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

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Message-ID: <3f2c2543-c8a4-3477-76af-5c7614b643e8@kernel.org>
Date:   Tue, 8 Jun 2021 07:17:27 +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 2021/6/8 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?

Thanks,

> 
>>
>> Thanks,