From da52f8ade40b032eb8111a0fd514c8ac5f8f0f1b Mon Sep 17 00:00:00 2001 From: Jack Qiu Date: Thu, 18 Jun 2020 12:37:10 +0800 Subject: f2fs: get the right gc victim section when section has several segments 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 Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/gc.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) (limited to 'fs/f2fs/gc.c') diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 5b95d5a146eb..9b6fc61ce649 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -21,6 +21,9 @@ #include "gc.h" #include +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; - - segno = find_next_bit(p.dirty_segmap, last_segment, p.offset); + unsigned long cost, *dirty_bitmap; + unsigned int unit_no, segno; + + 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; -- cgit v1.2.3