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 <[email protected]>
Cc: J. Bruce Fields <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Omar Sandoval <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
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
