From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933253AbWFZXBB (ORCPT ); Mon, 26 Jun 2006 19:01:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933280AbWFZXAY (ORCPT ); Mon, 26 Jun 2006 19:00:24 -0400 Received: from cust9421.vic01.dataco.com.au ([203.171.70.205]:25783 "EHLO nigel.suspend2.net") by vger.kernel.org with ESMTP id S933253AbWFZWj7 (ORCPT ); Mon, 26 Jun 2006 18:39:59 -0400 From: Nigel Cunningham Subject: [Suspend2][ 16/35] [Suspend2] Filewriter header writing init/cleanup. Date: Tue, 27 Jun 2006 08:39:57 +1000 To: linux-kernel@vger.kernel.org Message-Id: <20060626223956.4685.8862.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 Initialisation and cleanup routines for writing the image header. Signed-off-by: Nigel Cunningham kernel/power/suspend_file.c | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 64 insertions(+), 0 deletions(-) diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c index cdc0261..46527f1 100644 --- a/kernel/power/suspend_file.c +++ b/kernel/power/suspend_file.c @@ -480,3 +480,67 @@ static int filewriter_allocate_storage(i return result; } +static int filewriter_write_header_init(void) +{ + suspend_extent_state_goto_start(&suspend_writer_posn); + + suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC); + suspend_writer_buffer_posn = suspend_header_bytes_used = 0; + + /* Info needed to bootstrap goes at the start of the header. + * First we save the basic info needed for reading, including the number + * of header pages. Then we save the structs containing data needed + * for reading the header pages back. + * Note that even if header pages take more than one page, when we + * read back the info, we will have restored the location of the + * next header page by the time we go to use it. + */ + + suspend_bio_ops.rw_header_chunk(WRITE, &filewriterops, + (char *) &suspend_writer_posn_save, + sizeof(suspend_writer_posn_save)); + + suspend_bio_ops.rw_header_chunk(WRITE, &filewriterops, + (char *) &devinfo, sizeof(devinfo)); + + suspend_serialise_extent_chain(&filewriterops, &block_chain); + + return 0; +} + +static int filewriter_write_header_cleanup(void) +{ + struct filewriter_header *header; + + /* Write any unsaved data */ + if (suspend_writer_buffer_posn) + suspend_bio_ops.write_header_chunk_finish(); + + suspend_bio_ops.finish_all_io(); + + suspend_extent_state_goto_start(&suspend_writer_posn); + suspend_bio_ops.forward_one_page(); + + /* Adjust image header */ + suspend_bio_ops.bdev_page_io(READ, filewriter_target_bdev, + target_firstblock, + virt_to_page(suspend_writer_buffer)); + + header = (struct filewriter_header *) suspend_writer_buffer; + + prepare_signature(header, + suspend_writer_posn.current_offset << + devinfo.bmap_shift); + + suspend_bio_ops.bdev_page_io(WRITE, filewriter_target_bdev, + target_firstblock, + virt_to_page(suspend_writer_buffer)); + + free_page((unsigned long) suspend_writer_buffer); + suspend_writer_buffer = NULL; + + suspend_bio_ops.finish_all_io(); + + return 0; +} + -- Nigel Cunningham nigel at suspend2 dot net