e3154e9748
This directly uses sb->s_fs_info to keep a nilfs filesystem object and
fully removes the intermediate nilfs_sb_info structure. With this
change, the hierarchy of on-memory structures of nilfs will be
simplified as follows:
Before:
super_block
-> nilfs_sb_info
-> the_nilfs
-> cptree --+-> nilfs_root (current file system)
+-> nilfs_root (snapshot A)
+-> nilfs_root (snapshot B)
:
-> nilfs_sc_info (log writer structure)
After:
super_block
-> the_nilfs
-> cptree --+-> nilfs_root (current file system)
+-> nilfs_root (snapshot A)
+-> nilfs_root (snapshot B)
:
-> nilfs_sc_info (log writer structure)
The reason why we didn't design so from the beginning is because the
initial shape also differed from the above. The early hierachy was
composed of "per-mount-point" super_block -> nilfs_sb_info pairs and a
shared nilfs object. On the kernel 2.6.37, it was changed to the
current shape in order to unify super block instances into one per
device, and this cleanup became applicable as the result.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
249 lines
8.2 KiB
C
249 lines
8.2 KiB
C
/*
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* segment.h - NILFS Segment constructor prototypes and definitions
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*
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*/
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#ifndef _NILFS_SEGMENT_H
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#define _NILFS_SEGMENT_H
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/nilfs2_fs.h>
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#include "nilfs.h"
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struct nilfs_root;
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/**
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* struct nilfs_recovery_info - Recovery information
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* @ri_need_recovery: Recovery status
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* @ri_super_root: Block number of the last super root
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* @ri_ri_cno: Number of the last checkpoint
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* @ri_lsegs_start: Region for roll-forwarding (start block number)
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* @ri_lsegs_end: Region for roll-forwarding (end block number)
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* @ri_lseg_start_seq: Sequence value of the segment at ri_lsegs_start
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* @ri_used_segments: List of segments to be mark active
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* @ri_pseg_start: Block number of the last partial segment
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* @ri_seq: Sequence number on the last partial segment
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* @ri_segnum: Segment number on the last partial segment
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* @ri_nextnum: Next segment number on the last partial segment
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*/
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struct nilfs_recovery_info {
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int ri_need_recovery;
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sector_t ri_super_root;
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__u64 ri_cno;
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sector_t ri_lsegs_start;
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sector_t ri_lsegs_end;
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u64 ri_lsegs_start_seq;
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struct list_head ri_used_segments;
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sector_t ri_pseg_start;
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u64 ri_seq;
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__u64 ri_segnum;
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__u64 ri_nextnum;
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};
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/* ri_need_recovery */
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#define NILFS_RECOVERY_SR_UPDATED 1 /* The super root was updated */
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#define NILFS_RECOVERY_ROLLFORWARD_DONE 2 /* Rollforward was carried out */
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/**
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* struct nilfs_cstage - Context of collection stage
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* @scnt: Stage count
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* @flags: State flags
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* @dirty_file_ptr: Pointer on dirty_files list, or inode of a target file
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* @gc_inode_ptr: Pointer on the list of gc-inodes
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*/
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struct nilfs_cstage {
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int scnt;
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unsigned flags;
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struct nilfs_inode_info *dirty_file_ptr;
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struct nilfs_inode_info *gc_inode_ptr;
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};
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struct nilfs_segment_buffer;
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struct nilfs_segsum_pointer {
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struct buffer_head *bh;
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unsigned offset; /* offset in bytes */
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};
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/**
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* struct nilfs_sc_info - Segment constructor information
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* @sc_super: Back pointer to super_block struct
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* @sc_root: root object of the current filesystem tree
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* @sc_nblk_inc: Block count of current generation
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* @sc_dirty_files: List of files to be written
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* @sc_gc_inodes: List of GC inodes having blocks to be written
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* @sc_copied_buffers: List of copied buffers (buffer heads) to freeze data
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* @sc_freesegs: array of segment numbers to be freed
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* @sc_nfreesegs: number of segments on @sc_freesegs
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* @sc_dsync_inode: inode whose data pages are written for a sync operation
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* @sc_dsync_start: start byte offset of data pages
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* @sc_dsync_end: end byte offset of data pages (inclusive)
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* @sc_segbufs: List of segment buffers
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* @sc_write_logs: List of segment buffers to hold logs under writing
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* @sc_segbuf_nblocks: Number of available blocks in segment buffers.
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* @sc_curseg: Current segment buffer
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* @sc_stage: Collection stage
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* @sc_finfo_ptr: pointer to the current finfo struct in the segment summary
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* @sc_binfo_ptr: pointer to the current binfo struct in the segment summary
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* @sc_blk_cnt: Block count of a file
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* @sc_datablk_cnt: Data block count of a file
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* @sc_nblk_this_inc: Number of blocks included in the current logical segment
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* @sc_seg_ctime: Creation time
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* @sc_cno: checkpoint number of current log
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* @sc_flags: Internal flags
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* @sc_state_lock: spinlock for sc_state and so on
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* @sc_state: Segctord state flags
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* @sc_flush_request: inode bitmap of metadata files to be flushed
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* @sc_wait_request: Client request queue
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* @sc_wait_daemon: Daemon wait queue
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* @sc_wait_task: Start/end wait queue to control segctord task
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* @sc_seq_request: Request counter
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* @sc_seq_accept: Accepted request count
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* @sc_seq_done: Completion counter
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* @sc_sync: Request of explicit sync operation
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* @sc_interval: Timeout value of background construction
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* @sc_mjcp_freq: Frequency of creating checkpoints
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* @sc_lseg_stime: Start time of the latest logical segment
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* @sc_watermark: Watermark for the number of dirty buffers
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* @sc_timer: Timer for segctord
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* @sc_task: current thread of segctord
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*/
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struct nilfs_sc_info {
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struct super_block *sc_super;
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struct nilfs_root *sc_root;
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unsigned long sc_nblk_inc;
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struct list_head sc_dirty_files;
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struct list_head sc_gc_inodes;
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struct list_head sc_copied_buffers;
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__u64 *sc_freesegs;
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size_t sc_nfreesegs;
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struct nilfs_inode_info *sc_dsync_inode;
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loff_t sc_dsync_start;
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loff_t sc_dsync_end;
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/* Segment buffers */
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struct list_head sc_segbufs;
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struct list_head sc_write_logs;
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unsigned long sc_segbuf_nblocks;
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struct nilfs_segment_buffer *sc_curseg;
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struct nilfs_cstage sc_stage;
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struct nilfs_segsum_pointer sc_finfo_ptr;
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struct nilfs_segsum_pointer sc_binfo_ptr;
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unsigned long sc_blk_cnt;
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unsigned long sc_datablk_cnt;
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unsigned long sc_nblk_this_inc;
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time_t sc_seg_ctime;
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__u64 sc_cno;
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unsigned long sc_flags;
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spinlock_t sc_state_lock;
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unsigned long sc_state;
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unsigned long sc_flush_request;
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wait_queue_head_t sc_wait_request;
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wait_queue_head_t sc_wait_daemon;
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wait_queue_head_t sc_wait_task;
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__u32 sc_seq_request;
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__u32 sc_seq_accepted;
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__u32 sc_seq_done;
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int sc_sync;
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unsigned long sc_interval;
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unsigned long sc_mjcp_freq;
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unsigned long sc_lseg_stime; /* in 1/HZ seconds */
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unsigned long sc_watermark;
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struct timer_list sc_timer;
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struct task_struct *sc_task;
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};
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/* sc_flags */
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enum {
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NILFS_SC_DIRTY, /* One or more dirty meta-data blocks exist */
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NILFS_SC_UNCLOSED, /* Logical segment is not closed */
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NILFS_SC_SUPER_ROOT, /* The latest segment has a super root */
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NILFS_SC_PRIOR_FLUSH, /* Requesting immediate flush without making a
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checkpoint */
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NILFS_SC_HAVE_DELTA, /* Next checkpoint will have update of files
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other than DAT, cpfile, sufile, or files
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moved by GC */
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};
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/* sc_state */
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#define NILFS_SEGCTOR_QUIT 0x0001 /* segctord is being destroyed */
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#define NILFS_SEGCTOR_COMMIT 0x0004 /* committed transaction exists */
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/*
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* Constant parameters
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*/
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#define NILFS_SC_CLEANUP_RETRY 3 /* Retry count of construction when
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destroying segctord */
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/*
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* Default values of timeout, in seconds.
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*/
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#define NILFS_SC_DEFAULT_TIMEOUT 5 /* Timeout value of dirty blocks.
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It triggers construction of a
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logical segment with a super root */
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#define NILFS_SC_DEFAULT_SR_FREQ 30 /* Maximum frequency of super root
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creation */
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/*
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* The default threshold amount of data, in block counts.
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*/
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#define NILFS_SC_DEFAULT_WATERMARK 3600
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/* super.c */
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extern struct kmem_cache *nilfs_transaction_cachep;
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/* segment.c */
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extern void nilfs_relax_pressure_in_lock(struct super_block *);
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extern int nilfs_construct_segment(struct super_block *);
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extern int nilfs_construct_dsync_segment(struct super_block *, struct inode *,
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loff_t, loff_t);
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extern void nilfs_flush_segment(struct super_block *, ino_t);
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extern int nilfs_clean_segments(struct super_block *, struct nilfs_argv *,
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void **);
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int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root);
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void nilfs_detach_log_writer(struct super_block *sb);
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/* recovery.c */
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extern int nilfs_read_super_root_block(struct the_nilfs *, sector_t,
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struct buffer_head **, int);
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extern int nilfs_search_super_root(struct the_nilfs *,
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struct nilfs_recovery_info *);
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int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, struct super_block *sb,
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struct nilfs_recovery_info *ri);
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extern void nilfs_dispose_segment_list(struct list_head *);
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#endif /* _NILFS_SEGMENT_H */
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