VFS: Fix the remaining automounter semantics regressions

The concensus seems to be that system calls such as stat() etc should
not trigger an automount.  Neither should the l* versions.

This patch therefore adds a LOOKUP_AUTOMOUNT flag to tag those lookups
that _should_ trigger an automount on the last path element.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[ Edited to leave out the cases that are already covered by LOOKUP_OPEN,
  LOOKUP_DIRECTORY and LOOKUP_CREATE - all of which also fundamentally
  force automounting for their own reasons   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 22bfe8273c68..b4febb29d3bb 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1757,7 +1757,7 @@ static int do_loopback(struct path *path, char *old_name,
                 return err;
         if (!old_name || !*old_name)
                 return -EINVAL;
-        err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
+        err = kern_path(old_name, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &old_path);
         if (err)
                 return err;