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 /* 644 * reserve some contiguous space for future logged fields before we add 645 * the unlogged fields. This makes the range logging via flags and 646 * structure offsets much simpler. 647 */ 648 __be64 agf_spare64[16]; 649 650 /* unlogged fields, written during buffer writeback. */ 651 __be64 agf_lsn; /* last write sequence */ 652 __be32 agf_crc; /* crc of agf sector */ 653 __be32 agf_spare2; 654 655 /* structure must be padded to 64 bit alignment */ 656 } xfs_agf_t; 657 658 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 659 660 #define XFS_AGF_MAGICNUM 0x00000001 661 #define XFS_AGF_VERSIONNUM 0x00000002 662 #define XFS_AGF_SEQNO 0x00000004 663 #define XFS_AGF_LENGTH 0x00000008 664 #define XFS_AGF_ROOTS 0x00000010 665 #define XFS_AGF_LEVELS 0x00000020 666 #define XFS_AGF_FLFIRST 0x00000040 667 #define XFS_AGF_FLLAST 0x00000080 668 #define XFS_AGF_FLCOUNT 0x00000100 669 #define XFS_AGF_FREEBLKS 0x00000200 670 #define XFS_AGF_LONGEST 0x00000400 671 #define XFS_AGF_BTREEBLKS 0x00000800 672 #define XFS_AGF_UUID 0x00001000 673 #define XFS_AGF_NUM_BITS 13 674 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 675 676 #define XFS_AGF_FLAGS \ 677 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 678 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 679 { XFS_AGF_SEQNO, "SEQNO" }, \ 680 { XFS_AGF_LENGTH, "LENGTH" }, \ 681 { XFS_AGF_ROOTS, "ROOTS" }, \ 682 { XFS_AGF_LEVELS, "LEVELS" }, \ 683 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 684 { XFS_AGF_FLLAST, "FLLAST" }, \ 685 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 686 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 687 { XFS_AGF_LONGEST, "LONGEST" }, \ 688 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 689 { XFS_AGF_UUID, "UUID" } 690 691 /* disk block (xfs_daddr_t) in the AG */ 692 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 693 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 694 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 695 696 /* 697 * Size of the unlinked inode hash table in the agi. 698 */ 699 #define XFS_AGI_UNLINKED_BUCKETS 64 700 701 typedef struct xfs_agi { 702 /* 703 * Common allocation group header information 704 */ 705 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 706 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 707 __be32 agi_seqno; /* sequence # starting from 0 */ 708 __be32 agi_length; /* size in blocks of a.g. */ 709 /* 710 * Inode information 711 * Inodes are mapped by interpreting the inode number, so no 712 * mapping data is needed here. 713 */ 714 __be32 agi_count; /* count of allocated inodes */ 715 __be32 agi_root; /* root of inode btree */ 716 __be32 agi_level; /* levels in inode btree */ 717 __be32 agi_freecount; /* number of free inodes */ 718 719 __be32 agi_newino; /* new inode just allocated */ 720 __be32 agi_dirino; /* last directory inode chunk */ 721 /* 722 * Hash table of inodes which have been unlinked but are 723 * still being referenced. 724 */ 725 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 726 /* 727 * This marks the end of logging region 1 and start of logging region 2. 728 */ 729 uuid_t agi_uuid; /* uuid of filesystem */ 730 __be32 agi_crc; /* crc of agi sector */ 731 __be32 agi_pad32; 732 __be64 agi_lsn; /* last write sequence */ 733 734 __be32 agi_free_root; /* root of the free inode btree */ 735 __be32 agi_free_level;/* levels in free inode btree */ 736 737 /* structure must be padded to 64 bit alignment */ 738 } xfs_agi_t; 739 740 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 741 742 #define XFS_AGI_MAGICNUM (1 << 0) 743 #define XFS_AGI_VERSIONNUM (1 << 1) 744 #define XFS_AGI_SEQNO (1 << 2) 745 #define XFS_AGI_LENGTH (1 << 3) 746 #define XFS_AGI_COUNT (1 << 4) 747 #define XFS_AGI_ROOT (1 << 5) 748 #define XFS_AGI_LEVEL (1 << 6) 749 #define XFS_AGI_FREECOUNT (1 << 7) 750 #define XFS_AGI_NEWINO (1 << 8) 751 #define XFS_AGI_DIRINO (1 << 9) 752 #define XFS_AGI_UNLINKED (1 << 10) 753 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 754 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 755 #define XFS_AGI_FREE_ROOT (1 << 11) 756 #define XFS_AGI_FREE_LEVEL (1 << 12) 757 #define XFS_AGI_NUM_BITS_R2 13 758 759 /* disk block (xfs_daddr_t) in the AG */ 760 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 761 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 762 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 763 764 /* 765 * The third a.g. block contains the a.g. freelist, an array 766 * of block pointers to blocks owned by the allocation btree code. 767 */ 768 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 769 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 770 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 771 772 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 773 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 774 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 775 (__be32 *)(bp)->b_addr) 776 777 /* 778 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 779 * slots in the beginning of the block for a proper header with the 780 * location information and CRC. 781 */ 782 #define XFS_AGFL_SIZE(mp) \ 783 (((mp)->m_sb.sb_sectsize - \ 784 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 785 sizeof(struct xfs_agfl) : 0)) / \ 786 sizeof(xfs_agblock_t)) 787 788 typedef struct xfs_agfl { 789 __be32 agfl_magicnum; 790 __be32 agfl_seqno; 791 uuid_t agfl_uuid; 792 __be64 agfl_lsn; 793 __be32 agfl_crc; 794 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 795 } __attribute__((packed)) xfs_agfl_t; 796 797 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 798 799 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 800 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 801 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 802 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 803 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 804 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 805 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 806 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 807 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 808 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 809 810 /* 811 * For checking for bad ranges of xfs_daddr_t's, covering multiple 812 * allocation groups or a single xfs_daddr_t that's a superblock copy. 813 */ 814 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 815 ((len) == 1 ? \ 816 ASSERT((d) == XFS_SB_DADDR || \ 817 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 818 ASSERT(xfs_daddr_to_agno(mp, d) == \ 819 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 820 821 typedef struct xfs_timestamp { 822 __be32 t_sec; /* timestamp seconds */ 823 __be32 t_nsec; /* timestamp nanoseconds */ 824 } xfs_timestamp_t; 825 826 /* 827 * On-disk inode structure. 828 * 829 * This is just the header or "dinode core", the inode is expanded to fill a 830 * variable size the leftover area split into a data and an attribute fork. 831 * The format of the data and attribute fork depends on the format of the 832 * inode as indicated by di_format and di_aformat. To access the data and 833 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 834 * below. 835 * 836 * There is a very similar struct icdinode in xfs_inode which matches the 837 * layout of the first 96 bytes of this structure, but is kept in native 838 * format instead of big endian. 839 * 840 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 841 * padding field for v3 inodes. 842 */ 843 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 844 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 845 typedef struct xfs_dinode { 846 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 847 __be16 di_mode; /* mode and type of file */ 848 __u8 di_version; /* inode version */ 849 __u8 di_format; /* format of di_c data */ 850 __be16 di_onlink; /* old number of links to file */ 851 __be32 di_uid; /* owner's user id */ 852 __be32 di_gid; /* owner's group id */ 853 __be32 di_nlink; /* number of links to file */ 854 __be16 di_projid_lo; /* lower part of owner's project id */ 855 __be16 di_projid_hi; /* higher part owner's project id */ 856 __u8 di_pad[6]; /* unused, zeroed space */ 857 __be16 di_flushiter; /* incremented on flush */ 858 xfs_timestamp_t di_atime; /* time last accessed */ 859 xfs_timestamp_t di_mtime; /* time last modified */ 860 xfs_timestamp_t di_ctime; /* time created/inode modified */ 861 __be64 di_size; /* number of bytes in file */ 862 __be64 di_nblocks; /* # of direct & btree blocks used */ 863 __be32 di_extsize; /* basic/minimum extent size for file */ 864 __be32 di_nextents; /* number of extents in data fork */ 865 __be16 di_anextents; /* number of extents in attribute fork*/ 866 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 867 __s8 di_aformat; /* format of attr fork's data */ 868 __be32 di_dmevmask; /* DMIG event mask */ 869 __be16 di_dmstate; /* DMIG state info */ 870 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 871 __be32 di_gen; /* generation number */ 872 873 /* di_next_unlinked is the only non-core field in the old dinode */ 874 __be32 di_next_unlinked;/* agi unlinked list ptr */ 875 876 /* start of the extended dinode, writable fields */ 877 __le32 di_crc; /* CRC of the inode */ 878 __be64 di_changecount; /* number of attribute changes */ 879 __be64 di_lsn; /* flush sequence */ 880 __be64 di_flags2; /* more random flags */ 881 __u8 di_pad2[16]; /* more padding for future expansion */ 882 883 /* fields only written to during inode creation */ 884 xfs_timestamp_t di_crtime; /* time created */ 885 __be64 di_ino; /* inode number */ 886 uuid_t di_uuid; /* UUID of the filesystem */ 887 888 /* structure must be padded to 64 bit alignment */ 889 } xfs_dinode_t; 890 891 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 892 893 #define DI_MAX_FLUSH 0xffff 894 895 /* 896 * Size of the core inode on disk. Version 1 and 2 inodes have 897 * the same size, but version 3 has grown a few additional fields. 898 */ 899 static inline uint xfs_dinode_size(int version) 900 { 901 if (version == 3) 902 return sizeof(struct xfs_dinode); 903 return offsetof(struct xfs_dinode, di_crc); 904 } 905 906 /* 907 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 908 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 909 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 910 */ 911 #define XFS_MAXLINK ((1U << 31) - 1U) 912 #define XFS_MAXLINK_1 65535U 913 914 /* 915 * Values for di_format 916 */ 917 typedef enum xfs_dinode_fmt { 918 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 919 XFS_DINODE_FMT_LOCAL, /* bulk data */ 920 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 921 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 922 XFS_DINODE_FMT_UUID /* uuid_t */ 923 } xfs_dinode_fmt_t; 924 925 /* 926 * Inode minimum and maximum sizes. 927 */ 928 #define XFS_DINODE_MIN_LOG 8 929 #define XFS_DINODE_MAX_LOG 11 930 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 931 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 932 933 /* 934 * Inode size for given fs. 935 */ 936 #define XFS_LITINO(mp, version) \ 937 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 938 939 /* 940 * Inode data & attribute fork sizes, per inode. 941 */ 942 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 943 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 944 945 #define XFS_DFORK_DSIZE(dip,mp) \ 946 (XFS_DFORK_Q(dip) ? \ 947 XFS_DFORK_BOFF(dip) : \ 948 XFS_LITINO(mp, (dip)->di_version)) 949 #define XFS_DFORK_ASIZE(dip,mp) \ 950 (XFS_DFORK_Q(dip) ? \ 951 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 952 0) 953 #define XFS_DFORK_SIZE(dip,mp,w) \ 954 ((w) == XFS_DATA_FORK ? \ 955 XFS_DFORK_DSIZE(dip, mp) : \ 956 XFS_DFORK_ASIZE(dip, mp)) 957 958 /* 959 * Return pointers to the data or attribute forks. 960 */ 961 #define XFS_DFORK_DPTR(dip) \ 962 ((char *)dip + xfs_dinode_size(dip->di_version)) 963 #define XFS_DFORK_APTR(dip) \ 964 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 965 #define XFS_DFORK_PTR(dip,w) \ 966 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 967 968 #define XFS_DFORK_FORMAT(dip,w) \ 969 ((w) == XFS_DATA_FORK ? \ 970 (dip)->di_format : \ 971 (dip)->di_aformat) 972 #define XFS_DFORK_NEXTENTS(dip,w) \ 973 ((w) == XFS_DATA_FORK ? \ 974 be32_to_cpu((dip)->di_nextents) : \ 975 be16_to_cpu((dip)->di_anextents)) 976 977 /* 978 * For block and character special files the 32bit dev_t is stored at the 979 * beginning of the data fork. 980 */ 981 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 982 { 983 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 984 } 985 986 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 987 { 988 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 989 } 990 991 /* 992 * Values for di_flags 993 */ 994 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 995 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 996 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 997 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 998 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 999 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1000 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1001 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1002 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1003 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1004 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1005 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1006 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1007 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1008 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1009 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1010 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1011 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1012 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1013 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1014 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1015 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1016 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1017 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1018 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1019 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1020 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1021 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1022 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1023 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1024 1025 #define XFS_DIFLAG_ANY \ 1026 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1027 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1028 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1029 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1030 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1031 1032 /* 1033 * Values for di_flags2 These start by being exposed to userspace in the upper 1034 * 16 bits of the XFS_XFLAG_s range. 1035 */ 1036 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1037 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1038 1039 #define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) 1040 1041 /* 1042 * Inode number format: 1043 * low inopblog bits - offset in block 1044 * next agblklog bits - block number in ag 1045 * next agno_log bits - ag number 1046 * high agno_log-agblklog-inopblog bits - 0 1047 */ 1048 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1049 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1050 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1051 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1052 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1053 #define XFS_INO_BITS(mp) \ 1054 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1055 #define XFS_INO_TO_AGNO(mp,i) \ 1056 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1057 #define XFS_INO_TO_AGINO(mp,i) \ 1058 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1059 #define XFS_INO_TO_AGBNO(mp,i) \ 1060 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1061 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1062 #define XFS_INO_TO_OFFSET(mp,i) \ 1063 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1064 #define XFS_INO_TO_FSB(mp,i) \ 1065 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1066 #define XFS_AGINO_TO_INO(mp,a,i) \ 1067 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1068 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1069 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1070 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1071 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1072 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1073 1074 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1075 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1076 1077 /* 1078 * RealTime Device format definitions 1079 */ 1080 1081 /* Min and max rt extent sizes, specified in bytes */ 1082 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1083 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1084 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1085 1086 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1087 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1088 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1089 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1090 1091 /* 1092 * RT Summary and bit manipulation macros. 1093 */ 1094 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1095 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1096 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1097 #define XFS_SUMPTR(mp,bp,so) \ 1098 ((xfs_suminfo_t *)((bp)->b_addr + \ 1099 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1100 1101 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1102 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1103 #define XFS_BITTOWORD(mp,bi) \ 1104 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1105 1106 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1107 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1108 1109 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1110 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1111 1112 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1113 1114 /* 1115 * Dquot and dquot block format definitions 1116 */ 1117 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1118 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1119 1120 /* 1121 * This is the main portion of the on-disk representation of quota 1122 * information for a user. This is the q_core of the xfs_dquot_t that 1123 * is kept in kernel memory. We pad this with some more expansion room 1124 * to construct the on disk structure. 1125 */ 1126 typedef struct xfs_disk_dquot { 1127 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1128 __u8 d_version; /* dquot version */ 1129 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1130 __be32 d_id; /* user,project,group id */ 1131 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1132 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1133 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1134 __be64 d_ino_softlimit;/* preferred inode limit */ 1135 __be64 d_bcount; /* disk blocks owned by the user */ 1136 __be64 d_icount; /* inodes owned by the user */ 1137 __be32 d_itimer; /* zero if within inode limits if not, 1138 this is when we refuse service */ 1139 __be32 d_btimer; /* similar to above; for disk blocks */ 1140 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1141 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1142 __be32 d_pad0; /* 64 bit align */ 1143 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1144 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1145 __be64 d_rtbcount; /* realtime blocks owned */ 1146 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1147 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1148 __be16 d_pad; 1149 } xfs_disk_dquot_t; 1150 1151 /* 1152 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1153 * carrying the unnecessary padding would be a waste of memory. 1154 */ 1155 typedef struct xfs_dqblk { 1156 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1157 char dd_fill[4]; /* filling for posterity */ 1158 1159 /* 1160 * These two are only present on filesystems with the CRC bits set. 1161 */ 1162 __be32 dd_crc; /* checksum */ 1163 __be64 dd_lsn; /* last modification in log */ 1164 uuid_t dd_uuid; /* location information */ 1165 } xfs_dqblk_t; 1166 1167 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1168 1169 /* 1170 * Remote symlink format and access functions. 1171 */ 1172 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1173 1174 struct xfs_dsymlink_hdr { 1175 __be32 sl_magic; 1176 __be32 sl_offset; 1177 __be32 sl_bytes; 1178 __be32 sl_crc; 1179 uuid_t sl_uuid; 1180 __be64 sl_owner; 1181 __be64 sl_blkno; 1182 __be64 sl_lsn; 1183 }; 1184 1185 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1186 1187 /* 1188 * The maximum pathlen is 1024 bytes. Since the minimum file system 1189 * blocksize is 512 bytes, we can get a max of 3 extents back from 1190 * bmapi when crc headers are taken into account. 1191 */ 1192 #define XFS_SYMLINK_MAPS 3 1193 1194 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1195 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1196 sizeof(struct xfs_dsymlink_hdr) : 0)) 1197 1198 1199 /* 1200 * Allocation Btree format definitions 1201 * 1202 * There are two on-disk btrees, one sorted by blockno and one sorted 1203 * by blockcount and blockno. All blocks look the same to make the code 1204 * simpler; if we have time later, we'll make the optimizations. 1205 */ 1206 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1207 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1208 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1209 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1210 1211 /* 1212 * Data record/key structure 1213 */ 1214 typedef struct xfs_alloc_rec { 1215 __be32 ar_startblock; /* starting block number */ 1216 __be32 ar_blockcount; /* count of free blocks */ 1217 } xfs_alloc_rec_t, xfs_alloc_key_t; 1218 1219 typedef struct xfs_alloc_rec_incore { 1220 xfs_agblock_t ar_startblock; /* starting block number */ 1221 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1222 } xfs_alloc_rec_incore_t; 1223 1224 /* btree pointer type */ 1225 typedef __be32 xfs_alloc_ptr_t; 1226 1227 /* 1228 * Block numbers in the AG: 1229 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1230 */ 1231 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1232 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1233 1234 1235 /* 1236 * Inode Allocation Btree format definitions 1237 * 1238 * There is a btree for the inode map per allocation group. 1239 */ 1240 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1241 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1242 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1243 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1244 1245 typedef __uint64_t xfs_inofree_t; 1246 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1247 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1248 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1249 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1250 1251 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1252 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1253 #define XFS_INODES_PER_HOLEMASK_BIT \ 1254 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1255 1256 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1257 { 1258 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1259 } 1260 1261 /* 1262 * The on-disk inode record structure has two formats. The original "full" 1263 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1264 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1265 * count. 1266 * 1267 * The holemask of the sparse record format allows an inode chunk to have holes 1268 * that refer to blocks not owned by the inode record. This facilitates inode 1269 * allocation in the event of severe free space fragmentation. 1270 */ 1271 typedef struct xfs_inobt_rec { 1272 __be32 ir_startino; /* starting inode number */ 1273 union { 1274 struct { 1275 __be32 ir_freecount; /* count of free inodes */ 1276 } f; 1277 struct { 1278 __be16 ir_holemask;/* hole mask for sparse chunks */ 1279 __u8 ir_count; /* total inode count */ 1280 __u8 ir_freecount; /* count of free inodes */ 1281 } sp; 1282 } ir_u; 1283 __be64 ir_free; /* free inode mask */ 1284 } xfs_inobt_rec_t; 1285 1286 typedef struct xfs_inobt_rec_incore { 1287 xfs_agino_t ir_startino; /* starting inode number */ 1288 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1289 __uint8_t ir_count; /* total inode count */ 1290 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1291 xfs_inofree_t ir_free; /* free inode mask */ 1292 } xfs_inobt_rec_incore_t; 1293 1294 static inline bool xfs_inobt_issparse(uint16_t holemask) 1295 { 1296 /* non-zero holemask represents a sparse rec. */ 1297 return holemask; 1298 } 1299 1300 /* 1301 * Key structure 1302 */ 1303 typedef struct xfs_inobt_key { 1304 __be32 ir_startino; /* starting inode number */ 1305 } xfs_inobt_key_t; 1306 1307 /* btree pointer type */ 1308 typedef __be32 xfs_inobt_ptr_t; 1309 1310 /* 1311 * block numbers in the AG. 1312 */ 1313 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1314 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1315 1316 /* 1317 * Reverse mapping btree format definitions 1318 * 1319 * There is a btree for the reverse map per allocation group 1320 */ 1321 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1322 1323 /* 1324 * Ownership info for an extent. This is used to create reverse-mapping 1325 * entries. 1326 */ 1327 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1328 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1329 struct xfs_owner_info { 1330 uint64_t oi_owner; 1331 xfs_fileoff_t oi_offset; 1332 unsigned int oi_flags; 1333 }; 1334 1335 /* 1336 * Special owner types. 1337 * 1338 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1339 * to tell us we have a special owner value. We use these for static metadata 1340 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1341 */ 1342 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1343 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1344 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1345 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1346 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1347 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1348 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1349 #define XFS_RMAP_OWN_MIN (-8ULL) /* guard */ 1350 1351 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1352 1353 /* 1354 * Data record structure 1355 */ 1356 struct xfs_rmap_rec { 1357 __be32 rm_startblock; /* extent start block */ 1358 __be32 rm_blockcount; /* extent length */ 1359 __be64 rm_owner; /* extent owner */ 1360 __be64 rm_offset; /* offset within the owner */ 1361 }; 1362 1363 /* 1364 * rmap btree record 1365 * rm_offset:63 is the attribute fork flag 1366 * rm_offset:62 is the bmbt block flag 1367 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1368 * rm_offset:54-60 aren't used and should be zero 1369 * rm_offset:0-53 is the block offset within the inode 1370 */ 1371 #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) 1372 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) 1373 #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) 1374 1375 #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) 1376 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1377 XFS_RMAP_OFF_BMBT_BLOCK | \ 1378 XFS_RMAP_OFF_UNWRITTEN) 1379 #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) 1380 1381 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1382 1383 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1384 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1385 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1386 1387 #define RMAPBT_STARTBLOCK_BITLEN 32 1388 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1389 #define RMAPBT_OWNER_BITLEN 64 1390 #define RMAPBT_ATTRFLAG_BITLEN 1 1391 #define RMAPBT_BMBTFLAG_BITLEN 1 1392 #define RMAPBT_EXNTFLAG_BITLEN 1 1393 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1394 #define RMAPBT_OFFSET_BITLEN 54 1395 1396 #define XFS_RMAP_ATTR_FORK (1 << 0) 1397 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1398 #define XFS_RMAP_UNWRITTEN (1 << 2) 1399 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1400 XFS_RMAP_BMBT_BLOCK) 1401 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1402 struct xfs_rmap_irec { 1403 xfs_agblock_t rm_startblock; /* extent start block */ 1404 xfs_extlen_t rm_blockcount; /* extent length */ 1405 __uint64_t rm_owner; /* extent owner */ 1406 __uint64_t rm_offset; /* offset within the owner */ 1407 unsigned int rm_flags; /* state flags */ 1408 }; 1409 1410 /* 1411 * Key structure 1412 * 1413 * We don't use the length for lookups 1414 */ 1415 struct xfs_rmap_key { 1416 __be32 rm_startblock; /* extent start block */ 1417 __be64 rm_owner; /* extent owner */ 1418 __be64 rm_offset; /* offset within the owner */ 1419 } __attribute__((packed)); 1420 1421 /* btree pointer type */ 1422 typedef __be32 xfs_rmap_ptr_t; 1423 1424 #define XFS_RMAP_BLOCK(mp) \ 1425 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1426 XFS_FIBT_BLOCK(mp) + 1 : \ 1427 XFS_IBT_BLOCK(mp) + 1) 1428 1429 /* 1430 * BMAP Btree format definitions 1431 * 1432 * This includes both the root block definition that sits inside an inode fork 1433 * and the record/pointer formats for the leaf/node in the blocks. 1434 */ 1435 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1436 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1437 1438 /* 1439 * Bmap root header, on-disk form only. 1440 */ 1441 typedef struct xfs_bmdr_block { 1442 __be16 bb_level; /* 0 is a leaf */ 1443 __be16 bb_numrecs; /* current # of data records */ 1444 } xfs_bmdr_block_t; 1445 1446 /* 1447 * Bmap btree record and extent descriptor. 1448 * l0:63 is an extent flag (value 1 indicates non-normal). 1449 * l0:9-62 are startoff. 1450 * l0:0-8 and l1:21-63 are startblock. 1451 * l1:0-20 are blockcount. 1452 */ 1453 #define BMBT_EXNTFLAG_BITLEN 1 1454 #define BMBT_STARTOFF_BITLEN 54 1455 #define BMBT_STARTBLOCK_BITLEN 52 1456 #define BMBT_BLOCKCOUNT_BITLEN 21 1457 1458 typedef struct xfs_bmbt_rec { 1459 __be64 l0, l1; 1460 } xfs_bmbt_rec_t; 1461 1462 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1463 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1464 1465 typedef struct xfs_bmbt_rec_host { 1466 __uint64_t l0, l1; 1467 } xfs_bmbt_rec_host_t; 1468 1469 /* 1470 * Values and macros for delayed-allocation startblock fields. 1471 */ 1472 #define STARTBLOCKVALBITS 17 1473 #define STARTBLOCKMASKBITS (15 + 20) 1474 #define STARTBLOCKMASK \ 1475 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1476 1477 static inline int isnullstartblock(xfs_fsblock_t x) 1478 { 1479 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1480 } 1481 1482 static inline xfs_fsblock_t nullstartblock(int k) 1483 { 1484 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1485 return STARTBLOCKMASK | (k); 1486 } 1487 1488 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1489 { 1490 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1491 } 1492 1493 /* 1494 * Possible extent formats. 1495 */ 1496 typedef enum { 1497 XFS_EXTFMT_NOSTATE = 0, 1498 XFS_EXTFMT_HASSTATE 1499 } xfs_exntfmt_t; 1500 1501 /* 1502 * Possible extent states. 1503 */ 1504 typedef enum { 1505 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1506 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1507 } xfs_exntst_t; 1508 1509 /* 1510 * Incore version of above. 1511 */ 1512 typedef struct xfs_bmbt_irec 1513 { 1514 xfs_fileoff_t br_startoff; /* starting file offset */ 1515 xfs_fsblock_t br_startblock; /* starting block number */ 1516 xfs_filblks_t br_blockcount; /* number of blocks */ 1517 xfs_exntst_t br_state; /* extent state */ 1518 } xfs_bmbt_irec_t; 1519 1520 /* 1521 * Key structure for non-leaf levels of the tree. 1522 */ 1523 typedef struct xfs_bmbt_key { 1524 __be64 br_startoff; /* starting file offset */ 1525 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1526 1527 /* btree pointer type */ 1528 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1529 1530 1531 /* 1532 * Generic Btree block format definitions 1533 * 1534 * This is a combination of the actual format used on disk for short and long 1535 * format btrees. The first three fields are shared by both format, but the 1536 * pointers are different and should be used with care. 1537 * 1538 * To get the size of the actual short or long form headers please use the size 1539 * macros below. Never use sizeof(xfs_btree_block). 1540 * 1541 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1542 * with the crc feature bit, and all accesses to them must be conditional on 1543 * that flag. 1544 */ 1545 /* short form block header */ 1546 struct xfs_btree_block_shdr { 1547 __be32 bb_leftsib; 1548 __be32 bb_rightsib; 1549 1550 __be64 bb_blkno; 1551 __be64 bb_lsn; 1552 uuid_t bb_uuid; 1553 __be32 bb_owner; 1554 __le32 bb_crc; 1555 }; 1556 1557 /* long form block header */ 1558 struct xfs_btree_block_lhdr { 1559 __be64 bb_leftsib; 1560 __be64 bb_rightsib; 1561 1562 __be64 bb_blkno; 1563 __be64 bb_lsn; 1564 uuid_t bb_uuid; 1565 __be64 bb_owner; 1566 __le32 bb_crc; 1567 __be32 bb_pad; /* padding for alignment */ 1568 }; 1569 1570 struct xfs_btree_block { 1571 __be32 bb_magic; /* magic number for block type */ 1572 __be16 bb_level; /* 0 is a leaf */ 1573 __be16 bb_numrecs; /* current # of data records */ 1574 union { 1575 struct xfs_btree_block_shdr s; 1576 struct xfs_btree_block_lhdr l; 1577 } bb_u; /* rest */ 1578 }; 1579 1580 /* size of a short form block */ 1581 #define XFS_BTREE_SBLOCK_LEN \ 1582 (offsetof(struct xfs_btree_block, bb_u) + \ 1583 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1584 /* size of a long form block */ 1585 #define XFS_BTREE_LBLOCK_LEN \ 1586 (offsetof(struct xfs_btree_block, bb_u) + \ 1587 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1588 1589 /* sizes of CRC enabled btree blocks */ 1590 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1591 (offsetof(struct xfs_btree_block, bb_u) + \ 1592 sizeof(struct xfs_btree_block_shdr)) 1593 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1594 (offsetof(struct xfs_btree_block, bb_u) + \ 1595 sizeof(struct xfs_btree_block_lhdr)) 1596 1597 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1598 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1599 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1600 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1601 1602 /* 1603 * On-disk XFS access control list structure. 1604 */ 1605 struct xfs_acl_entry { 1606 __be32 ae_tag; 1607 __be32 ae_id; 1608 __be16 ae_perm; 1609 __be16 ae_pad; /* fill the implicit hole in the structure */ 1610 }; 1611 1612 struct xfs_acl { 1613 __be32 acl_cnt; 1614 struct xfs_acl_entry acl_entry[0]; 1615 }; 1616 1617 /* 1618 * The number of ACL entries allowed is defined by the on-disk format. 1619 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1620 * limited only by the maximum size of the xattr that stores the information. 1621 */ 1622 #define XFS_ACL_MAX_ENTRIES(mp) \ 1623 (xfs_sb_version_hascrc(&mp->m_sb) \ 1624 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1625 sizeof(struct xfs_acl_entry) \ 1626 : 25) 1627 1628 #define XFS_ACL_SIZE(cnt) \ 1629 (sizeof(struct xfs_acl) + \ 1630 sizeof(struct xfs_acl_entry) * cnt) 1631 1632 #define XFS_ACL_MAX_SIZE(mp) \ 1633 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1634 1635 1636 /* On-disk XFS extended attribute names */ 1637 #define SGI_ACL_FILE "SGI_ACL_FILE" 1638 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1639 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1640 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1641 1642 #endif /* __XFS_FORMAT_H__ */ 1643