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md: fix sync_action incorrect display during resync 

During raid resync, if a disk becomes faulty, the operation is
briefly interrupted. The MD_RECOVERY_RECOVER flag triggered by
the disk failure causes sync_action to incorrectly show "recover"
instead of "resync". The same issue affects reshape operations.

Reproduction steps:
  mdadm -Cv /dev/md1 -l1 -n4 -e1.2 /dev/sd{a..d} // -> resync happened
  mdadm -f /dev/md1 /dev/sda                     // -> resync interrupted
  cat sync_action
  -> recover

Add progress checks in md_sync_action() for resync/recover/reshape
to ensure the interface correctly reports the actual operation type.

Fixes: 4b10a3bc67 ("md: ensure resync is prioritized over recovery")
Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
Link: https://lore.kernel.org/linux-raid/20250816002534.1754356-3-zhengqixing@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
pull/1322/head
Zheng Qixing 2025-08-16 08:25:34 +08:00 committed by Yu Kuai
parent cb0780ad43
commit b7ee30f0ef
1 changed files with 35 additions and 2 deletions
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37
drivers/md/md.c
View File

@ -4848,9 +4848,33 @@ static bool rdev_needs_recovery(struct md_rdev *rdev, sector_t sectors)
rdev->recovery_offset < sectors;
}
static enum sync_action md_get_active_sync_action(struct mddev *mddev)
{
struct md_rdev *rdev;
bool is_recover = false;
if (mddev->resync_offset < MaxSector)
return ACTION_RESYNC;
if (mddev->reshape_position != MaxSector)
return ACTION_RESHAPE;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
if (rdev_needs_recovery(rdev, MaxSector)) {
is_recover = true;
break;
}
}
rcu_read_unlock();
return is_recover ? ACTION_RECOVER : ACTION_IDLE;
}
enum sync_action md_sync_action(struct mddev *mddev)
{
unsigned long recovery = mddev->recovery;
enum sync_action active_action;
/*
* frozen has the highest priority, means running sync_thread will be
@ -4874,8 +4898,17 @@ enum sync_action md_sync_action(struct mddev *mddev)
!test_bit(MD_RECOVERY_NEEDED, &recovery))
return ACTION_IDLE;
if (test_bit(MD_RECOVERY_RESHAPE, &recovery) ||
mddev->reshape_position != MaxSector)
/*
* Check if any sync operation (resync/recover/reshape) is
* currently active. This ensures that only one sync operation
* can run at a time. Returns the type of active operation, or
* ACTION_IDLE if none are active.
*/
active_action = md_get_active_sync_action(mddev);
if (active_action != ACTION_IDLE)
return active_action;
if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
return ACTION_RESHAPE;
if (test_bit(MD_RECOVERY_RECOVER, &recovery))