From 0210925e420b2f938988d2f44a571ed45d741fd8 Mon Sep 17 00:00:00 2001
From: jeff <jeff@FreeBSD.org>
Date: Thu, 24 Mar 2005 07:31:38 +0000
Subject: [PATCH]  - Pass LK_EXCLUSIVE to VFS_ROOT() to satisfy the new flags
 argument.  For    now, all calls to VFS_ROOT() should still acquire exclusive
 locks.

Sponsored by:	Isilon Systems, Inc.
---
 sys/kern/vfs_export.c   |  2 +-
 sys/kern/vfs_extattr.c  |  2 +-
 sys/kern/vfs_lookup.c   |  2 +-
 sys/kern/vfs_mount.c    | 12 +++++++-----
 sys/kern/vfs_subr.c     |  2 +-
 sys/kern/vfs_syscalls.c |  2 +-
 6 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/sys/kern/vfs_export.c b/sys/kern/vfs_export.c
index c4dcd77f9126..fc904244c419 100644
--- a/sys/kern/vfs_export.c
+++ b/sys/kern/vfs_export.c
@@ -301,7 +301,7 @@ vfs_setpublicfs(mp, nep, argp)
 	bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
 	nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
 
-	if ((error = VFS_ROOT(mp, &rvp, curthread /* XXX */)))
+	if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
 		return (error);
 
 	if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
diff --git a/sys/kern/vfs_extattr.c b/sys/kern/vfs_extattr.c
index 162f16911e20..31861368259c 100644
--- a/sys/kern/vfs_extattr.c
+++ b/sys/kern/vfs_extattr.c
@@ -689,7 +689,7 @@ fchdir(td, uap)
 		if (vfs_busy(mp, 0, 0, td))
 			continue;
 		tvfslocked = VFS_LOCK_GIANT(mp);
-		error = VFS_ROOT(mp, &tdp, td);
+		error = VFS_ROOT(mp, LK_EXCLUSIVE, &tdp, td);
 		vfs_unbusy(mp, td);
 		if (error) {
 			VFS_UNLOCK_GIANT(tvfslocked);
diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
index dcbc15410631..979a9686abd6 100644
--- a/sys/kern/vfs_lookup.c
+++ b/sys/kern/vfs_lookup.c
@@ -584,7 +584,7 @@ unionlookup:
 			continue;
 		VOP_UNLOCK(dp, 0, td);
 		tvfslocked = VFS_LOCK_GIANT(mp);
-		error = VFS_ROOT(mp, &tdp, td);
+		error = VFS_ROOT(mp, LK_EXCLUSIVE, &tdp, td);
 		vfs_unbusy(mp, td);
 		if (error) {
 			VFS_UNLOCK_GIANT(tvfslocked);
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index a2fc3402f918..5ff2c20852a8 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -785,7 +785,7 @@ vfs_domount(
 		TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
 		mtx_unlock(&mountlist_mtx);
 		vfs_event_signal(NULL, VQ_MOUNT, 0);
-		if (VFS_ROOT(mp, &newdp, td))
+		if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td))
 			panic("mount: lost mount");
 		mountcheckdirs(vp, newdp);
 		vput(newdp);
@@ -946,7 +946,8 @@ dounmount(mp, flags, td)
 	 * vnode to the covered vnode.  For non-forced unmounts we want
 	 * such references to cause an EBUSY error.
 	 */
-	if ((flags & MNT_FORCE) && VFS_ROOT(mp, &fsrootvp, td) == 0) {
+	if ((flags & MNT_FORCE) &&
+	    VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) {
 		if (mp->mnt_vnodecovered != NULL)
 			mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
 		if (fsrootvp == rootvnode) {
@@ -963,7 +964,8 @@ dounmount(mp, flags, td)
 	vn_finished_write(mp);
 	if (error) {
 		/* Undo cdir/rdir and rootvnode changes made above. */
-		if ((flags & MNT_FORCE) && VFS_ROOT(mp, &fsrootvp, td) == 0) {
+		if ((flags & MNT_FORCE) &&
+		    VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) {
 			if (mp->mnt_vnodecovered != NULL)
 				mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
 			if (rootvnode == NULL) {
@@ -1006,7 +1008,7 @@ set_rootvnode(struct thread *td)
 {
 	struct proc *p;
 
-	if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode, td))
+	if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td))
 		panic("Cannot find root vnode");
 
 	p = td->td_proc;
@@ -1087,7 +1089,7 @@ devfs_fixup(struct thread *td)
 	mtx_unlock(&mountlist_mtx);
 	cache_purgevfs(mp);
 
-	VFS_ROOT(mp, &dvp, td);
+	VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td);
 	VI_LOCK(dvp);
 	dvp->v_iflag &= ~VI_MOUNT;
 	dvp->v_mountedhere = NULL;
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 9668b58b7468..bf12f5888ae3 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -2053,7 +2053,7 @@ vflush(mp, rootrefs, flags, td)
 		 * Get the filesystem root vnode. We can vput() it
 		 * immediately, since with rootrefs > 0, it won't go away.
 		 */
-		if ((error = VFS_ROOT(mp, &rootvp, td)) != 0)
+		if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rootvp, td)) != 0)
 			return (error);
 		vput(rootvp);
 
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 162f16911e20..31861368259c 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -689,7 +689,7 @@ fchdir(td, uap)
 		if (vfs_busy(mp, 0, 0, td))
 			continue;
 		tvfslocked = VFS_LOCK_GIANT(mp);
-		error = VFS_ROOT(mp, &tdp, td);
+		error = VFS_ROOT(mp, LK_EXCLUSIVE, &tdp, td);
 		vfs_unbusy(mp, td);
 		if (error) {
 			VFS_UNLOCK_GIANT(tvfslocked);