[PATCH RFC 06/23] md: let procfs own the seq_file of /proc/mdstat

[Christian Brauner]

Declare the seq_operations and let procfs open and free the seq_file.
->proc_open() only records the event count for ->proc_poll() now.

Signed-off-by: Christian Brauner (Amutable) <brauner at kernel.org>
---
 drivers/md/md.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 680b34a63cb3..e642b763ebc2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9141,18 +9141,13 @@ static const struct seq_operations md_seq_ops = {
 	.show   = md_seq_show,
 };
 
+/* procfs opens the seq_file */
 static int md_seq_open(struct inode *inode, struct file *file)
 {
-	struct seq_file *seq;
-	int error;
-
-	error = seq_open(file, &md_seq_ops);
-	if (error)
-		return error;
+	struct seq_file *seq = file->private_data;
 
-	seq = file->private_data;
 	seq->poll_event = atomic_read(&md_event_count);
-	return error;
+	return 0;
 }
 
 static int md_unloading;
@@ -9174,10 +9169,8 @@ static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
 }
 
 static const struct proc_ops mdstat_proc_ops = {
+	.proc_seq_ops	= &md_seq_ops,
 	.proc_open	= md_seq_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= seq_release,
 	.proc_poll	= mdstat_poll,
 };
 

-- 
2.53.0