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_SPARE64 0x00004000 678 #define XFS_AGF_NUM_BITS 15 679 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 680 681 #define XFS_AGF_FLAGS \ 682 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 683 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 684 { XFS_AGF_SEQNO, "SEQNO" }, \ 685 { XFS_AGF_LENGTH, "LENGTH" }, \ 686 { XFS_AGF_ROOTS, "ROOTS" }, \ 687 { XFS_AGF_LEVELS, "LEVELS" }, \ 688 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 689 { XFS_AGF_FLLAST, "FLLAST" }, \ 690 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 691 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 692 { XFS_AGF_LONGEST, "LONGEST" }, \ 693 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 694 { XFS_AGF_UUID, "UUID" }, \ 695 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 696 { XFS_AGF_SPARE64, "SPARE64" } 697 698 /* disk block (xfs_daddr_t) in the AG */ 699 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 700 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 701 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 702 703 /* 704 * Size of the unlinked inode hash table in the agi. 705 */ 706 #define XFS_AGI_UNLINKED_BUCKETS 64 707 708 typedef struct xfs_agi { 709 /* 710 * Common allocation group header information 711 */ 712 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 713 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 714 __be32 agi_seqno; /* sequence # starting from 0 */ 715 __be32 agi_length; /* size in blocks of a.g. */ 716 /* 717 * Inode information 718 * Inodes are mapped by interpreting the inode number, so no 719 * mapping data is needed here. 720 */ 721 __be32 agi_count; /* count of allocated inodes */ 722 __be32 agi_root; /* root of inode btree */ 723 __be32 agi_level; /* levels in inode btree */ 724 __be32 agi_freecount; /* number of free inodes */ 725 726 __be32 agi_newino; /* new inode just allocated */ 727 __be32 agi_dirino; /* last directory inode chunk */ 728 /* 729 * Hash table of inodes which have been unlinked but are 730 * still being referenced. 731 */ 732 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 733 /* 734 * This marks the end of logging region 1 and start of logging region 2. 735 */ 736 uuid_t agi_uuid; /* uuid of filesystem */ 737 __be32 agi_crc; /* crc of agi sector */ 738 __be32 agi_pad32; 739 __be64 agi_lsn; /* last write sequence */ 740 741 __be32 agi_free_root; /* root of the free inode btree */ 742 __be32 agi_free_level;/* levels in free inode btree */ 743 744 /* structure must be padded to 64 bit alignment */ 745 } xfs_agi_t; 746 747 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 748 749 #define XFS_AGI_MAGICNUM (1 << 0) 750 #define XFS_AGI_VERSIONNUM (1 << 1) 751 #define XFS_AGI_SEQNO (1 << 2) 752 #define XFS_AGI_LENGTH (1 << 3) 753 #define XFS_AGI_COUNT (1 << 4) 754 #define XFS_AGI_ROOT (1 << 5) 755 #define XFS_AGI_LEVEL (1 << 6) 756 #define XFS_AGI_FREECOUNT (1 << 7) 757 #define XFS_AGI_NEWINO (1 << 8) 758 #define XFS_AGI_DIRINO (1 << 9) 759 #define XFS_AGI_UNLINKED (1 << 10) 760 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 761 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 762 #define XFS_AGI_FREE_ROOT (1 << 11) 763 #define XFS_AGI_FREE_LEVEL (1 << 12) 764 #define XFS_AGI_NUM_BITS_R2 13 765 766 /* disk block (xfs_daddr_t) in the AG */ 767 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 768 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 769 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 770 771 /* 772 * The third a.g. block contains the a.g. freelist, an array 773 * of block pointers to blocks owned by the allocation btree code. 774 */ 775 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 776 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 777 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 778 779 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 780 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 781 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 782 (__be32 *)(bp)->b_addr) 783 784 /* 785 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 786 * slots in the beginning of the block for a proper header with the 787 * location information and CRC. 788 */ 789 #define XFS_AGFL_SIZE(mp) \ 790 (((mp)->m_sb.sb_sectsize - \ 791 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 792 sizeof(struct xfs_agfl) : 0)) / \ 793 sizeof(xfs_agblock_t)) 794 795 typedef struct xfs_agfl { 796 __be32 agfl_magicnum; 797 __be32 agfl_seqno; 798 uuid_t agfl_uuid; 799 __be64 agfl_lsn; 800 __be32 agfl_crc; 801 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 802 } __attribute__((packed)) xfs_agfl_t; 803 804 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 805 806 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 807 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 808 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 809 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 810 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 811 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 812 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 813 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 814 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 815 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 816 817 /* 818 * For checking for bad ranges of xfs_daddr_t's, covering multiple 819 * allocation groups or a single xfs_daddr_t that's a superblock copy. 820 */ 821 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 822 ((len) == 1 ? \ 823 ASSERT((d) == XFS_SB_DADDR || \ 824 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 825 ASSERT(xfs_daddr_to_agno(mp, d) == \ 826 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 827 828 typedef struct xfs_timestamp { 829 __be32 t_sec; /* timestamp seconds */ 830 __be32 t_nsec; /* timestamp nanoseconds */ 831 } xfs_timestamp_t; 832 833 /* 834 * On-disk inode structure. 835 * 836 * This is just the header or "dinode core", the inode is expanded to fill a 837 * variable size the leftover area split into a data and an attribute fork. 838 * The format of the data and attribute fork depends on the format of the 839 * inode as indicated by di_format and di_aformat. To access the data and 840 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 841 * below. 842 * 843 * There is a very similar struct icdinode in xfs_inode which matches the 844 * layout of the first 96 bytes of this structure, but is kept in native 845 * format instead of big endian. 846 * 847 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 848 * padding field for v3 inodes. 849 */ 850 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 851 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 852 typedef struct xfs_dinode { 853 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 854 __be16 di_mode; /* mode and type of file */ 855 __u8 di_version; /* inode version */ 856 __u8 di_format; /* format of di_c data */ 857 __be16 di_onlink; /* old number of links to file */ 858 __be32 di_uid; /* owner's user id */ 859 __be32 di_gid; /* owner's group id */ 860 __be32 di_nlink; /* number of links to file */ 861 __be16 di_projid_lo; /* lower part of owner's project id */ 862 __be16 di_projid_hi; /* higher part owner's project id */ 863 __u8 di_pad[6]; /* unused, zeroed space */ 864 __be16 di_flushiter; /* incremented on flush */ 865 xfs_timestamp_t di_atime; /* time last accessed */ 866 xfs_timestamp_t di_mtime; /* time last modified */ 867 xfs_timestamp_t di_ctime; /* time created/inode modified */ 868 __be64 di_size; /* number of bytes in file */ 869 __be64 di_nblocks; /* # of direct & btree blocks used */ 870 __be32 di_extsize; /* basic/minimum extent size for file */ 871 __be32 di_nextents; /* number of extents in data fork */ 872 __be16 di_anextents; /* number of extents in attribute fork*/ 873 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 874 __s8 di_aformat; /* format of attr fork's data */ 875 __be32 di_dmevmask; /* DMIG event mask */ 876 __be16 di_dmstate; /* DMIG state info */ 877 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 878 __be32 di_gen; /* generation number */ 879 880 /* di_next_unlinked is the only non-core field in the old dinode */ 881 __be32 di_next_unlinked;/* agi unlinked list ptr */ 882 883 /* start of the extended dinode, writable fields */ 884 __le32 di_crc; /* CRC of the inode */ 885 __be64 di_changecount; /* number of attribute changes */ 886 __be64 di_lsn; /* flush sequence */ 887 __be64 di_flags2; /* more random flags */ 888 __u8 di_pad2[16]; /* more padding for future expansion */ 889 890 /* fields only written to during inode creation */ 891 xfs_timestamp_t di_crtime; /* time created */ 892 __be64 di_ino; /* inode number */ 893 uuid_t di_uuid; /* UUID of the filesystem */ 894 895 /* structure must be padded to 64 bit alignment */ 896 } xfs_dinode_t; 897 898 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 899 900 #define DI_MAX_FLUSH 0xffff 901 902 /* 903 * Size of the core inode on disk. Version 1 and 2 inodes have 904 * the same size, but version 3 has grown a few additional fields. 905 */ 906 static inline uint xfs_dinode_size(int version) 907 { 908 if (version == 3) 909 return sizeof(struct xfs_dinode); 910 return offsetof(struct xfs_dinode, di_crc); 911 } 912 913 /* 914 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 915 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 916 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 917 */ 918 #define XFS_MAXLINK ((1U << 31) - 1U) 919 #define XFS_MAXLINK_1 65535U 920 921 /* 922 * Values for di_format 923 */ 924 typedef enum xfs_dinode_fmt { 925 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 926 XFS_DINODE_FMT_LOCAL, /* bulk data */ 927 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 928 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 929 XFS_DINODE_FMT_UUID /* uuid_t */ 930 } xfs_dinode_fmt_t; 931 932 /* 933 * Inode minimum and maximum sizes. 934 */ 935 #define XFS_DINODE_MIN_LOG 8 936 #define XFS_DINODE_MAX_LOG 11 937 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 938 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 939 940 /* 941 * Inode size for given fs. 942 */ 943 #define XFS_LITINO(mp, version) \ 944 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 945 946 /* 947 * Inode data & attribute fork sizes, per inode. 948 */ 949 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 950 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 951 952 #define XFS_DFORK_DSIZE(dip,mp) \ 953 (XFS_DFORK_Q(dip) ? \ 954 XFS_DFORK_BOFF(dip) : \ 955 XFS_LITINO(mp, (dip)->di_version)) 956 #define XFS_DFORK_ASIZE(dip,mp) \ 957 (XFS_DFORK_Q(dip) ? \ 958 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 959 0) 960 #define XFS_DFORK_SIZE(dip,mp,w) \ 961 ((w) == XFS_DATA_FORK ? \ 962 XFS_DFORK_DSIZE(dip, mp) : \ 963 XFS_DFORK_ASIZE(dip, mp)) 964 965 /* 966 * Return pointers to the data or attribute forks. 967 */ 968 #define XFS_DFORK_DPTR(dip) \ 969 ((char *)dip + xfs_dinode_size(dip->di_version)) 970 #define XFS_DFORK_APTR(dip) \ 971 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 972 #define XFS_DFORK_PTR(dip,w) \ 973 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 974 975 #define XFS_DFORK_FORMAT(dip,w) \ 976 ((w) == XFS_DATA_FORK ? \ 977 (dip)->di_format : \ 978 (dip)->di_aformat) 979 #define XFS_DFORK_NEXTENTS(dip,w) \ 980 ((w) == XFS_DATA_FORK ? \ 981 be32_to_cpu((dip)->di_nextents) : \ 982 be16_to_cpu((dip)->di_anextents)) 983 984 /* 985 * For block and character special files the 32bit dev_t is stored at the 986 * beginning of the data fork. 987 */ 988 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 989 { 990 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 991 } 992 993 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 994 { 995 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 996 } 997 998 /* 999 * Values for di_flags 1000 */ 1001 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1002 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1003 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1004 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1005 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1006 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1007 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1008 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1009 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1010 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1011 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1012 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1013 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1014 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1015 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1016 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1017 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1018 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1019 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1020 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1021 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1022 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1023 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1024 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1025 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1026 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1027 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1028 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1029 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1030 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1031 1032 #define XFS_DIFLAG_ANY \ 1033 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1034 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1035 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1036 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1037 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1038 1039 /* 1040 * Values for di_flags2 These start by being exposed to userspace in the upper 1041 * 16 bits of the XFS_XFLAG_s range. 1042 */ 1043 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1044 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1045 1046 #define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) 1047 1048 /* 1049 * Inode number format: 1050 * low inopblog bits - offset in block 1051 * next agblklog bits - block number in ag 1052 * next agno_log bits - ag number 1053 * high agno_log-agblklog-inopblog bits - 0 1054 */ 1055 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1056 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1057 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1058 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1059 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1060 #define XFS_INO_BITS(mp) \ 1061 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1062 #define XFS_INO_TO_AGNO(mp,i) \ 1063 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1064 #define XFS_INO_TO_AGINO(mp,i) \ 1065 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1066 #define XFS_INO_TO_AGBNO(mp,i) \ 1067 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1068 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1069 #define XFS_INO_TO_OFFSET(mp,i) \ 1070 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1071 #define XFS_INO_TO_FSB(mp,i) \ 1072 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1073 #define XFS_AGINO_TO_INO(mp,a,i) \ 1074 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1075 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1076 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1077 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1078 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1079 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1080 1081 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1082 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1083 1084 /* 1085 * RealTime Device format definitions 1086 */ 1087 1088 /* Min and max rt extent sizes, specified in bytes */ 1089 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1090 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1091 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1092 1093 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1094 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1095 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1096 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1097 1098 /* 1099 * RT Summary and bit manipulation macros. 1100 */ 1101 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1102 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1103 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1104 #define XFS_SUMPTR(mp,bp,so) \ 1105 ((xfs_suminfo_t *)((bp)->b_addr + \ 1106 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1107 1108 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1109 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1110 #define XFS_BITTOWORD(mp,bi) \ 1111 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1112 1113 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1114 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1115 1116 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1117 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1118 1119 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1120 1121 /* 1122 * Dquot and dquot block format definitions 1123 */ 1124 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1125 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1126 1127 /* 1128 * This is the main portion of the on-disk representation of quota 1129 * information for a user. This is the q_core of the xfs_dquot_t that 1130 * is kept in kernel memory. We pad this with some more expansion room 1131 * to construct the on disk structure. 1132 */ 1133 typedef struct xfs_disk_dquot { 1134 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1135 __u8 d_version; /* dquot version */ 1136 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1137 __be32 d_id; /* user,project,group id */ 1138 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1139 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1140 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1141 __be64 d_ino_softlimit;/* preferred inode limit */ 1142 __be64 d_bcount; /* disk blocks owned by the user */ 1143 __be64 d_icount; /* inodes owned by the user */ 1144 __be32 d_itimer; /* zero if within inode limits if not, 1145 this is when we refuse service */ 1146 __be32 d_btimer; /* similar to above; for disk blocks */ 1147 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1148 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1149 __be32 d_pad0; /* 64 bit align */ 1150 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1151 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1152 __be64 d_rtbcount; /* realtime blocks owned */ 1153 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1154 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1155 __be16 d_pad; 1156 } xfs_disk_dquot_t; 1157 1158 /* 1159 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1160 * carrying the unnecessary padding would be a waste of memory. 1161 */ 1162 typedef struct xfs_dqblk { 1163 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1164 char dd_fill[4]; /* filling for posterity */ 1165 1166 /* 1167 * These two are only present on filesystems with the CRC bits set. 1168 */ 1169 __be32 dd_crc; /* checksum */ 1170 __be64 dd_lsn; /* last modification in log */ 1171 uuid_t dd_uuid; /* location information */ 1172 } xfs_dqblk_t; 1173 1174 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1175 1176 /* 1177 * Remote symlink format and access functions. 1178 */ 1179 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1180 1181 struct xfs_dsymlink_hdr { 1182 __be32 sl_magic; 1183 __be32 sl_offset; 1184 __be32 sl_bytes; 1185 __be32 sl_crc; 1186 uuid_t sl_uuid; 1187 __be64 sl_owner; 1188 __be64 sl_blkno; 1189 __be64 sl_lsn; 1190 }; 1191 1192 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1193 1194 /* 1195 * The maximum pathlen is 1024 bytes. Since the minimum file system 1196 * blocksize is 512 bytes, we can get a max of 3 extents back from 1197 * bmapi when crc headers are taken into account. 1198 */ 1199 #define XFS_SYMLINK_MAPS 3 1200 1201 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1202 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1203 sizeof(struct xfs_dsymlink_hdr) : 0)) 1204 1205 1206 /* 1207 * Allocation Btree format definitions 1208 * 1209 * There are two on-disk btrees, one sorted by blockno and one sorted 1210 * by blockcount and blockno. All blocks look the same to make the code 1211 * simpler; if we have time later, we'll make the optimizations. 1212 */ 1213 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1214 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1215 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1216 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1217 1218 /* 1219 * Data record/key structure 1220 */ 1221 typedef struct xfs_alloc_rec { 1222 __be32 ar_startblock; /* starting block number */ 1223 __be32 ar_blockcount; /* count of free blocks */ 1224 } xfs_alloc_rec_t, xfs_alloc_key_t; 1225 1226 typedef struct xfs_alloc_rec_incore { 1227 xfs_agblock_t ar_startblock; /* starting block number */ 1228 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1229 } xfs_alloc_rec_incore_t; 1230 1231 /* btree pointer type */ 1232 typedef __be32 xfs_alloc_ptr_t; 1233 1234 /* 1235 * Block numbers in the AG: 1236 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1237 */ 1238 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1239 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1240 1241 1242 /* 1243 * Inode Allocation Btree format definitions 1244 * 1245 * There is a btree for the inode map per allocation group. 1246 */ 1247 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1248 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1249 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1250 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1251 1252 typedef __uint64_t xfs_inofree_t; 1253 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1254 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1255 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1256 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1257 1258 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1259 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1260 #define XFS_INODES_PER_HOLEMASK_BIT \ 1261 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1262 1263 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1264 { 1265 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1266 } 1267 1268 /* 1269 * The on-disk inode record structure has two formats. The original "full" 1270 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1271 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1272 * count. 1273 * 1274 * The holemask of the sparse record format allows an inode chunk to have holes 1275 * that refer to blocks not owned by the inode record. This facilitates inode 1276 * allocation in the event of severe free space fragmentation. 1277 */ 1278 typedef struct xfs_inobt_rec { 1279 __be32 ir_startino; /* starting inode number */ 1280 union { 1281 struct { 1282 __be32 ir_freecount; /* count of free inodes */ 1283 } f; 1284 struct { 1285 __be16 ir_holemask;/* hole mask for sparse chunks */ 1286 __u8 ir_count; /* total inode count */ 1287 __u8 ir_freecount; /* count of free inodes */ 1288 } sp; 1289 } ir_u; 1290 __be64 ir_free; /* free inode mask */ 1291 } xfs_inobt_rec_t; 1292 1293 typedef struct xfs_inobt_rec_incore { 1294 xfs_agino_t ir_startino; /* starting inode number */ 1295 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1296 __uint8_t ir_count; /* total inode count */ 1297 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1298 xfs_inofree_t ir_free; /* free inode mask */ 1299 } xfs_inobt_rec_incore_t; 1300 1301 static inline bool xfs_inobt_issparse(uint16_t holemask) 1302 { 1303 /* non-zero holemask represents a sparse rec. */ 1304 return holemask; 1305 } 1306 1307 /* 1308 * Key structure 1309 */ 1310 typedef struct xfs_inobt_key { 1311 __be32 ir_startino; /* starting inode number */ 1312 } xfs_inobt_key_t; 1313 1314 /* btree pointer type */ 1315 typedef __be32 xfs_inobt_ptr_t; 1316 1317 /* 1318 * block numbers in the AG. 1319 */ 1320 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1321 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1322 1323 /* 1324 * Reverse mapping btree format definitions 1325 * 1326 * There is a btree for the reverse map per allocation group 1327 */ 1328 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1329 1330 /* 1331 * Ownership info for an extent. This is used to create reverse-mapping 1332 * entries. 1333 */ 1334 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1335 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1336 struct xfs_owner_info { 1337 uint64_t oi_owner; 1338 xfs_fileoff_t oi_offset; 1339 unsigned int oi_flags; 1340 }; 1341 1342 /* 1343 * Special owner types. 1344 * 1345 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1346 * to tell us we have a special owner value. We use these for static metadata 1347 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1348 */ 1349 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1350 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1351 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1352 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1353 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1354 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1355 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1356 #define XFS_RMAP_OWN_MIN (-8ULL) /* guard */ 1357 1358 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1359 1360 /* 1361 * Data record structure 1362 */ 1363 struct xfs_rmap_rec { 1364 __be32 rm_startblock; /* extent start block */ 1365 __be32 rm_blockcount; /* extent length */ 1366 __be64 rm_owner; /* extent owner */ 1367 __be64 rm_offset; /* offset within the owner */ 1368 }; 1369 1370 /* 1371 * rmap btree record 1372 * rm_offset:63 is the attribute fork flag 1373 * rm_offset:62 is the bmbt block flag 1374 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1375 * rm_offset:54-60 aren't used and should be zero 1376 * rm_offset:0-53 is the block offset within the inode 1377 */ 1378 #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) 1379 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) 1380 #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) 1381 1382 #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) 1383 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1384 XFS_RMAP_OFF_BMBT_BLOCK | \ 1385 XFS_RMAP_OFF_UNWRITTEN) 1386 #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) 1387 1388 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1389 1390 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1391 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1392 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1393 1394 #define RMAPBT_STARTBLOCK_BITLEN 32 1395 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1396 #define RMAPBT_OWNER_BITLEN 64 1397 #define RMAPBT_ATTRFLAG_BITLEN 1 1398 #define RMAPBT_BMBTFLAG_BITLEN 1 1399 #define RMAPBT_EXNTFLAG_BITLEN 1 1400 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1401 #define RMAPBT_OFFSET_BITLEN 54 1402 1403 #define XFS_RMAP_ATTR_FORK (1 << 0) 1404 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1405 #define XFS_RMAP_UNWRITTEN (1 << 2) 1406 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1407 XFS_RMAP_BMBT_BLOCK) 1408 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1409 struct xfs_rmap_irec { 1410 xfs_agblock_t rm_startblock; /* extent start block */ 1411 xfs_extlen_t rm_blockcount; /* extent length */ 1412 __uint64_t rm_owner; /* extent owner */ 1413 __uint64_t rm_offset; /* offset within the owner */ 1414 unsigned int rm_flags; /* state flags */ 1415 }; 1416 1417 /* 1418 * Key structure 1419 * 1420 * We don't use the length for lookups 1421 */ 1422 struct xfs_rmap_key { 1423 __be32 rm_startblock; /* extent start block */ 1424 __be64 rm_owner; /* extent owner */ 1425 __be64 rm_offset; /* offset within the owner */ 1426 } __attribute__((packed)); 1427 1428 /* btree pointer type */ 1429 typedef __be32 xfs_rmap_ptr_t; 1430 1431 #define XFS_RMAP_BLOCK(mp) \ 1432 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1433 XFS_FIBT_BLOCK(mp) + 1 : \ 1434 XFS_IBT_BLOCK(mp) + 1) 1435 1436 /* 1437 * BMAP Btree format definitions 1438 * 1439 * This includes both the root block definition that sits inside an inode fork 1440 * and the record/pointer formats for the leaf/node in the blocks. 1441 */ 1442 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1443 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1444 1445 /* 1446 * Bmap root header, on-disk form only. 1447 */ 1448 typedef struct xfs_bmdr_block { 1449 __be16 bb_level; /* 0 is a leaf */ 1450 __be16 bb_numrecs; /* current # of data records */ 1451 } xfs_bmdr_block_t; 1452 1453 /* 1454 * Bmap btree record and extent descriptor. 1455 * l0:63 is an extent flag (value 1 indicates non-normal). 1456 * l0:9-62 are startoff. 1457 * l0:0-8 and l1:21-63 are startblock. 1458 * l1:0-20 are blockcount. 1459 */ 1460 #define BMBT_EXNTFLAG_BITLEN 1 1461 #define BMBT_STARTOFF_BITLEN 54 1462 #define BMBT_STARTBLOCK_BITLEN 52 1463 #define BMBT_BLOCKCOUNT_BITLEN 21 1464 1465 typedef struct xfs_bmbt_rec { 1466 __be64 l0, l1; 1467 } xfs_bmbt_rec_t; 1468 1469 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1470 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1471 1472 typedef struct xfs_bmbt_rec_host { 1473 __uint64_t l0, l1; 1474 } xfs_bmbt_rec_host_t; 1475 1476 /* 1477 * Values and macros for delayed-allocation startblock fields. 1478 */ 1479 #define STARTBLOCKVALBITS 17 1480 #define STARTBLOCKMASKBITS (15 + 20) 1481 #define STARTBLOCKMASK \ 1482 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1483 1484 static inline int isnullstartblock(xfs_fsblock_t x) 1485 { 1486 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1487 } 1488 1489 static inline xfs_fsblock_t nullstartblock(int k) 1490 { 1491 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1492 return STARTBLOCKMASK | (k); 1493 } 1494 1495 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1496 { 1497 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1498 } 1499 1500 /* 1501 * Possible extent formats. 1502 */ 1503 typedef enum { 1504 XFS_EXTFMT_NOSTATE = 0, 1505 XFS_EXTFMT_HASSTATE 1506 } xfs_exntfmt_t; 1507 1508 /* 1509 * Possible extent states. 1510 */ 1511 typedef enum { 1512 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1513 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1514 } xfs_exntst_t; 1515 1516 /* 1517 * Incore version of above. 1518 */ 1519 typedef struct xfs_bmbt_irec 1520 { 1521 xfs_fileoff_t br_startoff; /* starting file offset */ 1522 xfs_fsblock_t br_startblock; /* starting block number */ 1523 xfs_filblks_t br_blockcount; /* number of blocks */ 1524 xfs_exntst_t br_state; /* extent state */ 1525 } xfs_bmbt_irec_t; 1526 1527 /* 1528 * Key structure for non-leaf levels of the tree. 1529 */ 1530 typedef struct xfs_bmbt_key { 1531 __be64 br_startoff; /* starting file offset */ 1532 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1533 1534 /* btree pointer type */ 1535 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1536 1537 1538 /* 1539 * Generic Btree block format definitions 1540 * 1541 * This is a combination of the actual format used on disk for short and long 1542 * format btrees. The first three fields are shared by both format, but the 1543 * pointers are different and should be used with care. 1544 * 1545 * To get the size of the actual short or long form headers please use the size 1546 * macros below. Never use sizeof(xfs_btree_block). 1547 * 1548 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1549 * with the crc feature bit, and all accesses to them must be conditional on 1550 * that flag. 1551 */ 1552 /* short form block header */ 1553 struct xfs_btree_block_shdr { 1554 __be32 bb_leftsib; 1555 __be32 bb_rightsib; 1556 1557 __be64 bb_blkno; 1558 __be64 bb_lsn; 1559 uuid_t bb_uuid; 1560 __be32 bb_owner; 1561 __le32 bb_crc; 1562 }; 1563 1564 /* long form block header */ 1565 struct xfs_btree_block_lhdr { 1566 __be64 bb_leftsib; 1567 __be64 bb_rightsib; 1568 1569 __be64 bb_blkno; 1570 __be64 bb_lsn; 1571 uuid_t bb_uuid; 1572 __be64 bb_owner; 1573 __le32 bb_crc; 1574 __be32 bb_pad; /* padding for alignment */ 1575 }; 1576 1577 struct xfs_btree_block { 1578 __be32 bb_magic; /* magic number for block type */ 1579 __be16 bb_level; /* 0 is a leaf */ 1580 __be16 bb_numrecs; /* current # of data records */ 1581 union { 1582 struct xfs_btree_block_shdr s; 1583 struct xfs_btree_block_lhdr l; 1584 } bb_u; /* rest */ 1585 }; 1586 1587 /* size of a short form block */ 1588 #define XFS_BTREE_SBLOCK_LEN \ 1589 (offsetof(struct xfs_btree_block, bb_u) + \ 1590 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1591 /* size of a long form block */ 1592 #define XFS_BTREE_LBLOCK_LEN \ 1593 (offsetof(struct xfs_btree_block, bb_u) + \ 1594 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1595 1596 /* sizes of CRC enabled btree blocks */ 1597 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1598 (offsetof(struct xfs_btree_block, bb_u) + \ 1599 sizeof(struct xfs_btree_block_shdr)) 1600 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1601 (offsetof(struct xfs_btree_block, bb_u) + \ 1602 sizeof(struct xfs_btree_block_lhdr)) 1603 1604 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1605 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1606 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1607 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1608 1609 /* 1610 * On-disk XFS access control list structure. 1611 */ 1612 struct xfs_acl_entry { 1613 __be32 ae_tag; 1614 __be32 ae_id; 1615 __be16 ae_perm; 1616 __be16 ae_pad; /* fill the implicit hole in the structure */ 1617 }; 1618 1619 struct xfs_acl { 1620 __be32 acl_cnt; 1621 struct xfs_acl_entry acl_entry[0]; 1622 }; 1623 1624 /* 1625 * The number of ACL entries allowed is defined by the on-disk format. 1626 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1627 * limited only by the maximum size of the xattr that stores the information. 1628 */ 1629 #define XFS_ACL_MAX_ENTRIES(mp) \ 1630 (xfs_sb_version_hascrc(&mp->m_sb) \ 1631 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1632 sizeof(struct xfs_acl_entry) \ 1633 : 25) 1634 1635 #define XFS_ACL_SIZE(cnt) \ 1636 (sizeof(struct xfs_acl) + \ 1637 sizeof(struct xfs_acl_entry) * cnt) 1638 1639 #define XFS_ACL_MAX_SIZE(mp) \ 1640 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1641 1642 1643 /* On-disk XFS extended attribute names */ 1644 #define SGI_ACL_FILE "SGI_ACL_FILE" 1645 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1646 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1647 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1648 1649 #endif /* __XFS_FORMAT_H__ */ 1650