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bsg: split handling of SCSI CDBs vs transport requeues

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The current BSG design tries to shoe-horn the transport-specific
passthrough commands into the overall framework for SCSI passthrough
requests.  This has a couple problems:

 - each passthrough queue has to set the QUEUE_FLAG_SCSI_PASSTHROUGH flag
   despite not dealing with SCSI commands at all.  Because of that these
   queues could also incorrectly accept SCSI commands from in-kernel
   users or through the legacy SCSI_IOCTL_SEND_COMMAND ioctl.
 - the real SCSI bsg queues also incorrectly accept bsg requests of the
   BSG_SUB_PROTOCOL_SCSI_TRANSPORT type
 - the bsg transport code is almost unredable because it tries to reuse
   different SCSI concepts for its own purpose.

This patch instead adds a new bsg_ops structure to handle the two cases
differently, and thus solves all of the above problems.  Another side
effect is that the bsg-lib queues also don't need to embedd a
struct scsi_request anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-03-13 17:28:41 +01:00 committed by Jens Axboe
parent ef6fa64f9b
commit 17cb960f29
7 changed files with 268 additions and 235 deletions
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158
block/bsg-lib.c
View File

@ -27,6 +27,94 @@
#include <linux/bsg-lib.h>
#include <linux/export.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/sg.h>
#define uptr64(val) ((void __user *)(uintptr_t)(val))
static int bsg_transport_check_proto(struct sg_io_v4 *hdr)
{
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_TRANSPORT)
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
return 0;
}
static int bsg_transport_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
fmode_t mode)
{
struct bsg_job *job = blk_mq_rq_to_pdu(rq);
job->request_len = hdr->request_len;
job->request = memdup_user(uptr64(hdr->request), hdr->request_len);
if (IS_ERR(job->request))
return PTR_ERR(job->request);
return 0;
}
static int bsg_transport_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
{
struct bsg_job *job = blk_mq_rq_to_pdu(rq);
int ret = 0;
/*
* The assignments below don't make much sense, but are kept for
* bug by bug backwards compatibility:
*/
hdr->device_status = job->result & 0xff;
hdr->transport_status = host_byte(job->result);
hdr->driver_status = driver_byte(job->result);
hdr->info = 0;
if (hdr->device_status || hdr->transport_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
hdr->response_len = 0;
if (job->result < 0) {
/* we're only returning the result field in the reply */
job->reply_len = sizeof(u32);
ret = job->result;
}
if (job->reply_len && hdr->response) {
int len = min(hdr->max_response_len, job->reply_len);
if (copy_to_user(uptr64(hdr->response), job->reply, len))
ret = -EFAULT;
else
hdr->response_len = len;
}
/* we assume all request payload was transferred, residual == 0 */
hdr->dout_resid = 0;
if (rq->next_rq) {
unsigned int rsp_len = job->reply_payload.payload_len;
if (WARN_ON(job->reply_payload_rcv_len > rsp_len))
hdr->din_resid = 0;
else
hdr->din_resid = rsp_len - job->reply_payload_rcv_len;
} else {
hdr->din_resid = 0;
}
return ret;
}
static void bsg_transport_free_rq(struct request *rq)
{
struct bsg_job *job = blk_mq_rq_to_pdu(rq);
kfree(job->request);
}
static const struct bsg_ops bsg_transport_ops = {
.check_proto = bsg_transport_check_proto,
.fill_hdr = bsg_transport_fill_hdr,
.complete_rq = bsg_transport_complete_rq,
.free_rq = bsg_transport_free_rq,
};
/**
* bsg_teardown_job - routine to teardown a bsg job
@ -68,27 +156,9 @@ EXPORT_SYMBOL_GPL(bsg_job_get);
void bsg_job_done(struct bsg_job *job, int result,
unsigned int reply_payload_rcv_len)
{
struct request *req = blk_mq_rq_from_pdu(job);
struct request *rsp = req->next_rq;
int err;
err = job->sreq.result = result;
if (err < 0)
/* we're only returning the result field in the reply */
job->sreq.sense_len = sizeof(u32);
else
job->sreq.sense_len = job->reply_len;
/* we assume all request payload was transferred, residual == 0 */
job->sreq.resid_len = 0;
if (rsp) {
WARN_ON(reply_payload_rcv_len > scsi_req(rsp)->resid_len);
/* set reply (bidi) residual */
scsi_req(rsp)->resid_len -=
min(reply_payload_rcv_len, scsi_req(rsp)->resid_len);
}
blk_complete_request(req);
job->result = result;
job->reply_payload_rcv_len = reply_payload_rcv_len;
blk_complete_request(blk_mq_rq_from_pdu(job));
}
EXPORT_SYMBOL_GPL(bsg_job_done);
@ -113,7 +183,6 @@ 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;
@ -124,16 +193,13 @@ static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)
* @dev: device that is being sent the bsg request
* @req: BSG request that needs a job structure
*/
static int bsg_prepare_job(struct device *dev, struct request *req)
static bool bsg_prepare_job(struct device *dev, struct request *req)
{
struct request *rsp = req->next_rq;
struct scsi_request *rq = scsi_req(req);
struct bsg_job *job = blk_mq_rq_to_pdu(req);
int ret;
job->timeout = req->timeout;
job->request = rq->cmd;
job->request_len = rq->cmd_len;
if (req->bio) {
ret = bsg_map_buffer(&job->request_payload, req);
@ -149,12 +215,13 @@ static int bsg_prepare_job(struct device *dev, struct request *req)
/* take a reference for the request */
get_device(job->dev);
kref_init(&job->kref);
return 0;
return true;
failjob_rls_rqst_payload:
kfree(job->request_payload.sg_list);
failjob_rls_job:
return -ENOMEM;
job->result = -ENOMEM;
return false;
}
/**
@ -183,9 +250,7 @@ static void bsg_request_fn(struct request_queue *q)
break;
spin_unlock_irq(q->queue_lock);
ret = bsg_prepare_job(dev, req);
if (ret) {
scsi_req(req)->result = ret;
if (!bsg_prepare_job(dev, req)) {
blk_end_request_all(req, BLK_STS_OK);
spin_lock_irq(q->queue_lock);
continue;
@ -202,46 +267,34 @@ static void bsg_request_fn(struct request_queue *q)
spin_lock_irq(q->queue_lock);
}
/* called right after the request is allocated for the request_queue */
static int bsg_init_rq(struct request_queue *q, struct request *req, gfp_t gfp)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
/* called right after the request is allocated for the request_queue */
sreq->sense = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
if (!sreq->sense)
job->reply = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
if (!job->reply)
return -ENOMEM;
return 0;
}
/* called right before the request is given to the request_queue user */
static void bsg_initialize_rq(struct request *req)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
void *sense = sreq->sense;
/* called right before the request is given to the request_queue user */
void *reply = job->reply;
memset(job, 0, sizeof(*job));
scsi_req_init(sreq);
sreq->sense = sense;
sreq->sense_len = SCSI_SENSE_BUFFERSIZE;
job->reply = sense;
job->reply_len = sreq->sense_len;
job->reply = reply;
job->reply_len = SCSI_SENSE_BUFFERSIZE;
job->dd_data = job + 1;
}
static void bsg_exit_rq(struct request_queue *q, struct request *req)
{
struct bsg_job *job = blk_mq_rq_to_pdu(req);
struct scsi_request *sreq = &job->sreq;
kfree(sreq->sense);
kfree(job->reply);
}
/**
@ -275,11 +328,10 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
q->queuedata = dev;
q->bsg_job_fn = job_fn;
blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
blk_queue_softirq_done(q, bsg_softirq_done);
blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
ret = bsg_register_queue(q, dev, name, release);
ret = bsg_register_queue(q, dev, name, &bsg_transport_ops, release);
if (ret) {
printk(KERN_ERR "%s: bsg interface failed to "
"initialize - register queue\n", dev->kobj.name);

298
block/bsg.c
View File

@ -130,32 +130,110 @@ static inline struct hlist_head *bsg_dev_idx_hash(int index)
return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)];
}
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 mode)
{
struct scsi_request *req = scsi_req(rq);
#define uptr64(val) ((void __user *)(uintptr_t)(val))
if (hdr->request_len > BLK_MAX_CDB) {
req->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
if (!req->cmd)
static int bsg_scsi_check_proto(struct sg_io_v4 *hdr)
{
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
return -EINVAL;
return 0;
}
static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
fmode_t mode)
{
struct scsi_request *sreq = scsi_req(rq);
sreq->cmd_len = hdr->request_len;
if (sreq->cmd_len > BLK_MAX_CDB) {
sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
if (!sreq->cmd)
return -ENOMEM;
}
if (copy_from_user(req->cmd, (void __user *)(unsigned long)hdr->request,
hdr->request_len))
if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
return -EFAULT;
if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
if (blk_verify_command(req->cmd, mode))
return -EPERM;
} else if (!capable(CAP_SYS_RAWIO))
if (blk_verify_command(sreq->cmd, mode))
return -EPERM;
return 0;
}
static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
{
struct scsi_request *sreq = scsi_req(rq);
int ret = 0;
/*
* fill in request structure
* fill in all the output members
*/
req->cmd_len = hdr->request_len;
hdr->device_status = sreq->result & 0xff;
hdr->transport_status = host_byte(sreq->result);
hdr->driver_status = driver_byte(sreq->result);
hdr->info = 0;
if (hdr->device_status || hdr->transport_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
hdr->response_len = 0;
if (sreq->sense_len && hdr->response) {
int len = min_t(unsigned int, hdr->max_response_len,
sreq->sense_len);
if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
ret = -EFAULT;
else
hdr->response_len = len;
}
if (rq->next_rq) {
hdr->dout_resid = sreq->resid_len;
hdr->din_resid = scsi_req(rq->next_rq)->resid_len;
} else if (rq_data_dir(rq) == READ) {
hdr->din_resid = sreq->resid_len;
} else {
hdr->dout_resid = sreq->resid_len;
}
return ret;
}
static void bsg_scsi_free_rq(struct request *rq)
{
scsi_req_free_cmd(scsi_req(rq));
}
static const struct bsg_ops bsg_scsi_ops = {
.check_proto = bsg_scsi_check_proto,
.fill_hdr = bsg_scsi_fill_hdr,
.complete_rq = bsg_scsi_complete_rq,
.free_rq = bsg_scsi_free_rq,
};
static struct request *
bsg_map_hdr(struct request_queue *q, struct sg_io_v4 *hdr, fmode_t mode)
{
struct request *rq, *next_rq = NULL;
int ret;
if (!q->bsg_dev.class_dev)
return ERR_PTR(-ENXIO);
if (hdr->guard != 'Q')
return ERR_PTR(-EINVAL);
ret = q->bsg_dev.ops->check_proto(hdr);
if (ret)
return ERR_PTR(ret);
rq = blk_get_request(q, hdr->dout_xfer_len ?
REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
GFP_KERNEL);
if (IS_ERR(rq))
return rq;
ret = q->bsg_dev.ops->fill_hdr(rq, hdr, mode);
if (ret)
goto out;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
@ -165,79 +243,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
if (rq->timeout < BLK_MIN_SG_TIMEOUT)
rq->timeout = BLK_MIN_SG_TIMEOUT;
return 0;
}
/*
* Check if sg_io_v4 from user is allowed and valid
*/
static int
bsg_validate_sgv4_hdr(struct sg_io_v4 *hdr, int *op)
{
int ret = 0;
if (hdr->guard != 'Q')
return -EINVAL;
switch (hdr->protocol) {
case BSG_PROTOCOL_SCSI:
switch (hdr->subprotocol) {
case BSG_SUB_PROTOCOL_SCSI_CMD:
case BSG_SUB_PROTOCOL_SCSI_TRANSPORT:
break;
default:
ret = -EINVAL;
}
break;
default:
ret = -EINVAL;
}
*op = hdr->dout_xfer_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN;
return ret;
}
/*
* map sg_io_v4 to a request.
*/
static struct request *
bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t mode)
{
struct request_queue *q = bd->queue;
struct request *rq, *next_rq = NULL;
int ret;
unsigned int op, dxfer_len;
void __user *dxferp = NULL;
struct bsg_class_device *bcd = &q->bsg_dev;
/* if the LLD has been removed then the bsg_unregister_queue will
* eventually be called and the class_dev was freed, so we can no
* longer use this request_queue. Return no such address.
*/
if (!bcd->class_dev)
return ERR_PTR(-ENXIO);
bsg_dbg(bd, "map hdr %llx/%u %llx/%u\n",
(unsigned long long) hdr->dout_xferp,
hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
hdr->din_xfer_len);
ret = bsg_validate_sgv4_hdr(hdr, &op);
if (ret)
return ERR_PTR(ret);
/*
* map scatter-gather elements separately and string them to request
*/
rq = blk_get_request(q, op, GFP_KERNEL);
if (IS_ERR(rq))
return rq;
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, mode);
if (ret)
goto out;
if (op == REQ_OP_SCSI_OUT && hdr->din_xfer_len) {
if (hdr->dout_xfer_len && hdr->din_xfer_len) {
if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
ret = -EOPNOTSUPP;
goto out;
@ -246,42 +252,39 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t mode)
next_rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL);
if (IS_ERR(next_rq)) {
ret = PTR_ERR(next_rq);
next_rq = NULL;
goto out;
}
rq->next_rq = next_rq;
dxferp = (void __user *)(unsigned long)hdr->din_xferp;
ret = blk_rq_map_user(q, next_rq, NULL, dxferp,
rq->next_rq = next_rq;
ret = blk_rq_map_user(q, next_rq, NULL, uptr64(hdr->din_xferp),
hdr->din_xfer_len, GFP_KERNEL);
if (ret)
goto out;
goto out_free_nextrq;
}
if (hdr->dout_xfer_len) {
dxfer_len = hdr->dout_xfer_len;
dxferp = (void __user *)(unsigned long)hdr->dout_xferp;
ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr->dout_xferp),
hdr->dout_xfer_len, GFP_KERNEL);
} else if (hdr->din_xfer_len) {
dxfer_len = hdr->din_xfer_len;
dxferp = (void __user *)(unsigned long)hdr->din_xferp;
} else
dxfer_len = 0;
if (dxfer_len) {
ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len,
GFP_KERNEL);
if (ret)
goto out;
ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr->din_xferp),
hdr->din_xfer_len, GFP_KERNEL);
} else {
ret = blk_rq_map_user(q, rq, NULL, NULL, 0, GFP_KERNEL);
}
if (ret)
goto out_unmap_nextrq;
return rq;
out_unmap_nextrq:
if (rq->next_rq)
blk_rq_unmap_user(rq->next_rq->bio);
out_free_nextrq:
if (rq->next_rq)
blk_put_request(rq->next_rq);
out:
scsi_req_free_cmd(scsi_req(rq));
q->bsg_dev.ops->free_rq(rq);
blk_put_request(rq);
if (next_rq) {
blk_rq_unmap_user(next_rq->bio);
blk_put_request(next_rq);
}
return ERR_PTR(ret);
}
@ -383,56 +386,18 @@ 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;
int ret;
pr_debug("rq %p bio %p 0x%x\n", rq, bio, req->result);
/*
* fill in all the output members
*/
hdr->device_status = req->result & 0xff;
hdr->transport_status = host_byte(req->result);
hdr->driver_status = driver_byte(req->result);
hdr->info = 0;
if (hdr->device_status || hdr->transport_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
hdr->response_len = 0;
if (req->sense_len && hdr->response) {
int len = min_t(unsigned int, hdr->max_response_len,
req->sense_len);
ret = copy_to_user((void __user *)(unsigned long)hdr->response,
req->sense, len);
if (!ret)
hdr->response_len = len;
else
ret = -EFAULT;
}
ret = rq->q->bsg_dev.ops->complete_rq(rq, hdr);
if (rq->next_rq) {
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 = req->resid_len;
else
hdr->dout_resid = req->resid_len;
/*
* If the request generated a negative error number, return it
* (providing we aren't already returning an error); if it's
* just a protocol response (i.e. non negative), that gets
* processed above.
*/
if (!ret && req->result < 0)
ret = req->result;
}
blk_rq_unmap_user(bio);
scsi_req_free_cmd(req);
rq->q->bsg_dev.ops->free_rq(rq);
blk_put_request(rq);
return ret;
}
@ -614,7 +579,7 @@ 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, mode);
rq = bsg_map_hdr(bd->queue, &bc->hdr, mode);
if (IS_ERR(rq)) {
ret = PTR_ERR(rq);
rq = NULL;
@ -742,11 +707,6 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
struct bsg_device *bd;
unsigned char buf[32];
if (!blk_queue_scsi_passthrough(rq)) {
WARN_ONCE(true, "Attempt to register a non-SCSI queue\n");
return ERR_PTR(-EINVAL);
}
if (!blk_get_queue(rq))
return ERR_PTR(-ENXIO);
@ -907,7 +867,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (copy_from_user(&hdr, uarg, sizeof(hdr)))
return -EFAULT;
rq = bsg_map_hdr(bd, &hdr, file->f_mode);
rq = bsg_map_hdr(bd->queue, &hdr, file->f_mode);
if (IS_ERR(rq))
return PTR_ERR(rq);
@ -959,7 +919,8 @@ void bsg_unregister_queue(struct request_queue *q)
EXPORT_SYMBOL_GPL(bsg_unregister_queue);
int bsg_register_queue(struct request_queue *q, struct device *parent,
const char *name, void (*release)(struct device *))
const char *name, const struct bsg_ops *ops,
void (*release)(struct device *))
{
struct bsg_class_device *bcd;
dev_t dev;
@ -996,6 +957,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
bcd->queue = q;
bcd->parent = get_device(parent);
bcd->release = release;
bcd->ops = ops;
kref_init(&bcd->ref);
dev = MKDEV(bsg_major, bcd->minor);
class_dev = device_create(bsg_class, parent, dev, NULL, "%s", devname);
@ -1023,7 +985,17 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
mutex_unlock(&bsg_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(bsg_register_queue);
int bsg_scsi_register_queue(struct request_queue *q, struct device *parent)
{
if (!blk_queue_scsi_passthrough(q)) {
WARN_ONCE(true, "Attempt to register a non-SCSI queue\n");
return -EINVAL;
}
return bsg_register_queue(q, parent, NULL, &bsg_scsi_ops, NULL);
}
EXPORT_SYMBOL_GPL(bsg_scsi_register_queue);
static struct cdev bsg_cdev;

4
drivers/scsi/scsi_lib.c
View File

@ -2140,8 +2140,6 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
{
struct device *dev = shost->dma_dev;
blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
/*
* this limit is imposed by hardware restrictions
*/
@ -2239,6 +2237,7 @@ struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev)
}
__scsi_init_queue(shost, q);
blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
blk_queue_prep_rq(q, scsi_prep_fn);
blk_queue_unprep_rq(q, scsi_unprep_fn);
blk_queue_softirq_done(q, scsi_softirq_done);
@ -2270,6 +2269,7 @@ struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev)
sdev->request_queue->queuedata = sdev;
__scsi_init_queue(sdev->host, sdev->request_queue);
blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, sdev->request_queue);
return sdev->request_queue;
}

3
drivers/scsi/scsi_sysfs.c
View File

@ -1292,8 +1292,7 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
transport_add_device(&sdev->sdev_gendev);
sdev->is_visible = 1;
error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
if (error)
/* we're treating error on bsg register as non-fatal,
* so pretend nothing went wrong */

1
drivers/scsi/scsi_transport_sas.c
View File

@ -228,7 +228,6 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
*/
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
return 0;
}

4
include/linux/bsg-lib.h
View File

@ -38,7 +38,6 @@ struct bsg_buffer {
};
struct bsg_job {
struct scsi_request sreq;
struct device *dev;
struct kref kref;
@ -64,6 +63,9 @@ struct bsg_job {
struct bsg_buffer request_payload;
struct bsg_buffer reply_payload;
int result;
unsigned int reply_payload_rcv_len;
void *dd_data; /* Used for driver-specific storage */
};

35
include/linux/bsg.h
View File

@ -1,34 +1,43 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BSG_H
#define BSG_H
#ifndef _LINUX_BSG_H
#define _LINUX_BSG_H
#include <uapi/linux/bsg.h>
struct request;
#ifdef CONFIG_BLK_DEV_BSG
struct bsg_ops {
int (*check_proto)(struct sg_io_v4 *hdr);
int (*fill_hdr)(struct request *rq, struct sg_io_v4 *hdr,
fmode_t mode);
int (*complete_rq)(struct request *rq, struct sg_io_v4 *hdr);
void (*free_rq)(struct request *rq);
};
#if defined(CONFIG_BLK_DEV_BSG)
struct bsg_class_device {
struct device *class_dev;
struct device *parent;
int minor;
struct request_queue *queue;
struct kref ref;
const struct bsg_ops *ops;
void (*release)(struct device *);
};
extern int bsg_register_queue(struct request_queue *q,
struct device *parent, const char *name,
void (*release)(struct device *));
extern void bsg_unregister_queue(struct request_queue *);
int bsg_register_queue(struct request_queue *q, struct device *parent,
const char *name, const struct bsg_ops *ops,
void (*release)(struct device *));
int bsg_scsi_register_queue(struct request_queue *q, struct device *parent);
void bsg_unregister_queue(struct request_queue *q);
#else
static inline int bsg_register_queue(struct request_queue *q,
struct device *parent, const char *name,
void (*release)(struct device *))
static inline int bsg_scsi_register_queue(struct request_queue *q,
struct device *parent)
{
return 0;
}
static inline void bsg_unregister_queue(struct request_queue *q)
{
}
#endif
#endif
#endif /* CONFIG_BLK_DEV_BSG */
#endif /* _LINUX_BSG_H */