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: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 614e444..93aae54 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -255,15 +255,13 @@
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,
