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

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Date:	Sat, 13 Oct 2012 23:03:31 +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?
Yes.
>
>> +                     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);
>> +             }
>
> Please make this part as own function at least. And this is doing same
> thing with readdir, so we will have to clean this up as I said before.
Okay, I will.

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