4 files changed, 34 insertions, 6 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index c7b2b8890188..9c09641ce907 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -185,6 +185,19 @@ int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
 void autofs4_catatonic_mode(struct autofs_sb_info *);
 
+static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry)
+{
+        int res = 0;
+
+        while (d_mountpoint(*dentry)) {
+                int followed = follow_down(mnt, dentry);
+                if (!followed)
+                        break;
+                res = 1;
+        }
+        return res;
+}
+
 static inline int simple_positive(struct dentry *dentry)
 {
         return dentry->d_inode && !d_unhashed(dentry);
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 500425e24fba..feb6ac427d05 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -56,12 +56,9 @@ static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry)
         mntget(mnt);
         dget(dentry);
 
-        if (!follow_down(&mnt, &dentry))
+        if (!autofs4_follow_mount(&mnt, &dentry))
                 goto done;
 
-        while (d_mountpoint(dentry) && follow_down(&mnt, &dentry))
-                ;
-
         /* This is an autofs submount, we can't expire it */
         if (is_autofs4_dentry(dentry))
                 goto done;
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 3765c047f157..2a771ec66956 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -205,7 +205,11 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
                 struct vfsmount *fp_mnt = mntget(mnt);
                 struct dentry *fp_dentry = dget(dentry);
 
-                while (follow_down(&fp_mnt, &fp_dentry) && d_mountpoint(fp_dentry));
+                if (!autofs4_follow_mount(&fp_mnt, &fp_dentry)) {
+                        dput(fp_dentry);
+                        mntput(fp_mnt);
+                        return -ENOENT;
+                }
 
                 fp = dentry_open(fp_dentry, fp_mnt, file->f_flags);
                 status = PTR_ERR(fp);
@@ -302,7 +306,14 @@ static int try_to_fill_dentry(struct dentry *dentry,
                 
                 DPRINTK("expire done status=%d", status);
                 
-                return 0;
+                /*
+                 * If the directory still exists the mount request must
+                 * continue otherwise it can't be followed at the right
+                 * time during the walk.
+                 */
+                status = d_invalidate(dentry);
+                if (status != -EBUSY)
+                        return 0;
         }
 
         DPRINTK("dentry=%p %.*s ino=%p",
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 5a40d36e5a51..fa2348dcd671 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -191,6 +191,13 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
         }
 
         if ( !wq ) {
+                /* Can't wait for an expire if there's no mount */
+                if (notify == NFY_NONE && !d_mountpoint(dentry)) {
+                        kfree(name);
+                        up(&sbi->wq_sem);
+                        return -ENOENT;
+                }
+
                 /* Create a new wait queue */
                 wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
                 if ( !wq ) {