linux-kernel - [PATCH 2/5] NFS: Don't clear PG_writeback until after we've processed unstable writes

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Message-Id: <20070420201239.7897.74094.stgit@heimdal.trondhjem.org>
Date:	Fri, 20 Apr 2007 16:12:40 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Florin Iucha <florin@...ha.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Chuck Lever <chuck.lever@...cle.com>,
	linux-kernel@...r.kernel.org, nfs@...ts.sourceforge.net
Subject: [PATCH 2/5] NFS: Don't clear PG_writeback until after we've processed unstable writes

From: Trond Myklebust <Trond.Myklebust@...app.com>

Ensure that we don't release the PG_writeback lock until after the page has
either been redirtied, or queued on the nfs_inode 'commit' list.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 fs/nfs/write.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 3ed4feb..8e94246 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -920,8 +920,8 @@ out_bad:
 		list_del(&data->pages);
 		nfs_writedata_release(data);
 	}
-	nfs_end_page_writeback(req->wb_page);
 	nfs_redirty_request(req);
+	nfs_end_page_writeback(req->wb_page);
 	nfs_clear_page_writeback(req);
 	return -ENOMEM;
 }
@@ -966,8 +966,8 @@ static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
 	while (!list_empty(head)) {
 		struct nfs_page *req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
-		nfs_end_page_writeback(req->wb_page);
 		nfs_redirty_request(req);
+		nfs_end_page_writeback(req->wb_page);
 		nfs_clear_page_writeback(req);
 	}
 	return -ENOMEM;
@@ -1002,8 +1002,8 @@ out_err:
 	while (!list_empty(head)) {
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
-		nfs_end_page_writeback(req->wb_page);
 		nfs_redirty_request(req);
+		nfs_end_page_writeback(req->wb_page);
 		nfs_clear_page_writeback(req);
 	}
 	return error;
-
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