Reporting a maximum number of blocks that is not aligned on the device
physical size would cause a large write same request to be split into
physically unaligned chunks by __blkdev_issue_write_zeroes() and
__blkdev_issue_write_same(), even if the caller of these functions took
care to align its request to physical sectors.
So make sure the maximum reported is aligned to the device physical
block size. This is only an optional optimization for regular disks,
but this is mandatory to avoid failure of large write same requests
directed at sequential write required zones of host-managed ZBC disks.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
drivers/scsi/sd.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e2647f2d4430..0a824e9f4d63 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -898,6 +898,26 @@ static void sd_config_write_same(struct scsi_disk *sdkp)
else
sdkp->zeroing_mode = SD_ZERO_WRITE;
+ if (sdkp->max_ws_blocks &&
+ sdkp->physical_block_size > logical_block_size) {
+ /*
+ * Reporting a maximum number of blocks that is not aligned
+ * on the device physical size would cause a large write same
+ * request to be split into physically unaligned chunks by
+ * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
+ * even if the caller of these functions took care to align the
+ * large request. So make sure the maximum reported is aligned
+ * to the device physical block size. This is only an optional
+ * optimization for regular disks, but this is mandatory to
+ * avoid failure of large write same requests directed at
+ * sequential write required zones of host-managed ZBC disks.
+ */
+ sdkp->max_ws_blocks =
+ round_down(sdkp->max_ws_blocks,
+ bytes_to_logical(sdkp->device,
+ sdkp->physical_block_size));
+ }
+
out:
blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
(logical_block_size >> 9));
--
2.13.5
