linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS

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Message-ID: <CACOAw_xZCC3u08=ZB_Ugk-LJs1wJL3ByJhuxwNK9zOYqU46Jzg@mail.gmail.com>
Date:   Tue, 24 Nov 2020 10:03:33 +0900
From:   Daeho Jeong <daeho43@...il.com>
To:     Eric Biggers <ebiggers@...nel.org>
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 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE

2020년 11월 24일 (화) 오전 8:29, Eric Biggers <ebiggers@...nel.org>님이 작성:
>
> On Tue, Nov 24, 2020 at 08:02:21AM +0900, Daeho Jeong wrote:
> > Jaegeuk,
> >
> > My mistake~
> >
> > Eric,
> >
> > What I want is like do_page_cache_ra(), but I used
> > page_cache_ra_unbounded() directly, because we already checked that
> > read is within i_size.
> >
> > Or we could use do_page_cache_ra(), but it might do the same check in it again.
> > What do you think?
>
> page_cache_ra_unbounded() is basically a quirk for how fs-verity is implemented
> in ext4 and f2fs.  I don't think people would be happy if it's used in other
> cases, where it's not needed.  Checking against i_size multiple times is fine.
>

Got your point. Thanks.

> >
> > I could add some description about these in
> > Documentation/filesystems/f2fs.rst and I implemented tests internally.
>
> Documentation in f2fs.rst sounds good.  All the f2fs ioctls should be
> documented there.
>
> The tests should be runnable by any kernel developer; "internal" tests aren't
> very useful.  Could you add tests to xfstests?
>

Yes, I'll add all the internal test cases to xfstests soon~

> - Eric