fs/f2fs/segment.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/segment.h
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/blkdev.h>
   9 #include <linux/backing-dev.h>
  10
  11 /* constant macro */
  12 #define NULL_SEGNO                      ((unsigned int)(~0))
  13 #define NULL_SECNO                      ((unsigned int)(~0))
  14
  15 #define DEF_RECLAIM_PREFREE_SEGMENTS    5       /* 5% over total segments */
  16 #define DEF_MAX_RECLAIM_PREFREE_SEGMENTS        4096    /* 8GB in maximum */
  17
  18 #define F2FS_MIN_SEGMENTS       9 /* SB + 2 (CP + SIT + NAT) + SSA + MAIN */
  19
  20 /* L: Logical segment # in volume, R: Relative segment # in main area */
  21 #define GET_L2R_SEGNO(free_i, segno)    ((segno) - (free_i)->start_segno)
  22 #define GET_R2L_SEGNO(free_i, segno)    ((segno) + (free_i)->start_segno)
  23
  24 #define IS_DATASEG(t)   ((t) <= CURSEG_COLD_DATA)
  25 #define IS_NODESEG(t)   ((t) >= CURSEG_HOT_NODE)
  26
  27 #define IS_HOT(t)       ((t) == CURSEG_HOT_NODE || (t) == CURSEG_HOT_DATA)
  28 #define IS_WARM(t)      ((t) == CURSEG_WARM_NODE || (t) == CURSEG_WARM_DATA)
  29 #define IS_COLD(t)      ((t) == CURSEG_COLD_NODE || (t) == CURSEG_COLD_DATA)
  30
  31 #define IS_CURSEG(sbi, seg)                                             \
  32         (((seg) == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno) ||    \
  33          ((seg) == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno) ||   \
  34          ((seg) == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) ||   \
  35          ((seg) == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) ||    \
  36          ((seg) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) ||   \
  37          ((seg) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno))
  38
  39 #define IS_CURSEC(sbi, secno)                                           \
  40         (((secno) == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno /            \
  41           (sbi)->segs_per_sec) ||       \
  42          ((secno) == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno /           \
  43           (sbi)->segs_per_sec) ||       \
  44          ((secno) == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno /           \
  45           (sbi)->segs_per_sec) ||       \
  46          ((secno) == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno /            \
  47           (sbi)->segs_per_sec) ||       \
  48          ((secno) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno /           \
  49           (sbi)->segs_per_sec) ||       \
  50          ((secno) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /           \
  51           (sbi)->segs_per_sec)) \
  52
  53 #define MAIN_BLKADDR(sbi)                                               \
  54         (SM_I(sbi) ? SM_I(sbi)->main_blkaddr :                          \
  55                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->main_blkaddr))
  56 #define SEG0_BLKADDR(sbi)                                               \
  57         (SM_I(sbi) ? SM_I(sbi)->seg0_blkaddr :                          \
  58                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment0_blkaddr))
  59
  60 #define MAIN_SEGS(sbi)  (SM_I(sbi)->main_segments)
  61 #define MAIN_SECS(sbi)  ((sbi)->total_sections)
  62
  63 #define TOTAL_SEGS(sbi)                                                 \
  64         (SM_I(sbi) ? SM_I(sbi)->segment_count :                                 \
  65                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment_count))
  66 #define TOTAL_BLKS(sbi) (TOTAL_SEGS(sbi) << (sbi)->log_blocks_per_seg)
  67
  68 #define MAX_BLKADDR(sbi)        (SEG0_BLKADDR(sbi) + TOTAL_BLKS(sbi))
  69 #define SEGMENT_SIZE(sbi)       (1ULL << ((sbi)->log_blocksize +        \
  70                                         (sbi)->log_blocks_per_seg))
  71
  72 #define START_BLOCK(sbi, segno) (SEG0_BLKADDR(sbi) +                    \
  73          (GET_R2L_SEGNO(FREE_I(sbi), segno) << (sbi)->log_blocks_per_seg))
  74
  75 #define NEXT_FREE_BLKADDR(sbi, curseg)                                  \
  76         (START_BLOCK(sbi, (curseg)->segno) + (curseg)->next_blkoff)
  77
  78 #define GET_SEGOFF_FROM_SEG0(sbi, blk_addr)     ((blk_addr) - SEG0_BLKADDR(sbi))
  79 #define GET_SEGNO_FROM_SEG0(sbi, blk_addr)                              \
  80         (GET_SEGOFF_FROM_SEG0(sbi, blk_addr) >> (sbi)->log_blocks_per_seg)
  81 #define GET_BLKOFF_FROM_SEG0(sbi, blk_addr)                             \
  82         (GET_SEGOFF_FROM_SEG0(sbi, blk_addr) & ((sbi)->blocks_per_seg - 1))
  83
  84 #define GET_SEGNO(sbi, blk_addr)                                        \
  85         ((!__is_valid_data_blkaddr(blk_addr)) ?                 \
  86         NULL_SEGNO : GET_L2R_SEGNO(FREE_I(sbi),                 \
  87                 GET_SEGNO_FROM_SEG0(sbi, blk_addr)))
  88 #define BLKS_PER_SEC(sbi)                                       \
  89         ((sbi)->segs_per_sec * (sbi)->blocks_per_seg)
  90 #define GET_SEC_FROM_SEG(sbi, segno)                            \
  91         ((segno) / (sbi)->segs_per_sec)
  92 #define GET_SEG_FROM_SEC(sbi, secno)                            \
  93         ((secno) * (sbi)->segs_per_sec)
  94 #define GET_ZONE_FROM_SEC(sbi, secno)                           \
  95         ((secno) / (sbi)->secs_per_zone)
  96 #define GET_ZONE_FROM_SEG(sbi, segno)                           \
  97         GET_ZONE_FROM_SEC(sbi, GET_SEC_FROM_SEG(sbi, segno))
  98
  99 #define GET_SUM_BLOCK(sbi, segno)                               \
 100         ((sbi)->sm_info->ssa_blkaddr + (segno))
 101
 102 #define GET_SUM_TYPE(footer) ((footer)->entry_type)
 103 #define SET_SUM_TYPE(footer, type) ((footer)->entry_type = (type))
 104
 105 #define SIT_ENTRY_OFFSET(sit_i, segno)                                  \
 106         ((segno) % (sit_i)->sents_per_block)
 107 #define SIT_BLOCK_OFFSET(segno)                                 \
 108         ((segno) / SIT_ENTRY_PER_BLOCK)
 109 #define START_SEGNO(segno)              \
 110         (SIT_BLOCK_OFFSET(segno) * SIT_ENTRY_PER_BLOCK)
 111 #define SIT_BLK_CNT(sbi)                        \
 112         DIV_ROUND_UP(MAIN_SEGS(sbi), SIT_ENTRY_PER_BLOCK)
 113 #define f2fs_bitmap_size(nr)                    \
 114         (BITS_TO_LONGS(nr) * sizeof(unsigned long))
 115
 116 #define SECTOR_FROM_BLOCK(blk_addr)                                     \
 117         (((sector_t)blk_addr) << F2FS_LOG_SECTORS_PER_BLOCK)
 118 #define SECTOR_TO_BLOCK(sectors)                                        \
 119         ((sectors) >> F2FS_LOG_SECTORS_PER_BLOCK)
 120
 121 /*
 122  * indicate a block allocation direction: RIGHT and LEFT.
 123  * RIGHT means allocating new sections towards the end of volume.
 124  * LEFT means the opposite direction.
 125  */
 126 enum {
 127         ALLOC_RIGHT = 0,
 128         ALLOC_LEFT
 129 };
 130
 131 /*
 132  * In the victim_sel_policy->alloc_mode, there are two block allocation modes.
 133  * LFS writes data sequentially with cleaning operations.
 134  * SSR (Slack Space Recycle) reuses obsolete space without cleaning operations.
 135  */
 136 enum {
 137         LFS = 0,
 138         SSR
 139 };
 140
 141 /*
 142  * In the victim_sel_policy->gc_mode, there are two gc, aka cleaning, modes.
 143  * GC_CB is based on cost-benefit algorithm.
 144  * GC_GREEDY is based on greedy algorithm.
 145  */
 146 enum {
 147         GC_CB = 0,
 148         GC_GREEDY,
 149         ALLOC_NEXT,
 150         FLUSH_DEVICE,
 151         MAX_GC_POLICY,
 152 };
 153
 154 /*
 155  * BG_GC means the background cleaning job.
 156  * FG_GC means the on-demand cleaning job.
 157  * FORCE_FG_GC means on-demand cleaning job in background.
 158  */
 159 enum {
 160         BG_GC = 0,
 161         FG_GC,
 162         FORCE_FG_GC,
 163 };
 164
 165 /* for a function parameter to select a victim segment */
 166 struct victim_sel_policy {
 167         int alloc_mode;                 /* LFS or SSR */
 168         int gc_mode;                    /* GC_CB or GC_GREEDY */
 169         unsigned long *dirty_segmap;    /* dirty segment bitmap */
 170         unsigned int max_search;        /* maximum # of segments to search */
 171         unsigned int offset;            /* last scanned bitmap offset */
 172         unsigned int ofs_unit;          /* bitmap search unit */
 173         unsigned int min_cost;          /* minimum cost */
 174         unsigned int min_segno;         /* segment # having min. cost */
 175 };
 176
 177 struct seg_entry {
 178         unsigned int type:6;            /* segment type like CURSEG_XXX_TYPE */
 179         unsigned int valid_blocks:10;   /* # of valid blocks */
 180         unsigned int ckpt_valid_blocks:10;      /* # of valid blocks last cp */
 181         unsigned int padding:6;         /* padding */
 182         unsigned char *cur_valid_map;   /* validity bitmap of blocks */
 183 #ifdef CONFIG_F2FS_CHECK_FS
 184         unsigned char *cur_valid_map_mir;       /* mirror of current valid bitmap */
 185 #endif
 186         /*
 187          * # of valid blocks and the validity bitmap stored in the the last
 188          * checkpoint pack. This information is used by the SSR mode.
 189          */
 190         unsigned char *ckpt_valid_map;  /* validity bitmap of blocks last cp */
 191         unsigned char *discard_map;
 192         unsigned long long mtime;       /* modification time of the segment */
 193 };
 194
 195 struct sec_entry {
 196         unsigned int valid_blocks;      /* # of valid blocks in a section */
 197 };
 198
 199 struct segment_allocation {
 200         void (*allocate_segment)(struct f2fs_sb_info *, int, bool);
 201 };
 202
 203 #define MAX_SKIP_GC_COUNT                       16
 204
 205 struct inmem_pages {
 206         struct list_head list;
 207         struct page *page;
 208         block_t old_addr;               /* for revoking when fail to commit */
 209 };
 210
 211 struct sit_info {
 212         const struct segment_allocation *s_ops;
 213
 214         block_t sit_base_addr;          /* start block address of SIT area */
 215         block_t sit_blocks;             /* # of blocks used by SIT area */
 216         block_t written_valid_blocks;   /* # of valid blocks in main area */
 217         char *bitmap;                   /* all bitmaps pointer */
 218         char *sit_bitmap;               /* SIT bitmap pointer */
 219 #ifdef CONFIG_F2FS_CHECK_FS
 220         char *sit_bitmap_mir;           /* SIT bitmap mirror */
 221
 222         /* bitmap of segments to be ignored by GC in case of errors */
 223         unsigned long *invalid_segmap;
 224 #endif
 225         unsigned int bitmap_size;       /* SIT bitmap size */
 226
 227         unsigned long *tmp_map;                 /* bitmap for temporal use */
 228         unsigned long *dirty_sentries_bitmap;   /* bitmap for dirty sentries */
 229         unsigned int dirty_sentries;            /* # of dirty sentries */
 230         unsigned int sents_per_block;           /* # of SIT entries per block */
 231         struct rw_semaphore sentry_lock;        /* to protect SIT cache */
 232         struct seg_entry *sentries;             /* SIT segment-level cache */
 233         struct sec_entry *sec_entries;          /* SIT section-level cache */
 234
 235         /* for cost-benefit algorithm in cleaning procedure */
 236         unsigned long long elapsed_time;        /* elapsed time after mount */
 237         unsigned long long mounted_time;        /* mount time */
 238         unsigned long long min_mtime;           /* min. modification time */
 239         unsigned long long max_mtime;           /* max. modification time */
 240
 241         unsigned int last_victim[MAX_GC_POLICY]; /* last victim segment # */
 242 };
 243
 244 struct free_segmap_info {
 245         unsigned int start_segno;       /* start segment number logically */
 246         unsigned int free_segments;     /* # of free segments */
 247         unsigned int free_sections;     /* # of free sections */
 248         spinlock_t segmap_lock;         /* free segmap lock */
 249         unsigned long *free_segmap;     /* free segment bitmap */
 250         unsigned long *free_secmap;     /* free section bitmap */
 251 };
 252
 253 /* Notice: The order of dirty type is same with CURSEG_XXX in f2fs.h */
 254 enum dirty_type {
 255         DIRTY_HOT_DATA,         /* dirty segments assigned as hot data logs */
 256         DIRTY_WARM_DATA,        /* dirty segments assigned as warm data logs */
 257         DIRTY_COLD_DATA,        /* dirty segments assigned as cold data logs */
 258         DIRTY_HOT_NODE,         /* dirty segments assigned as hot node logs */
 259         DIRTY_WARM_NODE,        /* dirty segments assigned as warm node logs */
 260         DIRTY_COLD_NODE,        /* dirty segments assigned as cold node logs */
 261         DIRTY,                  /* to count # of dirty segments */
 262         PRE,                    /* to count # of entirely obsolete segments */
 263         NR_DIRTY_TYPE
 264 };
 265
 266 struct dirty_seglist_info {
 267         const struct victim_selection *v_ops;   /* victim selction operation */
 268         unsigned long *dirty_segmap[NR_DIRTY_TYPE];
 269         struct mutex seglist_lock;              /* lock for segment bitmaps */
 270         int nr_dirty[NR_DIRTY_TYPE];            /* # of dirty segments */
 271         unsigned long *victim_secmap;           /* background GC victims */
 272 };
 273
 274 /* victim selection function for cleaning and SSR */
 275 struct victim_selection {
 276         int (*get_victim)(struct f2fs_sb_info *, unsigned int *,
 277                                                         int, int, char);
 278 };
 279
 280 /* for active log information */
 281 struct curseg_info {
 282         struct mutex curseg_mutex;              /* lock for consistency */
 283         struct f2fs_summary_block *sum_blk;     /* cached summary block */
 284         struct rw_semaphore journal_rwsem;      /* protect journal area */
 285         struct f2fs_journal *journal;           /* cached journal info */
 286         unsigned char alloc_type;               /* current allocation type */
 287         unsigned int segno;                     /* current segment number */
 288         unsigned short next_blkoff;             /* next block offset to write */
 289         unsigned int zone;                      /* current zone number */
 290         unsigned int next_segno;                /* preallocated segment */
 291 };
 292
 293 struct sit_entry_set {
 294         struct list_head set_list;      /* link with all sit sets */
 295         unsigned int start_segno;       /* start segno of sits in set */
 296         unsigned int entry_cnt;         /* the # of sit entries in set */
 297 };
 298
 299 /*
 300  * inline functions
 301  */
 302 static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
 303 {
 304         if (type == CURSEG_COLD_DATA_PINNED)
 305                 type = CURSEG_COLD_DATA;
 306         return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
 307 }
 308
 309 static inline struct seg_entry *get_seg_entry(struct f2fs_sb_info *sbi,
 310                                                 unsigned int segno)
 311 {
 312         struct sit_info *sit_i = SIT_I(sbi);
 313         return &sit_i->sentries[segno];
 314 }
 315
 316 static inline struct sec_entry *get_sec_entry(struct f2fs_sb_info *sbi,
 317                                                 unsigned int segno)
 318 {
 319         struct sit_info *sit_i = SIT_I(sbi);
 320         return &sit_i->sec_entries[GET_SEC_FROM_SEG(sbi, segno)];
 321 }
 322
 323 static inline unsigned int get_valid_blocks(struct f2fs_sb_info *sbi,
 324                                 unsigned int segno, bool use_section)
 325 {
 326         /*
 327          * In order to get # of valid blocks in a section instantly from many
 328          * segments, f2fs manages two counting structures separately.
 329          */
 330         if (use_section && __is_large_section(sbi))
 331                 return get_sec_entry(sbi, segno)->valid_blocks;
 332         else
 333                 return get_seg_entry(sbi, segno)->valid_blocks;
 334 }
 335
 336 static inline unsigned int get_ckpt_valid_blocks(struct f2fs_sb_info *sbi,
 337                                 unsigned int segno)
 338 {
 339         return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
 340 }
 341
 342 static inline void seg_info_from_raw_sit(struct seg_entry *se,
 343                                         struct f2fs_sit_entry *rs)
 344 {
 345         se->valid_blocks = GET_SIT_VBLOCKS(rs);
 346         se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);
 347         memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 348         memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 349 #ifdef CONFIG_F2FS_CHECK_FS
 350         memcpy(se->cur_valid_map_mir, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 351 #endif
 352         se->type = GET_SIT_TYPE(rs);
 353         se->mtime = le64_to_cpu(rs->mtime);
 354 }
 355
 356 static inline void __seg_info_to_raw_sit(struct seg_entry *se,
 357                                         struct f2fs_sit_entry *rs)
 358 {
 359         unsigned short raw_vblocks = (se->type << SIT_VBLOCKS_SHIFT) |
 360                                         se->valid_blocks;
 361         rs->vblocks = cpu_to_le16(raw_vblocks);
 362         memcpy(rs->valid_map, se->cur_valid_map, SIT_VBLOCK_MAP_SIZE);
 363         rs->mtime = cpu_to_le64(se->mtime);
 364 }
 365
 366 static inline void seg_info_to_sit_page(struct f2fs_sb_info *sbi,
 367                                 struct page *page, unsigned int start)
 368 {
 369         struct f2fs_sit_block *raw_sit;
 370         struct seg_entry *se;
 371         struct f2fs_sit_entry *rs;
 372         unsigned int end = min(start + SIT_ENTRY_PER_BLOCK,
 373                                         (unsigned long)MAIN_SEGS(sbi));
 374         int i;
 375
 376         raw_sit = (struct f2fs_sit_block *)page_address(page);
 377         memset(raw_sit, 0, PAGE_SIZE);
 378         for (i = 0; i < end - start; i++) {
 379                 rs = &raw_sit->entries[i];
 380                 se = get_seg_entry(sbi, start + i);
 381                 __seg_info_to_raw_sit(se, rs);
 382         }
 383 }
 384
 385 static inline void seg_info_to_raw_sit(struct seg_entry *se,
 386                                         struct f2fs_sit_entry *rs)
 387 {
 388         __seg_info_to_raw_sit(se, rs);
 389
 390         memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 391         se->ckpt_valid_blocks = se->valid_blocks;
 392 }
 393
 394 static inline unsigned int find_next_inuse(struct free_segmap_info *free_i,
 395                 unsigned int max, unsigned int segno)
 396 {
 397         unsigned int ret;
 398         spin_lock(&free_i->segmap_lock);
 399         ret = find_next_bit(free_i->free_segmap, max, segno);
 400         spin_unlock(&free_i->segmap_lock);
 401         return ret;
 402 }
 403
 404 static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
 405 {
 406         struct free_segmap_info *free_i = FREE_I(sbi);
 407         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 408         unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
 409         unsigned int next;
 410
 411         spin_lock(&free_i->segmap_lock);
 412         clear_bit(segno, free_i->free_segmap);
 413         free_i->free_segments++;
 414
 415         next = find_next_bit(free_i->free_segmap,
 416                         start_segno + sbi->segs_per_sec, start_segno);
 417         if (next >= start_segno + sbi->segs_per_sec) {
 418                 clear_bit(secno, free_i->free_secmap);
 419                 free_i->free_sections++;
 420         }
 421         spin_unlock(&free_i->segmap_lock);
 422 }
 423
 424 static inline void __set_inuse(struct f2fs_sb_info *sbi,
 425                 unsigned int segno)
 426 {
 427         struct free_segmap_info *free_i = FREE_I(sbi);
 428         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 429
 430         set_bit(segno, free_i->free_segmap);
 431         free_i->free_segments--;
 432         if (!test_and_set_bit(secno, free_i->free_secmap))
 433                 free_i->free_sections--;
 434 }
 435
 436 static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
 437                 unsigned int segno)
 438 {
 439         struct free_segmap_info *free_i = FREE_I(sbi);
 440         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 441         unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
 442         unsigned int next;
 443
 444         spin_lock(&free_i->segmap_lock);
 445         if (test_and_clear_bit(segno, free_i->free_segmap)) {
 446                 free_i->free_segments++;
 447
 448                 if (IS_CURSEC(sbi, secno))
 449                         goto skip_free;
 450                 next = find_next_bit(free_i->free_segmap,
 451                                 start_segno + sbi->segs_per_sec, start_segno);
 452                 if (next >= start_segno + sbi->segs_per_sec) {
 453                         if (test_and_clear_bit(secno, free_i->free_secmap))
 454                                 free_i->free_sections++;
 455                 }
 456         }
 457 skip_free:
 458         spin_unlock(&free_i->segmap_lock);
 459 }
 460
 461 static inline void __set_test_and_inuse(struct f2fs_sb_info *sbi,
 462                 unsigned int segno)
 463 {
 464         struct free_segmap_info *free_i = FREE_I(sbi);
 465         unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 466
 467         spin_lock(&free_i->segmap_lock);
 468         if (!test_and_set_bit(segno, free_i->free_segmap)) {
 469                 free_i->free_segments--;
 470                 if (!test_and_set_bit(secno, free_i->free_secmap))
 471                         free_i->free_sections--;
 472         }
 473         spin_unlock(&free_i->segmap_lock);
 474 }
 475
 476 static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
 477                 void *dst_addr)
 478 {
 479         struct sit_info *sit_i = SIT_I(sbi);
 480
 481 #ifdef CONFIG_F2FS_CHECK_FS
 482         if (memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
 483                                                 sit_i->bitmap_size))
 484                 f2fs_bug_on(sbi, 1);
 485 #endif
 486         memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
 487 }
 488
 489 static inline block_t written_block_count(struct f2fs_sb_info *sbi)
 490 {
 491         return SIT_I(sbi)->written_valid_blocks;
 492 }
 493
 494 static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
 495 {
 496         return FREE_I(sbi)->free_segments;
 497 }
 498
 499 static inline int reserved_segments(struct f2fs_sb_info *sbi)
 500 {
 501         return SM_I(sbi)->reserved_segments;
 502 }
 503
 504 static inline unsigned int free_sections(struct f2fs_sb_info *sbi)
 505 {
 506         return FREE_I(sbi)->free_sections;
 507 }
 508
 509 static inline unsigned int prefree_segments(struct f2fs_sb_info *sbi)
 510 {
 511         return DIRTY_I(sbi)->nr_dirty[PRE];
 512 }
 513
 514 static inline unsigned int dirty_segments(struct f2fs_sb_info *sbi)
 515 {
 516         return DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_DATA] +
 517                 DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_DATA] +
 518                 DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_DATA] +
 519                 DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_NODE] +
 520                 DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_NODE] +
 521                 DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_NODE];
 522 }
 523
 524 static inline int overprovision_segments(struct f2fs_sb_info *sbi)
 525 {
 526         return SM_I(sbi)->ovp_segments;
 527 }
 528
 529 static inline int reserved_sections(struct f2fs_sb_info *sbi)
 530 {
 531         return GET_SEC_FROM_SEG(sbi, (unsigned int)reserved_segments(sbi));
 532 }
 533
 534 static inline bool has_curseg_enough_space(struct f2fs_sb_info *sbi)
 535 {
 536         unsigned int node_blocks = get_pages(sbi, F2FS_DIRTY_NODES) +
 537                                         get_pages(sbi, F2FS_DIRTY_DENTS);
 538         unsigned int dent_blocks = get_pages(sbi, F2FS_DIRTY_DENTS);
 539         unsigned int segno, left_blocks;
 540         int i;
 541
 542         /* check current node segment */
 543         for (i = CURSEG_HOT_NODE; i <= CURSEG_COLD_NODE; i++) {
 544                 segno = CURSEG_I(sbi, i)->segno;
 545                 left_blocks = sbi->blocks_per_seg -
 546                         get_seg_entry(sbi, segno)->ckpt_valid_blocks;
 547
 548                 if (node_blocks > left_blocks)
 549                         return false;
 550         }
 551
 552         /* check current data segment */
 553         segno = CURSEG_I(sbi, CURSEG_HOT_DATA)->segno;
 554         left_blocks = sbi->blocks_per_seg -
 555                         get_seg_entry(sbi, segno)->ckpt_valid_blocks;
 556         if (dent_blocks > left_blocks)
 557                 return false;
 558         return true;
 559 }
 560
 561 static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi,
 562                                         int freed, int needed)
 563 {
 564         int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
 565         int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
 566         int imeta_secs = get_blocktype_secs(sbi, F2FS_DIRTY_IMETA);
 567
 568         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 569                 return false;
 570
 571         if (free_sections(sbi) + freed == reserved_sections(sbi) + needed &&
 572                         has_curseg_enough_space(sbi))
 573                 return false;
 574         return (free_sections(sbi) + freed) <=
 575                 (node_secs + 2 * dent_secs + imeta_secs +
 576                 reserved_sections(sbi) + needed);
 577 }
 578
 579 static inline bool f2fs_is_checkpoint_ready(struct f2fs_sb_info *sbi)
 580 {
 581         if (likely(!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
 582                 return true;
 583         if (likely(!has_not_enough_free_secs(sbi, 0, 0)))
 584                 return true;
 585         return false;
 586 }
 587
 588 static inline bool excess_prefree_segs(struct f2fs_sb_info *sbi)
 589 {
 590         return prefree_segments(sbi) > SM_I(sbi)->rec_prefree_segments;
 591 }
 592
 593 static inline int utilization(struct f2fs_sb_info *sbi)
 594 {
 595         return div_u64((u64)valid_user_blocks(sbi) * 100,
 596                                         sbi->user_block_count);
 597 }
 598
 599 /*
 600  * Sometimes f2fs may be better to drop out-of-place update policy.
 601  * And, users can control the policy through sysfs entries.
 602  * There are five policies with triggering conditions as follows.
 603  * F2FS_IPU_FORCE - all the time,
 604  * F2FS_IPU_SSR - if SSR mode is activated,
 605  * F2FS_IPU_UTIL - if FS utilization is over threashold,
 606  * F2FS_IPU_SSR_UTIL - if SSR mode is activated and FS utilization is over
 607  *                     threashold,
 608  * F2FS_IPU_FSYNC - activated in fsync path only for high performance flash
 609  *                     storages. IPU will be triggered only if the # of dirty
 610  *                     pages over min_fsync_blocks. (=default option)
 611  * F2FS_IPU_ASYNC - do IPU given by asynchronous write requests.
 612  * F2FS_IPU_NOCACHE - disable IPU bio cache.
 613  * F2FS_IPUT_DISABLE - disable IPU. (=default option in LFS mode)
 614  */
 615 #define DEF_MIN_IPU_UTIL        70
 616 #define DEF_MIN_FSYNC_BLOCKS    8
 617 #define DEF_MIN_HOT_BLOCKS      16
 618
 619 #define SMALL_VOLUME_SEGMENTS   (16 * 512)      /* 16GB */
 620
 621 enum {
 622         F2FS_IPU_FORCE,
 623         F2FS_IPU_SSR,
 624         F2FS_IPU_UTIL,
 625         F2FS_IPU_SSR_UTIL,
 626         F2FS_IPU_FSYNC,
 627         F2FS_IPU_ASYNC,
 628         F2FS_IPU_NOCACHE,
 629 };
 630
 631 static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
 632                 int type)
 633 {
 634         struct curseg_info *curseg = CURSEG_I(sbi, type);
 635         return curseg->segno;
 636 }
 637
 638 static inline unsigned char curseg_alloc_type(struct f2fs_sb_info *sbi,
 639                 int type)
 640 {
 641         struct curseg_info *curseg = CURSEG_I(sbi, type);
 642         return curseg->alloc_type;
 643 }
 644
 645 static inline unsigned short curseg_blkoff(struct f2fs_sb_info *sbi, int type)
 646 {
 647         struct curseg_info *curseg = CURSEG_I(sbi, type);
 648         return curseg->next_blkoff;
 649 }
 650
 651 static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
 652 {
 653         f2fs_bug_on(sbi, segno > TOTAL_SEGS(sbi) - 1);
 654 }
 655
 656 static inline void verify_fio_blkaddr(struct f2fs_io_info *fio)
 657 {
 658         struct f2fs_sb_info *sbi = fio->sbi;
 659
 660         if (__is_valid_data_blkaddr(fio->old_blkaddr))
 661                 verify_blkaddr(sbi, fio->old_blkaddr, __is_meta_io(fio) ?
 662                                         META_GENERIC : DATA_GENERIC);
 663         verify_blkaddr(sbi, fio->new_blkaddr, __is_meta_io(fio) ?
 664                                         META_GENERIC : DATA_GENERIC_ENHANCE);
 665 }
 666
 667 /*
 668  * Summary block is always treated as an invalid block
 669  */
 670 static inline int check_block_count(struct f2fs_sb_info *sbi,
 671                 int segno, struct f2fs_sit_entry *raw_sit)
 672 {
 673         bool is_valid  = test_bit_le(0, raw_sit->valid_map) ? true : false;
 674         int valid_blocks = 0;
 675         int cur_pos = 0, next_pos;
 676
 677         /* check bitmap with valid block count */
 678         do {
 679                 if (is_valid) {
 680                         next_pos = find_next_zero_bit_le(&raw_sit->valid_map,
 681                                         sbi->blocks_per_seg,
 682                                         cur_pos);
 683                         valid_blocks += next_pos - cur_pos;
 684                 } else
 685                         next_pos = find_next_bit_le(&raw_sit->valid_map,
 686                                         sbi->blocks_per_seg,
 687                                         cur_pos);
 688                 cur_pos = next_pos;
 689                 is_valid = !is_valid;
 690         } while (cur_pos < sbi->blocks_per_seg);
 691
 692         if (unlikely(GET_SIT_VBLOCKS(raw_sit) != valid_blocks)) {
 693                 f2fs_err(sbi, "Mismatch valid blocks %d vs. %d",
 694                          GET_SIT_VBLOCKS(raw_sit), valid_blocks);
 695                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 696                 return -EFSCORRUPTED;
 697         }
 698
 699         /* check segment usage, and check boundary of a given segment number */
 700         if (unlikely(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg
 701                                         || segno > TOTAL_SEGS(sbi) - 1)) {
 702                 f2fs_err(sbi, "Wrong valid blocks %d or segno %u",
 703                          GET_SIT_VBLOCKS(raw_sit), segno);
 704                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 705                 return -EFSCORRUPTED;
 706         }
 707         return 0;
 708 }
 709
 710 static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
 711                                                 unsigned int start)
 712 {
 713         struct sit_info *sit_i = SIT_I(sbi);
 714         unsigned int offset = SIT_BLOCK_OFFSET(start);
 715         block_t blk_addr = sit_i->sit_base_addr + offset;
 716
 717         check_seg_range(sbi, start);
 718
 719 #ifdef CONFIG_F2FS_CHECK_FS
 720         if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
 721                         f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
 722                 f2fs_bug_on(sbi, 1);
 723 #endif
 724
 725         /* calculate sit block address */
 726         if (f2fs_test_bit(offset, sit_i->sit_bitmap))
 727                 blk_addr += sit_i->sit_blocks;
 728
 729         return blk_addr;
 730 }
 731
 732 static inline pgoff_t next_sit_addr(struct f2fs_sb_info *sbi,
 733                                                 pgoff_t block_addr)
 734 {
 735         struct sit_info *sit_i = SIT_I(sbi);
 736         block_addr -= sit_i->sit_base_addr;
 737         if (block_addr < sit_i->sit_blocks)
 738                 block_addr += sit_i->sit_blocks;
 739         else
 740                 block_addr -= sit_i->sit_blocks;
 741
 742         return block_addr + sit_i->sit_base_addr;
 743 }
 744
 745 static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
 746 {
 747         unsigned int block_off = SIT_BLOCK_OFFSET(start);
 748
 749         f2fs_change_bit(block_off, sit_i->sit_bitmap);
 750 #ifdef CONFIG_F2FS_CHECK_FS
 751         f2fs_change_bit(block_off, sit_i->sit_bitmap_mir);
 752 #endif
 753 }
 754
 755 static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi,
 756                                                 bool base_time)
 757 {
 758         struct sit_info *sit_i = SIT_I(sbi);
 759         time64_t diff, now = ktime_get_real_seconds();
 760
 761         if (now >= sit_i->mounted_time)
 762                 return sit_i->elapsed_time + now - sit_i->mounted_time;
 763
 764         /* system time is set to the past */
 765         if (!base_time) {
 766                 diff = sit_i->mounted_time - now;
 767                 if (sit_i->elapsed_time >= diff)
 768                         return sit_i->elapsed_time - diff;
 769                 return 0;
 770         }
 771         return sit_i->elapsed_time;
 772 }
 773
 774 static inline void set_summary(struct f2fs_summary *sum, nid_t nid,
 775                         unsigned int ofs_in_node, unsigned char version)
 776 {
 777         sum->nid = cpu_to_le32(nid);
 778         sum->ofs_in_node = cpu_to_le16(ofs_in_node);
 779         sum->version = version;
 780 }
 781
 782 static inline block_t start_sum_block(struct f2fs_sb_info *sbi)
 783 {
 784         return __start_cp_addr(sbi) +
 785                 le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
 786 }
 787
 788 static inline block_t sum_blk_addr(struct f2fs_sb_info *sbi, int base, int type)
 789 {
 790         return __start_cp_addr(sbi) +
 791                 le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_total_block_count)
 792                                 - (base + 1) + type;
 793 }
 794
 795 static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
 796 {
 797         if (IS_CURSEC(sbi, secno) || (sbi->cur_victim_sec == secno))
 798                 return true;
 799         return false;
 800 }
 801
 802 /*
 803  * It is very important to gather dirty pages and write at once, so that we can
 804  * submit a big bio without interfering other data writes.
 805  * By default, 512 pages for directory data,
 806  * 512 pages (2MB) * 8 for nodes, and
 807  * 256 pages * 8 for meta are set.
 808  */
 809 static inline int nr_pages_to_skip(struct f2fs_sb_info *sbi, int type)
 810 {
 811         if (sbi->sb->s_bdi->wb.dirty_exceeded)
 812                 return 0;
 813
 814         if (type == DATA)
 815                 return sbi->blocks_per_seg;
 816         else if (type == NODE)
 817                 return 8 * sbi->blocks_per_seg;
 818         else if (type == META)
 819                 return 8 * BIO_MAX_PAGES;
 820         else
 821                 return 0;
 822 }
 823
 824 /*
 825  * When writing pages, it'd better align nr_to_write for segment size.
 826  */
 827 static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
 828                                         struct writeback_control *wbc)
 829 {
 830         long nr_to_write, desired;
 831
 832         if (wbc->sync_mode != WB_SYNC_NONE)
 833                 return 0;
 834
 835         nr_to_write = wbc->nr_to_write;
 836         desired = BIO_MAX_PAGES;
 837         if (type == NODE)
 838                 desired <<= 1;
 839
 840         wbc->nr_to_write = desired;
 841         return desired - nr_to_write;
 842 }
 843
 844 static inline void wake_up_discard_thread(struct f2fs_sb_info *sbi, bool force)
 845 {
 846         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 847         bool wakeup = false;
 848         int i;
 849
 850         if (force)
 851                 goto wake_up;
 852
 853         mutex_lock(&dcc->cmd_lock);
 854         for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
 855                 if (i + 1 < dcc->discard_granularity)
 856                         break;
 857                 if (!list_empty(&dcc->pend_list[i])) {
 858                         wakeup = true;
 859                         break;
 860                 }
 861         }
 862         mutex_unlock(&dcc->cmd_lock);
 863         if (!wakeup || !is_idle(sbi, DISCARD_TIME))
 864                 return;
 865 wake_up:
 866         dcc->discard_wake = 1;
 867         wake_up_interruptible_all(&dcc->discard_wait_queue);
 868 }