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6ca1c906 DC |
1 | /* |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | #ifndef __XFS_FORMAT_H__ | |
19 | #define __XFS_FORMAT_H__ | |
20 | ||
21 | /* | |
22 | * XFS On Disk Format Definitions | |
23 | * | |
24 | * This header file defines all the on-disk format definitions for | |
25 | * general XFS objects. Directory and attribute related objects are defined in | |
26 | * xfs_da_format.h, which log and log item formats are defined in | |
27 | * xfs_log_format.h. Everything else goes here. | |
28 | */ | |
29 | ||
1fb7e48d DC |
30 | struct xfs_mount; |
31 | struct xfs_trans; | |
32 | struct xfs_inode; | |
33 | struct xfs_buf; | |
34 | struct xfs_ifork; | |
35 | ||
bb58e618 CH |
36 | /* |
37 | * Super block | |
38 | * Fits into a sector-sized buffer at address 0 of each allocation group. | |
39 | * Only the first of these is ever updated except during growfs. | |
40 | */ | |
41 | #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */ | |
42 | #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */ | |
43 | #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */ | |
44 | #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */ | |
45 | #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */ | |
46 | #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */ | |
47 | #define XFS_SB_VERSION_NUMBITS 0x000f | |
48 | #define XFS_SB_VERSION_ALLFBITS 0xfff0 | |
49 | #define XFS_SB_VERSION_ATTRBIT 0x0010 | |
50 | #define XFS_SB_VERSION_NLINKBIT 0x0020 | |
51 | #define XFS_SB_VERSION_QUOTABIT 0x0040 | |
52 | #define XFS_SB_VERSION_ALIGNBIT 0x0080 | |
53 | #define XFS_SB_VERSION_DALIGNBIT 0x0100 | |
54 | #define XFS_SB_VERSION_SHAREDBIT 0x0200 | |
55 | #define XFS_SB_VERSION_LOGV2BIT 0x0400 | |
56 | #define XFS_SB_VERSION_SECTORBIT 0x0800 | |
57 | #define XFS_SB_VERSION_EXTFLGBIT 0x1000 | |
58 | #define XFS_SB_VERSION_DIRV2BIT 0x2000 | |
59 | #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */ | |
60 | #define XFS_SB_VERSION_MOREBITSBIT 0x8000 | |
61 | ||
51fcbfe7 JT |
62 | /* |
63 | * The size of a single extended attribute on disk is limited by | |
64 | * the size of index values within the attribute entries themselves. | |
65 | * These are be16 fields, so we can only support attribute data | |
66 | * sizes up to 2^16 bytes in length. | |
67 | */ | |
68 | #define XFS_XATTR_SIZE_MAX (1 << 16) | |
69 | ||
bb58e618 CH |
70 | /* |
71 | * Supported feature bit list is just all bits in the versionnum field because | |
72 | * we've used them all up and understand them all. Except, of course, for the | |
73 | * shared superblock bit, which nobody knows what it does and so is unsupported. | |
74 | */ | |
75 | #define XFS_SB_VERSION_OKBITS \ | |
76 | ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ | |
77 | ~XFS_SB_VERSION_SHAREDBIT) | |
78 | ||
79 | /* | |
80 | * There are two words to hold XFS "feature" bits: the original | |
81 | * word, sb_versionnum, and sb_features2. Whenever a bit is set in | |
82 | * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. | |
83 | * | |
84 | * These defines represent bits in sb_features2. | |
85 | */ | |
86 | #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 | |
87 | #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ | |
88 | #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 | |
89 | #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ | |
90 | #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ | |
91 | #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ | |
92 | #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ | |
93 | #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ | |
94 | ||
95 | #define XFS_SB_VERSION2_OKBITS \ | |
96 | (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ | |
97 | XFS_SB_VERSION2_ATTR2BIT | \ | |
98 | XFS_SB_VERSION2_PROJID32BIT | \ | |
99 | XFS_SB_VERSION2_FTYPE) | |
100 | ||
101 | /* | |
102 | * Superblock - in core version. Must match the ondisk version below. | |
103 | * Must be padded to 64 bit alignment. | |
104 | */ | |
105 | typedef struct xfs_sb { | |
106 | __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ | |
107 | __uint32_t sb_blocksize; /* logical block size, bytes */ | |
108 | xfs_rfsblock_t sb_dblocks; /* number of data blocks */ | |
109 | xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ | |
110 | xfs_rtblock_t sb_rextents; /* number of realtime extents */ | |
ce748eaa | 111 | uuid_t sb_uuid; /* user-visible file system unique id */ |
bb58e618 CH |
112 | xfs_fsblock_t sb_logstart; /* starting block of log if internal */ |
113 | xfs_ino_t sb_rootino; /* root inode number */ | |
114 | xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ | |
115 | xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ | |
116 | xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ | |
117 | xfs_agblock_t sb_agblocks; /* size of an allocation group */ | |
118 | xfs_agnumber_t sb_agcount; /* number of allocation groups */ | |
119 | xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ | |
120 | xfs_extlen_t sb_logblocks; /* number of log blocks */ | |
121 | __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ | |
122 | __uint16_t sb_sectsize; /* volume sector size, bytes */ | |
123 | __uint16_t sb_inodesize; /* inode size, bytes */ | |
124 | __uint16_t sb_inopblock; /* inodes per block */ | |
125 | char sb_fname[12]; /* file system name */ | |
126 | __uint8_t sb_blocklog; /* log2 of sb_blocksize */ | |
127 | __uint8_t sb_sectlog; /* log2 of sb_sectsize */ | |
128 | __uint8_t sb_inodelog; /* log2 of sb_inodesize */ | |
129 | __uint8_t sb_inopblog; /* log2 of sb_inopblock */ | |
130 | __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ | |
131 | __uint8_t sb_rextslog; /* log2 of sb_rextents */ | |
132 | __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ | |
133 | __uint8_t sb_imax_pct; /* max % of fs for inode space */ | |
134 | /* statistics */ | |
135 | /* | |
136 | * These fields must remain contiguous. If you really | |
137 | * want to change their layout, make sure you fix the | |
138 | * code in xfs_trans_apply_sb_deltas(). | |
139 | */ | |
140 | __uint64_t sb_icount; /* allocated inodes */ | |
141 | __uint64_t sb_ifree; /* free inodes */ | |
142 | __uint64_t sb_fdblocks; /* free data blocks */ | |
143 | __uint64_t sb_frextents; /* free realtime extents */ | |
144 | /* | |
145 | * End contiguous fields. | |
146 | */ | |
147 | xfs_ino_t sb_uquotino; /* user quota inode */ | |
148 | xfs_ino_t sb_gquotino; /* group quota inode */ | |
149 | __uint16_t sb_qflags; /* quota flags */ | |
150 | __uint8_t sb_flags; /* misc. flags */ | |
151 | __uint8_t sb_shared_vn; /* shared version number */ | |
152 | xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ | |
153 | __uint32_t sb_unit; /* stripe or raid unit */ | |
154 | __uint32_t sb_width; /* stripe or raid width */ | |
155 | __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ | |
156 | __uint8_t sb_logsectlog; /* log2 of the log sector size */ | |
157 | __uint16_t sb_logsectsize; /* sector size for the log, bytes */ | |
158 | __uint32_t sb_logsunit; /* stripe unit size for the log */ | |
159 | __uint32_t sb_features2; /* additional feature bits */ | |
160 | ||
161 | /* | |
074e427b DC |
162 | * bad features2 field as a result of failing to pad the sb structure to |
163 | * 64 bits. Some machines will be using this field for features2 bits. | |
164 | * Easiest just to mark it bad and not use it for anything else. | |
165 | * | |
166 | * This is not kept up to date in memory; it is always overwritten by | |
167 | * the value in sb_features2 when formatting the incore superblock to | |
168 | * the disk buffer. | |
bb58e618 CH |
169 | */ |
170 | __uint32_t sb_bad_features2; | |
171 | ||
172 | /* version 5 superblock fields start here */ | |
173 | ||
174 | /* feature masks */ | |
175 | __uint32_t sb_features_compat; | |
176 | __uint32_t sb_features_ro_compat; | |
177 | __uint32_t sb_features_incompat; | |
178 | __uint32_t sb_features_log_incompat; | |
179 | ||
180 | __uint32_t sb_crc; /* superblock crc */ | |
fb4f2b4e | 181 | xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ |
bb58e618 CH |
182 | |
183 | xfs_ino_t sb_pquotino; /* project quota inode */ | |
184 | xfs_lsn_t sb_lsn; /* last write sequence */ | |
ce748eaa | 185 | uuid_t sb_meta_uuid; /* metadata file system unique id */ |
bb58e618 CH |
186 | |
187 | /* must be padded to 64 bit alignment */ | |
188 | } xfs_sb_t; | |
189 | ||
190 | #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) | |
191 | ||
192 | /* | |
193 | * Superblock - on disk version. Must match the in core version above. | |
194 | * Must be padded to 64 bit alignment. | |
195 | */ | |
196 | typedef struct xfs_dsb { | |
197 | __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ | |
198 | __be32 sb_blocksize; /* logical block size, bytes */ | |
199 | __be64 sb_dblocks; /* number of data blocks */ | |
200 | __be64 sb_rblocks; /* number of realtime blocks */ | |
201 | __be64 sb_rextents; /* number of realtime extents */ | |
ce748eaa | 202 | uuid_t sb_uuid; /* user-visible file system unique id */ |
bb58e618 CH |
203 | __be64 sb_logstart; /* starting block of log if internal */ |
204 | __be64 sb_rootino; /* root inode number */ | |
205 | __be64 sb_rbmino; /* bitmap inode for realtime extents */ | |
206 | __be64 sb_rsumino; /* summary inode for rt bitmap */ | |
207 | __be32 sb_rextsize; /* realtime extent size, blocks */ | |
208 | __be32 sb_agblocks; /* size of an allocation group */ | |
209 | __be32 sb_agcount; /* number of allocation groups */ | |
210 | __be32 sb_rbmblocks; /* number of rt bitmap blocks */ | |
211 | __be32 sb_logblocks; /* number of log blocks */ | |
212 | __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ | |
213 | __be16 sb_sectsize; /* volume sector size, bytes */ | |
214 | __be16 sb_inodesize; /* inode size, bytes */ | |
215 | __be16 sb_inopblock; /* inodes per block */ | |
216 | char sb_fname[12]; /* file system name */ | |
217 | __u8 sb_blocklog; /* log2 of sb_blocksize */ | |
218 | __u8 sb_sectlog; /* log2 of sb_sectsize */ | |
219 | __u8 sb_inodelog; /* log2 of sb_inodesize */ | |
220 | __u8 sb_inopblog; /* log2 of sb_inopblock */ | |
221 | __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ | |
222 | __u8 sb_rextslog; /* log2 of sb_rextents */ | |
223 | __u8 sb_inprogress; /* mkfs is in progress, don't mount */ | |
224 | __u8 sb_imax_pct; /* max % of fs for inode space */ | |
225 | /* statistics */ | |
226 | /* | |
227 | * These fields must remain contiguous. If you really | |
228 | * want to change their layout, make sure you fix the | |
229 | * code in xfs_trans_apply_sb_deltas(). | |
230 | */ | |
231 | __be64 sb_icount; /* allocated inodes */ | |
232 | __be64 sb_ifree; /* free inodes */ | |
233 | __be64 sb_fdblocks; /* free data blocks */ | |
234 | __be64 sb_frextents; /* free realtime extents */ | |
235 | /* | |
236 | * End contiguous fields. | |
237 | */ | |
238 | __be64 sb_uquotino; /* user quota inode */ | |
239 | __be64 sb_gquotino; /* group quota inode */ | |
240 | __be16 sb_qflags; /* quota flags */ | |
241 | __u8 sb_flags; /* misc. flags */ | |
242 | __u8 sb_shared_vn; /* shared version number */ | |
243 | __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ | |
244 | __be32 sb_unit; /* stripe or raid unit */ | |
245 | __be32 sb_width; /* stripe or raid width */ | |
246 | __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ | |
247 | __u8 sb_logsectlog; /* log2 of the log sector size */ | |
248 | __be16 sb_logsectsize; /* sector size for the log, bytes */ | |
249 | __be32 sb_logsunit; /* stripe unit size for the log */ | |
250 | __be32 sb_features2; /* additional feature bits */ | |
251 | /* | |
252 | * bad features2 field as a result of failing to pad the sb | |
253 | * structure to 64 bits. Some machines will be using this field | |
254 | * for features2 bits. Easiest just to mark it bad and not use | |
255 | * it for anything else. | |
256 | */ | |
257 | __be32 sb_bad_features2; | |
258 | ||
259 | /* version 5 superblock fields start here */ | |
260 | ||
261 | /* feature masks */ | |
262 | __be32 sb_features_compat; | |
263 | __be32 sb_features_ro_compat; | |
264 | __be32 sb_features_incompat; | |
265 | __be32 sb_features_log_incompat; | |
266 | ||
267 | __le32 sb_crc; /* superblock crc */ | |
fb4f2b4e | 268 | __be32 sb_spino_align; /* sparse inode chunk alignment */ |
bb58e618 CH |
269 | |
270 | __be64 sb_pquotino; /* project quota inode */ | |
271 | __be64 sb_lsn; /* last write sequence */ | |
ce748eaa | 272 | uuid_t sb_meta_uuid; /* metadata file system unique id */ |
bb58e618 CH |
273 | |
274 | /* must be padded to 64 bit alignment */ | |
275 | } xfs_dsb_t; | |
276 | ||
bb58e618 CH |
277 | |
278 | /* | |
279 | * Misc. Flags - warning - these will be cleared by xfs_repair unless | |
280 | * a feature bit is set when the flag is used. | |
281 | */ | |
282 | #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ | |
283 | #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ | |
284 | ||
285 | /* | |
286 | * define max. shared version we can interoperate with | |
287 | */ | |
288 | #define XFS_SB_MAX_SHARED_VN 0 | |
289 | ||
290 | #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) | |
291 | ||
292 | /* | |
293 | * The first XFS version we support is a v4 superblock with V2 directories. | |
294 | */ | |
295 | static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) | |
296 | { | |
297 | if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) | |
298 | return false; | |
299 | ||
300 | /* check for unknown features in the fs */ | |
301 | if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || | |
302 | ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && | |
303 | (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) | |
304 | return false; | |
305 | ||
306 | return true; | |
307 | } | |
308 | ||
309 | static inline bool xfs_sb_good_version(struct xfs_sb *sbp) | |
310 | { | |
311 | if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) | |
312 | return true; | |
313 | if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) | |
314 | return xfs_sb_good_v4_features(sbp); | |
315 | return false; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Detect a mismatched features2 field. Older kernels read/wrote | |
320 | * this into the wrong slot, so to be safe we keep them in sync. | |
321 | */ | |
322 | static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) | |
323 | { | |
324 | return sbp->sb_bad_features2 != sbp->sb_features2; | |
325 | } | |
326 | ||
327 | static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) | |
328 | { | |
329 | return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); | |
330 | } | |
331 | ||
332 | static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) | |
333 | { | |
334 | sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; | |
335 | } | |
336 | ||
337 | static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) | |
338 | { | |
339 | return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); | |
340 | } | |
341 | ||
342 | static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) | |
343 | { | |
344 | sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; | |
345 | } | |
346 | ||
347 | static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) | |
348 | { | |
349 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || | |
350 | (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); | |
351 | } | |
352 | ||
353 | static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) | |
354 | { | |
355 | return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); | |
356 | } | |
357 | ||
358 | static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) | |
359 | { | |
360 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || | |
361 | (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); | |
362 | } | |
363 | ||
364 | static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp) | |
365 | { | |
366 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || | |
367 | (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT); | |
368 | } | |
369 | ||
370 | static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) | |
371 | { | |
372 | return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); | |
373 | } | |
374 | ||
375 | static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) | |
376 | { | |
377 | return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); | |
378 | } | |
379 | ||
380 | static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) | |
381 | { | |
382 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || | |
383 | (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); | |
384 | } | |
385 | ||
386 | /* | |
387 | * sb_features2 bit version macros. | |
388 | */ | |
389 | static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) | |
390 | { | |
391 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || | |
392 | (xfs_sb_version_hasmorebits(sbp) && | |
393 | (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); | |
394 | } | |
395 | ||
396 | static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) | |
397 | { | |
398 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || | |
399 | (xfs_sb_version_hasmorebits(sbp) && | |
400 | (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); | |
401 | } | |
402 | ||
403 | static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) | |
404 | { | |
405 | sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; | |
406 | sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; | |
bb58e618 CH |
407 | } |
408 | ||
409 | static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) | |
410 | { | |
411 | sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; | |
bb58e618 CH |
412 | if (!sbp->sb_features2) |
413 | sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; | |
414 | } | |
415 | ||
416 | static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) | |
417 | { | |
418 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || | |
419 | (xfs_sb_version_hasmorebits(sbp) && | |
420 | (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); | |
421 | } | |
422 | ||
423 | static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) | |
424 | { | |
425 | sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; | |
426 | sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; | |
bb58e618 CH |
427 | } |
428 | ||
429 | /* | |
430 | * Extended v5 superblock feature masks. These are to be used for new v5 | |
431 | * superblock features only. | |
432 | * | |
433 | * Compat features are new features that old kernels will not notice or affect | |
434 | * and so can mount read-write without issues. | |
435 | * | |
436 | * RO-Compat (read only) are features that old kernels can read but will break | |
437 | * if they write. Hence only read-only mounts of such filesystems are allowed on | |
438 | * kernels that don't support the feature bit. | |
439 | * | |
440 | * InCompat features are features which old kernels will not understand and so | |
441 | * must not mount. | |
442 | * | |
443 | * Log-InCompat features are for changes to log formats or new transactions that | |
444 | * can't be replayed on older kernels. The fields are set when the filesystem is | |
445 | * mounted, and a clean unmount clears the fields. | |
446 | */ | |
447 | #define XFS_SB_FEAT_COMPAT_ALL 0 | |
448 | #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL | |
449 | static inline bool | |
450 | xfs_sb_has_compat_feature( | |
451 | struct xfs_sb *sbp, | |
452 | __uint32_t feature) | |
453 | { | |
454 | return (sbp->sb_features_compat & feature) != 0; | |
455 | } | |
456 | ||
457 | #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ | |
b8704944 | 458 | #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ |
46eeb521 | 459 | #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ |
bb58e618 | 460 | #define XFS_SB_FEAT_RO_COMPAT_ALL \ |
1c0607ac | 461 | (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ |
e54b5bf9 DW |
462 | XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ |
463 | XFS_SB_FEAT_RO_COMPAT_REFLINK) | |
bb58e618 CH |
464 | #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL |
465 | static inline bool | |
466 | xfs_sb_has_ro_compat_feature( | |
467 | struct xfs_sb *sbp, | |
468 | __uint32_t feature) | |
469 | { | |
470 | return (sbp->sb_features_ro_compat & feature) != 0; | |
471 | } | |
472 | ||
473 | #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ | |
e5376fc1 | 474 | #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ |
ce748eaa | 475 | #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ |
bb58e618 | 476 | #define XFS_SB_FEAT_INCOMPAT_ALL \ |
22ce1e14 | 477 | (XFS_SB_FEAT_INCOMPAT_FTYPE| \ |
ce748eaa ES |
478 | XFS_SB_FEAT_INCOMPAT_SPINODES| \ |
479 | XFS_SB_FEAT_INCOMPAT_META_UUID) | |
bb58e618 CH |
480 | |
481 | #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL | |
482 | static inline bool | |
483 | xfs_sb_has_incompat_feature( | |
484 | struct xfs_sb *sbp, | |
485 | __uint32_t feature) | |
486 | { | |
487 | return (sbp->sb_features_incompat & feature) != 0; | |
488 | } | |
489 | ||
490 | #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 | |
491 | #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL | |
492 | static inline bool | |
493 | xfs_sb_has_incompat_log_feature( | |
494 | struct xfs_sb *sbp, | |
495 | __uint32_t feature) | |
496 | { | |
497 | return (sbp->sb_features_log_incompat & feature) != 0; | |
498 | } | |
499 | ||
500 | /* | |
501 | * V5 superblock specific feature checks | |
502 | */ | |
503 | static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) | |
504 | { | |
505 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; | |
506 | } | |
507 | ||
508 | static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) | |
509 | { | |
510 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; | |
511 | } | |
512 | ||
513 | static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) | |
514 | { | |
515 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && | |
516 | xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || | |
517 | (xfs_sb_version_hasmorebits(sbp) && | |
518 | (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); | |
519 | } | |
520 | ||
521 | static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) | |
522 | { | |
523 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && | |
524 | (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); | |
525 | } | |
526 | ||
e5376fc1 BF |
527 | static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) |
528 | { | |
529 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && | |
530 | xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); | |
531 | } | |
532 | ||
ce748eaa ES |
533 | /* |
534 | * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID | |
535 | * is stored separately from the user-visible UUID; this allows the | |
536 | * user-visible UUID to be changed on V5 filesystems which have a | |
537 | * filesystem UUID stamped into every piece of metadata. | |
538 | */ | |
539 | static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) | |
540 | { | |
541 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && | |
542 | (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); | |
543 | } | |
544 | ||
b8704944 DW |
545 | static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp) |
546 | { | |
547 | return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && | |
548 | (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT); | |
549 | } | |
550 | ||
46eeb521 DW |
551 | static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) |
552 | { | |
553 | return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && | |
554 | (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); | |
555 | } | |
556 | ||
bb58e618 CH |
557 | /* |
558 | * end of superblock version macros | |
559 | */ | |
560 | ||
561 | static inline bool | |
562 | xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) | |
563 | { | |
564 | return (ino == sbp->sb_uquotino || | |
565 | ino == sbp->sb_gquotino || | |
566 | ino == sbp->sb_pquotino); | |
567 | } | |
568 | ||
569 | #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ | |
570 | #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) | |
571 | #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) | |
572 | ||
573 | #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) | |
574 | #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ | |
575 | xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) | |
576 | #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ | |
577 | XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) | |
578 | ||
579 | /* | |
580 | * File system sector to basic block conversions. | |
581 | */ | |
582 | #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) | |
583 | ||
584 | /* | |
585 | * File system block to basic block conversions. | |
586 | */ | |
587 | #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) | |
588 | #define XFS_BB_TO_FSB(mp,bb) \ | |
589 | (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) | |
590 | #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) | |
591 | ||
592 | /* | |
593 | * File system block to byte conversions. | |
594 | */ | |
595 | #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) | |
596 | #define XFS_B_TO_FSB(mp,b) \ | |
597 | ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) | |
598 | #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) | |
599 | #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) | |
600 | ||
4fb6e8ad CH |
601 | /* |
602 | * Allocation group header | |
603 | * | |
604 | * This is divided into three structures, placed in sequential 512-byte | |
605 | * buffers after a copy of the superblock (also in a 512-byte buffer). | |
606 | */ | |
607 | #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ | |
608 | #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ | |
609 | #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ | |
610 | #define XFS_AGF_VERSION 1 | |
611 | #define XFS_AGI_VERSION 1 | |
612 | ||
613 | #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) | |
614 | #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) | |
615 | ||
616 | /* | |
b8704944 | 617 | * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the |
4fb6e8ad CH |
618 | * arrays below. |
619 | */ | |
b8704944 | 620 | #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1) |
4fb6e8ad CH |
621 | |
622 | /* | |
623 | * The second word of agf_levels in the first a.g. overlaps the EFS | |
624 | * superblock's magic number. Since the magic numbers valid for EFS | |
625 | * are > 64k, our value cannot be confused for an EFS superblock's. | |
626 | */ | |
627 | ||
628 | typedef struct xfs_agf { | |
629 | /* | |
630 | * Common allocation group header information | |
631 | */ | |
632 | __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ | |
633 | __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ | |
634 | __be32 agf_seqno; /* sequence # starting from 0 */ | |
635 | __be32 agf_length; /* size in blocks of a.g. */ | |
636 | /* | |
b8704944 | 637 | * Freespace and rmap information |
4fb6e8ad CH |
638 | */ |
639 | __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ | |
4fb6e8ad | 640 | __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ |
4fb6e8ad CH |
641 | |
642 | __be32 agf_flfirst; /* first freelist block's index */ | |
643 | __be32 agf_fllast; /* last freelist block's index */ | |
644 | __be32 agf_flcount; /* count of blocks in freelist */ | |
645 | __be32 agf_freeblks; /* total free blocks */ | |
646 | ||
647 | __be32 agf_longest; /* longest free space */ | |
648 | __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ | |
649 | uuid_t agf_uuid; /* uuid of filesystem */ | |
650 | ||
f32866fd | 651 | __be32 agf_rmap_blocks; /* rmapbt blocks used */ |
46eeb521 DW |
652 | __be32 agf_refcount_blocks; /* refcountbt blocks used */ |
653 | ||
654 | __be32 agf_refcount_root; /* refcount tree root block */ | |
655 | __be32 agf_refcount_level; /* refcount btree levels */ | |
f32866fd | 656 | |
4fb6e8ad CH |
657 | /* |
658 | * reserve some contiguous space for future logged fields before we add | |
659 | * the unlogged fields. This makes the range logging via flags and | |
660 | * structure offsets much simpler. | |
661 | */ | |
46eeb521 | 662 | __be64 agf_spare64[14]; |
4fb6e8ad CH |
663 | |
664 | /* unlogged fields, written during buffer writeback. */ | |
665 | __be64 agf_lsn; /* last write sequence */ | |
666 | __be32 agf_crc; /* crc of agf sector */ | |
667 | __be32 agf_spare2; | |
668 | ||
669 | /* structure must be padded to 64 bit alignment */ | |
670 | } xfs_agf_t; | |
671 | ||
672 | #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) | |
673 | ||
674 | #define XFS_AGF_MAGICNUM 0x00000001 | |
675 | #define XFS_AGF_VERSIONNUM 0x00000002 | |
676 | #define XFS_AGF_SEQNO 0x00000004 | |
677 | #define XFS_AGF_LENGTH 0x00000008 | |
678 | #define XFS_AGF_ROOTS 0x00000010 | |
679 | #define XFS_AGF_LEVELS 0x00000020 | |
680 | #define XFS_AGF_FLFIRST 0x00000040 | |
681 | #define XFS_AGF_FLLAST 0x00000080 | |
682 | #define XFS_AGF_FLCOUNT 0x00000100 | |
683 | #define XFS_AGF_FREEBLKS 0x00000200 | |
684 | #define XFS_AGF_LONGEST 0x00000400 | |
685 | #define XFS_AGF_BTREEBLKS 0x00000800 | |
686 | #define XFS_AGF_UUID 0x00001000 | |
f32866fd | 687 | #define XFS_AGF_RMAP_BLOCKS 0x00002000 |
bdf28630 DW |
688 | #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 |
689 | #define XFS_AGF_REFCOUNT_ROOT 0x00008000 | |
690 | #define XFS_AGF_REFCOUNT_LEVEL 0x00010000 | |
691 | #define XFS_AGF_SPARE64 0x00020000 | |
692 | #define XFS_AGF_NUM_BITS 18 | |
4fb6e8ad CH |
693 | #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) |
694 | ||
695 | #define XFS_AGF_FLAGS \ | |
696 | { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ | |
697 | { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ | |
698 | { XFS_AGF_SEQNO, "SEQNO" }, \ | |
699 | { XFS_AGF_LENGTH, "LENGTH" }, \ | |
700 | { XFS_AGF_ROOTS, "ROOTS" }, \ | |
701 | { XFS_AGF_LEVELS, "LEVELS" }, \ | |
702 | { XFS_AGF_FLFIRST, "FLFIRST" }, \ | |
703 | { XFS_AGF_FLLAST, "FLLAST" }, \ | |
704 | { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ | |
705 | { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ | |
706 | { XFS_AGF_LONGEST, "LONGEST" }, \ | |
707 | { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ | |
f32866fd | 708 | { XFS_AGF_UUID, "UUID" }, \ |
da1f039d | 709 | { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ |
bdf28630 DW |
710 | { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ |
711 | { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ | |
712 | { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ | |
da1f039d | 713 | { XFS_AGF_SPARE64, "SPARE64" } |
4fb6e8ad CH |
714 | |
715 | /* disk block (xfs_daddr_t) in the AG */ | |
716 | #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) | |
717 | #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) | |
718 | #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) | |
719 | ||
720 | /* | |
721 | * Size of the unlinked inode hash table in the agi. | |
722 | */ | |
723 | #define XFS_AGI_UNLINKED_BUCKETS 64 | |
724 | ||
725 | typedef struct xfs_agi { | |
726 | /* | |
727 | * Common allocation group header information | |
728 | */ | |
729 | __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ | |
730 | __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ | |
731 | __be32 agi_seqno; /* sequence # starting from 0 */ | |
732 | __be32 agi_length; /* size in blocks of a.g. */ | |
733 | /* | |
734 | * Inode information | |
735 | * Inodes are mapped by interpreting the inode number, so no | |
736 | * mapping data is needed here. | |
737 | */ | |
738 | __be32 agi_count; /* count of allocated inodes */ | |
739 | __be32 agi_root; /* root of inode btree */ | |
740 | __be32 agi_level; /* levels in inode btree */ | |
741 | __be32 agi_freecount; /* number of free inodes */ | |
742 | ||
743 | __be32 agi_newino; /* new inode just allocated */ | |
744 | __be32 agi_dirino; /* last directory inode chunk */ | |
745 | /* | |
746 | * Hash table of inodes which have been unlinked but are | |
747 | * still being referenced. | |
748 | */ | |
749 | __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; | |
750 | /* | |
751 | * This marks the end of logging region 1 and start of logging region 2. | |
752 | */ | |
753 | uuid_t agi_uuid; /* uuid of filesystem */ | |
754 | __be32 agi_crc; /* crc of agi sector */ | |
755 | __be32 agi_pad32; | |
756 | __be64 agi_lsn; /* last write sequence */ | |
757 | ||
758 | __be32 agi_free_root; /* root of the free inode btree */ | |
759 | __be32 agi_free_level;/* levels in free inode btree */ | |
760 | ||
761 | /* structure must be padded to 64 bit alignment */ | |
762 | } xfs_agi_t; | |
763 | ||
764 | #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) | |
765 | ||
766 | #define XFS_AGI_MAGICNUM (1 << 0) | |
767 | #define XFS_AGI_VERSIONNUM (1 << 1) | |
768 | #define XFS_AGI_SEQNO (1 << 2) | |
769 | #define XFS_AGI_LENGTH (1 << 3) | |
770 | #define XFS_AGI_COUNT (1 << 4) | |
771 | #define XFS_AGI_ROOT (1 << 5) | |
772 | #define XFS_AGI_LEVEL (1 << 6) | |
773 | #define XFS_AGI_FREECOUNT (1 << 7) | |
774 | #define XFS_AGI_NEWINO (1 << 8) | |
775 | #define XFS_AGI_DIRINO (1 << 9) | |
776 | #define XFS_AGI_UNLINKED (1 << 10) | |
777 | #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ | |
778 | #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) | |
779 | #define XFS_AGI_FREE_ROOT (1 << 11) | |
780 | #define XFS_AGI_FREE_LEVEL (1 << 12) | |
781 | #define XFS_AGI_NUM_BITS_R2 13 | |
782 | ||
783 | /* disk block (xfs_daddr_t) in the AG */ | |
784 | #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) | |
785 | #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) | |
786 | #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) | |
787 | ||
788 | /* | |
789 | * The third a.g. block contains the a.g. freelist, an array | |
790 | * of block pointers to blocks owned by the allocation btree code. | |
791 | */ | |
792 | #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) | |
793 | #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) | |
794 | #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) | |
795 | ||
796 | #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ | |
797 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
798 | &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ | |
799 | (__be32 *)(bp)->b_addr) | |
800 | ||
801 | /* | |
802 | * Size of the AGFL. For CRC-enabled filesystes we steal a couple of | |
803 | * slots in the beginning of the block for a proper header with the | |
804 | * location information and CRC. | |
805 | */ | |
806 | #define XFS_AGFL_SIZE(mp) \ | |
807 | (((mp)->m_sb.sb_sectsize - \ | |
808 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
809 | sizeof(struct xfs_agfl) : 0)) / \ | |
810 | sizeof(xfs_agblock_t)) | |
811 | ||
812 | typedef struct xfs_agfl { | |
813 | __be32 agfl_magicnum; | |
814 | __be32 agfl_seqno; | |
815 | uuid_t agfl_uuid; | |
816 | __be64 agfl_lsn; | |
817 | __be32 agfl_crc; | |
818 | __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ | |
96f859d5 | 819 | } __attribute__((packed)) xfs_agfl_t; |
4fb6e8ad CH |
820 | |
821 | #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) | |
822 | ||
4fb6e8ad CH |
823 | #define XFS_AGB_TO_FSB(mp,agno,agbno) \ |
824 | (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) | |
825 | #define XFS_FSB_TO_AGNO(mp,fsbno) \ | |
826 | ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) | |
827 | #define XFS_FSB_TO_AGBNO(mp,fsbno) \ | |
828 | ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) | |
829 | #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ | |
830 | ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ | |
831 | (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) | |
832 | #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) | |
833 | ||
834 | /* | |
835 | * For checking for bad ranges of xfs_daddr_t's, covering multiple | |
836 | * allocation groups or a single xfs_daddr_t that's a superblock copy. | |
837 | */ | |
838 | #define XFS_AG_CHECK_DADDR(mp,d,len) \ | |
839 | ((len) == 1 ? \ | |
840 | ASSERT((d) == XFS_SB_DADDR || \ | |
841 | xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ | |
842 | ASSERT(xfs_daddr_to_agno(mp, d) == \ | |
843 | xfs_daddr_to_agno(mp, (d) + (len) - 1))) | |
844 | ||
6d3ebaae CH |
845 | typedef struct xfs_timestamp { |
846 | __be32 t_sec; /* timestamp seconds */ | |
847 | __be32 t_nsec; /* timestamp nanoseconds */ | |
848 | } xfs_timestamp_t; | |
849 | ||
850 | /* | |
851 | * On-disk inode structure. | |
852 | * | |
853 | * This is just the header or "dinode core", the inode is expanded to fill a | |
854 | * variable size the leftover area split into a data and an attribute fork. | |
855 | * The format of the data and attribute fork depends on the format of the | |
856 | * inode as indicated by di_format and di_aformat. To access the data and | |
857 | * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros | |
858 | * below. | |
859 | * | |
860 | * There is a very similar struct icdinode in xfs_inode which matches the | |
861 | * layout of the first 96 bytes of this structure, but is kept in native | |
862 | * format instead of big endian. | |
863 | * | |
864 | * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed | |
865 | * padding field for v3 inodes. | |
866 | */ | |
867 | #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ | |
6d3ebaae CH |
868 | typedef struct xfs_dinode { |
869 | __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ | |
870 | __be16 di_mode; /* mode and type of file */ | |
871 | __u8 di_version; /* inode version */ | |
872 | __u8 di_format; /* format of di_c data */ | |
873 | __be16 di_onlink; /* old number of links to file */ | |
874 | __be32 di_uid; /* owner's user id */ | |
875 | __be32 di_gid; /* owner's group id */ | |
876 | __be32 di_nlink; /* number of links to file */ | |
877 | __be16 di_projid_lo; /* lower part of owner's project id */ | |
878 | __be16 di_projid_hi; /* higher part owner's project id */ | |
879 | __u8 di_pad[6]; /* unused, zeroed space */ | |
880 | __be16 di_flushiter; /* incremented on flush */ | |
881 | xfs_timestamp_t di_atime; /* time last accessed */ | |
882 | xfs_timestamp_t di_mtime; /* time last modified */ | |
883 | xfs_timestamp_t di_ctime; /* time created/inode modified */ | |
884 | __be64 di_size; /* number of bytes in file */ | |
885 | __be64 di_nblocks; /* # of direct & btree blocks used */ | |
886 | __be32 di_extsize; /* basic/minimum extent size for file */ | |
887 | __be32 di_nextents; /* number of extents in data fork */ | |
888 | __be16 di_anextents; /* number of extents in attribute fork*/ | |
889 | __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ | |
890 | __s8 di_aformat; /* format of attr fork's data */ | |
891 | __be32 di_dmevmask; /* DMIG event mask */ | |
892 | __be16 di_dmstate; /* DMIG state info */ | |
893 | __be16 di_flags; /* random flags, XFS_DIFLAG_... */ | |
894 | __be32 di_gen; /* generation number */ | |
895 | ||
896 | /* di_next_unlinked is the only non-core field in the old dinode */ | |
897 | __be32 di_next_unlinked;/* agi unlinked list ptr */ | |
898 | ||
899 | /* start of the extended dinode, writable fields */ | |
900 | __le32 di_crc; /* CRC of the inode */ | |
901 | __be64 di_changecount; /* number of attribute changes */ | |
902 | __be64 di_lsn; /* flush sequence */ | |
903 | __be64 di_flags2; /* more random flags */ | |
f7ca3522 DW |
904 | __be32 di_cowextsize; /* basic cow extent size for file */ |
905 | __u8 di_pad2[12]; /* more padding for future expansion */ | |
6d3ebaae CH |
906 | |
907 | /* fields only written to during inode creation */ | |
908 | xfs_timestamp_t di_crtime; /* time created */ | |
909 | __be64 di_ino; /* inode number */ | |
910 | uuid_t di_uuid; /* UUID of the filesystem */ | |
911 | ||
912 | /* structure must be padded to 64 bit alignment */ | |
913 | } xfs_dinode_t; | |
914 | ||
915 | #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) | |
916 | ||
917 | #define DI_MAX_FLUSH 0xffff | |
918 | ||
919 | /* | |
920 | * Size of the core inode on disk. Version 1 and 2 inodes have | |
921 | * the same size, but version 3 has grown a few additional fields. | |
922 | */ | |
923 | static inline uint xfs_dinode_size(int version) | |
924 | { | |
925 | if (version == 3) | |
926 | return sizeof(struct xfs_dinode); | |
927 | return offsetof(struct xfs_dinode, di_crc); | |
928 | } | |
929 | ||
930 | /* | |
931 | * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. | |
932 | * Since the pathconf interface is signed, we use 2^31 - 1 instead. | |
933 | * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. | |
934 | */ | |
935 | #define XFS_MAXLINK ((1U << 31) - 1U) | |
936 | #define XFS_MAXLINK_1 65535U | |
937 | ||
938 | /* | |
939 | * Values for di_format | |
940 | */ | |
941 | typedef enum xfs_dinode_fmt { | |
942 | XFS_DINODE_FMT_DEV, /* xfs_dev_t */ | |
943 | XFS_DINODE_FMT_LOCAL, /* bulk data */ | |
944 | XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ | |
945 | XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ | |
946 | XFS_DINODE_FMT_UUID /* uuid_t */ | |
947 | } xfs_dinode_fmt_t; | |
948 | ||
949 | /* | |
950 | * Inode minimum and maximum sizes. | |
951 | */ | |
952 | #define XFS_DINODE_MIN_LOG 8 | |
953 | #define XFS_DINODE_MAX_LOG 11 | |
954 | #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) | |
955 | #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) | |
956 | ||
957 | /* | |
958 | * Inode size for given fs. | |
959 | */ | |
960 | #define XFS_LITINO(mp, version) \ | |
961 | ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) | |
962 | ||
963 | /* | |
964 | * Inode data & attribute fork sizes, per inode. | |
965 | */ | |
966 | #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) | |
967 | #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) | |
968 | ||
969 | #define XFS_DFORK_DSIZE(dip,mp) \ | |
970 | (XFS_DFORK_Q(dip) ? \ | |
971 | XFS_DFORK_BOFF(dip) : \ | |
972 | XFS_LITINO(mp, (dip)->di_version)) | |
973 | #define XFS_DFORK_ASIZE(dip,mp) \ | |
974 | (XFS_DFORK_Q(dip) ? \ | |
975 | XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ | |
976 | 0) | |
977 | #define XFS_DFORK_SIZE(dip,mp,w) \ | |
978 | ((w) == XFS_DATA_FORK ? \ | |
979 | XFS_DFORK_DSIZE(dip, mp) : \ | |
980 | XFS_DFORK_ASIZE(dip, mp)) | |
981 | ||
982 | /* | |
983 | * Return pointers to the data or attribute forks. | |
984 | */ | |
985 | #define XFS_DFORK_DPTR(dip) \ | |
986 | ((char *)dip + xfs_dinode_size(dip->di_version)) | |
987 | #define XFS_DFORK_APTR(dip) \ | |
988 | (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) | |
989 | #define XFS_DFORK_PTR(dip,w) \ | |
990 | ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) | |
991 | ||
992 | #define XFS_DFORK_FORMAT(dip,w) \ | |
993 | ((w) == XFS_DATA_FORK ? \ | |
994 | (dip)->di_format : \ | |
995 | (dip)->di_aformat) | |
996 | #define XFS_DFORK_NEXTENTS(dip,w) \ | |
997 | ((w) == XFS_DATA_FORK ? \ | |
998 | be32_to_cpu((dip)->di_nextents) : \ | |
999 | be16_to_cpu((dip)->di_anextents)) | |
1000 | ||
1001 | /* | |
1002 | * For block and character special files the 32bit dev_t is stored at the | |
1003 | * beginning of the data fork. | |
1004 | */ | |
1005 | static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) | |
1006 | { | |
1007 | return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); | |
1008 | } | |
1009 | ||
1010 | static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) | |
1011 | { | |
1012 | *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Values for di_flags | |
6d3ebaae CH |
1017 | */ |
1018 | #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ | |
1019 | #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ | |
1020 | #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ | |
1021 | #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ | |
1022 | #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ | |
1023 | #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ | |
1024 | #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ | |
1025 | #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ | |
1026 | #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ | |
1027 | #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ | |
1028 | #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ | |
1029 | #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ | |
1030 | #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ | |
1031 | #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ | |
1032 | #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ | |
1033 | #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) | |
1034 | #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) | |
1035 | #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) | |
1036 | #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) | |
1037 | #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) | |
1038 | #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) | |
1039 | #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) | |
1040 | #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) | |
1041 | #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) | |
1042 | #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) | |
1043 | #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) | |
1044 | #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) | |
1045 | #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) | |
1046 | #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) | |
1047 | #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) | |
1048 | ||
1049 | #define XFS_DIFLAG_ANY \ | |
1050 | (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ | |
1051 | XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ | |
1052 | XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ | |
1053 | XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ | |
1054 | XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) | |
1055 | ||
58f88ca2 DC |
1056 | /* |
1057 | * Values for di_flags2 These start by being exposed to userspace in the upper | |
1058 | * 16 bits of the XFS_XFLAG_s range. | |
1059 | */ | |
1060 | #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ | |
46eeb521 DW |
1061 | #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ |
1062 | #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ | |
58f88ca2 | 1063 | #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) |
46eeb521 DW |
1064 | #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) |
1065 | #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) | |
58f88ca2 | 1066 | |
46eeb521 DW |
1067 | #define XFS_DIFLAG2_ANY \ |
1068 | (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) | |
58f88ca2 | 1069 | |
508b6b3b CH |
1070 | /* |
1071 | * Inode number format: | |
1072 | * low inopblog bits - offset in block | |
1073 | * next agblklog bits - block number in ag | |
1074 | * next agno_log bits - ag number | |
1075 | * high agno_log-agblklog-inopblog bits - 0 | |
1076 | */ | |
1077 | #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) | |
1078 | #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog | |
1079 | #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog | |
1080 | #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log | |
1081 | #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log | |
1082 | #define XFS_INO_BITS(mp) \ | |
1083 | XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) | |
1084 | #define XFS_INO_TO_AGNO(mp,i) \ | |
1085 | ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) | |
1086 | #define XFS_INO_TO_AGINO(mp,i) \ | |
1087 | ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) | |
1088 | #define XFS_INO_TO_AGBNO(mp,i) \ | |
1089 | (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ | |
1090 | XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) | |
1091 | #define XFS_INO_TO_OFFSET(mp,i) \ | |
1092 | ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) | |
1093 | #define XFS_INO_TO_FSB(mp,i) \ | |
1094 | XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) | |
1095 | #define XFS_AGINO_TO_INO(mp,a,i) \ | |
1096 | (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) | |
1097 | #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) | |
1098 | #define XFS_AGINO_TO_OFFSET(mp,i) \ | |
1099 | ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) | |
1100 | #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ | |
1101 | ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) | |
1102 | ||
1103 | #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) | |
1104 | #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) | |
6d3ebaae | 1105 | |
c7298202 DC |
1106 | /* |
1107 | * RealTime Device format definitions | |
1108 | */ | |
1109 | ||
1110 | /* Min and max rt extent sizes, specified in bytes */ | |
1111 | #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ | |
1112 | #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ | |
1113 | #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ | |
1114 | ||
1115 | #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) | |
1116 | #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) | |
1117 | #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) | |
1118 | #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) | |
1119 | ||
1120 | /* | |
1121 | * RT Summary and bit manipulation macros. | |
1122 | */ | |
1123 | #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) | |
1124 | #define XFS_SUMOFFSTOBLOCK(mp,s) \ | |
1125 | (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) | |
1126 | #define XFS_SUMPTR(mp,bp,so) \ | |
1127 | ((xfs_suminfo_t *)((bp)->b_addr + \ | |
1128 | (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) | |
1129 | ||
1130 | #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) | |
1131 | #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) | |
1132 | #define XFS_BITTOWORD(mp,bi) \ | |
1133 | ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) | |
1134 | ||
1135 | #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) | |
1136 | #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) | |
1137 | ||
1138 | #define XFS_RTLOBIT(w) xfs_lowbit32(w) | |
1139 | #define XFS_RTHIBIT(w) xfs_highbit32(w) | |
1140 | ||
c7298202 | 1141 | #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) |
c7298202 | 1142 | |
6ca1c906 DC |
1143 | /* |
1144 | * Dquot and dquot block format definitions | |
1145 | */ | |
1146 | #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ | |
1147 | #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ | |
1148 | ||
1149 | /* | |
1150 | * This is the main portion of the on-disk representation of quota | |
1151 | * information for a user. This is the q_core of the xfs_dquot_t that | |
1152 | * is kept in kernel memory. We pad this with some more expansion room | |
1153 | * to construct the on disk structure. | |
1154 | */ | |
1155 | typedef struct xfs_disk_dquot { | |
1156 | __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ | |
1157 | __u8 d_version; /* dquot version */ | |
1158 | __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ | |
1159 | __be32 d_id; /* user,project,group id */ | |
1160 | __be64 d_blk_hardlimit;/* absolute limit on disk blks */ | |
1161 | __be64 d_blk_softlimit;/* preferred limit on disk blks */ | |
1162 | __be64 d_ino_hardlimit;/* maximum # allocated inodes */ | |
1163 | __be64 d_ino_softlimit;/* preferred inode limit */ | |
1164 | __be64 d_bcount; /* disk blocks owned by the user */ | |
1165 | __be64 d_icount; /* inodes owned by the user */ | |
1166 | __be32 d_itimer; /* zero if within inode limits if not, | |
1167 | this is when we refuse service */ | |
1168 | __be32 d_btimer; /* similar to above; for disk blocks */ | |
1169 | __be16 d_iwarns; /* warnings issued wrt num inodes */ | |
1170 | __be16 d_bwarns; /* warnings issued wrt disk blocks */ | |
1171 | __be32 d_pad0; /* 64 bit align */ | |
1172 | __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ | |
1173 | __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ | |
1174 | __be64 d_rtbcount; /* realtime blocks owned */ | |
1175 | __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ | |
1176 | __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ | |
1177 | __be16 d_pad; | |
1178 | } xfs_disk_dquot_t; | |
1179 | ||
1180 | /* | |
1181 | * This is what goes on disk. This is separated from the xfs_disk_dquot because | |
1182 | * carrying the unnecessary padding would be a waste of memory. | |
1183 | */ | |
1184 | typedef struct xfs_dqblk { | |
1185 | xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ | |
1186 | char dd_fill[4]; /* filling for posterity */ | |
1187 | ||
1188 | /* | |
1189 | * These two are only present on filesystems with the CRC bits set. | |
1190 | */ | |
1191 | __be32 dd_crc; /* checksum */ | |
1192 | __be64 dd_lsn; /* last modification in log */ | |
1193 | uuid_t dd_uuid; /* location information */ | |
1194 | } xfs_dqblk_t; | |
1195 | ||
1196 | #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) | |
1197 | ||
1fb7e48d DC |
1198 | /* |
1199 | * Remote symlink format and access functions. | |
1200 | */ | |
1201 | #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ | |
1202 | ||
1203 | struct xfs_dsymlink_hdr { | |
1204 | __be32 sl_magic; | |
1205 | __be32 sl_offset; | |
1206 | __be32 sl_bytes; | |
1207 | __be32 sl_crc; | |
1208 | uuid_t sl_uuid; | |
1209 | __be64 sl_owner; | |
1210 | __be64 sl_blkno; | |
1211 | __be64 sl_lsn; | |
1212 | }; | |
1213 | ||
533b81c8 ES |
1214 | #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) |
1215 | ||
1fb7e48d DC |
1216 | /* |
1217 | * The maximum pathlen is 1024 bytes. Since the minimum file system | |
1218 | * blocksize is 512 bytes, we can get a max of 3 extents back from | |
1219 | * bmapi when crc headers are taken into account. | |
1220 | */ | |
1221 | #define XFS_SYMLINK_MAPS 3 | |
1222 | ||
1223 | #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ | |
1224 | ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ | |
1225 | sizeof(struct xfs_dsymlink_hdr) : 0)) | |
1226 | ||
a4fbe6ab DC |
1227 | |
1228 | /* | |
1229 | * Allocation Btree format definitions | |
1230 | * | |
1231 | * There are two on-disk btrees, one sorted by blockno and one sorted | |
1232 | * by blockcount and blockno. All blocks look the same to make the code | |
1233 | * simpler; if we have time later, we'll make the optimizations. | |
1234 | */ | |
1235 | #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ | |
1236 | #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ | |
1237 | #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ | |
1238 | #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ | |
1239 | ||
1240 | /* | |
1241 | * Data record/key structure | |
1242 | */ | |
1243 | typedef struct xfs_alloc_rec { | |
1244 | __be32 ar_startblock; /* starting block number */ | |
1245 | __be32 ar_blockcount; /* count of free blocks */ | |
1246 | } xfs_alloc_rec_t, xfs_alloc_key_t; | |
1247 | ||
1248 | typedef struct xfs_alloc_rec_incore { | |
1249 | xfs_agblock_t ar_startblock; /* starting block number */ | |
1250 | xfs_extlen_t ar_blockcount; /* count of free blocks */ | |
1251 | } xfs_alloc_rec_incore_t; | |
1252 | ||
1253 | /* btree pointer type */ | |
1254 | typedef __be32 xfs_alloc_ptr_t; | |
1255 | ||
1256 | /* | |
1257 | * Block numbers in the AG: | |
1258 | * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. | |
1259 | */ | |
1260 | #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) | |
1261 | #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) | |
1262 | ||
1263 | ||
1264 | /* | |
1265 | * Inode Allocation Btree format definitions | |
1266 | * | |
1267 | * There is a btree for the inode map per allocation group. | |
1268 | */ | |
1269 | #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ | |
1270 | #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ | |
aafc3c24 BF |
1271 | #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ |
1272 | #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ | |
a4fbe6ab DC |
1273 | |
1274 | typedef __uint64_t xfs_inofree_t; | |
1275 | #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) | |
1276 | #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) | |
1277 | #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) | |
1278 | #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) | |
1279 | ||
5419040f BF |
1280 | #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ |
1281 | #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) | |
1282 | #define XFS_INODES_PER_HOLEMASK_BIT \ | |
1283 | (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) | |
1284 | ||
a4fbe6ab DC |
1285 | static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) |
1286 | { | |
1287 | return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; | |
1288 | } | |
1289 | ||
1290 | /* | |
5419040f BF |
1291 | * The on-disk inode record structure has two formats. The original "full" |
1292 | * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount | |
1293 | * and replaces the 3 high-order freecount bytes wth the holemask and inode | |
1294 | * count. | |
1295 | * | |
1296 | * The holemask of the sparse record format allows an inode chunk to have holes | |
1297 | * that refer to blocks not owned by the inode record. This facilitates inode | |
1298 | * allocation in the event of severe free space fragmentation. | |
a4fbe6ab DC |
1299 | */ |
1300 | typedef struct xfs_inobt_rec { | |
1301 | __be32 ir_startino; /* starting inode number */ | |
5419040f BF |
1302 | union { |
1303 | struct { | |
1304 | __be32 ir_freecount; /* count of free inodes */ | |
1305 | } f; | |
1306 | struct { | |
1307 | __be16 ir_holemask;/* hole mask for sparse chunks */ | |
1308 | __u8 ir_count; /* total inode count */ | |
1309 | __u8 ir_freecount; /* count of free inodes */ | |
1310 | } sp; | |
1311 | } ir_u; | |
a4fbe6ab DC |
1312 | __be64 ir_free; /* free inode mask */ |
1313 | } xfs_inobt_rec_t; | |
1314 | ||
1315 | typedef struct xfs_inobt_rec_incore { | |
1316 | xfs_agino_t ir_startino; /* starting inode number */ | |
5419040f BF |
1317 | __uint16_t ir_holemask; /* hole mask for sparse chunks */ |
1318 | __uint8_t ir_count; /* total inode count */ | |
1319 | __uint8_t ir_freecount; /* count of free inodes (set bits) */ | |
a4fbe6ab DC |
1320 | xfs_inofree_t ir_free; /* free inode mask */ |
1321 | } xfs_inobt_rec_incore_t; | |
1322 | ||
5419040f BF |
1323 | static inline bool xfs_inobt_issparse(uint16_t holemask) |
1324 | { | |
1325 | /* non-zero holemask represents a sparse rec. */ | |
1326 | return holemask; | |
1327 | } | |
a4fbe6ab DC |
1328 | |
1329 | /* | |
1330 | * Key structure | |
1331 | */ | |
1332 | typedef struct xfs_inobt_key { | |
1333 | __be32 ir_startino; /* starting inode number */ | |
1334 | } xfs_inobt_key_t; | |
1335 | ||
1336 | /* btree pointer type */ | |
1337 | typedef __be32 xfs_inobt_ptr_t; | |
1338 | ||
1339 | /* | |
1340 | * block numbers in the AG. | |
1341 | */ | |
1342 | #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) | |
aafc3c24 BF |
1343 | #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) |
1344 | ||
b8704944 DW |
1345 | /* |
1346 | * Reverse mapping btree format definitions | |
1347 | * | |
1348 | * There is a btree for the reverse map per allocation group | |
1349 | */ | |
1350 | #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ | |
1351 | ||
340785cc DW |
1352 | /* |
1353 | * Ownership info for an extent. This is used to create reverse-mapping | |
1354 | * entries. | |
1355 | */ | |
1356 | #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) | |
1357 | #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) | |
1358 | struct xfs_owner_info { | |
1359 | uint64_t oi_owner; | |
1360 | xfs_fileoff_t oi_offset; | |
1361 | unsigned int oi_flags; | |
1362 | }; | |
1363 | ||
1364 | /* | |
1365 | * Special owner types. | |
1366 | * | |
1367 | * Seeing as we only support up to 8EB, we have the upper bit of the owner field | |
1368 | * to tell us we have a special owner value. We use these for static metadata | |
1369 | * allocated at mkfs/growfs time, as well as for freespace management metadata. | |
1370 | */ | |
1371 | #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ | |
1372 | #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ | |
1373 | #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ | |
1374 | #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ | |
1375 | #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ | |
1376 | #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ | |
1377 | #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ | |
46eeb521 | 1378 | #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ |
174edb0e DW |
1379 | #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ |
1380 | #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ | |
340785cc | 1381 | |
035e00ac DW |
1382 | #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) |
1383 | ||
1384 | /* | |
1385 | * Data record structure | |
1386 | */ | |
1387 | struct xfs_rmap_rec { | |
1388 | __be32 rm_startblock; /* extent start block */ | |
1389 | __be32 rm_blockcount; /* extent length */ | |
1390 | __be64 rm_owner; /* extent owner */ | |
1391 | __be64 rm_offset; /* offset within the owner */ | |
1392 | }; | |
1393 | ||
1394 | /* | |
1395 | * rmap btree record | |
1396 | * rm_offset:63 is the attribute fork flag | |
1397 | * rm_offset:62 is the bmbt block flag | |
1398 | * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) | |
1399 | * rm_offset:54-60 aren't used and should be zero | |
1400 | * rm_offset:0-53 is the block offset within the inode | |
1401 | */ | |
1402 | #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) | |
1403 | #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) | |
1404 | #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) | |
1405 | ||
1406 | #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) | |
1407 | #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ | |
1408 | XFS_RMAP_OFF_BMBT_BLOCK | \ | |
1409 | XFS_RMAP_OFF_UNWRITTEN) | |
1410 | #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) | |
1411 | ||
1412 | #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) | |
1413 | ||
1414 | #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) | |
1415 | #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) | |
1416 | #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) | |
1417 | ||
1418 | #define RMAPBT_STARTBLOCK_BITLEN 32 | |
1419 | #define RMAPBT_BLOCKCOUNT_BITLEN 32 | |
1420 | #define RMAPBT_OWNER_BITLEN 64 | |
1421 | #define RMAPBT_ATTRFLAG_BITLEN 1 | |
1422 | #define RMAPBT_BMBTFLAG_BITLEN 1 | |
1423 | #define RMAPBT_EXNTFLAG_BITLEN 1 | |
1424 | #define RMAPBT_UNUSED_OFFSET_BITLEN 7 | |
1425 | #define RMAPBT_OFFSET_BITLEN 54 | |
1426 | ||
1427 | #define XFS_RMAP_ATTR_FORK (1 << 0) | |
1428 | #define XFS_RMAP_BMBT_BLOCK (1 << 1) | |
1429 | #define XFS_RMAP_UNWRITTEN (1 << 2) | |
1430 | #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ | |
1431 | XFS_RMAP_BMBT_BLOCK) | |
1432 | #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) | |
1433 | struct xfs_rmap_irec { | |
1434 | xfs_agblock_t rm_startblock; /* extent start block */ | |
1435 | xfs_extlen_t rm_blockcount; /* extent length */ | |
1436 | __uint64_t rm_owner; /* extent owner */ | |
1437 | __uint64_t rm_offset; /* offset within the owner */ | |
1438 | unsigned int rm_flags; /* state flags */ | |
1439 | }; | |
1440 | ||
1441 | /* | |
1442 | * Key structure | |
1443 | * | |
1444 | * We don't use the length for lookups | |
1445 | */ | |
1446 | struct xfs_rmap_key { | |
1447 | __be32 rm_startblock; /* extent start block */ | |
1448 | __be64 rm_owner; /* extent owner */ | |
1449 | __be64 rm_offset; /* offset within the owner */ | |
1450 | } __attribute__((packed)); | |
1451 | ||
1452 | /* btree pointer type */ | |
1453 | typedef __be32 xfs_rmap_ptr_t; | |
1454 | ||
8018026e | 1455 | #define XFS_RMAP_BLOCK(mp) \ |
aafc3c24 BF |
1456 | (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ |
1457 | XFS_FIBT_BLOCK(mp) + 1 : \ | |
1458 | XFS_IBT_BLOCK(mp) + 1) | |
a4fbe6ab | 1459 | |
46eeb521 DW |
1460 | /* |
1461 | * Reference Count Btree format definitions | |
1462 | * | |
1463 | */ | |
1464 | #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ | |
1465 | ||
af30dfa1 DW |
1466 | unsigned int xfs_refc_block(struct xfs_mount *mp); |
1467 | ||
1946b91c DW |
1468 | /* |
1469 | * Data record/key structure | |
1470 | * | |
1471 | * Each record associates a range of physical blocks (starting at | |
1472 | * rc_startblock and ending rc_blockcount blocks later) with a reference | |
1473 | * count (rc_refcount). Extents that are being used to stage a copy on | |
1474 | * write (CoW) operation are recorded in the refcount btree with a | |
1475 | * refcount of 1. All other records must have a refcount > 1 and must | |
1476 | * track an extent mapped only by file data forks. | |
1477 | * | |
1478 | * Extents with a single owner (attributes, metadata, non-shared file | |
1479 | * data) are not tracked here. Free space is also not tracked here. | |
1480 | * This is consistent with pre-reflink XFS. | |
1481 | */ | |
174edb0e DW |
1482 | |
1483 | /* | |
1484 | * Extents that are being used to stage a copy on write are stored | |
1485 | * in the refcount btree with a refcount of 1 and the upper bit set | |
1486 | * on the startblock. This speeds up mount time deletion of stale | |
1487 | * staging extents because they're all at the right side of the tree. | |
1488 | */ | |
1489 | #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) | |
1490 | #define REFCNTBT_COWFLAG_BITLEN 1 | |
1491 | #define REFCNTBT_AGBLOCK_BITLEN 31 | |
1492 | ||
1946b91c DW |
1493 | struct xfs_refcount_rec { |
1494 | __be32 rc_startblock; /* starting block number */ | |
1495 | __be32 rc_blockcount; /* count of blocks */ | |
1496 | __be32 rc_refcount; /* number of inodes linked here */ | |
1497 | }; | |
1498 | ||
1499 | struct xfs_refcount_key { | |
1500 | __be32 rc_startblock; /* starting block number */ | |
1501 | }; | |
1502 | ||
1503 | struct xfs_refcount_irec { | |
1504 | xfs_agblock_t rc_startblock; /* starting block number */ | |
1505 | xfs_extlen_t rc_blockcount; /* count of free blocks */ | |
1506 | xfs_nlink_t rc_refcount; /* number of inodes linked here */ | |
1507 | }; | |
1508 | ||
1509 | #define MAXREFCOUNT ((xfs_nlink_t)~0U) | |
1510 | #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) | |
1511 | ||
1512 | /* btree pointer type */ | |
1513 | typedef __be32 xfs_refcount_ptr_t; | |
1514 | ||
46eeb521 | 1515 | |
a4fbe6ab DC |
1516 | /* |
1517 | * BMAP Btree format definitions | |
1518 | * | |
1519 | * This includes both the root block definition that sits inside an inode fork | |
1520 | * and the record/pointer formats for the leaf/node in the blocks. | |
1521 | */ | |
1522 | #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ | |
1523 | #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ | |
1524 | ||
1525 | /* | |
1526 | * Bmap root header, on-disk form only. | |
1527 | */ | |
1528 | typedef struct xfs_bmdr_block { | |
1529 | __be16 bb_level; /* 0 is a leaf */ | |
1530 | __be16 bb_numrecs; /* current # of data records */ | |
1531 | } xfs_bmdr_block_t; | |
1532 | ||
1533 | /* | |
1534 | * Bmap btree record and extent descriptor. | |
1535 | * l0:63 is an extent flag (value 1 indicates non-normal). | |
1536 | * l0:9-62 are startoff. | |
1537 | * l0:0-8 and l1:21-63 are startblock. | |
1538 | * l1:0-20 are blockcount. | |
1539 | */ | |
1540 | #define BMBT_EXNTFLAG_BITLEN 1 | |
1541 | #define BMBT_STARTOFF_BITLEN 54 | |
1542 | #define BMBT_STARTBLOCK_BITLEN 52 | |
1543 | #define BMBT_BLOCKCOUNT_BITLEN 21 | |
1544 | ||
1545 | typedef struct xfs_bmbt_rec { | |
1546 | __be64 l0, l1; | |
1547 | } xfs_bmbt_rec_t; | |
1548 | ||
1549 | typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ | |
1550 | typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; | |
1551 | ||
1552 | typedef struct xfs_bmbt_rec_host { | |
1553 | __uint64_t l0, l1; | |
1554 | } xfs_bmbt_rec_host_t; | |
1555 | ||
1556 | /* | |
1557 | * Values and macros for delayed-allocation startblock fields. | |
1558 | */ | |
1559 | #define STARTBLOCKVALBITS 17 | |
d5cf09ba | 1560 | #define STARTBLOCKMASKBITS (15 + 20) |
a4fbe6ab DC |
1561 | #define STARTBLOCKMASK \ |
1562 | (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) | |
a4fbe6ab DC |
1563 | |
1564 | static inline int isnullstartblock(xfs_fsblock_t x) | |
1565 | { | |
1566 | return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; | |
1567 | } | |
1568 | ||
a4fbe6ab DC |
1569 | static inline xfs_fsblock_t nullstartblock(int k) |
1570 | { | |
1571 | ASSERT(k < (1 << STARTBLOCKVALBITS)); | |
1572 | return STARTBLOCKMASK | (k); | |
1573 | } | |
1574 | ||
1575 | static inline xfs_filblks_t startblockval(xfs_fsblock_t x) | |
1576 | { | |
1577 | return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Possible extent formats. | |
1582 | */ | |
1583 | typedef enum { | |
1584 | XFS_EXTFMT_NOSTATE = 0, | |
1585 | XFS_EXTFMT_HASSTATE | |
1586 | } xfs_exntfmt_t; | |
1587 | ||
1588 | /* | |
1589 | * Possible extent states. | |
1590 | */ | |
1591 | typedef enum { | |
1592 | XFS_EXT_NORM, XFS_EXT_UNWRITTEN, | |
1593 | XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID | |
1594 | } xfs_exntst_t; | |
1595 | ||
1596 | /* | |
1597 | * Incore version of above. | |
1598 | */ | |
1599 | typedef struct xfs_bmbt_irec | |
1600 | { | |
1601 | xfs_fileoff_t br_startoff; /* starting file offset */ | |
1602 | xfs_fsblock_t br_startblock; /* starting block number */ | |
1603 | xfs_filblks_t br_blockcount; /* number of blocks */ | |
1604 | xfs_exntst_t br_state; /* extent state */ | |
1605 | } xfs_bmbt_irec_t; | |
1606 | ||
1607 | /* | |
1608 | * Key structure for non-leaf levels of the tree. | |
1609 | */ | |
1610 | typedef struct xfs_bmbt_key { | |
1611 | __be64 br_startoff; /* starting file offset */ | |
1612 | } xfs_bmbt_key_t, xfs_bmdr_key_t; | |
1613 | ||
1614 | /* btree pointer type */ | |
1615 | typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; | |
1616 | ||
1617 | ||
1618 | /* | |
1619 | * Generic Btree block format definitions | |
1620 | * | |
1621 | * This is a combination of the actual format used on disk for short and long | |
1622 | * format btrees. The first three fields are shared by both format, but the | |
1623 | * pointers are different and should be used with care. | |
1624 | * | |
1625 | * To get the size of the actual short or long form headers please use the size | |
1626 | * macros below. Never use sizeof(xfs_btree_block). | |
1627 | * | |
1628 | * The blkno, crc, lsn, owner and uuid fields are only available in filesystems | |
1629 | * with the crc feature bit, and all accesses to them must be conditional on | |
1630 | * that flag. | |
1631 | */ | |
ad70328a HT |
1632 | /* short form block header */ |
1633 | struct xfs_btree_block_shdr { | |
1634 | __be32 bb_leftsib; | |
1635 | __be32 bb_rightsib; | |
1636 | ||
1637 | __be64 bb_blkno; | |
1638 | __be64 bb_lsn; | |
1639 | uuid_t bb_uuid; | |
1640 | __be32 bb_owner; | |
1641 | __le32 bb_crc; | |
1642 | }; | |
1643 | ||
1644 | /* long form block header */ | |
1645 | struct xfs_btree_block_lhdr { | |
1646 | __be64 bb_leftsib; | |
1647 | __be64 bb_rightsib; | |
1648 | ||
1649 | __be64 bb_blkno; | |
1650 | __be64 bb_lsn; | |
1651 | uuid_t bb_uuid; | |
1652 | __be64 bb_owner; | |
1653 | __le32 bb_crc; | |
1654 | __be32 bb_pad; /* padding for alignment */ | |
1655 | }; | |
1656 | ||
a4fbe6ab DC |
1657 | struct xfs_btree_block { |
1658 | __be32 bb_magic; /* magic number for block type */ | |
1659 | __be16 bb_level; /* 0 is a leaf */ | |
1660 | __be16 bb_numrecs; /* current # of data records */ | |
1661 | union { | |
ad70328a HT |
1662 | struct xfs_btree_block_shdr s; |
1663 | struct xfs_btree_block_lhdr l; | |
a4fbe6ab DC |
1664 | } bb_u; /* rest */ |
1665 | }; | |
1666 | ||
ad70328a HT |
1667 | /* size of a short form block */ |
1668 | #define XFS_BTREE_SBLOCK_LEN \ | |
1669 | (offsetof(struct xfs_btree_block, bb_u) + \ | |
1670 | offsetof(struct xfs_btree_block_shdr, bb_blkno)) | |
1671 | /* size of a long form block */ | |
1672 | #define XFS_BTREE_LBLOCK_LEN \ | |
1673 | (offsetof(struct xfs_btree_block, bb_u) + \ | |
1674 | offsetof(struct xfs_btree_block_lhdr, bb_blkno)) | |
a4fbe6ab DC |
1675 | |
1676 | /* sizes of CRC enabled btree blocks */ | |
ad70328a HT |
1677 | #define XFS_BTREE_SBLOCK_CRC_LEN \ |
1678 | (offsetof(struct xfs_btree_block, bb_u) + \ | |
1679 | sizeof(struct xfs_btree_block_shdr)) | |
1680 | #define XFS_BTREE_LBLOCK_CRC_LEN \ | |
1681 | (offsetof(struct xfs_btree_block, bb_u) + \ | |
1682 | sizeof(struct xfs_btree_block_lhdr)) | |
a4fbe6ab DC |
1683 | |
1684 | #define XFS_BTREE_SBLOCK_CRC_OFF \ | |
1685 | offsetof(struct xfs_btree_block, bb_u.s.bb_crc) | |
1686 | #define XFS_BTREE_LBLOCK_CRC_OFF \ | |
1687 | offsetof(struct xfs_btree_block, bb_u.l.bb_crc) | |
1688 | ||
5beda58b CH |
1689 | /* |
1690 | * On-disk XFS access control list structure. | |
1691 | */ | |
1692 | struct xfs_acl_entry { | |
1693 | __be32 ae_tag; | |
1694 | __be32 ae_id; | |
1695 | __be16 ae_perm; | |
1696 | __be16 ae_pad; /* fill the implicit hole in the structure */ | |
1697 | }; | |
1698 | ||
1699 | struct xfs_acl { | |
1700 | __be32 acl_cnt; | |
1701 | struct xfs_acl_entry acl_entry[0]; | |
1702 | }; | |
1703 | ||
1704 | /* | |
1705 | * The number of ACL entries allowed is defined by the on-disk format. | |
1706 | * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is | |
1707 | * limited only by the maximum size of the xattr that stores the information. | |
1708 | */ | |
1709 | #define XFS_ACL_MAX_ENTRIES(mp) \ | |
1710 | (xfs_sb_version_hascrc(&mp->m_sb) \ | |
51fcbfe7 | 1711 | ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ |
5beda58b CH |
1712 | sizeof(struct xfs_acl_entry) \ |
1713 | : 25) | |
1714 | ||
86a21c79 | 1715 | #define XFS_ACL_SIZE(cnt) \ |
5beda58b | 1716 | (sizeof(struct xfs_acl) + \ |
86a21c79 AG |
1717 | sizeof(struct xfs_acl_entry) * cnt) |
1718 | ||
1719 | #define XFS_ACL_MAX_SIZE(mp) \ | |
1720 | XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) | |
1721 | ||
5beda58b CH |
1722 | |
1723 | /* On-disk XFS extended attribute names */ | |
39e56d92 ES |
1724 | #define SGI_ACL_FILE "SGI_ACL_FILE" |
1725 | #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" | |
5beda58b CH |
1726 | #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) |
1727 | #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) | |
1728 | ||
6ca1c906 | 1729 | #endif /* __XFS_FORMAT_H__ */ |