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 * Supported feature bit list is just all bits in the versionnum field because 64 * we've used them all up and understand them all. Except, of course, for the 65 * shared superblock bit, which nobody knows what it does and so is unsupported. 66 */ 67 #define XFS_SB_VERSION_OKBITS \ 68 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ 69 ~XFS_SB_VERSION_SHAREDBIT) 70 71 /* 72 * There are two words to hold XFS "feature" bits: the original 73 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 75 * 76 * These defines represent bits in sb_features2. 77 */ 78 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 79 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 80 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 81 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 82 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 83 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 84 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ 85 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ 86 87 #define XFS_SB_VERSION2_OKBITS \ 88 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 89 XFS_SB_VERSION2_ATTR2BIT | \ 90 XFS_SB_VERSION2_PROJID32BIT | \ 91 XFS_SB_VERSION2_FTYPE) 92 93 /* 94 * Superblock - in core version. Must match the ondisk version below. 95 * Must be padded to 64 bit alignment. 96 */ 97 typedef struct xfs_sb { 98 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 99 __uint32_t sb_blocksize; /* logical block size, bytes */ 100 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 101 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 102 xfs_rtblock_t sb_rextents; /* number of realtime extents */ 103 uuid_t sb_uuid; /* file system unique id */ 104 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 105 xfs_ino_t sb_rootino; /* root inode number */ 106 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 107 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 108 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 109 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 110 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 111 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 112 xfs_extlen_t sb_logblocks; /* number of log blocks */ 113 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 114 __uint16_t sb_sectsize; /* volume sector size, bytes */ 115 __uint16_t sb_inodesize; /* inode size, bytes */ 116 __uint16_t sb_inopblock; /* inodes per block */ 117 char sb_fname[12]; /* file system name */ 118 __uint8_t sb_blocklog; /* log2 of sb_blocksize */ 119 __uint8_t sb_sectlog; /* log2 of sb_sectsize */ 120 __uint8_t sb_inodelog; /* log2 of sb_inodesize */ 121 __uint8_t sb_inopblog; /* log2 of sb_inopblock */ 122 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 123 __uint8_t sb_rextslog; /* log2 of sb_rextents */ 124 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 125 __uint8_t sb_imax_pct; /* max % of fs for inode space */ 126 /* statistics */ 127 /* 128 * These fields must remain contiguous. If you really 129 * want to change their layout, make sure you fix the 130 * code in xfs_trans_apply_sb_deltas(). 131 */ 132 __uint64_t sb_icount; /* allocated inodes */ 133 __uint64_t sb_ifree; /* free inodes */ 134 __uint64_t sb_fdblocks; /* free data blocks */ 135 __uint64_t sb_frextents; /* free realtime extents */ 136 /* 137 * End contiguous fields. 138 */ 139 xfs_ino_t sb_uquotino; /* user quota inode */ 140 xfs_ino_t sb_gquotino; /* group quota inode */ 141 __uint16_t sb_qflags; /* quota flags */ 142 __uint8_t sb_flags; /* misc. flags */ 143 __uint8_t sb_shared_vn; /* shared version number */ 144 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 145 __uint32_t sb_unit; /* stripe or raid unit */ 146 __uint32_t sb_width; /* stripe or raid width */ 147 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 148 __uint8_t sb_logsectlog; /* log2 of the log sector size */ 149 __uint16_t sb_logsectsize; /* sector size for the log, bytes */ 150 __uint32_t sb_logsunit; /* stripe unit size for the log */ 151 __uint32_t sb_features2; /* additional feature bits */ 152 153 /* 154 * bad features2 field as a result of failing to pad the sb structure to 155 * 64 bits. Some machines will be using this field for features2 bits. 156 * Easiest just to mark it bad and not use it for anything else. 157 * 158 * This is not kept up to date in memory; it is always overwritten by 159 * the value in sb_features2 when formatting the incore superblock to 160 * the disk buffer. 161 */ 162 __uint32_t sb_bad_features2; 163 164 /* version 5 superblock fields start here */ 165 166 /* feature masks */ 167 __uint32_t sb_features_compat; 168 __uint32_t sb_features_ro_compat; 169 __uint32_t sb_features_incompat; 170 __uint32_t sb_features_log_incompat; 171 172 __uint32_t sb_crc; /* superblock crc */ 173 __uint32_t sb_pad; 174 175 xfs_ino_t sb_pquotino; /* project quota inode */ 176 xfs_lsn_t sb_lsn; /* last write sequence */ 177 178 /* must be padded to 64 bit alignment */ 179 } xfs_sb_t; 180 181 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) 182 183 /* 184 * Superblock - on disk version. Must match the in core version above. 185 * Must be padded to 64 bit alignment. 186 */ 187 typedef struct xfs_dsb { 188 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 189 __be32 sb_blocksize; /* logical block size, bytes */ 190 __be64 sb_dblocks; /* number of data blocks */ 191 __be64 sb_rblocks; /* number of realtime blocks */ 192 __be64 sb_rextents; /* number of realtime extents */ 193 uuid_t sb_uuid; /* file system unique id */ 194 __be64 sb_logstart; /* starting block of log if internal */ 195 __be64 sb_rootino; /* root inode number */ 196 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 197 __be64 sb_rsumino; /* summary inode for rt bitmap */ 198 __be32 sb_rextsize; /* realtime extent size, blocks */ 199 __be32 sb_agblocks; /* size of an allocation group */ 200 __be32 sb_agcount; /* number of allocation groups */ 201 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 202 __be32 sb_logblocks; /* number of log blocks */ 203 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 204 __be16 sb_sectsize; /* volume sector size, bytes */ 205 __be16 sb_inodesize; /* inode size, bytes */ 206 __be16 sb_inopblock; /* inodes per block */ 207 char sb_fname[12]; /* file system name */ 208 __u8 sb_blocklog; /* log2 of sb_blocksize */ 209 __u8 sb_sectlog; /* log2 of sb_sectsize */ 210 __u8 sb_inodelog; /* log2 of sb_inodesize */ 211 __u8 sb_inopblog; /* log2 of sb_inopblock */ 212 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 213 __u8 sb_rextslog; /* log2 of sb_rextents */ 214 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 215 __u8 sb_imax_pct; /* max % of fs for inode space */ 216 /* statistics */ 217 /* 218 * These fields must remain contiguous. If you really 219 * want to change their layout, make sure you fix the 220 * code in xfs_trans_apply_sb_deltas(). 221 */ 222 __be64 sb_icount; /* allocated inodes */ 223 __be64 sb_ifree; /* free inodes */ 224 __be64 sb_fdblocks; /* free data blocks */ 225 __be64 sb_frextents; /* free realtime extents */ 226 /* 227 * End contiguous fields. 228 */ 229 __be64 sb_uquotino; /* user quota inode */ 230 __be64 sb_gquotino; /* group quota inode */ 231 __be16 sb_qflags; /* quota flags */ 232 __u8 sb_flags; /* misc. flags */ 233 __u8 sb_shared_vn; /* shared version number */ 234 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 235 __be32 sb_unit; /* stripe or raid unit */ 236 __be32 sb_width; /* stripe or raid width */ 237 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 238 __u8 sb_logsectlog; /* log2 of the log sector size */ 239 __be16 sb_logsectsize; /* sector size for the log, bytes */ 240 __be32 sb_logsunit; /* stripe unit size for the log */ 241 __be32 sb_features2; /* additional feature bits */ 242 /* 243 * bad features2 field as a result of failing to pad the sb 244 * structure to 64 bits. Some machines will be using this field 245 * for features2 bits. Easiest just to mark it bad and not use 246 * it for anything else. 247 */ 248 __be32 sb_bad_features2; 249 250 /* version 5 superblock fields start here */ 251 252 /* feature masks */ 253 __be32 sb_features_compat; 254 __be32 sb_features_ro_compat; 255 __be32 sb_features_incompat; 256 __be32 sb_features_log_incompat; 257 258 __le32 sb_crc; /* superblock crc */ 259 __be32 sb_pad; 260 261 __be64 sb_pquotino; /* project quota inode */ 262 __be64 sb_lsn; /* last write sequence */ 263 264 /* must be padded to 64 bit alignment */ 265 } xfs_dsb_t; 266 267 /* 268 * Sequence number values for the fields. 269 */ 270 typedef enum { 271 XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS, 272 XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO, 273 XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS, 274 XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS, 275 XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE, 276 XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG, 277 XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG, 278 XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT, 279 XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO, 280 XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN, 281 XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG, 282 XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT, 283 XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT, 284 XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT, 285 XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD, 286 XFS_SBS_PQUOTINO, XFS_SBS_LSN, 287 XFS_SBS_FIELDCOUNT 288 } xfs_sb_field_t; 289 290 /* 291 * Mask values, defined based on the xfs_sb_field_t values. 292 * Only define the ones we're using. 293 */ 294 #define XFS_SB_MVAL(x) (1LL << XFS_SBS_ ## x) 295 #define XFS_SB_UUID XFS_SB_MVAL(UUID) 296 #define XFS_SB_FNAME XFS_SB_MVAL(FNAME) 297 #define XFS_SB_ROOTINO XFS_SB_MVAL(ROOTINO) 298 #define XFS_SB_RBMINO XFS_SB_MVAL(RBMINO) 299 #define XFS_SB_RSUMINO XFS_SB_MVAL(RSUMINO) 300 #define XFS_SB_VERSIONNUM XFS_SB_MVAL(VERSIONNUM) 301 #define XFS_SB_UQUOTINO XFS_SB_MVAL(UQUOTINO) 302 #define XFS_SB_GQUOTINO XFS_SB_MVAL(GQUOTINO) 303 #define XFS_SB_QFLAGS XFS_SB_MVAL(QFLAGS) 304 #define XFS_SB_SHARED_VN XFS_SB_MVAL(SHARED_VN) 305 #define XFS_SB_UNIT XFS_SB_MVAL(UNIT) 306 #define XFS_SB_WIDTH XFS_SB_MVAL(WIDTH) 307 #define XFS_SB_ICOUNT XFS_SB_MVAL(ICOUNT) 308 #define XFS_SB_IFREE XFS_SB_MVAL(IFREE) 309 #define XFS_SB_FDBLOCKS XFS_SB_MVAL(FDBLOCKS) 310 #define XFS_SB_FEATURES2 (XFS_SB_MVAL(FEATURES2) | \ 311 XFS_SB_MVAL(BAD_FEATURES2)) 312 #define XFS_SB_FEATURES_COMPAT XFS_SB_MVAL(FEATURES_COMPAT) 313 #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT) 314 #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT) 315 #define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT) 316 #define XFS_SB_CRC XFS_SB_MVAL(CRC) 317 #define XFS_SB_PQUOTINO XFS_SB_MVAL(PQUOTINO) 318 #define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT) 319 #define XFS_SB_ALL_BITS ((1LL << XFS_SB_NUM_BITS) - 1) 320 #define XFS_SB_MOD_BITS \ 321 (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \ 322 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \ 323 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \ 324 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \ 325 XFS_SB_FEATURES_COMPAT | XFS_SB_FEATURES_RO_COMPAT | \ 326 XFS_SB_FEATURES_INCOMPAT | XFS_SB_FEATURES_LOG_INCOMPAT | \ 327 XFS_SB_PQUOTINO) 328 329 330 /* 331 * Misc. Flags - warning - these will be cleared by xfs_repair unless 332 * a feature bit is set when the flag is used. 333 */ 334 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 335 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 336 337 /* 338 * define max. shared version we can interoperate with 339 */ 340 #define XFS_SB_MAX_SHARED_VN 0 341 342 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 343 344 /* 345 * The first XFS version we support is a v4 superblock with V2 directories. 346 */ 347 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) 348 { 349 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 350 return false; 351 352 /* check for unknown features in the fs */ 353 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 354 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 355 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 356 return false; 357 358 return true; 359 } 360 361 static inline bool xfs_sb_good_version(struct xfs_sb *sbp) 362 { 363 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) 364 return true; 365 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) 366 return xfs_sb_good_v4_features(sbp); 367 return false; 368 } 369 370 /* 371 * Detect a mismatched features2 field. Older kernels read/wrote 372 * this into the wrong slot, so to be safe we keep them in sync. 373 */ 374 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 375 { 376 return sbp->sb_bad_features2 != sbp->sb_features2; 377 } 378 379 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 380 { 381 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 382 } 383 384 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 385 { 386 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 387 } 388 389 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 390 { 391 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 392 } 393 394 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 395 { 396 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 397 } 398 399 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) 400 { 401 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 402 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); 403 } 404 405 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 406 { 407 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 408 } 409 410 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) 411 { 412 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 413 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); 414 } 415 416 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp) 417 { 418 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 419 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT); 420 } 421 422 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 423 { 424 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 425 } 426 427 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 428 { 429 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 430 } 431 432 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 433 { 434 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 435 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 436 } 437 438 /* 439 * sb_features2 bit version macros. 440 */ 441 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) 442 { 443 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 444 (xfs_sb_version_hasmorebits(sbp) && 445 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); 446 } 447 448 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) 449 { 450 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 451 (xfs_sb_version_hasmorebits(sbp) && 452 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); 453 } 454 455 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 456 { 457 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 458 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 459 } 460 461 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) 462 { 463 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; 464 if (!sbp->sb_features2) 465 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; 466 } 467 468 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) 469 { 470 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 471 (xfs_sb_version_hasmorebits(sbp) && 472 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); 473 } 474 475 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) 476 { 477 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 478 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 479 } 480 481 /* 482 * Extended v5 superblock feature masks. These are to be used for new v5 483 * superblock features only. 484 * 485 * Compat features are new features that old kernels will not notice or affect 486 * and so can mount read-write without issues. 487 * 488 * RO-Compat (read only) are features that old kernels can read but will break 489 * if they write. Hence only read-only mounts of such filesystems are allowed on 490 * kernels that don't support the feature bit. 491 * 492 * InCompat features are features which old kernels will not understand and so 493 * must not mount. 494 * 495 * Log-InCompat features are for changes to log formats or new transactions that 496 * can't be replayed on older kernels. The fields are set when the filesystem is 497 * mounted, and a clean unmount clears the fields. 498 */ 499 #define XFS_SB_FEAT_COMPAT_ALL 0 500 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 501 static inline bool 502 xfs_sb_has_compat_feature( 503 struct xfs_sb *sbp, 504 __uint32_t feature) 505 { 506 return (sbp->sb_features_compat & feature) != 0; 507 } 508 509 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 510 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 511 (XFS_SB_FEAT_RO_COMPAT_FINOBT) 512 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 513 static inline bool 514 xfs_sb_has_ro_compat_feature( 515 struct xfs_sb *sbp, 516 __uint32_t feature) 517 { 518 return (sbp->sb_features_ro_compat & feature) != 0; 519 } 520 521 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 522 #define XFS_SB_FEAT_INCOMPAT_ALL \ 523 (XFS_SB_FEAT_INCOMPAT_FTYPE) 524 525 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 526 static inline bool 527 xfs_sb_has_incompat_feature( 528 struct xfs_sb *sbp, 529 __uint32_t feature) 530 { 531 return (sbp->sb_features_incompat & feature) != 0; 532 } 533 534 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 535 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 536 static inline bool 537 xfs_sb_has_incompat_log_feature( 538 struct xfs_sb *sbp, 539 __uint32_t feature) 540 { 541 return (sbp->sb_features_log_incompat & feature) != 0; 542 } 543 544 /* 545 * V5 superblock specific feature checks 546 */ 547 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 548 { 549 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 550 } 551 552 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 553 { 554 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 555 } 556 557 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 558 { 559 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 560 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 561 (xfs_sb_version_hasmorebits(sbp) && 562 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 563 } 564 565 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 566 { 567 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 568 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 569 } 570 571 /* 572 * end of superblock version macros 573 */ 574 575 static inline bool 576 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 577 { 578 return (ino == sbp->sb_uquotino || 579 ino == sbp->sb_gquotino || 580 ino == sbp->sb_pquotino); 581 } 582 583 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 584 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 585 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 586 587 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 588 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 589 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 590 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 591 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 592 593 /* 594 * File system sector to basic block conversions. 595 */ 596 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 597 598 /* 599 * File system block to basic block conversions. 600 */ 601 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 602 #define XFS_BB_TO_FSB(mp,bb) \ 603 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 604 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 605 606 /* 607 * File system block to byte conversions. 608 */ 609 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 610 #define XFS_B_TO_FSB(mp,b) \ 611 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 612 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 613 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 614 615 /* 616 * Allocation group header 617 * 618 * This is divided into three structures, placed in sequential 512-byte 619 * buffers after a copy of the superblock (also in a 512-byte buffer). 620 */ 621 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 622 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 623 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 624 #define XFS_AGF_VERSION 1 625 #define XFS_AGI_VERSION 1 626 627 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 628 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 629 630 /* 631 * Btree number 0 is bno, 1 is cnt. This value gives the size of the 632 * arrays below. 633 */ 634 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) 635 636 /* 637 * The second word of agf_levels in the first a.g. overlaps the EFS 638 * superblock's magic number. Since the magic numbers valid for EFS 639 * are > 64k, our value cannot be confused for an EFS superblock's. 640 */ 641 642 typedef struct xfs_agf { 643 /* 644 * Common allocation group header information 645 */ 646 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 647 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 648 __be32 agf_seqno; /* sequence # starting from 0 */ 649 __be32 agf_length; /* size in blocks of a.g. */ 650 /* 651 * Freespace information 652 */ 653 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 654 __be32 agf_spare0; /* spare field */ 655 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 656 __be32 agf_spare1; /* spare field */ 657 658 __be32 agf_flfirst; /* first freelist block's index */ 659 __be32 agf_fllast; /* last freelist block's index */ 660 __be32 agf_flcount; /* count of blocks in freelist */ 661 __be32 agf_freeblks; /* total free blocks */ 662 663 __be32 agf_longest; /* longest free space */ 664 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 665 uuid_t agf_uuid; /* uuid of filesystem */ 666 667 /* 668 * reserve some contiguous space for future logged fields before we add 669 * the unlogged fields. This makes the range logging via flags and 670 * structure offsets much simpler. 671 */ 672 __be64 agf_spare64[16]; 673 674 /* unlogged fields, written during buffer writeback. */ 675 __be64 agf_lsn; /* last write sequence */ 676 __be32 agf_crc; /* crc of agf sector */ 677 __be32 agf_spare2; 678 679 /* structure must be padded to 64 bit alignment */ 680 } xfs_agf_t; 681 682 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 683 684 #define XFS_AGF_MAGICNUM 0x00000001 685 #define XFS_AGF_VERSIONNUM 0x00000002 686 #define XFS_AGF_SEQNO 0x00000004 687 #define XFS_AGF_LENGTH 0x00000008 688 #define XFS_AGF_ROOTS 0x00000010 689 #define XFS_AGF_LEVELS 0x00000020 690 #define XFS_AGF_FLFIRST 0x00000040 691 #define XFS_AGF_FLLAST 0x00000080 692 #define XFS_AGF_FLCOUNT 0x00000100 693 #define XFS_AGF_FREEBLKS 0x00000200 694 #define XFS_AGF_LONGEST 0x00000400 695 #define XFS_AGF_BTREEBLKS 0x00000800 696 #define XFS_AGF_UUID 0x00001000 697 #define XFS_AGF_NUM_BITS 13 698 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 699 700 #define XFS_AGF_FLAGS \ 701 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 702 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 703 { XFS_AGF_SEQNO, "SEQNO" }, \ 704 { XFS_AGF_LENGTH, "LENGTH" }, \ 705 { XFS_AGF_ROOTS, "ROOTS" }, \ 706 { XFS_AGF_LEVELS, "LEVELS" }, \ 707 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 708 { XFS_AGF_FLLAST, "FLLAST" }, \ 709 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 710 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 711 { XFS_AGF_LONGEST, "LONGEST" }, \ 712 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 713 { XFS_AGF_UUID, "UUID" } 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 } xfs_agfl_t; 820 821 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 822 823 824 #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels) 825 #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \ 826 (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp))) 827 #define XFS_MIN_FREELIST(a,mp) \ 828 (XFS_MIN_FREELIST_RAW( \ 829 be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \ 830 be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp)) 831 #define XFS_MIN_FREELIST_PAG(pag,mp) \ 832 (XFS_MIN_FREELIST_RAW( \ 833 (unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \ 834 (unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)) 835 836 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 837 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 838 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 839 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 840 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 841 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 842 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 843 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 844 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 845 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 846 847 /* 848 * For checking for bad ranges of xfs_daddr_t's, covering multiple 849 * allocation groups or a single xfs_daddr_t that's a superblock copy. 850 */ 851 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 852 ((len) == 1 ? \ 853 ASSERT((d) == XFS_SB_DADDR || \ 854 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 855 ASSERT(xfs_daddr_to_agno(mp, d) == \ 856 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 857 858 typedef struct xfs_timestamp { 859 __be32 t_sec; /* timestamp seconds */ 860 __be32 t_nsec; /* timestamp nanoseconds */ 861 } xfs_timestamp_t; 862 863 /* 864 * On-disk inode structure. 865 * 866 * This is just the header or "dinode core", the inode is expanded to fill a 867 * variable size the leftover area split into a data and an attribute fork. 868 * The format of the data and attribute fork depends on the format of the 869 * inode as indicated by di_format and di_aformat. To access the data and 870 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 871 * below. 872 * 873 * There is a very similar struct icdinode in xfs_inode which matches the 874 * layout of the first 96 bytes of this structure, but is kept in native 875 * format instead of big endian. 876 * 877 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 878 * padding field for v3 inodes. 879 */ 880 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 881 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 882 typedef struct xfs_dinode { 883 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 884 __be16 di_mode; /* mode and type of file */ 885 __u8 di_version; /* inode version */ 886 __u8 di_format; /* format of di_c data */ 887 __be16 di_onlink; /* old number of links to file */ 888 __be32 di_uid; /* owner's user id */ 889 __be32 di_gid; /* owner's group id */ 890 __be32 di_nlink; /* number of links to file */ 891 __be16 di_projid_lo; /* lower part of owner's project id */ 892 __be16 di_projid_hi; /* higher part owner's project id */ 893 __u8 di_pad[6]; /* unused, zeroed space */ 894 __be16 di_flushiter; /* incremented on flush */ 895 xfs_timestamp_t di_atime; /* time last accessed */ 896 xfs_timestamp_t di_mtime; /* time last modified */ 897 xfs_timestamp_t di_ctime; /* time created/inode modified */ 898 __be64 di_size; /* number of bytes in file */ 899 __be64 di_nblocks; /* # of direct & btree blocks used */ 900 __be32 di_extsize; /* basic/minimum extent size for file */ 901 __be32 di_nextents; /* number of extents in data fork */ 902 __be16 di_anextents; /* number of extents in attribute fork*/ 903 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 904 __s8 di_aformat; /* format of attr fork's data */ 905 __be32 di_dmevmask; /* DMIG event mask */ 906 __be16 di_dmstate; /* DMIG state info */ 907 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 908 __be32 di_gen; /* generation number */ 909 910 /* di_next_unlinked is the only non-core field in the old dinode */ 911 __be32 di_next_unlinked;/* agi unlinked list ptr */ 912 913 /* start of the extended dinode, writable fields */ 914 __le32 di_crc; /* CRC of the inode */ 915 __be64 di_changecount; /* number of attribute changes */ 916 __be64 di_lsn; /* flush sequence */ 917 __be64 di_flags2; /* more random flags */ 918 __u8 di_pad2[16]; /* more padding for future expansion */ 919 920 /* fields only written to during inode creation */ 921 xfs_timestamp_t di_crtime; /* time created */ 922 __be64 di_ino; /* inode number */ 923 uuid_t di_uuid; /* UUID of the filesystem */ 924 925 /* structure must be padded to 64 bit alignment */ 926 } xfs_dinode_t; 927 928 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 929 930 #define DI_MAX_FLUSH 0xffff 931 932 /* 933 * Size of the core inode on disk. Version 1 and 2 inodes have 934 * the same size, but version 3 has grown a few additional fields. 935 */ 936 static inline uint xfs_dinode_size(int version) 937 { 938 if (version == 3) 939 return sizeof(struct xfs_dinode); 940 return offsetof(struct xfs_dinode, di_crc); 941 } 942 943 /* 944 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 945 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 946 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 947 */ 948 #define XFS_MAXLINK ((1U << 31) - 1U) 949 #define XFS_MAXLINK_1 65535U 950 951 /* 952 * Values for di_format 953 */ 954 typedef enum xfs_dinode_fmt { 955 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 956 XFS_DINODE_FMT_LOCAL, /* bulk data */ 957 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 958 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 959 XFS_DINODE_FMT_UUID /* uuid_t */ 960 } xfs_dinode_fmt_t; 961 962 /* 963 * Inode minimum and maximum sizes. 964 */ 965 #define XFS_DINODE_MIN_LOG 8 966 #define XFS_DINODE_MAX_LOG 11 967 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 968 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 969 970 /* 971 * Inode size for given fs. 972 */ 973 #define XFS_LITINO(mp, version) \ 974 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 975 976 /* 977 * Inode data & attribute fork sizes, per inode. 978 */ 979 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 980 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 981 982 #define XFS_DFORK_DSIZE(dip,mp) \ 983 (XFS_DFORK_Q(dip) ? \ 984 XFS_DFORK_BOFF(dip) : \ 985 XFS_LITINO(mp, (dip)->di_version)) 986 #define XFS_DFORK_ASIZE(dip,mp) \ 987 (XFS_DFORK_Q(dip) ? \ 988 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 989 0) 990 #define XFS_DFORK_SIZE(dip,mp,w) \ 991 ((w) == XFS_DATA_FORK ? \ 992 XFS_DFORK_DSIZE(dip, mp) : \ 993 XFS_DFORK_ASIZE(dip, mp)) 994 995 /* 996 * Return pointers to the data or attribute forks. 997 */ 998 #define XFS_DFORK_DPTR(dip) \ 999 ((char *)dip + xfs_dinode_size(dip->di_version)) 1000 #define XFS_DFORK_APTR(dip) \ 1001 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 1002 #define XFS_DFORK_PTR(dip,w) \ 1003 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 1004 1005 #define XFS_DFORK_FORMAT(dip,w) \ 1006 ((w) == XFS_DATA_FORK ? \ 1007 (dip)->di_format : \ 1008 (dip)->di_aformat) 1009 #define XFS_DFORK_NEXTENTS(dip,w) \ 1010 ((w) == XFS_DATA_FORK ? \ 1011 be32_to_cpu((dip)->di_nextents) : \ 1012 be16_to_cpu((dip)->di_anextents)) 1013 1014 /* 1015 * For block and character special files the 32bit dev_t is stored at the 1016 * beginning of the data fork. 1017 */ 1018 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 1019 { 1020 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 1021 } 1022 1023 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 1024 { 1025 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 1026 } 1027 1028 /* 1029 * Values for di_flags 1030 * There should be a one-to-one correspondence between these flags and the 1031 * XFS_XFLAG_s. 1032 */ 1033 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 1034 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 1035 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 1036 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 1037 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 1038 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 1039 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 1040 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 1041 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 1042 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 1043 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 1044 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 1045 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 1046 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 1047 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 1048 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 1049 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 1050 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1051 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1052 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1053 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1054 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1055 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1056 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1057 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1058 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1059 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1060 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1061 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1062 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1063 1064 #define XFS_DIFLAG_ANY \ 1065 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1066 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1067 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1068 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1069 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 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 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1282 { 1283 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1284 } 1285 1286 /* 1287 * Data record structure 1288 */ 1289 typedef struct xfs_inobt_rec { 1290 __be32 ir_startino; /* starting inode number */ 1291 __be32 ir_freecount; /* count of free inodes (set bits) */ 1292 __be64 ir_free; /* free inode mask */ 1293 } xfs_inobt_rec_t; 1294 1295 typedef struct xfs_inobt_rec_incore { 1296 xfs_agino_t ir_startino; /* starting inode number */ 1297 __int32_t ir_freecount; /* count of free inodes (set bits) */ 1298 xfs_inofree_t ir_free; /* free inode mask */ 1299 } xfs_inobt_rec_incore_t; 1300 1301 1302 /* 1303 * Key structure 1304 */ 1305 typedef struct xfs_inobt_key { 1306 __be32 ir_startino; /* starting inode number */ 1307 } xfs_inobt_key_t; 1308 1309 /* btree pointer type */ 1310 typedef __be32 xfs_inobt_ptr_t; 1311 1312 /* 1313 * block numbers in the AG. 1314 */ 1315 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1316 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1317 1318 /* 1319 * The first data block of an AG depends on whether the filesystem was formatted 1320 * with the finobt feature. If so, account for the finobt reserved root btree 1321 * block. 1322 */ 1323 #define XFS_PREALLOC_BLOCKS(mp) \ 1324 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1325 XFS_FIBT_BLOCK(mp) + 1 : \ 1326 XFS_IBT_BLOCK(mp) + 1) 1327 1328 1329 1330 /* 1331 * BMAP Btree format definitions 1332 * 1333 * This includes both the root block definition that sits inside an inode fork 1334 * and the record/pointer formats for the leaf/node in the blocks. 1335 */ 1336 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1337 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1338 1339 /* 1340 * Bmap root header, on-disk form only. 1341 */ 1342 typedef struct xfs_bmdr_block { 1343 __be16 bb_level; /* 0 is a leaf */ 1344 __be16 bb_numrecs; /* current # of data records */ 1345 } xfs_bmdr_block_t; 1346 1347 /* 1348 * Bmap btree record and extent descriptor. 1349 * l0:63 is an extent flag (value 1 indicates non-normal). 1350 * l0:9-62 are startoff. 1351 * l0:0-8 and l1:21-63 are startblock. 1352 * l1:0-20 are blockcount. 1353 */ 1354 #define BMBT_EXNTFLAG_BITLEN 1 1355 #define BMBT_STARTOFF_BITLEN 54 1356 #define BMBT_STARTBLOCK_BITLEN 52 1357 #define BMBT_BLOCKCOUNT_BITLEN 21 1358 1359 typedef struct xfs_bmbt_rec { 1360 __be64 l0, l1; 1361 } xfs_bmbt_rec_t; 1362 1363 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1364 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1365 1366 typedef struct xfs_bmbt_rec_host { 1367 __uint64_t l0, l1; 1368 } xfs_bmbt_rec_host_t; 1369 1370 /* 1371 * Values and macros for delayed-allocation startblock fields. 1372 */ 1373 #define STARTBLOCKVALBITS 17 1374 #define STARTBLOCKMASKBITS (15 + 20) 1375 #define STARTBLOCKMASK \ 1376 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1377 1378 static inline int isnullstartblock(xfs_fsblock_t x) 1379 { 1380 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1381 } 1382 1383 static inline xfs_fsblock_t nullstartblock(int k) 1384 { 1385 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1386 return STARTBLOCKMASK | (k); 1387 } 1388 1389 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1390 { 1391 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1392 } 1393 1394 /* 1395 * Possible extent formats. 1396 */ 1397 typedef enum { 1398 XFS_EXTFMT_NOSTATE = 0, 1399 XFS_EXTFMT_HASSTATE 1400 } xfs_exntfmt_t; 1401 1402 /* 1403 * Possible extent states. 1404 */ 1405 typedef enum { 1406 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1407 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1408 } xfs_exntst_t; 1409 1410 /* 1411 * Incore version of above. 1412 */ 1413 typedef struct xfs_bmbt_irec 1414 { 1415 xfs_fileoff_t br_startoff; /* starting file offset */ 1416 xfs_fsblock_t br_startblock; /* starting block number */ 1417 xfs_filblks_t br_blockcount; /* number of blocks */ 1418 xfs_exntst_t br_state; /* extent state */ 1419 } xfs_bmbt_irec_t; 1420 1421 /* 1422 * Key structure for non-leaf levels of the tree. 1423 */ 1424 typedef struct xfs_bmbt_key { 1425 __be64 br_startoff; /* starting file offset */ 1426 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1427 1428 /* btree pointer type */ 1429 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1430 1431 1432 /* 1433 * Generic Btree block format definitions 1434 * 1435 * This is a combination of the actual format used on disk for short and long 1436 * format btrees. The first three fields are shared by both format, but the 1437 * pointers are different and should be used with care. 1438 * 1439 * To get the size of the actual short or long form headers please use the size 1440 * macros below. Never use sizeof(xfs_btree_block). 1441 * 1442 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1443 * with the crc feature bit, and all accesses to them must be conditional on 1444 * that flag. 1445 */ 1446 struct xfs_btree_block { 1447 __be32 bb_magic; /* magic number for block type */ 1448 __be16 bb_level; /* 0 is a leaf */ 1449 __be16 bb_numrecs; /* current # of data records */ 1450 union { 1451 struct { 1452 __be32 bb_leftsib; 1453 __be32 bb_rightsib; 1454 1455 __be64 bb_blkno; 1456 __be64 bb_lsn; 1457 uuid_t bb_uuid; 1458 __be32 bb_owner; 1459 __le32 bb_crc; 1460 } s; /* short form pointers */ 1461 struct { 1462 __be64 bb_leftsib; 1463 __be64 bb_rightsib; 1464 1465 __be64 bb_blkno; 1466 __be64 bb_lsn; 1467 uuid_t bb_uuid; 1468 __be64 bb_owner; 1469 __le32 bb_crc; 1470 __be32 bb_pad; /* padding for alignment */ 1471 } l; /* long form pointers */ 1472 } bb_u; /* rest */ 1473 }; 1474 1475 #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ 1476 #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ 1477 1478 /* sizes of CRC enabled btree blocks */ 1479 #define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) 1480 #define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) 1481 1482 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1483 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1484 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1485 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1486 1487 /* 1488 * On-disk XFS access control list structure. 1489 */ 1490 struct xfs_acl_entry { 1491 __be32 ae_tag; 1492 __be32 ae_id; 1493 __be16 ae_perm; 1494 __be16 ae_pad; /* fill the implicit hole in the structure */ 1495 }; 1496 1497 struct xfs_acl { 1498 __be32 acl_cnt; 1499 struct xfs_acl_entry acl_entry[0]; 1500 }; 1501 1502 /* 1503 * The number of ACL entries allowed is defined by the on-disk format. 1504 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1505 * limited only by the maximum size of the xattr that stores the information. 1506 */ 1507 #define XFS_ACL_MAX_ENTRIES(mp) \ 1508 (xfs_sb_version_hascrc(&mp->m_sb) \ 1509 ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1510 sizeof(struct xfs_acl_entry) \ 1511 : 25) 1512 1513 #define XFS_ACL_MAX_SIZE(mp) \ 1514 (sizeof(struct xfs_acl) + \ 1515 sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp))) 1516 1517 /* On-disk XFS extended attribute names */ 1518 #define SGI_ACL_FILE (unsigned char *)"SGI_ACL_FILE" 1519 #define SGI_ACL_DEFAULT (unsigned char *)"SGI_ACL_DEFAULT" 1520 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1521 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1522 1523 #endif /* __XFS_FORMAT_H__ */ 1524