[RFC PATCH v2 4/8] dm: add BLK_FEAT_WRITE_ZEROES_UNMAP support

Zhang Yi
2025-01-15T11:53:32Z

From: Zhang Yi <yi.zhang@huawei.com>

Set the BLK_FEAT_WRITE_ZEROES_UNMAP feature on stacking queue limits by
default. This feature shall be disabled if any underlying device does
not support it.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
drivers/md/dm-table.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index bd8b796ae683..58cce31bcc1e 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -598,7 +598,8 @@ int dm_split_args(int *argc, char ***argvp, char *input)
static void dm_set_stacking_limits(struct queue_limits *limits)
{
blk_set_stacking_limits(limits);
- limits->features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT | BLK_FEAT_POLL;
+ limits->features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT | BLK_FEAT_POLL |
+ BLK_FEAT_WRITE_ZEROES_UNMAP;
}

/*
--
2.39.2