Commit 0800c5f7 authored by ASANO Masahiro's avatar ASANO Masahiro Committed by Linus Torvalds
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[PATCH] fix posix lock on NFS



NFS client prevents mandatory lock, but there is a flaw on it; Locks are
possibly left if the mode is changed while locking.

This permits unlocking even if the mandatory lock bits are set.
Signed-off-by: default avatarASANO Masahiro <masano@tnes.nec.co.jp>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent d6f02913
......@@ -509,7 +509,8 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
return -EINVAL;
/* No mandatory locks over NFS */
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
fl->fl_type != F_UNLCK)
return -ENOLCK;
if (IS_GETLK(cmd))
......
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