[PATCH v2] sd: Write lock zone for REQ_OP_WRITE_ZEROES

[damien . lemoal]

From: Damien Le Moal <damien.lem...@wdc.com>

For a zoned block device, sd_zbc_complete() handles zone write unlock
on completion of a REQ_OP_WRITE_ZEROES command but the zone write
locking is missing from sd_setup_write_zeroes_cmnd(). This patch fixes
this problem by locking the target zone of a REQ_OP_WRITE_ZEROES
request.

Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
---

Changes from v1:
* Lock zone in all cases so that no warning is triggered in sd_zbc_complete()
  with unlocked zones for the unmap case.

 drivers/scsi/sd.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e60a309..de9e2f2 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -827,21 +827,32 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd 
*cmd)
        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
        u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
        u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
+       int ret;
 
        if (!(rq->cmd_flags & REQ_NOUNMAP)) {
                switch (sdkp->zeroing_mode) {
                case SD_ZERO_WS16_UNMAP:
-                       return sd_setup_write_same16_cmnd(cmd, true);
+                       ret = sd_setup_write_same16_cmnd(cmd, true);
+                       goto out;
                case SD_ZERO_WS10_UNMAP:
-                       return sd_setup_write_same10_cmnd(cmd, true);
+                       ret = sd_setup_write_same10_cmnd(cmd, true);
+                       goto out;
                }
        }
 
        if (sdp->no_write_same)
                return BLKPREP_INVALID;
+
        if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
-               return sd_setup_write_same16_cmnd(cmd, false);
-       return sd_setup_write_same10_cmnd(cmd, false);
+               ret = sd_setup_write_same16_cmnd(cmd, false);
+       else
+               ret = sd_setup_write_same10_cmnd(cmd, false);
+
+out:
+       if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
+               return sd_zbc_write_lock_zone(cmd);
+
+       return ret;
 }
 
 static void sd_config_write_same(struct scsi_disk *sdkp)
-- 
2.9.3