Since using scsi_req() is only allowed against request queues for which
struct scsi_request is the first member of their private request
data, refuse to register block layer queues for which the private
data is smaller than struct scsi_request.
References: commit 82ed4db499b8 ("block: split scsi_request out of struct request")
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Omar Sandoval <osandov@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: linux-nfs@xxxxxxxxxxxxxxx
Cc: linux-block@xxxxxxxxxxxxxxx
---
fs/nfsd/blocklayout.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index fb5213afc854..90d1df31491b 100644
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -219,6 +219,9 @@ static int nfsd4_scsi_identify_device(struct block_device *bdev,
u8 *buf, *d, type, assoc;
int error;
+ if (WARN_ON_ONCE(blk_queue_cmd_size(q) < sizeof(struct scsi_request)))
+ return -EINVAL;
+
buf = kzalloc(bufflen, GFP_KERNEL);
if (!buf)
return -ENOMEM;
--
2.12.2
