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249 lines
7.8 KiB
249 lines
7.8 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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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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* Written by Ryusuke Konishi. |
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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/workqueue.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, must be accessed via wrappers: |
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* nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() |
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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 int 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 int 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_iput_queue: list of inodes for which iput should be done |
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* @sc_iput_work: work struct to defer iput call |
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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_iput_queue; |
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struct work_struct sc_iput_work; |
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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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time64_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_timer_task; |
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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, /* |
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* Requesting immediate flush without making a |
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* checkpoint |
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*/ |
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NILFS_SC_HAVE_DELTA, /* |
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* 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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}; |
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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 /* |
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* Retry count of construction when |
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* destroying segctord |
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*/ |
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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 /* |
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* 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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*/ |
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#define NILFS_SC_DEFAULT_SR_FREQ 30 /* |
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* Maximum frequency of super root |
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* creation |
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*/ |
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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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