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106 lines
2.6 KiB
106 lines
2.6 KiB
// 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_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr, |
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fmode_t mode, unsigned int timeout) |
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{ |
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struct scsi_request *sreq; |
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struct request *rq; |
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struct bio *bio; |
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int ret; |
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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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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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rq = blk_get_request(q, hdr->dout_xfer_len ? |
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REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
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if (IS_ERR(rq)) |
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return PTR_ERR(rq); |
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rq->timeout = timeout; |
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ret = -ENOMEM; |
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sreq = scsi_req(rq); |
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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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goto out_put_request; |
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} |
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ret = -EFAULT; |
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if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len)) |
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goto out_free_cmd; |
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ret = -EPERM; |
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if (!scsi_cmd_allowed(sreq->cmd, mode)) |
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goto out_free_cmd; |
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ret = 0; |
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if (hdr->dout_xfer_len) { |
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ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp), |
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hdr->dout_xfer_len, GFP_KERNEL); |
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} else if (hdr->din_xfer_len) { |
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ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp), |
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hdr->din_xfer_len, GFP_KERNEL); |
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} |
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if (ret) |
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goto out_free_cmd; |
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bio = rq->bio; |
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blk_execute_rq(NULL, rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL)); |
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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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blk_rq_unmap_user(bio); |
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out_free_cmd: |
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scsi_req_free_cmd(scsi_req(rq)); |
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out_put_request: |
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blk_put_request(rq); |
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return ret; |
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} |
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struct bsg_device *scsi_bsg_register_queue(struct scsi_device *sdev) |
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{ |
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return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev, |
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dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn); |
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}
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