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Fri, 21 Feb 2020 04:24:52 +0000 To: Matthew Wilcox , References: <20200219210103.32400-1-willy@infradead.org> <20200219210103.32400-5-willy@infradead.org> X-Nvconfidentiality: public From: John Hubbard Message-ID: <89a2e3d1-df95-f006-24d9-76a4b7dd230b@nvidia.com> Date: Thu, 20 Feb 2020 20:24:52 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200219210103.32400-5-willy@infradead.org> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) Content-Language: en-US DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1582259079; bh=ASKxt3bijyoYwdw1pDufntJpHzO9oNcu8Dw674S+ZbU=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=heUrjhw3xqeEYQuBuoBasbu56gpWlnwZt+AdI2wq+B9NZbvczA0FSHtDGsaVb4Naf bnLZHSctgsoXIEuM1CeqQs2bSg86B5wpOR88JYaRMGaVNCFZ0llOWVBqfWBe1dfYIU BUwh2YAMS+RWhS/AXveX566mq203Kwd9VMWWIOhSUurQzAI72ujnD9tt6+SnD57HYI MgI6ngKNa6Eh0y5HdQDTDz6lnM06+eXX5yP8YrN+QsAaNtRrwPlFUiL3IiVJfgaM4Y DJpi7QNVd6PQYwtQElVUeLezKB5OQAGRgilG6WKFgkE2WbMHVP2VGJNm3q3F0+FJmu 6lrj9yx0IYl2Q== X-Headers-End: 1j4zs5-00Cgg1-1M Subject: Re: [f2fs-dev] [PATCH v7 04/24] mm: Move readahead nr_pages check into read_pages X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-mm@kvack.org, ocfs2-devel@oss.oracle.com, linux-ext4@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-btrfs@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2/19/20 1:00 PM, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" > > Simplify the callers by moving the check for nr_pages and the BUG_ON > into read_pages(). > > Signed-off-by: Matthew Wilcox (Oracle) > --- > mm/readahead.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) > Looks nice, Reviewed-by: John Hubbard thanks, -- John Hubbard NVIDIA > diff --git a/mm/readahead.c b/mm/readahead.c > index 61b15b6b9e72..9fcd4e32b62d 100644 > --- a/mm/readahead.c > +++ b/mm/readahead.c > @@ -119,6 +119,9 @@ static void read_pages(struct address_space *mapping, struct file *filp, > struct blk_plug plug; > unsigned page_idx; > > + if (!nr_pages) > + return; > + > blk_start_plug(&plug); > > if (mapping->a_ops->readpages) { > @@ -138,6 +141,8 @@ static void read_pages(struct address_space *mapping, struct file *filp, > > out: > blk_finish_plug(&plug); > + > + BUG_ON(!list_empty(pages)); > } > > /* > @@ -180,8 +185,7 @@ void __do_page_cache_readahead(struct address_space *mapping, > * contiguous pages before continuing with the next > * batch. > */ > - if (nr_pages) > - read_pages(mapping, filp, &page_pool, nr_pages, > + read_pages(mapping, filp, &page_pool, nr_pages, > gfp_mask); > nr_pages = 0; > continue; > @@ -202,9 +206,7 @@ void __do_page_cache_readahead(struct address_space *mapping, > * uptodate then the caller will launch readpage again, and > * will then handle the error. > */ > - if (nr_pages) > - read_pages(mapping, filp, &page_pool, nr_pages, gfp_mask); > - BUG_ON(!list_empty(&page_pool)); > + read_pages(mapping, filp, &page_pool, nr_pages, gfp_mask); > } > > /* > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel