| /* | |
| * 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 | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * 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_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 */ | |
| #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_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 */ | |
| 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_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. | |
| */ | |
| #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 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 */ |