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7801104268
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>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bsg.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/sg.h>
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#include "scsi_priv.h"
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#define uptr64(val) ((void __user *)(uintptr_t)(val))
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static int scsi_bsg_check_proto(struct sg_io_v4 *hdr)
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{
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if (hdr->protocol != BSG_PROTOCOL_SCSI ||
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hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
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return -EINVAL;
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return 0;
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}
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static int scsi_bsg_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
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fmode_t mode)
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{
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struct scsi_request *sreq = scsi_req(rq);
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if (hdr->dout_xfer_len && hdr->din_xfer_len) {
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pr_warn_once("BIDI support in bsg has been removed.\n");
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return -EOPNOTSUPP;
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}
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sreq->cmd_len = hdr->request_len;
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if (sreq->cmd_len > BLK_MAX_CDB) {
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sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
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if (!sreq->cmd)
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return -ENOMEM;
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}
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if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
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return -EFAULT;
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if (blk_verify_command(sreq->cmd, mode))
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return -EPERM;
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return 0;
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}
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static int scsi_bsg_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
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{
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struct scsi_request *sreq = scsi_req(rq);
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int ret = 0;
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/*
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* fill in all the output members
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*/
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hdr->device_status = sreq->result & 0xff;
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hdr->transport_status = host_byte(sreq->result);
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hdr->driver_status = 0;
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if (scsi_status_is_check_condition(sreq->result))
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hdr->driver_status = DRIVER_SENSE;
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hdr->info = 0;
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if (hdr->device_status || hdr->transport_status || hdr->driver_status)
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hdr->info |= SG_INFO_CHECK;
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hdr->response_len = 0;
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if (sreq->sense_len && hdr->response) {
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int len = min_t(unsigned int, hdr->max_response_len,
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sreq->sense_len);
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if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
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ret = -EFAULT;
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else
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hdr->response_len = len;
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}
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if (rq_data_dir(rq) == READ)
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hdr->din_resid = sreq->resid_len;
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else
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hdr->dout_resid = sreq->resid_len;
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return ret;
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}
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static void scsi_bsg_free_rq(struct request *rq)
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{
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scsi_req_free_cmd(scsi_req(rq));
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}
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static const struct bsg_ops scsi_bsg_ops = {
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.check_proto = scsi_bsg_check_proto,
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.fill_hdr = scsi_bsg_fill_hdr,
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.complete_rq = scsi_bsg_complete_rq,
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.free_rq = scsi_bsg_free_rq,
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};
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int scsi_bsg_register_queue(struct request_queue *q, struct device *parent)
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{
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return bsg_register_queue(q, parent, dev_name(parent), &scsi_bsg_ops);
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}
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