linux-kernel - Re: [PATCH v4 3/6] fat: zero out seek range on _fat_get

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Date:	Wed, 19 Mar 2014 18:40:20 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v4 3/6] fat: zero out seek range on _fat_get_block

2014-03-18 23:59 GMT+09:00, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> +static void check_fallocated_region(struct inode *inode, sector_t
>> iblock,
>> +		unsigned long *max_blocks, struct buffer_head *bh_result)
>> +{
>> +	struct super_block *sb = inode->i_sb;
>> +	sector_t last_block, disk_block;
>> +	const unsigned long blocksize = sb->s_blocksize;
>> +	const unsigned char blocksize_bits = sb->s_blocksize_bits;
>> +
>> +	last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
>> +		>> blocksize_bits;
>> +	disk_block = (MSDOS_I(inode)->i_disksize + (blocksize - 1))
>> +		>> blocksize_bits;
>> +	if (iblock >= last_block && iblock <= disk_block) {
>
Hi OGAWA.
> Maybe off-by-one error. If iblock == disk_block, phys should not be set
> by fat_bmap()?
Yes, right, iblock == disk_block case is not needed in this condition
because fat_bmap don't set to phys when iblock==diskblock.(phys will
be 0)
So I will change it like this.

if (iblock >= last_block && iblock < disk_block) {

And I will fix your review comments in other patches.

Thanks for review!
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
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