[Cluster-devel] [PATCH 1/2] libgfs2: patch to update gfs1 superblock correctly

[Abhi Das]

gfs2-utils uses the gfs2_sb structure as a template to operate on
both gfs1 and gfs2 superblocks. Some fields of the gfs1 superblock
are not in gfs2 and are replaced by padded fields. These padded
fields were not being written out after modification and were
instead being zeroed out, thereby causing corruption.
This patch fixes gfs2_sb_out() to write out the padded fields.

Resolves: rhbz#1053668
Signed-off-by: Abhi Das <adas at redhat.com>
---
 gfs2/libgfs2/ondisk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gfs2/libgfs2/ondisk.c b/gfs2/libgfs2/ondisk.c
index dcc537e..3fbc63f 100644
--- a/gfs2/libgfs2/ondisk.c
+++ b/gfs2/libgfs2/ondisk.c
@@ -132,15 +132,20 @@ void gfs2_sb_out(const struct gfs2_sb *sb, char *buf)
 
 	CPOUT_32(sb, str, sb_fs_format);
 	CPOUT_32(sb, str, sb_multihost_format);
+	CPOUT_32(sb, str, __pad0);                        /* gfs sb_flags */
 
 	CPOUT_32(sb, str, sb_bsize);
 	CPOUT_32(sb, str, sb_bsize_shift);
+	CPOUT_32(sb, str, __pad1);                        /* gfs sb_seg_size */
 
 	gfs2_inum_out(&sb->sb_master_dir, (char *)&str->sb_master_dir);
 	gfs2_inum_out(&sb->sb_root_dir, (char *)&str->sb_root_dir);
 
 	CPOUT_08(sb, str, sb_lockproto, GFS2_LOCKNAME_LEN);
 	CPOUT_08(sb, str, sb_locktable, GFS2_LOCKNAME_LEN);
+	gfs2_inum_out(&sb->__pad2, (char *)&str->__pad2); /* gfs rindex */
+	gfs2_inum_out(&sb->__pad3, (char *)&str->__pad3); /* gfs quota */
+	gfs2_inum_out(&sb->__pad4, (char *)&str->__pad4); /* gfs license */
 #ifdef GFS2_HAS_UUID
 	memcpy(str->sb_uuid, sb->sb_uuid, 16);
 #endif
-- 
1.8.1.4