Hi,
在 2024/06/11 16:31, Mariusz Tkaczyk 写道:
On Mon, 3 Jun 2024 20:58:05 +0800
Yu Kuai <[email protected]> wrote:
In order to make code related to sync_thread cleaner in following
patches, also add detail comment about each sync action. And also
prepare to remove the related recovery_flags in the fulture.
Signed-off-by: Yu Kuai <[email protected]>
---
drivers/md/md.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 56 insertions(+), 1 deletion(-)
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 170412a65b63..6b9d9246f260 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -34,6 +34,61 @@
*/
#define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT)
+/* Status of sync thread. */
+enum sync_action {
+ /*
+ * Represent by MD_RECOVERY_SYNC, start when:
+ * 1) after assemble, sync data from first rdev to other copies, this
+ * must be done first before other sync actions and will only execute
+ * once;
+ * 2) resize the array(notice that this is not reshape), sync data
for
+ * the new range;
+ */
+ ACTION_RESYNC,
+ /*
+ * Represent by MD_RECOVERY_RECOVER, start when:
+ * 1) for new replacement, sync data based on the replace rdev or
+ * available copies from other rdev;
+ * 2) for new member disk while the array is degraded, sync data from
+ * other rdev;
+ * 3) reassemble after power failure or re-add a hot removed rdev,
sync
+ * data from first rdev to other copies based on bitmap;
+ */
+ ACTION_RECOVER,
+ /*
+ * Represent by MD_RECOVERY_SYNC | MD_RECOVERY_REQUESTED |
+ * MD_RECOVERY_CHECK, start when user echo "check" to sysfs api
+ * sync_action, used to check if data copies from differenct rdev are
+ * the same. The number of mismatch sectors will be exported to user
+ * by sysfs api mismatch_cnt;
+ */
+ ACTION_CHECK,
+ /*
+ * Represent by MD_RECOVERY_SYNC | MD_RECOVERY_REQUESTED, start when
+ * user echo "repair" to sysfs api sync_action, usually paired with
+ * ACTION_CHECK, used to force syncing data once user found that
there
+ * are inconsistent data,
+ */
+ ACTION_REPAIR,
+ /*
+ * Represent by MD_RECOVERY_RESHAPE, start when new member disk is
added
+ * to the conf, notice that this is different from spares or
+ * replacement;
+ */
+ ACTION_RESHAPE,
+ /*
+ * Represent by MD_RECOVERY_FROZEN, can be set by sysfs api
sync_action
+ * or internal usage like setting the array read-only, will forbid
above
+ * actions.
+ */
+ ACTION_FROZEN,
+ /*
+ * All above actions don't match.
+ */
+ ACTION_IDLE,
+ NR_SYNC_ACTIONS,
+};
I like if counter is keep in same style as rest enum values, like ACTION_COUNT.
Thanks for the review, however, I didn't find this style "xxx_COUNT" in
md code, AFAIK, "NR_xxx" style is used more, for example:
enum stat_group {
STAT_READ,
STAT_WRITE,
STAT_DISCARD,
STAT_FLUSH,
NR_STAT_GROUPS
};
Just to let you know, I'll keep this style in the next version. :)
Thanks,
Kuai
Anyway LGTM.
Mariusz
.
