xfs: allow userspace to rebuild metadata structures

Source kernel commit: 5c83df2e54b6af870e3e02ccd2a8ecd54e36668c

Add a new (superuser-only) flag to the online metadata repair ioctl to
force it to rebuild structures, even if they're not broken.  We will use
this to move metadata structures out of the way during a free space
defragmentation operation.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h
index 2cbf9ea39b8cc4cbd6420ebd721d6e3045c3ed38..6360073865dbc3136e3655e1b493a53ca4310dd3 100644 (file)
--- a/libxfs/xfs_fs.h
+++ b/libxfs/xfs_fs.h
@@ -743,7 +743,11 @@ struct xfs_scrub_metadata {
  */
 #define XFS_SCRUB_OFLAG_NO_REPAIR_NEEDED (1u << 7)
 
-#define XFS_SCRUB_FLAGS_IN     (XFS_SCRUB_IFLAG_REPAIR)
+/* i: Rebuild the data structure. */
+#define XFS_SCRUB_IFLAG_FORCE_REBUILD  (1u << 8)
+
+#define XFS_SCRUB_FLAGS_IN     (XFS_SCRUB_IFLAG_REPAIR | \
+                                XFS_SCRUB_IFLAG_FORCE_REBUILD)
 #define XFS_SCRUB_FLAGS_OUT    (XFS_SCRUB_OFLAG_CORRUPT | \
                                 XFS_SCRUB_OFLAG_PREEN | \
                                 XFS_SCRUB_OFLAG_XFAIL | \