debugfs: add rename for debugfs files

Implement debugfs_rename() to allow renaming files/directories in debugfs.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index ec8896b..1d533a2 100644 (file)
--- 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)

diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 5a9c495..104e51e 100644 (file)
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -38,6 +38,9 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
 
 void debugfs_remove(struct dentry *dentry);
 
+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+                struct dentry *new_dir, const char *new_name);
+
 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
                                 struct dentry *parent, u8 *value);
 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
@@ -85,6 +88,12 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
 static inline void debugfs_remove(struct dentry *dentry)
 { }
 
+static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+                struct dentry *new_dir, char *new_name)
+{
+       return ERR_PTR(-ENODEV);
+}
+
 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
                                               struct dentry *parent,
                                               u8 *value)