On 08/20, Jaegeuk Kim wrote:
> On 08/20, Chao Yu wrote:
> > On 2019/8/20 4:20, Jaegeuk Kim wrote:
> > > On 07/26, Chao Yu wrote:
> > >> build_sit_info() allocate all bitmaps for each segment one by one,
> > >> it's quite low efficiency, this pach changes to allocate large
> > >> continuous memory at a time, and divide it and assign for each bitmaps
> > >> of segment. For large size image, it can expect improving its mount
> > >> speed.
> > >
> > > Hmm, I hit a kernel panic when mounting a partition during fault
> > > injection test:
> > >
> > > 726 #ifdef CONFIG_F2FS_CHECK_FS
> > > 727 if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
> > > 728 f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
> > > 729 f2fs_bug_on(sbi, 1);
> > > 730 #endif
> >
> > We didn't change anything about sit_i->sit_bitmap{_mir,}, it's so wired we
> > panic
> > here... :(
> >
> > I double check the change, but find nothing suspicious, btw, my fault
> > injection
> > testcase shows normal.
> >
> > Jaegeuk, do you have any idea about this issue?
>
> I'm bisecting. :P
It was caused by wrong bitmap size in "f2fs: Fix indefinite loop in f2fs_gc()".
Fixed by:
---
fs/f2fs/segment.c | 18 ++
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9b20ce3b87cc..cc230fc829e1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3950,7 +3950,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
struct sit_info *sit_i;
unsigned int sit_segs, start;
char *src_bitmap, *bitmap;
- unsigned int bitmap_size;
+ unsigned int bitmap_size, main_bitmap_size, sit_bitmap_size;
/* allocate memory for SIT information */
sit_i = f2fs_kzalloc(sbi, sizeof(struct sit_info), GFP_KERNEL);
@@ -3966,8 +3966,8 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
if (!sit_i->sentries)
return -ENOMEM;
- bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
- sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(sbi, bitmap_size,
+ main_bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
+ sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(sbi, main_bitmap_size,
GFP_KERNEL);
if (!sit_i->dirty_sentries_bitmap)
return -ENOMEM;
@@ -4016,19 +4016,21 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
/* setup SIT bitmap from ckeckpoint pack */
- bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
+ sit_bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
- sit_i->sit_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
+ sit_i->sit_bitmap = kmemdup(src_bitmap, sit_bitmap_size, GFP_KERNEL);
if (!sit_i->sit_bitmap)
return -ENOMEM;
#ifdef CONFIG_F2FS_CHECK_FS
- sit_i->sit_bitmap_mir = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
+ sit_i->sit_bitmap_mir = kmemdup(src_bitmap,
+ sit_bitmap_size, GFP_KERNEL);
if (!sit_i->sit_bitmap_mir)
return -ENOMEM;
- sit_i->invalid_segmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
+ sit_i->invalid_segmap = f2fs_kvzalloc(sbi,
+ main_bitmap_size, GFP_KERNEL);
if (!sit_i->invalid_segmap)
return -ENOMEM;
#endif
@@ -4039,7 +4041,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
sit_i->written_valid_blocks = 0;
- sit_i->bitmap_size = bitmap_size;
+ sit_i->bitmap_size = sit_bitmap_size;
sit_i->dirty_sentries = 0;
sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
--
2.19.0.605.g01d371f741-goog
>
> >
> > Thanks,
> >
> > >
> > > For your information, I'm testing without this patch.
> > >
> > > Thanks,
> > >
> > >>
> > >> Signed-off-by: Chen Gong
> > >> Signed-off-by: Chao Yu
> > >> ---
> > >> v2:
> > >> - fix warning triggered in kmalloc() if requested memory size exceeds
> > >> 4MB.
> > >> fs/f2fs/segment.c | 51 +--
> > >> fs/f2fs/segment.h | 1 +
> > >> 2 files changed, 24 insertions(+), 28 deletions(-)
> > >>
> > >> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > >> index a661ac32e829..d720eacd9c57 100644
> > >> --- a/fs/f2fs/segment.c
> > >> +++ b/fs/f2fs/segment.c
> > >> @@ -3941,7 +3941,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
> > >> struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
> > >> struct sit_info *sit_i;
> > >> unsigned int sit_segs, start;
> > >> -char *src_bitmap;