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f2fs: clarify and enhance the f2fs_gc flow

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This patch makes clearer the ambiguous f2fs_gc flow as follows.

1. Remove intermediate checkpoint condition during f2fs_gc
 (i.e., should_do_checkpoint() and GC_BLOCKED)

2. Remove unnecessary return values of f2fs_gc because of #1.
 (i.e., GC_NODE, GC_OK, etc)

3. Simplify write_checkpoint() because of #2.

4. Clarify the main f2fs_gc flow.
 o monitor how many freed sections during one iteration of do_garbage_collect().
 o do GC more without checkpoints if we can't get enough free sections.
 o do checkpoint once we've got enough free sections through forground GCs.

5. Adopt thread-logging (Slack-Space-Recycle) scheme more aggressively on data
  log types. See. get_ssr_segement()

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim
2013-02-04 15:11:17 +09:00
parent b1f1daf8c7
commit 437275272f
9 changed files with 72 additions and 105 deletions
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12
fs/f2fs/segment.h
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@@ -450,21 +450,15 @@ 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)
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) <= (node_secs + 2 * dent_secs +
return ((free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +
reserved_sections(sbi)));
}