Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 19/20] [Suspend2] Prepare an image. | Date | Tue, 27 Jun 2006 08:35:51 +1000 |
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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 - 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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