Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755459Ab0KASsU (ORCPT ); Mon, 1 Nov 2010 14:48:20 -0400 Received: from mail-gy0-f174.google.com ([209.85.160.174]:49923 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754024Ab0KASl7 (ORCPT ); Mon, 1 Nov 2010 14:41:59 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=ofFyzBUUZXEfbmE3IgPv2pR/Q4BQ3VdEKAnNbO/FhP+KdlXsotwZP3+MINLrVKe9+v uDU+VX0nApQFlZkWFM71lO370yMsjKLbU9Hg8LdH3WK4QvRLc+RJMeS+9Pi9e6B0lkhQ xi+qvtRHr0Gn4I/73q03+p0LfS0ctO7ddHRB0= From: Tracey Dent To: greg@kroah.com Cc: manningc2@actrix.gen.nz, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Tracey Dent Subject: [PATCH 12/29] Staging: yaffs2: yaffs_list.h: add file Date: Mon, 1 Nov 2010 14:41:00 -0400 Message-Id: <1288636877-7964-13-git-send-email-tdent48227@gmail.com> X-Mailer: git-send-email 1.7.3.2.146.gca209 In-Reply-To: <1288636877-7964-1-git-send-email-tdent48227@gmail.com> References: <1288636877-7964-1-git-send-email-tdent48227@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4004 Lines: 149 Adding files to yaffs2 directory. Signed-off-by: Tracey Dent --- drivers/staging/yaffs2/yaffs_list.h | 127 +++++++++++++++++++++++++++++++++++ 1 files changed, 127 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/yaffs2/yaffs_list.h diff --git a/drivers/staging/yaffs2/yaffs_list.h b/drivers/staging/yaffs2/yaffs_list.h new file mode 100644 index 0000000..145a1c5 --- /dev/null +++ b/drivers/staging/yaffs2/yaffs_list.h @@ -0,0 +1,127 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2010 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* + * This file is just holds extra declarations of macros that would normally + * be providesd in the Linux kernel. These macros have been written from + * scratch but are functionally equivalent to the Linux ones. + * + */ + +#ifndef __YAFFS_LIST_H__ +#define __YAFFS_LIST_H__ + + +#include "yportenv.h" + +/* + * This is a simple doubly linked list implementation that matches the + * way the Linux kernel doubly linked list implementation works. + */ + +struct ylist_head { + struct ylist_head *next; /* next in chain */ + struct ylist_head *prev; /* previous in chain */ +}; + + +/* Initialise a static list */ +#define YLIST_HEAD(name) \ +struct ylist_head name = { &(name), &(name)} + + + +/* Initialise a list head to an empty list */ +#define YINIT_LIST_HEAD(p) \ +do { \ + (p)->next = (p);\ + (p)->prev = (p); \ +} while (0) + + +/* Add an element to a list */ +static Y_INLINE void ylist_add(struct ylist_head *new_entry, + struct ylist_head *list) +{ + struct ylist_head *list_next = list->next; + + list->next = new_entry; + new_entry->prev = list; + new_entry->next = list_next; + list_next->prev = new_entry; + +} + +static Y_INLINE void ylist_add_tail(struct ylist_head *new_entry, + struct ylist_head *list) +{ + struct ylist_head *list_prev = list->prev; + + list->prev = new_entry; + new_entry->next = list; + new_entry->prev = list_prev; + list_prev->next = new_entry; + +} + + +/* Take an element out of its current list, with or without + * reinitialising the links.of the entry*/ +static Y_INLINE void ylist_del(struct ylist_head *entry) +{ + struct ylist_head *list_next = entry->next; + struct ylist_head *list_prev = entry->prev; + + list_next->prev = list_prev; + list_prev->next = list_next; + +} + +static Y_INLINE void ylist_del_init(struct ylist_head *entry) +{ + ylist_del(entry); + entry->next = entry->prev = entry; +} + + +/* Test if the list is empty */ +static Y_INLINE int ylist_empty(struct ylist_head *entry) +{ + return (entry->next == entry); +} + + +/* ylist_entry takes a pointer to a list entry and offsets it to that + * we can find a pointer to the object it is embedded in. + */ + + +#define ylist_entry(entry, type, member) \ + ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member))) + + +/* ylist_for_each and list_for_each_safe iterate over lists. + * ylist_for_each_safe uses temporary storage to make the list delete safe + */ + +#define ylist_for_each(itervar, list) \ + for (itervar = (list)->next; itervar != (list); itervar = itervar->next) + +#define ylist_for_each_safe(itervar, save_var, list) \ + for (itervar = (list)->next, save_var = (list)->next->next; \ + itervar != (list); itervar = save_var, save_var = save_var->next) + + +#endif -- 1.7.3.2.146.gca209 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/