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 30struct xfs_mount; 31struct xfs_trans; 32struct xfs_inode; 33struct xfs_buf; 34struct 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 */ 105typedef 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 */ 196typedef 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 */ 295static 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 309static 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 */ 322static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 323{ 324 return sbp->sb_bad_features2 != sbp->sb_features2; 325} 326 327static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 328{ 329 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 330} 331 332static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 333{ 334 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 335} 336 337static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 338{ 339 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 340} 341 342static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 343{ 344 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 345} 346 347static 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 353static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 354{ 355 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 356} 357 358static 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 364static 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 370static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 371{ 372 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 373} 374 375static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 376{ 377 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 378} 379 380static 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 */ 389static 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 396static 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 403static 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 409static 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 416static 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 423static 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 449static inline bool 450xfs_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 461static inline bool 462xfs_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 478static inline bool 479xfs_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 488static inline bool 489xfs_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 */ 499static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 500{ 501 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 502} 503 504static 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 509static 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 517static 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 523static 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 */ 535static 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 545static inline bool 546xfs_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 612typedef 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 695typedef 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 782typedef 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 815typedef 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) 839typedef 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 */ 893static 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 */ 911typedef 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 */ 975static 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 980static 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 * There should be a one-to-one correspondence between these flags and the 988 * XFS_XFLAG_s. 989 */ 990#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 991#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 992#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 993#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 994#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 995#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 996#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 997#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 998#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 999#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1000#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1001#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1002#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1003#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1004#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1005#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1006#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1007#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1008#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1009#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1010#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1011#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1012#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1013#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1014#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1015#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1016#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1017#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1018#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1019#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1020 1021#define XFS_DIFLAG_ANY \ 1022 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1023 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1024 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1025 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1026 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1027 1028/* 1029 * Inode number format: 1030 * low inopblog bits - offset in block 1031 * next agblklog bits - block number in ag 1032 * next agno_log bits - ag number 1033 * high agno_log-agblklog-inopblog bits - 0 1034 */ 1035#define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1036#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1037#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1038#define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1039#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1040#define XFS_INO_BITS(mp) \ 1041 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1042#define XFS_INO_TO_AGNO(mp,i) \ 1043 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1044#define XFS_INO_TO_AGINO(mp,i) \ 1045 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1046#define XFS_INO_TO_AGBNO(mp,i) \ 1047 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1048 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1049#define XFS_INO_TO_OFFSET(mp,i) \ 1050 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1051#define XFS_INO_TO_FSB(mp,i) \ 1052 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1053#define XFS_AGINO_TO_INO(mp,a,i) \ 1054 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1055#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1056#define XFS_AGINO_TO_OFFSET(mp,i) \ 1057 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1058#define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1059 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1060 1061#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1062#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1063 1064/* 1065 * RealTime Device format definitions 1066 */ 1067 1068/* Min and max rt extent sizes, specified in bytes */ 1069#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1070#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1071#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1072 1073#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1074#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1075#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1076#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1077 1078/* 1079 * RT Summary and bit manipulation macros. 1080 */ 1081#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1082#define XFS_SUMOFFSTOBLOCK(mp,s) \ 1083 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1084#define XFS_SUMPTR(mp,bp,so) \ 1085 ((xfs_suminfo_t *)((bp)->b_addr + \ 1086 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1087 1088#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1089#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1090#define XFS_BITTOWORD(mp,bi) \ 1091 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1092 1093#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1094#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1095 1096#define XFS_RTLOBIT(w) xfs_lowbit32(w) 1097#define XFS_RTHIBIT(w) xfs_highbit32(w) 1098 1099#define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1100 1101/* 1102 * Dquot and dquot block format definitions 1103 */ 1104#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1105#define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1106 1107/* 1108 * This is the main portion of the on-disk representation of quota 1109 * information for a user. This is the q_core of the xfs_dquot_t that 1110 * is kept in kernel memory. We pad this with some more expansion room 1111 * to construct the on disk structure. 1112 */ 1113typedef struct xfs_disk_dquot { 1114 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1115 __u8 d_version; /* dquot version */ 1116 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1117 __be32 d_id; /* user,project,group id */ 1118 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1119 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1120 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1121 __be64 d_ino_softlimit;/* preferred inode limit */ 1122 __be64 d_bcount; /* disk blocks owned by the user */ 1123 __be64 d_icount; /* inodes owned by the user */ 1124 __be32 d_itimer; /* zero if within inode limits if not, 1125 this is when we refuse service */ 1126 __be32 d_btimer; /* similar to above; for disk blocks */ 1127 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1128 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1129 __be32 d_pad0; /* 64 bit align */ 1130 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1131 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1132 __be64 d_rtbcount; /* realtime blocks owned */ 1133 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1134 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1135 __be16 d_pad; 1136} xfs_disk_dquot_t; 1137 1138/* 1139 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1140 * carrying the unnecessary padding would be a waste of memory. 1141 */ 1142typedef struct xfs_dqblk { 1143 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1144 char dd_fill[4]; /* filling for posterity */ 1145 1146 /* 1147 * These two are only present on filesystems with the CRC bits set. 1148 */ 1149 __be32 dd_crc; /* checksum */ 1150 __be64 dd_lsn; /* last modification in log */ 1151 uuid_t dd_uuid; /* location information */ 1152} xfs_dqblk_t; 1153 1154#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1155 1156/* 1157 * Remote symlink format and access functions. 1158 */ 1159#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1160 1161struct xfs_dsymlink_hdr { 1162 __be32 sl_magic; 1163 __be32 sl_offset; 1164 __be32 sl_bytes; 1165 __be32 sl_crc; 1166 uuid_t sl_uuid; 1167 __be64 sl_owner; 1168 __be64 sl_blkno; 1169 __be64 sl_lsn; 1170}; 1171 1172#define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1173 1174/* 1175 * The maximum pathlen is 1024 bytes. Since the minimum file system 1176 * blocksize is 512 bytes, we can get a max of 3 extents back from 1177 * bmapi when crc headers are taken into account. 1178 */ 1179#define XFS_SYMLINK_MAPS 3 1180 1181#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1182 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1183 sizeof(struct xfs_dsymlink_hdr) : 0)) 1184 1185 1186/* 1187 * Allocation Btree format definitions 1188 * 1189 * There are two on-disk btrees, one sorted by blockno and one sorted 1190 * by blockcount and blockno. All blocks look the same to make the code 1191 * simpler; if we have time later, we'll make the optimizations. 1192 */ 1193#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1194#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1195#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1196#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1197 1198/* 1199 * Data record/key structure 1200 */ 1201typedef struct xfs_alloc_rec { 1202 __be32 ar_startblock; /* starting block number */ 1203 __be32 ar_blockcount; /* count of free blocks */ 1204} xfs_alloc_rec_t, xfs_alloc_key_t; 1205 1206typedef struct xfs_alloc_rec_incore { 1207 xfs_agblock_t ar_startblock; /* starting block number */ 1208 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1209} xfs_alloc_rec_incore_t; 1210 1211/* btree pointer type */ 1212typedef __be32 xfs_alloc_ptr_t; 1213 1214/* 1215 * Block numbers in the AG: 1216 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1217 */ 1218#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1219#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1220 1221 1222/* 1223 * Inode Allocation Btree format definitions 1224 * 1225 * There is a btree for the inode map per allocation group. 1226 */ 1227#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1228#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1229#define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1230#define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1231 1232typedef __uint64_t xfs_inofree_t; 1233#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1234#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1235#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1236#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1237 1238#define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1239#define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1240#define XFS_INODES_PER_HOLEMASK_BIT \ 1241 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1242 1243static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1244{ 1245 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1246} 1247 1248/* 1249 * The on-disk inode record structure has two formats. The original "full" 1250 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1251 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1252 * count. 1253 * 1254 * The holemask of the sparse record format allows an inode chunk to have holes 1255 * that refer to blocks not owned by the inode record. This facilitates inode 1256 * allocation in the event of severe free space fragmentation. 1257 */ 1258typedef struct xfs_inobt_rec { 1259 __be32 ir_startino; /* starting inode number */ 1260 union { 1261 struct { 1262 __be32 ir_freecount; /* count of free inodes */ 1263 } f; 1264 struct { 1265 __be16 ir_holemask;/* hole mask for sparse chunks */ 1266 __u8 ir_count; /* total inode count */ 1267 __u8 ir_freecount; /* count of free inodes */ 1268 } sp; 1269 } ir_u; 1270 __be64 ir_free; /* free inode mask */ 1271} xfs_inobt_rec_t; 1272 1273typedef struct xfs_inobt_rec_incore { 1274 xfs_agino_t ir_startino; /* starting inode number */ 1275 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1276 __uint8_t ir_count; /* total inode count */ 1277 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1278 xfs_inofree_t ir_free; /* free inode mask */ 1279} xfs_inobt_rec_incore_t; 1280 1281static inline bool xfs_inobt_issparse(uint16_t holemask) 1282{ 1283 /* non-zero holemask represents a sparse rec. */ 1284 return holemask; 1285} 1286 1287/* 1288 * Key structure 1289 */ 1290typedef struct xfs_inobt_key { 1291 __be32 ir_startino; /* starting inode number */ 1292} xfs_inobt_key_t; 1293 1294/* btree pointer type */ 1295typedef __be32 xfs_inobt_ptr_t; 1296 1297/* 1298 * block numbers in the AG. 1299 */ 1300#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1301#define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1302 1303/* 1304 * The first data block of an AG depends on whether the filesystem was formatted 1305 * with the finobt feature. If so, account for the finobt reserved root btree 1306 * block. 1307 */ 1308#define XFS_PREALLOC_BLOCKS(mp) \ 1309 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1310 XFS_FIBT_BLOCK(mp) + 1 : \ 1311 XFS_IBT_BLOCK(mp) + 1) 1312 1313 1314 1315/* 1316 * BMAP Btree format definitions 1317 * 1318 * This includes both the root block definition that sits inside an inode fork 1319 * and the record/pointer formats for the leaf/node in the blocks. 1320 */ 1321#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1322#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1323 1324/* 1325 * Bmap root header, on-disk form only. 1326 */ 1327typedef struct xfs_bmdr_block { 1328 __be16 bb_level; /* 0 is a leaf */ 1329 __be16 bb_numrecs; /* current # of data records */ 1330} xfs_bmdr_block_t; 1331 1332/* 1333 * Bmap btree record and extent descriptor. 1334 * l0:63 is an extent flag (value 1 indicates non-normal). 1335 * l0:9-62 are startoff. 1336 * l0:0-8 and l1:21-63 are startblock. 1337 * l1:0-20 are blockcount. 1338 */ 1339#define BMBT_EXNTFLAG_BITLEN 1 1340#define BMBT_STARTOFF_BITLEN 54 1341#define BMBT_STARTBLOCK_BITLEN 52 1342#define BMBT_BLOCKCOUNT_BITLEN 21 1343 1344typedef struct xfs_bmbt_rec { 1345 __be64 l0, l1; 1346} xfs_bmbt_rec_t; 1347 1348typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1349typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1350 1351typedef struct xfs_bmbt_rec_host { 1352 __uint64_t l0, l1; 1353} xfs_bmbt_rec_host_t; 1354 1355/* 1356 * Values and macros for delayed-allocation startblock fields. 1357 */ 1358#define STARTBLOCKVALBITS 17 1359#define STARTBLOCKMASKBITS (15 + 20) 1360#define STARTBLOCKMASK \ 1361 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1362 1363static inline int isnullstartblock(xfs_fsblock_t x) 1364{ 1365 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1366} 1367 1368static inline xfs_fsblock_t nullstartblock(int k) 1369{ 1370 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1371 return STARTBLOCKMASK | (k); 1372} 1373 1374static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1375{ 1376 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1377} 1378 1379/* 1380 * Possible extent formats. 1381 */ 1382typedef enum { 1383 XFS_EXTFMT_NOSTATE = 0, 1384 XFS_EXTFMT_HASSTATE 1385} xfs_exntfmt_t; 1386 1387/* 1388 * Possible extent states. 1389 */ 1390typedef enum { 1391 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1392 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1393} xfs_exntst_t; 1394 1395/* 1396 * Incore version of above. 1397 */ 1398typedef struct xfs_bmbt_irec 1399{ 1400 xfs_fileoff_t br_startoff; /* starting file offset */ 1401 xfs_fsblock_t br_startblock; /* starting block number */ 1402 xfs_filblks_t br_blockcount; /* number of blocks */ 1403 xfs_exntst_t br_state; /* extent state */ 1404} xfs_bmbt_irec_t; 1405 1406/* 1407 * Key structure for non-leaf levels of the tree. 1408 */ 1409typedef struct xfs_bmbt_key { 1410 __be64 br_startoff; /* starting file offset */ 1411} xfs_bmbt_key_t, xfs_bmdr_key_t; 1412 1413/* btree pointer type */ 1414typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1415 1416 1417/* 1418 * Generic Btree block format definitions 1419 * 1420 * This is a combination of the actual format used on disk for short and long 1421 * format btrees. The first three fields are shared by both format, but the 1422 * pointers are different and should be used with care. 1423 * 1424 * To get the size of the actual short or long form headers please use the size 1425 * macros below. Never use sizeof(xfs_btree_block). 1426 * 1427 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1428 * with the crc feature bit, and all accesses to them must be conditional on 1429 * that flag. 1430 */ 1431struct xfs_btree_block { 1432 __be32 bb_magic; /* magic number for block type */ 1433 __be16 bb_level; /* 0 is a leaf */ 1434 __be16 bb_numrecs; /* current # of data records */ 1435 union { 1436 struct { 1437 __be32 bb_leftsib; 1438 __be32 bb_rightsib; 1439 1440 __be64 bb_blkno; 1441 __be64 bb_lsn; 1442 uuid_t bb_uuid; 1443 __be32 bb_owner; 1444 __le32 bb_crc; 1445 } s; /* short form pointers */ 1446 struct { 1447 __be64 bb_leftsib; 1448 __be64 bb_rightsib; 1449 1450 __be64 bb_blkno; 1451 __be64 bb_lsn; 1452 uuid_t bb_uuid; 1453 __be64 bb_owner; 1454 __le32 bb_crc; 1455 __be32 bb_pad; /* padding for alignment */ 1456 } l; /* long form pointers */ 1457 } bb_u; /* rest */ 1458}; 1459 1460#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ 1461#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ 1462 1463/* sizes of CRC enabled btree blocks */ 1464#define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) 1465#define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) 1466 1467#define XFS_BTREE_SBLOCK_CRC_OFF \ 1468 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1469#define XFS_BTREE_LBLOCK_CRC_OFF \ 1470 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1471 1472/* 1473 * On-disk XFS access control list structure. 1474 */ 1475struct xfs_acl_entry { 1476 __be32 ae_tag; 1477 __be32 ae_id; 1478 __be16 ae_perm; 1479 __be16 ae_pad; /* fill the implicit hole in the structure */ 1480}; 1481 1482struct xfs_acl { 1483 __be32 acl_cnt; 1484 struct xfs_acl_entry acl_entry[0]; 1485}; 1486 1487/* 1488 * The number of ACL entries allowed is defined by the on-disk format. 1489 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1490 * limited only by the maximum size of the xattr that stores the information. 1491 */ 1492#define XFS_ACL_MAX_ENTRIES(mp) \ 1493 (xfs_sb_version_hascrc(&mp->m_sb) \ 1494 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1495 sizeof(struct xfs_acl_entry) \ 1496 : 25) 1497 1498#define XFS_ACL_SIZE(cnt) \ 1499 (sizeof(struct xfs_acl) + \ 1500 sizeof(struct xfs_acl_entry) * cnt) 1501 1502#define XFS_ACL_MAX_SIZE(mp) \ 1503 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1504 1505 1506/* On-disk XFS extended attribute names */ 1507#define SGI_ACL_FILE "SGI_ACL_FILE" 1508#define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1509#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1510#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1511 1512#endif /* __XFS_FORMAT_H__ */ 1513