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 typedef 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 } xfs_dsb_t; 267 268 269 /* 270 * Misc. Flags - warning - these will be cleared by xfs_repair unless 271 * a feature bit is set when the flag is used. 272 */ 273 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 274 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 275 276 /* 277 * define max. shared version we can interoperate with 278 */ 279 #define XFS_SB_MAX_SHARED_VN 0 280 281 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 282 283 /* 284 * The first XFS version we support is a v4 superblock with V2 directories. 285 */ 286 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) 287 { 288 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 289 return false; 290 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)) 291 return false; 292 293 /* check for unknown features in the fs */ 294 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 295 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 296 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 297 return false; 298 299 return true; 300 } 301 302 static inline bool xfs_sb_good_version(struct xfs_sb *sbp) 303 { 304 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) 305 return true; 306 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) 307 return xfs_sb_good_v4_features(sbp); 308 return false; 309 } 310 311 static inline bool xfs_sb_version_hasrealtime(struct xfs_sb *sbp) 312 { 313 return sbp->sb_rblocks > 0; 314 } 315 316 /* 317 * Detect a mismatched features2 field. Older kernels read/wrote 318 * this into the wrong slot, so to be safe we keep them in sync. 319 */ 320 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 321 { 322 return sbp->sb_bad_features2 != sbp->sb_features2; 323 } 324 325 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 326 { 327 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 328 } 329 330 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 331 { 332 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 333 } 334 335 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 336 { 337 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 338 } 339 340 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 341 { 342 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 343 } 344 345 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) 346 { 347 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 348 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); 349 } 350 351 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 352 { 353 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 354 } 355 356 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) 357 { 358 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 359 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); 360 } 361 362 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 363 { 364 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 365 } 366 367 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 368 { 369 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 370 } 371 372 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 373 { 374 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 375 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 376 } 377 378 /* 379 * sb_features2 bit version macros. 380 */ 381 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) 382 { 383 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 384 (xfs_sb_version_hasmorebits(sbp) && 385 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); 386 } 387 388 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) 389 { 390 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 391 (xfs_sb_version_hasmorebits(sbp) && 392 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); 393 } 394 395 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 396 { 397 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 398 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 399 } 400 401 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) 402 { 403 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; 404 if (!sbp->sb_features2) 405 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; 406 } 407 408 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) 409 { 410 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 411 (xfs_sb_version_hasmorebits(sbp) && 412 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); 413 } 414 415 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) 416 { 417 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 418 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 419 } 420 421 /* 422 * Extended v5 superblock feature masks. These are to be used for new v5 423 * superblock features only. 424 * 425 * Compat features are new features that old kernels will not notice or affect 426 * and so can mount read-write without issues. 427 * 428 * RO-Compat (read only) are features that old kernels can read but will break 429 * if they write. Hence only read-only mounts of such filesystems are allowed on 430 * kernels that don't support the feature bit. 431 * 432 * InCompat features are features which old kernels will not understand and so 433 * must not mount. 434 * 435 * Log-InCompat features are for changes to log formats or new transactions that 436 * can't be replayed on older kernels. The fields are set when the filesystem is 437 * mounted, and a clean unmount clears the fields. 438 */ 439 #define XFS_SB_FEAT_COMPAT_ALL 0 440 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 441 static inline bool 442 xfs_sb_has_compat_feature( 443 struct xfs_sb *sbp, 444 uint32_t feature) 445 { 446 return (sbp->sb_features_compat & feature) != 0; 447 } 448 449 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 450 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ 451 #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ 452 #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ 453 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 454 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 455 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 456 XFS_SB_FEAT_RO_COMPAT_REFLINK| \ 457 XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 458 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 459 static inline bool 460 xfs_sb_has_ro_compat_feature( 461 struct xfs_sb *sbp, 462 uint32_t feature) 463 { 464 return (sbp->sb_features_ro_compat & feature) != 0; 465 } 466 467 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 468 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 469 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 470 #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ 471 #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */ 472 #define XFS_SB_FEAT_INCOMPAT_ALL \ 473 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 474 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 475 XFS_SB_FEAT_INCOMPAT_META_UUID| \ 476 XFS_SB_FEAT_INCOMPAT_BIGTIME| \ 477 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR) 478 479 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 480 static inline bool 481 xfs_sb_has_incompat_feature( 482 struct xfs_sb *sbp, 483 uint32_t feature) 484 { 485 return (sbp->sb_features_incompat & feature) != 0; 486 } 487 488 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 489 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 490 static inline bool 491 xfs_sb_has_incompat_log_feature( 492 struct xfs_sb *sbp, 493 uint32_t feature) 494 { 495 return (sbp->sb_features_log_incompat & feature) != 0; 496 } 497 498 /* 499 * V5 superblock specific feature checks 500 */ 501 static inline bool xfs_sb_version_hascrc(struct xfs_sb *sbp) 502 { 503 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 504 } 505 506 /* 507 * v5 file systems support V3 inodes only, earlier file systems support 508 * v2 and v1 inodes. 509 */ 510 static inline bool xfs_sb_version_has_v3inode(struct xfs_sb *sbp) 511 { 512 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 513 } 514 515 static inline bool xfs_dinode_good_version(struct xfs_sb *sbp, 516 uint8_t version) 517 { 518 if (xfs_sb_version_has_v3inode(sbp)) 519 return version == 3; 520 return version == 1 || version == 2; 521 } 522 523 static inline bool xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 524 { 525 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 526 } 527 528 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 529 { 530 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 531 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 532 (xfs_sb_version_hasmorebits(sbp) && 533 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 534 } 535 536 static inline bool xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 537 { 538 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 539 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 540 } 541 542 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 543 { 544 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 545 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 546 } 547 548 /* 549 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 550 * is stored separately from the user-visible UUID; this allows the 551 * user-visible UUID to be changed on V5 filesystems which have a 552 * filesystem UUID stamped into every piece of metadata. 553 */ 554 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 555 { 556 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 557 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 558 } 559 560 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp) 561 { 562 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 563 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT); 564 } 565 566 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) 567 { 568 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 569 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); 570 } 571 572 static inline bool xfs_sb_version_hasbigtime(struct xfs_sb *sbp) 573 { 574 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 575 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME); 576 } 577 578 /* 579 * Inode btree block counter. We record the number of inobt and finobt blocks 580 * in the AGI header so that we can skip the finobt walk at mount time when 581 * setting up per-AG reservations. 582 */ 583 static inline bool xfs_sb_version_hasinobtcounts(struct xfs_sb *sbp) 584 { 585 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 586 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT); 587 } 588 589 static inline bool xfs_sb_version_needsrepair(struct xfs_sb *sbp) 590 { 591 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 592 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR); 593 } 594 595 /* 596 * end of superblock version macros 597 */ 598 599 static inline bool 600 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 601 { 602 return (ino == sbp->sb_uquotino || 603 ino == sbp->sb_gquotino || 604 ino == sbp->sb_pquotino); 605 } 606 607 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 608 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 609 610 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 611 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 612 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 613 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 614 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 615 616 /* 617 * File system sector to basic block conversions. 618 */ 619 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 620 621 /* 622 * File system block to basic block conversions. 623 */ 624 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 625 #define XFS_BB_TO_FSB(mp,bb) \ 626 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 627 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 628 629 /* 630 * File system block to byte conversions. 631 */ 632 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 633 #define XFS_B_TO_FSB(mp,b) \ 634 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 635 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 636 637 /* 638 * Allocation group header 639 * 640 * This is divided into three structures, placed in sequential 512-byte 641 * buffers after a copy of the superblock (also in a 512-byte buffer). 642 */ 643 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 644 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 645 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 646 #define XFS_AGF_VERSION 1 647 #define XFS_AGI_VERSION 1 648 649 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 650 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 651 652 /* 653 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the 654 * arrays below. 655 */ 656 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1) 657 658 /* 659 * The second word of agf_levels in the first a.g. overlaps the EFS 660 * superblock's magic number. Since the magic numbers valid for EFS 661 * are > 64k, our value cannot be confused for an EFS superblock's. 662 */ 663 664 typedef struct xfs_agf { 665 /* 666 * Common allocation group header information 667 */ 668 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 669 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 670 __be32 agf_seqno; /* sequence # starting from 0 */ 671 __be32 agf_length; /* size in blocks of a.g. */ 672 /* 673 * Freespace and rmap information 674 */ 675 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 676 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 677 678 __be32 agf_flfirst; /* first freelist block's index */ 679 __be32 agf_fllast; /* last freelist block's index */ 680 __be32 agf_flcount; /* count of blocks in freelist */ 681 __be32 agf_freeblks; /* total free blocks */ 682 683 __be32 agf_longest; /* longest free space */ 684 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 685 uuid_t agf_uuid; /* uuid of filesystem */ 686 687 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 688 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 689 690 __be32 agf_refcount_root; /* refcount tree root block */ 691 __be32 agf_refcount_level; /* refcount btree levels */ 692 693 /* 694 * reserve some contiguous space for future logged fields before we add 695 * the unlogged fields. This makes the range logging via flags and 696 * structure offsets much simpler. 697 */ 698 __be64 agf_spare64[14]; 699 700 /* unlogged fields, written during buffer writeback. */ 701 __be64 agf_lsn; /* last write sequence */ 702 __be32 agf_crc; /* crc of agf sector */ 703 __be32 agf_spare2; 704 705 /* structure must be padded to 64 bit alignment */ 706 } xfs_agf_t; 707 708 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 709 710 #define XFS_AGF_MAGICNUM 0x00000001 711 #define XFS_AGF_VERSIONNUM 0x00000002 712 #define XFS_AGF_SEQNO 0x00000004 713 #define XFS_AGF_LENGTH 0x00000008 714 #define XFS_AGF_ROOTS 0x00000010 715 #define XFS_AGF_LEVELS 0x00000020 716 #define XFS_AGF_FLFIRST 0x00000040 717 #define XFS_AGF_FLLAST 0x00000080 718 #define XFS_AGF_FLCOUNT 0x00000100 719 #define XFS_AGF_FREEBLKS 0x00000200 720 #define XFS_AGF_LONGEST 0x00000400 721 #define XFS_AGF_BTREEBLKS 0x00000800 722 #define XFS_AGF_UUID 0x00001000 723 #define XFS_AGF_RMAP_BLOCKS 0x00002000 724 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 725 #define XFS_AGF_REFCOUNT_ROOT 0x00008000 726 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000 727 #define XFS_AGF_SPARE64 0x00020000 728 #define XFS_AGF_NUM_BITS 18 729 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 730 731 #define XFS_AGF_FLAGS \ 732 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 733 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 734 { XFS_AGF_SEQNO, "SEQNO" }, \ 735 { XFS_AGF_LENGTH, "LENGTH" }, \ 736 { XFS_AGF_ROOTS, "ROOTS" }, \ 737 { XFS_AGF_LEVELS, "LEVELS" }, \ 738 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 739 { XFS_AGF_FLLAST, "FLLAST" }, \ 740 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 741 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 742 { XFS_AGF_LONGEST, "LONGEST" }, \ 743 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 744 { XFS_AGF_UUID, "UUID" }, \ 745 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 746 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 747 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 748 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 749 { XFS_AGF_SPARE64, "SPARE64" } 750 751 /* disk block (xfs_daddr_t) in the AG */ 752 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 753 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 754 755 /* 756 * Size of the unlinked inode hash table in the agi. 757 */ 758 #define XFS_AGI_UNLINKED_BUCKETS 64 759 760 typedef struct xfs_agi { 761 /* 762 * Common allocation group header information 763 */ 764 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 765 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 766 __be32 agi_seqno; /* sequence # starting from 0 */ 767 __be32 agi_length; /* size in blocks of a.g. */ 768 /* 769 * Inode information 770 * Inodes are mapped by interpreting the inode number, so no 771 * mapping data is needed here. 772 */ 773 __be32 agi_count; /* count of allocated inodes */ 774 __be32 agi_root; /* root of inode btree */ 775 __be32 agi_level; /* levels in inode btree */ 776 __be32 agi_freecount; /* number of free inodes */ 777 778 __be32 agi_newino; /* new inode just allocated */ 779 __be32 agi_dirino; /* last directory inode chunk */ 780 /* 781 * Hash table of inodes which have been unlinked but are 782 * still being referenced. 783 */ 784 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 785 /* 786 * This marks the end of logging region 1 and start of logging region 2. 787 */ 788 uuid_t agi_uuid; /* uuid of filesystem */ 789 __be32 agi_crc; /* crc of agi sector */ 790 __be32 agi_pad32; 791 __be64 agi_lsn; /* last write sequence */ 792 793 __be32 agi_free_root; /* root of the free inode btree */ 794 __be32 agi_free_level;/* levels in free inode btree */ 795 796 __be32 agi_iblocks; /* inobt blocks used */ 797 __be32 agi_fblocks; /* finobt blocks used */ 798 799 /* structure must be padded to 64 bit alignment */ 800 } xfs_agi_t; 801 802 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 803 804 #define XFS_AGI_MAGICNUM (1 << 0) 805 #define XFS_AGI_VERSIONNUM (1 << 1) 806 #define XFS_AGI_SEQNO (1 << 2) 807 #define XFS_AGI_LENGTH (1 << 3) 808 #define XFS_AGI_COUNT (1 << 4) 809 #define XFS_AGI_ROOT (1 << 5) 810 #define XFS_AGI_LEVEL (1 << 6) 811 #define XFS_AGI_FREECOUNT (1 << 7) 812 #define XFS_AGI_NEWINO (1 << 8) 813 #define XFS_AGI_DIRINO (1 << 9) 814 #define XFS_AGI_UNLINKED (1 << 10) 815 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 816 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 817 #define XFS_AGI_FREE_ROOT (1 << 11) 818 #define XFS_AGI_FREE_LEVEL (1 << 12) 819 #define XFS_AGI_IBLOCKS (1 << 13) /* both inobt/finobt block counters */ 820 #define XFS_AGI_NUM_BITS_R2 14 821 822 /* disk block (xfs_daddr_t) in the AG */ 823 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 824 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 825 826 /* 827 * The third a.g. block contains the a.g. freelist, an array 828 * of block pointers to blocks owned by the allocation btree code. 829 */ 830 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 831 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 832 #define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr)) 833 834 struct xfs_agfl { 835 __be32 agfl_magicnum; 836 __be32 agfl_seqno; 837 uuid_t agfl_uuid; 838 __be64 agfl_lsn; 839 __be32 agfl_crc; 840 } __attribute__((packed)); 841 842 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 843 844 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 845 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 846 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 847 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 848 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 849 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 850 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 851 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 852 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 853 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 854 855 /* 856 * For checking for bad ranges of xfs_daddr_t's, covering multiple 857 * allocation groups or a single xfs_daddr_t that's a superblock copy. 858 */ 859 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 860 ((len) == 1 ? \ 861 ASSERT((d) == XFS_SB_DADDR || \ 862 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 863 ASSERT(xfs_daddr_to_agno(mp, d) == \ 864 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 865 866 /* 867 * XFS Timestamps 868 * ============== 869 * 870 * Traditional ondisk inode timestamps consist of signed 32-bit counters for 871 * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC 872 * 1970, which means that the timestamp epoch is the same as the Unix epoch. 873 * Therefore, the ondisk min and max defined here can be used directly to 874 * constrain the incore timestamps on a Unix system. Note that we actually 875 * encode a __be64 value on disk. 876 * 877 * When the bigtime feature is enabled, ondisk inode timestamps become an 878 * unsigned 64-bit nanoseconds counter. This means that the bigtime inode 879 * timestamp epoch is the start of the classic timestamp range, which is 880 * Dec 31 20:45:52 UTC 1901. Because the epochs are not the same, callers 881 * /must/ use the bigtime conversion functions when encoding and decoding raw 882 * timestamps. 883 */ 884 typedef __be64 xfs_timestamp_t; 885 886 /* Legacy timestamp encoding format. */ 887 struct xfs_legacy_timestamp { 888 __be32 t_sec; /* timestamp seconds */ 889 __be32 t_nsec; /* timestamp nanoseconds */ 890 }; 891 892 /* 893 * Smallest possible ondisk seconds value with traditional timestamps. This 894 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901. 895 */ 896 #define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN) 897 898 /* 899 * Largest possible ondisk seconds value with traditional timestamps. This 900 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038. 901 */ 902 #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) 903 904 /* 905 * Smallest possible ondisk seconds value with bigtime timestamps. This 906 * corresponds (after conversion to a Unix timestamp) with the traditional 907 * minimum timestamp of Dec 13 20:45:52 UTC 1901. 908 */ 909 #define XFS_BIGTIME_TIME_MIN ((int64_t)0) 910 911 /* 912 * Largest supported ondisk seconds value with bigtime timestamps. This 913 * corresponds (after conversion to a Unix timestamp) with an incore timestamp 914 * of Jul 2 20:20:24 UTC 2486. 915 * 916 * We round down the ondisk limit so that the bigtime quota and inode max 917 * timestamps will be the same. 918 */ 919 #define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL)) 920 921 /* 922 * Bigtime epoch is set exactly to the minimum time value that a traditional 923 * 32-bit timestamp can represent when using the Unix epoch as a reference. 924 * Hence the Unix epoch is at a fixed offset into the supported bigtime 925 * timestamp range. 926 * 927 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS 928 * timestamp can represent so we will not lose any fidelity in converting 929 * to/from unix and bigtime timestamps. 930 * 931 * The following conversion factor converts a seconds counter from the Unix 932 * epoch to the bigtime epoch. 933 */ 934 #define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN) 935 936 /* Convert a timestamp from the Unix epoch to the bigtime epoch. */ 937 static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds) 938 { 939 return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET; 940 } 941 942 /* Convert a timestamp from the bigtime epoch to the Unix epoch. */ 943 static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds) 944 { 945 return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET; 946 } 947 948 /* 949 * On-disk inode structure. 950 * 951 * This is just the header or "dinode core", the inode is expanded to fill a 952 * variable size the leftover area split into a data and an attribute fork. 953 * The format of the data and attribute fork depends on the format of the 954 * inode as indicated by di_format and di_aformat. To access the data and 955 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 956 * below. 957 * 958 * There is a very similar struct xfs_log_dinode which matches the layout of 959 * this structure, but is kept in native format instead of big endian. 960 * 961 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 962 * padding field for v3 inodes. 963 */ 964 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 965 typedef struct xfs_dinode { 966 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 967 __be16 di_mode; /* mode and type of file */ 968 __u8 di_version; /* inode version */ 969 __u8 di_format; /* format of di_c data */ 970 __be16 di_onlink; /* old number of links to file */ 971 __be32 di_uid; /* owner's user id */ 972 __be32 di_gid; /* owner's group id */ 973 __be32 di_nlink; /* number of links to file */ 974 __be16 di_projid_lo; /* lower part of owner's project id */ 975 __be16 di_projid_hi; /* higher part owner's project id */ 976 __u8 di_pad[6]; /* unused, zeroed space */ 977 __be16 di_flushiter; /* incremented on flush */ 978 xfs_timestamp_t di_atime; /* time last accessed */ 979 xfs_timestamp_t di_mtime; /* time last modified */ 980 xfs_timestamp_t di_ctime; /* time created/inode modified */ 981 __be64 di_size; /* number of bytes in file */ 982 __be64 di_nblocks; /* # of direct & btree blocks used */ 983 __be32 di_extsize; /* basic/minimum extent size for file */ 984 __be32 di_nextents; /* number of extents in data fork */ 985 __be16 di_anextents; /* number of extents in attribute fork*/ 986 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 987 __s8 di_aformat; /* format of attr fork's data */ 988 __be32 di_dmevmask; /* DMIG event mask */ 989 __be16 di_dmstate; /* DMIG state info */ 990 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 991 __be32 di_gen; /* generation number */ 992 993 /* di_next_unlinked is the only non-core field in the old dinode */ 994 __be32 di_next_unlinked;/* agi unlinked list ptr */ 995 996 /* start of the extended dinode, writable fields */ 997 __le32 di_crc; /* CRC of the inode */ 998 __be64 di_changecount; /* number of attribute changes */ 999 __be64 di_lsn; /* flush sequence */ 1000 __be64 di_flags2; /* more random flags */ 1001 __be32 di_cowextsize; /* basic cow extent size for file */ 1002 __u8 di_pad2[12]; /* more padding for future expansion */ 1003 1004 /* fields only written to during inode creation */ 1005 xfs_timestamp_t di_crtime; /* time created */ 1006 __be64 di_ino; /* inode number */ 1007 uuid_t di_uuid; /* UUID of the filesystem */ 1008 1009 /* structure must be padded to 64 bit alignment */ 1010 } xfs_dinode_t; 1011 1012 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 1013 1014 #define DI_MAX_FLUSH 0xffff 1015 1016 /* 1017 * Size of the core inode on disk. Version 1 and 2 inodes have 1018 * the same size, but version 3 has grown a few additional fields. 1019 */ 1020 static inline uint xfs_dinode_size(int version) 1021 { 1022 if (version == 3) 1023 return sizeof(struct xfs_dinode); 1024 return offsetof(struct xfs_dinode, di_crc); 1025 } 1026 1027 /* 1028 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 1029 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 1030 */ 1031 #define XFS_MAXLINK ((1U << 31) - 1U) 1032 1033 /* 1034 * Values for di_format 1035 * 1036 * This enum is used in string mapping in xfs_trace.h; please keep the 1037 * TRACE_DEFINE_ENUMs for it up to date. 1038 */ 1039 enum xfs_dinode_fmt { 1040 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 1041 XFS_DINODE_FMT_LOCAL, /* bulk data */ 1042 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 1043 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 1044 XFS_DINODE_FMT_UUID /* added long ago, but never used */ 1045 }; 1046 1047 #define XFS_INODE_FORMAT_STR \ 1048 { XFS_DINODE_FMT_DEV, "dev" }, \ 1049 { XFS_DINODE_FMT_LOCAL, "local" }, \ 1050 { XFS_DINODE_FMT_EXTENTS, "extent" }, \ 1051 { XFS_DINODE_FMT_BTREE, "btree" }, \ 1052 { XFS_DINODE_FMT_UUID, "uuid" } 1053 1054 /* 1055 * Inode minimum and maximum sizes. 1056 */ 1057 #define XFS_DINODE_MIN_LOG 8 1058 #define XFS_DINODE_MAX_LOG 11 1059 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 1060 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 1061 1062 /* 1063 * Inode size for given fs. 1064 */ 1065 #define XFS_DINODE_SIZE(sbp) \ 1066 (xfs_sb_version_has_v3inode(sbp) ? \ 1067 sizeof(struct xfs_dinode) : \ 1068 offsetof(struct xfs_dinode, di_crc)) 1069 #define XFS_LITINO(mp) \ 1070 ((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(&(mp)->m_sb)) 1071 1072 /* 1073 * Inode data & attribute fork sizes, per inode. 1074 */ 1075 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 1076 1077 #define XFS_DFORK_DSIZE(dip,mp) \ 1078 ((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp)) 1079 #define XFS_DFORK_ASIZE(dip,mp) \ 1080 ((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0) 1081 #define XFS_DFORK_SIZE(dip,mp,w) \ 1082 ((w) == XFS_DATA_FORK ? \ 1083 XFS_DFORK_DSIZE(dip, mp) : \ 1084 XFS_DFORK_ASIZE(dip, mp)) 1085 1086 #define XFS_DFORK_MAXEXT(dip, mp, w) \ 1087 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec)) 1088 1089 /* 1090 * Return pointers to the data or attribute forks. 1091 */ 1092 #define XFS_DFORK_DPTR(dip) \ 1093 ((char *)dip + xfs_dinode_size(dip->di_version)) 1094 #define XFS_DFORK_APTR(dip) \ 1095 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 1096 #define XFS_DFORK_PTR(dip,w) \ 1097 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 1098 1099 #define XFS_DFORK_FORMAT(dip,w) \ 1100 ((w) == XFS_DATA_FORK ? \ 1101 (dip)->di_format : \ 1102 (dip)->di_aformat) 1103 #define XFS_DFORK_NEXTENTS(dip,w) \ 1104 ((w) == XFS_DATA_FORK ? \ 1105 be32_to_cpu((dip)->di_nextents) : \ 1106 be16_to_cpu((dip)->di_anextents)) 1107 1108 /* 1109 * For block and character special files the 32bit dev_t is stored at the 1110 * beginning of the data fork. 1111 */ 1112 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1113 { 1114 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1115 } 1116 1117 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1118 { 1119 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1120 } 1121 1122 /* 1123 * Values for di_flags 1124 */ 1125 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1126 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1127 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1128 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1129 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1130 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1131 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1132 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1133 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1134 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1135 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1136 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1137 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1138 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1139 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1140 /* Do not use bit 15, di_flags is legacy and unchanging now */ 1141 1142 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1143 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1144 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1145 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1146 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1147 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1148 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1149 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1150 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1151 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1152 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1153 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1154 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1155 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1156 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1157 1158 #define XFS_DIFLAG_ANY \ 1159 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1160 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1161 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1162 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1163 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1164 1165 /* 1166 * Values for di_flags2 These start by being exposed to userspace in the upper 1167 * 16 bits of the XFS_XFLAG_s range. 1168 */ 1169 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1170 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ 1171 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ 1172 #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */ 1173 1174 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1175 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) 1176 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) 1177 #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT) 1178 1179 #define XFS_DIFLAG2_ANY \ 1180 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ 1181 XFS_DIFLAG2_BIGTIME) 1182 1183 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) 1184 { 1185 return dip->di_version >= 3 && 1186 (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME)); 1187 } 1188 1189 /* 1190 * Inode number format: 1191 * low inopblog bits - offset in block 1192 * next agblklog bits - block number in ag 1193 * next agno_log bits - ag number 1194 * high agno_log-agblklog-inopblog bits - 0 1195 */ 1196 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1) 1197 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1198 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1199 #define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log) 1200 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1201 #define XFS_INO_BITS(mp) \ 1202 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1203 #define XFS_INO_TO_AGNO(mp,i) \ 1204 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1205 #define XFS_INO_TO_AGINO(mp,i) \ 1206 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1207 #define XFS_INO_TO_AGBNO(mp,i) \ 1208 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1209 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1210 #define XFS_INO_TO_OFFSET(mp,i) \ 1211 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1212 #define XFS_INO_TO_FSB(mp,i) \ 1213 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1214 #define XFS_AGINO_TO_INO(mp,a,i) \ 1215 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1216 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1217 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1218 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1219 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1220 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1221 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1222 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1223 1224 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1225 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1226 1227 /* 1228 * RealTime Device format definitions 1229 */ 1230 1231 /* Min and max rt extent sizes, specified in bytes */ 1232 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1233 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1234 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1235 1236 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1237 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1238 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1239 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1240 1241 /* 1242 * RT Summary and bit manipulation macros. 1243 */ 1244 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1245 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1246 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1247 #define XFS_SUMPTR(mp,bp,so) \ 1248 ((xfs_suminfo_t *)((bp)->b_addr + \ 1249 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1250 1251 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1252 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1253 #define XFS_BITTOWORD(mp,bi) \ 1254 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1255 1256 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1257 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1258 1259 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1260 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1261 1262 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1263 1264 /* 1265 * Dquot and dquot block format definitions 1266 */ 1267 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1268 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */ 1269 1270 #define XFS_DQTYPE_USER 0x01 /* user dquot record */ 1271 #define XFS_DQTYPE_PROJ 0x02 /* project dquot record */ 1272 #define XFS_DQTYPE_GROUP 0x04 /* group dquot record */ 1273 #define XFS_DQTYPE_BIGTIME 0x80 /* large expiry timestamps */ 1274 1275 /* bitmask to determine if this is a user/group/project dquot */ 1276 #define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \ 1277 XFS_DQTYPE_PROJ | \ 1278 XFS_DQTYPE_GROUP) 1279 1280 #define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \ 1281 XFS_DQTYPE_BIGTIME) 1282 1283 /* 1284 * XFS Quota Timers 1285 * ================ 1286 * 1287 * Traditional quota grace period expiration timers are an unsigned 32-bit 1288 * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970. 1289 * Note that an expiration value of zero means that the quota limit has not 1290 * been reached, and therefore no expiration has been set. Therefore, the 1291 * ondisk min and max defined here can be used directly to constrain the incore 1292 * quota expiration timestamps on a Unix system. 1293 * 1294 * When bigtime is enabled, we trade two bits of precision to expand the 1295 * expiration timeout range to match that of big inode timestamps. The min and 1296 * max recorded here are the on-disk limits, not a Unix timestamp. 1297 * 1298 * The grace period for each quota type is stored in the root dquot (id = 0) 1299 * and is applied to a non-root dquot when it exceeds the soft or hard limits. 1300 * The length of quota grace periods are unsigned 32-bit quantities measured in 1301 * units of seconds. A value of zero means to use the default period. 1302 */ 1303 1304 /* 1305 * Smallest possible ondisk quota expiration value with traditional timestamps. 1306 * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970. 1307 */ 1308 #define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1) 1309 1310 /* 1311 * Largest possible ondisk quota expiration value with traditional timestamps. 1312 * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106. 1313 */ 1314 #define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX) 1315 1316 /* 1317 * Smallest possible ondisk quota expiration value with bigtime timestamps. 1318 * This corresponds (after conversion to a Unix timestamp) with the incore 1319 * expiration of Jan 1 00:00:04 UTC 1970. 1320 */ 1321 #define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN) 1322 1323 /* 1324 * Largest supported ondisk quota expiration value with bigtime timestamps. 1325 * This corresponds (after conversion to a Unix timestamp) with an incore 1326 * expiration of Jul 2 20:20:24 UTC 2486. 1327 * 1328 * The ondisk field supports values up to -1U, which corresponds to an incore 1329 * expiration in 2514. This is beyond the maximum the bigtime inode timestamp, 1330 * so we cap the maximum bigtime quota expiration to the max inode timestamp. 1331 */ 1332 #define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U) 1333 1334 /* 1335 * The following conversion factors assist in converting a quota expiration 1336 * timestamp between the incore and ondisk formats. 1337 */ 1338 #define XFS_DQ_BIGTIME_SHIFT (2) 1339 #define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1) 1340 1341 /* Convert an incore quota expiration timestamp to an ondisk bigtime value. */ 1342 static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds) 1343 { 1344 /* 1345 * Round the expiration timestamp up to the nearest bigtime timestamp 1346 * that we can store, to give users the most time to fix problems. 1347 */ 1348 return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >> 1349 XFS_DQ_BIGTIME_SHIFT; 1350 } 1351 1352 /* Convert an ondisk bigtime quota expiration value to an incore timestamp. */ 1353 static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds) 1354 { 1355 return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT; 1356 } 1357 1358 /* 1359 * Default quota grace periods, ranging from zero (use the compiled defaults) 1360 * to ~136 years. These are applied to a non-root dquot that has exceeded 1361 * either limit. 1362 */ 1363 #define XFS_DQ_GRACE_MIN ((int64_t)0) 1364 #define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX) 1365 1366 /* 1367 * This is the main portion of the on-disk representation of quota information 1368 * for a user. We pad this with some more expansion room to construct the on 1369 * disk structure. 1370 */ 1371 struct xfs_disk_dquot { 1372 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1373 __u8 d_version; /* dquot version */ 1374 __u8 d_type; /* XFS_DQTYPE_USER/PROJ/GROUP */ 1375 __be32 d_id; /* user,project,group id */ 1376 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1377 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1378 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1379 __be64 d_ino_softlimit;/* preferred inode limit */ 1380 __be64 d_bcount; /* disk blocks owned by the user */ 1381 __be64 d_icount; /* inodes owned by the user */ 1382 __be32 d_itimer; /* zero if within inode limits if not, 1383 this is when we refuse service */ 1384 __be32 d_btimer; /* similar to above; for disk blocks */ 1385 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1386 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1387 __be32 d_pad0; /* 64 bit align */ 1388 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1389 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1390 __be64 d_rtbcount; /* realtime blocks owned */ 1391 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1392 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1393 __be16 d_pad; 1394 }; 1395 1396 /* 1397 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1398 * carrying the unnecessary padding would be a waste of memory. 1399 */ 1400 typedef struct xfs_dqblk { 1401 struct xfs_disk_dquot dd_diskdq; /* portion living incore as well */ 1402 char dd_fill[4];/* filling for posterity */ 1403 1404 /* 1405 * These two are only present on filesystems with the CRC bits set. 1406 */ 1407 __be32 dd_crc; /* checksum */ 1408 __be64 dd_lsn; /* last modification in log */ 1409 uuid_t dd_uuid; /* location information */ 1410 } xfs_dqblk_t; 1411 1412 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1413 1414 /* 1415 * This defines the unit of allocation of dquots. 1416 * 1417 * Currently, it is just one file system block, and a 4K blk contains 30 1418 * (136 * 30 = 4080) dquots. It's probably not worth trying to make 1419 * this more dynamic. 1420 * 1421 * However, if this number is changed, we have to make sure that we don't 1422 * implicitly assume that we do allocations in chunks of a single filesystem 1423 * block in the dquot/xqm code. 1424 * 1425 * This is part of the ondisk format because the structure size is not a power 1426 * of two, which leaves slack at the end of the disk block. 1427 */ 1428 #define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1 1429 1430 /* 1431 * Remote symlink format and access functions. 1432 */ 1433 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1434 1435 struct xfs_dsymlink_hdr { 1436 __be32 sl_magic; 1437 __be32 sl_offset; 1438 __be32 sl_bytes; 1439 __be32 sl_crc; 1440 uuid_t sl_uuid; 1441 __be64 sl_owner; 1442 __be64 sl_blkno; 1443 __be64 sl_lsn; 1444 }; 1445 1446 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1447 1448 #define XFS_SYMLINK_MAXLEN 1024 1449 /* 1450 * The maximum pathlen is 1024 bytes. Since the minimum file system 1451 * blocksize is 512 bytes, we can get a max of 3 extents back from 1452 * bmapi when crc headers are taken into account. 1453 */ 1454 #define XFS_SYMLINK_MAPS 3 1455 1456 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1457 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1458 sizeof(struct xfs_dsymlink_hdr) : 0)) 1459 1460 1461 /* 1462 * Allocation Btree format definitions 1463 * 1464 * There are two on-disk btrees, one sorted by blockno and one sorted 1465 * by blockcount and blockno. All blocks look the same to make the code 1466 * simpler; if we have time later, we'll make the optimizations. 1467 */ 1468 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1469 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1470 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1471 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1472 1473 /* 1474 * Data record/key structure 1475 */ 1476 typedef struct xfs_alloc_rec { 1477 __be32 ar_startblock; /* starting block number */ 1478 __be32 ar_blockcount; /* count of free blocks */ 1479 } xfs_alloc_rec_t, xfs_alloc_key_t; 1480 1481 typedef struct xfs_alloc_rec_incore { 1482 xfs_agblock_t ar_startblock; /* starting block number */ 1483 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1484 } xfs_alloc_rec_incore_t; 1485 1486 /* btree pointer type */ 1487 typedef __be32 xfs_alloc_ptr_t; 1488 1489 /* 1490 * Block numbers in the AG: 1491 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1492 */ 1493 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1494 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1495 1496 1497 /* 1498 * Inode Allocation Btree format definitions 1499 * 1500 * There is a btree for the inode map per allocation group. 1501 */ 1502 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1503 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1504 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1505 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1506 1507 typedef uint64_t xfs_inofree_t; 1508 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1509 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1510 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1511 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1512 1513 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1514 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t)) 1515 #define XFS_INODES_PER_HOLEMASK_BIT \ 1516 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t))) 1517 1518 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1519 { 1520 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1521 } 1522 1523 /* 1524 * The on-disk inode record structure has two formats. The original "full" 1525 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1526 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1527 * count. 1528 * 1529 * The holemask of the sparse record format allows an inode chunk to have holes 1530 * that refer to blocks not owned by the inode record. This facilitates inode 1531 * allocation in the event of severe free space fragmentation. 1532 */ 1533 typedef struct xfs_inobt_rec { 1534 __be32 ir_startino; /* starting inode number */ 1535 union { 1536 struct { 1537 __be32 ir_freecount; /* count of free inodes */ 1538 } f; 1539 struct { 1540 __be16 ir_holemask;/* hole mask for sparse chunks */ 1541 __u8 ir_count; /* total inode count */ 1542 __u8 ir_freecount; /* count of free inodes */ 1543 } sp; 1544 } ir_u; 1545 __be64 ir_free; /* free inode mask */ 1546 } xfs_inobt_rec_t; 1547 1548 typedef struct xfs_inobt_rec_incore { 1549 xfs_agino_t ir_startino; /* starting inode number */ 1550 uint16_t ir_holemask; /* hole mask for sparse chunks */ 1551 uint8_t ir_count; /* total inode count */ 1552 uint8_t ir_freecount; /* count of free inodes (set bits) */ 1553 xfs_inofree_t ir_free; /* free inode mask */ 1554 } xfs_inobt_rec_incore_t; 1555 1556 static inline bool xfs_inobt_issparse(uint16_t holemask) 1557 { 1558 /* non-zero holemask represents a sparse rec. */ 1559 return holemask; 1560 } 1561 1562 /* 1563 * Key structure 1564 */ 1565 typedef struct xfs_inobt_key { 1566 __be32 ir_startino; /* starting inode number */ 1567 } xfs_inobt_key_t; 1568 1569 /* btree pointer type */ 1570 typedef __be32 xfs_inobt_ptr_t; 1571 1572 /* 1573 * block numbers in the AG. 1574 */ 1575 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1576 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1577 1578 /* 1579 * Reverse mapping btree format definitions 1580 * 1581 * There is a btree for the reverse map per allocation group 1582 */ 1583 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1584 1585 /* 1586 * Ownership info for an extent. This is used to create reverse-mapping 1587 * entries. 1588 */ 1589 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1590 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1591 struct xfs_owner_info { 1592 uint64_t oi_owner; 1593 xfs_fileoff_t oi_offset; 1594 unsigned int oi_flags; 1595 }; 1596 1597 /* 1598 * Special owner types. 1599 * 1600 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1601 * to tell us we have a special owner value. We use these for static metadata 1602 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1603 */ 1604 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1605 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1606 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1607 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1608 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1609 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1610 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1611 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1612 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1613 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1614 1615 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1616 1617 /* 1618 * Data record structure 1619 */ 1620 struct xfs_rmap_rec { 1621 __be32 rm_startblock; /* extent start block */ 1622 __be32 rm_blockcount; /* extent length */ 1623 __be64 rm_owner; /* extent owner */ 1624 __be64 rm_offset; /* offset within the owner */ 1625 }; 1626 1627 /* 1628 * rmap btree record 1629 * rm_offset:63 is the attribute fork flag 1630 * rm_offset:62 is the bmbt block flag 1631 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1632 * rm_offset:54-60 aren't used and should be zero 1633 * rm_offset:0-53 is the block offset within the inode 1634 */ 1635 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63) 1636 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62) 1637 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61) 1638 1639 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U) 1640 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1641 XFS_RMAP_OFF_BMBT_BLOCK | \ 1642 XFS_RMAP_OFF_UNWRITTEN) 1643 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL) 1644 1645 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1646 1647 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1648 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1649 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1650 1651 #define RMAPBT_STARTBLOCK_BITLEN 32 1652 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1653 #define RMAPBT_OWNER_BITLEN 64 1654 #define RMAPBT_ATTRFLAG_BITLEN 1 1655 #define RMAPBT_BMBTFLAG_BITLEN 1 1656 #define RMAPBT_EXNTFLAG_BITLEN 1 1657 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1658 #define RMAPBT_OFFSET_BITLEN 54 1659 1660 #define XFS_RMAP_ATTR_FORK (1 << 0) 1661 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1662 #define XFS_RMAP_UNWRITTEN (1 << 2) 1663 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1664 XFS_RMAP_BMBT_BLOCK) 1665 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1666 struct xfs_rmap_irec { 1667 xfs_agblock_t rm_startblock; /* extent start block */ 1668 xfs_extlen_t rm_blockcount; /* extent length */ 1669 uint64_t rm_owner; /* extent owner */ 1670 uint64_t rm_offset; /* offset within the owner */ 1671 unsigned int rm_flags; /* state flags */ 1672 }; 1673 1674 /* 1675 * Key structure 1676 * 1677 * We don't use the length for lookups 1678 */ 1679 struct xfs_rmap_key { 1680 __be32 rm_startblock; /* extent start block */ 1681 __be64 rm_owner; /* extent owner */ 1682 __be64 rm_offset; /* offset within the owner */ 1683 } __attribute__((packed)); 1684 1685 /* btree pointer type */ 1686 typedef __be32 xfs_rmap_ptr_t; 1687 1688 #define XFS_RMAP_BLOCK(mp) \ 1689 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1690 XFS_FIBT_BLOCK(mp) + 1 : \ 1691 XFS_IBT_BLOCK(mp) + 1) 1692 1693 /* 1694 * Reference Count Btree format definitions 1695 * 1696 */ 1697 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1698 1699 unsigned int xfs_refc_block(struct xfs_mount *mp); 1700 1701 /* 1702 * Data record/key structure 1703 * 1704 * Each record associates a range of physical blocks (starting at 1705 * rc_startblock and ending rc_blockcount blocks later) with a reference 1706 * count (rc_refcount). Extents that are being used to stage a copy on 1707 * write (CoW) operation are recorded in the refcount btree with a 1708 * refcount of 1. All other records must have a refcount > 1 and must 1709 * track an extent mapped only by file data forks. 1710 * 1711 * Extents with a single owner (attributes, metadata, non-shared file 1712 * data) are not tracked here. Free space is also not tracked here. 1713 * This is consistent with pre-reflink XFS. 1714 */ 1715 1716 /* 1717 * Extents that are being used to stage a copy on write are stored 1718 * in the refcount btree with a refcount of 1 and the upper bit set 1719 * on the startblock. This speeds up mount time deletion of stale 1720 * staging extents because they're all at the right side of the tree. 1721 */ 1722 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) 1723 #define REFCNTBT_COWFLAG_BITLEN 1 1724 #define REFCNTBT_AGBLOCK_BITLEN 31 1725 1726 struct xfs_refcount_rec { 1727 __be32 rc_startblock; /* starting block number */ 1728 __be32 rc_blockcount; /* count of blocks */ 1729 __be32 rc_refcount; /* number of inodes linked here */ 1730 }; 1731 1732 struct xfs_refcount_key { 1733 __be32 rc_startblock; /* starting block number */ 1734 }; 1735 1736 struct xfs_refcount_irec { 1737 xfs_agblock_t rc_startblock; /* starting block number */ 1738 xfs_extlen_t rc_blockcount; /* count of free blocks */ 1739 xfs_nlink_t rc_refcount; /* number of inodes linked here */ 1740 }; 1741 1742 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1743 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1744 1745 /* btree pointer type */ 1746 typedef __be32 xfs_refcount_ptr_t; 1747 1748 1749 /* 1750 * BMAP Btree format definitions 1751 * 1752 * This includes both the root block definition that sits inside an inode fork 1753 * and the record/pointer formats for the leaf/node in the blocks. 1754 */ 1755 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1756 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1757 1758 /* 1759 * Bmap root header, on-disk form only. 1760 */ 1761 typedef struct xfs_bmdr_block { 1762 __be16 bb_level; /* 0 is a leaf */ 1763 __be16 bb_numrecs; /* current # of data records */ 1764 } xfs_bmdr_block_t; 1765 1766 /* 1767 * Bmap btree record and extent descriptor. 1768 * l0:63 is an extent flag (value 1 indicates non-normal). 1769 * l0:9-62 are startoff. 1770 * l0:0-8 and l1:21-63 are startblock. 1771 * l1:0-20 are blockcount. 1772 */ 1773 #define BMBT_EXNTFLAG_BITLEN 1 1774 #define BMBT_STARTOFF_BITLEN 54 1775 #define BMBT_STARTBLOCK_BITLEN 52 1776 #define BMBT_BLOCKCOUNT_BITLEN 21 1777 1778 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1) 1779 #define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1) 1780 1781 /* 1782 * bmbt records have a file offset (block) field that is 54 bits wide, so this 1783 * is the largest xfs_fileoff_t that we ever expect to see. 1784 */ 1785 #define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK) 1786 1787 typedef struct xfs_bmbt_rec { 1788 __be64 l0, l1; 1789 } xfs_bmbt_rec_t; 1790 1791 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1792 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1793 1794 /* 1795 * Values and macros for delayed-allocation startblock fields. 1796 */ 1797 #define STARTBLOCKVALBITS 17 1798 #define STARTBLOCKMASKBITS (15 + 20) 1799 #define STARTBLOCKMASK \ 1800 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1801 1802 static inline int isnullstartblock(xfs_fsblock_t x) 1803 { 1804 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1805 } 1806 1807 static inline xfs_fsblock_t nullstartblock(int k) 1808 { 1809 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1810 return STARTBLOCKMASK | (k); 1811 } 1812 1813 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1814 { 1815 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1816 } 1817 1818 /* 1819 * Key structure for non-leaf levels of the tree. 1820 */ 1821 typedef struct xfs_bmbt_key { 1822 __be64 br_startoff; /* starting file offset */ 1823 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1824 1825 /* btree pointer type */ 1826 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1827 1828 1829 /* 1830 * Generic Btree block format definitions 1831 * 1832 * This is a combination of the actual format used on disk for short and long 1833 * format btrees. The first three fields are shared by both format, but the 1834 * pointers are different and should be used with care. 1835 * 1836 * To get the size of the actual short or long form headers please use the size 1837 * macros below. Never use sizeof(xfs_btree_block). 1838 * 1839 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1840 * with the crc feature bit, and all accesses to them must be conditional on 1841 * that flag. 1842 */ 1843 /* short form block header */ 1844 struct xfs_btree_block_shdr { 1845 __be32 bb_leftsib; 1846 __be32 bb_rightsib; 1847 1848 __be64 bb_blkno; 1849 __be64 bb_lsn; 1850 uuid_t bb_uuid; 1851 __be32 bb_owner; 1852 __le32 bb_crc; 1853 }; 1854 1855 /* long form block header */ 1856 struct xfs_btree_block_lhdr { 1857 __be64 bb_leftsib; 1858 __be64 bb_rightsib; 1859 1860 __be64 bb_blkno; 1861 __be64 bb_lsn; 1862 uuid_t bb_uuid; 1863 __be64 bb_owner; 1864 __le32 bb_crc; 1865 __be32 bb_pad; /* padding for alignment */ 1866 }; 1867 1868 struct xfs_btree_block { 1869 __be32 bb_magic; /* magic number for block type */ 1870 __be16 bb_level; /* 0 is a leaf */ 1871 __be16 bb_numrecs; /* current # of data records */ 1872 union { 1873 struct xfs_btree_block_shdr s; 1874 struct xfs_btree_block_lhdr l; 1875 } bb_u; /* rest */ 1876 }; 1877 1878 /* size of a short form block */ 1879 #define XFS_BTREE_SBLOCK_LEN \ 1880 (offsetof(struct xfs_btree_block, bb_u) + \ 1881 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1882 /* size of a long form block */ 1883 #define XFS_BTREE_LBLOCK_LEN \ 1884 (offsetof(struct xfs_btree_block, bb_u) + \ 1885 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1886 1887 /* sizes of CRC enabled btree blocks */ 1888 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1889 (offsetof(struct xfs_btree_block, bb_u) + \ 1890 sizeof(struct xfs_btree_block_shdr)) 1891 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1892 (offsetof(struct xfs_btree_block, bb_u) + \ 1893 sizeof(struct xfs_btree_block_lhdr)) 1894 1895 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1896 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1897 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1898 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1899 1900 /* 1901 * On-disk XFS access control list structure. 1902 */ 1903 struct xfs_acl_entry { 1904 __be32 ae_tag; 1905 __be32 ae_id; 1906 __be16 ae_perm; 1907 __be16 ae_pad; /* fill the implicit hole in the structure */ 1908 }; 1909 1910 struct xfs_acl { 1911 __be32 acl_cnt; 1912 struct xfs_acl_entry acl_entry[]; 1913 }; 1914 1915 /* 1916 * The number of ACL entries allowed is defined by the on-disk format. 1917 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1918 * limited only by the maximum size of the xattr that stores the information. 1919 */ 1920 #define XFS_ACL_MAX_ENTRIES(mp) \ 1921 (xfs_sb_version_hascrc(&mp->m_sb) \ 1922 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1923 sizeof(struct xfs_acl_entry) \ 1924 : 25) 1925 1926 #define XFS_ACL_SIZE(cnt) \ 1927 (sizeof(struct xfs_acl) + \ 1928 sizeof(struct xfs_acl_entry) * cnt) 1929 1930 #define XFS_ACL_MAX_SIZE(mp) \ 1931 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1932 1933 1934 /* On-disk XFS extended attribute names */ 1935 #define SGI_ACL_FILE "SGI_ACL_FILE" 1936 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1937 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1938 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1939 1940 #endif /* __XFS_FORMAT_H__ */ 1941