[PATCH 5.10 717/717] null_blk: Fail zone append to conventional zones

[Greg Kroah-Hartman]

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

commit 2e896d89510f23927ec393bee1e0570db3d5a6c6 upstream.

Conventional zones do not have a write pointer and so cannot accept zone
append writes. Make sure to fail any zone append write command issued to
a conventional zone.

Reported-by: Naohiro Aota <naohiro.a...@wdc.com>
Fixes: e0489ed5daeb ("null_blk: Support REQ_OP_ZONE_APPEND")
Cc: sta...@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumsh...@wdc.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/block/null_blk_zoned.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -339,8 +339,11 @@ static blk_status_t null_zone_write(stru
 
        trace_nullb_zone_op(cmd, zno, zone->cond);
 
-       if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
+       if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {
+               if (append)
+                       return BLK_STS_IOERR;
                return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
+       }
 
        null_lock_zone(dev, zno);