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block: expose QUEUE_FLAG_DAX in sysfs 

Provides the ability to identify DAX enabled devices in userspace.

Signed-off-by: Yigal Korman <yigal@plexistor.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Yigal Korman 2016-06-23 17:05:51 -04:00 committed by Jens Axboe
parent 163d4baaeb
commit ea6ca600eb
1 changed files with 11 additions and 0 deletions
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11
block/blk-sysfs.c
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@ -379,6 +379,11 @@ static ssize_t queue_wc_store(struct request_queue *q, const char *page,
return count;
}
static ssize_t queue_dax_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_dax(q), page);
}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.show = queue_requests_show,
@ -516,6 +521,11 @@ static struct queue_sysfs_entry queue_wc_entry = {
.store = queue_wc_store,
};
static struct queue_sysfs_entry queue_dax_entry = {
.attr = {.name = "dax", .mode = S_IRUGO },
.show = queue_dax_show,
};
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
@ -542,6 +552,7 @@ static struct attribute *default_attrs[] = {
&queue_random_entry.attr,
&queue_poll_entry.attr,
&queue_wc_entry.attr,
&queue_dax_entry.attr,
NULL,
};