fs: switch ->s_uuid to uuid_t

For some file systems we still memcpy into it, but in various places this
already allows us to use the proper uuid helpers.  More to come..

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com> (Changes to IMA/EVM)
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 7a44533f4bbf..d55fceb4e414 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -284,7 +284,6 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
                           struct dentry *upper)
 {
         struct super_block *sb = lower->d_sb;
-        uuid_be *uuid = (uuid_be *) &sb->s_uuid;
         const struct ovl_fh *fh = NULL;
         int err;
 
@@ -294,8 +293,8 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
          * up and a pure upper inode.
          */
         if (sb->s_export_op && sb->s_export_op->fh_to_dentry &&
-            uuid_be_cmp(*uuid, NULL_UUID_BE)) {
-                fh = ovl_encode_fh(lower, uuid);
+            !uuid_is_null(&sb->s_uuid)) {
+                fh = ovl_encode_fh(lower, &sb->s_uuid);
                 if (IS_ERR(fh))
                         return PTR_ERR(fh);
         }