VFS: Log the fact that we've given ELOOP rather than creating a loop

[pandora-kernel.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index a901c69..10ba92d 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -36,6 +36,7 @@
 #include <linux/bit_spinlock.h>
 #include <linux/rculist_bl.h>
 #include <linux/prefetch.h>
+#include <linux/ratelimit.h>
 #include "internal.h"
 
 /*
@@ -2383,8 +2384,16 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
                                actual = __d_unalias(inode, dentry, alias);
                        }
                        write_sequnlock(&rename_lock);
-                       if (IS_ERR(actual))
+                       if (IS_ERR(actual)) {
+                               if (PTR_ERR(actual) == -ELOOP)
+                                       pr_warn_ratelimited(
+                                               "VFS: Lookup of '%s' in %s %s"
+                                               " would have caused loop\n",
+                                               dentry->d_name.name,
+                                               inode->i_sb->s_type->name,
+                                               inode->i_sb->s_id);
                                dput(alias);
+                       }
                        goto out_nolock;
                }
        }