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_ALL \ 453 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 454 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 455 XFS_SB_FEAT_RO_COMPAT_REFLINK) 456 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 457 static inline bool 458 xfs_sb_has_ro_compat_feature( 459 struct xfs_sb *sbp, 460 uint32_t feature) 461 { 462 return (sbp->sb_features_ro_compat & feature) != 0; 463 } 464 465 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 466 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 467 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 468 #define XFS_SB_FEAT_INCOMPAT_ALL \ 469 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 470 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 471 XFS_SB_FEAT_INCOMPAT_META_UUID) 472 473 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 474 static inline bool 475 xfs_sb_has_incompat_feature( 476 struct xfs_sb *sbp, 477 uint32_t feature) 478 { 479 return (sbp->sb_features_incompat & feature) != 0; 480 } 481 482 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 483 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 484 static inline bool 485 xfs_sb_has_incompat_log_feature( 486 struct xfs_sb *sbp, 487 uint32_t feature) 488 { 489 return (sbp->sb_features_log_incompat & feature) != 0; 490 } 491 492 /* 493 * V5 superblock specific feature checks 494 */ 495 static inline bool xfs_sb_version_hascrc(struct xfs_sb *sbp) 496 { 497 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 498 } 499 500 static inline bool xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 501 { 502 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 503 } 504 505 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 506 { 507 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 508 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 509 (xfs_sb_version_hasmorebits(sbp) && 510 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 511 } 512 513 static inline bool xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 514 { 515 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 516 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 517 } 518 519 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 520 { 521 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 522 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 523 } 524 525 /* 526 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 527 * is stored separately from the user-visible UUID; this allows the 528 * user-visible UUID to be changed on V5 filesystems which have a 529 * filesystem UUID stamped into every piece of metadata. 530 */ 531 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 532 { 533 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 534 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 535 } 536 537 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp) 538 { 539 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 540 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT); 541 } 542 543 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) 544 { 545 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 546 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); 547 } 548 549 /* 550 * end of superblock version macros 551 */ 552 553 static inline bool 554 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 555 { 556 return (ino == sbp->sb_uquotino || 557 ino == sbp->sb_gquotino || 558 ino == sbp->sb_pquotino); 559 } 560 561 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 562 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 563 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 564 565 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 566 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 567 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 568 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 569 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 570 571 /* 572 * File system sector to basic block conversions. 573 */ 574 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 575 576 /* 577 * File system block to basic block conversions. 578 */ 579 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 580 #define XFS_BB_TO_FSB(mp,bb) \ 581 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 582 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 583 584 /* 585 * File system block to byte conversions. 586 */ 587 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 588 #define XFS_B_TO_FSB(mp,b) \ 589 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 590 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 591 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 592 593 /* 594 * Allocation group header 595 * 596 * This is divided into three structures, placed in sequential 512-byte 597 * buffers after a copy of the superblock (also in a 512-byte buffer). 598 */ 599 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 600 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 601 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 602 #define XFS_AGF_VERSION 1 603 #define XFS_AGI_VERSION 1 604 605 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 606 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 607 608 /* 609 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the 610 * arrays below. 611 */ 612 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1) 613 614 /* 615 * The second word of agf_levels in the first a.g. overlaps the EFS 616 * superblock's magic number. Since the magic numbers valid for EFS 617 * are > 64k, our value cannot be confused for an EFS superblock's. 618 */ 619 620 typedef struct xfs_agf { 621 /* 622 * Common allocation group header information 623 */ 624 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 625 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 626 __be32 agf_seqno; /* sequence # starting from 0 */ 627 __be32 agf_length; /* size in blocks of a.g. */ 628 /* 629 * Freespace and rmap information 630 */ 631 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 632 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 633 634 __be32 agf_flfirst; /* first freelist block's index */ 635 __be32 agf_fllast; /* last freelist block's index */ 636 __be32 agf_flcount; /* count of blocks in freelist */ 637 __be32 agf_freeblks; /* total free blocks */ 638 639 __be32 agf_longest; /* longest free space */ 640 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 641 uuid_t agf_uuid; /* uuid of filesystem */ 642 643 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 644 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 645 646 __be32 agf_refcount_root; /* refcount tree root block */ 647 __be32 agf_refcount_level; /* refcount btree levels */ 648 649 /* 650 * reserve some contiguous space for future logged fields before we add 651 * the unlogged fields. This makes the range logging via flags and 652 * structure offsets much simpler. 653 */ 654 __be64 agf_spare64[14]; 655 656 /* unlogged fields, written during buffer writeback. */ 657 __be64 agf_lsn; /* last write sequence */ 658 __be32 agf_crc; /* crc of agf sector */ 659 __be32 agf_spare2; 660 661 /* structure must be padded to 64 bit alignment */ 662 } xfs_agf_t; 663 664 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 665 666 #define XFS_AGF_MAGICNUM 0x00000001 667 #define XFS_AGF_VERSIONNUM 0x00000002 668 #define XFS_AGF_SEQNO 0x00000004 669 #define XFS_AGF_LENGTH 0x00000008 670 #define XFS_AGF_ROOTS 0x00000010 671 #define XFS_AGF_LEVELS 0x00000020 672 #define XFS_AGF_FLFIRST 0x00000040 673 #define XFS_AGF_FLLAST 0x00000080 674 #define XFS_AGF_FLCOUNT 0x00000100 675 #define XFS_AGF_FREEBLKS 0x00000200 676 #define XFS_AGF_LONGEST 0x00000400 677 #define XFS_AGF_BTREEBLKS 0x00000800 678 #define XFS_AGF_UUID 0x00001000 679 #define XFS_AGF_RMAP_BLOCKS 0x00002000 680 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 681 #define XFS_AGF_REFCOUNT_ROOT 0x00008000 682 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000 683 #define XFS_AGF_SPARE64 0x00020000 684 #define XFS_AGF_NUM_BITS 18 685 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 686 687 #define XFS_AGF_FLAGS \ 688 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 689 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 690 { XFS_AGF_SEQNO, "SEQNO" }, \ 691 { XFS_AGF_LENGTH, "LENGTH" }, \ 692 { XFS_AGF_ROOTS, "ROOTS" }, \ 693 { XFS_AGF_LEVELS, "LEVELS" }, \ 694 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 695 { XFS_AGF_FLLAST, "FLLAST" }, \ 696 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 697 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 698 { XFS_AGF_LONGEST, "LONGEST" }, \ 699 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 700 { XFS_AGF_UUID, "UUID" }, \ 701 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 702 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 703 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 704 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 705 { XFS_AGF_SPARE64, "SPARE64" } 706 707 /* disk block (xfs_daddr_t) in the AG */ 708 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 709 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 710 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 711 712 /* 713 * Size of the unlinked inode hash table in the agi. 714 */ 715 #define XFS_AGI_UNLINKED_BUCKETS 64 716 717 typedef struct xfs_agi { 718 /* 719 * Common allocation group header information 720 */ 721 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 722 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 723 __be32 agi_seqno; /* sequence # starting from 0 */ 724 __be32 agi_length; /* size in blocks of a.g. */ 725 /* 726 * Inode information 727 * Inodes are mapped by interpreting the inode number, so no 728 * mapping data is needed here. 729 */ 730 __be32 agi_count; /* count of allocated inodes */ 731 __be32 agi_root; /* root of inode btree */ 732 __be32 agi_level; /* levels in inode btree */ 733 __be32 agi_freecount; /* number of free inodes */ 734 735 __be32 agi_newino; /* new inode just allocated */ 736 __be32 agi_dirino; /* last directory inode chunk */ 737 /* 738 * Hash table of inodes which have been unlinked but are 739 * still being referenced. 740 */ 741 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 742 /* 743 * This marks the end of logging region 1 and start of logging region 2. 744 */ 745 uuid_t agi_uuid; /* uuid of filesystem */ 746 __be32 agi_crc; /* crc of agi sector */ 747 __be32 agi_pad32; 748 __be64 agi_lsn; /* last write sequence */ 749 750 __be32 agi_free_root; /* root of the free inode btree */ 751 __be32 agi_free_level;/* levels in free inode btree */ 752 753 /* structure must be padded to 64 bit alignment */ 754 } xfs_agi_t; 755 756 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 757 758 #define XFS_AGI_MAGICNUM (1 << 0) 759 #define XFS_AGI_VERSIONNUM (1 << 1) 760 #define XFS_AGI_SEQNO (1 << 2) 761 #define XFS_AGI_LENGTH (1 << 3) 762 #define XFS_AGI_COUNT (1 << 4) 763 #define XFS_AGI_ROOT (1 << 5) 764 #define XFS_AGI_LEVEL (1 << 6) 765 #define XFS_AGI_FREECOUNT (1 << 7) 766 #define XFS_AGI_NEWINO (1 << 8) 767 #define XFS_AGI_DIRINO (1 << 9) 768 #define XFS_AGI_UNLINKED (1 << 10) 769 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 770 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 771 #define XFS_AGI_FREE_ROOT (1 << 11) 772 #define XFS_AGI_FREE_LEVEL (1 << 12) 773 #define XFS_AGI_NUM_BITS_R2 13 774 775 /* disk block (xfs_daddr_t) in the AG */ 776 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 777 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 778 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 779 780 /* 781 * The third a.g. block contains the a.g. freelist, an array 782 * of block pointers to blocks owned by the allocation btree code. 783 */ 784 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 785 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 786 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 787 788 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 789 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 790 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 791 (__be32 *)(bp)->b_addr) 792 793 typedef struct xfs_agfl { 794 __be32 agfl_magicnum; 795 __be32 agfl_seqno; 796 uuid_t agfl_uuid; 797 __be64 agfl_lsn; 798 __be32 agfl_crc; 799 __be32 agfl_bno[]; /* actually xfs_agfl_size(mp) */ 800 } __attribute__((packed)) xfs_agfl_t; 801 802 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 803 804 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 805 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 806 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 807 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 808 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 809 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 810 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 811 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 812 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 813 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 814 815 /* 816 * For checking for bad ranges of xfs_daddr_t's, covering multiple 817 * allocation groups or a single xfs_daddr_t that's a superblock copy. 818 */ 819 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 820 ((len) == 1 ? \ 821 ASSERT((d) == XFS_SB_DADDR || \ 822 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 823 ASSERT(xfs_daddr_to_agno(mp, d) == \ 824 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 825 826 typedef struct xfs_timestamp { 827 __be32 t_sec; /* timestamp seconds */ 828 __be32 t_nsec; /* timestamp nanoseconds */ 829 } xfs_timestamp_t; 830 831 /* 832 * On-disk inode structure. 833 * 834 * This is just the header or "dinode core", the inode is expanded to fill a 835 * variable size the leftover area split into a data and an attribute fork. 836 * The format of the data and attribute fork depends on the format of the 837 * inode as indicated by di_format and di_aformat. To access the data and 838 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 839 * below. 840 * 841 * There is a very similar struct icdinode in xfs_inode which matches the 842 * layout of the first 96 bytes of this structure, but is kept in native 843 * format instead of big endian. 844 * 845 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 846 * padding field for v3 inodes. 847 */ 848 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 849 typedef struct xfs_dinode { 850 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 851 __be16 di_mode; /* mode and type of file */ 852 __u8 di_version; /* inode version */ 853 __u8 di_format; /* format of di_c data */ 854 __be16 di_onlink; /* old number of links to file */ 855 __be32 di_uid; /* owner's user id */ 856 __be32 di_gid; /* owner's group id */ 857 __be32 di_nlink; /* number of links to file */ 858 __be16 di_projid_lo; /* lower part of owner's project id */ 859 __be16 di_projid_hi; /* higher part owner's project id */ 860 __u8 di_pad[6]; /* unused, zeroed space */ 861 __be16 di_flushiter; /* incremented on flush */ 862 xfs_timestamp_t di_atime; /* time last accessed */ 863 xfs_timestamp_t di_mtime; /* time last modified */ 864 xfs_timestamp_t di_ctime; /* time created/inode modified */ 865 __be64 di_size; /* number of bytes in file */ 866 __be64 di_nblocks; /* # of direct & btree blocks used */ 867 __be32 di_extsize; /* basic/minimum extent size for file */ 868 __be32 di_nextents; /* number of extents in data fork */ 869 __be16 di_anextents; /* number of extents in attribute fork*/ 870 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 871 __s8 di_aformat; /* format of attr fork's data */ 872 __be32 di_dmevmask; /* DMIG event mask */ 873 __be16 di_dmstate; /* DMIG state info */ 874 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 875 __be32 di_gen; /* generation number */ 876 877 /* di_next_unlinked is the only non-core field in the old dinode */ 878 __be32 di_next_unlinked;/* agi unlinked list ptr */ 879 880 /* start of the extended dinode, writable fields */ 881 __le32 di_crc; /* CRC of the inode */ 882 __be64 di_changecount; /* number of attribute changes */ 883 __be64 di_lsn; /* flush sequence */ 884 __be64 di_flags2; /* more random flags */ 885 __be32 di_cowextsize; /* basic cow extent size for file */ 886 __u8 di_pad2[12]; /* more padding for future expansion */ 887 888 /* fields only written to during inode creation */ 889 xfs_timestamp_t di_crtime; /* time created */ 890 __be64 di_ino; /* inode number */ 891 uuid_t di_uuid; /* UUID of the filesystem */ 892 893 /* structure must be padded to 64 bit alignment */ 894 } xfs_dinode_t; 895 896 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 897 898 #define DI_MAX_FLUSH 0xffff 899 900 /* 901 * Size of the core inode on disk. Version 1 and 2 inodes have 902 * the same size, but version 3 has grown a few additional fields. 903 */ 904 static inline uint xfs_dinode_size(int version) 905 { 906 if (version == 3) 907 return sizeof(struct xfs_dinode); 908 return offsetof(struct xfs_dinode, di_crc); 909 } 910 911 /* 912 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 913 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 914 */ 915 #define XFS_MAXLINK ((1U << 31) - 1U) 916 917 /* 918 * Values for di_format 919 * 920 * This enum is used in string mapping in xfs_trace.h; please keep the 921 * TRACE_DEFINE_ENUMs for it up to date. 922 */ 923 typedef enum xfs_dinode_fmt { 924 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 925 XFS_DINODE_FMT_LOCAL, /* bulk data */ 926 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 927 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 928 XFS_DINODE_FMT_UUID /* added long ago, but never used */ 929 } xfs_dinode_fmt_t; 930 931 #define XFS_INODE_FORMAT_STR \ 932 { XFS_DINODE_FMT_DEV, "dev" }, \ 933 { XFS_DINODE_FMT_LOCAL, "local" }, \ 934 { XFS_DINODE_FMT_EXTENTS, "extent" }, \ 935 { XFS_DINODE_FMT_BTREE, "btree" }, \ 936 { XFS_DINODE_FMT_UUID, "uuid" } 937 938 /* 939 * Inode minimum and maximum sizes. 940 */ 941 #define XFS_DINODE_MIN_LOG 8 942 #define XFS_DINODE_MAX_LOG 11 943 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 944 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 945 946 /* 947 * Inode size for given fs. 948 */ 949 #define XFS_LITINO(mp, version) \ 950 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 951 952 /* 953 * Inode data & attribute fork sizes, per inode. 954 */ 955 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 956 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 957 958 #define XFS_DFORK_DSIZE(dip,mp) \ 959 (XFS_DFORK_Q(dip) ? \ 960 XFS_DFORK_BOFF(dip) : \ 961 XFS_LITINO(mp, (dip)->di_version)) 962 #define XFS_DFORK_ASIZE(dip,mp) \ 963 (XFS_DFORK_Q(dip) ? \ 964 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 965 0) 966 #define XFS_DFORK_SIZE(dip,mp,w) \ 967 ((w) == XFS_DATA_FORK ? \ 968 XFS_DFORK_DSIZE(dip, mp) : \ 969 XFS_DFORK_ASIZE(dip, mp)) 970 971 #define XFS_DFORK_MAXEXT(dip, mp, w) \ 972 (XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec)) 973 974 /* 975 * Return pointers to the data or attribute forks. 976 */ 977 #define XFS_DFORK_DPTR(dip) \ 978 ((char *)dip + xfs_dinode_size(dip->di_version)) 979 #define XFS_DFORK_APTR(dip) \ 980 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 981 #define XFS_DFORK_PTR(dip,w) \ 982 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 983 984 #define XFS_DFORK_FORMAT(dip,w) \ 985 ((w) == XFS_DATA_FORK ? \ 986 (dip)->di_format : \ 987 (dip)->di_aformat) 988 #define XFS_DFORK_NEXTENTS(dip,w) \ 989 ((w) == XFS_DATA_FORK ? \ 990 be32_to_cpu((dip)->di_nextents) : \ 991 be16_to_cpu((dip)->di_anextents)) 992 993 /* 994 * For block and character special files the 32bit dev_t is stored at the 995 * beginning of the data fork. 996 */ 997 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 998 { 999 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1000 } 1001 1002 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1003 { 1004 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1005 } 1006 1007 /* 1008 * Values for di_flags 1009 */ 1010 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1011 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1012 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1013 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1014 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1015 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1016 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1017 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1018 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1019 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1020 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1021 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1022 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1023 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1024 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1025 /* Do not use bit 15, di_flags is legacy and unchanging now */ 1026 1027 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1028 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1029 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1030 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1031 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1032 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1033 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1034 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1035 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1036 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1037 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1038 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1039 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1040 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1041 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1042 1043 #define XFS_DIFLAG_ANY \ 1044 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1045 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1046 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1047 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1048 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1049 1050 /* 1051 * Values for di_flags2 These start by being exposed to userspace in the upper 1052 * 16 bits of the XFS_XFLAG_s range. 1053 */ 1054 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1055 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ 1056 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ 1057 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1058 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) 1059 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) 1060 1061 #define XFS_DIFLAG2_ANY \ 1062 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) 1063 1064 /* 1065 * Inode number format: 1066 * low inopblog bits - offset in block 1067 * next agblklog bits - block number in ag 1068 * next agno_log bits - ag number 1069 * high agno_log-agblklog-inopblog bits - 0 1070 */ 1071 #define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1) 1072 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1073 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1074 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1075 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1076 #define XFS_INO_BITS(mp) \ 1077 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1078 #define XFS_INO_TO_AGNO(mp,i) \ 1079 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1080 #define XFS_INO_TO_AGINO(mp,i) \ 1081 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1082 #define XFS_INO_TO_AGBNO(mp,i) \ 1083 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1084 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1085 #define XFS_INO_TO_OFFSET(mp,i) \ 1086 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1087 #define XFS_INO_TO_FSB(mp,i) \ 1088 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1089 #define XFS_AGINO_TO_INO(mp,a,i) \ 1090 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1091 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1092 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1093 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1094 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1095 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1096 #define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1097 #define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp))) 1098 1099 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1100 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1101 1102 /* 1103 * RealTime Device format definitions 1104 */ 1105 1106 /* Min and max rt extent sizes, specified in bytes */ 1107 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1108 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1109 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1110 1111 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1112 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1113 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1114 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1115 1116 /* 1117 * RT Summary and bit manipulation macros. 1118 */ 1119 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1120 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1121 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1122 #define XFS_SUMPTR(mp,bp,so) \ 1123 ((xfs_suminfo_t *)((bp)->b_addr + \ 1124 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1125 1126 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1127 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1128 #define XFS_BITTOWORD(mp,bi) \ 1129 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1130 1131 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1132 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1133 1134 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1135 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1136 1137 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1138 1139 /* 1140 * Dquot and dquot block format definitions 1141 */ 1142 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1143 #define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */ 1144 1145 /* 1146 * This is the main portion of the on-disk representation of quota 1147 * information for a user. This is the q_core of the xfs_dquot_t that 1148 * is kept in kernel memory. We pad this with some more expansion room 1149 * to construct the on disk structure. 1150 */ 1151 typedef struct xfs_disk_dquot { 1152 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1153 __u8 d_version; /* dquot version */ 1154 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1155 __be32 d_id; /* user,project,group id */ 1156 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1157 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1158 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1159 __be64 d_ino_softlimit;/* preferred inode limit */ 1160 __be64 d_bcount; /* disk blocks owned by the user */ 1161 __be64 d_icount; /* inodes owned by the user */ 1162 __be32 d_itimer; /* zero if within inode limits if not, 1163 this is when we refuse service */ 1164 __be32 d_btimer; /* similar to above; for disk blocks */ 1165 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1166 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1167 __be32 d_pad0; /* 64 bit align */ 1168 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1169 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1170 __be64 d_rtbcount; /* realtime blocks owned */ 1171 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1172 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1173 __be16 d_pad; 1174 } xfs_disk_dquot_t; 1175 1176 /* 1177 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1178 * carrying the unnecessary padding would be a waste of memory. 1179 */ 1180 typedef struct xfs_dqblk { 1181 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1182 char dd_fill[4]; /* filling for posterity */ 1183 1184 /* 1185 * These two are only present on filesystems with the CRC bits set. 1186 */ 1187 __be32 dd_crc; /* checksum */ 1188 __be64 dd_lsn; /* last modification in log */ 1189 uuid_t dd_uuid; /* location information */ 1190 } xfs_dqblk_t; 1191 1192 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1193 1194 /* 1195 * Remote symlink format and access functions. 1196 */ 1197 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1198 1199 struct xfs_dsymlink_hdr { 1200 __be32 sl_magic; 1201 __be32 sl_offset; 1202 __be32 sl_bytes; 1203 __be32 sl_crc; 1204 uuid_t sl_uuid; 1205 __be64 sl_owner; 1206 __be64 sl_blkno; 1207 __be64 sl_lsn; 1208 }; 1209 1210 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1211 1212 #define XFS_SYMLINK_MAXLEN 1024 1213 /* 1214 * The maximum pathlen is 1024 bytes. Since the minimum file system 1215 * blocksize is 512 bytes, we can get a max of 3 extents back from 1216 * bmapi when crc headers are taken into account. 1217 */ 1218 #define XFS_SYMLINK_MAPS 3 1219 1220 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1221 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1222 sizeof(struct xfs_dsymlink_hdr) : 0)) 1223 1224 1225 /* 1226 * Allocation Btree format definitions 1227 * 1228 * There are two on-disk btrees, one sorted by blockno and one sorted 1229 * by blockcount and blockno. All blocks look the same to make the code 1230 * simpler; if we have time later, we'll make the optimizations. 1231 */ 1232 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1233 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1234 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1235 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1236 1237 /* 1238 * Data record/key structure 1239 */ 1240 typedef struct xfs_alloc_rec { 1241 __be32 ar_startblock; /* starting block number */ 1242 __be32 ar_blockcount; /* count of free blocks */ 1243 } xfs_alloc_rec_t, xfs_alloc_key_t; 1244 1245 typedef struct xfs_alloc_rec_incore { 1246 xfs_agblock_t ar_startblock; /* starting block number */ 1247 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1248 } xfs_alloc_rec_incore_t; 1249 1250 /* btree pointer type */ 1251 typedef __be32 xfs_alloc_ptr_t; 1252 1253 /* 1254 * Block numbers in the AG: 1255 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1256 */ 1257 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1258 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1259 1260 1261 /* 1262 * Inode Allocation Btree format definitions 1263 * 1264 * There is a btree for the inode map per allocation group. 1265 */ 1266 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1267 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1268 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1269 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1270 1271 typedef uint64_t xfs_inofree_t; 1272 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1273 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1274 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1275 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1276 1277 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1278 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t)) 1279 #define XFS_INODES_PER_HOLEMASK_BIT \ 1280 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t))) 1281 1282 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1283 { 1284 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1285 } 1286 1287 /* 1288 * The on-disk inode record structure has two formats. The original "full" 1289 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1290 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1291 * count. 1292 * 1293 * The holemask of the sparse record format allows an inode chunk to have holes 1294 * that refer to blocks not owned by the inode record. This facilitates inode 1295 * allocation in the event of severe free space fragmentation. 1296 */ 1297 typedef struct xfs_inobt_rec { 1298 __be32 ir_startino; /* starting inode number */ 1299 union { 1300 struct { 1301 __be32 ir_freecount; /* count of free inodes */ 1302 } f; 1303 struct { 1304 __be16 ir_holemask;/* hole mask for sparse chunks */ 1305 __u8 ir_count; /* total inode count */ 1306 __u8 ir_freecount; /* count of free inodes */ 1307 } sp; 1308 } ir_u; 1309 __be64 ir_free; /* free inode mask */ 1310 } xfs_inobt_rec_t; 1311 1312 typedef struct xfs_inobt_rec_incore { 1313 xfs_agino_t ir_startino; /* starting inode number */ 1314 uint16_t ir_holemask; /* hole mask for sparse chunks */ 1315 uint8_t ir_count; /* total inode count */ 1316 uint8_t ir_freecount; /* count of free inodes (set bits) */ 1317 xfs_inofree_t ir_free; /* free inode mask */ 1318 } xfs_inobt_rec_incore_t; 1319 1320 static inline bool xfs_inobt_issparse(uint16_t holemask) 1321 { 1322 /* non-zero holemask represents a sparse rec. */ 1323 return holemask; 1324 } 1325 1326 /* 1327 * Key structure 1328 */ 1329 typedef struct xfs_inobt_key { 1330 __be32 ir_startino; /* starting inode number */ 1331 } xfs_inobt_key_t; 1332 1333 /* btree pointer type */ 1334 typedef __be32 xfs_inobt_ptr_t; 1335 1336 /* 1337 * block numbers in the AG. 1338 */ 1339 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1340 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1341 1342 /* 1343 * Reverse mapping btree format definitions 1344 * 1345 * There is a btree for the reverse map per allocation group 1346 */ 1347 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1348 1349 /* 1350 * Ownership info for an extent. This is used to create reverse-mapping 1351 * entries. 1352 */ 1353 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1354 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1355 struct xfs_owner_info { 1356 uint64_t oi_owner; 1357 xfs_fileoff_t oi_offset; 1358 unsigned int oi_flags; 1359 }; 1360 1361 /* 1362 * Special owner types. 1363 * 1364 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1365 * to tell us we have a special owner value. We use these for static metadata 1366 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1367 */ 1368 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1369 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1370 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1371 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1372 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1373 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1374 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1375 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1376 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1377 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1378 1379 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1380 1381 /* 1382 * Data record structure 1383 */ 1384 struct xfs_rmap_rec { 1385 __be32 rm_startblock; /* extent start block */ 1386 __be32 rm_blockcount; /* extent length */ 1387 __be64 rm_owner; /* extent owner */ 1388 __be64 rm_offset; /* offset within the owner */ 1389 }; 1390 1391 /* 1392 * rmap btree record 1393 * rm_offset:63 is the attribute fork flag 1394 * rm_offset:62 is the bmbt block flag 1395 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1396 * rm_offset:54-60 aren't used and should be zero 1397 * rm_offset:0-53 is the block offset within the inode 1398 */ 1399 #define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63) 1400 #define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62) 1401 #define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61) 1402 1403 #define XFS_RMAP_LEN_MAX ((uint32_t)~0U) 1404 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1405 XFS_RMAP_OFF_BMBT_BLOCK | \ 1406 XFS_RMAP_OFF_UNWRITTEN) 1407 #define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL) 1408 1409 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1410 1411 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1412 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1413 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1414 1415 #define RMAPBT_STARTBLOCK_BITLEN 32 1416 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1417 #define RMAPBT_OWNER_BITLEN 64 1418 #define RMAPBT_ATTRFLAG_BITLEN 1 1419 #define RMAPBT_BMBTFLAG_BITLEN 1 1420 #define RMAPBT_EXNTFLAG_BITLEN 1 1421 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1422 #define RMAPBT_OFFSET_BITLEN 54 1423 1424 #define XFS_RMAP_ATTR_FORK (1 << 0) 1425 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1426 #define XFS_RMAP_UNWRITTEN (1 << 2) 1427 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1428 XFS_RMAP_BMBT_BLOCK) 1429 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1430 struct xfs_rmap_irec { 1431 xfs_agblock_t rm_startblock; /* extent start block */ 1432 xfs_extlen_t rm_blockcount; /* extent length */ 1433 uint64_t rm_owner; /* extent owner */ 1434 uint64_t rm_offset; /* offset within the owner */ 1435 unsigned int rm_flags; /* state flags */ 1436 }; 1437 1438 /* 1439 * Key structure 1440 * 1441 * We don't use the length for lookups 1442 */ 1443 struct xfs_rmap_key { 1444 __be32 rm_startblock; /* extent start block */ 1445 __be64 rm_owner; /* extent owner */ 1446 __be64 rm_offset; /* offset within the owner */ 1447 } __attribute__((packed)); 1448 1449 /* btree pointer type */ 1450 typedef __be32 xfs_rmap_ptr_t; 1451 1452 #define XFS_RMAP_BLOCK(mp) \ 1453 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1454 XFS_FIBT_BLOCK(mp) + 1 : \ 1455 XFS_IBT_BLOCK(mp) + 1) 1456 1457 /* 1458 * Reference Count Btree format definitions 1459 * 1460 */ 1461 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1462 1463 unsigned int xfs_refc_block(struct xfs_mount *mp); 1464 1465 /* 1466 * Data record/key structure 1467 * 1468 * Each record associates a range of physical blocks (starting at 1469 * rc_startblock and ending rc_blockcount blocks later) with a reference 1470 * count (rc_refcount). Extents that are being used to stage a copy on 1471 * write (CoW) operation are recorded in the refcount btree with a 1472 * refcount of 1. All other records must have a refcount > 1 and must 1473 * track an extent mapped only by file data forks. 1474 * 1475 * Extents with a single owner (attributes, metadata, non-shared file 1476 * data) are not tracked here. Free space is also not tracked here. 1477 * This is consistent with pre-reflink XFS. 1478 */ 1479 1480 /* 1481 * Extents that are being used to stage a copy on write are stored 1482 * in the refcount btree with a refcount of 1 and the upper bit set 1483 * on the startblock. This speeds up mount time deletion of stale 1484 * staging extents because they're all at the right side of the tree. 1485 */ 1486 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) 1487 #define REFCNTBT_COWFLAG_BITLEN 1 1488 #define REFCNTBT_AGBLOCK_BITLEN 31 1489 1490 struct xfs_refcount_rec { 1491 __be32 rc_startblock; /* starting block number */ 1492 __be32 rc_blockcount; /* count of blocks */ 1493 __be32 rc_refcount; /* number of inodes linked here */ 1494 }; 1495 1496 struct xfs_refcount_key { 1497 __be32 rc_startblock; /* starting block number */ 1498 }; 1499 1500 struct xfs_refcount_irec { 1501 xfs_agblock_t rc_startblock; /* starting block number */ 1502 xfs_extlen_t rc_blockcount; /* count of free blocks */ 1503 xfs_nlink_t rc_refcount; /* number of inodes linked here */ 1504 }; 1505 1506 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1507 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1508 1509 /* btree pointer type */ 1510 typedef __be32 xfs_refcount_ptr_t; 1511 1512 1513 /* 1514 * BMAP Btree format definitions 1515 * 1516 * This includes both the root block definition that sits inside an inode fork 1517 * and the record/pointer formats for the leaf/node in the blocks. 1518 */ 1519 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1520 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1521 1522 /* 1523 * Bmap root header, on-disk form only. 1524 */ 1525 typedef struct xfs_bmdr_block { 1526 __be16 bb_level; /* 0 is a leaf */ 1527 __be16 bb_numrecs; /* current # of data records */ 1528 } xfs_bmdr_block_t; 1529 1530 /* 1531 * Bmap btree record and extent descriptor. 1532 * l0:63 is an extent flag (value 1 indicates non-normal). 1533 * l0:9-62 are startoff. 1534 * l0:0-8 and l1:21-63 are startblock. 1535 * l1:0-20 are blockcount. 1536 */ 1537 #define BMBT_EXNTFLAG_BITLEN 1 1538 #define BMBT_STARTOFF_BITLEN 54 1539 #define BMBT_STARTBLOCK_BITLEN 52 1540 #define BMBT_BLOCKCOUNT_BITLEN 21 1541 1542 #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1) 1543 1544 typedef struct xfs_bmbt_rec { 1545 __be64 l0, l1; 1546 } xfs_bmbt_rec_t; 1547 1548 typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1549 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1550 1551 /* 1552 * Values and macros for delayed-allocation startblock fields. 1553 */ 1554 #define STARTBLOCKVALBITS 17 1555 #define STARTBLOCKMASKBITS (15 + 20) 1556 #define STARTBLOCKMASK \ 1557 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1558 1559 static inline int isnullstartblock(xfs_fsblock_t x) 1560 { 1561 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1562 } 1563 1564 static inline xfs_fsblock_t nullstartblock(int k) 1565 { 1566 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1567 return STARTBLOCKMASK | (k); 1568 } 1569 1570 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1571 { 1572 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1573 } 1574 1575 /* 1576 * Key structure for non-leaf levels of the tree. 1577 */ 1578 typedef struct xfs_bmbt_key { 1579 __be64 br_startoff; /* starting file offset */ 1580 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1581 1582 /* btree pointer type */ 1583 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1584 1585 1586 /* 1587 * Generic Btree block format definitions 1588 * 1589 * This is a combination of the actual format used on disk for short and long 1590 * format btrees. The first three fields are shared by both format, but the 1591 * pointers are different and should be used with care. 1592 * 1593 * To get the size of the actual short or long form headers please use the size 1594 * macros below. Never use sizeof(xfs_btree_block). 1595 * 1596 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1597 * with the crc feature bit, and all accesses to them must be conditional on 1598 * that flag. 1599 */ 1600 /* short form block header */ 1601 struct xfs_btree_block_shdr { 1602 __be32 bb_leftsib; 1603 __be32 bb_rightsib; 1604 1605 __be64 bb_blkno; 1606 __be64 bb_lsn; 1607 uuid_t bb_uuid; 1608 __be32 bb_owner; 1609 __le32 bb_crc; 1610 }; 1611 1612 /* long form block header */ 1613 struct xfs_btree_block_lhdr { 1614 __be64 bb_leftsib; 1615 __be64 bb_rightsib; 1616 1617 __be64 bb_blkno; 1618 __be64 bb_lsn; 1619 uuid_t bb_uuid; 1620 __be64 bb_owner; 1621 __le32 bb_crc; 1622 __be32 bb_pad; /* padding for alignment */ 1623 }; 1624 1625 struct xfs_btree_block { 1626 __be32 bb_magic; /* magic number for block type */ 1627 __be16 bb_level; /* 0 is a leaf */ 1628 __be16 bb_numrecs; /* current # of data records */ 1629 union { 1630 struct xfs_btree_block_shdr s; 1631 struct xfs_btree_block_lhdr l; 1632 } bb_u; /* rest */ 1633 }; 1634 1635 /* size of a short form block */ 1636 #define XFS_BTREE_SBLOCK_LEN \ 1637 (offsetof(struct xfs_btree_block, bb_u) + \ 1638 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1639 /* size of a long form block */ 1640 #define XFS_BTREE_LBLOCK_LEN \ 1641 (offsetof(struct xfs_btree_block, bb_u) + \ 1642 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1643 1644 /* sizes of CRC enabled btree blocks */ 1645 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1646 (offsetof(struct xfs_btree_block, bb_u) + \ 1647 sizeof(struct xfs_btree_block_shdr)) 1648 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1649 (offsetof(struct xfs_btree_block, bb_u) + \ 1650 sizeof(struct xfs_btree_block_lhdr)) 1651 1652 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1653 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1654 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1655 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1656 1657 /* 1658 * On-disk XFS access control list structure. 1659 */ 1660 struct xfs_acl_entry { 1661 __be32 ae_tag; 1662 __be32 ae_id; 1663 __be16 ae_perm; 1664 __be16 ae_pad; /* fill the implicit hole in the structure */ 1665 }; 1666 1667 struct xfs_acl { 1668 __be32 acl_cnt; 1669 struct xfs_acl_entry acl_entry[0]; 1670 }; 1671 1672 /* 1673 * The number of ACL entries allowed is defined by the on-disk format. 1674 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1675 * limited only by the maximum size of the xattr that stores the information. 1676 */ 1677 #define XFS_ACL_MAX_ENTRIES(mp) \ 1678 (xfs_sb_version_hascrc(&mp->m_sb) \ 1679 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1680 sizeof(struct xfs_acl_entry) \ 1681 : 25) 1682 1683 #define XFS_ACL_SIZE(cnt) \ 1684 (sizeof(struct xfs_acl) + \ 1685 sizeof(struct xfs_acl_entry) * cnt) 1686 1687 #define XFS_ACL_MAX_SIZE(mp) \ 1688 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1689 1690 1691 /* On-disk XFS extended attribute names */ 1692 #define SGI_ACL_FILE "SGI_ACL_FILE" 1693 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1694 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1695 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1696 1697 #endif /* __XFS_FORMAT_H__ */ 1698