*
* Purpose: Insert pre-formed command into request queue.
*
- * Arguments: SCpnt - command that is ready to be queued.
- * at_head - boolean. True if we should insert at head
+ * Arguments: cmd - command that is ready to be queued.
+ * at_head - boolean. True if we should insert at head
* of queue, false if we should insert at tail.
*
* Lock status: Assumed that lock is not held upon entry.
* for now), and then call the queue request function to actually
* process it.
*/
-int scsi_insert_special_cmd(Scsi_Cmnd * SCpnt, int at_head)
+int scsi_insert_special_cmd(struct scsi_cmnd *cmd, int at_head)
{
- blk_insert_request(SCpnt->device->request_queue, SCpnt->request,
- at_head, SCpnt);
+ blk_insert_request(cmd->device->request_queue, cmd->request,
+ at_head, cmd);
return 0;
}
*
* Purpose: Insert pre-formed request into request queue.
*
- * Arguments: SRpnt - request that is ready to be queued.
- * at_head - boolean. True if we should insert at head
+ * Arguments: sreq - request that is ready to be queued.
+ * at_head - boolean. True if we should insert at head
* of queue, false if we should insert at tail.
*
* Lock status: Assumed that lock is not held upon entry.
* for now), and then call the queue request function to actually
* process it.
*/
-int scsi_insert_special_req(Scsi_Request * SRpnt, int at_head)
+int scsi_insert_special_req(struct scsi_request *sreq, int at_head)
{
- /* This is used to insert SRpnt specials. Because users of
- * this function are apt to reuse requests with no modification,
- * we have to sanitise the request flags here
+ /*
+ * Because users of this function are apt to reuse requests with no
+ * modification, we have to sanitise the request flags here
*/
- SRpnt->sr_request->flags &= ~REQ_DONTPREP;
- blk_insert_request(SRpnt->sr_device->request_queue, SRpnt->sr_request,
- at_head, SRpnt);
+ sreq->sr_request->flags &= ~REQ_DONTPREP;
+ blk_insert_request(sreq->sr_device->request_queue, sreq->sr_request,
+ at_head, sreq);
return 0;
}
/*
* Function: scsi_init_cmd_errh()
*
- * Purpose: Initialize SCpnt fields related to error handling.
+ * Purpose: Initialize cmd fields related to error handling.
*
- * Arguments: SCpnt - command that is ready to be queued.
+ * Arguments: cmd - command that is ready to be queued.
*
* Returns: Nothing
*
* fields related to error handling. Typically this will
* be called once for each command, as required.
*/
-static int scsi_init_cmd_errh(Scsi_Cmnd * SCpnt)
+static int scsi_init_cmd_errh(struct scsi_cmnd *cmd)
{
- SCpnt->owner = SCSI_OWNER_MIDLEVEL;
- SCpnt->reset_chain = NULL;
- SCpnt->serial_number = 0;
- SCpnt->serial_number_at_timeout = 0;
- SCpnt->flags = 0;
- SCpnt->retries = 0;
-
- SCpnt->abort_reason = 0;
+ cmd->owner = SCSI_OWNER_MIDLEVEL;
+ cmd->reset_chain = NULL;
+ cmd->serial_number = 0;
+ cmd->serial_number_at_timeout = 0;
+ cmd->flags = 0;
+ cmd->retries = 0;
+ cmd->abort_reason = 0;
- memset((void *) SCpnt->sense_buffer, 0, sizeof SCpnt->sense_buffer);
+ memset(cmd->sense_buffer, 0, sizeof cmd->sense_buffer);
- if (SCpnt->cmd_len == 0)
- SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
+ if (cmd->cmd_len == 0)
+ cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
/*
* We need saved copies of a number of fields - this is because
* we will need to restore these values prior to running the actual
* command.
*/
- SCpnt->old_use_sg = SCpnt->use_sg;
- SCpnt->old_cmd_len = SCpnt->cmd_len;
- SCpnt->sc_old_data_direction = SCpnt->sc_data_direction;
- SCpnt->old_underflow = SCpnt->underflow;
- memcpy((void *) SCpnt->data_cmnd,
- (const void *) SCpnt->cmnd, sizeof(SCpnt->cmnd));
- SCpnt->buffer = SCpnt->request_buffer;
- SCpnt->bufflen = SCpnt->request_bufflen;
-
- SCpnt->reset_chain = NULL;
-
- SCpnt->internal_timeout = NORMAL_TIMEOUT;
- SCpnt->abort_reason = 0;
+ cmd->old_use_sg = cmd->use_sg;
+ cmd->old_cmd_len = cmd->cmd_len;
+ cmd->sc_old_data_direction = cmd->sc_data_direction;
+ cmd->old_underflow = cmd->underflow;
+ memcpy(cmd->data_cmnd, cmd->cmnd, sizeof(cmd->cmnd));
+ cmd->buffer = cmd->request_buffer;
+ cmd->bufflen = cmd->request_bufflen;
+ cmd->reset_chain = NULL;
+ cmd->internal_timeout = NORMAL_TIMEOUT;
+ cmd->abort_reason = 0;
return 1;
}
*
* Purpose: Restore the command state for a retry
*
- * Arguments: SCpnt - command to be restored
+ * Arguments: cmd - command to be restored
*
* Returns: Nothing
*
* Notes: Immediately prior to retrying a command, we need
* to restore certain fields that we saved above.
*/
-void scsi_setup_cmd_retry(Scsi_Cmnd *SCpnt)
+void scsi_setup_cmd_retry(struct scsi_cmnd *cmd)
{
- memcpy((void *) SCpnt->cmnd, (void *) SCpnt->data_cmnd,
- sizeof(SCpnt->data_cmnd));
- SCpnt->request_buffer = SCpnt->buffer;
- SCpnt->request_bufflen = SCpnt->bufflen;
- SCpnt->use_sg = SCpnt->old_use_sg;
- SCpnt->cmd_len = SCpnt->old_cmd_len;
- SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
- SCpnt->underflow = SCpnt->old_underflow;
+ memcpy(cmd->cmnd, cmd->data_cmnd, sizeof(cmd->data_cmnd));
+ cmd->request_buffer = cmd->buffer;
+ cmd->request_bufflen = cmd->bufflen;
+ cmd->use_sg = cmd->old_use_sg;
+ cmd->cmd_len = cmd->old_cmd_len;
+ cmd->sc_data_direction = cmd->sc_old_data_direction;
+ cmd->underflow = cmd->old_underflow;
}
/*
*
* Purpose: Handle post-processing of completed commands.
*
- * Arguments: SCpnt - command that may need to be requeued.
+ * Arguments: cmd - command that may need to be requeued.
*
* Returns: Nothing
*
* that a medium error occurred, and the sectors after
* the bad block need to be re-read.
*
- * If SCpnt is NULL, it means that the previous command
+ * If cmd is NULL, it means that the previous command
* was completely finished, and we should simply start
* a new command, if possible.
*
* permutations grows as 2**N, and if too many more special cases
* get added, we start to get screwed.
*/
-void scsi_queue_next_request(request_queue_t * q, Scsi_Cmnd * SCpnt)
+void scsi_queue_next_request(request_queue_t *q, struct scsi_cmnd *cmd)
{
- int all_clear;
+ struct scsi_device *sdev, *sdev2;
+ struct Scsi_Host *shost;
unsigned long flags;
- Scsi_Device *SDpnt, *SDpnt2;
- struct Scsi_Host *SHpnt;
+ int all_clear;
ASSERT_LOCK(q->queue_lock, 0);
spin_lock_irqsave(q->queue_lock, flags);
- if (SCpnt != NULL) {
+ if (cmd != NULL) {
/*
* For some reason, we are not done with this request.
* in which case we need to request the blocks that come after
* the bad sector.
*/
- SCpnt->request->special = (void *) SCpnt;
- if(blk_rq_tagged(SCpnt->request))
- blk_queue_end_tag(q, SCpnt->request);
- /* set REQ_SPECIAL - we have a command
+ cmd->request->special = cmd;
+ if (blk_rq_tagged(cmd->request))
+ blk_queue_end_tag(q, cmd->request);
+
+ /*
+ * set REQ_SPECIAL - we have a command
* clear REQ_DONTPREP - we assume the sg table has been
* nuked so we need to set it up again.
*/
- SCpnt->request->flags |= REQ_SPECIAL;
- SCpnt->request->flags &= ~REQ_DONTPREP;
- __elv_add_request(q, SCpnt->request, 0, 0);
+ cmd->request->flags |= REQ_SPECIAL;
+ cmd->request->flags &= ~REQ_DONTPREP;
+ __elv_add_request(q, cmd->request, 0, 0);
}
/*
*/
__blk_run_queue(q);
- SDpnt = (Scsi_Device *) q->queuedata;
- SHpnt = SDpnt->host;
+ sdev = q->queuedata;
+ shost = sdev->host;
/*
* If this is a single-lun device, and we are currently finished
* with special case code, then spin off separate versions and
* use function pointers to pick the right one.
*/
- if (SDpnt->single_lun && blk_queue_empty(q) && SDpnt->device_busy ==0 &&
- !SHpnt->host_blocked && !SHpnt->host_self_blocked &&
- !((SHpnt->can_queue > 0) && (SHpnt->host_busy >=
- SHpnt->can_queue))) {
- list_for_each_entry(SDpnt2, &SDpnt->same_target_siblings,
+ if (sdev->single_lun && blk_queue_empty(q) && sdev->device_busy ==0 &&
+ !shost->host_blocked && !shost->host_self_blocked &&
+ !((shost->can_queue > 0) && (shost->host_busy >=
+ shost->can_queue))) {
+ list_for_each_entry(sdev2, &sdev->same_target_siblings,
same_target_siblings) {
- if (!SDpnt2->device_blocked &&
- !blk_queue_empty(SDpnt2->request_queue)) {
- __blk_run_queue(SDpnt2->request_queue);
+ if (!sdev2->device_blocked &&
+ !blk_queue_empty(sdev2->request_queue)) {
+ __blk_run_queue(sdev2->request_queue);
break;
}
}
* other device might have become starved along the way.
*/
all_clear = 1;
- if (SHpnt->some_device_starved) {
- list_for_each_entry(SDpnt, &SHpnt->my_devices, siblings) {
- if ((SHpnt->can_queue > 0 && (SHpnt->host_busy >= SHpnt->can_queue))
- || (SHpnt->host_blocked)
- || (SHpnt->host_self_blocked)) {
+ if (shost->some_device_starved) {
+ list_for_each_entry(sdev, &shost->my_devices, siblings) {
+ if (shost->can_queue > 0 &&
+ shost->host_busy >= shost->can_queue)
break;
- }
- if (SDpnt->device_blocked || !SDpnt->starved) {
+ if (shost->host_blocked || shost->host_self_blocked)
+ break;
+ if (sdev->device_blocked || !sdev->starved)
continue;
- }
- __blk_run_queue(SDpnt->request_queue);
+ __blk_run_queue(sdev->request_queue);
all_clear = 0;
}
- if (SDpnt == NULL && all_clear) {
- SHpnt->some_device_starved = 0;
- }
+
+ if (sdev == NULL && all_clear)
+ shost->some_device_starved = 0;
}
spin_unlock_irqrestore(q->queue_lock, flags);
}
* Purpose: Post-processing of completed commands called from interrupt
* handler or a bottom-half handler.
*
- * Arguments: SCpnt - command that is complete.
+ * Arguments: cmd - command that is complete.
* uptodate - 1 if I/O indicates success, 0 for I/O error.
* sectors - number of sectors we want to mark.
* requeue - indicates whether we should requeue leftovers.
* We are guaranteeing that the request queue will be goosed
* at some point during this call.
*/
-static Scsi_Cmnd *scsi_end_request(Scsi_Cmnd * SCpnt,
- int uptodate,
- int sectors,
- int requeue)
+static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate,
+ int sectors, int requeue)
{
- request_queue_t *q = SCpnt->device->request_queue;
- struct request *req = SCpnt->request;
+ request_queue_t *q = cmd->device->request_queue;
+ struct request *req = cmd->request;
unsigned long flags;
ASSERT_LOCK(q->queue_lock, 0);
* to queue the remainder of them.
*/
if (end_that_request_first(req, uptodate, sectors)) {
- if (!requeue)
- return SCpnt;
-
- /*
- * Bleah. Leftovers again. Stick the leftovers in
- * the front of the queue, and goose the queue again.
- */
- scsi_queue_next_request(q, SCpnt);
- return SCpnt;
+ if (requeue) {
+ /*
+ * Bleah. Leftovers again. Stick the leftovers in
+ * the front of the queue, and goose the queue again.
+ */
+ scsi_queue_next_request(q, cmd);
+ }
+ return cmd;
}
add_disk_randomness(req->rq_disk);
* This will goose the queue request function at the end, so we don't
* need to worry about launching another command.
*/
- scsi_put_command(SCpnt);
+ scsi_put_command(cmd);
scsi_queue_next_request(q, NULL);
return NULL;
}
-static struct scatterlist *scsi_alloc_sgtable(Scsi_Cmnd *SCpnt, int gfp_mask)
+static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, int gfp_mask)
{
struct scsi_host_sg_pool *sgp;
struct scatterlist *sgl;
- BUG_ON(!SCpnt->use_sg);
+ BUG_ON(!cmd->use_sg);
- switch (SCpnt->use_sg) {
+ switch (cmd->use_sg) {
case 1 ... 8:
- SCpnt->sglist_len = 0;
+ cmd->sglist_len = 0;
break;
case 9 ... 16:
- SCpnt->sglist_len = 1;
+ cmd->sglist_len = 1;
break;
case 17 ... 32:
- SCpnt->sglist_len = 2;
+ cmd->sglist_len = 2;
break;
case 33 ... 64:
- SCpnt->sglist_len = 3;
+ cmd->sglist_len = 3;
break;
case 65 ... MAX_PHYS_SEGMENTS:
- SCpnt->sglist_len = 4;
+ cmd->sglist_len = 4;
break;
default:
return NULL;
}
- sgp = scsi_sg_pools + SCpnt->sglist_len;
+ sgp = scsi_sg_pools + cmd->sglist_len;
sgl = mempool_alloc(sgp->pool, gfp_mask);
if (sgl)
memset(sgl, 0, sgp->size);
mempool_free(sgl, sgp->pool);
}
-
/*
* Function: scsi_release_buffers()
*
* Purpose: Completion processing for block device I/O requests.
*
- * Arguments: SCpnt - command that we are bailing.
+ * Arguments: cmd - command that we are bailing.
*
* Lock status: Assumed that no lock is held upon entry.
*
* the scatter-gather table, and potentially any bounce
* buffers.
*/
-static void scsi_release_buffers(Scsi_Cmnd * SCpnt)
+static void scsi_release_buffers(struct scsi_cmnd *cmd)
{
- struct request *req = SCpnt->request;
+ struct request *req = cmd->request;
- ASSERT_LOCK(SCpnt->device->host->host_lock, 0);
+ ASSERT_LOCK(cmd->device->host->host_lock, 0);
/*
* Free up any indirection buffers we allocated for DMA purposes.
*/
- if (SCpnt->use_sg)
- scsi_free_sgtable(SCpnt->request_buffer, SCpnt->sglist_len);
- else if (SCpnt->request_buffer != req->buffer)
- kfree(SCpnt->request_buffer);
+ if (cmd->use_sg)
+ scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
+ else if (cmd->request_buffer != req->buffer)
+ kfree(cmd->request_buffer);
/*
* Zero these out. They now point to freed memory, and it is
* dangerous to hang onto the pointers.
*/
- SCpnt->buffer = NULL;
- SCpnt->bufflen = 0;
- SCpnt->request_buffer = NULL;
- SCpnt->request_bufflen = 0;
+ cmd->buffer = NULL;
+ cmd->bufflen = 0;
+ cmd->request_buffer = NULL;
+ cmd->request_bufflen = 0;
}
/*
*
* Purpose: Completion processing for block device I/O requests.
*
- * Arguments: SCpnt - command that is finished.
+ * Arguments: cmd - command that is finished.
*
* Lock status: Assumed that no lock is held upon entry.
*
* (the normal case for most drivers), we don't need
* the logic to deal with cleaning up afterwards.
*/
-void scsi_io_completion(Scsi_Cmnd * SCpnt, int good_sectors,
+void scsi_io_completion(struct scsi_cmnd *cmd, int good_sectors,
int block_sectors)
{
- int result = SCpnt->result;
- int this_count = SCpnt->bufflen >> 9;
- request_queue_t *q = SCpnt->device->request_queue;
- struct request *req = SCpnt->request;
+ int result = cmd->result;
+ int this_count = cmd->bufflen >> 9;
+ request_queue_t *q = cmd->device->request_queue;
+ struct request *req = cmd->request;
int clear_errors = 1;
/*
* For the case of a READ, we need to copy the data out of the
* bounce buffer and into the real buffer.
*/
- if (SCpnt->use_sg)
- scsi_free_sgtable(SCpnt->buffer, SCpnt->sglist_len);
- else if (SCpnt->buffer != req->buffer) {
+ if (cmd->use_sg)
+ scsi_free_sgtable(cmd->buffer, cmd->sglist_len);
+ else if (cmd->buffer != req->buffer) {
if (rq_data_dir(req) == READ) {
unsigned long flags;
char *to = bio_kmap_irq(req->bio, &flags);
- memcpy(to, SCpnt->buffer, SCpnt->bufflen);
+ memcpy(to, cmd->buffer, cmd->bufflen);
bio_kunmap_irq(to, &flags);
}
- kfree(SCpnt->buffer);
+ kfree(cmd->buffer);
}
if (blk_pc_request(req)) { /* SG_IO ioctl from block level */
req->errors = (driver_byte(result) & DRIVER_SENSE) ?
(CHECK_CONDITION << 1) : (result & 0xff);
- if (!result)
- req->data_len -= SCpnt->bufflen;
- else {
+ if (result) {
clear_errors = 0;
- if (SCpnt->sense_buffer[0] & 0x70) {
- int len = 8 + SCpnt->sense_buffer[7];
+ if (cmd->sense_buffer[0] & 0x70) {
+ int len = 8 + cmd->sense_buffer[7];
if (len > SCSI_SENSE_BUFFERSIZE)
len = SCSI_SENSE_BUFFERSIZE;
- memcpy(req->sense, SCpnt->sense_buffer, len);
+ memcpy(req->sense, cmd->sense_buffer, len);
req->sense_len = len;
}
- }
+ } else
+ req->data_len -= cmd->bufflen;
}
/*
* Zero these out. They now point to freed memory, and it is
* dangerous to hang onto the pointers.
*/
- SCpnt->buffer = NULL;
- SCpnt->bufflen = 0;
- SCpnt->request_buffer = NULL;
- SCpnt->request_bufflen = 0;
+ cmd->buffer = NULL;
+ cmd->bufflen = 0;
+ cmd->request_buffer = NULL;
+ cmd->request_bufflen = 0;
/*
* Next deal with any sectors which we were able to correctly
if (good_sectors >= 0) {
SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, %d sectors done.\n",
req->nr_sectors, good_sectors));
- SCSI_LOG_HLCOMPLETE(1, printk("use_sg is %d\n ", SCpnt->use_sg));
+ SCSI_LOG_HLCOMPLETE(1, printk("use_sg is %d\n ", cmd->use_sg));
if (clear_errors)
req->errors = 0;
* requeueing right here - we will requeue down below
* when we handle the bad sectors.
*/
- SCpnt = scsi_end_request(SCpnt, 1, good_sectors, result == 0);
+ cmd = scsi_end_request(cmd, 1, good_sectors, result == 0);
/*
* If the command completed without error, then either finish off the
* rest of the command, or start a new one.
*/
- if (result == 0 || SCpnt == NULL ) {
+ if (result == 0 || cmd == NULL ) {
return;
}
}
* Not yet implemented. A read will fail after being remapped,
* a write will call the strategy routine again.
*/
- if (SCpnt->device->remap) {
+ if (cmd->device->remap) {
result = 0;
}
#endif
}
- if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
+ if ((cmd->sense_buffer[0] & 0x7f) == 0x70) {
/*
* If the device is in the process of becoming ready,
* retry.
*/
- if (SCpnt->sense_buffer[12] == 0x04 &&
- SCpnt->sense_buffer[13] == 0x01) {
- scsi_queue_next_request(q, SCpnt);
+ if (cmd->sense_buffer[12] == 0x04 &&
+ cmd->sense_buffer[13] == 0x01) {
+ scsi_queue_next_request(q, cmd);
return;
}
- if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION) {
- if (SCpnt->device->removable) {
+ if ((cmd->sense_buffer[2] & 0xf) == UNIT_ATTENTION) {
+ if (cmd->device->removable) {
/* detected disc change. set a bit
* and quietly refuse further access.
*/
- SCpnt->device->changed = 1;
- SCpnt = scsi_end_request(SCpnt, 0,
+ cmd->device->changed = 1;
+ cmd = scsi_end_request(cmd, 0,
this_count, 1);
return;
} else {
* media change, so we just retry the
* request and see what happens.
*/
- scsi_queue_next_request(q, SCpnt);
+ scsi_queue_next_request(q, cmd);
return;
}
}
* past the end of the disk.
*/
- switch (SCpnt->sense_buffer[2]) {
+ switch (cmd->sense_buffer[2]) {
case ILLEGAL_REQUEST:
- if (SCpnt->device->ten) {
- SCpnt->device->ten = 0;
+ if (cmd->device->ten) {
+ cmd->device->ten = 0;
/*
* This will cause a retry with a 6-byte
* command.
*/
- scsi_queue_next_request(q, SCpnt);
+ scsi_queue_next_request(q, cmd);
result = 0;
} else {
- SCpnt = scsi_end_request(SCpnt, 0, this_count, 1);
+ cmd = scsi_end_request(cmd, 0, this_count, 1);
return;
}
break;
case NOT_READY:
printk(KERN_INFO "Device %s not ready.\n",
req->rq_disk ? req->rq_disk->disk_name : "");
- SCpnt = scsi_end_request(SCpnt, 0, this_count, 1);
+ cmd = scsi_end_request(cmd, 0, this_count, 1);
return;
break;
case MEDIUM_ERROR:
case VOLUME_OVERFLOW:
printk("scsi%d: ERROR on channel %d, id %d, lun %d, CDB: ",
- SCpnt->device->host->host_no, (int) SCpnt->device->channel,
- (int) SCpnt->device->id, (int) SCpnt->device->lun);
- print_command(SCpnt->data_cmnd);
- print_sense("sd", SCpnt);
- SCpnt = scsi_end_request(SCpnt, 0, block_sectors, 1);
+ cmd->device->host->host_no, (int) cmd->device->channel,
+ (int) cmd->device->id, (int) cmd->device->lun);
+ print_command(cmd->data_cmnd);
+ print_sense("sd", cmd);
+ cmd = scsi_end_request(cmd, 0, block_sectors, 1);
return;
default:
break;
* recovery reasons. Just retry the request
* and see what happens.
*/
- scsi_queue_next_request(q, SCpnt);
+ scsi_queue_next_request(q, cmd);
return;
}
if (result) {
- struct Scsi_Device_Template *STpnt;
+ struct Scsi_Device_Template *sdt;
- STpnt = scsi_get_request_dev(SCpnt->request);
+ sdt = scsi_get_request_dev(cmd->request);
printk("SCSI %s error : host %d channel %d id %d lun %d return code = %x\n",
- (STpnt ? STpnt->name : "device"),
- SCpnt->device->host->host_no,
- SCpnt->device->channel,
- SCpnt->device->id,
- SCpnt->device->lun, result);
+ (sdt ? sdt->name : "device"),
+ cmd->device->host->host_no,
+ cmd->device->channel,
+ cmd->device->id,
+ cmd->device->lun, result);
if (driver_byte(result) & DRIVER_SENSE)
- print_sense("sd", SCpnt);
+ print_sense("sd", cmd);
/*
* Mark a single buffer as not uptodate. Queue the remainder.
* We sometimes get this cruft in the event that a medium error
* isn't properly reported.
*/
- SCpnt = scsi_end_request(SCpnt, 0, req->current_nr_sectors, 1);
+ cmd = scsi_end_request(cmd, 0, req->current_nr_sectors, 1);
return;
}
}
*
* Purpose: SCSI I/O initialize function.
*
- * Arguments: SCpnt - Command descriptor we wish to initialize
+ * Arguments: cmd - Command descriptor we wish to initialize
*
* Returns: 0 on success
* BLKPREP_DEFER if the failure is retryable
* BLKPREP_KILL if the failure is fatal
*/
-static int scsi_init_io(Scsi_Cmnd *SCpnt)
+static int scsi_init_io(struct scsi_cmnd *cmd)
{
- struct request *req = SCpnt->request;
+ struct request *req = cmd->request;
struct scatterlist *sgpnt;
- int count, ret = 0;
+ int count;
/*
* if this is a rq->data based REQ_BLOCK_PC, setup for a non-sg xfer
*/
if ((req->flags & REQ_BLOCK_PC) && !req->bio) {
- SCpnt->request_bufflen = req->data_len;
- SCpnt->request_buffer = req->data;
+ cmd->request_bufflen = req->data_len;
+ cmd->request_buffer = req->data;
req->buffer = req->data;
- SCpnt->use_sg = 0;
+ cmd->use_sg = 0;
return 0;
}
* but now we do (it makes highmem I/O easier to support without
* kmapping pages)
*/
- SCpnt->use_sg = req->nr_phys_segments;
+ cmd->use_sg = req->nr_phys_segments;
/*
* if sg table allocation fails, requeue request later.
*/
- sgpnt = scsi_alloc_sgtable(SCpnt, GFP_ATOMIC);
+ sgpnt = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
if (unlikely(!sgpnt)) {
req->flags |= REQ_SPECIAL;
- ret = BLKPREP_DEFER;
- goto out;
+ return BLKPREP_DEFER;
}
- SCpnt->request_buffer = (char *) sgpnt;
- SCpnt->request_bufflen = req->nr_sectors << 9;
+ cmd->request_buffer = (char *) sgpnt;
+ cmd->request_bufflen = req->nr_sectors << 9;
if (blk_pc_request(req))
- SCpnt->request_bufflen = req->data_len;
+ cmd->request_bufflen = req->data_len;
req->buffer = NULL;
/*
* Next, walk the list, and fill in the addresses and sizes of
* each segment.
*/
- count = blk_rq_map_sg(req->q, req, SCpnt->request_buffer);
+ count = blk_rq_map_sg(req->q, req, cmd->request_buffer);
/*
* mapped well, send it off
*/
- if (count <= SCpnt->use_sg) {
- SCpnt->use_sg = count;
+ if (likely(count <= cmd->use_sg)) {
+ cmd->use_sg = count;
return 0;
}
printk(KERN_ERR "Incorrect number of segments after building list\n");
- printk(KERN_ERR "counted %d, received %d\n", count, SCpnt->use_sg);
+ printk(KERN_ERR "counted %d, received %d\n", count, cmd->use_sg);
printk(KERN_ERR "req nr_sec %lu, cur_nr_sec %u\n", req->nr_sectors,
req->current_nr_sectors);
/* release the command and kill it */
- scsi_put_command(SCpnt);
- ret = BLKPREP_KILL;
-out:
- return ret;
+ scsi_put_command(cmd);
+ return BLKPREP_KILL;
}
/*
int scsi_prep_fn(struct request_queue *q, struct request *req)
{
- struct Scsi_Device_Template *STpnt;
- Scsi_Cmnd *SCpnt;
- Scsi_Device *SDpnt;
-
- SDpnt = (Scsi_Device *) q->queuedata;
- BUG_ON(!SDpnt);
+ struct Scsi_Device_Template *sdt;
+ struct scsi_device *sdev = q->queuedata;
+ struct scsi_cmnd *cmd;
/*
* Find the actual device driver associated with this command.
* The SPECIAL requests are things like character device or
* ioctls, which did not originate from ll_rw_blk. Note that
- * the special field is also used to indicate the SCpnt for
+ * the special field is also used to indicate the cmd for
* the remainder of a partially fulfilled request that can
* come up when there is a medium error. We have to treat
* these two cases differently. We differentiate by looking
* at request->cmd, as this tells us the real story.
*/
if (req->flags & REQ_SPECIAL) {
- Scsi_Request *SRpnt;
+ struct scsi_request *sreq = req->special;
- STpnt = NULL;
- SCpnt = (Scsi_Cmnd *) req->special;
- SRpnt = (Scsi_Request *) req->special;
-
- if (SRpnt->sr_magic == SCSI_REQ_MAGIC) {
- SCpnt = scsi_get_command(SRpnt->sr_device, GFP_ATOMIC);
- if (!SCpnt)
+ if (sreq->sr_magic == SCSI_REQ_MAGIC) {
+ cmd = scsi_get_command(sreq->sr_device, GFP_ATOMIC);
+ if (unlikely(!cmd))
return BLKPREP_DEFER;
- scsi_init_cmd_from_req(SCpnt, SRpnt);
- }
-
+ scsi_init_cmd_from_req(cmd, sreq);
+ } else
+ cmd = req->special;
} else if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) {
/*
* Now try and find a command block that we can use.
*/
if (!req->special) {
- SCpnt = scsi_get_command(SDpnt, GFP_ATOMIC);
- if (unlikely(!SCpnt))
+ cmd = scsi_get_command(sdev, GFP_ATOMIC);
+ if (unlikely(!cmd))
return BLKPREP_DEFER;
} else
- SCpnt = req->special;
+ cmd = req->special;
/* pull a tag out of the request if we have one */
- SCpnt->tag = req->tag;
+ cmd->tag = req->tag;
} else {
blk_dump_rq_flags(req, "SCSI bad req");
return BLKPREP_KILL;
}
/* note the overloading of req->special. When the tag
- * is active it always means SCpnt. If the tag goes
+ * is active it always means cmd. If the tag goes
* back for re-queueing, it may be reset */
- req->special = SCpnt;
- SCpnt->request = req;
+ req->special = cmd;
+ cmd->request = req;
/*
* FIXME: drop the lock here because the functions below
* lock. We hope REQ_STARTED prevents anything untoward from
* happening now.
*/
-
if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) {
int ret;
* some kinds of consistency checking may cause the
* request to be rejected immediately.
*/
- STpnt = scsi_get_request_dev(req);
- BUG_ON(!STpnt);
+ sdt = scsi_get_request_dev(req);
+ BUG_ON(!sdt);
/*
* This sets up the scatter-gather table (allocating if
* required).
*/
- if ((ret = scsi_init_io(SCpnt)))
- /* BLKPREP_KILL return also releases the command */
+ ret = scsi_init_io(cmd);
+ if (ret) /* BLKPREP_KILL return also releases the command */
return ret;
/*
* Initialize the actual SCSI command for this request.
*/
- if (!STpnt->init_command(SCpnt)) {
- scsi_release_buffers(SCpnt);
- scsi_put_command(SCpnt);
+ if (unlikely(!sdt->init_command(cmd))) {
+ scsi_release_buffers(cmd);
+ scsi_put_command(cmd);
return BLKPREP_KILL;
}
}
- /* The request is now prepped, no need to come back here */
+
+ /*
+ * The request is now prepped, no need to come back here
+ */
req->flags |= REQ_DONTPREP;
return BLKPREP_OK;
}
/*
* Function: scsi_request_fn()
*
- * Purpose: Generic version of request function for SCSI hosts.
+ * Purpose: Main strategy routine for SCSI.
*
* Arguments: q - Pointer to actual queue.
*
* Returns: Nothing
*
* Lock status: IO request lock assumed to be held when called.
- *
- * Notes: The theory is that this function is something which individual
- * drivers could also supply if they wished to. The problem
- * is that we have 30 some odd low-level drivers in the kernel
- * tree already, and it would be most difficult to retrofit
- * this crap into all of them. Thus this function has the job
- * of acting as a generic queue manager for all of those existing
- * drivers.
*/
-void scsi_request_fn(request_queue_t * q)
+void scsi_request_fn(request_queue_t *q)
{
+ struct scsi_device *sdev = q->queuedata;
+ struct Scsi_Host *shost = sdev->host;
+ struct scsi_cmnd *cmd;
struct request *req;
- Scsi_Cmnd *SCpnt;
- Scsi_Device *SDpnt;
- struct Scsi_Host *SHpnt;
ASSERT_LOCK(q->queue_lock, 1);
- SDpnt = (Scsi_Device *) q->queuedata;
- if (!SDpnt) {
- panic("Missing device");
- }
- SHpnt = SDpnt->host;
-
/*
* To start with, we keep looping until the queue is empty, or until
* the host is no longer able to accept any more requests.
*/
- while (1 == 1) {
+ for (;;) {
/*
* Check this again - each time we loop through we will have
* released the lock and grabbed it again, so each time
* we need to check to see if the queue is plugged or not.
*/
- if (SHpnt->in_recovery || blk_queue_plugged(q))
+ if (shost->in_recovery || blk_queue_plugged(q))
return;
/*
*/
req = elv_next_request(q);
- if (SDpnt->device_busy >= SDpnt->queue_depth)
+ if (sdev->device_busy >= sdev->queue_depth)
break;
- if (SDpnt->single_lun && check_all_luns(SDpnt))
+ if (sdev->single_lun && check_all_luns(sdev))
break;
- if(SHpnt->host_busy == 0 && SHpnt->host_blocked) {
+ if (shost->host_busy == 0 && shost->host_blocked) {
/* unblock after host_blocked iterates to zero */
- if(--SHpnt->host_blocked == 0) {
- SCSI_LOG_MLQUEUE(3, printk("scsi%d unblocking host at zero depth\n", SHpnt->host_no));
+ if (--shost->host_blocked == 0) {
+ SCSI_LOG_MLQUEUE(3,
+ printk("scsi%d unblocking host at zero depth\n",
+ shost->host_no));
} else {
blk_plug_device(q);
break;
}
}
- if(SDpnt->device_busy == 0 && SDpnt->device_blocked) {
+
+ if (sdev->device_busy == 0 && sdev->device_blocked) {
/* unblock after device_blocked iterates to zero */
- if(--SDpnt->device_blocked == 0) {
- SCSI_LOG_MLQUEUE(3, printk("scsi%d (%d:%d) unblocking device at zero depth\n", SHpnt->host_no, SDpnt->id, SDpnt->lun));
+ if (--sdev->device_blocked == 0) {
+ SCSI_LOG_MLQUEUE(3,
+ printk("scsi%d (%d:%d) unblocking device at zero depth\n",
+ shost->host_no, sdev->id, sdev->lun));
} else {
blk_plug_device(q);
break;
}
}
+
/*
* If the device cannot accept another request, then quit.
*/
- if (SDpnt->device_blocked) {
+ if (sdev->device_blocked)
break;
- }
- if ((SHpnt->can_queue > 0 && (SHpnt->host_busy >= SHpnt->can_queue))
- || (SHpnt->host_blocked)
- || (SHpnt->host_self_blocked)) {
+ if ((shost->can_queue > 0 && shost->host_busy >= shost->can_queue) ||
+ shost->host_blocked || shost->host_self_blocked) {
/*
* If we are unable to process any commands at all for
* this device, then we consider it to be starved.
* little help getting it started again
* once the host isn't quite so busy.
*/
- if (SDpnt->device_busy == 0) {
- SDpnt->starved = 1;
- SHpnt->some_device_starved = 1;
+ if (sdev->device_busy == 0) {
+ sdev->starved = 1;
+ shost->some_device_starved = 1;
}
break;
- } else {
- SDpnt->starved = 0;
- }
+ } else
+ sdev->starved = 0;
/*
* If we couldn't find a request that could be queued, then we
if (blk_queue_empty(q))
break;
- if(!req) {
+ if (!req) {
/* If the device is busy, a returning I/O
* will restart the queue. Otherwise, we have
* to plug the queue */
- if(SDpnt->device_busy == 0)
+ if(sdev->device_busy == 0)
blk_plug_device(q);
break;
}
- SCpnt = (struct scsi_cmnd *)req->special;
+ cmd = req->special;
- /* Should be impossible for a correctly prepared request
+ /*
+ * Should be impossible for a correctly prepared request
* please mail the stack trace to linux-scsi@vger.kernel.org
*/
- BUG_ON(!SCpnt);
+ BUG_ON(!cmd);
/*
* Finally, before we release the lock, we copy the
* reason to search the list, because all of the
* commands in this queue are for the same device.
*/
- if(!(blk_queue_tagged(q) && (blk_queue_start_tag(q, req) == 0)))
+ if (!(blk_queue_tagged(q) && (blk_queue_start_tag(q, req) == 0)))
blkdev_dequeue_request(req);
/*
* Now bump the usage count for both the host and the
* device.
*/
- SHpnt->host_busy++;
- SDpnt->device_busy++;
+ shost->host_busy++;
+ sdev->device_busy++;
spin_unlock_irq(q->queue_lock);
/*
* Finally, initialize any error handling parameters, and set up
* the timers for timeouts.
*/
- scsi_init_cmd_errh(SCpnt);
+ scsi_init_cmd_errh(cmd);
/*
* Dispatch the command to the low-level driver.
*/
- scsi_dispatch_cmd(SCpnt);
+ scsi_dispatch_cmd(cmd);
/*
* Now we need to grab the lock again. We are about to mess
* Purpose: Utility function used by low-level drivers to prevent further
* commands from being queued to the device.
*
- * Arguments: SHpnt - Host in question
+ * Arguments: shost - Host in question
*
* Returns: Nothing
*
* get unblocked other than the low-level driver calling
* scsi_unblock_requests().
*/
-void scsi_block_requests(struct Scsi_Host * SHpnt)
+void scsi_block_requests(struct Scsi_Host *shost)
{
- SHpnt->host_self_blocked = 1;
+ shost->host_self_blocked = 1;
}
/*
* Purpose: Utility function used by low-level drivers to allow further
* commands from being queued to the device.
*
- * Arguments: SHpnt - Host in question
+ * Arguments: shost - Host in question
*
* Returns: Nothing
*
* internals of the scsi mid-layer won't require wholesale
* changes to drivers that use this feature.
*/
-void scsi_unblock_requests(struct Scsi_Host * SHpnt)
+void scsi_unblock_requests(struct Scsi_Host *shost)
{
- Scsi_Device *SDloop;
+ struct scsi_device *sdev;
- SHpnt->host_self_blocked = 0;
- /* Now that we are unblocked, try to start the queues. */
- list_for_each_entry(SDloop, &SHpnt->my_devices, siblings)
- scsi_queue_next_request(SDloop->request_queue, NULL);
+ shost->host_self_blocked = 0;
+
+ /*
+ * Now that we are unblocked, try to start the queues.
+ */
+ list_for_each_entry(sdev, &shost->my_devices, siblings)
+ scsi_queue_next_request(sdev->request_queue, NULL);
}
/*
* Purpose: Utility function used by low-level drivers to report that
* they have observed a bus reset on the bus being handled.
*
- * Arguments: SHpnt - Host in question
+ * Arguments: shost - Host in question
* channel - channel on which reset was observed.
*
* Returns: Nothing
* The main purpose of this is to make sure that a CHECK_CONDITION
* is properly treated.
*/
-void scsi_report_bus_reset(struct Scsi_Host * SHpnt, int channel)
+void scsi_report_bus_reset(struct Scsi_Host *shost, int channel)
{
- Scsi_Device *SDloop;
- list_for_each_entry(SDloop, &SHpnt->my_devices, siblings) {
- if (channel == SDloop->channel) {
- SDloop->was_reset = 1;
- SDloop->expecting_cc_ua = 1;
+ struct scsi_device *sdev;
+
+ list_for_each_entry(sdev, &shost->my_devices, siblings) {
+ if (channel == sdev->channel) {
+ sdev->was_reset = 1;
+ sdev->expecting_cc_ua = 1;
}
}
}
* The details of the implementation remain to be settled, however the
* stubs are here now so that the actual drivers will properly compile.
*/
-void scsi_register_blocked_host(struct Scsi_Host * SHpnt)
+void scsi_register_blocked_host(struct Scsi_Host * shost)
{
}
-void scsi_deregister_blocked_host(struct Scsi_Host * SHpnt)
+void scsi_deregister_blocked_host(struct Scsi_Host * shost)
{
}
projects / history.git / commitdiff