/*
 * fs/f2fs/segment.h
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/* constant macro */
#define NULL_SEGNO                      ((unsigned int)(~0))

/* V: Logical segment # in volume, R: Relative segment # in main area */
#define GET_L2R_SEGNO(free_i, segno)    (segno - free_i->start_segno)
#define GET_R2L_SEGNO(free_i, segno)    (segno + free_i->start_segno)

#define IS_DATASEG(t)                                                   \
        ((t == CURSEG_HOT_DATA) || (t == CURSEG_COLD_DATA) ||           \
        (t == CURSEG_WARM_DATA))

#define IS_NODESEG(t)                                                   \
        ((t == CURSEG_HOT_NODE) || (t == CURSEG_COLD_NODE) ||           \
        (t == CURSEG_WARM_NODE))

#define IS_CURSEG(sbi, segno)                                           \
        ((segno == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno) ||    \
         (segno == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno) ||   \
         (segno == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) ||   \
         (segno == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) ||    \
         (segno == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) ||   \
         (segno == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno))

#define IS_CURSEC(sbi, secno)                                           \
        ((secno == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno /              \
          sbi->segs_per_sec) || \
         (secno == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno /             \
          sbi->segs_per_sec) || \
         (secno == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno /             \
          sbi->segs_per_sec) || \
         (secno == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno /              \
          sbi->segs_per_sec) || \
         (secno == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno /             \
          sbi->segs_per_sec) || \
         (secno == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /             \
          sbi->segs_per_sec))   \

#define START_BLOCK(sbi, segno)                                         \
        (SM_I(sbi)->seg0_blkaddr +                                      \
         (GET_R2L_SEGNO(FREE_I(sbi), segno) << sbi->log_blocks_per_seg))
#define NEXT_FREE_BLKADDR(sbi, curseg)                                  \
        (START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff)

#define MAIN_BASE_BLOCK(sbi)    (SM_I(sbi)->main_blkaddr)

#define GET_SEGOFF_FROM_SEG0(sbi, blk_addr)                             \
        ((blk_addr) - SM_I(sbi)->seg0_blkaddr)
#define GET_SEGNO_FROM_SEG0(sbi, blk_addr)                              \
        (GET_SEGOFF_FROM_SEG0(sbi, blk_addr) >> sbi->log_blocks_per_seg)
#define GET_SEGNO(sbi, blk_addr)                                        \
        (((blk_addr == NULL_ADDR) || (blk_addr == NEW_ADDR)) ?          \
        NULL_SEGNO : GET_L2R_SEGNO(FREE_I(sbi),                 \
                GET_SEGNO_FROM_SEG0(sbi, blk_addr)))
#define GET_SECNO(sbi, segno)                                   \
        ((segno) / sbi->segs_per_sec)
#define GET_ZONENO_FROM_SEGNO(sbi, segno)                               \
        ((segno / sbi->segs_per_sec) / sbi->secs_per_zone)

#define GET_SUM_BLOCK(sbi, segno)                               \
        ((sbi->sm_info->ssa_blkaddr) + segno)

#define GET_SUM_TYPE(footer) ((footer)->entry_type)
#define SET_SUM_TYPE(footer, type) ((footer)->entry_type = type)

#define SIT_ENTRY_OFFSET(sit_i, segno)                                  \
        (segno % sit_i->sents_per_block)
#define SIT_BLOCK_OFFSET(sit_i, segno)                                  \
        (segno / SIT_ENTRY_PER_BLOCK)
#define START_SEGNO(sit_i, segno)               \
        (SIT_BLOCK_OFFSET(sit_i, segno) * SIT_ENTRY_PER_BLOCK)
#define f2fs_bitmap_size(nr)                    \
        (BITS_TO_LONGS(nr) * sizeof(unsigned long))
#define TOTAL_SEGS(sbi) (SM_I(sbi)->main_segments)

#define SECTOR_FROM_BLOCK(sbi, blk_addr)                                \
        (blk_addr << ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))

/* during checkpoint, bio_private is used to synchronize the last bio */
struct bio_private {
        struct f2fs_sb_info *sbi;
        bool is_sync;
        void *wait;
};

/*
 * indicate a block allocation direction: RIGHT and LEFT.
 * RIGHT means allocating new sections towards the end of volume.
 * LEFT means the opposite direction.
 */
enum {
        ALLOC_RIGHT = 0,
        ALLOC_LEFT
};

/*
 * In the victim_sel_policy->alloc_mode, there are two block allocation modes.
 * LFS writes data sequentially with cleaning operations.
 * SSR (Slack Space Recycle) reuses obsolete space without cleaning operations.
 */
enum {
        LFS = 0,
        SSR
};

/*
 * In the victim_sel_policy->gc_mode, there are two gc, aka cleaning, modes.
 * GC_CB is based on cost-benefit algorithm.
 * GC_GREEDY is based on greedy algorithm.
 */
enum {
        GC_CB = 0,
        GC_GREEDY
};

/*
 * BG_GC means the background cleaning job.
 * FG_GC means the on-demand cleaning job.
 */
enum {
        BG_GC = 0,
        FG_GC
};

/* for a function parameter to select a victim segment */
struct victim_sel_policy {
        int alloc_mode;                 /* LFS or SSR */
        int gc_mode;                    /* GC_CB or GC_GREEDY */
        unsigned long *dirty_segmap;    /* dirty segment bitmap */
        unsigned int offset;            /* last scanned bitmap offset */
        unsigned int ofs_unit;          /* bitmap search unit */
        unsigned int min_cost;          /* minimum cost */
        unsigned int min_segno;         /* segment # having min. cost */
};

struct seg_entry {
        unsigned short valid_blocks;    /* # of valid blocks */
        unsigned char *cur_valid_map;   /* validity bitmap of blocks */
        /*
         * # of valid blocks and the validity bitmap stored in the the last
         * checkpoint pack. This information is used by the SSR mode.
         */
        unsigned short ckpt_valid_blocks;
        unsigned char *ckpt_valid_map;
        unsigned char type;             /* segment type like CURSEG_XXX_TYPE */
        unsigned long long mtime;       /* modification time of the segment */
};

struct sec_entry {
        unsigned int valid_blocks;      /* # of valid blocks in a section */
};

struct segment_allocation {
        void (*allocate_segment)(struct f2fs_sb_info *, int, bool);
};

struct sit_info {
        const struct segment_allocation *s_ops;

        block_t sit_base_addr;          /* start block address of SIT area */
        block_t sit_blocks;             /* # of blocks used by SIT area */
        block_t written_valid_blocks;   /* # of valid blocks in main area */
        char *sit_bitmap;               /* SIT bitmap pointer */
        unsigned int bitmap_size;       /* SIT bitmap size */

        unsigned long *dirty_sentries_bitmap;   /* bitmap for dirty sentries */
        unsigned int dirty_sentries;            /* # of dirty sentries */
        unsigned int sents_per_block;           /* # of SIT entries per block */
        struct mutex sentry_lock;               /* to protect SIT cache */
        struct seg_entry *sentries;             /* SIT segment-level cache */
        struct sec_entry *sec_entries;          /* SIT section-level cache */

        /* for cost-benefit algorithm in cleaning procedure */
        unsigned long long elapsed_time;        /* elapsed time after mount */
        unsigned long long mounted_time;        /* mount time */
        unsigned long long min_mtime;           /* min. modification time */
        unsigned long long max_mtime;           /* max. modification time */
};

struct free_segmap_info {
        unsigned int start_segno;       /* start segment number logically */
        unsigned int free_segments;     /* # of free segments */
        unsigned int free_sections;     /* # of free sections */
        rwlock_t segmap_lock;           /* free segmap lock */
        unsigned long *free_segmap;     /* free segment bitmap */
        unsigned long *free_secmap;     /* free section bitmap */
};

/* Notice: The order of dirty type is same with CURSEG_XXX in f2fs.h */
enum dirty_type {
        DIRTY_HOT_DATA,         /* dirty segments assigned as hot data logs */
        DIRTY_WARM_DATA,        /* dirty segments assigned as warm data logs */
        DIRTY_COLD_DATA,        /* dirty segments assigned as cold data logs */
        DIRTY_HOT_NODE,         /* dirty segments assigned as hot node logs */
        DIRTY_WARM_NODE,        /* dirty segments assigned as warm node logs */
        DIRTY_COLD_NODE,        /* dirty segments assigned as cold node logs */
        DIRTY,                  /* to count # of dirty segments */
        PRE,                    /* to count # of entirely obsolete segments */
        NR_DIRTY_TYPE
};

struct dirty_seglist_info {
        const struct victim_selection *v_ops;   /* victim selction operation */
        unsigned long *dirty_segmap[NR_DIRTY_TYPE];
        struct mutex seglist_lock;              /* lock for segment bitmaps */
        int nr_dirty[NR_DIRTY_TYPE];            /* # of dirty segments */
        unsigned long *victim_segmap[2];        /* BG_GC, FG_GC */
};

/* victim selection function for cleaning and SSR */
struct victim_selection {
        int (*get_victim)(struct f2fs_sb_info *, unsigned int *,
                                                        int, int, char);
};

/* for active log information */
struct curseg_info {
        struct mutex curseg_mutex;              /* lock for consistency */
        struct f2fs_summary_block *sum_blk;     /* cached summary block */
        unsigned char alloc_type;               /* current allocation type */
        unsigned int segno;                     /* current segment number */
        unsigned short next_blkoff;             /* next block offset to write */
        unsigned int zone;                      /* current zone number */
        unsigned int next_segno;                /* preallocated segment */
};

/*
 * inline functions
 */
static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
{
        return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
}

static inline struct seg_entry *get_seg_entry(struct f2fs_sb_info *sbi,
                                                unsigned int segno)
{
        struct sit_info *sit_i = SIT_I(sbi);
        return &sit_i->sentries[segno];
}

static inline struct sec_entry *get_sec_entry(struct f2fs_sb_info *sbi,
                                                unsigned int segno)
{
        struct sit_info *sit_i = SIT_I(sbi);
        return &sit_i->sec_entries[GET_SECNO(sbi, segno)];
}

static inline unsigned int get_valid_blocks(struct f2fs_sb_info *sbi,
                                unsigned int segno, int section)
{
        /*
         * In order to get # of valid blocks in a section instantly from many
         * segments, f2fs manages two counting structures separately.
         */
        if (section > 1)
                return get_sec_entry(sbi, segno)->valid_blocks;
        else
                return get_seg_entry(sbi, segno)->valid_blocks;
}

static inline void seg_info_from_raw_sit(struct seg_entry *se,
                                        struct f2fs_sit_entry *rs)
{
        se->valid_blocks = GET_SIT_VBLOCKS(rs);
        se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);
        memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
        memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
        se->type = GET_SIT_TYPE(rs);
        se->mtime = le64_to_cpu(rs->mtime);
}

static inline void seg_info_to_raw_sit(struct seg_entry *se,
                                        struct f2fs_sit_entry *rs)
{
        unsigned short raw_vblocks = (se->type << SIT_VBLOCKS_SHIFT) |
                                        se->valid_blocks;
        rs->vblocks = cpu_to_le16(raw_vblocks);
        memcpy(rs->valid_map, se->cur_valid_map, SIT_VBLOCK_MAP_SIZE);
        memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
        se->ckpt_valid_blocks = se->valid_blocks;
        rs->mtime = cpu_to_le64(se->mtime);
}

static inline unsigned int find_next_inuse(struct free_segmap_info *free_i,
                unsigned int max, unsigned int segno)
{
        unsigned int ret;
        read_lock(&free_i->segmap_lock);
        ret = find_next_bit(free_i->free_segmap, max, segno);
        read_unlock(&free_i->segmap_lock);
        return ret;
}

static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int secno = segno / sbi->segs_per_sec;
        unsigned int start_segno = secno * sbi->segs_per_sec;
        unsigned int next;

        write_lock(&free_i->segmap_lock);
        clear_bit(segno, free_i->free_segmap);
        free_i->free_segments++;

        next = find_next_bit(free_i->free_segmap, TOTAL_SEGS(sbi), start_segno);
        if (next >= start_segno + sbi->segs_per_sec) {
                clear_bit(secno, free_i->free_secmap);
                free_i->free_sections++;
        }
        write_unlock(&free_i->segmap_lock);
}

static inline void __set_inuse(struct f2fs_sb_info *sbi,
                unsigned int segno)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int secno = segno / sbi->segs_per_sec;
        set_bit(segno, free_i->free_segmap);
        free_i->free_segments--;
        if (!test_and_set_bit(secno, free_i->free_secmap))
                free_i->free_sections--;
}

static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
                unsigned int segno)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int secno = segno / sbi->segs_per_sec;
        unsigned int start_segno = secno * sbi->segs_per_sec;
        unsigned int next;

        write_lock(&free_i->segmap_lock);
        if (test_and_clear_bit(segno, free_i->free_segmap)) {
                free_i->free_segments++;

                next = find_next_bit(free_i->free_segmap, TOTAL_SEGS(sbi),
                                                                start_segno);
                if (next >= start_segno + sbi->segs_per_sec) {
                        if (test_and_clear_bit(secno, free_i->free_secmap))
                                free_i->free_sections++;
                }
        }
        write_unlock(&free_i->segmap_lock);
}

static inline void __set_test_and_inuse(struct f2fs_sb_info *sbi,
                unsigned int segno)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int secno = segno / sbi->segs_per_sec;
        write_lock(&free_i->segmap_lock);
        if (!test_and_set_bit(segno, free_i->free_segmap)) {
                free_i->free_segments--;
                if (!test_and_set_bit(secno, free_i->free_secmap))
                        free_i->free_sections--;
        }
        write_unlock(&free_i->segmap_lock);
}

static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
                void *dst_addr)
{
        struct sit_info *sit_i = SIT_I(sbi);
        memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
}

static inline block_t written_block_count(struct f2fs_sb_info *sbi)
{
        struct sit_info *sit_i = SIT_I(sbi);
        block_t vblocks;

        mutex_lock(&sit_i->sentry_lock);
        vblocks = sit_i->written_valid_blocks;
        mutex_unlock(&sit_i->sentry_lock);

        return vblocks;
}

static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int free_segs;

        read_lock(&free_i->segmap_lock);
        free_segs = free_i->free_segments;
        read_unlock(&free_i->segmap_lock);

        return free_segs;
}

static inline int reserved_segments(struct f2fs_sb_info *sbi)
{
        return SM_I(sbi)->reserved_segments;
}

static inline unsigned int free_sections(struct f2fs_sb_info *sbi)
{
        struct free_segmap_info *free_i = FREE_I(sbi);
        unsigned int free_secs;

        read_lock(&free_i->segmap_lock);
        free_secs = free_i->free_sections;
        read_unlock(&free_i->segmap_lock);

        return free_secs;
}

static inline unsigned int prefree_segments(struct f2fs_sb_info *sbi)
{
        return DIRTY_I(sbi)->nr_dirty[PRE];
}

static inline unsigned int dirty_segments(struct f2fs_sb_info *sbi)
{
        return DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_DATA] +
                DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_DATA] +
                DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_DATA] +
                DIRTY_I(sbi)->nr_dirty[DIRTY_HOT_NODE] +
                DIRTY_I(sbi)->nr_dirty[DIRTY_WARM_NODE] +
                DIRTY_I(sbi)->nr_dirty[DIRTY_COLD_NODE];
}

static inline int overprovision_segments(struct f2fs_sb_info *sbi)
{
        return SM_I(sbi)->ovp_segments;
}

static inline int overprovision_sections(struct f2fs_sb_info *sbi)
{
        return ((unsigned int) overprovision_segments(sbi)) / sbi->segs_per_sec;
}

static inline int reserved_sections(struct f2fs_sb_info *sbi)
{
        return ((unsigned int) reserved_segments(sbi)) / sbi->segs_per_sec;
}

static inline bool need_SSR(struct f2fs_sb_info *sbi)
{
        return (free_sections(sbi) < overprovision_sections(sbi));
}

static inline int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
{
        struct curseg_info *curseg = CURSEG_I(sbi, type);
        return DIRTY_I(sbi)->v_ops->get_victim(sbi,
                                &(curseg)->next_segno, BG_GC, type, SSR);
}

static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi)
{
        unsigned int pages_per_sec = (1 << sbi->log_blocks_per_seg) *
                        sbi->segs_per_sec;
        int node_secs = ((get_pages(sbi, F2FS_DIRTY_NODES) + pages_per_sec - 1)
                        >> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
        int dent_secs = ((get_pages(sbi, F2FS_DIRTY_DENTS) + pages_per_sec - 1)
                        >> sbi->log_blocks_per_seg) / sbi->segs_per_sec;

        if (sbi->por_doing)
                return false;

        if (free_sections(sbi) <= (node_secs + 2 * dent_secs +
                                                reserved_sections(sbi)))
                return true;
        return false;
}

static inline int utilization(struct f2fs_sb_info *sbi)
{
        return (long int)valid_user_blocks(sbi) * 100 /
                        (long int)sbi->user_block_count;
}

/*
 * Sometimes f2fs may be better to drop out-of-place update policy.
 * So, if fs utilization is over MIN_IPU_UTIL, then f2fs tries to write
 * data in the original place likewise other traditional file systems.
 * But, currently set 100 in percentage, which means it is disabled.
 * See below need_inplace_update().
 */
#define MIN_IPU_UTIL            100
static inline bool need_inplace_update(struct inode *inode)
{
        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
        if (S_ISDIR(inode->i_mode))
                return false;
        if (need_SSR(sbi) && utilization(sbi) > MIN_IPU_UTIL)
                return true;
        return false;
}

static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
                int type)
{
        struct curseg_info *curseg = CURSEG_I(sbi, type);
        return curseg->segno;
}

static inline unsigned char curseg_alloc_type(struct f2fs_sb_info *sbi,
                int type)
{
        struct curseg_info *curseg = CURSEG_I(sbi, type);
        return curseg->alloc_type;
}

static inline unsigned short curseg_blkoff(struct f2fs_sb_info *sbi, int type)
{
        struct curseg_info *curseg = CURSEG_I(sbi, type);
        return curseg->next_blkoff;
}

static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
{
        unsigned int end_segno = SM_I(sbi)->segment_count - 1;
        BUG_ON(segno > end_segno);
}

/*
 * This function is used for only debugging.
 * NOTE: In future, we have to remove this function.
 */
static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
{
        struct f2fs_sm_info *sm_info = SM_I(sbi);
        block_t total_blks = sm_info->segment_count << sbi->log_blocks_per_seg;
        block_t start_addr = sm_info->seg0_blkaddr;
        block_t end_addr = start_addr + total_blks - 1;
        BUG_ON(blk_addr < start_addr);
        BUG_ON(blk_addr > end_addr);
}

/*
 * Summary block is always treated as invalid block
 */
static inline void check_block_count(struct f2fs_sb_info *sbi,
                int segno, struct f2fs_sit_entry *raw_sit)
{
        struct f2fs_sm_info *sm_info = SM_I(sbi);
        unsigned int end_segno = sm_info->segment_count - 1;
        int valid_blocks = 0;
        int i;

        /* check segment usage */
        BUG_ON(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg);

        /* check boundary of a given segment number */
        BUG_ON(segno > end_segno);

        /* check bitmap with valid block count */
        for (i = 0; i < sbi->blocks_per_seg; i++)
                if (f2fs_test_bit(i, raw_sit->valid_map))
                        valid_blocks++;
        BUG_ON(GET_SIT_VBLOCKS(raw_sit) != valid_blocks);
}

static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
                                                unsigned int start)
{
        struct sit_info *sit_i = SIT_I(sbi);
        unsigned int offset = SIT_BLOCK_OFFSET(sit_i, start);
        block_t blk_addr = sit_i->sit_base_addr + offset;

        check_seg_range(sbi, start);

        /* calculate sit block address */
        if (f2fs_test_bit(offset, sit_i->sit_bitmap))
                blk_addr += sit_i->sit_blocks;

        return blk_addr;
}

static inline pgoff_t next_sit_addr(struct f2fs_sb_info *sbi,
                                                pgoff_t block_addr)
{
        struct sit_info *sit_i = SIT_I(sbi);
        block_addr -= sit_i->sit_base_addr;
        if (block_addr < sit_i->sit_blocks)
                block_addr += sit_i->sit_blocks;
        else
                block_addr -= sit_i->sit_blocks;

        return block_addr + sit_i->sit_base_addr;
}

static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
{
        unsigned int block_off = SIT_BLOCK_OFFSET(sit_i, start);

        if (f2fs_test_bit(block_off, sit_i->sit_bitmap))
                f2fs_clear_bit(block_off, sit_i->sit_bitmap);
        else
                f2fs_set_bit(block_off, sit_i->sit_bitmap);
}

static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi)
{
        struct sit_info *sit_i = SIT_I(sbi);
        return sit_i->elapsed_time + CURRENT_TIME_SEC.tv_sec -
                                                sit_i->mounted_time;
}

static inline void set_summary(struct f2fs_summary *sum, nid_t nid,
                        unsigned int ofs_in_node, unsigned char version)
{
        sum->nid = cpu_to_le32(nid);
        sum->ofs_in_node = cpu_to_le16(ofs_in_node);
        sum->version = version;
}

static inline block_t start_sum_block(struct f2fs_sb_info *sbi)
{
        return __start_cp_addr(sbi) +
                le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
}

static inline block_t sum_blk_addr(struct f2fs_sb_info *sbi, int base, int type)
{
        return __start_cp_addr(sbi) +
                le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_total_block_count)
                                - (base + 1) + type;
}