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, 534 xfs_buf_daddr(bp) == XFS_SB_DADDR, false)) 535 return -EFSCORRUPTED; 536 537 /* 538 * Currently only very few inode sizes are supported. 539 */ 540 switch (sbp->sb_inodesize) { 541 case 256: 542 case 512: 543 case 1024: 544 case 2048: 545 break; 546 default: 547 xfs_warn(mp, "inode size of %d bytes not supported", 548 sbp->sb_inodesize); 549 return -ENOSYS; 550 } 551 552 return 0; 553 } 554 555 void 556 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 557 { 558 /* 559 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 560 * leads to in-core values having two different values for a quota 561 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 562 * NULLFSINO. 563 * 564 * Note that this change affect only the in-core values. These 565 * values are not written back to disk unless any quota information 566 * is written to the disk. Even in that case, sb_pquotino field is 567 * not written to disk unless the superblock supports pquotino. 568 */ 569 if (sbp->sb_uquotino == 0) 570 sbp->sb_uquotino = NULLFSINO; 571 if (sbp->sb_gquotino == 0) 572 sbp->sb_gquotino = NULLFSINO; 573 if (sbp->sb_pquotino == 0) 574 sbp->sb_pquotino = NULLFSINO; 575 576 /* 577 * We need to do these manipilations only if we are working 578 * with an older version of on-disk superblock. 579 */ 580 if (xfs_sb_is_v5(sbp)) 581 return; 582 583 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 584 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 585 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 586 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 587 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 588 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 589 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 590 591 if (sbp->sb_qflags & XFS_PQUOTA_ACCT && 592 sbp->sb_gquotino != NULLFSINO) { 593 /* 594 * In older version of superblock, on-disk superblock only 595 * has sb_gquotino, and in-core superblock has both sb_gquotino 596 * and sb_pquotino. But, only one of them is supported at any 597 * point of time. So, if PQUOTA is set in disk superblock, 598 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test 599 * above is to make sure we don't do this twice and wipe them 600 * both out! 601 */ 602 sbp->sb_pquotino = sbp->sb_gquotino; 603 sbp->sb_gquotino = NULLFSINO; 604 } 605 } 606 607 static void 608 __xfs_sb_from_disk( 609 struct xfs_sb *to, 610 struct xfs_dsb *from, 611 bool convert_xquota) 612 { 613 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 614 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 615 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 616 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 617 to->sb_rextents = be64_to_cpu(from->sb_rextents); 618 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 619 to->sb_logstart = be64_to_cpu(from->sb_logstart); 620 to->sb_rootino = be64_to_cpu(from->sb_rootino); 621 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 622 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 623 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 624 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 625 to->sb_agcount = be32_to_cpu(from->sb_agcount); 626 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 627 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 628 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 629 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 630 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 631 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 632 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 633 to->sb_blocklog = from->sb_blocklog; 634 to->sb_sectlog = from->sb_sectlog; 635 to->sb_inodelog = from->sb_inodelog; 636 to->sb_inopblog = from->sb_inopblog; 637 to->sb_agblklog = from->sb_agblklog; 638 to->sb_rextslog = from->sb_rextslog; 639 to->sb_inprogress = from->sb_inprogress; 640 to->sb_imax_pct = from->sb_imax_pct; 641 to->sb_icount = be64_to_cpu(from->sb_icount); 642 to->sb_ifree = be64_to_cpu(from->sb_ifree); 643 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 644 to->sb_frextents = be64_to_cpu(from->sb_frextents); 645 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 646 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 647 to->sb_qflags = be16_to_cpu(from->sb_qflags); 648 to->sb_flags = from->sb_flags; 649 to->sb_shared_vn = from->sb_shared_vn; 650 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 651 to->sb_unit = be32_to_cpu(from->sb_unit); 652 to->sb_width = be32_to_cpu(from->sb_width); 653 to->sb_dirblklog = from->sb_dirblklog; 654 to->sb_logsectlog = from->sb_logsectlog; 655 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 656 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 657 to->sb_features2 = be32_to_cpu(from->sb_features2); 658 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 659 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 660 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 661 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 662 to->sb_features_log_incompat = 663 be32_to_cpu(from->sb_features_log_incompat); 664 /* crc is only used on disk, not in memory; just init to 0 here. */ 665 to->sb_crc = 0; 666 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 667 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 668 to->sb_lsn = be64_to_cpu(from->sb_lsn); 669 /* 670 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 671 * feature flag is set; if not set we keep it only in memory. 672 */ 673 if (xfs_sb_is_v5(to) && 674 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)) 675 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 676 else 677 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 678 /* Convert on-disk flags to in-memory flags? */ 679 if (convert_xquota) 680 xfs_sb_quota_from_disk(to); 681 } 682 683 void 684 xfs_sb_from_disk( 685 struct xfs_sb *to, 686 struct xfs_dsb *from) 687 { 688 __xfs_sb_from_disk(to, from, true); 689 } 690 691 static void 692 xfs_sb_quota_to_disk( 693 struct xfs_dsb *to, 694 struct xfs_sb *from) 695 { 696 uint16_t qflags = from->sb_qflags; 697 698 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 699 700 /* 701 * The in-memory superblock quota state matches the v5 on-disk format so 702 * just write them out and return 703 */ 704 if (xfs_sb_is_v5(from)) { 705 to->sb_qflags = cpu_to_be16(from->sb_qflags); 706 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 707 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 708 return; 709 } 710 711 /* 712 * For older superblocks (v4), the in-core version of sb_qflags do not 713 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So, 714 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 715 */ 716 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 717 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 718 719 if (from->sb_qflags & 720 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 721 qflags |= XFS_OQUOTA_ENFD; 722 if (from->sb_qflags & 723 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 724 qflags |= XFS_OQUOTA_CHKD; 725 to->sb_qflags = cpu_to_be16(qflags); 726 727 /* 728 * GQUOTINO and PQUOTINO cannot be used together in versions 729 * of superblock that do not have pquotino. from->sb_flags 730 * tells us which quota is active and should be copied to 731 * disk. If neither are active, we should NULL the inode. 732 * 733 * In all cases, the separate pquotino must remain 0 because it 734 * is beyond the "end" of the valid non-pquotino superblock. 735 */ 736 if (from->sb_qflags & XFS_GQUOTA_ACCT) 737 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 738 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 739 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 740 else { 741 /* 742 * We can't rely on just the fields being logged to tell us 743 * that it is safe to write NULLFSINO - we should only do that 744 * if quotas are not actually enabled. Hence only write 745 * NULLFSINO if both in-core quota inodes are NULL. 746 */ 747 if (from->sb_gquotino == NULLFSINO && 748 from->sb_pquotino == NULLFSINO) 749 to->sb_gquotino = cpu_to_be64(NULLFSINO); 750 } 751 752 to->sb_pquotino = 0; 753 } 754 755 void 756 xfs_sb_to_disk( 757 struct xfs_dsb *to, 758 struct xfs_sb *from) 759 { 760 xfs_sb_quota_to_disk(to, from); 761 762 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 763 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 764 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 765 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 766 to->sb_rextents = cpu_to_be64(from->sb_rextents); 767 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 768 to->sb_logstart = cpu_to_be64(from->sb_logstart); 769 to->sb_rootino = cpu_to_be64(from->sb_rootino); 770 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 771 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 772 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 773 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 774 to->sb_agcount = cpu_to_be32(from->sb_agcount); 775 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 776 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 777 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 778 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 779 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 780 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 781 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 782 to->sb_blocklog = from->sb_blocklog; 783 to->sb_sectlog = from->sb_sectlog; 784 to->sb_inodelog = from->sb_inodelog; 785 to->sb_inopblog = from->sb_inopblog; 786 to->sb_agblklog = from->sb_agblklog; 787 to->sb_rextslog = from->sb_rextslog; 788 to->sb_inprogress = from->sb_inprogress; 789 to->sb_imax_pct = from->sb_imax_pct; 790 to->sb_icount = cpu_to_be64(from->sb_icount); 791 to->sb_ifree = cpu_to_be64(from->sb_ifree); 792 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 793 to->sb_frextents = cpu_to_be64(from->sb_frextents); 794 795 to->sb_flags = from->sb_flags; 796 to->sb_shared_vn = from->sb_shared_vn; 797 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 798 to->sb_unit = cpu_to_be32(from->sb_unit); 799 to->sb_width = cpu_to_be32(from->sb_width); 800 to->sb_dirblklog = from->sb_dirblklog; 801 to->sb_logsectlog = from->sb_logsectlog; 802 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 803 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 804 805 /* 806 * We need to ensure that bad_features2 always matches features2. 807 * Hence we enforce that here rather than having to remember to do it 808 * everywhere else that updates features2. 809 */ 810 from->sb_bad_features2 = from->sb_features2; 811 to->sb_features2 = cpu_to_be32(from->sb_features2); 812 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 813 814 if (!xfs_sb_is_v5(from)) 815 return; 816 817 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 818 to->sb_features_ro_compat = 819 cpu_to_be32(from->sb_features_ro_compat); 820 to->sb_features_incompat = 821 cpu_to_be32(from->sb_features_incompat); 822 to->sb_features_log_incompat = 823 cpu_to_be32(from->sb_features_log_incompat); 824 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 825 to->sb_lsn = cpu_to_be64(from->sb_lsn); 826 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID) 827 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 828 } 829 830 /* 831 * If the superblock has the CRC feature bit set or the CRC field is non-null, 832 * check that the CRC is valid. We check the CRC field is non-null because a 833 * single bit error could clear the feature bit and unused parts of the 834 * superblock are supposed to be zero. Hence a non-null crc field indicates that 835 * we've potentially lost a feature bit and we should check it anyway. 836 * 837 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 838 * last field in V4 secondary superblocks. So for secondary superblocks, 839 * we are more forgiving, and ignore CRC failures if the primary doesn't 840 * indicate that the fs version is V5. 841 */ 842 static void 843 xfs_sb_read_verify( 844 struct xfs_buf *bp) 845 { 846 struct xfs_sb sb; 847 struct xfs_mount *mp = bp->b_mount; 848 struct xfs_dsb *dsb = bp->b_addr; 849 int error; 850 851 /* 852 * open code the version check to avoid needing to convert the entire 853 * superblock from disk order just to check the version number 854 */ 855 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 856 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 857 XFS_SB_VERSION_5) || 858 dsb->sb_crc != 0)) { 859 860 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 861 /* Only fail bad secondaries on a known V5 filesystem */ 862 if (xfs_buf_daddr(bp) == XFS_SB_DADDR || 863 xfs_has_crc(mp)) { 864 error = -EFSBADCRC; 865 goto out_error; 866 } 867 } 868 } 869 870 /* 871 * Check all the superblock fields. Don't byteswap the xquota flags 872 * because _verify_common checks the on-disk values. 873 */ 874 __xfs_sb_from_disk(&sb, dsb, false); 875 error = xfs_validate_sb_common(mp, bp, &sb); 876 if (error) 877 goto out_error; 878 error = xfs_validate_sb_read(mp, &sb); 879 880 out_error: 881 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 882 xfs_verifier_error(bp, error, __this_address); 883 else if (error) 884 xfs_buf_ioerror(bp, error); 885 } 886 887 /* 888 * We may be probed for a filesystem match, so we may not want to emit 889 * messages when the superblock buffer is not actually an XFS superblock. 890 * If we find an XFS superblock, then run a normal, noisy mount because we are 891 * really going to mount it and want to know about errors. 892 */ 893 static void 894 xfs_sb_quiet_read_verify( 895 struct xfs_buf *bp) 896 { 897 struct xfs_dsb *dsb = bp->b_addr; 898 899 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 900 /* XFS filesystem, verify noisily! */ 901 xfs_sb_read_verify(bp); 902 return; 903 } 904 /* quietly fail */ 905 xfs_buf_ioerror(bp, -EWRONGFS); 906 } 907 908 static void 909 xfs_sb_write_verify( 910 struct xfs_buf *bp) 911 { 912 struct xfs_sb sb; 913 struct xfs_mount *mp = bp->b_mount; 914 struct xfs_buf_log_item *bip = bp->b_log_item; 915 struct xfs_dsb *dsb = bp->b_addr; 916 int error; 917 918 /* 919 * Check all the superblock fields. Don't byteswap the xquota flags 920 * because _verify_common checks the on-disk values. 921 */ 922 __xfs_sb_from_disk(&sb, dsb, false); 923 error = xfs_validate_sb_common(mp, bp, &sb); 924 if (error) 925 goto out_error; 926 error = xfs_validate_sb_write(mp, bp, &sb); 927 if (error) 928 goto out_error; 929 930 if (!xfs_sb_is_v5(&sb)) 931 return; 932 933 if (bip) 934 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 935 936 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 937 return; 938 939 out_error: 940 xfs_verifier_error(bp, error, __this_address); 941 } 942 943 const struct xfs_buf_ops xfs_sb_buf_ops = { 944 .name = "xfs_sb", 945 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 946 .verify_read = xfs_sb_read_verify, 947 .verify_write = xfs_sb_write_verify, 948 }; 949 950 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 951 .name = "xfs_sb_quiet", 952 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) }, 953 .verify_read = xfs_sb_quiet_read_verify, 954 .verify_write = xfs_sb_write_verify, 955 }; 956 957 /* 958 * xfs_mount_common 959 * 960 * Mount initialization code establishing various mount 961 * fields from the superblock associated with the given 962 * mount structure. 963 * 964 * Inode geometry are calculated in xfs_ialloc_setup_geometry. 965 */ 966 void 967 xfs_sb_mount_common( 968 struct xfs_mount *mp, 969 struct xfs_sb *sbp) 970 { 971 mp->m_agfrotor = 0; 972 atomic_set(&mp->m_agirotor, 0); 973 mp->m_maxagi = mp->m_sb.sb_agcount; 974 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 975 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 976 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 977 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 978 mp->m_blockmask = sbp->sb_blocksize - 1; 979 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 980 mp->m_blockwmask = mp->m_blockwsize - 1; 981 982 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 983 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 984 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 985 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 986 987 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 988 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 989 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 990 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 991 992 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1); 993 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0); 994 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 995 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 996 997 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true); 998 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false); 999 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; 1000 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; 1001 1002 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 1003 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 1004 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 1005 } 1006 1007 /* 1008 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 1009 * into the superblock buffer to be logged. It does not provide the higher 1010 * level of locking that is needed to protect the in-core superblock from 1011 * concurrent access. 1012 */ 1013 void 1014 xfs_log_sb( 1015 struct xfs_trans *tp) 1016 { 1017 struct xfs_mount *mp = tp->t_mountp; 1018 struct xfs_buf *bp = xfs_trans_getsb(tp); 1019 1020 /* 1021 * Lazy sb counters don't update the in-core superblock so do that now. 1022 * If this is at unmount, the counters will be exactly correct, but at 1023 * any other time they will only be ballpark correct because of 1024 * reservations that have been taken out percpu counters. If we have an 1025 * unclean shutdown, this will be corrected by log recovery rebuilding 1026 * the counters from the AGF block counts. 1027 * 1028 * Do not update sb_frextents here because it is not part of the lazy 1029 * sb counters, despite having a percpu counter. It is always kept 1030 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas() 1031 * and hence we don't need have to update it here. 1032 */ 1033 if (xfs_has_lazysbcount(mp)) { 1034 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); 1035 mp->m_sb.sb_ifree = min_t(uint64_t, 1036 percpu_counter_sum(&mp->m_ifree), 1037 mp->m_sb.sb_icount); 1038 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1039 } 1040 1041 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1042 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 1043 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1); 1044 } 1045 1046 /* 1047 * xfs_sync_sb 1048 * 1049 * Sync the superblock to disk. 1050 * 1051 * Note that the caller is responsible for checking the frozen state of the 1052 * filesystem. This procedure uses the non-blocking transaction allocator and 1053 * thus will allow modifications to a frozen fs. This is required because this 1054 * code can be called during the process of freezing where use of the high-level 1055 * allocator would deadlock. 1056 */ 1057 int 1058 xfs_sync_sb( 1059 struct xfs_mount *mp, 1060 bool wait) 1061 { 1062 struct xfs_trans *tp; 1063 int error; 1064 1065 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 1066 XFS_TRANS_NO_WRITECOUNT, &tp); 1067 if (error) 1068 return error; 1069 1070 xfs_log_sb(tp); 1071 if (wait) 1072 xfs_trans_set_sync(tp); 1073 return xfs_trans_commit(tp); 1074 } 1075 1076 /* 1077 * Update all the secondary superblocks to match the new state of the primary. 1078 * Because we are completely overwriting all the existing fields in the 1079 * secondary superblock buffers, there is no need to read them in from disk. 1080 * Just get a new buffer, stamp it and write it. 1081 * 1082 * The sb buffers need to be cached here so that we serialise against other 1083 * operations that access the secondary superblocks, but we don't want to keep 1084 * them in memory once it is written so we mark it as a one-shot buffer. 1085 */ 1086 int 1087 xfs_update_secondary_sbs( 1088 struct xfs_mount *mp) 1089 { 1090 struct xfs_perag *pag; 1091 xfs_agnumber_t agno = 1; 1092 int saved_error = 0; 1093 int error = 0; 1094 LIST_HEAD (buffer_list); 1095 1096 /* update secondary superblocks. */ 1097 for_each_perag_from(mp, agno, pag) { 1098 struct xfs_buf *bp; 1099 1100 error = xfs_buf_get(mp->m_ddev_targp, 1101 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR), 1102 XFS_FSS_TO_BB(mp, 1), &bp); 1103 /* 1104 * If we get an error reading or writing alternate superblocks, 1105 * continue. xfs_repair chooses the "best" superblock based 1106 * on most matches; if we break early, we'll leave more 1107 * superblocks un-updated than updated, and xfs_repair may 1108 * pick them over the properly-updated primary. 1109 */ 1110 if (error) { 1111 xfs_warn(mp, 1112 "error allocating secondary superblock for ag %d", 1113 pag->pag_agno); 1114 if (!saved_error) 1115 saved_error = error; 1116 continue; 1117 } 1118 1119 bp->b_ops = &xfs_sb_buf_ops; 1120 xfs_buf_oneshot(bp); 1121 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 1122 xfs_sb_to_disk(bp->b_addr, &mp->m_sb); 1123 xfs_buf_delwri_queue(bp, &buffer_list); 1124 xfs_buf_relse(bp); 1125 1126 /* don't hold too many buffers at once */ 1127 if (agno % 16) 1128 continue; 1129 1130 error = xfs_buf_delwri_submit(&buffer_list); 1131 if (error) { 1132 xfs_warn(mp, 1133 "write error %d updating a secondary superblock near ag %d", 1134 error, pag->pag_agno); 1135 if (!saved_error) 1136 saved_error = error; 1137 continue; 1138 } 1139 } 1140 error = xfs_buf_delwri_submit(&buffer_list); 1141 if (error) { 1142 xfs_warn(mp, 1143 "write error %d updating a secondary superblock near ag %d", 1144 error, agno); 1145 } 1146 1147 return saved_error ? saved_error : error; 1148 } 1149 1150 /* 1151 * Same behavior as xfs_sync_sb, except that it is always synchronous and it 1152 * also writes the superblock buffer to disk sector 0 immediately. 1153 */ 1154 int 1155 xfs_sync_sb_buf( 1156 struct xfs_mount *mp) 1157 { 1158 struct xfs_trans *tp; 1159 struct xfs_buf *bp; 1160 int error; 1161 1162 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); 1163 if (error) 1164 return error; 1165 1166 bp = xfs_trans_getsb(tp); 1167 xfs_log_sb(tp); 1168 xfs_trans_bhold(tp, bp); 1169 xfs_trans_set_sync(tp); 1170 error = xfs_trans_commit(tp); 1171 if (error) 1172 goto out; 1173 /* 1174 * write out the sb buffer to get the changes to disk 1175 */ 1176 error = xfs_bwrite(bp); 1177 out: 1178 xfs_buf_relse(bp); 1179 return error; 1180 } 1181 1182 void 1183 xfs_fs_geometry( 1184 struct xfs_mount *mp, 1185 struct xfs_fsop_geom *geo, 1186 int struct_version) 1187 { 1188 struct xfs_sb *sbp = &mp->m_sb; 1189 1190 memset(geo, 0, sizeof(struct xfs_fsop_geom)); 1191 1192 geo->blocksize = sbp->sb_blocksize; 1193 geo->rtextsize = sbp->sb_rextsize; 1194 geo->agblocks = sbp->sb_agblocks; 1195 geo->agcount = sbp->sb_agcount; 1196 geo->logblocks = sbp->sb_logblocks; 1197 geo->sectsize = sbp->sb_sectsize; 1198 geo->inodesize = sbp->sb_inodesize; 1199 geo->imaxpct = sbp->sb_imax_pct; 1200 geo->datablocks = sbp->sb_dblocks; 1201 geo->rtblocks = sbp->sb_rblocks; 1202 geo->rtextents = sbp->sb_rextents; 1203 geo->logstart = sbp->sb_logstart; 1204 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid)); 1205 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid)); 1206 1207 if (struct_version < 2) 1208 return; 1209 1210 geo->sunit = sbp->sb_unit; 1211 geo->swidth = sbp->sb_width; 1212 1213 if (struct_version < 3) 1214 return; 1215 1216 geo->version = XFS_FSOP_GEOM_VERSION; 1217 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 1218 XFS_FSOP_GEOM_FLAGS_DIRV2 | 1219 XFS_FSOP_GEOM_FLAGS_EXTFLG; 1220 if (xfs_has_attr(mp)) 1221 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR; 1222 if (xfs_has_quota(mp)) 1223 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA; 1224 if (xfs_has_align(mp)) 1225 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN; 1226 if (xfs_has_dalign(mp)) 1227 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN; 1228 if (xfs_has_asciici(mp)) 1229 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI; 1230 if (xfs_has_lazysbcount(mp)) 1231 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB; 1232 if (xfs_has_attr2(mp)) 1233 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2; 1234 if (xfs_has_projid32(mp)) 1235 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32; 1236 if (xfs_has_crc(mp)) 1237 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB; 1238 if (xfs_has_ftype(mp)) 1239 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE; 1240 if (xfs_has_finobt(mp)) 1241 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT; 1242 if (xfs_has_sparseinodes(mp)) 1243 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES; 1244 if (xfs_has_rmapbt(mp)) 1245 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT; 1246 if (xfs_has_reflink(mp)) 1247 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK; 1248 if (xfs_has_bigtime(mp)) 1249 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME; 1250 if (xfs_has_inobtcounts(mp)) 1251 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT; 1252 if (xfs_has_sector(mp)) { 1253 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR; 1254 geo->logsectsize = sbp->sb_logsectsize; 1255 } else { 1256 geo->logsectsize = BBSIZE; 1257 } 1258 if (xfs_has_large_extent_counts(mp)) 1259 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64; 1260 geo->rtsectsize = sbp->sb_blocksize; 1261 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp); 1262 1263 if (struct_version < 4) 1264 return; 1265 1266 if (xfs_has_logv2(mp)) 1267 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2; 1268 1269 geo->logsunit = sbp->sb_logsunit; 1270 1271 if (struct_version < 5) 1272 return; 1273 1274 geo->version = XFS_FSOP_GEOM_VERSION_V5; 1275 } 1276 1277 /* Read a secondary superblock. */ 1278 int 1279 xfs_sb_read_secondary( 1280 struct xfs_mount *mp, 1281 struct xfs_trans *tp, 1282 xfs_agnumber_t agno, 1283 struct xfs_buf **bpp) 1284 { 1285 struct xfs_buf *bp; 1286 int error; 1287 1288 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1289 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, 1290 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1291 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); 1292 if (error) 1293 return error; 1294 xfs_buf_set_ref(bp, XFS_SSB_REF); 1295 *bpp = bp; 1296 return 0; 1297 } 1298 1299 /* Get an uninitialised secondary superblock buffer. */ 1300 int 1301 xfs_sb_get_secondary( 1302 struct xfs_mount *mp, 1303 struct xfs_trans *tp, 1304 xfs_agnumber_t agno, 1305 struct xfs_buf **bpp) 1306 { 1307 struct xfs_buf *bp; 1308 int error; 1309 1310 ASSERT(agno != 0 && agno != NULLAGNUMBER); 1311 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, 1312 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 1313 XFS_FSS_TO_BB(mp, 1), 0, &bp); 1314 if (error) 1315 return error; 1316 bp->b_ops = &xfs_sb_buf_ops; 1317 xfs_buf_oneshot(bp); 1318 *bpp = bp; 1319 return 0; 1320 } 1321 1322 /* 1323 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, so users 1324 * won't be confused by values in error messages. This function returns false 1325 * if the stripe geometry is invalid and the caller is unable to repair the 1326 * stripe configuration later in the mount process. 1327 */ 1328 bool 1329 xfs_validate_stripe_geometry( 1330 struct xfs_mount *mp, 1331 __s64 sunit, 1332 __s64 swidth, 1333 int sectorsize, 1334 bool may_repair, 1335 bool silent) 1336 { 1337 if (swidth > INT_MAX) { 1338 if (!silent) 1339 xfs_notice(mp, 1340 "stripe width (%lld) is too large", swidth); 1341 goto check_override; 1342 } 1343 1344 if (sunit > swidth) { 1345 if (!silent) 1346 xfs_notice(mp, 1347 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); 1348 goto check_override; 1349 } 1350 1351 if (sectorsize && (int)sunit % sectorsize) { 1352 if (!silent) 1353 xfs_notice(mp, 1354 "stripe unit (%lld) must be a multiple of the sector size (%d)", 1355 sunit, sectorsize); 1356 goto check_override; 1357 } 1358 1359 if (sunit && !swidth) { 1360 if (!silent) 1361 xfs_notice(mp, 1362 "invalid stripe unit (%lld) and stripe width of 0", sunit); 1363 goto check_override; 1364 } 1365 1366 if (!sunit && swidth) { 1367 if (!silent) 1368 xfs_notice(mp, 1369 "invalid stripe width (%lld) and stripe unit of 0", swidth); 1370 goto check_override; 1371 } 1372 1373 if (sunit && (int)swidth % (int)sunit) { 1374 if (!silent) 1375 xfs_notice(mp, 1376 "stripe width (%lld) must be a multiple of the stripe unit (%lld)", 1377 swidth, sunit); 1378 goto check_override; 1379 } 1380 return true; 1381 1382 check_override: 1383 if (!may_repair) 1384 return false; 1385 /* 1386 * During mount, mp->m_dalign will not be set unless the sunit mount 1387 * option was set. If it was set, ignore the bad stripe alignment values 1388 * and allow the validation and overwrite later in the mount process to 1389 * attempt to overwrite the bad stripe alignment values with the values 1390 * supplied by mount options. 1391 */ 1392 if (!mp->m_dalign) 1393 return false; 1394 if (!silent) 1395 xfs_notice(mp, 1396 "Will try to correct with specified mount options sunit (%d) and swidth (%d)", 1397 BBTOB(mp->m_dalign), BBTOB(mp->m_swidth)); 1398 return true; 1399 } 1400 1401 /* 1402 * Compute the maximum level number of the realtime summary file, as defined by 1403 * mkfs. The historic use of highbit32 on a 64-bit quantity prohibited correct 1404 * use of rt volumes with more than 2^32 extents. 1405 */ 1406 uint8_t 1407 xfs_compute_rextslog( 1408 xfs_rtbxlen_t rtextents) 1409 { 1410 if (!rtextents) 1411 return 0; 1412 return xfs_highbit64(rtextents); 1413 } 1414