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List:       wine-devel
Subject:    [PATCH v6 7/7] locks: Disable LOCK_MAND support for MS_SHARELOCK mounts
From:       Pavel Shilovsky <piastry () etersoft ! ru>
Date:       2013-04-26 12:04:21
Message-ID: 1366977861-27678-8-git-send-email-piastry () etersoft ! ru
[Download RAW message or body]

Signed-off-by: Pavel Shilovsky <piastry@etersoft.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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