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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ 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-3.16.76 ] ~ [ 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_REFLINK  (1 << 2)         /* reflinked files */
460 #define XFS_SB_FEAT_RO_COMPAT_ALL \
461                 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
462                  XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
463                  XFS_SB_FEAT_RO_COMPAT_REFLINK)
464 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN   ~XFS_SB_FEAT_RO_COMPAT_ALL
465 static inline bool
466 xfs_sb_has_ro_compat_feature(
467         struct xfs_sb   *sbp,
468         __uint32_t      feature)
469 {
470         return (sbp->sb_features_ro_compat & feature) != 0;
471 }
472 
473 #define XFS_SB_FEAT_INCOMPAT_FTYPE      (1 << 0)        /* filetype in dirent */
474 #define XFS_SB_FEAT_INCOMPAT_SPINODES   (1 << 1)        /* sparse inode chunks */
475 #define XFS_SB_FEAT_INCOMPAT_META_UUID  (1 << 2)        /* metadata UUID */
476 #define XFS_SB_FEAT_INCOMPAT_ALL \
477                 (XFS_SB_FEAT_INCOMPAT_FTYPE|    \
478                  XFS_SB_FEAT_INCOMPAT_SPINODES| \
479                  XFS_SB_FEAT_INCOMPAT_META_UUID)
480 
481 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN    ~XFS_SB_FEAT_INCOMPAT_ALL
482 static inline bool
483 xfs_sb_has_incompat_feature(
484         struct xfs_sb   *sbp,
485         __uint32_t      feature)
486 {
487         return (sbp->sb_features_incompat & feature) != 0;
488 }
489 
490 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
491 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN        ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
492 static inline bool
493 xfs_sb_has_incompat_log_feature(
494         struct xfs_sb   *sbp,
495         __uint32_t      feature)
496 {
497         return (sbp->sb_features_log_incompat & feature) != 0;
498 }
499 
500 /*
501  * V5 superblock specific feature checks
502  */
503 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
504 {
505         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
506 }
507 
508 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
509 {
510         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
511 }
512 
513 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
514 {
515         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
516                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
517                (xfs_sb_version_hasmorebits(sbp) &&
518                  (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
519 }
520 
521 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
522 {
523         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
524                 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
525 }
526 
527 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
528 {
529         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
530                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
531 }
532 
533 /*
534  * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
535  * is stored separately from the user-visible UUID; this allows the
536  * user-visible UUID to be changed on V5 filesystems which have a
537  * filesystem UUID stamped into every piece of metadata.
538  */
539 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
540 {
541         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
542                 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
543 }
544 
545 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp)
546 {
547         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
548                 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
549 }
550 
551 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
552 {
553         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
554                 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
555 }
556 
557 /*
558  * end of superblock version macros
559  */
560 
561 static inline bool
562 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
563 {
564         return (ino == sbp->sb_uquotino ||
565                 ino == sbp->sb_gquotino ||
566                 ino == sbp->sb_pquotino);
567 }
568 
569 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
570 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
571 #define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
572 
573 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
574 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
575                         xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
576 #define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
577                         XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
578 
579 /*
580  * File system sector to basic block conversions.
581  */
582 #define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
583 
584 /*
585  * File system block to basic block conversions.
586  */
587 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
588 #define XFS_BB_TO_FSB(mp,bb)    \
589         (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
590 #define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
591 
592 /*
593  * File system block to byte conversions.
594  */
595 #define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
596 #define XFS_B_TO_FSB(mp,b)      \
597         ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
598 #define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
599 #define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
600 
601 /*
602  * Allocation group header
603  *
604  * This is divided into three structures, placed in sequential 512-byte
605  * buffers after a copy of the superblock (also in a 512-byte buffer).
606  */
607 #define XFS_AGF_MAGIC   0x58414746      /* 'XAGF' */
608 #define XFS_AGI_MAGIC   0x58414749      /* 'XAGI' */
609 #define XFS_AGFL_MAGIC  0x5841464c      /* 'XAFL' */
610 #define XFS_AGF_VERSION 1
611 #define XFS_AGI_VERSION 1
612 
613 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
614 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
615 
616 /*
617  * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
618  * arrays below.
619  */
620 #define XFS_BTNUM_AGF   ((int)XFS_BTNUM_RMAPi + 1)
621 
622 /*
623  * The second word of agf_levels in the first a.g. overlaps the EFS
624  * superblock's magic number.  Since the magic numbers valid for EFS
625  * are > 64k, our value cannot be confused for an EFS superblock's.
626  */
627 
628 typedef struct xfs_agf {
629         /*
630          * Common allocation group header information
631          */
632         __be32          agf_magicnum;   /* magic number == XFS_AGF_MAGIC */
633         __be32          agf_versionnum; /* header version == XFS_AGF_VERSION */
634         __be32          agf_seqno;      /* sequence # starting from 0 */
635         __be32          agf_length;     /* size in blocks of a.g. */
636         /*
637          * Freespace and rmap information
638          */
639         __be32          agf_roots[XFS_BTNUM_AGF];       /* root blocks */
640         __be32          agf_levels[XFS_BTNUM_AGF];      /* btree levels */
641 
642         __be32          agf_flfirst;    /* first freelist block's index */
643         __be32          agf_fllast;     /* last freelist block's index */
644         __be32          agf_flcount;    /* count of blocks in freelist */
645         __be32          agf_freeblks;   /* total free blocks */
646 
647         __be32          agf_longest;    /* longest free space */
648         __be32          agf_btreeblks;  /* # of blocks held in AGF btrees */
649         uuid_t          agf_uuid;       /* uuid of filesystem */
650 
651         __be32          agf_rmap_blocks;        /* rmapbt blocks used */
652         __be32          agf_refcount_blocks;    /* refcountbt blocks used */
653 
654         __be32          agf_refcount_root;      /* refcount tree root block */
655         __be32          agf_refcount_level;     /* refcount btree levels */
656 
657         /*
658          * reserve some contiguous space for future logged fields before we add
659          * the unlogged fields. This makes the range logging via flags and
660          * structure offsets much simpler.
661          */
662         __be64          agf_spare64[14];
663 
664         /* unlogged fields, written during buffer writeback. */
665         __be64          agf_lsn;        /* last write sequence */
666         __be32          agf_crc;        /* crc of agf sector */
667         __be32          agf_spare2;
668 
669         /* structure must be padded to 64 bit alignment */
670 } xfs_agf_t;
671 
672 #define XFS_AGF_CRC_OFF         offsetof(struct xfs_agf, agf_crc)
673 
674 #define XFS_AGF_MAGICNUM        0x00000001
675 #define XFS_AGF_VERSIONNUM      0x00000002
676 #define XFS_AGF_SEQNO           0x00000004
677 #define XFS_AGF_LENGTH          0x00000008
678 #define XFS_AGF_ROOTS           0x00000010
679 #define XFS_AGF_LEVELS          0x00000020
680 #define XFS_AGF_FLFIRST         0x00000040
681 #define XFS_AGF_FLLAST          0x00000080
682 #define XFS_AGF_FLCOUNT         0x00000100
683 #define XFS_AGF_FREEBLKS        0x00000200
684 #define XFS_AGF_LONGEST         0x00000400
685 #define XFS_AGF_BTREEBLKS       0x00000800
686 #define XFS_AGF_UUID            0x00001000
687 #define XFS_AGF_RMAP_BLOCKS     0x00002000
688 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
689 #define XFS_AGF_REFCOUNT_ROOT   0x00008000
690 #define XFS_AGF_REFCOUNT_LEVEL  0x00010000
691 #define XFS_AGF_SPARE64         0x00020000
692 #define XFS_AGF_NUM_BITS        18
693 #define XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
694 
695 #define XFS_AGF_FLAGS \
696         { XFS_AGF_MAGICNUM,     "MAGICNUM" }, \
697         { XFS_AGF_VERSIONNUM,   "VERSIONNUM" }, \
698         { XFS_AGF_SEQNO,        "SEQNO" }, \
699         { XFS_AGF_LENGTH,       "LENGTH" }, \
700         { XFS_AGF_ROOTS,        "ROOTS" }, \
701         { XFS_AGF_LEVELS,       "LEVELS" }, \
702         { XFS_AGF_FLFIRST,      "FLFIRST" }, \
703         { XFS_AGF_FLLAST,       "FLLAST" }, \
704         { XFS_AGF_FLCOUNT,      "FLCOUNT" }, \
705         { XFS_AGF_FREEBLKS,     "FREEBLKS" }, \
706         { XFS_AGF_LONGEST,      "LONGEST" }, \
707         { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }, \
708         { XFS_AGF_UUID,         "UUID" }, \
709         { XFS_AGF_RMAP_BLOCKS,  "RMAP_BLOCKS" }, \
710         { XFS_AGF_REFCOUNT_BLOCKS,      "REFCOUNT_BLOCKS" }, \
711         { XFS_AGF_REFCOUNT_ROOT,        "REFCOUNT_ROOT" }, \
712         { XFS_AGF_REFCOUNT_LEVEL,       "REFCOUNT_LEVEL" }, \
713         { XFS_AGF_SPARE64,      "SPARE64" }
714 
715 /* disk block (xfs_daddr_t) in the AG */
716 #define XFS_AGF_DADDR(mp)       ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
717 #define XFS_AGF_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
718 #define XFS_BUF_TO_AGF(bp)      ((xfs_agf_t *)((bp)->b_addr))
719 
720 /*
721  * Size of the unlinked inode hash table in the agi.
722  */
723 #define XFS_AGI_UNLINKED_BUCKETS        64
724 
725 typedef struct xfs_agi {
726         /*
727          * Common allocation group header information
728          */
729         __be32          agi_magicnum;   /* magic number == XFS_AGI_MAGIC */
730         __be32          agi_versionnum; /* header version == XFS_AGI_VERSION */
731         __be32          agi_seqno;      /* sequence # starting from 0 */
732         __be32          agi_length;     /* size in blocks of a.g. */
733         /*
734          * Inode information
735          * Inodes are mapped by interpreting the inode number, so no
736          * mapping data is needed here.
737          */
738         __be32          agi_count;      /* count of allocated inodes */
739         __be32          agi_root;       /* root of inode btree */
740         __be32          agi_level;      /* levels in inode btree */
741         __be32          agi_freecount;  /* number of free inodes */
742 
743         __be32          agi_newino;     /* new inode just allocated */
744         __be32          agi_dirino;     /* last directory inode chunk */
745         /*
746          * Hash table of inodes which have been unlinked but are
747          * still being referenced.
748          */
749         __be32          agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
750         /*
751          * This marks the end of logging region 1 and start of logging region 2.
752          */
753         uuid_t          agi_uuid;       /* uuid of filesystem */
754         __be32          agi_crc;        /* crc of agi sector */
755         __be32          agi_pad32;
756         __be64          agi_lsn;        /* last write sequence */
757 
758         __be32          agi_free_root; /* root of the free inode btree */
759         __be32          agi_free_level;/* levels in free inode btree */
760 
761         /* structure must be padded to 64 bit alignment */
762 } xfs_agi_t;
763 
764 #define XFS_AGI_CRC_OFF         offsetof(struct xfs_agi, agi_crc)
765 
766 #define XFS_AGI_MAGICNUM        (1 << 0)
767 #define XFS_AGI_VERSIONNUM      (1 << 1)
768 #define XFS_AGI_SEQNO           (1 << 2)
769 #define XFS_AGI_LENGTH          (1 << 3)
770 #define XFS_AGI_COUNT           (1 << 4)
771 #define XFS_AGI_ROOT            (1 << 5)
772 #define XFS_AGI_LEVEL           (1 << 6)
773 #define XFS_AGI_FREECOUNT       (1 << 7)
774 #define XFS_AGI_NEWINO          (1 << 8)
775 #define XFS_AGI_DIRINO          (1 << 9)
776 #define XFS_AGI_UNLINKED        (1 << 10)
777 #define XFS_AGI_NUM_BITS_R1     11      /* end of the 1st agi logging region */
778 #define XFS_AGI_ALL_BITS_R1     ((1 << XFS_AGI_NUM_BITS_R1) - 1)
779 #define XFS_AGI_FREE_ROOT       (1 << 11)
780 #define XFS_AGI_FREE_LEVEL      (1 << 12)
781 #define XFS_AGI_NUM_BITS_R2     13
782 
783 /* disk block (xfs_daddr_t) in the AG */
784 #define XFS_AGI_DADDR(mp)       ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
785 #define XFS_AGI_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
786 #define XFS_BUF_TO_AGI(bp)      ((xfs_agi_t *)((bp)->b_addr))
787 
788 /*
789  * The third a.g. block contains the a.g. freelist, an array
790  * of block pointers to blocks owned by the allocation btree code.
791  */
792 #define XFS_AGFL_DADDR(mp)      ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
793 #define XFS_AGFL_BLOCK(mp)      XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
794 #define XFS_BUF_TO_AGFL(bp)     ((xfs_agfl_t *)((bp)->b_addr))
795 
796 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
797         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
798                 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
799                 (__be32 *)(bp)->b_addr)
800 
801 /*
802  * Size of the AGFL.  For CRC-enabled filesystes we steal a couple of
803  * slots in the beginning of the block for a proper header with the
804  * location information and CRC.
805  */
806 #define XFS_AGFL_SIZE(mp) \
807         (((mp)->m_sb.sb_sectsize - \
808          (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
809                 sizeof(struct xfs_agfl) : 0)) / \
810           sizeof(xfs_agblock_t))
811 
812 typedef struct xfs_agfl {
813         __be32          agfl_magicnum;
814         __be32          agfl_seqno;
815         uuid_t          agfl_uuid;
816         __be64          agfl_lsn;
817         __be32          agfl_crc;
818         __be32          agfl_bno[];     /* actually XFS_AGFL_SIZE(mp) */
819 } __attribute__((packed)) xfs_agfl_t;
820 
821 #define XFS_AGFL_CRC_OFF        offsetof(struct xfs_agfl, agfl_crc)
822 
823 #define XFS_AGB_TO_FSB(mp,agno,agbno)   \
824         (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
825 #define XFS_FSB_TO_AGNO(mp,fsbno)       \
826         ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
827 #define XFS_FSB_TO_AGBNO(mp,fsbno)      \
828         ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
829 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
830         ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
831                 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
832 #define XFS_AG_DADDR(mp,agno,d)         (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
833 
834 /*
835  * For checking for bad ranges of xfs_daddr_t's, covering multiple
836  * allocation groups or a single xfs_daddr_t that's a superblock copy.
837  */
838 #define XFS_AG_CHECK_DADDR(mp,d,len)    \
839         ((len) == 1 ? \
840             ASSERT((d) == XFS_SB_DADDR || \
841                    xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
842             ASSERT(xfs_daddr_to_agno(mp, d) == \
843                    xfs_daddr_to_agno(mp, (d) + (len) - 1)))
844 
845 typedef struct xfs_timestamp {
846         __be32          t_sec;          /* timestamp seconds */
847         __be32          t_nsec;         /* timestamp nanoseconds */
848 } xfs_timestamp_t;
849 
850 /*
851  * On-disk inode structure.
852  *
853  * This is just the header or "dinode core", the inode is expanded to fill a
854  * variable size the leftover area split into a data and an attribute fork.
855  * The format of the data and attribute fork depends on the format of the
856  * inode as indicated by di_format and di_aformat.  To access the data and
857  * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
858  * below.
859  *
860  * There is a very similar struct icdinode in xfs_inode which matches the
861  * layout of the first 96 bytes of this structure, but is kept in native
862  * format instead of big endian.
863  *
864  * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
865  * padding field for v3 inodes.
866  */
867 #define XFS_DINODE_MAGIC                0x494e  /* 'IN' */
868 typedef struct xfs_dinode {
869         __be16          di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
870         __be16          di_mode;        /* mode and type of file */
871         __u8            di_version;     /* inode version */
872         __u8            di_format;      /* format of di_c data */
873         __be16          di_onlink;      /* old number of links to file */
874         __be32          di_uid;         /* owner's user id */
875         __be32          di_gid;         /* owner's group id */
876         __be32          di_nlink;       /* number of links to file */
877         __be16          di_projid_lo;   /* lower part of owner's project id */
878         __be16          di_projid_hi;   /* higher part owner's project id */
879         __u8            di_pad[6];      /* unused, zeroed space */
880         __be16          di_flushiter;   /* incremented on flush */
881         xfs_timestamp_t di_atime;       /* time last accessed */
882         xfs_timestamp_t di_mtime;       /* time last modified */
883         xfs_timestamp_t di_ctime;       /* time created/inode modified */
884         __be64          di_size;        /* number of bytes in file */
885         __be64          di_nblocks;     /* # of direct & btree blocks used */
886         __be32          di_extsize;     /* basic/minimum extent size for file */
887         __be32          di_nextents;    /* number of extents in data fork */
888         __be16          di_anextents;   /* number of extents in attribute fork*/
889         __u8            di_forkoff;     /* attr fork offs, <<3 for 64b align */
890         __s8            di_aformat;     /* format of attr fork's data */
891         __be32          di_dmevmask;    /* DMIG event mask */
892         __be16          di_dmstate;     /* DMIG state info */
893         __be16          di_flags;       /* random flags, XFS_DIFLAG_... */
894         __be32          di_gen;         /* generation number */
895 
896         /* di_next_unlinked is the only non-core field in the old dinode */
897         __be32          di_next_unlinked;/* agi unlinked list ptr */
898 
899         /* start of the extended dinode, writable fields */
900         __le32          di_crc;         /* CRC of the inode */
901         __be64          di_changecount; /* number of attribute changes */
902         __be64          di_lsn;         /* flush sequence */
903         __be64          di_flags2;      /* more random flags */
904         __be32          di_cowextsize;  /* basic cow extent size for file */
905         __u8            di_pad2[12];    /* more padding for future expansion */
906 
907         /* fields only written to during inode creation */
908         xfs_timestamp_t di_crtime;      /* time created */
909         __be64          di_ino;         /* inode number */
910         uuid_t          di_uuid;        /* UUID of the filesystem */
911 
912         /* structure must be padded to 64 bit alignment */
913 } xfs_dinode_t;
914 
915 #define XFS_DINODE_CRC_OFF      offsetof(struct xfs_dinode, di_crc)
916 
917 #define DI_MAX_FLUSH 0xffff
918 
919 /*
920  * Size of the core inode on disk.  Version 1 and 2 inodes have
921  * the same size, but version 3 has grown a few additional fields.
922  */
923 static inline uint xfs_dinode_size(int version)
924 {
925         if (version == 3)
926                 return sizeof(struct xfs_dinode);
927         return offsetof(struct xfs_dinode, di_crc);
928 }
929 
930 /*
931  * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
932  * Since the pathconf interface is signed, we use 2^31 - 1 instead.
933  * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
934  */
935 #define XFS_MAXLINK             ((1U << 31) - 1U)
936 #define XFS_MAXLINK_1           65535U
937 
938 /*
939  * Values for di_format
940  */
941 typedef enum xfs_dinode_fmt {
942         XFS_DINODE_FMT_DEV,             /* xfs_dev_t */
943         XFS_DINODE_FMT_LOCAL,           /* bulk data */
944         XFS_DINODE_FMT_EXTENTS,         /* struct xfs_bmbt_rec */
945         XFS_DINODE_FMT_BTREE,           /* struct xfs_bmdr_block */
946         XFS_DINODE_FMT_UUID             /* uuid_t */
947 } xfs_dinode_fmt_t;
948 
949 /*
950  * Inode minimum and maximum sizes.
951  */
952 #define XFS_DINODE_MIN_LOG      8
953 #define XFS_DINODE_MAX_LOG      11
954 #define XFS_DINODE_MIN_SIZE     (1 << XFS_DINODE_MIN_LOG)
955 #define XFS_DINODE_MAX_SIZE     (1 << XFS_DINODE_MAX_LOG)
956 
957 /*
958  * Inode size for given fs.
959  */
960 #define XFS_LITINO(mp, version) \
961         ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
962 
963 /*
964  * Inode data & attribute fork sizes, per inode.
965  */
966 #define XFS_DFORK_Q(dip)                ((dip)->di_forkoff != 0)
967 #define XFS_DFORK_BOFF(dip)             ((int)((dip)->di_forkoff << 3))
968 
969 #define XFS_DFORK_DSIZE(dip,mp) \
970         (XFS_DFORK_Q(dip) ? \
971                 XFS_DFORK_BOFF(dip) : \
972                 XFS_LITINO(mp, (dip)->di_version))
973 #define XFS_DFORK_ASIZE(dip,mp) \
974         (XFS_DFORK_Q(dip) ? \
975                 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
976                 0)
977 #define XFS_DFORK_SIZE(dip,mp,w) \
978         ((w) == XFS_DATA_FORK ? \
979                 XFS_DFORK_DSIZE(dip, mp) : \
980                 XFS_DFORK_ASIZE(dip, mp))
981 
982 /*
983  * Return pointers to the data or attribute forks.
984  */
985 #define XFS_DFORK_DPTR(dip) \
986         ((char *)dip + xfs_dinode_size(dip->di_version))
987 #define XFS_DFORK_APTR(dip)     \
988         (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
989 #define XFS_DFORK_PTR(dip,w)    \
990         ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
991 
992 #define XFS_DFORK_FORMAT(dip,w) \
993         ((w) == XFS_DATA_FORK ? \
994                 (dip)->di_format : \
995                 (dip)->di_aformat)
996 #define XFS_DFORK_NEXTENTS(dip,w) \
997         ((w) == XFS_DATA_FORK ? \
998                 be32_to_cpu((dip)->di_nextents) : \
999                 be16_to_cpu((dip)->di_anextents))
1000 
1001 /*
1002  * For block and character special files the 32bit dev_t is stored at the
1003  * beginning of the data fork.
1004  */
1005 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
1006 {
1007         return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
1008 }
1009 
1010 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
1011 {
1012         *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
1013 }
1014 
1015 /*
1016  * Values for di_flags
1017  */
1018 #define XFS_DIFLAG_REALTIME_BIT  0      /* file's blocks come from rt area */
1019 #define XFS_DIFLAG_PREALLOC_BIT  1      /* file space has been preallocated */
1020 #define XFS_DIFLAG_NEWRTBM_BIT   2      /* for rtbitmap inode, new format */
1021 #define XFS_DIFLAG_IMMUTABLE_BIT 3      /* inode is immutable */
1022 #define XFS_DIFLAG_APPEND_BIT    4      /* inode is append-only */
1023 #define XFS_DIFLAG_SYNC_BIT      5      /* inode is written synchronously */
1024 #define XFS_DIFLAG_NOATIME_BIT   6      /* do not update atime */
1025 #define XFS_DIFLAG_NODUMP_BIT    7      /* do not dump */
1026 #define XFS_DIFLAG_RTINHERIT_BIT 8      /* create with realtime bit set */
1027 #define XFS_DIFLAG_PROJINHERIT_BIT   9  /* create with parents projid */
1028 #define XFS_DIFLAG_NOSYMLINKS_BIT   10  /* disallow symlink creation */
1029 #define XFS_DIFLAG_EXTSIZE_BIT      11  /* inode extent size allocator hint */
1030 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12  /* inherit inode extent size */
1031 #define XFS_DIFLAG_NODEFRAG_BIT     13  /* do not reorganize/defragment */
1032 #define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
1033 #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
1034 #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
1035 #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
1036 #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1037 #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
1038 #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
1039 #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
1040 #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
1041 #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
1042 #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1043 #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1044 #define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
1045 #define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1046 #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
1047 #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
1048 
1049 #define XFS_DIFLAG_ANY \
1050         (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1051          XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1052          XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1053          XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1054          XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1055 
1056 /*
1057  * Values for di_flags2 These start by being exposed to userspace in the upper
1058  * 16 bits of the XFS_XFLAG_s range.
1059  */
1060 #define XFS_DIFLAG2_DAX_BIT     0       /* use DAX for this inode */
1061 #define XFS_DIFLAG2_REFLINK_BIT 1       /* file's blocks may be shared */
1062 #define XFS_DIFLAG2_COWEXTSIZE_BIT   2  /* copy on write extent size hint */
1063 #define XFS_DIFLAG2_DAX         (1 << XFS_DIFLAG2_DAX_BIT)
1064 #define XFS_DIFLAG2_REFLINK     (1 << XFS_DIFLAG2_REFLINK_BIT)
1065 #define XFS_DIFLAG2_COWEXTSIZE  (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
1066 
1067 #define XFS_DIFLAG2_ANY \
1068         (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
1069 
1070 /*
1071  * Inode number format:
1072  * low inopblog bits - offset in block
1073  * next agblklog bits - block number in ag
1074  * next agno_log bits - ag number
1075  * high agno_log-agblklog-inopblog bits - 0
1076  */
1077 #define XFS_INO_MASK(k)                 (__uint32_t)((1ULL << (k)) - 1)
1078 #define XFS_INO_OFFSET_BITS(mp)         (mp)->m_sb.sb_inopblog
1079 #define XFS_INO_AGBNO_BITS(mp)          (mp)->m_sb.sb_agblklog
1080 #define XFS_INO_AGINO_BITS(mp)          (mp)->m_agino_log
1081 #define XFS_INO_AGNO_BITS(mp)           (mp)->m_agno_log
1082 #define XFS_INO_BITS(mp)                \
1083         XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1084 #define XFS_INO_TO_AGNO(mp,i)           \
1085         ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1086 #define XFS_INO_TO_AGINO(mp,i)          \
1087         ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1088 #define XFS_INO_TO_AGBNO(mp,i)          \
1089         (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1090                 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1091 #define XFS_INO_TO_OFFSET(mp,i)         \
1092         ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1093 #define XFS_INO_TO_FSB(mp,i)            \
1094         XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1095 #define XFS_AGINO_TO_INO(mp,a,i)        \
1096         (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1097 #define XFS_AGINO_TO_AGBNO(mp,i)        ((i) >> XFS_INO_OFFSET_BITS(mp))
1098 #define XFS_AGINO_TO_OFFSET(mp,i)       \
1099         ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1100 #define XFS_OFFBNO_TO_AGINO(mp,b,o)     \
1101         ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1102 
1103 #define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 56) - 1ULL))
1104 #define XFS_MAXINUMBER_32       ((xfs_ino_t)((1ULL << 32) - 1ULL))
1105 
1106 /*
1107  * RealTime Device format definitions
1108  */
1109 
1110 /* Min and max rt extent sizes, specified in bytes */
1111 #define XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */
1112 #define XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64kB */
1113 #define XFS_MIN_RTEXTSIZE       (4 * 1024)              /* 4kB */
1114 
1115 #define XFS_BLOCKSIZE(mp)       ((mp)->m_sb.sb_blocksize)
1116 #define XFS_BLOCKMASK(mp)       ((mp)->m_blockmask)
1117 #define XFS_BLOCKWSIZE(mp)      ((mp)->m_blockwsize)
1118 #define XFS_BLOCKWMASK(mp)      ((mp)->m_blockwmask)
1119 
1120 /*
1121  * RT Summary and bit manipulation macros.
1122  */
1123 #define XFS_SUMOFFS(mp,ls,bb)   ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1124 #define XFS_SUMOFFSTOBLOCK(mp,s)        \
1125         (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1126 #define XFS_SUMPTR(mp,bp,so)    \
1127         ((xfs_suminfo_t *)((bp)->b_addr + \
1128                 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1129 
1130 #define XFS_BITTOBLOCK(mp,bi)   ((bi) >> (mp)->m_blkbit_log)
1131 #define XFS_BLOCKTOBIT(mp,bb)   ((bb) << (mp)->m_blkbit_log)
1132 #define XFS_BITTOWORD(mp,bi)    \
1133         ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1134 
1135 #define XFS_RTMIN(a,b)  ((a) < (b) ? (a) : (b))
1136 #define XFS_RTMAX(a,b)  ((a) > (b) ? (a) : (b))
1137 
1138 #define XFS_RTLOBIT(w)  xfs_lowbit32(w)
1139 #define XFS_RTHIBIT(w)  xfs_highbit32(w)
1140 
1141 #define XFS_RTBLOCKLOG(b)       xfs_highbit64(b)
1142 
1143 /*
1144  * Dquot and dquot block format definitions
1145  */
1146 #define XFS_DQUOT_MAGIC         0x4451          /* 'DQ' */
1147 #define XFS_DQUOT_VERSION       (u_int8_t)0x01  /* latest version number */
1148 
1149 /*
1150  * This is the main portion of the on-disk representation of quota
1151  * information for a user. This is the q_core of the xfs_dquot_t that
1152  * is kept in kernel memory. We pad this with some more expansion room
1153  * to construct the on disk structure.
1154  */
1155 typedef struct  xfs_disk_dquot {
1156         __be16          d_magic;        /* dquot magic = XFS_DQUOT_MAGIC */
1157         __u8            d_version;      /* dquot version */
1158         __u8            d_flags;        /* XFS_DQ_USER/PROJ/GROUP */
1159         __be32          d_id;           /* user,project,group id */
1160         __be64          d_blk_hardlimit;/* absolute limit on disk blks */
1161         __be64          d_blk_softlimit;/* preferred limit on disk blks */
1162         __be64          d_ino_hardlimit;/* maximum # allocated inodes */
1163         __be64          d_ino_softlimit;/* preferred inode limit */
1164         __be64          d_bcount;       /* disk blocks owned by the user */
1165         __be64          d_icount;       /* inodes owned by the user */
1166         __be32          d_itimer;       /* zero if within inode limits if not,
1167                                            this is when we refuse service */
1168         __be32          d_btimer;       /* similar to above; for disk blocks */
1169         __be16          d_iwarns;       /* warnings issued wrt num inodes */
1170         __be16          d_bwarns;       /* warnings issued wrt disk blocks */
1171         __be32          d_pad0;         /* 64 bit align */
1172         __be64          d_rtb_hardlimit;/* absolute limit on realtime blks */
1173         __be64          d_rtb_softlimit;/* preferred limit on RT disk blks */
1174         __be64          d_rtbcount;     /* realtime blocks owned */
1175         __be32          d_rtbtimer;     /* similar to above; for RT disk blocks */
1176         __be16          d_rtbwarns;     /* warnings issued wrt RT disk blocks */
1177         __be16          d_pad;
1178 } xfs_disk_dquot_t;
1179 
1180 /*
1181  * This is what goes on disk. This is separated from the xfs_disk_dquot because
1182  * carrying the unnecessary padding would be a waste of memory.
1183  */
1184 typedef struct xfs_dqblk {
1185         xfs_disk_dquot_t  dd_diskdq;    /* portion that lives incore as well */
1186         char              dd_fill[4];   /* filling for posterity */
1187 
1188         /*
1189          * These two are only present on filesystems with the CRC bits set.
1190          */
1191         __be32            dd_crc;       /* checksum */
1192         __be64            dd_lsn;       /* last modification in log */
1193         uuid_t            dd_uuid;      /* location information */
1194 } xfs_dqblk_t;
1195 
1196 #define XFS_DQUOT_CRC_OFF       offsetof(struct xfs_dqblk, dd_crc)
1197 
1198 /*
1199  * Remote symlink format and access functions.
1200  */
1201 #define XFS_SYMLINK_MAGIC       0x58534c4d      /* XSLM */
1202 
1203 struct xfs_dsymlink_hdr {
1204         __be32  sl_magic;
1205         __be32  sl_offset;
1206         __be32  sl_bytes;
1207         __be32  sl_crc;
1208         uuid_t  sl_uuid;
1209         __be64  sl_owner;
1210         __be64  sl_blkno;
1211         __be64  sl_lsn;
1212 };
1213 
1214 #define XFS_SYMLINK_CRC_OFF     offsetof(struct xfs_dsymlink_hdr, sl_crc)
1215 
1216 /*
1217  * The maximum pathlen is 1024 bytes. Since the minimum file system
1218  * blocksize is 512 bytes, we can get a max of 3 extents back from
1219  * bmapi when crc headers are taken into account.
1220  */
1221 #define XFS_SYMLINK_MAPS 3
1222 
1223 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize)      \
1224         ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1225                         sizeof(struct xfs_dsymlink_hdr) : 0))
1226 
1227 
1228 /*
1229  * Allocation Btree format definitions
1230  *
1231  * There are two on-disk btrees, one sorted by blockno and one sorted
1232  * by blockcount and blockno.  All blocks look the same to make the code
1233  * simpler; if we have time later, we'll make the optimizations.
1234  */
1235 #define XFS_ABTB_MAGIC          0x41425442      /* 'ABTB' for bno tree */
1236 #define XFS_ABTB_CRC_MAGIC      0x41423342      /* 'AB3B' */
1237 #define XFS_ABTC_MAGIC          0x41425443      /* 'ABTC' for cnt tree */
1238 #define XFS_ABTC_CRC_MAGIC      0x41423343      /* 'AB3C' */
1239 
1240 /*
1241  * Data record/key structure
1242  */
1243 typedef struct xfs_alloc_rec {
1244         __be32          ar_startblock;  /* starting block number */
1245         __be32          ar_blockcount;  /* count of free blocks */
1246 } xfs_alloc_rec_t, xfs_alloc_key_t;
1247 
1248 typedef struct xfs_alloc_rec_incore {
1249         xfs_agblock_t   ar_startblock;  /* starting block number */
1250         xfs_extlen_t    ar_blockcount;  /* count of free blocks */
1251 } xfs_alloc_rec_incore_t;
1252 
1253 /* btree pointer type */
1254 typedef __be32 xfs_alloc_ptr_t;
1255 
1256 /*
1257  * Block numbers in the AG:
1258  * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1259  */
1260 #define XFS_BNO_BLOCK(mp)       ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1261 #define XFS_CNT_BLOCK(mp)       ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1262 
1263 
1264 /*
1265  * Inode Allocation Btree format definitions
1266  *
1267  * There is a btree for the inode map per allocation group.
1268  */
1269 #define XFS_IBT_MAGIC           0x49414254      /* 'IABT' */
1270 #define XFS_IBT_CRC_MAGIC       0x49414233      /* 'IAB3' */
1271 #define XFS_FIBT_MAGIC          0x46494254      /* 'FIBT' */
1272 #define XFS_FIBT_CRC_MAGIC      0x46494233      /* 'FIB3' */
1273 
1274 typedef __uint64_t      xfs_inofree_t;
1275 #define XFS_INODES_PER_CHUNK            (NBBY * sizeof(xfs_inofree_t))
1276 #define XFS_INODES_PER_CHUNK_LOG        (XFS_NBBYLOG + 3)
1277 #define XFS_INOBT_ALL_FREE              ((xfs_inofree_t)-1)
1278 #define XFS_INOBT_MASK(i)               ((xfs_inofree_t)1 << (i))
1279 
1280 #define XFS_INOBT_HOLEMASK_FULL         0       /* holemask for full chunk */
1281 #define XFS_INOBT_HOLEMASK_BITS         (NBBY * sizeof(__uint16_t))
1282 #define XFS_INODES_PER_HOLEMASK_BIT     \
1283         (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t)))
1284 
1285 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1286 {
1287         return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1288 }
1289 
1290 /*
1291  * The on-disk inode record structure has two formats. The original "full"
1292  * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1293  * and replaces the 3 high-order freecount bytes wth the holemask and inode
1294  * count.
1295  *
1296  * The holemask of the sparse record format allows an inode chunk to have holes
1297  * that refer to blocks not owned by the inode record. This facilitates inode
1298  * allocation in the event of severe free space fragmentation.
1299  */
1300 typedef struct xfs_inobt_rec {
1301         __be32          ir_startino;    /* starting inode number */
1302         union {
1303                 struct {
1304                         __be32  ir_freecount;   /* count of free inodes */
1305                 } f;
1306                 struct {
1307                         __be16  ir_holemask;/* hole mask for sparse chunks */
1308                         __u8    ir_count;       /* total inode count */
1309                         __u8    ir_freecount;   /* count of free inodes */
1310                 } sp;
1311         } ir_u;
1312         __be64          ir_free;        /* free inode mask */
1313 } xfs_inobt_rec_t;
1314 
1315 typedef struct xfs_inobt_rec_incore {
1316         xfs_agino_t     ir_startino;    /* starting inode number */
1317         __uint16_t      ir_holemask;    /* hole mask for sparse chunks */
1318         __uint8_t       ir_count;       /* total inode count */
1319         __uint8_t       ir_freecount;   /* count of free inodes (set bits) */
1320         xfs_inofree_t   ir_free;        /* free inode mask */
1321 } xfs_inobt_rec_incore_t;
1322 
1323 static inline bool xfs_inobt_issparse(uint16_t holemask)
1324 {
1325         /* non-zero holemask represents a sparse rec. */
1326         return holemask;
1327 }
1328 
1329 /*
1330  * Key structure
1331  */
1332 typedef struct xfs_inobt_key {
1333         __be32          ir_startino;    /* starting inode number */
1334 } xfs_inobt_key_t;
1335 
1336 /* btree pointer type */
1337 typedef __be32 xfs_inobt_ptr_t;
1338 
1339 /*
1340  * block numbers in the AG.
1341  */
1342 #define XFS_IBT_BLOCK(mp)               ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1343 #define XFS_FIBT_BLOCK(mp)              ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1344 
1345 /*
1346  * Reverse mapping btree format definitions
1347  *
1348  * There is a btree for the reverse map per allocation group
1349  */
1350 #define XFS_RMAP_CRC_MAGIC      0x524d4233      /* 'RMB3' */
1351 
1352 /*
1353  * Ownership info for an extent.  This is used to create reverse-mapping
1354  * entries.
1355  */
1356 #define XFS_OWNER_INFO_ATTR_FORK        (1 << 0)
1357 #define XFS_OWNER_INFO_BMBT_BLOCK       (1 << 1)
1358 struct xfs_owner_info {
1359         uint64_t                oi_owner;
1360         xfs_fileoff_t           oi_offset;
1361         unsigned int            oi_flags;
1362 };
1363 
1364 /*
1365  * Special owner types.
1366  *
1367  * Seeing as we only support up to 8EB, we have the upper bit of the owner field
1368  * to tell us we have a special owner value. We use these for static metadata
1369  * allocated at mkfs/growfs time, as well as for freespace management metadata.
1370  */
1371 #define XFS_RMAP_OWN_NULL       (-1ULL) /* No owner, for growfs */
1372 #define XFS_RMAP_OWN_UNKNOWN    (-2ULL) /* Unknown owner, for EFI recovery */
1373 #define XFS_RMAP_OWN_FS         (-3ULL) /* static fs metadata */
1374 #define XFS_RMAP_OWN_LOG        (-4ULL) /* static fs metadata */
1375 #define XFS_RMAP_OWN_AG         (-5ULL) /* AG freespace btree blocks */
1376 #define XFS_RMAP_OWN_INOBT      (-6ULL) /* Inode btree blocks */
1377 #define XFS_RMAP_OWN_INODES     (-7ULL) /* Inode chunk */
1378 #define XFS_RMAP_OWN_REFC       (-8ULL) /* refcount tree */
1379 #define XFS_RMAP_OWN_COW        (-9ULL) /* cow allocations */
1380 #define XFS_RMAP_OWN_MIN        (-10ULL) /* guard */
1381 
1382 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
1383 
1384 /*
1385  * Data record structure
1386  */
1387 struct xfs_rmap_rec {
1388         __be32          rm_startblock;  /* extent start block */
1389         __be32          rm_blockcount;  /* extent length */
1390         __be64          rm_owner;       /* extent owner */
1391         __be64          rm_offset;      /* offset within the owner */
1392 };
1393 
1394 /*
1395  * rmap btree record
1396  *  rm_offset:63 is the attribute fork flag
1397  *  rm_offset:62 is the bmbt block flag
1398  *  rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
1399  *  rm_offset:54-60 aren't used and should be zero
1400  *  rm_offset:0-53 is the block offset within the inode
1401  */
1402 #define XFS_RMAP_OFF_ATTR_FORK  ((__uint64_t)1ULL << 63)
1403 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62)
1404 #define XFS_RMAP_OFF_UNWRITTEN  ((__uint64_t)1ULL << 61)
1405 
1406 #define XFS_RMAP_LEN_MAX        ((__uint32_t)~0U)
1407 #define XFS_RMAP_OFF_FLAGS      (XFS_RMAP_OFF_ATTR_FORK | \
1408                                  XFS_RMAP_OFF_BMBT_BLOCK | \
1409                                  XFS_RMAP_OFF_UNWRITTEN)
1410 #define XFS_RMAP_OFF_MASK       ((__uint64_t)0x3FFFFFFFFFFFFFULL)
1411 
1412 #define XFS_RMAP_OFF(off)               ((off) & XFS_RMAP_OFF_MASK)
1413 
1414 #define XFS_RMAP_IS_BMBT_BLOCK(off)     (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
1415 #define XFS_RMAP_IS_ATTR_FORK(off)      (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
1416 #define XFS_RMAP_IS_UNWRITTEN(len)      (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
1417 
1418 #define RMAPBT_STARTBLOCK_BITLEN        32
1419 #define RMAPBT_BLOCKCOUNT_BITLEN        32
1420 #define RMAPBT_OWNER_BITLEN             64
1421 #define RMAPBT_ATTRFLAG_BITLEN          1
1422 #define RMAPBT_BMBTFLAG_BITLEN          1
1423 #define RMAPBT_EXNTFLAG_BITLEN          1
1424 #define RMAPBT_UNUSED_OFFSET_BITLEN     7
1425 #define RMAPBT_OFFSET_BITLEN            54
1426 
1427 #define XFS_RMAP_ATTR_FORK              (1 << 0)
1428 #define XFS_RMAP_BMBT_BLOCK             (1 << 1)
1429 #define XFS_RMAP_UNWRITTEN              (1 << 2)
1430 #define XFS_RMAP_KEY_FLAGS              (XFS_RMAP_ATTR_FORK | \
1431                                          XFS_RMAP_BMBT_BLOCK)
1432 #define XFS_RMAP_REC_FLAGS              (XFS_RMAP_UNWRITTEN)
1433 struct xfs_rmap_irec {
1434         xfs_agblock_t   rm_startblock;  /* extent start block */
1435         xfs_extlen_t    rm_blockcount;  /* extent length */
1436         __uint64_t      rm_owner;       /* extent owner */
1437         __uint64_t      rm_offset;      /* offset within the owner */
1438         unsigned int    rm_flags;       /* state flags */
1439 };
1440 
1441 /*
1442  * Key structure
1443  *
1444  * We don't use the length for lookups
1445  */
1446 struct xfs_rmap_key {
1447         __be32          rm_startblock;  /* extent start block */
1448         __be64          rm_owner;       /* extent owner */
1449         __be64          rm_offset;      /* offset within the owner */
1450 } __attribute__((packed));
1451 
1452 /* btree pointer type */
1453 typedef __be32 xfs_rmap_ptr_t;
1454 
1455 #define XFS_RMAP_BLOCK(mp) \
1456         (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1457          XFS_FIBT_BLOCK(mp) + 1 : \
1458          XFS_IBT_BLOCK(mp) + 1)
1459 
1460 /*
1461  * Reference Count Btree format definitions
1462  *
1463  */
1464 #define XFS_REFC_CRC_MAGIC      0x52334643      /* 'R3FC' */
1465 
1466 unsigned int xfs_refc_block(struct xfs_mount *mp);
1467 
1468 /*
1469  * Data record/key structure
1470  *
1471  * Each record associates a range of physical blocks (starting at
1472  * rc_startblock and ending rc_blockcount blocks later) with a reference
1473  * count (rc_refcount).  Extents that are being used to stage a copy on
1474  * write (CoW) operation are recorded in the refcount btree with a
1475  * refcount of 1.  All other records must have a refcount > 1 and must
1476  * track an extent mapped only by file data forks.
1477  *
1478  * Extents with a single owner (attributes, metadata, non-shared file
1479  * data) are not tracked here.  Free space is also not tracked here.
1480  * This is consistent with pre-reflink XFS.
1481  */
1482 
1483 /*
1484  * Extents that are being used to stage a copy on write are stored
1485  * in the refcount btree with a refcount of 1 and the upper bit set
1486  * on the startblock.  This speeds up mount time deletion of stale
1487  * staging extents because they're all at the right side of the tree.
1488  */
1489 #define XFS_REFC_COW_START              ((xfs_agblock_t)(1U << 31))
1490 #define REFCNTBT_COWFLAG_BITLEN         1
1491 #define REFCNTBT_AGBLOCK_BITLEN         31
1492 
1493 struct xfs_refcount_rec {
1494         __be32          rc_startblock;  /* starting block number */
1495         __be32          rc_blockcount;  /* count of blocks */
1496         __be32          rc_refcount;    /* number of inodes linked here */
1497 };
1498 
1499 struct xfs_refcount_key {
1500         __be32          rc_startblock;  /* starting block number */
1501 };
1502 
1503 struct xfs_refcount_irec {
1504         xfs_agblock_t   rc_startblock;  /* starting block number */
1505         xfs_extlen_t    rc_blockcount;  /* count of free blocks */
1506         xfs_nlink_t     rc_refcount;    /* number of inodes linked here */
1507 };
1508 
1509 #define MAXREFCOUNT     ((xfs_nlink_t)~0U)
1510 #define MAXREFCEXTLEN   ((xfs_extlen_t)~0U)
1511 
1512 /* btree pointer type */
1513 typedef __be32 xfs_refcount_ptr_t;
1514 
1515 
1516 /*
1517  * BMAP Btree format definitions
1518  *
1519  * This includes both the root block definition that sits inside an inode fork
1520  * and the record/pointer formats for the leaf/node in the blocks.
1521  */
1522 #define XFS_BMAP_MAGIC          0x424d4150      /* 'BMAP' */
1523 #define XFS_BMAP_CRC_MAGIC      0x424d4133      /* 'BMA3' */
1524 
1525 /*
1526  * Bmap root header, on-disk form only.
1527  */
1528 typedef struct xfs_bmdr_block {
1529         __be16          bb_level;       /* 0 is a leaf */
1530         __be16          bb_numrecs;     /* current # of data records */
1531 } xfs_bmdr_block_t;
1532 
1533 /*
1534  * Bmap btree record and extent descriptor.
1535  *  l0:63 is an extent flag (value 1 indicates non-normal).
1536  *  l0:9-62 are startoff.
1537  *  l0:0-8 and l1:21-63 are startblock.
1538  *  l1:0-20 are blockcount.
1539  */
1540 #define BMBT_EXNTFLAG_BITLEN    1
1541 #define BMBT_STARTOFF_BITLEN    54
1542 #define BMBT_STARTBLOCK_BITLEN  52
1543 #define BMBT_BLOCKCOUNT_BITLEN  21
1544 
1545 typedef struct xfs_bmbt_rec {
1546         __be64                  l0, l1;
1547 } xfs_bmbt_rec_t;
1548 
1549 typedef __uint64_t      xfs_bmbt_rec_base_t;    /* use this for casts */
1550 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1551 
1552 typedef struct xfs_bmbt_rec_host {
1553         __uint64_t              l0, l1;
1554 } xfs_bmbt_rec_host_t;
1555 
1556 /*
1557  * Values and macros for delayed-allocation startblock fields.
1558  */
1559 #define STARTBLOCKVALBITS       17
1560 #define STARTBLOCKMASKBITS      (15 + 20)
1561 #define STARTBLOCKMASK          \
1562         (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1563 
1564 static inline int isnullstartblock(xfs_fsblock_t x)
1565 {
1566         return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1567 }
1568 
1569 static inline xfs_fsblock_t nullstartblock(int k)
1570 {
1571         ASSERT(k < (1 << STARTBLOCKVALBITS));
1572         return STARTBLOCKMASK | (k);
1573 }
1574 
1575 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1576 {
1577         return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1578 }
1579 
1580 /*
1581  * Possible extent formats.
1582  */
1583 typedef enum {
1584         XFS_EXTFMT_NOSTATE = 0,
1585         XFS_EXTFMT_HASSTATE
1586 } xfs_exntfmt_t;
1587 
1588 /*
1589  * Possible extent states.
1590  */
1591 typedef enum {
1592         XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
1593         XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
1594 } xfs_exntst_t;
1595 
1596 /*
1597  * Incore version of above.
1598  */
1599 typedef struct xfs_bmbt_irec
1600 {
1601         xfs_fileoff_t   br_startoff;    /* starting file offset */
1602         xfs_fsblock_t   br_startblock;  /* starting block number */
1603         xfs_filblks_t   br_blockcount;  /* number of blocks */
1604         xfs_exntst_t    br_state;       /* extent state */
1605 } xfs_bmbt_irec_t;
1606 
1607 /*
1608  * Key structure for non-leaf levels of the tree.
1609  */
1610 typedef struct xfs_bmbt_key {
1611         __be64          br_startoff;    /* starting file offset */
1612 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1613 
1614 /* btree pointer type */
1615 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1616 
1617 
1618 /*
1619  * Generic Btree block format definitions
1620  *
1621  * This is a combination of the actual format used on disk for short and long
1622  * format btrees.  The first three fields are shared by both format, but the
1623  * pointers are different and should be used with care.
1624  *
1625  * To get the size of the actual short or long form headers please use the size
1626  * macros below.  Never use sizeof(xfs_btree_block).
1627  *
1628  * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1629  * with the crc feature bit, and all accesses to them must be conditional on
1630  * that flag.
1631  */
1632 /* short form block header */
1633 struct xfs_btree_block_shdr {
1634         __be32          bb_leftsib;
1635         __be32          bb_rightsib;
1636 
1637         __be64          bb_blkno;
1638         __be64          bb_lsn;
1639         uuid_t          bb_uuid;
1640         __be32          bb_owner;
1641         __le32          bb_crc;
1642 };
1643 
1644 /* long form block header */
1645 struct xfs_btree_block_lhdr {
1646         __be64          bb_leftsib;
1647         __be64          bb_rightsib;
1648 
1649         __be64          bb_blkno;
1650         __be64          bb_lsn;
1651         uuid_t          bb_uuid;
1652         __be64          bb_owner;
1653         __le32          bb_crc;
1654         __be32          bb_pad; /* padding for alignment */
1655 };
1656 
1657 struct xfs_btree_block {
1658         __be32          bb_magic;       /* magic number for block type */
1659         __be16          bb_level;       /* 0 is a leaf */
1660         __be16          bb_numrecs;     /* current # of data records */
1661         union {
1662                 struct xfs_btree_block_shdr s;
1663                 struct xfs_btree_block_lhdr l;
1664         } bb_u;                         /* rest */
1665 };
1666 
1667 /* size of a short form block */
1668 #define XFS_BTREE_SBLOCK_LEN \
1669         (offsetof(struct xfs_btree_block, bb_u) + \
1670          offsetof(struct xfs_btree_block_shdr, bb_blkno))
1671 /* size of a long form block */
1672 #define XFS_BTREE_LBLOCK_LEN \
1673         (offsetof(struct xfs_btree_block, bb_u) + \
1674          offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1675 
1676 /* sizes of CRC enabled btree blocks */
1677 #define XFS_BTREE_SBLOCK_CRC_LEN \
1678         (offsetof(struct xfs_btree_block, bb_u) + \
1679          sizeof(struct xfs_btree_block_shdr))
1680 #define XFS_BTREE_LBLOCK_CRC_LEN \
1681         (offsetof(struct xfs_btree_block, bb_u) + \
1682          sizeof(struct xfs_btree_block_lhdr))
1683 
1684 #define XFS_BTREE_SBLOCK_CRC_OFF \
1685         offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1686 #define XFS_BTREE_LBLOCK_CRC_OFF \
1687         offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1688 
1689 /*
1690  * On-disk XFS access control list structure.
1691  */
1692 struct xfs_acl_entry {
1693         __be32  ae_tag;
1694         __be32  ae_id;
1695         __be16  ae_perm;
1696         __be16  ae_pad;         /* fill the implicit hole in the structure */
1697 };
1698 
1699 struct xfs_acl {
1700         __be32                  acl_cnt;
1701         struct xfs_acl_entry    acl_entry[0];
1702 };
1703 
1704 /*
1705  * The number of ACL entries allowed is defined by the on-disk format.
1706  * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1707  * limited only by the maximum size of the xattr that stores the information.
1708  */
1709 #define XFS_ACL_MAX_ENTRIES(mp) \
1710         (xfs_sb_version_hascrc(&mp->m_sb) \
1711                 ?  (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1712                                                 sizeof(struct xfs_acl_entry) \
1713                 : 25)
1714 
1715 #define XFS_ACL_SIZE(cnt) \
1716         (sizeof(struct xfs_acl) + \
1717                 sizeof(struct xfs_acl_entry) * cnt)
1718 
1719 #define XFS_ACL_MAX_SIZE(mp) \
1720         XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1721 
1722 
1723 /* On-disk XFS extended attribute names */
1724 #define SGI_ACL_FILE            "SGI_ACL_FILE"
1725 #define SGI_ACL_DEFAULT         "SGI_ACL_DEFAULT"
1726 #define SGI_ACL_FILE_SIZE       (sizeof(SGI_ACL_FILE)-1)
1727 #define SGI_ACL_DEFAULT_SIZE    (sizeof(SGI_ACL_DEFAULT)-1)
1728 
1729 #endif /* __XFS_FORMAT_H__ */
1730 

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