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Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: introduce FI_COMPRESS_RELEASED
 instead of using IMMUTABLE bit
To:     Jaegeuk Kim <jaegeuk@kernel.org>
Cc:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
References: <20210525204955.2512409-1-jaegeuk@kernel.org>
 <20210525204955.2512409-2-jaegeuk@kernel.org>
 <95b5669f-a521-5865-2089-320e2a2493de@kernel.org>
 <YL5P15nLsc/3GQOY@google.com>
From:   Chao Yu <chao@kernel.org>
Message-ID: <3f2c2543-c8a4-3477-76af-5c7614b643e8@kernel.org>
Date:   Tue, 8 Jun 2021 07:17:27 +0800
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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@kernel.org>
>>
>> Reviewed-by: Chao Yu <yuchao0@huawei.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?

Thanks,

> 
>>
>> Thanks,