From: Hou Tao houtao1@huawei.com
commit 1d1f25bfda432a6b61bd0205d426226bbbd73504 upstream.
Don't update recovery_cp when curr_resync is MD_RESYNC_ACTIVE, otherwise md may skip the resync of the first 3 sectors if the resync procedure is interrupted before the first calling of ->sync_request() as shown below:
md_do_sync thread control thread // setup resync mddev->recovery_cp = 0 j = 0 mddev->curr_resync = MD_RESYNC_ACTIVE
// e.g., set array as idle set_bit(MD_RECOVERY_INTR, &&mddev_recovery) // resync loop // check INTR before calling sync_request !test_bit(MD_RECOVERY_INTR, &mddev->recovery
// resync interrupted // update recovery_cp from 0 to 3 // the resync of three 3 sectors will be skipped mddev->recovery_cp = 3
Fixes: eac58d08d493 ("md: Use enum for overloaded magic numbers used by mddev->curr_resync") Cc: stable@vger.kernel.org # 6.0+ Signed-off-by: Hou Tao houtao1@huawei.com Reviewed-by: Logan Gunthorpe logang@deltatee.com Signed-off-by: Song Liu song@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/md.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -9039,7 +9039,7 @@ void md_do_sync(struct md_thread *thread mddev->pers->sync_request(mddev, max_sectors, &skipped);
if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && - mddev->curr_resync >= MD_RESYNC_ACTIVE) { + mddev->curr_resync > MD_RESYNC_ACTIVE) { if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { if (mddev->curr_resync >= mddev->recovery_cp) {