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_SB_H__
19 #define __XFS_SB_H__
20
21 /*
22 * Super block
23 * Fits into a sector-sized buffer at address 0 of each allocation group.
24 * Only the first of these is ever updated except during growfs.
25 */
26
27 struct xfs_buf;
28 struct xfs_mount;
29
30 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
31 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
32 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
33 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
34 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
35 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
36 #define XFS_SB_VERSION_NUMBITS 0x000f
37 #define XFS_SB_VERSION_ALLFBITS 0xfff0
38 #define XFS_SB_VERSION_SASHFBITS 0xf000
39 #define XFS_SB_VERSION_REALFBITS 0x0ff0
40 #define XFS_SB_VERSION_ATTRBIT 0x0010
41 #define XFS_SB_VERSION_NLINKBIT 0x0020
42 #define XFS_SB_VERSION_QUOTABIT 0x0040
43 #define XFS_SB_VERSION_ALIGNBIT 0x0080
44 #define XFS_SB_VERSION_DALIGNBIT 0x0100
45 #define XFS_SB_VERSION_SHAREDBIT 0x0200
46 #define XFS_SB_VERSION_LOGV2BIT 0x0400
47 #define XFS_SB_VERSION_SECTORBIT 0x0800
48 #define XFS_SB_VERSION_EXTFLGBIT 0x1000
49 #define XFS_SB_VERSION_DIRV2BIT 0x2000
50 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
51 #define XFS_SB_VERSION_MOREBITSBIT 0x8000
52 #define XFS_SB_VERSION_OKSASHFBITS \
53 (XFS_SB_VERSION_EXTFLGBIT | \
54 XFS_SB_VERSION_DIRV2BIT | \
55 XFS_SB_VERSION_BORGBIT)
56 #define XFS_SB_VERSION_OKREALFBITS \
57 (XFS_SB_VERSION_ATTRBIT | \
58 XFS_SB_VERSION_NLINKBIT | \
59 XFS_SB_VERSION_QUOTABIT | \
60 XFS_SB_VERSION_ALIGNBIT | \
61 XFS_SB_VERSION_DALIGNBIT | \
62 XFS_SB_VERSION_SHAREDBIT | \
63 XFS_SB_VERSION_LOGV2BIT | \
64 XFS_SB_VERSION_SECTORBIT | \
65 XFS_SB_VERSION_MOREBITSBIT)
66 #define XFS_SB_VERSION_OKREALBITS \
67 (XFS_SB_VERSION_NUMBITS | \
68 XFS_SB_VERSION_OKREALFBITS | \
69 XFS_SB_VERSION_OKSASHFBITS)
70
71 /*
72 * There are two words to hold XFS "feature" bits: the original
73 * word, sb_versionnum, and sb_features2. Whenever a bit is set in
74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
75 *
76 * These defines represent bits in sb_features2.
77 */
78 #define XFS_SB_VERSION2_REALFBITS 0x00ffffff /* Mask: features */
79 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
80 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
81 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
82 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
83 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
84 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
85 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
86
87 #define XFS_SB_VERSION2_OKREALFBITS \
88 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
89 XFS_SB_VERSION2_ATTR2BIT | \
90 XFS_SB_VERSION2_PROJID32BIT)
91 #define XFS_SB_VERSION2_OKSASHFBITS \
92 (0)
93 #define XFS_SB_VERSION2_OKREALBITS \
94 (XFS_SB_VERSION2_OKREALFBITS | \
95 XFS_SB_VERSION2_OKSASHFBITS )
96
97 /*
98 * Superblock - in core version. Must match the ondisk version below.
99 * Must be padded to 64 bit alignment.
100 */
101 typedef struct xfs_sb {
102 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
103 __uint32_t sb_blocksize; /* logical block size, bytes */
104 xfs_drfsbno_t sb_dblocks; /* number of data blocks */
105 xfs_drfsbno_t sb_rblocks; /* number of realtime blocks */
106 xfs_drtbno_t sb_rextents; /* number of realtime extents */
107 uuid_t sb_uuid; /* file system unique id */
108 xfs_dfsbno_t sb_logstart; /* starting block of log if internal */
109 xfs_ino_t sb_rootino; /* root inode number */
110 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
111 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
112 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
113 xfs_agblock_t sb_agblocks; /* size of an allocation group */
114 xfs_agnumber_t sb_agcount; /* number of allocation groups */
115 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
116 xfs_extlen_t sb_logblocks; /* number of log blocks */
117 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
118 __uint16_t sb_sectsize; /* volume sector size, bytes */
119 __uint16_t sb_inodesize; /* inode size, bytes */
120 __uint16_t sb_inopblock; /* inodes per block */
121 char sb_fname[12]; /* file system name */
122 __uint8_t sb_blocklog; /* log2 of sb_blocksize */
123 __uint8_t sb_sectlog; /* log2 of sb_sectsize */
124 __uint8_t sb_inodelog; /* log2 of sb_inodesize */
125 __uint8_t sb_inopblog; /* log2 of sb_inopblock */
126 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
127 __uint8_t sb_rextslog; /* log2 of sb_rextents */
128 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
129 __uint8_t sb_imax_pct; /* max % of fs for inode space */
130 /* statistics */
131 /*
132 * These fields must remain contiguous. If you really
133 * want to change their layout, make sure you fix the
134 * code in xfs_trans_apply_sb_deltas().
135 */
136 __uint64_t sb_icount; /* allocated inodes */
137 __uint64_t sb_ifree; /* free inodes */
138 __uint64_t sb_fdblocks; /* free data blocks */
139 __uint64_t sb_frextents; /* free realtime extents */
140 /*
141 * End contiguous fields.
142 */
143 xfs_ino_t sb_uquotino; /* user quota inode */
144 xfs_ino_t sb_gquotino; /* group quota inode */
145 __uint16_t sb_qflags; /* quota flags */
146 __uint8_t sb_flags; /* misc. flags */
147 __uint8_t sb_shared_vn; /* shared version number */
148 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
149 __uint32_t sb_unit; /* stripe or raid unit */
150 __uint32_t sb_width; /* stripe or raid width */
151 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
152 __uint8_t sb_logsectlog; /* log2 of the log sector size */
153 __uint16_t sb_logsectsize; /* sector size for the log, bytes */
154 __uint32_t sb_logsunit; /* stripe unit size for the log */
155 __uint32_t sb_features2; /* additional feature bits */
156
157 /*
158 * bad features2 field as a result of failing to pad the sb
159 * structure to 64 bits. Some machines will be using this field
160 * for features2 bits. Easiest just to mark it bad and not use
161 * it for anything else.
162 */
163 __uint32_t sb_bad_features2;
164
165 /* version 5 superblock fields start here */
166
167 /* feature masks */
168 __uint32_t sb_features_compat;
169 __uint32_t sb_features_ro_compat;
170 __uint32_t sb_features_incompat;
171 __uint32_t sb_features_log_incompat;
172
173 __uint32_t sb_crc; /* superblock crc */
174 __uint32_t sb_pad;
175
176 xfs_ino_t sb_pquotino; /* project quota inode */
177 xfs_lsn_t sb_lsn; /* last write sequence */
178
179 /* must be padded to 64 bit alignment */
180 } xfs_sb_t;
181
182 /*
183 * Superblock - on disk version. Must match the in core version above.
184 * Must be padded to 64 bit alignment.
185 */
186 typedef struct xfs_dsb {
187 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
188 __be32 sb_blocksize; /* logical block size, bytes */
189 __be64 sb_dblocks; /* number of data blocks */
190 __be64 sb_rblocks; /* number of realtime blocks */
191 __be64 sb_rextents; /* number of realtime extents */
192 uuid_t sb_uuid; /* file system unique id */
193 __be64 sb_logstart; /* starting block of log if internal */
194 __be64 sb_rootino; /* root inode number */
195 __be64 sb_rbmino; /* bitmap inode for realtime extents */
196 __be64 sb_rsumino; /* summary inode for rt bitmap */
197 __be32 sb_rextsize; /* realtime extent size, blocks */
198 __be32 sb_agblocks; /* size of an allocation group */
199 __be32 sb_agcount; /* number of allocation groups */
200 __be32 sb_rbmblocks; /* number of rt bitmap blocks */
201 __be32 sb_logblocks; /* number of log blocks */
202 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */
203 __be16 sb_sectsize; /* volume sector size, bytes */
204 __be16 sb_inodesize; /* inode size, bytes */
205 __be16 sb_inopblock; /* inodes per block */
206 char sb_fname[12]; /* file system name */
207 __u8 sb_blocklog; /* log2 of sb_blocksize */
208 __u8 sb_sectlog; /* log2 of sb_sectsize */
209 __u8 sb_inodelog; /* log2 of sb_inodesize */
210 __u8 sb_inopblog; /* log2 of sb_inopblock */
211 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
212 __u8 sb_rextslog; /* log2 of sb_rextents */
213 __u8 sb_inprogress; /* mkfs is in progress, don't mount */
214 __u8 sb_imax_pct; /* max % of fs for inode space */
215 /* statistics */
216 /*
217 * These fields must remain contiguous. If you really
218 * want to change their layout, make sure you fix the
219 * code in xfs_trans_apply_sb_deltas().
220 */
221 __be64 sb_icount; /* allocated inodes */
222 __be64 sb_ifree; /* free inodes */
223 __be64 sb_fdblocks; /* free data blocks */
224 __be64 sb_frextents; /* free realtime extents */
225 /*
226 * End contiguous fields.
227 */
228 __be64 sb_uquotino; /* user quota inode */
229 __be64 sb_gquotino; /* group quota inode */
230 __be16 sb_qflags; /* quota flags */
231 __u8 sb_flags; /* misc. flags */
232 __u8 sb_shared_vn; /* shared version number */
233 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
234 __be32 sb_unit; /* stripe or raid unit */
235 __be32 sb_width; /* stripe or raid width */
236 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
237 __u8 sb_logsectlog; /* log2 of the log sector size */
238 __be16 sb_logsectsize; /* sector size for the log, bytes */
239 __be32 sb_logsunit; /* stripe unit size for the log */
240 __be32 sb_features2; /* additional feature bits */
241 /*
242 * bad features2 field as a result of failing to pad the sb
243 * structure to 64 bits. Some machines will be using this field
244 * for features2 bits. Easiest just to mark it bad and not use
245 * it for anything else.
246 */
247 __be32 sb_bad_features2;
248
249 /* version 5 superblock fields start here */
250
251 /* feature masks */
252 __be32 sb_features_compat;
253 __be32 sb_features_ro_compat;
254 __be32 sb_features_incompat;
255 __be32 sb_features_log_incompat;
256
257 __le32 sb_crc; /* superblock crc */
258 __be32 sb_pad;
259
260 __be64 sb_pquotino; /* project quota inode */
261 __be64 sb_lsn; /* last write sequence */
262
263 /* must be padded to 64 bit alignment */
264 } xfs_dsb_t;
265
266 /*
267 * Sequence number values for the fields.
268 */
269 typedef enum {
270 XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
271 XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
272 XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
273 XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
274 XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
275 XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
276 XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
277 XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
278 XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
279 XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
280 XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
281 XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
282 XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
283 XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT,
284 XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD,
285 XFS_SBS_PQUOTINO, XFS_SBS_LSN,
286 XFS_SBS_FIELDCOUNT
287 } xfs_sb_field_t;
288
289 /*
290 * Mask values, defined based on the xfs_sb_field_t values.
291 * Only define the ones we're using.
292 */
293 #define XFS_SB_MVAL(x) (1LL << XFS_SBS_ ## x)
294 #define XFS_SB_UUID XFS_SB_MVAL(UUID)
295 #define XFS_SB_FNAME XFS_SB_MVAL(FNAME)
296 #define XFS_SB_ROOTINO XFS_SB_MVAL(ROOTINO)
297 #define XFS_SB_RBMINO XFS_SB_MVAL(RBMINO)
298 #define XFS_SB_RSUMINO XFS_SB_MVAL(RSUMINO)
299 #define XFS_SB_VERSIONNUM XFS_SB_MVAL(VERSIONNUM)
300 #define XFS_SB_UQUOTINO XFS_SB_MVAL(UQUOTINO)
301 #define XFS_SB_GQUOTINO XFS_SB_MVAL(GQUOTINO)
302 #define XFS_SB_QFLAGS XFS_SB_MVAL(QFLAGS)
303 #define XFS_SB_SHARED_VN XFS_SB_MVAL(SHARED_VN)
304 #define XFS_SB_UNIT XFS_SB_MVAL(UNIT)
305 #define XFS_SB_WIDTH XFS_SB_MVAL(WIDTH)
306 #define XFS_SB_ICOUNT XFS_SB_MVAL(ICOUNT)
307 #define XFS_SB_IFREE XFS_SB_MVAL(IFREE)
308 #define XFS_SB_FDBLOCKS XFS_SB_MVAL(FDBLOCKS)
309 #define XFS_SB_FEATURES2 XFS_SB_MVAL(FEATURES2)
310 #define XFS_SB_BAD_FEATURES2 XFS_SB_MVAL(BAD_FEATURES2)
311 #define XFS_SB_FEATURES_COMPAT XFS_SB_MVAL(FEATURES_COMPAT)
312 #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
313 #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
314 #define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT)
315 #define XFS_SB_CRC XFS_SB_MVAL(CRC)
316 #define XFS_SB_PQUOTINO XFS_SB_MVAL(PQUOTINO)
317 #define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT)
318 #define XFS_SB_ALL_BITS ((1LL << XFS_SB_NUM_BITS) - 1)
319 #define XFS_SB_MOD_BITS \
320 (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
321 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
322 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
323 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
324 XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
325 XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \
326 XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO)
327
328
329 /*
330 * Misc. Flags - warning - these will be cleared by xfs_repair unless
331 * a feature bit is set when the flag is used.
332 */
333 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */
334 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
335
336 /*
337 * define max. shared version we can interoperate with
338 */
339 #define XFS_SB_MAX_SHARED_VN 0
340
341 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
342
xfs_sb_good_version(xfs_sb_t * sbp)343 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
344 {
345 /* We always support version 1-3 */
346 if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
347 sbp->sb_versionnum <= XFS_SB_VERSION_3)
348 return 1;
349
350 /* We support version 4 if all feature bits are supported */
351 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
352 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
353 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
354 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
355 return 0;
356
357 #ifdef __KERNEL__
358 if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
359 return 0;
360 #else
361 if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
362 sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
363 return 0;
364 #endif
365
366 return 1;
367 }
368 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
369 return 1;
370
371 return 0;
372 }
373
374 /*
375 * Detect a mismatched features2 field. Older kernels read/wrote
376 * this into the wrong slot, so to be safe we keep them in sync.
377 */
xfs_sb_has_mismatched_features2(xfs_sb_t * sbp)378 static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
379 {
380 return (sbp->sb_bad_features2 != sbp->sb_features2);
381 }
382
xfs_sb_version_tonew(unsigned v)383 static inline unsigned xfs_sb_version_tonew(unsigned v)
384 {
385 if (v == XFS_SB_VERSION_1)
386 return XFS_SB_VERSION_4;
387
388 if (v == XFS_SB_VERSION_2)
389 return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
390
391 return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
392 XFS_SB_VERSION_NLINKBIT;
393 }
394
xfs_sb_version_toold(unsigned v)395 static inline unsigned xfs_sb_version_toold(unsigned v)
396 {
397 if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
398 return 0;
399 if (v & XFS_SB_VERSION_NLINKBIT)
400 return XFS_SB_VERSION_3;
401 if (v & XFS_SB_VERSION_ATTRBIT)
402 return XFS_SB_VERSION_2;
403 return XFS_SB_VERSION_1;
404 }
405
xfs_sb_version_hasattr(xfs_sb_t * sbp)406 static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
407 {
408 return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
409 sbp->sb_versionnum == XFS_SB_VERSION_3 ||
410 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
411 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
412 }
413
xfs_sb_version_addattr(xfs_sb_t * sbp)414 static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
415 {
416 if (sbp->sb_versionnum == XFS_SB_VERSION_1)
417 sbp->sb_versionnum = XFS_SB_VERSION_2;
418 else if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
419 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
420 else
421 sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
422 }
423
xfs_sb_version_hasnlink(xfs_sb_t * sbp)424 static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
425 {
426 return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
427 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
428 (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
429 }
430
xfs_sb_version_addnlink(xfs_sb_t * sbp)431 static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
432 {
433 if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
434 sbp->sb_versionnum = XFS_SB_VERSION_3;
435 else
436 sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
437 }
438
xfs_sb_version_hasquota(xfs_sb_t * sbp)439 static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
440 {
441 return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
442 (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
443 }
444
xfs_sb_version_addquota(xfs_sb_t * sbp)445 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
446 {
447 if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
448 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
449 else
450 sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
451 XFS_SB_VERSION_QUOTABIT;
452 }
453
xfs_sb_version_hasalign(xfs_sb_t * sbp)454 static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
455 {
456 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
457 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
458 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
459 }
460
xfs_sb_version_hasdalign(xfs_sb_t * sbp)461 static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
462 {
463 return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
464 (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
465 }
466
xfs_sb_version_hasshared(xfs_sb_t * sbp)467 static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
468 {
469 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
470 (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
471 }
472
xfs_sb_version_hasdirv2(xfs_sb_t * sbp)473 static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
474 {
475 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
476 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
477 (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT));
478 }
479
xfs_sb_version_haslogv2(xfs_sb_t * sbp)480 static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
481 {
482 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
483 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
484 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT));
485 }
486
xfs_sb_version_hasextflgbit(xfs_sb_t * sbp)487 static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
488 {
489 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
490 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
491 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT));
492 }
493
xfs_sb_version_hassector(xfs_sb_t * sbp)494 static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
495 {
496 return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
497 (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
498 }
499
xfs_sb_version_hasasciici(xfs_sb_t * sbp)500 static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
501 {
502 return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
503 (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
504 }
505
xfs_sb_version_hasmorebits(xfs_sb_t * sbp)506 static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
507 {
508 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
509 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
510 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT));
511 }
512
513 /*
514 * sb_features2 bit version macros.
515 *
516 * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
517 *
518 * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
519 * ((xfs_sb_version_hasmorebits(sbp) &&
520 * ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
521 */
522
xfs_sb_version_haslazysbcount(xfs_sb_t * sbp)523 static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
524 {
525 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
526 (xfs_sb_version_hasmorebits(sbp) &&
527 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
528 }
529
xfs_sb_version_hasattr2(xfs_sb_t * sbp)530 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
531 {
532 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
533 (xfs_sb_version_hasmorebits(sbp) &&
534 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
535 }
536
xfs_sb_version_addattr2(xfs_sb_t * sbp)537 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
538 {
539 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
540 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
541 }
542
xfs_sb_version_removeattr2(xfs_sb_t * sbp)543 static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
544 {
545 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
546 if (!sbp->sb_features2)
547 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
548 }
549
xfs_sb_version_hasprojid32bit(xfs_sb_t * sbp)550 static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
551 {
552 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
553 (xfs_sb_version_hasmorebits(sbp) &&
554 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
555 }
556
xfs_sb_version_hascrc(xfs_sb_t * sbp)557 static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
558 {
559 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
560 }
561
562
563 /*
564 * Extended v5 superblock feature masks. These are to be used for new v5
565 * superblock features only.
566 *
567 * Compat features are new features that old kernels will not notice or affect
568 * and so can mount read-write without issues.
569 *
570 * RO-Compat (read only) are features that old kernels can read but will break
571 * if they write. Hence only read-only mounts of such filesystems are allowed on
572 * kernels that don't support the feature bit.
573 *
574 * InCompat features are features which old kernels will not understand and so
575 * must not mount.
576 *
577 * Log-InCompat features are for changes to log formats or new transactions that
578 * can't be replayed on older kernels. The fields are set when the filesystem is
579 * mounted, and a clean unmount clears the fields.
580 */
581 #define XFS_SB_FEAT_COMPAT_ALL 0
582 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
583 static inline bool
xfs_sb_has_compat_feature(struct xfs_sb * sbp,__uint32_t feature)584 xfs_sb_has_compat_feature(
585 struct xfs_sb *sbp,
586 __uint32_t feature)
587 {
588 return (sbp->sb_features_compat & feature) != 0;
589 }
590
591 #define XFS_SB_FEAT_RO_COMPAT_ALL 0
592 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
593 static inline bool
xfs_sb_has_ro_compat_feature(struct xfs_sb * sbp,__uint32_t feature)594 xfs_sb_has_ro_compat_feature(
595 struct xfs_sb *sbp,
596 __uint32_t feature)
597 {
598 return (sbp->sb_features_ro_compat & feature) != 0;
599 }
600
601 #define XFS_SB_FEAT_INCOMPAT_ALL 0
602 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
603 static inline bool
xfs_sb_has_incompat_feature(struct xfs_sb * sbp,__uint32_t feature)604 xfs_sb_has_incompat_feature(
605 struct xfs_sb *sbp,
606 __uint32_t feature)
607 {
608 return (sbp->sb_features_incompat & feature) != 0;
609 }
610
611 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
612 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
613 static inline bool
xfs_sb_has_incompat_log_feature(struct xfs_sb * sbp,__uint32_t feature)614 xfs_sb_has_incompat_log_feature(
615 struct xfs_sb *sbp,
616 __uint32_t feature)
617 {
618 return (sbp->sb_features_log_incompat & feature) != 0;
619 }
620
621 /*
622 * end of superblock version macros
623 */
624
625 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
626 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
627 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
628
629 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
630 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
631 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
632 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
633 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
634
635 /*
636 * File system sector to basic block conversions.
637 */
638 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
639
640 /*
641 * File system block to basic block conversions.
642 */
643 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
644 #define XFS_BB_TO_FSB(mp,bb) \
645 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
646 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
647
648 /*
649 * File system block to byte conversions.
650 */
651 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
652 #define XFS_B_TO_FSB(mp,b) \
653 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
654 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
655 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
656
657 #endif /* __XFS_SB_H__ */
658