ext4: Copy fs UUID to superblock

File system UUID is made available to application
via  /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f6a318f836b2cd7d5c2e70af3ae1bde6b6d301ce..5977b356a43531e60adcc54cf46dff972e379899 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3415,6 +3415,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        sb->s_qcop = &ext4_qctl_operations;
        sb->dq_op = &ext4_quota_operations;
 #endif
+       memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
+
        INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
        mutex_init(&sbi->s_orphan_lock);
        mutex_init(&sbi->s_resize_lock);