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xfs: split the xchk_bmap_check_rmaps into a predicate

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This function has two parts: the second part scans every reverse mapping
record for this file fork to make sure that there's a corresponding
mapping in the fork, and the first part decides if we even want to do
that.

Split the first part into a separate predicate so that we can make more
changes to it in the next patch.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:25 -07:00
parent 336642f792
commit e8882f69b9
1 changed files with 38 additions and 22 deletions
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60
fs/xfs/scrub/bmap.c
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@ -635,28 +635,28 @@ xchk_bmap_check_ag_rmaps(
return error;
}
/* Make sure each rmap has a corresponding bmbt entry. */
STATIC int
xchk_bmap_check_rmaps(
struct xfs_scrub *sc,
int whichfork)
/*
* Decide if we want to walk every rmap btree in the fs to make sure that each
* rmap for this file fork has corresponding bmbt entries.
*/
static bool
xchk_bmap_want_check_rmaps(
struct xchk_bmap_info *info)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(sc->ip, whichfork);
struct xfs_perag *pag;
xfs_agnumber_t agno;
struct xfs_scrub *sc = info->sc;
struct xfs_ifork *ifp;
bool zero_size;
int error;
if (!xfs_has_rmapbt(sc->mp) ||
whichfork == XFS_COW_FORK ||
(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return 0;
if (!xfs_has_rmapbt(sc->mp))
return false;
if (info->whichfork == XFS_COW_FORK)
return false;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return false;
/* Don't support realtime rmap checks yet. */
if (XFS_IS_REALTIME_INODE(sc->ip) && whichfork == XFS_DATA_FORK)
return 0;
ASSERT(xfs_ifork_ptr(sc->ip, whichfork) != NULL);
if (info->is_rt)
return false;
/*
* Only do this for complex maps that are in btree format, or for
@ -666,14 +666,28 @@ xchk_bmap_check_rmaps(
* reattached.
*/
if (whichfork == XFS_DATA_FORK)
if (info->whichfork == XFS_DATA_FORK)
zero_size = i_size_read(VFS_I(sc->ip)) == 0;
else
zero_size = false;
ifp = xfs_ifork_ptr(sc->ip, info->whichfork);
if (ifp->if_format != XFS_DINODE_FMT_BTREE &&
(zero_size || ifp->if_nextents > 0))
return 0;
return false;
return true;
}
/* Make sure each rmap has a corresponding bmbt entry. */
STATIC int
xchk_bmap_check_rmaps(
struct xfs_scrub *sc,
int whichfork)
{
struct xfs_perag *pag;
xfs_agnumber_t agno;
int error;
for_each_perag(sc->mp, agno, pag) {
error = xchk_bmap_check_ag_rmaps(sc, whichfork, pag);
@ -915,9 +929,11 @@ xchk_bmap(
memcpy(&info.prev_rec, &irec, sizeof(struct xfs_bmbt_irec));
}
error = xchk_bmap_check_rmaps(sc, whichfork);
if (!xchk_fblock_xref_process_error(sc, whichfork, 0, &error))
goto out;
if (xchk_bmap_want_check_rmaps(&info)) {
error = xchk_bmap_check_rmaps(sc, whichfork);
if (!xchk_fblock_xref_process_error(sc, whichfork, 0, &error))
goto out;
}
out:
return error;
}