Re: [PATCH] ext4: remove the null check of bio_vec page

From: Jan Kara <jack@suse.cz>
To: Tianxianting <tian.xianting@h3c.com>
Cc: Jan Kara <jack@suse.cz>, "tytso@mit.edu" <tytso@mit.edu>,
	"adilger.kernel@dilger.ca" <adilger.kernel@dilger.ca>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ext4: remove the null check of bio_vec page
Date: Fri, 23 Oct 2020 18:56:44 +0200	[thread overview]
Message-ID: <20201023165644.GG9119@quack2.suse.cz> (raw)
In-Reply-To: <113ad7d2cbfd43a9972ad37df66e5542@h3c.com>

On Fri 23-10-20 16:38:16, Tianxianting wrote:
> Thanks Jan
> Can be the patch applied?

Ted Tso is the ext4 maintainer so he should eventually pick up and apply
the patch. But since there's merge window currently open, I guess he's busy
shuffling patches to send to Linus. I'd expect he'll get to your patch in a
week or two.

								Honza

> 
> -----Original Message-----
> From: Jan Kara [mailto:jack@suse.cz] 
> Sent: Wednesday, October 21, 2020 6:25 PM
> To: tianxianting (RD) <tian.xianting@h3c.com>
> Cc: tytso@mit.edu; adilger.kernel@dilger.ca; jack@suse.cz; linux-ext4@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] ext4: remove the null check of bio_vec page
> 
> On Tue 20-10-20 16:22:01, Xianting Tian wrote:
> > bv_page can't be NULL in a valid bio_vec, so we can remove the NULL 
> > check, as we did in other places when calling 
> > bio_for_each_segment_all() to go through all bio_vec of a bio.
> > 
> > Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
> 
> Thanks for the patch. It looks good to me. You can add:
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> 
> 								Honza
> 
> > ---
> >  fs/ext4/page-io.c | 3 ---
> >  1 file changed, 3 deletions(-)
> > 
> > diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 
> > defd2e10d..cb135a944 100644
> > --- a/fs/ext4/page-io.c
> > +++ b/fs/ext4/page-io.c
> > @@ -111,9 +111,6 @@ static void ext4_finish_bio(struct bio *bio)
> >  		unsigned under_io = 0;
> >  		unsigned long flags;
> >  
> > -		if (!page)
> > -			continue;
> > -
> >  		if (fscrypt_is_bounce_page(page)) {
> >  			bounce_page = page;
> >  			page = fscrypt_pagecache_page(bounce_page);
> > --
> > 2.17.1
> > 
> --
> Jan Kara <jack@suse.com>
> SUSE Labs, CR
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR