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 typedef struct xfs_dinode { 869 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 870 __be16 di_mode; /* mode and type of file */ 871 __u8 di_version; /* inode version */ 872 __u8 di_format; /* format of di_c data */ 873 __be16 di_onlink; /* old number of links to file */ 874 __be32 di_uid; /* owner's user id */ 875 __be32 di_gid; /* owner's group id */ 876 __be32 di_nlink; /* number of links to file */ 877 __be16 di_projid_lo; /* lower part of owner's project id */ 878 __be16 di_projid_hi; /* higher part owner's project id */ 879 __u8 di_pad[6]; /* unused, zeroed space */ 880 __be16 di_flushiter; /* incremented on flush */ 881 xfs_timestamp_t di_atime; /* time last accessed */ 882 xfs_timestamp_t di_mtime; /* time last modified */ 883 xfs_timestamp_t di_ctime; /* time created/inode modified */ 884 __be64 di_size; /* number of bytes in file */ 885 __be64 di_nblocks; /* # of direct & btree blocks used */ 886 __be32 di_extsize; /* basic/minimum extent size for file */ 887 __be32 di_nextents; /* number of extents in data fork */ 888 __be16 di_anextents; /* number of extents in attribute fork*/ 889 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 890 __s8 di_aformat; /* format of attr fork's data */ 891 __be32 di_dmevmask; /* DMIG event mask */ 892 __be16 di_dmstate; /* DMIG state info */ 893 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 894 __be32 di_gen; /* generation number */ 895 896 /* di_next_unlinked is the only non-core field in the old dinode */ 897 __be32 di_next_unlinked;/* agi unlinked list ptr */ 898 899 /* start of the extended dinode, writable fields */ 900 __le32 di_crc; /* CRC of the inode */ 901 __be64 di_changecount; /* number of attribute changes */ 902 __be64 di_lsn; /* flush sequence */ 903 __be64 di_flags2; /* more random flags */ 904 __be32 di_cowextsize; /* basic cow extent size for file */ 905 __u8 di_pad2[12]; /* more padding for future expansion */ 906 907 /* fields only written to during inode creation */ 908 xfs_timestamp_t di_crtime; /* time created */ 909 __be64 di_ino; /* inode number */ 910 uuid_t di_uuid; /* UUID of the filesystem */ 911 912 /* structure must be padded to 64 bit alignment */ 913 } xfs_dinode_t; 914 915 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 916 917 #define DI_MAX_FLUSH 0xffff 918 919 /* 920 * Size of the core inode on disk. Version 1 and 2 inodes have 921 * the same size, but version 3 has grown a few additional fields. 922 */ 923 static inline uint xfs_dinode_size(int version) 924 { 925 if (version == 3) 926 return sizeof(struct xfs_dinode); 927 return offsetof(struct xfs_dinode, di_crc); 928 } 929 930 /* 931 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 932 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 933 */ 934 #define XFS_MAXLINK ((1U << 31) - 1U) 935 936 /* 937 * Values for di_format 938 */ 939 typedef enum xfs_dinode_fmt { 940 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 941 XFS_DINODE_FMT_LOCAL, /* bulk data */ 942 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 943 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 944 XFS_DINODE_FMT_UUID /* uuid_t */ 945 } xfs_dinode_fmt_t; 946 947 /* 948 * Inode minimum and maximum sizes. 949 */ 950 #define XFS_DINODE_MIN_LOG 8 951 #define XFS_DINODE_MAX_LOG 11 952 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 953 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 954 955 /* 956 * Inode size for given fs. 957 */ 958 #define XFS_LITINO(mp, version) \ 959 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 960 961 /* 962 * Inode data & attribute fork sizes, per inode. 963 */ 964 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 965 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 966 967 #define XFS_DFORK_DSIZE(dip,mp) \ 968 (XFS_DFORK_Q(dip) ? \ 969 XFS_DFORK_BOFF(dip) : \ 970 XFS_LITINO(mp, (dip)->di_version)) 971 #define XFS_DFORK_ASIZE(dip,mp) \ 972 (XFS_DFORK_Q(dip) ? \ 973 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 974 0) 975 #define XFS_DFORK_SIZE(dip,mp,w) \ 976 ((w) == XFS_DATA_FORK ? \ 977 XFS_DFORK_DSIZE(dip, mp) : \ 978 XFS_DFORK_ASIZE(dip, mp)) 979 980 /* 981 * Return pointers to the data or attribute forks. 982 */ 983 #define XFS_DFORK_DPTR(dip) \ 984 ((char *)dip + xfs_dinode_size(dip->di_version)) 985 #define XFS_DFORK_APTR(dip) \ 986 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 987 #define XFS_DFORK_PTR(dip,w) \ 988 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 989 990 #define XFS_DFORK_FORMAT(dip,w) \ 991 ((w) == XFS_DATA_FORK ? \ 992 (dip)->di_format : \ 993 (dip)->di_aformat) 994 #define XFS_DFORK_NEXTENTS(dip,w) \ 995 ((w) == XFS_DATA_FORK ? \ 996 be32_to_cpu((dip)->di_nextents) : \ 997 be16_to_cpu((dip)->di_anextents)) 998 999 /* 1000 * For block and character special files the 32bit dev_t is stored at the 1001 * beginning of the data fork. 1002 */ 1003 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1004 { 1005 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1006 } 1007 1008 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1009 { 1010 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1011 } 1012 1013 /* 1014 * Values for di_flags 1015 */ 1016 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1017 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1018 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1019 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1020 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1021 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1022 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1023 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1024 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1025 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1026 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1027 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1028 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1029 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1030 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1031 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1032 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1033 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1034 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1035 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1036 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1037 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1038 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1039 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1040 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1041 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1042 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1043 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1044 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1045 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1046 1047 #define XFS_DIFLAG_ANY \ 1048 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1049 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1050 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1051 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1052 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1053 1054 /* 1055 * Values for di_flags2 These start by being exposed to userspace in the upper 1056 * 16 bits of the XFS_XFLAG_s range. 1057 */ 1058 #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ 1059 #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ 1060 #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ 1061 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) 1062 #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) 1063 #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) 1064 1065 #define XFS_DIFLAG2_ANY \ 1066 (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) 1067 1068 /* 1069 * Inode number format: 1070 * low inopblog bits - offset in block 1071 * next agblklog bits - block number in ag 1072 * next agno_log bits - ag number 1073 * high agno_log-agblklog-inopblog bits - 0 1074 */ 1075 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1076 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1077 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1078 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1079 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1080 #define XFS_INO_BITS(mp) \ 1081 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1082 #define XFS_INO_TO_AGNO(mp,i) \ 1083 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1084 #define XFS_INO_TO_AGINO(mp,i) \ 1085 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1086 #define XFS_INO_TO_AGBNO(mp,i) \ 1087 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1088 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1089 #define XFS_INO_TO_OFFSET(mp,i) \ 1090 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1091 #define XFS_INO_TO_FSB(mp,i) \ 1092 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1093 #define XFS_AGINO_TO_INO(mp,a,i) \ 1094 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1095 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1096 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1097 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1098 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1099 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1100 1101 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1102 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1103 1104 /* 1105 * RealTime Device format definitions 1106 */ 1107 1108 /* Min and max rt extent sizes, specified in bytes */ 1109 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1110 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1111 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1112 1113 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1114 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1115 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1116 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1117 1118 /* 1119 * RT Summary and bit manipulation macros. 1120 */ 1121 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1122 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1123 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1124 #define XFS_SUMPTR(mp,bp,so) \ 1125 ((xfs_suminfo_t *)((bp)->b_addr + \ 1126 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1127 1128 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1129 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1130 #define XFS_BITTOWORD(mp,bi) \ 1131 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1132 1133 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1134 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1135 1136 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1137 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1138 1139 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1140 1141 /* 1142 * Dquot and dquot block format definitions 1143 */ 1144 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1145 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1146 1147 /* 1148 * This is the main portion of the on-disk representation of quota 1149 * information for a user. This is the q_core of the xfs_dquot_t that 1150 * is kept in kernel memory. We pad this with some more expansion room 1151 * to construct the on disk structure. 1152 */ 1153 typedef struct xfs_disk_dquot { 1154 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1155 __u8 d_version; /* dquot version */ 1156 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1157 __be32 d_id; /* user,project,group id */ 1158 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1159 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1160 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1161 __be64 d_ino_softlimit;/* preferred inode limit */ 1162 __be64 d_bcount; /* disk blocks owned by the user */ 1163 __be64 d_icount; /* inodes owned by the user */ 1164 __be32 d_itimer; /* zero if within inode limits if not, 1165 this is when we refuse service */ 1166 __be32 d_btimer; /* similar to above; for disk blocks */ 1167 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1168 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1169 __be32 d_pad0; /* 64 bit align */ 1170 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1171 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1172 __be64 d_rtbcount; /* realtime blocks owned */ 1173 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1174 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1175 __be16 d_pad; 1176 } xfs_disk_dquot_t; 1177 1178 /* 1179 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1180 * carrying the unnecessary padding would be a waste of memory. 1181 */ 1182 typedef struct xfs_dqblk { 1183 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1184 char dd_fill[4]; /* filling for posterity */ 1185 1186 /* 1187 * These two are only present on filesystems with the CRC bits set. 1188 */ 1189 __be32 dd_crc; /* checksum */ 1190 __be64 dd_lsn; /* last modification in log */ 1191 uuid_t dd_uuid; /* location information */ 1192 } xfs_dqblk_t; 1193 1194 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1195 1196 /* 1197 * Remote symlink format and access functions. 1198 */ 1199 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1200 1201 struct xfs_dsymlink_hdr { 1202 __be32 sl_magic; 1203 __be32 sl_offset; 1204 __be32 sl_bytes; 1205 __be32 sl_crc; 1206 uuid_t sl_uuid; 1207 __be64 sl_owner; 1208 __be64 sl_blkno; 1209 __be64 sl_lsn; 1210 }; 1211 1212 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1213 1214 /* 1215 * The maximum pathlen is 1024 bytes. Since the minimum file system 1216 * blocksize is 512 bytes, we can get a max of 3 extents back from 1217 * bmapi when crc headers are taken into account. 1218 */ 1219 #define XFS_SYMLINK_MAPS 3 1220 1221 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1222 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1223 sizeof(struct xfs_dsymlink_hdr) : 0)) 1224 1225 1226 /* 1227 * Allocation Btree format definitions 1228 * 1229 * There are two on-disk btrees, one sorted by blockno and one sorted 1230 * by blockcount and blockno. All blocks look the same to make the code 1231 * simpler; if we have time later, we'll make the optimizations. 1232 */ 1233 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1234 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1235 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1236 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1237 1238 /* 1239 * Data record/key structure 1240 */ 1241 typedef struct xfs_alloc_rec { 1242 __be32 ar_startblock; /* starting block number */ 1243 __be32 ar_blockcount; /* count of free blocks */ 1244 } xfs_alloc_rec_t, xfs_alloc_key_t; 1245 1246 typedef struct xfs_alloc_rec_incore { 1247 xfs_agblock_t ar_startblock; /* starting block number */ 1248 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1249 } xfs_alloc_rec_incore_t; 1250 1251 /* btree pointer type */ 1252 typedef __be32 xfs_alloc_ptr_t; 1253 1254 /* 1255 * Block numbers in the AG: 1256 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1257 */ 1258 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1259 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1260 1261 1262 /* 1263 * Inode Allocation Btree format definitions 1264 * 1265 * There is a btree for the inode map per allocation group. 1266 */ 1267 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1268 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1269 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1270 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1271 1272 typedef __uint64_t xfs_inofree_t; 1273 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1274 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1275 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1276 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1277 1278 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1279 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1280 #define XFS_INODES_PER_HOLEMASK_BIT \ 1281 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1282 1283 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1284 { 1285 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1286 } 1287 1288 /* 1289 * The on-disk inode record structure has two formats. The original "full" 1290 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1291 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1292 * count. 1293 * 1294 * The holemask of the sparse record format allows an inode chunk to have holes 1295 * that refer to blocks not owned by the inode record. This facilitates inode 1296 * allocation in the event of severe free space fragmentation. 1297 */ 1298 typedef struct xfs_inobt_rec { 1299 __be32 ir_startino; /* starting inode number */ 1300 union { 1301 struct { 1302 __be32 ir_freecount; /* count of free inodes */ 1303 } f; 1304 struct { 1305 __be16 ir_holemask;/* hole mask for sparse chunks */ 1306 __u8 ir_count; /* total inode count */ 1307 __u8 ir_freecount; /* count of free inodes */ 1308 } sp; 1309 } ir_u; 1310 __be64 ir_free; /* free inode mask */ 1311 } xfs_inobt_rec_t; 1312 1313 typedef struct xfs_inobt_rec_incore { 1314 xfs_agino_t ir_startino; /* starting inode number */ 1315 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1316 __uint8_t ir_count; /* total inode count */ 1317 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1318 xfs_inofree_t ir_free; /* free inode mask */ 1319 } xfs_inobt_rec_incore_t; 1320 1321 static inline bool xfs_inobt_issparse(uint16_t holemask) 1322 { 1323 /* non-zero holemask represents a sparse rec. */ 1324 return holemask; 1325 } 1326 1327 /* 1328 * Key structure 1329 */ 1330 typedef struct xfs_inobt_key { 1331 __be32 ir_startino; /* starting inode number */ 1332 } xfs_inobt_key_t; 1333 1334 /* btree pointer type */ 1335 typedef __be32 xfs_inobt_ptr_t; 1336 1337 /* 1338 * block numbers in the AG. 1339 */ 1340 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1341 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1342 1343 /* 1344 * Reverse mapping btree format definitions 1345 * 1346 * There is a btree for the reverse map per allocation group 1347 */ 1348 #define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */ 1349 1350 /* 1351 * Ownership info for an extent. This is used to create reverse-mapping 1352 * entries. 1353 */ 1354 #define XFS_OWNER_INFO_ATTR_FORK (1 << 0) 1355 #define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1) 1356 struct xfs_owner_info { 1357 uint64_t oi_owner; 1358 xfs_fileoff_t oi_offset; 1359 unsigned int oi_flags; 1360 }; 1361 1362 /* 1363 * Special owner types. 1364 * 1365 * Seeing as we only support up to 8EB, we have the upper bit of the owner field 1366 * to tell us we have a special owner value. We use these for static metadata 1367 * allocated at mkfs/growfs time, as well as for freespace management metadata. 1368 */ 1369 #define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */ 1370 #define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */ 1371 #define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */ 1372 #define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */ 1373 #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ 1374 #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ 1375 #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ 1376 #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ 1377 #define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ 1378 #define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ 1379 1380 #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) 1381 1382 /* 1383 * Data record structure 1384 */ 1385 struct xfs_rmap_rec { 1386 __be32 rm_startblock; /* extent start block */ 1387 __be32 rm_blockcount; /* extent length */ 1388 __be64 rm_owner; /* extent owner */ 1389 __be64 rm_offset; /* offset within the owner */ 1390 }; 1391 1392 /* 1393 * rmap btree record 1394 * rm_offset:63 is the attribute fork flag 1395 * rm_offset:62 is the bmbt block flag 1396 * rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt) 1397 * rm_offset:54-60 aren't used and should be zero 1398 * rm_offset:0-53 is the block offset within the inode 1399 */ 1400 #define XFS_RMAP_OFF_ATTR_FORK ((__uint64_t)1ULL << 63) 1401 #define XFS_RMAP_OFF_BMBT_BLOCK ((__uint64_t)1ULL << 62) 1402 #define XFS_RMAP_OFF_UNWRITTEN ((__uint64_t)1ULL << 61) 1403 1404 #define XFS_RMAP_LEN_MAX ((__uint32_t)~0U) 1405 #define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \ 1406 XFS_RMAP_OFF_BMBT_BLOCK | \ 1407 XFS_RMAP_OFF_UNWRITTEN) 1408 #define XFS_RMAP_OFF_MASK ((__uint64_t)0x3FFFFFFFFFFFFFULL) 1409 1410 #define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK) 1411 1412 #define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK)) 1413 #define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK)) 1414 #define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN)) 1415 1416 #define RMAPBT_STARTBLOCK_BITLEN 32 1417 #define RMAPBT_BLOCKCOUNT_BITLEN 32 1418 #define RMAPBT_OWNER_BITLEN 64 1419 #define RMAPBT_ATTRFLAG_BITLEN 1 1420 #define RMAPBT_BMBTFLAG_BITLEN 1 1421 #define RMAPBT_EXNTFLAG_BITLEN 1 1422 #define RMAPBT_UNUSED_OFFSET_BITLEN 7 1423 #define RMAPBT_OFFSET_BITLEN 54 1424 1425 #define XFS_RMAP_ATTR_FORK (1 << 0) 1426 #define XFS_RMAP_BMBT_BLOCK (1 << 1) 1427 #define XFS_RMAP_UNWRITTEN (1 << 2) 1428 #define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \ 1429 XFS_RMAP_BMBT_BLOCK) 1430 #define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN) 1431 struct xfs_rmap_irec { 1432 xfs_agblock_t rm_startblock; /* extent start block */ 1433 xfs_extlen_t rm_blockcount; /* extent length */ 1434 __uint64_t rm_owner; /* extent owner */ 1435 __uint64_t rm_offset; /* offset within the owner */ 1436 unsigned int rm_flags; /* state flags */ 1437 }; 1438 1439 /* 1440 * Key structure 1441 * 1442 * We don't use the length for lookups 1443 */ 1444 struct xfs_rmap_key { 1445 __be32 rm_startblock; /* extent start block */ 1446 __be64 rm_owner; /* extent owner */ 1447 __be64 rm_offset; /* offset within the owner */ 1448 } __attribute__((packed)); 1449 1450 /* btree pointer type */ 1451 typedef __be32 xfs_rmap_ptr_t; 1452 1453 #define XFS_RMAP_BLOCK(mp) \ 1454 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1455 XFS_FIBT_BLOCK(mp) + 1 : \ 1456 XFS_IBT_BLOCK(mp) + 1) 1457 1458 /* 1459 * Reference Count Btree format definitions 1460 * 1461 */ 1462 #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ 1463 1464 unsigned int xfs_refc_block(struct xfs_mount *mp); 1465 1466 /* 1467 * Data record/key structure 1468 * 1469 * Each record associates a range of physical blocks (starting at 1470 * rc_startblock and ending rc_blockcount blocks later) with a reference 1471 * count (rc_refcount). Extents that are being used to stage a copy on 1472 * write (CoW) operation are recorded in the refcount btree with a 1473 * refcount of 1. All other records must have a refcount > 1 and must 1474 * track an extent mapped only by file data forks. 1475 * 1476 * Extents with a single owner (attributes, metadata, non-shared file 1477 * data) are not tracked here. Free space is also not tracked here. 1478 * This is consistent with pre-reflink XFS. 1479 */ 1480 1481 /* 1482 * Extents that are being used to stage a copy on write are stored 1483 * in the refcount btree with a refcount of 1 and the upper bit set 1484 * on the startblock. This speeds up mount time deletion of stale 1485 * staging extents because they're all at the right side of the tree. 1486 */ 1487 #define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) 1488 #define REFCNTBT_COWFLAG_BITLEN 1 1489 #define REFCNTBT_AGBLOCK_BITLEN 31 1490 1491 struct xfs_refcount_rec { 1492 __be32 rc_startblock; /* starting block number */ 1493 __be32 rc_blockcount; /* count of blocks */ 1494 __be32 rc_refcount; /* number of inodes linked here */ 1495 }; 1496 1497 struct xfs_refcount_key { 1498 __be32 rc_startblock; /* starting block number */ 1499 }; 1500 1501 struct xfs_refcount_irec { 1502 xfs_agblock_t rc_startblock; /* starting block number */ 1503 xfs_extlen_t rc_blockcount; /* count of free blocks */ 1504 xfs_nlink_t rc_refcount; /* number of inodes linked here */ 1505 }; 1506 1507 #define MAXREFCOUNT ((xfs_nlink_t)~0U) 1508 #define MAXREFCEXTLEN ((xfs_extlen_t)~0U) 1509 1510 /* btree pointer type */ 1511 typedef __be32 xfs_refcount_ptr_t; 1512 1513 1514 /* 1515 * BMAP Btree format definitions 1516 * 1517 * This includes both the root block definition that sits inside an inode fork 1518 * and the record/pointer formats for the leaf/node in the blocks. 1519 */ 1520 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1521 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1522 1523 /* 1524 * Bmap root header, on-disk form only. 1525 */ 1526 typedef struct xfs_bmdr_block { 1527 __be16 bb_level; /* 0 is a leaf */ 1528 __be16 bb_numrecs; /* current # of data records */ 1529 } xfs_bmdr_block_t; 1530 1531 /* 1532 * Bmap btree record and extent descriptor. 1533 * l0:63 is an extent flag (value 1 indicates non-normal). 1534 * l0:9-62 are startoff. 1535 * l0:0-8 and l1:21-63 are startblock. 1536 * l1:0-20 are blockcount. 1537 */ 1538 #define BMBT_EXNTFLAG_BITLEN 1 1539 #define BMBT_STARTOFF_BITLEN 54 1540 #define BMBT_STARTBLOCK_BITLEN 52 1541 #define BMBT_BLOCKCOUNT_BITLEN 21 1542 1543 typedef struct xfs_bmbt_rec { 1544 __be64 l0, l1; 1545 } xfs_bmbt_rec_t; 1546 1547 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1548 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1549 1550 typedef struct xfs_bmbt_rec_host { 1551 __uint64_t l0, l1; 1552 } xfs_bmbt_rec_host_t; 1553 1554 /* 1555 * Values and macros for delayed-allocation startblock fields. 1556 */ 1557 #define STARTBLOCKVALBITS 17 1558 #define STARTBLOCKMASKBITS (15 + 20) 1559 #define STARTBLOCKMASK \ 1560 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1561 1562 static inline int isnullstartblock(xfs_fsblock_t x) 1563 { 1564 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1565 } 1566 1567 static inline xfs_fsblock_t nullstartblock(int k) 1568 { 1569 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1570 return STARTBLOCKMASK | (k); 1571 } 1572 1573 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1574 { 1575 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1576 } 1577 1578 /* 1579 * Possible extent states. 1580 */ 1581 typedef enum { 1582 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1583 } xfs_exntst_t; 1584 1585 /* 1586 * Incore version of above. 1587 */ 1588 typedef struct xfs_bmbt_irec 1589 { 1590 xfs_fileoff_t br_startoff; /* starting file offset */ 1591 xfs_fsblock_t br_startblock; /* starting block number */ 1592 xfs_filblks_t br_blockcount; /* number of blocks */ 1593 xfs_exntst_t br_state; /* extent state */ 1594 } xfs_bmbt_irec_t; 1595 1596 /* 1597 * Key structure for non-leaf levels of the tree. 1598 */ 1599 typedef struct xfs_bmbt_key { 1600 __be64 br_startoff; /* starting file offset */ 1601 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1602 1603 /* btree pointer type */ 1604 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1605 1606 1607 /* 1608 * Generic Btree block format definitions 1609 * 1610 * This is a combination of the actual format used on disk for short and long 1611 * format btrees. The first three fields are shared by both format, but the 1612 * pointers are different and should be used with care. 1613 * 1614 * To get the size of the actual short or long form headers please use the size 1615 * macros below. Never use sizeof(xfs_btree_block). 1616 * 1617 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1618 * with the crc feature bit, and all accesses to them must be conditional on 1619 * that flag. 1620 */ 1621 /* short form block header */ 1622 struct xfs_btree_block_shdr { 1623 __be32 bb_leftsib; 1624 __be32 bb_rightsib; 1625 1626 __be64 bb_blkno; 1627 __be64 bb_lsn; 1628 uuid_t bb_uuid; 1629 __be32 bb_owner; 1630 __le32 bb_crc; 1631 }; 1632 1633 /* long form block header */ 1634 struct xfs_btree_block_lhdr { 1635 __be64 bb_leftsib; 1636 __be64 bb_rightsib; 1637 1638 __be64 bb_blkno; 1639 __be64 bb_lsn; 1640 uuid_t bb_uuid; 1641 __be64 bb_owner; 1642 __le32 bb_crc; 1643 __be32 bb_pad; /* padding for alignment */ 1644 }; 1645 1646 struct xfs_btree_block { 1647 __be32 bb_magic; /* magic number for block type */ 1648 __be16 bb_level; /* 0 is a leaf */ 1649 __be16 bb_numrecs; /* current # of data records */ 1650 union { 1651 struct xfs_btree_block_shdr s; 1652 struct xfs_btree_block_lhdr l; 1653 } bb_u; /* rest */ 1654 }; 1655 1656 /* size of a short form block */ 1657 #define XFS_BTREE_SBLOCK_LEN \ 1658 (offsetof(struct xfs_btree_block, bb_u) + \ 1659 offsetof(struct xfs_btree_block_shdr, bb_blkno)) 1660 /* size of a long form block */ 1661 #define XFS_BTREE_LBLOCK_LEN \ 1662 (offsetof(struct xfs_btree_block, bb_u) + \ 1663 offsetof(struct xfs_btree_block_lhdr, bb_blkno)) 1664 1665 /* sizes of CRC enabled btree blocks */ 1666 #define XFS_BTREE_SBLOCK_CRC_LEN \ 1667 (offsetof(struct xfs_btree_block, bb_u) + \ 1668 sizeof(struct xfs_btree_block_shdr)) 1669 #define XFS_BTREE_LBLOCK_CRC_LEN \ 1670 (offsetof(struct xfs_btree_block, bb_u) + \ 1671 sizeof(struct xfs_btree_block_lhdr)) 1672 1673 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1674 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1675 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1676 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1677 1678 /* 1679 * On-disk XFS access control list structure. 1680 */ 1681 struct xfs_acl_entry { 1682 __be32 ae_tag; 1683 __be32 ae_id; 1684 __be16 ae_perm; 1685 __be16 ae_pad; /* fill the implicit hole in the structure */ 1686 }; 1687 1688 struct xfs_acl { 1689 __be32 acl_cnt; 1690 struct xfs_acl_entry acl_entry[0]; 1691 }; 1692 1693 /* 1694 * The number of ACL entries allowed is defined by the on-disk format. 1695 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1696 * limited only by the maximum size of the xattr that stores the information. 1697 */ 1698 #define XFS_ACL_MAX_ENTRIES(mp) \ 1699 (xfs_sb_version_hascrc(&mp->m_sb) \ 1700 ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1701 sizeof(struct xfs_acl_entry) \ 1702 : 25) 1703 1704 #define XFS_ACL_SIZE(cnt) \ 1705 (sizeof(struct xfs_acl) + \ 1706 sizeof(struct xfs_acl_entry) * cnt) 1707 1708 #define XFS_ACL_MAX_SIZE(mp) \ 1709 XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp))) 1710 1711 1712 /* On-disk XFS extended attribute names */ 1713 #define SGI_ACL_FILE "SGI_ACL_FILE" 1714 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1715 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1716 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1717 1718 #endif /* __XFS_FORMAT_H__ */ 1719