linux-kernel - [068/107] nfsd4: fix break

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Message-Id: <20110708001659.393585376@clark.kroah.org>
Date:	Thu, 07 Jul 2011 17:16:40 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [068/107] nfsd4: fix break_lease flags on nfsd open

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------

From: "J. Bruce Fields" <bfields@...hat.com>

commit 105f4622104848ff1ee1f644d661bef9dec3eb27 upstream.

Thanks to Casey Bodley for pointing out that on a read open we pass 0,
instead of O_RDONLY, to break_lease, with the result that a read open is
treated like a write open for the purposes of lease breaking!

Reported-by: Casey Bodley <cbodley@...i.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/nfsd/vfs.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -699,7 +699,15 @@ nfsd_access(struct svc_rqst *rqstp, stru
 }
 #endif /* CONFIG_NFSD_V3 */
 
+static int nfsd_open_break_lease(struct inode *inode, int access)
+{
+	unsigned int mode;
 
+	if (access & NFSD_MAY_NOT_BREAK_LEASE)
+		return 0;
+	mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY;
+	return break_lease(inode, mode | O_NONBLOCK);
+}
 
 /*
  * Open an existing file or directory.
@@ -747,12 +755,7 @@ nfsd_open(struct svc_rqst *rqstp, struct
 	if (!inode->i_fop)
 		goto out;
 
-	/*
-	 * Check to see if there are any leases on this file.
-	 * This may block while leases are broken.
-	 */
-	if (!(access & NFSD_MAY_NOT_BREAK_LEASE))
-		host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0));
+	host_err = nfsd_open_break_lease(inode, access);
 	if (host_err) /* NOMEM or WOULDBLOCK */
 		goto out_nfserr;
 


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