From: Coly Li <colyli@suse.de> To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, netdev@vger.kernel.org, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, ceph-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Coly Li <colyli@suse.de>, Philipp Reisner <philipp.reisner@linbit.com>, Sagi Grimberg <sagi@grimberg.me> Subject: [PATCH v7 4/6] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Tue, 18 Aug 2020 21:12:25 +0800 [thread overview] Message-ID: <20200818131227.37020-5-colyli@suse.de> (raw) In-Reply-To: <20200818131227.37020-1-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> --- 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: Coly Li <colyli@suse.de> To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, netdev@vger.kernel.org, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, ceph-devel@vger.kernel.org Cc: Sagi Grimberg <sagi@grimberg.me>, Philipp Reisner <philipp.reisner@linbit.com>, linux-kernel@vger.kernel.org, Coly Li <colyli@suse.de> Subject: [PATCH v7 4/6] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Tue, 18 Aug 2020 21:12:25 +0800 [thread overview] Message-ID: <20200818131227.37020-5-colyli@suse.de> (raw) In-Reply-To: <20200818131227.37020-1-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> --- 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:[~2020-08-18 13:14 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-18 13:12 [PATCH v7 0/6] Introduce sendpage_ok() to detect misused sendpage in network related drivers Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 1/6] net: introduce helper sendpage_ok() in include/linux/net.h Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 16:24 ` Christoph Hellwig 2020-08-18 16:24 ` Christoph Hellwig 2020-08-18 16:33 ` Coly Li 2020-08-18 16:33 ` Coly Li 2020-08-18 19:49 ` Christoph Hellwig 2020-08-18 19:49 ` Christoph Hellwig 2020-08-19 4:22 ` Coly Li 2020-08-19 4:22 ` Coly Li 2020-09-23 8:43 ` Christoph Hellwig 2020-09-23 8:43 ` Christoph Hellwig 2020-09-23 8:45 ` Coly Li 2020-09-23 8:45 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 2/6] nvme-tcp: check page by sendpage_ok() before calling kernel_sendpage() Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 3/6] tcp: use sendpage_ok() to detect misused .sendpage Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` Coly Li [this message] 2020-08-18 13:12 ` [PATCH v7 4/6] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Coly Li 2020-08-18 13:12 ` [PATCH v7 5/6] scsi: libiscsi: use sendpage_ok() in iscsi_tcp_segment_map() Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 6/6] libceph: use sendpage_ok() in ceph_tcp_sendpage() Coly Li 2020-08-18 13:12 ` Coly Li
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