[RFC PATCH -next v3 05/10] scsi: sd: set BLK_FEAT_WRITE_ZEROES_UNMAP if device supports unmap zeroing mode

Zhang Yi
2025-03-18T07:44:15Z

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

When the device supports the Write Zeroes command and the zeroing mode
is set to SD_ZERO_WS16_UNMAP or SD_ZERO_WS10_UNMAP, this means that the
device supports unmap Write Zeroes, so set the corresponding
BLK_FEAT_WRITE_ZEROES_UNMAP feature to the device's queue limit.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
drivers/scsi/sd.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 950d8c9fb884..652630b410de 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1118,6 +1118,11 @@ static void sd_config_write_same(struct scsi_disk *sdkp,
else
sdkp->zeroing_mode = SD_ZERO_WRITE;

+ if (sdkp->max_ws_blocks &&
+ (sdkp->zeroing_mode == SD_ZERO_WS16_UNMAP ||
+ sdkp->zeroing_mode == SD_ZERO_WS10_UNMAP))
+ lim->features |= BLK_FEAT_WRITE_ZEROES_UNMAP;
+
if (sdkp->max_ws_blocks &&
sdkp->physical_block_size > logical_block_size) {
/*
--
2.46.1