Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6

* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6: (61 commits)
  sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes
  sysfs: make directory dentries and inodes reclaimable
  sysfs: implement sysfs_get_dentry()
  sysfs: move sysfs_drop_dentry() to dir.c and make it static
  sysfs: restructure add/remove paths and fix inode update
  sysfs: use sysfs_mutex to protect the sysfs_dirent tree
  sysfs: consolidate sysfs spinlocks
  sysfs: make kobj point to sysfs_dirent instead of dentry
  sysfs: implement sysfs_find_dirent() and sysfs_get_dirent()
  sysfs: implement SYSFS_FLAG_REMOVED flag
  sysfs: rename sysfs_dirent->s_type to s_flags and make room for flags
  sysfs: make sysfs_drop_dentry() access inodes using ilookup()
  sysfs: Fix oops in sysfs_drop_dentry on x86_64
  sysfs: use singly-linked list for sysfs_dirent tree
  sysfs: slim down sysfs_dirent->s_active
  sysfs: move s_active functions to fs/sysfs/dir.c
  sysfs: fix root sysfs_dirent -> root dentry association
  sysfs: use iget_locked() instead of new_inode()
  sysfs: reorganize sysfs_new_indoe() and sysfs_create()
  sysfs: fix parent refcounting during rename and move
  ...

1 files changed, 63 insertions, 0 deletions

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index ec8896b264de..1d533a2ec3a6 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -368,6 +368,69 @@ void debugfs_remove(struct dentry *dentry)
 }
 EXPORT_SYMBOL_GPL(debugfs_remove);
 
+/**
+ * debugfs_rename - rename a file/directory in the debugfs filesystem
+ * @old_dir: a pointer to the parent dentry for the renamed object. This
+ *          should be a directory dentry.
+ * @old_dentry: dentry of an object to be renamed.
+ * @new_dir: a pointer to the parent dentry where the object should be
+ *          moved. This should be a directory dentry.
+ * @new_name: a pointer to a string containing the target name.
+ *
+ * This function renames a file/directory in debugfs.  The target must not
+ * exist for rename to succeed.
+ *
+ * This function will return a pointer to old_dentry (which is updated to
+ * reflect renaming) if it succeeds. If an error occurs, %NULL will be
+ * returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -%ENODEV will be
+ * returned.
+ */
+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+                struct dentry *new_dir, const char *new_name)
+{
+        int error;
+        struct dentry *dentry = NULL, *trap;
+        const char *old_name;
+
+        trap = lock_rename(new_dir, old_dir);
+        /* Source or destination directories don't exist? */
+        if (!old_dir->d_inode || !new_dir->d_inode)
+                goto exit;
+        /* Source does not exist, cyclic rename, or mountpoint? */
+        if (!old_dentry->d_inode || old_dentry == trap ||
+            d_mountpoint(old_dentry))
+                goto exit;
+        dentry = lookup_one_len(new_name, new_dir, strlen(new_name));
+        /* Lookup failed, cyclic rename or target exists? */
+        if (IS_ERR(dentry) || dentry == trap || dentry->d_inode)
+                goto exit;
+
+        old_name = fsnotify_oldname_init(old_dentry->d_name.name);
+
+        error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode,
+                dentry);
+        if (error) {
+                fsnotify_oldname_free(old_name);
+                goto exit;
+        }
+        d_move(old_dentry, dentry);
+        fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name,
+                old_dentry->d_name.name, S_ISDIR(old_dentry->d_inode->i_mode),
+                NULL, old_dentry->d_inode);
+        fsnotify_oldname_free(old_name);
+        unlock_rename(new_dir, old_dir);
+        dput(dentry);
+        return old_dentry;
+exit:
+        if (dentry && !IS_ERR(dentry))
+                dput(dentry);
+        unlock_rename(new_dir, old_dir);
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(debugfs_rename);
+
 static decl_subsys(debug, NULL, NULL);
 
 static int __init debugfs_init(void)