vfs pathname lookup: Add LOOKUP_AUTOMOUNT flag

Since we've now turned around and made LOOKUP_FOLLOW *not* force an
automount, we want to add the ability to force an automount event on
lookup even if we don't happen to have one of the other flags that force
it implicitly (LOOKUP_OPEN, LOOKUP_DIRECTORY, LOOKUP_PARENT..)

Most cases will never want to use this, since you'd normally want to
delay automounting as long as possible, which usually implies
LOOKUP_OPEN (when we open a file or directory, we really cannot avoid
the automount any more).

But Trond argued sufficiently forcefully that at a minimum bind mounting
a file and quotactl will want to force the automount lookup.  Some other
cases (like nfs_follow_remote_path()) could use it too, although
LOOKUP_DIRECTORY would work there as well.

This commit just adds the flag and logic, no users yet, though.  It also
doesn't actually touch the LOOKUP_NO_AUTOMOUNT flag that is related, and
was made irrelevant by the same change that made us not follow on
LOOKUP_FOLLOW.

Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Jeff Layton <jlayton@redhat.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Greg KH <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/namei.c b/fs/namei.c
index f4788365ea222676303b9fd7c2b40d4c2040fed1..09606fd83d577635872a984968c691ac2b602b6e 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -739,7 +739,7 @@ static int follow_automount(struct path *path, unsigned flags,
         * of the daemon to instantiate them before they can be used.
         */
        if (!(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
-                    LOOKUP_OPEN | LOOKUP_CREATE)) &&
+                    LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) &&
            path->dentry->d_inode)
                return -EISDIR;
 

diff --git a/include/linux/namei.h b/include/linux/namei.h
index 76fe2c62ae71b9661ea6728934fa6725dcdecd71..e13dac7caab249a0d8279591810d66748c11b7ae 100644 (file)
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -48,6 +48,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
  */
 #define LOOKUP_FOLLOW          0x0001
 #define LOOKUP_DIRECTORY       0x0002
+#define LOOKUP_AUTOMOUNT       0x0004
 
 #define LOOKUP_PARENT          0x0010
 #define LOOKUP_REVAL           0x0020