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f2fs: fix to search whole dirty segmap when get_victim

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In ->get_victim we get max_search value from dirty_i->nr_dirty without
protection of seglist_lock, after that, nr_dirty can be increased/decreased
before we hold seglist_lock lock.
Then in main loop we attempt to traverse all dirty section one time to find
victim section, but it's not accurate to use max_search as the total loop count,
because we might lose checking several sections or check sections redundantly
for the case of nr_dirty are increased or decreased previously.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2014-09-15 18:05:44 +08:00 committed by Jaegeuk Kim
parent 26666c8a43
commit 210f41bc04
1 changed files with 2 additions and 2 deletions
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4
fs/f2fs/gc.c
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@ -263,14 +263,14 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
unsigned int secno, max_cost; unsigned int secno, max_cost;
int nsearched = 0; int nsearched = 0;
mutex_lock(&dirty_i->seglist_lock);
p.alloc_mode = alloc_mode; p.alloc_mode = alloc_mode;
select_policy(sbi, gc_type, type, &p); select_policy(sbi, gc_type, type, &p);
p.min_segno = NULL_SEGNO; p.min_segno = NULL_SEGNO;
p.min_cost = max_cost = get_max_cost(sbi, &p); p.min_cost = max_cost = get_max_cost(sbi, &p);
mutex_lock(&dirty_i->seglist_lock);
if (p.alloc_mode == LFS && gc_type == FG_GC) { if (p.alloc_mode == LFS && gc_type == FG_GC) {
p.min_segno = check_bg_victims(sbi); p.min_segno = check_bg_victims(sbi);
if (p.min_segno != NULL_SEGNO) if (p.min_segno != NULL_SEGNO)