1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * segment.h - NILFS Segment constructor prototypes and definitions 4 * 5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 6 * 7 * Written by Ryusuke Konishi. 8 * 9 */ 10 #ifndef _NILFS_SEGMENT_H 11 #define _NILFS_SEGMENT_H 12 13 #include <linux/types.h> 14 #include <linux/fs.h> 15 #include <linux/buffer_head.h> 16 #include <linux/workqueue.h> 17 #include "nilfs.h" 18 19 struct nilfs_root; 20 21 /** 22 * struct nilfs_recovery_info - Recovery information 23 * @ri_need_recovery: Recovery status 24 * @ri_super_root: Block number of the last super root 25 * @ri_ri_cno: Number of the last checkpoint 26 * @ri_lsegs_start: Region for roll-forwarding (start block number) 27 * @ri_lsegs_end: Region for roll-forwarding (end block number) 28 * @ri_lseg_start_seq: Sequence value of the segment at ri_lsegs_start 29 * @ri_used_segments: List of segments to be mark active 30 * @ri_pseg_start: Block number of the last partial segment 31 * @ri_seq: Sequence number on the last partial segment 32 * @ri_segnum: Segment number on the last partial segment 33 * @ri_nextnum: Next segment number on the last partial segment 34 */ 35 struct nilfs_recovery_info { 36 int ri_need_recovery; 37 sector_t ri_super_root; 38 __u64 ri_cno; 39 40 sector_t ri_lsegs_start; 41 sector_t ri_lsegs_end; 42 u64 ri_lsegs_start_seq; 43 struct list_head ri_used_segments; 44 sector_t ri_pseg_start; 45 u64 ri_seq; 46 __u64 ri_segnum; 47 __u64 ri_nextnum; 48 }; 49 50 /* ri_need_recovery */ 51 #define NILFS_RECOVERY_SR_UPDATED 1 /* The super root was updated */ 52 #define NILFS_RECOVERY_ROLLFORWARD_DONE 2 /* Rollforward was carried out */ 53 54 /** 55 * struct nilfs_cstage - Context of collection stage 56 * @scnt: Stage count, must be accessed via wrappers: 57 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() 58 * @flags: State flags 59 * @dirty_file_ptr: Pointer on dirty_files list, or inode of a target file 60 * @gc_inode_ptr: Pointer on the list of gc-inodes 61 */ 62 struct nilfs_cstage { 63 int scnt; 64 unsigned int flags; 65 struct nilfs_inode_info *dirty_file_ptr; 66 struct nilfs_inode_info *gc_inode_ptr; 67 }; 68 69 struct nilfs_segment_buffer; 70 71 struct nilfs_segsum_pointer { 72 struct buffer_head *bh; 73 unsigned int offset; /* offset in bytes */ 74 }; 75 76 /** 77 * struct nilfs_sc_info - Segment constructor information 78 * @sc_super: Back pointer to super_block struct 79 * @sc_root: root object of the current filesystem tree 80 * @sc_nblk_inc: Block count of current generation 81 * @sc_dirty_files: List of files to be written 82 * @sc_gc_inodes: List of GC inodes having blocks to be written 83 * @sc_iput_queue: list of inodes for which iput should be done 84 * @sc_iput_work: work struct to defer iput call 85 * @sc_freesegs: array of segment numbers to be freed 86 * @sc_nfreesegs: number of segments on @sc_freesegs 87 * @sc_dsync_inode: inode whose data pages are written for a sync operation 88 * @sc_dsync_start: start byte offset of data pages 89 * @sc_dsync_end: end byte offset of data pages (inclusive) 90 * @sc_segbufs: List of segment buffers 91 * @sc_write_logs: List of segment buffers to hold logs under writing 92 * @sc_segbuf_nblocks: Number of available blocks in segment buffers. 93 * @sc_curseg: Current segment buffer 94 * @sc_stage: Collection stage 95 * @sc_finfo_ptr: pointer to the current finfo struct in the segment summary 96 * @sc_binfo_ptr: pointer to the current binfo struct in the segment summary 97 * @sc_blk_cnt: Block count of a file 98 * @sc_datablk_cnt: Data block count of a file 99 * @sc_nblk_this_inc: Number of blocks included in the current logical segment 100 * @sc_seg_ctime: Creation time 101 * @sc_cno: checkpoint number of current log 102 * @sc_flags: Internal flags 103 * @sc_state_lock: spinlock for sc_state and so on 104 * @sc_state: Segctord state flags 105 * @sc_flush_request: inode bitmap of metadata files to be flushed 106 * @sc_wait_request: Client request queue 107 * @sc_wait_daemon: Daemon wait queue 108 * @sc_wait_task: Start/end wait queue to control segctord task 109 * @sc_seq_request: Request counter 110 * @sc_seq_accept: Accepted request count 111 * @sc_seq_done: Completion counter 112 * @sc_sync: Request of explicit sync operation 113 * @sc_interval: Timeout value of background construction 114 * @sc_mjcp_freq: Frequency of creating checkpoints 115 * @sc_lseg_stime: Start time of the latest logical segment 116 * @sc_watermark: Watermark for the number of dirty buffers 117 * @sc_timer: Timer for segctord 118 * @sc_task: current thread of segctord 119 */ 120 struct nilfs_sc_info { 121 struct super_block *sc_super; 122 struct nilfs_root *sc_root; 123 124 unsigned long sc_nblk_inc; 125 126 struct list_head sc_dirty_files; 127 struct list_head sc_gc_inodes; 128 struct list_head sc_iput_queue; 129 struct work_struct sc_iput_work; 130 131 __u64 *sc_freesegs; 132 size_t sc_nfreesegs; 133 134 struct nilfs_inode_info *sc_dsync_inode; 135 loff_t sc_dsync_start; 136 loff_t sc_dsync_end; 137 138 /* Segment buffers */ 139 struct list_head sc_segbufs; 140 struct list_head sc_write_logs; 141 unsigned long sc_segbuf_nblocks; 142 struct nilfs_segment_buffer *sc_curseg; 143 144 struct nilfs_cstage sc_stage; 145 146 struct nilfs_segsum_pointer sc_finfo_ptr; 147 struct nilfs_segsum_pointer sc_binfo_ptr; 148 unsigned long sc_blk_cnt; 149 unsigned long sc_datablk_cnt; 150 unsigned long sc_nblk_this_inc; 151 time64_t sc_seg_ctime; 152 __u64 sc_cno; 153 unsigned long sc_flags; 154 155 spinlock_t sc_state_lock; 156 unsigned long sc_state; 157 unsigned long sc_flush_request; 158 159 wait_queue_head_t sc_wait_request; 160 wait_queue_head_t sc_wait_daemon; 161 wait_queue_head_t sc_wait_task; 162 163 __u32 sc_seq_request; 164 __u32 sc_seq_accepted; 165 __u32 sc_seq_done; 166 167 int sc_sync; 168 unsigned long sc_interval; 169 unsigned long sc_mjcp_freq; 170 unsigned long sc_lseg_stime; /* in 1/HZ seconds */ 171 unsigned long sc_watermark; 172 173 struct timer_list sc_timer; 174 struct task_struct *sc_timer_task; 175 struct task_struct *sc_task; 176 }; 177 178 /* sc_flags */ 179 enum { 180 NILFS_SC_DIRTY, /* One or more dirty meta-data blocks exist */ 181 NILFS_SC_UNCLOSED, /* Logical segment is not closed */ 182 NILFS_SC_SUPER_ROOT, /* The latest segment has a super root */ 183 NILFS_SC_PRIOR_FLUSH, /* 184 * Requesting immediate flush without making a 185 * checkpoint 186 */ 187 NILFS_SC_HAVE_DELTA, /* 188 * Next checkpoint will have update of files 189 * other than DAT, cpfile, sufile, or files 190 * moved by GC. 191 */ 192 }; 193 194 /* sc_state */ 195 #define NILFS_SEGCTOR_QUIT 0x0001 /* segctord is being destroyed */ 196 #define NILFS_SEGCTOR_COMMIT 0x0004 /* committed transaction exists */ 197 198 /* 199 * Constant parameters 200 */ 201 #define NILFS_SC_CLEANUP_RETRY 3 /* 202 * Retry count of construction when 203 * destroying segctord 204 */ 205 206 /* 207 * Default values of timeout, in seconds. 208 */ 209 #define NILFS_SC_DEFAULT_TIMEOUT 5 /* 210 * Timeout value of dirty blocks. 211 * It triggers construction of a 212 * logical segment with a super root. 213 */ 214 #define NILFS_SC_DEFAULT_SR_FREQ 30 /* 215 * Maximum frequency of super root 216 * creation 217 */ 218 219 /* 220 * The default threshold amount of data, in block counts. 221 */ 222 #define NILFS_SC_DEFAULT_WATERMARK 3600 223 224 /* super.c */ 225 extern struct kmem_cache *nilfs_transaction_cachep; 226 227 /* segment.c */ 228 extern void nilfs_relax_pressure_in_lock(struct super_block *); 229 230 extern int nilfs_construct_segment(struct super_block *); 231 extern int nilfs_construct_dsync_segment(struct super_block *, struct inode *, 232 loff_t, loff_t); 233 extern void nilfs_flush_segment(struct super_block *, ino_t); 234 extern int nilfs_clean_segments(struct super_block *, struct nilfs_argv *, 235 void **); 236 237 int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root); 238 void nilfs_detach_log_writer(struct super_block *sb); 239 240 /* recovery.c */ 241 extern int nilfs_read_super_root_block(struct the_nilfs *, sector_t, 242 struct buffer_head **, int); 243 extern int nilfs_search_super_root(struct the_nilfs *, 244 struct nilfs_recovery_info *); 245 int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, struct super_block *sb, 246 struct nilfs_recovery_info *ri); 247 extern void nilfs_dispose_segment_list(struct list_head *); 248 249 #endif /* _NILFS_SEGMENT_H */ 250