linux-kernel - [PATCH] [GFS2] return conflicts for GETLK

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Date:	Mon,  9 Jul 2007 17:02:44 +0100
From:	swhiteho@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	cluster-devel@...hat.com, David Teigland <teigland@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH] [GFS2] return conflicts for GETLK

From: David Teigland <teigland@...hat.com>

We weren't returning the correct result when GETLK found a conflict,
which is indicated by userspace passing back a 1.

Signed-off-by: Abhijith Das <adas redhat com>
Signed-off-by: David Teigland <teigland redhat com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
index 1dc7680..fba1f1d 100644
--- a/fs/gfs2/locking/dlm/plock.c
+++ b/fs/gfs2/locking/dlm/plock.c
@@ -254,16 +254,20 @@ int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
 	}
 	spin_unlock(&ops_lock);
 
+	/* info.rv from userspace is 1 for conflict, 0 for no-conflict,
+	   -ENOENT if there are no locks on the file */
+
 	rv = op->info.rv;
 
 	fl->fl_type = F_UNLCK;
 	if (rv == -ENOENT)
 		rv = 0;
-	else if (rv == 0 && op->info.pid != fl->fl_pid) {
+	else if (rv > 0) {
 		fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
 		fl->fl_pid = op->info.pid;
 		fl->fl_start = op->info.start;
 		fl->fl_end = op->info.end;
+		rv = 0;
 	}
 
 	kfree(op);
-- 
1.5.1.2

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