linux-kernel - [PATCH v6 7/7] locks: Disable LOCK_MAND support for MS

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Date:	Fri, 26 Apr 2013 16:04:21 +0400
From:	Pavel Shilovsky <piastry@...rsoft.ru>
To:	linux-kernel@...r.kernel.org
Cc:	linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, wine-devel@...ehq.org
Subject: [PATCH v6 7/7] locks: Disable LOCK_MAND support for MS_SHARELOCK mounts

Signed-off-by: Pavel Shilovsky <piastry@...rsoft.ru>
---
 fs/locks.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/locks.c b/fs/locks.c
index 25c3a49..7d67e0e 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1756,6 +1756,12 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
 		goto out;
 	}
 
+	/* Disable LOCK_MAND support for FS mounted with MS_SHARELOCK */
+	if ((cmd & LOCK_MAND) && IS_SHARELOCK(f.file->f_path.dentry->d_inode)) {
+		error = -EPERM;
+		goto out;
+	}
+
 	can_sleep = !(cmd & LOCK_NB);
 	cmd &= ~LOCK_NB;
 	unlock = (cmd == LOCK_UN);
-- 
1.8.1.5

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