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TOMOYO Linux Cross Reference
Linux/fs/xfs/libxfs/xfs_format.h

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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