Hi Hannes,
On 7/19/16 22:25, Hannes Reinecke wrote:
We can map the RESET WRITE POINTER command onto a 'discard'
request.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/sd.c | 65 ++++++++++++++++++++++++++++++++++++++++++++-----------
drivers/scsi/sd.h | 1 +
2 files changed, 53 insertions(+), 13 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 249ea81..52dda83 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -369,6 +369,7 @@ static const char *lbp_mode[] = {
[SD_LBP_WS16] = "writesame_16",
[SD_LBP_WS10] = "writesame_10",
[SD_LBP_ZERO] = "writesame_zero",
+ [SD_ZBC_RESET_WP] = "reset_wp",
[SD_LBP_DISABLE] = "disabled",
};
@@ -391,6 +392,13 @@ provisioning_mode_store(struct device *dev, struct device_attribute *attr,
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
+ if (sdkp->zoned == 1) {
+ if (!strncmp(buf, lbp_mode[SD_ZBC_RESET_WP], 20)) {
+ sd_config_discard(sdkp, SD_ZBC_RESET_WP);
+ return count;
+ }
+ return -EINVAL;
+ }
if (sdp->type != TYPE_DISK)
return -EINVAL;
@@ -683,6 +691,11 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
q->limits.discard_zeroes_data = sdkp->lbprz;
break;
+ case SD_ZBC_RESET_WP:
+ max_blocks = sdkp->unmap_granularity;
+ q->limits.discard_zeroes_data = 1;
+ break;
+
case SD_LBP_ZERO:
max_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS10_BLOCKS);
I am still wondering if setting discard_zeroes_data to 1 is the right
choice here since nothing will happen for conventional zones (no
zeroing, no reset, nothing). discard_zeroes_data=0 may be a safer
choice, even though I have not hit any issue with it set to 1.
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
Tested-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
--
Damien Le Moal, Ph.D.
Sr. Manager, System Software Group, HGST Research,
HGST, a Western Digital brand
Damien.LeMoal@xxxxxxxx
(+81) 0466-98-3593 (ext. 513593)
1 kirihara-cho, Fujisawa,
Kanagawa, 252-0888 Japan
www.hgst.com
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