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_ag.h" 27 #include "xfs_mount.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_dinode.h" 37 #include "xfs_bmap_btree.h" 38 #include "xfs_alloc_btree.h" 39 #include "xfs_ialloc_btree.h" 40 41 /* 42 * Physical superblock buffer manipulations. Shared with libxfs in userspace. 43 */ 44 45 static const struct { 46 short offset; 47 short type; /* 0 = integer 48 * 1 = binary / string (no translation) 49 */ 50 } xfs_sb_info[] = { 51 { offsetof(xfs_sb_t, sb_magicnum), 0 }, 52 { offsetof(xfs_sb_t, sb_blocksize), 0 }, 53 { offsetof(xfs_sb_t, sb_dblocks), 0 }, 54 { offsetof(xfs_sb_t, sb_rblocks), 0 }, 55 { offsetof(xfs_sb_t, sb_rextents), 0 }, 56 { offsetof(xfs_sb_t, sb_uuid), 1 }, 57 { offsetof(xfs_sb_t, sb_logstart), 0 }, 58 { offsetof(xfs_sb_t, sb_rootino), 0 }, 59 { offsetof(xfs_sb_t, sb_rbmino), 0 }, 60 { offsetof(xfs_sb_t, sb_rsumino), 0 }, 61 { offsetof(xfs_sb_t, sb_rextsize), 0 }, 62 { offsetof(xfs_sb_t, sb_agblocks), 0 }, 63 { offsetof(xfs_sb_t, sb_agcount), 0 }, 64 { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, 65 { offsetof(xfs_sb_t, sb_logblocks), 0 }, 66 { offsetof(xfs_sb_t, sb_versionnum), 0 }, 67 { offsetof(xfs_sb_t, sb_sectsize), 0 }, 68 { offsetof(xfs_sb_t, sb_inodesize), 0 }, 69 { offsetof(xfs_sb_t, sb_inopblock), 0 }, 70 { offsetof(xfs_sb_t, sb_fname[0]), 1 }, 71 { offsetof(xfs_sb_t, sb_blocklog), 0 }, 72 { offsetof(xfs_sb_t, sb_sectlog), 0 }, 73 { offsetof(xfs_sb_t, sb_inodelog), 0 }, 74 { offsetof(xfs_sb_t, sb_inopblog), 0 }, 75 { offsetof(xfs_sb_t, sb_agblklog), 0 }, 76 { offsetof(xfs_sb_t, sb_rextslog), 0 }, 77 { offsetof(xfs_sb_t, sb_inprogress), 0 }, 78 { offsetof(xfs_sb_t, sb_imax_pct), 0 }, 79 { offsetof(xfs_sb_t, sb_icount), 0 }, 80 { offsetof(xfs_sb_t, sb_ifree), 0 }, 81 { offsetof(xfs_sb_t, sb_fdblocks), 0 }, 82 { offsetof(xfs_sb_t, sb_frextents), 0 }, 83 { offsetof(xfs_sb_t, sb_uquotino), 0 }, 84 { offsetof(xfs_sb_t, sb_gquotino), 0 }, 85 { offsetof(xfs_sb_t, sb_qflags), 0 }, 86 { offsetof(xfs_sb_t, sb_flags), 0 }, 87 { offsetof(xfs_sb_t, sb_shared_vn), 0 }, 88 { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, 89 { offsetof(xfs_sb_t, sb_unit), 0 }, 90 { offsetof(xfs_sb_t, sb_width), 0 }, 91 { offsetof(xfs_sb_t, sb_dirblklog), 0 }, 92 { offsetof(xfs_sb_t, sb_logsectlog), 0 }, 93 { offsetof(xfs_sb_t, sb_logsectsize), 0 }, 94 { offsetof(xfs_sb_t, sb_logsunit), 0 }, 95 { offsetof(xfs_sb_t, sb_features2), 0 }, 96 { offsetof(xfs_sb_t, sb_bad_features2), 0 }, 97 { offsetof(xfs_sb_t, sb_features_compat), 0 }, 98 { offsetof(xfs_sb_t, sb_features_ro_compat), 0 }, 99 { offsetof(xfs_sb_t, sb_features_incompat), 0 }, 100 { offsetof(xfs_sb_t, sb_features_log_incompat), 0 }, 101 { offsetof(xfs_sb_t, sb_crc), 0 }, 102 { offsetof(xfs_sb_t, sb_pad), 0 }, 103 { offsetof(xfs_sb_t, sb_pquotino), 0 }, 104 { offsetof(xfs_sb_t, sb_lsn), 0 }, 105 { sizeof(xfs_sb_t), 0 } 106 }; 107 108 /* 109 * Reference counting access wrappers to the perag structures. 110 * Because we never free per-ag structures, the only thing we 111 * have to protect against changes is the tree structure itself. 112 */ 113 struct xfs_perag * 114 xfs_perag_get( 115 struct xfs_mount *mp, 116 xfs_agnumber_t agno) 117 { 118 struct xfs_perag *pag; 119 int ref = 0; 120 121 rcu_read_lock(); 122 pag = radix_tree_lookup(&mp->m_perag_tree, agno); 123 if (pag) { 124 ASSERT(atomic_read(&pag->pag_ref) >= 0); 125 ref = atomic_inc_return(&pag->pag_ref); 126 } 127 rcu_read_unlock(); 128 trace_xfs_perag_get(mp, agno, ref, _RET_IP_); 129 return pag; 130 } 131 132 /* 133 * search from @first to find the next perag with the given tag set. 134 */ 135 struct xfs_perag * 136 xfs_perag_get_tag( 137 struct xfs_mount *mp, 138 xfs_agnumber_t first, 139 int tag) 140 { 141 struct xfs_perag *pag; 142 int found; 143 int ref; 144 145 rcu_read_lock(); 146 found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, 147 (void **)&pag, first, 1, tag); 148 if (found <= 0) { 149 rcu_read_unlock(); 150 return NULL; 151 } 152 ref = atomic_inc_return(&pag->pag_ref); 153 rcu_read_unlock(); 154 trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); 155 return pag; 156 } 157 158 void 159 xfs_perag_put( 160 struct xfs_perag *pag) 161 { 162 int ref; 163 164 ASSERT(atomic_read(&pag->pag_ref) > 0); 165 ref = atomic_dec_return(&pag->pag_ref); 166 trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); 167 } 168 169 /* 170 * Check the validity of the SB found. 171 */ 172 STATIC int 173 xfs_mount_validate_sb( 174 xfs_mount_t *mp, 175 xfs_sb_t *sbp, 176 bool check_inprogress, 177 bool check_version) 178 { 179 180 /* 181 * If the log device and data device have the 182 * same device number, the log is internal. 183 * Consequently, the sb_logstart should be non-zero. If 184 * we have a zero sb_logstart in this case, we may be trying to mount 185 * a volume filesystem in a non-volume manner. 186 */ 187 if (sbp->sb_magicnum != XFS_SB_MAGIC) { 188 xfs_warn(mp, "bad magic number"); 189 return -EWRONGFS; 190 } 191 192 193 if (!xfs_sb_good_version(sbp)) { 194 xfs_warn(mp, "bad version"); 195 return -EWRONGFS; 196 } 197 198 /* 199 * Version 5 superblock feature mask validation. Reject combinations the 200 * kernel cannot support up front before checking anything else. For 201 * write validation, we don't need to check feature masks. 202 */ 203 if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { 204 if (xfs_sb_has_compat_feature(sbp, 205 XFS_SB_FEAT_COMPAT_UNKNOWN)) { 206 xfs_warn(mp, 207 "Superblock has unknown compatible features (0x%x) enabled.\n" 208 "Using a more recent kernel is recommended.", 209 (sbp->sb_features_compat & 210 XFS_SB_FEAT_COMPAT_UNKNOWN)); 211 } 212 213 if (xfs_sb_has_ro_compat_feature(sbp, 214 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 215 xfs_alert(mp, 216 "Superblock has unknown read-only compatible features (0x%x) enabled.", 217 (sbp->sb_features_ro_compat & 218 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 219 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { 220 xfs_warn(mp, 221 "Attempted to mount read-only compatible filesystem read-write.\n" 222 "Filesystem can only be safely mounted read only."); 223 return -EINVAL; 224 } 225 } 226 if (xfs_sb_has_incompat_feature(sbp, 227 XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { 228 xfs_warn(mp, 229 "Superblock has unknown incompatible features (0x%x) enabled.\n" 230 "Filesystem can not be safely mounted by this kernel.", 231 (sbp->sb_features_incompat & 232 XFS_SB_FEAT_INCOMPAT_UNKNOWN)); 233 return -EINVAL; 234 } 235 } 236 237 if (xfs_sb_version_has_pquotino(sbp)) { 238 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { 239 xfs_notice(mp, 240 "Version 5 of Super block has XFS_OQUOTA bits."); 241 return -EFSCORRUPTED; 242 } 243 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | 244 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { 245 xfs_notice(mp, 246 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits."); 247 return -EFSCORRUPTED; 248 } 249 250 if (unlikely( 251 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 252 xfs_warn(mp, 253 "filesystem is marked as having an external log; " 254 "specify logdev on the mount command line."); 255 return -EINVAL; 256 } 257 258 if (unlikely( 259 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 260 xfs_warn(mp, 261 "filesystem is marked as having an internal log; " 262 "do not specify logdev on the mount command line."); 263 return -EINVAL; 264 } 265 266 /* 267 * More sanity checking. Most of these were stolen directly from 268 * xfs_repair. 269 */ 270 if (unlikely( 271 sbp->sb_agcount <= 0 || 272 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 273 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 274 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 275 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 276 sbp->sb_sectsize != (1 << sbp->sb_sectlog) || 277 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 278 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 279 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 280 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 281 sbp->sb_blocksize != (1 << sbp->sb_blocklog) || 282 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 283 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 284 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 285 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 286 sbp->sb_inodesize != (1 << sbp->sb_inodelog) || 287 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || 288 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 289 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 290 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 291 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || 292 sbp->sb_dblocks == 0 || 293 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || 294 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || 295 sbp->sb_shared_vn != 0)) { 296 xfs_notice(mp, "SB sanity check failed"); 297 return -EFSCORRUPTED; 298 } 299 300 /* 301 * Until this is fixed only page-sized or smaller data blocks work. 302 */ 303 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { 304 xfs_warn(mp, 305 "File system with blocksize %d bytes. " 306 "Only pagesize (%ld) or less will currently work.", 307 sbp->sb_blocksize, PAGE_SIZE); 308 return -ENOSYS; 309 } 310 311 /* 312 * Currently only very few inode sizes are supported. 313 */ 314 switch (sbp->sb_inodesize) { 315 case 256: 316 case 512: 317 case 1024: 318 case 2048: 319 break; 320 default: 321 xfs_warn(mp, "inode size of %d bytes not supported", 322 sbp->sb_inodesize); 323 return -ENOSYS; 324 } 325 326 if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || 327 xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { 328 xfs_warn(mp, 329 "file system too large to be mounted on this system."); 330 return -EFBIG; 331 } 332 333 if (check_inprogress && sbp->sb_inprogress) { 334 xfs_warn(mp, "Offline file system operation in progress!"); 335 return -EFSCORRUPTED; 336 } 337 return 0; 338 } 339 340 void 341 xfs_sb_quota_from_disk(struct xfs_sb *sbp) 342 { 343 /* 344 * older mkfs doesn't initialize quota inodes to NULLFSINO. This 345 * leads to in-core values having two different values for a quota 346 * inode to be invalid: 0 and NULLFSINO. Change it to a single value 347 * NULLFSINO. 348 * 349 * Note that this change affect only the in-core values. These 350 * values are not written back to disk unless any quota information 351 * is written to the disk. Even in that case, sb_pquotino field is 352 * not written to disk unless the superblock supports pquotino. 353 */ 354 if (sbp->sb_uquotino == 0) 355 sbp->sb_uquotino = NULLFSINO; 356 if (sbp->sb_gquotino == 0) 357 sbp->sb_gquotino = NULLFSINO; 358 if (sbp->sb_pquotino == 0) 359 sbp->sb_pquotino = NULLFSINO; 360 361 /* 362 * We need to do these manipilations only if we are working 363 * with an older version of on-disk superblock. 364 */ 365 if (xfs_sb_version_has_pquotino(sbp)) 366 return; 367 368 if (sbp->sb_qflags & XFS_OQUOTA_ENFD) 369 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 370 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; 371 if (sbp->sb_qflags & XFS_OQUOTA_CHKD) 372 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? 373 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; 374 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); 375 376 if (sbp->sb_qflags & XFS_PQUOTA_ACCT) { 377 /* 378 * In older version of superblock, on-disk superblock only 379 * has sb_gquotino, and in-core superblock has both sb_gquotino 380 * and sb_pquotino. But, only one of them is supported at any 381 * point of time. So, if PQUOTA is set in disk superblock, 382 * copy over sb_gquotino to sb_pquotino. 383 */ 384 sbp->sb_pquotino = sbp->sb_gquotino; 385 sbp->sb_gquotino = NULLFSINO; 386 } 387 } 388 389 static void 390 __xfs_sb_from_disk( 391 struct xfs_sb *to, 392 xfs_dsb_t *from, 393 bool convert_xquota) 394 { 395 to->sb_magicnum = be32_to_cpu(from->sb_magicnum); 396 to->sb_blocksize = be32_to_cpu(from->sb_blocksize); 397 to->sb_dblocks = be64_to_cpu(from->sb_dblocks); 398 to->sb_rblocks = be64_to_cpu(from->sb_rblocks); 399 to->sb_rextents = be64_to_cpu(from->sb_rextents); 400 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); 401 to->sb_logstart = be64_to_cpu(from->sb_logstart); 402 to->sb_rootino = be64_to_cpu(from->sb_rootino); 403 to->sb_rbmino = be64_to_cpu(from->sb_rbmino); 404 to->sb_rsumino = be64_to_cpu(from->sb_rsumino); 405 to->sb_rextsize = be32_to_cpu(from->sb_rextsize); 406 to->sb_agblocks = be32_to_cpu(from->sb_agblocks); 407 to->sb_agcount = be32_to_cpu(from->sb_agcount); 408 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); 409 to->sb_logblocks = be32_to_cpu(from->sb_logblocks); 410 to->sb_versionnum = be16_to_cpu(from->sb_versionnum); 411 to->sb_sectsize = be16_to_cpu(from->sb_sectsize); 412 to->sb_inodesize = be16_to_cpu(from->sb_inodesize); 413 to->sb_inopblock = be16_to_cpu(from->sb_inopblock); 414 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); 415 to->sb_blocklog = from->sb_blocklog; 416 to->sb_sectlog = from->sb_sectlog; 417 to->sb_inodelog = from->sb_inodelog; 418 to->sb_inopblog = from->sb_inopblog; 419 to->sb_agblklog = from->sb_agblklog; 420 to->sb_rextslog = from->sb_rextslog; 421 to->sb_inprogress = from->sb_inprogress; 422 to->sb_imax_pct = from->sb_imax_pct; 423 to->sb_icount = be64_to_cpu(from->sb_icount); 424 to->sb_ifree = be64_to_cpu(from->sb_ifree); 425 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); 426 to->sb_frextents = be64_to_cpu(from->sb_frextents); 427 to->sb_uquotino = be64_to_cpu(from->sb_uquotino); 428 to->sb_gquotino = be64_to_cpu(from->sb_gquotino); 429 to->sb_qflags = be16_to_cpu(from->sb_qflags); 430 to->sb_flags = from->sb_flags; 431 to->sb_shared_vn = from->sb_shared_vn; 432 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); 433 to->sb_unit = be32_to_cpu(from->sb_unit); 434 to->sb_width = be32_to_cpu(from->sb_width); 435 to->sb_dirblklog = from->sb_dirblklog; 436 to->sb_logsectlog = from->sb_logsectlog; 437 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); 438 to->sb_logsunit = be32_to_cpu(from->sb_logsunit); 439 to->sb_features2 = be32_to_cpu(from->sb_features2); 440 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); 441 to->sb_features_compat = be32_to_cpu(from->sb_features_compat); 442 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); 443 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); 444 to->sb_features_log_incompat = 445 be32_to_cpu(from->sb_features_log_incompat); 446 to->sb_pad = 0; 447 to->sb_pquotino = be64_to_cpu(from->sb_pquotino); 448 to->sb_lsn = be64_to_cpu(from->sb_lsn); 449 /* Convert on-disk flags to in-memory flags? */ 450 if (convert_xquota) 451 xfs_sb_quota_from_disk(to); 452 } 453 454 void 455 xfs_sb_from_disk( 456 struct xfs_sb *to, 457 xfs_dsb_t *from) 458 { 459 __xfs_sb_from_disk(to, from, true); 460 } 461 462 static inline void 463 xfs_sb_quota_to_disk( 464 xfs_dsb_t *to, 465 xfs_sb_t *from, 466 __int64_t *fields) 467 { 468 __uint16_t qflags = from->sb_qflags; 469 470 /* 471 * We need to do these manipilations only if we are working 472 * with an older version of on-disk superblock. 473 */ 474 if (xfs_sb_version_has_pquotino(from)) 475 return; 476 477 if (*fields & XFS_SB_QFLAGS) { 478 /* 479 * The in-core version of sb_qflags do not have 480 * XFS_OQUOTA_* flags, whereas the on-disk version 481 * does. So, convert incore XFS_{PG}QUOTA_* flags 482 * to on-disk XFS_OQUOTA_* flags. 483 */ 484 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | 485 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); 486 487 if (from->sb_qflags & 488 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) 489 qflags |= XFS_OQUOTA_ENFD; 490 if (from->sb_qflags & 491 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) 492 qflags |= XFS_OQUOTA_CHKD; 493 to->sb_qflags = cpu_to_be16(qflags); 494 *fields &= ~XFS_SB_QFLAGS; 495 } 496 497 /* 498 * GQUOTINO and PQUOTINO cannot be used together in versions of 499 * superblock that do not have pquotino. from->sb_flags tells us which 500 * quota is active and should be copied to disk. If neither are active, 501 * make sure we write NULLFSINO to the sb_gquotino field as a quota 502 * inode value of "0" is invalid when the XFS_SB_VERSION_QUOTA feature 503 * bit is set. 504 * 505 * Note that we don't need to handle the sb_uquotino or sb_pquotino here 506 * as they do not require any translation. Hence the main sb field loop 507 * will write them appropriately from the in-core superblock. 508 */ 509 if ((*fields & XFS_SB_GQUOTINO) && 510 (from->sb_qflags & XFS_GQUOTA_ACCT)) 511 to->sb_gquotino = cpu_to_be64(from->sb_gquotino); 512 else if ((*fields & XFS_SB_PQUOTINO) && 513 (from->sb_qflags & XFS_PQUOTA_ACCT)) 514 to->sb_gquotino = cpu_to_be64(from->sb_pquotino); 515 else { 516 /* 517 * We can't rely on just the fields being logged to tell us 518 * that it is safe to write NULLFSINO - we should only do that 519 * if quotas are not actually enabled. Hence only write 520 * NULLFSINO if both in-core quota inodes are NULL. 521 */ 522 if (from->sb_gquotino == NULLFSINO && 523 from->sb_pquotino == NULLFSINO) 524 to->sb_gquotino = cpu_to_be64(NULLFSINO); 525 } 526 527 *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO); 528 } 529 530 /* 531 * Copy in core superblock to ondisk one. 532 * 533 * The fields argument is mask of superblock fields to copy. 534 */ 535 void 536 xfs_sb_to_disk( 537 xfs_dsb_t *to, 538 xfs_sb_t *from, 539 __int64_t fields) 540 { 541 xfs_caddr_t to_ptr = (xfs_caddr_t)to; 542 xfs_caddr_t from_ptr = (xfs_caddr_t)from; 543 xfs_sb_field_t f; 544 int first; 545 int size; 546 547 ASSERT(fields); 548 if (!fields) 549 return; 550 551 xfs_sb_quota_to_disk(to, from, &fields); 552 while (fields) { 553 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); 554 first = xfs_sb_info[f].offset; 555 size = xfs_sb_info[f + 1].offset - first; 556 557 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); 558 559 if (size == 1 || xfs_sb_info[f].type == 1) { 560 memcpy(to_ptr + first, from_ptr + first, size); 561 } else { 562 switch (size) { 563 case 2: 564 *(__be16 *)(to_ptr + first) = 565 cpu_to_be16(*(__u16 *)(from_ptr + first)); 566 break; 567 case 4: 568 *(__be32 *)(to_ptr + first) = 569 cpu_to_be32(*(__u32 *)(from_ptr + first)); 570 break; 571 case 8: 572 *(__be64 *)(to_ptr + first) = 573 cpu_to_be64(*(__u64 *)(from_ptr + first)); 574 break; 575 default: 576 ASSERT(0); 577 } 578 } 579 580 fields &= ~(1LL << f); 581 } 582 } 583 584 static int 585 xfs_sb_verify( 586 struct xfs_buf *bp, 587 bool check_version) 588 { 589 struct xfs_mount *mp = bp->b_target->bt_mount; 590 struct xfs_sb sb; 591 592 /* 593 * Use call variant which doesn't convert quota flags from disk 594 * format, because xfs_mount_validate_sb checks the on-disk flags. 595 */ 596 __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false); 597 598 /* 599 * Only check the in progress field for the primary superblock as 600 * mkfs.xfs doesn't clear it from secondary superblocks. 601 */ 602 return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR, 603 check_version); 604 } 605 606 /* 607 * If the superblock has the CRC feature bit set or the CRC field is non-null, 608 * check that the CRC is valid. We check the CRC field is non-null because a 609 * single bit error could clear the feature bit and unused parts of the 610 * superblock are supposed to be zero. Hence a non-null crc field indicates that 611 * we've potentially lost a feature bit and we should check it anyway. 612 * 613 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the 614 * last field in V4 secondary superblocks. So for secondary superblocks, 615 * we are more forgiving, and ignore CRC failures if the primary doesn't 616 * indicate that the fs version is V5. 617 */ 618 static void 619 xfs_sb_read_verify( 620 struct xfs_buf *bp) 621 { 622 struct xfs_mount *mp = bp->b_target->bt_mount; 623 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); 624 int error; 625 626 /* 627 * open code the version check to avoid needing to convert the entire 628 * superblock from disk order just to check the version number 629 */ 630 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && 631 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == 632 XFS_SB_VERSION_5) || 633 dsb->sb_crc != 0)) { 634 635 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { 636 /* Only fail bad secondaries on a known V5 filesystem */ 637 if (bp->b_bn == XFS_SB_DADDR || 638 xfs_sb_version_hascrc(&mp->m_sb)) { 639 error = -EFSBADCRC; 640 goto out_error; 641 } 642 } 643 } 644 error = xfs_sb_verify(bp, true); 645 646 out_error: 647 if (error) { 648 xfs_buf_ioerror(bp, error); 649 if (error == -EFSCORRUPTED || error == -EFSBADCRC) 650 xfs_verifier_error(bp); 651 } 652 } 653 654 /* 655 * We may be probed for a filesystem match, so we may not want to emit 656 * messages when the superblock buffer is not actually an XFS superblock. 657 * If we find an XFS superblock, then run a normal, noisy mount because we are 658 * really going to mount it and want to know about errors. 659 */ 660 static void 661 xfs_sb_quiet_read_verify( 662 struct xfs_buf *bp) 663 { 664 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); 665 666 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { 667 /* XFS filesystem, verify noisily! */ 668 xfs_sb_read_verify(bp); 669 return; 670 } 671 /* quietly fail */ 672 xfs_buf_ioerror(bp, -EWRONGFS); 673 } 674 675 static void 676 xfs_sb_write_verify( 677 struct xfs_buf *bp) 678 { 679 struct xfs_mount *mp = bp->b_target->bt_mount; 680 struct xfs_buf_log_item *bip = bp->b_fspriv; 681 int error; 682 683 error = xfs_sb_verify(bp, false); 684 if (error) { 685 xfs_buf_ioerror(bp, error); 686 xfs_verifier_error(bp); 687 return; 688 } 689 690 if (!xfs_sb_version_hascrc(&mp->m_sb)) 691 return; 692 693 if (bip) 694 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); 695 696 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); 697 } 698 699 const struct xfs_buf_ops xfs_sb_buf_ops = { 700 .verify_read = xfs_sb_read_verify, 701 .verify_write = xfs_sb_write_verify, 702 }; 703 704 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { 705 .verify_read = xfs_sb_quiet_read_verify, 706 .verify_write = xfs_sb_write_verify, 707 }; 708 709 /* 710 * xfs_mount_common 711 * 712 * Mount initialization code establishing various mount 713 * fields from the superblock associated with the given 714 * mount structure 715 */ 716 void 717 xfs_sb_mount_common( 718 struct xfs_mount *mp, 719 struct xfs_sb *sbp) 720 { 721 mp->m_agfrotor = mp->m_agirotor = 0; 722 spin_lock_init(&mp->m_agirotor_lock); 723 mp->m_maxagi = mp->m_sb.sb_agcount; 724 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 725 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 726 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 727 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 728 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; 729 mp->m_blockmask = sbp->sb_blocksize - 1; 730 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 731 mp->m_blockwmask = mp->m_blockwsize - 1; 732 733 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); 734 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); 735 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; 736 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; 737 738 mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); 739 mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); 740 mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; 741 mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; 742 743 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); 744 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); 745 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; 746 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; 747 748 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 749 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, 750 sbp->sb_inopblock); 751 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; 752 } 753 754 /* 755 * xfs_initialize_perag_data 756 * 757 * Read in each per-ag structure so we can count up the number of 758 * allocated inodes, free inodes and used filesystem blocks as this 759 * information is no longer persistent in the superblock. Once we have 760 * this information, write it into the in-core superblock structure. 761 */ 762 int 763 xfs_initialize_perag_data( 764 struct xfs_mount *mp, 765 xfs_agnumber_t agcount) 766 { 767 xfs_agnumber_t index; 768 xfs_perag_t *pag; 769 xfs_sb_t *sbp = &mp->m_sb; 770 uint64_t ifree = 0; 771 uint64_t ialloc = 0; 772 uint64_t bfree = 0; 773 uint64_t bfreelst = 0; 774 uint64_t btree = 0; 775 int error; 776 777 for (index = 0; index < agcount; index++) { 778 /* 779 * read the agf, then the agi. This gets us 780 * all the information we need and populates the 781 * per-ag structures for us. 782 */ 783 error = xfs_alloc_pagf_init(mp, NULL, index, 0); 784 if (error) 785 return error; 786 787 error = xfs_ialloc_pagi_init(mp, NULL, index); 788 if (error) 789 return error; 790 pag = xfs_perag_get(mp, index); 791 ifree += pag->pagi_freecount; 792 ialloc += pag->pagi_count; 793 bfree += pag->pagf_freeblks; 794 bfreelst += pag->pagf_flcount; 795 btree += pag->pagf_btreeblks; 796 xfs_perag_put(pag); 797 } 798 /* 799 * Overwrite incore superblock counters with just-read data 800 */ 801 spin_lock(&mp->m_sb_lock); 802 sbp->sb_ifree = ifree; 803 sbp->sb_icount = ialloc; 804 sbp->sb_fdblocks = bfree + bfreelst + btree; 805 spin_unlock(&mp->m_sb_lock); 806 807 /* Fixup the per-cpu counters as well. */ 808 xfs_icsb_reinit_counters(mp); 809 810 return 0; 811 } 812 813 /* 814 * xfs_mod_sb() can be used to copy arbitrary changes to the 815 * in-core superblock into the superblock buffer to be logged. 816 * It does not provide the higher level of locking that is 817 * needed to protect the in-core superblock from concurrent 818 * access. 819 */ 820 void 821 xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) 822 { 823 xfs_buf_t *bp; 824 int first; 825 int last; 826 xfs_mount_t *mp; 827 xfs_sb_field_t f; 828 829 ASSERT(fields); 830 if (!fields) 831 return; 832 mp = tp->t_mountp; 833 bp = xfs_trans_getsb(tp, mp, 0); 834 first = sizeof(xfs_sb_t); 835 last = 0; 836 837 /* translate/copy */ 838 839 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); 840 841 /* find modified range */ 842 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); 843 ASSERT((1LL << f) & XFS_SB_MOD_BITS); 844 last = xfs_sb_info[f + 1].offset - 1; 845 846 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); 847 ASSERT((1LL << f) & XFS_SB_MOD_BITS); 848 first = xfs_sb_info[f].offset; 849 850 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); 851 xfs_trans_log_buf(tp, bp, first, last); 852 } 853