From: Trond Myklebust <Trond.Myklebust@netapp.com>
To: linux-nfs@vger.kernel.org
Subject: [PATCH] NFS: Prevent another deadlock in nfs_release_page()
Date: Fri, 19 Mar 2010 15:35:10 -0400 [thread overview]
Message-ID: <1269027310.10771.7.camel@localhost.localdomain> (raw)
From: Trond Myklebust <Trond.Myklebust@netapp.com>
We should not attempt to free the page if __GFP_FS is not set. Otherwise we
can deadlock as per
http://bugzilla.kernel.org/show_bug.cgi?id=15578
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
fs/nfs/file.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index ae8d022..ae0d927 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -491,7 +491,8 @@ static int nfs_release_page(struct page *page, gfp_t gfp)
{
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
- if (gfp & __GFP_WAIT)
+ /* Only do I/O if gfp is a superset of GFP_KERNEL */
+ if ((gfp & GFP_KERNEL) == GFP_KERNEL)
nfs_wb_page(page->mapping->host, page);
/* If PagePrivate() is set, then the page is not freeable */
if (PagePrivate(page))
reply other threads:[~2010-03-19 19:35 UTC|newest]
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