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41c88bd74d
This cleanup patch gives several improvements:
- Moving all kmem_cache_{create_destroy} calls into one place, which removes
some small function calls, cleans up error check code and clarify the logic.
- Mark all initial code in __init section.
- Remove some very obvious comments.
- Adjust some declarations.
- Fix some space-tab issues.
Signed-off-by: Li Hong <lihong.hi@gmail.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
183 lines
6.3 KiB
C
183 lines
6.3 KiB
C
/*
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* segbuf.h - NILFS Segment buffer prototypes and definitions
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*
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*/
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#ifndef _NILFS_SEGBUF_H
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#define _NILFS_SEGBUF_H
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/bio.h>
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#include <linux/completion.h>
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/**
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* struct nilfs_segsum_info - On-memory segment summary
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* @flags: Flags
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* @nfinfo: Number of file information structures
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* @nblocks: Number of blocks included in the partial segment
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* @nsumblk: Number of summary blocks
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* @sumbytes: Byte count of segment summary
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* @nfileblk: Total number of file blocks
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* @seg_seq: Segment sequence number
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* @ctime: Creation time
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* @next: Block number of the next full segment
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*/
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struct nilfs_segsum_info {
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unsigned int flags;
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unsigned long nfinfo;
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unsigned long nblocks;
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unsigned long nsumblk;
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unsigned long sumbytes;
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unsigned long nfileblk;
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u64 seg_seq;
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time_t ctime;
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sector_t next;
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};
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/* macro for the flags */
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#define NILFS_SEG_HAS_SR(sum) ((sum)->flags & NILFS_SS_SR)
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#define NILFS_SEG_LOGBGN(sum) ((sum)->flags & NILFS_SS_LOGBGN)
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#define NILFS_SEG_LOGEND(sum) ((sum)->flags & NILFS_SS_LOGEND)
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#define NILFS_SEG_DSYNC(sum) ((sum)->flags & NILFS_SS_SYNDT)
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#define NILFS_SEG_SIMPLEX(sum) \
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(((sum)->flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == \
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(NILFS_SS_LOGBGN | NILFS_SS_LOGEND))
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#define NILFS_SEG_EMPTY(sum) ((sum)->nblocks == (sum)->nsumblk)
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/**
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* struct nilfs_segment_buffer - Segment buffer
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* @sb_super: back pointer to a superblock struct
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* @sb_list: List head to chain this structure
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* @sb_sum: On-memory segment summary
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* @sb_segnum: Index number of the full segment
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* @sb_nextnum: Index number of the next full segment
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* @sb_fseg_start: Start block number of the full segment
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* @sb_fseg_end: End block number of the full segment
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* @sb_pseg_start: Disk block number of partial segment
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* @sb_rest_blocks: Number of residual blocks in the current segment
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* @sb_segsum_buffers: List of buffers for segment summaries
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* @sb_payload_buffers: List of buffers for segment payload
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* @sb_super_root: Pointer to buffer storing a super root block (if exists)
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* @sb_nbio: Number of flying bio requests
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* @sb_err: I/O error status
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* @sb_bio_event: Completion event of log writing
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*/
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struct nilfs_segment_buffer {
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struct super_block *sb_super;
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struct list_head sb_list;
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/* Segment information */
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struct nilfs_segsum_info sb_sum;
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__u64 sb_segnum;
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__u64 sb_nextnum;
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sector_t sb_fseg_start, sb_fseg_end;
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sector_t sb_pseg_start;
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unsigned sb_rest_blocks;
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/* Buffers */
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struct list_head sb_segsum_buffers;
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struct list_head sb_payload_buffers; /* including super root */
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struct buffer_head *sb_super_root;
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/* io status */
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int sb_nbio;
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atomic_t sb_err;
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struct completion sb_bio_event;
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};
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#define NILFS_LIST_SEGBUF(head) \
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list_entry((head), struct nilfs_segment_buffer, sb_list)
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#define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next)
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#define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev)
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#define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev)
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#define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next)
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#define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head))
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#define nilfs_for_each_segbuf_before(s, t, h) \
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for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \
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(s) = NILFS_NEXT_SEGBUF(s))
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#define NILFS_SEGBUF_FIRST_BH(head) \
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(list_entry((head)->next, struct buffer_head, b_assoc_buffers))
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#define NILFS_SEGBUF_NEXT_BH(bh) \
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(list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \
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b_assoc_buffers))
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#define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head)
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extern struct kmem_cache *nilfs_segbuf_cachep;
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int __init nilfs_init_segbuf_cache(void);
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void nilfs_destroy_segbuf_cache(void);
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struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
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void nilfs_segbuf_free(struct nilfs_segment_buffer *);
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void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
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struct the_nilfs *);
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void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
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struct nilfs_segment_buffer *prev);
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void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
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struct the_nilfs *);
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int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t);
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int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
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int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,
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struct buffer_head **);
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void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *);
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static inline void
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nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf,
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struct buffer_head *bh)
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{
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list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers);
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segbuf->sb_sum.nblocks++;
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segbuf->sb_sum.nsumblk++;
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}
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static inline void
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nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf,
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struct buffer_head *bh)
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{
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list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers);
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segbuf->sb_sum.nblocks++;
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}
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static inline void
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nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf,
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struct buffer_head *bh)
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{
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get_bh(bh);
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nilfs_segbuf_add_payload_buffer(segbuf, bh);
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segbuf->sb_sum.nfileblk++;
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}
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void nilfs_clear_logs(struct list_head *logs);
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void nilfs_truncate_logs(struct list_head *logs,
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struct nilfs_segment_buffer *last);
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int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs);
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int nilfs_wait_on_logs(struct list_head *logs);
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void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed);
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static inline void nilfs_destroy_logs(struct list_head *logs)
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{
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nilfs_truncate_logs(logs, NULL);
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}
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#endif /* _NILFS_SEGBUF_H */
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