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Commit 6915ea9d authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: introduce __check_sit_bitmap 



After we introduce discard thread, discard command can be issued
concurrently with data allocating, this patch adds new function to
heck sit bitmap to ensure that userdata was invalid in which on-going
discard command covered.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent cce13252

fs/f2fs/segment.c

+25 −0
Original line number Diff line number Diff line
@@ -763,6 +763,30 @@ static void f2fs_submit_discard_endio(struct bio *bio) 
	bio_put(bio);

}



void __check_sit_bitmap(struct f2fs_sb_info *sbi,

				block_t start, block_t end)

{

#ifdef CONFIG_F2FS_CHECK_FS

	struct seg_entry *sentry;

	unsigned int segno;

	block_t blk = start;

	unsigned long offset, size, max_blocks = sbi->blocks_per_seg;

	unsigned long *map;



	while (blk < end) {

		segno = GET_SEGNO(sbi, blk);

		sentry = get_seg_entry(sbi, segno);

		offset = GET_BLKOFF_FROM_SEG0(sbi, blk);



		size = min((unsigned long)(end - blk), max_blocks);

		map = (unsigned long *)(sentry->cur_valid_map);

		offset = __find_rev_next_bit(map, size, offset);

		f2fs_bug_on(sbi, offset != size);

		blk += size;

	}

#endif

}



/* this function is copied from blkdev_issue_discard from block/blk-lib.c */

static void __submit_discard_cmd(struct f2fs_sb_info *sbi,

				struct discard_cmd *dc)
@@ -790,6 +814,7 @@ static void __submit_discard_cmd(struct f2fs_sb_info *sbi, 
			bio->bi_opf |= REQ_SYNC;

			submit_bio(bio);

			list_move_tail(&dc->list, &dcc->wait_list);

			__check_sit_bitmap(sbi, dc->start, dc->start + dc->len);

		}

	} else {

		__remove_discard_cmd(sbi, dc);