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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-03-31 08:26:03 +0400
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-03 12:27:49 +0400
commit5ec4e49f9bd753e2a6857a96e01f8ae5ff00b459 (patch)
tree25938d3e5e3e5c9bbb37de1ee6c2cd6ad23071a8 /fs/f2fs/segment.h
parent33afa7fde0defbb362328233e600e052d0a22cd5 (diff)
downloadlinux-5ec4e49f9bd753e2a6857a96e01f8ae5ff00b459.tar.xz
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>
Diffstat (limited to 'fs/f2fs/segment.h')
-rw-r--r--fs/f2fs/segment.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index fea9245d4774..994bb7bd7b70 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -10,6 +10,7 @@
*/
/* 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)
@@ -214,7 +215,7 @@ struct dirty_seglist_info {
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 */
+ unsigned long *victim_secmap; /* background GC victims */
};
/* victim selection function for cleaning and SSR */
@@ -616,3 +617,10 @@ static inline block_t sum_blk_addr(struct f2fs_sb_info *sbi, int base, int type)
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;
+}