Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932329AbZFMN27 (ORCPT ); Sat, 13 Jun 2009 09:28:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932188AbZFMN1I (ORCPT ); Sat, 13 Jun 2009 09:27:08 -0400 Received: from mail-fx0-f216.google.com ([209.85.220.216]:37936 "EHLO mail-fx0-f216.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932161AbZFMN1F (ORCPT ); Sat, 13 Jun 2009 09:27:05 -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=qfi83OxJWhgWrGYzdQ1LbuGxEpDGtie1HR8oke1cfIEjI35tIDNHm5cAPSx8pqsjU+ arHSZAWJvHj3SZsOSXyJCYVtgZW7GjftM3XY24xheDT2FXlGyYRirFYJVwoy/YNgzVTc 9rxTmDoQrVxCoV0zi1oa9CdYRFdh61FDW4SxQ= Message-ID: <4A33A841.6080902@gmail.com> Date: Sat, 13 Jun 2009 15:23:13 +0200 From: Marco User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: Linux FS Devel CC: Linux Embedded , Linux Kernel , Daniel Walker Subject: [PATCH 14/14] Pramfs: XIP operations Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3232 Lines: 136 From: Marco Stornelli XIP operations. Signed-off-by: Marco Stornelli --- diff -uprN linux-2.6.30-orig/fs/pramfs/xip.c linux-2.6.30/fs/pramfs/xip.c --- linux-2.6.30-orig/fs/pramfs/xip.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.30/fs/pramfs/xip.c 2009-06-13 12:54:26.000000000 +0200 @@ -0,0 +1,90 @@ +/* + * FILE NAME fs/pramfs/xip.c + * + * BRIEF DESCRIPTION + * + * XIP operations. + * + * Copyright 2009 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_fs.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; + off_t block; + + lock_kernel(); + + 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: + unlock_kernel(); + 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 -uprN linux-2.6.30-orig/fs/pramfs/xip.h linux-2.6.30/fs/pramfs/xip.h --- linux-2.6.30-orig/fs/pramfs/xip.h 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.30/fs/pramfs/xip.h 2009-03-28 14:59:13.000000000 +0100 @@ -0,0 +1,25 @@ +/* + * FILE NAME fs/pramfs/xip.h + * + * BRIEF DESCRIPTION + * + * XIP operations. + * + * Author: 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 + -- 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/