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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
committed by Jaegeuk Kim
parent db5ae36329
commit da52f8ade4
3 changed files with 88 additions and 20 deletions
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8
fs/f2fs/segment.h
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@@ -166,8 +166,11 @@ enum {
struct victim_sel_policy {
int alloc_mode; /* LFS or SSR */
int gc_mode; /* GC_CB or GC_GREEDY */
unsigned long *dirty_segmap; /* dirty segment bitmap */
unsigned int max_search; /* maximum # of segments to search */
unsigned long *dirty_bitmap; /* dirty segment/section bitmap */
unsigned int max_search; /*
* maximum # of segments/sections
* to search
*/
unsigned int offset; /* last scanned bitmap offset */
unsigned int ofs_unit; /* bitmap search unit */
unsigned int min_cost; /* minimum cost */
@@ -266,6 +269,7 @@ enum dirty_type {
struct dirty_seglist_info {
const struct victim_selection *v_ops; /* victim selction operation */
unsigned long *dirty_segmap[NR_DIRTY_TYPE];
unsigned long *dirty_secmap;
struct mutex seglist_lock; /* lock for segment bitmaps */
int nr_dirty[NR_DIRTY_TYPE]; /* # of dirty segments */
unsigned long *victim_secmap; /* background GC victims */