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

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Message-ID: <87a9cn4kot.fsf@devron.myhome.or.jp>
Date:	Tue, 18 Mar 2014 23:59:14 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
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

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) {

Maybe off-by-one error. If iblock == disk_block, phys should not be set
by fat_bmap()?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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