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