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authorNiklas Cassel <niklas.cassel@wdc.com>2020-07-14 23:18:23 +0200
committerJens Axboe <axboe@kernel.dk>2020-07-15 14:26:11 -0600
commite15864f8ea05b24071b07300459ae7e511d0b938 (patch)
treec1c7d77dc70542e0fbfba3694d309f0c18bfc8fd /block/blk-sysfs.c
parentb1d37e5b9602c018c4e236ab2e2c59ce6b088e25 (diff)
downloadlwn-e15864f8ea05b24071b07300459ae7e511d0b938.tar.gz
lwn-e15864f8ea05b24071b07300459ae7e511d0b938.zip
block: add max_open_zones to blk-sysfs
Add a new max_open_zones definition in the sysfs documentation. This definition will be common for all devices utilizing the zoned block device support in the kernel. Export max open zones according to this new definition for NVMe Zoned Namespace devices, ZAC ATA devices (which are treated as SCSI devices by the kernel), and ZBC SCSI devices. Add the new max_open_zones member to struct request_queue, rather than as a queue limit, since this property cannot be split across stacking drivers. Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Reviewed-by: Javier González <javier@javigon.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r--block/blk-sysfs.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index be67952e7be2..414f04579d77 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -306,6 +306,11 @@ static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
return queue_var_show(blk_queue_nr_zones(q), page);
}
+static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(queue_max_open_zones(q), page);
+}
+
static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
{
return queue_var_show((blk_queue_nomerges(q) << 1) |
@@ -668,6 +673,11 @@ static struct queue_sysfs_entry queue_nr_zones_entry = {
.show = queue_nr_zones_show,
};
+static struct queue_sysfs_entry queue_max_open_zones_entry = {
+ .attr = {.name = "max_open_zones", .mode = 0444 },
+ .show = queue_max_open_zones_show,
+};
+
static struct queue_sysfs_entry queue_nomerges_entry = {
.attr = {.name = "nomerges", .mode = 0644 },
.show = queue_nomerges_show,
@@ -766,6 +776,7 @@ static struct attribute *queue_attrs[] = {
&queue_nonrot_entry.attr,
&queue_zoned_entry.attr,
&queue_nr_zones_entry.attr,
+ &queue_max_open_zones_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,
@@ -793,6 +804,10 @@ static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
(!q->mq_ops || !q->mq_ops->timeout))
return 0;
+ if (attr == &queue_max_open_zones_entry.attr &&
+ !blk_queue_is_zoned(q))
+ return 0;
+
return attr->mode;
}