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authorDavid Howells <dhowells@redhat.com>2011-07-11 14:20:57 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2011-08-01 01:38:01 -0400
commit5a30d8a2b8ddd5102c440c7e5a7c8e1fd729c818 (patch)
tree005d290c2390207a485042687ca018afbefa2993 /fs/namei.c
parentb4aff1f874f679320c03e3d97b60fc7babfd4623 (diff)
downloadlinux-5a30d8a2b8ddd5102c440c7e5a7c8e1fd729c818.tar.bz2
VFS: Fix automount for negative autofs dentries
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>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/fs/namei.c b/fs/namei.c
index f8c69d373793..445fd5da11fa 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -716,19 +716,25 @@ static int follow_automount(struct path *path, unsigned flags,
if ((flags & LOOKUP_NO_AUTOMOUNT) && !(flags & LOOKUP_PARENT))
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_PARENT | 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_PARENT | LOOKUP_DIRECTORY |
+ LOOKUP_OPEN | LOOKUP_CREATE)) &&
+ path->dentry->d_inode)
+ return -EISDIR;
+ }
current->total_link_count++;
if (current->total_link_count >= 40)
return -ELOOP;