Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 16/35] [Suspend2] Filewriter header writing init/cleanup. | Date | Tue, 27 Jun 2006 08:39:57 +1000 |
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Initialisation and cleanup routines for writing the image header.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
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 - 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/
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