164b5a32eSRyusuke Konishi /* 264b5a32eSRyusuke Konishi * segbuf.h - NILFS Segment buffer prototypes and definitions 364b5a32eSRyusuke Konishi * 464b5a32eSRyusuke Konishi * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 564b5a32eSRyusuke Konishi * 664b5a32eSRyusuke Konishi * This program is free software; you can redistribute it and/or modify 764b5a32eSRyusuke Konishi * it under the terms of the GNU General Public License as published by 864b5a32eSRyusuke Konishi * the Free Software Foundation; either version 2 of the License, or 964b5a32eSRyusuke Konishi * (at your option) any later version. 1064b5a32eSRyusuke Konishi * 1164b5a32eSRyusuke Konishi * This program is distributed in the hope that it will be useful, 1264b5a32eSRyusuke Konishi * but WITHOUT ANY WARRANTY; without even the implied warranty of 1364b5a32eSRyusuke Konishi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1464b5a32eSRyusuke Konishi * GNU General Public License for more details. 1564b5a32eSRyusuke Konishi * 164b420ab4SRyusuke Konishi * Written by Ryusuke Konishi. 1764b5a32eSRyusuke Konishi * 1864b5a32eSRyusuke Konishi */ 1964b5a32eSRyusuke Konishi #ifndef _NILFS_SEGBUF_H 2064b5a32eSRyusuke Konishi #define _NILFS_SEGBUF_H 2164b5a32eSRyusuke Konishi 2264b5a32eSRyusuke Konishi #include <linux/fs.h> 2364b5a32eSRyusuke Konishi #include <linux/buffer_head.h> 2464b5a32eSRyusuke Konishi #include <linux/bio.h> 2564b5a32eSRyusuke Konishi #include <linux/completion.h> 2664b5a32eSRyusuke Konishi 2764b5a32eSRyusuke Konishi /** 2864b5a32eSRyusuke Konishi * struct nilfs_segsum_info - On-memory segment summary 2964b5a32eSRyusuke Konishi * @flags: Flags 3064b5a32eSRyusuke Konishi * @nfinfo: Number of file information structures 3164b5a32eSRyusuke Konishi * @nblocks: Number of blocks included in the partial segment 3264b5a32eSRyusuke Konishi * @nsumblk: Number of summary blocks 3364b5a32eSRyusuke Konishi * @sumbytes: Byte count of segment summary 3464b5a32eSRyusuke Konishi * @nfileblk: Total number of file blocks 3564b5a32eSRyusuke Konishi * @seg_seq: Segment sequence number 3650614bcfSRyusuke Konishi * @cno: Checkpoint number 3764b5a32eSRyusuke Konishi * @ctime: Creation time 3864b5a32eSRyusuke Konishi * @next: Block number of the next full segment 3964b5a32eSRyusuke Konishi */ 4064b5a32eSRyusuke Konishi struct nilfs_segsum_info { 4164b5a32eSRyusuke Konishi unsigned int flags; 4264b5a32eSRyusuke Konishi unsigned long nfinfo; 4364b5a32eSRyusuke Konishi unsigned long nblocks; 4464b5a32eSRyusuke Konishi unsigned long nsumblk; 4564b5a32eSRyusuke Konishi unsigned long sumbytes; 4664b5a32eSRyusuke Konishi unsigned long nfileblk; 4764b5a32eSRyusuke Konishi u64 seg_seq; 4850614bcfSRyusuke Konishi __u64 cno; 4964b5a32eSRyusuke Konishi time_t ctime; 5064b5a32eSRyusuke Konishi sector_t next; 5164b5a32eSRyusuke Konishi }; 5264b5a32eSRyusuke Konishi 5364b5a32eSRyusuke Konishi /** 5464b5a32eSRyusuke Konishi * struct nilfs_segment_buffer - Segment buffer 5564b5a32eSRyusuke Konishi * @sb_super: back pointer to a superblock struct 5664b5a32eSRyusuke Konishi * @sb_list: List head to chain this structure 5764b5a32eSRyusuke Konishi * @sb_sum: On-memory segment summary 5864b5a32eSRyusuke Konishi * @sb_segnum: Index number of the full segment 5964b5a32eSRyusuke Konishi * @sb_nextnum: Index number of the next full segment 6064b5a32eSRyusuke Konishi * @sb_fseg_start: Start block number of the full segment 6164b5a32eSRyusuke Konishi * @sb_fseg_end: End block number of the full segment 6264b5a32eSRyusuke Konishi * @sb_pseg_start: Disk block number of partial segment 6364b5a32eSRyusuke Konishi * @sb_rest_blocks: Number of residual blocks in the current segment 6464b5a32eSRyusuke Konishi * @sb_segsum_buffers: List of buffers for segment summaries 6564b5a32eSRyusuke Konishi * @sb_payload_buffers: List of buffers for segment payload 661e2b68bfSRyusuke Konishi * @sb_super_root: Pointer to buffer storing a super root block (if exists) 679284ad2aSRyusuke Konishi * @sb_nbio: Number of flying bio requests 689284ad2aSRyusuke Konishi * @sb_err: I/O error status 699284ad2aSRyusuke Konishi * @sb_bio_event: Completion event of log writing 7064b5a32eSRyusuke Konishi */ 7164b5a32eSRyusuke Konishi struct nilfs_segment_buffer { 7264b5a32eSRyusuke Konishi struct super_block *sb_super; 7364b5a32eSRyusuke Konishi struct list_head sb_list; 7464b5a32eSRyusuke Konishi 7564b5a32eSRyusuke Konishi /* Segment information */ 7664b5a32eSRyusuke Konishi struct nilfs_segsum_info sb_sum; 7764b5a32eSRyusuke Konishi __u64 sb_segnum; 7864b5a32eSRyusuke Konishi __u64 sb_nextnum; 7964b5a32eSRyusuke Konishi sector_t sb_fseg_start, sb_fseg_end; 8064b5a32eSRyusuke Konishi sector_t sb_pseg_start; 810c6c44cbSRyusuke Konishi unsigned int sb_rest_blocks; 8264b5a32eSRyusuke Konishi 8364b5a32eSRyusuke Konishi /* Buffers */ 8464b5a32eSRyusuke Konishi struct list_head sb_segsum_buffers; 8564b5a32eSRyusuke Konishi struct list_head sb_payload_buffers; /* including super root */ 861e2b68bfSRyusuke Konishi struct buffer_head *sb_super_root; 8764b5a32eSRyusuke Konishi 8864b5a32eSRyusuke Konishi /* io status */ 899284ad2aSRyusuke Konishi int sb_nbio; 909284ad2aSRyusuke Konishi atomic_t sb_err; 919284ad2aSRyusuke Konishi struct completion sb_bio_event; 9264b5a32eSRyusuke Konishi }; 9364b5a32eSRyusuke Konishi 9464b5a32eSRyusuke Konishi #define NILFS_LIST_SEGBUF(head) \ 9564b5a32eSRyusuke Konishi list_entry((head), struct nilfs_segment_buffer, sb_list) 9664b5a32eSRyusuke Konishi #define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next) 9764b5a32eSRyusuke Konishi #define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev) 9864b5a32eSRyusuke Konishi #define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev) 9964b5a32eSRyusuke Konishi #define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next) 10064b5a32eSRyusuke Konishi #define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head)) 10164b5a32eSRyusuke Konishi 10264b5a32eSRyusuke Konishi #define nilfs_for_each_segbuf_before(s, t, h) \ 10364b5a32eSRyusuke Konishi for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \ 10464b5a32eSRyusuke Konishi (s) = NILFS_NEXT_SEGBUF(s)) 10564b5a32eSRyusuke Konishi 10664b5a32eSRyusuke Konishi #define NILFS_SEGBUF_FIRST_BH(head) \ 10764b5a32eSRyusuke Konishi (list_entry((head)->next, struct buffer_head, b_assoc_buffers)) 10864b5a32eSRyusuke Konishi #define NILFS_SEGBUF_NEXT_BH(bh) \ 10964b5a32eSRyusuke Konishi (list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \ 11064b5a32eSRyusuke Konishi b_assoc_buffers)) 11164b5a32eSRyusuke Konishi #define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head) 11264b5a32eSRyusuke Konishi 11341c88bd7SLi Hong extern struct kmem_cache *nilfs_segbuf_cachep; 11464b5a32eSRyusuke Konishi 11564b5a32eSRyusuke Konishi struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *); 11664b5a32eSRyusuke Konishi void nilfs_segbuf_free(struct nilfs_segment_buffer *); 117cece5520SRyusuke Konishi void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long, 11864b5a32eSRyusuke Konishi struct the_nilfs *); 119a694291aSRyusuke Konishi void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, 120a694291aSRyusuke Konishi struct nilfs_segment_buffer *prev); 12164b5a32eSRyusuke Konishi void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64, 12264b5a32eSRyusuke Konishi struct the_nilfs *); 1230c6c44cbSRyusuke Konishi int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned int, time_t, 1240c6c44cbSRyusuke Konishi __u64); 12564b5a32eSRyusuke Konishi int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *); 12664b5a32eSRyusuke Konishi int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *, 12764b5a32eSRyusuke Konishi struct buffer_head **); 12864b5a32eSRyusuke Konishi void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *); 12964b5a32eSRyusuke Konishi 1304762077cSRyusuke Konishi static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf) 1314762077cSRyusuke Konishi { 1324762077cSRyusuke Konishi unsigned int flags = segbuf->sb_sum.flags; 1334762077cSRyusuke Konishi 1344762077cSRyusuke Konishi return (flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == 1354762077cSRyusuke Konishi (NILFS_SS_LOGBGN | NILFS_SS_LOGEND); 1364762077cSRyusuke Konishi } 1374762077cSRyusuke Konishi 1384762077cSRyusuke Konishi static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf) 1394762077cSRyusuke Konishi { 1404762077cSRyusuke Konishi return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk; 1414762077cSRyusuke Konishi } 1424762077cSRyusuke Konishi 14364b5a32eSRyusuke Konishi static inline void 14464b5a32eSRyusuke Konishi nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf, 14564b5a32eSRyusuke Konishi struct buffer_head *bh) 14664b5a32eSRyusuke Konishi { 14764b5a32eSRyusuke Konishi list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers); 14864b5a32eSRyusuke Konishi segbuf->sb_sum.nblocks++; 14964b5a32eSRyusuke Konishi segbuf->sb_sum.nsumblk++; 15064b5a32eSRyusuke Konishi } 15164b5a32eSRyusuke Konishi 15264b5a32eSRyusuke Konishi static inline void 15364b5a32eSRyusuke Konishi nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf, 15464b5a32eSRyusuke Konishi struct buffer_head *bh) 15564b5a32eSRyusuke Konishi { 15664b5a32eSRyusuke Konishi list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers); 15764b5a32eSRyusuke Konishi segbuf->sb_sum.nblocks++; 15864b5a32eSRyusuke Konishi } 15964b5a32eSRyusuke Konishi 16064b5a32eSRyusuke Konishi static inline void 16164b5a32eSRyusuke Konishi nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf, 16264b5a32eSRyusuke Konishi struct buffer_head *bh) 16364b5a32eSRyusuke Konishi { 16464b5a32eSRyusuke Konishi get_bh(bh); 16564b5a32eSRyusuke Konishi nilfs_segbuf_add_payload_buffer(segbuf, bh); 16664b5a32eSRyusuke Konishi segbuf->sb_sum.nfileblk++; 16764b5a32eSRyusuke Konishi } 16864b5a32eSRyusuke Konishi 169e29df395SRyusuke Konishi void nilfs_clear_logs(struct list_head *logs); 170e29df395SRyusuke Konishi void nilfs_truncate_logs(struct list_head *logs, 171e29df395SRyusuke Konishi struct nilfs_segment_buffer *last); 172d1c6b72aSRyusuke Konishi int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs); 173e29df395SRyusuke Konishi int nilfs_wait_on_logs(struct list_head *logs); 174aaed1d5bSRyusuke Konishi void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed); 175e29df395SRyusuke Konishi 176e29df395SRyusuke Konishi static inline void nilfs_destroy_logs(struct list_head *logs) 177e29df395SRyusuke Konishi { 178e29df395SRyusuke Konishi nilfs_truncate_logs(logs, NULL); 179e29df395SRyusuke Konishi } 180e29df395SRyusuke Konishi 18164b5a32eSRyusuke Konishi #endif /* _NILFS_SEGBUF_H */ 182