This patch adds a new configfs parameter to enable REQ_OP_WRITE_ZEROES feature for null_blk similar to REQ_OP_DISCARD when device is memory backed.
Signed-off-by: Chaitanya Kulkarni <[email protected]> --- drivers/block/null_blk_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c index 30cb90553167..c734ddaa697f 100644 --- a/drivers/block/null_blk_main.c +++ b/drivers/block/null_blk_main.c @@ -308,6 +308,7 @@ NULLB_DEVICE_ATTR(blocking, bool); NULLB_DEVICE_ATTR(use_per_node_hctx, bool); NULLB_DEVICE_ATTR(memory_backed, bool); NULLB_DEVICE_ATTR(discard, bool); +NULLB_DEVICE_ATTR(write_zeroes, bool); NULLB_DEVICE_ATTR(mbps, uint); NULLB_DEVICE_ATTR(cache_size, ulong); NULLB_DEVICE_ATTR(zoned, bool); @@ -423,6 +424,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_power, &nullb_device_attr_memory_backed, &nullb_device_attr_discard, + &nullb_device_attr_write_zeroes, &nullb_device_attr_mbps, &nullb_device_attr_cache_size, &nullb_device_attr_badblocks, @@ -481,7 +483,7 @@ nullb_group_drop_item(struct config_group *group, struct config_item *item) static ssize_t memb_group_features_show(struct config_item *item, char *page) { - return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size\n"); + return snprintf(page, PAGE_SIZE, "memory_backed,discard,write_zeroes,bandwidth,cache,badblocks,zoned,zone_size\n"); } CONFIGFS_ATTR_RO(memb_group_, features); -- 2.17.0
