/* 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 */
