linux-kernel - [PATCH 22/43] staging/lustre/llite: deadlock for page write

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Message-Id: <1459356495-2794775-23-git-send-email-green@linuxhacker.ru>
Date:	Wed, 30 Mar 2016 12:47:54 -0400
From:	green@...uxhacker.ru
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lustre Development List <lustre-devel@...ts.lustre.org>,
	Jinshan Xiong <jinshan.xiong@...el.com>,
	Oleg Drokin <green@...uxhacker.ru>
Subject: [PATCH 22/43] staging/lustre/llite: deadlock for page write

From: Jinshan Xiong <jinshan.xiong@...el.com>

Writing thread already locked page #1, and then wait for the
Writeback bit of page #2;

Ptlrpc thread is composing a write RPC, so it sets Writeback on
page #2 and tries to lock page #1 to make it ready.

Deadlocked.

Signed-off-by: Jinshan Xiong <jinshan.xiong@...el.com>
Reviewed-on: http://review.whamcloud.com/9036
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4540
Reviewed-by: wangdi <di.wang@...el.com>
Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
---
 drivers/staging/lustre/lustre/llite/rw26.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
index 50d8289..f87238b 100644
--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -512,7 +512,7 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
 
 	/* To avoid deadlock, try to lock page first. */
 	vmpage = grab_cache_page_nowait(mapping, index);
-	if (unlikely(!vmpage || PageDirty(vmpage))) {
+	if (unlikely(!vmpage || PageDirty(vmpage) || PageWriteback(vmpage))) {
 		struct ccc_io *cio = ccc_env_io(env);
 		struct cl_page_list *plist = &cio->u.write.cui_queue;
 
@@ -522,7 +522,7 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
 		 * more grants. It's okay for the dirty page to be the first
 		 * one in commit page list, though.
 		 */
-		if (vmpage && PageDirty(vmpage) && plist->pl_nr > 0) {
+		if (vmpage && plist->pl_nr > 0) {
 			unlock_page(vmpage);
 			page_cache_release(vmpage);
 			vmpage = NULL;
-- 
2.1.0