From: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
[ Upstream commit 288b3271d920c9ba949c3bab0f749f4cecc70e09 ]
When the sd driver revalidates host-managed SMR disks, it calls
disk_set_zoned() which changes the zone_write_granularity attribute value
to the logical block size regardless of the device type. After that, the sd
driver overwrites the value in sd_zbc_read_zone() with the physical block
size, since ZBC/ZAC requires this for host-managed disks. Between the calls
to disk_set_zoned() and sd_zbc_read_zone(), there exists a window where the
attribute shows the logical block size as the zone_write_granularity value,
which is wrong for host-managed disks. The duration of the window is from
20ms to 200ms, depending on report zone command execution time.
To avoid the wrong zone_write_granularity value between disk_set_zoned()
and sd_zbc_read_zone(), modify the value not in sd_zbc_read_zone() but
just after disk_set_zoned() call.
Fixes: a805a4fa4fa3 ("block: introduce zone_write_granularity limit")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Link: https://lore.kernel.org/r/20230306063024.3376959-1-shinichiro.kawasaki@xxxxxxx
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/sd.c | 7 ++++++-
drivers/scsi/sd_zbc.c | 8 --------
2 files changed, 6 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 47dafe6b8a66d..797d02a6613a6 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2974,8 +2974,13 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp)
}
if (sdkp->device->type == TYPE_ZBC) {
- /* Host-managed */
+ /*
+ * Host-managed: Per ZBC and ZAC specifications, writes in
+ * sequential write required zones of host-managed devices must
+ * be aligned to the device physical block size.
+ */
disk_set_zoned(sdkp->disk, BLK_ZONED_HM);
+ blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
} else {
sdkp->zoned = zoned;
if (sdkp->zoned == 1) {
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 62abebbaf2e7e..d33da6e1910f8 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -963,14 +963,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
disk_set_max_active_zones(disk, 0);
nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
- /*
- * Per ZBC and ZAC specifications, writes in sequential write required
- * zones of host-managed devices must be aligned to the device physical
- * block size.
- */
- if (blk_queue_zoned_model(q) == BLK_ZONED_HM)
- blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
-
sdkp->early_zone_info.nr_zones = nr_zones;
sdkp->early_zone_info.zone_blocks = zone_blocks;
--
2.39.2
