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authorAmir Goldstein2017-05-18 15:29:33 +0300
committerChristoph Hellwig2017-06-05 16:59:19 +0200
commit2b4db79618ade14a9566455cbbea339f74674789 (patch)
tree25cb54994838d6cebba0ab3992c3bd97982eedae /mm
parentbf47643389bbc1164c2615dc420ed0010264222e (diff)
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/shmem.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index e67d6ba4e98e..391f2dcca727 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -75,6 +75,7 @@ static struct vfsmount *shm_mnt;
#include <uapi/linux/memfd.h>
#include <linux/userfaultfd_k.h>
#include <linux/rmap.h>
+#include <linux/uuid.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
@@ -3761,6 +3762,7 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent)
#ifdef CONFIG_TMPFS_POSIX_ACL
sb->s_flags |= MS_POSIXACL;
#endif
+ uuid_gen(&sb->s_uuid);
inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE);
if (!inode)