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linux-next/fs/f2fs/segment.h
Jaegeuk Kim 5ec4e49f9b f2fs: change GC bitmaps to apply the section granularity 
This patch removes a bitmap for victim segments selected by foreground GC, and
modifies the other bitmap for victim segments selected by background GC.

1) foreground GC bitmap
 : We don't need to manage this, since we just only one previous victim section
   number instead of the whole victim history.
   The f2fs uses the victim section number in order not to allocate currently
   GC'ed section to current active logs.

2) background GC bitmap
 : This bitmap is used to avoid selecting victims repeatedly by background GCs.
   In addition, the victims are able to be selected by foreground GCs, since
   there is no need to read victim blocks during foreground GCs.

   By the fact that the foreground GC reclaims segments in a section unit, it'd
   be better to manage this bitmap based on the section granularity.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-04-03 17:27:49 +09:00

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/*
* 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))
#define NULL_SECNO ((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, seg) \
((seg == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno) || \
(seg == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno) || \
(seg == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) || \
(seg == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) || \
(seg == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) || \
(seg == 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 TOTAL_SECS(sbi) (sbi->total_sections)
#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_secmap; /* background GC victims */
};
/* 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 bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
{
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
if (sbi->por_doing)
return false;
return ((free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +
reserved_sections(sbi)));
}
static inline int utilization(struct f2fs_sb_info *sbi)
{
return div_u64(valid_user_blocks(sbi) * 100, 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;
}
static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
{
if (IS_CURSEC(sbi, secno) || (sbi->cur_victim_sec == secno))
return true;
return false;
}
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