Commit c6463c65 authored Nov 11, 2016 by Damien Le Moal Committed by Jens Axboe Nov 14, 2016

sd_zbc: Force use of READ16/WRITE16



Normally, sd_read_capacity sets sdp->use_16_for_rw to 1 based on the
disk capacity so that READ16/WRITE16 are used for large drives.
However, for a zoned disk with RC_BASIS set to 0, the capacity reported
through READ_CAPACITY may be very small, leading to use_16_for_rw not being
set and READ10/WRITE10 commands being used, even after the actual zoned disk
capacity is corrected in sd_zbc_read_zones. This causes LBA offset overflow for
accesses beyond 2TB.

As the ZBC standard makes it mandatory for ZBC drives to support
the READ16/WRITE16 commands anyway, make sure that use_16_for_rw is set.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
eviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent dbb3ab03

drivers/scsi/sd_zbc.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -612,6 +612,10 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp,
		if (ret)
		goto err;

		/* READ16/WRITE16 is mandatory for ZBC disks */
		sdkp->device->use_16_for_rw = 1;
		sdkp->device->use_10_for_rw = 0;

		return 0;

		err:

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