xfs: create inode pointer verifiers
Create some helper functions to check that inode pointers point to somewhere within the filesystem and not at the static AG metadata. Move xfs_internal_inum and create a directory inode check function. We will use these functions in scrub and elsewhere. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
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@ -30,6 +30,7 @@
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#include "xfs_bmap.h"
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#include "xfs_dir2.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_ialloc.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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@ -202,22 +203,8 @@ xfs_dir_ino_validate(
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xfs_mount_t *mp,
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xfs_ino_t ino)
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{
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xfs_agblock_t agblkno;
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xfs_agino_t agino;
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xfs_agnumber_t agno;
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int ino_ok;
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int ioff;
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bool ino_ok = xfs_verify_dir_ino(mp, ino);
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agno = XFS_INO_TO_AGNO(mp, ino);
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agblkno = XFS_INO_TO_AGBNO(mp, ino);
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ioff = XFS_INO_TO_OFFSET(mp, ino);
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agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
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ino_ok =
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agno < mp->m_sb.sb_agcount &&
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agblkno < mp->m_sb.sb_agblocks &&
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agblkno != 0 &&
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ioff < (1 << mp->m_sb.sb_inopblog) &&
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XFS_AGINO_TO_INO(mp, agno, agino) == ino;
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if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE))) {
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xfs_warn(mp, "Invalid inode number 0x%Lx",
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(unsigned long long) ino);
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@ -2664,3 +2664,93 @@ xfs_ialloc_pagi_init(
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xfs_trans_brelse(tp, bp);
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return 0;
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}
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/* Calculate the first and last possible inode number in an AG. */
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void
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xfs_ialloc_agino_range(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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xfs_agino_t *first,
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xfs_agino_t *last)
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{
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xfs_agblock_t bno;
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xfs_agblock_t eoag;
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eoag = xfs_ag_block_count(mp, agno);
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/*
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* Calculate the first inode, which will be in the first
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* cluster-aligned block after the AGFL.
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*/
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bno = round_up(XFS_AGFL_BLOCK(mp) + 1,
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xfs_ialloc_cluster_alignment(mp));
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*first = XFS_OFFBNO_TO_AGINO(mp, bno, 0);
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/*
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* Calculate the last inode, which will be at the end of the
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* last (aligned) cluster that can be allocated in the AG.
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*/
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bno = round_down(eoag, xfs_ialloc_cluster_alignment(mp));
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*last = XFS_OFFBNO_TO_AGINO(mp, bno, 0) - 1;
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}
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/*
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* Verify that an AG inode number pointer neither points outside the AG
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* nor points at static metadata.
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*/
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bool
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xfs_verify_agino(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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xfs_agino_t agino)
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{
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xfs_agino_t first;
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xfs_agino_t last;
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xfs_ialloc_agino_range(mp, agno, &first, &last);
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return agino >= first && agino <= last;
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}
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/*
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* Verify that an FS inode number pointer neither points outside the
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* filesystem nor points at static AG metadata.
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*/
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bool
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xfs_verify_ino(
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struct xfs_mount *mp,
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xfs_ino_t ino)
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{
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xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ino);
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xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
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if (agno >= mp->m_sb.sb_agcount)
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return false;
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if (XFS_AGINO_TO_INO(mp, agno, agino) != ino)
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return false;
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return xfs_verify_agino(mp, agno, agino);
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}
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/* Is this an internal inode number? */
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bool
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xfs_internal_inum(
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struct xfs_mount *mp,
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xfs_ino_t ino)
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{
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return ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
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(xfs_sb_version_hasquota(&mp->m_sb) &&
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xfs_is_quota_inode(&mp->m_sb, ino));
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}
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/*
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* Verify that a directory entry's inode number doesn't point at an internal
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* inode, empty space, or static AG metadata.
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*/
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bool
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xfs_verify_dir_ino(
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struct xfs_mount *mp,
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xfs_ino_t ino)
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{
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if (xfs_internal_inum(mp, ino))
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return false;
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return xfs_verify_ino(mp, ino);
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}
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@ -173,5 +173,12 @@ void xfs_inobt_btrec_to_irec(struct xfs_mount *mp, union xfs_btree_rec *rec,
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struct xfs_inobt_rec_incore *irec);
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int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
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void xfs_ialloc_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno,
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xfs_agino_t *first, xfs_agino_t *last);
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bool xfs_verify_agino(struct xfs_mount *mp, xfs_agnumber_t agno,
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xfs_agino_t agino);
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bool xfs_verify_ino(struct xfs_mount *mp, xfs_ino_t ino);
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bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
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bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino);
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#endif /* __XFS_IALLOC_H__ */
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@ -31,16 +31,6 @@
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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int
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xfs_internal_inum(
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xfs_mount_t *mp,
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xfs_ino_t ino)
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{
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return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
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(xfs_sb_version_hasquota(&mp->m_sb) &&
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xfs_is_quota_inode(&mp->m_sb, ino)));
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}
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/*
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* Return stat information for one inode.
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* Return 0 if ok, else errno.
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@ -96,6 +96,4 @@ xfs_inumbers(
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void __user *buffer, /* buffer with inode info */
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inumbers_fmt_pf formatter);
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int xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
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#endif /* __XFS_ITABLE_H__ */
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