From 36bc306f6363f7990939e097a6d40939cd026fac Mon Sep 17 00:00:00 2001 From: jeff Date: Tue, 29 Mar 2005 10:10:51 +0000 Subject: - Upgrade a shared lock request to exclusive in ffs_vget() if we have to create the vnode. Sponsored by: Isilon Systems, Inc. --- sys/ufs/ffs/ffs_vfsops.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'sys/ufs') diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c index 04ae675..2a27502 100644 --- a/sys/ufs/ffs/ffs_vfsops.c +++ b/sys/ufs/ffs/ffs_vfsops.c @@ -1177,6 +1177,15 @@ ffs_vget(mp, ino, flags, vpp) return (error); /* + * We must promote to an exclusive lock for vnode creation. This + * can happen if lookup is passed LOCKSHARED. + */ + if ((flags & LK_TYPE_MASK) == LK_SHARED) { + flags &= ~LK_TYPE_MASK; + flags |= LK_EXCLUSIVE; + } + + /* * We do not lock vnode creation as it is believed to be too * expensive for such rare case as simultaneous creation of vnode * for same ino by different processes. We just allow them to race -- cgit v1.1