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Don't bother with check_mnt() in do_add_mount() on shrinkable ones

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These guys are what we add as submounts; checks for "is that attached in
our namespace" are simply irrelevant for those and counterproductive for
use of private vfsmount trees a-la what NFS folks want.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-04-07 12:21:18 -04:00
parent 5b85711953
commit dd5cae6e97
1 changed files with 1 additions and 1 deletions
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2
fs/namespace.c
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@ -1698,7 +1698,7 @@ int do_add_mount(struct vfsmount *newmnt, struct path *path,
follow_down(&path->mnt, &path->dentry))
;
err = -EINVAL;
if (!check_mnt(path->mnt))
if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
goto unlock;
/* Refuse the same filesystem on the same mount point */