1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_bit.h" 25 #include "xfs_sb.h" 26 #include "xfs_mount.h" 27 #include "xfs_defer.h" 28 #include "xfs_inode.h" 29 #include "xfs_ialloc.h" 30 #include "xfs_alloc.h" 31 #include "xfs_error.h" 32 #include "xfs_trace.h" 33 #include "xfs_cksum.h" 34 #include "xfs_trans.h" 35 #include "xfs_buf_item.h" 36 #include "xfs_bmap_btree.h" 37 #include "xfs_alloc_btree.h" 38 #include "xfs_ialloc_btree.h" 39 #include "xfs_log.h" 40 #include "xfs_rmap_btree.h" 41 42 /* 43 * Physical superblock buffer manipulations. Shared with libxfs in userspace. 44 */ 45 46 /* 47 * Reference counting access wrappers to the perag structures. 48 * Because we never free per-ag structures, the only thing we 49 * have to protect against changes is the tree structure itself. 50 */ 51 struct xfs_perag * 52 xfs_perag_get( 53 struct xfs_mount *mp, 54 xfs_agnumber_t agno) 55 { 56 struct xfs_perag *pag; 57 int ref = 0; 58 59 rcu_read_lock(); 60 pag = radix_tree_lookup(&mp->m_perag_tree, agno); 61 if (pag) { 62 ASSERT(atomic_read(&pag->pag_ref) >= 0); 63 ref = atomic_inc_return(&pag->pag_ref); 64 } 65 rcu_read_unlock(); 66 trace_xfs_perag_get(mp, agno, ref, _RET_IP_); 67 return pag; 68 } 69 70 /* 71 * search from @first to find the next perag with the given tag set. 72 */ 73 struct xfs_perag * 74 xfs_perag_get_tag( 75 struct xfs_mount *mp, 76 xfs_agnumber_t first, 77 int tag) 78 { 79 struct xfs_perag *pag; 80 int found; 81 int ref; 82 83 rcu_read_lock(); 84 found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, 85 (void **)&pag, first, 1, tag); 86 if (found <= 0) { 87 rcu_read_unlock(); 88 return NULL; 89 } 90 ref = atomic_inc_return(&pag->pag_ref); 91 rcu_read_unlock(); 92 trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); 93 return pag; 94 } 95 96 void 97 xfs_perag_put( 98 struct xfs_perag *pag) 99 { 100 int ref; 101 102 ASSERT(atomic_read(&pag->pag_ref) > 0); 103 ref = atomic_dec_return(&pag->pag_ref); 104 trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); 105 } 106 107 /* 108 * Check the validity of the SB found. 109 */ 110 STATIC int 111 xfs_mount_validate_sb( 112 xfs_mount_t *mp, 113 xfs_sb_t *sbp, 114 bool check_inprogress, 115 bool check_version) 116 { 117 if (sbp->sb_magicnum != XFS_SB_MAGIC) { 118 xfs_warn(mp, "bad magic number"); 119 return -EWRONGFS; 120 } 121 122 123 if (!xfs_sb_good_version(sbp)) { 124 xfs_warn(mp, "bad version"); 125 return -EWRONGFS; 126 } 127 128 /* 129 * Version 5 superblock feature mask validation. Reject combinations the 130 * kernel cannot support up front before checking anything else. For 131 * write validation, we don't need to check feature masks. 132 */ 133 if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { 134 if (xfs_sb_has_compat_feature(sbp, 135 XFS_SB_FEAT_COMPAT_UNKNOWN)) { 136 xfs_warn(mp, 137 "Superblock has unknown compatible features (0x%x) enabled.", 138 (sbp->sb_features_compat & 139 XFS_SB_FEAT_COMPAT_UNKNOWN)); 140 xfs_warn(mp, 141 "Using a more recent kernel is recommended."); 142 } 143 144 if (xfs_sb_has_ro_compat_feature(sbp, 145 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 146 xfs_alert(mp, 147 "Superblock has unknown read-only compatible features (0x%x) enabled.", 148 (sbp->sb_features_ro_compat & 149 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 150 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { 151 xfs_warn(mp, 152 "Attempted to mount read-only compatible filesystem read-write."); 153 xfs_warn(mp, 154 "Filesystem can only be safely mounted read only."); 155 156 return -EINVAL; 157 } 158 } 159 if (xfs_sb_has_incompat_feature(sbp, 160 XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 161 xfs_warn(mp, 162 "Superblock has unknown incompatible features (0x%x) enabled.", 163 (sbp->sb_features_incompat & 164 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 165 xfs_warn(mp, 166 "Filesystem can not be safely mounted by this kernel."); 167 return -EINVAL; 168 } 169 } else if (xfs_sb_version_hascrc(sbp)) { 170 /* 171 * We can't read verify the sb LSN because the read verifier is 172 * called before the log is allocated and processed. We know the 173 * log is set up before write verifier (!check_version) calls, 174 * so just check it here. 175 */ 176 if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) 177 return -EFSCORRUPTED; 178 } 179 180 if (xfs_sb_version_has_pquotino(sbp)) { 181 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 182 xfs_notice(mp, 183 "Version 5 of Super block has XFS_OQUOTA bits."); 184 return -EFSCORRUPTED; 185 } 186 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 187 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 188 xfs_notice(mp, 189 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits."); 190 return -EFSCORRUPTED; 191 } 192 193 /* 194 * Full inode chunks must be aligned to inode chunk size when 195 * sparse inodes are enabled to support the sparse chunk 196 * allocation algorithm and prevent overlapping inode records. 197 */ 198 if (xfs_sb_version_hassparseinodes(sbp)) { 199 uint32_t align; 200 201 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize 202 >> sbp->sb_blocklog; 203 if (sbp->sb_inoalignmt != align) { 204 xfs_warn(mp, 205 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", 206 sbp->sb_inoalignmt, align); 207 return -EINVAL; 208 } 209 } 210 211 if (unlikely( 212 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 213 xfs_warn(mp, 214 "filesystem is marked as having an external log; " 215 "specify logdev on the mount command line."); 216 return -EINVAL; 217 } 218 219 if (unlikely( 220 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 221 xfs_warn(mp, 222 "filesystem is marked as having an internal log; " 223 "do not specify logdev on the mount command line."); 224 return -EINVAL; 225 } 226 227 /* 228 * More sanity checking. Most of these were stolen directly from 229 * xfs_repair. 230 */ 231 if (unlikely( 232 sbp->sb_agcount <= 0 || 233 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 234 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 235 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 236 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 237 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 238 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 239 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 240 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 241 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 242 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 243 sbp->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG || 244 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 245 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 246 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 247 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 248 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 249 sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE || 250 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 251 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 252 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 253 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 254 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 255 sbp->sb_dblocks == 0 || 256 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 257 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 258 sbp->sb_shared_vn != 0)) { 259 xfs_notice(mp, "SB sanity check failed"); 260 return -EFSCORRUPTED; 261 } 262 263 /* 264 * Until this is fixed only page-sized or smaller data blocks work. 265 */ 266 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { 267 xfs_warn(mp, 268 "File system with blocksize %d bytes. " 269 "Only pagesize (%ld) or less will currently work.", 270 sbp->sb_blocksize, PAGE_SIZE); 271 return -ENOSYS; 272 } 273 274 /* 275 * Currently only very few inode sizes are supported. 276 */ 277 switch (sbp->sb_inodesize) { 278 case 256: 279 case 512: 280 case 1024: 281 case 2048: 282 break; 283 default: 284 xfs_warn(mp, "inode size of %d bytes not supported", 285 sbp->sb_inodesize); 286 return -ENOSYS; 287 } 288 289 if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || 290 xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { 291 xfs_warn(mp, 292 "file system too large to be mounted on this system."); 293 return -EFBIG; 294 } 295 296 if (check_inprogress && sbp->sb_inprogress) { 297 xfs_warn(mp, "Offline file system operation in progress!"); 298 return -EFSCORRUPTED; 299 } 300 return 0; 301 } 302 303 void 304 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 305 { 306 /* 307 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 308 * leads to in-core values having two different values for a quota 309 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 310 * NULLFSINO. 311 * 312 * Note that this change affect only the in-core values. These 313 * values are not written back to disk unless any quota information 314 * is written to the disk. Even in that case, sb_pquotino field is 315 * not written to disk unless the superblock supports pquotino. 316 */ 317 if (sbp->sb_uquotino == 0) 318 sbp->sb_uquotino = NULLFSINO; 319 if (sbp->sb_gquotino == 0) 320 sbp->sb_gquotino = NULLFSINO; 321 if (sbp->sb_pquotino == 0) 322 sbp->sb_pquotino = NULLFSINO; 323 324 /* 325 * We need to do these manipilations only if we are working 326 * with an older version of on-disk superblock. 327 */ 328 if (xfs_sb_version_has_pquotino(sbp)) 329 return; 330 331 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 332 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 333 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 334 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 335 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 336 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 337 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 338 339 if (sbp->sb_qflags & XFS_PQUOTA_ACCT) { 340 /* 341 * In older version of superblock, on-disk superblock only 342 * has sb_gquotino, and in-core superblock has both sb_gquotino 343 * and sb_pquotino. But, only one of them is supported at any 344 * point of time. So, if PQUOTA is set in disk superblock, 345 * copy over sb_gquotino to sb_pquotino. 346 */ 347 sbp->sb_pquotino = sbp->sb_gquotino; 348 sbp->sb_gquotino = NULLFSINO; 349 } 350 } 351 352 static void 353 __xfs_sb_from_disk( 354 struct xfs_sb *to, 355 xfs_dsb_t *from, 356 bool convert_xquota) 357 { 358 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 359 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 360 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 361 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 362 to->sb_rextents = be64_to_cpu(from->sb_rextents); 363 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 364 to->sb_logstart = be64_to_cpu(from->sb_logstart); 365 to->sb_rootino = be64_to_cpu(from->sb_rootino); 366 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 367 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 368 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 369 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 370 to->sb_agcount = be32_to_cpu(from->sb_agcount); 371 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 372 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 373 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 374 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 375 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 376 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 377 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 378 to->sb_blocklog = from->sb_blocklog; 379 to->sb_sectlog = from->sb_sectlog; 380 to->sb_inodelog = from->sb_inodelog; 381 to->sb_inopblog = from->sb_inopblog; 382 to->sb_agblklog = from->sb_agblklog; 383 to->sb_rextslog = from->sb_rextslog; 384 to->sb_inprogress = from->sb_inprogress; 385 to->sb_imax_pct = from->sb_imax_pct; 386 to->sb_icount = be64_to_cpu(from->sb_icount); 387 to->sb_ifree = be64_to_cpu(from->sb_ifree); 388 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 389 to->sb_frextents = be64_to_cpu(from->sb_frextents); 390 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 391 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 392 to->sb_qflags = be16_to_cpu(from->sb_qflags); 393 to->sb_flags = from->sb_flags; 394 to->sb_shared_vn = from->sb_shared_vn; 395 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 396 to->sb_unit = be32_to_cpu(from->sb_unit); 397 to->sb_width = be32_to_cpu(from->sb_width); 398 to->sb_dirblklog = from->sb_dirblklog; 399 to->sb_logsectlog = from->sb_logsectlog; 400 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 401 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 402 to->sb_features2 = be32_to_cpu(from->sb_features2); 403 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 404 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 405 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 406 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 407 to->sb_features_log_incompat = 408 be32_to_cpu(from->sb_features_log_incompat); 409 /* crc is only used on disk, not in memory; just init to 0 here. */ 410 to->sb_crc = 0; 411 to->sb_spino_align = be32_to_cpu(from->sb_spino_align); 412 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 413 to->sb_lsn = be64_to_cpu(from->sb_lsn); 414 /* 415 * sb_meta_uuid is only on disk if it differs from sb_uuid and the 416 * feature flag is set; if not set we keep it only in memory. 417 */ 418 if (xfs_sb_version_hasmetauuid(to)) 419 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 420 else 421 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); 422 /* Convert on-disk flags to in-memory flags? */ 423 if (convert_xquota) 424 xfs_sb_quota_from_disk(to); 425 } 426 427 void 428 xfs_sb_from_disk( 429 struct xfs_sb *to, 430 xfs_dsb_t *from) 431 { 432 __xfs_sb_from_disk(to, from, true); 433 } 434 435 static void 436 xfs_sb_quota_to_disk( 437 struct xfs_dsb *to, 438 struct xfs_sb *from) 439 { 440 __uint16_t qflags = from->sb_qflags; 441 442 to->sb_uquotino = cpu_to_be64(from->sb_uquotino); 443 if (xfs_sb_version_has_pquotino(from)) { 444 to->sb_qflags = cpu_to_be16(from->sb_qflags); 445 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 446 to->sb_pquotino = cpu_to_be64(from->sb_pquotino); 447 return; 448 } 449 450 /* 451 * The in-core version of sb_qflags do not have XFS_OQUOTA_* 452 * flags, whereas the on-disk version does. So, convert incore 453 * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. 454 */ 455 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 456 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 457 458 if (from->sb_qflags & 459 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 460 qflags |= XFS_OQUOTA_ENFD; 461 if (from->sb_qflags & 462 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 463 qflags |= XFS_OQUOTA_CHKD; 464 to->sb_qflags = cpu_to_be16(qflags); 465 466 /* 467 * GQUOTINO and PQUOTINO cannot be used together in versions 468 * of superblock that do not have pquotino. from->sb_flags 469 * tells us which quota is active and should be copied to 470 * disk. If neither are active, we should NULL the inode. 471 * 472 * In all cases, the separate pquotino must remain 0 because it 473 * it beyond the "end" of the valid non-pquotino superblock. 474 */ 475 if (from->sb_qflags & XFS_GQUOTA_ACCT) 476 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 477 else if (from->sb_qflags & XFS_PQUOTA_ACCT) 478 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 479 else { 480 /* 481 * We can't rely on just the fields being logged to tell us 482 * that it is safe to write NULLFSINO - we should only do that 483 * if quotas are not actually enabled. Hence only write 484 * NULLFSINO if both in-core quota inodes are NULL. 485 */ 486 if (from->sb_gquotino == NULLFSINO && 487 from->sb_pquotino == NULLFSINO) 488 to->sb_gquotino = cpu_to_be64(NULLFSINO); 489 } 490 491 to->sb_pquotino = 0; 492 } 493 494 void 495 xfs_sb_to_disk( 496 struct xfs_dsb *to, 497 struct xfs_sb *from) 498 { 499 xfs_sb_quota_to_disk(to, from); 500 501 to->sb_magicnum = cpu_to_be32(from->sb_magicnum); 502 to->sb_blocksize = cpu_to_be32(from->sb_blocksize); 503 to->sb_dblocks = cpu_to_be64(from->sb_dblocks); 504 to->sb_rblocks = cpu_to_be64(from->sb_rblocks); 505 to->sb_rextents = cpu_to_be64(from->sb_rextents); 506 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 507 to->sb_logstart = cpu_to_be64(from->sb_logstart); 508 to->sb_rootino = cpu_to_be64(from->sb_rootino); 509 to->sb_rbmino = cpu_to_be64(from->sb_rbmino); 510 to->sb_rsumino = cpu_to_be64(from->sb_rsumino); 511 to->sb_rextsize = cpu_to_be32(from->sb_rextsize); 512 to->sb_agblocks = cpu_to_be32(from->sb_agblocks); 513 to->sb_agcount = cpu_to_be32(from->sb_agcount); 514 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); 515 to->sb_logblocks = cpu_to_be32(from->sb_logblocks); 516 to->sb_versionnum = cpu_to_be16(from->sb_versionnum); 517 to->sb_sectsize = cpu_to_be16(from->sb_sectsize); 518 to->sb_inodesize = cpu_to_be16(from->sb_inodesize); 519 to->sb_inopblock = cpu_to_be16(from->sb_inopblock); 520 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 521 to->sb_blocklog = from->sb_blocklog; 522 to->sb_sectlog = from->sb_sectlog; 523 to->sb_inodelog = from->sb_inodelog; 524 to->sb_inopblog = from->sb_inopblog; 525 to->sb_agblklog = from->sb_agblklog; 526 to->sb_rextslog = from->sb_rextslog; 527 to->sb_inprogress = from->sb_inprogress; 528 to->sb_imax_pct = from->sb_imax_pct; 529 to->sb_icount = cpu_to_be64(from->sb_icount); 530 to->sb_ifree = cpu_to_be64(from->sb_ifree); 531 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); 532 to->sb_frextents = cpu_to_be64(from->sb_frextents); 533 534 to->sb_flags = from->sb_flags; 535 to->sb_shared_vn = from->sb_shared_vn; 536 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); 537 to->sb_unit = cpu_to_be32(from->sb_unit); 538 to->sb_width = cpu_to_be32(from->sb_width); 539 to->sb_dirblklog = from->sb_dirblklog; 540 to->sb_logsectlog = from->sb_logsectlog; 541 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); 542 to->sb_logsunit = cpu_to_be32(from->sb_logsunit); 543 544 /* 545 * We need to ensure that bad_features2 always matches features2. 546 * Hence we enforce that here rather than having to remember to do it 547 * everywhere else that updates features2. 548 */ 549 from->sb_bad_features2 = from->sb_features2; 550 to->sb_features2 = cpu_to_be32(from->sb_features2); 551 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); 552 553 if (xfs_sb_version_hascrc(from)) { 554 to->sb_features_compat = cpu_to_be32(from->sb_features_compat); 555 to->sb_features_ro_compat = 556 cpu_to_be32(from->sb_features_ro_compat); 557 to->sb_features_incompat = 558 cpu_to_be32(from->sb_features_incompat); 559 to->sb_features_log_incompat = 560 cpu_to_be32(from->sb_features_log_incompat); 561 to->sb_spino_align = cpu_to_be32(from->sb_spino_align); 562 to->sb_lsn = cpu_to_be64(from->sb_lsn); 563 if (xfs_sb_version_hasmetauuid(from)) 564 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); 565 } 566 } 567 568 static int 569 xfs_sb_verify( 570 struct xfs_buf *bp, 571 bool check_version) 572 { 573 struct xfs_mount *mp = bp->b_target->bt_mount; 574 struct xfs_sb sb; 575 576 /* 577 * Use call variant which doesn't convert quota flags from disk 578 * format, because xfs_mount_validate_sb checks the on-disk flags. 579 */ 580 __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false); 581 582 /* 583 * Only check the in progress field for the primary superblock as 584 * mkfs.xfs doesn't clear it from secondary superblocks. 585 */ 586 return xfs_mount_validate_sb(mp, &sb, 587 bp->b_maps[0].bm_bn == XFS_SB_DADDR, 588 check_version); 589 } 590 591 /* 592 * If the superblock has the CRC feature bit set or the CRC field is non-null, 593 * check that the CRC is valid. We check the CRC field is non-null because a 594 * single bit error could clear the feature bit and unused parts of the 595 * superblock are supposed to be zero. Hence a non-null crc field indicates that 596 * we've potentially lost a feature bit and we should check it anyway. 597 * 598 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 599 * last field in V4 secondary superblocks. So for secondary superblocks, 600 * we are more forgiving, and ignore CRC failures if the primary doesn't 601 * indicate that the fs version is V5. 602 */ 603 static void 604 xfs_sb_read_verify( 605 struct xfs_buf *bp) 606 { 607 struct xfs_mount *mp = bp->b_target->bt_mount; 608 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); 609 int error; 610 611 /* 612 * open code the version check to avoid needing to convert the entire 613 * superblock from disk order just to check the version number 614 */ 615 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 616 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 617 XFS_SB_VERSION_5) || 618 dsb->sb_crc != 0)) { 619 620 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 621 /* Only fail bad secondaries on a known V5 filesystem */ 622 if (bp->b_bn == XFS_SB_DADDR || 623 xfs_sb_version_hascrc(&mp->m_sb)) { 624 error = -EFSBADCRC; 625 goto out_error; 626 } 627 } 628 } 629 error = xfs_sb_verify(bp, true); 630 631 out_error: 632 if (error) { 633 xfs_buf_ioerror(bp, error); 634 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 635 xfs_verifier_error(bp); 636 } 637 } 638 639 /* 640 * We may be probed for a filesystem match, so we may not want to emit 641 * messages when the superblock buffer is not actually an XFS superblock. 642 * If we find an XFS superblock, then run a normal, noisy mount because we are 643 * really going to mount it and want to know about errors. 644 */ 645 static void 646 xfs_sb_quiet_read_verify( 647 struct xfs_buf *bp) 648 { 649 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); 650 651 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 652 /* XFS filesystem, verify noisily! */ 653 xfs_sb_read_verify(bp); 654 return; 655 } 656 /* quietly fail */ 657 xfs_buf_ioerror(bp, -EWRONGFS); 658 } 659 660 static void 661 xfs_sb_write_verify( 662 struct xfs_buf *bp) 663 { 664 struct xfs_mount *mp = bp->b_target->bt_mount; 665 struct xfs_buf_log_item *bip = bp->b_fspriv; 666 int error; 667 668 error = xfs_sb_verify(bp, false); 669 if (error) { 670 xfs_buf_ioerror(bp, error); 671 xfs_verifier_error(bp); 672 return; 673 } 674 675 if (!xfs_sb_version_hascrc(&mp->m_sb)) 676 return; 677 678 if (bip) 679 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 680 681 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 682 } 683 684 const struct xfs_buf_ops xfs_sb_buf_ops = { 685 .name = "xfs_sb", 686 .verify_read = xfs_sb_read_verify, 687 .verify_write = xfs_sb_write_verify, 688 }; 689 690 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 691 .name = "xfs_sb_quiet", 692 .verify_read = xfs_sb_quiet_read_verify, 693 .verify_write = xfs_sb_write_verify, 694 }; 695 696 /* 697 * xfs_mount_common 698 * 699 * Mount initialization code establishing various mount 700 * fields from the superblock associated with the given 701 * mount structure 702 */ 703 void 704 xfs_sb_mount_common( 705 struct xfs_mount *mp, 706 struct xfs_sb *sbp) 707 { 708 mp->m_agfrotor = mp->m_agirotor = 0; 709 spin_lock_init(&mp->m_agirotor_lock); 710 mp->m_maxagi = mp->m_sb.sb_agcount; 711 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 712 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 713 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 714 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 715 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; 716 mp->m_blockmask = sbp->sb_blocksize - 1; 717 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 718 mp->m_blockwmask = mp->m_blockwsize - 1; 719 720 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 721 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 722 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 723 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 724 725 mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); 726 mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); 727 mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; 728 mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; 729 730 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 731 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 732 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 733 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 734 735 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, 1); 736 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, 0); 737 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; 738 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; 739 740 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 741 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, 742 sbp->sb_inopblock); 743 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; 744 745 if (sbp->sb_spino_align) 746 mp->m_ialloc_min_blks = sbp->sb_spino_align; 747 else 748 mp->m_ialloc_min_blks = mp->m_ialloc_blks; 749 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 750 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp); 751 } 752 753 /* 754 * xfs_initialize_perag_data 755 * 756 * Read in each per-ag structure so we can count up the number of 757 * allocated inodes, free inodes and used filesystem blocks as this 758 * information is no longer persistent in the superblock. Once we have 759 * this information, write it into the in-core superblock structure. 760 */ 761 int 762 xfs_initialize_perag_data( 763 struct xfs_mount *mp, 764 xfs_agnumber_t agcount) 765 { 766 xfs_agnumber_t index; 767 xfs_perag_t *pag; 768 xfs_sb_t *sbp = &mp->m_sb; 769 uint64_t ifree = 0; 770 uint64_t ialloc = 0; 771 uint64_t bfree = 0; 772 uint64_t bfreelst = 0; 773 uint64_t btree = 0; 774 int error; 775 776 for (index = 0; index < agcount; index++) { 777 /* 778 * read the agf, then the agi. This gets us 779 * all the information we need and populates the 780 * per-ag structures for us. 781 */ 782 error = xfs_alloc_pagf_init(mp, NULL, index, 0); 783 if (error) 784 return error; 785 786 error = xfs_ialloc_pagi_init(mp, NULL, index); 787 if (error) 788 return error; 789 pag = xfs_perag_get(mp, index); 790 ifree += pag->pagi_freecount; 791 ialloc += pag->pagi_count; 792 bfree += pag->pagf_freeblks; 793 bfreelst += pag->pagf_flcount; 794 btree += pag->pagf_btreeblks; 795 xfs_perag_put(pag); 796 } 797 798 /* Overwrite incore superblock counters with just-read data */ 799 spin_lock(&mp->m_sb_lock); 800 sbp->sb_ifree = ifree; 801 sbp->sb_icount = ialloc; 802 sbp->sb_fdblocks = bfree + bfreelst + btree; 803 spin_unlock(&mp->m_sb_lock); 804 805 xfs_reinit_percpu_counters(mp); 806 807 return 0; 808 } 809 810 /* 811 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock 812 * into the superblock buffer to be logged. It does not provide the higher 813 * level of locking that is needed to protect the in-core superblock from 814 * concurrent access. 815 */ 816 void 817 xfs_log_sb( 818 struct xfs_trans *tp) 819 { 820 struct xfs_mount *mp = tp->t_mountp; 821 struct xfs_buf *bp = xfs_trans_getsb(tp, mp, 0); 822 823 mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); 824 mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree); 825 mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); 826 827 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); 828 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 829 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb)); 830 } 831 832 /* 833 * xfs_sync_sb 834 * 835 * Sync the superblock to disk. 836 * 837 * Note that the caller is responsible for checking the frozen state of the 838 * filesystem. This procedure uses the non-blocking transaction allocator and 839 * thus will allow modifications to a frozen fs. This is required because this 840 * code can be called during the process of freezing where use of the high-level 841 * allocator would deadlock. 842 */ 843 int 844 xfs_sync_sb( 845 struct xfs_mount *mp, 846 bool wait) 847 { 848 struct xfs_trans *tp; 849 int error; 850 851 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 852 XFS_TRANS_NO_WRITECOUNT, &tp); 853 if (error) 854 return error; 855 856 xfs_log_sb(tp); 857 if (wait) 858 xfs_trans_set_sync(tp); 859 return xfs_trans_commit(tp); 860 } 861