From: colyli@suse.de To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Coly Li <colyli@suse.de>, Philipp Reisner <philipp.reisner@linbit.com>, Sagi Grimberg <sagi@grimberg.me> Subject: [PATCH v4 3/3] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Sat, 15 Aug 2020 20:42:54 +0800 [thread overview] Message-ID: <20200815124254.115076-3-colyli@suse.de> (raw) In-Reply-To: <20200815124254.115076-1-colyli@suse.de> From: Coly Li <colyli@suse.de> In _drbd_send_page() a page is checked by following code before sending it by kernel_sendpage(), (page_count(page) < 1) || PageSlab(page) If the check is true, this page won't be send by kernel_sendpage() and handled by sock_no_sendpage(). This kind of check is exactly what macro sendpage_ok() does, which is introduced into include/linux/net.h to solve a similar send page issue in nvme-tcp code. This patch uses macro sendpage_ok() to replace the open coded checks to page type and refcount in _drbd_send_page(), as a code cleanup. Signed-off-by: Coly Li <colyli@suse.de> Cc: Philipp Reisner <philipp.reisner@linbit.com> Cc: Sagi Grimberg <sagi@grimberg.me> --- Changelog: v3, introduce a more common sendpage_ok() v2, fix typo in patch subject v1, the initial version. drivers/block/drbd/drbd_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index cb687ccdbd96..55dc0c91781e 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1553,7 +1553,7 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa * put_page(); and would cause either a VM_BUG directly, or * __page_cache_release a page that would actually still be referenced * by someone, leading to some obscure delayed Oops somewhere else. */ - if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page)) + if (drbd_disable_sendpage || !sendpage_ok(page)) return _drbd_no_send_page(peer_device, page, offset, size, msg_flags); msg_flags |= MSG_NOSIGNAL; -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: colyli@suse.de To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Cc: Sagi Grimberg <sagi@grimberg.me>, netdev@vger.kernel.org, Philipp Reisner <philipp.reisner@linbit.com>, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Coly Li <colyli@suse.de> Subject: [PATCH v4 3/3] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Sat, 15 Aug 2020 20:42:54 +0800 [thread overview] Message-ID: <20200815124254.115076-3-colyli@suse.de> (raw) In-Reply-To: <20200815124254.115076-1-colyli@suse.de> From: Coly Li <colyli@suse.de> In _drbd_send_page() a page is checked by following code before sending it by kernel_sendpage(), (page_count(page) < 1) || PageSlab(page) If the check is true, this page won't be send by kernel_sendpage() and handled by sock_no_sendpage(). This kind of check is exactly what macro sendpage_ok() does, which is introduced into include/linux/net.h to solve a similar send page issue in nvme-tcp code. This patch uses macro sendpage_ok() to replace the open coded checks to page type and refcount in _drbd_send_page(), as a code cleanup. Signed-off-by: Coly Li <colyli@suse.de> Cc: Philipp Reisner <philipp.reisner@linbit.com> Cc: Sagi Grimberg <sagi@grimberg.me> --- Changelog: v3, introduce a more common sendpage_ok() v2, fix typo in patch subject v1, the initial version. drivers/block/drbd/drbd_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index cb687ccdbd96..55dc0c91781e 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1553,7 +1553,7 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa * put_page(); and would cause either a VM_BUG directly, or * __page_cache_release a page that would actually still be referenced * by someone, leading to some obscure delayed Oops somewhere else. */ - if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page)) + if (drbd_disable_sendpage || !sendpage_ok(page)) return _drbd_no_send_page(peer_device, page, offset, size, msg_flags); msg_flags |= MSG_NOSIGNAL; -- 2.26.2 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2020-08-15 22:13 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-15 12:42 [PATCH v4 1/3] net: introduce helper sendpage_ok() in include/linux/net.h colyli 2020-08-15 12:42 ` colyli 2020-08-15 12:42 ` [PATCH v2 2/3] nvme-tcp: check page by sendpage_ok() before calling kernel_sendpage() colyli 2020-08-15 12:42 ` colyli 2020-08-15 12:42 ` colyli [this message] 2020-08-15 12:42 ` [PATCH v4 3/3] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() colyli
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