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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-25 13:59:48 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:36:23 -0800
commiteb4b2df8f20d4479eceeb9bc51695caaa7bcd229 (patch)
treeee209363a04b46e9d7a30e38e166a6d5eb70cff0 /fs
parent6c36547293e6c46fe5df46e5e1b9ce9babb9eb37 (diff)
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c
index fc12ad53ecd2..49472a1b79e7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -793,7 +793,7 @@ static int follow_automount(struct path *path, unsigned flags,
* of the daemon to instantiate them before they can be used.
*/
if (!(flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY |
- LOOKUP_OPEN | LOOKUP_CREATE)) &&
+ LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) &&
path->dentry->d_inode)
return -EISDIR;