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block: split scsi_request out of struct request

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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>
This commit is contained in:
Christoph Hellwig
2017-01-27 09:46:29 +01:00
committed by Jens Axboe
parent 8ae94eb65b
commit 82ed4db499
49 changed files with 457 additions and 409 deletions
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34
block/bsg-lib.c
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@@ -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);