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[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:
Kai Makisara 2008-12-18 14:49:50 +09:00 committed by James Bottomley
parent edf69c58c7
commit 02ae2c0e84
1 changed files with 66 additions and 136 deletions
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202
drivers/scsi/st.c
View File

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