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_REFLINK (1 << 2) /* reflinked files */ 460 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 461 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ 462 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ 463 XFS_SB_FEAT_RO_COMPAT_REFLINK) 464 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 465 static inline bool 466 xfs_sb_has_ro_compat_feature( 467 struct xfs_sb *sbp, 468 __uint32_t feature) 469 { 470 return (sbp->sb_features_ro_compat & feature) != 0; 471 } 472 473 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 474 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 475 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 476 #define XFS_SB_FEAT_INCOMPAT_ALL \ 477 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 478 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 479 XFS_SB_FEAT_INCOMPAT_META_UUID) 480 481 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 482 static inline bool 483 xfs_sb_has_incompat_feature( 484 struct xfs_sb *sbp, 485 __uint32_t feature) 486 { 487 return (sbp->sb_features_incompat & feature) != 0; 488 } 489 490 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 491 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 492 static inline bool 493 xfs_sb_has_incompat_log_feature( 494 struct xfs_sb *sbp, 495 __uint32_t feature) 496 { 497 return (sbp->sb_features_log_incompat & feature) != 0; 498 } 499 500 /* 501 * V5 superblock specific feature checks 502 */ 503 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 504 { 505 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 506 } 507 508 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 509 { 510 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 511 } 512 513 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 514 { 515 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 516 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 517 (xfs_sb_version_hasmorebits(sbp) && 518 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 519 } 520 521 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 522 { 523 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 524 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 525 } 526 527 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 528 { 529 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 530 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 531 } 532 533 /* 534 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 535 * is stored separately from the user-visible UUID; this allows the 536 * user-visible UUID to be changed on V5 filesystems which have a 537 * filesystem UUID stamped into every piece of metadata. 538 */ 539 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 540 { 541 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 542 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 543 } 544 545 static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp) 546 { 547 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 548 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT); 549 } 550 551 static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) 552 { 553 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 554 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); 555 } 556 557 /* 558 * end of superblock version macros 559 */ 560 561 static inline bool 562 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 563 { 564 return (ino == sbp->sb_uquotino || 565 ino == sbp->sb_gquotino || 566 ino == sbp->sb_pquotino); 567 } 568 569 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 570 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 571 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 572 573 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 574 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 575 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 576 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 577 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 578 579 /* 580 * File system sector to basic block conversions. 581 */ 582 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 583 584 /* 585 * File system block to basic block conversions. 586 */ 587 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 588 #define XFS_BB_TO_FSB(mp,bb) \ 589 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 590 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 591 592 /* 593 * File system block to byte conversions. 594 */ 595 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 596 #define XFS_B_TO_FSB(mp,b) \ 597 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 598 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 599 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 600 601 /* 602 * Allocation group header 603 * 604 * This is divided into three structures, placed in sequential 512-byte 605 * buffers after a copy of the superblock (also in a 512-byte buffer). 606 */ 607 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 608 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 609 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 610 #define XFS_AGF_VERSION 1 611 #define XFS_AGI_VERSION 1 612 613 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 614 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 615 616 /* 617 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the 618 * arrays below. 619 */ 620 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1) 621 622 /* 623 * The second word of agf_levels in the first a.g. overlaps the EFS 624 * superblock's magic number. Since the magic numbers valid for EFS 625 * are > 64k, our value cannot be confused for an EFS superblock's. 626 */ 627 628 typedef struct xfs_agf { 629 /* 630 * Common allocation group header information 631 */ 632 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 633 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 634 __be32 agf_seqno; /* sequence # starting from 0 */ 635 __be32 agf_length; /* size in blocks of a.g. */ 636 /* 637 * Freespace and rmap information 638 */ 639 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 640 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 641 642 __be32 agf_flfirst; /* first freelist block's index */ 643 __be32 agf_fllast; /* last freelist block's index */ 644 __be32 agf_flcount; /* count of blocks in freelist */ 645 __be32 agf_freeblks; /* total free blocks */ 646 647 __be32 agf_longest; /* longest free space */ 648 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 649 uuid_t agf_uuid; /* uuid of filesystem */ 650 651 __be32 agf_rmap_blocks; /* rmapbt blocks used */ 652 __be32 agf_refcount_blocks; /* refcountbt blocks used */ 653 654 __be32 agf_refcount_root; /* refcount tree root block */ 655 __be32 agf_refcount_level; /* refcount btree levels */ 656 657 /* 658 * reserve some contiguous space for future logged fields before we add 659 * the unlogged fields. This makes the range logging via flags and 660 * structure offsets much simpler. 661 */ 662 __be64 agf_spare64[14]; 663 664 /* unlogged fields, written during buffer writeback. */ 665 __be64 agf_lsn; /* last write sequence */ 666 __be32 agf_crc; /* crc of agf sector */ 667 __be32 agf_spare2; 668 669 /* structure must be padded to 64 bit alignment */ 670 } xfs_agf_t; 671 672 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 673 674 #define XFS_AGF_MAGICNUM 0x00000001 675 #define XFS_AGF_VERSIONNUM 0x00000002 676 #define XFS_AGF_SEQNO 0x00000004 677 #define XFS_AGF_LENGTH 0x00000008 678 #define XFS_AGF_ROOTS 0x00000010 679 #define XFS_AGF_LEVELS 0x00000020 680 #define XFS_AGF_FLFIRST 0x00000040 681 #define XFS_AGF_FLLAST 0x00000080 682 #define XFS_AGF_FLCOUNT 0x00000100 683 #define XFS_AGF_FREEBLKS 0x00000200 684 #define XFS_AGF_LONGEST 0x00000400 685 #define XFS_AGF_BTREEBLKS 0x00000800 686 #define XFS_AGF_UUID 0x00001000 687 #define XFS_AGF_RMAP_BLOCKS 0x00002000 688 #define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 689 #define XFS_AGF_REFCOUNT_ROOT 0x00008000 690 #define XFS_AGF_REFCOUNT_LEVEL 0x00010000 691 #define XFS_AGF_SPARE64 0x00020000 692 #define XFS_AGF_NUM_BITS 18 693 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 694 695 #define XFS_AGF_FLAGS \ 696 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 697 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 698 { XFS_AGF_SEQNO, "SEQNO" }, \ 699 { XFS_AGF_LENGTH, "LENGTH" }, \ 700 { XFS_AGF_ROOTS, "ROOTS" }, \ 701 { XFS_AGF_LEVELS, "LEVELS" }, \ 702 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 703 { XFS_AGF_FLLAST, "FLLAST" }, \ 704 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 705 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 706 { XFS_AGF_LONGEST, "LONGEST" }, \ 707 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 708 { XFS_AGF_UUID, "UUID" }, \ 709 { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ 710 { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ 711 { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ 712 { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ 713 { XFS_AGF_SPARE64, "SPARE64" } 714 715 /* disk block (xfs_daddr_t) in the AG */ 716 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 717 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 718 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 719 720 /* 721 * Size of the unlinked inode hash table in the agi. 722 */ 723 #define XFS_AGI_UNLINKED_BUCKETS 64 724 725 typedef struct xfs_agi { 726 /* 727 * Common allocation group header information 728 */ 729 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 730 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 731 __be32 agi_seqno; /* sequence # starting from 0 */ 732 __be32 agi_length; /* size in blocks of a.g. */ 733 /* 734 * Inode information 735 * Inodes are mapped by interpreting the inode number, so no 736 * mapping data is needed here. 737 */ 738 __be32 agi_count; /* count of allocated inodes */ 739 __be32 agi_root; /* root of inode btree */ 740 __be32 agi_level; /* levels in inode btree */ 741 __be32 agi_freecount; /* number of free inodes */ 742 743 __be32 agi_newino; /* new inode just allocated */ 744 __be32 agi_dirino; /* last directory inode chunk */ 745 /* 746 * Hash table of inodes which have been unlinked but are 747 * still being referenced. 748 */ 749 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 750 /* 751 * This marks the end of logging region 1 and start of logging region 2. 752 */ 753 uuid_t agi_uuid; /* uuid of filesystem */ 754 __be32 agi_crc; /* crc of agi sector */ 755 __be32 agi_pad32; 756 __be64 agi_lsn; /* last write sequence */ 757 758 __be32 agi_free_root; /* root of the free inode btree */ 759 __be32 agi_free_level;/* levels in free inode btree */ 760 761 /* structure must be padded to 64 bit alignment */ 762 } xfs_agi_t; 763 764 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 765 766 #define XFS_AGI_MAGICNUM (1 << 0) 767 #define XFS_AGI_VERSIONNUM (1 << 1) 768 #define XFS_AGI_SEQNO (1 << 2) 769 #define XFS_AGI_LENGTH (1 << 3) 770 #define XFS_AGI_COUNT (1 << 4) 771 #define XFS_AGI_ROOT (1 << 5) 772 #define XFS_AGI_LEVEL (1 << 6) 773 #define XFS_AGI_FREECOUNT (1 << 7) 774 #define XFS_AGI_NEWINO (1 << 8) 775 #define XFS_AGI_DIRINO (1 << 9) 776 #define XFS_AGI_UNLINKED (1 << 10) 777 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 778 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 779 #define XFS_AGI_FREE_ROOT (1 << 11) 780 #define XFS_AGI_FREE_LEVEL (1 << 12) 781 #define XFS_AGI_NUM_BITS_R2 13 782 783 /* disk block (xfs_daddr_t) in the AG */ 784 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 785 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 786 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 787 788 /* 789 * The third a.g. block contains the a.g. freelist, an array 790 * of block pointers to blocks owned by the allocation btree code. 791 */ 792 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 793 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 794 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 795 796 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 797 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 798 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 799 (__be32 *)(bp)->b_addr) 800 801 /* 802 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 803 * slots in the beginning of the block for a proper header with the 804 * location information and CRC. 805 */ 806 #define XFS_AGFL_SIZE(mp) \ 807 (((mp)->m_sb.sb_sectsize - \ 808 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 809 sizeof(struct xfs_agfl) : 0)) / \ 810 sizeof(xfs_agblock_t)) 811 812 typedef struct xfs_agfl { 813 __be32 agfl_magicnum; 814 __be32 agfl_seqno; 815 uuid_t agfl_uuid; 816 __be64 agfl_lsn; 817 __be32 agfl_crc; 818 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 819 } __attribute__((packed)) xfs_agfl_t; 820 821 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 822 823 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 824 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 825 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 826 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 827 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 828 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 829 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 830 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 831 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 832 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 833 834 /* 835 * For checking for bad ranges of xfs_daddr_t's, covering multiple 836 * allocation groups or a single xfs_daddr_t that's a superblock copy. 837 */ 838 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 839 ((len) == 1 ? \ 840 ASSERT((d) == XFS_SB_DADDR || \ 841 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 842 ASSERT(xfs_daddr_to_agno(mp, d) == \ 843 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 844 845 typedef struct xfs_timestamp { 846 __be32 t_sec; /* timestamp seconds */ 847 __be32 t_nsec; /* timestamp nanoseconds */ 848 } xfs_timestamp_t; 849 850 /* 851 * On-disk inode structure. 852 * 853 * This is just the header or "dinode core", the inode is expanded to fill a 854 * variable size the leftover area split into a data and an attribute fork. 855 * The format of the data and attribute fork depends on the format of the 856 * inode as indicated by di_format and di_aformat. To access the data and 857 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 858 * below. 859 * 860 * There is a very similar struct icdinode in xfs_inode which matches the 861 * layout of the first 96 bytes of this structure, but is kept in native 862 * format instead of big endian. 863 * 864 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 865 * padding field for v3 inodes. 866 */ 867 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 868 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 869 typedef struct xfs_dinode { 870 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 871 __be16 di_mode; /* mode and type of file */ 872 __u8 di_version; /* inode version */ 873 __u8 di_format; /* format of di_c data */ 874 __be16 di_onlink; /* old number of links to file */ 875 __be32 di_uid; /* owner's user id */ 876 __be32 di_gid; /* owner's group id */ 877 __be32 di_nlink; /* number of links to file */ 878 __be16 di_projid_lo; /* lower part of owner's project id */ 879 __be16 di_projid_hi; /* higher part owner's project id */ 880 __u8 di_pad[6]; /* unused, zeroed space */ 881 __be16 di_flushiter; /* incremented on flush */ 882 xfs_timestamp_t di_atime; /* time last accessed */ 883 xfs_timestamp_t di_mtime; /* time last modified */ 884 xfs_timestamp_t di_ctime; /* time created/inode modified */ 885 __be64 di_size; /* number of bytes in file */ 886 __be64 di_nblocks; /* # of direct & btree blocks used */ 887 __be32 di_extsize; /* basic/minimum extent size for file */ 888 __be32 di_nextents; /* number of extents in data fork */ 889 __be16 di_anextents; /* number of extents in attribute fork*/ 890 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 891 __s8 di_aformat; /* format of attr fork's data */ 892 __be32 di_dmevmask; /* DMIG event mask */ 893 __be16 di_dmstate; /* DMIG state info */ 894 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 895 __be32 di_gen; /* generation number */ 896 897 /* di_next_unlinked is the only non-core field in the old dinode */ 898 __be32 di_next_unlinked;/* agi unlinked list ptr */ 899 900 /* start of the extended dinode, writable fields */ 901 __le32 di_crc; /* CRC of the inode */ 902 __be64 di_changecount; /* number of attribute changes */ 903 __be64 di_lsn; /* flush sequence */ 904 __be64 di_flags2; /* more random flags */ 905 __be32 di_cowextsize; /* basic cow extent size for file */ 906 __u8 di_pad2[12]; /* more padding for future expansion */ 907 908 /* fields only written to during inode creation */ 909 xfs_timestamp_t di_crtime; /* time created */ 910 __be64 di_ino; /* inode number */ 911 uuid_t di_uuid; /* UUID of the filesystem */ 912 913 /* structure must be padded to 64 bit alignment */ 914 } xfs_dinode_t; 915 916 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 917 918 #define DI_MAX_FLUSH 0xffff 919 920 /* 921 * Size of the core inode on disk. Version 1 and 2 inodes have 922 * the same size, but version 3 has grown a few additional fields. 923 */ 924 static inline uint xfs_dinode_size(int version) 925 { 926 if (version == 3) 927 return sizeof(struct xfs_dinode); 928 return offsetof(struct xfs_dinode, di_crc); 929 } 930 931 /* 932 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 933 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 934 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 935 */ 936 #define XFS_MAXLINK ((1U << 31) - 1U) 937 #define XFS_MAXLINK_1 65535U 938 939 /* 940 * Values for di_format 941 */ 942 typedef enum xfs_dinode_fmt { 943 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 944 XFS_DINODE_FMT_LOCAL, /* bulk data */ 945 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 946 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 947 XFS_DINODE_FMT_UUID /* uuid_t */ 948 } xfs_dinode_fmt_t; 949 950 /* 951 * Inode minimum and maximum sizes. 952 */ 953 #define XFS_DINODE_MIN_LOG 8 954 #define XFS_DINODE_MAX_LOG 11 955 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 956 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 957 958 /* 959 * Inode size for given fs. 960 */ 961 #define XFS_LITINO(mp, version) \ 962 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 963 964 /* 965 * Inode data & attribute fork sizes, per inode. 966 */ 967 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 968 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 969 970 #define XFS_DFORK_DSIZE(dip,mp) \ 971 (XFS_DFORK_Q(dip) ? \ 972 XFS_DFORK_BOFF(dip) : \ 973 XFS_LITINO(mp, (dip)->di_version)) 974 #define XFS_DFORK_ASIZE(dip,mp) \ 975 (XFS_DFORK_Q(dip) ? \ 976 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 977 0) 978 #define XFS_DFORK_SIZE(dip,mp,w) \ 979 ((w) == XFS_DATA_FORK ? \ 980 XFS_DFORK_DSIZE(dip, mp) : \ 981 XFS_DFORK_ASIZE(dip, mp)) 982 983 /* 984 * Return pointers to the data or attribute forks. 985 */ 986 #define XFS_DFORK_DPTR(dip) \ 987 ((char *)dip + xfs_dinode_size(dip->di_version)) 988 #define XFS_DFORK_APTR(dip) \ 989 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 990 #define XFS_DFORK_PTR(dip,w) \ 991 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 992 993 #define XFS_DFORK_FORMAT(dip,w) \ 994 ((w) == XFS_DATA_FORK ? \ 995 (dip)->di_format : \ 996 (dip)->di_aformat) 997 #define XFS_DFORK_NEXTENTS(dip,w) \ 998 ((w) == XFS_DATA_FORK ? \ 999 be32_to_cpu((dip)->di_nextents) : \ 1000 be16_to_cpu((dip)->di_anextents)) 1001 1002 /* 1003 * For block and character special files the 32bit dev_t is stored at the 1004 * beginning of the data fork. 1005 */ 1006 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1007 { 1008 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1009 } 1010 1011 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1012 { 1013 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1014 } 1015 1016 /* 1017 * Values for di_flags 1018 */ 1019 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1020 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1021 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1022 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1023 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1024 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1025 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1026 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1027 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1028 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1029 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1030 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1031 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1032 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1033 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1034 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1035 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1036 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1037 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1038 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1039 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1040 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1041 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1042 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1043 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1044 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1045 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1046 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1047 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1048 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1049 1050 #define XFS_DIFLAG_ANY \ 1051 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1052 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1053 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1054 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1055 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1056 1057 /* 1058 * Values for di_flags2 These start by being exposed to userspace in the upper 1059 * 16 bits of the XFS_XFLAG_s range. 1060 */ 1061 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1062 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ 1063 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ 1064 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1065 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) 1066 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) 1067 1068 #define XFS_DIFLAG2_ANY \ 1069 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) 1070 1071 /* 1072 * Inode number format: 1073 * low inopblog bits - offset in block 1074 * next agblklog bits - block number in ag 1075 * next agno_log bits - ag number 1076 * high agno_log-agblklog-inopblog bits - 0 1077 */ 1078 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1079 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1080 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1081 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1082 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1083 #define XFS_INO_BITS(mp) \ 1084 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1085 #define XFS_INO_TO_AGNO(mp,i) \ 1086 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1087 #define XFS_INO_TO_AGINO(mp,i) \ 1088 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1089 #define XFS_INO_TO_AGBNO(mp,i) \ 1090 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1091 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1092 #define XFS_INO_TO_OFFSET(mp,i) \ 1093 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1094 #define XFS_INO_TO_FSB(mp,i) \ 1095 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1096 #define XFS_AGINO_TO_INO(mp,a,i) \ 1097 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1098 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1099 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1100 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1101 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1102 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1103 1104 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1105 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1106 1107 /* 1108 * RealTime Device format definitions 1109 */ 1110 1111 /* Min and max rt extent sizes, specified in bytes */ 1112 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1113 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1114 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1115 1116 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1117 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1118 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1119 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1120 1121 /* 1122 * RT Summary and bit manipulation macros. 1123 */ 1124 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1125 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1126 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1127 #define XFS_SUMPTR(mp,bp,so) \ 1128 ((xfs_suminfo_t *)((bp)->b_addr + \ 1129 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1130 1131 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1132 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1133 #define XFS_BITTOWORD(mp,bi) \ 1134 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1135 1136 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1137 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1138 1139 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1140 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1141 1142 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1143 1144 /* 1145 * Dquot and dquot block format definitions 1146 */ 1147 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1148 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1149 1150 /* 1151 * This is the main portion of the on-disk representation of quota 1152 * information for a user. This is the q_core of the xfs_dquot_t that 1153 * is kept in kernel memory. We pad this with some more expansion room 1154 * to construct the on disk structure. 1155 */ 1156 typedef struct xfs_disk_dquot { 1157 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1158 __u8 d_version; /* dquot version */ 1159 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1160 __be32 d_id; /* user,project,group id */ 1161 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1162 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1163 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1164 __be64 d_ino_softlimit;/* preferred inode limit */ 1165 __be64 d_bcount; /* disk blocks owned by the user */ 1166 __be64 d_icount; /* inodes owned by the user */ 1167 __be32 d_itimer; /* zero if within inode limits if not, 1168 this is when we refuse service */ 1169 __be32 d_btimer; /* similar to above; for disk blocks */ 1170 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1171 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1172 __be32 d_pad0; /* 64 bit align */ 1173 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1174 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1175 __be64 d_rtbcount; /* realtime blocks owned */ 1176 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1177 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1178 __be16 d_pad; 1179 } xfs_disk_dquot_t; 1180 1181 /* 1182 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1183 * carrying the unnecessary padding would be a waste of memory. 1184 */ 1185 typedef struct xfs_dqblk { 1186 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1187 char dd_fill[4]; /* filling for posterity */ 1188 1189 /* 1190 * These two are only present on filesystems with the CRC bits set. 1191 */ 1192 __be32 dd_crc; /* checksum */ 1193 __be64 dd_lsn; /* last modification in log */ 1194 uuid_t dd_uuid; /* location information */ 1195 } xfs_dqblk_t; 1196 1197 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1198 1199 /* 1200 * Remote symlink format and access functions. 1201 */ 1202 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1203 1204 struct xfs_dsymlink_hdr { 1205 __be32 sl_magic; 1206 __be32 sl_offset; 1207 __be32 sl_bytes; 1208 __be32 sl_crc; 1209 uuid_t sl_uuid; 1210 __be64 sl_owner; 1211 __be64 sl_blkno; 1212 __be64 sl_lsn; 1213 }; 1214 1215 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1216 1217 /* 1218 * The maximum pathlen is 1024 bytes. Since the minimum file system 1219 * blocksize is 512 bytes, we can get a max of 3 extents back from 1220 * bmapi when crc headers are taken into account. 1221 */ 1222 #define XFS_SYMLINK_MAPS 3 1223 1224 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1225 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1226 sizeof(struct xfs_dsymlink_hdr) : 0)) 1227 1228 1229 /* 1230 * Allocation Btree format definitions 1231 * 1232 * There are two on-disk btrees, one sorted by blockno and one sorted 1233 * by blockcount and blockno. All blocks look the same to make the code 1234 * simpler; if we have time later, we'll make the optimizations. 1235 */ 1236 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1237 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1238 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1239 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1240 1241 /* 1242 * Data record/key structure 1243 */ 1244 typedef struct xfs_alloc_rec { 1245 __be32 ar_startblock; /* starting block number */ 1246 __be32 ar_blockcount; /* count of free blocks */ 1247 } xfs_alloc_rec_t, xfs_alloc_key_t; 1248 1249 typedef struct xfs_alloc_rec_incore { 1250 xfs_agblock_t ar_startblock; /* starting block number */ 1251 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1252 } xfs_alloc_rec_incore_t; 1253 1254 /* btree pointer type */ 1255 typedef __be32 xfs_alloc_ptr_t; 1256 1257 /* 1258 * Block numbers in the AG: 1259 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1260 */ 1261 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1262 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1263 1264 1265 /* 1266 * Inode Allocation Btree format definitions 1267 * 1268 * There is a btree for the inode map per allocation group. 1269 */ 1270 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1271 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1272 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1273 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1274 1275 typedef __uint64_t xfs_inofree_t; 1276 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1277 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1278 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1279 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1280 1281 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1282 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1283 #define XFS_INODES_PER_HOLEMASK_BIT \ 1284 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1285 1286 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1287 { 1288 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1289 } 1290 1291 /* 1292 * The on-disk inode record structure has two formats. The original "full" 1293 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1294 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1295 * count. 1296 * 1297 * The holemask of the sparse record format allows an inode chunk to have holes 1298 * that refer to blocks not owned by the inode record. This facilitates inode 1299 * allocation in the event of severe free space fragmentation. 1300 */ 1301 typedef struct xfs_inobt_rec { 1302 __be32 ir_startino; /* starting inode number */ 1303 union { 1304 struct { 1305 __be32 ir_freecount; /* count of free inodes */ 1306 } f; 1307 struct { 1308 __be16 ir_holemask;/* hole mask for sparse chunks */ 1309 __u8 ir_count; /* total inode count */ 1310 __u8 ir_freecount; /* count of free inodes */ 1311 } sp; 1312 } ir_u; 1313 __be64 ir_free; /* free inode mask */ 1314 } xfs_inobt_rec_t; 1315 1316 typedef struct xfs_inobt_rec_incore { 1317 xfs_agino_t ir_startino; /* starting inode number */ 1318 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1319 __uint8_t ir_count; /* total inode count */ 1320 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1321 xfs_inofree_t ir_free; /* free inode mask */ 1322 } xfs_inobt_rec_incore_t; 1323 1324 static inline bool xfs_inobt_issparse(uint16_t holemask) 1325 { 1326 /* non-zero holemask represents a sparse rec. */ 1327 return holemask; 1328 } 1329 1330 /* 1331 * Key structure 1332 */ 1333 typedef struct xfs_inobt_key { 1334 __be32 ir_startino; /* starting inode number */ 1335 } xfs_inobt_key_t; 1336 1337 /* btree pointer type */ 1338 typedef __be32 xfs_inobt_ptr_t; 1339 1340 /* 1341 * block numbers in the AG. 1342 */ 1343 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1344 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1345 1346 /* 1347 * Reverse mapping btree format definitions 1348 * 1349 * There is a btree for the reverse map per allocation group 1350 */ 1351 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1352 1353 /* 1354 * Ownership info for an extent. This is used to create reverse-mapping 1355 * entries. 1356 */ 1357 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1358 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1359 struct xfs_owner_info { 1360 uint64_t oi_owner; 1361 xfs_fileoff_t oi_offset; 1362 unsigned int oi_flags; 1363 }; 1364 1365 /* 1366 * Special owner types. 1367 * 1368 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1369 * to tell us we have a special owner value. We use these for static metadata 1370 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1371 */ 1372 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1373 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1374 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1375 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1376 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1377 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1378 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1379 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1380 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1381 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1382 1383 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1384 1385 /* 1386 * Data record structure 1387 */ 1388 struct xfs_rmap_rec { 1389 __be32 rm_startblock; /* extent start block */ 1390 __be32 rm_blockcount; /* extent length */ 1391 __be64 rm_owner; /* extent owner */ 1392 __be64 rm_offset; /* offset within the owner */ 1393 }; 1394 1395 /* 1396 * rmap btree record 1397 * rm_offset:63 is the attribute fork flag 1398 * rm_offset:62 is the bmbt block flag 1399 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1400 * rm_offset:54-60 aren't used and should be zero 1401 * rm_offset:0-53 is the block offset within the inode 1402 */ 1403 #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) 1404 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) 1405 #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) 1406 1407 #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) 1408 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1409 XFS_RMAP_OFF_BMBT_BLOCK | \ 1410 XFS_RMAP_OFF_UNWRITTEN) 1411 #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) 1412 1413 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1414 1415 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1416 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1417 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1418 1419 #define RMAPBT_STARTBLOCK_BITLEN 32 1420 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1421 #define RMAPBT_OWNER_BITLEN 64 1422 #define RMAPBT_ATTRFLAG_BITLEN 1 1423 #define RMAPBT_BMBTFLAG_BITLEN 1 1424 #define RMAPBT_EXNTFLAG_BITLEN 1 1425 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1426 #define RMAPBT_OFFSET_BITLEN 54 1427 1428 #define XFS_RMAP_ATTR_FORK (1 << 0) 1429 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1430 #define XFS_RMAP_UNWRITTEN (1 << 2) 1431 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1432 XFS_RMAP_BMBT_BLOCK) 1433 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1434 struct xfs_rmap_irec { 1435 xfs_agblock_t rm_startblock; /* extent start block */ 1436 xfs_extlen_t rm_blockcount; /* extent length */ 1437 __uint64_t rm_owner; /* extent owner */ 1438 __uint64_t rm_offset; /* offset within the owner */ 1439 unsigned int rm_flags; /* state flags */ 1440 }; 1441 1442 /* 1443 * Key structure 1444 * 1445 * We don't use the length for lookups 1446 */ 1447 struct xfs_rmap_key { 1448 __be32 rm_startblock; /* extent start block */ 1449 __be64 rm_owner; /* extent owner */ 1450 __be64 rm_offset; /* offset within the owner */ 1451 } __attribute__((packed)); 1452 1453 /* btree pointer type */ 1454 typedef __be32 xfs_rmap_ptr_t; 1455 1456 #define XFS_RMAP_BLOCK(mp) \ 1457 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1458 XFS_FIBT_BLOCK(mp) + 1 : \ 1459 XFS_IBT_BLOCK(mp) + 1) 1460 1461 /* 1462 * Reference Count Btree format definitions 1463 * 1464 */ 1465 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1466 1467 unsigned int xfs_refc_block(struct xfs_mount *mp); 1468 1469 /* 1470 * Data record/key structure 1471 * 1472 * Each record associates a range of physical blocks (starting at 1473 * rc_startblock and ending rc_blockcount blocks later) with a reference 1474 * count (rc_refcount). Extents that are being used to stage a copy on 1475 * write (CoW) operation are recorded in the refcount btree with a 1476 * refcount of 1. All other records must have a refcount > 1 and must 1477 * track an extent mapped only by file data forks. 1478 * 1479 * Extents with a single owner (attributes, metadata, non-shared file 1480 * data) are not tracked here. Free space is also not tracked here. 1481 * This is consistent with pre-reflink XFS. 1482 */ 1483 1484 /* 1485 * Extents that are being used to stage a copy on write are stored 1486 * in the refcount btree with a refcount of 1 and the upper bit set 1487 * on the startblock. This speeds up mount time deletion of stale 1488 * staging extents because they're all at the right side of the tree. 1489 */ 1490 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) 1491 #define REFCNTBT_COWFLAG_BITLEN 1 1492 #define REFCNTBT_AGBLOCK_BITLEN 31 1493 1494 struct xfs_refcount_rec { 1495 __be32 rc_startblock; /* starting block number */ 1496 __be32 rc_blockcount; /* count of blocks */ 1497 __be32 rc_refcount; /* number of inodes linked here */ 1498 }; 1499 1500 struct xfs_refcount_key { 1501 __be32 rc_startblock; /* starting block number */ 1502 }; 1503 1504 struct xfs_refcount_irec { 1505 xfs_agblock_t rc_startblock; /* starting block number */ 1506 xfs_extlen_t rc_blockcount; /* count of free blocks */ 1507 xfs_nlink_t rc_refcount; /* number of inodes linked here */ 1508 }; 1509 1510 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1511 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1512 1513 /* btree pointer type */ 1514 typedef __be32 xfs_refcount_ptr_t; 1515 1516 1517 /* 1518 * BMAP Btree format definitions 1519 * 1520 * This includes both the root block definition that sits inside an inode fork 1521 * and the record/pointer formats for the leaf/node in the blocks. 1522 */ 1523 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1524 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1525 1526 /* 1527 * Bmap root header, on-disk form only. 1528 */ 1529 typedef struct xfs_bmdr_block { 1530 __be16 bb_level; /* 0 is a leaf */ 1531 __be16 bb_numrecs; /* current # of data records */ 1532 } xfs_bmdr_block_t; 1533 1534 /* 1535 * Bmap btree record and extent descriptor. 1536 * l0:63 is an extent flag (value 1 indicates non-normal). 1537 * l0:9-62 are startoff. 1538 * l0:0-8 and l1:21-63 are startblock. 1539 * l1:0-20 are blockcount. 1540 */ 1541 #define BMBT_EXNTFLAG_BITLEN 1 1542 #define BMBT_STARTOFF_BITLEN 54 1543 #define BMBT_STARTBLOCK_BITLEN 52 1544 #define BMBT_BLOCKCOUNT_BITLEN 21 1545 1546 typedef struct xfs_bmbt_rec { 1547 __be64 l0, l1; 1548 } xfs_bmbt_rec_t; 1549 1550 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1551 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1552 1553 typedef struct xfs_bmbt_rec_host { 1554 __uint64_t l0, l1; 1555 } xfs_bmbt_rec_host_t; 1556 1557 /* 1558 * Values and macros for delayed-allocation startblock fields. 1559 */ 1560 #define STARTBLOCKVALBITS 17 1561 #define STARTBLOCKMASKBITS (15 + 20) 1562 #define STARTBLOCKMASK \ 1563 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1564 1565 static inline int isnullstartblock(xfs_fsblock_t x) 1566 { 1567 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1568 } 1569 1570 static inline xfs_fsblock_t nullstartblock(int k) 1571 { 1572 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1573 return STARTBLOCKMASK | (k); 1574 } 1575 1576 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1577 { 1578 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1579 } 1580 1581 /* 1582 * Possible extent formats. 1583 */ 1584 typedef enum { 1585 XFS_EXTFMT_NOSTATE = 0, 1586 XFS_EXTFMT_HASSTATE 1587 } xfs_exntfmt_t; 1588 1589 /* 1590 * Possible extent states. 1591 */ 1592 typedef enum { 1593 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1594 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1595 } xfs_exntst_t; 1596 1597 /* 1598 * Incore version of above. 1599 */ 1600 typedef struct xfs_bmbt_irec 1601 { 1602 xfs_fileoff_t br_startoff; /* starting file offset */ 1603 xfs_fsblock_t br_startblock; /* starting block number */ 1604 xfs_filblks_t br_blockcount; /* number of blocks */ 1605 xfs_exntst_t br_state; /* extent state */ 1606 } xfs_bmbt_irec_t; 1607 1608 /* 1609 * Key structure for non-leaf levels of the tree. 1610 */ 1611 typedef struct xfs_bmbt_key { 1612 __be64 br_startoff; /* starting file offset */ 1613 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1614 1615 /* btree pointer type */ 1616 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1617 1618 1619 /* 1620 * Generic Btree block format definitions 1621 * 1622 * This is a combination of the actual format used on disk for short and long 1623 * format btrees. The first three fields are shared by both format, but the 1624 * pointers are different and should be used with care. 1625 * 1626 * To get the size of the actual short or long form headers please use the size 1627 * macros below. Never use sizeof(xfs_btree_block). 1628 * 1629 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1630 * with the crc feature bit, and all accesses to them must be conditional on 1631 * that flag. 1632 */ 1633 /* short form block header */ 1634 struct xfs_btree_block_shdr { 1635 __be32 bb_leftsib; 1636 __be32 bb_rightsib; 1637 1638 __be64 bb_blkno; 1639 __be64 bb_lsn; 1640 uuid_t bb_uuid; 1641 __be32 bb_owner; 1642 __le32 bb_crc; 1643 }; 1644 1645 /* long form block header */ 1646 struct xfs_btree_block_lhdr { 1647 __be64 bb_leftsib; 1648 __be64 bb_rightsib; 1649 1650 __be64 bb_blkno; 1651 __be64 bb_lsn; 1652 uuid_t bb_uuid; 1653 __be64 bb_owner; 1654 __le32 bb_crc; 1655 __be32 bb_pad; /* padding for alignment */ 1656 }; 1657 1658 struct xfs_btree_block { 1659 __be32 bb_magic; /* magic number for block type */ 1660 __be16 bb_level; /* 0 is a leaf */ 1661 __be16 bb_numrecs; /* current # of data records */ 1662 union { 1663 struct xfs_btree_block_shdr s; 1664 struct xfs_btree_block_lhdr l; 1665 } bb_u; /* rest */ 1666 }; 1667 1668 /* size of a short form block */ 1669 #define XFS_BTREE_SBLOCK_LEN \ 1670 (offsetof(struct xfs_btree_block, bb_u) + \ 1671 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1672 /* size of a long form block */ 1673 #define XFS_BTREE_LBLOCK_LEN \ 1674 (offsetof(struct xfs_btree_block, bb_u) + \ 1675 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1676 1677 /* sizes of CRC enabled btree blocks */ 1678 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1679 (offsetof(struct xfs_btree_block, bb_u) + \ 1680 sizeof(struct xfs_btree_block_shdr)) 1681 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1682 (offsetof(struct xfs_btree_block, bb_u) + \ 1683 sizeof(struct xfs_btree_block_lhdr)) 1684 1685 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1686 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1687 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1688 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1689 1690 /* 1691 * On-disk XFS access control list structure. 1692 */ 1693 struct xfs_acl_entry { 1694 __be32 ae_tag; 1695 __be32 ae_id; 1696 __be16 ae_perm; 1697 __be16 ae_pad; /* fill the implicit hole in the structure */ 1698 }; 1699 1700 struct xfs_acl { 1701 __be32 acl_cnt; 1702 struct xfs_acl_entry acl_entry[0]; 1703 }; 1704 1705 /* 1706 * The number of ACL entries allowed is defined by the on-disk format. 1707 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1708 * limited only by the maximum size of the xattr that stores the information. 1709 */ 1710 #define XFS_ACL_MAX_ENTRIES(mp) \ 1711 (xfs_sb_version_hascrc(&mp->m_sb) \ 1712 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1713 sizeof(struct xfs_acl_entry) \ 1714 : 25) 1715 1716 #define XFS_ACL_SIZE(cnt) \ 1717 (sizeof(struct xfs_acl) + \ 1718 sizeof(struct xfs_acl_entry) * cnt) 1719 1720 #define XFS_ACL_MAX_SIZE(mp) \ 1721 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1722 1723 1724 /* On-disk XFS extended attribute names */ 1725 #define SGI_ACL_FILE "SGI_ACL_FILE" 1726 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1727 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1728 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1729 1730 #endif /* __XFS_FORMAT_H__ */ 1731