linux-kernel - [PATCH 14/23] vfs: Teach flock to use file_hotplug

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Date:	Mon,  1 Jun 2009 14:50:39 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>, Tejun Heo <tj@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Eric W. Biederman" <ebiederm@...well.arastra.com>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 14/23] vfs: Teach flock to use file_hotplug_lock

From: Eric W. Biederman <ebiederm@...well.arastra.com>

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 fs/locks.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index ec3deea..f74794e 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1584,9 +1584,13 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
 	    !(filp->f_mode & (FMODE_READ|FMODE_WRITE)))
 		goto out_putf;
 
+	error = -EIO;
+	if (!file_hotplug_read_trylock(filp))
+		goto out_putf;
+
 	error = flock_make_lock(filp, &lock, cmd);
 	if (error)
-		goto out_putf;
+		goto out_unlock;
 	if (can_sleep)
 		lock->fl_flags |= FL_SLEEP;
 
@@ -1604,6 +1608,8 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
  out_free:
 	locks_free_lock(lock);
 
+ out_unlock:
+	file_hotplug_read_unlock(filp);
  out_putf:
 	fput(filp);
  out:
-- 
1.6.3.1.54.g99dd.dirty

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