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Subject[PATCH 5.15 116/179] scsi: scsi_debug: Zero clear zones at reset write pointer
Date
From: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>

[ Upstream commit 2d62253eb1b60f4ce8b39125eee282739b519297 ]

When a reset is requested the position of the write pointer is updated but
the data in the corresponding zone is not cleared. Instead scsi_debug
returns any data written before the write pointer was reset. This is an
error and prevents using scsi_debug for stale page cache testing of the
BLKRESETZONE ioctl.

Zero written data in the zone when resetting the write pointer.

Link: https://lore.kernel.org/r/20211122061223.298890-1-shinichiro.kawasaki@wdc.com
Fixes: f0d1cf9378bd ("scsi: scsi_debug: Add ZBC zone commands")
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/scsi_debug.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index ead65cdfb522e..1b1a63a467816 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -4649,6 +4649,7 @@ static void zbc_rwp_zone(struct sdebug_dev_info *devip,
struct sdeb_zone_state *zsp)
{
enum sdebug_z_cond zc;
+ struct sdeb_store_info *sip = devip2sip(devip, false);

if (zbc_zone_is_conv(zsp))
return;
@@ -4660,6 +4661,10 @@ static void zbc_rwp_zone(struct sdebug_dev_info *devip,
if (zsp->z_cond == ZC4_CLOSED)
devip->nr_closed--;

+ if (zsp->z_wp > zsp->z_start)
+ memset(sip->storep + zsp->z_start * sdebug_sector_size, 0,
+ (zsp->z_wp - zsp->z_start) * sdebug_sector_size);
+
zsp->z_non_seq_resource = false;
zsp->z_wp = zsp->z_start;
zsp->z_cond = ZC1_EMPTY;
--
2.33.0


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