linux-kernel - [PATCH 1/2] dlm: initialize file_lock struct in GETLK before copying conflicting lock

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Message-Id: <1232651764-10799-2-git-send-email-jlayton@redhat.com>
Date:	Thu, 22 Jan 2009 14:16:03 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	bfields@...ldses.org, cluster-devel@...hat.com, teigland@...hat.com
Subject: [PATCH 1/2] dlm: initialize file_lock struct in GETLK before copying conflicting lock

dlm_posix_get fills out the relevant fields in the file_lock before
returning when there is a lock conflict, but doesn't clean out any of
the other fields in the file_lock.

When nfsd does a NFSv4 lockt call, it sets the fl_lmops to
nfsd_posix_mng_ops before calling the lower fs. When the lock comes back
after testing a lock on GFS2, it still has that field set. This confuses
nfsd into thinking that the file_lock is a nfsd4 lock.

Fix this by making DLM reinitialize the file_lock before copying the
fields from the conflicting lock.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/dlm/plock.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index eba87ff..ca46f11 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -304,7 +304,9 @@ int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 	if (rv == -ENOENT)
 		rv = 0;
 	else if (rv > 0) {
+		locks_init_lock(fl);
 		fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
+		fl->fl_flags = FL_POSIX;
 		fl->fl_pid = op->info.pid;
 		fl->fl_start = op->info.start;
 		fl->fl_end = op->info.end;
-- 
1.5.5.6

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