在 2025/09/04 0:10, John Garry 写道:
All the infrastructure has already been plumbed to support this for stacked devices, so just enable the request_queue limits features flag. A note about chunk sectors for linear arrays: While it is possible to set a chunk sectors param for building a linear array, this is for specifying the granularity at which data sectors from the device are used. It is not the same as a stripe size, like for RAID0. As such, it is not appropriate to set chunk_sectors request queue limit to the same value, as chunk_sectors request limit is a boundary for which requests cannot straddle. However, request_queue limit max_hw_sectors is set to chunk sectors, which almost has the same effect as setting chunk_sectors limit. Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx> diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c index 5d9b081153757..30ac29b990c9b 100644 --- a/drivers/md/md-linear.c +++ b/drivers/md/md-linear.c @@ -74,6 +74,7 @@ static int linear_set_limits(struct mddev *mddev) lim.max_hw_sectors = mddev->chunk_sectors; lim.max_write_zeroes_sectors = mddev->chunk_sectors; lim.io_min = mddev->chunk_sectors << 9; + lim.features |= BLK_FEAT_ATOMIC_WRITES; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err;
LGRM Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
