Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 16/28] [Suspend2] Initialise/cleanup writing the header. | Date | Tue, 27 Jun 2006 08:42:00 +1000 |
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Initialisation and cleanup routines used when writing the image header.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
kernel/power/suspend_swap.c | 89 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 89 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c index efd08ca..b005f8b 100644 --- a/kernel/power/suspend_swap.c +++ b/kernel/power/suspend_swap.c @@ -545,3 +545,92 @@ static int swapwriter_allocate_storage(i return result; } +static int swapwriter_write_header_init(void) +{ + int i, result; + struct swap_info_struct *si; + + suspend_header_bytes_used = 0; + + suspend_extent_state_goto_start(&suspend_writer_posn); + /* Forward one page will be done prior to the read */ + + for (i = 0; i < MAX_SWAPFILES; i++) { + si = get_swap_info_struct(i); + if (si->swap_file) + devinfo[i].dev_t = si->bdev->bd_dev; + else + devinfo[i].dev_t = (dev_t) 0; + } + + suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC); + if (!suspend_writer_buffer) { + printk("Failed to get swapwriter buffer.\n"); + return -ENOMEM; + } + + suspend_writer_buffer_posn = 0; + + /* Info needed to bootstrap goes at the start of the header. + * First we save the positions and devinfo, 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. + */ + + if ((result = suspend_bio_ops.rw_header_chunk(WRITE, + &swapwriterops, + (char *) &suspend_writer_posn_save, + sizeof(suspend_writer_posn_save)))) + return result; + + if ((result = suspend_bio_ops.rw_header_chunk(WRITE, + &swapwriterops, + (char *) &devinfo, sizeof(devinfo)))) + return result; + + for (i=0; i < MAX_SWAPFILES; i++) + suspend_serialise_extent_chain(&swapwriterops, &block_chain[i]); + + return 0; +} + +static int swapwriter_write_header_cleanup(void) +{ + int result; + struct swap_info_struct *si; + + /* 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 swap header */ + suspend_bio_ops.bdev_page_io(READ, resume_block_device, + resume_firstblock, + virt_to_page(suspend_writer_buffer)); + + si = get_swap_info_struct(suspend_writer_posn.current_chain); + result = prepare_signature(si->bdev->bd_dev, + suspend_writer_posn.current_offset, + ((union swap_header *) suspend_writer_buffer)->magic.magic); + + if (!result) + suspend_bio_ops.bdev_page_io(WRITE, resume_block_device, + resume_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 result; +} + -- 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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