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Commit 355e7891 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: check in-memory block bitmap 



This patch adds a mirror for valid block bitmap, and use it to detect
in-memory bitmap corruption which may be caused by bit-transition of
cache or memory overflow.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 5fe45743

fs/f2fs/segment.c

+30 −2
Original line number Diff line number Diff line
@@ -1021,14 +1021,32 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del) 


	/* Update valid block bitmap */

	if (del > 0) {

		if (f2fs_test_and_set_bit(offset, se->cur_valid_map))

		if (f2fs_test_and_set_bit(offset, se->cur_valid_map)) {

#ifdef CONFIG_F2FS_CHECK_FS

			if (f2fs_test_and_set_bit(offset,

						se->cur_valid_map_mir))

				f2fs_bug_on(sbi, 1);

			else

				WARN_ON(1);

#else

			f2fs_bug_on(sbi, 1);

#endif

		}

		if (f2fs_discard_en(sbi) &&

			!f2fs_test_and_set_bit(offset, se->discard_map))

			sbi->discard_blks--;

	} else {

		if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map))

		if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map)) {

#ifdef CONFIG_F2FS_CHECK_FS

			if (!f2fs_test_and_clear_bit(offset,

						se->cur_valid_map_mir))

				f2fs_bug_on(sbi, 1);

			else

				WARN_ON(1);

#else

			f2fs_bug_on(sbi, 1);

#endif

		}

		if (f2fs_discard_en(sbi) &&

			f2fs_test_and_clear_bit(offset, se->discard_map))

			sbi->discard_blks++;
@@ -2357,6 +2375,13 @@ static int build_sit_info(struct f2fs_sb_info *sbi) 
				!sit_i->sentries[start].ckpt_valid_map)

			return -ENOMEM;



#ifdef CONFIG_F2FS_CHECK_FS

		sit_i->sentries[start].cur_valid_map_mir

			= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);

		if (!sit_i->sentries[start].cur_valid_map_mir)

			return -ENOMEM;

#endif



		if (f2fs_discard_en(sbi)) {

			sit_i->sentries[start].discard_map

				= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
@@ -2786,6 +2811,9 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi) 
	if (sit_i->sentries) {

		for (start = 0; start < MAIN_SEGS(sbi); start++) {

			kfree(sit_i->sentries[start].cur_valid_map);

#ifdef CONFIG_F2FS_CHECK_FS

			kfree(sit_i->sentries[start].cur_valid_map_mir);

#endif

			kfree(sit_i->sentries[start].ckpt_valid_map);

			kfree(sit_i->sentries[start].discard_map);

		}

fs/f2fs/segment.h

+6 −0
Original line number Diff line number Diff line
@@ -164,6 +164,9 @@ struct seg_entry { 
	unsigned int ckpt_valid_blocks:10;	/* # of valid blocks last cp */

	unsigned int padding:6;		/* padding */

	unsigned char *cur_valid_map;	/* validity bitmap of blocks */

#ifdef CONFIG_F2FS_CHECK_FS

	unsigned char *cur_valid_map_mir;	/* mirror of current valid bitmap */

#endif

	/*

	 * # of valid blocks and the validity bitmap stored in the the last

	 * checkpoint pack. This information is used by the SSR mode.
@@ -320,6 +323,9 @@ static inline void seg_info_from_raw_sit(struct seg_entry *se, 
	se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);

	memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);

	memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);

#ifdef CONFIG_F2FS_CHECK_FS

	memcpy(se->cur_valid_map_mir, rs->valid_map, SIT_VBLOCK_MAP_SIZE);

#endif

	se->type = GET_SIT_TYPE(rs);

	se->mtime = le64_to_cpu(rs->mtime);

}