[PATCH RESEND v2 27/30] mm/swapfile: let procfs own the seq_file of /proc/swaps

[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>
---
 mm/swapfile.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 254ce86fa923..ee4868ecc3a7 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3410,26 +3410,19 @@ static const struct seq_operations swaps_op = {
 	.show =		swap_show
 };
 
+/* procfs opens the seq_file */
 static int swaps_open(struct inode *inode, struct file *file)
 {
-	struct seq_file *seq;
-	int ret;
-
-	ret = seq_open(file, &swaps_op);
-	if (ret)
-		return ret;
+	struct seq_file *seq = file->private_data;
 
-	seq = file->private_data;
 	seq->poll_event = atomic_read(&proc_poll_event);
 	return 0;
 }
 
 static const struct proc_ops swaps_proc_ops = {
 	.proc_flags	= PROC_ENTRY_PERMANENT,
+	.proc_seq_ops	= &swaps_op,
 	.proc_open	= swaps_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= seq_release,
 	.proc_poll	= swaps_poll,
 };
 

-- 
2.53.0