1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_FORMAT_H__ 7 #define __XFS_FORMAT_H__ 8 9 /* 10 * XFS On Disk Format Definitions 11 * 12 * This header file defines all the on-disk format definitions for 13 * general XFS objects. Directory and attribute related objects are defined in 14 * xfs_da_format.h, which log and log item formats are defined in 15 * xfs_log_format.h. Everything else goes here. 16 */ 17 18 struct xfs_mount; 19 struct xfs_trans; 20 struct xfs_inode; 21 struct xfs_buf; 22 struct xfs_ifork; 23 24 /* 25 * Super block 26 * Fits into a sector-sized buffer at address 0 of each allocation group. 27 * Only the first of these is ever updated except during growfs. 28 */ 29 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */ 30 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */ 31 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */ 32 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */ 33 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */ 34 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */ 35 #define XFS_SB_VERSION_NUMBITS 0x000f 36 #define XFS_SB_VERSION_ALLFBITS 0xfff0 37 #define XFS_SB_VERSION_ATTRBIT 0x0010 38 #define XFS_SB_VERSION_NLINKBIT 0x0020 39 #define XFS_SB_VERSION_QUOTABIT 0x0040 40 #define XFS_SB_VERSION_ALIGNBIT 0x0080 41 #define XFS_SB_VERSION_DALIGNBIT 0x0100 42 #define XFS_SB_VERSION_SHAREDBIT 0x0200 43 #define XFS_SB_VERSION_LOGV2BIT 0x0400 44 #define XFS_SB_VERSION_SECTORBIT 0x0800 45 #define XFS_SB_VERSION_EXTFLGBIT 0x1000 46 #define XFS_SB_VERSION_DIRV2BIT 0x2000 47 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */ 48 #define XFS_SB_VERSION_MOREBITSBIT 0x8000 49 50 /* 51 * The size of a single extended attribute on disk is limited by 52 * the size of index values within the attribute entries themselves. 53 * These are be16 fields, so we can only support attribute data 54 * sizes up to 2^16 bytes in length. 55 */ 56 #define XFS_XATTR_SIZE_MAX (1 << 16) 57 58 /* 59 * Supported feature bit list is just all bits in the versionnum field because 60 * we've used them all up and understand them all. Except, of course, for the 61 * shared superblock bit, which nobody knows what it does and so is unsupported. 62 */ 63 #define XFS_SB_VERSION_OKBITS \ 64 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ 65 ~XFS_SB_VERSION_SHAREDBIT) 66 67 /* 68 * There are two words to hold XFS "feature" bits: the original 69 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 70 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 71 * 72 * These defines represent bits in sb_features2. 73 */ 74 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 75 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 76 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 77 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 78 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 79 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 80 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ 81 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ 82 83 #define XFS_SB_VERSION2_OKBITS \ 84 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 85 XFS_SB_VERSION2_ATTR2BIT | \ 86 XFS_SB_VERSION2_PROJID32BIT | \ 87 XFS_SB_VERSION2_FTYPE) 88 89 /* Maximum size of the xfs filesystem label, no terminating NULL */ 90 #define XFSLABEL_MAX 12 91 92 /* 93 * Superblock - in core version. Must be padded to 64 bit alignment. 94 */ 95 typedef struct xfs_sb { 96 uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 97 uint32_t sb_blocksize; /* logical block size, bytes */ 98 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 99 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 100 xfs_rtbxlen_t sb_rextents; /* number of realtime extents */ 101 uuid_t sb_uuid; /* user-visible file system unique id */ 102 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 103 xfs_ino_t sb_rootino; /* root inode number */ 104 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 105 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 106 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 107 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 108 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 109 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 110 xfs_extlen_t sb_logblocks; /* number of log blocks */ 111 uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 112 uint16_t sb_sectsize; /* volume sector size, bytes */ 113 uint16_t sb_inodesize; /* inode size, bytes */ 114 uint16_t sb_inopblock; /* inodes per block */ 115 char sb_fname[XFSLABEL_MAX]; /* file system name */ 116 uint8_t sb_blocklog; /* log2 of sb_blocksize */ 117 uint8_t sb_sectlog; /* log2 of sb_sectsize */ 118 uint8_t sb_inodelog; /* log2 of sb_inodesize */ 119 uint8_t sb_inopblog; /* log2 of sb_inopblock */ 120 uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 121 uint8_t sb_rextslog; /* log2 of sb_rextents */ 122 uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 123 uint8_t sb_imax_pct; /* max % of fs for inode space */ 124 /* statistics */ 125 /* 126 * These fields must remain contiguous. If you really 127 * want to change their layout, make sure you fix the 128 * code in xfs_trans_apply_sb_deltas(). 129 */ 130 uint64_t sb_icount; /* allocated inodes */ 131 uint64_t sb_ifree; /* free inodes */ 132 uint64_t sb_fdblocks; /* free data blocks */ 133 uint64_t sb_frextents; /* free realtime extents */ 134 /* 135 * End contiguous fields. 136 */ 137 xfs_ino_t sb_uquotino; /* user quota inode */ 138 xfs_ino_t sb_gquotino; /* group quota inode */ 139 uint16_t sb_qflags; /* quota flags */ 140 uint8_t sb_flags; /* misc. flags */ 141 uint8_t sb_shared_vn; /* shared version number */ 142 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 143 uint32_t sb_unit; /* stripe or raid unit */ 144 uint32_t sb_width; /* stripe or raid width */ 145 uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 146 uint8_t sb_logsectlog; /* log2 of the log sector size */ 147 uint16_t sb_logsectsize; /* sector size for the log, bytes */ 148 uint32_t sb_logsunit; /* stripe unit size for the log */ 149 uint32_t sb_features2; /* additional feature bits */ 150 151 /* 152 * bad features2 field as a result of failing to pad the sb structure to 153 * 64 bits. Some machines will be using this field for features2 bits. 154 * Easiest just to mark it bad and not use it for anything else. 155 * 156 * This is not kept up to date in memory; it is always overwritten by 157 * the value in sb_features2 when formatting the incore superblock to 158 * the disk buffer. 159 */ 160 uint32_t sb_bad_features2; 161 162 /* version 5 superblock fields start here */ 163 164 /* feature masks */ 165 uint32_t sb_features_compat; 166 uint32_t sb_features_ro_compat; 167 uint32_t sb_features_incompat; 168 uint32_t sb_features_log_incompat; 169 170 uint32_t sb_crc; /* superblock crc */ 171 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ 172 173 xfs_ino_t sb_pquotino; /* project quota inode */ 174 xfs_lsn_t sb_lsn; /* last write sequence */ 175 uuid_t sb_meta_uuid; /* metadata file system unique id */ 176 177 xfs_ino_t sb_metadirino; /* metadata directory tree root */ 178 179 xfs_rgnumber_t sb_rgcount; /* number of realtime groups */ 180 xfs_rtxlen_t sb_rgextents; /* size of a realtime group in rtx */ 181 182 uint8_t sb_rgblklog; /* rt group number shift */ 183 uint8_t sb_pad[7]; /* zeroes */ 184 185 /* must be padded to 64 bit alignment */ 186 } xfs_sb_t; 187 188 /* 189 * Superblock - on disk version. 190 * Must be padded to 64 bit alignment. 191 */ 192 struct xfs_dsb { 193 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 194 __be32 sb_blocksize; /* logical block size, bytes */ 195 __be64 sb_dblocks; /* number of data blocks */ 196 __be64 sb_rblocks; /* number of realtime blocks */ 197 __be64 sb_rextents; /* number of realtime extents */ 198 uuid_t sb_uuid; /* user-visible file system unique id */ 199 __be64 sb_logstart; /* starting block of log if internal */ 200 __be64 sb_rootino; /* root inode number */ 201 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 202 __be64 sb_rsumino; /* summary inode for rt bitmap */ 203 __be32 sb_rextsize; /* realtime extent size, blocks */ 204 __be32 sb_agblocks; /* size of an allocation group */ 205 __be32 sb_agcount; /* number of allocation groups */ 206 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 207 __be32 sb_logblocks; /* number of log blocks */ 208 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 209 __be16 sb_sectsize; /* volume sector size, bytes */ 210 __be16 sb_inodesize; /* inode size, bytes */ 211 __be16 sb_inopblock; /* inodes per block */ 212 char sb_fname[XFSLABEL_MAX]; /* file system name */ 213 __u8 sb_blocklog; /* log2 of sb_blocksize */ 214 __u8 sb_sectlog; /* log2 of sb_sectsize */ 215 __u8 sb_inodelog; /* log2 of sb_inodesize */ 216 __u8 sb_inopblog; /* log2 of sb_inopblock */ 217 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 218 __u8 sb_rextslog; /* log2 of sb_rextents */ 219 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 220 __u8 sb_imax_pct; /* max % of fs for inode space */ 221 /* statistics */ 222 /* 223 * These fields must remain contiguous. If you really 224 * want to change their layout, make sure you fix the 225 * code in xfs_trans_apply_sb_deltas(). 226 */ 227 __be64 sb_icount; /* allocated inodes */ 228 __be64 sb_ifree; /* free inodes */ 229 __be64 sb_fdblocks; /* free data blocks */ 230 __be64 sb_frextents; /* free realtime extents */ 231 /* 232 * End contiguous fields. 233 */ 234 __be64 sb_uquotino; /* user quota inode */ 235 __be64 sb_gquotino; /* group quota inode */ 236 __be16 sb_qflags; /* quota flags */ 237 __u8 sb_flags; /* misc. flags */ 238 __u8 sb_shared_vn; /* shared version number */ 239 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 240 __be32 sb_unit; /* stripe or raid unit */ 241 __be32 sb_width; /* stripe or raid width */ 242 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 243 __u8 sb_logsectlog; /* log2 of the log sector size */ 244 __be16 sb_logsectsize; /* sector size for the log, bytes */ 245 __be32 sb_logsunit; /* stripe unit size for the log */ 246 __be32 sb_features2; /* additional feature bits */ 247 /* 248 * bad features2 field as a result of failing to pad the sb 249 * structure to 64 bits. Some machines will be using this field 250 * for features2 bits. Easiest just to mark it bad and not use 251 * it for anything else. 252 */ 253 __be32 sb_bad_features2; 254 255 /* version 5 superblock fields start here */ 256 257 /* feature masks */ 258 __be32 sb_features_compat; 259 __be32 sb_features_ro_compat; 260 __be32 sb_features_incompat; 261 __be32 sb_features_log_incompat; 262 263 __le32 sb_crc; /* superblock crc */ 264 __be32 sb_spino_align; /* sparse inode chunk alignment */ 265 266 __be64 sb_pquotino; /* project quota inode */ 267 __be64 sb_lsn; /* last write sequence */ 268 uuid_t sb_meta_uuid; /* metadata file system unique id */ 269 270 __be64 sb_metadirino; /* metadata directory tree root */ 271 __be32 sb_rgcount; /* # of realtime groups */ 272 __be32 sb_rgextents; /* size of rtgroup in rtx */ 273 274 __u8 sb_rgblklog; /* rt group number shift */ 275 __u8 sb_pad[7]; /* zeroes */ 276 277 /* 278 * The size of this structure must be padded to 64 bit alignment. 279 * 280 * NOTE: Don't forget to update secondary_sb_whack in xfs_repair when 281 * adding new fields here. 282 */ 283 }; 284 285 #define XFS_SB_CRC_OFF offsetof(struct xfs_dsb, sb_crc) 286 287 /* 288 * Misc. Flags - warning - these will be cleared by xfs_repair unless 289 * a feature bit is set when the flag is used. 290 */ 291 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 292 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 293 294 /* 295 * define max. shared version we can interoperate with 296 */ 297 #define XFS_SB_MAX_SHARED_VN 0 298 299 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 300 301 static inline bool xfs_sb_is_v5(const struct xfs_sb *sbp) 302 { 303 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 304 } 305 306 /* 307 * Detect a mismatched features2 field. Older kernels read/wrote 308 * this into the wrong slot, so to be safe we keep them in sync. 309 */ 310 static inline bool xfs_sb_has_mismatched_features2(const struct xfs_sb *sbp) 311 { 312 return sbp->sb_bad_features2 != sbp->sb_features2; 313 } 314 315 static inline bool xfs_sb_version_hasmorebits(const struct xfs_sb *sbp) 316 { 317 return xfs_sb_is_v5(sbp) || 318 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 319 } 320 321 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 322 { 323 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 324 } 325 326 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 327 { 328 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 329 } 330 331 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 332 { 333 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 334 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 335 } 336 337 static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp) 338 { 339 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 340 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 341 } 342 343 /* 344 * Extended v5 superblock feature masks. These are to be used for new v5 345 * superblock features only. 346 * 347 * Compat features are new features that old kernels will not notice or affect 348 * and so can mount read-write without issues. 349 * 350 * RO-Compat (read only) are features that old kernels can read but will break 351 * if they write. Hence only read-only mounts of such filesystems are allowed on 352 * kernels that don't support the feature bit. 353 * 354 * InCompat features are features which old kernels will not understand and so 355 * must not mount. 356 * 357 * Log-InCompat features are for changes to log formats or new transactions that 358 * can't be replayed on older kernels. The fields are set when the filesystem is 359 * mounted, and a clean unmount clears the fields. 360 */ 361 #define XFS_SB_FEAT_COMPAT_ALL 0 362 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 363 static inline bool 364 xfs_sb_has_compat_feature( 365 const struct xfs_sb *sbp, 366 uint32_t feature) 367 { 368 return (sbp->sb_features_compat & feature) != 0; 369 } 370 371 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 372 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ 373 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ 374 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ 375 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 376 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 377 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 378 XFS_SB_FEAT_RO_COMPAT_REFLINK| \ 379 XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 380 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 381 static inline bool 382 xfs_sb_has_ro_compat_feature( 383 const struct xfs_sb *sbp, 384 uint32_t feature) 385 { 386 return (sbp->sb_features_ro_compat & feature) != 0; 387 } 388 389 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 390 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 391 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 392 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ 393 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */ 394 #define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */ 395 #define XFS_SB_FEAT_INCOMPAT_EXCHRANGE (1 << 6) /* exchangerange supported */ 396 #define XFS_SB_FEAT_INCOMPAT_PARENT (1 << 7) /* parent pointers */ 397 #define XFS_SB_FEAT_INCOMPAT_METADIR (1 << 8) /* metadata dir tree */ 398 #define XFS_SB_FEAT_INCOMPAT_ALL \ 399 (XFS_SB_FEAT_INCOMPAT_FTYPE | \ 400 XFS_SB_FEAT_INCOMPAT_SPINODES | \ 401 XFS_SB_FEAT_INCOMPAT_META_UUID | \ 402 XFS_SB_FEAT_INCOMPAT_BIGTIME | \ 403 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR | \ 404 XFS_SB_FEAT_INCOMPAT_NREXT64 | \ 405 XFS_SB_FEAT_INCOMPAT_EXCHRANGE | \ 406 XFS_SB_FEAT_INCOMPAT_PARENT | \ 407 XFS_SB_FEAT_INCOMPAT_METADIR) 408 409 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 410 static inline bool 411 xfs_sb_has_incompat_feature( 412 const struct xfs_sb *sbp, 413 uint32_t feature) 414 { 415 return (sbp->sb_features_incompat & feature) != 0; 416 } 417 418 #define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */ 419 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL \ 420 (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS) 421 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 422 static inline bool 423 xfs_sb_has_incompat_log_feature( 424 const struct xfs_sb *sbp, 425 uint32_t feature) 426 { 427 return (sbp->sb_features_log_incompat & feature) != 0; 428 } 429 430 static inline void 431 xfs_sb_remove_incompat_log_features( 432 struct xfs_sb *sbp) 433 { 434 sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL; 435 } 436 437 static inline void 438 xfs_sb_add_incompat_log_features( 439 struct xfs_sb *sbp, 440 unsigned int features) 441 { 442 sbp->sb_features_log_incompat |= features; 443 } 444 445 static inline bool xfs_sb_version_haslogxattrs(const struct xfs_sb *sbp) 446 { 447 return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat & 448 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS); 449 } 450 451 static inline bool 452 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 453 { 454 return (ino == sbp->sb_uquotino || 455 ino == sbp->sb_gquotino || 456 ino == sbp->sb_pquotino); 457 } 458 459 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 460 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 461 462 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 463 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 464 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 465 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 466 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 467 468 /* 469 * File system sector to basic block conversions. 470 */ 471 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 472 473 /* 474 * File system block to basic block conversions. 475 */ 476 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 477 #define XFS_BB_TO_FSB(mp,bb) \ 478 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 479 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 480 481 /* 482 * File system block to byte conversions. 483 */ 484 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 485 #define XFS_B_TO_FSB(mp,b) \ 486 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 487 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 488 489 /* 490 * Allocation group header 491 * 492 * This is divided into three structures, placed in sequential 512-byte 493 * buffers after a copy of the superblock (also in a 512-byte buffer). 494 */ 495 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 496 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 497 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 498 #define XFS_AGF_VERSION 1 499 #define XFS_AGI_VERSION 1 500 501 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 502 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 503 504 /* 505 * agf_cnt_level in the first AGF overlaps the EFS superblock's magic number. 506 * Since the magic numbers valid for EFS are > 64k, our value cannot be confused 507 * for an EFS superblock. 508 */ 509 510 typedef struct xfs_agf { 511 /* 512 * Common allocation group header information 513 */ 514 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 515 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 516 __be32 agf_seqno; /* sequence # starting from 0 */ 517 __be32 agf_length; /* size in blocks of a.g. */ 518 /* 519 * Freespace and rmap information 520 */ 521 __be32 agf_bno_root; /* bnobt root block */ 522 __be32 agf_cnt_root; /* cntbt root block */ 523 __be32 agf_rmap_root; /* rmapbt root block */ 524 525 __be32 agf_bno_level; /* bnobt btree levels */ 526 __be32 agf_cnt_level; /* cntbt btree levels */ 527 __be32 agf_rmap_level; /* rmapbt btree levels */ 528 529 __be32 agf_flfirst; /* first freelist block's index */ 530 __be32 agf_fllast; /* last freelist block's index */ 531 __be32 agf_flcount; /* count of blocks in freelist */ 532 __be32 agf_freeblks; /* total free blocks */ 533 534 __be32 agf_longest; /* longest free space */ 535 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 536 uuid_t agf_uuid; /* uuid of filesystem */ 537 538 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 539 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 540 541 __be32 agf_refcount_root; /* refcount tree root block */ 542 __be32 agf_refcount_level; /* refcount btree levels */ 543 544 /* 545 * reserve some contiguous space for future logged fields before we add 546 * the unlogged fields. This makes the range logging via flags and 547 * structure offsets much simpler. 548 */ 549 __be64 agf_spare64[14]; 550 551 /* unlogged fields, written during buffer writeback. */ 552 __be64 agf_lsn; /* last write sequence */ 553 __be32 agf_crc; /* crc of agf sector */ 554 __be32 agf_spare2; 555 556 /* structure must be padded to 64 bit alignment */ 557 } xfs_agf_t; 558 559 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 560 561 #define XFS_AGF_MAGICNUM (1u << 0) 562 #define XFS_AGF_VERSIONNUM (1u << 1) 563 #define XFS_AGF_SEQNO (1u << 2) 564 #define XFS_AGF_LENGTH (1u << 3) 565 #define XFS_AGF_ROOTS (1u << 4) 566 #define XFS_AGF_LEVELS (1u << 5) 567 #define XFS_AGF_FLFIRST (1u << 6) 568 #define XFS_AGF_FLLAST (1u << 7) 569 #define XFS_AGF_FLCOUNT (1u << 8) 570 #define XFS_AGF_FREEBLKS (1u << 9) 571 #define XFS_AGF_LONGEST (1u << 10) 572 #define XFS_AGF_BTREEBLKS (1u << 11) 573 #define XFS_AGF_UUID (1u << 12) 574 #define XFS_AGF_RMAP_BLOCKS (1u << 13) 575 #define XFS_AGF_REFCOUNT_BLOCKS (1u << 14) 576 #define XFS_AGF_REFCOUNT_ROOT (1u << 15) 577 #define XFS_AGF_REFCOUNT_LEVEL (1u << 16) 578 #define XFS_AGF_SPARE64 (1u << 17) 579 #define XFS_AGF_NUM_BITS 18 580 #define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1) 581 582 #define XFS_AGF_FLAGS \ 583 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 584 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 585 { XFS_AGF_SEQNO, "SEQNO" }, \ 586 { XFS_AGF_LENGTH, "LENGTH" }, \ 587 { XFS_AGF_ROOTS, "ROOTS" }, \ 588 { XFS_AGF_LEVELS, "LEVELS" }, \ 589 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 590 { XFS_AGF_FLLAST, "FLLAST" }, \ 591 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 592 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 593 { XFS_AGF_LONGEST, "LONGEST" }, \ 594 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 595 { XFS_AGF_UUID, "UUID" }, \ 596 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 597 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 598 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 599 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 600 { XFS_AGF_SPARE64, "SPARE64" } 601 602 /* disk block (xfs_daddr_t) in the AG */ 603 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 604 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 605 606 /* 607 * Size of the unlinked inode hash table in the agi. 608 */ 609 #define XFS_AGI_UNLINKED_BUCKETS 64 610 611 typedef struct xfs_agi { 612 /* 613 * Common allocation group header information 614 */ 615 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 616 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 617 __be32 agi_seqno; /* sequence # starting from 0 */ 618 __be32 agi_length; /* size in blocks of a.g. */ 619 /* 620 * Inode information 621 * Inodes are mapped by interpreting the inode number, so no 622 * mapping data is needed here. 623 */ 624 __be32 agi_count; /* count of allocated inodes */ 625 __be32 agi_root; /* root of inode btree */ 626 __be32 agi_level; /* levels in inode btree */ 627 __be32 agi_freecount; /* number of free inodes */ 628 629 __be32 agi_newino; /* new inode just allocated */ 630 __be32 agi_dirino; /* last directory inode chunk */ 631 /* 632 * Hash table of inodes which have been unlinked but are 633 * still being referenced. 634 */ 635 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 636 /* 637 * This marks the end of logging region 1 and start of logging region 2. 638 */ 639 uuid_t agi_uuid; /* uuid of filesystem */ 640 __be32 agi_crc; /* crc of agi sector */ 641 __be32 agi_pad32; 642 __be64 agi_lsn; /* last write sequence */ 643 644 __be32 agi_free_root; /* root of the free inode btree */ 645 __be32 agi_free_level;/* levels in free inode btree */ 646 647 __be32 agi_iblocks; /* inobt blocks used */ 648 __be32 agi_fblocks; /* finobt blocks used */ 649 650 /* structure must be padded to 64 bit alignment */ 651 } xfs_agi_t; 652 653 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 654 655 #define XFS_AGI_MAGICNUM (1u << 0) 656 #define XFS_AGI_VERSIONNUM (1u << 1) 657 #define XFS_AGI_SEQNO (1u << 2) 658 #define XFS_AGI_LENGTH (1u << 3) 659 #define XFS_AGI_COUNT (1u << 4) 660 #define XFS_AGI_ROOT (1u << 5) 661 #define XFS_AGI_LEVEL (1u << 6) 662 #define XFS_AGI_FREECOUNT (1u << 7) 663 #define XFS_AGI_NEWINO (1u << 8) 664 #define XFS_AGI_DIRINO (1u << 9) 665 #define XFS_AGI_UNLINKED (1u << 10) 666 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 667 #define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1) 668 #define XFS_AGI_FREE_ROOT (1u << 11) 669 #define XFS_AGI_FREE_LEVEL (1u << 12) 670 #define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */ 671 #define XFS_AGI_NUM_BITS_R2 14 672 673 /* disk block (xfs_daddr_t) in the AG */ 674 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 675 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 676 677 /* 678 * The third a.g. block contains the a.g. freelist, an array 679 * of block pointers to blocks owned by the allocation btree code. 680 */ 681 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 682 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 683 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr)) 684 685 struct xfs_agfl { 686 __be32 agfl_magicnum; 687 __be32 agfl_seqno; 688 uuid_t agfl_uuid; 689 __be64 agfl_lsn; 690 __be32 agfl_crc; 691 } __attribute__((packed)); 692 693 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 694 695 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 696 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 697 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 698 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 699 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 700 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 701 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 702 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 703 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 704 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 705 706 /* 707 * For checking for bad ranges of xfs_daddr_t's, covering multiple 708 * allocation groups or a single xfs_daddr_t that's a superblock copy. 709 */ 710 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 711 ((len) == 1 ? \ 712 ASSERT((d) == XFS_SB_DADDR || \ 713 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 714 ASSERT(xfs_daddr_to_agno(mp, d) == \ 715 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 716 717 /* 718 * Realtime bitmap information is accessed by the word, which is currently 719 * stored in host-endian format. Starting with the realtime groups feature, 720 * the words are stored in be32 ondisk. 721 */ 722 union xfs_rtword_raw { 723 __u32 old; 724 __be32 rtg; 725 }; 726 727 /* 728 * Realtime summary counts are accessed by the word, which is currently 729 * stored in host-endian format. Starting with the realtime groups feature, 730 * the words are stored in be32 ondisk. 731 */ 732 union xfs_suminfo_raw { 733 __u32 old; 734 __be32 rtg; 735 }; 736 737 /* 738 * Realtime allocation groups break the rt section into multiple pieces that 739 * could be locked independently. Realtime block group numbers are 32-bit 740 * quantities. Block numbers within a group are also 32-bit quantities, but 741 * the upper bit must never be set. rtgroup 0 might have a superblock in it, 742 * so the minimum size of an rtgroup is 2 rtx. 743 */ 744 #define XFS_MAX_RGBLOCKS ((xfs_rgblock_t)(1U << 31) - 1) 745 #define XFS_MIN_RGEXTENTS ((xfs_rtxlen_t)2) 746 #define XFS_MAX_RGNUMBER ((xfs_rgnumber_t)(-1U)) 747 748 #define XFS_RTSB_MAGIC 0x46726F67 /* 'Frog' */ 749 750 /* 751 * Realtime superblock - on disk version. Must be padded to 64 bit alignment. 752 * The first block of the realtime volume contains this superblock. 753 */ 754 struct xfs_rtsb { 755 __be32 rsb_magicnum; /* magic number == XFS_RTSB_MAGIC */ 756 __le32 rsb_crc; /* superblock crc */ 757 758 __be32 rsb_pad; /* zero */ 759 unsigned char rsb_fname[XFSLABEL_MAX]; /* file system name */ 760 761 uuid_t rsb_uuid; /* user-visible file system unique id */ 762 uuid_t rsb_meta_uuid; /* metadata file system unique id */ 763 764 /* must be padded to 64 bit alignment */ 765 }; 766 767 #define XFS_RTSB_CRC_OFF offsetof(struct xfs_rtsb, rsb_crc) 768 #define XFS_RTSB_DADDR ((xfs_daddr_t)0) /* daddr in rt section */ 769 770 /* 771 * XFS Timestamps 772 * ============== 773 * 774 * Traditional ondisk inode timestamps consist of signed 32-bit counters for 775 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC 776 * 1970, which means that the timestamp epoch is the same as the Unix epoch. 777 * Therefore, the ondisk min and max defined here can be used directly to 778 * constrain the incore timestamps on a Unix system. Note that we actually 779 * encode a __be64 value on disk. 780 * 781 * When the bigtime feature is enabled, ondisk inode timestamps become an 782 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode 783 * timestamp epoch is the start of the classic timestamp range, which is 784 * Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers 785 * /must/ use the bigtime conversion functions when encoding and decoding raw 786 * timestamps. 787 */ 788 typedef __be64 xfs_timestamp_t; 789 790 /* Legacy timestamp encoding format. */ 791 struct xfs_legacy_timestamp { 792 __be32 t_sec; /* timestamp seconds */ 793 __be32 t_nsec; /* timestamp nanoseconds */ 794 }; 795 796 /* 797 * Smallest possible ondisk seconds value with traditional timestamps. This 798 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901. 799 */ 800 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN) 801 802 /* 803 * Largest possible ondisk seconds value with traditional timestamps. This 804 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038. 805 */ 806 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) 807 808 /* 809 * Smallest possible ondisk seconds value with bigtime timestamps. This 810 * corresponds (after conversion to a Unix timestamp) with the traditional 811 * minimum timestamp of Dec 13 20:45:52 UTC 1901. 812 */ 813 #define XFS_BIGTIME_TIME_MIN ((int64_t)0) 814 815 /* 816 * Largest supported ondisk seconds value with bigtime timestamps. This 817 * corresponds (after conversion to a Unix timestamp) with an incore timestamp 818 * of Jul 2 20:20:24 UTC 2486. 819 * 820 * We round down the ondisk limit so that the bigtime quota and inode max 821 * timestamps will be the same. 822 */ 823 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL)) 824 825 /* 826 * Bigtime epoch is set exactly to the minimum time value that a traditional 827 * 32-bit timestamp can represent when using the Unix epoch as a reference. 828 * Hence the Unix epoch is at a fixed offset into the supported bigtime 829 * timestamp range. 830 * 831 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS 832 * timestamp can represent so we will not lose any fidelity in converting 833 * to/from unix and bigtime timestamps. 834 * 835 * The following conversion factor converts a seconds counter from the Unix 836 * epoch to the bigtime epoch. 837 */ 838 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN) 839 840 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */ 841 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds) 842 { 843 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET; 844 } 845 846 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */ 847 static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds) 848 { 849 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET; 850 } 851 852 enum xfs_metafile_type { 853 XFS_METAFILE_UNKNOWN, /* unknown */ 854 XFS_METAFILE_DIR, /* metadir directory */ 855 XFS_METAFILE_USRQUOTA, /* user quota */ 856 XFS_METAFILE_GRPQUOTA, /* group quota */ 857 XFS_METAFILE_PRJQUOTA, /* project quota */ 858 XFS_METAFILE_RTBITMAP, /* rt bitmap */ 859 XFS_METAFILE_RTSUMMARY, /* rt summary */ 860 861 XFS_METAFILE_MAX 862 } __packed; 863 864 #define XFS_METAFILE_TYPE_STR \ 865 { XFS_METAFILE_UNKNOWN, "unknown" }, \ 866 { XFS_METAFILE_DIR, "dir" }, \ 867 { XFS_METAFILE_USRQUOTA, "usrquota" }, \ 868 { XFS_METAFILE_GRPQUOTA, "grpquota" }, \ 869 { XFS_METAFILE_PRJQUOTA, "prjquota" }, \ 870 { XFS_METAFILE_RTBITMAP, "rtbitmap" }, \ 871 { XFS_METAFILE_RTSUMMARY, "rtsummary" } 872 873 /* 874 * On-disk inode structure. 875 * 876 * This is just the header or "dinode core", the inode is expanded to fill a 877 * variable size the leftover area split into a data and an attribute fork. 878 * The format of the data and attribute fork depends on the format of the 879 * inode as indicated by di_format and di_aformat. To access the data and 880 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 881 * below. 882 * 883 * There is a very similar struct xfs_log_dinode which matches the layout of 884 * this structure, but is kept in native format instead of big endian. 885 * 886 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 887 * padding field for v3 inodes. 888 */ 889 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 890 struct xfs_dinode { 891 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 892 __be16 di_mode; /* mode and type of file */ 893 __u8 di_version; /* inode version */ 894 __u8 di_format; /* format of di_c data */ 895 __be16 di_metatype; /* XFS_METAFILE_*; was di_onlink */ 896 __be32 di_uid; /* owner's user id */ 897 __be32 di_gid; /* owner's group id */ 898 __be32 di_nlink; /* number of links to file */ 899 __be16 di_projid_lo; /* lower part of owner's project id */ 900 __be16 di_projid_hi; /* higher part owner's project id */ 901 union { 902 /* Number of data fork extents if NREXT64 is set */ 903 __be64 di_big_nextents; 904 905 /* Padding for V3 inodes without NREXT64 set. */ 906 __be64 di_v3_pad; 907 908 /* Padding and inode flush counter for V2 inodes. */ 909 struct { 910 __u8 di_v2_pad[6]; 911 __be16 di_flushiter; 912 }; 913 }; 914 xfs_timestamp_t di_atime; /* time last accessed */ 915 xfs_timestamp_t di_mtime; /* time last modified */ 916 xfs_timestamp_t di_ctime; /* time created/inode modified */ 917 __be64 di_size; /* number of bytes in file */ 918 __be64 di_nblocks; /* # of direct & btree blocks used */ 919 __be32 di_extsize; /* basic/minimum extent size for file */ 920 union { 921 /* 922 * For V2 inodes and V3 inodes without NREXT64 set, this 923 * is the number of data and attr fork extents. 924 */ 925 struct { 926 __be32 di_nextents; 927 __be16 di_anextents; 928 } __packed; 929 930 /* Number of attr fork extents if NREXT64 is set. */ 931 struct { 932 __be32 di_big_anextents; 933 __be16 di_nrext64_pad; 934 } __packed; 935 } __packed; 936 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 937 __s8 di_aformat; /* format of attr fork's data */ 938 __be32 di_dmevmask; /* DMIG event mask */ 939 __be16 di_dmstate; /* DMIG state info */ 940 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 941 __be32 di_gen; /* generation number */ 942 943 /* di_next_unlinked is the only non-core field in the old dinode */ 944 __be32 di_next_unlinked;/* agi unlinked list ptr */ 945 946 /* start of the extended dinode, writable fields */ 947 __le32 di_crc; /* CRC of the inode */ 948 __be64 di_changecount; /* number of attribute changes */ 949 __be64 di_lsn; /* flush sequence */ 950 __be64 di_flags2; /* more random flags */ 951 __be32 di_cowextsize; /* basic cow extent size for file */ 952 __u8 di_pad2[12]; /* more padding for future expansion */ 953 954 /* fields only written to during inode creation */ 955 xfs_timestamp_t di_crtime; /* time created */ 956 __be64 di_ino; /* inode number */ 957 uuid_t di_uuid; /* UUID of the filesystem */ 958 959 /* structure must be padded to 64 bit alignment */ 960 }; 961 962 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 963 964 #define DI_MAX_FLUSH 0xffff 965 966 /* 967 * Size of the core inode on disk. Version 1 and 2 inodes have 968 * the same size, but version 3 has grown a few additional fields. 969 */ 970 static inline uint xfs_dinode_size(int version) 971 { 972 if (version == 3) 973 return sizeof(struct xfs_dinode); 974 return offsetof(struct xfs_dinode, di_crc); 975 } 976 977 /* 978 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 979 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 980 */ 981 #define XFS_MAXLINK ((1U << 31) - 1U) 982 983 /* 984 * Any file that hits the maximum ondisk link count should be pinned to avoid 985 * a use-after-free situation. 986 */ 987 #define XFS_NLINK_PINNED (~0U) 988 989 /* 990 * Values for di_format 991 * 992 * This enum is used in string mapping in xfs_trace.h; please keep the 993 * TRACE_DEFINE_ENUMs for it up to date. 994 */ 995 enum xfs_dinode_fmt { 996 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 997 XFS_DINODE_FMT_LOCAL, /* bulk data */ 998 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 999 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 1000 XFS_DINODE_FMT_UUID /* added long ago, but never used */ 1001 }; 1002 1003 #define XFS_INODE_FORMAT_STR \ 1004 { XFS_DINODE_FMT_DEV, "dev" }, \ 1005 { XFS_DINODE_FMT_LOCAL, "local" }, \ 1006 { XFS_DINODE_FMT_EXTENTS, "extent" }, \ 1007 { XFS_DINODE_FMT_BTREE, "btree" }, \ 1008 { XFS_DINODE_FMT_UUID, "uuid" } 1009 1010 /* 1011 * Max values for extnum and aextnum. 1012 * 1013 * The original on-disk extent counts were held in signed fields, resulting in 1014 * maximum extent counts of 2^31 and 2^15 for the data and attr forks 1015 * respectively. Similarly the maximum extent length is limited to 2^21 blocks 1016 * by the 21-bit wide blockcount field of a BMBT extent record. 1017 * 1018 * The newly introduced data fork extent counter can hold a 64-bit value, 1019 * however the maximum number of extents in a file is also limited to 2^54 1020 * extents by the 54-bit wide startoff field of a BMBT extent record. 1021 * 1022 * It is further limited by the maximum supported file size of 2^63 1023 * *bytes*. This leads to a maximum extent count for maximally sized filesystem 1024 * blocks (64kB) of: 1025 * 1026 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks 1027 * 1028 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence 1029 * 2^48 was chosen as the maximum data fork extent count. 1030 * 1031 * The maximum file size that can be represented by the data fork extent counter 1032 * in the worst case occurs when all extents are 1 block in length and each 1033 * block is 1KB in size. 1034 * 1035 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and 1036 * with 1KB sized blocks, a file can reach upto, 1037 * 1KB * (2^31) = 2TB 1038 * 1039 * This is much larger than the theoretical maximum size of a directory 1040 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB. 1041 * 1042 * Hence, a directory inode can never overflow its data fork extent counter. 1043 */ 1044 #define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1)) 1045 #define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1)) 1046 #define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1)) 1047 #define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1)) 1048 1049 /* 1050 * When we upgrade an inode to the large extent counts, the maximum value by 1051 * which the extent count can increase is bound by the change in size of the 1052 * on-disk field. No upgrade operation should ever be adding more than a few 1053 * tens of extents, so if we get a really large value it is a sign of a code bug 1054 * or corruption. 1055 */ 1056 #define XFS_MAX_EXTCNT_UPGRADE_NR \ 1057 min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \ 1058 XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL) 1059 1060 /* 1061 * Inode minimum and maximum sizes. 1062 */ 1063 #define XFS_DINODE_MIN_LOG 8 1064 #define XFS_DINODE_MAX_LOG 11 1065 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 1066 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 1067 1068 /* 1069 * Inode size for given fs. 1070 */ 1071 #define XFS_DINODE_SIZE(mp) \ 1072 (xfs_has_v3inodes(mp) ? \ 1073 sizeof(struct xfs_dinode) : \ 1074 offsetof(struct xfs_dinode, di_crc)) 1075 #define XFS_LITINO(mp) \ 1076 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp)) 1077 1078 /* 1079 * Inode data & attribute fork sizes, per inode. 1080 */ 1081 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 1082 1083 #define XFS_DFORK_DSIZE(dip,mp) \ 1084 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp)) 1085 #define XFS_DFORK_ASIZE(dip,mp) \ 1086 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0) 1087 #define XFS_DFORK_SIZE(dip,mp,w) \ 1088 ((w) == XFS_DATA_FORK ? \ 1089 XFS_DFORK_DSIZE(dip, mp) : \ 1090 XFS_DFORK_ASIZE(dip, mp)) 1091 1092 #define XFS_DFORK_MAXEXT(dip, mp, w) \ 1093 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec)) 1094 1095 /* 1096 * Return pointers to the data or attribute forks. 1097 */ 1098 #define XFS_DFORK_DPTR(dip) \ 1099 ((void *)dip + xfs_dinode_size(dip->di_version)) 1100 #define XFS_DFORK_APTR(dip) \ 1101 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 1102 #define XFS_DFORK_PTR(dip,w) \ 1103 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 1104 1105 #define XFS_DFORK_FORMAT(dip,w) \ 1106 ((w) == XFS_DATA_FORK ? \ 1107 (dip)->di_format : \ 1108 (dip)->di_aformat) 1109 1110 /* 1111 * For block and character special files the 32bit dev_t is stored at the 1112 * beginning of the data fork. 1113 */ 1114 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1115 { 1116 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1117 } 1118 1119 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1120 { 1121 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1122 } 1123 1124 /* 1125 * Values for di_flags 1126 */ 1127 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1128 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1129 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1130 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1131 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1132 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1133 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1134 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1135 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1136 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1137 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1138 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1139 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1140 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1141 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1142 /* Do not use bit 15, di_flags is legacy and unchanging now */ 1143 1144 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1145 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1146 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1147 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1148 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1149 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1150 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1151 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1152 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1153 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1154 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1155 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1156 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1157 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1158 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1159 1160 #define XFS_DIFLAG_ANY \ 1161 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1162 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1163 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1164 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1165 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1166 1167 /* 1168 * Values for di_flags2 These start by being exposed to userspace in the upper 1169 * 16 bits of the XFS_XFLAG_s range. 1170 */ 1171 /* use DAX for this inode */ 1172 #define XFS_DIFLAG2_DAX_BIT 0 1173 1174 /* file's blocks may be shared */ 1175 #define XFS_DIFLAG2_REFLINK_BIT 1 1176 1177 /* copy on write extent size hint */ 1178 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 1179 1180 /* big timestamps */ 1181 #define XFS_DIFLAG2_BIGTIME_BIT 3 1182 1183 /* large extent counters */ 1184 #define XFS_DIFLAG2_NREXT64_BIT 4 1185 1186 /* 1187 * The inode contains filesystem metadata and can be found through the metadata 1188 * directory tree. Metadata inodes must satisfy the following constraints: 1189 * 1190 * - V5 filesystem (and ftype) are enabled; 1191 * - The only valid modes are regular files and directories; 1192 * - The access bits must be zero; 1193 * - DMAPI event and state masks are zero; 1194 * - The user and group IDs must be zero; 1195 * - The project ID can be used as a u32 annotation; 1196 * - The immutable, sync, noatime, nodump, nodefrag flags must be set. 1197 * - The dax flag must not be set. 1198 * - Directories must have nosymlinks set. 1199 * 1200 * These requirements are chosen defensively to minimize the ability of 1201 * userspace to read or modify the contents, should a metadata file ever 1202 * escape to userspace. 1203 * 1204 * There are further constraints on the directory tree itself: 1205 * 1206 * - Metadata inodes must never be resolvable through the root directory; 1207 * - They must never be accessed by userspace; 1208 * - Metadata directory entries must have correct ftype. 1209 * 1210 * Superblock-rooted metadata files must have the METADATA iflag set even 1211 * though they do not have a parent directory. 1212 */ 1213 #define XFS_DIFLAG2_METADATA_BIT 5 1214 1215 #define XFS_DIFLAG2_DAX (1ULL << XFS_DIFLAG2_DAX_BIT) 1216 #define XFS_DIFLAG2_REFLINK (1ULL << XFS_DIFLAG2_REFLINK_BIT) 1217 #define XFS_DIFLAG2_COWEXTSIZE (1ULL << XFS_DIFLAG2_COWEXTSIZE_BIT) 1218 #define XFS_DIFLAG2_BIGTIME (1ULL << XFS_DIFLAG2_BIGTIME_BIT) 1219 #define XFS_DIFLAG2_NREXT64 (1ULL << XFS_DIFLAG2_NREXT64_BIT) 1220 #define XFS_DIFLAG2_METADATA (1ULL << XFS_DIFLAG2_METADATA_BIT) 1221 1222 #define XFS_DIFLAG2_ANY \ 1223 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ 1224 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | XFS_DIFLAG2_METADATA) 1225 1226 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) 1227 { 1228 return dip->di_version >= 3 && 1229 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME)); 1230 } 1231 1232 static inline bool xfs_dinode_has_large_extent_counts( 1233 const struct xfs_dinode *dip) 1234 { 1235 return dip->di_version >= 3 && 1236 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64)); 1237 } 1238 1239 static inline bool xfs_dinode_is_metadir(const struct xfs_dinode *dip) 1240 { 1241 return dip->di_version >= 3 && 1242 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_METADATA)); 1243 } 1244 1245 /* 1246 * Inode number format: 1247 * low inopblog bits - offset in block 1248 * next agblklog bits - block number in ag 1249 * next agno_log bits - ag number 1250 * high agno_log-agblklog-inopblog bits - 0 1251 */ 1252 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1) 1253 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1254 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1255 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log) 1256 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1257 #define XFS_INO_BITS(mp) \ 1258 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1259 #define XFS_INO_TO_AGNO(mp,i) \ 1260 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1261 #define XFS_INO_TO_AGINO(mp,i) \ 1262 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1263 #define XFS_INO_TO_AGBNO(mp,i) \ 1264 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1265 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1266 #define XFS_INO_TO_OFFSET(mp,i) \ 1267 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1268 #define XFS_INO_TO_FSB(mp,i) \ 1269 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1270 #define XFS_AGINO_TO_INO(mp,a,i) \ 1271 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1272 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1273 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1274 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1275 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1276 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1277 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1278 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1279 1280 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1281 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1282 1283 /* 1284 * RealTime Device format definitions 1285 */ 1286 1287 /* Min and max rt extent sizes, specified in bytes */ 1288 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1289 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1290 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1291 1292 /* 1293 * RT bit manipulation macros. 1294 */ 1295 #define XFS_RTBITMAP_MAGIC 0x424D505A /* BMPZ */ 1296 #define XFS_RTSUMMARY_MAGIC 0x53554D59 /* SUMY */ 1297 1298 struct xfs_rtbuf_blkinfo { 1299 __be32 rt_magic; /* validity check on block */ 1300 __be32 rt_crc; /* CRC of block */ 1301 __be64 rt_owner; /* inode that owns the block */ 1302 __be64 rt_blkno; /* first block of the buffer */ 1303 __be64 rt_lsn; /* sequence number of last write */ 1304 uuid_t rt_uuid; /* filesystem we belong to */ 1305 }; 1306 1307 #define XFS_RTBUF_CRC_OFF \ 1308 offsetof(struct xfs_rtbuf_blkinfo, rt_crc) 1309 1310 /* 1311 * Dquot and dquot block format definitions 1312 */ 1313 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1314 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */ 1315 1316 #define XFS_DQTYPE_USER (1u << 0) /* user dquot record */ 1317 #define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */ 1318 #define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */ 1319 #define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */ 1320 1321 /* bitmask to determine if this is a user/group/project dquot */ 1322 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \ 1323 XFS_DQTYPE_PROJ | \ 1324 XFS_DQTYPE_GROUP) 1325 1326 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \ 1327 XFS_DQTYPE_BIGTIME) 1328 1329 /* 1330 * XFS Quota Timers 1331 * ================ 1332 * 1333 * Traditional quota grace period expiration timers are an unsigned 32-bit 1334 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970. 1335 * Note that an expiration value of zero means that the quota limit has not 1336 * been reached, and therefore no expiration has been set. Therefore, the 1337 * ondisk min and max defined here can be used directly to constrain the incore 1338 * quota expiration timestamps on a Unix system. 1339 * 1340 * When bigtime is enabled, we trade two bits of precision to expand the 1341 * expiration timeout range to match that of big inode timestamps. The min and 1342 * max recorded here are the on-disk limits, not a Unix timestamp. 1343 * 1344 * The grace period for each quota type is stored in the root dquot (id = 0) 1345 * and is applied to a non-root dquot when it exceeds the soft or hard limits. 1346 * The length of quota grace periods are unsigned 32-bit quantities measured in 1347 * units of seconds. A value of zero means to use the default period. 1348 */ 1349 1350 /* 1351 * Smallest possible ondisk quota expiration value with traditional timestamps. 1352 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970. 1353 */ 1354 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1) 1355 1356 /* 1357 * Largest possible ondisk quota expiration value with traditional timestamps. 1358 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106. 1359 */ 1360 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX) 1361 1362 /* 1363 * Smallest possible ondisk quota expiration value with bigtime timestamps. 1364 * This corresponds (after conversion to a Unix timestamp) with the incore 1365 * expiration of Jan 1 00:00:04 UTC 1970. 1366 */ 1367 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN) 1368 1369 /* 1370 * Largest supported ondisk quota expiration value with bigtime timestamps. 1371 * This corresponds (after conversion to a Unix timestamp) with an incore 1372 * expiration of Jul 2 20:20:24 UTC 2486. 1373 * 1374 * The ondisk field supports values up to -1U, which corresponds to an incore 1375 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp, 1376 * so we cap the maximum bigtime quota expiration to the max inode timestamp. 1377 */ 1378 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U) 1379 1380 /* 1381 * The following conversion factors assist in converting a quota expiration 1382 * timestamp between the incore and ondisk formats. 1383 */ 1384 #define XFS_DQ_BIGTIME_SHIFT (2) 1385 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1) 1386 1387 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */ 1388 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds) 1389 { 1390 /* 1391 * Round the expiration timestamp up to the nearest bigtime timestamp 1392 * that we can store, to give users the most time to fix problems. 1393 */ 1394 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >> 1395 XFS_DQ_BIGTIME_SHIFT; 1396 } 1397 1398 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */ 1399 static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds) 1400 { 1401 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT; 1402 } 1403 1404 /* 1405 * Default quota grace periods, ranging from zero (use the compiled defaults) 1406 * to ~136 years. These are applied to a non-root dquot that has exceeded 1407 * either limit. 1408 */ 1409 #define XFS_DQ_GRACE_MIN ((int64_t)0) 1410 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX) 1411 1412 /* Maximum id value for a quota record */ 1413 #define XFS_DQ_ID_MAX (U32_MAX) 1414 1415 /* 1416 * This is the main portion of the on-disk representation of quota information 1417 * for a user. We pad this with some more expansion room to construct the on 1418 * disk structure. 1419 */ 1420 struct xfs_disk_dquot { 1421 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1422 __u8 d_version; /* dquot version */ 1423 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */ 1424 __be32 d_id; /* user,project,group id */ 1425 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1426 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1427 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1428 __be64 d_ino_softlimit;/* preferred inode limit */ 1429 __be64 d_bcount; /* disk blocks owned by the user */ 1430 __be64 d_icount; /* inodes owned by the user */ 1431 __be32 d_itimer; /* zero if within inode limits if not, 1432 this is when we refuse service */ 1433 __be32 d_btimer; /* similar to above; for disk blocks */ 1434 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1435 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1436 __be32 d_pad0; /* 64 bit align */ 1437 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1438 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1439 __be64 d_rtbcount; /* realtime blocks owned */ 1440 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1441 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1442 __be16 d_pad; 1443 }; 1444 1445 /* 1446 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1447 * carrying the unnecessary padding would be a waste of memory. 1448 */ 1449 struct xfs_dqblk { 1450 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */ 1451 char dd_fill[4];/* filling for posterity */ 1452 1453 /* 1454 * These two are only present on filesystems with the CRC bits set. 1455 */ 1456 __be32 dd_crc; /* checksum */ 1457 __be64 dd_lsn; /* last modification in log */ 1458 uuid_t dd_uuid; /* location information */ 1459 }; 1460 1461 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1462 1463 /* 1464 * This defines the unit of allocation of dquots. 1465 * 1466 * Currently, it is just one file system block, and a 4K blk contains 30 1467 * (136 * 30 = 4080) dquots. It's probably not worth trying to make 1468 * this more dynamic. 1469 * 1470 * However, if this number is changed, we have to make sure that we don't 1471 * implicitly assume that we do allocations in chunks of a single filesystem 1472 * block in the dquot/xqm code. 1473 * 1474 * This is part of the ondisk format because the structure size is not a power 1475 * of two, which leaves slack at the end of the disk block. 1476 */ 1477 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1 1478 1479 /* 1480 * Remote symlink format and access functions. 1481 */ 1482 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1483 1484 struct xfs_dsymlink_hdr { 1485 __be32 sl_magic; 1486 __be32 sl_offset; 1487 __be32 sl_bytes; 1488 __be32 sl_crc; 1489 uuid_t sl_uuid; 1490 __be64 sl_owner; 1491 __be64 sl_blkno; 1492 __be64 sl_lsn; 1493 }; 1494 1495 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1496 1497 #define XFS_SYMLINK_MAXLEN 1024 1498 /* 1499 * The maximum pathlen is 1024 bytes. Since the minimum file system 1500 * blocksize is 512 bytes, we can get a max of 3 extents back from 1501 * bmapi when crc headers are taken into account. 1502 */ 1503 #define XFS_SYMLINK_MAPS 3 1504 1505 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1506 ((bufsize) - (xfs_has_crc((mp)) ? \ 1507 sizeof(struct xfs_dsymlink_hdr) : 0)) 1508 1509 1510 /* 1511 * Allocation Btree format definitions 1512 * 1513 * There are two on-disk btrees, one sorted by blockno and one sorted 1514 * by blockcount and blockno. All blocks look the same to make the code 1515 * simpler; if we have time later, we'll make the optimizations. 1516 */ 1517 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1518 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1519 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1520 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1521 1522 /* 1523 * Data record/key structure 1524 */ 1525 typedef struct xfs_alloc_rec { 1526 __be32 ar_startblock; /* starting block number */ 1527 __be32 ar_blockcount; /* count of free blocks */ 1528 } xfs_alloc_rec_t, xfs_alloc_key_t; 1529 1530 typedef struct xfs_alloc_rec_incore { 1531 xfs_agblock_t ar_startblock; /* starting block number */ 1532 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1533 } xfs_alloc_rec_incore_t; 1534 1535 /* btree pointer type */ 1536 typedef __be32 xfs_alloc_ptr_t; 1537 1538 /* 1539 * Block numbers in the AG: 1540 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1541 */ 1542 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1543 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1544 1545 1546 /* 1547 * Inode Allocation Btree format definitions 1548 * 1549 * There is a btree for the inode map per allocation group. 1550 */ 1551 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1552 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1553 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1554 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1555 1556 typedef uint64_t xfs_inofree_t; 1557 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1558 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1559 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1560 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1561 1562 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1563 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t)) 1564 #define XFS_INODES_PER_HOLEMASK_BIT \ 1565 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t))) 1566 1567 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1568 { 1569 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1570 } 1571 1572 /* 1573 * The on-disk inode record structure has two formats. The original "full" 1574 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1575 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1576 * count. 1577 * 1578 * The holemask of the sparse record format allows an inode chunk to have holes 1579 * that refer to blocks not owned by the inode record. This facilitates inode 1580 * allocation in the event of severe free space fragmentation. 1581 */ 1582 typedef struct xfs_inobt_rec { 1583 __be32 ir_startino; /* starting inode number */ 1584 union { 1585 struct { 1586 __be32 ir_freecount; /* count of free inodes */ 1587 } f; 1588 struct { 1589 __be16 ir_holemask;/* hole mask for sparse chunks */ 1590 __u8 ir_count; /* total inode count */ 1591 __u8 ir_freecount; /* count of free inodes */ 1592 } sp; 1593 } ir_u; 1594 __be64 ir_free; /* free inode mask */ 1595 } xfs_inobt_rec_t; 1596 1597 typedef struct xfs_inobt_rec_incore { 1598 xfs_agino_t ir_startino; /* starting inode number */ 1599 uint16_t ir_holemask; /* hole mask for sparse chunks */ 1600 uint8_t ir_count; /* total inode count */ 1601 uint8_t ir_freecount; /* count of free inodes (set bits) */ 1602 xfs_inofree_t ir_free; /* free inode mask */ 1603 } xfs_inobt_rec_incore_t; 1604 1605 static inline bool xfs_inobt_issparse(uint16_t holemask) 1606 { 1607 /* non-zero holemask represents a sparse rec. */ 1608 return holemask; 1609 } 1610 1611 /* 1612 * Key structure 1613 */ 1614 typedef struct xfs_inobt_key { 1615 __be32 ir_startino; /* starting inode number */ 1616 } xfs_inobt_key_t; 1617 1618 /* btree pointer type */ 1619 typedef __be32 xfs_inobt_ptr_t; 1620 1621 /* 1622 * block numbers in the AG. 1623 */ 1624 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1625 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1626 1627 /* 1628 * Reverse mapping btree format definitions 1629 * 1630 * There is a btree for the reverse map per allocation group 1631 */ 1632 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1633 1634 /* 1635 * Ownership info for an extent. This is used to create reverse-mapping 1636 * entries. 1637 */ 1638 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1639 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1640 struct xfs_owner_info { 1641 uint64_t oi_owner; 1642 xfs_fileoff_t oi_offset; 1643 unsigned int oi_flags; 1644 }; 1645 1646 /* 1647 * Special owner types. 1648 * 1649 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1650 * to tell us we have a special owner value. We use these for static metadata 1651 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1652 */ 1653 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1654 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1655 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1656 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1657 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1658 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1659 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1660 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1661 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1662 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1663 1664 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1665 1666 /* 1667 * Data record structure 1668 */ 1669 struct xfs_rmap_rec { 1670 __be32 rm_startblock; /* extent start block */ 1671 __be32 rm_blockcount; /* extent length */ 1672 __be64 rm_owner; /* extent owner */ 1673 __be64 rm_offset; /* offset within the owner */ 1674 }; 1675 1676 /* 1677 * rmap btree record 1678 * rm_offset:63 is the attribute fork flag 1679 * rm_offset:62 is the bmbt block flag 1680 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1681 * rm_offset:54-60 aren't used and should be zero 1682 * rm_offset:0-53 is the block offset within the inode 1683 */ 1684 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63) 1685 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62) 1686 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61) 1687 1688 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U) 1689 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1690 XFS_RMAP_OFF_BMBT_BLOCK | \ 1691 XFS_RMAP_OFF_UNWRITTEN) 1692 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL) 1693 1694 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1695 1696 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1697 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1698 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1699 1700 #define RMAPBT_STARTBLOCK_BITLEN 32 1701 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1702 #define RMAPBT_OWNER_BITLEN 64 1703 #define RMAPBT_ATTRFLAG_BITLEN 1 1704 #define RMAPBT_BMBTFLAG_BITLEN 1 1705 #define RMAPBT_EXNTFLAG_BITLEN 1 1706 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1707 #define RMAPBT_OFFSET_BITLEN 54 1708 1709 /* 1710 * Key structure 1711 * 1712 * We don't use the length for lookups 1713 */ 1714 struct xfs_rmap_key { 1715 __be32 rm_startblock; /* extent start block */ 1716 __be64 rm_owner; /* extent owner */ 1717 __be64 rm_offset; /* offset within the owner */ 1718 } __attribute__((packed)); 1719 1720 /* btree pointer type */ 1721 typedef __be32 xfs_rmap_ptr_t; 1722 1723 #define XFS_RMAP_BLOCK(mp) \ 1724 (xfs_has_finobt(((mp))) ? \ 1725 XFS_FIBT_BLOCK(mp) + 1 : \ 1726 XFS_IBT_BLOCK(mp) + 1) 1727 1728 /* 1729 * Reference Count Btree format definitions 1730 * 1731 */ 1732 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1733 1734 unsigned int xfs_refc_block(struct xfs_mount *mp); 1735 1736 /* 1737 * Data record/key structure 1738 * 1739 * Each record associates a range of physical blocks (starting at 1740 * rc_startblock and ending rc_blockcount blocks later) with a reference 1741 * count (rc_refcount). Extents that are being used to stage a copy on 1742 * write (CoW) operation are recorded in the refcount btree with a 1743 * refcount of 1. All other records must have a refcount > 1 and must 1744 * track an extent mapped only by file data forks. 1745 * 1746 * Extents with a single owner (attributes, metadata, non-shared file 1747 * data) are not tracked here. Free space is also not tracked here. 1748 * This is consistent with pre-reflink XFS. 1749 */ 1750 1751 /* 1752 * Extents that are being used to stage a copy on write are stored 1753 * in the refcount btree with a refcount of 1 and the upper bit set 1754 * on the startblock. This speeds up mount time deletion of stale 1755 * staging extents because they're all at the right side of the tree. 1756 */ 1757 #define XFS_REFC_COWFLAG (1U << 31) 1758 #define REFCNTBT_COWFLAG_BITLEN 1 1759 #define REFCNTBT_AGBLOCK_BITLEN 31 1760 1761 struct xfs_refcount_rec { 1762 __be32 rc_startblock; /* starting block number */ 1763 __be32 rc_blockcount; /* count of blocks */ 1764 __be32 rc_refcount; /* number of inodes linked here */ 1765 }; 1766 1767 struct xfs_refcount_key { 1768 __be32 rc_startblock; /* starting block number */ 1769 }; 1770 1771 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1772 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1773 1774 /* btree pointer type */ 1775 typedef __be32 xfs_refcount_ptr_t; 1776 1777 1778 /* 1779 * BMAP Btree format definitions 1780 * 1781 * This includes both the root block definition that sits inside an inode fork 1782 * and the record/pointer formats for the leaf/node in the blocks. 1783 */ 1784 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1785 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1786 1787 /* 1788 * Bmap root header, on-disk form only. 1789 */ 1790 typedef struct xfs_bmdr_block { 1791 __be16 bb_level; /* 0 is a leaf */ 1792 __be16 bb_numrecs; /* current # of data records */ 1793 } xfs_bmdr_block_t; 1794 1795 /* 1796 * Bmap btree record and extent descriptor. 1797 * l0:63 is an extent flag (value 1 indicates non-normal). 1798 * l0:9-62 are startoff. 1799 * l0:0-8 and l1:21-63 are startblock. 1800 * l1:0-20 are blockcount. 1801 */ 1802 #define BMBT_EXNTFLAG_BITLEN 1 1803 #define BMBT_STARTOFF_BITLEN 54 1804 #define BMBT_STARTBLOCK_BITLEN 52 1805 #define BMBT_BLOCKCOUNT_BITLEN 21 1806 1807 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1) 1808 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1) 1809 1810 #define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK)) 1811 1812 /* 1813 * bmbt records have a file offset (block) field that is 54 bits wide, so this 1814 * is the largest xfs_fileoff_t that we ever expect to see. 1815 */ 1816 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK) 1817 1818 typedef struct xfs_bmbt_rec { 1819 __be64 l0, l1; 1820 } xfs_bmbt_rec_t; 1821 1822 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1823 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1824 1825 /* 1826 * Values and macros for delayed-allocation startblock fields. 1827 */ 1828 #define STARTBLOCKVALBITS 17 1829 #define STARTBLOCKMASKBITS (15 + 20) 1830 #define STARTBLOCKMASK \ 1831 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1832 1833 static inline int isnullstartblock(xfs_fsblock_t x) 1834 { 1835 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1836 } 1837 1838 static inline xfs_fsblock_t nullstartblock(int k) 1839 { 1840 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1841 return STARTBLOCKMASK | (k); 1842 } 1843 1844 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1845 { 1846 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1847 } 1848 1849 /* 1850 * Key structure for non-leaf levels of the tree. 1851 */ 1852 typedef struct xfs_bmbt_key { 1853 __be64 br_startoff; /* starting file offset */ 1854 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1855 1856 /* btree pointer type */ 1857 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1858 1859 1860 /* 1861 * Generic Btree block format definitions 1862 * 1863 * This is a combination of the actual format used on disk for short and long 1864 * format btrees. The first three fields are shared by both format, but the 1865 * pointers are different and should be used with care. 1866 * 1867 * To get the size of the actual short or long form headers please use the size 1868 * macros below. Never use sizeof(xfs_btree_block). 1869 * 1870 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1871 * with the crc feature bit, and all accesses to them must be conditional on 1872 * that flag. 1873 */ 1874 /* short form block header */ 1875 struct xfs_btree_block_shdr { 1876 __be32 bb_leftsib; 1877 __be32 bb_rightsib; 1878 1879 __be64 bb_blkno; 1880 __be64 bb_lsn; 1881 uuid_t bb_uuid; 1882 __be32 bb_owner; 1883 __le32 bb_crc; 1884 }; 1885 1886 /* long form block header */ 1887 struct xfs_btree_block_lhdr { 1888 __be64 bb_leftsib; 1889 __be64 bb_rightsib; 1890 1891 __be64 bb_blkno; 1892 __be64 bb_lsn; 1893 uuid_t bb_uuid; 1894 __be64 bb_owner; 1895 __le32 bb_crc; 1896 __be32 bb_pad; /* padding for alignment */ 1897 }; 1898 1899 struct xfs_btree_block { 1900 __be32 bb_magic; /* magic number for block type */ 1901 __be16 bb_level; /* 0 is a leaf */ 1902 __be16 bb_numrecs; /* current # of data records */ 1903 union { 1904 struct xfs_btree_block_shdr s; 1905 struct xfs_btree_block_lhdr l; 1906 } bb_u; /* rest */ 1907 }; 1908 1909 /* size of a short form block */ 1910 #define XFS_BTREE_SBLOCK_LEN \ 1911 (offsetof(struct xfs_btree_block, bb_u) + \ 1912 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1913 /* size of a long form block */ 1914 #define XFS_BTREE_LBLOCK_LEN \ 1915 (offsetof(struct xfs_btree_block, bb_u) + \ 1916 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1917 1918 /* sizes of CRC enabled btree blocks */ 1919 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1920 (offsetof(struct xfs_btree_block, bb_u) + \ 1921 sizeof(struct xfs_btree_block_shdr)) 1922 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1923 (offsetof(struct xfs_btree_block, bb_u) + \ 1924 sizeof(struct xfs_btree_block_lhdr)) 1925 1926 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1927 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1928 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1929 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1930 1931 /* 1932 * On-disk XFS access control list structure. 1933 */ 1934 struct xfs_acl_entry { 1935 __be32 ae_tag; 1936 __be32 ae_id; 1937 __be16 ae_perm; 1938 __be16 ae_pad; /* fill the implicit hole in the structure */ 1939 }; 1940 1941 struct xfs_acl { 1942 __be32 acl_cnt; 1943 struct xfs_acl_entry acl_entry[]; 1944 }; 1945 1946 /* 1947 * The number of ACL entries allowed is defined by the on-disk format. 1948 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1949 * limited only by the maximum size of the xattr that stores the information. 1950 */ 1951 #define XFS_ACL_MAX_ENTRIES(mp) \ 1952 (xfs_has_crc(mp) \ 1953 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1954 sizeof(struct xfs_acl_entry) \ 1955 : 25) 1956 1957 #define XFS_ACL_SIZE(cnt) \ 1958 (sizeof(struct xfs_acl) + \ 1959 sizeof(struct xfs_acl_entry) * cnt) 1960 1961 #define XFS_ACL_MAX_SIZE(mp) \ 1962 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1963 1964 1965 /* On-disk XFS extended attribute names */ 1966 #define SGI_ACL_FILE "SGI_ACL_FILE" 1967 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1968 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1969 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1970 1971 #endif /* __XFS_FORMAT_H__ */ 1972