| /* |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| * Written by Ryusuke Konishi <ryusuke@osrg.net> |
| * |
| */ |
| #ifndef _NILFS_SEGMENT_H |
| #define _NILFS_SEGMENT_H |
| |
| #include <linux/types.h> |
| #include <linux/fs.h> |
| #include <linux/buffer_head.h> |
| #include <linux/nilfs2_fs.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 |
| * @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 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 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_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; |
| |
| __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 */ |
