xfs: factor out scrub input checking

Do this before adding more core checks.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 53cd9df20ae6979851a269d6d0854a4401f60fc8..b0667420fcd573bdf8efba0fc5762f4cb13f7a8c 100644 (file)
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -284,47 +284,34 @@ xfs_scrub_experimental_warning(
 "EXPERIMENTAL online scrub feature in use. Use at your own risk!");
 }
 
-/* Dispatch metadata scrubbing. */
-int
-xfs_scrub_metadata(
-       struct xfs_inode                *ip,
+static int
+xfs_scrub_validate_inputs(
+       struct xfs_mount                *mp,
        struct xfs_scrub_metadata       *sm)
 {
-       struct xfs_scrub_context        sc;
-       struct xfs_mount                *mp = ip->i_mount;
+       int                             error;
        const struct xfs_scrub_meta_ops *ops;
-       bool                            try_harder = false;
-       int                             error = 0;
-
-       BUILD_BUG_ON(sizeof(meta_scrub_ops) !=
-               (sizeof(struct xfs_scrub_meta_ops) * XFS_SCRUB_TYPE_NR));
-
-       trace_xfs_scrub_start(ip, sm, error);
-
-       /* Forbidden if we are shut down or mounted norecovery. */
-       error = -ESHUTDOWN;
-       if (XFS_FORCED_SHUTDOWN(mp))
-               goto out;
-       error = -ENOTRECOVERABLE;
-       if (mp->m_flags & XFS_MOUNT_NORECOVERY)
-               goto out;
 
-       /* Check our inputs. */
        error = -EINVAL;
+       /* Check our inputs. */
        sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT;
        if (sm->sm_flags & ~XFS_SCRUB_FLAGS_IN)
                goto out;
        if (memchr_inv(sm->sm_reserved, 0, sizeof(sm->sm_reserved)))
                goto out;
 
-       /* Do we know about this type of metadata? */
        error = -ENOENT;
+       /* Do we know about this type of metadata? */
        if (sm->sm_type >= XFS_SCRUB_TYPE_NR)
                goto out;
        ops = &meta_scrub_ops[sm->sm_type];
        if (ops->setup == NULL || ops->scrub == NULL)
                goto out;
+       /* Does this fs even support this type of metadata? */
+       if (ops->has && !ops->has(&mp->m_sb))
+               goto out;
 
+       error = -EOPNOTSUPP;
        /*
         * We won't scrub any filesystem that doesn't have the ability
         * to record unwritten extents.  The option was made default in
@@ -334,20 +321,46 @@ xfs_scrub_metadata(
         * We also don't support v1-v3 filesystems, which aren't
         * mountable.
         */
-       error = -EOPNOTSUPP;
        if (!xfs_sb_version_hasextflgbit(&mp->m_sb))
                goto out;
 
-       /* Does this fs even support this type of metadata? */
-       error = -ENOENT;
-       if (ops->has && !ops->has(&mp->m_sb))
-               goto out;
-
        /* We don't know how to repair anything yet. */
-       error = -EOPNOTSUPP;
        if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)
                goto out;
 
+       error = 0;
+out:
+       return error;
+}
+
+/* Dispatch metadata scrubbing. */
+int
+xfs_scrub_metadata(
+       struct xfs_inode                *ip,
+       struct xfs_scrub_metadata       *sm)
+{
+       struct xfs_scrub_context        sc;
+       struct xfs_mount                *mp = ip->i_mount;
+       bool                            try_harder = false;
+       int                             error = 0;
+
+       BUILD_BUG_ON(sizeof(meta_scrub_ops) !=
+               (sizeof(struct xfs_scrub_meta_ops) * XFS_SCRUB_TYPE_NR));
+
+       trace_xfs_scrub_start(ip, sm, error);
+
+       /* Forbidden if we are shut down or mounted norecovery. */
+       error = -ESHUTDOWN;
+       if (XFS_FORCED_SHUTDOWN(mp))
+               goto out;
+       error = -ENOTRECOVERABLE;
+       if (mp->m_flags & XFS_MOUNT_NORECOVERY)
+               goto out;
+
+       error = xfs_scrub_validate_inputs(mp, sm);
+       if (error)
+               goto out;
+
        xfs_scrub_experimental_warning(mp);
 
 retry_op:
@@ -355,7 +368,7 @@ xfs_scrub_metadata(
        memset(&sc, 0, sizeof(sc));
        sc.mp = ip->i_mount;
        sc.sm = sm;
-       sc.ops = ops;
+       sc.ops = &meta_scrub_ops[sm->sm_type];
        sc.try_harder = try_harder;
        sc.sa.agno = NULLAGNUMBER;
        error = sc.ops->setup(&sc, ip);