[PATCH v16 08/26] dm-linear: Report to the block layer that the write order is preserved

Bart Van Assche
2024-11-19T00:28:46Z

Enable write pipelining if dm-linear is stacked on top of a driver that
supports write pipelining.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/md/dm-linear.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 49fb0f684193..967fbf856abc 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -148,6 +148,11 @@ static int linear_report_zones(struct dm_target *ti,
#define linear_report_zones NULL
#endif

+static void linear_io_hints(struct dm_target *ti, struct queue_limits *limits)
+{
+ limits->driver_preserves_write_order = true;
+}
+
static int linear_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
@@ -209,6 +214,7 @@ static struct target_type linear_target = {
.map = linear_map,
.status = linear_status,
.prepare_ioctl = linear_prepare_ioctl,
+ .io_hints = linear_io_hints,
.iterate_devices = linear_iterate_devices,
.direct_access = linear_dax_direct_access,
.dax_zero_page_range = linear_dax_zero_page_range,