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    Subject[Suspend2][ 08/19] [Suspend2] I/O main loop.
    Date
    Main I/O loop in the core of Suspend2. Submits pages for I/O to the first
    plugin in the pipeline and sends status updates to any userui component.

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

    kernel/power/io.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 65 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/io.c b/kernel/power/io.c
    index be13f42..f237231 100644
    --- a/kernel/power/io.c
    +++ b/kernel/power/io.c
    @@ -241,3 +241,68 @@ static int rw_cleanup_modules(int rw)
    return result;
    }

    +/*
    + * do_rw_loop
    + *
    + * The main I/O loop for reading or writing pages.
    + */
    +static int do_rw_loop(int write, int finish_at, dyn_pageflags_t *pageflags,
    + int base, int barmax)
    +{
    + int current_page_index = -1, pc, step = 1, nextupdate = 0, i;
    + int result;
    + struct suspend_module_ops *first_filter = suspend_get_next_filter(NULL);
    +
    + current_page_index = get_next_bit_on(*pageflags, -1);
    +
    + pc = finish_at / 5;
    +
    + /* Read the pages */
    + for (i=0; i< finish_at; i++) {
    + struct page *page = pfn_to_page(current_page_index);
    +
    + /* Status */
    + if ((i+base) >= nextupdate)
    + nextupdate = suspend_update_status(i+base, barmax,
    + " %d/%d MB ", MB(base+i+1), MB(barmax));
    +
    + if ((i + 1) == pc) {
    + printk("%d%%...", 20 * step);
    + step++;
    + pc = finish_at * step / 5;
    + }
    +
    + if (write)
    + result = first_filter->write_chunk(page);
    + else
    + result = first_filter->read_chunk(page, SUSPEND_ASYNC);
    +
    + if (result) {
    + if (write) {
    + printk("Write chunk returned %d.\n", result);
    + abort_suspend("Failed to write a chunk of the "
    + "image.");
    + return result;
    + } else
    + panic("Failed to read chunk %d/%d of the image. (%d)",
    + i, finish_at, result);
    + }
    +
    + /* Interactivity*/
    + suspend_cond_pause(0, NULL);
    +
    + if (test_result_state(SUSPEND_ABORTED) && write)
    + return 1;
    +
    + /* Prepare next */
    + current_page_index = get_next_bit_on(*pageflags,
    + current_page_index);
    + }
    +
    + printk("done.\n");
    +
    + suspend_update_status(base + finish_at, barmax, " %d/%d MB ",
    + MB(base + finish_at), MB(barmax));
    + return 0;
    +}
    +
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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