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 match the ondisk version below. 94 * Must be padded to 64 bit alignment. 95 */ 96 typedef struct xfs_sb { 97 uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 98 uint32_t sb_blocksize; /* logical block size, bytes */ 99 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 100 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 101 xfs_rtblock_t sb_rextents; /* number of realtime extents */ 102 uuid_t sb_uuid; /* user-visible file system unique id */ 103 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 104 xfs_ino_t sb_rootino; /* root inode number */ 105 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 106 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 107 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 108 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 109 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 110 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 111 xfs_extlen_t sb_logblocks; /* number of log blocks */ 112 uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 113 uint16_t sb_sectsize; /* volume sector size, bytes */ 114 uint16_t sb_inodesize; /* inode size, bytes */ 115 uint16_t sb_inopblock; /* inodes per block */ 116 char sb_fname[XFSLABEL_MAX]; /* file system name */ 117 uint8_t sb_blocklog; /* log2 of sb_blocksize */ 118 uint8_t sb_sectlog; /* log2 of sb_sectsize */ 119 uint8_t sb_inodelog; /* log2 of sb_inodesize */ 120 uint8_t sb_inopblog; /* log2 of sb_inopblock */ 121 uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 122 uint8_t sb_rextslog; /* log2 of sb_rextents */ 123 uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 124 uint8_t sb_imax_pct; /* max % of fs for inode space */ 125 /* statistics */ 126 /* 127 * These fields must remain contiguous. If you really 128 * want to change their layout, make sure you fix the 129 * code in xfs_trans_apply_sb_deltas(). 130 */ 131 uint64_t sb_icount; /* allocated inodes */ 132 uint64_t sb_ifree; /* free inodes */ 133 uint64_t sb_fdblocks; /* free data blocks */ 134 uint64_t sb_frextents; /* free realtime extents */ 135 /* 136 * End contiguous fields. 137 */ 138 xfs_ino_t sb_uquotino; /* user quota inode */ 139 xfs_ino_t sb_gquotino; /* group quota inode */ 140 uint16_t sb_qflags; /* quota flags */ 141 uint8_t sb_flags; /* misc. flags */ 142 uint8_t sb_shared_vn; /* shared version number */ 143 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 144 uint32_t sb_unit; /* stripe or raid unit */ 145 uint32_t sb_width; /* stripe or raid width */ 146 uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 147 uint8_t sb_logsectlog; /* log2 of the log sector size */ 148 uint16_t sb_logsectsize; /* sector size for the log, bytes */ 149 uint32_t sb_logsunit; /* stripe unit size for the log */ 150 uint32_t sb_features2; /* additional feature bits */ 151 152 /* 153 * bad features2 field as a result of failing to pad the sb structure to 154 * 64 bits. Some machines will be using this field for features2 bits. 155 * Easiest just to mark it bad and not use it for anything else. 156 * 157 * This is not kept up to date in memory; it is always overwritten by 158 * the value in sb_features2 when formatting the incore superblock to 159 * the disk buffer. 160 */ 161 uint32_t sb_bad_features2; 162 163 /* version 5 superblock fields start here */ 164 165 /* feature masks */ 166 uint32_t sb_features_compat; 167 uint32_t sb_features_ro_compat; 168 uint32_t sb_features_incompat; 169 uint32_t sb_features_log_incompat; 170 171 uint32_t sb_crc; /* superblock crc */ 172 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ 173 174 xfs_ino_t sb_pquotino; /* project quota inode */ 175 xfs_lsn_t sb_lsn; /* last write sequence */ 176 uuid_t sb_meta_uuid; /* metadata file system unique id */ 177 178 /* must be padded to 64 bit alignment */ 179 } xfs_sb_t; 180 181 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) 182 183 /* 184 * Superblock - on disk version. Must match the in core version above. 185 * Must be padded to 64 bit alignment. 186 */ 187 struct xfs_dsb { 188 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 189 __be32 sb_blocksize; /* logical block size, bytes */ 190 __be64 sb_dblocks; /* number of data blocks */ 191 __be64 sb_rblocks; /* number of realtime blocks */ 192 __be64 sb_rextents; /* number of realtime extents */ 193 uuid_t sb_uuid; /* user-visible file system unique id */ 194 __be64 sb_logstart; /* starting block of log if internal */ 195 __be64 sb_rootino; /* root inode number */ 196 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 197 __be64 sb_rsumino; /* summary inode for rt bitmap */ 198 __be32 sb_rextsize; /* realtime extent size, blocks */ 199 __be32 sb_agblocks; /* size of an allocation group */ 200 __be32 sb_agcount; /* number of allocation groups */ 201 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 202 __be32 sb_logblocks; /* number of log blocks */ 203 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 204 __be16 sb_sectsize; /* volume sector size, bytes */ 205 __be16 sb_inodesize; /* inode size, bytes */ 206 __be16 sb_inopblock; /* inodes per block */ 207 char sb_fname[XFSLABEL_MAX]; /* file system name */ 208 __u8 sb_blocklog; /* log2 of sb_blocksize */ 209 __u8 sb_sectlog; /* log2 of sb_sectsize */ 210 __u8 sb_inodelog; /* log2 of sb_inodesize */ 211 __u8 sb_inopblog; /* log2 of sb_inopblock */ 212 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 213 __u8 sb_rextslog; /* log2 of sb_rextents */ 214 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 215 __u8 sb_imax_pct; /* max % of fs for inode space */ 216 /* statistics */ 217 /* 218 * These fields must remain contiguous. If you really 219 * want to change their layout, make sure you fix the 220 * code in xfs_trans_apply_sb_deltas(). 221 */ 222 __be64 sb_icount; /* allocated inodes */ 223 __be64 sb_ifree; /* free inodes */ 224 __be64 sb_fdblocks; /* free data blocks */ 225 __be64 sb_frextents; /* free realtime extents */ 226 /* 227 * End contiguous fields. 228 */ 229 __be64 sb_uquotino; /* user quota inode */ 230 __be64 sb_gquotino; /* group quota inode */ 231 __be16 sb_qflags; /* quota flags */ 232 __u8 sb_flags; /* misc. flags */ 233 __u8 sb_shared_vn; /* shared version number */ 234 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 235 __be32 sb_unit; /* stripe or raid unit */ 236 __be32 sb_width; /* stripe or raid width */ 237 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 238 __u8 sb_logsectlog; /* log2 of the log sector size */ 239 __be16 sb_logsectsize; /* sector size for the log, bytes */ 240 __be32 sb_logsunit; /* stripe unit size for the log */ 241 __be32 sb_features2; /* additional feature bits */ 242 /* 243 * bad features2 field as a result of failing to pad the sb 244 * structure to 64 bits. Some machines will be using this field 245 * for features2 bits. Easiest just to mark it bad and not use 246 * it for anything else. 247 */ 248 __be32 sb_bad_features2; 249 250 /* version 5 superblock fields start here */ 251 252 /* feature masks */ 253 __be32 sb_features_compat; 254 __be32 sb_features_ro_compat; 255 __be32 sb_features_incompat; 256 __be32 sb_features_log_incompat; 257 258 __le32 sb_crc; /* superblock crc */ 259 __be32 sb_spino_align; /* sparse inode chunk alignment */ 260 261 __be64 sb_pquotino; /* project quota inode */ 262 __be64 sb_lsn; /* last write sequence */ 263 uuid_t sb_meta_uuid; /* metadata file system unique id */ 264 265 /* must be padded to 64 bit alignment */ 266 }; 267 268 /* 269 * Misc. Flags - warning - these will be cleared by xfs_repair unless 270 * a feature bit is set when the flag is used. 271 */ 272 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 273 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 274 275 /* 276 * define max. shared version we can interoperate with 277 */ 278 #define XFS_SB_MAX_SHARED_VN 0 279 280 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 281 282 static inline bool xfs_sb_is_v5(struct xfs_sb *sbp) 283 { 284 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 285 } 286 287 /* 288 * Detect a mismatched features2 field. Older kernels read/wrote 289 * this into the wrong slot, so to be safe we keep them in sync. 290 */ 291 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 292 { 293 return sbp->sb_bad_features2 != sbp->sb_features2; 294 } 295 296 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 297 { 298 return xfs_sb_is_v5(sbp) || 299 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 300 } 301 302 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 303 { 304 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 305 } 306 307 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 308 { 309 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 310 } 311 312 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 313 { 314 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 315 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 316 } 317 318 static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp) 319 { 320 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 321 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 322 } 323 324 /* 325 * Extended v5 superblock feature masks. These are to be used for new v5 326 * superblock features only. 327 * 328 * Compat features are new features that old kernels will not notice or affect 329 * and so can mount read-write without issues. 330 * 331 * RO-Compat (read only) are features that old kernels can read but will break 332 * if they write. Hence only read-only mounts of such filesystems are allowed on 333 * kernels that don't support the feature bit. 334 * 335 * InCompat features are features which old kernels will not understand and so 336 * must not mount. 337 * 338 * Log-InCompat features are for changes to log formats or new transactions that 339 * can't be replayed on older kernels. The fields are set when the filesystem is 340 * mounted, and a clean unmount clears the fields. 341 */ 342 #define XFS_SB_FEAT_COMPAT_ALL 0 343 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 344 static inline bool 345 xfs_sb_has_compat_feature( 346 struct xfs_sb *sbp, 347 uint32_t feature) 348 { 349 return (sbp->sb_features_compat & feature) != 0; 350 } 351 352 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 353 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ 354 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ 355 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ 356 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 357 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 358 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 359 XFS_SB_FEAT_RO_COMPAT_REFLINK| \ 360 XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 361 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 362 static inline bool 363 xfs_sb_has_ro_compat_feature( 364 struct xfs_sb *sbp, 365 uint32_t feature) 366 { 367 return (sbp->sb_features_ro_compat & feature) != 0; 368 } 369 370 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 371 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 372 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 373 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ 374 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */ 375 #define XFS_SB_FEAT_INCOMPAT_ALL \ 376 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 377 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 378 XFS_SB_FEAT_INCOMPAT_META_UUID| \ 379 XFS_SB_FEAT_INCOMPAT_BIGTIME| \ 380 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR) 381 382 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 383 static inline bool 384 xfs_sb_has_incompat_feature( 385 struct xfs_sb *sbp, 386 uint32_t feature) 387 { 388 return (sbp->sb_features_incompat & feature) != 0; 389 } 390 391 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 392 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 393 static inline bool 394 xfs_sb_has_incompat_log_feature( 395 struct xfs_sb *sbp, 396 uint32_t feature) 397 { 398 return (sbp->sb_features_log_incompat & feature) != 0; 399 } 400 401 static inline void 402 xfs_sb_remove_incompat_log_features( 403 struct xfs_sb *sbp) 404 { 405 sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL; 406 } 407 408 static inline void 409 xfs_sb_add_incompat_log_features( 410 struct xfs_sb *sbp, 411 unsigned int features) 412 { 413 sbp->sb_features_log_incompat |= features; 414 } 415 416 417 static inline bool 418 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 419 { 420 return (ino == sbp->sb_uquotino || 421 ino == sbp->sb_gquotino || 422 ino == sbp->sb_pquotino); 423 } 424 425 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 426 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 427 428 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 429 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 430 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 431 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 432 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 433 434 /* 435 * File system sector to basic block conversions. 436 */ 437 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 438 439 /* 440 * File system block to basic block conversions. 441 */ 442 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 443 #define XFS_BB_TO_FSB(mp,bb) \ 444 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 445 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 446 447 /* 448 * File system block to byte conversions. 449 */ 450 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 451 #define XFS_B_TO_FSB(mp,b) \ 452 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 453 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 454 455 /* 456 * Allocation group header 457 * 458 * This is divided into three structures, placed in sequential 512-byte 459 * buffers after a copy of the superblock (also in a 512-byte buffer). 460 */ 461 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 462 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 463 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 464 #define XFS_AGF_VERSION 1 465 #define XFS_AGI_VERSION 1 466 467 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 468 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 469 470 /* 471 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the 472 * arrays below. 473 */ 474 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1) 475 476 /* 477 * The second word of agf_levels in the first a.g. overlaps the EFS 478 * superblock's magic number. Since the magic numbers valid for EFS 479 * are > 64k, our value cannot be confused for an EFS superblock's. 480 */ 481 482 typedef struct xfs_agf { 483 /* 484 * Common allocation group header information 485 */ 486 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 487 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 488 __be32 agf_seqno; /* sequence # starting from 0 */ 489 __be32 agf_length; /* size in blocks of a.g. */ 490 /* 491 * Freespace and rmap information 492 */ 493 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 494 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 495 496 __be32 agf_flfirst; /* first freelist block's index */ 497 __be32 agf_fllast; /* last freelist block's index */ 498 __be32 agf_flcount; /* count of blocks in freelist */ 499 __be32 agf_freeblks; /* total free blocks */ 500 501 __be32 agf_longest; /* longest free space */ 502 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 503 uuid_t agf_uuid; /* uuid of filesystem */ 504 505 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 506 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 507 508 __be32 agf_refcount_root; /* refcount tree root block */ 509 __be32 agf_refcount_level; /* refcount btree levels */ 510 511 /* 512 * reserve some contiguous space for future logged fields before we add 513 * the unlogged fields. This makes the range logging via flags and 514 * structure offsets much simpler. 515 */ 516 __be64 agf_spare64[14]; 517 518 /* unlogged fields, written during buffer writeback. */ 519 __be64 agf_lsn; /* last write sequence */ 520 __be32 agf_crc; /* crc of agf sector */ 521 __be32 agf_spare2; 522 523 /* structure must be padded to 64 bit alignment */ 524 } xfs_agf_t; 525 526 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 527 528 #define XFS_AGF_MAGICNUM 0x00000001 529 #define XFS_AGF_VERSIONNUM 0x00000002 530 #define XFS_AGF_SEQNO 0x00000004 531 #define XFS_AGF_LENGTH 0x00000008 532 #define XFS_AGF_ROOTS 0x00000010 533 #define XFS_AGF_LEVELS 0x00000020 534 #define XFS_AGF_FLFIRST 0x00000040 535 #define XFS_AGF_FLLAST 0x00000080 536 #define XFS_AGF_FLCOUNT 0x00000100 537 #define XFS_AGF_FREEBLKS 0x00000200 538 #define XFS_AGF_LONGEST 0x00000400 539 #define XFS_AGF_BTREEBLKS 0x00000800 540 #define XFS_AGF_UUID 0x00001000 541 #define XFS_AGF_RMAP_BLOCKS 0x00002000 542 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 543 #define XFS_AGF_REFCOUNT_ROOT 0x00008000 544 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000 545 #define XFS_AGF_SPARE64 0x00020000 546 #define XFS_AGF_NUM_BITS 18 547 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 548 549 #define XFS_AGF_FLAGS \ 550 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 551 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 552 { XFS_AGF_SEQNO, "SEQNO" }, \ 553 { XFS_AGF_LENGTH, "LENGTH" }, \ 554 { XFS_AGF_ROOTS, "ROOTS" }, \ 555 { XFS_AGF_LEVELS, "LEVELS" }, \ 556 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 557 { XFS_AGF_FLLAST, "FLLAST" }, \ 558 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 559 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 560 { XFS_AGF_LONGEST, "LONGEST" }, \ 561 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 562 { XFS_AGF_UUID, "UUID" }, \ 563 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 564 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 565 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 566 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 567 { XFS_AGF_SPARE64, "SPARE64" } 568 569 /* disk block (xfs_daddr_t) in the AG */ 570 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 571 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 572 573 /* 574 * Size of the unlinked inode hash table in the agi. 575 */ 576 #define XFS_AGI_UNLINKED_BUCKETS 64 577 578 typedef struct xfs_agi { 579 /* 580 * Common allocation group header information 581 */ 582 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 583 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 584 __be32 agi_seqno; /* sequence # starting from 0 */ 585 __be32 agi_length; /* size in blocks of a.g. */ 586 /* 587 * Inode information 588 * Inodes are mapped by interpreting the inode number, so no 589 * mapping data is needed here. 590 */ 591 __be32 agi_count; /* count of allocated inodes */ 592 __be32 agi_root; /* root of inode btree */ 593 __be32 agi_level; /* levels in inode btree */ 594 __be32 agi_freecount; /* number of free inodes */ 595 596 __be32 agi_newino; /* new inode just allocated */ 597 __be32 agi_dirino; /* last directory inode chunk */ 598 /* 599 * Hash table of inodes which have been unlinked but are 600 * still being referenced. 601 */ 602 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 603 /* 604 * This marks the end of logging region 1 and start of logging region 2. 605 */ 606 uuid_t agi_uuid; /* uuid of filesystem */ 607 __be32 agi_crc; /* crc of agi sector */ 608 __be32 agi_pad32; 609 __be64 agi_lsn; /* last write sequence */ 610 611 __be32 agi_free_root; /* root of the free inode btree */ 612 __be32 agi_free_level;/* levels in free inode btree */ 613 614 __be32 agi_iblocks; /* inobt blocks used */ 615 __be32 agi_fblocks; /* finobt blocks used */ 616 617 /* structure must be padded to 64 bit alignment */ 618 } xfs_agi_t; 619 620 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 621 622 #define XFS_AGI_MAGICNUM (1 << 0) 623 #define XFS_AGI_VERSIONNUM (1 << 1) 624 #define XFS_AGI_SEQNO (1 << 2) 625 #define XFS_AGI_LENGTH (1 << 3) 626 #define XFS_AGI_COUNT (1 << 4) 627 #define XFS_AGI_ROOT (1 << 5) 628 #define XFS_AGI_LEVEL (1 << 6) 629 #define XFS_AGI_FREECOUNT (1 << 7) 630 #define XFS_AGI_NEWINO (1 << 8) 631 #define XFS_AGI_DIRINO (1 << 9) 632 #define XFS_AGI_UNLINKED (1 << 10) 633 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 634 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 635 #define XFS_AGI_FREE_ROOT (1 << 11) 636 #define XFS_AGI_FREE_LEVEL (1 << 12) 637 #define XFS_AGI_IBLOCKS (1 << 13) /* both inobt/finobt block counters */ 638 #define XFS_AGI_NUM_BITS_R2 14 639 640 /* disk block (xfs_daddr_t) in the AG */ 641 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 642 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 643 644 /* 645 * The third a.g. block contains the a.g. freelist, an array 646 * of block pointers to blocks owned by the allocation btree code. 647 */ 648 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 649 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 650 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr)) 651 652 struct xfs_agfl { 653 __be32 agfl_magicnum; 654 __be32 agfl_seqno; 655 uuid_t agfl_uuid; 656 __be64 agfl_lsn; 657 __be32 agfl_crc; 658 } __attribute__((packed)); 659 660 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 661 662 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 663 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 664 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 665 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 666 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 667 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 668 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 669 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 670 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 671 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 672 673 /* 674 * For checking for bad ranges of xfs_daddr_t's, covering multiple 675 * allocation groups or a single xfs_daddr_t that's a superblock copy. 676 */ 677 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 678 ((len) == 1 ? \ 679 ASSERT((d) == XFS_SB_DADDR || \ 680 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 681 ASSERT(xfs_daddr_to_agno(mp, d) == \ 682 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 683 684 /* 685 * XFS Timestamps 686 * ============== 687 * 688 * Traditional ondisk inode timestamps consist of signed 32-bit counters for 689 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC 690 * 1970, which means that the timestamp epoch is the same as the Unix epoch. 691 * Therefore, the ondisk min and max defined here can be used directly to 692 * constrain the incore timestamps on a Unix system. Note that we actually 693 * encode a __be64 value on disk. 694 * 695 * When the bigtime feature is enabled, ondisk inode timestamps become an 696 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode 697 * timestamp epoch is the start of the classic timestamp range, which is 698 * Dec 31 20:45:52 UTC 1901. Because the epochs are not the same, callers 699 * /must/ use the bigtime conversion functions when encoding and decoding raw 700 * timestamps. 701 */ 702 typedef __be64 xfs_timestamp_t; 703 704 /* Legacy timestamp encoding format. */ 705 struct xfs_legacy_timestamp { 706 __be32 t_sec; /* timestamp seconds */ 707 __be32 t_nsec; /* timestamp nanoseconds */ 708 }; 709 710 /* 711 * Smallest possible ondisk seconds value with traditional timestamps. This 712 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901. 713 */ 714 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN) 715 716 /* 717 * Largest possible ondisk seconds value with traditional timestamps. This 718 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038. 719 */ 720 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) 721 722 /* 723 * Smallest possible ondisk seconds value with bigtime timestamps. This 724 * corresponds (after conversion to a Unix timestamp) with the traditional 725 * minimum timestamp of Dec 13 20:45:52 UTC 1901. 726 */ 727 #define XFS_BIGTIME_TIME_MIN ((int64_t)0) 728 729 /* 730 * Largest supported ondisk seconds value with bigtime timestamps. This 731 * corresponds (after conversion to a Unix timestamp) with an incore timestamp 732 * of Jul 2 20:20:24 UTC 2486. 733 * 734 * We round down the ondisk limit so that the bigtime quota and inode max 735 * timestamps will be the same. 736 */ 737 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL)) 738 739 /* 740 * Bigtime epoch is set exactly to the minimum time value that a traditional 741 * 32-bit timestamp can represent when using the Unix epoch as a reference. 742 * Hence the Unix epoch is at a fixed offset into the supported bigtime 743 * timestamp range. 744 * 745 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS 746 * timestamp can represent so we will not lose any fidelity in converting 747 * to/from unix and bigtime timestamps. 748 * 749 * The following conversion factor converts a seconds counter from the Unix 750 * epoch to the bigtime epoch. 751 */ 752 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN) 753 754 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */ 755 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds) 756 { 757 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET; 758 } 759 760 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */ 761 static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds) 762 { 763 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET; 764 } 765 766 /* 767 * On-disk inode structure. 768 * 769 * This is just the header or "dinode core", the inode is expanded to fill a 770 * variable size the leftover area split into a data and an attribute fork. 771 * The format of the data and attribute fork depends on the format of the 772 * inode as indicated by di_format and di_aformat. To access the data and 773 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 774 * below. 775 * 776 * There is a very similar struct xfs_log_dinode which matches the layout of 777 * this structure, but is kept in native format instead of big endian. 778 * 779 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 780 * padding field for v3 inodes. 781 */ 782 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 783 struct xfs_dinode { 784 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 785 __be16 di_mode; /* mode and type of file */ 786 __u8 di_version; /* inode version */ 787 __u8 di_format; /* format of di_c data */ 788 __be16 di_onlink; /* old number of links to file */ 789 __be32 di_uid; /* owner's user id */ 790 __be32 di_gid; /* owner's group id */ 791 __be32 di_nlink; /* number of links to file */ 792 __be16 di_projid_lo; /* lower part of owner's project id */ 793 __be16 di_projid_hi; /* higher part owner's project id */ 794 __u8 di_pad[6]; /* unused, zeroed space */ 795 __be16 di_flushiter; /* incremented on flush */ 796 xfs_timestamp_t di_atime; /* time last accessed */ 797 xfs_timestamp_t di_mtime; /* time last modified */ 798 xfs_timestamp_t di_ctime; /* time created/inode modified */ 799 __be64 di_size; /* number of bytes in file */ 800 __be64 di_nblocks; /* # of direct & btree blocks used */ 801 __be32 di_extsize; /* basic/minimum extent size for file */ 802 __be32 di_nextents; /* number of extents in data fork */ 803 __be16 di_anextents; /* number of extents in attribute fork*/ 804 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 805 __s8 di_aformat; /* format of attr fork's data */ 806 __be32 di_dmevmask; /* DMIG event mask */ 807 __be16 di_dmstate; /* DMIG state info */ 808 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 809 __be32 di_gen; /* generation number */ 810 811 /* di_next_unlinked is the only non-core field in the old dinode */ 812 __be32 di_next_unlinked;/* agi unlinked list ptr */ 813 814 /* start of the extended dinode, writable fields */ 815 __le32 di_crc; /* CRC of the inode */ 816 __be64 di_changecount; /* number of attribute changes */ 817 __be64 di_lsn; /* flush sequence */ 818 __be64 di_flags2; /* more random flags */ 819 __be32 di_cowextsize; /* basic cow extent size for file */ 820 __u8 di_pad2[12]; /* more padding for future expansion */ 821 822 /* fields only written to during inode creation */ 823 xfs_timestamp_t di_crtime; /* time created */ 824 __be64 di_ino; /* inode number */ 825 uuid_t di_uuid; /* UUID of the filesystem */ 826 827 /* structure must be padded to 64 bit alignment */ 828 }; 829 830 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 831 832 #define DI_MAX_FLUSH 0xffff 833 834 /* 835 * Size of the core inode on disk. Version 1 and 2 inodes have 836 * the same size, but version 3 has grown a few additional fields. 837 */ 838 static inline uint xfs_dinode_size(int version) 839 { 840 if (version == 3) 841 return sizeof(struct xfs_dinode); 842 return offsetof(struct xfs_dinode, di_crc); 843 } 844 845 /* 846 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 847 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 848 */ 849 #define XFS_MAXLINK ((1U << 31) - 1U) 850 851 /* 852 * Values for di_format 853 * 854 * This enum is used in string mapping in xfs_trace.h; please keep the 855 * TRACE_DEFINE_ENUMs for it up to date. 856 */ 857 enum xfs_dinode_fmt { 858 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 859 XFS_DINODE_FMT_LOCAL, /* bulk data */ 860 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 861 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 862 XFS_DINODE_FMT_UUID /* added long ago, but never used */ 863 }; 864 865 #define XFS_INODE_FORMAT_STR \ 866 { XFS_DINODE_FMT_DEV, "dev" }, \ 867 { XFS_DINODE_FMT_LOCAL, "local" }, \ 868 { XFS_DINODE_FMT_EXTENTS, "extent" }, \ 869 { XFS_DINODE_FMT_BTREE, "btree" }, \ 870 { XFS_DINODE_FMT_UUID, "uuid" } 871 872 /* 873 * Inode minimum and maximum sizes. 874 */ 875 #define XFS_DINODE_MIN_LOG 8 876 #define XFS_DINODE_MAX_LOG 11 877 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 878 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 879 880 /* 881 * Inode size for given fs. 882 */ 883 #define XFS_DINODE_SIZE(mp) \ 884 (xfs_has_v3inodes(mp) ? \ 885 sizeof(struct xfs_dinode) : \ 886 offsetof(struct xfs_dinode, di_crc)) 887 #define XFS_LITINO(mp) \ 888 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp)) 889 890 /* 891 * Inode data & attribute fork sizes, per inode. 892 */ 893 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 894 895 #define XFS_DFORK_DSIZE(dip,mp) \ 896 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp)) 897 #define XFS_DFORK_ASIZE(dip,mp) \ 898 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0) 899 #define XFS_DFORK_SIZE(dip,mp,w) \ 900 ((w) == XFS_DATA_FORK ? \ 901 XFS_DFORK_DSIZE(dip, mp) : \ 902 XFS_DFORK_ASIZE(dip, mp)) 903 904 #define XFS_DFORK_MAXEXT(dip, mp, w) \ 905 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec)) 906 907 /* 908 * Return pointers to the data or attribute forks. 909 */ 910 #define XFS_DFORK_DPTR(dip) \ 911 ((char *)dip + xfs_dinode_size(dip->di_version)) 912 #define XFS_DFORK_APTR(dip) \ 913 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 914 #define XFS_DFORK_PTR(dip,w) \ 915 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 916 917 #define XFS_DFORK_FORMAT(dip,w) \ 918 ((w) == XFS_DATA_FORK ? \ 919 (dip)->di_format : \ 920 (dip)->di_aformat) 921 #define XFS_DFORK_NEXTENTS(dip,w) \ 922 ((w) == XFS_DATA_FORK ? \ 923 be32_to_cpu((dip)->di_nextents) : \ 924 be16_to_cpu((dip)->di_anextents)) 925 926 /* 927 * For block and character special files the 32bit dev_t is stored at the 928 * beginning of the data fork. 929 */ 930 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 931 { 932 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 933 } 934 935 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 936 { 937 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 938 } 939 940 /* 941 * Values for di_flags 942 */ 943 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 944 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 945 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 946 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 947 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 948 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 949 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 950 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 951 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 952 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 953 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 954 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 955 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 956 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 957 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 958 /* Do not use bit 15, di_flags is legacy and unchanging now */ 959 960 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 961 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 962 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 963 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 964 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 965 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 966 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 967 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 968 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 969 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 970 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 971 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 972 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 973 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 974 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 975 976 #define XFS_DIFLAG_ANY \ 977 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 978 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 979 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 980 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 981 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 982 983 /* 984 * Values for di_flags2 These start by being exposed to userspace in the upper 985 * 16 bits of the XFS_XFLAG_s range. 986 */ 987 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 988 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ 989 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ 990 #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */ 991 992 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 993 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) 994 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) 995 #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT) 996 997 #define XFS_DIFLAG2_ANY \ 998 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ 999 XFS_DIFLAG2_BIGTIME) 1000 1001 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) 1002 { 1003 return dip->di_version >= 3 && 1004 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME)); 1005 } 1006 1007 /* 1008 * Inode number format: 1009 * low inopblog bits - offset in block 1010 * next agblklog bits - block number in ag 1011 * next agno_log bits - ag number 1012 * high agno_log-agblklog-inopblog bits - 0 1013 */ 1014 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1) 1015 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1016 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1017 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log) 1018 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1019 #define XFS_INO_BITS(mp) \ 1020 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1021 #define XFS_INO_TO_AGNO(mp,i) \ 1022 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1023 #define XFS_INO_TO_AGINO(mp,i) \ 1024 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1025 #define XFS_INO_TO_AGBNO(mp,i) \ 1026 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1027 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1028 #define XFS_INO_TO_OFFSET(mp,i) \ 1029 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1030 #define XFS_INO_TO_FSB(mp,i) \ 1031 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1032 #define XFS_AGINO_TO_INO(mp,a,i) \ 1033 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1034 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1035 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1036 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1037 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1038 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1039 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1040 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1041 1042 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1043 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1044 1045 /* 1046 * RealTime Device format definitions 1047 */ 1048 1049 /* Min and max rt extent sizes, specified in bytes */ 1050 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1051 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1052 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1053 1054 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1055 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1056 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1057 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1058 1059 /* 1060 * RT Summary and bit manipulation macros. 1061 */ 1062 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1063 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1064 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1065 #define XFS_SUMPTR(mp,bp,so) \ 1066 ((xfs_suminfo_t *)((bp)->b_addr + \ 1067 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1068 1069 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1070 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1071 #define XFS_BITTOWORD(mp,bi) \ 1072 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1073 1074 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1075 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1076 1077 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1078 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1079 1080 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1081 1082 /* 1083 * Dquot and dquot block format definitions 1084 */ 1085 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1086 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */ 1087 1088 #define XFS_DQTYPE_USER 0x01 /* user dquot record */ 1089 #define XFS_DQTYPE_PROJ 0x02 /* project dquot record */ 1090 #define XFS_DQTYPE_GROUP 0x04 /* group dquot record */ 1091 #define XFS_DQTYPE_BIGTIME 0x80 /* large expiry timestamps */ 1092 1093 /* bitmask to determine if this is a user/group/project dquot */ 1094 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \ 1095 XFS_DQTYPE_PROJ | \ 1096 XFS_DQTYPE_GROUP) 1097 1098 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \ 1099 XFS_DQTYPE_BIGTIME) 1100 1101 /* 1102 * XFS Quota Timers 1103 * ================ 1104 * 1105 * Traditional quota grace period expiration timers are an unsigned 32-bit 1106 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970. 1107 * Note that an expiration value of zero means that the quota limit has not 1108 * been reached, and therefore no expiration has been set. Therefore, the 1109 * ondisk min and max defined here can be used directly to constrain the incore 1110 * quota expiration timestamps on a Unix system. 1111 * 1112 * When bigtime is enabled, we trade two bits of precision to expand the 1113 * expiration timeout range to match that of big inode timestamps. The min and 1114 * max recorded here are the on-disk limits, not a Unix timestamp. 1115 * 1116 * The grace period for each quota type is stored in the root dquot (id = 0) 1117 * and is applied to a non-root dquot when it exceeds the soft or hard limits. 1118 * The length of quota grace periods are unsigned 32-bit quantities measured in 1119 * units of seconds. A value of zero means to use the default period. 1120 */ 1121 1122 /* 1123 * Smallest possible ondisk quota expiration value with traditional timestamps. 1124 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970. 1125 */ 1126 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1) 1127 1128 /* 1129 * Largest possible ondisk quota expiration value with traditional timestamps. 1130 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106. 1131 */ 1132 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX) 1133 1134 /* 1135 * Smallest possible ondisk quota expiration value with bigtime timestamps. 1136 * This corresponds (after conversion to a Unix timestamp) with the incore 1137 * expiration of Jan 1 00:00:04 UTC 1970. 1138 */ 1139 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN) 1140 1141 /* 1142 * Largest supported ondisk quota expiration value with bigtime timestamps. 1143 * This corresponds (after conversion to a Unix timestamp) with an incore 1144 * expiration of Jul 2 20:20:24 UTC 2486. 1145 * 1146 * The ondisk field supports values up to -1U, which corresponds to an incore 1147 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp, 1148 * so we cap the maximum bigtime quota expiration to the max inode timestamp. 1149 */ 1150 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U) 1151 1152 /* 1153 * The following conversion factors assist in converting a quota expiration 1154 * timestamp between the incore and ondisk formats. 1155 */ 1156 #define XFS_DQ_BIGTIME_SHIFT (2) 1157 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1) 1158 1159 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */ 1160 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds) 1161 { 1162 /* 1163 * Round the expiration timestamp up to the nearest bigtime timestamp 1164 * that we can store, to give users the most time to fix problems. 1165 */ 1166 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >> 1167 XFS_DQ_BIGTIME_SHIFT; 1168 } 1169 1170 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */ 1171 static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds) 1172 { 1173 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT; 1174 } 1175 1176 /* 1177 * Default quota grace periods, ranging from zero (use the compiled defaults) 1178 * to ~136 years. These are applied to a non-root dquot that has exceeded 1179 * either limit. 1180 */ 1181 #define XFS_DQ_GRACE_MIN ((int64_t)0) 1182 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX) 1183 1184 /* 1185 * This is the main portion of the on-disk representation of quota information 1186 * for a user. We pad this with some more expansion room to construct the on 1187 * disk structure. 1188 */ 1189 struct xfs_disk_dquot { 1190 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1191 __u8 d_version; /* dquot version */ 1192 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */ 1193 __be32 d_id; /* user,project,group id */ 1194 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1195 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1196 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1197 __be64 d_ino_softlimit;/* preferred inode limit */ 1198 __be64 d_bcount; /* disk blocks owned by the user */ 1199 __be64 d_icount; /* inodes owned by the user */ 1200 __be32 d_itimer; /* zero if within inode limits if not, 1201 this is when we refuse service */ 1202 __be32 d_btimer; /* similar to above; for disk blocks */ 1203 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1204 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1205 __be32 d_pad0; /* 64 bit align */ 1206 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1207 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1208 __be64 d_rtbcount; /* realtime blocks owned */ 1209 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1210 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1211 __be16 d_pad; 1212 }; 1213 1214 /* 1215 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1216 * carrying the unnecessary padding would be a waste of memory. 1217 */ 1218 struct xfs_dqblk { 1219 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */ 1220 char dd_fill[4];/* filling for posterity */ 1221 1222 /* 1223 * These two are only present on filesystems with the CRC bits set. 1224 */ 1225 __be32 dd_crc; /* checksum */ 1226 __be64 dd_lsn; /* last modification in log */ 1227 uuid_t dd_uuid; /* location information */ 1228 }; 1229 1230 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1231 1232 /* 1233 * This defines the unit of allocation of dquots. 1234 * 1235 * Currently, it is just one file system block, and a 4K blk contains 30 1236 * (136 * 30 = 4080) dquots. It's probably not worth trying to make 1237 * this more dynamic. 1238 * 1239 * However, if this number is changed, we have to make sure that we don't 1240 * implicitly assume that we do allocations in chunks of a single filesystem 1241 * block in the dquot/xqm code. 1242 * 1243 * This is part of the ondisk format because the structure size is not a power 1244 * of two, which leaves slack at the end of the disk block. 1245 */ 1246 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1 1247 1248 /* 1249 * Remote symlink format and access functions. 1250 */ 1251 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1252 1253 struct xfs_dsymlink_hdr { 1254 __be32 sl_magic; 1255 __be32 sl_offset; 1256 __be32 sl_bytes; 1257 __be32 sl_crc; 1258 uuid_t sl_uuid; 1259 __be64 sl_owner; 1260 __be64 sl_blkno; 1261 __be64 sl_lsn; 1262 }; 1263 1264 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1265 1266 #define XFS_SYMLINK_MAXLEN 1024 1267 /* 1268 * The maximum pathlen is 1024 bytes. Since the minimum file system 1269 * blocksize is 512 bytes, we can get a max of 3 extents back from 1270 * bmapi when crc headers are taken into account. 1271 */ 1272 #define XFS_SYMLINK_MAPS 3 1273 1274 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1275 ((bufsize) - (xfs_has_crc((mp)) ? \ 1276 sizeof(struct xfs_dsymlink_hdr) : 0)) 1277 1278 1279 /* 1280 * Allocation Btree format definitions 1281 * 1282 * There are two on-disk btrees, one sorted by blockno and one sorted 1283 * by blockcount and blockno. All blocks look the same to make the code 1284 * simpler; if we have time later, we'll make the optimizations. 1285 */ 1286 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1287 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1288 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1289 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1290 1291 /* 1292 * Data record/key structure 1293 */ 1294 typedef struct xfs_alloc_rec { 1295 __be32 ar_startblock; /* starting block number */ 1296 __be32 ar_blockcount; /* count of free blocks */ 1297 } xfs_alloc_rec_t, xfs_alloc_key_t; 1298 1299 typedef struct xfs_alloc_rec_incore { 1300 xfs_agblock_t ar_startblock; /* starting block number */ 1301 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1302 } xfs_alloc_rec_incore_t; 1303 1304 /* btree pointer type */ 1305 typedef __be32 xfs_alloc_ptr_t; 1306 1307 /* 1308 * Block numbers in the AG: 1309 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1310 */ 1311 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1312 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1313 1314 1315 /* 1316 * Inode Allocation Btree format definitions 1317 * 1318 * There is a btree for the inode map per allocation group. 1319 */ 1320 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1321 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1322 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1323 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1324 1325 typedef uint64_t xfs_inofree_t; 1326 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1327 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1328 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1329 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1330 1331 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1332 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t)) 1333 #define XFS_INODES_PER_HOLEMASK_BIT \ 1334 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t))) 1335 1336 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1337 { 1338 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1339 } 1340 1341 /* 1342 * The on-disk inode record structure has two formats. The original "full" 1343 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1344 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1345 * count. 1346 * 1347 * The holemask of the sparse record format allows an inode chunk to have holes 1348 * that refer to blocks not owned by the inode record. This facilitates inode 1349 * allocation in the event of severe free space fragmentation. 1350 */ 1351 typedef struct xfs_inobt_rec { 1352 __be32 ir_startino; /* starting inode number */ 1353 union { 1354 struct { 1355 __be32 ir_freecount; /* count of free inodes */ 1356 } f; 1357 struct { 1358 __be16 ir_holemask;/* hole mask for sparse chunks */ 1359 __u8 ir_count; /* total inode count */ 1360 __u8 ir_freecount; /* count of free inodes */ 1361 } sp; 1362 } ir_u; 1363 __be64 ir_free; /* free inode mask */ 1364 } xfs_inobt_rec_t; 1365 1366 typedef struct xfs_inobt_rec_incore { 1367 xfs_agino_t ir_startino; /* starting inode number */ 1368 uint16_t ir_holemask; /* hole mask for sparse chunks */ 1369 uint8_t ir_count; /* total inode count */ 1370 uint8_t ir_freecount; /* count of free inodes (set bits) */ 1371 xfs_inofree_t ir_free; /* free inode mask */ 1372 } xfs_inobt_rec_incore_t; 1373 1374 static inline bool xfs_inobt_issparse(uint16_t holemask) 1375 { 1376 /* non-zero holemask represents a sparse rec. */ 1377 return holemask; 1378 } 1379 1380 /* 1381 * Key structure 1382 */ 1383 typedef struct xfs_inobt_key { 1384 __be32 ir_startino; /* starting inode number */ 1385 } xfs_inobt_key_t; 1386 1387 /* btree pointer type */ 1388 typedef __be32 xfs_inobt_ptr_t; 1389 1390 /* 1391 * block numbers in the AG. 1392 */ 1393 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1394 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1395 1396 /* 1397 * Reverse mapping btree format definitions 1398 * 1399 * There is a btree for the reverse map per allocation group 1400 */ 1401 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1402 1403 /* 1404 * Ownership info for an extent. This is used to create reverse-mapping 1405 * entries. 1406 */ 1407 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1408 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1409 struct xfs_owner_info { 1410 uint64_t oi_owner; 1411 xfs_fileoff_t oi_offset; 1412 unsigned int oi_flags; 1413 }; 1414 1415 /* 1416 * Special owner types. 1417 * 1418 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1419 * to tell us we have a special owner value. We use these for static metadata 1420 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1421 */ 1422 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1423 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1424 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1425 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1426 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1427 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1428 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1429 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1430 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1431 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1432 1433 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1434 1435 /* 1436 * Data record structure 1437 */ 1438 struct xfs_rmap_rec { 1439 __be32 rm_startblock; /* extent start block */ 1440 __be32 rm_blockcount; /* extent length */ 1441 __be64 rm_owner; /* extent owner */ 1442 __be64 rm_offset; /* offset within the owner */ 1443 }; 1444 1445 /* 1446 * rmap btree record 1447 * rm_offset:63 is the attribute fork flag 1448 * rm_offset:62 is the bmbt block flag 1449 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1450 * rm_offset:54-60 aren't used and should be zero 1451 * rm_offset:0-53 is the block offset within the inode 1452 */ 1453 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63) 1454 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62) 1455 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61) 1456 1457 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U) 1458 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1459 XFS_RMAP_OFF_BMBT_BLOCK | \ 1460 XFS_RMAP_OFF_UNWRITTEN) 1461 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL) 1462 1463 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1464 1465 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1466 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1467 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1468 1469 #define RMAPBT_STARTBLOCK_BITLEN 32 1470 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1471 #define RMAPBT_OWNER_BITLEN 64 1472 #define RMAPBT_ATTRFLAG_BITLEN 1 1473 #define RMAPBT_BMBTFLAG_BITLEN 1 1474 #define RMAPBT_EXNTFLAG_BITLEN 1 1475 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1476 #define RMAPBT_OFFSET_BITLEN 54 1477 1478 #define XFS_RMAP_ATTR_FORK (1 << 0) 1479 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1480 #define XFS_RMAP_UNWRITTEN (1 << 2) 1481 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1482 XFS_RMAP_BMBT_BLOCK) 1483 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1484 struct xfs_rmap_irec { 1485 xfs_agblock_t rm_startblock; /* extent start block */ 1486 xfs_extlen_t rm_blockcount; /* extent length */ 1487 uint64_t rm_owner; /* extent owner */ 1488 uint64_t rm_offset; /* offset within the owner */ 1489 unsigned int rm_flags; /* state flags */ 1490 }; 1491 1492 /* 1493 * Key structure 1494 * 1495 * We don't use the length for lookups 1496 */ 1497 struct xfs_rmap_key { 1498 __be32 rm_startblock; /* extent start block */ 1499 __be64 rm_owner; /* extent owner */ 1500 __be64 rm_offset; /* offset within the owner */ 1501 } __attribute__((packed)); 1502 1503 /* btree pointer type */ 1504 typedef __be32 xfs_rmap_ptr_t; 1505 1506 #define XFS_RMAP_BLOCK(mp) \ 1507 (xfs_has_finobt(((mp))) ? \ 1508 XFS_FIBT_BLOCK(mp) + 1 : \ 1509 XFS_IBT_BLOCK(mp) + 1) 1510 1511 /* 1512 * Reference Count Btree format definitions 1513 * 1514 */ 1515 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1516 1517 unsigned int xfs_refc_block(struct xfs_mount *mp); 1518 1519 /* 1520 * Data record/key structure 1521 * 1522 * Each record associates a range of physical blocks (starting at 1523 * rc_startblock and ending rc_blockcount blocks later) with a reference 1524 * count (rc_refcount). Extents that are being used to stage a copy on 1525 * write (CoW) operation are recorded in the refcount btree with a 1526 * refcount of 1. All other records must have a refcount > 1 and must 1527 * track an extent mapped only by file data forks. 1528 * 1529 * Extents with a single owner (attributes, metadata, non-shared file 1530 * data) are not tracked here. Free space is also not tracked here. 1531 * This is consistent with pre-reflink XFS. 1532 */ 1533 1534 /* 1535 * Extents that are being used to stage a copy on write are stored 1536 * in the refcount btree with a refcount of 1 and the upper bit set 1537 * on the startblock. This speeds up mount time deletion of stale 1538 * staging extents because they're all at the right side of the tree. 1539 */ 1540 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) 1541 #define REFCNTBT_COWFLAG_BITLEN 1 1542 #define REFCNTBT_AGBLOCK_BITLEN 31 1543 1544 struct xfs_refcount_rec { 1545 __be32 rc_startblock; /* starting block number */ 1546 __be32 rc_blockcount; /* count of blocks */ 1547 __be32 rc_refcount; /* number of inodes linked here */ 1548 }; 1549 1550 struct xfs_refcount_key { 1551 __be32 rc_startblock; /* starting block number */ 1552 }; 1553 1554 struct xfs_refcount_irec { 1555 xfs_agblock_t rc_startblock; /* starting block number */ 1556 xfs_extlen_t rc_blockcount; /* count of free blocks */ 1557 xfs_nlink_t rc_refcount; /* number of inodes linked here */ 1558 }; 1559 1560 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1561 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1562 1563 /* btree pointer type */ 1564 typedef __be32 xfs_refcount_ptr_t; 1565 1566 1567 /* 1568 * BMAP Btree format definitions 1569 * 1570 * This includes both the root block definition that sits inside an inode fork 1571 * and the record/pointer formats for the leaf/node in the blocks. 1572 */ 1573 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1574 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1575 1576 /* 1577 * Bmap root header, on-disk form only. 1578 */ 1579 typedef struct xfs_bmdr_block { 1580 __be16 bb_level; /* 0 is a leaf */ 1581 __be16 bb_numrecs; /* current # of data records */ 1582 } xfs_bmdr_block_t; 1583 1584 /* 1585 * Bmap btree record and extent descriptor. 1586 * l0:63 is an extent flag (value 1 indicates non-normal). 1587 * l0:9-62 are startoff. 1588 * l0:0-8 and l1:21-63 are startblock. 1589 * l1:0-20 are blockcount. 1590 */ 1591 #define BMBT_EXNTFLAG_BITLEN 1 1592 #define BMBT_STARTOFF_BITLEN 54 1593 #define BMBT_STARTBLOCK_BITLEN 52 1594 #define BMBT_BLOCKCOUNT_BITLEN 21 1595 1596 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1) 1597 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1) 1598 1599 /* 1600 * bmbt records have a file offset (block) field that is 54 bits wide, so this 1601 * is the largest xfs_fileoff_t that we ever expect to see. 1602 */ 1603 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK) 1604 1605 typedef struct xfs_bmbt_rec { 1606 __be64 l0, l1; 1607 } xfs_bmbt_rec_t; 1608 1609 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1610 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1611 1612 /* 1613 * Values and macros for delayed-allocation startblock fields. 1614 */ 1615 #define STARTBLOCKVALBITS 17 1616 #define STARTBLOCKMASKBITS (15 + 20) 1617 #define STARTBLOCKMASK \ 1618 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1619 1620 static inline int isnullstartblock(xfs_fsblock_t x) 1621 { 1622 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1623 } 1624 1625 static inline xfs_fsblock_t nullstartblock(int k) 1626 { 1627 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1628 return STARTBLOCKMASK | (k); 1629 } 1630 1631 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1632 { 1633 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1634 } 1635 1636 /* 1637 * Key structure for non-leaf levels of the tree. 1638 */ 1639 typedef struct xfs_bmbt_key { 1640 __be64 br_startoff; /* starting file offset */ 1641 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1642 1643 /* btree pointer type */ 1644 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1645 1646 1647 /* 1648 * Generic Btree block format definitions 1649 * 1650 * This is a combination of the actual format used on disk for short and long 1651 * format btrees. The first three fields are shared by both format, but the 1652 * pointers are different and should be used with care. 1653 * 1654 * To get the size of the actual short or long form headers please use the size 1655 * macros below. Never use sizeof(xfs_btree_block). 1656 * 1657 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1658 * with the crc feature bit, and all accesses to them must be conditional on 1659 * that flag. 1660 */ 1661 /* short form block header */ 1662 struct xfs_btree_block_shdr { 1663 __be32 bb_leftsib; 1664 __be32 bb_rightsib; 1665 1666 __be64 bb_blkno; 1667 __be64 bb_lsn; 1668 uuid_t bb_uuid; 1669 __be32 bb_owner; 1670 __le32 bb_crc; 1671 }; 1672 1673 /* long form block header */ 1674 struct xfs_btree_block_lhdr { 1675 __be64 bb_leftsib; 1676 __be64 bb_rightsib; 1677 1678 __be64 bb_blkno; 1679 __be64 bb_lsn; 1680 uuid_t bb_uuid; 1681 __be64 bb_owner; 1682 __le32 bb_crc; 1683 __be32 bb_pad; /* padding for alignment */ 1684 }; 1685 1686 struct xfs_btree_block { 1687 __be32 bb_magic; /* magic number for block type */ 1688 __be16 bb_level; /* 0 is a leaf */ 1689 __be16 bb_numrecs; /* current # of data records */ 1690 union { 1691 struct xfs_btree_block_shdr s; 1692 struct xfs_btree_block_lhdr l; 1693 } bb_u; /* rest */ 1694 }; 1695 1696 /* size of a short form block */ 1697 #define XFS_BTREE_SBLOCK_LEN \ 1698 (offsetof(struct xfs_btree_block, bb_u) + \ 1699 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1700 /* size of a long form block */ 1701 #define XFS_BTREE_LBLOCK_LEN \ 1702 (offsetof(struct xfs_btree_block, bb_u) + \ 1703 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1704 1705 /* sizes of CRC enabled btree blocks */ 1706 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1707 (offsetof(struct xfs_btree_block, bb_u) + \ 1708 sizeof(struct xfs_btree_block_shdr)) 1709 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1710 (offsetof(struct xfs_btree_block, bb_u) + \ 1711 sizeof(struct xfs_btree_block_lhdr)) 1712 1713 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1714 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1715 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1716 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1717 1718 /* 1719 * On-disk XFS access control list structure. 1720 */ 1721 struct xfs_acl_entry { 1722 __be32 ae_tag; 1723 __be32 ae_id; 1724 __be16 ae_perm; 1725 __be16 ae_pad; /* fill the implicit hole in the structure */ 1726 }; 1727 1728 struct xfs_acl { 1729 __be32 acl_cnt; 1730 struct xfs_acl_entry acl_entry[]; 1731 }; 1732 1733 /* 1734 * The number of ACL entries allowed is defined by the on-disk format. 1735 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1736 * limited only by the maximum size of the xattr that stores the information. 1737 */ 1738 #define XFS_ACL_MAX_ENTRIES(mp) \ 1739 (xfs_has_crc(mp) \ 1740 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1741 sizeof(struct xfs_acl_entry) \ 1742 : 25) 1743 1744 #define XFS_ACL_SIZE(cnt) \ 1745 (sizeof(struct xfs_acl) + \ 1746 sizeof(struct xfs_acl_entry) * cnt) 1747 1748 #define XFS_ACL_MAX_SIZE(mp) \ 1749 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1750 1751 1752 /* On-disk XFS extended attribute names */ 1753 #define SGI_ACL_FILE "SGI_ACL_FILE" 1754 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1755 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1756 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1757 1758 #endif /* __XFS_FORMAT_H__ */ 1759