1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_log_format.h" 11 #include "xfs_trans_resv.h" 12 #include "xfs_bit.h" 13 #include "xfs_sb.h" 14 #include "xfs_mount.h" 15 #include "xfs_ialloc.h" 16 #include "xfs_alloc.h" 17 #include "xfs_error.h" 18 #include "xfs_trans.h" 19 #include "xfs_buf_item.h" 20 #include "xfs_bmap_btree.h" 21 #include "xfs_alloc_btree.h" 22 #include "xfs_log.h" 23 #include "xfs_rmap_btree.h" 24 #include "xfs_refcount_btree.h" 25 #include "xfs_da_format.h" 26 #include "xfs_health.h" 27 #include "xfs_ag.h" 28 #include "xfs_rtbitmap.h" 29 30 /* 31 * Physical superblock buffer manipulations. Shared with libxfs in userspace. 32 */ 33 34 /* 35 * Check that all the V4 feature bits that the V5 filesystem format requires are 36 * correctly set. 37 */ 38 static bool 39 xfs_sb_validate_v5_features( 40 struct xfs_sb *sbp) 41 { 42 /* We must not have any unknown V4 feature bits set */ 43 if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) 44 return false; 45 46 /* 47 * The CRC bit is considered an invalid V4 flag, so we have to add it 48 * manually to the OKBITS mask. 49 */ 50 if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS | 51 XFS_SB_VERSION2_CRCBIT)) 52 return false; 53 54 /* Now check all the required V4 feature flags are set. */ 55 56 #define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \ 57 XFS_SB_VERSION_ALIGNBIT | \ 58 XFS_SB_VERSION_LOGV2BIT | \ 59 XFS_SB_VERSION_EXTFLGBIT | \ 60 XFS_SB_VERSION_DIRV2BIT | \ 61 XFS_SB_VERSION_MOREBITSBIT) 62 63 #define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 64 XFS_SB_VERSION2_ATTR2BIT | \ 65 XFS_SB_VERSION2_PROJID32BIT | \ 66 XFS_SB_VERSION2_CRCBIT) 67 68 if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS) 69 return false; 70 if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS) 71 return false; 72 return true; 73 } 74 75 /* 76 * We current support XFS v5 formats with known features and v4 superblocks with 77 * at least V2 directories. 78 */ 79 bool 80 xfs_sb_good_version( 81 struct xfs_sb *sbp) 82 { 83 /* 84 * All v5 filesystems are supported, but we must check that all the 85 * required v4 feature flags are enabled correctly as the code checks 86 * those flags and not for v5 support. 87 */ 88 if (xfs_sb_is_v5(sbp)) 89 return xfs_sb_validate_v5_features(sbp); 90 91 /* versions prior to v4 are not supported */ 92 if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4) 93 return false; 94 95 /* We must not have any unknown v4 feature bits set */ 96 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 97 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 98 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 99 return false; 100 101 /* V4 filesystems need v2 directories and unwritten extents */ 102 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 103 return false; 104 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)) 105 return false; 106 107 /* It's a supported v4 filesystem */ 108 return true; 109 } 110 111 uint64_t 112 xfs_sb_version_to_features( 113 struct xfs_sb *sbp) 114 { 115 uint64_t features = 0; 116 117 /* optional V4 features */ 118 if (sbp->sb_rblocks > 0) 119 features |= XFS_FEAT_REALTIME; 120 if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT) 121 features |= XFS_FEAT_NLINK; 122 if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT) 123 features |= XFS_FEAT_ATTR; 124 if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT) 125 features |= XFS_FEAT_QUOTA; 126 if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT) 127 features |= XFS_FEAT_ALIGN; 128 if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT) 129 features |= XFS_FEAT_LOGV2; 130 if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT) 131 features |= XFS_FEAT_DALIGN; 132 if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT) 133 features |= XFS_FEAT_EXTFLG; 134 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) 135 features |= XFS_FEAT_SECTOR; 136 if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT) 137 features |= XFS_FEAT_ASCIICI; 138 if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) { 139 if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT) 140 features |= XFS_FEAT_LAZYSBCOUNT; 141 if (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT) 142 features |= XFS_FEAT_ATTR2; 143 if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT) 144 features |= XFS_FEAT_PROJID32; 145 if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE) 146 features |= XFS_FEAT_FTYPE; 147 } 148 149 if (!xfs_sb_is_v5(sbp)) 150 return features; 151 152 /* Always on V5 features */ 153 features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG | 154 XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_ATTR2 | XFS_FEAT_PROJID32 | 155 XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO; 156 157 /* Optional V5 features */ 158 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT) 159 features |= XFS_FEAT_FINOBT; 160 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT) 161 features |= XFS_FEAT_RMAPBT; 162 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK) 163 features |= XFS_FEAT_REFLINK; 164 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT) 165 features |= XFS_FEAT_INOBTCNT; 166 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) 167 features |= XFS_FEAT_FTYPE; 168 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) 169 features |= XFS_FEAT_SPINODES; 170 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 171 features |= XFS_FEAT_META_UUID; 172 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME) 173 features |= XFS_FEAT_BIGTIME; 174 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR) 175 features |= XFS_FEAT_NEEDSREPAIR; 176 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64) 177 features |= XFS_FEAT_NREXT64; 178 179 return features; 180 } 181 182 /* Check all the superblock fields we care about when reading one in. */ 183 STATIC int 184 xfs_validate_sb_read( 185 struct xfs_mount *mp, 186 struct xfs_sb *sbp) 187 { 188 if (!xfs_sb_is_v5(sbp)) 189 return 0; 190 191 /* 192 * Version 5 superblock feature mask validation. Reject combinations 193 * the kernel cannot support up front before checking anything else. 194 */ 195 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { 196 xfs_warn(mp, 197 "Superblock has unknown compatible features (0x%x) enabled.", 198 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); 199 xfs_warn(mp, 200 "Using a more recent kernel is recommended."); 201 } 202 203 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 204 xfs_alert(mp, 205 "Superblock has unknown read-only compatible features (0x%x) enabled.", 206 (sbp->sb_features_ro_compat & 207 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 208 if (!xfs_is_readonly(mp)) { 209 xfs_warn(mp, 210 "Attempted to mount read-only compatible filesystem read-write."); 211 xfs_warn(mp, 212 "Filesystem can only be safely mounted read only."); 213 214 return -EINVAL; 215 } 216 } 217 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 218 xfs_warn(mp, 219 "Superblock has unknown incompatible features (0x%x) enabled.", 220 (sbp->sb_features_incompat & 221 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 222 xfs_warn(mp, 223 "Filesystem cannot be safely mounted by this kernel."); 224 return -EINVAL; 225 } 226 227 return 0; 228 } 229 230 /* Check all the superblock fields we care about when writing one out. */ 231 STATIC int 232 xfs_validate_sb_write( 233 struct xfs_mount *mp, 234 struct xfs_buf *bp, 235 struct xfs_sb *sbp) 236 { 237 /* 238 * Carry out additional sb summary counter sanity checks when we write 239 * the superblock. We skip this in the read validator because there 240 * could be newer superblocks in the log and if the values are garbage 241 * even after replay we'll recalculate them at the end of log mount. 242 * 243 * mkfs has traditionally written zeroed counters to inprogress and 244 * secondary superblocks, so allow this usage to continue because 245 * we never read counters from such superblocks. 246 */ 247 if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress && 248 (sbp->sb_fdblocks > sbp->sb_dblocks || 249 !xfs_verify_icount(mp, sbp->sb_icount) || 250 sbp->sb_ifree > sbp->sb_icount)) { 251 xfs_warn(mp, "SB summary counter sanity check failed"); 252 return -EFSCORRUPTED; 253 } 254 255 if (!xfs_sb_is_v5(sbp)) 256 return 0; 257 258 /* 259 * Version 5 superblock feature mask validation. Reject combinations 260 * the kernel cannot support since we checked for unsupported bits in 261 * the read verifier, which means that memory is corrupt. 262 */ 263 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { 264 xfs_warn(mp, 265 "Corruption detected in superblock compatible features (0x%x)!", 266 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); 267 return -EFSCORRUPTED; 268 } 269 270 if (!xfs_is_readonly(mp) && 271 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 272 xfs_alert(mp, 273 "Corruption detected in superblock read-only compatible features (0x%x)!", 274 (sbp->sb_features_ro_compat & 275 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 276 return -EFSCORRUPTED; 277 } 278 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 279 xfs_warn(mp, 280 "Corruption detected in superblock incompatible features (0x%x)!", 281 (sbp->sb_features_incompat & 282 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 283 return -EFSCORRUPTED; 284 } 285 if (xfs_sb_has_incompat_log_feature(sbp, 286 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) { 287 xfs_warn(mp, 288 "Corruption detected in superblock incompatible log features (0x%x)!", 289 (sbp->sb_features_log_incompat & 290 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)); 291 return -EFSCORRUPTED; 292 } 293 294 /* 295 * We can't read verify the sb LSN because the read verifier is called 296 * before the log is allocated and processed. We know the log is set up 297 * before write verifier calls, so check it here. 298 */ 299 if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) 300 return -EFSCORRUPTED; 301 302 return 0; 303 } 304 305 /* Check the validity of the SB. */ 306 STATIC int 307 xfs_validate_sb_common( 308 struct xfs_mount *mp, 309 struct xfs_buf *bp, 310 struct xfs_sb *sbp) 311 { 312 struct xfs_dsb *dsb = bp->b_addr; 313 uint32_t agcount = 0; 314 uint32_t rem; 315 bool has_dalign; 316 317 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) { 318 xfs_warn(mp, 319 "Superblock has bad magic number 0x%x. Not an XFS filesystem?", 320 be32_to_cpu(dsb->sb_magicnum)); 321 return -EWRONGFS; 322 } 323 324 if (!xfs_sb_good_version(sbp)) { 325 xfs_warn(mp, 326 "Superblock has unknown features enabled or corrupted feature masks."); 327 return -EWRONGFS; 328 } 329 330 /* 331 * Validate feature flags and state 332 */ 333 if (xfs_sb_is_v5(sbp)) { 334 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) { 335 xfs_notice(mp, 336 "Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)", 337 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE); 338 return -EFSCORRUPTED; 339 } 340 341 /* V5 has a separate project quota inode */ 342 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 343 xfs_notice(mp, 344 "Version 5 of Super block has XFS_OQUOTA bits."); 345 return -EFSCORRUPTED; 346 } 347 348 /* 349 * Full inode chunks must be aligned to inode chunk size when 350 * sparse inodes are enabled to support the sparse chunk 351 * allocation algorithm and prevent overlapping inode records. 352 */ 353 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) { 354 uint32_t align; 355 356 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize 357 >> sbp->sb_blocklog; 358 if (sbp->sb_inoalignmt != align) { 359 xfs_warn(mp, 360 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", 361 sbp->sb_inoalignmt, align); 362 return -EINVAL; 363 } 364 } 365 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 366 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 367 xfs_notice(mp, 368 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits."); 369 return -EFSCORRUPTED; 370 } 371 372 if (unlikely( 373 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 374 xfs_warn(mp, 375 "filesystem is marked as having an external log; " 376 "specify logdev on the mount command line."); 377 return -EINVAL; 378 } 379 380 if (unlikely( 381 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 382 xfs_warn(mp, 383 "filesystem is marked as having an internal log; " 384 "do not specify logdev on the mount command line."); 385 return -EINVAL; 386 } 387 388 /* Compute agcount for this number of dblocks and agblocks */ 389 if (sbp->sb_agblocks) { 390 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem); 391 if (rem) 392 agcount++; 393 } 394 395 /* 396 * More sanity checking. Most of these were stolen directly from 397 * xfs_repair. 398 */ 399 if (unlikely( 400 sbp->sb_agcount <= 0 || 401 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 402 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 403 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 404 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 405 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 406 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 407 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 408 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 409 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 410 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 411 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 412 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 413 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 414 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 415 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 416 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 417 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 418 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES || 419 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES || 420 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 || 421 agcount == 0 || agcount != sbp->sb_agcount || 422 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 423 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 424 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 425 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 426 sbp->sb_dblocks == 0 || 427 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 428 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 429 sbp->sb_shared_vn != 0)) { 430 xfs_notice(mp, "SB sanity check failed"); 431 return -EFSCORRUPTED; 432 } 433 434 /* 435 * Logs that are too large are not supported at all. Reject them 436 * outright. Logs that are too small are tolerated on v4 filesystems, 437 * but we can only check that when mounting the log. Hence we skip 438 * those checks here. 439 */ 440 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) { 441 xfs_notice(mp, 442 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks", 443 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS); 444 return -EFSCORRUPTED; 445 } 446 447 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) { 448 xfs_warn(mp, 449 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes", 450 XFS_FSB_TO_B(mp, sbp->sb_logblocks), 451 XFS_MAX_LOG_BYTES); 452 return -EFSCORRUPTED; 453 } 454 455 /* 456 * Do not allow filesystems with corrupted log sector or stripe units to 457 * be mounted. We cannot safely size the iclogs or write to the log if 458 * the log stripe unit is not valid. 459 */ 460 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) { 461 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) { 462 xfs_notice(mp, 463 "log sector size in bytes/log2 (0x%x/0x%x) must match", 464 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog); 465 return -EFSCORRUPTED; 466 } 467 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) { 468 xfs_notice(mp, 469 "log sector size in bytes/log2 (0x%x/0x%x) are not zero", 470 sbp->sb_logsectsize, sbp->sb_logsectlog); 471 return -EFSCORRUPTED; 472 } 473 474 if (sbp->sb_logsunit > 1) { 475 if (sbp->sb_logsunit % sbp->sb_blocksize) { 476 xfs_notice(mp, 477 "log stripe unit 0x%x bytes must be a multiple of block size", 478 sbp->sb_logsunit); 479 return -EFSCORRUPTED; 480 } 481 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) { 482 xfs_notice(mp, 483 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)", 484 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE); 485 return -EFSCORRUPTED; 486 } 487 } 488 489 /* Validate the realtime geometry; stolen from xfs_repair */ 490 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE || 491 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) { 492 xfs_notice(mp, 493 "realtime extent sanity check failed"); 494 return -EFSCORRUPTED; 495 } 496 497 if (sbp->sb_rblocks == 0) { 498 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 || 499 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) { 500 xfs_notice(mp, 501 "realtime zeroed geometry check failed"); 502 return -EFSCORRUPTED; 503 } 504 } else { 505 uint64_t rexts; 506 uint64_t rbmblocks; 507 508 rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize); 509 rbmblocks = howmany_64(sbp->sb_rextents, 510 NBBY * sbp->sb_blocksize); 511 512 if (!xfs_validate_rtextents(rexts) || 513 sbp->sb_rextents != rexts || 514 sbp->sb_rextslog != xfs_compute_rextslog(rexts) || 515 sbp->sb_rbmblocks != rbmblocks) { 516 xfs_notice(mp, 517 "realtime geometry sanity check failed"); 518 return -EFSCORRUPTED; 519 } 520 } 521 522 /* 523 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign) 524 * would imply the image is corrupted. 525 */ 526 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT; 527 if (!!sbp->sb_unit ^ has_dalign) { 528 xfs_notice(mp, "SB stripe alignment sanity check failed"); 529 return -EFSCORRUPTED; 530 } 531 532 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit), 533 XFS_FSB_TO_B(mp, sbp->sb_width), 0, false)) 534 return -EFSCORRUPTED; 535 536 /* 537 * Currently only very few inode sizes are supported. 538 */ 539 switch (sbp->sb_inodesize) { 540 case 256: 541 case 512: 542 case 1024: 543 case 2048: 544 break; 545 default: 546 xfs_warn(mp, "inode size of %d bytes not supported", 547 sbp->sb_inodesize); 548 return -ENOSYS; 549 } 550 551 return 0; 552 } 553 554 void 555 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 556 { 557 /* 558 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 559 * leads to in-core values having two different values for a quota 560 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 561 * NULLFSINO. 562 * 563 * Note that this change affect only the in-core values. These 564 * values are not written back to disk unless any quota information 565 * is written to the disk. Even in that case, sb_pquotino field is 566 * not written to disk unless the superblock supports pquotino. 567 */ 568 if (sbp->sb_uquotino == 0) 569 sbp->sb_uquotino = NULLFSINO; 570 if (sbp->sb_gquotino == 0) 571 sbp->sb_gquotino = NULLFSINO; 572 if (sbp->sb_pquotino == 0) 573 sbp->sb_pquotino = NULLFSINO; 574 575 /* 576 * We need to do these manipilations only if we are working 577 * with an older version of on-disk superblock. 578 */ 579 if (xfs_sb_is_v5(sbp)) 580 return; 581 582 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 583 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 584 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 585 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 586 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 587 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 588 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 589 590 if (sbp->sb_qflags & XFS_PQUOTA_ACCT && 591 sbp->sb_gquotino != NULLFSINO) { 592 /* 593 * In older version of superblock, on-disk superblock only 594 * has sb_gquotino, and in-core superblock has both sb_gquotino 595 * and sb_pquotino. But, only one of them is supported at any 596 * point of time. So, if PQUOTA is set in disk superblock, 597 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test 598 * above is to make sure we don't do this twice and wipe them 599 * both out! 600 */ 601 sbp->sb_pquotino = sbp->sb_gquotino; 602 sbp->sb_gquotino = NULLFSINO; 603 } 604 } 605 606 static void 607 __xfs_sb_from_disk( 608 struct xfs_sb *to, 609 struct xfs_dsb *from, 610 bool convert_xquota) 611 { 612 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 613 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 614 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 615 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 616 to->sb_rextents = be64_to_cpu(from->sb_rextents); 617 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 618 to->sb_logstart = be64_to_cpu(from->sb_logstart); 619 to->sb_rootino = be64_to_cpu(from->sb_rootino); 620 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 621 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 622 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 623 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 624 to->sb_agcount = be32_to_cpu(from->sb_agcount); 625 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 626 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 627 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 628 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 629 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 630 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 631 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 632 to->sb_blocklog = from->sb_blocklog; 633 to->sb_sectlog = from->sb_sectlog; 634 to->sb_inodelog = from->sb_inodelog; 635 to->sb_inopblog = from->sb_inopblog; 636 to->sb_agblklog = from->sb_agblklog; 637 to->sb_rextslog = from->sb_rextslog; 638 to->sb_inprogress = from->sb_inprogress; 639 to->sb_imax_pct = from->sb_imax_pct; 640 to->sb_icount = be64_to_cpu(from->sb_icount); 641 to->sb_ifree = be64_to_cpu(from->sb_ifree); 642 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 643 to->sb_frextents = be64_to_cpu(from->sb_frextents); 644 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 645 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 646 to->sb_qflags = be16_to_cpu(from->sb_qflags); 647 to->sb_flags = from->sb_flags; 648 to->sb_shared_vn = from->sb_shared_vn; 649 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 650 to->sb_unit = be32_to_cpu(from->sb_unit); 651 to->sb_width = be32_to_cpu(from->sb_width); 652 to->sb_dirblklog = from->sb_dirblklog; 653 to->sb_logsectlog = from->sb_logsectlog; 654 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 655 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 656 to->sb_features2 = be32_to_cpu(from->sb_features2); 657 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 658 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 659 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 660 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 661 to->sb_features_log_incompat = 662 be32_to_cpu(from->sb_features_log_incompat); 663 /* crc is only used on disk, not in memory; just init to 0 here. */ 664 to->sb_crc = 0; 665 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 666 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 667 to->sb_lsn = be64_to_cpu(from->sb_lsn); 668 /* 669 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 670 * feature flag is set; if not set we keep it only in memory. 671 */ 672 if (xfs_sb_is_v5(to) && 673 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)) 674 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 675 else 676 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 677 /* Convert on-disk flags to in-memory flags? */ 678 if (convert_xquota) 679 xfs_sb_quota_from_disk(to); 680 } 681 682 void 683 xfs_sb_from_disk( 684 struct xfs_sb *to, 685 struct xfs_dsb *from) 686 { 687 __xfs_sb_from_disk(to, from, true); 688 } 689 690 static void 691 xfs_sb_quota_to_disk( 692 struct xfs_dsb *to, 693 struct xfs_sb *from) 694 { 695 uint16_t qflags = from->sb_qflags; 696 697 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 698 699 /* 700 * The in-memory superblock quota state matches the v5 on-disk format so 701 * just write them out and return 702 */ 703 if (xfs_sb_is_v5(from)) { 704 to->sb_qflags = cpu_to_be16(from->sb_qflags); 705 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 706 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 707 return; 708 } 709 710 /* 711 * For older superblocks (v4), the in-core version of sb_qflags do not 712 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So, 713 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 714 */ 715 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 716 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 717 718 if (from->sb_qflags & 719 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 720 qflags |= XFS_OQUOTA_ENFD; 721 if (from->sb_qflags & 722 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 723 qflags |= XFS_OQUOTA_CHKD; 724 to->sb_qflags = cpu_to_be16(qflags); 725 726 /* 727 * GQUOTINO and PQUOTINO cannot be used together in versions 728 * of superblock that do not have pquotino. from->sb_flags 729 * tells us which quota is active and should be copied to 730 * disk. If neither are active, we should NULL the inode. 731 * 732 * In all cases, the separate pquotino must remain 0 because it 733 * is beyond the "end" of the valid non-pquotino superblock. 734 */ 735 if (from->sb_qflags & XFS_GQUOTA_ACCT) 736 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 737 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 738 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 739 else { 740 /* 741 * We can't rely on just the fields being logged to tell us 742 * that it is safe to write NULLFSINO - we should only do that 743 * if quotas are not actually enabled. Hence only write 744 * NULLFSINO if both in-core quota inodes are NULL. 745 */ 746 if (from->sb_gquotino == NULLFSINO && 747 from->sb_pquotino == NULLFSINO) 748 to->sb_gquotino = cpu_to_be64(NULLFSINO); 749 } 750 751 to->sb_pquotino = 0; 752 } 753 754 void 755 xfs_sb_to_disk( 756 struct xfs_dsb *to, 757 struct xfs_sb *from) 758 { 759 xfs_sb_quota_to_disk(to, from); 760 761 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 762 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 763 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 764 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 765 to->sb_rextents = cpu_to_be64(from->sb_rextents); 766 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 767 to->sb_logstart = cpu_to_be64(from->sb_logstart); 768 to->sb_rootino = cpu_to_be64(from->sb_rootino); 769 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 770 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 771 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 772 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 773 to->sb_agcount = cpu_to_be32(from->sb_agcount); 774 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 775 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 776 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 777 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 778 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 779 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 780 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 781 to->sb_blocklog = from->sb_blocklog; 782 to->sb_sectlog = from->sb_sectlog; 783 to->sb_inodelog = from->sb_inodelog; 784 to->sb_inopblog = from->sb_inopblog; 785 to->sb_agblklog = from->sb_agblklog; 786 to->sb_rextslog = from->sb_rextslog; 787 to->sb_inprogress = from->sb_inprogress; 788 to->sb_imax_pct = from->sb_imax_pct; 789 to->sb_icount = cpu_to_be64(from->sb_icount); 790 to->sb_ifree = cpu_to_be64(from->sb_ifree); 791 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 792 to->sb_frextents = cpu_to_be64(from->sb_frextents); 793 794 to->sb_flags = from->sb_flags; 795 to->sb_shared_vn = from->sb_shared_vn; 796 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 797 to->sb_unit = cpu_to_be32(from->sb_unit); 798 to->sb_width = cpu_to_be32(from->sb_width); 799 to->sb_dirblklog = from->sb_dirblklog; 800 to->sb_logsectlog = from->sb_logsectlog; 801 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 802 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 803 804 /* 805 * We need to ensure that bad_features2 always matches features2. 806 * Hence we enforce that here rather than having to remember to do it 807 * everywhere else that updates features2. 808 */ 809 from->sb_bad_features2 = from->sb_features2; 810 to->sb_features2 = cpu_to_be32(from->sb_features2); 811 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 812 813 if (!xfs_sb_is_v5(from)) 814 return; 815 816 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 817 to->sb_features_ro_compat = 818 cpu_to_be32(from->sb_features_ro_compat); 819 to->sb_features_incompat = 820 cpu_to_be32(from->sb_features_incompat); 821 to->sb_features_log_incompat = 822 cpu_to_be32(from->sb_features_log_incompat); 823 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 824 to->sb_lsn = cpu_to_be64(from->sb_lsn); 825 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 826 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 827 } 828 829 /* 830 * If the superblock has the CRC feature bit set or the CRC field is non-null, 831 * check that the CRC is valid. We check the CRC field is non-null because a 832 * single bit error could clear the feature bit and unused parts of the 833 * superblock are supposed to be zero. Hence a non-null crc field indicates that 834 * we've potentially lost a feature bit and we should check it anyway. 835 * 836 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 837 * last field in V4 secondary superblocks. So for secondary superblocks, 838 * we are more forgiving, and ignore CRC failures if the primary doesn't 839 * indicate that the fs version is V5. 840 */ 841 static void 842 xfs_sb_read_verify( 843 struct xfs_buf *bp) 844 { 845 struct xfs_sb sb; 846 struct xfs_mount *mp = bp->b_mount; 847 struct xfs_dsb *dsb = bp->b_addr; 848 int error; 849 850 /* 851 * open code the version check to avoid needing to convert the entire 852 * superblock from disk order just to check the version number 853 */ 854 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 855 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 856 XFS_SB_VERSION_5) || 857 dsb->sb_crc != 0)) { 858 859 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 860 /* Only fail bad secondaries on a known V5 filesystem */ 861 if (xfs_buf_daddr(bp) == XFS_SB_DADDR || 862 xfs_has_crc(mp)) { 863 error = -EFSBADCRC; 864 goto out_error; 865 } 866 } 867 } 868 869 /* 870 * Check all the superblock fields. Don't byteswap the xquota flags 871 * because _verify_common checks the on-disk values. 872 */ 873 __xfs_sb_from_disk(&sb, dsb, false); 874 error = xfs_validate_sb_common(mp, bp, &sb); 875 if (error) 876 goto out_error; 877 error = xfs_validate_sb_read(mp, &sb); 878 879 out_error: 880 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 881 xfs_verifier_error(bp, error, __this_address); 882 else if (error) 883 xfs_buf_ioerror(bp, error); 884 } 885 886 /* 887 * We may be probed for a filesystem match, so we may not want to emit 888 * messages when the superblock buffer is not actually an XFS superblock. 889 * If we find an XFS superblock, then run a normal, noisy mount because we are 890 * really going to mount it and want to know about errors. 891 */ 892 static void 893 xfs_sb_quiet_read_verify( 894 struct xfs_buf *bp) 895 { 896 struct xfs_dsb *dsb = bp->b_addr; 897 898 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 899 /* XFS filesystem, verify noisily! */ 900 xfs_sb_read_verify(bp); 901 return; 902 } 903 /* quietly fail */ 904 xfs_buf_ioerror(bp, -EWRONGFS); 905 } 906 907 static void 908 xfs_sb_write_verify( 909 struct xfs_buf *bp) 910 { 911 struct xfs_sb sb; 912 struct xfs_mount *mp = bp->b_mount; 913 struct xfs_buf_log_item *bip = bp->b_log_item; 914 struct xfs_dsb *dsb = bp->b_addr; 915 int error; 916 917 /* 918 * Check all the superblock fields. Don't byteswap the xquota flags 919 * because _verify_common checks the on-disk values. 920 */ 921 __xfs_sb_from_disk(&sb, dsb, false); 922 error = xfs_validate_sb_common(mp, bp, &sb); 923 if (error) 924 goto out_error; 925 error = xfs_validate_sb_write(mp, bp, &sb); 926 if (error) 927 goto out_error; 928 929 if (!xfs_sb_is_v5(&sb)) 930 return; 931 932 if (bip) 933 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 934 935 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 936 return; 937 938 out_error: 939 xfs_verifier_error(bp, error, __this_address); 940 } 941 942 const struct xfs_buf_ops xfs_sb_buf_ops = { 943 .name = "xfs_sb", 944 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 945 .verify_read = xfs_sb_read_verify, 946 .verify_write = xfs_sb_write_verify, 947 }; 948 949 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 950 .name = "xfs_sb_quiet", 951 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 952 .verify_read = xfs_sb_quiet_read_verify, 953 .verify_write = xfs_sb_write_verify, 954 }; 955 956 /* 957 * xfs_mount_common 958 * 959 * Mount initialization code establishing various mount 960 * fields from the superblock associated with the given 961 * mount structure. 962 * 963 * Inode geometry are calculated in xfs_ialloc_setup_geometry. 964 */ 965 void 966 xfs_sb_mount_common( 967 struct xfs_mount *mp, 968 struct xfs_sb *sbp) 969 { 970 mp->m_agfrotor = 0; 971 atomic_set(&mp->m_agirotor, 0); 972 mp->m_maxagi = mp->m_sb.sb_agcount; 973 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 974 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 975 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 976 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 977 mp->m_blockmask = sbp->sb_blocksize - 1; 978 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 979 mp->m_blockwmask = mp->m_blockwsize - 1; 980 981 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 982 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 983 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 984 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 985 986 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 987 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 988 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 989 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 990 991 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1); 992 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0); 993 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 994 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 995 996 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true); 997 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false); 998 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; 999 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; 1000 1001 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 1002 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 1003 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 1004 } 1005 1006 /* 1007 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 1008 * into the superblock buffer to be logged. It does not provide the higher 1009 * level of locking that is needed to protect the in-core superblock from 1010 * concurrent access. 1011 */ 1012 void 1013 xfs_log_sb( 1014 struct xfs_trans *tp) 1015 { 1016 struct xfs_mount *mp = tp->t_mountp; 1017 struct xfs_buf *bp = xfs_trans_getsb(tp); 1018 1019 /* 1020 * Lazy sb counters don't update the in-core superblock so do that now. 1021 * If this is at unmount, the counters will be exactly correct, but at 1022 * any other time they will only be ballpark correct because of 1023 * reservations that have been taken out percpu counters. If we have an 1024 * unclean shutdown, this will be corrected by log recovery rebuilding 1025 * the counters from the AGF block counts. 1026 * 1027 * Do not update sb_frextents here because it is not part of the lazy 1028 * sb counters, despite having a percpu counter. It is always kept 1029 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas() 1030 * and hence we don't need have to update it here. 1031 */ 1032 if (xfs_has_lazysbcount(mp)) { 1033 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); 1034 mp->m_sb.sb_ifree = min_t(uint64_t, 1035 percpu_counter_sum(&mp->m_ifree), 1036 mp->m_sb.sb_icount); 1037 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1038 } 1039 1040 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1041 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 1042 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1); 1043 } 1044 1045 /* 1046 * xfs_sync_sb 1047 * 1048 * Sync the superblock to disk. 1049 * 1050 * Note that the caller is responsible for checking the frozen state of the 1051 * filesystem. This procedure uses the non-blocking transaction allocator and 1052 * thus will allow modifications to a frozen fs. This is required because this 1053 * code can be called during the process of freezing where use of the high-level 1054 * allocator would deadlock. 1055 */ 1056 int 1057 xfs_sync_sb( 1058 struct xfs_mount *mp, 1059 bool wait) 1060 { 1061 struct xfs_trans *tp; 1062 int error; 1063 1064 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 1065 XFS_TRANS_NO_WRITECOUNT, &tp); 1066 if (error) 1067 return error; 1068 1069 xfs_log_sb(tp); 1070 if (wait) 1071 xfs_trans_set_sync(tp); 1072 return xfs_trans_commit(tp); 1073 } 1074 1075 /* 1076 * Update all the secondary superblocks to match the new state of the primary. 1077 * Because we are completely overwriting all the existing fields in the 1078 * secondary superblock buffers, there is no need to read them in from disk. 1079 * Just get a new buffer, stamp it and write it. 1080 * 1081 * The sb buffers need to be cached here so that we serialise against other 1082 * operations that access the secondary superblocks, but we don't want to keep 1083 * them in memory once it is written so we mark it as a one-shot buffer. 1084 */ 1085 int 1086 xfs_update_secondary_sbs( 1087 struct xfs_mount *mp) 1088 { 1089 struct xfs_perag *pag; 1090 xfs_agnumber_t agno = 1; 1091 int saved_error = 0; 1092 int error = 0; 1093 LIST_HEAD (buffer_list); 1094 1095 /* update secondary superblocks. */ 1096 for_each_perag_from(mp, agno, pag) { 1097 struct xfs_buf *bp; 1098 1099 error = xfs_buf_get(mp->m_ddev_targp, 1100 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR), 1101 XFS_FSS_TO_BB(mp, 1), &bp); 1102 /* 1103 * If we get an error reading or writing alternate superblocks, 1104 * continue. xfs_repair chooses the "best" superblock based 1105 * on most matches; if we break early, we'll leave more 1106 * superblocks un-updated than updated, and xfs_repair may 1107 * pick them over the properly-updated primary. 1108 */ 1109 if (error) { 1110 xfs_warn(mp, 1111 "error allocating secondary superblock for ag %d", 1112 pag->pag_agno); 1113 if (!saved_error) 1114 saved_error = error; 1115 continue; 1116 } 1117 1118 bp->b_ops = &xfs_sb_buf_ops; 1119 xfs_buf_oneshot(bp); 1120 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 1121 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1122 xfs_buf_delwri_queue(bp, &buffer_list); 1123 xfs_buf_relse(bp); 1124 1125 /* don't hold too many buffers at once */ 1126 if (agno % 16) 1127 continue; 1128 1129 error = xfs_buf_delwri_submit(&buffer_list); 1130 if (error) { 1131 xfs_warn(mp, 1132 "write error %d updating a secondary superblock near ag %d", 1133 error, pag->pag_agno); 1134 if (!saved_error) 1135 saved_error = error; 1136 continue; 1137 } 1138 } 1139 error = xfs_buf_delwri_submit(&buffer_list); 1140 if (error) { 1141 xfs_warn(mp, 1142 "write error %d updating a secondary superblock near ag %d", 1143 error, agno); 1144 } 1145 1146 return saved_error ? saved_error : error; 1147 } 1148 1149 /* 1150 * Same behavior as xfs_sync_sb, except that it is always synchronous and it 1151 * also writes the superblock buffer to disk sector 0 immediately. 1152 */ 1153 int 1154 xfs_sync_sb_buf( 1155 struct xfs_mount *mp) 1156 { 1157 struct xfs_trans *tp; 1158 struct xfs_buf *bp; 1159 int error; 1160 1161 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); 1162 if (error) 1163 return error; 1164 1165 bp = xfs_trans_getsb(tp); 1166 xfs_log_sb(tp); 1167 xfs_trans_bhold(tp, bp); 1168 xfs_trans_set_sync(tp); 1169 error = xfs_trans_commit(tp); 1170 if (error) 1171 goto out; 1172 /* 1173 * write out the sb buffer to get the changes to disk 1174 */ 1175 error = xfs_bwrite(bp); 1176 out: 1177 xfs_buf_relse(bp); 1178 return error; 1179 } 1180 1181 void 1182 xfs_fs_geometry( 1183 struct xfs_mount *mp, 1184 struct xfs_fsop_geom *geo, 1185 int struct_version) 1186 { 1187 struct xfs_sb *sbp = &mp->m_sb; 1188 1189 memset(geo, 0, sizeof(struct xfs_fsop_geom)); 1190 1191 geo->blocksize = sbp->sb_blocksize; 1192 geo->rtextsize = sbp->sb_rextsize; 1193 geo->agblocks = sbp->sb_agblocks; 1194 geo->agcount = sbp->sb_agcount; 1195 geo->logblocks = sbp->sb_logblocks; 1196 geo->sectsize = sbp->sb_sectsize; 1197 geo->inodesize = sbp->sb_inodesize; 1198 geo->imaxpct = sbp->sb_imax_pct; 1199 geo->datablocks = sbp->sb_dblocks; 1200 geo->rtblocks = sbp->sb_rblocks; 1201 geo->rtextents = sbp->sb_rextents; 1202 geo->logstart = sbp->sb_logstart; 1203 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid)); 1204 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid)); 1205 1206 if (struct_version < 2) 1207 return; 1208 1209 geo->sunit = sbp->sb_unit; 1210 geo->swidth = sbp->sb_width; 1211 1212 if (struct_version < 3) 1213 return; 1214 1215 geo->version = XFS_FSOP_GEOM_VERSION; 1216 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 1217 XFS_FSOP_GEOM_FLAGS_DIRV2 | 1218 XFS_FSOP_GEOM_FLAGS_EXTFLG; 1219 if (xfs_has_attr(mp)) 1220 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR; 1221 if (xfs_has_quota(mp)) 1222 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA; 1223 if (xfs_has_align(mp)) 1224 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN; 1225 if (xfs_has_dalign(mp)) 1226 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN; 1227 if (xfs_has_asciici(mp)) 1228 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI; 1229 if (xfs_has_lazysbcount(mp)) 1230 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB; 1231 if (xfs_has_attr2(mp)) 1232 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2; 1233 if (xfs_has_projid32(mp)) 1234 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32; 1235 if (xfs_has_crc(mp)) 1236 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB; 1237 if (xfs_has_ftype(mp)) 1238 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE; 1239 if (xfs_has_finobt(mp)) 1240 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT; 1241 if (xfs_has_sparseinodes(mp)) 1242 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES; 1243 if (xfs_has_rmapbt(mp)) 1244 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT; 1245 if (xfs_has_reflink(mp)) 1246 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK; 1247 if (xfs_has_bigtime(mp)) 1248 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME; 1249 if (xfs_has_inobtcounts(mp)) 1250 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT; 1251 if (xfs_has_sector(mp)) { 1252 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR; 1253 geo->logsectsize = sbp->sb_logsectsize; 1254 } else { 1255 geo->logsectsize = BBSIZE; 1256 } 1257 if (xfs_has_large_extent_counts(mp)) 1258 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64; 1259 geo->rtsectsize = sbp->sb_blocksize; 1260 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp); 1261 1262 if (struct_version < 4) 1263 return; 1264 1265 if (xfs_has_logv2(mp)) 1266 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2; 1267 1268 geo->logsunit = sbp->sb_logsunit; 1269 1270 if (struct_version < 5) 1271 return; 1272 1273 geo->version = XFS_FSOP_GEOM_VERSION_V5; 1274 } 1275 1276 /* Read a secondary superblock. */ 1277 int 1278 xfs_sb_read_secondary( 1279 struct xfs_mount *mp, 1280 struct xfs_trans *tp, 1281 xfs_agnumber_t agno, 1282 struct xfs_buf **bpp) 1283 { 1284 struct xfs_buf *bp; 1285 int error; 1286 1287 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1288 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 1289 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1290 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); 1291 if (error) 1292 return error; 1293 xfs_buf_set_ref(bp, XFS_SSB_REF); 1294 *bpp = bp; 1295 return 0; 1296 } 1297 1298 /* Get an uninitialised secondary superblock buffer. */ 1299 int 1300 xfs_sb_get_secondary( 1301 struct xfs_mount *mp, 1302 struct xfs_trans *tp, 1303 xfs_agnumber_t agno, 1304 struct xfs_buf **bpp) 1305 { 1306 struct xfs_buf *bp; 1307 int error; 1308 1309 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1310 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, 1311 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1312 XFS_FSS_TO_BB(mp, 1), 0, &bp); 1313 if (error) 1314 return error; 1315 bp->b_ops = &xfs_sb_buf_ops; 1316 xfs_buf_oneshot(bp); 1317 *bpp = bp; 1318 return 0; 1319 } 1320 1321 /* 1322 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, 1323 * so users won't be confused by values in error messages. 1324 */ 1325 bool 1326 xfs_validate_stripe_geometry( 1327 struct xfs_mount *mp, 1328 __s64 sunit, 1329 __s64 swidth, 1330 int sectorsize, 1331 bool silent) 1332 { 1333 if (swidth > INT_MAX) { 1334 if (!silent) 1335 xfs_notice(mp, 1336 "stripe width (%lld) is too large", swidth); 1337 return false; 1338 } 1339 1340 if (sunit > swidth) { 1341 if (!silent) 1342 xfs_notice(mp, 1343 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); 1344 return false; 1345 } 1346 1347 if (sectorsize && (int)sunit % sectorsize) { 1348 if (!silent) 1349 xfs_notice(mp, 1350 "stripe unit (%lld) must be a multiple of the sector size (%d)", 1351 sunit, sectorsize); 1352 return false; 1353 } 1354 1355 if (sunit && !swidth) { 1356 if (!silent) 1357 xfs_notice(mp, 1358 "invalid stripe unit (%lld) and stripe width of 0", sunit); 1359 return false; 1360 } 1361 1362 if (!sunit && swidth) { 1363 if (!silent) 1364 xfs_notice(mp, 1365 "invalid stripe width (%lld) and stripe unit of 0", swidth); 1366 return false; 1367 } 1368 1369 if (sunit && (int)swidth % (int)sunit) { 1370 if (!silent) 1371 xfs_notice(mp, 1372 "stripe width (%lld) must be a multiple of the stripe unit (%lld)", 1373 swidth, sunit); 1374 return false; 1375 } 1376 return true; 1377 } 1378 1379 /* 1380 * Compute the maximum level number of the realtime summary file, as defined by 1381 * mkfs. The historic use of highbit32 on a 64-bit quantity prohibited correct 1382 * use of rt volumes with more than 2^32 extents. 1383 */ 1384 uint8_t 1385 xfs_compute_rextslog( 1386 xfs_rtbxlen_t rtextents) 1387 { 1388 if (!rtextents) 1389 return 0; 1390 return xfs_highbit64(rtextents); 1391 } 1392