NFSv4.1 fix infinite loop on IO BAD_STATEID error

[mirror_ubuntu-zesty-kernel.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 769903dbc19df53199b4aca2e79607145e179c98..b1ff5beebf4c5d11b43f1d7475a2dd4487e3873f 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1164,7 +1164,7 @@ enum d_walk_ret {
  *
  * The @enter() and @finish() callbacks are called with d_lock held.
  */
-static void d_walk(struct dentry *parent, void *data,
+void d_walk(struct dentry *parent, void *data,
                   enum d_walk_ret (*enter)(void *, struct dentry *),
                   void (*finish)(void *))
 {
@@ -1272,6 +1272,7 @@ rename_retry:
        seq = 1;
        goto again;
 }
+EXPORT_SYMBOL_GPL(d_walk);
 
 struct check_mount {
        struct vfsmount *mnt;
@@ -1336,8 +1337,11 @@ int d_set_mounted(struct dentry *dentry)
        }
        spin_lock(&dentry->d_lock);
        if (!d_unlinked(dentry)) {
-               dentry->d_flags |= DCACHE_MOUNTED;
-               ret = 0;
+               ret = -EBUSY;
+               if (!d_mountpoint(dentry)) {
+                       dentry->d_flags |= DCACHE_MOUNTED;
+                       ret = 0;
+               }
        }
        spin_unlock(&dentry->d_lock);
 out:
@@ -2861,6 +2865,7 @@ void d_exchange(struct dentry *dentry1, struct dentry *dentry2)
 
        write_sequnlock(&rename_lock);
 }
+EXPORT_SYMBOL_GPL(d_exchange);
 
 /**
  * d_ancestor - search for an ancestor