diff options
| author | David Howells <dhowells@redhat.com> | 2011-10-25 13:59:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 09:36:20 -0800 |
| commit | f537ffabb3ed687da15ec46d72c839971b142d0a (patch) | |
| tree | 9f6d2d94280bc07d9552f36647ac143f4e60e36b | |
| parent | b0917c31699319f0b0ce0747e26bd66e8ed83491 (diff) | |
VFS: Fix automount for negative autofs dentries
commit 5a30d8a2b8ddd5102c440c7e5a7c8e1fd729c818 upstream.
[ backport for 3.0.x: LOOKUP_PARENT => LOOKUP_CONTINUE by Chuck Ebbert
<cebbert@redhat.com> ]
Autofs may set the DCACHE_NEED_AUTOMOUNT flag on negative dentries. These
need attention from the automounter daemon regardless of the LOOKUP_FOLLOW flag.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/namei.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/fs/namei.c b/fs/namei.c index 7bab4add8a1..80e239d685c 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -781,19 +781,25 @@ static int follow_automount(struct path *path, unsigned flags, if ((flags & LOOKUP_NO_AUTOMOUNT) && !(flags & LOOKUP_CONTINUE)) return -EISDIR; /* we actually want to stop here */ - /* We want to mount if someone is trying to open/create a file of any - * type under the mountpoint, wants to traverse through the mountpoint - * or wants to open the mounted directory. - * + /* * We don't want to mount if someone's just doing a stat and they've * set AT_SYMLINK_NOFOLLOW - unless they're stat'ing a directory and * appended a '/' to the name. */ - if (!(flags & LOOKUP_FOLLOW) && - !(flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY | - LOOKUP_OPEN | LOOKUP_CREATE))) - return -EISDIR; - + if (!(flags & LOOKUP_FOLLOW)) { + /* We do, however, want to mount if someone wants to open or + * create a file of any type under the mountpoint, wants to + * traverse through the mountpoint or wants to open the mounted + * directory. + * Also, autofs may mark negative dentries as being automount + * points. These will need the attentions of the daemon to + * instantiate them before they can be used. + */ + if (!(flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY | + LOOKUP_OPEN | LOOKUP_CREATE)) && + path->dentry->d_inode) + return -EISDIR; + } current->total_link_count++; if (current->total_link_count >= 40) return -ELOOP; |