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c7e693d983
Check the reverse mapping records to make sure that the contents make sense. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_btree.h"
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#include "xfs_bit.h"
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#include "xfs_log_format.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_alloc.h"
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#include "xfs_ialloc.h"
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#include "xfs_rmap.h"
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#include "scrub/xfs_scrub.h"
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#include "scrub/scrub.h"
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#include "scrub/common.h"
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#include "scrub/btree.h"
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#include "scrub/trace.h"
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/*
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* Set us up to scrub reverse mapping btrees.
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*/
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int
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xfs_scrub_setup_ag_rmapbt(
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struct xfs_scrub_context *sc,
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struct xfs_inode *ip)
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{
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return xfs_scrub_setup_ag_btree(sc, ip, false);
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}
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/* Reverse-mapping scrubber. */
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/* Scrub an rmapbt record. */
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STATIC int
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xfs_scrub_rmapbt_rec(
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struct xfs_scrub_btree *bs,
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union xfs_btree_rec *rec)
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{
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struct xfs_mount *mp = bs->cur->bc_mp;
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struct xfs_rmap_irec irec;
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xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
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bool non_inode;
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bool is_unwritten;
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bool is_bmbt;
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bool is_attr;
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int error;
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error = xfs_rmap_btrec_to_irec(rec, &irec);
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if (!xfs_scrub_btree_process_error(bs->sc, bs->cur, 0, &error))
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goto out;
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/* Check extent. */
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if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock)
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (irec.rm_owner == XFS_RMAP_OWN_FS) {
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/*
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* xfs_verify_agbno returns false for static fs metadata.
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* Since that only exists at the start of the AG, validate
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* that by hand.
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*/
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if (irec.rm_startblock != 0 ||
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irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1)
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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} else {
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/*
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* Otherwise we must point somewhere past the static metadata
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* but before the end of the FS. Run the regular check.
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*/
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if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) ||
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!xfs_verify_agbno(mp, agno, irec.rm_startblock +
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irec.rm_blockcount - 1))
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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}
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/* Check flags. */
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non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
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is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
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is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
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is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
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if (is_bmbt && irec.rm_offset != 0)
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (non_inode && irec.rm_offset != 0)
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (is_unwritten && (is_bmbt || non_inode || is_attr))
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (non_inode && (is_bmbt || is_unwritten || is_attr))
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (!non_inode) {
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if (!xfs_verify_ino(mp, irec.rm_owner))
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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} else {
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/* Non-inode owner within the magic values? */
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if (irec.rm_owner <= XFS_RMAP_OWN_MIN ||
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irec.rm_owner > XFS_RMAP_OWN_FS)
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xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
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}
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out:
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return error;
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}
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/* Scrub the rmap btree for some AG. */
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int
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xfs_scrub_rmapbt(
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struct xfs_scrub_context *sc)
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{
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struct xfs_owner_info oinfo;
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xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
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return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_rec,
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&oinfo, NULL);
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}
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