From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933301AbWFZW4Z (ORCPT ); Mon, 26 Jun 2006 18:56:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933295AbWFZWk3 (ORCPT ); Mon, 26 Jun 2006 18:40:29 -0400 Received: from cust9421.vic01.dataco.com.au ([203.171.70.205]:27319 "EHLO nigel.suspend2.net") by vger.kernel.org with ESMTP id S933294AbWFZWkJ (ORCPT ); Mon, 26 Jun 2006 18:40:09 -0400 From: Nigel Cunningham Subject: [Suspend2][ 19/35] [Suspend2] Filewriter header reading initialisation. Date: Tue, 27 Jun 2006 08:40:07 +1000 To: linux-kernel@vger.kernel.org Message-Id: <20060626224006.4685.9113.stgit@nigel.suspend2.net> In-Reply-To: <20060626223902.4685.52543.stgit@nigel.suspend2.net> References: <20060626223902.4685.52543.stgit@nigel.suspend2.net> Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit User-Agent: StGIT/0.9 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Shared initialisation when reading a filewriter image header. Signed-off-by: Nigel Cunningham kernel/power/suspend_file.c | 62 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 62 insertions(+), 0 deletions(-) diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c index 1dd082f..da50422 100644 --- a/kernel/power/suspend_file.c +++ b/kernel/power/suspend_file.c @@ -594,3 +594,65 @@ static int file_init(void) return 0; } +/* + * read_header_init() + * + * Ramdisk support based heavily on init/do_mounts_rd.c + * + * Description: + * 1. Attempt to read the device specified with resume2=. + * 2. Check the contents of the header for our signature. + * 3. Warn, ignore, reset and/or continue as appropriate. + * 4. If continuing, read the filewriter configuration section + * of the header and set up block device info so we can read + * the rest of the header & image. + * + * Returns: + * May not return if user choose to reboot at a warning. + * -EINVAL if cannot resume at this time. Booting should continue + * normally. + */ + +static int filewriter_read_header_init(void) +{ + int result; + struct block_device *tmp; + + suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC); + + if (test_suspend_state(SUSPEND_TRY_RESUME_RD)) + result = rd_init(); + else + result = file_init(); + + if (result) { + printk("Filewriter read header init: Failed to initialise " + "reading the first page of data.\n"); + return result; + } + + memcpy(&suspend_writer_posn_save, + suspend_writer_buffer + suspend_writer_buffer_posn, + sizeof(suspend_writer_posn_save)); + + suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save); + + tmp = devinfo.bdev; + + memcpy(&devinfo, + suspend_writer_buffer + suspend_writer_buffer_posn, + sizeof(devinfo)); + + devinfo.bdev = tmp; + suspend_writer_buffer_posn += sizeof(devinfo); + + suspend_extent_state_goto_start(&suspend_writer_posn); + suspend_bio_ops.set_extra_page_forward(); + + suspend_header_bytes_used = suspend_writer_buffer_posn; + + suspend_load_extent_chain(&block_chain); + + return 0; +} + -- Nigel Cunningham nigel at suspend2 dot net