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_ALL \ 459 (XFS_SB_FEAT_RO_COMPAT_FINOBT) 460 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 461 static inline bool 462 xfs_sb_has_ro_compat_feature( 463 struct xfs_sb *sbp, 464 __uint32_t feature) 465 { 466 return (sbp->sb_features_ro_compat & feature) != 0; 467 } 468 469 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 470 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 471 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 472 #define XFS_SB_FEAT_INCOMPAT_ALL \ 473 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 474 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 475 XFS_SB_FEAT_INCOMPAT_META_UUID) 476 477 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 478 static inline bool 479 xfs_sb_has_incompat_feature( 480 struct xfs_sb *sbp, 481 __uint32_t feature) 482 { 483 return (sbp->sb_features_incompat & feature) != 0; 484 } 485 486 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 487 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 488 static inline bool 489 xfs_sb_has_incompat_log_feature( 490 struct xfs_sb *sbp, 491 __uint32_t feature) 492 { 493 return (sbp->sb_features_log_incompat & feature) != 0; 494 } 495 496 /* 497 * V5 superblock specific feature checks 498 */ 499 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 500 { 501 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 502 } 503 504 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 505 { 506 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 507 } 508 509 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 510 { 511 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 512 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 513 (xfs_sb_version_hasmorebits(sbp) && 514 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 515 } 516 517 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 518 { 519 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 520 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 521 } 522 523 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 524 { 525 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 526 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 527 } 528 529 /* 530 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 531 * is stored separately from the user-visible UUID; this allows the 532 * user-visible UUID to be changed on V5 filesystems which have a 533 * filesystem UUID stamped into every piece of metadata. 534 */ 535 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 536 { 537 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 538 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 539 } 540 541 /* 542 * end of superblock version macros 543 */ 544 545 static inline bool 546 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 547 { 548 return (ino == sbp->sb_uquotino || 549 ino == sbp->sb_gquotino || 550 ino == sbp->sb_pquotino); 551 } 552 553 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 554 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 555 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 556 557 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 558 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 559 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 560 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 561 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 562 563 /* 564 * File system sector to basic block conversions. 565 */ 566 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 567 568 /* 569 * File system block to basic block conversions. 570 */ 571 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 572 #define XFS_BB_TO_FSB(mp,bb) \ 573 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 574 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 575 576 /* 577 * File system block to byte conversions. 578 */ 579 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 580 #define XFS_B_TO_FSB(mp,b) \ 581 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 582 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 583 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 584 585 /* 586 * Allocation group header 587 * 588 * This is divided into three structures, placed in sequential 512-byte 589 * buffers after a copy of the superblock (also in a 512-byte buffer). 590 */ 591 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 592 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 593 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 594 #define XFS_AGF_VERSION 1 595 #define XFS_AGI_VERSION 1 596 597 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 598 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 599 600 /* 601 * Btree number 0 is bno, 1 is cnt. This value gives the size of the 602 * arrays below. 603 */ 604 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) 605 606 /* 607 * The second word of agf_levels in the first a.g. overlaps the EFS 608 * superblock's magic number. Since the magic numbers valid for EFS 609 * are > 64k, our value cannot be confused for an EFS superblock's. 610 */ 611 612 typedef struct xfs_agf { 613 /* 614 * Common allocation group header information 615 */ 616 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 617 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 618 __be32 agf_seqno; /* sequence # starting from 0 */ 619 __be32 agf_length; /* size in blocks of a.g. */ 620 /* 621 * Freespace information 622 */ 623 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 624 __be32 agf_spare0; /* spare field */ 625 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 626 __be32 agf_spare1; /* spare field */ 627 628 __be32 agf_flfirst; /* first freelist block's index */ 629 __be32 agf_fllast; /* last freelist block's index */ 630 __be32 agf_flcount; /* count of blocks in freelist */ 631 __be32 agf_freeblks; /* total free blocks */ 632 633 __be32 agf_longest; /* longest free space */ 634 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 635 uuid_t agf_uuid; /* uuid of filesystem */ 636 637 /* 638 * reserve some contiguous space for future logged fields before we add 639 * the unlogged fields. This makes the range logging via flags and 640 * structure offsets much simpler. 641 */ 642 __be64 agf_spare64[16]; 643 644 /* unlogged fields, written during buffer writeback. */ 645 __be64 agf_lsn; /* last write sequence */ 646 __be32 agf_crc; /* crc of agf sector */ 647 __be32 agf_spare2; 648 649 /* structure must be padded to 64 bit alignment */ 650 } xfs_agf_t; 651 652 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 653 654 #define XFS_AGF_MAGICNUM 0x00000001 655 #define XFS_AGF_VERSIONNUM 0x00000002 656 #define XFS_AGF_SEQNO 0x00000004 657 #define XFS_AGF_LENGTH 0x00000008 658 #define XFS_AGF_ROOTS 0x00000010 659 #define XFS_AGF_LEVELS 0x00000020 660 #define XFS_AGF_FLFIRST 0x00000040 661 #define XFS_AGF_FLLAST 0x00000080 662 #define XFS_AGF_FLCOUNT 0x00000100 663 #define XFS_AGF_FREEBLKS 0x00000200 664 #define XFS_AGF_LONGEST 0x00000400 665 #define XFS_AGF_BTREEBLKS 0x00000800 666 #define XFS_AGF_UUID 0x00001000 667 #define XFS_AGF_NUM_BITS 13 668 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 669 670 #define XFS_AGF_FLAGS \ 671 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 672 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 673 { XFS_AGF_SEQNO, "SEQNO" }, \ 674 { XFS_AGF_LENGTH, "LENGTH" }, \ 675 { XFS_AGF_ROOTS, "ROOTS" }, \ 676 { XFS_AGF_LEVELS, "LEVELS" }, \ 677 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 678 { XFS_AGF_FLLAST, "FLLAST" }, \ 679 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 680 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 681 { XFS_AGF_LONGEST, "LONGEST" }, \ 682 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 683 { XFS_AGF_UUID, "UUID" } 684 685 /* disk block (xfs_daddr_t) in the AG */ 686 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 687 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 688 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 689 690 /* 691 * Size of the unlinked inode hash table in the agi. 692 */ 693 #define XFS_AGI_UNLINKED_BUCKETS 64 694 695 typedef struct xfs_agi { 696 /* 697 * Common allocation group header information 698 */ 699 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 700 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 701 __be32 agi_seqno; /* sequence # starting from 0 */ 702 __be32 agi_length; /* size in blocks of a.g. */ 703 /* 704 * Inode information 705 * Inodes are mapped by interpreting the inode number, so no 706 * mapping data is needed here. 707 */ 708 __be32 agi_count; /* count of allocated inodes */ 709 __be32 agi_root; /* root of inode btree */ 710 __be32 agi_level; /* levels in inode btree */ 711 __be32 agi_freecount; /* number of free inodes */ 712 713 __be32 agi_newino; /* new inode just allocated */ 714 __be32 agi_dirino; /* last directory inode chunk */ 715 /* 716 * Hash table of inodes which have been unlinked but are 717 * still being referenced. 718 */ 719 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 720 /* 721 * This marks the end of logging region 1 and start of logging region 2. 722 */ 723 uuid_t agi_uuid; /* uuid of filesystem */ 724 __be32 agi_crc; /* crc of agi sector */ 725 __be32 agi_pad32; 726 __be64 agi_lsn; /* last write sequence */ 727 728 __be32 agi_free_root; /* root of the free inode btree */ 729 __be32 agi_free_level;/* levels in free inode btree */ 730 731 /* structure must be padded to 64 bit alignment */ 732 } xfs_agi_t; 733 734 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 735 736 #define XFS_AGI_MAGICNUM (1 << 0) 737 #define XFS_AGI_VERSIONNUM (1 << 1) 738 #define XFS_AGI_SEQNO (1 << 2) 739 #define XFS_AGI_LENGTH (1 << 3) 740 #define XFS_AGI_COUNT (1 << 4) 741 #define XFS_AGI_ROOT (1 << 5) 742 #define XFS_AGI_LEVEL (1 << 6) 743 #define XFS_AGI_FREECOUNT (1 << 7) 744 #define XFS_AGI_NEWINO (1 << 8) 745 #define XFS_AGI_DIRINO (1 << 9) 746 #define XFS_AGI_UNLINKED (1 << 10) 747 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 748 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 749 #define XFS_AGI_FREE_ROOT (1 << 11) 750 #define XFS_AGI_FREE_LEVEL (1 << 12) 751 #define XFS_AGI_NUM_BITS_R2 13 752 753 /* disk block (xfs_daddr_t) in the AG */ 754 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 755 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 756 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 757 758 /* 759 * The third a.g. block contains the a.g. freelist, an array 760 * of block pointers to blocks owned by the allocation btree code. 761 */ 762 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 763 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 764 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 765 766 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 767 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 768 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 769 (__be32 *)(bp)->b_addr) 770 771 /* 772 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 773 * slots in the beginning of the block for a proper header with the 774 * location information and CRC. 775 */ 776 #define XFS_AGFL_SIZE(mp) \ 777 (((mp)->m_sb.sb_sectsize - \ 778 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 779 sizeof(struct xfs_agfl) : 0)) / \ 780 sizeof(xfs_agblock_t)) 781 782 typedef struct xfs_agfl { 783 __be32 agfl_magicnum; 784 __be32 agfl_seqno; 785 uuid_t agfl_uuid; 786 __be64 agfl_lsn; 787 __be32 agfl_crc; 788 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 789 } __attribute__((packed)) xfs_agfl_t; 790 791 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 792 793 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 794 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 795 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 796 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 797 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 798 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 799 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 800 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 801 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 802 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 803 804 /* 805 * For checking for bad ranges of xfs_daddr_t's, covering multiple 806 * allocation groups or a single xfs_daddr_t that's a superblock copy. 807 */ 808 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 809 ((len) == 1 ? \ 810 ASSERT((d) == XFS_SB_DADDR || \ 811 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 812 ASSERT(xfs_daddr_to_agno(mp, d) == \ 813 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 814 815 typedef struct xfs_timestamp { 816 __be32 t_sec; /* timestamp seconds */ 817 __be32 t_nsec; /* timestamp nanoseconds */ 818 } xfs_timestamp_t; 819 820 /* 821 * On-disk inode structure. 822 * 823 * This is just the header or "dinode core", the inode is expanded to fill a 824 * variable size the leftover area split into a data and an attribute fork. 825 * The format of the data and attribute fork depends on the format of the 826 * inode as indicated by di_format and di_aformat. To access the data and 827 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 828 * below. 829 * 830 * There is a very similar struct icdinode in xfs_inode which matches the 831 * layout of the first 96 bytes of this structure, but is kept in native 832 * format instead of big endian. 833 * 834 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 835 * padding field for v3 inodes. 836 */ 837 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 838 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 839 typedef struct xfs_dinode { 840 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 841 __be16 di_mode; /* mode and type of file */ 842 __u8 di_version; /* inode version */ 843 __u8 di_format; /* format of di_c data */ 844 __be16 di_onlink; /* old number of links to file */ 845 __be32 di_uid; /* owner's user id */ 846 __be32 di_gid; /* owner's group id */ 847 __be32 di_nlink; /* number of links to file */ 848 __be16 di_projid_lo; /* lower part of owner's project id */ 849 __be16 di_projid_hi; /* higher part owner's project id */ 850 __u8 di_pad[6]; /* unused, zeroed space */ 851 __be16 di_flushiter; /* incremented on flush */ 852 xfs_timestamp_t di_atime; /* time last accessed */ 853 xfs_timestamp_t di_mtime; /* time last modified */ 854 xfs_timestamp_t di_ctime; /* time created/inode modified */ 855 __be64 di_size; /* number of bytes in file */ 856 __be64 di_nblocks; /* # of direct & btree blocks used */ 857 __be32 di_extsize; /* basic/minimum extent size for file */ 858 __be32 di_nextents; /* number of extents in data fork */ 859 __be16 di_anextents; /* number of extents in attribute fork*/ 860 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 861 __s8 di_aformat; /* format of attr fork's data */ 862 __be32 di_dmevmask; /* DMIG event mask */ 863 __be16 di_dmstate; /* DMIG state info */ 864 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 865 __be32 di_gen; /* generation number */ 866 867 /* di_next_unlinked is the only non-core field in the old dinode */ 868 __be32 di_next_unlinked;/* agi unlinked list ptr */ 869 870 /* start of the extended dinode, writable fields */ 871 __le32 di_crc; /* CRC of the inode */ 872 __be64 di_changecount; /* number of attribute changes */ 873 __be64 di_lsn; /* flush sequence */ 874 __be64 di_flags2; /* more random flags */ 875 __u8 di_pad2[16]; /* more padding for future expansion */ 876 877 /* fields only written to during inode creation */ 878 xfs_timestamp_t di_crtime; /* time created */ 879 __be64 di_ino; /* inode number */ 880 uuid_t di_uuid; /* UUID of the filesystem */ 881 882 /* structure must be padded to 64 bit alignment */ 883 } xfs_dinode_t; 884 885 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 886 887 #define DI_MAX_FLUSH 0xffff 888 889 /* 890 * Size of the core inode on disk. Version 1 and 2 inodes have 891 * the same size, but version 3 has grown a few additional fields. 892 */ 893 static inline uint xfs_dinode_size(int version) 894 { 895 if (version == 3) 896 return sizeof(struct xfs_dinode); 897 return offsetof(struct xfs_dinode, di_crc); 898 } 899 900 /* 901 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 902 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 903 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 904 */ 905 #define XFS_MAXLINK ((1U << 31) - 1U) 906 #define XFS_MAXLINK_1 65535U 907 908 /* 909 * Values for di_format 910 */ 911 typedef enum xfs_dinode_fmt { 912 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 913 XFS_DINODE_FMT_LOCAL, /* bulk data */ 914 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 915 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 916 XFS_DINODE_FMT_UUID /* uuid_t */ 917 } xfs_dinode_fmt_t; 918 919 /* 920 * Inode minimum and maximum sizes. 921 */ 922 #define XFS_DINODE_MIN_LOG 8 923 #define XFS_DINODE_MAX_LOG 11 924 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 925 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 926 927 /* 928 * Inode size for given fs. 929 */ 930 #define XFS_LITINO(mp, version) \ 931 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 932 933 /* 934 * Inode data & attribute fork sizes, per inode. 935 */ 936 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 937 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 938 939 #define XFS_DFORK_DSIZE(dip,mp) \ 940 (XFS_DFORK_Q(dip) ? \ 941 XFS_DFORK_BOFF(dip) : \ 942 XFS_LITINO(mp, (dip)->di_version)) 943 #define XFS_DFORK_ASIZE(dip,mp) \ 944 (XFS_DFORK_Q(dip) ? \ 945 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 946 0) 947 #define XFS_DFORK_SIZE(dip,mp,w) \ 948 ((w) == XFS_DATA_FORK ? \ 949 XFS_DFORK_DSIZE(dip, mp) : \ 950 XFS_DFORK_ASIZE(dip, mp)) 951 952 /* 953 * Return pointers to the data or attribute forks. 954 */ 955 #define XFS_DFORK_DPTR(dip) \ 956 ((char *)dip + xfs_dinode_size(dip->di_version)) 957 #define XFS_DFORK_APTR(dip) \ 958 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 959 #define XFS_DFORK_PTR(dip,w) \ 960 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 961 962 #define XFS_DFORK_FORMAT(dip,w) \ 963 ((w) == XFS_DATA_FORK ? \ 964 (dip)->di_format : \ 965 (dip)->di_aformat) 966 #define XFS_DFORK_NEXTENTS(dip,w) \ 967 ((w) == XFS_DATA_FORK ? \ 968 be32_to_cpu((dip)->di_nextents) : \ 969 be16_to_cpu((dip)->di_anextents)) 970 971 /* 972 * For block and character special files the 32bit dev_t is stored at the 973 * beginning of the data fork. 974 */ 975 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 976 { 977 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 978 } 979 980 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 981 { 982 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 983 } 984 985 /* 986 * Values for di_flags 987 */ 988 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 989 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 990 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 991 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 992 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 993 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 994 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 995 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 996 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 997 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 998 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 999 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1000 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1001 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1002 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1003 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1004 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1005 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1006 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1007 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1008 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1009 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1010 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1011 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1012 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1013 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1014 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1015 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1016 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1017 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1018 1019 #define XFS_DIFLAG_ANY \ 1020 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1021 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1022 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1023 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1024 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1025 1026 /* 1027 * Values for di_flags2 These start by being exposed to userspace in the upper 1028 * 16 bits of the XFS_XFLAG_s range. 1029 */ 1030 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1031 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1032 1033 #define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) 1034 1035 /* 1036 * Inode number format: 1037 * low inopblog bits - offset in block 1038 * next agblklog bits - block number in ag 1039 * next agno_log bits - ag number 1040 * high agno_log-agblklog-inopblog bits - 0 1041 */ 1042 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1043 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1044 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1045 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1046 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1047 #define XFS_INO_BITS(mp) \ 1048 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1049 #define XFS_INO_TO_AGNO(mp,i) \ 1050 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1051 #define XFS_INO_TO_AGINO(mp,i) \ 1052 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1053 #define XFS_INO_TO_AGBNO(mp,i) \ 1054 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1055 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1056 #define XFS_INO_TO_OFFSET(mp,i) \ 1057 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1058 #define XFS_INO_TO_FSB(mp,i) \ 1059 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1060 #define XFS_AGINO_TO_INO(mp,a,i) \ 1061 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1062 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1063 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1064 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1065 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1066 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1067 1068 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1069 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1070 1071 /* 1072 * RealTime Device format definitions 1073 */ 1074 1075 /* Min and max rt extent sizes, specified in bytes */ 1076 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1077 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1078 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1079 1080 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1081 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1082 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1083 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1084 1085 /* 1086 * RT Summary and bit manipulation macros. 1087 */ 1088 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1089 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1090 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1091 #define XFS_SUMPTR(mp,bp,so) \ 1092 ((xfs_suminfo_t *)((bp)->b_addr + \ 1093 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1094 1095 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1096 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1097 #define XFS_BITTOWORD(mp,bi) \ 1098 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1099 1100 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1101 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1102 1103 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1104 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1105 1106 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1107 1108 /* 1109 * Dquot and dquot block format definitions 1110 */ 1111 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1112 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1113 1114 /* 1115 * This is the main portion of the on-disk representation of quota 1116 * information for a user. This is the q_core of the xfs_dquot_t that 1117 * is kept in kernel memory. We pad this with some more expansion room 1118 * to construct the on disk structure. 1119 */ 1120 typedef struct xfs_disk_dquot { 1121 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1122 __u8 d_version; /* dquot version */ 1123 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1124 __be32 d_id; /* user,project,group id */ 1125 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1126 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1127 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1128 __be64 d_ino_softlimit;/* preferred inode limit */ 1129 __be64 d_bcount; /* disk blocks owned by the user */ 1130 __be64 d_icount; /* inodes owned by the user */ 1131 __be32 d_itimer; /* zero if within inode limits if not, 1132 this is when we refuse service */ 1133 __be32 d_btimer; /* similar to above; for disk blocks */ 1134 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1135 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1136 __be32 d_pad0; /* 64 bit align */ 1137 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1138 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1139 __be64 d_rtbcount; /* realtime blocks owned */ 1140 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1141 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1142 __be16 d_pad; 1143 } xfs_disk_dquot_t; 1144 1145 /* 1146 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1147 * carrying the unnecessary padding would be a waste of memory. 1148 */ 1149 typedef struct xfs_dqblk { 1150 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1151 char dd_fill[4]; /* filling for posterity */ 1152 1153 /* 1154 * These two are only present on filesystems with the CRC bits set. 1155 */ 1156 __be32 dd_crc; /* checksum */ 1157 __be64 dd_lsn; /* last modification in log */ 1158 uuid_t dd_uuid; /* location information */ 1159 } xfs_dqblk_t; 1160 1161 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1162 1163 /* 1164 * Remote symlink format and access functions. 1165 */ 1166 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1167 1168 struct xfs_dsymlink_hdr { 1169 __be32 sl_magic; 1170 __be32 sl_offset; 1171 __be32 sl_bytes; 1172 __be32 sl_crc; 1173 uuid_t sl_uuid; 1174 __be64 sl_owner; 1175 __be64 sl_blkno; 1176 __be64 sl_lsn; 1177 }; 1178 1179 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1180 1181 /* 1182 * The maximum pathlen is 1024 bytes. Since the minimum file system 1183 * blocksize is 512 bytes, we can get a max of 3 extents back from 1184 * bmapi when crc headers are taken into account. 1185 */ 1186 #define XFS_SYMLINK_MAPS 3 1187 1188 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1189 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1190 sizeof(struct xfs_dsymlink_hdr) : 0)) 1191 1192 1193 /* 1194 * Allocation Btree format definitions 1195 * 1196 * There are two on-disk btrees, one sorted by blockno and one sorted 1197 * by blockcount and blockno. All blocks look the same to make the code 1198 * simpler; if we have time later, we'll make the optimizations. 1199 */ 1200 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1201 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1202 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1203 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1204 1205 /* 1206 * Data record/key structure 1207 */ 1208 typedef struct xfs_alloc_rec { 1209 __be32 ar_startblock; /* starting block number */ 1210 __be32 ar_blockcount; /* count of free blocks */ 1211 } xfs_alloc_rec_t, xfs_alloc_key_t; 1212 1213 typedef struct xfs_alloc_rec_incore { 1214 xfs_agblock_t ar_startblock; /* starting block number */ 1215 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1216 } xfs_alloc_rec_incore_t; 1217 1218 /* btree pointer type */ 1219 typedef __be32 xfs_alloc_ptr_t; 1220 1221 /* 1222 * Block numbers in the AG: 1223 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1224 */ 1225 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1226 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1227 1228 1229 /* 1230 * Inode Allocation Btree format definitions 1231 * 1232 * There is a btree for the inode map per allocation group. 1233 */ 1234 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1235 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1236 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1237 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1238 1239 typedef __uint64_t xfs_inofree_t; 1240 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1241 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1242 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1243 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1244 1245 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1246 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1247 #define XFS_INODES_PER_HOLEMASK_BIT \ 1248 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1249 1250 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1251 { 1252 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1253 } 1254 1255 /* 1256 * The on-disk inode record structure has two formats. The original "full" 1257 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1258 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1259 * count. 1260 * 1261 * The holemask of the sparse record format allows an inode chunk to have holes 1262 * that refer to blocks not owned by the inode record. This facilitates inode 1263 * allocation in the event of severe free space fragmentation. 1264 */ 1265 typedef struct xfs_inobt_rec { 1266 __be32 ir_startino; /* starting inode number */ 1267 union { 1268 struct { 1269 __be32 ir_freecount; /* count of free inodes */ 1270 } f; 1271 struct { 1272 __be16 ir_holemask;/* hole mask for sparse chunks */ 1273 __u8 ir_count; /* total inode count */ 1274 __u8 ir_freecount; /* count of free inodes */ 1275 } sp; 1276 } ir_u; 1277 __be64 ir_free; /* free inode mask */ 1278 } xfs_inobt_rec_t; 1279 1280 typedef struct xfs_inobt_rec_incore { 1281 xfs_agino_t ir_startino; /* starting inode number */ 1282 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1283 __uint8_t ir_count; /* total inode count */ 1284 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1285 xfs_inofree_t ir_free; /* free inode mask */ 1286 } xfs_inobt_rec_incore_t; 1287 1288 static inline bool xfs_inobt_issparse(uint16_t holemask) 1289 { 1290 /* non-zero holemask represents a sparse rec. */ 1291 return holemask; 1292 } 1293 1294 /* 1295 * Key structure 1296 */ 1297 typedef struct xfs_inobt_key { 1298 __be32 ir_startino; /* starting inode number */ 1299 } xfs_inobt_key_t; 1300 1301 /* btree pointer type */ 1302 typedef __be32 xfs_inobt_ptr_t; 1303 1304 /* 1305 * block numbers in the AG. 1306 */ 1307 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1308 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1309 1310 /* 1311 * The first data block of an AG depends on whether the filesystem was formatted 1312 * with the finobt feature. If so, account for the finobt reserved root btree 1313 * block. 1314 */ 1315 #define XFS_PREALLOC_BLOCKS(mp) \ 1316 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1317 XFS_FIBT_BLOCK(mp) + 1 : \ 1318 XFS_IBT_BLOCK(mp) + 1) 1319 1320 1321 1322 /* 1323 * BMAP Btree format definitions 1324 * 1325 * This includes both the root block definition that sits inside an inode fork 1326 * and the record/pointer formats for the leaf/node in the blocks. 1327 */ 1328 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1329 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1330 1331 /* 1332 * Bmap root header, on-disk form only. 1333 */ 1334 typedef struct xfs_bmdr_block { 1335 __be16 bb_level; /* 0 is a leaf */ 1336 __be16 bb_numrecs; /* current # of data records */ 1337 } xfs_bmdr_block_t; 1338 1339 /* 1340 * Bmap btree record and extent descriptor. 1341 * l0:63 is an extent flag (value 1 indicates non-normal). 1342 * l0:9-62 are startoff. 1343 * l0:0-8 and l1:21-63 are startblock. 1344 * l1:0-20 are blockcount. 1345 */ 1346 #define BMBT_EXNTFLAG_BITLEN 1 1347 #define BMBT_STARTOFF_BITLEN 54 1348 #define BMBT_STARTBLOCK_BITLEN 52 1349 #define BMBT_BLOCKCOUNT_BITLEN 21 1350 1351 typedef struct xfs_bmbt_rec { 1352 __be64 l0, l1; 1353 } xfs_bmbt_rec_t; 1354 1355 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1356 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1357 1358 typedef struct xfs_bmbt_rec_host { 1359 __uint64_t l0, l1; 1360 } xfs_bmbt_rec_host_t; 1361 1362 /* 1363 * Values and macros for delayed-allocation startblock fields. 1364 */ 1365 #define STARTBLOCKVALBITS 17 1366 #define STARTBLOCKMASKBITS (15 + 20) 1367 #define STARTBLOCKMASK \ 1368 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1369 1370 static inline int isnullstartblock(xfs_fsblock_t x) 1371 { 1372 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1373 } 1374 1375 static inline xfs_fsblock_t nullstartblock(int k) 1376 { 1377 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1378 return STARTBLOCKMASK | (k); 1379 } 1380 1381 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1382 { 1383 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1384 } 1385 1386 /* 1387 * Possible extent formats. 1388 */ 1389 typedef enum { 1390 XFS_EXTFMT_NOSTATE = 0, 1391 XFS_EXTFMT_HASSTATE 1392 } xfs_exntfmt_t; 1393 1394 /* 1395 * Possible extent states. 1396 */ 1397 typedef enum { 1398 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1399 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1400 } xfs_exntst_t; 1401 1402 /* 1403 * Incore version of above. 1404 */ 1405 typedef struct xfs_bmbt_irec 1406 { 1407 xfs_fileoff_t br_startoff; /* starting file offset */ 1408 xfs_fsblock_t br_startblock; /* starting block number */ 1409 xfs_filblks_t br_blockcount; /* number of blocks */ 1410 xfs_exntst_t br_state; /* extent state */ 1411 } xfs_bmbt_irec_t; 1412 1413 /* 1414 * Key structure for non-leaf levels of the tree. 1415 */ 1416 typedef struct xfs_bmbt_key { 1417 __be64 br_startoff; /* starting file offset */ 1418 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1419 1420 /* btree pointer type */ 1421 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1422 1423 1424 /* 1425 * Generic Btree block format definitions 1426 * 1427 * This is a combination of the actual format used on disk for short and long 1428 * format btrees. The first three fields are shared by both format, but the 1429 * pointers are different and should be used with care. 1430 * 1431 * To get the size of the actual short or long form headers please use the size 1432 * macros below. Never use sizeof(xfs_btree_block). 1433 * 1434 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1435 * with the crc feature bit, and all accesses to them must be conditional on 1436 * that flag. 1437 */ 1438 struct xfs_btree_block { 1439 __be32 bb_magic; /* magic number for block type */ 1440 __be16 bb_level; /* 0 is a leaf */ 1441 __be16 bb_numrecs; /* current # of data records */ 1442 union { 1443 struct { 1444 __be32 bb_leftsib; 1445 __be32 bb_rightsib; 1446 1447 __be64 bb_blkno; 1448 __be64 bb_lsn; 1449 uuid_t bb_uuid; 1450 __be32 bb_owner; 1451 __le32 bb_crc; 1452 } s; /* short form pointers */ 1453 struct { 1454 __be64 bb_leftsib; 1455 __be64 bb_rightsib; 1456 1457 __be64 bb_blkno; 1458 __be64 bb_lsn; 1459 uuid_t bb_uuid; 1460 __be64 bb_owner; 1461 __le32 bb_crc; 1462 __be32 bb_pad; /* padding for alignment */ 1463 } l; /* long form pointers */ 1464 } bb_u; /* rest */ 1465 }; 1466 1467 #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ 1468 #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ 1469 1470 /* sizes of CRC enabled btree blocks */ 1471 #define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) 1472 #define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) 1473 1474 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1475 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1476 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1477 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1478 1479 /* 1480 * On-disk XFS access control list structure. 1481 */ 1482 struct xfs_acl_entry { 1483 __be32 ae_tag; 1484 __be32 ae_id; 1485 __be16 ae_perm; 1486 __be16 ae_pad; /* fill the implicit hole in the structure */ 1487 }; 1488 1489 struct xfs_acl { 1490 __be32 acl_cnt; 1491 struct xfs_acl_entry acl_entry[0]; 1492 }; 1493 1494 /* 1495 * The number of ACL entries allowed is defined by the on-disk format. 1496 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1497 * limited only by the maximum size of the xattr that stores the information. 1498 */ 1499 #define XFS_ACL_MAX_ENTRIES(mp) \ 1500 (xfs_sb_version_hascrc(&mp->m_sb) \ 1501 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1502 sizeof(struct xfs_acl_entry) \ 1503 : 25) 1504 1505 #define XFS_ACL_SIZE(cnt) \ 1506 (sizeof(struct xfs_acl) + \ 1507 sizeof(struct xfs_acl_entry) * cnt) 1508 1509 #define XFS_ACL_MAX_SIZE(mp) \ 1510 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1511 1512 1513 /* On-disk XFS extended attribute names */ 1514 #define SGI_ACL_FILE "SGI_ACL_FILE" 1515 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1516 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1517 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1518 1519 #endif /* __XFS_FORMAT_H__ */ 1520