forked from luck/tmp_suning_uos_patched
64b5a32e0b
This adds the segment buffer which is used to constuct logs. [akpm@linux-foundation.org: BIO_RW_SYNC got removed] Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
204 lines
6.7 KiB
C
204 lines
6.7 KiB
C
/*
|
|
* 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 <ryusuke@osrg.net>
|
|
*
|
|
*/
|
|
#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>
|
|
#include <linux/backing-dev.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
|
|
* @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;
|
|
time_t ctime;
|
|
sector_t next;
|
|
};
|
|
|
|
/* macro for the flags */
|
|
#define NILFS_SEG_HAS_SR(sum) ((sum)->flags & NILFS_SS_SR)
|
|
#define NILFS_SEG_LOGBGN(sum) ((sum)->flags & NILFS_SS_LOGBGN)
|
|
#define NILFS_SEG_LOGEND(sum) ((sum)->flags & NILFS_SS_LOGEND)
|
|
#define NILFS_SEG_DSYNC(sum) ((sum)->flags & NILFS_SS_SYNDT)
|
|
#define NILFS_SEG_SIMPLEX(sum) \
|
|
(((sum)->flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == \
|
|
(NILFS_SS_LOGBGN | NILFS_SS_LOGEND))
|
|
|
|
#define NILFS_SEG_EMPTY(sum) ((sum)->nblocks == (sum)->nsumblk)
|
|
|
|
/**
|
|
* struct nilfs_segment_buffer - Segment buffer
|
|
* @sb_super: back pointer to a superblock struct
|
|
* @sb_list: List head to chain this structure
|
|
* @sb_segent: Pointer for attaching a segment entry
|
|
* @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_io_error: I/O error status
|
|
*/
|
|
struct nilfs_segment_buffer {
|
|
struct super_block *sb_super;
|
|
struct list_head sb_list;
|
|
struct nilfs_segment_entry *sb_segent;
|
|
|
|
/* 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 */
|
|
|
|
/* io status */
|
|
int sb_io_error;
|
|
};
|
|
|
|
#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)
|
|
|
|
|
|
int __init nilfs_init_segbuf_cache(void);
|
|
void nilfs_destroy_segbuf_cache(void);
|
|
struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
|
|
void nilfs_segbuf_free(struct nilfs_segment_buffer *);
|
|
int nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
|
|
struct the_nilfs *);
|
|
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);
|
|
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 *);
|
|
void nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *, u32);
|
|
void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *, u32);
|
|
|
|
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_release_buffers(struct list_head *);
|
|
|
|
static inline void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
nilfs_release_buffers(&segbuf->sb_segsum_buffers);
|
|
nilfs_release_buffers(&segbuf->sb_payload_buffers);
|
|
}
|
|
|
|
struct nilfs_write_info {
|
|
struct bio *bio;
|
|
int start, end; /* The region to be submitted */
|
|
int rest_blocks;
|
|
int max_pages;
|
|
int nr_vecs;
|
|
sector_t blocknr;
|
|
|
|
int nbio;
|
|
atomic_t err;
|
|
struct completion bio_event;
|
|
/* completion event of segment write */
|
|
|
|
/*
|
|
* The following fields must be set explicitly
|
|
*/
|
|
struct super_block *sb;
|
|
struct backing_dev_info *bdi; /* backing dev info */
|
|
struct buffer_head *bh_sr;
|
|
};
|
|
|
|
|
|
void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *,
|
|
struct nilfs_write_info *);
|
|
int nilfs_segbuf_write(struct nilfs_segment_buffer *,
|
|
struct nilfs_write_info *);
|
|
int nilfs_segbuf_wait(struct nilfs_segment_buffer *,
|
|
struct nilfs_write_info *);
|
|
|
|
#endif /* _NILFS_SEGBUF_H */
|