From: Andries E. Brouwer Date: Wed, 6 Feb 2008 09:36:32 +0000 (-0800) Subject: MNT_UNBINDABLE fix X-Git-Tag: v2.6.25-rc1~753 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0b03cfb25fa944bc106e816146846dcb48b2e907;p=linux.git MNT_UNBINDABLE fix Some time ago ( http://lkml.org/lkml/2007/6/19/128 ) I wrote about MNT_UNBINDABLE that it felt like a bug that it is not reset by "mount --make-private". Today I happened to see mount(8) and Documentation/sharedsubtree.txt and both document the version obtained by applying the little patch given in the above (and again below). So, the present kernel code is not according to specs and must be regarded as buggy. Specification in Documentation/sharedsubtree.txt: See state diagram: unbindable should become private upon make-private. Specification in mount(8): ... It's also possible to set up uni-directional propagation (with --make- slave), to make a mount point unavailable for --bind/--rbind (with --make-unbindable), and to undo any of these (with --make-private). Repeat of old fix-shared-subtrees-make-private.patch (due to Dirk Gerrits, René Gabriëls, Peter Kooijmans): Acked-by: Ram Pai Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/pnode.c b/fs/pnode.c index 89940f243fc2..05ba692bc540 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -83,6 +83,8 @@ void change_mnt_propagation(struct vfsmount *mnt, int type) mnt->mnt_master = NULL; if (type == MS_UNBINDABLE) mnt->mnt_flags |= MNT_UNBINDABLE; + else + mnt->mnt_flags &= ~MNT_UNBINDABLE; } }