[PATCH 3/4] xfs_mdrestore: recalculate sb CRC before writing

[Dave Chinner]

From: Dave Chinner <dchinner at redhat.com>

xfs_mdrestore writes the superblock after modifying it, and so the
CRC is not necessarily correct. make sure the CRC is correct
before we write the superblock back.

Signed-off-by: Dave Chinner <dchinner at redhat.com>
---
 mdrestore/xfs_mdrestore.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mdrestore/xfs_mdrestore.c b/mdrestore/xfs_mdrestore.c
index 479e677..e57bdb2 100644
--- a/mdrestore/xfs_mdrestore.c
+++ b/mdrestore/xfs_mdrestore.c
@@ -169,6 +169,11 @@ perform_restore(
 	memset(block_buffer, 0, sb.sb_sectsize);
 	sb.sb_inprogress = 0;
 	libxfs_sb_to_disk((xfs_dsb_t *)block_buffer, &sb, XFS_SB_ALL_BITS);
+	if (xfs_sb_version_hascrc(&sb)) {
+		xfs_update_cksum(block_buffer, sb.sb_sectsize,
+				 offsetof(struct xfs_sb, sb_crc));
+	}
+
 	if (pwrite(dst_fd, block_buffer, sb.sb_sectsize, 0) < 0)
 		fatal("error writing primary superblock: %s\n", strerror(errno));
 
-- 
1.7.10.4