zfs/include/os/linux/spl/sys/procfs_list.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2018 by Delphix. All rights reserved.
 */

#ifndef	_SPL_PROCFS_LIST_H
#define	_SPL_PROCFS_LIST_H

#include <sys/kstat.h>
#include <sys/mutex.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

typedef struct procfs_list procfs_list_t;
struct procfs_list {
	/* Accessed only by user of a procfs_list */
	void		*pl_private;

	/*
	 * Accessed both by user of a procfs_list and by procfs_list
	 * implementation
	 */
	kmutex_t	pl_lock;
	list_t		pl_list;

	/* Accessed only by procfs_list implementation */
	uint64_t	pl_next_id;
	int		(*pl_show)(struct seq_file *f, void *p);
	int		(*pl_show_header)(struct seq_file *f);
	int		(*pl_clear)(procfs_list_t *procfs_list);
	size_t		pl_node_offset;
	kstat_proc_entry_t	pl_kstat_entry;
};

typedef struct procfs_list_node {
	list_node_t	pln_link;
	uint64_t	pln_id;
} procfs_list_node_t;

void procfs_list_install(const char *module,
    const char *submodule,
    const char *name,
    mode_t mode,
    procfs_list_t *procfs_list,
    int (*show)(struct seq_file *f, void *p),
    int (*show_header)(struct seq_file *f),
    int (*clear)(procfs_list_t *procfs_list),
    size_t procfs_list_node_off);
void procfs_list_uninstall(procfs_list_t *procfs_list);
void procfs_list_destroy(procfs_list_t *procfs_list);

void procfs_list_add(procfs_list_t *procfs_list, void *p);

#endif	/* _SPL_PROCFS_LIST_H */