fs/f2fs/segment.h

   1 /*
   2  * fs/f2fs/segment.h
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/blkdev.h>
  12
  13 /* constant macro */
  14 #define NULL_SEGNO                      ((unsigned int)(~0))
  15 #define NULL_SECNO                      ((unsigned int)(~0))
  16
  17 /* L: Logical segment # in volume, R: Relative segment # in main area */
  18 #define GET_L2R_SEGNO(free_i, segno)    (segno - free_i->start_segno)
  19 #define GET_R2L_SEGNO(free_i, segno)    (segno + free_i->start_segno)
  20
  21 #define IS_DATASEG(t)                                                   \
  22         ((t == CURSEG_HOT_DATA) || (t == CURSEG_COLD_DATA) ||           \
  23         (t == CURSEG_WARM_DATA))
  24
  25 #define IS_NODESEG(t)                                                   \
  26         ((t == CURSEG_HOT_NODE) || (t == CURSEG_COLD_NODE) ||           \
  27         (t == CURSEG_WARM_NODE))
  28
  29 #define IS_CURSEG(sbi, seg)                                             \
  30         ((seg == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno) ||      \
  31          (seg == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno) ||     \
  32          (seg == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) ||     \
  33          (seg == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) ||      \
  34          (seg == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) ||     \
  35          (seg == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno))
  36
  37 #define IS_CURSEC(sbi, secno)                                           \
  38         ((secno == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno /              \
  39           sbi->segs_per_sec) || \
  40          (secno == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno /             \
  41           sbi->segs_per_sec) || \
  42          (secno == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno /             \
  43           sbi->segs_per_sec) || \
  44          (secno == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno /              \
  45           sbi->segs_per_sec) || \
  46          (secno == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno /             \
  47           sbi->segs_per_sec) || \
  48          (secno == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /             \
  49           sbi->segs_per_sec))   \
  50
  51 #define START_BLOCK(sbi, segno)                                         \
  52         (SM_I(sbi)->seg0_blkaddr +                                      \
  53          (GET_R2L_SEGNO(FREE_I(sbi), segno) << sbi->log_blocks_per_seg))
  54 #define NEXT_FREE_BLKADDR(sbi, curseg)                                  \
  55         (START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff)
  56
  57 #define MAIN_BASE_BLOCK(sbi)    (SM_I(sbi)->main_blkaddr)
  58
  59 #define GET_SEGOFF_FROM_SEG0(sbi, blk_addr)                             \
  60         ((blk_addr) - SM_I(sbi)->seg0_blkaddr)
  61 #define GET_SEGNO_FROM_SEG0(sbi, blk_addr)                              \
  62         (GET_SEGOFF_FROM_SEG0(sbi, blk_addr) >> sbi->log_blocks_per_seg)
  63 #define GET_SEGNO(sbi, blk_addr)                                        \
  64         (((blk_addr == NULL_ADDR) || (blk_addr == NEW_ADDR)) ?          \
  65         NULL_SEGNO : GET_L2R_SEGNO(FREE_I(sbi),                 \
  66                 GET_SEGNO_FROM_SEG0(sbi, blk_addr)))
  67 #define GET_SECNO(sbi, segno)                                   \
  68         ((segno) / sbi->segs_per_sec)
  69 #define GET_ZONENO_FROM_SEGNO(sbi, segno)                               \
  70         ((segno / sbi->segs_per_sec) / sbi->secs_per_zone)
  71
  72 #define GET_SUM_BLOCK(sbi, segno)                               \
  73         ((sbi->sm_info->ssa_blkaddr) + segno)
  74
  75 #define GET_SUM_TYPE(footer) ((footer)->entry_type)
  76 #define SET_SUM_TYPE(footer, type) ((footer)->entry_type = type)
  77
  78 #define SIT_ENTRY_OFFSET(sit_i, segno)                                  \
  79         (segno % sit_i->sents_per_block)
  80 #define SIT_BLOCK_OFFSET(sit_i, segno)                                  \
  81         (segno / SIT_ENTRY_PER_BLOCK)
  82 #define START_SEGNO(sit_i, segno)               \
  83         (SIT_BLOCK_OFFSET(sit_i, segno) * SIT_ENTRY_PER_BLOCK)
  84 #define f2fs_bitmap_size(nr)                    \
  85         (BITS_TO_LONGS(nr) * sizeof(unsigned long))
  86 #define TOTAL_SEGS(sbi) (SM_I(sbi)->main_segments)
  87 #define TOTAL_SECS(sbi) (sbi->total_sections)
  88
  89 #define SECTOR_FROM_BLOCK(sbi, blk_addr)                                \
  90         (blk_addr << ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
  91 #define SECTOR_TO_BLOCK(sbi, sectors)                                   \
  92         (sectors >> ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
  93
  94 /* during checkpoint, bio_private is used to synchronize the last bio */
  95 struct bio_private {
  96         struct f2fs_sb_info *sbi;
  97         bool is_sync;
  98         void *wait;
  99 };
 100
 101 /*
 102  * indicate a block allocation direction: RIGHT and LEFT.
 103  * RIGHT means allocating new sections towards the end of volume.
 104  * LEFT means the opposite direction.
 105  */
 106 enum {
 107         ALLOC_RIGHT = 0,
 108         ALLOC_LEFT
 109 };
 110
 111 /*
 112  * In the victim_sel_policy->alloc_mode, there are two block allocation modes.
 113  * LFS writes data sequentially with cleaning operations.
 114  * SSR (Slack Space Recycle) reuses obsolete space without cleaning operations.
 115  */
 116 enum {
 117         LFS = 0,
 118         SSR
 119 };
 120
 121 /*
 122  * In the victim_sel_policy->gc_mode, there are two gc, aka cleaning, modes.
 123  * GC_CB is based on cost-benefit algorithm.
 124  * GC_GREEDY is based on greedy algorithm.
 125  */
 126 enum {
 127         GC_CB = 0,
 128         GC_GREEDY
 129 };
 130
 131 /*
 132  * BG_GC means the background cleaning job.
 133  * FG_GC means the on-demand cleaning job.
 134  */
 135 enum {
 136         BG_GC = 0,
 137         FG_GC
 138 };
 139
 140 /* for a function parameter to select a victim segment */
 141 struct victim_sel_policy {
 142         int alloc_mode;                 /* LFS or SSR */
 143         int gc_mode;                    /* GC_CB or GC_GREEDY */
 144         unsigned long *dirty_segmap;    /* dirty segment bitmap */
 145         unsigned int offset;            /* last scanned bitmap offset */
 146         unsigned int ofs_unit;          /* bitmap search unit */
 147         unsigned int min_cost;          /* minimum cost */
 148         unsigned int min_segno;         /* segment # having min. cost */
 149 };
 150
 151 struct seg_entry {
 152         unsigned short valid_blocks;    /* # of valid blocks */
 153         unsigned char *cur_valid_map;   /* validity bitmap of blocks */
 154         /*
 155          * # of valid blocks and the validity bitmap stored in the the last
 156          * checkpoint pack. This information is used by the SSR mode.
 157          */
 158         unsigned short ckpt_valid_blocks;
 159         unsigned char *ckpt_valid_map;
 160         unsigned char type;             /* segment type like CURSEG_XXX_TYPE */
 161         unsigned long long mtime;       /* modification time of the segment */
 162 };
 163
 164 struct sec_entry {
 165         unsigned int valid_blocks;      /* # of valid blocks in a section */
 166 };
 167
 168 struct segment_allocation {
 169         void (*allocate_segment)(struct f2fs_sb_info *, int, bool);
 170 };
 171
 172 struct sit_info {
 173         const struct segment_allocation *s_ops;
 174
 175         block_t sit_base_addr;          /* start block address of SIT area */
 176         block_t sit_blocks;             /* # of blocks used by SIT area */
 177         block_t written_valid_blocks;   /* # of valid blocks in main area */
 178         char *sit_bitmap;               /* SIT bitmap pointer */
 179         unsigned int bitmap_size;       /* SIT bitmap size */
 180
 181         unsigned long *dirty_sentries_bitmap;   /* bitmap for dirty sentries */
 182         unsigned int dirty_sentries;            /* # of dirty sentries */
 183         unsigned int sents_per_block;           /* # of SIT entries per block */
 184         struct mutex sentry_lock;               /* to protect SIT cache */
 185         struct seg_entry *sentries;             /* SIT segment-level cache */
 186         struct sec_entry *sec_entries;          /* SIT section-level cache */
 187
 188         /* for cost-benefit algorithm in cleaning procedure */
 189         unsigned long long elapsed_time;        /* elapsed time after mount */
 190         unsigned long long mounted_time;        /* mount time */
 191         unsigned long long min_mtime;           /* min. modification time */
 192         unsigned long long max_mtime;           /* max. modification time */
 193 };
 194
 195 struct free_segmap_info {
 196         unsigned int start_segno;       /* start segment number logically */
 197         unsigned int free_segments;     /* # of free segments */
 198         unsigned int free_sections;     /* # of free sections */
 199         rwlock_t segmap_lock;           /* free segmap lock */
 200         unsigned long *free_segmap;     /* free segment bitmap */
 201         unsigned long *free_secmap;     /* free section bitmap */
 202 };
 203
 204 /* Notice: The order of dirty type is same with CURSEG_XXX in f2fs.h */
 205 enum dirty_type {
 206         DIRTY_HOT_DATA,         /* dirty segments assigned as hot data logs */
 207         DIRTY_WARM_DATA,        /* dirty segments assigned as warm data logs */
 208         DIRTY_COLD_DATA,        /* dirty segments assigned as cold data logs */
 209         DIRTY_HOT_NODE,         /* dirty segments assigned as hot node logs */
 210         DIRTY_WARM_NODE,        /* dirty segments assigned as warm node logs */
 211         DIRTY_COLD_NODE,        /* dirty segments assigned as cold node logs */
 212         DIRTY,                  /* to count # of dirty segments */
 213         PRE,                    /* to count # of entirely obsolete segments */
 214         NR_DIRTY_TYPE
 215 };
 216
 217 struct dirty_seglist_info {
 218         const struct victim_selection *v_ops;   /* victim selction operation */
 219         unsigned long *dirty_segmap[NR_DIRTY_TYPE];
 220         struct mutex seglist_lock;              /* lock for segment bitmaps */
 221         int nr_dirty[NR_DIRTY_TYPE];            /* # of dirty segments */
 222         unsigned long *victim_secmap;           /* background GC victims */
 223 };
 224
 225 /* victim selection function for cleaning and SSR */
 226 struct victim_selection {
 227         int (*get_victim)(struct f2fs_sb_info *, unsigned int *,
 228                                                         int, int, char);
 229 };
 230
 231 /* for active log information */
 232 struct curseg_info {
 233         struct mutex curseg_mutex;              /* lock for consistency */
 234         struct f2fs_summary_block *sum_blk;     /* cached summary block */
 235         unsigned char alloc_type;               /* current allocation type */
 236         unsigned int segno;                     /* current segment number */
 237         unsigned short next_blkoff;             /* next block offset to write */
 238         unsigned int zone;                      /* current zone number */
 239         unsigned int next_segno;                /* preallocated segment */
 240 };
 241
 242 /*
 243  * inline functions
 244  */
 245 static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
 246 {
 247         return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
 248 }
 249
 250 static inline struct seg_entry *get_seg_entry(struct f2fs_sb_info *sbi,
 251                                                 unsigned int segno)
 252 {
 253         struct sit_info *sit_i = SIT_I(sbi);
 254         return &sit_i->sentries[segno];
 255 }
 256
 257 static inline struct sec_entry *get_sec_entry(struct f2fs_sb_info *sbi,
 258                                                 unsigned int segno)
 259 {
 260         struct sit_info *sit_i = SIT_I(sbi);
 261         return &sit_i->sec_entries[GET_SECNO(sbi, segno)];
 262 }
 263
 264 static inline unsigned int get_valid_blocks(struct f2fs_sb_info *sbi,
 265                                 unsigned int segno, int section)
 266 {
 267         /*
 268          * In order to get # of valid blocks in a section instantly from many
 269          * segments, f2fs manages two counting structures separately.
 270          */
 271         if (section > 1)
 272                 return get_sec_entry(sbi, segno)->valid_blocks;
 273         else
 274                 return get_seg_entry(sbi, segno)->valid_blocks;
 275 }
 276
 277 static inline void seg_info_from_raw_sit(struct seg_entry *se,
 278                                         struct f2fs_sit_entry *rs)
 279 {
 280         se->valid_blocks = GET_SIT_VBLOCKS(rs);
 281         se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);
 282         memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 283         memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 284         se->type = GET_SIT_TYPE(rs);
 285         se->mtime = le64_to_cpu(rs->mtime);
 286 }
 287
 288 static inline void seg_info_to_raw_sit(struct seg_entry *se,
 289                                         struct f2fs_sit_entry *rs)
 290 {
 291         unsigned short raw_vblocks = (se->type << SIT_VBLOCKS_SHIFT) |
 292                                         se->valid_blocks;
 293         rs->vblocks = cpu_to_le16(raw_vblocks);
 294         memcpy(rs->valid_map, se->cur_valid_map, SIT_VBLOCK_MAP_SIZE);
 295         memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 296         se->ckpt_valid_blocks = se->valid_blocks;
 297         rs->mtime = cpu_to_le64(se->mtime);
 298 }
 299
 300 static inline unsigned int find_next_inuse(struct free_segmap_info *free_i,
 301                 unsigned int max, unsigned int segno)
 302 {
 303         unsigned int ret;
 304         read_lock(&free_i->segmap_lock);
 305         ret = find_next_bit(free_i->free_segmap, max, segno);
 306         read_unlock(&free_i->segmap_lock);
 307         return ret;
 308 }
 309
 310 static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
 311 {
 312         struct free_segmap_info *free_i = FREE_I(sbi);
 313         unsigned int secno = segno / sbi->segs_per_sec;
 314         unsigned int start_segno = secno * sbi->segs_per_sec;
 315         unsigned int next;
 316
 317         write_lock(&free_i->segmap_lock);
 318         clear_bit(segno, free_i->free_segmap);
 319         free_i->free_segments++;
 320
 321         next = find_next_bit(free_i->free_segmap, TOTAL_SEGS(sbi), start_segno);
 322         if (next >= start_segno + sbi->segs_per_sec) {
 323                 clear_bit(secno, free_i->free_secmap);
 324                 free_i->free_sections++;
 325         }
 326         write_unlock(&free_i->segmap_lock);
 327 }
 328
 329 static inline void __set_inuse(struct f2fs_sb_info *sbi,
 330                 unsigned int segno)
 331 {
 332         struct free_segmap_info *free_i = FREE_I(sbi);
 333         unsigned int secno = segno / sbi->segs_per_sec;
 334         set_bit(segno, free_i->free_segmap);
 335         free_i->free_segments--;
 336         if (!test_and_set_bit(secno, free_i->free_secmap))
 337                 free_i->free_sections--;
 338 }
 339
 340 static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
 341                 unsigned int segno)
 342 {
 343         struct free_segmap_info *free_i = FREE_I(sbi);
 344         unsigned int secno = segno / sbi->segs_per_sec;
 345         unsigned int start_segno = secno * sbi->segs_per_sec;
 346         unsigned int next;
 347
 348         write_lock(&free_i->segmap_lock);
 349         if (test_and_clear_bit(segno, free_i->free_segmap)) {
 350                 free_i->free_segments++;
 351
 352                 next = find_next_bit(free_i->free_segmap, TOTAL_SEGS(sbi),
 353                                                                 start_segno);
 354                 if (next >= start_segno + sbi->segs_per_sec) {
 355                         if (test_and_clear_bit(secno, free_i->free_secmap))
 356                                 free_i->free_sections++;
 357                 }
 358         }
 359         write_unlock(&free_i->segmap_lock);
 360 }
 361
 362 static inline void __set_test_and_inuse(struct f2fs_sb_info *sbi,
 363                 unsigned int segno)
 364 {
 365         struct free_segmap_info *free_i = FREE_I(sbi);
 366         unsigned int secno = segno / sbi->segs_per_sec;
 367         write_lock(&free_i->segmap_lock);
 368         if (!test_and_set_bit(segno, free_i->free_segmap)) {
 369                 free_i->free_segments--;
 370                 if (!test_and_set_bit(secno, free_i->free_secmap))
 371                         free_i->free_sections--;
 372         }
 373         write_unlock(&free_i->segmap_lock);
 374 }
 375
 376 static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
 377                 void *dst_addr)
 378 {
 379         struct sit_info *sit_i = SIT_I(sbi);
 380         memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
 381 }
 382
 383 static inline block_t written_block_count(struct f2fs_sb_info *sbi)
 384 {
 385         struct sit_info *sit_i = SIT_I(sbi);
 386         block_t vblocks;
 387
 388         mutex_lock(&sit_i->sentry_lock);
 389         vblocks = sit_i->written_valid_blocks;
 390         mutex_unlock(&sit_i->sentry_lock);
 391
 392         return vblocks;
 393 }
 394
 395 static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
 396 {
 397         struct free_segmap_info *free_i = FREE_I(sbi);
 398         unsigned int free_segs;
 399
 400         read_lock(&free_i->segmap_lock);
 401         free_segs = free_i->free_segments;
 402         read_unlock(&free_i->segmap_lock);
 403
 404         return free_segs;
 405 }
 406
 407 static inline int reserved_segments(struct f2fs_sb_info *sbi)
 408 {
 409         return SM_I(sbi)->reserved_segments;
 410 }
 411
 412 static inline unsigned int free_sections(struct f2fs_sb_info *sbi)
 413 {
 414         struct free_segmap_info *free_i = FREE_I(sbi);
 415         unsigned int free_secs;
 416
 417         read_lock(&free_i->segmap_lock);
 418         free_secs = free_i->free_sections;
 419         read_unlock(&free_i->segmap_lock);
 420
 421         return free_secs;
 422 }
 423
 424 static inline unsigned int prefree_segments(struct f2fs_sb_info *sbi)
 425 {
 426         return DIRTY_I(sbi)->nr_dirty[PRE];
 427 }
 428
 429 static inline unsigned int dirty_segments(struct f2fs_sb_info *sbi)
 430 {
 431         return DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_DATA] +
 432                 DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_DATA] +
 433                 DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_DATA] +
 434                 DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_NODE] +
 435                 DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_NODE] +
 436                 DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_NODE];
 437 }
 438
 439 static inline int overprovision_segments(struct f2fs_sb_info *sbi)
 440 {
 441         return SM_I(sbi)->ovp_segments;
 442 }
 443
 444 static inline int overprovision_sections(struct f2fs_sb_info *sbi)
 445 {
 446         return ((unsigned int) overprovision_segments(sbi)) / sbi->segs_per_sec;
 447 }
 448
 449 static inline int reserved_sections(struct f2fs_sb_info *sbi)
 450 {
 451         return ((unsigned int) reserved_segments(sbi)) / sbi->segs_per_sec;
 452 }
 453
 454 static inline bool need_SSR(struct f2fs_sb_info *sbi)
 455 {
 456         return (free_sections(sbi) < overprovision_sections(sbi));
 457 }
 458
 459 static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
 460 {
 461         int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
 462         int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
 463
 464         if (sbi->por_doing)
 465                 return false;
 466
 467         return ((free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +
 468                                                 reserved_sections(sbi)));
 469 }
 470
 471 static inline int utilization(struct f2fs_sb_info *sbi)
 472 {
 473         return div_u64(valid_user_blocks(sbi) * 100, sbi->user_block_count);
 474 }
 475
 476 /*
 477  * Sometimes f2fs may be better to drop out-of-place update policy.
 478  * So, if fs utilization is over MIN_IPU_UTIL, then f2fs tries to write
 479  * data in the original place likewise other traditional file systems.
 480  * But, currently set 100 in percentage, which means it is disabled.
 481  * See below need_inplace_update().
 482  */
 483 #define MIN_IPU_UTIL            100
 484 static inline bool need_inplace_update(struct inode *inode)
 485 {
 486         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 487         if (S_ISDIR(inode->i_mode))
 488                 return false;
 489         if (need_SSR(sbi) && utilization(sbi) > MIN_IPU_UTIL)
 490                 return true;
 491         return false;
 492 }
 493
 494 static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
 495                 int type)
 496 {
 497         struct curseg_info *curseg = CURSEG_I(sbi, type);
 498         return curseg->segno;
 499 }
 500
 501 static inline unsigned char curseg_alloc_type(struct f2fs_sb_info *sbi,
 502                 int type)
 503 {
 504         struct curseg_info *curseg = CURSEG_I(sbi, type);
 505         return curseg->alloc_type;
 506 }
 507
 508 static inline unsigned short curseg_blkoff(struct f2fs_sb_info *sbi, int type)
 509 {
 510         struct curseg_info *curseg = CURSEG_I(sbi, type);
 511         return curseg->next_blkoff;
 512 }
 513
 514 static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
 515 {
 516         unsigned int end_segno = SM_I(sbi)->segment_count - 1;
 517         BUG_ON(segno > end_segno);
 518 }
 519
 520 /*
 521  * This function is used for only debugging.
 522  * NOTE: In future, we have to remove this function.
 523  */
 524 static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
 525 {
 526         struct f2fs_sm_info *sm_info = SM_I(sbi);
 527         block_t total_blks = sm_info->segment_count << sbi->log_blocks_per_seg;
 528         block_t start_addr = sm_info->seg0_blkaddr;
 529         block_t end_addr = start_addr + total_blks - 1;
 530         BUG_ON(blk_addr < start_addr);
 531         BUG_ON(blk_addr > end_addr);
 532 }
 533
 534 /*
 535  * Summary block is always treated as invalid block
 536  */
 537 static inline void check_block_count(struct f2fs_sb_info *sbi,
 538                 int segno, struct f2fs_sit_entry *raw_sit)
 539 {
 540         struct f2fs_sm_info *sm_info = SM_I(sbi);
 541         unsigned int end_segno = sm_info->segment_count - 1;
 542         int valid_blocks = 0;
 543         int i;
 544
 545         /* check segment usage */
 546         BUG_ON(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg);
 547
 548         /* check boundary of a given segment number */
 549         BUG_ON(segno > end_segno);
 550
 551         /* check bitmap with valid block count */
 552         for (i = 0; i < sbi->blocks_per_seg; i++)
 553                 if (f2fs_test_bit(i, raw_sit->valid_map))
 554                         valid_blocks++;
 555         BUG_ON(GET_SIT_VBLOCKS(raw_sit) != valid_blocks);
 556 }
 557
 558 static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
 559                                                 unsigned int start)
 560 {
 561         struct sit_info *sit_i = SIT_I(sbi);
 562         unsigned int offset = SIT_BLOCK_OFFSET(sit_i, start);
 563         block_t blk_addr = sit_i->sit_base_addr + offset;
 564
 565         check_seg_range(sbi, start);
 566
 567         /* calculate sit block address */
 568         if (f2fs_test_bit(offset, sit_i->sit_bitmap))
 569                 blk_addr += sit_i->sit_blocks;
 570
 571         return blk_addr;
 572 }
 573
 574 static inline pgoff_t next_sit_addr(struct f2fs_sb_info *sbi,
 575                                                 pgoff_t block_addr)
 576 {
 577         struct sit_info *sit_i = SIT_I(sbi);
 578         block_addr -= sit_i->sit_base_addr;
 579         if (block_addr < sit_i->sit_blocks)
 580                 block_addr += sit_i->sit_blocks;
 581         else
 582                 block_addr -= sit_i->sit_blocks;
 583
 584         return block_addr + sit_i->sit_base_addr;
 585 }
 586
 587 static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
 588 {
 589         unsigned int block_off = SIT_BLOCK_OFFSET(sit_i, start);
 590
 591         if (f2fs_test_bit(block_off, sit_i->sit_bitmap))
 592                 f2fs_clear_bit(block_off, sit_i->sit_bitmap);
 593         else
 594                 f2fs_set_bit(block_off, sit_i->sit_bitmap);
 595 }
 596
 597 static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi)
 598 {
 599         struct sit_info *sit_i = SIT_I(sbi);
 600         return sit_i->elapsed_time + CURRENT_TIME_SEC.tv_sec -
 601                                                 sit_i->mounted_time;
 602 }
 603
 604 static inline void set_summary(struct f2fs_summary *sum, nid_t nid,
 605                         unsigned int ofs_in_node, unsigned char version)
 606 {
 607         sum->nid = cpu_to_le32(nid);
 608         sum->ofs_in_node = cpu_to_le16(ofs_in_node);
 609         sum->version = version;
 610 }
 611
 612 static inline block_t start_sum_block(struct f2fs_sb_info *sbi)
 613 {
 614         return __start_cp_addr(sbi) +
 615                 le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
 616 }
 617
 618 static inline block_t sum_blk_addr(struct f2fs_sb_info *sbi, int base, int type)
 619 {
 620         return __start_cp_addr(sbi) +
 621                 le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_total_block_count)
 622                                 - (base + 1) + type;
 623 }
 624
 625 static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
 626 {
 627         if (IS_CURSEC(sbi, secno) || (sbi->cur_victim_sec == secno))
 628                 return true;
 629         return false;
 630 }
 631
 632 static inline unsigned int max_hw_blocks(struct f2fs_sb_info *sbi)
 633 {
 634         struct block_device *bdev = sbi->sb->s_bdev;
 635         struct request_queue *q = bdev_get_queue(bdev);
 636         return SECTOR_TO_BLOCK(sbi, queue_max_sectors(q));
 637 }