[PATCH RFC 25/27] 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) <brau...@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