From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757427Ab0JJRA2 (ORCPT ); Sun, 10 Oct 2010 13:00:28 -0400 Received: from mail-ww0-f44.google.com ([74.125.82.44]:44743 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751813Ab0JJRA0 (ORCPT ); Sun, 10 Oct 2010 13:00:26 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :content-type:content-transfer-encoding; b=L2+ZAk8JQOS7RXUFO22J8vmesCJ8/Xra9+JTfSv4OwCrNs19XWLzxQSVVjWGhRlkl4 ZCgiOP9d8PkCx2kVlPAtjDZNmpdHMgNocwRu4fjm8eq7wfKsnOXGJ3AvIa5YjAft982P EO76Zs7BlX4DKRYykq6SBSMlofTwnmDLJwXDg= Message-ID: <4CB1EAAE.8010002@gmail.com> Date: Sun, 10 Oct 2010 18:32:46 +0200 From: Marco Stornelli User-Agent: Mozilla/5.0 (X11; U; Linux i686; it; rv:1.9.1.9) Gecko/20100317 SUSE/3.0.4-1.1.1 Thunderbird/3.0.4 MIME-Version: 1.0 To: Linux Kernel CC: Linux Embedded , Linux FS Devel , Tim Bird Subject: [PATCH 10/16] pramfs: xip operations Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Stornelli XIP operations. Signed-off-by: Marco Stornelli --- diff -Nurp linux-2.6.36-orig/fs/pramfs/xip.c linux-2.6.36/fs/pramfs/xip.c --- linux-2.6.36-orig/fs/pramfs/xip.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.36/fs/pramfs/xip.c 2010-09-14 18:49:52.000000000 +0200 @@ -0,0 +1,90 @@ +/* + * FILE NAME fs/pramfs/xip.c + * + * BRIEF DESCRIPTION + * + * XIP operations. + * + * Copyright 2009-2010 Marco Stornelli + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include "pram.h" +#include "xip.h" + +static int pram_find_and_alloc_blocks(struct inode *inode, sector_t iblock, + sector_t *data_block, int create) +{ + int err = -EIO; + u64 block; + + mutex_lock(&PRAM_I(inode)->truncate_lock); + + block = pram_find_data_block(inode, iblock); + + if (!block) { + if (!create) { + err = -ENODATA; + goto err; + } + + err = pram_alloc_blocks(inode, iblock, 1); + if (err) + goto err; + + block = pram_find_data_block(inode, iblock); + if (!block) { + err = -ENODATA; + goto err; + } + } + + *data_block = block; + err = 0; + + err: + mutex_unlock(&PRAM_I(inode)->truncate_lock); + return err; +} + + +static int __pram_get_block(struct inode *inode, pgoff_t pgoff, int create, + sector_t *result) +{ + int rc = 0; + sector_t iblock; + + /* find starting block number to access */ + iblock = (sector_t)pgoff << (PAGE_CACHE_SHIFT - inode->i_blkbits); + + rc = pram_find_and_alloc_blocks(inode, iblock, result, create); + + if (rc == -ENODATA) + BUG_ON(create); + + return rc; +} + +int pram_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, int create, + void **kmem, unsigned long *pfn) +{ + int rc; + sector_t block; + + /* first, retrieve the block */ + rc = __pram_get_block(mapping->host, pgoff, create, &block); + if (rc) + goto exit; + + *kmem = pram_get_block(mapping->host->i_sb, block); + *pfn = page_to_pfn(virt_to_page((unsigned long)*kmem)); + +exit: + return rc; +} diff -Nurp linux-2.6.36-orig/fs/pramfs/xip.h linux-2.6.36/fs/pramfs/xip.h --- linux-2.6.36-orig/fs/pramfs/xip.h 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.36/fs/pramfs/xip.h 2010-09-14 18:49:52.000000000 +0200 @@ -0,0 +1,24 @@ +/* + * FILE NAME fs/pramfs/xip.h + * + * BRIEF DESCRIPTION + * + * XIP operations. + * + * Copyright 2009-2010 Marco Stornelli + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifdef CONFIG_PRAMFS_XIP + +int pram_get_xip_mem(struct address_space *, pgoff_t, int, void **, + unsigned long *); + +#else + +#define pram_get_xip_mem NULL + +#endif +