[PATCH -next v2] block: aoe: Convert to DEFINE_SHOW_ATTRIBUTE

[Qinglang Miao]

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.

Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
---
v2: based on linux-next(20200917), and can be applied to
    mainline cleanly now.

 drivers/block/aoe/aoeblk.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 5ca7216e9..3502a8325 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -110,7 +110,7 @@ static ssize_t aoedisk_show_payload(struct device *dev,
        return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
 }
 
-static int aoedisk_debugfs_show(struct seq_file *s, void *ignored)
+static int aoe_debugfs_show(struct seq_file *s, void *ignored)
 {
        struct aoedev *d;
        struct aoetgt **t, **te;
@@ -154,10 +154,7 @@ static int aoedisk_debugfs_show(struct seq_file *s, void 
*ignored)
        return 0;
 }
 
-static int aoe_debugfs_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, aoedisk_debugfs_show, inode->i_private);
-}
+DEFINE_SHOW_ATTRIBUTE(aoe_debugfs);
 
 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
@@ -186,13 +183,6 @@ static const struct attribute_group *aoe_attr_groups[] = {
        NULL,
 };
 
-static const struct file_operations aoe_debugfs_fops = {
-       .open = aoe_debugfs_open,
-       .read = seq_read,
-       .llseek = seq_lseek,
-       .release = single_release,
-};
-
 static void
 aoedisk_add_debugfs(struct aoedev *d)
 {
-- 
2.23.0