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md: add a new enum type sync_action

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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 <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240611132251.1967786-3-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai
2024-06-11 21:22:41 +08:00
committed by Song Liu
parent 0476d09c36
commit a85aa09da2
1 changed files with 56 additions and 1 deletions
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57
drivers/md/md.h
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@@ -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,
};
/*
* The struct embedded in rdev is used to serialize IO.
*/
@@ -571,7 +626,7 @@ enum recovery_flags {
/* interrupted because io-error */
MD_RECOVERY_ERROR,
/* flags determines sync action */
/* flags determines sync action, see details in enum sync_action */
/* if just this flag is set, action is resync. */
MD_RECOVERY_SYNC,