linux-kernel - Re: [f2fs-dev] [PATCH v3] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS

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Date:   Mon, 7 Dec 2020 19:49:15 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Daeho Jeong <daeho43@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v3] f2fs: add F2FS_IOC_DECOMPRESS_FILE and
 F2FS_IOC_COMPRESS_FILE

On Thu, Dec 03, 2020 at 03:56:15PM +0900, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
> 
> Added two ioctl to decompress/compress explicitly the compression
> enabled file in "compress_mode=user" mount option.
> 
> Using these two ioctls, the users can make a control of compression
> and decompression of their files.
> 
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---

I still don't understand the purpose of these new ioctls.  What's wrong with
just FS_IOC_SETFLAGS(FS_COMPRESS_FL) to compress a file, or FS_IOC_SETFLAGS(0)
to decompress a file?  That appears to already be supported...

- Eric