linux-kernel - Re: [PATCH v3 3/5] fat (exportfs): rebuild inode if ilookup() fails

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Message-ID: <CAKYAXd8Zpe8sAfMs-GVBaiafJSU7jO4Yj=qRmFo2w+ho9GD5sQ@mail.gmail.com>
Date:	Mon, 24 Sep 2012 13:13:17 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, bfields@...ldses.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v3 3/5] fat (exportfs): rebuild inode if ilookup() fails

2012/9/22, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> +	if (inode == NULL && MSDOS_SB(sb)->options.nfs == FAT_NFS_LIMITED) {
>> +		struct buffer_head *bh = NULL;
>> +		struct msdos_dir_entry *de ;
>> +		loff_t i_pos = (loff_t)ino;
>> +		int bits = MSDOS_SB(sb)->dir_per_block_bits;
>> +		loff_t blocknr = i_pos >> bits;
>> +		bh = sb_bread(sb, blocknr);
>> +		if (!bh) {
>> +			fat_msg(sb, KERN_ERR,
>> +				 "unable to read block(%llu) for building NFS inode",
>> +				(llu)blocknr);
>> +			return inode;
>> +		}
>> +		de = (struct msdos_dir_entry *)bh->b_data;
>> +		/* If a file is deleted on server and client is not updated
>> +		 * yet, we must not build the inode upon a lookup call.
>> +		 */
>> +		if (de[i_pos&((1<<bits)-1)].name[0] == DELETED_FLAG)
>
> IS_FREE() would be better.
Okay~ I will change.
>
>> +
>> +			inode = NULL;
>> +		else
>> +			inode = fat_build_inode(sb, &de[i_pos&((1<<bits)-1)],
>> +					i_pos);
>> +		brelse(bh);
>> +	}
>>
>>  	return inode;
>>  }
>
> 1 << bits == sbi->dir_per_block
>
> It would be better to add helper to decode i_pos to blocknr and offset.
> And it should be shared on fat_write_inode and this.
Okay, I will change.

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