tmpfs: generate random sb->s_uuid
This is used by overlayfs to encode intrasystem unique file handles. Suggested-by: Miklos Szeredi <mszeredi@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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