Commit 1b3e27a9 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: limit b_size of mapped bh in f2fs_map_bh 



Map bh over max size which caller defined is not needed, limit it in
f2fs_map_bh.

Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 30c62fdb

fs/f2fs/data.c

+4 −6
Original line number Diff line number Diff line
@@ -255,15 +255,13 @@ static void f2fs_map_bh(struct super_block *sb, pgoff_t pgofs, 
			struct extent_info *ei, struct buffer_head *bh_result)

{

	unsigned int blkbits = sb->s_blocksize_bits;

	size_t count;

	size_t max_size = bh_result->b_size;

	size_t mapped_size;



	clear_buffer_new(bh_result);

	map_bh(bh_result, sb, ei->blk + pgofs - ei->fofs);

	count = ei->fofs + ei->len - pgofs;

	if (count < (UINT_MAX >> blkbits))

		bh_result->b_size = (count << blkbits);

	else

		bh_result->b_size = UINT_MAX;

	mapped_size = (ei->fofs + ei->len - pgofs) << blkbits;

	bh_result->b_size = min(max_size, mapped_size);

}



static bool lookup_extent_info(struct inode *inode, pgoff_t pgofs,