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Date:   Thu, 9 Jul 2020 18:15:13 -0700
From:   Eric Biggers <ebiggers@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     Satya Tangirala <satyat@google.com>, linux-fscrypt@vger.kernel.org,
        linux-fsdevel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 5/5] f2fs: support direct I/O with fscrypt using
 blk-crypto
Message-ID: <20200710011513.GA4037751@gmail.com>
References: <20200709194751.2579207-1-satyat@google.com>
 <20200709194751.2579207-6-satyat@google.com>
 <560266ca-0164-c02e-18ea-55564683d13e@huawei.com>
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On Fri, Jul 10, 2020 at 09:05:23AM +0800, Chao Yu wrote:
> On 2020/7/10 3:47, Satya Tangirala wrote:
> > From: Eric Biggers <ebiggers@google.com>
> > 
> > Wire up f2fs with fscrypt direct I/O support.
> > 
> > Signed-off-by: Eric Biggers <ebiggers@google.com>
> > Signed-off-by: Satya Tangirala <satyat@google.com>
> > ---
> >  fs/f2fs/f2fs.h | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index b35a50f4953c..6d662a37b445 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -4082,7 +4082,9 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
> >  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> >  	int rw = iov_iter_rw(iter);
> >  
> > -	if (f2fs_post_read_required(inode))
> > +	if (!fscrypt_dio_supported(iocb, iter))
> > +		return true;
> > +	if (fsverity_active(inode))
> 
> static inline bool f2fs_post_read_required(struct inode *inode)
> {
> 	return f2fs_encrypted_file(inode) || fsverity_active(inode) ||
> 		f2fs_compressed_file(inode);
> }
> 
> That's not correct, missed to check compression condition.
> 

Thanks Chao, great catch.  This used to be correct, but we missed that the
second f2fs_compressed_file() check got removed by commit b5f4684b5f5f
("f2fs: remove redundant compress inode check").

- Eric