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f2fs: limit b_size of mapped bh in f2fs_map_bh

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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>
This commit is contained in:
Chao Yu 2015-03-24 13:08:05 +08:00 committed by Jaegeuk Kim
parent 30c62fdb25
commit 1b3e27a92a
1 changed files with 4 additions and 6 deletions
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10
fs/f2fs/data.c
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@ -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,