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[BLOCK] update SCSI to use new blk_ordered for barriers 

All ordered request related stuff delegated to HLD.  Midlayer
now doens't deal with ordered setting or prepare_flush
callback.  sd.c updated to deal with blk_queue_ordered
setting.  Currently, ordered tag isn't used as SCSI midlayer
cannot guarantee request ordering.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Tejun Heo 2006-01-06 09:52:55 +01:00 committed by Jens Axboe
parent 797e7dbbee
commit 461d4e90c8
5 changed files with 20 additions and 95 deletions
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9
drivers/scsi/hosts.c
View File

@ -347,17 +347,8 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost->cmd_per_lun = sht->cmd_per_lun;
shost->unchecked_isa_dma = sht->unchecked_isa_dma;
shost->use_clustering = sht->use_clustering;
shost->ordered_flush = sht->ordered_flush;
shost->ordered_tag = sht->ordered_tag;
/*
* hosts/devices that do queueing must support ordered tags
*/
if (shost->can_queue > 1 && shost->ordered_flush) {
printk(KERN_ERR "scsi: ordered flushes don't support queueing\n");
shost->ordered_flush = 0;
}
if (sht->max_host_blocked)
shost->max_host_blocked = sht->max_host_blocked;
else

46
drivers/scsi/scsi_lib.c
View File

@ -932,9 +932,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes,
int sense_valid = 0;
int sense_deferred = 0;
if (blk_complete_barrier_rq(q, req, good_bytes >> 9))
return;
/*
* Free up any indirection buffers we allocated for DMA purposes.
* For the case of a READ, we need to copy the data out of the
@ -1199,38 +1196,6 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
return BLKPREP_KILL;
}
static int scsi_prepare_flush_fn(request_queue_t *q, struct request *rq)
{
struct scsi_device *sdev = q->queuedata;
struct scsi_driver *drv;
if (sdev->sdev_state == SDEV_RUNNING) {
drv = *(struct scsi_driver **) rq->rq_disk->private_data;
if (drv->prepare_flush)
return drv->prepare_flush(q, rq);
}
return 0;
}
static void scsi_end_flush_fn(request_queue_t *q, struct request *rq)
{
struct scsi_device *sdev = q->queuedata;
struct request *flush_rq = rq->end_io_data;
struct scsi_driver *drv;
if (flush_rq->errors) {
printk("scsi: barrier error, disabling flush support\n");
blk_queue_ordered(q, QUEUE_ORDERED_NONE);
}
if (sdev->sdev_state == SDEV_RUNNING) {
drv = *(struct scsi_driver **) rq->rq_disk->private_data;
drv->end_flush(q, rq);
}
}
static int scsi_issue_flush_fn(request_queue_t *q, struct gendisk *disk,
sector_t *error_sector)
{
@ -1703,17 +1668,6 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
blk_queue_segment_boundary(q, shost->dma_boundary);
blk_queue_issue_flush_fn(q, scsi_issue_flush_fn);
/*
* ordered tags are superior to flush ordering
*/
if (shost->ordered_tag)
blk_queue_ordered(q, QUEUE_ORDERED_TAG);
else if (shost->ordered_flush) {
blk_queue_ordered(q, QUEUE_ORDERED_FLUSH);
q->prepare_flush_fn = scsi_prepare_flush_fn;
q->end_flush_fn = scsi_end_flush_fn;
}
if (!shost->use_clustering)
clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
return q;

56
drivers/scsi/sd.c
View File

@ -121,8 +121,7 @@ static void sd_shutdown(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_end_flush(request_queue_t *, struct request *);
static int sd_prepare_flush(request_queue_t *, struct request *);
static void sd_prepare_flush(request_queue_t *, struct request *);
static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
unsigned char *buffer);
@ -137,8 +136,6 @@ static struct scsi_driver sd_template = {
.rescan = sd_rescan,
.init_command = sd_init_command,
.issue_flush = sd_issue_flush,
.prepare_flush = sd_prepare_flush,
.end_flush = sd_end_flush,
};
/*
@ -729,42 +726,13 @@ static int sd_issue_flush(struct device *dev, sector_t *error_sector)
return ret;
}
static void sd_end_flush(request_queue_t *q, struct request *flush_rq)
static void sd_prepare_flush(request_queue_t *q, struct request *rq)
{
struct request *rq = flush_rq->end_io_data;
struct scsi_cmnd *cmd = rq->special;
unsigned int bytes = rq->hard_nr_sectors << 9;
if (!flush_rq->errors) {
spin_unlock(q->queue_lock);
scsi_io_completion(cmd, bytes, 0);
spin_lock(q->queue_lock);
} else if (blk_barrier_postflush(rq)) {
spin_unlock(q->queue_lock);
scsi_io_completion(cmd, 0, bytes);
spin_lock(q->queue_lock);
} else {
/*
* force journal abort of barriers
*/
end_that_request_first(rq, -EOPNOTSUPP, rq->hard_nr_sectors);
end_that_request_last(rq, -EOPNOTSUPP);
}
}
static int sd_prepare_flush(request_queue_t *q, struct request *rq)
{
struct scsi_device *sdev = q->queuedata;
struct scsi_disk *sdkp = dev_get_drvdata(&sdev->sdev_gendev);
if (!sdkp || !sdkp->WCE)
return 0;
memset(rq->cmd, 0, sizeof(rq->cmd));
rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER;
rq->flags |= REQ_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
rq->cmd[0] = SYNCHRONIZE_CACHE;
return 1;
rq->cmd_len = 10;
}
static void sd_rescan(struct device *dev)
@ -1462,6 +1430,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdp = sdkp->device;
unsigned char *buffer;
unsigned ordered;
SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name));
@ -1499,6 +1468,19 @@ static int sd_revalidate_disk(struct gendisk *disk)
sd_read_cache_type(sdkp, disk->disk_name, buffer);
}
/*
* We now have all cache related info, determine how we deal
* with ordered requests. Note that as the current SCSI
* dispatch function can alter request order, we cannot use
* QUEUE_ORDERED_TAG_* even when ordered tag is supported.
*/
if (sdkp->WCE)
ordered = QUEUE_ORDERED_DRAIN_FLUSH;
else
ordered = QUEUE_ORDERED_DRAIN;
blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
set_capacity(disk, sdkp->capacity);
kfree(buffer);
@ -1598,6 +1580,7 @@ static int sd_probe(struct device *dev)
strcpy(gd->devfs_name, sdp->devfs_name);
gd->private_data = &sdkp->driver;
gd->queue = sdkp->device->request_queue;
sd_revalidate_disk(gd);
@ -1605,7 +1588,6 @@ static int sd_probe(struct device *dev)
gd->flags = GENHD_FL_DRIVERFS;
if (sdp->removable)
gd->flags |= GENHD_FL_REMOVABLE;
gd->queue = sdkp->device->request_queue;
dev_set_drvdata(dev, sdkp);
add_disk(gd);

1
include/scsi/scsi_driver.h
View File

@ -15,7 +15,6 @@ struct scsi_driver {
void (*rescan)(struct device *);
int (*issue_flush)(struct device *, sector_t *);
int (*prepare_flush)(struct request_queue *, struct request *);
void (*end_flush)(struct request_queue *, struct request *);
};
#define to_scsi_driver(drv) \
container_of((drv), struct scsi_driver, gendrv)

1
include/scsi/scsi_host.h
View File

@ -392,7 +392,6 @@ struct scsi_host_template {
/*
* ordered write support
*/
unsigned ordered_flush:1;
unsigned ordered_tag:1;
/*