Index: zfs_vfsops.c
===================================================================
RCS file: /zoo/pjd/repo/src/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c,v
retrieving revision 1.12
diff -u -p -r1.12 zfs_vfsops.c
--- zfs_vfsops.c	10 Sep 2007 19:58:14 -0000	1.12
+++ zfs_vfsops.c	7 Nov 2007 12:39:14 -0000
@@ -988,6 +988,8 @@ zfs_init(void)
 
 	printf("ZFS filesystem version " ZFS_VERSION_STRING "\n");
 
+	zgd_done_init();
+
 	/*
 	 * Initialize .zfs directory structures
 	 */
@@ -1012,6 +1014,7 @@ zfs_fini(void)
 	zfsctl_fini();
 	zfs_znode_fini();
 	zfs_vnodes_adjust_back();
+	zgd_done_fini();
 }
 
 int
Index: zfs_vnops.c
===================================================================
RCS file: /zoo/pjd/repo/src/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c,v
retrieving revision 1.24
diff -u -p -r1.24 zfs_vnops.c
--- zfs_vnops.c	24 Jul 2007 15:00:43 -0000	1.24
+++ zfs_vnops.c	9 Nov 2007 22:20:26 -0000
@@ -856,21 +860,79 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
 	return (0);
 }
 
+static TAILQ_HEAD(, zgd) zgd_done = TAILQ_HEAD_INITIALIZER(zgd_done);
+static struct mtx zgd_done_mtx;
+static int zgd_done_exit = 0;
+MTX_SYSINIT(zgd_done, &zgd_done_mtx, "zgd", MTX_DEF);
+static int zfs_done_count = 0;
+SYSCTL_DECL(_vfs_zfs);
+SYSCTL_INT(_vfs_zfs, OID_AUTO, zgd_done_count, CTLFLAG_RW, &zfs_done_count, 0, "");
+
+static void
+zgd_done_worker(void *arg)
+{
+	zgd_t *zgd;
+	vnode_t *vp;
+	int vfslocked;
+
+	for (;;) {
+		mtx_lock(&zgd_done_mtx);
+		zgd = TAILQ_FIRST(&zgd_done);
+		if (zgd == NULL) {
+			if (zgd_done_exit) {
+				zgd_done_exit = 2;
+				mtx_unlock(&zgd_done_mtx);
+				wakeup(&zgd_done_exit);
+				kproc_exit(0);
+			}
+			msleep(&zgd_done, &zgd_done_mtx, PRIBIO | PDROP, "zgd", 0);
+			continue;
+		}
+		TAILQ_REMOVE(&zgd_done, zgd, zgd_next);
+		zfs_done_count++;
+		mtx_unlock(&zgd_done_mtx);
+		vp = zgd->zgd_vnode;
+		vfslocked = VFS_LOCK_GIANT(vp->v_vfsp);
+		VN_RELE(vp);
+		VFS_UNLOCK_GIANT(vfslocked);
+		kmem_free(zgd, sizeof (zgd_t));
+	}
+}
+
+void
+zgd_done_init(void)
+{
+
+	kproc_create(zgd_done_worker, NULL, NULL, 0, 0, "zgd_done");
+}
+
+void
+zgd_done_fini(void)
+{
+
+	mtx_lock(&zgd_done_mtx);
+	zgd_done_exit = 1;
+	wakeup(&zgd_done);
+	while (zgd_done_exit != 2)
+		msleep(&zgd_done_exit, &zgd_done_mtx, PRIBIO, "zgd_fini", 0);
+	mtx_unlock(&zgd_done_mtx);
+}
+
 void
 zfs_get_done(dmu_buf_t *db, void *vzgd)
 {
 	zgd_t *zgd = (zgd_t *)vzgd;
 	rl_t *rl = zgd->zgd_rl;
 	vnode_t *vp = ZTOV(rl->r_zp);
-	int vfslocked;
 
-	vfslocked = VFS_LOCK_GIANT(vp->v_vfsp);
 	dmu_buf_rele(db, vzgd);
 	zfs_range_unlock(rl);
-	VN_RELE(vp);
+	zgd->zgd_vnode = vp;
 	zil_add_vdev(zgd->zgd_zilog, DVA_GET_VDEV(BP_IDENTITY(zgd->zgd_bp)));
-	kmem_free(zgd, sizeof (zgd_t));
-	VFS_UNLOCK_GIANT(vfslocked);
+	mtx_lock(&zgd_done_mtx);
+	TAILQ_INSERT_TAIL(&zgd_done, zgd, zgd_next);
+	mtx_unlock(&zgd_done_mtx);
+	wakeup(&zgd_done);
 }
 
 /*
Index: sys/zil.h
===================================================================
RCS file: /zoo/pjd/repo/src/sys/contrib/opensolaris/uts/common/fs/zfs/sys/zil.h,v
retrieving revision 1.1
diff -u -p -r1.1 zil.h
--- sys/zil.h	6 Apr 2007 01:09:03 -0000	1.1
+++ sys/zil.h	7 Nov 2007 12:45:00 -0000
@@ -222,10 +222,12 @@ typedef struct itx {
  * zgd_t is passed through dmu_sync() to the callback routine zfs_get_done()
  * to handle the cleanup of the dmu_sync() buffer write
  */
-typedef struct {
+typedef struct zgd {
 	zilog_t		*zgd_zilog;	/* zilog */
 	blkptr_t	*zgd_bp;	/* block pointer */
 	struct rl	*zgd_rl;	/* range lock */
+	vnode_t		*zgd_vnode;
+	TAILQ_ENTRY(zgd)	 zgd_next;
 } zgd_t;
 
 
@@ -267,6 +269,9 @@ extern void	zil_resume(zilog_t *zilog);
 
 extern void	zil_add_vdev(zilog_t *zilog, uint64_t vdev);
 
+extern void	zgd_done_init(void);
+extern void	zgd_done_fini(void);
+
 extern int zil_disable;
 
 #ifdef	__cplusplus