Hi, 2013-10-22 (화), 17:28 +0800, Chao Yu: > Previously, check_block_count check valid_map with bit data type in common > scenario that sit has all ones or zeros bitmap, it makes low mount > performance. > So let's check the special bitmap with integer data type instead of the bit > one. > > Signed-off-by: Tan Shu <shu....@samsung.com> > Signed-off-by: Yu Chao <chao2...@samsung.com> > --- > fs/f2fs/segment.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h > index 7f94d78..d43ab9f 100644 > --- a/fs/f2fs/segment.h > +++ b/fs/f2fs/segment.h > @@ -543,6 +543,7 @@ static inline void check_block_count(struct f2fs_sb_info > *sbi, > { > struct f2fs_sm_info *sm_info = SM_I(sbi); > unsigned int end_segno = sm_info->segment_count - 1; > + int *valid_map = (int *)raw_sit->valid_map; > int valid_blocks = 0; > int i; > > @@ -552,6 +553,19 @@ static inline void check_block_count(struct > f2fs_sb_info *sbi, > /* check boundary of a given segment number */ > BUG_ON(segno > end_segno); > > + /* check all ones or zeros valid_map */ > + if (GET_SIT_VBLOCKS(raw_sit) == 0) { > + for (i = 0; i < SIT_VBLOCK_MAP_SIZE / sizeof(int); i++)
We cannot guarantee all the time that SIT_VBLOCK_MAP_SIZE is multiple of sizeof(int). How about using memcmp() with __u8? > + if (unlikely(valid_map[i] != 0)) > + BUG(); > + return; > + } else if (GET_SIT_VBLOCKS(raw_sit) == sbi->blocks_per_seg) { > + for (i = 0; i < SIT_VBLOCK_MAP_SIZE / sizeof(int); i++) > + if (unlikely(valid_map[i] != -1)) > + BUG(); > + return; > + } > + > /* check bitmap with valid block count */ > for (i = 0; i < sbi->blocks_per_seg; i++) > if (f2fs_test_bit(i, raw_sit->valid_map)) > --- > > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Jaegeuk Kim Samsung ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel