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scsi: sd: Fix wrong zone_write_granularity value during revalidate

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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: a805a4fa4f ("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.com
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>
This commit is contained in:
Shin'ichiro Kawasaki 2023-03-06 15:30:24 +09:00 • committed by Martin K. Petersen
parent 11d9874c42
commit 288b3271d9
2 changed files with 6 additions and 9 deletions
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7
drivers/scsi/sd.c
View file

@ -2988,8 +2988,13 @@ 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) {

8
drivers/scsi/sd_zbc.c
View file

@ -965,14 +965,6 @@ 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;