[PATCH] autofs4 needs to force fail return revalidate

[linux-2.6-omap-h63xx.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index 6b591c01b09fcbff6775cbcb8ca7fc8a62c195ca..808e4ea2bb9413a446743fbcdf10caae8d0baf2f 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -372,6 +372,30 @@ void release_open_intent(struct nameidata *nd)
                fput(nd->intent.open.file);
 }
 
+static inline struct dentry *
+do_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+       int status = dentry->d_op->d_revalidate(dentry, nd);
+       if (unlikely(status <= 0)) {
+               /*
+                * The dentry failed validation.
+                * If d_revalidate returned 0 attempt to invalidate
+                * the dentry otherwise d_revalidate is asking us
+                * to return a fail status.
+                */
+               if (!status) {
+                       if (!d_invalidate(dentry)) {
+                               dput(dentry);
+                               dentry = NULL;
+                       }
+               } else {
+                       dput(dentry);
+                       dentry = ERR_PTR(status);
+               }
+       }
+       return dentry;
+}
+
 /*
  * Internal lookup() using the new generic dcache.
  * SMP-safe
@@ -386,12 +410,9 @@ static struct dentry * cached_lookup(struct dentry * parent, struct qstr * name,
        if (!dentry)
                dentry = d_lookup(parent, name);
 
-       if (dentry && dentry->d_op && dentry->d_op->d_revalidate) {
-               if (!dentry->d_op->d_revalidate(dentry, nd) && !d_invalidate(dentry)) {
-                       dput(dentry);
-                       dentry = NULL;
-               }
-       }
+       if (dentry && dentry->d_op && dentry->d_op->d_revalidate)
+               dentry = do_revalidate(dentry, nd);
+
        return dentry;
 }
 
@@ -484,10 +505,9 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
         */
        mutex_unlock(&dir->i_mutex);
        if (result->d_op && result->d_op->d_revalidate) {
-               if (!result->d_op->d_revalidate(result, nd) && !d_invalidate(result)) {
-                       dput(result);
+               result = do_revalidate(result, nd);
+               if (!result)
                        result = ERR_PTR(-ENOENT);
-               }
        }
        return result;
 }
@@ -767,12 +787,12 @@ need_lookup:
        goto done;
 
 need_revalidate:
-       if (dentry->d_op->d_revalidate(dentry, nd))
-               goto done;
-       if (d_invalidate(dentry))
-               goto done;
-       dput(dentry);
-       goto need_lookup;
+       dentry = do_revalidate(dentry, nd);
+       if (!dentry)
+               goto need_lookup;
+       if (IS_ERR(dentry))
+               goto fail;
+       goto done;
 
 fail:
        return PTR_ERR(dentry);