[PATCH RFC 06/27] nfsd: let procfs own the seq_file of /proc/fs/nfs/exports

[Christian Brauner]

Declare the seq_operations and let procfs open and free the seq_file.
->proc_open() and ->proc_release() only set up ->private and take and
drop the reference to the network namespace now. Reading the file then
no longer holds up its removal.

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

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f8ce3c0fb077..5b2782f9dbbd 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1407,16 +1407,23 @@ MODULE_ALIAS_FS("nfsd");
 
 #ifdef CONFIG_PROC_FS
 
+/* procfs opens the seq_file */
 static int exports_proc_open(struct inode *inode, struct file *file)
 {
-	return exports_net_open(current->nsproxy->net_ns, file);
+	exports_net_init(current->nsproxy->net_ns, file->private_data);
+	return 0;
+}
+
+static int exports_proc_release(struct inode *inode, struct file *file)
+{
+	exports_net_put(file->private_data);
+	return 0;
 }
 
 static const struct proc_ops exports_proc_ops = {
+	.proc_seq_ops	= &nfs_exports_op,
 	.proc_open	= exports_proc_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= exports_release,
+	.proc_release	= exports_proc_release,
 };
 
 static int create_proc_exports_entry(void)

-- 
2.53.0