5.10-stable review patch. If anyone has any objections, please let me know.
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From: Shin'ichiro Kawasaki shinichiro.kawasaki@wdc.com
commit 288b3271d920c9ba949c3bab0f749f4cecc70e09 upstream.
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@wdc.com Link: https://lore.kernel.org/r/20230306063024.3376959-1-shinichiro.kawasaki@wdc.c... Reviewed-by: Damien Le Moal damien.lemoal@opensource.wdc.com Reviewed-by: Johannes Thumshirn johannes.thumshirn@wdc.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/sd.c | 7 ++++++- drivers/scsi/sd_zbc.c | 8 -------- 2 files changed, 6 insertions(+), 9 deletions(-)
--- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3026,8 +3026,13 @@ static void sd_read_block_characteristic }
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. + */ blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HM); + blk_queue_zone_write_granularity(q, sdkp->physical_block_size); } else { sdkp->zoned = (buffer[8] >> 4) & 3; if (sdkp->zoned == 1) { --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -793,14 +793,6 @@ int sd_zbc_read_zones(struct scsi_disk * blk_queue_max_active_zones(q, 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); - /* READ16/WRITE16 is mandatory for ZBC disks */ sdkp->device->use_16_for_rw = 1; sdkp->device->use_10_for_rw = 0;