| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_bit.h" |
| #include "xfs_sb.h" |
| #include "xfs_mount.h" |
| #include "xfs_inode.h" |
| #include "xfs_ialloc.h" |
| #include "xfs_alloc.h" |
| #include "xfs_error.h" |
| #include "xfs_trace.h" |
| #include "xfs_cksum.h" |
| #include "xfs_trans.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_log.h" |
| |
| /* |
| * Physical superblock buffer manipulations. Shared with libxfs in userspace. |
| */ |
| |
| /* |
| * Reference counting access wrappers to the perag structures. |
| * Because we never free per-ag structures, the only thing we |
| * have to protect against changes is the tree structure itself. |
| */ |
| struct xfs_perag * |
| xfs_perag_get( |
| struct xfs_mount *mp, |
| xfs_agnumber_t agno) |
| { |
| struct xfs_perag *pag; |
| int ref = 0; |
| |
| rcu_read_lock(); |
| pag = radix_tree_lookup(&mp->m_perag_tree, agno); |
| if (pag) { |
| ASSERT(atomic_read(&pag->pag_ref) >= 0); |
| ref = atomic_inc_return(&pag->pag_ref); |
| } |
| rcu_read_unlock(); |
| trace_xfs_perag_get(mp, agno, ref, _RET_IP_); |
| return pag; |
| } |
| |
| /* |
| * search from @first to find the next perag with the given tag set. |
| */ |
| struct xfs_perag * |
| xfs_perag_get_tag( |
| struct xfs_mount *mp, |
| xfs_agnumber_t first, |
| int tag) |
| { |
| struct xfs_perag *pag; |
| int found; |
| int ref; |
| |
| rcu_read_lock(); |
| found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, |
| (void **)&pag, first, 1, tag); |
| if (found <= 0) { |
| rcu_read_unlock(); |
| return NULL; |
| } |
| ref = atomic_inc_return(&pag->pag_ref); |
| rcu_read_unlock(); |
| trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); |
| return pag; |
| } |
| |
| void |
| xfs_perag_put( |
| struct xfs_perag *pag) |
| { |
| int ref; |
| |
| ASSERT(atomic_read(&pag->pag_ref) > 0); |
| ref = atomic_dec_return(&pag->pag_ref); |
| trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); |
| } |
| |
| /* |
| * Check the validity of the SB found. |
| */ |
| STATIC int |
| xfs_mount_validate_sb( |
| xfs_mount_t *mp, |
| xfs_sb_t *sbp, |
| bool check_inprogress, |
| bool check_version) |
| { |
| if (sbp->sb_magicnum != XFS_SB_MAGIC) { |
| xfs_warn(mp, "bad magic number"); |
| return -EWRONGFS; |
| } |
| |
| |
| if (!xfs_sb_good_version(sbp)) { |
| xfs_warn(mp, "bad version"); |
| return -EWRONGFS; |
| } |
| |
| /* |
| * Version 5 superblock feature mask validation. Reject combinations the |
| * kernel cannot support up front before checking anything else. For |
| * write validation, we don't need to check feature masks. |
| */ |
| if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { |
| if (xfs_sb_has_compat_feature(sbp, |
| XFS_SB_FEAT_COMPAT_UNKNOWN)) { |
| xfs_warn(mp, |
| "Superblock has unknown compatible features (0x%x) enabled.", |
| (sbp->sb_features_compat & |
| XFS_SB_FEAT_COMPAT_UNKNOWN)); |
| xfs_warn(mp, |
| "Using a more recent kernel is recommended."); |
| } |
| |
| if (xfs_sb_has_ro_compat_feature(sbp, |
| XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { |
| xfs_alert(mp, |
| "Superblock has unknown read-only compatible features (0x%x) enabled.", |
| (sbp->sb_features_ro_compat & |
| XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); |
| if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
| xfs_warn(mp, |
| "Attempted to mount read-only compatible filesystem read-write."); |
| xfs_warn(mp, |
| "Filesystem can only be safely mounted read only."); |
| |
| return -EINVAL; |
| } |
| } |
| if (xfs_sb_has_incompat_feature(sbp, |
| XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { |
| xfs_warn(mp, |
| "Superblock has unknown incompatible features (0x%x) enabled.", |
| (sbp->sb_features_incompat & |
| XFS_SB_FEAT_INCOMPAT_UNKNOWN)); |
| xfs_warn(mp, |
| "Filesystem can not be safely mounted by this kernel."); |
| return -EINVAL; |
| } |
| } else if (xfs_sb_version_hascrc(sbp)) { |
| /* |
| * We can't read verify the sb LSN because the read verifier is |
| * called before the log is allocated and processed. We know the |
| * log is set up before write verifier (!check_version) calls, |
| * so just check it here. |
| */ |
| if (!xfs_log_check_lsn(mp, sbp->sb_lsn)) |
| return -EFSCORRUPTED; |
| } |
| |
| if (xfs_sb_version_has_pquotino(sbp)) { |
| if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { |
| xfs_notice(mp, |
| "Version 5 of Super block has XFS_OQUOTA bits."); |
| return -EFSCORRUPTED; |
| } |
| } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | |
| XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { |
| xfs_notice(mp, |
| "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits."); |
| return -EFSCORRUPTED; |
| } |
| |
| /* |
| * Full inode chunks must be aligned to inode chunk size when |
| * sparse inodes are enabled to support the sparse chunk |
| * allocation algorithm and prevent overlapping inode records. |
| */ |
| if (xfs_sb_version_hassparseinodes(sbp)) { |
| uint32_t align; |
| |
| align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize |
| >> sbp->sb_blocklog; |
| if (sbp->sb_inoalignmt != align) { |
| xfs_warn(mp, |
| "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.", |
| sbp->sb_inoalignmt, align); |
| return -EINVAL; |
| } |
| } |
| |
| if (unlikely( |
| sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { |
| xfs_warn(mp, |
| "filesystem is marked as having an external log; " |
| "specify logdev on the mount command line."); |
| return -EINVAL; |
| } |
| |
| if (unlikely( |
| sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { |
| xfs_warn(mp, |
| "filesystem is marked as having an internal log; " |
| "do not specify logdev on the mount command line."); |
| return -EINVAL; |
| } |
| |
| /* |
| * More sanity checking. Most of these were stolen directly from |
| * xfs_repair. |
| */ |
| if (unlikely( |
| sbp->sb_agcount <= 0 || |
| sbp->sb_sectsize < XFS_MIN_SECTORSIZE || |
| sbp->sb_sectsize > XFS_MAX_SECTORSIZE || |
| sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || |
| sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || |
| sbp->sb_sectsize != (1 << sbp->sb_sectlog) || |
| sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || |
| sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || |
| sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || |
| sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || |
| sbp->sb_blocksize != (1 << sbp->sb_blocklog) || |
| sbp->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG || |
| sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
| sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || |
| sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
| sbp->sb_inodelog > XFS_DINODE_MAX_LOG || |
| sbp->sb_inodesize != (1 << sbp->sb_inodelog) || |
| sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE || |
| sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || |
| (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
| (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
| (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || |
| (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || |
| sbp->sb_dblocks == 0 || |
| sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || |
| sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) || |
| sbp->sb_shared_vn != 0)) { |
| xfs_notice(mp, "SB sanity check failed"); |
| return -EFSCORRUPTED; |
| } |
| |
| /* |
| * Until this is fixed only page-sized or smaller data blocks work. |
| */ |
| if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { |
| xfs_warn(mp, |
| "File system with blocksize %d bytes. " |
| "Only pagesize (%ld) or less will currently work.", |
| sbp->sb_blocksize, PAGE_SIZE); |
| return -ENOSYS; |
| } |
| |
| /* |
| * Currently only very few inode sizes are supported. |
| */ |
| switch (sbp->sb_inodesize) { |
| case 256: |
| case 512: |
| case 1024: |
| case 2048: |
| break; |
| default: |
| xfs_warn(mp, "inode size of %d bytes not supported", |
| sbp->sb_inodesize); |
| return -ENOSYS; |
| } |
| |
| if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
| xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { |
| xfs_warn(mp, |
| "file system too large to be mounted on this system."); |
| return -EFBIG; |
| } |
| |
| if (check_inprogress && sbp->sb_inprogress) { |
| xfs_warn(mp, "Offline file system operation in progress!"); |
| return -EFSCORRUPTED; |
| } |
| return 0; |
| } |
| |
| void |
| xfs_sb_quota_from_disk(struct xfs_sb *sbp) |
| { |
| /* |
| * older mkfs doesn't initialize quota inodes to NULLFSINO. This |
| * leads to in-core values having two different values for a quota |
| * inode to be invalid: 0 and NULLFSINO. Change it to a single value |
| * NULLFSINO. |
| * |
| * Note that this change affect only the in-core values. These |
| * values are not written back to disk unless any quota information |
| * is written to the disk. Even in that case, sb_pquotino field is |
| * not written to disk unless the superblock supports pquotino. |
| */ |
| if (sbp->sb_uquotino == 0) |
| sbp->sb_uquotino = NULLFSINO; |
| if (sbp->sb_gquotino == 0) |
| sbp->sb_gquotino = NULLFSINO; |
| if (sbp->sb_pquotino == 0) |
| sbp->sb_pquotino = NULLFSINO; |
| |
| /* |
| * We need to do these manipilations only if we are working |
| * with an older version of on-disk superblock. |
| */ |
| if (xfs_sb_version_has_pquotino(sbp)) |
| return; |
| |
| if (sbp->sb_qflags & XFS_OQUOTA_ENFD) |
| sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? |
| XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; |
| if (sbp->sb_qflags & XFS_OQUOTA_CHKD) |
| sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? |
| XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; |
| sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); |
| |
| if (sbp->sb_qflags & XFS_PQUOTA_ACCT) { |
| /* |
| * In older version of superblock, on-disk superblock only |
| * has sb_gquotino, and in-core superblock has both sb_gquotino |
| * and sb_pquotino. But, only one of them is supported at any |
| * point of time. So, if PQUOTA is set in disk superblock, |
| * copy over sb_gquotino to sb_pquotino. |
| */ |
| sbp->sb_pquotino = sbp->sb_gquotino; |
| sbp->sb_gquotino = NULLFSINO; |
| } |
| } |
| |
| static void |
| __xfs_sb_from_disk( |
| struct xfs_sb *to, |
| xfs_dsb_t *from, |
| bool convert_xquota) |
| { |
| to->sb_magicnum = be32_to_cpu(from->sb_magicnum); |
| to->sb_blocksize = be32_to_cpu(from->sb_blocksize); |
| to->sb_dblocks = be64_to_cpu(from->sb_dblocks); |
| to->sb_rblocks = be64_to_cpu(from->sb_rblocks); |
| to->sb_rextents = be64_to_cpu(from->sb_rextents); |
| memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); |
| to->sb_logstart = be64_to_cpu(from->sb_logstart); |
| to->sb_rootino = be64_to_cpu(from->sb_rootino); |
| to->sb_rbmino = be64_to_cpu(from->sb_rbmino); |
| to->sb_rsumino = be64_to_cpu(from->sb_rsumino); |
| to->sb_rextsize = be32_to_cpu(from->sb_rextsize); |
| to->sb_agblocks = be32_to_cpu(from->sb_agblocks); |
| to->sb_agcount = be32_to_cpu(from->sb_agcount); |
| to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); |
| to->sb_logblocks = be32_to_cpu(from->sb_logblocks); |
| to->sb_versionnum = be16_to_cpu(from->sb_versionnum); |
| to->sb_sectsize = be16_to_cpu(from->sb_sectsize); |
| to->sb_inodesize = be16_to_cpu(from->sb_inodesize); |
| to->sb_inopblock = be16_to_cpu(from->sb_inopblock); |
| memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); |
| to->sb_blocklog = from->sb_blocklog; |
| to->sb_sectlog = from->sb_sectlog; |
| to->sb_inodelog = from->sb_inodelog; |
| to->sb_inopblog = from->sb_inopblog; |
| to->sb_agblklog = from->sb_agblklog; |
| to->sb_rextslog = from->sb_rextslog; |
| to->sb_inprogress = from->sb_inprogress; |
| to->sb_imax_pct = from->sb_imax_pct; |
| to->sb_icount = be64_to_cpu(from->sb_icount); |
| to->sb_ifree = be64_to_cpu(from->sb_ifree); |
| to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); |
| to->sb_frextents = be64_to_cpu(from->sb_frextents); |
| to->sb_uquotino = be64_to_cpu(from->sb_uquotino); |
| to->sb_gquotino = be64_to_cpu(from->sb_gquotino); |
| to->sb_qflags = be16_to_cpu(from->sb_qflags); |
| to->sb_flags = from->sb_flags; |
| to->sb_shared_vn = from->sb_shared_vn; |
| to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); |
| to->sb_unit = be32_to_cpu(from->sb_unit); |
| to->sb_width = be32_to_cpu(from->sb_width); |
| to->sb_dirblklog = from->sb_dirblklog; |
| to->sb_logsectlog = from->sb_logsectlog; |
| to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); |
| to->sb_logsunit = be32_to_cpu(from->sb_logsunit); |
| to->sb_features2 = be32_to_cpu(from->sb_features2); |
| to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); |
| to->sb_features_compat = be32_to_cpu(from->sb_features_compat); |
| to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); |
| to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); |
| to->sb_features_log_incompat = |
| be32_to_cpu(from->sb_features_log_incompat); |
| /* crc is only used on disk, not in memory; just init to 0 here. */ |
| to->sb_crc = 0; |
| to->sb_spino_align = be32_to_cpu(from->sb_spino_align); |
| to->sb_pquotino = be64_to_cpu(from->sb_pquotino); |
| to->sb_lsn = be64_to_cpu(from->sb_lsn); |
| /* |
| * sb_meta_uuid is only on disk if it differs from sb_uuid and the |
| * feature flag is set; if not set we keep it only in memory. |
| */ |
| if (xfs_sb_version_hasmetauuid(to)) |
| uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); |
| else |
| uuid_copy(&to->sb_meta_uuid, &from->sb_uuid); |
| /* Convert on-disk flags to in-memory flags? */ |
| if (convert_xquota) |
| xfs_sb_quota_from_disk(to); |
| } |
| |
| void |
| xfs_sb_from_disk( |
| struct xfs_sb *to, |
| xfs_dsb_t *from) |
| { |
| __xfs_sb_from_disk(to, from, true); |
| } |
| |
| static void |
| xfs_sb_quota_to_disk( |
| struct xfs_dsb *to, |
| struct xfs_sb *from) |
| { |
| __uint16_t qflags = from->sb_qflags; |
| |
| to->sb_uquotino = cpu_to_be64(from->sb_uquotino); |
| if (xfs_sb_version_has_pquotino(from)) { |
| to->sb_qflags = cpu_to_be16(from->sb_qflags); |
| to->sb_gquotino = cpu_to_be64(from->sb_gquotino); |
| to->sb_pquotino = cpu_to_be64(from->sb_pquotino); |
| return; |
| } |
| |
| /* |
| * The in-core version of sb_qflags do not have XFS_OQUOTA_* |
| * flags, whereas the on-disk version does. So, convert incore |
| * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags. |
| */ |
| qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | |
| XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); |
| |
| if (from->sb_qflags & |
| (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) |
| qflags |= XFS_OQUOTA_ENFD; |
| if (from->sb_qflags & |
| (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) |
| qflags |= XFS_OQUOTA_CHKD; |
| to->sb_qflags = cpu_to_be16(qflags); |
| |
| /* |
| * GQUOTINO and PQUOTINO cannot be used together in versions |
| * of superblock that do not have pquotino. from->sb_flags |
| * tells us which quota is active and should be copied to |
| * disk. If neither are active, we should NULL the inode. |
| * |
| * In all cases, the separate pquotino must remain 0 because it |
| * it beyond the "end" of the valid non-pquotino superblock. |
| */ |
| if (from->sb_qflags & XFS_GQUOTA_ACCT) |
| to->sb_gquotino = cpu_to_be64(from->sb_gquotino); |
| else if (from->sb_qflags & XFS_PQUOTA_ACCT) |
| to->sb_gquotino = cpu_to_be64(from->sb_pquotino); |
| else { |
| /* |
| * We can't rely on just the fields being logged to tell us |
| * that it is safe to write NULLFSINO - we should only do that |
| * if quotas are not actually enabled. Hence only write |
| * NULLFSINO if both in-core quota inodes are NULL. |
| */ |
| if (from->sb_gquotino == NULLFSINO && |
| from->sb_pquotino == NULLFSINO) |
| to->sb_gquotino = cpu_to_be64(NULLFSINO); |
| } |
| |
| to->sb_pquotino = 0; |
| } |
| |
| void |
| xfs_sb_to_disk( |
| struct xfs_dsb *to, |
| struct xfs_sb *from) |
| { |
| xfs_sb_quota_to_disk(to, from); |
| |
| to->sb_magicnum = cpu_to_be32(from->sb_magicnum); |
| to->sb_blocksize = cpu_to_be32(from->sb_blocksize); |
| to->sb_dblocks = cpu_to_be64(from->sb_dblocks); |
| to->sb_rblocks = cpu_to_be64(from->sb_rblocks); |
| to->sb_rextents = cpu_to_be64(from->sb_rextents); |
| memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); |
| to->sb_logstart = cpu_to_be64(from->sb_logstart); |
| to->sb_rootino = cpu_to_be64(from->sb_rootino); |
| to->sb_rbmino = cpu_to_be64(from->sb_rbmino); |
| to->sb_rsumino = cpu_to_be64(from->sb_rsumino); |
| to->sb_rextsize = cpu_to_be32(from->sb_rextsize); |
| to->sb_agblocks = cpu_to_be32(from->sb_agblocks); |
| to->sb_agcount = cpu_to_be32(from->sb_agcount); |
| to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks); |
| to->sb_logblocks = cpu_to_be32(from->sb_logblocks); |
| to->sb_versionnum = cpu_to_be16(from->sb_versionnum); |
| to->sb_sectsize = cpu_to_be16(from->sb_sectsize); |
| to->sb_inodesize = cpu_to_be16(from->sb_inodesize); |
| to->sb_inopblock = cpu_to_be16(from->sb_inopblock); |
| memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); |
| to->sb_blocklog = from->sb_blocklog; |
| to->sb_sectlog = from->sb_sectlog; |
| to->sb_inodelog = from->sb_inodelog; |
| to->sb_inopblog = from->sb_inopblog; |
| to->sb_agblklog = from->sb_agblklog; |
| to->sb_rextslog = from->sb_rextslog; |
| to->sb_inprogress = from->sb_inprogress; |
| to->sb_imax_pct = from->sb_imax_pct; |
| to->sb_icount = cpu_to_be64(from->sb_icount); |
| to->sb_ifree = cpu_to_be64(from->sb_ifree); |
| to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks); |
| to->sb_frextents = cpu_to_be64(from->sb_frextents); |
| |
| to->sb_flags = from->sb_flags; |
| to->sb_shared_vn = from->sb_shared_vn; |
| to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt); |
| to->sb_unit = cpu_to_be32(from->sb_unit); |
| to->sb_width = cpu_to_be32(from->sb_width); |
| to->sb_dirblklog = from->sb_dirblklog; |
| to->sb_logsectlog = from->sb_logsectlog; |
| to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize); |
| to->sb_logsunit = cpu_to_be32(from->sb_logsunit); |
| |
| /* |
| * We need to ensure that bad_features2 always matches features2. |
| * Hence we enforce that here rather than having to remember to do it |
| * everywhere else that updates features2. |
| */ |
| from->sb_bad_features2 = from->sb_features2; |
| to->sb_features2 = cpu_to_be32(from->sb_features2); |
| to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2); |
| |
| if (xfs_sb_version_hascrc(from)) { |
| to->sb_features_compat = cpu_to_be32(from->sb_features_compat); |
| to->sb_features_ro_compat = |
| cpu_to_be32(from->sb_features_ro_compat); |
| to->sb_features_incompat = |
| cpu_to_be32(from->sb_features_incompat); |
| to->sb_features_log_incompat = |
| cpu_to_be32(from->sb_features_log_incompat); |
| to->sb_spino_align = cpu_to_be32(from->sb_spino_align); |
| to->sb_lsn = cpu_to_be64(from->sb_lsn); |
| if (xfs_sb_version_hasmetauuid(from)) |
| uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid); |
| } |
| } |
| |
| static int |
| xfs_sb_verify( |
| struct xfs_buf *bp, |
| bool check_version) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_sb sb; |
| |
| /* |
| * Use call variant which doesn't convert quota flags from disk |
| * format, because xfs_mount_validate_sb checks the on-disk flags. |
| */ |
| __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false); |
| |
| /* |
| * Only check the in progress field for the primary superblock as |
| * mkfs.xfs doesn't clear it from secondary superblocks. |
| */ |
| return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR, |
| check_version); |
| } |
| |
| /* |
| * If the superblock has the CRC feature bit set or the CRC field is non-null, |
| * check that the CRC is valid. We check the CRC field is non-null because a |
| * single bit error could clear the feature bit and unused parts of the |
| * superblock are supposed to be zero. Hence a non-null crc field indicates that |
| * we've potentially lost a feature bit and we should check it anyway. |
| * |
| * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the |
| * last field in V4 secondary superblocks. So for secondary superblocks, |
| * we are more forgiving, and ignore CRC failures if the primary doesn't |
| * indicate that the fs version is V5. |
| */ |
| static void |
| xfs_sb_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); |
| int error; |
| |
| /* |
| * open code the version check to avoid needing to convert the entire |
| * superblock from disk order just to check the version number |
| */ |
| if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && |
| (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == |
| XFS_SB_VERSION_5) || |
| dsb->sb_crc != 0)) { |
| |
| if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { |
| /* Only fail bad secondaries on a known V5 filesystem */ |
| if (bp->b_bn == XFS_SB_DADDR || |
| xfs_sb_version_hascrc(&mp->m_sb)) { |
| error = -EFSBADCRC; |
| goto out_error; |
| } |
| } |
| } |
| error = xfs_sb_verify(bp, true); |
| |
| out_error: |
| if (error) { |
| xfs_buf_ioerror(bp, error); |
| if (error == -EFSCORRUPTED || error == -EFSBADCRC) |
| xfs_verifier_error(bp); |
| } |
| } |
| |
| /* |
| * We may be probed for a filesystem match, so we may not want to emit |
| * messages when the superblock buffer is not actually an XFS superblock. |
| * If we find an XFS superblock, then run a normal, noisy mount because we are |
| * really going to mount it and want to know about errors. |
| */ |
| static void |
| xfs_sb_quiet_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); |
| |
| if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { |
| /* XFS filesystem, verify noisily! */ |
| xfs_sb_read_verify(bp); |
| return; |
| } |
| /* quietly fail */ |
| xfs_buf_ioerror(bp, -EWRONGFS); |
| } |
| |
| static void |
| xfs_sb_write_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_buf_log_item *bip = bp->b_fspriv; |
| int error; |
| |
| error = xfs_sb_verify(bp, false); |
| if (error) { |
| xfs_buf_ioerror(bp, error); |
| xfs_verifier_error(bp); |
| return; |
| } |
| |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return; |
| |
| if (bip) |
| XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| |
| xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); |
| } |
| |
| const struct xfs_buf_ops xfs_sb_buf_ops = { |
| .name = "xfs_sb", |
| .verify_read = xfs_sb_read_verify, |
| .verify_write = xfs_sb_write_verify, |
| }; |
| |
| const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { |
| .name = "xfs_sb_quiet", |
| .verify_read = xfs_sb_quiet_read_verify, |
| .verify_write = xfs_sb_write_verify, |
| }; |
| |
| /* |
| * xfs_mount_common |
| * |
| * Mount initialization code establishing various mount |
| * fields from the superblock associated with the given |
| * mount structure |
| */ |
| void |
| xfs_sb_mount_common( |
| struct xfs_mount *mp, |
| struct xfs_sb *sbp) |
| { |
| mp->m_agfrotor = mp->m_agirotor = 0; |
| spin_lock_init(&mp->m_agirotor_lock); |
| mp->m_maxagi = mp->m_sb.sb_agcount; |
| mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; |
| mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; |
| mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; |
| mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; |
| mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; |
| mp->m_blockmask = sbp->sb_blocksize - 1; |
| mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; |
| mp->m_blockwmask = mp->m_blockwsize - 1; |
| |
| mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); |
| mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); |
| mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; |
| mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; |
| |
| mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); |
| mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); |
| mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; |
| mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; |
| |
| mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); |
| mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); |
| mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; |
| mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; |
| |
| mp->m_bsize = XFS_FSB_TO_BB(mp, 1); |
| mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, |
| sbp->sb_inopblock); |
| mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; |
| |
| if (sbp->sb_spino_align) |
| mp->m_ialloc_min_blks = sbp->sb_spino_align; |
| else |
| mp->m_ialloc_min_blks = mp->m_ialloc_blks; |
| } |
| |
| /* |
| * xfs_initialize_perag_data |
| * |
| * Read in each per-ag structure so we can count up the number of |
| * allocated inodes, free inodes and used filesystem blocks as this |
| * information is no longer persistent in the superblock. Once we have |
| * this information, write it into the in-core superblock structure. |
| */ |
| int |
| xfs_initialize_perag_data( |
| struct xfs_mount *mp, |
| xfs_agnumber_t agcount) |
| { |
| xfs_agnumber_t index; |
| xfs_perag_t *pag; |
| xfs_sb_t *sbp = &mp->m_sb; |
| uint64_t ifree = 0; |
| uint64_t ialloc = 0; |
| uint64_t bfree = 0; |
| uint64_t bfreelst = 0; |
| uint64_t btree = 0; |
| int error; |
| |
| for (index = 0; index < agcount; index++) { |
| /* |
| * read the agf, then the agi. This gets us |
| * all the information we need and populates the |
| * per-ag structures for us. |
| */ |
| error = xfs_alloc_pagf_init(mp, NULL, index, 0); |
| if (error) |
| return error; |
| |
| error = xfs_ialloc_pagi_init(mp, NULL, index); |
| if (error) |
| return error; |
| pag = xfs_perag_get(mp, index); |
| ifree += pag->pagi_freecount; |
| ialloc += pag->pagi_count; |
| bfree += pag->pagf_freeblks; |
| bfreelst += pag->pagf_flcount; |
| btree += pag->pagf_btreeblks; |
| xfs_perag_put(pag); |
| } |
| |
| /* Overwrite incore superblock counters with just-read data */ |
| spin_lock(&mp->m_sb_lock); |
| sbp->sb_ifree = ifree; |
| sbp->sb_icount = ialloc; |
| sbp->sb_fdblocks = bfree + bfreelst + btree; |
| spin_unlock(&mp->m_sb_lock); |
| |
| xfs_reinit_percpu_counters(mp); |
| |
| return 0; |
| } |
| |
| /* |
| * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock |
| * into the superblock buffer to be logged. It does not provide the higher |
| * level of locking that is needed to protect the in-core superblock from |
| * concurrent access. |
| */ |
| void |
| xfs_log_sb( |
| struct xfs_trans *tp) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_buf *bp = xfs_trans_getsb(tp, mp, 0); |
| |
| mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount); |
| mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree); |
| mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks); |
| |
| xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); |
| xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); |
| xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb)); |
| } |
| |
| /* |
| * xfs_sync_sb |
| * |
| * Sync the superblock to disk. |
| * |
| * Note that the caller is responsible for checking the frozen state of the |
| * filesystem. This procedure uses the non-blocking transaction allocator and |
| * thus will allow modifications to a frozen fs. This is required because this |
| * code can be called during the process of freezing where use of the high-level |
| * allocator would deadlock. |
| */ |
| int |
| xfs_sync_sb( |
| struct xfs_mount *mp, |
| bool wait) |
| { |
| struct xfs_trans *tp; |
| int error; |
| |
| tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_CHANGE, KM_SLEEP); |
| error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); |
| if (error) { |
| xfs_trans_cancel(tp); |
| return error; |
| } |
| |
| xfs_log_sb(tp); |
| if (wait) |
| xfs_trans_set_sync(tp); |
| return xfs_trans_commit(tp); |
| } |