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ll_rw_blk: temporarily enable max_segments tweaking 

Expose this setting for now, so that users can play with enabling
large commands without defaulting it to on globally. This is a debug
patch, it will be dropped for the final versions.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-05-10 13:29:51 +02:00
parent 70eb8040dc
commit 563063a808
1 changed files with 23 additions and 0 deletions
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23
block/ll_rw_blk.c
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@ -4072,7 +4072,23 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
return queue_var_show(max_hw_sectors_kb, (page));
}
static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
{
return queue_var_show(q->max_phys_segments, page);
}
static ssize_t queue_max_segments_store(struct request_queue *q,
const char *page, size_t count)
{
unsigned long segments;
ssize_t ret = queue_var_store(&segments, page, count);
spin_lock_irq(q->queue_lock);
q->max_phys_segments = segments;
spin_unlock_irq(q->queue_lock);
return ret;
}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.show = queue_requests_show,
@ -4096,6 +4112,12 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
.show = queue_max_hw_sectors_show,
};
static struct queue_sysfs_entry queue_max_segments_entry = {
.attr = {.name = "max_segments", .mode = S_IRUGO | S_IWUSR },
.show = queue_max_segments_show,
.store = queue_max_segments_store,
};
static struct queue_sysfs_entry queue_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@ -4107,6 +4129,7 @@ static struct attribute *default_attrs[] = {
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
&queue_max_segments_entry.attr,
&queue_iosched_entry.attr,
NULL,
};