Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 19/35] [Suspend2] Filewriter header reading initialisation. | Date | Tue, 27 Jun 2006 08:40:07 +1000 |
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Shared initialisation when reading a filewriter image header.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
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 - 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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