diff options
author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-12-18 14:49:41 +0900 |
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committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-01-02 11:54:45 -0600 |
commit | 13b53b443482623d33fd9446289d320e1c719f02 (patch) | |
tree | ce987e03335e3cc34f2d0cd47f9769af56476bde /drivers/scsi/st.c | |
parent | d0e1ae31be226e83cdd0684625bf1535518ee0d3 (diff) | |
download | linux-13b53b443482623d33fd9446289d320e1c719f02.tar.gz |
[SCSI] st: add st_scsi_execute helper function
st_scsi_execute is a helper function to perform SCSI commands involving data transfer between user and kernel space (st_read and st_write). It's the future plan to combine this with st_scsi_kern_execute helper function. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Kai Makisara <Kai.Makisara@kolumbus.fi> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/st.c')
-rw-r--r-- | drivers/scsi/st.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 9d9e4b90f23b..084a967b2e78 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. */ |