Commit b6a9ce68 authored by NeilBrown's avatar NeilBrown
Browse files

md: export 'frozen' resync state through sysfs 



The md resync engine has a 'frozen' state which ensures that
no resync/recovery.  This is used to avoid races.

Export this state through the 'sync_action' sysfs attribute
so that user-space can benefit and also avoid some races.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent be512691

drivers/md/md.c

+9 −2
Original line number Diff line number Diff line
@@ -3306,7 +3306,9 @@ static ssize_t 
action_show(mddev_t *mddev, char *page)

{

	char *type = "idle";

	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||

	if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))

		type = "frozen";

	else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||

	    (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {

		if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))

			type = "reshape";
@@ -3329,7 +3331,12 @@ action_store(mddev_t *mddev, const char *page, size_t len) 
	if (!mddev->pers || !mddev->pers->sync_request)

		return -EINVAL;



	if (cmd_match(page, "idle")) {

	if (cmd_match(page, "frozen"))

		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);

	else

		clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);



	if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {

		if (mddev->sync_thread) {

			set_bit(MD_RECOVERY_INTR, &mddev->recovery);

			md_unregister_thread(mddev->sync_thread);

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