Messages in this thread Patch in this message | | | Date | Tue, 16 Jul 2013 16:45:19 -0700 (PDT) | From | Rob Landley <> | Subject | [PATCH 1/5] initmpfs v2: replace MS_NOUSER in initramfs |
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From: Rob Landley <rob@landley.net>
Mounting MS_NOUSER prevents --bind mounts from rootfs. Prevent new rootfs mounts with a different mechanism that doesn't affect bind mounts.
Signed-off-by: Rob Landley <rob@landley.net> ---
fs/ramfs/inode.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index c24f1e1..14b9c35 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -247,7 +247,12 @@ struct dentry *ramfs_mount(struct file_system_type *fs_type, static struct dentry *rootfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { - return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super); + static unsigned long once; + + if (test_and_set_bit(1, &once)) + return ERR_PTR(-ENODEV); + + return mount_nodev(fs_type, flags, data, ramfs_fill_super); } static void ramfs_kill_sb(struct super_block *sb)
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