linux-kernel - Re: [PATCH 1/5] fat: remove parent_logstart check in fat_get

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Date:	Wed, 31 Oct 2012 09:51:38 +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>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 1/5] fat: remove parent_logstart check in fat_get_parent

2012/10/31, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>
>> The root directory inode is added to the directory hash table in
>> fat_attach when mounted with nfs option. Since root dentry never
>> expires until umount, fat_dget never fails to return the root inode
>> for subdirectories of root inode.i.e., parent_logstart cannot be zero.
>
> Sorry, I will review at this weekend.
No problem, Thank you.
>
> Thanks.
>
>> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
>> Signed-off-by: Ravishankar N <ravi.n1@...sung.com>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
>> ---
>>  fs/fat/nfs.c |   51 ++++++++++++++++++++++-----------------------------
>>  1 file changed, 22 insertions(+), 29 deletions(-)
>>
>> diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
>> index a4e6ac7..671a75d 100644
>> --- a/fs/fat/nfs.c
>> +++ b/fs/fat/nfs.c
>> @@ -274,36 +274,29 @@ struct dentry *fat_get_parent(struct dentry
>> *child_dir)
>>  		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;
>> -		else {
>> -			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);
>> +		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);
>>  	}
>>  out:
>>  	brelse(dotdot_bh);
>
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
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