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authorChristoph Hellwig <hch@lst.de>2017-01-27 09:46:29 +0100
committerJens Axboe <axboe@fb.com>2017-01-27 15:08:35 -0700
commit82ed4db499b8598f16f8871261bff088d6b0597f (patch)
treee1cc0a433bf5ae2b9723837291617bdfeeb61816 /block/bsg-lib.c
parent8ae94eb65be9425af4d57a4f4cfebfdf03081e93 (diff)
downloadlinux-0-day-82ed4db499b8598f16f8871261bff088d6b0597f.tar.gz
block: split scsi_request out of struct request
And require all drivers that want to support BLOCK_PC to allocate it as the first thing of their private data. To support this the legacy IDE and BSG code is switched to set cmd_size on their queues to let the block layer allocate the additional space. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/bsg-lib.c')
-rw-r--r--block/bsg-lib.c34
1 files changed, 23 insertions, 11 deletions
diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index c74acf4..cd15f9d 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -71,22 +71,24 @@ void bsg_job_done(struct bsg_job *job, int result,
{
struct request *req = job->req;
struct request *rsp = req->next_rq;
+ struct scsi_request *rq = scsi_req(req);
int err;
err = job->req->errors = result;
if (err < 0)
/* we're only returning the result field in the reply */
- job->req->sense_len = sizeof(u32);
+ rq->sense_len = sizeof(u32);
else
- job->req->sense_len = job->reply_len;
+ rq->sense_len = job->reply_len;
/* we assume all request payload was transferred, residual == 0 */
- req->resid_len = 0;
+ rq->resid_len = 0;
if (rsp) {
- WARN_ON(reply_payload_rcv_len > rsp->resid_len);
+ WARN_ON(reply_payload_rcv_len > scsi_req(rsp)->resid_len);
/* set reply (bidi) residual */
- rsp->resid_len -= min(reply_payload_rcv_len, rsp->resid_len);
+ scsi_req(rsp)->resid_len -=
+ min(reply_payload_rcv_len, scsi_req(rsp)->resid_len);
}
blk_complete_request(req);
}
@@ -113,6 +115,7 @@ static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)
if (!buf->sg_list)
return -ENOMEM;
sg_init_table(buf->sg_list, req->nr_phys_segments);
+ scsi_req(req)->resid_len = blk_rq_bytes(req);
buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
buf->payload_len = blk_rq_bytes(req);
return 0;
@@ -127,6 +130,7 @@ static int bsg_create_job(struct device *dev, struct request *req)
{
struct request *rsp = req->next_rq;
struct request_queue *q = req->q;
+ struct scsi_request *rq = scsi_req(req);
struct bsg_job *job;
int ret;
@@ -140,9 +144,9 @@ static int bsg_create_job(struct device *dev, struct request *req)
job->req = req;
if (q->bsg_job_size)
job->dd_data = (void *)&job[1];
- job->request = req->cmd;
- job->request_len = req->cmd_len;
- job->reply = req->sense;
+ job->request = rq->cmd;
+ job->request_len = rq->cmd_len;
+ job->reply = rq->sense;
job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
* allocated */
if (req->bio) {
@@ -228,9 +232,15 @@ struct request_queue *bsg_setup_queue(struct device *dev, char *name,
struct request_queue *q;
int ret;
- q = blk_init_queue(bsg_request_fn, NULL);
+ q = blk_alloc_queue(GFP_KERNEL);
if (!q)
return ERR_PTR(-ENOMEM);
+ q->cmd_size = sizeof(struct scsi_request);
+ q->request_fn = bsg_request_fn;
+
+ ret = blk_init_allocated_queue(q);
+ if (ret)
+ goto out_cleanup_queue;
q->queuedata = dev;
q->bsg_job_size = dd_job_size;
@@ -243,10 +253,12 @@ struct request_queue *bsg_setup_queue(struct device *dev, char *name,
if (ret) {
printk(KERN_ERR "%s: bsg interface failed to "
"initialize - register queue\n", dev->kobj.name);
- blk_cleanup_queue(q);
- return ERR_PTR(ret);
+ goto out_cleanup_queue;
}
return q;
+out_cleanup_queue:
+ blk_cleanup_queue(q);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(bsg_setup_queue);