fs/xfs/libxfs/xfs_sb.c

   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 #include "xfs_bmap.h"
  42 #include "xfs_refcount_btree.h"
  43 #include "xfs_da_format.h"
  44 #include "xfs_da_btree.h"
  45
  46 /*
  47  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
  48  */
  49
  50 /*
  51  * Reference counting access wrappers to the perag structures.
  52  * Because we never free per-ag structures, the only thing we
  53  * have to protect against changes is the tree structure itself.
  54  */
  55 struct xfs_perag *
  56 xfs_perag_get(
  57         struct xfs_mount        *mp,
  58         xfs_agnumber_t          agno)
  59 {
  60         struct xfs_perag        *pag;
  61         int                     ref = 0;
  62
  63         rcu_read_lock();
  64         pag = radix_tree_lookup(&mp->m_perag_tree, agno);
  65         if (pag) {
  66                 ASSERT(atomic_read(&pag->pag_ref) >= 0);
  67                 ref = atomic_inc_return(&pag->pag_ref);
  68         }
  69         rcu_read_unlock();
  70         trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
  71         return pag;
  72 }
  73
  74 /*
  75  * search from @first to find the next perag with the given tag set.
  76  */
  77 struct xfs_perag *
  78 xfs_perag_get_tag(
  79         struct xfs_mount        *mp,
  80         xfs_agnumber_t          first,
  81         int                     tag)
  82 {
  83         struct xfs_perag        *pag;
  84         int                     found;
  85         int                     ref;
  86
  87         rcu_read_lock();
  88         found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
  89                                         (void **)&pag, first, 1, tag);
  90         if (found <= 0) {
  91                 rcu_read_unlock();
  92                 return NULL;
  93         }
  94         ref = atomic_inc_return(&pag->pag_ref);
  95         rcu_read_unlock();
  96         trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
  97         return pag;
  98 }
  99
 100 void
 101 xfs_perag_put(
 102         struct xfs_perag        *pag)
 103 {
 104         int     ref;
 105
 106         ASSERT(atomic_read(&pag->pag_ref) > 0);
 107         ref = atomic_dec_return(&pag->pag_ref);
 108         trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
 109 }
 110
 111 /*
 112  * Check the validity of the SB found.
 113  */
 114 STATIC int
 115 xfs_mount_validate_sb(
 116         xfs_mount_t     *mp,
 117         xfs_sb_t        *sbp,
 118         bool            check_inprogress,
 119         bool            check_version)
 120 {
 121         uint32_t        agcount = 0;
 122         uint32_t        rem;
 123
 124         if (sbp->sb_magicnum != XFS_SB_MAGIC) {
 125                 xfs_warn(mp, "bad magic number");
 126                 return -EWRONGFS;
 127         }
 128
 129
 130         if (!xfs_sb_good_version(sbp)) {
 131                 xfs_warn(mp, "bad version");
 132                 return -EWRONGFS;
 133         }
 134
 135         /*
 136          * Version 5 superblock feature mask validation. Reject combinations the
 137          * kernel cannot support up front before checking anything else. For
 138          * write validation, we don't need to check feature masks.
 139          */
 140         if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
 141                 if (xfs_sb_has_compat_feature(sbp,
 142                                         XFS_SB_FEAT_COMPAT_UNKNOWN)) {
 143                         xfs_warn(mp,
 144 "Superblock has unknown compatible features (0x%x) enabled.",
 145                                 (sbp->sb_features_compat &
 146                                                 XFS_SB_FEAT_COMPAT_UNKNOWN));
 147                         xfs_warn(mp,
 148 "Using a more recent kernel is recommended.");
 149                 }
 150
 151                 if (xfs_sb_has_ro_compat_feature(sbp,
 152                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
 153                         xfs_alert(mp,
 154 "Superblock has unknown read-only compatible features (0x%x) enabled.",
 155                                 (sbp->sb_features_ro_compat &
 156                                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
 157                         if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
 158                                 xfs_warn(mp,
 159 "Attempted to mount read-only compatible filesystem read-write.");
 160                                 xfs_warn(mp,
 161 "Filesystem can only be safely mounted read only.");
 162
 163                                 return -EINVAL;
 164                         }
 165                 }
 166                 if (xfs_sb_has_incompat_feature(sbp,
 167                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
 168                         xfs_warn(mp,
 169 "Superblock has unknown incompatible features (0x%x) enabled.",
 170                                 (sbp->sb_features_incompat &
 171                                                 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
 172                         xfs_warn(mp,
 173 "Filesystem can not be safely mounted by this kernel.");
 174                         return -EINVAL;
 175                 }
 176         } else if (xfs_sb_version_hascrc(sbp)) {
 177                 /*
 178                  * We can't read verify the sb LSN because the read verifier is
 179                  * called before the log is allocated and processed. We know the
 180                  * log is set up before write verifier (!check_version) calls,
 181                  * so just check it here.
 182                  */
 183                 if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
 184                         return -EFSCORRUPTED;
 185         }
 186
 187         if (xfs_sb_version_has_pquotino(sbp)) {
 188                 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
 189                         xfs_notice(mp,
 190                            "Version 5 of Super block has XFS_OQUOTA bits.");
 191                         return -EFSCORRUPTED;
 192                 }
 193         } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
 194                                 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
 195                         xfs_notice(mp,
 196 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
 197                         return -EFSCORRUPTED;
 198         }
 199
 200         /*
 201          * Full inode chunks must be aligned to inode chunk size when
 202          * sparse inodes are enabled to support the sparse chunk
 203          * allocation algorithm and prevent overlapping inode records.
 204          */
 205         if (xfs_sb_version_hassparseinodes(sbp)) {
 206                 uint32_t        align;
 207
 208                 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
 209                                 >> sbp->sb_blocklog;
 210                 if (sbp->sb_inoalignmt != align) {
 211                         xfs_warn(mp,
 212 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
 213                                  sbp->sb_inoalignmt, align);
 214                         return -EINVAL;
 215                 }
 216         }
 217
 218         if (unlikely(
 219             sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
 220                 xfs_warn(mp,
 221                 "filesystem is marked as having an external log; "
 222                 "specify logdev on the mount command line.");
 223                 return -EINVAL;
 224         }
 225
 226         if (unlikely(
 227             sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
 228                 xfs_warn(mp,
 229                 "filesystem is marked as having an internal log; "
 230                 "do not specify logdev on the mount command line.");
 231                 return -EINVAL;
 232         }
 233
 234         /* Compute agcount for this number of dblocks and agblocks */
 235         if (sbp->sb_agblocks) {
 236                 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
 237                 if (rem)
 238                         agcount++;
 239         }
 240
 241         /*
 242          * More sanity checking.  Most of these were stolen directly from
 243          * xfs_repair.
 244          */
 245         if (unlikely(
 246             sbp->sb_agcount <= 0                                        ||
 247             sbp->sb_sectsize < XFS_MIN_SECTORSIZE                       ||
 248             sbp->sb_sectsize > XFS_MAX_SECTORSIZE                       ||
 249             sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG                    ||
 250             sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG                    ||
 251             sbp->sb_sectsize != (1 << sbp->sb_sectlog)                  ||
 252             sbp->sb_blocksize < XFS_MIN_BLOCKSIZE                       ||
 253             sbp->sb_blocksize > XFS_MAX_BLOCKSIZE                       ||
 254             sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG                    ||
 255             sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG                    ||
 256             sbp->sb_blocksize != (1 << sbp->sb_blocklog)                ||
 257             sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
 258             sbp->sb_inodesize < XFS_DINODE_MIN_SIZE                     ||
 259             sbp->sb_inodesize > XFS_DINODE_MAX_SIZE                     ||
 260             sbp->sb_inodelog < XFS_DINODE_MIN_LOG                       ||
 261             sbp->sb_inodelog > XFS_DINODE_MAX_LOG                       ||
 262             sbp->sb_inodesize != (1 << sbp->sb_inodelog)                ||
 263             sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE                    ||
 264             sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
 265             XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES       ||
 266             XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES       ||
 267             sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
 268             agcount == 0 || agcount != sbp->sb_agcount                  ||
 269             (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog)   ||
 270             (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE)  ||
 271             (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)  ||
 272             (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */)    ||
 273             sbp->sb_dblocks == 0                                        ||
 274             sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
 275             sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)                      ||
 276             sbp->sb_shared_vn != 0)) {
 277                 xfs_notice(mp, "SB sanity check failed");
 278                 return -EFSCORRUPTED;
 279         }
 280
 281         if (xfs_sb_version_hascrc(&mp->m_sb) &&
 282             sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
 283                 xfs_notice(mp, "v5 SB sanity check failed");
 284                 return -EFSCORRUPTED;
 285         }
 286
 287         /*
 288          * Until this is fixed only page-sized or smaller data blocks work.
 289          */
 290         if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
 291                 xfs_warn(mp,
 292                 "File system with blocksize %d bytes. "
 293                 "Only pagesize (%ld) or less will currently work.",
 294                                 sbp->sb_blocksize, PAGE_SIZE);
 295                 return -ENOSYS;
 296         }
 297
 298         /*
 299          * Currently only very few inode sizes are supported.
 300          */
 301         switch (sbp->sb_inodesize) {
 302         case 256:
 303         case 512:
 304         case 1024:
 305         case 2048:
 306                 break;
 307         default:
 308                 xfs_warn(mp, "inode size of %d bytes not supported",
 309                                 sbp->sb_inodesize);
 310                 return -ENOSYS;
 311         }
 312
 313         if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
 314             xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
 315                 xfs_warn(mp,
 316                 "file system too large to be mounted on this system.");
 317                 return -EFBIG;
 318         }
 319
 320         if (check_inprogress && sbp->sb_inprogress) {
 321                 xfs_warn(mp, "Offline file system operation in progress!");
 322                 return -EFSCORRUPTED;
 323         }
 324         return 0;
 325 }
 326
 327 void
 328 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 329 {
 330         /*
 331          * older mkfs doesn't initialize quota inodes to NULLFSINO. This
 332          * leads to in-core values having two different values for a quota
 333          * inode to be invalid: 0 and NULLFSINO. Change it to a single value
 334          * NULLFSINO.
 335          *
 336          * Note that this change affect only the in-core values. These
 337          * values are not written back to disk unless any quota information
 338          * is written to the disk. Even in that case, sb_pquotino field is
 339          * not written to disk unless the superblock supports pquotino.
 340          */
 341         if (sbp->sb_uquotino == 0)
 342                 sbp->sb_uquotino = NULLFSINO;
 343         if (sbp->sb_gquotino == 0)
 344                 sbp->sb_gquotino = NULLFSINO;
 345         if (sbp->sb_pquotino == 0)
 346                 sbp->sb_pquotino = NULLFSINO;
 347
 348         /*
 349          * We need to do these manipilations only if we are working
 350          * with an older version of on-disk superblock.
 351          */
 352         if (xfs_sb_version_has_pquotino(sbp))
 353                 return;
 354
 355         if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
 356                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 357                                         XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
 358         if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
 359                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
 360                                         XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
 361         sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
 362
 363         if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
 364             sbp->sb_gquotino != NULLFSINO)  {
 365                 /*
 366                  * In older version of superblock, on-disk superblock only
 367                  * has sb_gquotino, and in-core superblock has both sb_gquotino
 368                  * and sb_pquotino. But, only one of them is supported at any
 369                  * point of time. So, if PQUOTA is set in disk superblock,
 370                  * copy over sb_gquotino to sb_pquotino.  The NULLFSINO test
 371                  * above is to make sure we don't do this twice and wipe them
 372                  * both out!
 373                  */
 374                 sbp->sb_pquotino = sbp->sb_gquotino;
 375                 sbp->sb_gquotino = NULLFSINO;
 376         }
 377 }
 378
 379 static void
 380 __xfs_sb_from_disk(
 381         struct xfs_sb   *to,
 382         xfs_dsb_t       *from,
 383         bool            convert_xquota)
 384 {
 385         to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
 386         to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
 387         to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
 388         to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
 389         to->sb_rextents = be64_to_cpu(from->sb_rextents);
 390         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 391         to->sb_logstart = be64_to_cpu(from->sb_logstart);
 392         to->sb_rootino = be64_to_cpu(from->sb_rootino);
 393         to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
 394         to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
 395         to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
 396         to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
 397         to->sb_agcount = be32_to_cpu(from->sb_agcount);
 398         to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
 399         to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
 400         to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
 401         to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
 402         to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
 403         to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
 404         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 405         to->sb_blocklog = from->sb_blocklog;
 406         to->sb_sectlog = from->sb_sectlog;
 407         to->sb_inodelog = from->sb_inodelog;
 408         to->sb_inopblog = from->sb_inopblog;
 409         to->sb_agblklog = from->sb_agblklog;
 410         to->sb_rextslog = from->sb_rextslog;
 411         to->sb_inprogress = from->sb_inprogress;
 412         to->sb_imax_pct = from->sb_imax_pct;
 413         to->sb_icount = be64_to_cpu(from->sb_icount);
 414         to->sb_ifree = be64_to_cpu(from->sb_ifree);
 415         to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
 416         to->sb_frextents = be64_to_cpu(from->sb_frextents);
 417         to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
 418         to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
 419         to->sb_qflags = be16_to_cpu(from->sb_qflags);
 420         to->sb_flags = from->sb_flags;
 421         to->sb_shared_vn = from->sb_shared_vn;
 422         to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
 423         to->sb_unit = be32_to_cpu(from->sb_unit);
 424         to->sb_width = be32_to_cpu(from->sb_width);
 425         to->sb_dirblklog = from->sb_dirblklog;
 426         to->sb_logsectlog = from->sb_logsectlog;
 427         to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
 428         to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
 429         to->sb_features2 = be32_to_cpu(from->sb_features2);
 430         to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
 431         to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
 432         to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
 433         to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
 434         to->sb_features_log_incompat =
 435                                 be32_to_cpu(from->sb_features_log_incompat);
 436         /* crc is only used on disk, not in memory; just init to 0 here. */
 437         to->sb_crc = 0;
 438         to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
 439         to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
 440         to->sb_lsn = be64_to_cpu(from->sb_lsn);
 441         /*
 442          * sb_meta_uuid is only on disk if it differs from sb_uuid and the
 443          * feature flag is set; if not set we keep it only in memory.
 444          */
 445         if (xfs_sb_version_hasmetauuid(to))
 446                 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 447         else
 448                 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
 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 void
 463 xfs_sb_quota_to_disk(
 464         struct xfs_dsb  *to,
 465         struct xfs_sb   *from)
 466 {
 467         uint16_t        qflags = from->sb_qflags;
 468
 469         to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
 470         if (xfs_sb_version_has_pquotino(from)) {
 471                 to->sb_qflags = cpu_to_be16(from->sb_qflags);
 472                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 473                 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
 474                 return;
 475         }
 476
 477         /*
 478          * The in-core version of sb_qflags do not have XFS_OQUOTA_*
 479          * flags, whereas the on-disk version does.  So, convert incore
 480          * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
 481          */
 482         qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
 483                         XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
 484
 485         if (from->sb_qflags &
 486                         (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
 487                 qflags |= XFS_OQUOTA_ENFD;
 488         if (from->sb_qflags &
 489                         (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
 490                 qflags |= XFS_OQUOTA_CHKD;
 491         to->sb_qflags = cpu_to_be16(qflags);
 492
 493         /*
 494          * GQUOTINO and PQUOTINO cannot be used together in versions
 495          * of superblock that do not have pquotino. from->sb_flags
 496          * tells us which quota is active and should be copied to
 497          * disk. If neither are active, we should NULL the inode.
 498          *
 499          * In all cases, the separate pquotino must remain 0 because it
 500          * it beyond the "end" of the valid non-pquotino superblock.
 501          */
 502         if (from->sb_qflags & XFS_GQUOTA_ACCT)
 503                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
 504         else if (from->sb_qflags & XFS_PQUOTA_ACCT)
 505                 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
 506         else {
 507                 /*
 508                  * We can't rely on just the fields being logged to tell us
 509                  * that it is safe to write NULLFSINO - we should only do that
 510                  * if quotas are not actually enabled. Hence only write
 511                  * NULLFSINO if both in-core quota inodes are NULL.
 512                  */
 513                 if (from->sb_gquotino == NULLFSINO &&
 514                     from->sb_pquotino == NULLFSINO)
 515                         to->sb_gquotino = cpu_to_be64(NULLFSINO);
 516         }
 517
 518         to->sb_pquotino = 0;
 519 }
 520
 521 void
 522 xfs_sb_to_disk(
 523         struct xfs_dsb  *to,
 524         struct xfs_sb   *from)
 525 {
 526         xfs_sb_quota_to_disk(to, from);
 527
 528         to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
 529         to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
 530         to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
 531         to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
 532         to->sb_rextents = cpu_to_be64(from->sb_rextents);
 533         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
 534         to->sb_logstart = cpu_to_be64(from->sb_logstart);
 535         to->sb_rootino = cpu_to_be64(from->sb_rootino);
 536         to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
 537         to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
 538         to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
 539         to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
 540         to->sb_agcount = cpu_to_be32(from->sb_agcount);
 541         to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
 542         to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
 543         to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
 544         to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
 545         to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
 546         to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
 547         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
 548         to->sb_blocklog = from->sb_blocklog;
 549         to->sb_sectlog = from->sb_sectlog;
 550         to->sb_inodelog = from->sb_inodelog;
 551         to->sb_inopblog = from->sb_inopblog;
 552         to->sb_agblklog = from->sb_agblklog;
 553         to->sb_rextslog = from->sb_rextslog;
 554         to->sb_inprogress = from->sb_inprogress;
 555         to->sb_imax_pct = from->sb_imax_pct;
 556         to->sb_icount = cpu_to_be64(from->sb_icount);
 557         to->sb_ifree = cpu_to_be64(from->sb_ifree);
 558         to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
 559         to->sb_frextents = cpu_to_be64(from->sb_frextents);
 560
 561         to->sb_flags = from->sb_flags;
 562         to->sb_shared_vn = from->sb_shared_vn;
 563         to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
 564         to->sb_unit = cpu_to_be32(from->sb_unit);
 565         to->sb_width = cpu_to_be32(from->sb_width);
 566         to->sb_dirblklog = from->sb_dirblklog;
 567         to->sb_logsectlog = from->sb_logsectlog;
 568         to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
 569         to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
 570
 571         /*
 572          * We need to ensure that bad_features2 always matches features2.
 573          * Hence we enforce that here rather than having to remember to do it
 574          * everywhere else that updates features2.
 575          */
 576         from->sb_bad_features2 = from->sb_features2;
 577         to->sb_features2 = cpu_to_be32(from->sb_features2);
 578         to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
 579
 580         if (xfs_sb_version_hascrc(from)) {
 581                 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
 582                 to->sb_features_ro_compat =
 583                                 cpu_to_be32(from->sb_features_ro_compat);
 584                 to->sb_features_incompat =
 585                                 cpu_to_be32(from->sb_features_incompat);
 586                 to->sb_features_log_incompat =
 587                                 cpu_to_be32(from->sb_features_log_incompat);
 588                 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
 589                 to->sb_lsn = cpu_to_be64(from->sb_lsn);
 590                 if (xfs_sb_version_hasmetauuid(from))
 591                         uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
 592         }
 593 }
 594
 595 static int
 596 xfs_sb_verify(
 597         struct xfs_buf  *bp,
 598         bool            check_version)
 599 {
 600         struct xfs_mount *mp = bp->b_target->bt_mount;
 601         struct xfs_sb   sb;
 602
 603         /*
 604          * Use call variant which doesn't convert quota flags from disk
 605          * format, because xfs_mount_validate_sb checks the on-disk flags.
 606          */
 607         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
 608
 609         /*
 610          * Only check the in progress field for the primary superblock as
 611          * mkfs.xfs doesn't clear it from secondary superblocks.
 612          */
 613         return xfs_mount_validate_sb(mp, &sb,
 614                                      bp->b_maps[0].bm_bn == XFS_SB_DADDR,
 615                                      check_version);
 616 }
 617
 618 /*
 619  * If the superblock has the CRC feature bit set or the CRC field is non-null,
 620  * check that the CRC is valid.  We check the CRC field is non-null because a
 621  * single bit error could clear the feature bit and unused parts of the
 622  * superblock are supposed to be zero. Hence a non-null crc field indicates that
 623  * we've potentially lost a feature bit and we should check it anyway.
 624  *
 625  * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
 626  * last field in V4 secondary superblocks.  So for secondary superblocks,
 627  * we are more forgiving, and ignore CRC failures if the primary doesn't
 628  * indicate that the fs version is V5.
 629  */
 630 static void
 631 xfs_sb_read_verify(
 632         struct xfs_buf  *bp)
 633 {
 634         struct xfs_mount *mp = bp->b_target->bt_mount;
 635         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
 636         int             error;
 637
 638         /*
 639          * open code the version check to avoid needing to convert the entire
 640          * superblock from disk order just to check the version number
 641          */
 642         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
 643             (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
 644                                                 XFS_SB_VERSION_5) ||
 645              dsb->sb_crc != 0)) {
 646
 647                 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
 648                         /* Only fail bad secondaries on a known V5 filesystem */
 649                         if (bp->b_bn == XFS_SB_DADDR ||
 650                             xfs_sb_version_hascrc(&mp->m_sb)) {
 651                                 error = -EFSBADCRC;
 652                                 goto out_error;
 653                         }
 654                 }
 655         }
 656         error = xfs_sb_verify(bp, true);
 657
 658 out_error:
 659         if (error == -EFSCORRUPTED || error == -EFSBADCRC)
 660                 xfs_verifier_error(bp, error, __this_address);
 661         else if (error)
 662                 xfs_buf_ioerror(bp, error);
 663 }
 664
 665 /*
 666  * We may be probed for a filesystem match, so we may not want to emit
 667  * messages when the superblock buffer is not actually an XFS superblock.
 668  * If we find an XFS superblock, then run a normal, noisy mount because we are
 669  * really going to mount it and want to know about errors.
 670  */
 671 static void
 672 xfs_sb_quiet_read_verify(
 673         struct xfs_buf  *bp)
 674 {
 675         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
 676
 677         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
 678                 /* XFS filesystem, verify noisily! */
 679                 xfs_sb_read_verify(bp);
 680                 return;
 681         }
 682         /* quietly fail */
 683         xfs_buf_ioerror(bp, -EWRONGFS);
 684 }
 685
 686 static void
 687 xfs_sb_write_verify(
 688         struct xfs_buf          *bp)
 689 {
 690         struct xfs_mount        *mp = bp->b_target->bt_mount;
 691         struct xfs_buf_log_item *bip = bp->b_log_item;
 692         int                     error;
 693
 694         error = xfs_sb_verify(bp, false);
 695         if (error) {
 696                 xfs_verifier_error(bp, error, __this_address);
 697                 return;
 698         }
 699
 700         if (!xfs_sb_version_hascrc(&mp->m_sb))
 701                 return;
 702
 703         if (bip)
 704                 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
 705
 706         xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
 707 }
 708
 709 const struct xfs_buf_ops xfs_sb_buf_ops = {
 710         .name = "xfs_sb",
 711         .verify_read = xfs_sb_read_verify,
 712         .verify_write = xfs_sb_write_verify,
 713 };
 714
 715 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
 716         .name = "xfs_sb_quiet",
 717         .verify_read = xfs_sb_quiet_read_verify,
 718         .verify_write = xfs_sb_write_verify,
 719 };
 720
 721 /*
 722  * xfs_mount_common
 723  *
 724  * Mount initialization code establishing various mount
 725  * fields from the superblock associated with the given
 726  * mount structure
 727  */
 728 void
 729 xfs_sb_mount_common(
 730         struct xfs_mount *mp,
 731         struct xfs_sb   *sbp)
 732 {
 733         mp->m_agfrotor = mp->m_agirotor = 0;
 734         mp->m_maxagi = mp->m_sb.sb_agcount;
 735         mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
 736         mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
 737         mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
 738         mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
 739         mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
 740         mp->m_blockmask = sbp->sb_blocksize - 1;
 741         mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
 742         mp->m_blockwmask = mp->m_blockwsize - 1;
 743
 744         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
 745         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
 746         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
 747         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
 748
 749         mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1);
 750         mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0);
 751         mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2;
 752         mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2;
 753
 754         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
 755         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
 756         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
 757         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
 758
 759         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
 760         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
 761         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
 762         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
 763
 764         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
 765         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
 766         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
 767         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
 768
 769         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
 770         mp->m_ialloc_inos = (int)MAX((uint16_t)XFS_INODES_PER_CHUNK,
 771                                         sbp->sb_inopblock);
 772         mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
 773
 774         if (sbp->sb_spino_align)
 775                 mp->m_ialloc_min_blks = sbp->sb_spino_align;
 776         else
 777                 mp->m_ialloc_min_blks = mp->m_ialloc_blks;
 778         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
 779         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
 780 }
 781
 782 /*
 783  * xfs_initialize_perag_data
 784  *
 785  * Read in each per-ag structure so we can count up the number of
 786  * allocated inodes, free inodes and used filesystem blocks as this
 787  * information is no longer persistent in the superblock. Once we have
 788  * this information, write it into the in-core superblock structure.
 789  */
 790 int
 791 xfs_initialize_perag_data(
 792         struct xfs_mount *mp,
 793         xfs_agnumber_t  agcount)
 794 {
 795         xfs_agnumber_t  index;
 796         xfs_perag_t     *pag;
 797         xfs_sb_t        *sbp = &mp->m_sb;
 798         uint64_t        ifree = 0;
 799         uint64_t        ialloc = 0;
 800         uint64_t        bfree = 0;
 801         uint64_t        bfreelst = 0;
 802         uint64_t        btree = 0;
 803         int             error;
 804
 805         for (index = 0; index < agcount; index++) {
 806                 /*
 807                  * read the agf, then the agi. This gets us
 808                  * all the information we need and populates the
 809                  * per-ag structures for us.
 810                  */
 811                 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
 812                 if (error)
 813                         return error;
 814
 815                 error = xfs_ialloc_pagi_init(mp, NULL, index);
 816                 if (error)
 817                         return error;
 818                 pag = xfs_perag_get(mp, index);
 819                 ifree += pag->pagi_freecount;
 820                 ialloc += pag->pagi_count;
 821                 bfree += pag->pagf_freeblks;
 822                 bfreelst += pag->pagf_flcount;
 823                 btree += pag->pagf_btreeblks;
 824                 xfs_perag_put(pag);
 825         }
 826
 827         /* Overwrite incore superblock counters with just-read data */
 828         spin_lock(&mp->m_sb_lock);
 829         sbp->sb_ifree = ifree;
 830         sbp->sb_icount = ialloc;
 831         sbp->sb_fdblocks = bfree + bfreelst + btree;
 832         spin_unlock(&mp->m_sb_lock);
 833
 834         xfs_reinit_percpu_counters(mp);
 835
 836         return 0;
 837 }
 838
 839 /*
 840  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
 841  * into the superblock buffer to be logged.  It does not provide the higher
 842  * level of locking that is needed to protect the in-core superblock from
 843  * concurrent access.
 844  */
 845 void
 846 xfs_log_sb(
 847         struct xfs_trans        *tp)
 848 {
 849         struct xfs_mount        *mp = tp->t_mountp;
 850         struct xfs_buf          *bp = xfs_trans_getsb(tp, mp, 0);
 851
 852         mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
 853         mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
 854         mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
 855
 856         xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 857         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 858         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
 859 }
 860
 861 /*
 862  * xfs_sync_sb
 863  *
 864  * Sync the superblock to disk.
 865  *
 866  * Note that the caller is responsible for checking the frozen state of the
 867  * filesystem. This procedure uses the non-blocking transaction allocator and
 868  * thus will allow modifications to a frozen fs. This is required because this
 869  * code can be called during the process of freezing where use of the high-level
 870  * allocator would deadlock.
 871  */
 872 int
 873 xfs_sync_sb(
 874         struct xfs_mount        *mp,
 875         bool                    wait)
 876 {
 877         struct xfs_trans        *tp;
 878         int                     error;
 879
 880         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
 881                         XFS_TRANS_NO_WRITECOUNT, &tp);
 882         if (error)
 883                 return error;
 884
 885         xfs_log_sb(tp);
 886         if (wait)
 887                 xfs_trans_set_sync(tp);
 888         return xfs_trans_commit(tp);
 889 }
 890
 891 int
 892 xfs_fs_geometry(
 893         struct xfs_sb           *sbp,
 894         struct xfs_fsop_geom    *geo,
 895         int                     struct_version)
 896 {
 897         memset(geo, 0, sizeof(struct xfs_fsop_geom));
 898
 899         geo->blocksize = sbp->sb_blocksize;
 900         geo->rtextsize = sbp->sb_rextsize;
 901         geo->agblocks = sbp->sb_agblocks;
 902         geo->agcount = sbp->sb_agcount;
 903         geo->logblocks = sbp->sb_logblocks;
 904         geo->sectsize = sbp->sb_sectsize;
 905         geo->inodesize = sbp->sb_inodesize;
 906         geo->imaxpct = sbp->sb_imax_pct;
 907         geo->datablocks = sbp->sb_dblocks;
 908         geo->rtblocks = sbp->sb_rblocks;
 909         geo->rtextents = sbp->sb_rextents;
 910         geo->logstart = sbp->sb_logstart;
 911         BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
 912         memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
 913
 914         if (struct_version < 2)
 915                 return 0;
 916
 917         geo->sunit = sbp->sb_unit;
 918         geo->swidth = sbp->sb_width;
 919
 920         if (struct_version < 3)
 921                 return 0;
 922
 923         geo->version = XFS_FSOP_GEOM_VERSION;
 924         geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
 925                      XFS_FSOP_GEOM_FLAGS_DIRV2;
 926         if (xfs_sb_version_hasattr(sbp))
 927                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
 928         if (xfs_sb_version_hasquota(sbp))
 929                 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
 930         if (xfs_sb_version_hasalign(sbp))
 931                 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
 932         if (xfs_sb_version_hasdalign(sbp))
 933                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
 934         if (xfs_sb_version_hasextflgbit(sbp))
 935                 geo->flags |= XFS_FSOP_GEOM_FLAGS_EXTFLG;
 936         if (xfs_sb_version_hassector(sbp))
 937                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
 938         if (xfs_sb_version_hasasciici(sbp))
 939                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
 940         if (xfs_sb_version_haslazysbcount(sbp))
 941                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
 942         if (xfs_sb_version_hasattr2(sbp))
 943                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
 944         if (xfs_sb_version_hasprojid32bit(sbp))
 945                 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
 946         if (xfs_sb_version_hascrc(sbp))
 947                 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
 948         if (xfs_sb_version_hasftype(sbp))
 949                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
 950         if (xfs_sb_version_hasfinobt(sbp))
 951                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
 952         if (xfs_sb_version_hassparseinodes(sbp))
 953                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
 954         if (xfs_sb_version_hasrmapbt(sbp))
 955                 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
 956         if (xfs_sb_version_hasreflink(sbp))
 957                 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
 958         if (xfs_sb_version_hassector(sbp))
 959                 geo->logsectsize = sbp->sb_logsectsize;
 960         else
 961                 geo->logsectsize = BBSIZE;
 962         geo->rtsectsize = sbp->sb_blocksize;
 963         geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
 964
 965         if (struct_version < 4)
 966                 return 0;
 967
 968         if (xfs_sb_version_haslogv2(sbp))
 969                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
 970
 971         geo->logsunit = sbp->sb_logsunit;
 972
 973         return 0;
 974 }