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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f6a318f836b2..5977b356a435 100644
--- 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);