linux-ext4 - Re: [PATCH] ext2: initialize quota info in ext2_xattr

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Date:   Sat, 11 Jul 2020 15:27:59 +0800
From:   Chengguang Xu <cgxu519@...ernel.net>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>, jack@...e.com
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext2: initialize quota info in ext2_xattr_set()

在 7/8/2020 6:52 PM, Ritesh Harjani 写道:
>
>
> On 6/26/20 11:19 AM, Chengguang Xu wrote:
>> In order to correctly account/limit space usage, should initialize
>> quota info before calling quota related functions.
>
> How did you encounter the problem?
> Any test case got hit?

I found the issue by code inspecting when I was learning mbcache logic.

Thanks,
cgxu

>
>>
>> Signed-off-by: Chengguang Xu <cgxu519@...ernel.net>
>
> LGTM, feel free to add
> Reviewed-by: Reviewed-by: Ritesh Harjani <riteshh@...ux.ibm.com>
>
>
>> ---
>>   fs/ext2/xattr.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
>> index 943cc469f42f..913e5c4921ec 100644
>> --- a/fs/ext2/xattr.c
>> +++ b/fs/ext2/xattr.c
>> @@ -437,6 +437,9 @@ ext2_xattr_set(struct inode *inode, int 
>> name_index, const char *name,
>>       name_len = strlen(name);
>>       if (name_len > 255 || value_len > sb->s_blocksize)
>>           return -ERANGE;
>> +    error = dquot_initialize(inode);
>> +    if (error)
>> +        return error;
>>       down_write(&EXT2_I(inode)->xattr_sem);
>>       if (EXT2_I(inode)->i_file_acl) {
>>           /* The inode already has an extended attribute block. */
>>