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 <[email protected]>
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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