linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: introduce FI_COMPRESS

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Date:   Thu, 10 Jun 2021 23:24:37 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: introduce FI_COMPRESS_RELEASED
 instead of using IMMUTABLE bit

On 2021/6/10 2:43, Jaegeuk Kim wrote:
> On 06/08, Chao Yu wrote:
>> On 2021/6/8 0:56, Jaegeuk Kim wrote:
>>> On 06/06, Chao Yu wrote:
>>>> On 2021/5/26 4:49, Jaegeuk Kim wrote:
>>>>> Once we release compressed blocks, we used to set IMMUTABLE bit. But it turned
>>>>> out it disallows every fs operations which we don't need for compression.
>>>>>
>>>>> Let's just prevent writing data only.
>>>>>
>>>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>>>
>>>> Reviewed-by: Chao Yu <yuchao0@...wei.com>
>>>>
>>>> BTW, we need to expose .i_inline field to userspace since there is no
>>>> way to check status of inode whether it has released blocks?
>>>
>>> Need to add some in F2FS_IOC_GET_COMPRESS_OPTION?
>>
>> We should not change this interface, in order to keep its compatibility for
>> userspace usage. How about adding it in F2FS_IOC_GET_COMPRESS_OPTION_EX?
> 
> Hmm, or need to add it in getflags?

Not sure whether the flag may conflict with the bit FS_*_FL used in
lsattr/chattr.

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>>>
>>>> Thanks,