linux-kernel - [PATCH V6 02/30] block: bio_set_pages_dirty can't see NULL bv_page in a valid bio

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Message-Id: <20180609123014.8861-3-ming.lei@redhat.com>
Date:   Sat,  9 Jun 2018 20:29:46 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>
Cc:     David Sterba <dsterba@...e.cz>, Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH V6 02/30] block: bio_set_pages_dirty can't see NULL bv_page in a valid bio_vec

From: Christoph Hellwig <hch@....de>

So don't bother handling it.

Reviewed-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/bio.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 3e7d117c3346..ebd3ca62e037 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1634,10 +1634,8 @@ void bio_set_pages_dirty(struct bio *bio)
 	int i;
 
 	bio_for_each_segment_all(bvec, bio, i) {
-		struct page *page = bvec->bv_page;
-
-		if (page && !PageCompound(page))
-			set_page_dirty_lock(page);
+		if (!PageCompound(bvec->bv_page))
+			set_page_dirty_lock(bvec->bv_page);
 	}
 }
 EXPORT_SYMBOL_GPL(bio_set_pages_dirty);
-- 
2.9.5