/* SPDX-License-Identifier: GPL-2.0+ *//* * NILFS Segment constructor prototypes and definitions * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * Written by Ryusuke Konishi. * */#ifndef _NILFS_SEGMENT_H#define _NILFS_SEGMENT_H #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_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_lsegs_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 */#define NILFS_RECOVERY_SR_UPDATED	 1  /* The super root was updated */#define NILFS_RECOVERY_ROLLFORWARD_DONE	 2  /* 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_seq_request: Request counter * @sc_seq_accepted: 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;	time64_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; 	__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 */	NILFS_SC_PRIOR_FLUSH,	/*				 * Requesting immediate flush without making a				 * checkpoint				 */	NILFS_SC_HAVE_DELTA,	/*				 * Next checkpoint will have update of files				 * other than DAT, cpfile, sufile, or files				 * moved by GC.				 */}; /* sc_state */#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. */#define NILFS_SC_DEFAULT_TIMEOUT    5   /*					 * 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. */#define NILFS_SC_DEFAULT_WATERMARK  3600 /* 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 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 */