backport-include/linux/seq_file.h

#ifndef __BACKPORT_SEQ_FILE_H
#define __BACKPORT_SEQ_FILE_H
#include_next <linux/seq_file.h>
#include <linux/version.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
#include <linux/user_namespace.h>
#include <linux/file.h>
#include <linux/fs.h>
#ifdef CONFIG_USER_NS
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,38)
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
	struct file *f = container_of((void *) seq, struct file, private_data);

	return f->f_cred->user_ns;
}
#else
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
	return current_user_ns();
}
#endif /* (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,38)) */

#else
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
	extern struct user_namespace init_user_ns;
	return &init_user_ns;
}
#endif /* CONFIG_USER_NS */
#endif /* < 3.7 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
#define seq_hlist_start_head LINUX_BACKPORT(seq_hlist_start_head)
extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
					       loff_t pos);

#define seq_hlist_next LINUX_BACKPORT(seq_hlist_next)
extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
					 loff_t *ppos);
#endif

#endif /* __BACKPORT_SEQ_FILE_H */