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[SCSI] Get rid of scsi_cmnd->done 

The ULD ->done callback moves into the scsi_driver.  By moving the call
to scsi_io_completion() from scsi_blk_pc_done() to scsi_finish_command(),
we can eliminate the latter entirely.  By returning 'good_bytes' from
the ->done callback (rather than invoking scsi_io_completion()), we can
stop exporting scsi_io_completion().

Also move the prototypes from sd.h to sd.c as they're all internal anyway.
Rename sd_rw_intr to sd_done and rw_intr to sr_done.

Inspired-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox 2007-09-25 12:42:04 -04:00 committed by James Bottomley
parent 687d2bc487
commit 6f5391c283
9 changed files with 43 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/scsi/scsi.c
View File

@ -59,6 +59,7 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
@ -367,9 +368,8 @@ void scsi_log_send(struct scsi_cmnd *cmd)
scsi_print_command(cmd);
if (level > 3) {
printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
" done = 0x%p, queuecommand 0x%p\n",
" queuecommand 0x%p\n",
scsi_sglist(cmd), scsi_bufflen(cmd),
cmd->done,
cmd->device->host->hostt->queuecommand);
}
@ -654,6 +654,12 @@ void __scsi_done(struct scsi_cmnd *cmd)
blk_complete_request(rq);
}
/* Move this to a header if it becomes more generally useful */
static struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
{
return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
}
/*
* Function: scsi_finish_command
*
@ -665,6 +671,8 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct Scsi_Host *shost = sdev->host;
struct scsi_driver *drv;
unsigned int good_bytes;
scsi_device_unbusy(sdev);
@ -690,7 +698,13 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
"Notifying upper driver of completion "
"(result %x)\n", cmd->result));
cmd->done(cmd);
good_bytes = cmd->request_bufflen;
if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
drv = scsi_cmd_to_driver(cmd);
if (drv->done)
good_bytes = drv->done(cmd);
}
scsi_io_completion(cmd, good_bytes);
}
EXPORT_SYMBOL(scsi_finish_command);

1
drivers/scsi/scsi_error.c
View File

@ -1671,7 +1671,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
scmd->scsi_done = scsi_reset_provider_done_command;
scmd->done = NULL;
scmd->request_buffer = NULL;
scmd->request_bufflen = 0;

14
drivers/scsi/scsi_lib.c
View File

@ -982,7 +982,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
}
scsi_end_request(cmd, 0, this_count, !result);
}
EXPORT_SYMBOL(scsi_io_completion);
/*
* Function: scsi_init_io()
@ -1063,18 +1062,6 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
return cmd;
}
static void scsi_blk_pc_done(struct scsi_cmnd *cmd)
{
BUG_ON(!blk_pc_request(cmd->request));
/*
* This will complete the whole command with uptodate=1 so
* as far as the block layer is concerned the command completed
* successfully. Since this is a REQ_BLOCK_PC command the
* caller should check the request's errors value
*/
scsi_io_completion(cmd, cmd->request_bufflen);
}
int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
{
struct scsi_cmnd *cmd;
@ -1124,7 +1111,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
cmd->transfersize = req->data_len;
cmd->allowed = req->retries;
cmd->timeout_per_command = req->timeout;
cmd->done = scsi_blk_pc_done;
return BLKPREP_OK;
}
EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);

1
drivers/scsi/scsi_priv.h
View File

@ -68,6 +68,7 @@ extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
extern void scsi_device_unbusy(struct scsi_device *sdev);
extern int scsi_queue_insert(struct scsi_cmnd *cmd, int reason);
extern void scsi_next_command(struct scsi_cmnd *cmd);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
extern void scsi_run_host_queues(struct Scsi_Host *shost);
extern struct request_queue *scsi_alloc_queue(struct scsi_device *sdev);
extern void scsi_free_queue(struct request_queue *q);

28
drivers/scsi/sd.c
View File

@ -86,6 +86,19 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
static int sd_revalidate_disk(struct gendisk *);
static int sd_probe(struct device *);
static int sd_remove(struct device *);
static void sd_shutdown(struct device *);
static int sd_suspend(struct device *, pm_message_t state);
static int sd_resume(struct device *);
static void sd_rescan(struct device *);
static int sd_done(struct scsi_cmnd *);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
static void scsi_disk_release(struct class_device *cdev);
static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
static void sd_print_result(struct scsi_disk *, int);
static DEFINE_IDR(sd_index_idr);
static DEFINE_SPINLOCK(sd_index_lock);
@ -240,6 +253,7 @@ static struct scsi_driver sd_template = {
.shutdown = sd_shutdown,
},
.rescan = sd_rescan,
.done = sd_done,
};
/*
@ -508,12 +522,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->allowed = SD_MAX_RETRIES;
SCpnt->timeout_per_command = timeout;
/*
* This is the completion routine we use. This is matched in terms
* of capability to this function.
*/
SCpnt->done = sd_rw_intr;
/*
* This indicates that the command is ready from our end to be
* queued.
@ -908,13 +916,13 @@ static struct block_device_operations sd_fops = {
};
/**
* sd_rw_intr - bottom half handler: called when the lower level
* sd_done - bottom half handler: called when the lower level
* driver has completed (successfully or otherwise) a scsi command.
* @SCpnt: mid-level's per command structure.
*
* Note: potentially run from within an ISR. Must not block.
**/
static void sd_rw_intr(struct scsi_cmnd * SCpnt)
static int sd_done(struct scsi_cmnd *SCpnt)
{
int result = SCpnt->result;
unsigned int xfer_size = SCpnt->request_bufflen;
@ -935,7 +943,7 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt)
SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
if (sense_valid) {
SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
"sd_rw_intr: sb[respc,sk,asc,"
"sd_done: sb[respc,sk,asc,"
"ascq]=%x,%x,%x,%x\n",
sshdr.response_code,
sshdr.sense_key, sshdr.asc,
@ -1007,7 +1015,7 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt)
break;
}
out:
scsi_io_completion(SCpnt, good_bytes);
return good_bytes;
}
static int media_not_present(struct scsi_disk *sdkp,

21
drivers/scsi/sr.c
View File

@ -78,6 +78,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
static int sr_probe(struct device *);
static int sr_remove(struct device *);
static int sr_done(struct scsi_cmnd *);
static struct scsi_driver sr_template = {
.owner = THIS_MODULE,
@ -86,6 +87,7 @@ static struct scsi_driver sr_template = {
.probe = sr_probe,
.remove = sr_remove,
},
.done = sr_done,
};
static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
@ -208,12 +210,12 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
}
/*
* rw_intr is the interrupt routine for the device driver.
* sr_done is the interrupt routine for the device driver.
*
* It will be notified on the end of a SCSI read / write, and will take on
* It will be notified on the end of a SCSI read / write, and will take one
* of several actions based on success or failure.
*/
static void rw_intr(struct scsi_cmnd * SCpnt)
static int sr_done(struct scsi_cmnd *SCpnt)
{
int result = SCpnt->result;
int this_count = SCpnt->request_bufflen;
@ -286,12 +288,7 @@ static void rw_intr(struct scsi_cmnd * SCpnt)
}
}
/*
* This calls the generic completion function, now that we know
* how many actual sectors finished, and how many sectors we need
* to say have failed.
*/
scsi_io_completion(SCpnt, good_bytes);
return good_bytes;
}
static int sr_prep_fn(struct request_queue *q, struct request *rq)
@ -427,12 +424,6 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->allowed = MAX_RETRIES;
SCpnt->timeout_per_command = timeout;
/*
* This is the completion routine we use. This is matched in terms
* of capability to this function.
*/
SCpnt->done = rw_intr;
/*
* This indicates that the command is ready from our end to be
* queued.

2
include/scsi/scsi_cmnd.h
View File

@ -33,7 +33,6 @@ struct scsi_cmnd {
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
int eh_eflags; /* Used by error handlr */
void (*done) (struct scsi_cmnd *); /* Mid-level done function */
/*
* A SCSI Command is assigned a nonzero serial_number before passed
@ -121,7 +120,6 @@ extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
struct device *);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);

1
include/scsi/scsi_driver.h
View File

@ -15,6 +15,7 @@ struct scsi_driver {
struct device_driver gendrv;
void (*rescan)(struct device *);
int (*done)(struct scsi_cmnd *);
};
#define to_scsi_driver(drv) \
container_of((drv), struct scsi_driver, gendrv)

13
include/scsi/sd.h
View File

@ -47,19 +47,6 @@ struct scsi_disk {
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
static int sd_revalidate_disk(struct gendisk *disk);
static void sd_rw_intr(struct scsi_cmnd * SCpnt);
static int sd_probe(struct device *);
static int sd_remove(struct device *);
static void sd_shutdown(struct device *dev);
static int sd_suspend(struct device *dev, pm_message_t state);
static int sd_resume(struct device *dev);
static void sd_rescan(struct device *);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
static void scsi_disk_release(struct class_device *cdev);
static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
static void sd_print_result(struct scsi_disk *, int);
#define sd_printk(prefix, sdsk, fmt, a...) \
(sdsk)->disk ? \
sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \