linux-kernel - Re: post 2.6.21 regression in F

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Message-ID: <20070510213527.GY13719@fieldses.org>
Date:	Thu, 10 May 2007 17:35:27 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Doug Chapman <doug.chapman@...com>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	Marc Eshel <eshel@...aden.ibm.com>
Subject: Re: post 2.6.21 regression in F_GETLK

On Thu, May 10, 2007 at 05:04:21PM -0400, bfields wrote:
> On Thu, May 10, 2007 at 05:01:05PM -0400, Doug Chapman wrote:
> > You are partly right on the test however note that it is using a start
> > and len that are specific to the RDLCK so that should _only_ conflict
> > with that lock.  I did notice that the LTP test is taking a new lock on
> > the entire file which should be blocked by eithe rthe RDLCK or the WRLCK
> > and it doesn't check both, I plan on fixing that once this is resolved.
> > 
> > But, much more importantly F_GETLK is returning F_UNLCK saying that
> > there was no conflict at all.
> 
> Argh, OK.  I still can't see the problem yet, then.  What filesystem is
> this on?

Oh, cripes.  I'm a loser.  Next to figure out what's up with the
connectathon locking tests that they pass when GETLK never finds a
conflicting lock....

--b.

diff --git a/fs/locks.c b/fs/locks.c
index 53b0cd1..7fd2d17 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -670,7 +670,6 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
 {
 	struct file_lock *cfl;
 
-	fl->fl_type = F_UNLCK;
 	lock_kernel();
 	for (cfl = filp->f_path.dentry->d_inode->i_flock; cfl; cfl = cfl->fl_next) {
 		if (!IS_POSIX(cfl))
@@ -682,7 +681,8 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
 		__locks_copy_lock(fl, cfl);
 		unlock_kernel();
 		return 1;
-	}
+	} else
+		fl->fl_type = F_UNLCK;
 	unlock_kernel();
 	return 0;
 }
-
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