[md PATCH 3/3] md: export 'frozen' resync state through sysfs
DORMANTno replies
From: NeilBrown <hidden>
Date: 2009-05-25 04:33:52
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
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: NeilBrown <redacted> --- drivers/md/md.c | 11 +++++++++-- 1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index cc46c11..6683b9a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c@@ -3303,7 +3303,9 @@ 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";
@@ -3326,7 +3328,12 @@ 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);