linux-ext4 - Re: [PATCH] ext4: reserve inodes and feature code for 'quota' feature

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Date:	Tue, 15 Feb 2011 07:23:26 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	Tao Ma <tm@....ma>
Cc:	Aditya Kali <adityakali@...gle.com>, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: Re: [PATCH] ext4: reserve inodes and feature code for 'quota' feature

On Tue, Feb 15, 2011 at 4:04 AM, Tao Ma <tm@....ma> wrote:
> Hi Aditya,
> On 02/15/2011 09:06 AM, Aditya Kali wrote:
>>
>> I am working on patch to add quota as a built-in feature for ext4
>> filesystem. The implementation is based on the design given at
>> https://ext4.wiki.kernel.org/index.php/Design_For_1st_Class_Quota_in_Ext4.
>> This patch reserves the inode numbers 3 and 4 for quota purposes and
>> also reserves EXT4_FEATURE_RO_COMPAT_QUOTA feature code.
>>
>> Signed-off-by: Aditya Kali<adityakali@...gle.com>
>> ---
>>  fs/ext4/ext4.h |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>> index 0c8d97b..127f76f 100644
>> --- a/fs/ext4/ext4.h
>> +++ b/fs/ext4/ext4.h
>> @@ -209,6 +209,8 @@ struct ext4_io_submit {
>>   */
>>  #define       EXT4_BAD_INO             1      /* Bad blocks inode */
>>  #define EXT4_ROOT_INO          2      /* Root inode */
>> +#define EXT4_USR_QUOTA_INO      3      /* User quota inode */
>> +#define EXT4_GRP_QUOTA_INO      4      /* Group quota inode */
>>  #define EXT4_BOOT_LOADER_INO   5      /* Boot loader inode */
>>  #define EXT4_UNDEL_DIR_INO     6      /* Undelete directory inode */
>>  #define EXT4_RESIZE_INO                7      /* Reserved group
>> descriptors inode */
>> @@ -1337,6 +1339,7 @@ static inline void ext4_clear_state_flags(struct
>> ext4_inode_info *ei)
>>  #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM               0x0010
>>  #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK      0x0020
>>  #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE    0x0040
>> +#define EXT4_FEATURE_RO_COMPAT_QUOTA           0x0100
>>
>
> I am just wondering why 0x0080 is skipped here? It is reserved already?

Yes, it is reserved for EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT

>>
>>  #define EXT4_FEATURE_INCOMPAT_COMPRESSION     0x0001
>>  #define EXT4_FEATURE_INCOMPAT_FILETYPE                0x0002
>>
>
> Regards,
> Tao
> --
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