From d94da54d9573b12d2d1107664273f7db5c5619dc Mon Sep 17 00:00:00 2001
From: jhb <jhb@FreeBSD.org>
Date: Fri, 23 Jan 2009 22:13:30 +0000
Subject: [PATCH] Use shared vnode locks for fchdir().

Submitted by:	ups
---
 sys/kern/vfs_syscalls.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 4d3978ab32b9..a910bf3eaad9 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -758,7 +758,7 @@ fchdir(td, uap)
 	VREF(vp);
 	fdrop(fp, td);
 	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
-	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
+	vn_lock(vp, LK_SHARED | LK_RETRY);
 	AUDIT_ARG(vnode, vp, ARG_VNODE1);
 	error = change_dir(vp, td);
 	while (!error && (mp = vp->v_mountedhere) != NULL) {
@@ -766,7 +766,7 @@ fchdir(td, uap)
 		if (vfs_busy(mp, 0))
 			continue;
 		tvfslocked = VFS_LOCK_GIANT(mp);
-		error = VFS_ROOT(mp, LK_EXCLUSIVE, &tdp, td);
+		error = VFS_ROOT(mp, LK_SHARED, &tdp, td);
 		vfs_unbusy(mp);
 		if (error) {
 			VFS_UNLOCK_GIANT(tvfslocked);