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 * Supported feature bit list is just all bits in the versionnum field because 64 * we've used them all up and understand them all. Except, of course, for the 65 * shared superblock bit, which nobody knows what it does and so is unsupported. 66 */ 67 #define XFS_SB_VERSION_OKBITS \ 68 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ 69 ~XFS_SB_VERSION_SHAREDBIT) 70 71 /* 72 * There are two words to hold XFS "feature" bits: the original 73 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 75 * 76 * These defines represent bits in sb_features2. 77 */ 78 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 79 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 80 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 81 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 82 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 83 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 84 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ 85 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ 86 87 #define XFS_SB_VERSION2_OKBITS \ 88 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 89 XFS_SB_VERSION2_ATTR2BIT | \ 90 XFS_SB_VERSION2_PROJID32BIT | \ 91 XFS_SB_VERSION2_FTYPE) 92 93 /* 94 * Superblock - in core version. Must match the ondisk version below. 95 * Must be padded to 64 bit alignment. 96 */ 97 typedef struct xfs_sb { 98 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 99 __uint32_t sb_blocksize; /* logical block size, bytes */ 100 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 101 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 102 xfs_rtblock_t sb_rextents; /* number of realtime extents */ 103 uuid_t sb_uuid; /* file system unique id */ 104 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 105 xfs_ino_t sb_rootino; /* root inode number */ 106 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 107 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 108 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 109 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 110 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 111 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 112 xfs_extlen_t sb_logblocks; /* number of log blocks */ 113 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 114 __uint16_t sb_sectsize; /* volume sector size, bytes */ 115 __uint16_t sb_inodesize; /* inode size, bytes */ 116 __uint16_t sb_inopblock; /* inodes per block */ 117 char sb_fname[12]; /* file system name */ 118 __uint8_t sb_blocklog; /* log2 of sb_blocksize */ 119 __uint8_t sb_sectlog; /* log2 of sb_sectsize */ 120 __uint8_t sb_inodelog; /* log2 of sb_inodesize */ 121 __uint8_t sb_inopblog; /* log2 of sb_inopblock */ 122 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 123 __uint8_t sb_rextslog; /* log2 of sb_rextents */ 124 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 125 __uint8_t sb_imax_pct; /* max % of fs for inode space */ 126 /* statistics */ 127 /* 128 * These fields must remain contiguous. If you really 129 * want to change their layout, make sure you fix the 130 * code in xfs_trans_apply_sb_deltas(). 131 */ 132 __uint64_t sb_icount; /* allocated inodes */ 133 __uint64_t sb_ifree; /* free inodes */ 134 __uint64_t sb_fdblocks; /* free data blocks */ 135 __uint64_t sb_frextents; /* free realtime extents */ 136 /* 137 * End contiguous fields. 138 */ 139 xfs_ino_t sb_uquotino; /* user quota inode */ 140 xfs_ino_t sb_gquotino; /* group quota inode */ 141 __uint16_t sb_qflags; /* quota flags */ 142 __uint8_t sb_flags; /* misc. flags */ 143 __uint8_t sb_shared_vn; /* shared version number */ 144 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 145 __uint32_t sb_unit; /* stripe or raid unit */ 146 __uint32_t sb_width; /* stripe or raid width */ 147 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 148 __uint8_t sb_logsectlog; /* log2 of the log sector size */ 149 __uint16_t sb_logsectsize; /* sector size for the log, bytes */ 150 __uint32_t sb_logsunit; /* stripe unit size for the log */ 151 __uint32_t sb_features2; /* additional feature bits */ 152 153 /* 154 * bad features2 field as a result of failing to pad the sb structure to 155 * 64 bits. Some machines will be using this field for features2 bits. 156 * Easiest just to mark it bad and not use it for anything else. 157 * 158 * This is not kept up to date in memory; it is always overwritten by 159 * the value in sb_features2 when formatting the incore superblock to 160 * the disk buffer. 161 */ 162 __uint32_t sb_bad_features2; 163 164 /* version 5 superblock fields start here */ 165 166 /* feature masks */ 167 __uint32_t sb_features_compat; 168 __uint32_t sb_features_ro_compat; 169 __uint32_t sb_features_incompat; 170 __uint32_t sb_features_log_incompat; 171 172 __uint32_t sb_crc; /* superblock crc */ 173 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ 174 175 xfs_ino_t sb_pquotino; /* project quota inode */ 176 xfs_lsn_t sb_lsn; /* last write sequence */ 177 178 /* must be padded to 64 bit alignment */ 179 } xfs_sb_t; 180 181 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) 182 183 /* 184 * Superblock - on disk version. Must match the in core version above. 185 * Must be padded to 64 bit alignment. 186 */ 187 typedef struct xfs_dsb { 188 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 189 __be32 sb_blocksize; /* logical block size, bytes */ 190 __be64 sb_dblocks; /* number of data blocks */ 191 __be64 sb_rblocks; /* number of realtime blocks */ 192 __be64 sb_rextents; /* number of realtime extents */ 193 uuid_t sb_uuid; /* file system unique id */ 194 __be64 sb_logstart; /* starting block of log if internal */ 195 __be64 sb_rootino; /* root inode number */ 196 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 197 __be64 sb_rsumino; /* summary inode for rt bitmap */ 198 __be32 sb_rextsize; /* realtime extent size, blocks */ 199 __be32 sb_agblocks; /* size of an allocation group */ 200 __be32 sb_agcount; /* number of allocation groups */ 201 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 202 __be32 sb_logblocks; /* number of log blocks */ 203 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 204 __be16 sb_sectsize; /* volume sector size, bytes */ 205 __be16 sb_inodesize; /* inode size, bytes */ 206 __be16 sb_inopblock; /* inodes per block */ 207 char sb_fname[12]; /* file system name */ 208 __u8 sb_blocklog; /* log2 of sb_blocksize */ 209 __u8 sb_sectlog; /* log2 of sb_sectsize */ 210 __u8 sb_inodelog; /* log2 of sb_inodesize */ 211 __u8 sb_inopblog; /* log2 of sb_inopblock */ 212 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 213 __u8 sb_rextslog; /* log2 of sb_rextents */ 214 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 215 __u8 sb_imax_pct; /* max % of fs for inode space */ 216 /* statistics */ 217 /* 218 * These fields must remain contiguous. If you really 219 * want to change their layout, make sure you fix the 220 * code in xfs_trans_apply_sb_deltas(). 221 */ 222 __be64 sb_icount; /* allocated inodes */ 223 __be64 sb_ifree; /* free inodes */ 224 __be64 sb_fdblocks; /* free data blocks */ 225 __be64 sb_frextents; /* free realtime extents */ 226 /* 227 * End contiguous fields. 228 */ 229 __be64 sb_uquotino; /* user quota inode */ 230 __be64 sb_gquotino; /* group quota inode */ 231 __be16 sb_qflags; /* quota flags */ 232 __u8 sb_flags; /* misc. flags */ 233 __u8 sb_shared_vn; /* shared version number */ 234 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 235 __be32 sb_unit; /* stripe or raid unit */ 236 __be32 sb_width; /* stripe or raid width */ 237 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 238 __u8 sb_logsectlog; /* log2 of the log sector size */ 239 __be16 sb_logsectsize; /* sector size for the log, bytes */ 240 __be32 sb_logsunit; /* stripe unit size for the log */ 241 __be32 sb_features2; /* additional feature bits */ 242 /* 243 * bad features2 field as a result of failing to pad the sb 244 * structure to 64 bits. Some machines will be using this field 245 * for features2 bits. Easiest just to mark it bad and not use 246 * it for anything else. 247 */ 248 __be32 sb_bad_features2; 249 250 /* version 5 superblock fields start here */ 251 252 /* feature masks */ 253 __be32 sb_features_compat; 254 __be32 sb_features_ro_compat; 255 __be32 sb_features_incompat; 256 __be32 sb_features_log_incompat; 257 258 __le32 sb_crc; /* superblock crc */ 259 __be32 sb_spino_align; /* sparse inode chunk alignment */ 260 261 __be64 sb_pquotino; /* project quota inode */ 262 __be64 sb_lsn; /* last write sequence */ 263 264 /* must be padded to 64 bit alignment */ 265 } xfs_dsb_t; 266 267 268 /* 269 * Misc. Flags - warning - these will be cleared by xfs_repair unless 270 * a feature bit is set when the flag is used. 271 */ 272 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 273 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 274 275 /* 276 * define max. shared version we can interoperate with 277 */ 278 #define XFS_SB_MAX_SHARED_VN 0 279 280 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 281 282 /* 283 * The first XFS version we support is a v4 superblock with V2 directories. 284 */ 285 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) 286 { 287 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 288 return false; 289 290 /* check for unknown features in the fs */ 291 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 292 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 293 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 294 return false; 295 296 return true; 297 } 298 299 static inline bool xfs_sb_good_version(struct xfs_sb *sbp) 300 { 301 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) 302 return true; 303 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) 304 return xfs_sb_good_v4_features(sbp); 305 return false; 306 } 307 308 /* 309 * Detect a mismatched features2 field. Older kernels read/wrote 310 * this into the wrong slot, so to be safe we keep them in sync. 311 */ 312 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 313 { 314 return sbp->sb_bad_features2 != sbp->sb_features2; 315 } 316 317 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 318 { 319 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 320 } 321 322 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 323 { 324 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 325 } 326 327 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 328 { 329 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 330 } 331 332 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 333 { 334 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 335 } 336 337 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) 338 { 339 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 340 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); 341 } 342 343 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 344 { 345 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 346 } 347 348 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) 349 { 350 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 351 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); 352 } 353 354 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp) 355 { 356 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 357 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT); 358 } 359 360 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 361 { 362 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 363 } 364 365 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 366 { 367 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 368 } 369 370 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 371 { 372 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 373 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 374 } 375 376 /* 377 * sb_features2 bit version macros. 378 */ 379 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) 380 { 381 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 382 (xfs_sb_version_hasmorebits(sbp) && 383 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); 384 } 385 386 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) 387 { 388 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 389 (xfs_sb_version_hasmorebits(sbp) && 390 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); 391 } 392 393 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 394 { 395 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 396 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 397 } 398 399 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) 400 { 401 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; 402 if (!sbp->sb_features2) 403 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; 404 } 405 406 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) 407 { 408 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 409 (xfs_sb_version_hasmorebits(sbp) && 410 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); 411 } 412 413 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) 414 { 415 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 416 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 417 } 418 419 /* 420 * Extended v5 superblock feature masks. These are to be used for new v5 421 * superblock features only. 422 * 423 * Compat features are new features that old kernels will not notice or affect 424 * and so can mount read-write without issues. 425 * 426 * RO-Compat (read only) are features that old kernels can read but will break 427 * if they write. Hence only read-only mounts of such filesystems are allowed on 428 * kernels that don't support the feature bit. 429 * 430 * InCompat features are features which old kernels will not understand and so 431 * must not mount. 432 * 433 * Log-InCompat features are for changes to log formats or new transactions that 434 * can't be replayed on older kernels. The fields are set when the filesystem is 435 * mounted, and a clean unmount clears the fields. 436 */ 437 #define XFS_SB_FEAT_COMPAT_ALL 0 438 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 439 static inline bool 440 xfs_sb_has_compat_feature( 441 struct xfs_sb *sbp, 442 __uint32_t feature) 443 { 444 return (sbp->sb_features_compat & feature) != 0; 445 } 446 447 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 448 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 449 (XFS_SB_FEAT_RO_COMPAT_FINOBT) 450 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 451 static inline bool 452 xfs_sb_has_ro_compat_feature( 453 struct xfs_sb *sbp, 454 __uint32_t feature) 455 { 456 return (sbp->sb_features_ro_compat & feature) != 0; 457 } 458 459 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 460 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 461 #define XFS_SB_FEAT_INCOMPAT_ALL \ 462 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 463 XFS_SB_FEAT_INCOMPAT_SPINODES) 464 465 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 466 static inline bool 467 xfs_sb_has_incompat_feature( 468 struct xfs_sb *sbp, 469 __uint32_t feature) 470 { 471 return (sbp->sb_features_incompat & feature) != 0; 472 } 473 474 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 475 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 476 static inline bool 477 xfs_sb_has_incompat_log_feature( 478 struct xfs_sb *sbp, 479 __uint32_t feature) 480 { 481 return (sbp->sb_features_log_incompat & feature) != 0; 482 } 483 484 /* 485 * V5 superblock specific feature checks 486 */ 487 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 488 { 489 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 490 } 491 492 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 493 { 494 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 495 } 496 497 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 498 { 499 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 500 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 501 (xfs_sb_version_hasmorebits(sbp) && 502 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 503 } 504 505 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 506 { 507 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 508 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 509 } 510 511 static inline bool xfs_sb_version_hassparseinodes(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_SPINODES); 515 } 516 517 /* 518 * end of superblock version macros 519 */ 520 521 static inline bool 522 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 523 { 524 return (ino == sbp->sb_uquotino || 525 ino == sbp->sb_gquotino || 526 ino == sbp->sb_pquotino); 527 } 528 529 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 530 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 531 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 532 533 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 534 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 535 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 536 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 537 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 538 539 /* 540 * File system sector to basic block conversions. 541 */ 542 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 543 544 /* 545 * File system block to basic block conversions. 546 */ 547 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 548 #define XFS_BB_TO_FSB(mp,bb) \ 549 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 550 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 551 552 /* 553 * File system block to byte conversions. 554 */ 555 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 556 #define XFS_B_TO_FSB(mp,b) \ 557 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 558 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 559 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 560 561 /* 562 * Allocation group header 563 * 564 * This is divided into three structures, placed in sequential 512-byte 565 * buffers after a copy of the superblock (also in a 512-byte buffer). 566 */ 567 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 568 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 569 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 570 #define XFS_AGF_VERSION 1 571 #define XFS_AGI_VERSION 1 572 573 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 574 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 575 576 /* 577 * Btree number 0 is bno, 1 is cnt. This value gives the size of the 578 * arrays below. 579 */ 580 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) 581 582 /* 583 * The second word of agf_levels in the first a.g. overlaps the EFS 584 * superblock's magic number. Since the magic numbers valid for EFS 585 * are > 64k, our value cannot be confused for an EFS superblock's. 586 */ 587 588 typedef struct xfs_agf { 589 /* 590 * Common allocation group header information 591 */ 592 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 593 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 594 __be32 agf_seqno; /* sequence # starting from 0 */ 595 __be32 agf_length; /* size in blocks of a.g. */ 596 /* 597 * Freespace information 598 */ 599 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 600 __be32 agf_spare0; /* spare field */ 601 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 602 __be32 agf_spare1; /* spare field */ 603 604 __be32 agf_flfirst; /* first freelist block's index */ 605 __be32 agf_fllast; /* last freelist block's index */ 606 __be32 agf_flcount; /* count of blocks in freelist */ 607 __be32 agf_freeblks; /* total free blocks */ 608 609 __be32 agf_longest; /* longest free space */ 610 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 611 uuid_t agf_uuid; /* uuid of filesystem */ 612 613 /* 614 * reserve some contiguous space for future logged fields before we add 615 * the unlogged fields. This makes the range logging via flags and 616 * structure offsets much simpler. 617 */ 618 __be64 agf_spare64[16]; 619 620 /* unlogged fields, written during buffer writeback. */ 621 __be64 agf_lsn; /* last write sequence */ 622 __be32 agf_crc; /* crc of agf sector */ 623 __be32 agf_spare2; 624 625 /* structure must be padded to 64 bit alignment */ 626 } xfs_agf_t; 627 628 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 629 630 #define XFS_AGF_MAGICNUM 0x00000001 631 #define XFS_AGF_VERSIONNUM 0x00000002 632 #define XFS_AGF_SEQNO 0x00000004 633 #define XFS_AGF_LENGTH 0x00000008 634 #define XFS_AGF_ROOTS 0x00000010 635 #define XFS_AGF_LEVELS 0x00000020 636 #define XFS_AGF_FLFIRST 0x00000040 637 #define XFS_AGF_FLLAST 0x00000080 638 #define XFS_AGF_FLCOUNT 0x00000100 639 #define XFS_AGF_FREEBLKS 0x00000200 640 #define XFS_AGF_LONGEST 0x00000400 641 #define XFS_AGF_BTREEBLKS 0x00000800 642 #define XFS_AGF_UUID 0x00001000 643 #define XFS_AGF_NUM_BITS 13 644 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 645 646 #define XFS_AGF_FLAGS \ 647 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 648 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 649 { XFS_AGF_SEQNO, "SEQNO" }, \ 650 { XFS_AGF_LENGTH, "LENGTH" }, \ 651 { XFS_AGF_ROOTS, "ROOTS" }, \ 652 { XFS_AGF_LEVELS, "LEVELS" }, \ 653 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 654 { XFS_AGF_FLLAST, "FLLAST" }, \ 655 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 656 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 657 { XFS_AGF_LONGEST, "LONGEST" }, \ 658 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 659 { XFS_AGF_UUID, "UUID" } 660 661 /* disk block (xfs_daddr_t) in the AG */ 662 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 663 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 664 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 665 666 /* 667 * Size of the unlinked inode hash table in the agi. 668 */ 669 #define XFS_AGI_UNLINKED_BUCKETS 64 670 671 typedef struct xfs_agi { 672 /* 673 * Common allocation group header information 674 */ 675 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 676 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 677 __be32 agi_seqno; /* sequence # starting from 0 */ 678 __be32 agi_length; /* size in blocks of a.g. */ 679 /* 680 * Inode information 681 * Inodes are mapped by interpreting the inode number, so no 682 * mapping data is needed here. 683 */ 684 __be32 agi_count; /* count of allocated inodes */ 685 __be32 agi_root; /* root of inode btree */ 686 __be32 agi_level; /* levels in inode btree */ 687 __be32 agi_freecount; /* number of free inodes */ 688 689 __be32 agi_newino; /* new inode just allocated */ 690 __be32 agi_dirino; /* last directory inode chunk */ 691 /* 692 * Hash table of inodes which have been unlinked but are 693 * still being referenced. 694 */ 695 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 696 /* 697 * This marks the end of logging region 1 and start of logging region 2. 698 */ 699 uuid_t agi_uuid; /* uuid of filesystem */ 700 __be32 agi_crc; /* crc of agi sector */ 701 __be32 agi_pad32; 702 __be64 agi_lsn; /* last write sequence */ 703 704 __be32 agi_free_root; /* root of the free inode btree */ 705 __be32 agi_free_level;/* levels in free inode btree */ 706 707 /* structure must be padded to 64 bit alignment */ 708 } xfs_agi_t; 709 710 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 711 712 #define XFS_AGI_MAGICNUM (1 << 0) 713 #define XFS_AGI_VERSIONNUM (1 << 1) 714 #define XFS_AGI_SEQNO (1 << 2) 715 #define XFS_AGI_LENGTH (1 << 3) 716 #define XFS_AGI_COUNT (1 << 4) 717 #define XFS_AGI_ROOT (1 << 5) 718 #define XFS_AGI_LEVEL (1 << 6) 719 #define XFS_AGI_FREECOUNT (1 << 7) 720 #define XFS_AGI_NEWINO (1 << 8) 721 #define XFS_AGI_DIRINO (1 << 9) 722 #define XFS_AGI_UNLINKED (1 << 10) 723 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 724 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 725 #define XFS_AGI_FREE_ROOT (1 << 11) 726 #define XFS_AGI_FREE_LEVEL (1 << 12) 727 #define XFS_AGI_NUM_BITS_R2 13 728 729 /* disk block (xfs_daddr_t) in the AG */ 730 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 731 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 732 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 733 734 /* 735 * The third a.g. block contains the a.g. freelist, an array 736 * of block pointers to blocks owned by the allocation btree code. 737 */ 738 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 739 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 740 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 741 742 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 743 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 744 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 745 (__be32 *)(bp)->b_addr) 746 747 /* 748 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 749 * slots in the beginning of the block for a proper header with the 750 * location information and CRC. 751 */ 752 #define XFS_AGFL_SIZE(mp) \ 753 (((mp)->m_sb.sb_sectsize - \ 754 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 755 sizeof(struct xfs_agfl) : 0)) / \ 756 sizeof(xfs_agblock_t)) 757 758 typedef struct xfs_agfl { 759 __be32 agfl_magicnum; 760 __be32 agfl_seqno; 761 uuid_t agfl_uuid; 762 __be64 agfl_lsn; 763 __be32 agfl_crc; 764 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 765 } xfs_agfl_t; 766 767 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 768 769 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 770 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 771 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 772 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 773 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 774 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 775 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 776 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 777 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 778 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 779 780 /* 781 * For checking for bad ranges of xfs_daddr_t's, covering multiple 782 * allocation groups or a single xfs_daddr_t that's a superblock copy. 783 */ 784 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 785 ((len) == 1 ? \ 786 ASSERT((d) == XFS_SB_DADDR || \ 787 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 788 ASSERT(xfs_daddr_to_agno(mp, d) == \ 789 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 790 791 typedef struct xfs_timestamp { 792 __be32 t_sec; /* timestamp seconds */ 793 __be32 t_nsec; /* timestamp nanoseconds */ 794 } xfs_timestamp_t; 795 796 /* 797 * On-disk inode structure. 798 * 799 * This is just the header or "dinode core", the inode is expanded to fill a 800 * variable size the leftover area split into a data and an attribute fork. 801 * The format of the data and attribute fork depends on the format of the 802 * inode as indicated by di_format and di_aformat. To access the data and 803 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 804 * below. 805 * 806 * There is a very similar struct icdinode in xfs_inode which matches the 807 * layout of the first 96 bytes of this structure, but is kept in native 808 * format instead of big endian. 809 * 810 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 811 * padding field for v3 inodes. 812 */ 813 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 814 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 815 typedef struct xfs_dinode { 816 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 817 __be16 di_mode; /* mode and type of file */ 818 __u8 di_version; /* inode version */ 819 __u8 di_format; /* format of di_c data */ 820 __be16 di_onlink; /* old number of links to file */ 821 __be32 di_uid; /* owner's user id */ 822 __be32 di_gid; /* owner's group id */ 823 __be32 di_nlink; /* number of links to file */ 824 __be16 di_projid_lo; /* lower part of owner's project id */ 825 __be16 di_projid_hi; /* higher part owner's project id */ 826 __u8 di_pad[6]; /* unused, zeroed space */ 827 __be16 di_flushiter; /* incremented on flush */ 828 xfs_timestamp_t di_atime; /* time last accessed */ 829 xfs_timestamp_t di_mtime; /* time last modified */ 830 xfs_timestamp_t di_ctime; /* time created/inode modified */ 831 __be64 di_size; /* number of bytes in file */ 832 __be64 di_nblocks; /* # of direct & btree blocks used */ 833 __be32 di_extsize; /* basic/minimum extent size for file */ 834 __be32 di_nextents; /* number of extents in data fork */ 835 __be16 di_anextents; /* number of extents in attribute fork*/ 836 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 837 __s8 di_aformat; /* format of attr fork's data */ 838 __be32 di_dmevmask; /* DMIG event mask */ 839 __be16 di_dmstate; /* DMIG state info */ 840 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 841 __be32 di_gen; /* generation number */ 842 843 /* di_next_unlinked is the only non-core field in the old dinode */ 844 __be32 di_next_unlinked;/* agi unlinked list ptr */ 845 846 /* start of the extended dinode, writable fields */ 847 __le32 di_crc; /* CRC of the inode */ 848 __be64 di_changecount; /* number of attribute changes */ 849 __be64 di_lsn; /* flush sequence */ 850 __be64 di_flags2; /* more random flags */ 851 __u8 di_pad2[16]; /* more padding for future expansion */ 852 853 /* fields only written to during inode creation */ 854 xfs_timestamp_t di_crtime; /* time created */ 855 __be64 di_ino; /* inode number */ 856 uuid_t di_uuid; /* UUID of the filesystem */ 857 858 /* structure must be padded to 64 bit alignment */ 859 } xfs_dinode_t; 860 861 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 862 863 #define DI_MAX_FLUSH 0xffff 864 865 /* 866 * Size of the core inode on disk. Version 1 and 2 inodes have 867 * the same size, but version 3 has grown a few additional fields. 868 */ 869 static inline uint xfs_dinode_size(int version) 870 { 871 if (version == 3) 872 return sizeof(struct xfs_dinode); 873 return offsetof(struct xfs_dinode, di_crc); 874 } 875 876 /* 877 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 878 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 879 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 880 */ 881 #define XFS_MAXLINK ((1U << 31) - 1U) 882 #define XFS_MAXLINK_1 65535U 883 884 /* 885 * Values for di_format 886 */ 887 typedef enum xfs_dinode_fmt { 888 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 889 XFS_DINODE_FMT_LOCAL, /* bulk data */ 890 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 891 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 892 XFS_DINODE_FMT_UUID /* uuid_t */ 893 } xfs_dinode_fmt_t; 894 895 /* 896 * Inode minimum and maximum sizes. 897 */ 898 #define XFS_DINODE_MIN_LOG 8 899 #define XFS_DINODE_MAX_LOG 11 900 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 901 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 902 903 /* 904 * Inode size for given fs. 905 */ 906 #define XFS_LITINO(mp, version) \ 907 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 908 909 /* 910 * Inode data & attribute fork sizes, per inode. 911 */ 912 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 913 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 914 915 #define XFS_DFORK_DSIZE(dip,mp) \ 916 (XFS_DFORK_Q(dip) ? \ 917 XFS_DFORK_BOFF(dip) : \ 918 XFS_LITINO(mp, (dip)->di_version)) 919 #define XFS_DFORK_ASIZE(dip,mp) \ 920 (XFS_DFORK_Q(dip) ? \ 921 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 922 0) 923 #define XFS_DFORK_SIZE(dip,mp,w) \ 924 ((w) == XFS_DATA_FORK ? \ 925 XFS_DFORK_DSIZE(dip, mp) : \ 926 XFS_DFORK_ASIZE(dip, mp)) 927 928 /* 929 * Return pointers to the data or attribute forks. 930 */ 931 #define XFS_DFORK_DPTR(dip) \ 932 ((char *)dip + xfs_dinode_size(dip->di_version)) 933 #define XFS_DFORK_APTR(dip) \ 934 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 935 #define XFS_DFORK_PTR(dip,w) \ 936 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 937 938 #define XFS_DFORK_FORMAT(dip,w) \ 939 ((w) == XFS_DATA_FORK ? \ 940 (dip)->di_format : \ 941 (dip)->di_aformat) 942 #define XFS_DFORK_NEXTENTS(dip,w) \ 943 ((w) == XFS_DATA_FORK ? \ 944 be32_to_cpu((dip)->di_nextents) : \ 945 be16_to_cpu((dip)->di_anextents)) 946 947 /* 948 * For block and character special files the 32bit dev_t is stored at the 949 * beginning of the data fork. 950 */ 951 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 952 { 953 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 954 } 955 956 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 957 { 958 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 959 } 960 961 /* 962 * Values for di_flags 963 * There should be a one-to-one correspondence between these flags and the 964 * XFS_XFLAG_s. 965 */ 966 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 967 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 968 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 969 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 970 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 971 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 972 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 973 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 974 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 975 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 976 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 977 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 978 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 979 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 980 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 981 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 982 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 983 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 984 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 985 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 986 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 987 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 988 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 989 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 990 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 991 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 992 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 993 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 994 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 995 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 996 997 #define XFS_DIFLAG_ANY \ 998 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 999 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1000 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1001 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1002 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1003 1004 /* 1005 * Inode number format: 1006 * low inopblog bits - offset in block 1007 * next agblklog bits - block number in ag 1008 * next agno_log bits - ag number 1009 * high agno_log-agblklog-inopblog bits - 0 1010 */ 1011 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1012 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1013 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1014 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1015 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1016 #define XFS_INO_BITS(mp) \ 1017 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1018 #define XFS_INO_TO_AGNO(mp,i) \ 1019 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1020 #define XFS_INO_TO_AGINO(mp,i) \ 1021 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1022 #define XFS_INO_TO_AGBNO(mp,i) \ 1023 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1024 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1025 #define XFS_INO_TO_OFFSET(mp,i) \ 1026 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1027 #define XFS_INO_TO_FSB(mp,i) \ 1028 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1029 #define XFS_AGINO_TO_INO(mp,a,i) \ 1030 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1031 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1032 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1033 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1034 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1035 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1036 1037 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1038 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1039 1040 /* 1041 * RealTime Device format definitions 1042 */ 1043 1044 /* Min and max rt extent sizes, specified in bytes */ 1045 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1046 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1047 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1048 1049 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1050 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1051 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1052 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1053 1054 /* 1055 * RT Summary and bit manipulation macros. 1056 */ 1057 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1058 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1059 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1060 #define XFS_SUMPTR(mp,bp,so) \ 1061 ((xfs_suminfo_t *)((bp)->b_addr + \ 1062 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1063 1064 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1065 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1066 #define XFS_BITTOWORD(mp,bi) \ 1067 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1068 1069 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1070 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1071 1072 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1073 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1074 1075 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1076 1077 /* 1078 * Dquot and dquot block format definitions 1079 */ 1080 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1081 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1082 1083 /* 1084 * This is the main portion of the on-disk representation of quota 1085 * information for a user. This is the q_core of the xfs_dquot_t that 1086 * is kept in kernel memory. We pad this with some more expansion room 1087 * to construct the on disk structure. 1088 */ 1089 typedef struct xfs_disk_dquot { 1090 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1091 __u8 d_version; /* dquot version */ 1092 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1093 __be32 d_id; /* user,project,group id */ 1094 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1095 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1096 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1097 __be64 d_ino_softlimit;/* preferred inode limit */ 1098 __be64 d_bcount; /* disk blocks owned by the user */ 1099 __be64 d_icount; /* inodes owned by the user */ 1100 __be32 d_itimer; /* zero if within inode limits if not, 1101 this is when we refuse service */ 1102 __be32 d_btimer; /* similar to above; for disk blocks */ 1103 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1104 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1105 __be32 d_pad0; /* 64 bit align */ 1106 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1107 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1108 __be64 d_rtbcount; /* realtime blocks owned */ 1109 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1110 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1111 __be16 d_pad; 1112 } xfs_disk_dquot_t; 1113 1114 /* 1115 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1116 * carrying the unnecessary padding would be a waste of memory. 1117 */ 1118 typedef struct xfs_dqblk { 1119 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1120 char dd_fill[4]; /* filling for posterity */ 1121 1122 /* 1123 * These two are only present on filesystems with the CRC bits set. 1124 */ 1125 __be32 dd_crc; /* checksum */ 1126 __be64 dd_lsn; /* last modification in log */ 1127 uuid_t dd_uuid; /* location information */ 1128 } xfs_dqblk_t; 1129 1130 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1131 1132 /* 1133 * Remote symlink format and access functions. 1134 */ 1135 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1136 1137 struct xfs_dsymlink_hdr { 1138 __be32 sl_magic; 1139 __be32 sl_offset; 1140 __be32 sl_bytes; 1141 __be32 sl_crc; 1142 uuid_t sl_uuid; 1143 __be64 sl_owner; 1144 __be64 sl_blkno; 1145 __be64 sl_lsn; 1146 }; 1147 1148 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1149 1150 /* 1151 * The maximum pathlen is 1024 bytes. Since the minimum file system 1152 * blocksize is 512 bytes, we can get a max of 3 extents back from 1153 * bmapi when crc headers are taken into account. 1154 */ 1155 #define XFS_SYMLINK_MAPS 3 1156 1157 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1158 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1159 sizeof(struct xfs_dsymlink_hdr) : 0)) 1160 1161 1162 /* 1163 * Allocation Btree format definitions 1164 * 1165 * There are two on-disk btrees, one sorted by blockno and one sorted 1166 * by blockcount and blockno. All blocks look the same to make the code 1167 * simpler; if we have time later, we'll make the optimizations. 1168 */ 1169 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1170 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1171 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1172 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1173 1174 /* 1175 * Data record/key structure 1176 */ 1177 typedef struct xfs_alloc_rec { 1178 __be32 ar_startblock; /* starting block number */ 1179 __be32 ar_blockcount; /* count of free blocks */ 1180 } xfs_alloc_rec_t, xfs_alloc_key_t; 1181 1182 typedef struct xfs_alloc_rec_incore { 1183 xfs_agblock_t ar_startblock; /* starting block number */ 1184 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1185 } xfs_alloc_rec_incore_t; 1186 1187 /* btree pointer type */ 1188 typedef __be32 xfs_alloc_ptr_t; 1189 1190 /* 1191 * Block numbers in the AG: 1192 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1193 */ 1194 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1195 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1196 1197 1198 /* 1199 * Inode Allocation Btree format definitions 1200 * 1201 * There is a btree for the inode map per allocation group. 1202 */ 1203 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1204 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1205 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1206 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1207 1208 typedef __uint64_t xfs_inofree_t; 1209 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1210 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1211 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1212 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1213 1214 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1215 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1216 #define XFS_INODES_PER_HOLEMASK_BIT \ 1217 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1218 1219 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1220 { 1221 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1222 } 1223 1224 /* 1225 * The on-disk inode record structure has two formats. The original "full" 1226 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1227 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1228 * count. 1229 * 1230 * The holemask of the sparse record format allows an inode chunk to have holes 1231 * that refer to blocks not owned by the inode record. This facilitates inode 1232 * allocation in the event of severe free space fragmentation. 1233 */ 1234 typedef struct xfs_inobt_rec { 1235 __be32 ir_startino; /* starting inode number */ 1236 union { 1237 struct { 1238 __be32 ir_freecount; /* count of free inodes */ 1239 } f; 1240 struct { 1241 __be16 ir_holemask;/* hole mask for sparse chunks */ 1242 __u8 ir_count; /* total inode count */ 1243 __u8 ir_freecount; /* count of free inodes */ 1244 } sp; 1245 } ir_u; 1246 __be64 ir_free; /* free inode mask */ 1247 } xfs_inobt_rec_t; 1248 1249 typedef struct xfs_inobt_rec_incore { 1250 xfs_agino_t ir_startino; /* starting inode number */ 1251 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1252 __uint8_t ir_count; /* total inode count */ 1253 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1254 xfs_inofree_t ir_free; /* free inode mask */ 1255 } xfs_inobt_rec_incore_t; 1256 1257 static inline bool xfs_inobt_issparse(uint16_t holemask) 1258 { 1259 /* non-zero holemask represents a sparse rec. */ 1260 return holemask; 1261 } 1262 1263 /* 1264 * Key structure 1265 */ 1266 typedef struct xfs_inobt_key { 1267 __be32 ir_startino; /* starting inode number */ 1268 } xfs_inobt_key_t; 1269 1270 /* btree pointer type */ 1271 typedef __be32 xfs_inobt_ptr_t; 1272 1273 /* 1274 * block numbers in the AG. 1275 */ 1276 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1277 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1278 1279 /* 1280 * The first data block of an AG depends on whether the filesystem was formatted 1281 * with the finobt feature. If so, account for the finobt reserved root btree 1282 * block. 1283 */ 1284 #define XFS_PREALLOC_BLOCKS(mp) \ 1285 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1286 XFS_FIBT_BLOCK(mp) + 1 : \ 1287 XFS_IBT_BLOCK(mp) + 1) 1288 1289 1290 1291 /* 1292 * BMAP Btree format definitions 1293 * 1294 * This includes both the root block definition that sits inside an inode fork 1295 * and the record/pointer formats for the leaf/node in the blocks. 1296 */ 1297 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1298 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1299 1300 /* 1301 * Bmap root header, on-disk form only. 1302 */ 1303 typedef struct xfs_bmdr_block { 1304 __be16 bb_level; /* 0 is a leaf */ 1305 __be16 bb_numrecs; /* current # of data records */ 1306 } xfs_bmdr_block_t; 1307 1308 /* 1309 * Bmap btree record and extent descriptor. 1310 * l0:63 is an extent flag (value 1 indicates non-normal). 1311 * l0:9-62 are startoff. 1312 * l0:0-8 and l1:21-63 are startblock. 1313 * l1:0-20 are blockcount. 1314 */ 1315 #define BMBT_EXNTFLAG_BITLEN 1 1316 #define BMBT_STARTOFF_BITLEN 54 1317 #define BMBT_STARTBLOCK_BITLEN 52 1318 #define BMBT_BLOCKCOUNT_BITLEN 21 1319 1320 typedef struct xfs_bmbt_rec { 1321 __be64 l0, l1; 1322 } xfs_bmbt_rec_t; 1323 1324 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1325 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1326 1327 typedef struct xfs_bmbt_rec_host { 1328 __uint64_t l0, l1; 1329 } xfs_bmbt_rec_host_t; 1330 1331 /* 1332 * Values and macros for delayed-allocation startblock fields. 1333 */ 1334 #define STARTBLOCKVALBITS 17 1335 #define STARTBLOCKMASKBITS (15 + 20) 1336 #define STARTBLOCKMASK \ 1337 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1338 1339 static inline int isnullstartblock(xfs_fsblock_t x) 1340 { 1341 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1342 } 1343 1344 static inline xfs_fsblock_t nullstartblock(int k) 1345 { 1346 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1347 return STARTBLOCKMASK | (k); 1348 } 1349 1350 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1351 { 1352 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1353 } 1354 1355 /* 1356 * Possible extent formats. 1357 */ 1358 typedef enum { 1359 XFS_EXTFMT_NOSTATE = 0, 1360 XFS_EXTFMT_HASSTATE 1361 } xfs_exntfmt_t; 1362 1363 /* 1364 * Possible extent states. 1365 */ 1366 typedef enum { 1367 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1368 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1369 } xfs_exntst_t; 1370 1371 /* 1372 * Incore version of above. 1373 */ 1374 typedef struct xfs_bmbt_irec 1375 { 1376 xfs_fileoff_t br_startoff; /* starting file offset */ 1377 xfs_fsblock_t br_startblock; /* starting block number */ 1378 xfs_filblks_t br_blockcount; /* number of blocks */ 1379 xfs_exntst_t br_state; /* extent state */ 1380 } xfs_bmbt_irec_t; 1381 1382 /* 1383 * Key structure for non-leaf levels of the tree. 1384 */ 1385 typedef struct xfs_bmbt_key { 1386 __be64 br_startoff; /* starting file offset */ 1387 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1388 1389 /* btree pointer type */ 1390 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1391 1392 1393 /* 1394 * Generic Btree block format definitions 1395 * 1396 * This is a combination of the actual format used on disk for short and long 1397 * format btrees. The first three fields are shared by both format, but the 1398 * pointers are different and should be used with care. 1399 * 1400 * To get the size of the actual short or long form headers please use the size 1401 * macros below. Never use sizeof(xfs_btree_block). 1402 * 1403 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1404 * with the crc feature bit, and all accesses to them must be conditional on 1405 * that flag. 1406 */ 1407 struct xfs_btree_block { 1408 __be32 bb_magic; /* magic number for block type */ 1409 __be16 bb_level; /* 0 is a leaf */ 1410 __be16 bb_numrecs; /* current # of data records */ 1411 union { 1412 struct { 1413 __be32 bb_leftsib; 1414 __be32 bb_rightsib; 1415 1416 __be64 bb_blkno; 1417 __be64 bb_lsn; 1418 uuid_t bb_uuid; 1419 __be32 bb_owner; 1420 __le32 bb_crc; 1421 } s; /* short form pointers */ 1422 struct { 1423 __be64 bb_leftsib; 1424 __be64 bb_rightsib; 1425 1426 __be64 bb_blkno; 1427 __be64 bb_lsn; 1428 uuid_t bb_uuid; 1429 __be64 bb_owner; 1430 __le32 bb_crc; 1431 __be32 bb_pad; /* padding for alignment */ 1432 } l; /* long form pointers */ 1433 } bb_u; /* rest */ 1434 }; 1435 1436 #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ 1437 #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ 1438 1439 /* sizes of CRC enabled btree blocks */ 1440 #define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) 1441 #define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) 1442 1443 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1444 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1445 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1446 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1447 1448 /* 1449 * On-disk XFS access control list structure. 1450 */ 1451 struct xfs_acl_entry { 1452 __be32 ae_tag; 1453 __be32 ae_id; 1454 __be16 ae_perm; 1455 __be16 ae_pad; /* fill the implicit hole in the structure */ 1456 }; 1457 1458 struct xfs_acl { 1459 __be32 acl_cnt; 1460 struct xfs_acl_entry acl_entry[0]; 1461 }; 1462 1463 /* 1464 * The number of ACL entries allowed is defined by the on-disk format. 1465 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1466 * limited only by the maximum size of the xattr that stores the information. 1467 */ 1468 #define XFS_ACL_MAX_ENTRIES(mp) \ 1469 (xfs_sb_version_hascrc(&mp->m_sb) \ 1470 ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1471 sizeof(struct xfs_acl_entry) \ 1472 : 25) 1473 1474 #define XFS_ACL_MAX_SIZE(mp) \ 1475 (sizeof(struct xfs_acl) + \ 1476 sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp))) 1477 1478 /* On-disk XFS extended attribute names */ 1479 #define SGI_ACL_FILE "SGI_ACL_FILE" 1480 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1481 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1482 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1483 1484 #endif /* __XFS_FORMAT_H__ */ 1485