1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_FORMAT_H__ 19 #define __XFS_FORMAT_H__ 20 21 /* 22 * XFS On Disk Format Definitions 23 * 24 * This header file defines all the on-disk format definitions for 25 * general XFS objects. Directory and attribute related objects are defined in 26 * xfs_da_format.h, which log and log item formats are defined in 27 * xfs_log_format.h. Everything else goes here. 28 */ 29 30 struct xfs_mount; 31 struct xfs_trans; 32 struct xfs_inode; 33 struct xfs_buf; 34 struct xfs_ifork; 35 36 /* 37 * Super block 38 * Fits into a sector-sized buffer at address 0 of each allocation group. 39 * Only the first of these is ever updated except during growfs. 40 */ 41 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */ 42 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */ 43 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */ 44 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */ 45 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */ 46 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */ 47 #define XFS_SB_VERSION_NUMBITS 0x000f 48 #define XFS_SB_VERSION_ALLFBITS 0xfff0 49 #define XFS_SB_VERSION_ATTRBIT 0x0010 50 #define XFS_SB_VERSION_NLINKBIT 0x0020 51 #define XFS_SB_VERSION_QUOTABIT 0x0040 52 #define XFS_SB_VERSION_ALIGNBIT 0x0080 53 #define XFS_SB_VERSION_DALIGNBIT 0x0100 54 #define XFS_SB_VERSION_SHAREDBIT 0x0200 55 #define XFS_SB_VERSION_LOGV2BIT 0x0400 56 #define XFS_SB_VERSION_SECTORBIT 0x0800 57 #define XFS_SB_VERSION_EXTFLGBIT 0x1000 58 #define XFS_SB_VERSION_DIRV2BIT 0x2000 59 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */ 60 #define XFS_SB_VERSION_MOREBITSBIT 0x8000 61 62 /* 63 * The size of a single extended attribute on disk is limited by 64 * the size of index values within the attribute entries themselves. 65 * These are be16 fields, so we can only support attribute data 66 * sizes up to 2^16 bytes in length. 67 */ 68 #define XFS_XATTR_SIZE_MAX (1 << 16) 69 70 /* 71 * Supported feature bit list is just all bits in the versionnum field because 72 * we've used them all up and understand them all. Except, of course, for the 73 * shared superblock bit, which nobody knows what it does and so is unsupported. 74 */ 75 #define XFS_SB_VERSION_OKBITS \ 76 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ 77 ~XFS_SB_VERSION_SHAREDBIT) 78 79 /* 80 * There are two words to hold XFS "feature" bits: the original 81 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 82 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 83 * 84 * These defines represent bits in sb_features2. 85 */ 86 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 87 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 88 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 89 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 90 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 91 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 92 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ 93 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ 94 95 #define XFS_SB_VERSION2_OKBITS \ 96 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 97 XFS_SB_VERSION2_ATTR2BIT | \ 98 XFS_SB_VERSION2_PROJID32BIT | \ 99 XFS_SB_VERSION2_FTYPE) 100 101 /* 102 * Superblock - in core version. Must match the ondisk version below. 103 * Must be padded to 64 bit alignment. 104 */ 105 typedef struct xfs_sb { 106 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 107 __uint32_t sb_blocksize; /* logical block size, bytes */ 108 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 109 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 110 xfs_rtblock_t sb_rextents; /* number of realtime extents */ 111 uuid_t sb_uuid; /* user-visible file system unique id */ 112 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 113 xfs_ino_t sb_rootino; /* root inode number */ 114 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 115 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 116 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 117 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 118 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 119 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 120 xfs_extlen_t sb_logblocks; /* number of log blocks */ 121 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 122 __uint16_t sb_sectsize; /* volume sector size, bytes */ 123 __uint16_t sb_inodesize; /* inode size, bytes */ 124 __uint16_t sb_inopblock; /* inodes per block */ 125 char sb_fname[12]; /* file system name */ 126 __uint8_t sb_blocklog; /* log2 of sb_blocksize */ 127 __uint8_t sb_sectlog; /* log2 of sb_sectsize */ 128 __uint8_t sb_inodelog; /* log2 of sb_inodesize */ 129 __uint8_t sb_inopblog; /* log2 of sb_inopblock */ 130 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 131 __uint8_t sb_rextslog; /* log2 of sb_rextents */ 132 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 133 __uint8_t sb_imax_pct; /* max % of fs for inode space */ 134 /* statistics */ 135 /* 136 * These fields must remain contiguous. If you really 137 * want to change their layout, make sure you fix the 138 * code in xfs_trans_apply_sb_deltas(). 139 */ 140 __uint64_t sb_icount; /* allocated inodes */ 141 __uint64_t sb_ifree; /* free inodes */ 142 __uint64_t sb_fdblocks; /* free data blocks */ 143 __uint64_t sb_frextents; /* free realtime extents */ 144 /* 145 * End contiguous fields. 146 */ 147 xfs_ino_t sb_uquotino; /* user quota inode */ 148 xfs_ino_t sb_gquotino; /* group quota inode */ 149 __uint16_t sb_qflags; /* quota flags */ 150 __uint8_t sb_flags; /* misc. flags */ 151 __uint8_t sb_shared_vn; /* shared version number */ 152 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 153 __uint32_t sb_unit; /* stripe or raid unit */ 154 __uint32_t sb_width; /* stripe or raid width */ 155 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 156 __uint8_t sb_logsectlog; /* log2 of the log sector size */ 157 __uint16_t sb_logsectsize; /* sector size for the log, bytes */ 158 __uint32_t sb_logsunit; /* stripe unit size for the log */ 159 __uint32_t sb_features2; /* additional feature bits */ 160 161 /* 162 * bad features2 field as a result of failing to pad the sb structure to 163 * 64 bits. Some machines will be using this field for features2 bits. 164 * Easiest just to mark it bad and not use it for anything else. 165 * 166 * This is not kept up to date in memory; it is always overwritten by 167 * the value in sb_features2 when formatting the incore superblock to 168 * the disk buffer. 169 */ 170 __uint32_t sb_bad_features2; 171 172 /* version 5 superblock fields start here */ 173 174 /* feature masks */ 175 __uint32_t sb_features_compat; 176 __uint32_t sb_features_ro_compat; 177 __uint32_t sb_features_incompat; 178 __uint32_t sb_features_log_incompat; 179 180 __uint32_t sb_crc; /* superblock crc */ 181 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ 182 183 xfs_ino_t sb_pquotino; /* project quota inode */ 184 xfs_lsn_t sb_lsn; /* last write sequence */ 185 uuid_t sb_meta_uuid; /* metadata file system unique id */ 186 187 /* must be padded to 64 bit alignment */ 188 } xfs_sb_t; 189 190 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) 191 192 /* 193 * Superblock - on disk version. Must match the in core version above. 194 * Must be padded to 64 bit alignment. 195 */ 196 typedef struct xfs_dsb { 197 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 198 __be32 sb_blocksize; /* logical block size, bytes */ 199 __be64 sb_dblocks; /* number of data blocks */ 200 __be64 sb_rblocks; /* number of realtime blocks */ 201 __be64 sb_rextents; /* number of realtime extents */ 202 uuid_t sb_uuid; /* user-visible file system unique id */ 203 __be64 sb_logstart; /* starting block of log if internal */ 204 __be64 sb_rootino; /* root inode number */ 205 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 206 __be64 sb_rsumino; /* summary inode for rt bitmap */ 207 __be32 sb_rextsize; /* realtime extent size, blocks */ 208 __be32 sb_agblocks; /* size of an allocation group */ 209 __be32 sb_agcount; /* number of allocation groups */ 210 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 211 __be32 sb_logblocks; /* number of log blocks */ 212 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 213 __be16 sb_sectsize; /* volume sector size, bytes */ 214 __be16 sb_inodesize; /* inode size, bytes */ 215 __be16 sb_inopblock; /* inodes per block */ 216 char sb_fname[12]; /* file system name */ 217 __u8 sb_blocklog; /* log2 of sb_blocksize */ 218 __u8 sb_sectlog; /* log2 of sb_sectsize */ 219 __u8 sb_inodelog; /* log2 of sb_inodesize */ 220 __u8 sb_inopblog; /* log2 of sb_inopblock */ 221 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 222 __u8 sb_rextslog; /* log2 of sb_rextents */ 223 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 224 __u8 sb_imax_pct; /* max % of fs for inode space */ 225 /* statistics */ 226 /* 227 * These fields must remain contiguous. If you really 228 * want to change their layout, make sure you fix the 229 * code in xfs_trans_apply_sb_deltas(). 230 */ 231 __be64 sb_icount; /* allocated inodes */ 232 __be64 sb_ifree; /* free inodes */ 233 __be64 sb_fdblocks; /* free data blocks */ 234 __be64 sb_frextents; /* free realtime extents */ 235 /* 236 * End contiguous fields. 237 */ 238 __be64 sb_uquotino; /* user quota inode */ 239 __be64 sb_gquotino; /* group quota inode */ 240 __be16 sb_qflags; /* quota flags */ 241 __u8 sb_flags; /* misc. flags */ 242 __u8 sb_shared_vn; /* shared version number */ 243 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 244 __be32 sb_unit; /* stripe or raid unit */ 245 __be32 sb_width; /* stripe or raid width */ 246 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 247 __u8 sb_logsectlog; /* log2 of the log sector size */ 248 __be16 sb_logsectsize; /* sector size for the log, bytes */ 249 __be32 sb_logsunit; /* stripe unit size for the log */ 250 __be32 sb_features2; /* additional feature bits */ 251 /* 252 * bad features2 field as a result of failing to pad the sb 253 * structure to 64 bits. Some machines will be using this field 254 * for features2 bits. Easiest just to mark it bad and not use 255 * it for anything else. 256 */ 257 __be32 sb_bad_features2; 258 259 /* version 5 superblock fields start here */ 260 261 /* feature masks */ 262 __be32 sb_features_compat; 263 __be32 sb_features_ro_compat; 264 __be32 sb_features_incompat; 265 __be32 sb_features_log_incompat; 266 267 __le32 sb_crc; /* superblock crc */ 268 __be32 sb_spino_align; /* sparse inode chunk alignment */ 269 270 __be64 sb_pquotino; /* project quota inode */ 271 __be64 sb_lsn; /* last write sequence */ 272 uuid_t sb_meta_uuid; /* metadata file system unique id */ 273 274 /* must be padded to 64 bit alignment */ 275 } xfs_dsb_t; 276 277 278 /* 279 * Misc. Flags - warning - these will be cleared by xfs_repair unless 280 * a feature bit is set when the flag is used. 281 */ 282 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 283 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 284 285 /* 286 * define max. shared version we can interoperate with 287 */ 288 #define XFS_SB_MAX_SHARED_VN 0 289 290 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 291 292 /* 293 * The first XFS version we support is a v4 superblock with V2 directories. 294 */ 295 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) 296 { 297 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 298 return false; 299 300 /* check for unknown features in the fs */ 301 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 302 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 303 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 304 return false; 305 306 return true; 307 } 308 309 static inline bool xfs_sb_good_version(struct xfs_sb *sbp) 310 { 311 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) 312 return true; 313 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) 314 return xfs_sb_good_v4_features(sbp); 315 return false; 316 } 317 318 /* 319 * Detect a mismatched features2 field. Older kernels read/wrote 320 * this into the wrong slot, so to be safe we keep them in sync. 321 */ 322 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 323 { 324 return sbp->sb_bad_features2 != sbp->sb_features2; 325 } 326 327 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 328 { 329 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 330 } 331 332 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 333 { 334 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 335 } 336 337 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 338 { 339 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 340 } 341 342 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 343 { 344 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 345 } 346 347 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) 348 { 349 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 350 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); 351 } 352 353 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 354 { 355 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 356 } 357 358 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) 359 { 360 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 361 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); 362 } 363 364 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp) 365 { 366 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 367 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT); 368 } 369 370 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 371 { 372 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 373 } 374 375 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 376 { 377 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 378 } 379 380 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 381 { 382 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 383 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 384 } 385 386 /* 387 * sb_features2 bit version macros. 388 */ 389 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) 390 { 391 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 392 (xfs_sb_version_hasmorebits(sbp) && 393 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); 394 } 395 396 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) 397 { 398 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 399 (xfs_sb_version_hasmorebits(sbp) && 400 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); 401 } 402 403 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 404 { 405 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 406 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 407 } 408 409 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) 410 { 411 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; 412 if (!sbp->sb_features2) 413 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; 414 } 415 416 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) 417 { 418 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 419 (xfs_sb_version_hasmorebits(sbp) && 420 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); 421 } 422 423 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) 424 { 425 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 426 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 427 } 428 429 /* 430 * Extended v5 superblock feature masks. These are to be used for new v5 431 * superblock features only. 432 * 433 * Compat features are new features that old kernels will not notice or affect 434 * and so can mount read-write without issues. 435 * 436 * RO-Compat (read only) are features that old kernels can read but will break 437 * if they write. Hence only read-only mounts of such filesystems are allowed on 438 * kernels that don't support the feature bit. 439 * 440 * InCompat features are features which old kernels will not understand and so 441 * must not mount. 442 * 443 * Log-InCompat features are for changes to log formats or new transactions that 444 * can't be replayed on older kernels. The fields are set when the filesystem is 445 * mounted, and a clean unmount clears the fields. 446 */ 447 #define XFS_SB_FEAT_COMPAT_ALL 0 448 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 449 static inline bool 450 xfs_sb_has_compat_feature( 451 struct xfs_sb *sbp, 452 __uint32_t feature) 453 { 454 return (sbp->sb_features_compat & feature) != 0; 455 } 456 457 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 458 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ 459 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 460 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 461 XFS_SB_FEAT_RO_COMPAT_RMAPBT) 462 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 463 static inline bool 464 xfs_sb_has_ro_compat_feature( 465 struct xfs_sb *sbp, 466 __uint32_t feature) 467 { 468 return (sbp->sb_features_ro_compat & feature) != 0; 469 } 470 471 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 472 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 473 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 474 #define XFS_SB_FEAT_INCOMPAT_ALL \ 475 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 476 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 477 XFS_SB_FEAT_INCOMPAT_META_UUID) 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 int xfs_sb_version_hascrc(struct xfs_sb *sbp) 502 { 503 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 504 } 505 506 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 507 { 508 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 509 } 510 511 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 512 { 513 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 514 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 515 (xfs_sb_version_hasmorebits(sbp) && 516 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 517 } 518 519 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 520 { 521 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 522 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 523 } 524 525 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 526 { 527 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 528 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 529 } 530 531 /* 532 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 533 * is stored separately from the user-visible UUID; this allows the 534 * user-visible UUID to be changed on V5 filesystems which have a 535 * filesystem UUID stamped into every piece of metadata. 536 */ 537 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 538 { 539 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 540 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 541 } 542 543 static inline bool xfs_sb_version_hasrmapbt(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_RMAPBT); 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_padding; /* padding */ 645 646 /* 647 * reserve some contiguous space for future logged fields before we add 648 * the unlogged fields. This makes the range logging via flags and 649 * structure offsets much simpler. 650 */ 651 __be64 agf_spare64[15]; 652 653 /* unlogged fields, written during buffer writeback. */ 654 __be64 agf_lsn; /* last write sequence */ 655 __be32 agf_crc; /* crc of agf sector */ 656 __be32 agf_spare2; 657 658 /* structure must be padded to 64 bit alignment */ 659 } xfs_agf_t; 660 661 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 662 663 #define XFS_AGF_MAGICNUM 0x00000001 664 #define XFS_AGF_VERSIONNUM 0x00000002 665 #define XFS_AGF_SEQNO 0x00000004 666 #define XFS_AGF_LENGTH 0x00000008 667 #define XFS_AGF_ROOTS 0x00000010 668 #define XFS_AGF_LEVELS 0x00000020 669 #define XFS_AGF_FLFIRST 0x00000040 670 #define XFS_AGF_FLLAST 0x00000080 671 #define XFS_AGF_FLCOUNT 0x00000100 672 #define XFS_AGF_FREEBLKS 0x00000200 673 #define XFS_AGF_LONGEST 0x00000400 674 #define XFS_AGF_BTREEBLKS 0x00000800 675 #define XFS_AGF_UUID 0x00001000 676 #define XFS_AGF_RMAP_BLOCKS 0x00002000 677 #define XFS_AGF_NUM_BITS 14 678 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 679 680 #define XFS_AGF_FLAGS \ 681 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 682 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 683 { XFS_AGF_SEQNO, "SEQNO" }, \ 684 { XFS_AGF_LENGTH, "LENGTH" }, \ 685 { XFS_AGF_ROOTS, "ROOTS" }, \ 686 { XFS_AGF_LEVELS, "LEVELS" }, \ 687 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 688 { XFS_AGF_FLLAST, "FLLAST" }, \ 689 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 690 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 691 { XFS_AGF_LONGEST, "LONGEST" }, \ 692 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 693 { XFS_AGF_UUID, "UUID" }, \ 694 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" } 695 696 /* disk block (xfs_daddr_t) in the AG */ 697 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 698 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 699 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 700 701 /* 702 * Size of the unlinked inode hash table in the agi. 703 */ 704 #define XFS_AGI_UNLINKED_BUCKETS 64 705 706 typedef struct xfs_agi { 707 /* 708 * Common allocation group header information 709 */ 710 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 711 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 712 __be32 agi_seqno; /* sequence # starting from 0 */ 713 __be32 agi_length; /* size in blocks of a.g. */ 714 /* 715 * Inode information 716 * Inodes are mapped by interpreting the inode number, so no 717 * mapping data is needed here. 718 */ 719 __be32 agi_count; /* count of allocated inodes */ 720 __be32 agi_root; /* root of inode btree */ 721 __be32 agi_level; /* levels in inode btree */ 722 __be32 agi_freecount; /* number of free inodes */ 723 724 __be32 agi_newino; /* new inode just allocated */ 725 __be32 agi_dirino; /* last directory inode chunk */ 726 /* 727 * Hash table of inodes which have been unlinked but are 728 * still being referenced. 729 */ 730 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 731 /* 732 * This marks the end of logging region 1 and start of logging region 2. 733 */ 734 uuid_t agi_uuid; /* uuid of filesystem */ 735 __be32 agi_crc; /* crc of agi sector */ 736 __be32 agi_pad32; 737 __be64 agi_lsn; /* last write sequence */ 738 739 __be32 agi_free_root; /* root of the free inode btree */ 740 __be32 agi_free_level;/* levels in free inode btree */ 741 742 /* structure must be padded to 64 bit alignment */ 743 } xfs_agi_t; 744 745 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 746 747 #define XFS_AGI_MAGICNUM (1 << 0) 748 #define XFS_AGI_VERSIONNUM (1 << 1) 749 #define XFS_AGI_SEQNO (1 << 2) 750 #define XFS_AGI_LENGTH (1 << 3) 751 #define XFS_AGI_COUNT (1 << 4) 752 #define XFS_AGI_ROOT (1 << 5) 753 #define XFS_AGI_LEVEL (1 << 6) 754 #define XFS_AGI_FREECOUNT (1 << 7) 755 #define XFS_AGI_NEWINO (1 << 8) 756 #define XFS_AGI_DIRINO (1 << 9) 757 #define XFS_AGI_UNLINKED (1 << 10) 758 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 759 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 760 #define XFS_AGI_FREE_ROOT (1 << 11) 761 #define XFS_AGI_FREE_LEVEL (1 << 12) 762 #define XFS_AGI_NUM_BITS_R2 13 763 764 /* disk block (xfs_daddr_t) in the AG */ 765 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 766 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 767 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 768 769 /* 770 * The third a.g. block contains the a.g. freelist, an array 771 * of block pointers to blocks owned by the allocation btree code. 772 */ 773 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 774 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 775 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 776 777 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 778 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 779 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 780 (__be32 *)(bp)->b_addr) 781 782 /* 783 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 784 * slots in the beginning of the block for a proper header with the 785 * location information and CRC. 786 */ 787 #define XFS_AGFL_SIZE(mp) \ 788 (((mp)->m_sb.sb_sectsize - \ 789 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 790 sizeof(struct xfs_agfl) : 0)) / \ 791 sizeof(xfs_agblock_t)) 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 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 850 typedef struct xfs_dinode { 851 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 852 __be16 di_mode; /* mode and type of file */ 853 __u8 di_version; /* inode version */ 854 __u8 di_format; /* format of di_c data */ 855 __be16 di_onlink; /* old number of links to file */ 856 __be32 di_uid; /* owner's user id */ 857 __be32 di_gid; /* owner's group id */ 858 __be32 di_nlink; /* number of links to file */ 859 __be16 di_projid_lo; /* lower part of owner's project id */ 860 __be16 di_projid_hi; /* higher part owner's project id */ 861 __u8 di_pad[6]; /* unused, zeroed space */ 862 __be16 di_flushiter; /* incremented on flush */ 863 xfs_timestamp_t di_atime; /* time last accessed */ 864 xfs_timestamp_t di_mtime; /* time last modified */ 865 xfs_timestamp_t di_ctime; /* time created/inode modified */ 866 __be64 di_size; /* number of bytes in file */ 867 __be64 di_nblocks; /* # of direct & btree blocks used */ 868 __be32 di_extsize; /* basic/minimum extent size for file */ 869 __be32 di_nextents; /* number of extents in data fork */ 870 __be16 di_anextents; /* number of extents in attribute fork*/ 871 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 872 __s8 di_aformat; /* format of attr fork's data */ 873 __be32 di_dmevmask; /* DMIG event mask */ 874 __be16 di_dmstate; /* DMIG state info */ 875 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 876 __be32 di_gen; /* generation number */ 877 878 /* di_next_unlinked is the only non-core field in the old dinode */ 879 __be32 di_next_unlinked;/* agi unlinked list ptr */ 880 881 /* start of the extended dinode, writable fields */ 882 __le32 di_crc; /* CRC of the inode */ 883 __be64 di_changecount; /* number of attribute changes */ 884 __be64 di_lsn; /* flush sequence */ 885 __be64 di_flags2; /* more random flags */ 886 __u8 di_pad2[16]; /* 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 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 915 */ 916 #define XFS_MAXLINK ((1U << 31) - 1U) 917 #define XFS_MAXLINK_1 65535U 918 919 /* 920 * Values for di_format 921 */ 922 typedef enum xfs_dinode_fmt { 923 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 924 XFS_DINODE_FMT_LOCAL, /* bulk data */ 925 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 926 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 927 XFS_DINODE_FMT_UUID /* uuid_t */ 928 } xfs_dinode_fmt_t; 929 930 /* 931 * Inode minimum and maximum sizes. 932 */ 933 #define XFS_DINODE_MIN_LOG 8 934 #define XFS_DINODE_MAX_LOG 11 935 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 936 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 937 938 /* 939 * Inode size for given fs. 940 */ 941 #define XFS_LITINO(mp, version) \ 942 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 943 944 /* 945 * Inode data & attribute fork sizes, per inode. 946 */ 947 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 948 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 949 950 #define XFS_DFORK_DSIZE(dip,mp) \ 951 (XFS_DFORK_Q(dip) ? \ 952 XFS_DFORK_BOFF(dip) : \ 953 XFS_LITINO(mp, (dip)->di_version)) 954 #define XFS_DFORK_ASIZE(dip,mp) \ 955 (XFS_DFORK_Q(dip) ? \ 956 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 957 0) 958 #define XFS_DFORK_SIZE(dip,mp,w) \ 959 ((w) == XFS_DATA_FORK ? \ 960 XFS_DFORK_DSIZE(dip, mp) : \ 961 XFS_DFORK_ASIZE(dip, mp)) 962 963 /* 964 * Return pointers to the data or attribute forks. 965 */ 966 #define XFS_DFORK_DPTR(dip) \ 967 ((char *)dip + xfs_dinode_size(dip->di_version)) 968 #define XFS_DFORK_APTR(dip) \ 969 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 970 #define XFS_DFORK_PTR(dip,w) \ 971 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 972 973 #define XFS_DFORK_FORMAT(dip,w) \ 974 ((w) == XFS_DATA_FORK ? \ 975 (dip)->di_format : \ 976 (dip)->di_aformat) 977 #define XFS_DFORK_NEXTENTS(dip,w) \ 978 ((w) == XFS_DATA_FORK ? \ 979 be32_to_cpu((dip)->di_nextents) : \ 980 be16_to_cpu((dip)->di_anextents)) 981 982 /* 983 * For block and character special files the 32bit dev_t is stored at the 984 * beginning of the data fork. 985 */ 986 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 987 { 988 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 989 } 990 991 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 992 { 993 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 994 } 995 996 /* 997 * Values for di_flags 998 */ 999 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1000 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1001 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1002 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1003 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1004 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1005 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1006 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1007 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1008 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1009 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1010 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1011 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1012 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1013 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1014 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1015 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1016 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1017 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1018 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1019 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1020 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1021 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1022 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1023 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1024 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1025 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1026 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1027 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1028 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1029 1030 #define XFS_DIFLAG_ANY \ 1031 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1032 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1033 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1034 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1035 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1036 1037 /* 1038 * Values for di_flags2 These start by being exposed to userspace in the upper 1039 * 16 bits of the XFS_XFLAG_s range. 1040 */ 1041 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1042 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1043 1044 #define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) 1045 1046 /* 1047 * Inode number format: 1048 * low inopblog bits - offset in block 1049 * next agblklog bits - block number in ag 1050 * next agno_log bits - ag number 1051 * high agno_log-agblklog-inopblog bits - 0 1052 */ 1053 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1054 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1055 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1056 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1057 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1058 #define XFS_INO_BITS(mp) \ 1059 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1060 #define XFS_INO_TO_AGNO(mp,i) \ 1061 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1062 #define XFS_INO_TO_AGINO(mp,i) \ 1063 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1064 #define XFS_INO_TO_AGBNO(mp,i) \ 1065 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1066 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1067 #define XFS_INO_TO_OFFSET(mp,i) \ 1068 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1069 #define XFS_INO_TO_FSB(mp,i) \ 1070 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1071 #define XFS_AGINO_TO_INO(mp,a,i) \ 1072 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1073 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1074 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1075 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1076 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1077 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1078 1079 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1080 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1081 1082 /* 1083 * RealTime Device format definitions 1084 */ 1085 1086 /* Min and max rt extent sizes, specified in bytes */ 1087 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1088 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1089 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1090 1091 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1092 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1093 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1094 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1095 1096 /* 1097 * RT Summary and bit manipulation macros. 1098 */ 1099 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1100 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1101 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1102 #define XFS_SUMPTR(mp,bp,so) \ 1103 ((xfs_suminfo_t *)((bp)->b_addr + \ 1104 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1105 1106 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1107 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1108 #define XFS_BITTOWORD(mp,bi) \ 1109 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1110 1111 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1112 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1113 1114 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1115 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1116 1117 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1118 1119 /* 1120 * Dquot and dquot block format definitions 1121 */ 1122 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1123 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1124 1125 /* 1126 * This is the main portion of the on-disk representation of quota 1127 * information for a user. This is the q_core of the xfs_dquot_t that 1128 * is kept in kernel memory. We pad this with some more expansion room 1129 * to construct the on disk structure. 1130 */ 1131 typedef struct xfs_disk_dquot { 1132 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1133 __u8 d_version; /* dquot version */ 1134 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1135 __be32 d_id; /* user,project,group id */ 1136 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1137 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1138 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1139 __be64 d_ino_softlimit;/* preferred inode limit */ 1140 __be64 d_bcount; /* disk blocks owned by the user */ 1141 __be64 d_icount; /* inodes owned by the user */ 1142 __be32 d_itimer; /* zero if within inode limits if not, 1143 this is when we refuse service */ 1144 __be32 d_btimer; /* similar to above; for disk blocks */ 1145 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1146 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1147 __be32 d_pad0; /* 64 bit align */ 1148 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1149 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1150 __be64 d_rtbcount; /* realtime blocks owned */ 1151 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1152 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1153 __be16 d_pad; 1154 } xfs_disk_dquot_t; 1155 1156 /* 1157 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1158 * carrying the unnecessary padding would be a waste of memory. 1159 */ 1160 typedef struct xfs_dqblk { 1161 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1162 char dd_fill[4]; /* filling for posterity */ 1163 1164 /* 1165 * These two are only present on filesystems with the CRC bits set. 1166 */ 1167 __be32 dd_crc; /* checksum */ 1168 __be64 dd_lsn; /* last modification in log */ 1169 uuid_t dd_uuid; /* location information */ 1170 } xfs_dqblk_t; 1171 1172 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1173 1174 /* 1175 * Remote symlink format and access functions. 1176 */ 1177 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1178 1179 struct xfs_dsymlink_hdr { 1180 __be32 sl_magic; 1181 __be32 sl_offset; 1182 __be32 sl_bytes; 1183 __be32 sl_crc; 1184 uuid_t sl_uuid; 1185 __be64 sl_owner; 1186 __be64 sl_blkno; 1187 __be64 sl_lsn; 1188 }; 1189 1190 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1191 1192 /* 1193 * The maximum pathlen is 1024 bytes. Since the minimum file system 1194 * blocksize is 512 bytes, we can get a max of 3 extents back from 1195 * bmapi when crc headers are taken into account. 1196 */ 1197 #define XFS_SYMLINK_MAPS 3 1198 1199 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1200 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1201 sizeof(struct xfs_dsymlink_hdr) : 0)) 1202 1203 1204 /* 1205 * Allocation Btree format definitions 1206 * 1207 * There are two on-disk btrees, one sorted by blockno and one sorted 1208 * by blockcount and blockno. All blocks look the same to make the code 1209 * simpler; if we have time later, we'll make the optimizations. 1210 */ 1211 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1212 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1213 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1214 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1215 1216 /* 1217 * Data record/key structure 1218 */ 1219 typedef struct xfs_alloc_rec { 1220 __be32 ar_startblock; /* starting block number */ 1221 __be32 ar_blockcount; /* count of free blocks */ 1222 } xfs_alloc_rec_t, xfs_alloc_key_t; 1223 1224 typedef struct xfs_alloc_rec_incore { 1225 xfs_agblock_t ar_startblock; /* starting block number */ 1226 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1227 } xfs_alloc_rec_incore_t; 1228 1229 /* btree pointer type */ 1230 typedef __be32 xfs_alloc_ptr_t; 1231 1232 /* 1233 * Block numbers in the AG: 1234 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1235 */ 1236 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1237 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1238 1239 1240 /* 1241 * Inode Allocation Btree format definitions 1242 * 1243 * There is a btree for the inode map per allocation group. 1244 */ 1245 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1246 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1247 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1248 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1249 1250 typedef __uint64_t xfs_inofree_t; 1251 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1252 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1253 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1254 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1255 1256 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1257 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1258 #define XFS_INODES_PER_HOLEMASK_BIT \ 1259 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1260 1261 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1262 { 1263 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1264 } 1265 1266 /* 1267 * The on-disk inode record structure has two formats. The original "full" 1268 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1269 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1270 * count. 1271 * 1272 * The holemask of the sparse record format allows an inode chunk to have holes 1273 * that refer to blocks not owned by the inode record. This facilitates inode 1274 * allocation in the event of severe free space fragmentation. 1275 */ 1276 typedef struct xfs_inobt_rec { 1277 __be32 ir_startino; /* starting inode number */ 1278 union { 1279 struct { 1280 __be32 ir_freecount; /* count of free inodes */ 1281 } f; 1282 struct { 1283 __be16 ir_holemask;/* hole mask for sparse chunks */ 1284 __u8 ir_count; /* total inode count */ 1285 __u8 ir_freecount; /* count of free inodes */ 1286 } sp; 1287 } ir_u; 1288 __be64 ir_free; /* free inode mask */ 1289 } xfs_inobt_rec_t; 1290 1291 typedef struct xfs_inobt_rec_incore { 1292 xfs_agino_t ir_startino; /* starting inode number */ 1293 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1294 __uint8_t ir_count; /* total inode count */ 1295 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1296 xfs_inofree_t ir_free; /* free inode mask */ 1297 } xfs_inobt_rec_incore_t; 1298 1299 static inline bool xfs_inobt_issparse(uint16_t holemask) 1300 { 1301 /* non-zero holemask represents a sparse rec. */ 1302 return holemask; 1303 } 1304 1305 /* 1306 * Key structure 1307 */ 1308 typedef struct xfs_inobt_key { 1309 __be32 ir_startino; /* starting inode number */ 1310 } xfs_inobt_key_t; 1311 1312 /* btree pointer type */ 1313 typedef __be32 xfs_inobt_ptr_t; 1314 1315 /* 1316 * block numbers in the AG. 1317 */ 1318 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1319 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1320 1321 /* 1322 * Reverse mapping btree format definitions 1323 * 1324 * There is a btree for the reverse map per allocation group 1325 */ 1326 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1327 1328 /* 1329 * Ownership info for an extent. This is used to create reverse-mapping 1330 * entries. 1331 */ 1332 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1333 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1334 struct xfs_owner_info { 1335 uint64_t oi_owner; 1336 xfs_fileoff_t oi_offset; 1337 unsigned int oi_flags; 1338 }; 1339 1340 /* 1341 * Special owner types. 1342 * 1343 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1344 * to tell us we have a special owner value. We use these for static metadata 1345 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1346 */ 1347 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1348 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1349 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1350 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1351 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1352 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1353 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1354 #define XFS_RMAP_OWN_MIN (-8ULL) /* guard */ 1355 1356 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1357 1358 /* 1359 * Data record structure 1360 */ 1361 struct xfs_rmap_rec { 1362 __be32 rm_startblock; /* extent start block */ 1363 __be32 rm_blockcount; /* extent length */ 1364 __be64 rm_owner; /* extent owner */ 1365 __be64 rm_offset; /* offset within the owner */ 1366 }; 1367 1368 /* 1369 * rmap btree record 1370 * rm_offset:63 is the attribute fork flag 1371 * rm_offset:62 is the bmbt block flag 1372 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1373 * rm_offset:54-60 aren't used and should be zero 1374 * rm_offset:0-53 is the block offset within the inode 1375 */ 1376 #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) 1377 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) 1378 #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) 1379 1380 #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) 1381 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1382 XFS_RMAP_OFF_BMBT_BLOCK | \ 1383 XFS_RMAP_OFF_UNWRITTEN) 1384 #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) 1385 1386 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1387 1388 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1389 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1390 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1391 1392 #define RMAPBT_STARTBLOCK_BITLEN 32 1393 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1394 #define RMAPBT_OWNER_BITLEN 64 1395 #define RMAPBT_ATTRFLAG_BITLEN 1 1396 #define RMAPBT_BMBTFLAG_BITLEN 1 1397 #define RMAPBT_EXNTFLAG_BITLEN 1 1398 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1399 #define RMAPBT_OFFSET_BITLEN 54 1400 1401 #define XFS_RMAP_ATTR_FORK (1 << 0) 1402 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1403 #define XFS_RMAP_UNWRITTEN (1 << 2) 1404 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1405 XFS_RMAP_BMBT_BLOCK) 1406 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1407 struct xfs_rmap_irec { 1408 xfs_agblock_t rm_startblock; /* extent start block */ 1409 xfs_extlen_t rm_blockcount; /* extent length */ 1410 __uint64_t rm_owner; /* extent owner */ 1411 __uint64_t rm_offset; /* offset within the owner */ 1412 unsigned int rm_flags; /* state flags */ 1413 }; 1414 1415 /* 1416 * Key structure 1417 * 1418 * We don't use the length for lookups 1419 */ 1420 struct xfs_rmap_key { 1421 __be32 rm_startblock; /* extent start block */ 1422 __be64 rm_owner; /* extent owner */ 1423 __be64 rm_offset; /* offset within the owner */ 1424 } __attribute__((packed)); 1425 1426 /* btree pointer type */ 1427 typedef __be32 xfs_rmap_ptr_t; 1428 1429 #define XFS_RMAP_BLOCK(mp) \ 1430 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1431 XFS_FIBT_BLOCK(mp) + 1 : \ 1432 XFS_IBT_BLOCK(mp) + 1) 1433 1434 /* 1435 * BMAP Btree format definitions 1436 * 1437 * This includes both the root block definition that sits inside an inode fork 1438 * and the record/pointer formats for the leaf/node in the blocks. 1439 */ 1440 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1441 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1442 1443 /* 1444 * Bmap root header, on-disk form only. 1445 */ 1446 typedef struct xfs_bmdr_block { 1447 __be16 bb_level; /* 0 is a leaf */ 1448 __be16 bb_numrecs; /* current # of data records */ 1449 } xfs_bmdr_block_t; 1450 1451 /* 1452 * Bmap btree record and extent descriptor. 1453 * l0:63 is an extent flag (value 1 indicates non-normal). 1454 * l0:9-62 are startoff. 1455 * l0:0-8 and l1:21-63 are startblock. 1456 * l1:0-20 are blockcount. 1457 */ 1458 #define BMBT_EXNTFLAG_BITLEN 1 1459 #define BMBT_STARTOFF_BITLEN 54 1460 #define BMBT_STARTBLOCK_BITLEN 52 1461 #define BMBT_BLOCKCOUNT_BITLEN 21 1462 1463 typedef struct xfs_bmbt_rec { 1464 __be64 l0, l1; 1465 } xfs_bmbt_rec_t; 1466 1467 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1468 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1469 1470 typedef struct xfs_bmbt_rec_host { 1471 __uint64_t l0, l1; 1472 } xfs_bmbt_rec_host_t; 1473 1474 /* 1475 * Values and macros for delayed-allocation startblock fields. 1476 */ 1477 #define STARTBLOCKVALBITS 17 1478 #define STARTBLOCKMASKBITS (15 + 20) 1479 #define STARTBLOCKMASK \ 1480 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1481 1482 static inline int isnullstartblock(xfs_fsblock_t x) 1483 { 1484 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1485 } 1486 1487 static inline xfs_fsblock_t nullstartblock(int k) 1488 { 1489 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1490 return STARTBLOCKMASK | (k); 1491 } 1492 1493 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1494 { 1495 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1496 } 1497 1498 /* 1499 * Possible extent formats. 1500 */ 1501 typedef enum { 1502 XFS_EXTFMT_NOSTATE = 0, 1503 XFS_EXTFMT_HASSTATE 1504 } xfs_exntfmt_t; 1505 1506 /* 1507 * Possible extent states. 1508 */ 1509 typedef enum { 1510 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1511 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1512 } xfs_exntst_t; 1513 1514 /* 1515 * Incore version of above. 1516 */ 1517 typedef struct xfs_bmbt_irec 1518 { 1519 xfs_fileoff_t br_startoff; /* starting file offset */ 1520 xfs_fsblock_t br_startblock; /* starting block number */ 1521 xfs_filblks_t br_blockcount; /* number of blocks */ 1522 xfs_exntst_t br_state; /* extent state */ 1523 } xfs_bmbt_irec_t; 1524 1525 /* 1526 * Key structure for non-leaf levels of the tree. 1527 */ 1528 typedef struct xfs_bmbt_key { 1529 __be64 br_startoff; /* starting file offset */ 1530 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1531 1532 /* btree pointer type */ 1533 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1534 1535 1536 /* 1537 * Generic Btree block format definitions 1538 * 1539 * This is a combination of the actual format used on disk for short and long 1540 * format btrees. The first three fields are shared by both format, but the 1541 * pointers are different and should be used with care. 1542 * 1543 * To get the size of the actual short or long form headers please use the size 1544 * macros below. Never use sizeof(xfs_btree_block). 1545 * 1546 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1547 * with the crc feature bit, and all accesses to them must be conditional on 1548 * that flag. 1549 */ 1550 /* short form block header */ 1551 struct xfs_btree_block_shdr { 1552 __be32 bb_leftsib; 1553 __be32 bb_rightsib; 1554 1555 __be64 bb_blkno; 1556 __be64 bb_lsn; 1557 uuid_t bb_uuid; 1558 __be32 bb_owner; 1559 __le32 bb_crc; 1560 }; 1561 1562 /* long form block header */ 1563 struct xfs_btree_block_lhdr { 1564 __be64 bb_leftsib; 1565 __be64 bb_rightsib; 1566 1567 __be64 bb_blkno; 1568 __be64 bb_lsn; 1569 uuid_t bb_uuid; 1570 __be64 bb_owner; 1571 __le32 bb_crc; 1572 __be32 bb_pad; /* padding for alignment */ 1573 }; 1574 1575 struct xfs_btree_block { 1576 __be32 bb_magic; /* magic number for block type */ 1577 __be16 bb_level; /* 0 is a leaf */ 1578 __be16 bb_numrecs; /* current # of data records */ 1579 union { 1580 struct xfs_btree_block_shdr s; 1581 struct xfs_btree_block_lhdr l; 1582 } bb_u; /* rest */ 1583 }; 1584 1585 /* size of a short form block */ 1586 #define XFS_BTREE_SBLOCK_LEN \ 1587 (offsetof(struct xfs_btree_block, bb_u) + \ 1588 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1589 /* size of a long form block */ 1590 #define XFS_BTREE_LBLOCK_LEN \ 1591 (offsetof(struct xfs_btree_block, bb_u) + \ 1592 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1593 1594 /* sizes of CRC enabled btree blocks */ 1595 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1596 (offsetof(struct xfs_btree_block, bb_u) + \ 1597 sizeof(struct xfs_btree_block_shdr)) 1598 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1599 (offsetof(struct xfs_btree_block, bb_u) + \ 1600 sizeof(struct xfs_btree_block_lhdr)) 1601 1602 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1603 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1604 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1605 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1606 1607 /* 1608 * On-disk XFS access control list structure. 1609 */ 1610 struct xfs_acl_entry { 1611 __be32 ae_tag; 1612 __be32 ae_id; 1613 __be16 ae_perm; 1614 __be16 ae_pad; /* fill the implicit hole in the structure */ 1615 }; 1616 1617 struct xfs_acl { 1618 __be32 acl_cnt; 1619 struct xfs_acl_entry acl_entry[0]; 1620 }; 1621 1622 /* 1623 * The number of ACL entries allowed is defined by the on-disk format. 1624 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1625 * limited only by the maximum size of the xattr that stores the information. 1626 */ 1627 #define XFS_ACL_MAX_ENTRIES(mp) \ 1628 (xfs_sb_version_hascrc(&mp->m_sb) \ 1629 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1630 sizeof(struct xfs_acl_entry) \ 1631 : 25) 1632 1633 #define XFS_ACL_SIZE(cnt) \ 1634 (sizeof(struct xfs_acl) + \ 1635 sizeof(struct xfs_acl_entry) * cnt) 1636 1637 #define XFS_ACL_MAX_SIZE(mp) \ 1638 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1639 1640 1641 /* On-disk XFS extended attribute names */ 1642 #define SGI_ACL_FILE "SGI_ACL_FILE" 1643 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1644 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1645 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1646 1647 #endif /* __XFS_FORMAT_H__ */ 1648