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md: suspend array when sync_action=reshape

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raid10 needs to resize/swap r10bio_pool when reshape changes
raid_disks, and, don't let new requests keep allocating r10bio
objects from the old pool while that transition is in progress.

suspend and lock array before mddev_start_reshape(), and resume
it on exit.

Other sync_action ops are unchanged.

Signed-off-by: Chen Cheng <chencheng@fnnas.com>
Link: https://patch.msgid.link/20260711100352.425177-2-chencheng@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Chen Cheng
2026-07-11 18:03:50 +08:00
committed by Yu Kuai
parent 6bc3deb600
commit 798d79a7e4
1 changed files with 12 additions and 3 deletions
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15
drivers/md/md.c
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@@ -5263,21 +5263,28 @@ action_store(struct mddev *mddev, const char *page, size_t len)
if (!mddev->pers || !mddev->pers->sync_request)
return -EINVAL;
action = md_sync_action_by_name(page);
if (action == ACTION_RESHAPE) {
ret = mddev_suspend(mddev, true);
if (ret)
return ret;
}
retry:
if (work_busy(&mddev->sync_work))
flush_work(&mddev->sync_work);
ret = mddev_lock(mddev);
if (ret)
if (ret) {
if (action == ACTION_RESHAPE)
mddev_resume(mddev);
return ret;
}
if (work_busy(&mddev->sync_work)) {
mddev_unlock(mddev);
goto retry;
}
action = md_sync_action_by_name(page);
/* TODO: mdadm rely on "idle" to start sync_thread. */
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
switch (action) {
@@ -5347,6 +5354,8 @@ action_store(struct mddev *mddev, const char *page, size_t len)
out:
mddev_unlock(mddev);
if (action == ACTION_RESHAPE)
mddev_resume(mddev);
return ret;
}