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Commit 2b4db796 authored by Amir Goldstein's avatar Amir Goldstein Committed by Christoph Hellwig
Browse files

tmpfs: generate random sb->s_uuid 



This is used by overlayfs to encode intrasystem unique file handles.

Suggested-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent bf476433

mm/shmem.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -75,6 +75,7 @@ static struct vfsmount *shm_mnt; 
#include <uapi/linux/memfd.h>

#include <uapi/linux/memfd.h>

#include <linux/userfaultfd_k.h>

#include <linux/userfaultfd_k.h>

#include <linux/rmap.h>

#include <linux/rmap.h>

#include <linux/uuid.h>





#include <linux/uaccess.h>

#include <linux/uaccess.h>

#include <asm/pgtable.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

#ifdef CONFIG_TMPFS_POSIX_ACL

	sb->s_flags |= MS_POSIXACL;

	sb->s_flags |= MS_POSIXACL;

#endif

#endif

	uuid_gen(&sb->s_uuid);





	inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE);

	inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE);

	if (!inode)

	if (!inode)