[PATCH] autofs4: can't mount due to mount point dir not empty

Addresse a problem where stale dentrys stop mounts from happening.

When a mount point directory is pre-created and a non-existent entry within it
is requested a dentry ends up being created within the mount point directory
which stops future mounts.  The problem is solved by ignoring negative,
unhashed dentrys in the mount point d_subdirs list.

Additionally the apparent cacheing of -ENOENT returns from requests is
removed.  The test on d_time is a tautology and d_time is not initialised and
has an unexpected value.  In short it doesn't do what it's meant to.

The cacheing of failed requests to the daemon is important and will be
followed up later.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index af9a4c6bbadf..c7ff35774344 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -294,14 +294,13 @@ static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int f
 
                 /* Turn this into a real negative dentry? */
                 if (status == -ENOENT) {
-                        dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
                         spin_lock(&dentry->d_lock);
                         dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
                         spin_unlock(&dentry->d_lock);
-                        return 1;
+                        return 0;
                 } else if (status) {
                         /* Return a negative dentry, but leave it "pending" */
-                        return 1;
+                        return 0;
                 }
         /* Trigger mount for path component or follow link */
         } else if (flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) ||
@@ -360,13 +359,13 @@ static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
 
         /* Negative dentry.. invalidate if "old" */
         if (dentry->d_inode == NULL)
-                return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
+                return 0;
 
         /* Check for a non-mountpoint directory with no contents */
         spin_lock(&dcache_lock);
         if (S_ISDIR(dentry->d_inode->i_mode) &&
             !d_mountpoint(dentry) && 
-            list_empty(&dentry->d_subdirs)) {
+            simple_empty_nolock(dentry)) {
                 DPRINTK("dentry=%p %.*s, emptydir",
                          dentry, dentry->d_name.len, dentry->d_name.name);
                 spin_unlock(&dcache_lock);