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>
diff --git a/block/bsg.c b/block/bsg.c
index a57046d..e34c332 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -85,7 +85,6 @@ struct bsg_command {
struct bio *bidi_bio;
int err;
struct sg_io_v4 hdr;
- char sense[SCSI_SENSE_BUFFERSIZE];
};
static void bsg_free_command(struct bsg_command *bc)
@@ -140,18 +139,20 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
struct sg_io_v4 *hdr, struct bsg_device *bd,
fmode_t has_write_perm)
{
+ struct scsi_request *req = scsi_req(rq);
+
if (hdr->request_len > BLK_MAX_CDB) {
- rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
- if (!rq->cmd)
+ req->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
+ if (!req->cmd)
return -ENOMEM;
}
- if (copy_from_user(rq->cmd, (void __user *)(unsigned long)hdr->request,
+ if (copy_from_user(req->cmd, (void __user *)(unsigned long)hdr->request,
hdr->request_len))
return -EFAULT;
if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
- if (blk_verify_command(rq->cmd, has_write_perm))
+ if (blk_verify_command(req->cmd, has_write_perm))
return -EPERM;
} else if (!capable(CAP_SYS_RAWIO))
return -EPERM;
@@ -159,7 +160,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
/*
* fill in request structure
*/
- rq->cmd_len = hdr->request_len;
+ req->cmd_len = hdr->request_len;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
@@ -205,8 +206,7 @@ bsg_validate_sgv4_hdr(struct sg_io_v4 *hdr, int *rw)
* map sg_io_v4 to a request.
*/
static struct request *
-bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
- u8 *sense)
+bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm)
{
struct request_queue *q = bd->queue;
struct request *rq, *next_rq = NULL;
@@ -236,7 +236,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
rq = blk_get_request(q, rw, GFP_KERNEL);
if (IS_ERR(rq))
return rq;
- blk_rq_set_block_pc(rq);
+ scsi_req_init(rq);
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm);
if (ret)
@@ -280,13 +280,9 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
goto out;
}
- rq->sense = sense;
- rq->sense_len = 0;
-
return rq;
out:
- if (rq->cmd != rq->__cmd)
- kfree(rq->cmd);
+ scsi_req_free_cmd(scsi_req(rq));
blk_put_request(rq);
if (next_rq) {
blk_rq_unmap_user(next_rq->bio);
@@ -393,6 +389,7 @@ static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd)
static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
struct bio *bio, struct bio *bidi_bio)
{
+ struct scsi_request *req = scsi_req(rq);
int ret = 0;
dprintk("rq %p bio %p 0x%x\n", rq, bio, rq->errors);
@@ -407,12 +404,12 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
hdr->info |= SG_INFO_CHECK;
hdr->response_len = 0;
- if (rq->sense_len && hdr->response) {
+ if (req->sense_len && hdr->response) {
int len = min_t(unsigned int, hdr->max_response_len,
- rq->sense_len);
+ req->sense_len);
ret = copy_to_user((void __user *)(unsigned long)hdr->response,
- rq->sense, len);
+ req->sense, len);
if (!ret)
hdr->response_len = len;
else
@@ -420,14 +417,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
}
if (rq->next_rq) {
- hdr->dout_resid = rq->resid_len;
- hdr->din_resid = rq->next_rq->resid_len;
+ hdr->dout_resid = req->resid_len;
+ hdr->din_resid = scsi_req(rq->next_rq)->resid_len;
blk_rq_unmap_user(bidi_bio);
blk_put_request(rq->next_rq);
} else if (rq_data_dir(rq) == READ)
- hdr->din_resid = rq->resid_len;
+ hdr->din_resid = req->resid_len;
else
- hdr->dout_resid = rq->resid_len;
+ hdr->dout_resid = req->resid_len;
/*
* If the request generated a negative error number, return it
@@ -439,8 +436,7 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
ret = rq->errors;
blk_rq_unmap_user(bio);
- if (rq->cmd != rq->__cmd)
- kfree(rq->cmd);
+ scsi_req_free_cmd(req);
blk_put_request(rq);
return ret;
@@ -625,7 +621,7 @@ static int __bsg_write(struct bsg_device *bd, const char __user *buf,
/*
* get a request, fill in the blanks, and add to request queue
*/
- rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm, bc->sense);
+ rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm);
if (IS_ERR(rq)) {
ret = PTR_ERR(rq);
rq = NULL;
@@ -911,12 +907,11 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct bio *bio, *bidi_bio = NULL;
struct sg_io_v4 hdr;
int at_head;
- u8 sense[SCSI_SENSE_BUFFERSIZE];
if (copy_from_user(&hdr, uarg, sizeof(hdr)))
return -EFAULT;
- rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE, sense);
+ rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE);
if (IS_ERR(rq))
return PTR_ERR(rq);