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virtio-blk: modernize sysfs attribute creation 

Use new-style DEVICE_ATTR_RO/DEVICE_ATTR_RW to create the sysfs attributes
and register the disk with default sysfs attribute groups.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hannes Reinecke 2018-09-28 08:17:23 +02:00 committed by Jens Axboe
parent 98af4d4df8
commit e982c4d0a2
1 changed files with 39 additions and 29 deletions
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68
drivers/block/virtio_blk.c
View File

@ -351,8 +351,8 @@ static int minor_to_index(int minor)
return minor >> PART_BITS;
}
static ssize_t virtblk_serial_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t serial_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
int err;
@ -371,7 +371,7 @@ static ssize_t virtblk_serial_show(struct device *dev,
return err;
}
static DEVICE_ATTR(serial, 0444, virtblk_serial_show, NULL);
static DEVICE_ATTR_RO(serial);
/* The queue's logical block size must be set before calling this */
static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize)
@ -545,8 +545,8 @@ static const char *const virtblk_cache_types[] = {
};
static ssize_t
virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
cache_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct gendisk *disk = dev_to_disk(dev);
struct virtio_blk *vblk = disk->private_data;
@ -564,8 +564,7 @@ virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
}
static ssize_t
virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
char *buf)
cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
struct virtio_blk *vblk = disk->private_data;
@ -575,12 +574,38 @@ virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
}
static const struct device_attribute dev_attr_cache_type_ro =
__ATTR(cache_type, 0444,
virtblk_cache_type_show, NULL);
static const struct device_attribute dev_attr_cache_type_rw =
__ATTR(cache_type, 0644,
virtblk_cache_type_show, virtblk_cache_type_store);
static DEVICE_ATTR_RW(cache_type);
static struct attribute *virtblk_attrs[] = {
&dev_attr_serial.attr,
&dev_attr_cache_type.attr,
NULL,
};
static umode_t virtblk_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct gendisk *disk = dev_to_disk(dev);
struct virtio_blk *vblk = disk->private_data;
struct virtio_device *vdev = vblk->vdev;
if (a == &dev_attr_cache_type.attr &&
!virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
return S_IRUGO;
return a->mode;
}
static const struct attribute_group virtblk_attr_group = {
.attrs = virtblk_attrs,
.is_visible = virtblk_attrs_are_visible,
};
static const struct attribute_group *virtblk_attr_groups[] = {
&virtblk_attr_group,
NULL,
};
static int virtblk_init_request(struct blk_mq_tag_set *set, struct request *rq,
unsigned int hctx_idx, unsigned int numa_node)
@ -780,24 +805,9 @@ static int virtblk_probe(struct virtio_device *vdev)
virtblk_update_capacity(vblk, false);
virtio_device_ready(vdev);
device_add_disk(&vdev->dev, vblk->disk, NULL);
err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
if (err)
goto out_del_disk;
if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
err = device_create_file(disk_to_dev(vblk->disk),
&dev_attr_cache_type_rw);
else
err = device_create_file(disk_to_dev(vblk->disk),
&dev_attr_cache_type_ro);
if (err)
goto out_del_disk;
device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);
return 0;
out_del_disk:
del_gendisk(vblk->disk);
blk_cleanup_queue(vblk->disk->queue);
out_free_tags:
blk_mq_free_tag_set(&vblk->tag_set);
out_put_disk: