linux-kernel - Re: [PATCH v4 3/4] fat (exportfs): rebuild directory-inode if fat

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Date:	Tue, 23 Oct 2012 16:34:39 +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 v4 3/4] fat (exportfs): rebuild directory-inode if
 fat_dget() fails

2012/10/13, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> +	if (!fat_get_dotdot_entry(child_dir->d_inode, &dotdot_bh, &de)) {
>> +		parent_logstart = fat_get_start(sbi, de);
>>  		parent_inode = fat_dget(sb, parent_logstart);
>> +		if (parent_inode || sbi->options.nfs != FAT_NFS_NOSTALE_RO)
>> +			goto out;
>> +		if (!parent_logstart)
>> +			/*logstart of dotdot entry is zero if
>> +			* if the directory's parent is root
>> +			*/
>> +			parent_inode = sb->s_root->d_inode;
>
> get_parent() should not be called for root dir, right?
>
>> +			blknr = fat_clus_to_blknr(sbi, parent_logstart);
>> +			parent_bh = sb_bread(sb, blknr);
>> +			if (!parent_bh) {
>> +				fat_msg(sb, KERN_ERR,
>> +					"NFS:unable to read cluster of parent directory");
>> +				goto out;
>> +			}
>> +			de = (struct msdos_dir_entry *) parent_bh->b_data;
>> +			clus_to_match = fat_get_start(sbi, &de[0]);
>> +			search_clus = fat_get_start(sbi, &de[1]);
>> +			if (!search_clus)
>> +				search_clus = sbi->root_cluster;
>> +			brelse(parent_bh);
>> +			do {
>> +				parent_inode =  fat_traverse_cluster(sb,
>> +						search_clus, clus_to_match);
>> +				if (IS_ERR(parent_inode) || parent_inode)
>> +					break;
>> +				search_clus = fat_read_next_clus(sb,
>> +								search_clus);
>> +				if (search_clus < 0)
>> +					break;
>> +			} while (search_clus != FAT_ENT_EOF);
>> +		}
>
Hi. OGAWA.
I have a question.
> Please make this part as own function at least.
Okay, I will make own function.
>And this is doing same
> thing with readdir, so we will have to clean this up as I said before.
When I checked, I didn't understand about same thing readdir and this
function yet. Because even though minor conditions match but
functionality wise both are different.

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