scsi: bsg: Move bsg_scsi_ops to drivers/scsi/
Move the SCSI-specific bsg code in the SCSI midlayer instead of in the
common bsg code. This just keeps the common bsg code block/ and also
allows building it as a module.
Link: https://lore.kernel.org/r/20210724072033.1284840-15-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c
new file mode 100644
index 0000000..3bdb289
--- /dev/null
+++ b/drivers/scsi/scsi_bsg.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bsg.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/sg.h>
+#include "scsi_priv.h"
+
+#define uptr64(val) ((void __user *)(uintptr_t)(val))
+
+static int scsi_bsg_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 scsi_bsg_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
+ fmode_t mode)
+{
+ struct scsi_request *sreq = scsi_req(rq);
+
+ if (hdr->dout_xfer_len && hdr->din_xfer_len) {
+ pr_warn_once("BIDI support in bsg has been removed.\n");
+ return -EOPNOTSUPP;
+ }
+
+ 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(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
+ return -EFAULT;
+ if (blk_verify_command(sreq->cmd, mode))
+ return -EPERM;
+ return 0;
+}
+
+static int scsi_bsg_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
+{
+ struct scsi_request *sreq = scsi_req(rq);
+ int ret = 0;
+
+ /*
+ * fill in all the output members
+ */
+ hdr->device_status = sreq->result & 0xff;
+ hdr->transport_status = host_byte(sreq->result);
+ hdr->driver_status = 0;
+ if (scsi_status_is_check_condition(sreq->result))
+ hdr->driver_status = DRIVER_SENSE;
+ 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_data_dir(rq) == READ)
+ hdr->din_resid = sreq->resid_len;
+ else
+ hdr->dout_resid = sreq->resid_len;
+
+ return ret;
+}
+
+static void scsi_bsg_free_rq(struct request *rq)
+{
+ scsi_req_free_cmd(scsi_req(rq));
+}
+
+static const struct bsg_ops scsi_bsg_ops = {
+ .check_proto = scsi_bsg_check_proto,
+ .fill_hdr = scsi_bsg_fill_hdr,
+ .complete_rq = scsi_bsg_complete_rq,
+ .free_rq = scsi_bsg_free_rq,
+};
+
+int scsi_bsg_register_queue(struct request_queue *q, struct device *parent)
+{
+ return bsg_register_queue(q, parent, dev_name(parent), &scsi_bsg_ops);
+}