cregit-Linux how code gets into the kernel

Release 4.10 fs/nilfs2/segment.h

Directory: fs/nilfs2
 * segment.h - NILFS Segment constructor 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
 * GNU General Public License for more details.
 * Written by Ryusuke Konishi.


#include <linux/types.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/workqueue.h>
#include "nilfs.h"

struct nilfs_root;

 * struct nilfs_recovery_info - Recovery information
 * @ri_need_recovery: Recovery status
 * @ri_super_root: Block number of the last super root
 * @ri_ri_cno: Number of the last checkpoint
 * @ri_lsegs_start: Region for roll-forwarding (start block number)
 * @ri_lsegs_end: Region for roll-forwarding (end block number)
 * @ri_lseg_start_seq: Sequence value of the segment at ri_lsegs_start
 * @ri_used_segments: List of segments to be mark active
 * @ri_pseg_start: Block number of the last partial segment
 * @ri_seq: Sequence number on the last partial segment
 * @ri_segnum: Segment number on the last partial segment
 * @ri_nextnum: Next segment number on the last partial segment

struct nilfs_recovery_info {
int			ri_need_recovery;
sector_t		ri_super_root;
__u64			ri_cno;

sector_t		ri_lsegs_start;
sector_t		ri_lsegs_end;
u64			ri_lsegs_start_seq;
struct list_head	ri_used_segments;
sector_t		ri_pseg_start;
u64			ri_seq;
__u64			ri_segnum;
__u64			ri_nextnum;

/* ri_need_recovery */

/* The super root was updated */

/* Rollforward was carried out */

 * struct nilfs_cstage - Context of collection stage
 * @scnt: Stage count, must be accessed via wrappers:
 *        nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get()
 * @flags: State flags
 * @dirty_file_ptr: Pointer on dirty_files list, or inode of a target file
 * @gc_inode_ptr: Pointer on the list of gc-inodes

struct nilfs_cstage {
int			scnt;
unsigned int		flags;
struct nilfs_inode_info *dirty_file_ptr;
struct nilfs_inode_info *gc_inode_ptr;

struct nilfs_segment_buffer;

struct nilfs_segsum_pointer {
struct buffer_head     *bh;
unsigned int		offset; /* offset in bytes */

 * struct nilfs_sc_info - Segment constructor information
 * @sc_super: Back pointer to super_block struct
 * @sc_root: root object of the current filesystem tree
 * @sc_nblk_inc: Block count of current generation
 * @sc_dirty_files: List of files to be written
 * @sc_gc_inodes: List of GC inodes having blocks to be written
 * @sc_iput_queue: list of inodes for which iput should be done
 * @sc_iput_work: work struct to defer iput call
 * @sc_freesegs: array of segment numbers to be freed
 * @sc_nfreesegs: number of segments on @sc_freesegs
 * @sc_dsync_inode: inode whose data pages are written for a sync operation
 * @sc_dsync_start: start byte offset of data pages
 * @sc_dsync_end: end byte offset of data pages (inclusive)
 * @sc_segbufs: List of segment buffers
 * @sc_write_logs: List of segment buffers to hold logs under writing
 * @sc_segbuf_nblocks: Number of available blocks in segment buffers.
 * @sc_curseg: Current segment buffer
 * @sc_stage: Collection stage
 * @sc_finfo_ptr: pointer to the current finfo struct in the segment summary
 * @sc_binfo_ptr: pointer to the current binfo struct in the segment summary
 * @sc_blk_cnt: Block count of a file
 * @sc_datablk_cnt: Data block count of a file
 * @sc_nblk_this_inc: Number of blocks included in the current logical segment
 * @sc_seg_ctime: Creation time
 * @sc_cno: checkpoint number of current log
 * @sc_flags: Internal flags
 * @sc_state_lock: spinlock for sc_state and so on
 * @sc_state: Segctord state flags
 * @sc_flush_request: inode bitmap of metadata files to be flushed
 * @sc_wait_request: Client request queue
 * @sc_wait_daemon: Daemon wait queue
 * @sc_wait_task: Start/end wait queue to control segctord task
 * @sc_seq_request: Request counter
 * @sc_seq_accept: Accepted request count
 * @sc_seq_done: Completion counter
 * @sc_sync: Request of explicit sync operation
 * @sc_interval: Timeout value of background construction
 * @sc_mjcp_freq: Frequency of creating checkpoints
 * @sc_lseg_stime: Start time of the latest logical segment
 * @sc_watermark: Watermark for the number of dirty buffers
 * @sc_timer: Timer for segctord
 * @sc_task: current thread of segctord

struct nilfs_sc_info {
struct super_block     *sc_super;
struct nilfs_root      *sc_root;

unsigned long		sc_nblk_inc;

struct list_head	sc_dirty_files;
struct list_head	sc_gc_inodes;
struct list_head	sc_iput_queue;
struct work_struct	sc_iput_work;

__u64		       *sc_freesegs;
size_t			sc_nfreesegs;

struct nilfs_inode_info *sc_dsync_inode;
loff_t			sc_dsync_start;
loff_t			sc_dsync_end;

	/* Segment buffers */
struct list_head	sc_segbufs;
struct list_head	sc_write_logs;
unsigned long		sc_segbuf_nblocks;
struct nilfs_segment_buffer *sc_curseg;

struct nilfs_cstage	sc_stage;

struct nilfs_segsum_pointer sc_finfo_ptr;
struct nilfs_segsum_pointer sc_binfo_ptr;
unsigned long		sc_blk_cnt;
unsigned long		sc_datablk_cnt;
unsigned long		sc_nblk_this_inc;
time_t			sc_seg_ctime;
__u64			sc_cno;
unsigned long		sc_flags;

spinlock_t		sc_state_lock;
unsigned long		sc_state;
unsigned long		sc_flush_request;

wait_queue_head_t	sc_wait_request;
wait_queue_head_t	sc_wait_daemon;
wait_queue_head_t	sc_wait_task;

__u32			sc_seq_request;
__u32			sc_seq_accepted;
__u32			sc_seq_done;

int			sc_sync;
unsigned long		sc_interval;
unsigned long		sc_mjcp_freq;
unsigned long		sc_lseg_stime;	/* in 1/HZ seconds */
unsigned long		sc_watermark;

struct timer_list	sc_timer;
struct task_struct     *sc_task;

/* sc_flags */
enum {
NILFS_SC_DIRTY,		/* One or more dirty meta-data blocks exist */
NILFS_SC_UNCLOSED,	/* Logical segment is not closed */
NILFS_SC_SUPER_ROOT,	/* The latest segment has a super root */
                                 * Requesting immediate flush without making a
                                 * checkpoint
                                 * Next checkpoint will have update of files
                                 * other than DAT, cpfile, sufile, or files
                                 * moved by GC.

/* sc_state */

#define NILFS_SEGCTOR_QUIT	    0x0001  
/* segctord is being destroyed */

#define NILFS_SEGCTOR_COMMIT	    0x0004  
/* committed transaction exists */

 * Constant parameters

#define NILFS_SC_CLEANUP_RETRY	    3  
                                        * Retry count of construction when
                                        * destroying segctord

 * Default values of timeout, in seconds.

                                         * Timeout value of dirty blocks.
                                         * It triggers construction of a
                                         * logical segment with a super root.

#define NILFS_SC_DEFAULT_SR_FREQ    30  
                                         * Maximum frequency of super root
                                         * creation

 * The default threshold amount of data, in block counts.


/* super.c */
extern struct kmem_cache *nilfs_transaction_cachep;

/* segment.c */
extern void nilfs_relax_pressure_in_lock(struct super_block *);

extern int nilfs_construct_segment(struct super_block *);
extern int nilfs_construct_dsync_segment(struct super_block *, struct inode *,
					 loff_t, loff_t);
extern void nilfs_flush_segment(struct super_block *, ino_t);
extern int nilfs_clean_segments(struct super_block *, struct nilfs_argv *,
				void **);

int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root);
void nilfs_detach_log_writer(struct super_block *sb);

/* recovery.c */
extern int nilfs_read_super_root_block(struct the_nilfs *, sector_t,
				       struct buffer_head **, int);
extern int nilfs_search_super_root(struct the_nilfs *,
				   struct nilfs_recovery_info *);
int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, struct super_block *sb,
			      struct nilfs_recovery_info *ri);
extern void nilfs_dispose_segment_list(struct list_head *);

#endif /* _NILFS_SEGMENT_H */

Overall Contributors

ryusuke konishiryusuke konishi48398.37%1990.48%
li hongli hong71.43%14.76%
hitoshi mitakehitoshi mitake10.20%14.76%
Directory: fs/nilfs2
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