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xfs_format.h
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linux-6.19.14/fs/xfs/libxfs/xfs_format.h
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 18struct xfs_mount; 19struct xfs_trans; 20struct xfs_inode; 21struct xfs_buf; 22struct 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 */ 95typedef 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] __nonstring; /* 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 uint8_t sb_rgblklog; /* rt group number shift */ 182 uint8_t sb_pad[7]; /* zeroes */ 183 xfs_rfsblock_t sb_rtstart; /* start of internal RT section (FSB) */ 184 xfs_filblks_t sb_rtreserved; /* reserved (zoned) RT blocks */ 185 186 /* must be padded to 64 bit alignment */ 187} xfs_sb_t; 188 189/* 190 * Superblock - on disk version. 191 * Must be padded to 64 bit alignment. 192 */ 193struct xfs_dsb { 194 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 195 __be32 sb_blocksize; /* logical block size, bytes */ 196 __be64 sb_dblocks; /* number of data blocks */ 197 __be64 sb_rblocks; /* number of realtime blocks */ 198 __be64 sb_rextents; /* number of realtime extents */ 199 uuid_t sb_uuid; /* user-visible file system unique id */ 200 __be64 sb_logstart; /* starting block of log if internal */ 201 __be64 sb_rootino; /* root inode number */ 202 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 203 __be64 sb_rsumino; /* summary inode for rt bitmap */ 204 __be32 sb_rextsize; /* realtime extent size, blocks */ 205 __be32 sb_agblocks; /* size of an allocation group */ 206 __be32 sb_agcount; /* number of allocation groups */ 207 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 208 __be32 sb_logblocks; /* number of log blocks */ 209 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 210 __be16 sb_sectsize; /* volume sector size, bytes */ 211 __be16 sb_inodesize; /* inode size, bytes */ 212 __be16 sb_inopblock; /* inodes per block */ 213 char sb_fname[XFSLABEL_MAX]; /* file system name */ 214 __u8 sb_blocklog; /* log2 of sb_blocksize */ 215 __u8 sb_sectlog; /* log2 of sb_sectsize */ 216 __u8 sb_inodelog; /* log2 of sb_inodesize */ 217 __u8 sb_inopblog; /* log2 of sb_inopblock */ 218 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 219 __u8 sb_rextslog; /* log2 of sb_rextents */ 220 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 221 __u8 sb_imax_pct; /* max % of fs for inode space */ 222 /* statistics */ 223 /* 224 * These fields must remain contiguous. If you really 225 * want to change their layout, make sure you fix the 226 * code in xfs_trans_apply_sb_deltas(). 227 */ 228 __be64 sb_icount; /* allocated inodes */ 229 __be64 sb_ifree; /* free inodes */ 230 __be64 sb_fdblocks; /* free data blocks */ 231 __be64 sb_frextents; /* free realtime extents */ 232 /* 233 * End contiguous fields. 234 */ 235 __be64 sb_uquotino; /* user quota inode */ 236 __be64 sb_gquotino; /* group quota inode */ 237 __be16 sb_qflags; /* quota flags */ 238 __u8 sb_flags; /* misc. flags */ 239 __u8 sb_shared_vn; /* shared version number */ 240 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 241 __be32 sb_unit; /* stripe or raid unit */ 242 __be32 sb_width; /* stripe or raid width */ 243 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 244 __u8 sb_logsectlog; /* log2 of the log sector size */ 245 __be16 sb_logsectsize; /* sector size for the log, bytes */ 246 __be32 sb_logsunit; /* stripe unit size for the log */ 247 __be32 sb_features2; /* additional feature bits */ 248 /* 249 * bad features2 field as a result of failing to pad the sb 250 * structure to 64 bits. Some machines will be using this field 251 * for features2 bits. Easiest just to mark it bad and not use 252 * it for anything else. 253 */ 254 __be32 sb_bad_features2; 255 256 /* version 5 superblock fields start here */ 257 258 /* feature masks */ 259 __be32 sb_features_compat; 260 __be32 sb_features_ro_compat; 261 __be32 sb_features_incompat; 262 __be32 sb_features_log_incompat; 263 264 __le32 sb_crc; /* superblock crc */ 265 __be32 sb_spino_align; /* sparse inode chunk alignment */ 266 267 __be64 sb_pquotino; /* project quota inode */ 268 __be64 sb_lsn; /* last write sequence */ 269 uuid_t sb_meta_uuid; /* metadata file system unique id */ 270 271 __be64 sb_metadirino; /* metadata directory tree root */ 272 __be32 sb_rgcount; /* # of realtime groups */ 273 __be32 sb_rgextents; /* size of rtgroup in rtx */ 274 __u8 sb_rgblklog; /* rt group number shift */ 275 __u8 sb_pad[7]; /* zeroes */ 276 __be64 sb_rtstart; /* start of internal RT section (FSB) */ 277 __be64 sb_rtreserved; /* reserved (zoned) RT blocks */ 278 279 /* 280 * The size of this structure must be padded to 64 bit alignment. 281 * 282 * NOTE: Don't forget to update secondary_sb_whack in xfs_repair when 283 * adding new fields here. 284 */ 285}; 286 287#define XFS_SB_CRC_OFF offsetof(struct xfs_dsb, sb_crc) 288 289/* 290 * Misc. Flags - warning - these will be cleared by xfs_repair unless 291 * a feature bit is set when the flag is used. 292 */ 293#define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 294#define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 295 296/* 297 * define max. shared version we can interoperate with 298 */ 299#define XFS_SB_MAX_SHARED_VN 0 300 301#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 302 303static inline bool xfs_sb_is_v5(const struct xfs_sb *sbp) 304{ 305 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 306} 307 308/* 309 * Detect a mismatched features2 field. Older kernels read/wrote 310 * this into the wrong slot, so to be safe we keep them in sync. 311 */ 312static inline bool xfs_sb_has_mismatched_features2(const struct xfs_sb *sbp) 313{ 314 return sbp->sb_bad_features2 != sbp->sb_features2; 315} 316 317static inline bool xfs_sb_version_hasmorebits(const struct xfs_sb *sbp) 318{ 319 return xfs_sb_is_v5(sbp) || 320 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 321} 322 323static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 324{ 325 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 326} 327 328static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 329{ 330 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 331} 332 333static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 334{ 335 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 336 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 337} 338 339static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp) 340{ 341 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 342 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 343} 344 345/* 346 * Extended v5 superblock feature masks. These are to be used for new v5 347 * superblock features only. 348 * 349 * Compat features are new features that old kernels will not notice or affect 350 * and so can mount read-write without issues. 351 * 352 * RO-Compat (read only) are features that old kernels can read but will break 353 * if they write. Hence only read-only mounts of such filesystems are allowed on 354 * kernels that don't support the feature bit. 355 * 356 * InCompat features are features which old kernels will not understand and so 357 * must not mount. 358 * 359 * Log-InCompat features are for changes to log formats or new transactions that 360 * can't be replayed on older kernels. The fields are set when the filesystem is 361 * mounted, and a clean unmount clears the fields. 362 */ 363#define XFS_SB_FEAT_COMPAT_ALL 0 364#define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 365static inline bool 366xfs_sb_has_compat_feature( 367 const struct xfs_sb *sbp, 368 uint32_t feature) 369{ 370 return (sbp->sb_features_compat & feature) != 0; 371} 372 373#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 374#define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ 375#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ 376#define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ 377#define XFS_SB_FEAT_RO_COMPAT_ALL \ 378 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 379 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 380 XFS_SB_FEAT_RO_COMPAT_REFLINK| \ 381 XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 382#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 383static inline bool 384xfs_sb_has_ro_compat_feature( 385 const struct xfs_sb *sbp, 386 uint32_t feature) 387{ 388 return (sbp->sb_features_ro_compat & feature) != 0; 389} 390 391#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 392#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 393#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 394#define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ 395#define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */ 396#define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */ 397#define XFS_SB_FEAT_INCOMPAT_EXCHRANGE (1 << 6) /* exchangerange supported */ 398#define XFS_SB_FEAT_INCOMPAT_PARENT (1 << 7) /* parent pointers */ 399#define XFS_SB_FEAT_INCOMPAT_METADIR (1 << 8) /* metadata dir tree */ 400#define XFS_SB_FEAT_INCOMPAT_ZONED (1 << 9) /* zoned RT allocator */ 401#define XFS_SB_FEAT_INCOMPAT_ZONE_GAPS (1 << 10) /* RTGs have LBA gaps */ 402 403#define XFS_SB_FEAT_INCOMPAT_ALL \ 404 (XFS_SB_FEAT_INCOMPAT_FTYPE | \ 405 XFS_SB_FEAT_INCOMPAT_SPINODES | \ 406 XFS_SB_FEAT_INCOMPAT_META_UUID | \ 407 XFS_SB_FEAT_INCOMPAT_BIGTIME | \ 408 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR | \ 409 XFS_SB_FEAT_INCOMPAT_NREXT64 | \ 410 XFS_SB_FEAT_INCOMPAT_EXCHRANGE | \ 411 XFS_SB_FEAT_INCOMPAT_PARENT | \ 412 XFS_SB_FEAT_INCOMPAT_METADIR | \ 413 XFS_SB_FEAT_INCOMPAT_ZONED | \ 414 XFS_SB_FEAT_INCOMPAT_ZONE_GAPS) 415 416#define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 417static inline bool 418xfs_sb_has_incompat_feature( 419 const struct xfs_sb *sbp, 420 uint32_t feature) 421{ 422 return (sbp->sb_features_incompat & feature) != 0; 423} 424 425#define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */ 426#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \ 427 (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS) 428#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 429static inline bool 430xfs_sb_has_incompat_log_feature( 431 const struct xfs_sb *sbp, 432 uint32_t feature) 433{ 434 return (sbp->sb_features_log_incompat & feature) != 0; 435} 436 437static inline void 438xfs_sb_remove_incompat_log_features( 439 struct xfs_sb *sbp) 440{ 441 sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL; 442} 443 444static inline void 445xfs_sb_add_incompat_log_features( 446 struct xfs_sb *sbp, 447 unsigned int features) 448{ 449 sbp->sb_features_log_incompat |= features; 450} 451 452static inline bool xfs_sb_version_haslogxattrs(const struct xfs_sb *sbp) 453{ 454 return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat & 455 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS); 456} 457 458static inline bool 459xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 460{ 461 return (ino == sbp->sb_uquotino || 462 ino == sbp->sb_gquotino || 463 ino == sbp->sb_pquotino); 464} 465 466#define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 467#define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 468 469#define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 470#define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 471 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 472#define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 473 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 474 475/* 476 * File system sector to basic block conversions. 477 */ 478#define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 479 480/* 481 * File system block to basic block conversions. 482 */ 483#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 484#define XFS_BB_TO_FSB(mp,bb) \ 485 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 486#define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 487 488/* 489 * File system block to byte conversions. 490 */ 491#define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 492#define XFS_B_TO_FSB(mp,b) \ 493 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 494#define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 495 496/* 497 * Allocation group header 498 * 499 * This is divided into three structures, placed in sequential 512-byte 500 * buffers after a copy of the superblock (also in a 512-byte buffer). 501 */ 502#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 503#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 504#define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 505#define XFS_AGF_VERSION 1 506#define XFS_AGI_VERSION 1 507 508#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 509#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 510 511/* 512 * agf_cnt_level in the first AGF overlaps the EFS superblock's magic number. 513 * Since the magic numbers valid for EFS are > 64k, our value cannot be confused 514 * for an EFS superblock. 515 */ 516 517typedef struct xfs_agf { 518 /* 519 * Common allocation group header information 520 */ 521 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 522 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 523 __be32 agf_seqno; /* sequence # starting from 0 */ 524 __be32 agf_length; /* size in blocks of a.g. */ 525 /* 526 * Freespace and rmap information 527 */ 528 __be32 agf_bno_root; /* bnobt root block */ 529 __be32 agf_cnt_root; /* cntbt root block */ 530 __be32 agf_rmap_root; /* rmapbt root block */ 531 532 __be32 agf_bno_level; /* bnobt btree levels */ 533 __be32 agf_cnt_level; /* cntbt btree levels */ 534 __be32 agf_rmap_level; /* rmapbt btree levels */ 535 536 __be32 agf_flfirst; /* first freelist block's index */ 537 __be32 agf_fllast; /* last freelist block's index */ 538 __be32 agf_flcount; /* count of blocks in freelist */ 539 __be32 agf_freeblks; /* total free blocks */ 540 541 __be32 agf_longest; /* longest free space */ 542 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 543 uuid_t agf_uuid; /* uuid of filesystem */ 544 545 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 546 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 547 548 __be32 agf_refcount_root; /* refcount tree root block */ 549 __be32 agf_refcount_level; /* refcount btree levels */ 550 551 /* 552 * reserve some contiguous space for future logged fields before we add 553 * the unlogged fields. This makes the range logging via flags and 554 * structure offsets much simpler. 555 */ 556 __be64 agf_spare64[14]; 557 558 /* unlogged fields, written during buffer writeback. */ 559 __be64 agf_lsn; /* last write sequence */ 560 __be32 agf_crc; /* crc of agf sector */ 561 __be32 agf_spare2; 562 563 /* structure must be padded to 64 bit alignment */ 564} xfs_agf_t; 565 566#define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 567 568#define XFS_AGF_MAGICNUM (1u << 0) 569#define XFS_AGF_VERSIONNUM (1u << 1) 570#define XFS_AGF_SEQNO (1u << 2) 571#define XFS_AGF_LENGTH (1u << 3) 572#define XFS_AGF_ROOTS (1u << 4) 573#define XFS_AGF_LEVELS (1u << 5) 574#define XFS_AGF_FLFIRST (1u << 6) 575#define XFS_AGF_FLLAST (1u << 7) 576#define XFS_AGF_FLCOUNT (1u << 8) 577#define XFS_AGF_FREEBLKS (1u << 9) 578#define XFS_AGF_LONGEST (1u << 10) 579#define XFS_AGF_BTREEBLKS (1u << 11) 580#define XFS_AGF_UUID (1u << 12) 581#define XFS_AGF_RMAP_BLOCKS (1u << 13) 582#define XFS_AGF_REFCOUNT_BLOCKS (1u << 14) 583#define XFS_AGF_REFCOUNT_ROOT (1u << 15) 584#define XFS_AGF_REFCOUNT_LEVEL (1u << 16) 585#define XFS_AGF_SPARE64 (1u << 17) 586#define XFS_AGF_NUM_BITS 18 587#define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1) 588 589#define XFS_AGF_FLAGS \ 590 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 591 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 592 { XFS_AGF_SEQNO, "SEQNO" }, \ 593 { XFS_AGF_LENGTH, "LENGTH" }, \ 594 { XFS_AGF_ROOTS, "ROOTS" }, \ 595 { XFS_AGF_LEVELS, "LEVELS" }, \ 596 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 597 { XFS_AGF_FLLAST, "FLLAST" }, \ 598 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 599 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 600 { XFS_AGF_LONGEST, "LONGEST" }, \ 601 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 602 { XFS_AGF_UUID, "UUID" }, \ 603 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 604 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 605 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 606 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 607 { XFS_AGF_SPARE64, "SPARE64" } 608 609/* disk block (xfs_daddr_t) in the AG */ 610#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 611#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 612 613/* 614 * Size of the unlinked inode hash table in the agi. 615 */ 616#define XFS_AGI_UNLINKED_BUCKETS 64 617 618typedef struct xfs_agi { 619 /* 620 * Common allocation group header information 621 */ 622 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 623 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 624 __be32 agi_seqno; /* sequence # starting from 0 */ 625 __be32 agi_length; /* size in blocks of a.g. */ 626 /* 627 * Inode information 628 * Inodes are mapped by interpreting the inode number, so no 629 * mapping data is needed here. 630 */ 631 __be32 agi_count; /* count of allocated inodes */ 632 __be32 agi_root; /* root of inode btree */ 633 __be32 agi_level; /* levels in inode btree */ 634 __be32 agi_freecount; /* number of free inodes */ 635 636 __be32 agi_newino; /* new inode just allocated */ 637 __be32 agi_dirino; /* last directory inode chunk */ 638 /* 639 * Hash table of inodes which have been unlinked but are 640 * still being referenced. 641 */ 642 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 643 /* 644 * This marks the end of logging region 1 and start of logging region 2. 645 */ 646 uuid_t agi_uuid; /* uuid of filesystem */ 647 __be32 agi_crc; /* crc of agi sector */ 648 __be32 agi_pad32; 649 __be64 agi_lsn; /* last write sequence */ 650 651 __be32 agi_free_root; /* root of the free inode btree */ 652 __be32 agi_free_level;/* levels in free inode btree */ 653 654 __be32 agi_iblocks; /* inobt blocks used */ 655 __be32 agi_fblocks; /* finobt blocks used */ 656 657 /* structure must be padded to 64 bit alignment */ 658} xfs_agi_t; 659 660#define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 661 662#define XFS_AGI_MAGICNUM (1u << 0) 663#define XFS_AGI_VERSIONNUM (1u << 1) 664#define XFS_AGI_SEQNO (1u << 2) 665#define XFS_AGI_LENGTH (1u << 3) 666#define XFS_AGI_COUNT (1u << 4) 667#define XFS_AGI_ROOT (1u << 5) 668#define XFS_AGI_LEVEL (1u << 6) 669#define XFS_AGI_FREECOUNT (1u << 7) 670#define XFS_AGI_NEWINO (1u << 8) 671#define XFS_AGI_DIRINO (1u << 9) 672#define XFS_AGI_UNLINKED (1u << 10) 673#define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 674#define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1) 675#define XFS_AGI_FREE_ROOT (1u << 11) 676#define XFS_AGI_FREE_LEVEL (1u << 12) 677#define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */ 678#define XFS_AGI_NUM_BITS_R2 14 679 680/* disk block (xfs_daddr_t) in the AG */ 681#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 682#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 683 684/* 685 * The third a.g. block contains the a.g. freelist, an array 686 * of block pointers to blocks owned by the allocation btree code. 687 */ 688#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 689#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 690#define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr)) 691 692struct xfs_agfl { 693 __be32 agfl_magicnum; 694 __be32 agfl_seqno; 695 uuid_t agfl_uuid; 696 __be64 agfl_lsn; 697 __be32 agfl_crc; 698} __attribute__((packed)); 699 700#define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 701 702#define XFS_AGB_TO_FSB(mp,agno,agbno) \ 703 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 704#define XFS_FSB_TO_AGNO(mp,fsbno) \ 705 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 706#define XFS_FSB_TO_AGBNO(mp,fsbno) \ 707 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 708#define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 709 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 710 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 711#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 712 713/* 714 * For checking for bad ranges of xfs_daddr_t's, covering multiple 715 * allocation groups or a single xfs_daddr_t that's a superblock copy. 716 */ 717#define XFS_AG_CHECK_DADDR(mp,d,len) \ 718 ((len) == 1 ? \ 719 ASSERT((d) == XFS_SB_DADDR || \ 720 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 721 ASSERT(xfs_daddr_to_agno(mp, d) == \ 722 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 723 724/* 725 * Realtime bitmap information is accessed by the word, which is currently 726 * stored in host-endian format. Starting with the realtime groups feature, 727 * the words are stored in be32 ondisk. 728 */ 729union xfs_rtword_raw { 730 __u32 old; 731 __be32 rtg; 732}; 733 734/* 735 * Realtime summary counts are accessed by the word, which is currently 736 * stored in host-endian format. Starting with the realtime groups feature, 737 * the words are stored in be32 ondisk. 738 */ 739union xfs_suminfo_raw { 740 __u32 old; 741 __be32 rtg; 742}; 743 744/* 745 * Realtime allocation groups break the rt section into multiple pieces that 746 * could be locked independently. Realtime block group numbers are 32-bit 747 * quantities. Block numbers within a group are also 32-bit quantities, but 748 * the upper bit must never be set. rtgroup 0 might have a superblock in it, 749 * so the minimum size of an rtgroup is 2 rtx. 750 */ 751#define XFS_MAX_RGBLOCKS ((xfs_rgblock_t)(1U << 31) - 1) 752#define XFS_MIN_RGEXTENTS ((xfs_rtxlen_t)2) 753#define XFS_MAX_RGNUMBER ((xfs_rgnumber_t)(-1U)) 754 755#define XFS_RTSB_MAGIC 0x46726F67 /* 'Frog' */ 756 757/* 758 * Realtime superblock - on disk version. Must be padded to 64 bit alignment. 759 * The first block of the realtime volume contains this superblock. 760 */ 761struct xfs_rtsb { 762 __be32 rsb_magicnum; /* magic number == XFS_RTSB_MAGIC */ 763 __le32 rsb_crc; /* superblock crc */ 764 765 __be32 rsb_pad; /* zero */ 766 unsigned char rsb_fname[XFSLABEL_MAX]; /* file system name */ 767 768 uuid_t rsb_uuid; /* user-visible file system unique id */ 769 uuid_t rsb_meta_uuid; /* metadata file system unique id */ 770 771 /* must be padded to 64 bit alignment */ 772}; 773 774#define XFS_RTSB_CRC_OFF offsetof(struct xfs_rtsb, rsb_crc) 775#define XFS_RTSB_DADDR ((xfs_daddr_t)0) /* daddr in rt section */ 776 777/* 778 * XFS Timestamps 779 * ============== 780 * 781 * Traditional ondisk inode timestamps consist of signed 32-bit counters for 782 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC 783 * 1970, which means that the timestamp epoch is the same as the Unix epoch. 784 * Therefore, the ondisk min and max defined here can be used directly to 785 * constrain the incore timestamps on a Unix system. Note that we actually 786 * encode a __be64 value on disk. 787 * 788 * When the bigtime feature is enabled, ondisk inode timestamps become an 789 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode 790 * timestamp epoch is the start of the classic timestamp range, which is 791 * Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers 792 * /must/ use the bigtime conversion functions when encoding and decoding raw 793 * timestamps. 794 */ 795typedef __be64 xfs_timestamp_t; 796 797/* Legacy timestamp encoding format. */ 798struct xfs_legacy_timestamp { 799 __be32 t_sec; /* timestamp seconds */ 800 __be32 t_nsec; /* timestamp nanoseconds */ 801}; 802 803/* 804 * Smallest possible ondisk seconds value with traditional timestamps. This 805 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901. 806 */ 807#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN) 808 809/* 810 * Largest possible ondisk seconds value with traditional timestamps. This 811 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038. 812 */ 813#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) 814 815/* 816 * Smallest possible ondisk seconds value with bigtime timestamps. This 817 * corresponds (after conversion to a Unix timestamp) with the traditional 818 * minimum timestamp of Dec 13 20:45:52 UTC 1901. 819 */ 820#define XFS_BIGTIME_TIME_MIN ((int64_t)0) 821 822/* 823 * Largest supported ondisk seconds value with bigtime timestamps. This 824 * corresponds (after conversion to a Unix timestamp) with an incore timestamp 825 * of Jul 2 20:20:24 UTC 2486. 826 * 827 * We round down the ondisk limit so that the bigtime quota and inode max 828 * timestamps will be the same. 829 */ 830#define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL)) 831 832/* 833 * Bigtime epoch is set exactly to the minimum time value that a traditional 834 * 32-bit timestamp can represent when using the Unix epoch as a reference. 835 * Hence the Unix epoch is at a fixed offset into the supported bigtime 836 * timestamp range. 837 * 838 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS 839 * timestamp can represent so we will not lose any fidelity in converting 840 * to/from unix and bigtime timestamps. 841 * 842 * The following conversion factor converts a seconds counter from the Unix 843 * epoch to the bigtime epoch. 844 */ 845#define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN) 846 847/* Convert a timestamp from the Unix epoch to the bigtime epoch. */ 848static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds) 849{ 850 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET; 851} 852 853/* Convert a timestamp from the bigtime epoch to the Unix epoch. */ 854static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds) 855{ 856 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET; 857} 858 859enum xfs_metafile_type { 860 XFS_METAFILE_UNKNOWN, /* unknown */ 861 XFS_METAFILE_DIR, /* metadir directory */ 862 XFS_METAFILE_USRQUOTA, /* user quota */ 863 XFS_METAFILE_GRPQUOTA, /* group quota */ 864 XFS_METAFILE_PRJQUOTA, /* project quota */ 865 XFS_METAFILE_RTBITMAP, /* rt bitmap */ 866 XFS_METAFILE_RTSUMMARY, /* rt summary */ 867 XFS_METAFILE_RTRMAP, /* rt rmap */ 868 XFS_METAFILE_RTREFCOUNT, /* rt refcount */ 869 870 XFS_METAFILE_MAX 871} __packed; 872 873#define XFS_METAFILE_TYPE_STR \ 874 { XFS_METAFILE_UNKNOWN, "unknown" }, \ 875 { XFS_METAFILE_DIR, "dir" }, \ 876 { XFS_METAFILE_USRQUOTA, "usrquota" }, \ 877 { XFS_METAFILE_GRPQUOTA, "grpquota" }, \ 878 { XFS_METAFILE_PRJQUOTA, "prjquota" }, \ 879 { XFS_METAFILE_RTBITMAP, "rtbitmap" }, \ 880 { XFS_METAFILE_RTSUMMARY, "rtsummary" }, \ 881 { XFS_METAFILE_RTRMAP, "rtrmap" }, \ 882 { XFS_METAFILE_RTREFCOUNT, "rtrefcount" } 883 884/* 885 * On-disk inode structure. 886 * 887 * This is just the header or "dinode core", the inode is expanded to fill a 888 * variable size the leftover area split into a data and an attribute fork. 889 * The format of the data and attribute fork depends on the format of the 890 * inode as indicated by di_format and di_aformat. To access the data and 891 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 892 * below. 893 * 894 * There is a very similar struct xfs_log_dinode which matches the layout of 895 * this structure, but is kept in native format instead of big endian. 896 * 897 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 898 * padding field for v3 inodes. 899 */ 900#define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 901struct xfs_dinode { 902 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 903 __be16 di_mode; /* mode and type of file */ 904 __u8 di_version; /* inode version */ 905 __u8 di_format; /* format of di_c data */ 906 __be16 di_metatype; /* XFS_METAFILE_*; was di_onlink */ 907 __be32 di_uid; /* owner's user id */ 908 __be32 di_gid; /* owner's group id */ 909 __be32 di_nlink; /* number of links to file */ 910 __be16 di_projid_lo; /* lower part of owner's project id */ 911 __be16 di_projid_hi; /* higher part owner's project id */ 912 union { 913 /* Number of data fork extents if NREXT64 is set */ 914 __be64 di_big_nextents; 915 916 /* Padding for V3 inodes without NREXT64 set. */ 917 __be64 di_v3_pad; 918 919 /* Padding and inode flush counter for V2 inodes. */ 920 struct { 921 __u8 di_v2_pad[6]; 922 __be16 di_flushiter; 923 }; 924 }; 925 xfs_timestamp_t di_atime; /* time last accessed */ 926 xfs_timestamp_t di_mtime; /* time last modified */ 927 xfs_timestamp_t di_ctime; /* time created/inode modified */ 928 __be64 di_size; /* number of bytes in file */ 929 __be64 di_nblocks; /* # of direct & btree blocks used */ 930 __be32 di_extsize; /* basic/minimum extent size for file */ 931 union { 932 /* 933 * For V2 inodes and V3 inodes without NREXT64 set, this 934 * is the number of data and attr fork extents. 935 */ 936 struct { 937 __be32 di_nextents; 938 __be16 di_anextents; 939 } __packed; 940 941 /* Number of attr fork extents if NREXT64 is set. */ 942 struct { 943 __be32 di_big_anextents; 944 __be16 di_nrext64_pad; 945 } __packed; 946 } __packed; 947 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 948 __s8 di_aformat; /* format of attr fork's data */ 949 __be32 di_dmevmask; /* DMIG event mask */ 950 __be16 di_dmstate; /* DMIG state info */ 951 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 952 __be32 di_gen; /* generation number */ 953 954 /* di_next_unlinked is the only non-core field in the old dinode */ 955 __be32 di_next_unlinked;/* agi unlinked list ptr */ 956 957 /* start of the extended dinode, writable fields */ 958 __le32 di_crc; /* CRC of the inode */ 959 __be64 di_changecount; /* number of attribute changes */ 960 __be64 di_lsn; /* flush sequence */ 961 __be64 di_flags2; /* more random flags */ 962 union { 963 /* basic cow extent size for (regular) file */ 964 __be32 di_cowextsize; 965 /* used blocks in RTG for (zoned) rtrmap inode */ 966 __be32 di_used_blocks; 967 }; 968 __u8 di_pad2[12]; /* more padding for future expansion */ 969 970 /* fields only written to during inode creation */ 971 xfs_timestamp_t di_crtime; /* time created */ 972 __be64 di_ino; /* inode number */ 973 uuid_t di_uuid; /* UUID of the filesystem */ 974 975 /* structure must be padded to 64 bit alignment */ 976}; 977 978#define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 979 980#define DI_MAX_FLUSH 0xffff 981 982/* 983 * Size of the core inode on disk. Version 1 and 2 inodes have 984 * the same size, but version 3 has grown a few additional fields. 985 */ 986static inline uint xfs_dinode_size(int version) 987{ 988 if (version == 3) 989 return sizeof(struct xfs_dinode); 990 return offsetof(struct xfs_dinode, di_crc); 991} 992 993/* 994 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 995 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 996 */ 997#define XFS_MAXLINK ((1U << 31) - 1U) 998 999/* 1000 * Any file that hits the maximum ondisk link count should be pinned to avoid 1001 * a use-after-free situation. 1002 */ 1003#define XFS_NLINK_PINNED (~0U) 1004 1005/* 1006 * Values for di_format 1007 * 1008 * This enum is used in string mapping in xfs_trace.h; please keep the 1009 * TRACE_DEFINE_ENUMs for it up to date. 1010 */ 1011enum xfs_dinode_fmt { 1012 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 1013 XFS_DINODE_FMT_LOCAL, /* bulk data */ 1014 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 1015 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 1016 XFS_DINODE_FMT_UUID, /* added long ago, but never used */ 1017 XFS_DINODE_FMT_META_BTREE, /* metadata btree */ 1018}; 1019 1020#define XFS_INODE_FORMAT_STR \ 1021 { XFS_DINODE_FMT_DEV, "dev" }, \ 1022 { XFS_DINODE_FMT_LOCAL, "local" }, \ 1023 { XFS_DINODE_FMT_EXTENTS, "extent" }, \ 1024 { XFS_DINODE_FMT_BTREE, "btree" }, \ 1025 { XFS_DINODE_FMT_UUID, "uuid" }, \ 1026 { XFS_DINODE_FMT_META_BTREE, "meta_btree" } 1027 1028/* 1029 * Max values for extnum and aextnum. 1030 * 1031 * The original on-disk extent counts were held in signed fields, resulting in 1032 * maximum extent counts of 2^31 and 2^15 for the data and attr forks 1033 * respectively. Similarly the maximum extent length is limited to 2^21 blocks 1034 * by the 21-bit wide blockcount field of a BMBT extent record. 1035 * 1036 * The newly introduced data fork extent counter can hold a 64-bit value, 1037 * however the maximum number of extents in a file is also limited to 2^54 1038 * extents by the 54-bit wide startoff field of a BMBT extent record. 1039 * 1040 * It is further limited by the maximum supported file size of 2^63 1041 * *bytes*. This leads to a maximum extent count for maximally sized filesystem 1042 * blocks (64kB) of: 1043 * 1044 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks 1045 * 1046 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence 1047 * 2^48 was chosen as the maximum data fork extent count. 1048 * 1049 * The maximum file size that can be represented by the data fork extent counter 1050 * in the worst case occurs when all extents are 1 block in length and each 1051 * block is 1KB in size. 1052 * 1053 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and 1054 * with 1KB sized blocks, a file can reach upto, 1055 * 1KB * (2^31) = 2TB 1056 * 1057 * This is much larger than the theoretical maximum size of a directory 1058 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB. 1059 * 1060 * Hence, a directory inode can never overflow its data fork extent counter. 1061 */ 1062#define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1)) 1063#define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1)) 1064#define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1)) 1065#define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1)) 1066 1067/* 1068 * When we upgrade an inode to the large extent counts, the maximum value by 1069 * which the extent count can increase is bound by the change in size of the 1070 * on-disk field. No upgrade operation should ever be adding more than a few 1071 * tens of extents, so if we get a really large value it is a sign of a code bug 1072 * or corruption. 1073 */ 1074#define XFS_MAX_EXTCNT_UPGRADE_NR \ 1075 min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \ 1076 XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL) 1077 1078/* 1079 * Inode minimum and maximum sizes. 1080 */ 1081#define XFS_DINODE_MIN_LOG 8 1082#define XFS_DINODE_MAX_LOG 11 1083#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 1084#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 1085 1086/* 1087 * Inode size for given fs. 1088 */ 1089#define XFS_DINODE_SIZE(mp) \ 1090 (xfs_has_v3inodes(mp) ? \ 1091 sizeof(struct xfs_dinode) : \ 1092 offsetof(struct xfs_dinode, di_crc)) 1093#define XFS_LITINO(mp) \ 1094 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp)) 1095 1096/* 1097 * Inode data & attribute fork sizes, per inode. 1098 */ 1099#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 1100 1101#define XFS_DFORK_DSIZE(dip,mp) \ 1102 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp)) 1103#define XFS_DFORK_ASIZE(dip,mp) \ 1104 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0) 1105#define XFS_DFORK_SIZE(dip,mp,w) \ 1106 ((w) == XFS_DATA_FORK ? \ 1107 XFS_DFORK_DSIZE(dip, mp) : \ 1108 XFS_DFORK_ASIZE(dip, mp)) 1109 1110#define XFS_DFORK_MAXEXT(dip, mp, w) \ 1111 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec)) 1112 1113/* 1114 * Return pointers to the data or attribute forks. 1115 */ 1116#define XFS_DFORK_DPTR(dip) \ 1117 ((void *)dip + xfs_dinode_size(dip->di_version)) 1118#define XFS_DFORK_APTR(dip) \ 1119 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 1120#define XFS_DFORK_PTR(dip,w) \ 1121 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 1122 1123#define XFS_DFORK_FORMAT(dip,w) \ 1124 ((w) == XFS_DATA_FORK ? \ 1125 (dip)->di_format : \ 1126 (dip)->di_aformat) 1127 1128/* 1129 * For block and character special files the 32bit dev_t is stored at the 1130 * beginning of the data fork. 1131 */ 1132static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1133{ 1134 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1135} 1136 1137static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1138{ 1139 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1140} 1141 1142/* 1143 * Values for di_flags 1144 */ 1145#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1146#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1147#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1148#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1149#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1150#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1151#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1152#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1153#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1154#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1155#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1156#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1157#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1158#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1159#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1160/* Do not use bit 15, di_flags is legacy and unchanging now */ 1161 1162#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1163#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1164#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1165#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1166#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1167#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1168#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1169#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1170#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1171#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1172#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1173#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1174#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1175#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1176#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1177 1178#define XFS_DIFLAG_ANY \ 1179 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1180 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1181 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1182 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1183 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1184 1185/* 1186 * Values for di_flags2 These start by being exposed to userspace in the upper 1187 * 16 bits of the XFS_XFLAG_s range. 1188 */ 1189/* use DAX for this inode */ 1190#define XFS_DIFLAG2_DAX_BIT 0 1191 1192/* file's blocks may be shared */ 1193#define XFS_DIFLAG2_REFLINK_BIT 1 1194 1195/* copy on write extent size hint */ 1196#define XFS_DIFLAG2_COWEXTSIZE_BIT 2 1197 1198/* big timestamps */ 1199#define XFS_DIFLAG2_BIGTIME_BIT 3 1200 1201/* large extent counters */ 1202#define XFS_DIFLAG2_NREXT64_BIT 4 1203 1204/* 1205 * The inode contains filesystem metadata and can be found through the metadata 1206 * directory tree. Metadata inodes must satisfy the following constraints: 1207 * 1208 * - V5 filesystem (and ftype) are enabled; 1209 * - The only valid modes are regular files and directories; 1210 * - The access bits must be zero; 1211 * - DMAPI event and state masks are zero; 1212 * - The user and group IDs must be zero; 1213 * - The project ID can be used as a u32 annotation; 1214 * - The immutable, sync, noatime, nodump, nodefrag flags must be set. 1215 * - The dax flag must not be set. 1216 * - Directories must have nosymlinks set. 1217 * 1218 * These requirements are chosen defensively to minimize the ability of 1219 * userspace to read or modify the contents, should a metadata file ever 1220 * escape to userspace. 1221 * 1222 * There are further constraints on the directory tree itself: 1223 * 1224 * - Metadata inodes must never be resolvable through the root directory; 1225 * - They must never be accessed by userspace; 1226 * - Metadata directory entries must have correct ftype. 1227 * 1228 * Superblock-rooted metadata files must have the METADATA iflag set even 1229 * though they do not have a parent directory. 1230 */ 1231#define XFS_DIFLAG2_METADATA_BIT 5 1232 1233#define XFS_DIFLAG2_DAX (1ULL << XFS_DIFLAG2_DAX_BIT) 1234#define XFS_DIFLAG2_REFLINK (1ULL << XFS_DIFLAG2_REFLINK_BIT) 1235#define XFS_DIFLAG2_COWEXTSIZE (1ULL << XFS_DIFLAG2_COWEXTSIZE_BIT) 1236#define XFS_DIFLAG2_BIGTIME (1ULL << XFS_DIFLAG2_BIGTIME_BIT) 1237#define XFS_DIFLAG2_NREXT64 (1ULL << XFS_DIFLAG2_NREXT64_BIT) 1238#define XFS_DIFLAG2_METADATA (1ULL << XFS_DIFLAG2_METADATA_BIT) 1239 1240#define XFS_DIFLAG2_ANY \ 1241 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ 1242 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | XFS_DIFLAG2_METADATA) 1243 1244static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) 1245{ 1246 return dip->di_version >= 3 && 1247 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME)); 1248} 1249 1250static inline bool xfs_dinode_has_large_extent_counts( 1251 const struct xfs_dinode *dip) 1252{ 1253 return dip->di_version >= 3 && 1254 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64)); 1255} 1256 1257static inline bool xfs_dinode_is_metadir(const struct xfs_dinode *dip) 1258{ 1259 return dip->di_version >= 3 && 1260 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_METADATA)); 1261} 1262 1263/* 1264 * Inode number format: 1265 * low inopblog bits - offset in block 1266 * next agblklog bits - block number in ag 1267 * next agno_log bits - ag number 1268 * high agno_log-agblklog-inopblog bits - 0 1269 */ 1270#define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1) 1271#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1272#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1273#define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log) 1274#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1275#define XFS_INO_BITS(mp) \ 1276 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1277#define XFS_INO_TO_AGNO(mp,i) \ 1278 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1279#define XFS_INO_TO_AGINO(mp,i) \ 1280 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1281#define XFS_INO_TO_AGBNO(mp,i) \ 1282 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1283 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1284#define XFS_INO_TO_OFFSET(mp,i) \ 1285 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1286#define XFS_INO_TO_FSB(mp,i) \ 1287 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1288#define XFS_AGINO_TO_INO(mp,a,i) \ 1289 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1290#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1291#define XFS_AGINO_TO_OFFSET(mp,i) \ 1292 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1293#define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1294 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1295#define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1296#define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1297 1298#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1299#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1300 1301/* 1302 * RealTime Device format definitions 1303 */ 1304 1305/* Min and max rt extent sizes, specified in bytes */ 1306#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1307#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1308#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1309 1310/* 1311 * RT bit manipulation macros. 1312 */ 1313#define XFS_RTBITMAP_MAGIC 0x424D505A /* BMPZ */ 1314#define XFS_RTSUMMARY_MAGIC 0x53554D59 /* SUMY */ 1315 1316struct xfs_rtbuf_blkinfo { 1317 __be32 rt_magic; /* validity check on block */ 1318 __be32 rt_crc; /* CRC of block */ 1319 __be64 rt_owner; /* inode that owns the block */ 1320 __be64 rt_blkno; /* first block of the buffer */ 1321 __be64 rt_lsn; /* sequence number of last write */ 1322 uuid_t rt_uuid; /* filesystem we belong to */ 1323}; 1324 1325#define XFS_RTBUF_CRC_OFF \ 1326 offsetof(struct xfs_rtbuf_blkinfo, rt_crc) 1327 1328/* 1329 * Dquot and dquot block format definitions 1330 */ 1331#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1332#define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */ 1333 1334#define XFS_DQTYPE_USER (1u << 0) /* user dquot record */ 1335#define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */ 1336#define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */ 1337#define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */ 1338 1339/* bitmask to determine if this is a user/group/project dquot */ 1340#define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \ 1341 XFS_DQTYPE_PROJ | \ 1342 XFS_DQTYPE_GROUP) 1343 1344#define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \ 1345 XFS_DQTYPE_BIGTIME) 1346 1347/* 1348 * XFS Quota Timers 1349 * ================ 1350 * 1351 * Traditional quota grace period expiration timers are an unsigned 32-bit 1352 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970. 1353 * Note that an expiration value of zero means that the quota limit has not 1354 * been reached, and therefore no expiration has been set. Therefore, the 1355 * ondisk min and max defined here can be used directly to constrain the incore 1356 * quota expiration timestamps on a Unix system. 1357 * 1358 * When bigtime is enabled, we trade two bits of precision to expand the 1359 * expiration timeout range to match that of big inode timestamps. The min and 1360 * max recorded here are the on-disk limits, not a Unix timestamp. 1361 * 1362 * The grace period for each quota type is stored in the root dquot (id = 0) 1363 * and is applied to a non-root dquot when it exceeds the soft or hard limits. 1364 * The length of quota grace periods are unsigned 32-bit quantities measured in 1365 * units of seconds. A value of zero means to use the default period. 1366 */ 1367 1368/* 1369 * Smallest possible ondisk quota expiration value with traditional timestamps. 1370 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970. 1371 */ 1372#define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1) 1373 1374/* 1375 * Largest possible ondisk quota expiration value with traditional timestamps. 1376 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106. 1377 */ 1378#define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX) 1379 1380/* 1381 * Smallest possible ondisk quota expiration value with bigtime timestamps. 1382 * This corresponds (after conversion to a Unix timestamp) with the incore 1383 * expiration of Jan 1 00:00:04 UTC 1970. 1384 */ 1385#define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN) 1386 1387/* 1388 * Largest supported ondisk quota expiration value with bigtime timestamps. 1389 * This corresponds (after conversion to a Unix timestamp) with an incore 1390 * expiration of Jul 2 20:20:24 UTC 2486. 1391 * 1392 * The ondisk field supports values up to -1U, which corresponds to an incore 1393 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp, 1394 * so we cap the maximum bigtime quota expiration to the max inode timestamp. 1395 */ 1396#define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U) 1397 1398/* 1399 * The following conversion factors assist in converting a quota expiration 1400 * timestamp between the incore and ondisk formats. 1401 */ 1402#define XFS_DQ_BIGTIME_SHIFT (2) 1403#define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1) 1404 1405/* Convert an incore quota expiration timestamp to an ondisk bigtime value. */ 1406static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds) 1407{ 1408 /* 1409 * Round the expiration timestamp up to the nearest bigtime timestamp 1410 * that we can store, to give users the most time to fix problems. 1411 */ 1412 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >> 1413 XFS_DQ_BIGTIME_SHIFT; 1414} 1415 1416/* Convert an ondisk bigtime quota expiration value to an incore timestamp. */ 1417static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds) 1418{ 1419 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT; 1420} 1421 1422/* 1423 * Default quota grace periods, ranging from zero (use the compiled defaults) 1424 * to ~136 years. These are applied to a non-root dquot that has exceeded 1425 * either limit. 1426 */ 1427#define XFS_DQ_GRACE_MIN ((int64_t)0) 1428#define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX) 1429 1430/* Maximum id value for a quota record */ 1431#define XFS_DQ_ID_MAX (U32_MAX) 1432 1433/* 1434 * This is the main portion of the on-disk representation of quota information 1435 * for a user. We pad this with some more expansion room to construct the on 1436 * disk structure. 1437 */ 1438struct xfs_disk_dquot { 1439 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1440 __u8 d_version; /* dquot version */ 1441 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */ 1442 __be32 d_id; /* user,project,group id */ 1443 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1444 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1445 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1446 __be64 d_ino_softlimit;/* preferred inode limit */ 1447 __be64 d_bcount; /* disk blocks owned by the user */ 1448 __be64 d_icount; /* inodes owned by the user */ 1449 __be32 d_itimer; /* zero if within inode limits if not, 1450 this is when we refuse service */ 1451 __be32 d_btimer; /* similar to above; for disk blocks */ 1452 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1453 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1454 __be32 d_pad0; /* 64 bit align */ 1455 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1456 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1457 __be64 d_rtbcount; /* realtime blocks owned */ 1458 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1459 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1460 __be16 d_pad; 1461}; 1462 1463/* 1464 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1465 * carrying the unnecessary padding would be a waste of memory. 1466 */ 1467struct xfs_dqblk { 1468 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */ 1469 char dd_fill[4];/* filling for posterity */ 1470 1471 /* 1472 * These two are only present on filesystems with the CRC bits set. 1473 */ 1474 __be32 dd_crc; /* checksum */ 1475 __be64 dd_lsn; /* last modification in log */ 1476 uuid_t dd_uuid; /* location information */ 1477}; 1478 1479#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1480 1481/* 1482 * This defines the unit of allocation of dquots. 1483 * 1484 * Currently, it is just one file system block, and a 4K blk contains 30 1485 * (136 * 30 = 4080) dquots. It's probably not worth trying to make 1486 * this more dynamic. 1487 * 1488 * However, if this number is changed, we have to make sure that we don't 1489 * implicitly assume that we do allocations in chunks of a single filesystem 1490 * block in the dquot/xqm code. 1491 * 1492 * This is part of the ondisk format because the structure size is not a power 1493 * of two, which leaves slack at the end of the disk block. 1494 */ 1495#define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1 1496 1497/* 1498 * Remote symlink format and access functions. 1499 */ 1500#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1501 1502struct xfs_dsymlink_hdr { 1503 __be32 sl_magic; 1504 __be32 sl_offset; 1505 __be32 sl_bytes; 1506 __be32 sl_crc; 1507 uuid_t sl_uuid; 1508 __be64 sl_owner; 1509 __be64 sl_blkno; 1510 __be64 sl_lsn; 1511}; 1512 1513#define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1514 1515#define XFS_SYMLINK_MAXLEN 1024 1516/* 1517 * The maximum pathlen is 1024 bytes. Since the minimum file system 1518 * blocksize is 512 bytes, we can get a max of 3 extents back from 1519 * bmapi when crc headers are taken into account. 1520 */ 1521#define XFS_SYMLINK_MAPS 3 1522 1523#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1524 ((bufsize) - (xfs_has_crc((mp)) ? \ 1525 sizeof(struct xfs_dsymlink_hdr) : 0)) 1526 1527 1528/* 1529 * Allocation Btree format definitions 1530 * 1531 * There are two on-disk btrees, one sorted by blockno and one sorted 1532 * by blockcount and blockno. All blocks look the same to make the code 1533 * simpler; if we have time later, we'll make the optimizations. 1534 */ 1535#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1536#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1537#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1538#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1539 1540/* 1541 * Data record/key structure 1542 */ 1543typedef struct xfs_alloc_rec { 1544 __be32 ar_startblock; /* starting block number */ 1545 __be32 ar_blockcount; /* count of free blocks */ 1546} xfs_alloc_rec_t, xfs_alloc_key_t; 1547 1548typedef struct xfs_alloc_rec_incore { 1549 xfs_agblock_t ar_startblock; /* starting block number */ 1550 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1551} xfs_alloc_rec_incore_t; 1552 1553/* btree pointer type */ 1554typedef __be32 xfs_alloc_ptr_t; 1555 1556/* 1557 * Block numbers in the AG: 1558 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1559 */ 1560#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1561#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1562 1563 1564/* 1565 * Inode Allocation Btree format definitions 1566 * 1567 * There is a btree for the inode map per allocation group. 1568 */ 1569#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1570#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1571#define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1572#define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1573 1574typedef uint64_t xfs_inofree_t; 1575#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1576#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1577#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1578#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1579 1580#define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1581#define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t)) 1582#define XFS_INODES_PER_HOLEMASK_BIT \ 1583 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t))) 1584 1585static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1586{ 1587 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1588} 1589 1590/* 1591 * The on-disk inode record structure has two formats. The original "full" 1592 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1593 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1594 * count. 1595 * 1596 * The holemask of the sparse record format allows an inode chunk to have holes 1597 * that refer to blocks not owned by the inode record. This facilitates inode 1598 * allocation in the event of severe free space fragmentation. 1599 */ 1600typedef struct xfs_inobt_rec { 1601 __be32 ir_startino; /* starting inode number */ 1602 union { 1603 struct { 1604 __be32 ir_freecount; /* count of free inodes */ 1605 } f; 1606 struct { 1607 __be16 ir_holemask;/* hole mask for sparse chunks */ 1608 __u8 ir_count; /* total inode count */ 1609 __u8 ir_freecount; /* count of free inodes */ 1610 } sp; 1611 } ir_u; 1612 __be64 ir_free; /* free inode mask */ 1613} xfs_inobt_rec_t; 1614 1615typedef struct xfs_inobt_rec_incore { 1616 xfs_agino_t ir_startino; /* starting inode number */ 1617 uint16_t ir_holemask; /* hole mask for sparse chunks */ 1618 uint8_t ir_count; /* total inode count */ 1619 uint8_t ir_freecount; /* count of free inodes (set bits) */ 1620 xfs_inofree_t ir_free; /* free inode mask */ 1621} xfs_inobt_rec_incore_t; 1622 1623static inline bool xfs_inobt_issparse(uint16_t holemask) 1624{ 1625 /* non-zero holemask represents a sparse rec. */ 1626 return holemask; 1627} 1628 1629/* 1630 * Key structure 1631 */ 1632typedef struct xfs_inobt_key { 1633 __be32 ir_startino; /* starting inode number */ 1634} xfs_inobt_key_t; 1635 1636/* btree pointer type */ 1637typedef __be32 xfs_inobt_ptr_t; 1638 1639/* 1640 * block numbers in the AG. 1641 */ 1642#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1643#define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1644 1645/* 1646 * Reverse mapping btree format definitions 1647 * 1648 * There is a btree for the reverse map per allocation group 1649 */ 1650#define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1651 1652/* 1653 * Ownership info for an extent. This is used to create reverse-mapping 1654 * entries. 1655 */ 1656#define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1657#define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1658struct xfs_owner_info { 1659 uint64_t oi_owner; 1660 xfs_fileoff_t oi_offset; 1661 unsigned int oi_flags; 1662}; 1663 1664/* 1665 * Special owner types. 1666 * 1667 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1668 * to tell us we have a special owner value. We use these for static metadata 1669 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1670 */ 1671#define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1672#define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1673#define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1674#define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1675#define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1676#define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1677#define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1678#define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1679#define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1680#define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1681 1682#define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1683 1684/* 1685 * Data record structure 1686 */ 1687struct xfs_rmap_rec { 1688 __be32 rm_startblock; /* extent start block */ 1689 __be32 rm_blockcount; /* extent length */ 1690 __be64 rm_owner; /* extent owner */ 1691 __be64 rm_offset; /* offset within the owner */ 1692}; 1693 1694/* 1695 * rmap btree record 1696 * rm_offset:63 is the attribute fork flag 1697 * rm_offset:62 is the bmbt block flag 1698 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1699 * rm_offset:54-60 aren't used and should be zero 1700 * rm_offset:0-53 is the block offset within the inode 1701 */ 1702#define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63) 1703#define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62) 1704#define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61) 1705 1706#define XFS_RMAP_LEN_MAX ((uint32_t)~0U) 1707#define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1708 XFS_RMAP_OFF_BMBT_BLOCK | \ 1709 XFS_RMAP_OFF_UNWRITTEN) 1710#define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL) 1711 1712#define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1713 1714#define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1715#define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1716#define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1717 1718#define RMAPBT_STARTBLOCK_BITLEN 32 1719#define RMAPBT_BLOCKCOUNT_BITLEN 32 1720#define RMAPBT_OWNER_BITLEN 64 1721#define RMAPBT_ATTRFLAG_BITLEN 1 1722#define RMAPBT_BMBTFLAG_BITLEN 1 1723#define RMAPBT_EXNTFLAG_BITLEN 1 1724#define RMAPBT_UNUSED_OFFSET_BITLEN 7 1725#define RMAPBT_OFFSET_BITLEN 54 1726 1727/* 1728 * Key structure 1729 * 1730 * We don't use the length for lookups 1731 */ 1732struct xfs_rmap_key { 1733 __be32 rm_startblock; /* extent start block */ 1734 __be64 rm_owner; /* extent owner */ 1735 __be64 rm_offset; /* offset within the owner */ 1736} __attribute__((packed)); 1737 1738/* btree pointer type */ 1739typedef __be32 xfs_rmap_ptr_t; 1740 1741#define XFS_RMAP_BLOCK(mp) \ 1742 (xfs_has_finobt(((mp))) ? \ 1743 XFS_FIBT_BLOCK(mp) + 1 : \ 1744 XFS_IBT_BLOCK(mp) + 1) 1745 1746/* 1747 * Realtime Reverse mapping btree format definitions 1748 * 1749 * This is a btree for reverse mapping records for realtime volumes 1750 */ 1751#define XFS_RTRMAP_CRC_MAGIC 0x4d415052 /* 'MAPR' */ 1752 1753/* 1754 * rtrmap root header, on-disk form only. 1755 */ 1756struct xfs_rtrmap_root { 1757 __be16 bb_level; /* 0 is a leaf */ 1758 __be16 bb_numrecs; /* current # of data records */ 1759}; 1760 1761/* inode-based btree pointer type */ 1762typedef __be64 xfs_rtrmap_ptr_t; 1763 1764/* 1765 * Reference Count Btree format definitions 1766 * 1767 */ 1768#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1769 1770unsigned int xfs_refc_block(struct xfs_mount *mp); 1771 1772/* 1773 * Data record/key structure 1774 * 1775 * Each record associates a range of physical blocks (starting at 1776 * rc_startblock and ending rc_blockcount blocks later) with a reference 1777 * count (rc_refcount). Extents that are being used to stage a copy on 1778 * write (CoW) operation are recorded in the refcount btree with a 1779 * refcount of 1. All other records must have a refcount > 1 and must 1780 * track an extent mapped only by file data forks. 1781 * 1782 * Extents with a single owner (attributes, metadata, non-shared file 1783 * data) are not tracked here. Free space is also not tracked here. 1784 * This is consistent with pre-reflink XFS. 1785 */ 1786 1787/* 1788 * Extents that are being used to stage a copy on write are stored 1789 * in the refcount btree with a refcount of 1 and the upper bit set 1790 * on the startblock. This speeds up mount time deletion of stale 1791 * staging extents because they're all at the right side of the tree. 1792 */ 1793#define XFS_REFC_COWFLAG (1U << 31) 1794#define REFCNTBT_COWFLAG_BITLEN 1 1795#define REFCNTBT_AGBLOCK_BITLEN 31 1796 1797struct xfs_refcount_rec { 1798 __be32 rc_startblock; /* starting block number */ 1799 __be32 rc_blockcount; /* count of blocks */ 1800 __be32 rc_refcount; /* number of inodes linked here */ 1801}; 1802 1803struct xfs_refcount_key { 1804 __be32 rc_startblock; /* starting block number */ 1805}; 1806 1807#define XFS_REFC_REFCOUNT_MAX ((xfs_nlink_t)~0U) 1808#define XFS_REFC_LEN_MAX ((xfs_extlen_t)~0U) 1809 1810/* btree pointer type */ 1811typedef __be32 xfs_refcount_ptr_t; 1812 1813/* 1814 * Realtime Reference Count btree format definitions 1815 * 1816 * This is a btree for reference count records for realtime volumes 1817 */ 1818#define XFS_RTREFC_CRC_MAGIC 0x52434e54 /* 'RCNT' */ 1819 1820/* 1821 * rt refcount root header, on-disk form only. 1822 */ 1823struct xfs_rtrefcount_root { 1824 __be16 bb_level; /* 0 is a leaf */ 1825 __be16 bb_numrecs; /* current # of data records */ 1826}; 1827 1828/* inode-rooted btree pointer type */ 1829typedef __be64 xfs_rtrefcount_ptr_t; 1830 1831/* 1832 * BMAP Btree format definitions 1833 * 1834 * This includes both the root block definition that sits inside an inode fork 1835 * and the record/pointer formats for the leaf/node in the blocks. 1836 */ 1837#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1838#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1839 1840/* 1841 * Bmap root header, on-disk form only. 1842 */ 1843typedef struct xfs_bmdr_block { 1844 __be16 bb_level; /* 0 is a leaf */ 1845 __be16 bb_numrecs; /* current # of data records */ 1846} xfs_bmdr_block_t; 1847 1848/* 1849 * Bmap btree record and extent descriptor. 1850 * l0:63 is an extent flag (value 1 indicates non-normal). 1851 * l0:9-62 are startoff. 1852 * l0:0-8 and l1:21-63 are startblock. 1853 * l1:0-20 are blockcount. 1854 */ 1855#define BMBT_EXNTFLAG_BITLEN 1 1856#define BMBT_STARTOFF_BITLEN 54 1857#define BMBT_STARTBLOCK_BITLEN 52 1858#define BMBT_BLOCKCOUNT_BITLEN 21 1859 1860#define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1) 1861#define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1) 1862 1863#define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK)) 1864 1865/* 1866 * bmbt records have a file offset (block) field that is 54 bits wide, so this 1867 * is the largest xfs_fileoff_t that we ever expect to see. 1868 */ 1869#define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK) 1870 1871typedef struct xfs_bmbt_rec { 1872 __be64 l0, l1; 1873} xfs_bmbt_rec_t; 1874 1875typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1876typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1877 1878/* 1879 * Values and macros for delayed-allocation startblock fields. 1880 */ 1881#define STARTBLOCKVALBITS 17 1882#define STARTBLOCKMASKBITS (15 + 20) 1883#define STARTBLOCKMASK \ 1884 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1885 1886static inline int isnullstartblock(xfs_fsblock_t x) 1887{ 1888 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1889} 1890 1891static inline xfs_fsblock_t nullstartblock(int k) 1892{ 1893 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1894 return STARTBLOCKMASK | (k); 1895} 1896 1897static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1898{ 1899 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1900} 1901 1902/* 1903 * Key structure for non-leaf levels of the tree. 1904 */ 1905typedef struct xfs_bmbt_key { 1906 __be64 br_startoff; /* starting file offset */ 1907} xfs_bmbt_key_t, xfs_bmdr_key_t; 1908 1909/* btree pointer type */ 1910typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1911 1912 1913/* 1914 * Generic Btree block format definitions 1915 * 1916 * This is a combination of the actual format used on disk for short and long 1917 * format btrees. The first three fields are shared by both format, but the 1918 * pointers are different and should be used with care. 1919 * 1920 * To get the size of the actual short or long form headers please use the size 1921 * macros below. Never use sizeof(xfs_btree_block). 1922 * 1923 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1924 * with the crc feature bit, and all accesses to them must be conditional on 1925 * that flag. 1926 */ 1927/* short form block header */ 1928struct xfs_btree_block_shdr { 1929 __be32 bb_leftsib; 1930 __be32 bb_rightsib; 1931 1932 __be64 bb_blkno; 1933 __be64 bb_lsn; 1934 uuid_t bb_uuid; 1935 __be32 bb_owner; 1936 __le32 bb_crc; 1937}; 1938 1939/* long form block header */ 1940struct xfs_btree_block_lhdr { 1941 __be64 bb_leftsib; 1942 __be64 bb_rightsib; 1943 1944 __be64 bb_blkno; 1945 __be64 bb_lsn; 1946 uuid_t bb_uuid; 1947 __be64 bb_owner; 1948 __le32 bb_crc; 1949 __be32 bb_pad; /* padding for alignment */ 1950}; 1951 1952struct xfs_btree_block { 1953 __be32 bb_magic; /* magic number for block type */ 1954 __be16 bb_level; /* 0 is a leaf */ 1955 __be16 bb_numrecs; /* current # of data records */ 1956 union { 1957 struct xfs_btree_block_shdr s; 1958 struct xfs_btree_block_lhdr l; 1959 } bb_u; /* rest */ 1960}; 1961 1962/* size of a short form block */ 1963#define XFS_BTREE_SBLOCK_LEN \ 1964 (offsetof(struct xfs_btree_block, bb_u) + \ 1965 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1966/* size of a long form block */ 1967#define XFS_BTREE_LBLOCK_LEN \ 1968 (offsetof(struct xfs_btree_block, bb_u) + \ 1969 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1970 1971/* sizes of CRC enabled btree blocks */ 1972#define XFS_BTREE_SBLOCK_CRC_LEN \ 1973 (offsetof(struct xfs_btree_block, bb_u) + \ 1974 sizeof(struct xfs_btree_block_shdr)) 1975#define XFS_BTREE_LBLOCK_CRC_LEN \ 1976 (offsetof(struct xfs_btree_block, bb_u) + \ 1977 sizeof(struct xfs_btree_block_lhdr)) 1978 1979#define XFS_BTREE_SBLOCK_CRC_OFF \ 1980 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1981#define XFS_BTREE_LBLOCK_CRC_OFF \ 1982 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1983 1984/* 1985 * On-disk XFS access control list structure. 1986 */ 1987struct xfs_acl_entry { 1988 __be32 ae_tag; 1989 __be32 ae_id; 1990 __be16 ae_perm; 1991 __be16 ae_pad; /* fill the implicit hole in the structure */ 1992}; 1993 1994struct xfs_acl { 1995 __be32 acl_cnt; 1996 struct xfs_acl_entry acl_entry[]; 1997}; 1998 1999/* 2000 * The number of ACL entries allowed is defined by the on-disk format. 2001 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 2002 * limited only by the maximum size of the xattr that stores the information. 2003 */ 2004#define XFS_ACL_MAX_ENTRIES(mp) \ 2005 (xfs_has_crc(mp) \ 2006 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 2007 sizeof(struct xfs_acl_entry) \ 2008 : 25) 2009 2010#define XFS_ACL_SIZE(cnt) \ 2011 (sizeof(struct xfs_acl) + \ 2012 sizeof(struct xfs_acl_entry) * cnt) 2013 2014#define XFS_ACL_MAX_SIZE(mp) \ 2015 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 2016 2017 2018/* On-disk XFS extended attribute names */ 2019#define SGI_ACL_FILE "SGI_ACL_FILE" 2020#define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 2021#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 2022#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 2023 2024#endif /* __XFS_FORMAT_H__ */
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