[linux.git] / fs / nilfs2 / segbuf.h

/*
 * segbuf.h - NILFS Segment buffer prototypes and definitions
 *
 * Copyright (C) 2005-2008 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 Ryusuke Konishi <[email protected]>
 *
 */
#ifndef _NILFS_SEGBUF_H
#define _NILFS_SEGBUF_H

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/completion.h>

/**
 * struct nilfs_segsum_info - On-memory segment summary
 * @flags: Flags
 * @nfinfo: Number of file information structures
 * @nblocks: Number of blocks included in the partial segment
 * @nsumblk: Number of summary blocks
 * @sumbytes: Byte count of segment summary
 * @nfileblk: Total number of file blocks
 * @seg_seq: Segment sequence number
 * @cno: Checkpoint number
 * @ctime: Creation time
 * @next: Block number of the next full segment
 */
struct nilfs_segsum_info {
	unsigned int		flags;
	unsigned long		nfinfo;
	unsigned long		nblocks;
	unsigned long		nsumblk;
	unsigned long		sumbytes;
	unsigned long		nfileblk;
	u64			seg_seq;
	__u64			cno;
	time_t			ctime;
	sector_t		next;
};

/**
 * struct nilfs_segment_buffer - Segment buffer
 * @sb_super: back pointer to a superblock struct
 * @sb_list: List head to chain this structure
 * @sb_sum: On-memory segment summary
 * @sb_segnum: Index number of the full segment
 * @sb_nextnum: Index number of the next full segment
 * @sb_fseg_start: Start block number of the full segment
 * @sb_fseg_end: End block number of the full segment
 * @sb_pseg_start: Disk block number of partial segment
 * @sb_rest_blocks: Number of residual blocks in the current segment
 * @sb_segsum_buffers: List of buffers for segment summaries
 * @sb_payload_buffers: List of buffers for segment payload
 * @sb_super_root: Pointer to buffer storing a super root block (if exists)
 * @sb_nbio: Number of flying bio requests
 * @sb_err: I/O error status
 * @sb_bio_event: Completion event of log writing
 */
struct nilfs_segment_buffer {
	struct super_block     *sb_super;
	struct list_head	sb_list;

	/* Segment information */
	struct nilfs_segsum_info sb_sum;
	__u64			sb_segnum;
	__u64			sb_nextnum;
	sector_t		sb_fseg_start, sb_fseg_end;
	sector_t		sb_pseg_start;
	unsigned		sb_rest_blocks;

	/* Buffers */
	struct list_head	sb_segsum_buffers;
	struct list_head	sb_payload_buffers; /* including super root */
	struct buffer_head     *sb_super_root;

	/* io status */
	int			sb_nbio;
	atomic_t		sb_err;
	struct completion	sb_bio_event;
};

#define NILFS_LIST_SEGBUF(head)  \
	list_entry((head), struct nilfs_segment_buffer, sb_list)
#define NILFS_NEXT_SEGBUF(segbuf)  NILFS_LIST_SEGBUF((segbuf)->sb_list.next)
#define NILFS_PREV_SEGBUF(segbuf)  NILFS_LIST_SEGBUF((segbuf)->sb_list.prev)
#define NILFS_LAST_SEGBUF(head)    NILFS_LIST_SEGBUF((head)->prev)
#define NILFS_FIRST_SEGBUF(head)   NILFS_LIST_SEGBUF((head)->next)
#define NILFS_SEGBUF_IS_LAST(segbuf, head)  ((segbuf)->sb_list.next == (head))

#define nilfs_for_each_segbuf_before(s, t, h) \
	for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \
	     (s) = NILFS_NEXT_SEGBUF(s))

#define NILFS_SEGBUF_FIRST_BH(head)  \
	(list_entry((head)->next, struct buffer_head, b_assoc_buffers))
#define NILFS_SEGBUF_NEXT_BH(bh)  \
	(list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \
		    b_assoc_buffers))
#define NILFS_SEGBUF_BH_IS_LAST(bh, head)  ((bh)->b_assoc_buffers.next == head)

extern struct kmem_cache *nilfs_segbuf_cachep;

struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
void nilfs_segbuf_free(struct nilfs_segment_buffer *);
void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
		      struct the_nilfs *);
void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
			   struct nilfs_segment_buffer *prev);
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
				  struct the_nilfs *);
int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64);
int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,
				struct buffer_head **);
void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *);

static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf)
{
	unsigned int flags = segbuf->sb_sum.flags;

	return (flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) ==
		(NILFS_SS_LOGBGN | NILFS_SS_LOGEND);
}

static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf)
{
	return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk;
}

static inline void
nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf,
			       struct buffer_head *bh)
{
	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers);
	segbuf->sb_sum.nblocks++;
	segbuf->sb_sum.nsumblk++;
}

static inline void
nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf,
				struct buffer_head *bh)
{
	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers);
	segbuf->sb_sum.nblocks++;
}

static inline void
nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf,
			     struct buffer_head *bh)
{
	get_bh(bh);
	nilfs_segbuf_add_payload_buffer(segbuf, bh);
	segbuf->sb_sum.nfileblk++;
}

void nilfs_clear_logs(struct list_head *logs);
void nilfs_truncate_logs(struct list_head *logs,
			 struct nilfs_segment_buffer *last);
int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs);
int nilfs_wait_on_logs(struct list_head *logs);
void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed);

static inline void nilfs_destroy_logs(struct list_head *logs)
{
	nilfs_truncate_logs(logs, NULL);
}

#endif /* _NILFS_SEGBUF_H */
Commit	Line	Data
64b5a32e RK	1	/*
	2	* segbuf.h - NILFS Segment buffer prototypes and definitions
	3	*
	4	* Copyright (C) 2005-2008 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 Ryusuke Konishi <[email protected]>
	21	*
	22	*/
	23	#ifndef _NILFS_SEGBUF_H
	24	#define _NILFS_SEGBUF_H
	25
	26	#include <linux/fs.h>
	27	#include <linux/buffer_head.h>
	28	#include <linux/bio.h>
	29	#include <linux/completion.h>
64b5a32e RK	30
	31	/**
	32	* struct nilfs_segsum_info - On-memory segment summary
	33	* @flags: Flags
	34	* @nfinfo: Number of file information structures
	35	* @nblocks: Number of blocks included in the partial segment
	36	* @nsumblk: Number of summary blocks
	37	* @sumbytes: Byte count of segment summary
	38	* @nfileblk: Total number of file blocks
	39	* @seg_seq: Segment sequence number
50614bcf	40	* @cno: Checkpoint number
64b5a32e RK	41	* @ctime: Creation time
	42	* @next: Block number of the next full segment
	43	*/
	44	struct nilfs_segsum_info {
	45	unsigned int flags;
	46	unsigned long nfinfo;
	47	unsigned long nblocks;
	48	unsigned long nsumblk;
	49	unsigned long sumbytes;
	50	unsigned long nfileblk;
	51	u64 seg_seq;
50614bcf	52	__u64 cno;
64b5a32e RK	53	time_t ctime;
	54	sector_t next;
	55	};
	56
64b5a32e RK	57	/**
	58	* struct nilfs_segment_buffer - Segment buffer
	59	* @sb_super: back pointer to a superblock struct
	60	* @sb_list: List head to chain this structure
64b5a32e RK	61	* @sb_sum: On-memory segment summary
	62	* @sb_segnum: Index number of the full segment
	63	* @sb_nextnum: Index number of the next full segment
	64	* @sb_fseg_start: Start block number of the full segment
	65	* @sb_fseg_end: End block number of the full segment
	66	* @sb_pseg_start: Disk block number of partial segment
	67	* @sb_rest_blocks: Number of residual blocks in the current segment
	68	* @sb_segsum_buffers: List of buffers for segment summaries
	69	* @sb_payload_buffers: List of buffers for segment payload
1e2b68bf	70	* @sb_super_root: Pointer to buffer storing a super root block (if exists)
9284ad2a RK	71	* @sb_nbio: Number of flying bio requests
	72	* @sb_err: I/O error status
	73	* @sb_bio_event: Completion event of log writing
64b5a32e RK	74	*/
	75	struct nilfs_segment_buffer {
	76	struct super_block *sb_super;
	77	struct list_head sb_list;
64b5a32e RK	78
	79	/* Segment information */
	80	struct nilfs_segsum_info sb_sum;
	81	__u64 sb_segnum;
	82	__u64 sb_nextnum;
	83	sector_t sb_fseg_start, sb_fseg_end;
	84	sector_t sb_pseg_start;
	85	unsigned sb_rest_blocks;
	86
	87	/* Buffers */
	88	struct list_head sb_segsum_buffers;
	89	struct list_head sb_payload_buffers; /* including super root */
1e2b68bf	90	struct buffer_head *sb_super_root;
64b5a32e RK	91
64b5a32e RK	92	/* io status */
9284ad2a RK	93	int sb_nbio;
	94	atomic_t sb_err;
	95	struct completion sb_bio_event;
64b5a32e RK	96	};
	97
	98	#define NILFS_LIST_SEGBUF(head) \
	99	list_entry((head), struct nilfs_segment_buffer, sb_list)
	100	#define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next)
	101	#define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev)
	102	#define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev)
	103	#define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next)
	104	#define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head))
	105
	106	#define nilfs_for_each_segbuf_before(s, t, h) \
	107	for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \
	108	(s) = NILFS_NEXT_SEGBUF(s))
	109
	110	#define NILFS_SEGBUF_FIRST_BH(head) \
	111	(list_entry((head)->next, struct buffer_head, b_assoc_buffers))
	112	#define NILFS_SEGBUF_NEXT_BH(bh) \
	113	(list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \
	114	b_assoc_buffers))
	115	#define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head)
	116
41c88bd7	117	extern struct kmem_cache *nilfs_segbuf_cachep;
64b5a32e	118
64b5a32e RK	119	struct nilfs_segment_buffer nilfs_segbuf_new(struct super_block );
64b5a32e RK	120	void nilfs_segbuf_free(struct nilfs_segment_buffer *);
cece5520 RK	121	void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
cece5520 RK	122	struct the_nilfs *);
a694291a RK	123	void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
a694291a RK	124	struct nilfs_segment_buffer *prev);
64b5a32e RK	125	void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
64b5a32e RK	126	struct the_nilfs *);
50614bcf	127	int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64);
64b5a32e RK	128	int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
	129	int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,
	130	struct buffer_head **);
	131	void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *);
64b5a32e	132
4762077c RK	133	static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf)
	134	{
	135	unsigned int flags = segbuf->sb_sum.flags;
	136
	137	return (flags & (NILFS_SS_LOGBGN \| NILFS_SS_LOGEND)) ==
	138	(NILFS_SS_LOGBGN \| NILFS_SS_LOGEND);
	139	}
	140
	141	static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf)
	142	{
	143	return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk;
	144	}
	145
64b5a32e RK	146	static inline void
	147	nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf,
	148	struct buffer_head *bh)
	149	{
	150	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers);
	151	segbuf->sb_sum.nblocks++;
	152	segbuf->sb_sum.nsumblk++;
	153	}
	154
	155	static inline void
	156	nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf,
	157	struct buffer_head *bh)
	158	{
	159	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers);
	160	segbuf->sb_sum.nblocks++;
	161	}
	162
	163	static inline void
	164	nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf,
	165	struct buffer_head *bh)
	166	{
	167	get_bh(bh);
	168	nilfs_segbuf_add_payload_buffer(segbuf, bh);
	169	segbuf->sb_sum.nfileblk++;
	170	}
	171
e29df395 RK	172	void nilfs_clear_logs(struct list_head *logs);
	173	void nilfs_truncate_logs(struct list_head *logs,
	174	struct nilfs_segment_buffer *last);
d1c6b72a	175	int nilfs_write_logs(struct list_head logs, struct the_nilfs nilfs);
e29df395	176	int nilfs_wait_on_logs(struct list_head *logs);
aaed1d5b	177	void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed);
e29df395 RK	178
	179	static inline void nilfs_destroy_logs(struct list_head *logs)
	180	{
	181	nilfs_truncate_logs(logs, NULL);
	182	}
	183
64b5a32e	184	#endif /* _NILFS_SEGBUF_H */