[FS] seq_file: Introduce the seq_open_private()

This function allocates the zeroed chunk of memory and call seq_open(). The __seq_open_private() helper returns the allocated memory to make it possible for the caller to initialize it. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>

[FS] seq_file: Introduce the seq_open_private()
This function allocates the zeroed chunk of memory and call seq_open(). The __seq_open_private() helper returns the allocated memory to make it possible for the caller to initialize it. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Pavel Emelyanov · David S. Miller · Eric Lee · Eric Lee · Eric Lee · Eric Lee
1 parent 59e90b2d22
Showing 2 changed files with 35 additions and 0 deletions Side-by-side Diff
fs/seq_file.c
include/linux/seq_file.h
@@ -429,6 +429,39 @@
 }
 EXPORT_SYMBOL(seq_release_private);
  
+void *__seq_open_private(struct file *f, const struct seq_operations *ops,
+		int psize)
+{
+	int rc;
+	void *private;
+	struct seq_file *seq;
+
+	private = kzalloc(psize, GFP_KERNEL);
+	if (private == NULL)
+		goto out;
+
+	rc = seq_open(f, ops);
+	if (rc < 0)
+		goto out_free;
+
+	seq = f->private_data;
+	seq->private = private;
+	return private;
+
+out_free:
+	kfree(private);
+out:
+	return NULL;
+}
+EXPORT_SYMBOL(__seq_open_private);
+
+int seq_open_private(struct file *filp, const struct seq_operations *ops,
+		int psize)
+{
+	return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL(seq_open_private);
+
 int seq_putc(struct seq_file *m, char c)
 {
 	if (m->count < m->size) {
@@ -46,6 +46,8 @@
  
 int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
 int single_release(struct inode *, struct file *);
+void *__seq_open_private(struct file *, const struct seq_operations *, int);
+int seq_open_private(struct file *, const struct seq_operations *, int);
 int seq_release_private(struct inode *, struct file *);
  
 #define SEQ_START_TOKEN ((void *)1)
...	...	@@ -429,6 +429,39 @@
429	429	}
430	430	EXPORT_SYMBOL(seq_release_private);
431	431
	432	+void __seq_open_private(struct file f, const struct seq_operations *ops,
	433	+ int psize)
	434	+{
	435	+ int rc;
	436	+ void *private;
	437	+ struct seq_file *seq;
	438	+
	439	+ private = kzalloc(psize, GFP_KERNEL);
	440	+ if (private == NULL)
	441	+ goto out;
	442	+
	443	+ rc = seq_open(f, ops);
	444	+ if (rc < 0)
	445	+ goto out_free;
	446	+
	447	+ seq = f->private_data;
	448	+ seq->private = private;
	449	+ return private;
	450	+
	451	+out_free:
	452	+ kfree(private);
	453	+out:
	454	+ return NULL;
	455	+}
	456	+EXPORT_SYMBOL(__seq_open_private);
	457	+
	458	+int seq_open_private(struct file filp, const struct seq_operations ops,
	459	+ int psize)
	460	+{
	461	+ return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
	462	+}
	463	+EXPORT_SYMBOL(seq_open_private);
	464	+
432	465	int seq_putc(struct seq_file *m, char c)
433	466	{
434	467	if (m->count < m->size) {
...	...	@@ -46,6 +46,8 @@
46	46
47	47	int single_open(struct file , int ()(struct seq_file , void ), void *);
48	48	int single_release(struct inode , struct file );
	49	+void __seq_open_private(struct file , const struct seq_operations *, int);
	50	+int seq_open_private(struct file , const struct seq_operations , int);
49	51	int seq_release_private(struct inode , struct file );
50	52
51	53	#define SEQ_START_TOKEN ((void *)1)