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authorJames Bottomley <James.Bottomley@steeleye.com>2007-08-03 16:41:11 -0500
committerJames Bottomley <jejb@mulgrave.localdomain>2007-08-04 08:37:04 -0500
commit03a5743a12b58e10eaa936a02498539db645ba4e (patch)
treedd3d80da57e3efd26a60f4d369224b41b7008947
parent66dbfbe6fde35c881deda5cebb6ecaa0dcc1c975 (diff)
downloadop-kernel-dev-03a5743a12b58e10eaa936a02498539db645ba4e.zip
op-kernel-dev-03a5743a12b58e10eaa936a02498539db645ba4e.tar.gz
[SCSI] sd: disentangle barriers in SCSI
Our current implementation has a generic set of barrier functions that go through the SCSI driver model. Realistically, this is unnecessary, because the only device that can use barriers (sd) can set the flush functions up at probe or revalidate time. This patch pulls the barrier functions out of the mid layer and scsi driver model and relocates them directly in sd. Acked-by: Tejun Heo <htejun@gmail.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/scsi_lib.c17
-rw-r--r--drivers/scsi/sd.c14
-rw-r--r--include/scsi/scsi_driver.h2
-rw-r--r--include/scsi/sd.h2
4 files changed, 11 insertions, 24 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 21c075d..a417a6ff 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1038,22 +1038,6 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
return BLKPREP_KILL;
}
-static int scsi_issue_flush_fn(struct request_queue *q, struct gendisk *disk,
- sector_t *error_sector)
-{
- struct scsi_device *sdev = q->queuedata;
- struct scsi_driver *drv;
-
- if (sdev->sdev_state != SDEV_RUNNING)
- return -ENXIO;
-
- drv = *(struct scsi_driver **) disk->private_data;
- if (drv->issue_flush)
- return drv->issue_flush(&sdev->sdev_gendev, error_sector);
-
- return -EOPNOTSUPP;
-}
-
static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
struct request *req)
{
@@ -1596,7 +1580,6 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
return NULL;
blk_queue_prep_rq(q, scsi_prep_fn);
- blk_queue_issue_flush_fn(q, scsi_issue_flush_fn);
blk_queue_softirq_done(q, scsi_softirq_done);
return q;
}
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e21c714..2c6116f 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -241,7 +241,6 @@ static struct scsi_driver sd_template = {
},
.rescan = sd_rescan,
.init_command = sd_init_command,
- .issue_flush = sd_issue_flush,
};
/*
@@ -800,10 +799,17 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
return 0;
}
-static int sd_issue_flush(struct device *dev, sector_t *error_sector)
+static int sd_issue_flush(struct request_queue *q, struct gendisk *disk,
+ sector_t *error_sector)
{
int ret = 0;
- struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
+ struct scsi_device *sdp = q->queuedata;
+ struct scsi_disk *sdkp;
+
+ if (sdp->sdev_state != SDEV_RUNNING)
+ return -ENXIO;
+
+ sdkp = scsi_disk_get_from_dev(&sdp->sdev_gendev);
if (!sdkp)
return -ENODEV;
@@ -1663,6 +1669,8 @@ static int sd_probe(struct device *dev)
sd_revalidate_disk(gd);
+ blk_queue_issue_flush_fn(sdp->request_queue, sd_issue_flush);
+
gd->driverfs_dev = &sdp->sdev_gendev;
gd->flags = GENHD_FL_DRIVERFS;
if (sdp->removable)
diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h
index 02e26c1..3465f31 100644
--- a/include/scsi/scsi_driver.h
+++ b/include/scsi/scsi_driver.h
@@ -13,8 +13,6 @@ struct scsi_driver {
int (*init_command)(struct scsi_cmnd *);
void (*rescan)(struct device *);
- int (*issue_flush)(struct device *, sector_t *);
- int (*prepare_flush)(struct request_queue *, struct request *);
};
#define to_scsi_driver(drv) \
container_of((drv), struct scsi_driver, gendrv)
diff --git a/include/scsi/sd.h b/include/scsi/sd.h
index 78583fe..ce02ad1 100644
--- a/include/scsi/sd.h
+++ b/include/scsi/sd.h
@@ -56,8 +56,6 @@ 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 int sd_init_command(struct scsi_cmnd *);
-static int sd_issue_flush(struct device *, sector_t *);
-static void sd_prepare_flush(struct request_queue *, struct request *);
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 *);
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