atm: switch to proc_create_seq_private

And remove proc boilerplate code.
Signed-off-by: Christoph Hellwig <hch@lst.de>

net/atm/proc.c

@@ -68,7 +68,6 @@ static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
 struct vcc_state {
 	int bucket;
 	struct sock *sk;
-	int family;
 };
 
 static inline int compare_family(struct sock *sk, int family)
@@ -106,23 +105,13 @@ static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
 	return (l < 0);
 }
 
-static inline void *vcc_walk(struct vcc_state *state, loff_t l)
+static inline void *vcc_walk(struct seq_file *seq, loff_t l)
 {
-	return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
-	       state : NULL;
-}
-
-static int __vcc_seq_open(struct inode *inode, struct file *file,
-	int family, const struct seq_operations *ops)
-{
-	struct vcc_state *state;
-
-	state = __seq_open_private(file, ops, sizeof(*state));
-	if (state == NULL)
-		return -ENOMEM;
+	struct vcc_state *state = seq->private;
+	int family = (uintptr_t)(PDE_DATA(file_inode(seq->file)));
 
-	state->family = family;
-	return 0;
+	return __vcc_walk(&state->sk, family, &state->bucket, l) ?
+	       state : NULL;
 }
 
 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
@@ -133,7 +122,7 @@ static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
 
 	read_lock(&vcc_sklist_lock);
 	state->sk = SEQ_START_TOKEN;
-	return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
+	return left ? vcc_walk(seq, left) : SEQ_START_TOKEN;
 }
 
 static void vcc_seq_stop(struct seq_file *seq, void *v)
@@ -144,9 +133,7 @@ static void vcc_seq_stop(struct seq_file *seq, void *v)
 
 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-	struct vcc_state *state = seq->private;
-
-	v = vcc_walk(state, 1);
+	v = vcc_walk(seq, 1);
 	*pos += !!PTR_ERR(v);
 	return v;
 }
@@ -280,18 +267,6 @@ static const struct seq_operations pvc_seq_ops = {
 	.show	= pvc_seq_show,
 };
 
-static int pvc_seq_open(struct inode *inode, struct file *file)
-{
-	return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
-}
-
-static const struct file_operations pvc_seq_fops = {
-	.open		= pvc_seq_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release_private,
-};
-
 static int vcc_seq_show(struct seq_file *seq, void *v)
 {
 	if (v == SEQ_START_TOKEN) {
@@ -314,18 +289,6 @@ static const struct seq_operations vcc_seq_ops = {
 	.show	= vcc_seq_show,
 };
 
-static int vcc_seq_open(struct inode *inode, struct file *file)
-{
-	return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
-}
-
-static const struct file_operations vcc_seq_fops = {
-	.open		= vcc_seq_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release_private,
-};
-
 static int svc_seq_show(struct seq_file *seq, void *v)
 {
 	static const char atm_svc_banner[] =
@@ -349,18 +312,6 @@ static const struct seq_operations svc_seq_ops = {
 	.show	= svc_seq_show,
 };
 
-static int svc_seq_open(struct inode *inode, struct file *file)
-{
-	return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
-}
-
-static const struct file_operations svc_seq_fops = {
-	.open		= svc_seq_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release_private,
-};
-
 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 				 size_t count, loff_t *pos)
 {
@@ -434,9 +385,12 @@ int __init atm_proc_init(void)
 	if (!atm_proc_root)
 		return -ENOMEM;
 	proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops);
-	proc_create("pvc", 0444, atm_proc_root, &pvc_seq_fops);
-	proc_create("svc", 0444, atm_proc_root, &svc_seq_fops);
-	proc_create("vc", 0444, atm_proc_root, &vcc_seq_fops);
+	proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops,
+			sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC);
+	proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops,
+			sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC);
+	proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops,
+			sizeof(struct vcc_state), NULL);
 	return 0;
 }