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f2fs: avoid victim selection from previous victim section

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[ Upstream commit e219aecfd4 ]

When f2fs chooses GC victim in large section & LFS mode,
next_victim_seg[gc_type] is referenced first. After segment is freed,
next_victim_seg[gc_type] has the next segment number.
However, next_victim_seg[gc_type] still has the last segment number
even after the last segment of section is freed. In this case, when f2fs
chooses a victim for the next GC round, the last segment of previous victim
section is chosen as a victim.

Initialize next_victim_seg[gc_type] to NULL_SEGNO for the last segment in
large section.

Fixes: e3080b0120 ("f2fs: support subsectional garbage collection")
Signed-off-by: Yonggil Song <yonggil.song@samsung.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yonggil Song 2022-11-22 18:03:20 +09:00 committed by Greg Kroah-Hartman
parent 0807071c1b
commit 3ee8611a1d
1 changed files with 3 additions and 2 deletions
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5
fs/f2fs/gc.c
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@ -1743,8 +1743,9 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
get_valid_blocks(sbi, segno, false) == 0)
seg_freed++;
if (__is_large_section(sbi) && segno + 1 < end_segno)
sbi->next_victim_seg[gc_type] = segno + 1;
if (__is_large_section(sbi))
sbi->next_victim_seg[gc_type] =
(segno + 1 < end_segno) ? segno + 1 : NULL_SEGNO;
skip:
f2fs_put_page(sum_page, 0);
}