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    Subject[Suspend2][ 19/20] [Suspend2] Prepare an image.
    Date
    Attempt to prepare everything for suspending. This section of the code does
    most of the work - freezing processes, allocating storage, freeing memory
    and so on. Once it is complete, we are either going to abort or jump
    straight into writing the image.

    Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

    kernel/power/prepare_image.c | 63 ++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 63 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/prepare_image.c b/kernel/power/prepare_image.c
    index 893ba72..10159e5 100644
    --- a/kernel/power/prepare_image.c
    +++ b/kernel/power/prepare_image.c
    @@ -622,3 +622,66 @@ static int eat_memory(void)
    return 0;
    }

    +/* prepare_image
    + *
    + * Entry point to the whole image preparation section.
    + *
    + * We do four things:
    + * - Freeze processes;
    + * - Ensure image size constraints are met;
    + * - Complete all the preparation for saving the image,
    + * including allocation of storage. The only memory
    + * that should be needed when we're finished is that
    + * for actually storing the image (and we know how
    + * much is needed for that because the modules tell
    + * us).
    + * - Make sure that all dirty buffers are written out.
    + */
    +#define MAX_TRIES 4
    +int suspend_prepare_image(void)
    +{
    + int result = 1, tries = 0;
    +
    + are_frozen = 0;
    +
    + header_space_allocated = 0;
    +
    + if (attempt_to_freeze())
    + return 1;
    +
    + if (!extra_pd1_pages_allowance)
    + get_extra_pd1_allowance();
    +
    + storage_available = suspend_active_writer->storage_available();
    +
    + if (!storage_available) {
    + printk(KERN_ERR "You need some storage available to be able to suspend.\n");
    + set_result_state(SUSPEND_ABORTED);
    + set_result_state(SUSPEND_NOSTORAGE_AVAILABLE);
    + return 1;
    + }
    +
    + do {
    + suspend_prepare_status(CLEAR_BAR, "Preparing Image.");
    +
    + if (eat_memory() || test_result_state(SUSPEND_ABORTED))
    + break;
    +
    + result = update_image();
    +
    + suspend_cond_pause(0, NULL);
    +
    + tries++;
    +
    + } while ((result) && (tries < MAX_TRIES) && (!test_result_state(SUSPEND_ABORTED)) &&
    + (!test_result_state(SUSPEND_UNABLE_TO_FREE_ENOUGH_MEMORY)));
    +
    + if (tries == MAX_TRIES) {
    + abort_suspend("Unable to successfully prepare the image.\n");
    + display_stats(1, 0);
    + }
    +
    + suspend_cond_pause(1, "Image preparation complete.");
    +
    + return result;
    +}
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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