[SCSI] st: integrate st_scsi_kern_execute and st_do_scsi
This integrates st_scsi_kern_execute and st_do_scsi. IOW, it removes st_scsi_kern_execute. Then st has a single function, st_do_scsi, to perform SCSI commands. Signed-off-by: Kai Makisara <Kai.Makisara@kolumbus.fi> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
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@ -17,7 +17,7 @@
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Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
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*/
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static const char *verstr = "20080504";
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static const char *verstr = "20081215";
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#include <linux/module.h>
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@ -491,10 +491,13 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
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mdata->null_mapped = 1;
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err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, GFP_KERNEL);
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if (err) {
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blk_put_request(req);
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return DRIVER_ERROR << 24;
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if (bufflen) {
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err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
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GFP_KERNEL);
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if (err) {
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blk_put_request(req);
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return DRIVER_ERROR << 24;
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}
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}
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SRpnt->bio = req->bio;
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@ -577,28 +580,6 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
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return SRpnt;
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}
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static int st_scsi_kern_execute(struct st_request *streq,
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const unsigned char *cmd, int data_direction,
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void *buffer, unsigned bufflen, int timeout,
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int retries)
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{
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struct scsi_tape *stp = streq->stp;
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int ret, resid;
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stp->buffer->cmdstat.have_sense = 0;
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memcpy(streq->cmd, cmd, sizeof(streq->cmd));
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ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen,
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streq->sense, timeout, retries, 0, &resid);
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if (driver_byte(ret) & DRIVER_ERROR)
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return -EBUSY;
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stp->buffer->cmdstat.midlevel_result = streq->result = ret;
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stp->buffer->cmdstat.residual = resid;
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stp->buffer->syscall_result = st_chk_result(stp, streq);
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return 0;
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}
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/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
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write has been correct but EOM early warning reached, -EIO if write ended in
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@ -671,7 +652,6 @@ static int cross_eof(struct scsi_tape * STp, int forward)
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{
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struct st_request *SRpnt;
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unsigned char cmd[MAX_COMMAND_SIZE];
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int ret;
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cmd[0] = SPACE;
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cmd[1] = 0x01; /* Space FileMarks */
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@ -685,26 +665,20 @@ static int cross_eof(struct scsi_tape * STp, int forward)
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DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
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tape_name(STp), forward ? "forward" : "backward"));
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
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STp->device->request_queue->rq_timeout,
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MAX_RETRIES, 1);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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return (STp->buffer)->syscall_result;
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ret = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
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STp->device->request_queue->rq_timeout,
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MAX_RETRIES);
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if (ret)
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goto out;
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ret = STp->buffer->syscall_result;
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st_release_request(SRpnt);
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SRpnt = NULL;
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if ((STp->buffer)->cmdstat.midlevel_result != 0)
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printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
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tape_name(STp), forward ? "forward" : "backward");
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out:
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st_release_request(SRpnt);
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return ret;
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return (STp->buffer)->syscall_result;
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}
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@ -925,24 +899,21 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
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int attentions, waits, max_wait, scode;
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int retval = CHKRES_READY, new_session = 0;
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unsigned char cmd[MAX_COMMAND_SIZE];
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struct st_request *SRpnt;
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struct st_request *SRpnt = NULL;
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struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
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SRpnt = st_allocate_request(STp);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
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for (attentions=waits=0; ; ) {
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memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
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cmd[0] = TEST_UNIT_READY;
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SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
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STp->long_timeout, MAX_READY_RETRIES, 1);
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retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
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STp->long_timeout,
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MAX_READY_RETRIES);
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if (retval)
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if (!SRpnt) {
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retval = (STp->buffer)->syscall_result;
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break;
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}
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if (cmdstatp->have_sense) {
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@ -986,8 +957,8 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
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break;
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}
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st_release_request(SRpnt);
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if (SRpnt != NULL)
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st_release_request(SRpnt);
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return retval;
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}
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@ -1064,24 +1035,17 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
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}
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}
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SRpnt = st_allocate_request(STp);
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if (!SRpnt) {
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retval = STp->buffer->syscall_result;
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goto err_out;
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}
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if (STp->omit_blklims)
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STp->min_block = STp->max_block = (-1);
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else {
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memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
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cmd[0] = READ_BLOCK_LIMITS;
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retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
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STp->buffer->b_data, 6,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES);
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if (retval) {
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st_release_request(SRpnt);
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SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES, 1);
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if (!SRpnt) {
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retval = (STp->buffer)->syscall_result;
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goto err_out;
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}
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@ -1105,12 +1069,11 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
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cmd[0] = MODE_SENSE;
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cmd[4] = 12;
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retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
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STp->buffer->b_data, 12,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES);
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if (retval) {
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st_release_request(SRpnt);
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SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES, 1);
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if (!SRpnt) {
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retval = (STp->buffer)->syscall_result;
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goto err_out;
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}
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@ -1340,17 +1303,11 @@ static int st_flush(struct file *filp, fl_owner_t id)
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cmd[0] = WRITE_FILEMARKS;
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cmd[4] = 1 + STp->two_fm;
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
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STp->device->request_queue->rq_timeout,
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MAX_WRITE_RETRIES, 1);
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if (!SRpnt) {
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result = STp->buffer->syscall_result;
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goto out;
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}
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result = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
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STp->device->request_queue->rq_timeout,
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MAX_WRITE_RETRIES);
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if (result) {
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st_release_request(SRpnt);
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result = (STp->buffer)->syscall_result;
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goto out;
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}
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@ -2415,7 +2372,6 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
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{
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unsigned char cmd[MAX_COMMAND_SIZE];
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struct st_request *SRpnt;
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int ret;
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memset(cmd, 0, MAX_COMMAND_SIZE);
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cmd[0] = MODE_SENSE;
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@ -2424,17 +2380,14 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
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cmd[2] = page;
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cmd[4] = 255;
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SRpnt = st_allocate_request(STp);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
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STp->device->request_queue->rq_timeout, 0, 1);
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if (SRpnt == NULL)
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return (STp->buffer)->syscall_result;
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ret = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
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STp->buffer->b_data, cmd[4],
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STp->device->request_queue->rq_timeout,
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MAX_RETRIES);
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st_release_request(SRpnt);
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return ret ? : STp->buffer->syscall_result;
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return STp->buffer->syscall_result;
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}
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@ -2442,9 +2395,10 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
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in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
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static int write_mode_page(struct scsi_tape *STp, int page, int slow)
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{
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int pgo, timeout, ret = 0;
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int pgo;
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unsigned char cmd[MAX_COMMAND_SIZE];
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struct st_request *SRpnt;
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int timeout;
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memset(cmd, 0, MAX_COMMAND_SIZE);
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cmd[0] = MODE_SELECT;
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@ -2458,21 +2412,16 @@ static int write_mode_page(struct scsi_tape *STp, int page, int slow)
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(STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
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(STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
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SRpnt = st_allocate_request(STp);
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if (!SRpnt)
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return ret;
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timeout = slow ? STp->long_timeout :
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STp->device->request_queue->rq_timeout;
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ret = st_scsi_kern_execute(SRpnt, cmd, DMA_TO_DEVICE,
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STp->buffer->b_data, cmd[4], timeout, 0);
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if (!ret)
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ret = STp->buffer->syscall_result;
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timeout = slow ?
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STp->long_timeout : STp->device->request_queue->rq_timeout;
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SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
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timeout, 0, 1);
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if (SRpnt == NULL)
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return (STp->buffer)->syscall_result;
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st_release_request(SRpnt);
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return ret;
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return STp->buffer->syscall_result;
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}
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@ -2590,16 +2539,13 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
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printk(ST_DEB_MSG "%s: Loading tape.\n", name);
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);
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
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timeout, MAX_RETRIES, 1);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, timeout,
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MAX_RETRIES);
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if (retval)
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goto out;
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return (STp->buffer)->syscall_result;
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retval = (STp->buffer)->syscall_result;
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st_release_request(SRpnt);
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if (!retval) { /* SCSI command successful */
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@ -2618,8 +2564,6 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
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STps = &(STp->ps[STp->partition]);
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STps->drv_file = STps->drv_block = (-1);
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}
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out:
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st_release_request(SRpnt);
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return retval;
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}
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@ -2895,15 +2839,12 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
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return (-ENOSYS);
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}
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
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timeout, MAX_RETRIES, 1);
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if (!SRpnt)
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return (STp->buffer)->syscall_result;
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ioctl_result = st_scsi_kern_execute(SRpnt, cmd, direction,
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STp->buffer->b_data, datalen,
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timeout, MAX_RETRIES);
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if (!ioctl_result)
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ioctl_result = (STp->buffer)->syscall_result;
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ioctl_result = (STp->buffer)->syscall_result;
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if (!ioctl_result) { /* SCSI command successful */
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st_release_request(SRpnt);
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@ -3065,17 +3006,11 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
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if (!logical && !STp->scsi2_logical)
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scmd[1] = 1;
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}
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES, 1);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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result = st_scsi_kern_execute(SRpnt, scmd, DMA_FROM_DEVICE,
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STp->buffer->b_data, 20,
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STp->device->request_queue->rq_timeout,
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MAX_READY_RETRIES);
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if (result)
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goto out;
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return (STp->buffer)->syscall_result;
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if ((STp->buffer)->syscall_result != 0 ||
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(STp->device->scsi_level >= SCSI_2 &&
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@ -3103,7 +3038,6 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
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DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
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*block, *partition));
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}
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out:
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st_release_request(SRpnt);
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SRpnt = NULL;
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@ -3178,14 +3112,10 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
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timeout = STp->device->request_queue->rq_timeout;
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}
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SRpnt = st_allocate_request(STp);
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SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
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timeout, MAX_READY_RETRIES, 1);
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if (!SRpnt)
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return STp->buffer->syscall_result;
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result = st_scsi_kern_execute(SRpnt, scmd, DMA_NONE, NULL, 0,
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timeout, MAX_READY_RETRIES);
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if (result)
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goto out;
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return (STp->buffer)->syscall_result;
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STps->drv_block = STps->drv_file = (-1);
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STps->eof = ST_NOEOF;
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@ -3210,7 +3140,7 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
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STps->drv_block = STps->drv_file = 0;
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result = 0;
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}
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out:
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st_release_request(SRpnt);
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SRpnt = NULL;
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