tree 988cb5b1446ecc298aee4771b0768d777165226c
parent 6d59e7f582ef1c1988542d0fc3b36d0087b757ce
author Al Viro <viro@zeniv.linux.org.uk> 1206217189 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1208833869 -0400

[PATCH] lock exclusively in collect_mounts() and drop_collected_mounts()

Taking namespace_sem shared there isn't worth the trouble, especially with
vfsmount ID allocation about to be added.  That way we know that umount_tree(),
copy_tree() and clone_mnt() are _always_ serialized by namespace_sem.
umount_tree() still needs vfsmount_lock (it manipulates hash chains, among
other things), but that's a separate story.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>