quota inode */
184 xfs_lsn_t sb_lsn; /* last write sequence */
185 uuid_t sb_meta_uuid; /* metadata file system unique id */
186
187 /* must be padded to 64 bit alignment */
188 } xfs_sb_t;
189
190 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
191
192 /*
193 * Superblock - on disk version. Must match the in core version above.
194 * Must be padded to 64 bit alignment.
195 */
196 typedef struct xfs_dsb {
197 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
198 __be32 sb_blocksize; /* logical block size, bytes */
199 __be64 sb_dblocks; /* number of data blocks */
200 __be64 sb_rblocks; /* number of realtime blocks */
201 __be64 sb_rextents; /* number of realtime extents */
202 uuid_t sb_uuid; /* user-visible file system unique id */
203 __be64 sb_logstart; /* starting block of log if internal */
204 __be64 sb_rootino; /* root inode number */
205 __be64 sb_rbmino; /* bitmap inode for realtime extents */
206 __be64 sb_rsumino; /* summary inode for rt bitmap */
207 __be32 sb_rextsize; /* realtime extent size, blocks */
208 __be32 sb_agblocks; /* size of an allocation group */
209 __be32 sb_agcount; /* number of allocation groups */
210 __be32 sb_rbmblocks; /* number of rt bitmap blocks */
211 __be32 sb_logblocks; /* number of log blocks */
212 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */
213 __be16 sb_sectsize; /* volume sector size, bytes */
214 __be16 sb_inodesize; /* inode size, bytes */
215 __be16 sb_inopblock; /* inodes per block */
216 char sb_fname[12]; /* file system name */
217 __u8 sb_blocklog; /* log2 of sb_blocksize */
218 __u8 sb_sectlog; /* log2 of sb_sectsize */
219 __u8 sb_inodelog; /* log2 of sb_inodesize */
220 __u8 sb_inopblog; /* log2 of sb_inopblock */
221 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
222 __u8 sb_rextslog; /* log2 of sb_rextents */
223 __u8 sb_inprogress; /* mkfs is in progress, don't mount */
224 __u8 sb_imax_pct; /* max % of fs for inode space */
225 /* statistics */
226 /*
227 * These fields must remain contiguous. If you really
228 * want to change their layout, make sure you fix the
229 * code in xfs_trans_apply_sb_deltas().
230 */
231 __be64 sb_icount; /* allocated inodes */
232 __be64 sb_ifree; /* free inodes */
233 __be64 sb_fdblocks; /* free data blocks */
234 __be64 sb_frextents; /* free realtime extents */
235 /*
236 * End contiguous fields.
237 */
238 __be64 sb_uquotino; /* user quota inode */
239 __be64 sb_gquotino; /* group quota inode */
240 __be16 sb_qflags; /* quota flags */
241 __u8 sb_flags; /* misc. flags */
242 __u8 sb_shared_vn; /* shared version number */
243 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
244 __be32 sb_unit; /* stripe or raid unit */
245 __be32 sb_width; /* stripe or raid width */
246 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
247 __u8 sb_logsectlog; /* log2 of the log sector size */
248 __be16 sb_logsectsize; /* sector size for the log, bytes */
249 __be32 sb_logsunit; /* stripe unit size for the log */
250 __be32 sb_features2; /* additional feature bits */
251 /*
252 * bad features2 field as a result of failing to pad the sb
253 * structure to 64 bits. Some machines will be using this field
254 * for features2 bits. Easiest just to mark it bad and not use
255 * it for anything else.
256 */
257 __be32 sb_bad_features2;
258
259 /* version 5 superblock fields start here */
260
261 /* feature masks */
262 __be32 sb_features_compat;
263 __be32 sb_features_ro_compat;
264 __be32 sb_features_incompat;
265 __be32 sb_features_log_incompat;
266
267 __le32 sb_crc; /* superblock crc */
268 __be32 sb_spino_align; /* sparse inode chunk alignment */
269
270 __be64 sb_pquotino; /* project quota inode */
271 __be64 sb_lsn; /* last write sequence */
272 uuid_t sb_meta_uuid; /* metadata file system unique id */
273
274 /* must be padded to 64 bit alignment */
275 } xfs_dsb_t;
276
277
278 /*
279 * Misc. Flags - warning - these will be cleared by xfs_repair unless
280 * a feature bit is set when the flag is used.
281 */
282 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
283 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
284
285 /*
286 * define max. shared version we can interoperate with
287 */
288 #define XFS_SB_MAX_SHARED_VN 0
289
290 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
291
292 /*
293 * The first XFS version we support is a v4 superblock with V2 directories.
294 */
xfs_sb_good_v4_features(struct xfs_sb * sbp)295 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
296 {
297 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
298 return false;
299
300 /* check for unknown features in the fs */
301 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
302 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
303 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
304 return false;
305
306 return true;
307 }
308
xfs_sb_good_version(struct xfs_sb * sbp)309 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
310 {
311 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
312 return true;
313 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
314 return xfs_sb_good_v4_features(sbp);
315 return false;
316 }
317
318 /*
319 * Detect a mismatched features2 field. Older kernels read/wrote
320 * this into the wrong slot, so to be safe we keep them in sync.
321 */
xfs_sb_has_mismatched_features2(struct xfs_sb * sbp)322 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
323 {
324 return sbp->sb_bad_features2 != sbp->sb_features2;
325 }
326
xfs_sb_version_hasattr(struct xfs_sb * sbp)327 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
328 {
329 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
330 }
331
xfs_sb_version_addattr(struct xfs_sb * sbp)332 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
333 {
334 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
335 }
336
xfs_sb_version_hasquota(struct xfs_sb * sbp)337 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
338 {
339 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
340 }
341
xfs_sb_version_addquota(struct xfs_sb * sbp)342 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
343 {
344 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
345 }
346
xfs_sb_version_hasalign(struct xfs_sb * sbp)347 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
348 {
349 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
350 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
351 }
352
xfs_sb_version_hasdalign(struct xfs_sb * sbp)353 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
354 {
355 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
356 }
357
xfs_sb_version_haslogv2(struct xfs_sb * sbp)358 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
359 {
360 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
361 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
362 }
363
xfs_sb_version_hasextflgbit(struct xfs_sb * sbp)364 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
365 {
366 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
367 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
368 }
369
xfs_sb_version_hassector(struct xfs_sb * sbp)370 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
371 {
372 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
373 }
374
xfs_sb_version_hasasciici(struct xfs_sb * sbp)375 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
376 {
377 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
378 }
379
xfs_sb_version_hasmorebits(struct xfs_sb * sbp)380 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
381 {
382 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
383 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
384 }
385
386 /*
387 * sb_features2 bit version macros.
388 */
xfs_sb_version_haslazysbcount(struct xfs_sb * sbp)389 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
390 {
391 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
392 (xfs_sb_version_hasmorebits(sbp) &&
393 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
394 }
395
xfs_sb_version_hasattr2(struct xfs_sb * sbp)396 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
397 {
398 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
399 (xfs_sb_version_hasmorebits(sbp) &&
400 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
401 }
402
xfs_sb_version_addattr2(struct xfs_sb * sbp)403 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
404 {
405 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
406 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
407 }
408
xfs_sb_version_removeattr2(struct xfs_sb * sbp)409 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
410 {
411 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
412 if (!sbp->sb_features2)
413 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
414 }
415
xfs_sb_version_hasprojid32bit(struct xfs_sb * sbp)416 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
417 {
418 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
419 (xfs_sb_version_hasmorebits(sbp) &&
420 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
421 }
422
xfs_sb_version_addprojid32bit(struct xfs_sb * sbp)423 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
424 {
425 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
426 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
427 }
428
429 /*
430 * Extended v5 superblock feature masks. These are to be used for new v5
431 * superblock features only.
432 *
433 * Compat features are new features that old kernels will not notice or affect
434 * and so can mount read-write without issues.
435 *
436 * RO-Compat (read only) are features that old kernels can read but will break
437 * if they write. Hence only read-only mounts of such filesystems are allowed on
438 * kernels that don't support the feature bit.
439 *
440 * InCompat features are features which old kernels will not understand and so
441 * must not mount.
442 *
443 * Log-InCompat features are for changes to log formats or new transactions that
444 * can't be replayed on older kernels. The fields are set when the filesystem is
445 * mounted, and a clean unmount clears the fields.
446 */
447 #define XFS_SB_FEAT_COMPAT_ALL 0
448 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
449 static inline bool
xfs_sb_has_compat_feature(struct xfs_sb * sbp,__uint32_t feature)450 xfs_sb_has_compat_feature(
451 struct xfs_sb *sbp,
452 __uint32_t feature)
453 {
454 return (sbp->sb_features_compat & feature) != 0;
455 }
456
457 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
458 #define XFS_SB_FEAT_RO_COMPAT_ALL \
459 (XFS_SB_FEAT_RO_COMPAT_FINOBT)
460 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
461 static inline bool
xfs_sb_has_ro_compat_feature(struct xfs_sb * sbp,__uint32_t feature)462 xfs_sb_has_ro_compat_feature(
463 struct xfs_sb *sbp,
464 __uint32_t feature)
465 {
466 return (sbp->sb_features_ro_compat & feature) != 0;
467 }
468
469 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
470 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
471 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
472 #define XFS_SB_FEAT_INCOMPAT_ALL \
473 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
474 XFS_SB_FEAT_INCOMPAT_SPINODES| \
475 XFS_SB_FEAT_INCOMPAT_META_UUID)
476
477 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
478 static inline bool
xfs_sb_has_incompat_feature(struct xfs_sb * sbp,__uint32_t feature)479 xfs_sb_has_incompat_feature(
480 struct xfs_sb *sbp,
481 __uint32_t feature)
482 {
483 return (sbp->sb_features_incompat & feature) != 0;
484 }
485
486 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
487 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
488 static inline bool
xfs_sb_has_incompat_log_feature(struct xfs_sb * sbp,__uint32_t feature)489 xfs_sb_has_incompat_log_feature(
490 struct xfs_sb *sbp,
491 __uint32_t feature)
492 {
493 return (sbp->sb_features_log_incompat & feature) != 0;
494 }
495
496 /*
497 * V5 superblock specific feature checks
498 */
xfs_sb_version_hascrc(struct xfs_sb * sbp)499 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
500 {
501 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
502 }
503
xfs_sb_version_has_pquotino(struct xfs_sb * sbp)504 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
505 {
506 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
507 }
508
xfs_sb_version_hasftype(struct xfs_sb * sbp)509 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
510 {
511 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
512 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
513 (xfs_sb_version_hasmorebits(sbp) &&
514 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
515 }
516
xfs_sb_version_hasfinobt(xfs_sb_t * sbp)517 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
518 {
519 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
520 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
521 }
522
xfs_sb_version_hassparseinodes(struct xfs_sb * sbp)523 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
524 {
525 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
526 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
527 }
528
529 /*
530 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
531 * is stored separately from the user-visible UUID; this allows the
532 * user-visible UUID to be changed on V5 filesystems which have a
533 * filesystem UUID stamped into every piece of metadata.
534 */
xfs_sb_version_hasmetauuid(struct xfs_sb * sbp)535 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
536 {
537 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
538 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
539 }
540
541 /*
542 * end of superblock version macros
543 */
544
545 static inline bool
xfs_is_quota_inode(struct xfs_sb * sbp,xfs_ino_t ino)546 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
547 {
548 return (ino == sbp->sb_uquotino ||
549 ino == sbp->sb_gquotino ||
550 ino == sbp->sb_pquotino);
551 }
552
553 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
554 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
555 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
556
557 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
558 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
559 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
560 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
561 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
562
563 /*
564 * File system sector to basic block conversions.
565 */
566 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
567
568 /*
569 * File system block to basic block conversions.
570 */
571 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
572 #define XFS_BB_TO_FSB(mp,bb) \
573 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
574 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
575
576 /*
577 * File system block to byte conversions.
578 */
579 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
580 #define XFS_B_TO_FSB(mp,b) \
581 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
582 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
583 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
584
585 /*
586 * Allocation group header
587 *
588 * This is divided into three structures, placed in sequential 512-byte
589 * buffers after a copy of the superblock (also in a 512-byte buffer).
590 */
591 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
592 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
593 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
594 #define XFS_AGF_VERSION 1
595 #define XFS_AGI_VERSION 1
596
597 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
598 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
599
600 /*
601 * Btree number 0 is bno, 1 is cnt. This value gives the size of the
602 * arrays below.
603 */
604 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)
605
606 /*
607 * The second word of agf_levels in the first a.g. overlaps the EFS
608 * superblock's magic number. Since the magic numbers valid for EFS
609 * are > 64k, our value cannot be confused for an EFS superblock's.
610 */
611
612 typedef struct xfs_agf {
613 /*
614 * Common allocation group header information
615 */
616 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
617 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
618 __be32 agf_seqno; /* sequence # starting from 0 */
619 __be32 agf_length; /* size in blocks of a.g. */
620 /*
621 * Freespace information
622 */
623 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
624 __be32 agf_spare0; /* spare field */
625 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
626 __be32 agf_spare1; /* spare field */
627
628 __be32 agf_flfirst; /* first freelist block's index */
629 __be32 agf_fllast; /* last freelist block's index */
630 __be32 agf_flcount; /* count of blocks in freelist */
631 __be32 agf_freeblks; /* total free blocks */
632
633 __be32 agf_longest; /* longest free space */
634 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
635 uuid_t agf_uuid; /* uuid of filesystem */
636
637 /*
638 * reserve some contiguous space for future logged fields before we add
639 * the unlogged fields. This makes the range logging via flags and
640 * structure offsets much simpler.
641 */
642 __be64 agf_spare64[16];
643
644 /* unlogged fields, written during buffer writeback. */
645 __be64 agf_lsn; /* last write sequence */
646 __be32 agf_crc; /* crc of agf sector */
647 __be32 agf_spare2;
648
649 /* structure must be padded to 64 bit alignment */
650 } xfs_agf_t;
651
652 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
653
654 #define XFS_AGF_MAGICNUM 0x00000001
655 #define XFS_AGF_VERSIONNUM 0x00000002
656 #define XFS_AGF_SEQNO 0x00000004
657 #define XFS_AGF_LENGTH 0x00000008
658 #define XFS_AGF_ROOTS 0x00000010
659 #define XFS_AGF_LEVELS 0x00000020
660 #define XFS_AGF_FLFIRST 0x00000040
661 #define XFS_AGF_FLLAST 0x00000080
662 #define XFS_AGF_FLCOUNT 0x00000100
663 #define XFS_AGF_FREEBLKS 0x00000200
664 #define XFS_AGF_LONGEST 0x00000400
665 #define XFS_AGF_BTREEBLKS 0x00000800
666 #define XFS_AGF_UUID 0x00001000
667 #define XFS_AGF_NUM_BITS 13
668 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
669
670 #define XFS_AGF_FLAGS \
671 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
672 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
673 { XFS_AGF_SEQNO, "SEQNO" }, \
674 { XFS_AGF_LENGTH, "LENGTH" }, \
675 { XFS_AGF_ROOTS, "ROOTS" }, \
676 { XFS_AGF_LEVELS, "LEVELS" }, \
677 { XFS_AGF_FLFIRST, "FLFIRST" }, \
678 { XFS_AGF_FLLAST, "FLLAST" }, \
679 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
680 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
681 { XFS_AGF_LONGEST, "LONGEST" }, \
682 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
683 { XFS_AGF_UUID, "UUID" }
684
685 /* disk block (xfs_daddr_t) in the AG */
686 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
687 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
688 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
689
690 /*
691 * Size of the unlinked inode hash table in the agi.
692 */
693 #define XFS_AGI_UNLINKED_BUCKETS 64
694
695 typedef struct xfs_agi {
696 /*
697 * Common allocation group header information
698 */
699 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
700 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
701 __be32 agi_seqno; /* sequence # starting from 0 */
702 __be32 agi_length; /* size in blocks of a.g. */
703 /*
704 * Inode information
705 * Inodes are mapped by interpreting the inode number, so no
706 * mapping data is needed here.
707 */
708 __be32 agi_count; /* count of allocated inodes */
709 __be32 agi_root; /* root of inode btree */
710 __be32 agi_level; /* levels in inode btree */
711 __be32 agi_freecount; /* number of free inodes */
712
713 __be32 agi_newino; /* new inode just allocated */
714 __be32 agi_dirino; /* last directory inode chunk */
715 /*
716 * Hash table of inodes which have been unlinked but are
717 * still being referenced.
718 */
719 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
720 /*
721 * This marks the end of logging region 1 and start of logging region 2.
722 */
723 uuid_t agi_uuid; /* uuid of filesystem */
724 __be32 agi_crc; /* crc of agi sector */
725 __be32 agi_pad32;
726 __be64 agi_lsn; /* last write sequence */
727
728 __be32 agi_free_root; /* root of the free inode btree */
729 __be32 agi_free_level;/* levels in free inode btree */
730
731 /* structure must be padded to 64 bit alignment */
732 } xfs_agi_t;
733
734 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
735
736 #define XFS_AGI_MAGICNUM (1 << 0)
737 #define XFS_AGI_VERSIONNUM (1 << 1)
738 #define XFS_AGI_SEQNO (1 << 2)
739 #define XFS_AGI_LENGTH (1 << 3)
740 #define XFS_AGI_COUNT (1 << 4)
741 #define XFS_AGI_ROOT (1 << 5)
742 #define XFS_AGI_LEVEL (1 << 6)
743 #define XFS_AGI_FREECOUNT (1 << 7)
744 #define XFS_AGI_NEWINO (1 << 8)
745 #define XFS_AGI_DIRINO (1 << 9)
746 #define XFS_AGI_UNLINKED (1 << 10)
747 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
748 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
749 #define XFS_AGI_FREE_ROOT (1 << 11)
750 #define XFS_AGI_FREE_LEVEL (1 << 12)
751 #define XFS_AGI_NUM_BITS_R2 13
752
753 /* disk block (xfs_daddr_t) in the AG */
754 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
755 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
756 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
757
758 /*
759 * The third a.g. block contains the a.g. freelist, an array
760 * of block pointers to blocks owned by the allocation btree code.
761 */
762 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
763 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
764 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
765
766 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
767 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
768 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
769 (__be32 *)(bp)->b_addr)
770
771 /*
772 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of
773 * slots in the beginning of the block for a proper header with the
774 * location information and CRC.
775 */
776 #define XFS_AGFL_SIZE(mp) \
777 (((mp)->m_sb.sb_sectsize - \
778 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
779 sizeof(struct xfs_agfl) : 0)) / \
780 sizeof(xfs_agblock_t))
781
782 typedef struct xfs_agfl {
783 __be32 agfl_magicnum;
784 __be32 agfl_seqno;
785 uuid_t agfl_uuid;
786 __be64 agfl_lsn;
787 __be32 agfl_crc;
788 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */
789 } __attribute__((packed)) xfs_agfl_t;
790
791 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
792
793 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
794 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
795 #define XFS_FSB_TO_AGNO(mp,fsbno) \
796 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
797 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
798 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
799 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
800 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
801 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
802 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
803
804 /*
805 * For checking for bad ranges of xfs_daddr_t's, covering multiple
806 * allocation groups or a single xfs_daddr_t that's a superblock copy.
807 */
808 #define XFS_AG_CHECK_DADDR(mp,d,len) \
809 ((len) == 1 ? \
810 ASSERT((d) == XFS_SB_DADDR || \
811 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
812 ASSERT(xfs_daddr_to_agno(mp, d) == \
813 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
814
815 typedef struct xfs_timestamp {
816 __be32 t_sec; /* timestamp seconds */
817 __be32 t_nsec; /* timestamp nanoseconds */
818 } xfs_timestamp_t;
819
820 /*
821 * On-disk inode structure.
822 *
823 * This is just the header or "dinode core", the inode is expanded to fill a
824 * variable size the leftover area split into a data and an attribute fork.
825 * The format of the data and attribute fork depends on the format of the
826 * inode as indicated by di_format and di_aformat. To access the data and
827 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
828 * below.
829 *
830 * There is a very similar struct icdinode in xfs_inode which matches the
831 * layout of the first 96 bytes of this structure, but is kept in native
832 * format instead of big endian.
833 *
834 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
835 * padding field for v3 inodes.
836 */
837 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
838 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3)
839 typedef struct xfs_dinode {
840 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
841 __be16 di_mode; /* mode and type of file */
842 __u8 di_version; /* inode version */
843 __u8 di_format; /* format of di_c data */
844 __be16 di_onlink; /* old number of links to file */
845 __be32 di_uid; /* owner's user id */
846 __be32 di_gid; /* owner's group id */
847 __be32 di_nlink; /* number of links to file */
848 __be16 di_projid_lo; /* lower part of owner's project id */
849 __be16 di_projid_hi; /* higher part owner's project id */
850 __u8 di_pad[6]; /* unused, zeroed space */
851 __be16 di_flushiter; /* incremented on flush */
852 xfs_timestamp_t di_atime; /* time last accessed */
853 xfs_timestamp_t di_mtime; /* time last modified */
854 xfs_timestamp_t di_ctime; /* time created/inode modified */
855 __be64 di_size; /* number of bytes in file */
856 __be64 di_nblocks; /* # of direct & btree blocks used */
857 __be32 di_extsize; /* basic/minimum extent size for file */
858 __be32 di_nextents; /* number of extents in data fork */
859 __be16 di_anextents; /* number of extents in attribute fork*/
860 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
861 __s8 di_aformat; /* format of attr fork's data */
862 __be32 di_dmevmask; /* DMIG event mask */
863 __be16 di_dmstate; /* DMIG state info */
864 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
865 __be32 di_gen; /* generation number */
866
867 /* di_next_unlinked is the only non-core field in the old dinode */
868 __be32 di_next_unlinked;/* agi unlinked list ptr */
869
870 /* start of the extended dinode, writable fields */
871 __le32 di_crc; /* CRC of the inode */
872 __be64 di_changecount; /* number of attribute changes */
873 __be64 di_lsn; /* flush sequence */
874 __be64 di_flags2; /* more random flags */
875 __u8 di_pad2[16]; /* more padding for future expansion */
876
877 /* fields only written to during inode creation */
878 xfs_timestamp_t di_crtime; /* time created */
879 __be64 di_ino; /* inode number */
880 uuid_t di_uuid; /* UUID of the filesystem */
881
882 /* structure must be padded to 64 bit alignment */
883 } xfs_dinode_t;
884
885 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
886
887 #define DI_MAX_FLUSH 0xffff
888
889 /*
890 * Size of the core inode on disk. Version 1 and 2 inodes have
891 * the same size, but version 3 has grown a few additional fields.
892 */
xfs_dinode_size(int version)893 static inline uint xfs_dinode_size(int version)
894 {
895 if (version == 3)
896 return sizeof(struct xfs_dinode);
897 return offsetof(struct xfs_dinode, di_crc);
898 }
899
900 /*
901 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
902 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
903 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
904 */
905 #define XFS_MAXLINK ((1U << 31) - 1U)
906 #define XFS_MAXLINK_1 65535U
907
908 /*
909 * Values for di_format
910 */
911 typedef enum xfs_dinode_fmt {
912 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
913 XFS_DINODE_FMT_LOCAL, /* bulk data */
914 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
915 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
916 XFS_DINODE_FMT_UUID /* uuid_t */
917 } xfs_dinode_fmt_t;
918
919 /*
920 * Inode minimum and maximum sizes.
921 */
922 #define XFS_DINODE_MIN_LOG 8
923 #define XFS_DINODE_MAX_LOG 11
924 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
925 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
926
927 /*
928 * Inode size for given fs.
929 */
930 #define XFS_LITINO(mp, version) \
931 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
932
933 /*
934 * Inode data & attribute fork sizes, per inode.
935 */
936 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
937 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
938
939 #define XFS_DFORK_DSIZE(dip,mp) \
940 (XFS_DFORK_Q(dip) ? \
941 XFS_DFORK_BOFF(dip) : \
942 XFS_LITINO(mp, (dip)->di_version))
943 #define XFS_DFORK_ASIZE(dip,mp) \
944 (XFS_DFORK_Q(dip) ? \
945 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
946 0)
947 #define XFS_DFORK_SIZE(dip,mp,w) \
948 ((w) == XFS_DATA_FORK ? \
949 XFS_DFORK_DSIZE(dip, mp) : \
950 XFS_DFORK_ASIZE(dip, mp))
951
952 /*
953 * Return pointers to the data or attribute forks.
954 */
955 #define XFS_DFORK_DPTR(dip) \
956 ((char *)dip + xfs_dinode_size(dip->di_version))
957 #define XFS_DFORK_APTR(dip) \
958 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
959 #define XFS_DFORK_PTR(dip,w) \
960 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
961
962 #define XFS_DFORK_FORMAT(dip,w) \
963 ((w) == XFS_DATA_FORK ? \
964 (dip)->di_format : \
965 (dip)->di_aformat)
966 #define XFS_DFORK_NEXTENTS(dip,w) \
967 ((w) == XFS_DATA_FORK ? \
968 be32_to_cpu((dip)->di_nextents) : \
969 be16_to_cpu((dip)->di_anextents))
970
971 /*
972 * For block and character special files the 32bit dev_t is stored at the
973 * beginning of the data fork.
974 */
xfs_dinode_get_rdev(struct xfs_dinode * dip)975 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
976 {
977 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
978 }
979
xfs_dinode_put_rdev(struct xfs_dinode * dip,xfs_dev_t rdev)980 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
981 {
982 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
983 }
984
985 /*
986 * Values for di_flags
987 * There should be a one-to-one correspondence between these flags and the
988 * XFS_XFLAG_s.
989 */
990 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
991 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
992 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
993 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
994 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
995 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
996 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
997 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
998 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
999 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1000 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1001 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1002 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1003 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1004 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1005 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1006 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1007 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1008 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1009 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1010 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1011 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1012 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1013 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1014 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1015 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1016 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1017 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1018 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1019 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1020
1021 #define XFS_DIFLAG_ANY \
1022 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1023 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1024 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1025 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1026 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1027
1028 /*
1029 * Inode number format:
1030 * low inopblog bits - offset in block
1031 * next agblklog bits - block number in ag
1032 * next agno_log bits - ag number
1033 * high agno_log-agblklog-inopblog bits - 0
1034 */
1035 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1)
1036 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1037 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1038 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
1039 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1040 #define XFS_INO_BITS(mp) \
1041 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1042 #define XFS_INO_TO_AGNO(mp,i) \
1043 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1044 #define XFS_INO_TO_AGINO(mp,i) \
1045 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1046 #define XFS_INO_TO_AGBNO(mp,i) \
1047 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1048 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1049 #define XFS_INO_TO_OFFSET(mp,i) \
1050 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1051 #define XFS_INO_TO_FSB(mp,i) \
1052 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1053 #define XFS_AGINO_TO_INO(mp,a,i) \
1054 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1055 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1056 #define XFS_AGINO_TO_OFFSET(mp,i) \
1057 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1058 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1059 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1060
1061 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1062 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1063
1064 /*
1065 * RealTime Device format definitions
1066 */
1067
1068 /* Min and max rt extent sizes, specified in bytes */
1069 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1070 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1071 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1072
1073 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1074 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1075 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
1076 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
1077
1078 /*
1079 * RT Summary and bit manipulation macros.
1080 */
1081 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1082 #define XFS_SUMOFFSTOBLOCK(mp,s) \
1083 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1084 #define XFS_SUMPTR(mp,bp,so) \
1085 ((xfs_suminfo_t *)((bp)->b_addr + \
1086 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1087
1088 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
1089 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
1090 #define XFS_BITTOWORD(mp,bi) \
1091 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1092
1093 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1094 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1095
1096 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
1097 #define XFS_RTHIBIT(w) xfs_highbit32(w)
1098
1099 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
1100
1101 /*
1102 * Dquot and dquot block format definitions
1103 */
1104 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1105 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */
1106
1107 /*
1108 * This is the main portion of the on-disk representation of quota
1109 * information for a user. This is the q_core of the xfs_dquot_t that
1110 * is kept in kernel memory. We pad this with some more expansion room
1111 * to construct the on disk structure.
1112 */
1113 typedef struct xfs_disk_dquot {
1114 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1115 __u8 d_version; /* dquot version */
1116 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
1117 __be32 d_id; /* user,project,group id */
1118 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1119 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1120 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1121 __be64 d_ino_softlimit;/* preferred inode limit */
1122 __be64 d_bcount; /* disk blocks owned by the user */
1123 __be64 d_icount; /* inodes owned by the user */
1124 __be32 d_itimer; /* zero if within inode limits if not,
1125 this is when we refuse service */
1126 __be32 d_btimer; /* similar to above; for disk blocks */
1127 __be16 d_iwarns; /* warnings issued wrt num inodes */
1128 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1129 __be32 d_pad0; /* 64 bit align */
1130 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1131 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1132 __be64 d_rtbcount; /* realtime blocks owned */
1133 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1134 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1135 __be16 d_pad;
1136 } xfs_disk_dquot_t;
1137
1138 /*
1139 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1140 * carrying the unnecessary padding would be a waste of memory.
1141 */
1142 typedef struct xfs_dqblk {
1143 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */
1144 char dd_fill[4]; /* filling for posterity */
1145
1146 /*
1147 * These two are only present on filesystems with the CRC bits set.
1148 */
1149 __be32 dd_crc; /* checksum */
1150 __be64 dd_lsn; /* last modification in log */
1151 uuid_t dd_uuid; /* location information */
1152 } xfs_dqblk_t;
1153
1154 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1155
1156 /*
1157 * Remote symlink format and access functions.
1158 */
1159 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1160
1161 struct xfs_dsymlink_hdr {
1162 __be32 sl_magic;
1163 __be32 sl_offset;
1164 __be32 sl_bytes;
1165 __be32 sl_crc;
1166 uuid_t sl_uuid;
1167 __be64 sl_owner;
1168 __be64 sl_blkno;
1169 __be64 sl_lsn;
1170 };
1171
1172 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1173
1174 /*
1175 * The maximum pathlen is 1024 bytes. Since the minimum file system
1176 * blocksize is 512 bytes, we can get a max of 3 extents back from
1177 * bmapi when crc headers are taken into account.
1178 */
1179 #define XFS_SYMLINK_MAPS 3
1180
1181 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1182 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1183 sizeof(struct xfs_dsymlink_hdr) : 0))
1184
1185
1186 /*
1187 * Allocation Btree format definitions
1188 *
1189 * There are two on-disk btrees, one sorted by blockno and one sorted
1190 * by blockcount and blockno. All blocks look the same to make the code
1191 * simpler; if we have time later, we'll make the optimizations.
1192 */
1193 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1194 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1195 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1196 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1197
1198 /*
1199 * Data record/key structure
1200 */
1201 typedef struct xfs_alloc_rec {
1202 __be32 ar_startblock; /* starting block number */
1203 __be32 ar_blockcount; /* count of free blocks */
1204 } xfs_alloc_rec_t, xfs_alloc_key_t;
1205
1206 typedef struct xfs_alloc_rec_incore {
1207 xfs_agblock_t ar_startblock; /* starting block number */
1208 xfs_extlen_t ar_blockcount; /* count of free blocks */
1209 } xfs_alloc_rec_incore_t;
1210
1211 /* btree pointer type */
1212 typedef __be32 xfs_alloc_ptr_t;
1213
1214 /*
1215 * Block numbers in the AG:
1216 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1217 */
1218 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1219 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1220
1221
1222 /*
1223 * Inode Allocation Btree format definitions
1224 *
1225 * There is a btree for the inode map per allocation group.
1226 */
1227 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1228 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1229 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1230 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1231
1232 typedef __uint64_t xfs_inofree_t;
1233 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1234 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1235 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1236 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1237
1238 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1239 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t))
1240 #define XFS_INODES_PER_HOLEMASK_BIT \
1241 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t)))
1242
xfs_inobt_maskn(int i,int n)1243 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1244 {
1245 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1246 }
1247
1248 /*
1249 * The on-disk inode record structure has two formats. The original "full"
1250 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1251 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1252 * count.
1253 *
1254 * The holemask of the sparse record format allows an inode chunk to have holes
1255 * that refer to blocks not owned by the inode record. This facilitates inode
1256 * allocation in the event of severe free space fragmentation.
1257 */
1258 typedef struct xfs_inobt_rec {
1259 __be32 ir_startino; /* starting inode number */
1260 union {
1261 struct {
1262 __be32 ir_freecount; /* count of free inodes */
1263 } f;
1264 struct {
1265 __be16 ir_holemask;/* hole mask for sparse chunks */
1266 __u8 ir_count; /* total inode count */
1267 __u8 ir_freecount; /* count of free inodes */
1268 } sp;
1269 } ir_u;
1270 __be64 ir_free; /* free inode mask */
1271 } xfs_inobt_rec_t;
1272
1273 typedef struct xfs_inobt_rec_incore {
1274 xfs_agino_t ir_startino; /* starting inode number */
1275 __uint16_t ir_holemask; /* hole mask for sparse chunks */
1276 __uint8_t ir_count; /* total inode count */
1277 __uint8_t ir_freecount; /* count of free inodes (set bits) */
1278 xfs_inofree_t ir_free; /* free inode mask */
1279 } xfs_inobt_rec_incore_t;
1280
xfs_inobt_issparse(uint16_t holemask)1281 static inline bool xfs_inobt_issparse(uint16_t holemask)
1282 {
1283 /* non-zero holemask represents a sparse rec. */
1284 return holemask;
1285 }
1286
1287 /*
1288 * Key structure
1289 */
1290 typedef struct xfs_inobt_key {
1291 __be32 ir_startino; /* starting inode number */
1292 } xfs_inobt_key_t;
1293
1294 /* btree pointer type */
1295 typedef __be32 xfs_inobt_ptr_t;
1296
1297 /*
1298 * block numbers in the AG.
1299 */
1300 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1301 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1302
1303 /*
1304 * The first data block of an AG depends on whether the filesystem was formatted
1305 * with the finobt feature. If so, account for the finobt reserved root btree
1306 * block.
1307 */
1308 #define XFS_PREALLOC_BLOCKS(mp) \
1309 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1310 XFS_FIBT_BLOCK(mp) + 1 : \
1311 XFS_IBT_BLOCK(mp) + 1)
1312
1313
1314
1315 /*
1316 * BMAP Btree format definitions
1317 *
1318 * This includes both the root block definition that sits inside an inode fork
1319 * and the record/pointer formats for the leaf/node in the blocks.
1320 */
1321 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1322 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1323
1324 /*
1325 * Bmap root header, on-disk form only.
1326 */
1327 typedef struct xfs_bmdr_block {
1328 __be16 bb_level; /* 0 is a leaf */
1329 __be16 bb_numrecs; /* current # of data records */
1330 } xfs_bmdr_block_t;
1331
1332 /*
1333 * Bmap btree record and extent descriptor.
1334 * l0:63 is an extent flag (value 1 indicates non-normal).
1335 * l0:9-62 are startoff.
1336 * l0:0-8 and l1:21-63 are startblock.
1337 * l1:0-20 are blockcount.
1338 */
1339 #define BMBT_EXNTFLAG_BITLEN 1
1340 #define BMBT_STARTOFF_BITLEN 54
1341 #define BMBT_STARTBLOCK_BITLEN 52
1342 #define BMBT_BLOCKCOUNT_BITLEN 21
1343
1344 typedef struct xfs_bmbt_rec {
1345 __be64 l0, l1;
1346 } xfs_bmbt_rec_t;
1347
1348 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1349 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1350
1351 typedef struct xfs_bmbt_rec_host {
1352 __uint64_t l0, l1;
1353 } xfs_bmbt_rec_host_t;
1354
1355 /*
1356 * Values and macros for delayed-allocation startblock fields.
1357 */
1358 #define STARTBLOCKVALBITS 17
1359 #define STARTBLOCKMASKBITS (15 + 20)
1360 #define STARTBLOCKMASK \
1361 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1362
isnullstartblock(xfs_fsblock_t x)1363 static inline int isnullstartblock(xfs_fsblock_t x)
1364 {
1365 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1366 }
1367
nullstartblock(int k)1368 static inline xfs_fsblock_t nullstartblock(int k)
1369 {
1370 ASSERT(k < (1 << STARTBLOCKVALBITS));
1371 return STARTBLOCKMASK | (k);
1372 }
1373
startblockval(xfs_fsblock_t x)1374 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1375 {
1376 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1377 }
1378
1379 /*
1380 * Possible extent formats.
1381 */
1382 typedef enum {
1383 XFS_EXTFMT_NOSTATE = 0,
1384 XFS_EXTFMT_HASSTATE
1385 } xfs_exntfmt_t;
1386
1387 /*
1388 * Possible extent states.
1389 */
1390 typedef enum {
1391 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
1392 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
1393 } xfs_exntst_t;
1394
1395 /*
1396 * Incore version of above.
1397 */
1398 typedef struct xfs_bmbt_irec
1399 {
1400 xfs_fileoff_t br_startoff; /* starting file offset */
1401 xfs_fsblock_t br_startblock; /* starting block number */
1402 xfs_filblks_t br_blockcount; /* number of blocks */
1403 xfs_exntst_t br_state; /* extent state */
1404 } xfs_bmbt_irec_t;
1405
1406 /*
1407 * Key structure for non-leaf levels of the tree.
1408 */
1409 typedef struct xfs_bmbt_key {
1410 __be64 br_startoff; /* starting file offset */
1411 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1412
1413 /* btree pointer type */
1414 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1415
1416
1417 /*
1418 * Generic Btree block format definitions
1419 *
1420 * This is a combination of the actual format used on disk for short and long
1421 * format btrees. The first three fields are shared by both format, but the
1422 * pointers are different and should be used with care.
1423 *
1424 * To get the size of the actual short or long form headers please use the size
1425 * macros below. Never use sizeof(xfs_btree_block).
1426 *
1427 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1428 * with the crc feature bit, and all accesses to them must be conditional on
1429 * that flag.
1430 */
1431 struct xfs_btree_block {
1432 __be32 bb_magic; /* magic number for block type */
1433 __be16 bb_level; /* 0 is a leaf */
1434 __be16 bb_numrecs; /* current # of data records */
1435 union {
1436 struct {
1437 __be32 bb_leftsib;
1438 __be32 bb_rightsib;
1439
1440 __be64 bb_blkno;
1441 __be64 bb_lsn;
1442 uuid_t bb_uuid;
1443 __be32 bb_owner;
1444 __le32 bb_crc;
1445 } s; /* short form pointers */
1446 struct {
1447 __be64 bb_leftsib;
1448 __be64 bb_rightsib;
1449
1450 __be64 bb_blkno;
1451 __be64 bb_lsn;
1452 uuid_t bb_uuid;
1453 __be64 bb_owner;
1454 __le32 bb_crc;
1455 __be32 bb_pad; /* padding for alignment */
1456 } l; /* long form pointers */
1457 } bb_u; /* rest */
1458 };
1459
1460 #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
1461 #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
1462
1463 /* sizes of CRC enabled btree blocks */
1464 #define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40)
1465 #define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48)
1466
1467 #define XFS_BTREE_SBLOCK_CRC_OFF \
1468 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1469 #define XFS_BTREE_LBLOCK_CRC_OFF \
1470 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1471
1472 /*
1473 * On-disk XFS access control list structure.
1474 */
1475 struct xfs_acl_entry {
1476 __be32 ae_tag;
1477 __be32 ae_id;
1478 __be16 ae_perm;
1479 __be16 ae_pad; /* fill the implicit hole in the structure */
1480 };
1481
1482 struct xfs_acl {
1483 __be32 acl_cnt;
1484 struct xfs_acl_entry acl_entry[0];
1485 };
1486
1487 /*
1488 * The number of ACL entries allowed is defined by the on-disk format.
1489 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1490 * limited only by the maximum size of the xattr that stores the information.
1491 */
1492 #define XFS_ACL_MAX_ENTRIES(mp) \
1493 (xfs_sb_version_hascrc(&mp->m_sb) \
1494 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1495 sizeof(struct xfs_acl_entry) \
1496 : 25)
1497
1498 #define XFS_ACL_SIZE(cnt) \
1499 (sizeof(struct xfs_acl) + \
1500 sizeof(struct xfs_acl_entry) * cnt)
1501
1502 #define XFS_ACL_MAX_SIZE(mp) \
1503 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1504
1505
1506 /* On-disk XFS extended attribute names */
1507 #define SGI_ACL_FILE "SGI_ACL_FILE"
1508 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1509 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1510 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1511
1512 #endif /* __XFS_FORMAT_H__ */
1513