]> git.ipfire.org Git - thirdparty/xfsprogs-dev.git/blob - libxfs/xfs_format.h
projects / thirdparty / xfsprogs-dev.git / blob
? search:


0d34221676edc0b900d39d90e548c0b010bb8fbd
[thirdparty/xfsprogs-dev.git] / libxfs / xfs_format.h
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_FORMAT_H__
7 #define __XFS_FORMAT_H__
8
9 /*
10 * XFS On Disk Format Definitions
11 *
12 * This header file defines all the on-disk format definitions for
13 * general XFS objects. Directory and attribute related objects are defined in
14 * xfs_da_format.h, which log and log item formats are defined in
15 * xfs_log_format.h. Everything else goes here.
16 */
17
18 struct xfs_mount;
19 struct xfs_trans;
20 struct xfs_inode;
21 struct xfs_buf;
22 struct xfs_ifork;
23
24 /*
25 * Super block
26 * Fits into a sector-sized buffer at address 0 of each allocation group.
27 * Only the first of these is ever updated except during growfs.
28 */
29 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
30 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
31 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
32 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
33 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
34 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
35 #define XFS_SB_VERSION_NUMBITS 0x000f
36 #define XFS_SB_VERSION_ALLFBITS 0xfff0
37 #define XFS_SB_VERSION_ATTRBIT 0x0010
38 #define XFS_SB_VERSION_NLINKBIT 0x0020
39 #define XFS_SB_VERSION_QUOTABIT 0x0040
40 #define XFS_SB_VERSION_ALIGNBIT 0x0080
41 #define XFS_SB_VERSION_DALIGNBIT 0x0100
42 #define XFS_SB_VERSION_SHAREDBIT 0x0200
43 #define XFS_SB_VERSION_LOGV2BIT 0x0400
44 #define XFS_SB_VERSION_SECTORBIT 0x0800
45 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
46 #define XFS_SB_VERSION_DIRV2BIT 0x2000
47 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
48 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
49
50 /*
51 * The size of a single extended attribute on disk is limited by
52 * the size of index values within the attribute entries themselves.
53 * These are be16 fields, so we can only support attribute data
54 * sizes up to 2^16 bytes in length.
55 */
56 #define XFS_XATTR_SIZE_MAX (1 << 16)
57
58 /*
59 * Supported feature bit list is just all bits in the versionnum field because
60 * we've used them all up and understand them all. Except, of course, for the
61 * shared superblock bit, which nobody knows what it does and so is unsupported.
62 */
63 #define XFS_SB_VERSION_OKBITS \
64 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
65 ~XFS_SB_VERSION_SHAREDBIT)
66
67 /*
68 * There are two words to hold XFS "feature" bits: the original
69 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
70 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
71 *
72 * These defines represent bits in sb_features2.
73 */
74 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
75 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
76 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
77 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
78 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
79 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
80 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
81 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
82
83 #define XFS_SB_VERSION2_OKBITS \
84 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
85 XFS_SB_VERSION2_ATTR2BIT | \
86 XFS_SB_VERSION2_PROJID32BIT | \
87 XFS_SB_VERSION2_FTYPE)
88
89 /* Maximum size of the xfs filesystem label, no terminating NULL */
90 #define XFSLABEL_MAX 12
91
92 /*
93 * Superblock - in core version. Must match the ondisk version below.
94 * Must be padded to 64 bit alignment.
95 */
96 typedef struct xfs_sb {
97 uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
98 uint32_t sb_blocksize; /* logical block size, bytes */
99 xfs_rfsblock_t sb_dblocks; /* number of data blocks */
100 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
101 xfs_rtblock_t sb_rextents; /* number of realtime extents */
102 uuid_t sb_uuid; /* user-visible file system unique id */
103 xfs_fsblock_t sb_logstart; /* starting block of log if internal */
104 xfs_ino_t sb_rootino; /* root inode number */
105 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
106 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
107 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
108 xfs_agblock_t sb_agblocks; /* size of an allocation group */
109 xfs_agnumber_t sb_agcount; /* number of allocation groups */
110 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
111 xfs_extlen_t sb_logblocks; /* number of log blocks */
112 uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
113 uint16_t sb_sectsize; /* volume sector size, bytes */
114 uint16_t sb_inodesize; /* inode size, bytes */
115 uint16_t sb_inopblock; /* inodes per block */
116 char sb_fname[XFSLABEL_MAX]; /* file system name */
117 uint8_t sb_blocklog; /* log2 of sb_blocksize */
118 uint8_t sb_sectlog; /* log2 of sb_sectsize */
119 uint8_t sb_inodelog; /* log2 of sb_inodesize */
120 uint8_t sb_inopblog; /* log2 of sb_inopblock */
121 uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
122 uint8_t sb_rextslog; /* log2 of sb_rextents */
123 uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
124 uint8_t sb_imax_pct; /* max % of fs for inode space */
125 /* statistics */
126 /*
127 * These fields must remain contiguous. If you really
128 * want to change their layout, make sure you fix the
129 * code in xfs_trans_apply_sb_deltas().
130 */
131 uint64_t sb_icount; /* allocated inodes */
132 uint64_t sb_ifree; /* free inodes */
133 uint64_t sb_fdblocks; /* free data blocks */
134 uint64_t sb_frextents; /* free realtime extents */
135 /*
136 * End contiguous fields.
137 */
138 xfs_ino_t sb_uquotino; /* user quota inode */
139 xfs_ino_t sb_gquotino; /* group quota inode */
140 uint16_t sb_qflags; /* quota flags */
141 uint8_t sb_flags; /* misc. flags */
142 uint8_t sb_shared_vn; /* shared version number */
143 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
144 uint32_t sb_unit; /* stripe or raid unit */
145 uint32_t sb_width; /* stripe or raid width */
146 uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
147 uint8_t sb_logsectlog; /* log2 of the log sector size */
148 uint16_t sb_logsectsize; /* sector size for the log, bytes */
149 uint32_t sb_logsunit; /* stripe unit size for the log */
150 uint32_t sb_features2; /* additional feature bits */
151
152 /*
153 * bad features2 field as a result of failing to pad the sb structure to
154 * 64 bits. Some machines will be using this field for features2 bits.
155 * Easiest just to mark it bad and not use it for anything else.
156 *
157 * This is not kept up to date in memory; it is always overwritten by
158 * the value in sb_features2 when formatting the incore superblock to
159 * the disk buffer.
160 */
161 uint32_t sb_bad_features2;
162
163 /* version 5 superblock fields start here */
164
165 /* feature masks */
166 uint32_t sb_features_compat;
167 uint32_t sb_features_ro_compat;
168 uint32_t sb_features_incompat;
169 uint32_t sb_features_log_incompat;
170
171 uint32_t sb_crc; /* superblock crc */
172 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
173
174 xfs_ino_t sb_pquotino; /* project quota inode */
175 xfs_lsn_t sb_lsn; /* last write sequence */
176 uuid_t sb_meta_uuid; /* metadata file system unique id */
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 */
187 typedef struct xfs_dsb {
188 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
189 __be32 sb_blocksize; /* logical block size, bytes */
190 __be64 sb_dblocks; /* number of data blocks */
191 __be64 sb_rblocks; /* number of realtime blocks */
192 __be64 sb_rextents; /* number of realtime extents */
193 uuid_t sb_uuid; /* user-visible file system unique id */
194 __be64 sb_logstart; /* starting block of log if internal */
195 __be64 sb_rootino; /* root inode number */
196 __be64 sb_rbmino; /* bitmap inode for realtime extents */
197 __be64 sb_rsumino; /* summary inode for rt bitmap */
198 __be32 sb_rextsize; /* realtime extent size, blocks */
199 __be32 sb_agblocks; /* size of an allocation group */
200 __be32 sb_agcount; /* number of allocation groups */
201 __be32 sb_rbmblocks; /* number of rt bitmap blocks */
202 __be32 sb_logblocks; /* number of log blocks */
203 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */
204 __be16 sb_sectsize; /* volume sector size, bytes */
205 __be16 sb_inodesize; /* inode size, bytes */
206 __be16 sb_inopblock; /* inodes per block */
207 char sb_fname[XFSLABEL_MAX]; /* file system name */
208 __u8 sb_blocklog; /* log2 of sb_blocksize */
209 __u8 sb_sectlog; /* log2 of sb_sectsize */
210 __u8 sb_inodelog; /* log2 of sb_inodesize */
211 __u8 sb_inopblog; /* log2 of sb_inopblock */
212 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
213 __u8 sb_rextslog; /* log2 of sb_rextents */
214 __u8 sb_inprogress; /* mkfs is in progress, don't mount */
215 __u8 sb_imax_pct; /* max % of fs for inode space */
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 */
259 __be32 sb_spino_align; /* sparse inode chunk alignment */
260
261 __be64 sb_pquotino; /* project quota inode */
262 __be64 sb_lsn; /* last write sequence */
263 uuid_t sb_meta_uuid; /* metadata file system unique id */
264
265 /* must be padded to 64 bit alignment */
266 } xfs_dsb_t;
267
268
269 /*
270 * Misc. Flags - warning - these will be cleared by xfs_repair unless
271 * a feature bit is set when the flag is used.
272 */
273 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
274 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
275
276 /*
277 * define max. shared version we can interoperate with
278 */
279 #define XFS_SB_MAX_SHARED_VN 0
280
281 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
282
283 /*
284 * The first XFS version we support is a v4 superblock with V2 directories.
285 */
286 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
287 {
288 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
289 return false;
290 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
291 return false;
292
293 /* check for unknown features in the fs */
294 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
295 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
296 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
297 return false;
298
299 return true;
300 }
301
302 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
303 {
304 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
305 return true;
306 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
307 return xfs_sb_good_v4_features(sbp);
308 return false;
309 }
310
311 static inline bool xfs_sb_version_hasrealtime(struct xfs_sb *sbp)
312 {
313 return sbp->sb_rblocks > 0;
314 }
315
316 /*
317 * Detect a mismatched features2 field. Older kernels read/wrote
318 * this into the wrong slot, so to be safe we keep them in sync.
319 */
320 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
321 {
322 return sbp->sb_bad_features2 != sbp->sb_features2;
323 }
324
325 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
326 {
327 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
328 }
329
330 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
331 {
332 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
333 }
334
335 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
336 {
337 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
338 }
339
340 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
341 {
342 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
343 }
344
345 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
346 {
347 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
348 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
349 }
350
351 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
352 {
353 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
354 }
355
356 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
357 {
358 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
359 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
360 }
361
362 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
363 {
364 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
365 }
366
367 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
368 {
369 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
370 }
371
372 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
373 {
374 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
375 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
376 }
377
378 /*
379 * sb_features2 bit version macros.
380 */
381 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
382 {
383 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
384 (xfs_sb_version_hasmorebits(sbp) &&
385 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
386 }
387
388 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
389 {
390 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
391 (xfs_sb_version_hasmorebits(sbp) &&
392 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
393 }
394
395 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
396 {
397 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
398 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
399 }
400
401 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
402 {
403 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
404 if (!sbp->sb_features2)
405 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
406 }
407
408 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
409 {
410 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
411 (xfs_sb_version_hasmorebits(sbp) &&
412 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
413 }
414
415 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
416 {
417 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
418 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
419 }
420
421 /*
422 * Extended v5 superblock feature masks. These are to be used for new v5
423 * superblock features only.
424 *
425 * Compat features are new features that old kernels will not notice or affect
426 * and so can mount read-write without issues.
427 *
428 * RO-Compat (read only) are features that old kernels can read but will break
429 * if they write. Hence only read-only mounts of such filesystems are allowed on
430 * kernels that don't support the feature bit.
431 *
432 * InCompat features are features which old kernels will not understand and so
433 * must not mount.
434 *
435 * Log-InCompat features are for changes to log formats or new transactions that
436 * can't be replayed on older kernels. The fields are set when the filesystem is
437 * mounted, and a clean unmount clears the fields.
438 */
439 #define XFS_SB_FEAT_COMPAT_ALL 0
440 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
441 static inline bool
442 xfs_sb_has_compat_feature(
443 struct xfs_sb *sbp,
444 uint32_t feature)
445 {
446 return (sbp->sb_features_compat & feature) != 0;
447 }
448
449 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
450 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
451 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
452 #define XFS_SB_FEAT_RO_COMPAT_ALL \
453 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
454 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
455 XFS_SB_FEAT_RO_COMPAT_REFLINK)
456 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
457 static inline bool
458 xfs_sb_has_ro_compat_feature(
459 struct xfs_sb *sbp,
460 uint32_t feature)
461 {
462 return (sbp->sb_features_ro_compat & feature) != 0;
463 }
464
465 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
466 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
467 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
468 #define XFS_SB_FEAT_INCOMPAT_ALL \
469 (XFS_SB_FEAT_INCOMPAT_FTYPE| \
470 XFS_SB_FEAT_INCOMPAT_SPINODES| \
471 XFS_SB_FEAT_INCOMPAT_META_UUID)
472
473 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
474 static inline bool
475 xfs_sb_has_incompat_feature(
476 struct xfs_sb *sbp,
477 uint32_t feature)
478 {
479 return (sbp->sb_features_incompat & feature) != 0;
480 }
481
482 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
483 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
484 static inline bool
485 xfs_sb_has_incompat_log_feature(
486 struct xfs_sb *sbp,
487 uint32_t feature)
488 {
489 return (sbp->sb_features_log_incompat & feature) != 0;
490 }
491
492 /*
493 * V5 superblock specific feature checks
494 */
495 static inline bool xfs_sb_version_hascrc(struct xfs_sb *sbp)
496 {
497 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
498 }
499
500 static inline bool xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
501 {
502 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
503 }
504
505 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
506 {
507 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
508 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
509 (xfs_sb_version_hasmorebits(sbp) &&
510 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
511 }
512
513 static inline bool xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
514 {
515 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
516 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
517 }
518
519 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
520 {
521 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
522 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
523 }
524
525 /*
526 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
527 * is stored separately from the user-visible UUID; this allows the
528 * user-visible UUID to be changed on V5 filesystems which have a
529 * filesystem UUID stamped into every piece of metadata.
530 */
531 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
532 {
533 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
534 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
535 }
536
537 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp)
538 {
539 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
540 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
541 }
542
543 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
544 {
545 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
546 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
547 }
548
549 /*
550 * end of superblock version macros
551 */
552
553 static inline bool
554 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
555 {
556 return (ino == sbp->sb_uquotino ||
557 ino == sbp->sb_gquotino ||
558 ino == sbp->sb_pquotino);
559 }
560
561 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
562 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
563 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
564
565 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
566 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
567 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
568 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
569 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
570
571 /*
572 * File system sector to basic block conversions.
573 */
574 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
575
576 /*
577 * File system block to basic block conversions.
578 */
579 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
580 #define XFS_BB_TO_FSB(mp,bb) \
581 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
582 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
583
584 /*
585 * File system block to byte conversions.
586 */
587 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
588 #define XFS_B_TO_FSB(mp,b) \
589 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
590 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
591 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
592
593 /*
594 * Allocation group header
595 *
596 * This is divided into three structures, placed in sequential 512-byte
597 * buffers after a copy of the superblock (also in a 512-byte buffer).
598 */
599 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
600 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
601 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
602 #define XFS_AGF_VERSION 1
603 #define XFS_AGI_VERSION 1
604
605 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
606 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
607
608 /*
609 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
610 * arrays below.
611 */
612 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
613
614 /*
615 * The second word of agf_levels in the first a.g. overlaps the EFS
616 * superblock's magic number. Since the magic numbers valid for EFS
617 * are > 64k, our value cannot be confused for an EFS superblock's.
618 */
619
620 typedef struct xfs_agf {
621 /*
622 * Common allocation group header information
623 */
624 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
625 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
626 __be32 agf_seqno; /* sequence # starting from 0 */
627 __be32 agf_length; /* size in blocks of a.g. */
628 /*
629 * Freespace and rmap information
630 */
631 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
632 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
633
634 __be32 agf_flfirst; /* first freelist block's index */
635 __be32 agf_fllast; /* last freelist block's index */
636 __be32 agf_flcount; /* count of blocks in freelist */
637 __be32 agf_freeblks; /* total free blocks */
638
639 __be32 agf_longest; /* longest free space */
640 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
641 uuid_t agf_uuid; /* uuid of filesystem */
642
643 __be32 agf_rmap_blocks; /* rmapbt blocks used */
644 __be32 agf_refcount_blocks; /* refcountbt blocks used */
645
646 __be32 agf_refcount_root; /* refcount tree root block */
647 __be32 agf_refcount_level; /* refcount btree levels */
648
649 /*
650 * reserve some contiguous space for future logged fields before we add
651 * the unlogged fields. This makes the range logging via flags and
652 * structure offsets much simpler.
653 */
654 __be64 agf_spare64[14];
655
656 /* unlogged fields, written during buffer writeback. */
657 __be64 agf_lsn; /* last write sequence */
658 __be32 agf_crc; /* crc of agf sector */
659 __be32 agf_spare2;
660
661 /* structure must be padded to 64 bit alignment */
662 } xfs_agf_t;
663
664 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
665
666 #define XFS_AGF_MAGICNUM 0x00000001
667 #define XFS_AGF_VERSIONNUM 0x00000002
668 #define XFS_AGF_SEQNO 0x00000004
669 #define XFS_AGF_LENGTH 0x00000008
670 #define XFS_AGF_ROOTS 0x00000010
671 #define XFS_AGF_LEVELS 0x00000020
672 #define XFS_AGF_FLFIRST 0x00000040
673 #define XFS_AGF_FLLAST 0x00000080
674 #define XFS_AGF_FLCOUNT 0x00000100
675 #define XFS_AGF_FREEBLKS 0x00000200
676 #define XFS_AGF_LONGEST 0x00000400
677 #define XFS_AGF_BTREEBLKS 0x00000800
678 #define XFS_AGF_UUID 0x00001000
679 #define XFS_AGF_RMAP_BLOCKS 0x00002000
680 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
681 #define XFS_AGF_REFCOUNT_ROOT 0x00008000
682 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000
683 #define XFS_AGF_SPARE64 0x00020000
684 #define XFS_AGF_NUM_BITS 18
685 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
686
687 #define XFS_AGF_FLAGS \
688 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
689 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
690 { XFS_AGF_SEQNO, "SEQNO" }, \
691 { XFS_AGF_LENGTH, "LENGTH" }, \
692 { XFS_AGF_ROOTS, "ROOTS" }, \
693 { XFS_AGF_LEVELS, "LEVELS" }, \
694 { XFS_AGF_FLFIRST, "FLFIRST" }, \
695 { XFS_AGF_FLLAST, "FLLAST" }, \
696 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
697 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
698 { XFS_AGF_LONGEST, "LONGEST" }, \
699 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
700 { XFS_AGF_UUID, "UUID" }, \
701 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
702 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
703 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
704 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
705 { XFS_AGF_SPARE64, "SPARE64" }
706
707 /* disk block (xfs_daddr_t) in the AG */
708 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
709 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
710 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
711
712 /*
713 * Size of the unlinked inode hash table in the agi.
714 */
715 #define XFS_AGI_UNLINKED_BUCKETS 64
716
717 typedef struct xfs_agi {
718 /*
719 * Common allocation group header information
720 */
721 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
722 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
723 __be32 agi_seqno; /* sequence # starting from 0 */
724 __be32 agi_length; /* size in blocks of a.g. */
725 /*
726 * Inode information
727 * Inodes are mapped by interpreting the inode number, so no
728 * mapping data is needed here.
729 */
730 __be32 agi_count; /* count of allocated inodes */
731 __be32 agi_root; /* root of inode btree */
732 __be32 agi_level; /* levels in inode btree */
733 __be32 agi_freecount; /* number of free inodes */
734
735 __be32 agi_newino; /* new inode just allocated */
736 __be32 agi_dirino; /* last directory inode chunk */
737 /*
738 * Hash table of inodes which have been unlinked but are
739 * still being referenced.
740 */
741 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
742 /*
743 * This marks the end of logging region 1 and start of logging region 2.
744 */
745 uuid_t agi_uuid; /* uuid of filesystem */
746 __be32 agi_crc; /* crc of agi sector */
747 __be32 agi_pad32;
748 __be64 agi_lsn; /* last write sequence */
749
750 __be32 agi_free_root; /* root of the free inode btree */
751 __be32 agi_free_level;/* levels in free inode btree */
752
753 /* structure must be padded to 64 bit alignment */
754 } xfs_agi_t;
755
756 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
757
758 #define XFS_AGI_MAGICNUM (1 << 0)
759 #define XFS_AGI_VERSIONNUM (1 << 1)
760 #define XFS_AGI_SEQNO (1 << 2)
761 #define XFS_AGI_LENGTH (1 << 3)
762 #define XFS_AGI_COUNT (1 << 4)
763 #define XFS_AGI_ROOT (1 << 5)
764 #define XFS_AGI_LEVEL (1 << 6)
765 #define XFS_AGI_FREECOUNT (1 << 7)
766 #define XFS_AGI_NEWINO (1 << 8)
767 #define XFS_AGI_DIRINO (1 << 9)
768 #define XFS_AGI_UNLINKED (1 << 10)
769 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
770 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
771 #define XFS_AGI_FREE_ROOT (1 << 11)
772 #define XFS_AGI_FREE_LEVEL (1 << 12)
773 #define XFS_AGI_NUM_BITS_R2 13
774
775 /* disk block (xfs_daddr_t) in the AG */
776 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
777 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
778 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
779
780 /*
781 * The third a.g. block contains the a.g. freelist, an array
782 * of block pointers to blocks owned by the allocation btree code.
783 */
784 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
785 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
786 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
787
788 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
789 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
790 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
791 (__be32 *)(bp)->b_addr)
792
793 typedef struct xfs_agfl {
794 __be32 agfl_magicnum;
795 __be32 agfl_seqno;
796 uuid_t agfl_uuid;
797 __be64 agfl_lsn;
798 __be32 agfl_crc;
799 __be32 agfl_bno[]; /* actually xfs_agfl_size(mp) */
800 } __attribute__((packed)) xfs_agfl_t;
801
802 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
803
804 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
805 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
806 #define XFS_FSB_TO_AGNO(mp,fsbno) \
807 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
808 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
809 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
810 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
811 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
812 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
813 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
814
815 /*
816 * For checking for bad ranges of xfs_daddr_t's, covering multiple
817 * allocation groups or a single xfs_daddr_t that's a superblock copy.
818 */
819 #define XFS_AG_CHECK_DADDR(mp,d,len) \
820 ((len) == 1 ? \
821 ASSERT((d) == XFS_SB_DADDR || \
822 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
823 ASSERT(xfs_daddr_to_agno(mp, d) == \
824 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
825
826 typedef struct xfs_timestamp {
827 __be32 t_sec; /* timestamp seconds */
828 __be32 t_nsec; /* timestamp nanoseconds */
829 } xfs_timestamp_t;
830
831 /*
832 * On-disk inode structure.
833 *
834 * This is just the header or "dinode core", the inode is expanded to fill a
835 * variable size the leftover area split into a data and an attribute fork.
836 * The format of the data and attribute fork depends on the format of the
837 * inode as indicated by di_format and di_aformat. To access the data and
838 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
839 * below.
840 *
841 * There is a very similar struct icdinode in xfs_inode which matches the
842 * layout of the first 96 bytes of this structure, but is kept in native
843 * format instead of big endian.
844 *
845 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
846 * padding field for v3 inodes.
847 */
848 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
849 typedef struct xfs_dinode {
850 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
851 __be16 di_mode; /* mode and type of file */
852 __u8 di_version; /* inode version */
853 __u8 di_format; /* format of di_c data */
854 __be16 di_onlink; /* old number of links to file */
855 __be32 di_uid; /* owner's user id */
856 __be32 di_gid; /* owner's group id */
857 __be32 di_nlink; /* number of links to file */
858 __be16 di_projid_lo; /* lower part of owner's project id */
859 __be16 di_projid_hi; /* higher part owner's project id */
860 __u8 di_pad[6]; /* unused, zeroed space */
861 __be16 di_flushiter; /* incremented on flush */
862 xfs_timestamp_t di_atime; /* time last accessed */
863 xfs_timestamp_t di_mtime; /* time last modified */
864 xfs_timestamp_t di_ctime; /* time created/inode modified */
865 __be64 di_size; /* number of bytes in file */
866 __be64 di_nblocks; /* # of direct & btree blocks used */
867 __be32 di_extsize; /* basic/minimum extent size for file */
868 __be32 di_nextents; /* number of extents in data fork */
869 __be16 di_anextents; /* number of extents in attribute fork*/
870 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
871 __s8 di_aformat; /* format of attr fork's data */
872 __be32 di_dmevmask; /* DMIG event mask */
873 __be16 di_dmstate; /* DMIG state info */
874 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
875 __be32 di_gen; /* generation number */
876
877 /* di_next_unlinked is the only non-core field in the old dinode */
878 __be32 di_next_unlinked;/* agi unlinked list ptr */
879
880 /* start of the extended dinode, writable fields */
881 __le32 di_crc; /* CRC of the inode */
882 __be64 di_changecount; /* number of attribute changes */
883 __be64 di_lsn; /* flush sequence */
884 __be64 di_flags2; /* more random flags */
885 __be32 di_cowextsize; /* basic cow extent size for file */
886 __u8 di_pad2[12]; /* more padding for future expansion */
887
888 /* fields only written to during inode creation */
889 xfs_timestamp_t di_crtime; /* time created */
890 __be64 di_ino; /* inode number */
891 uuid_t di_uuid; /* UUID of the filesystem */
892
893 /* structure must be padded to 64 bit alignment */
894 } xfs_dinode_t;
895
896 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
897
898 #define DI_MAX_FLUSH 0xffff
899
900 /*
901 * Size of the core inode on disk. Version 1 and 2 inodes have
902 * the same size, but version 3 has grown a few additional fields.
903 */
904 static inline uint xfs_dinode_size(int version)
905 {
906 if (version == 3)
907 return sizeof(struct xfs_dinode);
908 return offsetof(struct xfs_dinode, di_crc);
909 }
910
911 /*
912 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
913 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
914 */
915 #define XFS_MAXLINK ((1U << 31) - 1U)
916
917 /*
918 * Values for di_format
919 */
920 typedef enum xfs_dinode_fmt {
921 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
922 XFS_DINODE_FMT_LOCAL, /* bulk data */
923 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
924 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
925 XFS_DINODE_FMT_UUID /* added long ago, but never used */
926 } xfs_dinode_fmt_t;
927
928 /*
929 * Inode minimum and maximum sizes.
930 */
931 #define XFS_DINODE_MIN_LOG 8
932 #define XFS_DINODE_MAX_LOG 11
933 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
934 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
935
936 /*
937 * Inode size for given fs.
938 */
939 #define XFS_LITINO(mp, version) \
940 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
941
942 /*
943 * Inode data & attribute fork sizes, per inode.
944 */
945 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
946 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
947
948 #define XFS_DFORK_DSIZE(dip,mp) \
949 (XFS_DFORK_Q(dip) ? \
950 XFS_DFORK_BOFF(dip) : \
951 XFS_LITINO(mp, (dip)->di_version))
952 #define XFS_DFORK_ASIZE(dip,mp) \
953 (XFS_DFORK_Q(dip) ? \
954 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
955 0)
956 #define XFS_DFORK_SIZE(dip,mp,w) \
957 ((w) == XFS_DATA_FORK ? \
958 XFS_DFORK_DSIZE(dip, mp) : \
959 XFS_DFORK_ASIZE(dip, mp))
960
961 #define XFS_DFORK_MAXEXT(dip, mp, w) \
962 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
963
964 /*
965 * Return pointers to the data or attribute forks.
966 */
967 #define XFS_DFORK_DPTR(dip) \
968 ((char *)dip + xfs_dinode_size(dip->di_version))
969 #define XFS_DFORK_APTR(dip) \
970 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
971 #define XFS_DFORK_PTR(dip,w) \
972 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
973
974 #define XFS_DFORK_FORMAT(dip,w) \
975 ((w) == XFS_DATA_FORK ? \
976 (dip)->di_format : \
977 (dip)->di_aformat)
978 #define XFS_DFORK_NEXTENTS(dip,w) \
979 ((w) == XFS_DATA_FORK ? \
980 be32_to_cpu((dip)->di_nextents) : \
981 be16_to_cpu((dip)->di_anextents))
982
983 /*
984 * For block and character special files the 32bit dev_t is stored at the
985 * beginning of the data fork.
986 */
987 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
988 {
989 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
990 }
991
992 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
993 {
994 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
995 }
996
997 /*
998 * Values for di_flags
999 */
1000 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1001 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1002 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1003 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1004 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1005 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1006 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1007 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1008 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1009 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1010 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1011 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1012 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1013 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1014 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1015 /* Do not use bit 15, di_flags is legacy and unchanging now */
1016
1017 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1018 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1019 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1020 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1021 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1022 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1023 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1024 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1025 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1026 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1027 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1028 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1029 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1030 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1031 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1032
1033 #define XFS_DIFLAG_ANY \
1034 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1035 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1036 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1037 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1038 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1039
1040 /*
1041 * Values for di_flags2 These start by being exposed to userspace in the upper
1042 * 16 bits of the XFS_XFLAG_s range.
1043 */
1044 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1045 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1046 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1047 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1048 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1049 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1050
1051 #define XFS_DIFLAG2_ANY \
1052 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
1053
1054 /*
1055 * Inode number format:
1056 * low inopblog bits - offset in block
1057 * next agblklog bits - block number in ag
1058 * next agno_log bits - ag number
1059 * high agno_log-agblklog-inopblog bits - 0
1060 */
1061 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1062 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1063 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1064 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
1065 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1066 #define XFS_INO_BITS(mp) \
1067 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1068 #define XFS_INO_TO_AGNO(mp,i) \
1069 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1070 #define XFS_INO_TO_AGINO(mp,i) \
1071 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1072 #define XFS_INO_TO_AGBNO(mp,i) \
1073 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1074 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1075 #define XFS_INO_TO_OFFSET(mp,i) \
1076 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1077 #define XFS_INO_TO_FSB(mp,i) \
1078 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1079 #define XFS_AGINO_TO_INO(mp,a,i) \
1080 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1081 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1082 #define XFS_AGINO_TO_OFFSET(mp,i) \
1083 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1084 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1085 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1086
1087 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1088 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1089
1090 /*
1091 * RealTime Device format definitions
1092 */
1093
1094 /* Min and max rt extent sizes, specified in bytes */
1095 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1096 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1097 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1098
1099 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
1100 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
1101 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
1102 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
1103
1104 /*
1105 * RT Summary and bit manipulation macros.
1106 */
1107 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1108 #define XFS_SUMOFFSTOBLOCK(mp,s) \
1109 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1110 #define XFS_SUMPTR(mp,bp,so) \
1111 ((xfs_suminfo_t *)((bp)->b_addr + \
1112 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1113
1114 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
1115 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
1116 #define XFS_BITTOWORD(mp,bi) \
1117 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1118
1119 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
1120 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
1121
1122 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
1123 #define XFS_RTHIBIT(w) xfs_highbit32(w)
1124
1125 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
1126
1127 /*
1128 * Dquot and dquot block format definitions
1129 */
1130 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1131 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1132
1133 /*
1134 * This is the main portion of the on-disk representation of quota
1135 * information for a user. This is the q_core of the xfs_dquot_t that
1136 * is kept in kernel memory. We pad this with some more expansion room
1137 * to construct the on disk structure.
1138 */
1139 typedef struct xfs_disk_dquot {
1140 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1141 __u8 d_version; /* dquot version */
1142 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
1143 __be32 d_id; /* user,project,group id */
1144 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1145 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1146 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1147 __be64 d_ino_softlimit;/* preferred inode limit */
1148 __be64 d_bcount; /* disk blocks owned by the user */
1149 __be64 d_icount; /* inodes owned by the user */
1150 __be32 d_itimer; /* zero if within inode limits if not,
1151 this is when we refuse service */
1152 __be32 d_btimer; /* similar to above; for disk blocks */
1153 __be16 d_iwarns; /* warnings issued wrt num inodes */
1154 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1155 __be32 d_pad0; /* 64 bit align */
1156 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1157 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1158 __be64 d_rtbcount; /* realtime blocks owned */
1159 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1160 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1161 __be16 d_pad;
1162 } xfs_disk_dquot_t;
1163
1164 /*
1165 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1166 * carrying the unnecessary padding would be a waste of memory.
1167 */
1168 typedef struct xfs_dqblk {
1169 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */
1170 char dd_fill[4]; /* filling for posterity */
1171
1172 /*
1173 * These two are only present on filesystems with the CRC bits set.
1174 */
1175 __be32 dd_crc; /* checksum */
1176 __be64 dd_lsn; /* last modification in log */
1177 uuid_t dd_uuid; /* location information */
1178 } xfs_dqblk_t;
1179
1180 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1181
1182 /*
1183 * Remote symlink format and access functions.
1184 */
1185 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1186
1187 struct xfs_dsymlink_hdr {
1188 __be32 sl_magic;
1189 __be32 sl_offset;
1190 __be32 sl_bytes;
1191 __be32 sl_crc;
1192 uuid_t sl_uuid;
1193 __be64 sl_owner;
1194 __be64 sl_blkno;
1195 __be64 sl_lsn;
1196 };
1197
1198 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1199
1200 #define XFS_SYMLINK_MAXLEN 1024
1201 /*
1202 * The maximum pathlen is 1024 bytes. Since the minimum file system
1203 * blocksize is 512 bytes, we can get a max of 3 extents back from
1204 * bmapi when crc headers are taken into account.
1205 */
1206 #define XFS_SYMLINK_MAPS 3
1207
1208 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1209 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1210 sizeof(struct xfs_dsymlink_hdr) : 0))
1211
1212
1213 /*
1214 * Allocation Btree format definitions
1215 *
1216 * There are two on-disk btrees, one sorted by blockno and one sorted
1217 * by blockcount and blockno. All blocks look the same to make the code
1218 * simpler; if we have time later, we'll make the optimizations.
1219 */
1220 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1221 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1222 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1223 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1224
1225 /*
1226 * Data record/key structure
1227 */
1228 typedef struct xfs_alloc_rec {
1229 __be32 ar_startblock; /* starting block number */
1230 __be32 ar_blockcount; /* count of free blocks */
1231 } xfs_alloc_rec_t, xfs_alloc_key_t;
1232
1233 typedef struct xfs_alloc_rec_incore {
1234 xfs_agblock_t ar_startblock; /* starting block number */
1235 xfs_extlen_t ar_blockcount; /* count of free blocks */
1236 } xfs_alloc_rec_incore_t;
1237
1238 /* btree pointer type */
1239 typedef __be32 xfs_alloc_ptr_t;
1240
1241 /*
1242 * Block numbers in the AG:
1243 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1244 */
1245 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1246 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1247
1248
1249 /*
1250 * Inode Allocation Btree format definitions
1251 *
1252 * There is a btree for the inode map per allocation group.
1253 */
1254 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1255 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1256 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1257 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1258
1259 typedef uint64_t xfs_inofree_t;
1260 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1261 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1262 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1263 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1264
1265 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1266 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1267 #define XFS_INODES_PER_HOLEMASK_BIT \
1268 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1269
1270 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1271 {
1272 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1273 }
1274
1275 /*
1276 * The on-disk inode record structure has two formats. The original "full"
1277 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1278 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1279 * count.
1280 *
1281 * The holemask of the sparse record format allows an inode chunk to have holes
1282 * that refer to blocks not owned by the inode record. This facilitates inode
1283 * allocation in the event of severe free space fragmentation.
1284 */
1285 typedef struct xfs_inobt_rec {
1286 __be32 ir_startino; /* starting inode number */
1287 union {
1288 struct {
1289 __be32 ir_freecount; /* count of free inodes */
1290 } f;
1291 struct {
1292 __be16 ir_holemask;/* hole mask for sparse chunks */
1293 __u8 ir_count; /* total inode count */
1294 __u8 ir_freecount; /* count of free inodes */
1295 } sp;
1296 } ir_u;
1297 __be64 ir_free; /* free inode mask */
1298 } xfs_inobt_rec_t;
1299
1300 typedef struct xfs_inobt_rec_incore {
1301 xfs_agino_t ir_startino; /* starting inode number */
1302 uint16_t ir_holemask; /* hole mask for sparse chunks */
1303 uint8_t ir_count; /* total inode count */
1304 uint8_t ir_freecount; /* count of free inodes (set bits) */
1305 xfs_inofree_t ir_free; /* free inode mask */
1306 } xfs_inobt_rec_incore_t;
1307
1308 static inline bool xfs_inobt_issparse(uint16_t holemask)
1309 {
1310 /* non-zero holemask represents a sparse rec. */
1311 return holemask;
1312 }
1313
1314 /*
1315 * Key structure
1316 */
1317 typedef struct xfs_inobt_key {
1318 __be32 ir_startino; /* starting inode number */
1319 } xfs_inobt_key_t;
1320
1321 /* btree pointer type */
1322 typedef __be32 xfs_inobt_ptr_t;
1323
1324 /*
1325 * block numbers in the AG.
1326 */
1327 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1328 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1329
1330 /*
1331 * Reverse mapping btree format definitions
1332 *
1333 * There is a btree for the reverse map per allocation group
1334 */
1335 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1336
1337 /*
1338 * Ownership info for an extent. This is used to create reverse-mapping
1339 * entries.
1340 */
1341 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1342 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1343 struct xfs_owner_info {
1344 uint64_t oi_owner;
1345 xfs_fileoff_t oi_offset;
1346 unsigned int oi_flags;
1347 };
1348
1349 /*
1350 * Special owner types.
1351 *
1352 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1353 * to tell us we have a special owner value. We use these for static metadata
1354 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1355 */
1356 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1357 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1358 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1359 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1360 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1361 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1362 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1363 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1364 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1365 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1366
1367 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1368
1369 /*
1370 * Data record structure
1371 */
1372 struct xfs_rmap_rec {
1373 __be32 rm_startblock; /* extent start block */
1374 __be32 rm_blockcount; /* extent length */
1375 __be64 rm_owner; /* extent owner */
1376 __be64 rm_offset; /* offset within the owner */
1377 };
1378
1379 /*
1380 * rmap btree record
1381 * rm_offset:63 is the attribute fork flag
1382 * rm_offset:62 is the bmbt block flag
1383 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1384 * rm_offset:54-60 aren't used and should be zero
1385 * rm_offset:0-53 is the block offset within the inode
1386 */
1387 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1388 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1389 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1390
1391 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1392 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1393 XFS_RMAP_OFF_BMBT_BLOCK | \
1394 XFS_RMAP_OFF_UNWRITTEN)
1395 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1396
1397 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1398
1399 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1400 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1401 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1402
1403 #define RMAPBT_STARTBLOCK_BITLEN 32
1404 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1405 #define RMAPBT_OWNER_BITLEN 64
1406 #define RMAPBT_ATTRFLAG_BITLEN 1
1407 #define RMAPBT_BMBTFLAG_BITLEN 1
1408 #define RMAPBT_EXNTFLAG_BITLEN 1
1409 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1410 #define RMAPBT_OFFSET_BITLEN 54
1411
1412 #define XFS_RMAP_ATTR_FORK (1 << 0)
1413 #define XFS_RMAP_BMBT_BLOCK (1 << 1)
1414 #define XFS_RMAP_UNWRITTEN (1 << 2)
1415 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \
1416 XFS_RMAP_BMBT_BLOCK)
1417 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN)
1418 struct xfs_rmap_irec {
1419 xfs_agblock_t rm_startblock; /* extent start block */
1420 xfs_extlen_t rm_blockcount; /* extent length */
1421 uint64_t rm_owner; /* extent owner */
1422 uint64_t rm_offset; /* offset within the owner */
1423 unsigned int rm_flags; /* state flags */
1424 };
1425
1426 /*
1427 * Key structure
1428 *
1429 * We don't use the length for lookups
1430 */
1431 struct xfs_rmap_key {
1432 __be32 rm_startblock; /* extent start block */
1433 __be64 rm_owner; /* extent owner */
1434 __be64 rm_offset; /* offset within the owner */
1435 } __attribute__((packed));
1436
1437 /* btree pointer type */
1438 typedef __be32 xfs_rmap_ptr_t;
1439
1440 #define XFS_RMAP_BLOCK(mp) \
1441 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1442 XFS_FIBT_BLOCK(mp) + 1 : \
1443 XFS_IBT_BLOCK(mp) + 1)
1444
1445 /*
1446 * Reference Count Btree format definitions
1447 *
1448 */
1449 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1450
1451 unsigned int xfs_refc_block(struct xfs_mount *mp);
1452
1453 /*
1454 * Data record/key structure
1455 *
1456 * Each record associates a range of physical blocks (starting at
1457 * rc_startblock and ending rc_blockcount blocks later) with a reference
1458 * count (rc_refcount). Extents that are being used to stage a copy on
1459 * write (CoW) operation are recorded in the refcount btree with a
1460 * refcount of 1. All other records must have a refcount > 1 and must
1461 * track an extent mapped only by file data forks.
1462 *
1463 * Extents with a single owner (attributes, metadata, non-shared file
1464 * data) are not tracked here. Free space is also not tracked here.
1465 * This is consistent with pre-reflink XFS.
1466 */
1467
1468 /*
1469 * Extents that are being used to stage a copy on write are stored
1470 * in the refcount btree with a refcount of 1 and the upper bit set
1471 * on the startblock. This speeds up mount time deletion of stale
1472 * staging extents because they're all at the right side of the tree.
1473 */
1474 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31))
1475 #define REFCNTBT_COWFLAG_BITLEN 1
1476 #define REFCNTBT_AGBLOCK_BITLEN 31
1477
1478 struct xfs_refcount_rec {
1479 __be32 rc_startblock; /* starting block number */
1480 __be32 rc_blockcount; /* count of blocks */
1481 __be32 rc_refcount; /* number of inodes linked here */
1482 };
1483
1484 struct xfs_refcount_key {
1485 __be32 rc_startblock; /* starting block number */
1486 };
1487
1488 struct xfs_refcount_irec {
1489 xfs_agblock_t rc_startblock; /* starting block number */
1490 xfs_extlen_t rc_blockcount; /* count of free blocks */
1491 xfs_nlink_t rc_refcount; /* number of inodes linked here */
1492 };
1493
1494 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1495 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1496
1497 /* btree pointer type */
1498 typedef __be32 xfs_refcount_ptr_t;
1499
1500
1501 /*
1502 * BMAP Btree format definitions
1503 *
1504 * This includes both the root block definition that sits inside an inode fork
1505 * and the record/pointer formats for the leaf/node in the blocks.
1506 */
1507 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1508 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1509
1510 /*
1511 * Bmap root header, on-disk form only.
1512 */
1513 typedef struct xfs_bmdr_block {
1514 __be16 bb_level; /* 0 is a leaf */
1515 __be16 bb_numrecs; /* current # of data records */
1516 } xfs_bmdr_block_t;
1517
1518 /*
1519 * Bmap btree record and extent descriptor.
1520 * l0:63 is an extent flag (value 1 indicates non-normal).
1521 * l0:9-62 are startoff.
1522 * l0:0-8 and l1:21-63 are startblock.
1523 * l1:0-20 are blockcount.
1524 */
1525 #define BMBT_EXNTFLAG_BITLEN 1
1526 #define BMBT_STARTOFF_BITLEN 54
1527 #define BMBT_STARTBLOCK_BITLEN 52
1528 #define BMBT_BLOCKCOUNT_BITLEN 21
1529
1530 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
1531
1532 typedef struct xfs_bmbt_rec {
1533 __be64 l0, l1;
1534 } xfs_bmbt_rec_t;
1535
1536 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1537 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1538
1539 /*
1540 * Values and macros for delayed-allocation startblock fields.
1541 */
1542 #define STARTBLOCKVALBITS 17
1543 #define STARTBLOCKMASKBITS (15 + 20)
1544 #define STARTBLOCKMASK \
1545 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1546
1547 static inline int isnullstartblock(xfs_fsblock_t x)
1548 {
1549 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1550 }
1551
1552 static inline xfs_fsblock_t nullstartblock(int k)
1553 {
1554 ASSERT(k < (1 << STARTBLOCKVALBITS));
1555 return STARTBLOCKMASK | (k);
1556 }
1557
1558 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1559 {
1560 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1561 }
1562
1563 /*
1564 * Key structure for non-leaf levels of the tree.
1565 */
1566 typedef struct xfs_bmbt_key {
1567 __be64 br_startoff; /* starting file offset */
1568 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1569
1570 /* btree pointer type */
1571 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1572
1573
1574 /*
1575 * Generic Btree block format definitions
1576 *
1577 * This is a combination of the actual format used on disk for short and long
1578 * format btrees. The first three fields are shared by both format, but the
1579 * pointers are different and should be used with care.
1580 *
1581 * To get the size of the actual short or long form headers please use the size
1582 * macros below. Never use sizeof(xfs_btree_block).
1583 *
1584 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1585 * with the crc feature bit, and all accesses to them must be conditional on
1586 * that flag.
1587 */
1588 /* short form block header */
1589 struct xfs_btree_block_shdr {
1590 __be32 bb_leftsib;
1591 __be32 bb_rightsib;
1592
1593 __be64 bb_blkno;
1594 __be64 bb_lsn;
1595 uuid_t bb_uuid;
1596 __be32 bb_owner;
1597 __le32 bb_crc;
1598 };
1599
1600 /* long form block header */
1601 struct xfs_btree_block_lhdr {
1602 __be64 bb_leftsib;
1603 __be64 bb_rightsib;
1604
1605 __be64 bb_blkno;
1606 __be64 bb_lsn;
1607 uuid_t bb_uuid;
1608 __be64 bb_owner;
1609 __le32 bb_crc;
1610 __be32 bb_pad; /* padding for alignment */
1611 };
1612
1613 struct xfs_btree_block {
1614 __be32 bb_magic; /* magic number for block type */
1615 __be16 bb_level; /* 0 is a leaf */
1616 __be16 bb_numrecs; /* current # of data records */
1617 union {
1618 struct xfs_btree_block_shdr s;
1619 struct xfs_btree_block_lhdr l;
1620 } bb_u; /* rest */
1621 };
1622
1623 /* size of a short form block */
1624 #define XFS_BTREE_SBLOCK_LEN \
1625 (offsetof(struct xfs_btree_block, bb_u) + \
1626 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1627 /* size of a long form block */
1628 #define XFS_BTREE_LBLOCK_LEN \
1629 (offsetof(struct xfs_btree_block, bb_u) + \
1630 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1631
1632 /* sizes of CRC enabled btree blocks */
1633 #define XFS_BTREE_SBLOCK_CRC_LEN \
1634 (offsetof(struct xfs_btree_block, bb_u) + \
1635 sizeof(struct xfs_btree_block_shdr))
1636 #define XFS_BTREE_LBLOCK_CRC_LEN \
1637 (offsetof(struct xfs_btree_block, bb_u) + \
1638 sizeof(struct xfs_btree_block_lhdr))
1639
1640 #define XFS_BTREE_SBLOCK_CRC_OFF \
1641 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1642 #define XFS_BTREE_LBLOCK_CRC_OFF \
1643 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1644
1645 /*
1646 * On-disk XFS access control list structure.
1647 */
1648 struct xfs_acl_entry {
1649 __be32 ae_tag;
1650 __be32 ae_id;
1651 __be16 ae_perm;
1652 __be16 ae_pad; /* fill the implicit hole in the structure */
1653 };
1654
1655 struct xfs_acl {
1656 __be32 acl_cnt;
1657 struct xfs_acl_entry acl_entry[0];
1658 };
1659
1660 /*
1661 * The number of ACL entries allowed is defined by the on-disk format.
1662 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1663 * limited only by the maximum size of the xattr that stores the information.
1664 */
1665 #define XFS_ACL_MAX_ENTRIES(mp) \
1666 (xfs_sb_version_hascrc(&mp->m_sb) \
1667 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1668 sizeof(struct xfs_acl_entry) \
1669 : 25)
1670
1671 #define XFS_ACL_SIZE(cnt) \
1672 (sizeof(struct xfs_acl) + \
1673 sizeof(struct xfs_acl_entry) * cnt)
1674
1675 #define XFS_ACL_MAX_SIZE(mp) \
1676 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1677
1678
1679 /* On-disk XFS extended attribute names */
1680 #define SGI_ACL_FILE "SGI_ACL_FILE"
1681 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1682 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1683 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1684
1685 #endif /* __XFS_FORMAT_H__ */
Unnamed repository; edit this file 'description' to name the repository.