Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 9 Jun 2021 11:43:31 -0700
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <chao@kernel.org>
Cc:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: introduce FI_COMPRESS_RELEASED
 instead of using IMMUTABLE bit
Message-ID: <YMEL06gZC5n3J2bX@google.com>
References: <20210525204955.2512409-1-jaegeuk@kernel.org>
 <20210525204955.2512409-2-jaegeuk@kernel.org>
 <95b5669f-a521-5865-2089-320e2a2493de@kernel.org>
 <YL5P15nLsc/3GQOY@google.com>
 <3f2c2543-c8a4-3477-76af-5c7614b643e8@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <3f2c2543-c8a4-3477-76af-5c7614b643e8@kernel.org>
Precedence: bulk

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@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?

Hmm, or need to add it in getflags?

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