[net-next-2.6.git] / fs / nilfs2 / sufile.h

/*
 * sufile.h - NILFS segment usage file.
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Koji Sato <koji@osrg.net>.
 */

#ifndef _NILFS_SUFILE_H
#define _NILFS_SUFILE_H

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/nilfs2_fs.h>
#include "mdt.h"

#define NILFS_SUFILE_GFP	NILFS_MDT_GFP

static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
{
	return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
}

int nilfs_sufile_alloc(struct inode *, __u64 *);
int nilfs_sufile_get_segment_usage(struct inode *, __u64,
				   struct nilfs_segment_usage **,
				   struct buffer_head **);
void nilfs_sufile_put_segment_usage(struct inode *, __u64,
				    struct buffer_head *);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *,
				size_t);

int nilfs_sufile_update(struct inode *, __u64, int,
			void (*dofunc)(struct inode *, __u64,
				       struct buffer_head *,
				       struct buffer_head *));
void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
				 struct buffer_head *);
void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
			  struct buffer_head *);
void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
			       struct buffer_head *);

/**
 * nilfs_sufile_cancel_free -
 * @sufile: inode of segment usage file
 * @segnum: segment number
 *
 * Description:
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 */
static inline int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
{
	return nilfs_sufile_update(sufile, segnum, 0,
				   nilfs_sufile_do_cancel_free);
}

/**
 * nilfs_sufile_free - free segment
 * @sufile: inode of segment usage file
 * @segnum: segment number to be freed
 */
static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
{
	return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
}

/**
 * nilfs_sufile_set_error - mark a segment as erroneous
 * @sufile: inode of segment usage file
 * @segnum: segment number
 *
 * Description: nilfs_sufile_set_error() marks the segment specified by
 * @segnum as erroneous. The error segment will never be used again.
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-EINVAL - Invalid segment usage number.
 */
static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
{
	return nilfs_sufile_update(sufile, segnum, 0,
				   nilfs_sufile_do_set_error);
}

#endif	/* _NILFS_SUFILE_H */
Commit	Line	Data
6c98cd4e KS	1	/*
	2	* sufile.h - NILFS segment usage file.
	3	*
	4	* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Written by Koji Sato <koji@osrg.net>.
	21	*/
	22
	23	#ifndef _NILFS_SUFILE_H
	24	#define _NILFS_SUFILE_H
	25
	26	#include <linux/fs.h>
	27	#include <linux/buffer_head.h>
	28	#include <linux/nilfs2_fs.h>
	29	#include "mdt.h"
	30
	31	#define NILFS_SUFILE_GFP NILFS_MDT_GFP
	32
	33	static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
	34	{
	35	return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
	36	}
	37
	38	int nilfs_sufile_alloc(struct inode , __u64 );
6c98cd4e KS	39	int nilfs_sufile_get_segment_usage(struct inode *, __u64,
	40	struct nilfs_segment_usage **,
	41	struct buffer_head **);
	42	void nilfs_sufile_put_segment_usage(struct inode *, __u64,
	43	struct buffer_head *);
	44	int nilfs_sufile_get_stat(struct inode , struct nilfs_sustat );
	45	int nilfs_sufile_get_ncleansegs(struct inode , unsigned long );
6c98cd4e KS	46	ssize_t nilfs_sufile_get_suinfo(struct inode , __u64, struct nilfs_suinfo ,
	47	size_t);
	48
a703018f RK	49	int nilfs_sufile_update(struct inode *, __u64, int,
	50	void (dofunc)(struct inode , __u64,
	51	struct buffer_head *,
	52	struct buffer_head *));
	53	void nilfs_sufile_do_cancel_free(struct inode , __u64, struct buffer_head ,
	54	struct buffer_head *);
	55	void nilfs_sufile_do_free(struct inode , __u64, struct buffer_head ,
	56	struct buffer_head *);
	57	void nilfs_sufile_do_set_error(struct inode , __u64, struct buffer_head ,
	58	struct buffer_head *);
	59
	60	/**
	61	* nilfs_sufile_cancel_free -
	62	* @sufile: inode of segment usage file
	63	* @segnum: segment number
	64	*
	65	* Description:
	66	*
	67	* Return Value: On success, 0 is returned. On error, one of the following
	68	* negative error codes is returned.
	69	*
	70	* %-EIO - I/O error.
	71	*
	72	* %-ENOMEM - Insufficient amount of memory available.
	73	*/
	74	static inline int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
	75	{
	76	return nilfs_sufile_update(sufile, segnum, 0,
	77	nilfs_sufile_do_cancel_free);
	78	}
	79
	80	/**
	81	* nilfs_sufile_free - free segment
	82	* @sufile: inode of segment usage file
	83	* @segnum: segment number to be freed
	84	*/
	85	static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
	86	{
	87	return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
	88	}
	89
	90	/**
	91	* nilfs_sufile_set_error - mark a segment as erroneous
	92	* @sufile: inode of segment usage file
	93	* @segnum: segment number
	94	*
	95	* Description: nilfs_sufile_set_error() marks the segment specified by
	96	* @segnum as erroneous. The error segment will never be used again.
	97	*
	98	* Return Value: On success, 0 is returned. On error, one of the following
	99	* negative error codes is returned.
	100	*
	101	* %-EIO - I/O error.
	102	*
	103	* %-ENOMEM - Insufficient amount of memory available.
	104	*
	105	* %-EINVAL - Invalid segment usage number.
	106	*/
	107	static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
	108	{
	109	return nilfs_sufile_update(sufile, segnum, 0,
	110	nilfs_sufile_do_set_error);
	111	}
6c98cd4e KS	112
6c98cd4e KS	113	#endif /* _NILFS_SUFILE_H */