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![Eric Sandeen](/assets/img/avatar_default.png)
Today, if xfs_sb_read_verify encounters a v4 superblock with junk past v4 fields which includes data in sb_crc, it will be treated as a failing checksum and a significant corruption. There are known prior bugs which leave junk at the end of the V4 superblock; we don't need to actually fail the verification in this case if other checks pan out ok. So if this is a secondary superblock, and the primary superblock doesn't indicate that this is a V5 filesystem, don't treat this as an actual checksum failure. We should probably check the garbage condition as we do in xfs_repair, and possibly warn about it or self-heal, but that's a different scope of work. Stable folks: This can go back to v3.10, which is what introduced the sb CRC checking that is tripped up by old, stale, incorrect V4 superblocks w/ unzeroed bits. Cc: stable@vger.kernel.org Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
836 lines
24 KiB
C
836 lines
24 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_cksum.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_dinode.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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/*
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* Physical superblock buffer manipulations. Shared with libxfs in userspace.
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*/
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static const struct {
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short offset;
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short type; /* 0 = integer
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* 1 = binary / string (no translation)
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*/
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} xfs_sb_info[] = {
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{ offsetof(xfs_sb_t, sb_magicnum), 0 },
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{ offsetof(xfs_sb_t, sb_blocksize), 0 },
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{ offsetof(xfs_sb_t, sb_dblocks), 0 },
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{ offsetof(xfs_sb_t, sb_rblocks), 0 },
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{ offsetof(xfs_sb_t, sb_rextents), 0 },
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{ offsetof(xfs_sb_t, sb_uuid), 1 },
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{ offsetof(xfs_sb_t, sb_logstart), 0 },
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{ offsetof(xfs_sb_t, sb_rootino), 0 },
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{ offsetof(xfs_sb_t, sb_rbmino), 0 },
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{ offsetof(xfs_sb_t, sb_rsumino), 0 },
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{ offsetof(xfs_sb_t, sb_rextsize), 0 },
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{ offsetof(xfs_sb_t, sb_agblocks), 0 },
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{ offsetof(xfs_sb_t, sb_agcount), 0 },
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{ offsetof(xfs_sb_t, sb_rbmblocks), 0 },
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{ offsetof(xfs_sb_t, sb_logblocks), 0 },
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{ offsetof(xfs_sb_t, sb_versionnum), 0 },
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{ offsetof(xfs_sb_t, sb_sectsize), 0 },
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{ offsetof(xfs_sb_t, sb_inodesize), 0 },
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{ offsetof(xfs_sb_t, sb_inopblock), 0 },
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{ offsetof(xfs_sb_t, sb_fname[0]), 1 },
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{ offsetof(xfs_sb_t, sb_blocklog), 0 },
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{ offsetof(xfs_sb_t, sb_sectlog), 0 },
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{ offsetof(xfs_sb_t, sb_inodelog), 0 },
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{ offsetof(xfs_sb_t, sb_inopblog), 0 },
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{ offsetof(xfs_sb_t, sb_agblklog), 0 },
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{ offsetof(xfs_sb_t, sb_rextslog), 0 },
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{ offsetof(xfs_sb_t, sb_inprogress), 0 },
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{ offsetof(xfs_sb_t, sb_imax_pct), 0 },
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{ offsetof(xfs_sb_t, sb_icount), 0 },
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{ offsetof(xfs_sb_t, sb_ifree), 0 },
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{ offsetof(xfs_sb_t, sb_fdblocks), 0 },
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{ offsetof(xfs_sb_t, sb_frextents), 0 },
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{ offsetof(xfs_sb_t, sb_uquotino), 0 },
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{ offsetof(xfs_sb_t, sb_gquotino), 0 },
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{ offsetof(xfs_sb_t, sb_qflags), 0 },
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{ offsetof(xfs_sb_t, sb_flags), 0 },
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{ offsetof(xfs_sb_t, sb_shared_vn), 0 },
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{ offsetof(xfs_sb_t, sb_inoalignmt), 0 },
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{ offsetof(xfs_sb_t, sb_unit), 0 },
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{ offsetof(xfs_sb_t, sb_width), 0 },
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{ offsetof(xfs_sb_t, sb_dirblklog), 0 },
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{ offsetof(xfs_sb_t, sb_logsectlog), 0 },
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{ offsetof(xfs_sb_t, sb_logsectsize), 0 },
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{ offsetof(xfs_sb_t, sb_logsunit), 0 },
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{ offsetof(xfs_sb_t, sb_features2), 0 },
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{ offsetof(xfs_sb_t, sb_bad_features2), 0 },
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{ offsetof(xfs_sb_t, sb_features_compat), 0 },
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{ offsetof(xfs_sb_t, sb_features_ro_compat), 0 },
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{ offsetof(xfs_sb_t, sb_features_incompat), 0 },
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{ offsetof(xfs_sb_t, sb_features_log_incompat), 0 },
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{ offsetof(xfs_sb_t, sb_crc), 0 },
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{ offsetof(xfs_sb_t, sb_pad), 0 },
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{ offsetof(xfs_sb_t, sb_pquotino), 0 },
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{ offsetof(xfs_sb_t, sb_lsn), 0 },
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{ sizeof(xfs_sb_t), 0 }
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};
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/*
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* Reference counting access wrappers to the perag structures.
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* Because we never free per-ag structures, the only thing we
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* have to protect against changes is the tree structure itself.
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*/
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struct xfs_perag *
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xfs_perag_get(
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struct xfs_mount *mp,
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xfs_agnumber_t agno)
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{
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struct xfs_perag *pag;
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int ref = 0;
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rcu_read_lock();
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pag = radix_tree_lookup(&mp->m_perag_tree, agno);
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if (pag) {
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ASSERT(atomic_read(&pag->pag_ref) >= 0);
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ref = atomic_inc_return(&pag->pag_ref);
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}
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rcu_read_unlock();
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trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
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return pag;
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}
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/*
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* search from @first to find the next perag with the given tag set.
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*/
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struct xfs_perag *
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xfs_perag_get_tag(
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struct xfs_mount *mp,
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xfs_agnumber_t first,
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int tag)
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{
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struct xfs_perag *pag;
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int found;
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int ref;
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rcu_read_lock();
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found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
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(void **)&pag, first, 1, tag);
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if (found <= 0) {
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rcu_read_unlock();
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return NULL;
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}
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ref = atomic_inc_return(&pag->pag_ref);
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rcu_read_unlock();
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trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
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return pag;
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}
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void
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xfs_perag_put(
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struct xfs_perag *pag)
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{
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int ref;
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ASSERT(atomic_read(&pag->pag_ref) > 0);
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ref = atomic_dec_return(&pag->pag_ref);
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trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
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}
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/*
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* Check the validity of the SB found.
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*/
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STATIC int
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xfs_mount_validate_sb(
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xfs_mount_t *mp,
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xfs_sb_t *sbp,
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bool check_inprogress,
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bool check_version)
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{
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/*
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* If the log device and data device have the
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* same device number, the log is internal.
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* Consequently, the sb_logstart should be non-zero. If
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* we have a zero sb_logstart in this case, we may be trying to mount
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* a volume filesystem in a non-volume manner.
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*/
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if (sbp->sb_magicnum != XFS_SB_MAGIC) {
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xfs_warn(mp, "bad magic number");
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return XFS_ERROR(EWRONGFS);
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}
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if (!xfs_sb_good_version(sbp)) {
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xfs_warn(mp, "bad version");
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return XFS_ERROR(EWRONGFS);
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}
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/*
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* Version 5 superblock feature mask validation. Reject combinations the
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* kernel cannot support up front before checking anything else. For
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* write validation, we don't need to check feature masks.
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*/
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if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
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xfs_alert(mp,
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"Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!\n"
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"Use of these features in this kernel is at your own risk!");
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if (xfs_sb_has_compat_feature(sbp,
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XFS_SB_FEAT_COMPAT_UNKNOWN)) {
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xfs_warn(mp,
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"Superblock has unknown compatible features (0x%x) enabled.\n"
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"Using a more recent kernel is recommended.",
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(sbp->sb_features_compat &
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XFS_SB_FEAT_COMPAT_UNKNOWN));
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}
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if (xfs_sb_has_ro_compat_feature(sbp,
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XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
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xfs_alert(mp,
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"Superblock has unknown read-only compatible features (0x%x) enabled.",
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(sbp->sb_features_ro_compat &
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XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
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if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
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xfs_warn(mp,
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"Attempted to mount read-only compatible filesystem read-write.\n"
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"Filesystem can only be safely mounted read only.");
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return XFS_ERROR(EINVAL);
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}
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}
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if (xfs_sb_has_incompat_feature(sbp,
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XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
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xfs_warn(mp,
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"Superblock has unknown incompatible features (0x%x) enabled.\n"
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"Filesystem can not be safely mounted by this kernel.",
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(sbp->sb_features_incompat &
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XFS_SB_FEAT_INCOMPAT_UNKNOWN));
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return XFS_ERROR(EINVAL);
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}
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}
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if (xfs_sb_version_has_pquotino(sbp)) {
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if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
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xfs_notice(mp,
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"Version 5 of Super block has XFS_OQUOTA bits.");
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return XFS_ERROR(EFSCORRUPTED);
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}
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} else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
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XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
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xfs_notice(mp,
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"Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
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return XFS_ERROR(EFSCORRUPTED);
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}
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if (unlikely(
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sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
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xfs_warn(mp,
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"filesystem is marked as having an external log; "
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"specify logdev on the mount command line.");
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return XFS_ERROR(EINVAL);
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}
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if (unlikely(
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sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
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xfs_warn(mp,
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"filesystem is marked as having an internal log; "
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"do not specify logdev on the mount command line.");
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return XFS_ERROR(EINVAL);
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}
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/*
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* More sanity checking. Most of these were stolen directly from
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* xfs_repair.
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*/
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if (unlikely(
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sbp->sb_agcount <= 0 ||
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sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
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sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
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sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
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sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
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sbp->sb_sectsize != (1 << sbp->sb_sectlog) ||
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sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
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sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
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sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
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sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
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sbp->sb_blocksize != (1 << sbp->sb_blocklog) ||
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sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
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sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
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sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
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sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
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sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
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(sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
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(sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
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(sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
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(sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
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sbp->sb_dblocks == 0 ||
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sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
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sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) {
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XFS_CORRUPTION_ERROR("SB sanity check failed",
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XFS_ERRLEVEL_LOW, mp, sbp);
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return XFS_ERROR(EFSCORRUPTED);
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}
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/*
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* Until this is fixed only page-sized or smaller data blocks work.
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*/
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if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
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xfs_warn(mp,
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"File system with blocksize %d bytes. "
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"Only pagesize (%ld) or less will currently work.",
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sbp->sb_blocksize, PAGE_SIZE);
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return XFS_ERROR(ENOSYS);
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}
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/*
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* Currently only very few inode sizes are supported.
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*/
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switch (sbp->sb_inodesize) {
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case 256:
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case 512:
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case 1024:
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case 2048:
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break;
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default:
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xfs_warn(mp, "inode size of %d bytes not supported",
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sbp->sb_inodesize);
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return XFS_ERROR(ENOSYS);
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}
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if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
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xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
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xfs_warn(mp,
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"file system too large to be mounted on this system.");
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return XFS_ERROR(EFBIG);
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}
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if (check_inprogress && sbp->sb_inprogress) {
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xfs_warn(mp, "Offline file system operation in progress!");
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return XFS_ERROR(EFSCORRUPTED);
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}
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/*
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* Version 1 directory format has never worked on Linux.
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*/
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if (unlikely(!xfs_sb_version_hasdirv2(sbp))) {
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xfs_warn(mp, "file system using version 1 directory format");
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return XFS_ERROR(ENOSYS);
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}
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return 0;
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}
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void
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xfs_sb_quota_from_disk(struct xfs_sb *sbp)
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{
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/*
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* older mkfs doesn't initialize quota inodes to NULLFSINO. This
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* leads to in-core values having two different values for a quota
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* inode to be invalid: 0 and NULLFSINO. Change it to a single value
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* NULLFSINO.
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*
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* Note that this change affect only the in-core values. These
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* values are not written back to disk unless any quota information
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* is written to the disk. Even in that case, sb_pquotino field is
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* not written to disk unless the superblock supports pquotino.
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*/
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if (sbp->sb_uquotino == 0)
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sbp->sb_uquotino = NULLFSINO;
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if (sbp->sb_gquotino == 0)
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sbp->sb_gquotino = NULLFSINO;
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if (sbp->sb_pquotino == 0)
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sbp->sb_pquotino = NULLFSINO;
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/*
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* We need to do these manipilations only if we are working
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* with an older version of on-disk superblock.
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*/
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if (xfs_sb_version_has_pquotino(sbp))
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return;
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if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
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sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
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XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
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if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
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sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
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XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
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sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
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if (sbp->sb_qflags & XFS_PQUOTA_ACCT) {
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/*
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* In older version of superblock, on-disk superblock only
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* has sb_gquotino, and in-core superblock has both sb_gquotino
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* and sb_pquotino. But, only one of them is supported at any
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* point of time. So, if PQUOTA is set in disk superblock,
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* copy over sb_gquotino to sb_pquotino.
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*/
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sbp->sb_pquotino = sbp->sb_gquotino;
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sbp->sb_gquotino = NULLFSINO;
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}
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}
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void
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xfs_sb_from_disk(
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struct xfs_sb *to,
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xfs_dsb_t *from)
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{
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to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
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to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
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to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
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to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
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to->sb_rextents = be64_to_cpu(from->sb_rextents);
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memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
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to->sb_logstart = be64_to_cpu(from->sb_logstart);
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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);
|
|
to->sb_pad = 0;
|
|
to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
|
|
to->sb_lsn = be64_to_cpu(from->sb_lsn);
|
|
}
|
|
|
|
static inline void
|
|
xfs_sb_quota_to_disk(
|
|
xfs_dsb_t *to,
|
|
xfs_sb_t *from,
|
|
__int64_t *fields)
|
|
{
|
|
__uint16_t qflags = from->sb_qflags;
|
|
|
|
/*
|
|
* 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(from))
|
|
return;
|
|
|
|
if (*fields & XFS_SB_QFLAGS) {
|
|
/*
|
|
* 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);
|
|
*fields &= ~XFS_SB_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 ((*fields & XFS_SB_GQUOTINO) &&
|
|
(from->sb_qflags & XFS_GQUOTA_ACCT))
|
|
to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
|
|
else if ((*fields & XFS_SB_PQUOTINO) &&
|
|
(from->sb_qflags & XFS_PQUOTA_ACCT))
|
|
to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
|
|
|
|
*fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO);
|
|
}
|
|
|
|
/*
|
|
* Copy in core superblock to ondisk one.
|
|
*
|
|
* The fields argument is mask of superblock fields to copy.
|
|
*/
|
|
void
|
|
xfs_sb_to_disk(
|
|
xfs_dsb_t *to,
|
|
xfs_sb_t *from,
|
|
__int64_t fields)
|
|
{
|
|
xfs_caddr_t to_ptr = (xfs_caddr_t)to;
|
|
xfs_caddr_t from_ptr = (xfs_caddr_t)from;
|
|
xfs_sb_field_t f;
|
|
int first;
|
|
int size;
|
|
|
|
ASSERT(fields);
|
|
if (!fields)
|
|
return;
|
|
|
|
xfs_sb_quota_to_disk(to, from, &fields);
|
|
while (fields) {
|
|
f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
|
|
first = xfs_sb_info[f].offset;
|
|
size = xfs_sb_info[f + 1].offset - first;
|
|
|
|
ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
|
|
|
|
if (size == 1 || xfs_sb_info[f].type == 1) {
|
|
memcpy(to_ptr + first, from_ptr + first, size);
|
|
} else {
|
|
switch (size) {
|
|
case 2:
|
|
*(__be16 *)(to_ptr + first) =
|
|
cpu_to_be16(*(__u16 *)(from_ptr + first));
|
|
break;
|
|
case 4:
|
|
*(__be32 *)(to_ptr + first) =
|
|
cpu_to_be32(*(__u32 *)(from_ptr + first));
|
|
break;
|
|
case 8:
|
|
*(__be64 *)(to_ptr + first) =
|
|
cpu_to_be64(*(__u64 *)(from_ptr + first));
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
}
|
|
|
|
fields &= ~(1LL << f);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp));
|
|
|
|
/*
|
|
* 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_verify_cksum(bp->b_addr, be16_to_cpu(dsb->sb_sectsize),
|
|
offsetof(struct xfs_sb, sb_crc))) {
|
|
/* Only fail bad secondaries on a known V5 filesystem */
|
|
if (bp->b_bn != XFS_SB_DADDR &&
|
|
xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
error = EFSCORRUPTED;
|
|
goto out_error;
|
|
}
|
|
}
|
|
}
|
|
error = xfs_sb_verify(bp, true);
|
|
|
|
out_error:
|
|
if (error) {
|
|
if (error != EWRONGFS)
|
|
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
|
|
mp, bp->b_addr);
|
|
xfs_buf_ioerror(bp, error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
|
|
mp, bp->b_addr);
|
|
xfs_buf_ioerror(bp, error);
|
|
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_update_cksum(bp->b_addr, BBTOB(bp->b_length),
|
|
offsetof(struct xfs_sb, sb_crc));
|
|
}
|
|
|
|
const struct xfs_buf_ops xfs_sb_buf_ops = {
|
|
.verify_read = xfs_sb_read_verify,
|
|
.verify_write = xfs_sb_write_verify,
|
|
};
|
|
|
|
const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
|
|
.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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* Fixup the per-cpu counters as well. */
|
|
xfs_icsb_reinit_counters(mp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* xfs_mod_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_mod_sb(xfs_trans_t *tp, __int64_t fields)
|
|
{
|
|
xfs_buf_t *bp;
|
|
int first;
|
|
int last;
|
|
xfs_mount_t *mp;
|
|
xfs_sb_field_t f;
|
|
|
|
ASSERT(fields);
|
|
if (!fields)
|
|
return;
|
|
mp = tp->t_mountp;
|
|
bp = xfs_trans_getsb(tp, mp, 0);
|
|
first = sizeof(xfs_sb_t);
|
|
last = 0;
|
|
|
|
/* translate/copy */
|
|
|
|
xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
|
|
|
|
/* find modified range */
|
|
f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
|
|
ASSERT((1LL << f) & XFS_SB_MOD_BITS);
|
|
last = xfs_sb_info[f + 1].offset - 1;
|
|
|
|
f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
|
|
ASSERT((1LL << f) & XFS_SB_MOD_BITS);
|
|
first = xfs_sb_info[f].offset;
|
|
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
|
|
xfs_trans_log_buf(tp, bp, first, last);
|
|
}
|