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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. Signed-off-by: Christoph Hellwig <hch@lst.de>
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Original file line number | Diff line number | Diff line change |
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@@ -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" | ||
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#define uptr64(val) ((void __user *)(uintptr_t)(val)) | ||
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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; | ||
} | ||
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static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr, | ||
fmode_t mode) | ||
{ | ||
struct scsi_request *sreq = scsi_req(rq); | ||
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if (hdr->dout_xfer_len && hdr->din_xfer_len) { | ||
pr_warn_once("BIDI support in bsg has been removed.\n"); | ||
return -EOPNOTSUPP; | ||
} | ||
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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; | ||
} | ||
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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; | ||
} | ||
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static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr) | ||
{ | ||
struct scsi_request *sreq = scsi_req(rq); | ||
int ret = 0; | ||
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/* | ||
* 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; | ||
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if (sreq->sense_len && hdr->response) { | ||
int len = min_t(unsigned int, hdr->max_response_len, | ||
sreq->sense_len); | ||
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if (copy_to_user(uptr64(hdr->response), sreq->sense, len)) | ||
ret = -EFAULT; | ||
else | ||
hdr->response_len = len; | ||
} | ||
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if (rq_data_dir(rq) == READ) | ||
hdr->din_resid = sreq->resid_len; | ||
else | ||
hdr->dout_resid = sreq->resid_len; | ||
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return ret; | ||
} | ||
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static void bsg_scsi_free_rq(struct request *rq) | ||
{ | ||
scsi_req_free_cmd(scsi_req(rq)); | ||
} | ||
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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, | ||
}; | ||
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int bsg_scsi_register_queue(struct request_queue *q, struct device *parent) | ||
{ | ||
return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops); | ||
} |
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