unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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f2fs: correct search area in get_new_segment

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get_new_segment starts from current segment position, tries to search a
free segment among its right neighbors locate in same section.

But previously our search area was set as [current segment, max segment],
which means we have to search to more bits in free_segmap bitmap for some
worse cases. So here we correct the search area to [current segment, last
segment in section] to avoid unnecessary searching.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2016-01-22 17:42:06 +08:00 committed by Jaegeuk Kim
parent 2304cb0c44
commit 0ab1435631
1 changed files with 2 additions and 3 deletions
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5
fs/f2fs/segment.c
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@ -874,9 +874,8 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
segno = find_next_zero_bit(free_i->free_segmap,
MAIN_SEGS(sbi), *newseg + 1);
if (segno - *newseg < sbi->segs_per_sec -
(*newseg % sbi->segs_per_sec))
(hint + 1) * sbi->segs_per_sec, *newseg + 1);
if (segno < (hint + 1) * sbi->segs_per_sec)
goto got_it;
}
find_other_zone: