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_rtbxlen_t sb_rextents; /* number of realtime extents */
102 uuid_t sb_uuid; /* user-visible file system unique id */
103 xfs_fsblock_t sb_logstart; /* starting block of log if internal */
104 xfs_ino_t sb_rootino; /* root inode number */
105 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
106 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
107 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
108 xfs_agblock_t sb_agblocks; /* size of an allocation group */
109 xfs_agnumber_t sb_agcount; /* number of allocation groups */
110 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
111 xfs_extlen_t sb_logblocks; /* number of log blocks */
112 uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
113 uint16_t sb_sectsize; /* volume sector size, bytes */
114 uint16_t sb_inodesize; /* inode size, bytes */
115 uint16_t sb_inopblock; /* inodes per block */
116 char sb_fname[XFSLABEL_MAX]; /* file system name */
117 uint8_t sb_blocklog; /* log2 of sb_blocksize */
118 uint8_t sb_sectlog; /* log2 of sb_sectsize */
119 uint8_t sb_inodelog; /* log2 of sb_inodesize */
120 uint8_t sb_inopblog; /* log2 of sb_inopblock */
121 uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
122 uint8_t sb_rextslog; /* log2 of sb_rextents */
123 uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
124 uint8_t sb_imax_pct; /* max % of fs for inode space */
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 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 };
267
268 /*
269 * Misc. Flags - warning - these will be cleared by xfs_repair unless
270 * a feature bit is set when the flag is used.
271 */
272 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
273 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
274
275 /*
276 * define max. shared version we can interoperate with
277 */
278 #define XFS_SB_MAX_SHARED_VN 0
279
280 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
281
xfs_sb_is_v5(struct xfs_sb * sbp)282 static inline bool xfs_sb_is_v5(struct xfs_sb *sbp)
283 {
284 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
285 }
286
287 /*
288 * Detect a mismatched features2 field. Older kernels read/wrote
289 * this into the wrong slot, so to be safe we keep them in sync.
290 */
xfs_sb_has_mismatched_features2(struct xfs_sb * sbp)291 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
292 {
293 return sbp->sb_bad_features2 != sbp->sb_features2;
294 }
295
xfs_sb_version_hasmorebits(struct xfs_sb * sbp)296 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
297 {
298 return xfs_sb_is_v5(sbp) ||
299 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
300 }
301
xfs_sb_version_addattr(struct xfs_sb * sbp)302 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
303 {
304 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
305 }
306
xfs_sb_version_addquota(struct xfs_sb * sbp)307 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
308 {
309 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
310 }
311
xfs_sb_version_addattr2(struct xfs_sb * sbp)312 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
313 {
314 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
315 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
316 }
317
xfs_sb_version_addprojid32(struct xfs_sb * sbp)318 static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp)
319 {
320 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
321 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
322 }
323
324 /*
325 * Extended v5 superblock feature masks. These are to be used for new v5
326 * superblock features only.
327 *
328 * Compat features are new features that old kernels will not notice or affect
329 * and so can mount read-write without issues.
330 *
331 * RO-Compat (read only) are features that old kernels can read but will break
332 * if they write. Hence only read-only mounts of such filesystems are allowed on
333 * kernels that don't support the feature bit.
334 *
335 * InCompat features are features which old kernels will not understand and so
336 * must not mount.
337 *
338 * Log-InCompat features are for changes to log formats or new transactions that
339 * can't be replayed on older kernels. The fields are set when the filesystem is
340 * mounted, and a clean unmount clears the fields.
341 */
342 #define XFS_SB_FEAT_COMPAT_ALL 0
343 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
344 static inline bool
xfs_sb_has_compat_feature(struct xfs_sb * sbp,uint32_t feature)345 xfs_sb_has_compat_feature(
346 struct xfs_sb *sbp,
347 uint32_t feature)
348 {
349 return (sbp->sb_features_compat & feature) != 0;
350 }
351
352 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
353 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
354 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
355 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */
356 #define XFS_SB_FEAT_RO_COMPAT_ALL \
357 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
358 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
359 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
360 XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
361 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
362 static inline bool
xfs_sb_has_ro_compat_feature(struct xfs_sb * sbp,uint32_t feature)363 xfs_sb_has_ro_compat_feature(
364 struct xfs_sb *sbp,
365 uint32_t feature)
366 {
367 return (sbp->sb_features_ro_compat & feature) != 0;
368 }
369
370 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
371 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
372 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
373 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */
374 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */
375 #define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */
376 #define XFS_SB_FEAT_INCOMPAT_EXCHRANGE (1 << 6) /* exchangerange supported */
377 #define XFS_SB_FEAT_INCOMPAT_PARENT (1 << 7) /* parent pointers */
378 #define XFS_SB_FEAT_INCOMPAT_ALL \
379 (XFS_SB_FEAT_INCOMPAT_FTYPE | \
380 XFS_SB_FEAT_INCOMPAT_SPINODES | \
381 XFS_SB_FEAT_INCOMPAT_META_UUID | \
382 XFS_SB_FEAT_INCOMPAT_BIGTIME | \
383 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR | \
384 XFS_SB_FEAT_INCOMPAT_NREXT64 | \
385 XFS_SB_FEAT_INCOMPAT_EXCHRANGE | \
386 XFS_SB_FEAT_INCOMPAT_PARENT)
387
388 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
389 static inline bool
xfs_sb_has_incompat_feature(struct xfs_sb * sbp,uint32_t feature)390 xfs_sb_has_incompat_feature(
391 struct xfs_sb *sbp,
392 uint32_t feature)
393 {
394 return (sbp->sb_features_incompat & feature) != 0;
395 }
396
397 #define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
398 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
399 (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
400 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
401 static inline bool
xfs_sb_has_incompat_log_feature(struct xfs_sb * sbp,uint32_t feature)402 xfs_sb_has_incompat_log_feature(
403 struct xfs_sb *sbp,
404 uint32_t feature)
405 {
406 return (sbp->sb_features_log_incompat & feature) != 0;
407 }
408
409 static inline void
xfs_sb_remove_incompat_log_features(struct xfs_sb * sbp)410 xfs_sb_remove_incompat_log_features(
411 struct xfs_sb *sbp)
412 {
413 sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
414 }
415
416 static inline void
xfs_sb_add_incompat_log_features(struct xfs_sb * sbp,unsigned int features)417 xfs_sb_add_incompat_log_features(
418 struct xfs_sb *sbp,
419 unsigned int features)
420 {
421 sbp->sb_features_log_incompat |= features;
422 }
423
xfs_sb_version_haslogxattrs(struct xfs_sb * sbp)424 static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
425 {
426 return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
427 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
428 }
429
430 static inline bool
xfs_is_quota_inode(struct xfs_sb * sbp,xfs_ino_t ino)431 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
432 {
433 return (ino == sbp->sb_uquotino ||
434 ino == sbp->sb_gquotino ||
435 ino == sbp->sb_pquotino);
436 }
437
438 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
439 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
440
441 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
442 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
443 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
444 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
445 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
446
447 /*
448 * File system sector to basic block conversions.
449 */
450 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
451
452 /*
453 * File system block to basic block conversions.
454 */
455 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
456 #define XFS_BB_TO_FSB(mp,bb) \
457 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
458 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
459
460 /*
461 * File system block to byte conversions.
462 */
463 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
464 #define XFS_B_TO_FSB(mp,b) \
465 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
466 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
467
468 /*
469 * Allocation group header
470 *
471 * This is divided into three structures, placed in sequential 512-byte
472 * buffers after a copy of the superblock (also in a 512-byte buffer).
473 */
474 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
475 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
476 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
477 #define XFS_AGF_VERSION 1
478 #define XFS_AGI_VERSION 1
479
480 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
481 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
482
483 /*
484 * agf_cnt_level in the first AGF overlaps the EFS superblock's magic number.
485 * Since the magic numbers valid for EFS are > 64k, our value cannot be confused
486 * for an EFS superblock.
487 */
488
489 typedef struct xfs_agf {
490 /*
491 * Common allocation group header information
492 */
493 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
494 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
495 __be32 agf_seqno; /* sequence # starting from 0 */
496 __be32 agf_length; /* size in blocks of a.g. */
497 /*
498 * Freespace and rmap information
499 */
500 __be32 agf_bno_root; /* bnobt root block */
501 __be32 agf_cnt_root; /* cntbt root block */
502 __be32 agf_rmap_root; /* rmapbt root block */
503
504 __be32 agf_bno_level; /* bnobt btree levels */
505 __be32 agf_cnt_level; /* cntbt btree levels */
506 __be32 agf_rmap_level; /* rmapbt btree levels */
507
508 __be32 agf_flfirst; /* first freelist block's index */
509 __be32 agf_fllast; /* last freelist block's index */
510 __be32 agf_flcount; /* count of blocks in freelist */
511 __be32 agf_freeblks; /* total free blocks */
512
513 __be32 agf_longest; /* longest free space */
514 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
515 uuid_t agf_uuid; /* uuid of filesystem */
516
517 __be32 agf_rmap_blocks; /* rmapbt blocks used */
518 __be32 agf_refcount_blocks; /* refcountbt blocks used */
519
520 __be32 agf_refcount_root; /* refcount tree root block */
521 __be32 agf_refcount_level; /* refcount btree levels */
522
523 /*
524 * reserve some contiguous space for future logged fields before we add
525 * the unlogged fields. This makes the range logging via flags and
526 * structure offsets much simpler.
527 */
528 __be64 agf_spare64[14];
529
530 /* unlogged fields, written during buffer writeback. */
531 __be64 agf_lsn; /* last write sequence */
532 __be32 agf_crc; /* crc of agf sector */
533 __be32 agf_spare2;
534
535 /* structure must be padded to 64 bit alignment */
536 } xfs_agf_t;
537
538 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
539
540 #define XFS_AGF_MAGICNUM (1u << 0)
541 #define XFS_AGF_VERSIONNUM (1u << 1)
542 #define XFS_AGF_SEQNO (1u << 2)
543 #define XFS_AGF_LENGTH (1u << 3)
544 #define XFS_AGF_ROOTS (1u << 4)
545 #define XFS_AGF_LEVELS (1u << 5)
546 #define XFS_AGF_FLFIRST (1u << 6)
547 #define XFS_AGF_FLLAST (1u << 7)
548 #define XFS_AGF_FLCOUNT (1u << 8)
549 #define XFS_AGF_FREEBLKS (1u << 9)
550 #define XFS_AGF_LONGEST (1u << 10)
551 #define XFS_AGF_BTREEBLKS (1u << 11)
552 #define XFS_AGF_UUID (1u << 12)
553 #define XFS_AGF_RMAP_BLOCKS (1u << 13)
554 #define XFS_AGF_REFCOUNT_BLOCKS (1u << 14)
555 #define XFS_AGF_REFCOUNT_ROOT (1u << 15)
556 #define XFS_AGF_REFCOUNT_LEVEL (1u << 16)
557 #define XFS_AGF_SPARE64 (1u << 17)
558 #define XFS_AGF_NUM_BITS 18
559 #define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1)
560
561 #define XFS_AGF_FLAGS \
562 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \
563 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
564 { XFS_AGF_SEQNO, "SEQNO" }, \
565 { XFS_AGF_LENGTH, "LENGTH" }, \
566 { XFS_AGF_ROOTS, "ROOTS" }, \
567 { XFS_AGF_LEVELS, "LEVELS" }, \
568 { XFS_AGF_FLFIRST, "FLFIRST" }, \
569 { XFS_AGF_FLLAST, "FLLAST" }, \
570 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \
571 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \
572 { XFS_AGF_LONGEST, "LONGEST" }, \
573 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
574 { XFS_AGF_UUID, "UUID" }, \
575 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
576 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
577 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
578 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
579 { XFS_AGF_SPARE64, "SPARE64" }
580
581 /* disk block (xfs_daddr_t) in the AG */
582 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
583 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
584
585 /*
586 * Size of the unlinked inode hash table in the agi.
587 */
588 #define XFS_AGI_UNLINKED_BUCKETS 64
589
590 typedef struct xfs_agi {
591 /*
592 * Common allocation group header information
593 */
594 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
595 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
596 __be32 agi_seqno; /* sequence # starting from 0 */
597 __be32 agi_length; /* size in blocks of a.g. */
598 /*
599 * Inode information
600 * Inodes are mapped by interpreting the inode number, so no
601 * mapping data is needed here.
602 */
603 __be32 agi_count; /* count of allocated inodes */
604 __be32 agi_root; /* root of inode btree */
605 __be32 agi_level; /* levels in inode btree */
606 __be32 agi_freecount; /* number of free inodes */
607
608 __be32 agi_newino; /* new inode just allocated */
609 __be32 agi_dirino; /* last directory inode chunk */
610 /*
611 * Hash table of inodes which have been unlinked but are
612 * still being referenced.
613 */
614 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
615 /*
616 * This marks the end of logging region 1 and start of logging region 2.
617 */
618 uuid_t agi_uuid; /* uuid of filesystem */
619 __be32 agi_crc; /* crc of agi sector */
620 __be32 agi_pad32;
621 __be64 agi_lsn; /* last write sequence */
622
623 __be32 agi_free_root; /* root of the free inode btree */
624 __be32 agi_free_level;/* levels in free inode btree */
625
626 __be32 agi_iblocks; /* inobt blocks used */
627 __be32 agi_fblocks; /* finobt blocks used */
628
629 /* structure must be padded to 64 bit alignment */
630 } xfs_agi_t;
631
632 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
633
634 #define XFS_AGI_MAGICNUM (1u << 0)
635 #define XFS_AGI_VERSIONNUM (1u << 1)
636 #define XFS_AGI_SEQNO (1u << 2)
637 #define XFS_AGI_LENGTH (1u << 3)
638 #define XFS_AGI_COUNT (1u << 4)
639 #define XFS_AGI_ROOT (1u << 5)
640 #define XFS_AGI_LEVEL (1u << 6)
641 #define XFS_AGI_FREECOUNT (1u << 7)
642 #define XFS_AGI_NEWINO (1u << 8)
643 #define XFS_AGI_DIRINO (1u << 9)
644 #define XFS_AGI_UNLINKED (1u << 10)
645 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
646 #define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1)
647 #define XFS_AGI_FREE_ROOT (1u << 11)
648 #define XFS_AGI_FREE_LEVEL (1u << 12)
649 #define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */
650 #define XFS_AGI_NUM_BITS_R2 14
651
652 /* disk block (xfs_daddr_t) in the AG */
653 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
654 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
655
656 /*
657 * The third a.g. block contains the a.g. freelist, an array
658 * of block pointers to blocks owned by the allocation btree code.
659 */
660 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
661 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
662 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr))
663
664 struct xfs_agfl {
665 __be32 agfl_magicnum;
666 __be32 agfl_seqno;
667 uuid_t agfl_uuid;
668 __be64 agfl_lsn;
669 __be32 agfl_crc;
670 } __attribute__((packed));
671
672 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
673
674 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
675 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
676 #define XFS_FSB_TO_AGNO(mp,fsbno) \
677 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
678 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
679 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
680 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
681 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
682 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
683 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
684
685 /*
686 * For checking for bad ranges of xfs_daddr_t's, covering multiple
687 * allocation groups or a single xfs_daddr_t that's a superblock copy.
688 */
689 #define XFS_AG_CHECK_DADDR(mp,d,len) \
690 ((len) == 1 ? \
691 ASSERT((d) == XFS_SB_DADDR || \
692 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
693 ASSERT(xfs_daddr_to_agno(mp, d) == \
694 xfs_daddr_to_agno(mp, (d) + (len) - 1)))
695
696 /*
697 * Realtime bitmap information is accessed by the word, which is currently
698 * stored in host-endian format.
699 */
700 union xfs_rtword_raw {
701 __u32 old;
702 };
703
704 /*
705 * Realtime summary counts are accessed by the word, which is currently
706 * stored in host-endian format.
707 */
708 union xfs_suminfo_raw {
709 __u32 old;
710 };
711
712 /*
713 * XFS Timestamps
714 * ==============
715 *
716 * Traditional ondisk inode timestamps consist of signed 32-bit counters for
717 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
718 * 1970, which means that the timestamp epoch is the same as the Unix epoch.
719 * Therefore, the ondisk min and max defined here can be used directly to
720 * constrain the incore timestamps on a Unix system. Note that we actually
721 * encode a __be64 value on disk.
722 *
723 * When the bigtime feature is enabled, ondisk inode timestamps become an
724 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode
725 * timestamp epoch is the start of the classic timestamp range, which is
726 * Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers
727 * /must/ use the bigtime conversion functions when encoding and decoding raw
728 * timestamps.
729 */
730 typedef __be64 xfs_timestamp_t;
731
732 /* Legacy timestamp encoding format. */
733 struct xfs_legacy_timestamp {
734 __be32 t_sec; /* timestamp seconds */
735 __be32 t_nsec; /* timestamp nanoseconds */
736 };
737
738 /*
739 * Smallest possible ondisk seconds value with traditional timestamps. This
740 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
741 */
742 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
743
744 /*
745 * Largest possible ondisk seconds value with traditional timestamps. This
746 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
747 */
748 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
749
750 /*
751 * Smallest possible ondisk seconds value with bigtime timestamps. This
752 * corresponds (after conversion to a Unix timestamp) with the traditional
753 * minimum timestamp of Dec 13 20:45:52 UTC 1901.
754 */
755 #define XFS_BIGTIME_TIME_MIN ((int64_t)0)
756
757 /*
758 * Largest supported ondisk seconds value with bigtime timestamps. This
759 * corresponds (after conversion to a Unix timestamp) with an incore timestamp
760 * of Jul 2 20:20:24 UTC 2486.
761 *
762 * We round down the ondisk limit so that the bigtime quota and inode max
763 * timestamps will be the same.
764 */
765 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
766
767 /*
768 * Bigtime epoch is set exactly to the minimum time value that a traditional
769 * 32-bit timestamp can represent when using the Unix epoch as a reference.
770 * Hence the Unix epoch is at a fixed offset into the supported bigtime
771 * timestamp range.
772 *
773 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
774 * timestamp can represent so we will not lose any fidelity in converting
775 * to/from unix and bigtime timestamps.
776 *
777 * The following conversion factor converts a seconds counter from the Unix
778 * epoch to the bigtime epoch.
779 */
780 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN)
781
782 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */
xfs_unix_to_bigtime(time64_t unix_seconds)783 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds)
784 {
785 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET;
786 }
787
788 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */
xfs_bigtime_to_unix(uint64_t ondisk_seconds)789 static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds)
790 {
791 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET;
792 }
793
794 /*
795 * On-disk inode structure.
796 *
797 * This is just the header or "dinode core", the inode is expanded to fill a
798 * variable size the leftover area split into a data and an attribute fork.
799 * The format of the data and attribute fork depends on the format of the
800 * inode as indicated by di_format and di_aformat. To access the data and
801 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
802 * below.
803 *
804 * There is a very similar struct xfs_log_dinode which matches the layout of
805 * this structure, but is kept in native format instead of big endian.
806 *
807 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
808 * padding field for v3 inodes.
809 */
810 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */
811 struct xfs_dinode {
812 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
813 __be16 di_mode; /* mode and type of file */
814 __u8 di_version; /* inode version */
815 __u8 di_format; /* format of di_c data */
816 __be16 di_onlink; /* old number of links to file */
817 __be32 di_uid; /* owner's user id */
818 __be32 di_gid; /* owner's group id */
819 __be32 di_nlink; /* number of links to file */
820 __be16 di_projid_lo; /* lower part of owner's project id */
821 __be16 di_projid_hi; /* higher part owner's project id */
822 union {
823 /* Number of data fork extents if NREXT64 is set */
824 __be64 di_big_nextents;
825
826 /* Padding for V3 inodes without NREXT64 set. */
827 __be64 di_v3_pad;
828
829 /* Padding and inode flush counter for V2 inodes. */
830 struct {
831 __u8 di_v2_pad[6];
832 __be16 di_flushiter;
833 };
834 };
835 xfs_timestamp_t di_atime; /* time last accessed */
836 xfs_timestamp_t di_mtime; /* time last modified */
837 xfs_timestamp_t di_ctime; /* time created/inode modified */
838 __be64 di_size; /* number of bytes in file */
839 __be64 di_nblocks; /* # of direct & btree blocks used */
840 __be32 di_extsize; /* basic/minimum extent size for file */
841 union {
842 /*
843 * For V2 inodes and V3 inodes without NREXT64 set, this
844 * is the number of data and attr fork extents.
845 */
846 struct {
847 __be32 di_nextents;
848 __be16 di_anextents;
849 } __packed;
850
851 /* Number of attr fork extents if NREXT64 is set. */
852 struct {
853 __be32 di_big_anextents;
854 __be16 di_nrext64_pad;
855 } __packed;
856 } __packed;
857 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
858 __s8 di_aformat; /* format of attr fork's data */
859 __be32 di_dmevmask; /* DMIG event mask */
860 __be16 di_dmstate; /* DMIG state info */
861 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
862 __be32 di_gen; /* generation number */
863
864 /* di_next_unlinked is the only non-core field in the old dinode */
865 __be32 di_next_unlinked;/* agi unlinked list ptr */
866
867 /* start of the extended dinode, writable fields */
868 __le32 di_crc; /* CRC of the inode */
869 __be64 di_changecount; /* number of attribute changes */
870 __be64 di_lsn; /* flush sequence */
871 __be64 di_flags2; /* more random flags */
872 __be32 di_cowextsize; /* basic cow extent size for file */
873 __u8 di_pad2[12]; /* more padding for future expansion */
874
875 /* fields only written to during inode creation */
876 xfs_timestamp_t di_crtime; /* time created */
877 __be64 di_ino; /* inode number */
878 uuid_t di_uuid; /* UUID of the filesystem */
879
880 /* structure must be padded to 64 bit alignment */
881 };
882
883 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
884
885 #define DI_MAX_FLUSH 0xffff
886
887 /*
888 * Size of the core inode on disk. Version 1 and 2 inodes have
889 * the same size, but version 3 has grown a few additional fields.
890 */
xfs_dinode_size(int version)891 static inline uint xfs_dinode_size(int version)
892 {
893 if (version == 3)
894 return sizeof(struct xfs_dinode);
895 return offsetof(struct xfs_dinode, di_crc);
896 }
897
898 /*
899 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
900 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
901 */
902 #define XFS_MAXLINK ((1U << 31) - 1U)
903
904 /*
905 * Any file that hits the maximum ondisk link count should be pinned to avoid
906 * a use-after-free situation.
907 */
908 #define XFS_NLINK_PINNED (~0U)
909
910 /*
911 * Values for di_format
912 *
913 * This enum is used in string mapping in xfs_trace.h; please keep the
914 * TRACE_DEFINE_ENUMs for it up to date.
915 */
916 enum xfs_dinode_fmt {
917 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
918 XFS_DINODE_FMT_LOCAL, /* bulk data */
919 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
920 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
921 XFS_DINODE_FMT_UUID /* added long ago, but never used */
922 };
923
924 #define XFS_INODE_FORMAT_STR \
925 { XFS_DINODE_FMT_DEV, "dev" }, \
926 { XFS_DINODE_FMT_LOCAL, "local" }, \
927 { XFS_DINODE_FMT_EXTENTS, "extent" }, \
928 { XFS_DINODE_FMT_BTREE, "btree" }, \
929 { XFS_DINODE_FMT_UUID, "uuid" }
930
931 /*
932 * Max values for extnum and aextnum.
933 *
934 * The original on-disk extent counts were held in signed fields, resulting in
935 * maximum extent counts of 2^31 and 2^15 for the data and attr forks
936 * respectively. Similarly the maximum extent length is limited to 2^21 blocks
937 * by the 21-bit wide blockcount field of a BMBT extent record.
938 *
939 * The newly introduced data fork extent counter can hold a 64-bit value,
940 * however the maximum number of extents in a file is also limited to 2^54
941 * extents by the 54-bit wide startoff field of a BMBT extent record.
942 *
943 * It is further limited by the maximum supported file size of 2^63
944 * *bytes*. This leads to a maximum extent count for maximally sized filesystem
945 * blocks (64kB) of:
946 *
947 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks
948 *
949 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence
950 * 2^48 was chosen as the maximum data fork extent count.
951 *
952 * The maximum file size that can be represented by the data fork extent counter
953 * in the worst case occurs when all extents are 1 block in length and each
954 * block is 1KB in size.
955 *
956 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and
957 * with 1KB sized blocks, a file can reach upto,
958 * 1KB * (2^31) = 2TB
959 *
960 * This is much larger than the theoretical maximum size of a directory
961 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB.
962 *
963 * Hence, a directory inode can never overflow its data fork extent counter.
964 */
965 #define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1))
966 #define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1))
967 #define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1))
968 #define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1))
969
970 /*
971 * When we upgrade an inode to the large extent counts, the maximum value by
972 * which the extent count can increase is bound by the change in size of the
973 * on-disk field. No upgrade operation should ever be adding more than a few
974 * tens of extents, so if we get a really large value it is a sign of a code bug
975 * or corruption.
976 */
977 #define XFS_MAX_EXTCNT_UPGRADE_NR \
978 min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \
979 XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL)
980
981 /*
982 * Inode minimum and maximum sizes.
983 */
984 #define XFS_DINODE_MIN_LOG 8
985 #define XFS_DINODE_MAX_LOG 11
986 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
987 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
988
989 /*
990 * Inode size for given fs.
991 */
992 #define XFS_DINODE_SIZE(mp) \
993 (xfs_has_v3inodes(mp) ? \
994 sizeof(struct xfs_dinode) : \
995 offsetof(struct xfs_dinode, di_crc))
996 #define XFS_LITINO(mp) \
997 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
998
999 /*
1000 * Inode data & attribute fork sizes, per inode.
1001 */
1002 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
1003
1004 #define XFS_DFORK_DSIZE(dip,mp) \
1005 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
1006 #define XFS_DFORK_ASIZE(dip,mp) \
1007 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0)
1008 #define XFS_DFORK_SIZE(dip,mp,w) \
1009 ((w) == XFS_DATA_FORK ? \
1010 XFS_DFORK_DSIZE(dip, mp) : \
1011 XFS_DFORK_ASIZE(dip, mp))
1012
1013 #define XFS_DFORK_MAXEXT(dip, mp, w) \
1014 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
1015
1016 /*
1017 * Return pointers to the data or attribute forks.
1018 */
1019 #define XFS_DFORK_DPTR(dip) \
1020 ((void *)dip + xfs_dinode_size(dip->di_version))
1021 #define XFS_DFORK_APTR(dip) \
1022 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
1023 #define XFS_DFORK_PTR(dip,w) \
1024 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
1025
1026 #define XFS_DFORK_FORMAT(dip,w) \
1027 ((w) == XFS_DATA_FORK ? \
1028 (dip)->di_format : \
1029 (dip)->di_aformat)
1030
1031 /*
1032 * For block and character special files the 32bit dev_t is stored at the
1033 * beginning of the data fork.
1034 */
xfs_dinode_get_rdev(struct xfs_dinode * dip)1035 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
1036 {
1037 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
1038 }
1039
xfs_dinode_put_rdev(struct xfs_dinode * dip,xfs_dev_t rdev)1040 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
1041 {
1042 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
1043 }
1044
1045 /*
1046 * Values for di_flags
1047 */
1048 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
1049 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
1050 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
1051 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
1052 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
1053 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
1054 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
1055 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
1056 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
1057 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
1058 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
1059 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
1060 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
1061 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
1062 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
1063 /* Do not use bit 15, di_flags is legacy and unchanging now */
1064
1065 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
1066 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
1067 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
1068 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1069 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
1070 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
1071 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
1072 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
1073 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
1074 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1075 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1076 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
1077 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1078 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
1079 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
1080
1081 #define XFS_DIFLAG_ANY \
1082 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1083 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1084 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1085 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1086 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1087
1088 /*
1089 * Values for di_flags2 These start by being exposed to userspace in the upper
1090 * 16 bits of the XFS_XFLAG_s range.
1091 */
1092 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
1093 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
1094 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
1095 #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */
1096 #define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */
1097
1098 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
1099 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
1100 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1101 #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT)
1102 #define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT)
1103
1104 #define XFS_DIFLAG2_ANY \
1105 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
1106 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64)
1107
xfs_dinode_has_bigtime(const struct xfs_dinode * dip)1108 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip)
1109 {
1110 return dip->di_version >= 3 &&
1111 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME));
1112 }
1113
xfs_dinode_has_large_extent_counts(const struct xfs_dinode * dip)1114 static inline bool xfs_dinode_has_large_extent_counts(
1115 const struct xfs_dinode *dip)
1116 {
1117 return dip->di_version >= 3 &&
1118 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64));
1119 }
1120
1121 /*
1122 * Inode number format:
1123 * low inopblog bits - offset in block
1124 * next agblklog bits - block number in ag
1125 * next agno_log bits - ag number
1126 * high agno_log-agblklog-inopblog bits - 0
1127 */
1128 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
1129 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
1130 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
1131 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log)
1132 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
1133 #define XFS_INO_BITS(mp) \
1134 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1135 #define XFS_INO_TO_AGNO(mp,i) \
1136 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1137 #define XFS_INO_TO_AGINO(mp,i) \
1138 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1139 #define XFS_INO_TO_AGBNO(mp,i) \
1140 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1141 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1142 #define XFS_INO_TO_OFFSET(mp,i) \
1143 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1144 #define XFS_INO_TO_FSB(mp,i) \
1145 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1146 #define XFS_AGINO_TO_INO(mp,a,i) \
1147 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1148 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
1149 #define XFS_AGINO_TO_OFFSET(mp,i) \
1150 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1151 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
1152 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1153 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1154 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
1155
1156 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
1157 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
1158
1159 /*
1160 * RealTime Device format definitions
1161 */
1162
1163 /* Min and max rt extent sizes, specified in bytes */
1164 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
1165 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
1166 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
1167
1168 /*
1169 * Dquot and dquot block format definitions
1170 */
1171 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
1172 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
1173
1174 #define XFS_DQTYPE_USER (1u << 0) /* user dquot record */
1175 #define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */
1176 #define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */
1177 #define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */
1178
1179 /* bitmask to determine if this is a user/group/project dquot */
1180 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \
1181 XFS_DQTYPE_PROJ | \
1182 XFS_DQTYPE_GROUP)
1183
1184 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \
1185 XFS_DQTYPE_BIGTIME)
1186
1187 /*
1188 * XFS Quota Timers
1189 * ================
1190 *
1191 * Traditional quota grace period expiration timers are an unsigned 32-bit
1192 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
1193 * Note that an expiration value of zero means that the quota limit has not
1194 * been reached, and therefore no expiration has been set. Therefore, the
1195 * ondisk min and max defined here can be used directly to constrain the incore
1196 * quota expiration timestamps on a Unix system.
1197 *
1198 * When bigtime is enabled, we trade two bits of precision to expand the
1199 * expiration timeout range to match that of big inode timestamps. The min and
1200 * max recorded here are the on-disk limits, not a Unix timestamp.
1201 *
1202 * The grace period for each quota type is stored in the root dquot (id = 0)
1203 * and is applied to a non-root dquot when it exceeds the soft or hard limits.
1204 * The length of quota grace periods are unsigned 32-bit quantities measured in
1205 * units of seconds. A value of zero means to use the default period.
1206 */
1207
1208 /*
1209 * Smallest possible ondisk quota expiration value with traditional timestamps.
1210 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
1211 */
1212 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
1213
1214 /*
1215 * Largest possible ondisk quota expiration value with traditional timestamps.
1216 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
1217 */
1218 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
1219
1220 /*
1221 * Smallest possible ondisk quota expiration value with bigtime timestamps.
1222 * This corresponds (after conversion to a Unix timestamp) with the incore
1223 * expiration of Jan 1 00:00:04 UTC 1970.
1224 */
1225 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN)
1226
1227 /*
1228 * Largest supported ondisk quota expiration value with bigtime timestamps.
1229 * This corresponds (after conversion to a Unix timestamp) with an incore
1230 * expiration of Jul 2 20:20:24 UTC 2486.
1231 *
1232 * The ondisk field supports values up to -1U, which corresponds to an incore
1233 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp,
1234 * so we cap the maximum bigtime quota expiration to the max inode timestamp.
1235 */
1236 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U)
1237
1238 /*
1239 * The following conversion factors assist in converting a quota expiration
1240 * timestamp between the incore and ondisk formats.
1241 */
1242 #define XFS_DQ_BIGTIME_SHIFT (2)
1243 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
1244
1245 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
xfs_dq_unix_to_bigtime(time64_t unix_seconds)1246 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds)
1247 {
1248 /*
1249 * Round the expiration timestamp up to the nearest bigtime timestamp
1250 * that we can store, to give users the most time to fix problems.
1251 */
1252 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >>
1253 XFS_DQ_BIGTIME_SHIFT;
1254 }
1255
1256 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)1257 static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
1258 {
1259 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT;
1260 }
1261
1262 /*
1263 * Default quota grace periods, ranging from zero (use the compiled defaults)
1264 * to ~136 years. These are applied to a non-root dquot that has exceeded
1265 * either limit.
1266 */
1267 #define XFS_DQ_GRACE_MIN ((int64_t)0)
1268 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX)
1269
1270 /* Maximum id value for a quota record */
1271 #define XFS_DQ_ID_MAX (U32_MAX)
1272
1273 /*
1274 * This is the main portion of the on-disk representation of quota information
1275 * for a user. We pad this with some more expansion room to construct the on
1276 * disk structure.
1277 */
1278 struct xfs_disk_dquot {
1279 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
1280 __u8 d_version; /* dquot version */
1281 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */
1282 __be32 d_id; /* user,project,group id */
1283 __be64 d_blk_hardlimit;/* absolute limit on disk blks */
1284 __be64 d_blk_softlimit;/* preferred limit on disk blks */
1285 __be64 d_ino_hardlimit;/* maximum # allocated inodes */
1286 __be64 d_ino_softlimit;/* preferred inode limit */
1287 __be64 d_bcount; /* disk blocks owned by the user */
1288 __be64 d_icount; /* inodes owned by the user */
1289 __be32 d_itimer; /* zero if within inode limits if not,
1290 this is when we refuse service */
1291 __be32 d_btimer; /* similar to above; for disk blocks */
1292 __be16 d_iwarns; /* warnings issued wrt num inodes */
1293 __be16 d_bwarns; /* warnings issued wrt disk blocks */
1294 __be32 d_pad0; /* 64 bit align */
1295 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
1296 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
1297 __be64 d_rtbcount; /* realtime blocks owned */
1298 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */
1299 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
1300 __be16 d_pad;
1301 };
1302
1303 /*
1304 * This is what goes on disk. This is separated from the xfs_disk_dquot because
1305 * carrying the unnecessary padding would be a waste of memory.
1306 */
1307 struct xfs_dqblk {
1308 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */
1309 char dd_fill[4];/* filling for posterity */
1310
1311 /*
1312 * These two are only present on filesystems with the CRC bits set.
1313 */
1314 __be32 dd_crc; /* checksum */
1315 __be64 dd_lsn; /* last modification in log */
1316 uuid_t dd_uuid; /* location information */
1317 };
1318
1319 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
1320
1321 /*
1322 * This defines the unit of allocation of dquots.
1323 *
1324 * Currently, it is just one file system block, and a 4K blk contains 30
1325 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
1326 * this more dynamic.
1327 *
1328 * However, if this number is changed, we have to make sure that we don't
1329 * implicitly assume that we do allocations in chunks of a single filesystem
1330 * block in the dquot/xqm code.
1331 *
1332 * This is part of the ondisk format because the structure size is not a power
1333 * of two, which leaves slack at the end of the disk block.
1334 */
1335 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
1336
1337 /*
1338 * Remote symlink format and access functions.
1339 */
1340 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
1341
1342 struct xfs_dsymlink_hdr {
1343 __be32 sl_magic;
1344 __be32 sl_offset;
1345 __be32 sl_bytes;
1346 __be32 sl_crc;
1347 uuid_t sl_uuid;
1348 __be64 sl_owner;
1349 __be64 sl_blkno;
1350 __be64 sl_lsn;
1351 };
1352
1353 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
1354
1355 #define XFS_SYMLINK_MAXLEN 1024
1356 /*
1357 * The maximum pathlen is 1024 bytes. Since the minimum file system
1358 * blocksize is 512 bytes, we can get a max of 3 extents back from
1359 * bmapi when crc headers are taken into account.
1360 */
1361 #define XFS_SYMLINK_MAPS 3
1362
1363 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
1364 ((bufsize) - (xfs_has_crc((mp)) ? \
1365 sizeof(struct xfs_dsymlink_hdr) : 0))
1366
1367
1368 /*
1369 * Allocation Btree format definitions
1370 *
1371 * There are two on-disk btrees, one sorted by blockno and one sorted
1372 * by blockcount and blockno. All blocks look the same to make the code
1373 * simpler; if we have time later, we'll make the optimizations.
1374 */
1375 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
1376 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
1377 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
1378 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
1379
1380 /*
1381 * Data record/key structure
1382 */
1383 typedef struct xfs_alloc_rec {
1384 __be32 ar_startblock; /* starting block number */
1385 __be32 ar_blockcount; /* count of free blocks */
1386 } xfs_alloc_rec_t, xfs_alloc_key_t;
1387
1388 typedef struct xfs_alloc_rec_incore {
1389 xfs_agblock_t ar_startblock; /* starting block number */
1390 xfs_extlen_t ar_blockcount; /* count of free blocks */
1391 } xfs_alloc_rec_incore_t;
1392
1393 /* btree pointer type */
1394 typedef __be32 xfs_alloc_ptr_t;
1395
1396 /*
1397 * Block numbers in the AG:
1398 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1399 */
1400 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1401 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1402
1403
1404 /*
1405 * Inode Allocation Btree format definitions
1406 *
1407 * There is a btree for the inode map per allocation group.
1408 */
1409 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
1410 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
1411 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
1412 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
1413
1414 typedef uint64_t xfs_inofree_t;
1415 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1416 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
1417 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
1418 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1419
1420 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
1421 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
1422 #define XFS_INODES_PER_HOLEMASK_BIT \
1423 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
1424
xfs_inobt_maskn(int i,int n)1425 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1426 {
1427 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1428 }
1429
1430 /*
1431 * The on-disk inode record structure has two formats. The original "full"
1432 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1433 * and replaces the 3 high-order freecount bytes wth the holemask and inode
1434 * count.
1435 *
1436 * The holemask of the sparse record format allows an inode chunk to have holes
1437 * that refer to blocks not owned by the inode record. This facilitates inode
1438 * allocation in the event of severe free space fragmentation.
1439 */
1440 typedef struct xfs_inobt_rec {
1441 __be32 ir_startino; /* starting inode number */
1442 union {
1443 struct {
1444 __be32 ir_freecount; /* count of free inodes */
1445 } f;
1446 struct {
1447 __be16 ir_holemask;/* hole mask for sparse chunks */
1448 __u8 ir_count; /* total inode count */
1449 __u8 ir_freecount; /* count of free inodes */
1450 } sp;
1451 } ir_u;
1452 __be64 ir_free; /* free inode mask */
1453 } xfs_inobt_rec_t;
1454
1455 typedef struct xfs_inobt_rec_incore {
1456 xfs_agino_t ir_startino; /* starting inode number */
1457 uint16_t ir_holemask; /* hole mask for sparse chunks */
1458 uint8_t ir_count; /* total inode count */
1459 uint8_t ir_freecount; /* count of free inodes (set bits) */
1460 xfs_inofree_t ir_free; /* free inode mask */
1461 } xfs_inobt_rec_incore_t;
1462
xfs_inobt_issparse(uint16_t holemask)1463 static inline bool xfs_inobt_issparse(uint16_t holemask)
1464 {
1465 /* non-zero holemask represents a sparse rec. */
1466 return holemask;
1467 }
1468
1469 /*
1470 * Key structure
1471 */
1472 typedef struct xfs_inobt_key {
1473 __be32 ir_startino; /* starting inode number */
1474 } xfs_inobt_key_t;
1475
1476 /* btree pointer type */
1477 typedef __be32 xfs_inobt_ptr_t;
1478
1479 /*
1480 * block numbers in the AG.
1481 */
1482 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1483 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1484
1485 /*
1486 * Reverse mapping btree format definitions
1487 *
1488 * There is a btree for the reverse map per allocation group
1489 */
1490 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
1491
1492 /*
1493 * Ownership info for an extent. This is used to create reverse-mapping
1494 * entries.
1495 */
1496 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
1497 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
1498 struct xfs_owner_info {
1499 uint64_t oi_owner;
1500 xfs_fileoff_t oi_offset;
1501 unsigned int oi_flags;
1502 };
1503
1504 /*
1505 * Special owner types.
1506 *
1507 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1508 * to tell us we have a special owner value. We use these for static metadata
1509 * allocated at mkfs/growfs time, as well as for freespace management metadata.
1510 */
1511 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
1512 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
1513 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
1514 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
1515 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
1516 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
1517 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
1518 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
1519 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
1520 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
1521
1522 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1523
1524 /*
1525 * Data record structure
1526 */
1527 struct xfs_rmap_rec {
1528 __be32 rm_startblock; /* extent start block */
1529 __be32 rm_blockcount; /* extent length */
1530 __be64 rm_owner; /* extent owner */
1531 __be64 rm_offset; /* offset within the owner */
1532 };
1533
1534 /*
1535 * rmap btree record
1536 * rm_offset:63 is the attribute fork flag
1537 * rm_offset:62 is the bmbt block flag
1538 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1539 * rm_offset:54-60 aren't used and should be zero
1540 * rm_offset:0-53 is the block offset within the inode
1541 */
1542 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
1543 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
1544 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
1545
1546 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
1547 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
1548 XFS_RMAP_OFF_BMBT_BLOCK | \
1549 XFS_RMAP_OFF_UNWRITTEN)
1550 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
1551
1552 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
1553
1554 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1555 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1556 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1557
1558 #define RMAPBT_STARTBLOCK_BITLEN 32
1559 #define RMAPBT_BLOCKCOUNT_BITLEN 32
1560 #define RMAPBT_OWNER_BITLEN 64
1561 #define RMAPBT_ATTRFLAG_BITLEN 1
1562 #define RMAPBT_BMBTFLAG_BITLEN 1
1563 #define RMAPBT_EXNTFLAG_BITLEN 1
1564 #define RMAPBT_UNUSED_OFFSET_BITLEN 7
1565 #define RMAPBT_OFFSET_BITLEN 54
1566
1567 /*
1568 * Key structure
1569 *
1570 * We don't use the length for lookups
1571 */
1572 struct xfs_rmap_key {
1573 __be32 rm_startblock; /* extent start block */
1574 __be64 rm_owner; /* extent owner */
1575 __be64 rm_offset; /* offset within the owner */
1576 } __attribute__((packed));
1577
1578 /* btree pointer type */
1579 typedef __be32 xfs_rmap_ptr_t;
1580
1581 #define XFS_RMAP_BLOCK(mp) \
1582 (xfs_has_finobt(((mp))) ? \
1583 XFS_FIBT_BLOCK(mp) + 1 : \
1584 XFS_IBT_BLOCK(mp) + 1)
1585
1586 /*
1587 * Reference Count Btree format definitions
1588 *
1589 */
1590 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
1591
1592 unsigned int xfs_refc_block(struct xfs_mount *mp);
1593
1594 /*
1595 * Data record/key structure
1596 *
1597 * Each record associates a range of physical blocks (starting at
1598 * rc_startblock and ending rc_blockcount blocks later) with a reference
1599 * count (rc_refcount). Extents that are being used to stage a copy on
1600 * write (CoW) operation are recorded in the refcount btree with a
1601 * refcount of 1. All other records must have a refcount > 1 and must
1602 * track an extent mapped only by file data forks.
1603 *
1604 * Extents with a single owner (attributes, metadata, non-shared file
1605 * data) are not tracked here. Free space is also not tracked here.
1606 * This is consistent with pre-reflink XFS.
1607 */
1608
1609 /*
1610 * Extents that are being used to stage a copy on write are stored
1611 * in the refcount btree with a refcount of 1 and the upper bit set
1612 * on the startblock. This speeds up mount time deletion of stale
1613 * staging extents because they're all at the right side of the tree.
1614 */
1615 #define XFS_REFC_COWFLAG (1U << 31)
1616 #define REFCNTBT_COWFLAG_BITLEN 1
1617 #define REFCNTBT_AGBLOCK_BITLEN 31
1618
1619 struct xfs_refcount_rec {
1620 __be32 rc_startblock; /* starting block number */
1621 __be32 rc_blockcount; /* count of blocks */
1622 __be32 rc_refcount; /* number of inodes linked here */
1623 };
1624
1625 struct xfs_refcount_key {
1626 __be32 rc_startblock; /* starting block number */
1627 };
1628
1629 #define MAXREFCOUNT ((xfs_nlink_t)~0U)
1630 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
1631
1632 /* btree pointer type */
1633 typedef __be32 xfs_refcount_ptr_t;
1634
1635
1636 /*
1637 * BMAP Btree format definitions
1638 *
1639 * This includes both the root block definition that sits inside an inode fork
1640 * and the record/pointer formats for the leaf/node in the blocks.
1641 */
1642 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
1643 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1644
1645 /*
1646 * Bmap root header, on-disk form only.
1647 */
1648 typedef struct xfs_bmdr_block {
1649 __be16 bb_level; /* 0 is a leaf */
1650 __be16 bb_numrecs; /* current # of data records */
1651 } xfs_bmdr_block_t;
1652
1653 /*
1654 * Bmap btree record and extent descriptor.
1655 * l0:63 is an extent flag (value 1 indicates non-normal).
1656 * l0:9-62 are startoff.
1657 * l0:0-8 and l1:21-63 are startblock.
1658 * l1:0-20 are blockcount.
1659 */
1660 #define BMBT_EXNTFLAG_BITLEN 1
1661 #define BMBT_STARTOFF_BITLEN 54
1662 #define BMBT_STARTBLOCK_BITLEN 52
1663 #define BMBT_BLOCKCOUNT_BITLEN 21
1664
1665 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
1666 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
1667
1668 #define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
1669
1670 /*
1671 * bmbt records have a file offset (block) field that is 54 bits wide, so this
1672 * is the largest xfs_fileoff_t that we ever expect to see.
1673 */
1674 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
1675
1676 typedef struct xfs_bmbt_rec {
1677 __be64 l0, l1;
1678 } xfs_bmbt_rec_t;
1679
1680 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
1681 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1682
1683 /*
1684 * Values and macros for delayed-allocation startblock fields.
1685 */
1686 #define STARTBLOCKVALBITS 17
1687 #define STARTBLOCKMASKBITS (15 + 20)
1688 #define STARTBLOCKMASK \
1689 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1690
isnullstartblock(xfs_fsblock_t x)1691 static inline int isnullstartblock(xfs_fsblock_t x)
1692 {
1693 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1694 }
1695
nullstartblock(int k)1696 static inline xfs_fsblock_t nullstartblock(int k)
1697 {
1698 ASSERT(k < (1 << STARTBLOCKVALBITS));
1699 return STARTBLOCKMASK | (k);
1700 }
1701
startblockval(xfs_fsblock_t x)1702 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1703 {
1704 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1705 }
1706
1707 /*
1708 * Key structure for non-leaf levels of the tree.
1709 */
1710 typedef struct xfs_bmbt_key {
1711 __be64 br_startoff; /* starting file offset */
1712 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1713
1714 /* btree pointer type */
1715 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1716
1717
1718 /*
1719 * Generic Btree block format definitions
1720 *
1721 * This is a combination of the actual format used on disk for short and long
1722 * format btrees. The first three fields are shared by both format, but the
1723 * pointers are different and should be used with care.
1724 *
1725 * To get the size of the actual short or long form headers please use the size
1726 * macros below. Never use sizeof(xfs_btree_block).
1727 *
1728 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1729 * with the crc feature bit, and all accesses to them must be conditional on
1730 * that flag.
1731 */
1732 /* short form block header */
1733 struct xfs_btree_block_shdr {
1734 __be32 bb_leftsib;
1735 __be32 bb_rightsib;
1736
1737 __be64 bb_blkno;
1738 __be64 bb_lsn;
1739 uuid_t bb_uuid;
1740 __be32 bb_owner;
1741 __le32 bb_crc;
1742 };
1743
1744 /* long form block header */
1745 struct xfs_btree_block_lhdr {
1746 __be64 bb_leftsib;
1747 __be64 bb_rightsib;
1748
1749 __be64 bb_blkno;
1750 __be64 bb_lsn;
1751 uuid_t bb_uuid;
1752 __be64 bb_owner;
1753 __le32 bb_crc;
1754 __be32 bb_pad; /* padding for alignment */
1755 };
1756
1757 struct xfs_btree_block {
1758 __be32 bb_magic; /* magic number for block type */
1759 __be16 bb_level; /* 0 is a leaf */
1760 __be16 bb_numrecs; /* current # of data records */
1761 union {
1762 struct xfs_btree_block_shdr s;
1763 struct xfs_btree_block_lhdr l;
1764 } bb_u; /* rest */
1765 };
1766
1767 /* size of a short form block */
1768 #define XFS_BTREE_SBLOCK_LEN \
1769 (offsetof(struct xfs_btree_block, bb_u) + \
1770 offsetof(struct xfs_btree_block_shdr, bb_blkno))
1771 /* size of a long form block */
1772 #define XFS_BTREE_LBLOCK_LEN \
1773 (offsetof(struct xfs_btree_block, bb_u) + \
1774 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1775
1776 /* sizes of CRC enabled btree blocks */
1777 #define XFS_BTREE_SBLOCK_CRC_LEN \
1778 (offsetof(struct xfs_btree_block, bb_u) + \
1779 sizeof(struct xfs_btree_block_shdr))
1780 #define XFS_BTREE_LBLOCK_CRC_LEN \
1781 (offsetof(struct xfs_btree_block, bb_u) + \
1782 sizeof(struct xfs_btree_block_lhdr))
1783
1784 #define XFS_BTREE_SBLOCK_CRC_OFF \
1785 offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1786 #define XFS_BTREE_LBLOCK_CRC_OFF \
1787 offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1788
1789 /*
1790 * On-disk XFS access control list structure.
1791 */
1792 struct xfs_acl_entry {
1793 __be32 ae_tag;
1794 __be32 ae_id;
1795 __be16 ae_perm;
1796 __be16 ae_pad; /* fill the implicit hole in the structure */
1797 };
1798
1799 struct xfs_acl {
1800 __be32 acl_cnt;
1801 struct xfs_acl_entry acl_entry[];
1802 };
1803
1804 /*
1805 * The number of ACL entries allowed is defined by the on-disk format.
1806 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1807 * limited only by the maximum size of the xattr that stores the information.
1808 */
1809 #define XFS_ACL_MAX_ENTRIES(mp) \
1810 (xfs_has_crc(mp) \
1811 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1812 sizeof(struct xfs_acl_entry) \
1813 : 25)
1814
1815 #define XFS_ACL_SIZE(cnt) \
1816 (sizeof(struct xfs_acl) + \
1817 sizeof(struct xfs_acl_entry) * cnt)
1818
1819 #define XFS_ACL_MAX_SIZE(mp) \
1820 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1821
1822
1823 /* On-disk XFS extended attribute names */
1824 #define SGI_ACL_FILE "SGI_ACL_FILE"
1825 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
1826 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
1827 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
1828
1829 #endif /* __XFS_FORMAT_H__ */
1830