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f2fs: get the right gc victim section when section has several segments

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Assume each section has 4 segment:
     .___________________________.
     |_Segment0_|_..._|_Segment3_|
     .                          .
     .                  .
     .__________.
     |_section0_|

Segment 0~2 has 0 valid block, segment 3 has 512 valid blocks.
It will fail if we want to gc section0 in this scenes,
because all 4 segments in section0 is not dirty.
So we should use dirty section bitmap instead of dirty segment bitmap
to get right victim section.

Signed-off-by: Jack Qiu <jack.qiu@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jack Qiu
2020-06-18 12:37:10 +08:00
committato da Jaegeuk Kim
parent db5ae36329
commit da52f8ade4
3 ha cambiato i file con 88 aggiunte e 20 eliminazioni
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39
fs/f2fs/gc.c
Vedi File

@@ -21,6 +21,9 @@
#include "gc.h"
#include <trace/events/f2fs.h>
static unsigned int count_bits(const unsigned long *addr,
unsigned int offset, unsigned int len);
static int gc_thread_func(void *data)
{
struct f2fs_sb_info *sbi = data;
@@ -187,14 +190,20 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
if (p->alloc_mode == SSR) {
p->gc_mode = GC_GREEDY;
p->dirty_segmap = dirty_i->dirty_segmap[type];
p->dirty_bitmap = dirty_i->dirty_segmap[type];
p->max_search = dirty_i->nr_dirty[type];
p->ofs_unit = 1;
} else {
p->gc_mode = select_gc_type(sbi, gc_type);
p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
p->max_search = dirty_i->nr_dirty[DIRTY];
p->ofs_unit = sbi->segs_per_sec;
if (__is_large_section(sbi)) {
p->dirty_bitmap = dirty_i->dirty_secmap;
p->max_search = count_bits(p->dirty_bitmap,
0, MAIN_SECS(sbi));
} else {
p->dirty_bitmap = dirty_i->dirty_segmap[DIRTY];
p->max_search = dirty_i->nr_dirty[DIRTY];
}
}
/*
@@ -365,10 +374,14 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
}
while (1) {
unsigned long cost;
unsigned int segno;
unsigned long cost, *dirty_bitmap;
unsigned int unit_no, segno;
segno = find_next_bit(p.dirty_segmap, last_segment, p.offset);
dirty_bitmap = p.dirty_bitmap;
unit_no = find_next_bit(dirty_bitmap,
last_segment / p.ofs_unit,
p.offset / p.ofs_unit);
segno = unit_no * p.ofs_unit;
if (segno >= last_segment) {
if (sm->last_victim[p.gc_mode]) {
last_segment =
@@ -381,14 +394,7 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
}
p.offset = segno + p.ofs_unit;
if (p.ofs_unit > 1) {
p.offset -= segno % p.ofs_unit;
nsearched += count_bits(p.dirty_segmap,
p.offset - p.ofs_unit,
p.ofs_unit);
} else {
nsearched++;
}
nsearched++;
#ifdef CONFIG_F2FS_CHECK_FS
/*
@@ -421,9 +427,10 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
next:
if (nsearched >= p.max_search) {
if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
sm->last_victim[p.gc_mode] = last_victim + 1;
sm->last_victim[p.gc_mode] =
last_victim + p.ofs_unit;
else
sm->last_victim[p.gc_mode] = segno + 1;
sm->last_victim[p.gc_mode] = segno + p.ofs_unit;
sm->last_victim[p.gc_mode] %=
(MAIN_SECS(sbi) * sbi->segs_per_sec);
break;