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@xxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
---
block/bsg-lib.c | 158 +++++++++++++++--------
block/bsg.c | 262 +++++++++++++++++---------------------
drivers/scsi/scsi_lib.c | 4 +-
drivers/scsi/scsi_sysfs.c | 3 +-
drivers/scsi/scsi_transport_sas.c | 1 -
include/linux/bsg-lib.h | 4 +-
include/linux/bsg.h | 35 +++--
7 files changed, 250 insertions(+), 217 deletions(-)
diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index f2c2d54a61b4..fc2e5ff2c4b9 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -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);
diff --git a/block/bsg.c b/block/bsg.c
index 06dc96e1f670..defa06c11858 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -130,114 +130,120 @@ 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)
+#define uptr64(val) ((void __user *)(uintptr_t)(val))
+
+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 *req = scsi_req(rq);
+ struct scsi_request *sreq = scsi_req(rq);
- if (hdr->request_len > BLK_MAX_CDB) {
- req->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
- if (!req->cmd)
+ 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;
-
- /*
- * fill in request structure
- */
- req->cmd_len = hdr->request_len;
-
- rq->timeout = msecs_to_jiffies(hdr->timeout);
- if (!rq->timeout)
- rq->timeout = q->sg_timeout;
- if (!rq->timeout)
- rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
- 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)
+static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
{
+ struct scsi_request *sreq = scsi_req(rq);
int ret = 0;
- if (hdr->guard != 'Q')
- return -EINVAL;
+ /*
+ * fill in all the output members
+ */
+ 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;
- 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;
+ 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;
}
- *op = hdr->dout_xfer_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN;
return ret;
}
-/*
- * map sg_io_v4 to a request.
- */
+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 bsg_device *bd, struct sg_io_v4 *hdr, fmode_t mode)
+bsg_map_hdr(struct request_queue *q, 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)
+ if (!q->bsg_dev.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);
+ if (hdr->guard != 'Q')
+ return ERR_PTR(-EINVAL);
- ret = bsg_validate_sgv4_hdr(hdr, &op);
+ ret = q->bsg_dev.ops->check_proto(hdr);
if (ret)
return ERR_PTR(ret);
- /*
- * map scatter-gather elements separately and string them to request
- */
- rq = blk_get_request(q, op, GFP_KERNEL);
+ 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 = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, mode);
+ ret = q->bsg_dev.ops->fill_hdr(rq, hdr, mode);
if (ret)
goto out;
- if (op == REQ_OP_SCSI_OUT && hdr->din_xfer_len) {
+ rq->timeout = msecs_to_jiffies(hdr->timeout);
+ if (!rq->timeout)
+ rq->timeout = q->sg_timeout;
+ if (!rq->timeout)
+ rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
+ if (rq->timeout < BLK_MIN_SG_TIMEOUT)
+ rq->timeout = BLK_MIN_SG_TIMEOUT;
+
+ 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;
-
- 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);
+ int ret;
- 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;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 538152f3528e..37c1d63e847e 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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;
}
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 91b90f672d23..7142c8be1099 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -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 */
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 7c0987616684..08acbabfae07 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -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;
}
diff --git a/include/linux/bsg-lib.h b/include/linux/bsg-lib.h
index 08762d297cbd..28a7ccc55c89 100644
--- a/include/linux/bsg-lib.h
+++ b/include/linux/bsg-lib.h
@@ -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 */
};
diff --git a/include/linux/bsg.h b/include/linux/bsg.h
index 2a202e41a3af..0c7dd9ceb139 100644
--- a/include/linux/bsg.h
+++ b/include/linux/bsg.h
@@ -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 */
--
2.14.2
