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| author | Chao Yu <chao2.yu@samsung.com> | 2014-09-15 18:05:44 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-09-23 11:10:23 -0700 |
| commit | 210f41bc048263d572515e1e0edc28d362ce673e (patch) | |
| tree | 63f13e141529262c19db28156fc46933f9a24ccf /fs/f2fs | |
| parent | 26666c8a4366debae30ae37d0688b2bec92d196a (diff) | |
| download | op-kernel-dev-210f41bc048263d572515e1e0edc28d362ce673e.zip op-kernel-dev-210f41bc048263d572515e1e0edc28d362ce673e.tar.gz | |
f2fs: fix to search whole dirty segmap when get_victim
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>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/gc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index dca7818..7bf8392 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -263,14 +263,14 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi, unsigned int secno, max_cost; int nsearched = 0; + mutex_lock(&dirty_i->seglist_lock); + p.alloc_mode = alloc_mode; select_policy(sbi, gc_type, type, &p); p.min_segno = NULL_SEGNO; 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) { p.min_segno = check_bg_victims(sbi); if (p.min_segno != NULL_SEGNO) |
