Commit 39699037 authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

[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: default avatarPavel Emelyanov <xemul@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 59e90b2d

fs/seq_file.c

+33 −0
Original line number Diff line number Diff line
@@ -429,6 +429,39 @@ int seq_release_private(struct inode *inode, struct file *file) 
}

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) {

include/linux/seq_file.h

+2 −0
Original line number Diff line number Diff line
@@ -46,6 +46,8 @@ int seq_path(struct seq_file *, struct vfsmount *, struct dentry *, char *); 


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)