diff options
| -rw-r--r-- | drivers/scsi/st.c | 54 | ||||
| -rw-r--r-- | drivers/scsi/st.h | 1 |
2 files changed, 55 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 9d9e4b90f23..084a967b2e7 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -475,6 +475,60 @@ static void st_release_request(struct st_request *streq) kfree(streq); } +static void st_scsi_execute_end(struct request *req, int uptodate) +{ + struct st_request *SRpnt = req->end_io_data; + struct scsi_tape *STp = SRpnt->stp; + + STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; + STp->buffer->cmdstat.residual = req->data_len; + + if (SRpnt->waiting) + complete(SRpnt->waiting); + + blk_rq_unmap_user(SRpnt->bio); + __blk_put_request(req->q, req); +} + +static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, + int data_direction, void *buffer, unsigned bufflen, + int timeout, int retries) +{ + struct request *req; + struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; + int err = 0; + int write = (data_direction == DMA_TO_DEVICE); + + req = blk_get_request(SRpnt->stp->device->request_queue, write, + GFP_KERNEL); + if (!req) + return DRIVER_ERROR << 24; + + req->cmd_type = REQ_TYPE_BLOCK_PC; + req->cmd_flags |= REQ_QUIET; + + mdata->null_mapped = 1; + + err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, GFP_KERNEL); + if (err) { + blk_put_request(req); + return DRIVER_ERROR << 24; + } + + SRpnt->bio = req->bio; + req->cmd_len = COMMAND_SIZE(cmd[0]); + memset(req->cmd, 0, BLK_MAX_CDB); + memcpy(req->cmd, cmd, req->cmd_len); + req->sense = SRpnt->sense; + req->sense_len = 0; + req->timeout = timeout; + req->retries = retries; + req->end_io_data = SRpnt; + + blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); + return 0; +} + /* Do the scsi command. Waits until command performed if do_wait is true. Otherwise write_behind_check() is used to check that the command has finished. */ diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h index 74748abe824..77302fa8608 100644 --- a/drivers/scsi/st.h +++ b/drivers/scsi/st.h @@ -29,6 +29,7 @@ struct st_request { int result; struct scsi_tape *stp; struct completion *waiting; + struct bio *bio; }; /* The tape buffer descriptor. */ |