11083 support NFS server in zone
Portions contributed by: Dan Kruchinin <dan.kruchinin@nexenta.com>
Portions contributed by: Stepan Zastupov <stepan.zastupov@gmail.com>
Portions contributed by: Joyce McIntosh <joyce.mcintosh@nexenta.com>
Portions contributed by: Mike Zeller <mike@mikezeller.net>
Portions contributed by: Dan McDonald <danmcd@joyent.com>
Portions contributed by: Gordon Ross <gordon.w.ross@gmail.com>
Portions contributed by: Vitaliy Gusev <gusev.vitaliy@gmail.com>
Reviewed by: Rick McNeal <rick.mcneal@nexenta.com>
Reviewed by: Rob Gittins <rob.gittins@nexenta.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Jason King <jbk@joyent.com>
Reviewed by: C Fraire <cfraire@me.com>
Change-Id: I22f289d357503f9b48a0bc2482cc4328a6d43d16

@@ -16,16 +16,18 @@
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
+
 /*
  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+
 /*
- * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
+ * Copyright 2018 Nexenta Systems, Inc.
  */
 
 #include <sys/systm.h>
 #include <sys/cmn_err.h>
 #include <nfs/nfs.h>

@@ -131,10 +133,15 @@
         struct nfs4_svgetit_arg sarg;
         struct compound_state cs;
         struct statvfs64 sb;
 
         rfs4_init_compound_state(&cs);
+        /*
+         * This is global state checking, called once. We might be in
+         * non-global-zone context here (say a modload happens from a zone
+         * process) so in this case, we want the global-zone root vnode.
+         */
         cs.vp = rootvp;
         cs.fh.nfs_fh4_val = NULL;
         cs.cr = kcred;
 
         /*

@@ -1299,26 +1306,33 @@
         vnode_t *stubvp = NULL, *vp;
 
         vp = sarg->cs->vp;
         sarg->mntdfid_set = FALSE;
 
-        /* VROOT object, must untraverse */
-        if (vp->v_flag & VROOT) {
+        /*
+         * VROOT object or zone's root, must untraverse.
+         *
+         * NOTE: Not doing reality checks on curzone vs. compound
+         * state vnode because it will mismatch once at initialization
+         * if a non-global-zone triggers the module load, BUT in that case
+         * the vp is literally "/" which has VROOT set.
+         */
+        if ((vp->v_flag & VROOT) || VN_IS_CURZONEROOT(vp)) {
 
                 /* extra hold for vp since untraverse might rele */
                 VN_HOLD(vp);
-                stubvp = untraverse(vp);
+                stubvp = untraverse(vp, ZONE_ROOTVP());
 
                 /*
-                 * If vp/stubvp are same, we must be at system
+                 * If vp/stubvp are same, we must be at system-or-zone
                  * root because untraverse returned same vp
                  * for a VROOT object.  sarg->vap was setup
                  * before we got here, so there's no need to do
                  * another getattr -- just use the one in sarg.
                  */
                 if (VN_CMP(vp, stubvp)) {
-                        ASSERT(VN_CMP(vp, rootdir));
+                        ASSERT(VN_IS_CURZONEROOT(vp));
                         vap = sarg->vap;
                 } else {
                         va.va_mask = AT_NODEID;
                         vap = &va;
                         error = rfs4_vop_getattr(stubvp, vap, 0, sarg->cs->cr);

@@ -1373,14 +1387,14 @@
                 if (sarg->op == NFS4ATTR_SETIT)
                         error = EINVAL;
                 break;          /* this attr is supported */
         case NFS4ATTR_GETIT:
         case NFS4ATTR_VERIT:
-                if (! sarg->mntdfid_set)
+                if (!sarg->mntdfid_set)
                         error = rfs4_get_mntdfileid(cmd, sarg);
 
-                if (! error && sarg->mntdfid_set) {
+                if (!error && sarg->mntdfid_set) {
                         if (cmd == NFS4ATTR_GETIT)
                                 na->mounted_on_fileid = sarg->mounted_on_fileid;
                         else
                                 if (na->mounted_on_fileid !=
                                     sarg->mounted_on_fileid)

@@ -1593,21 +1607,25 @@
                 if (sarg->op == NFS4ATTR_SETIT || sarg->op == NFS4ATTR_VERIT)
                         error = EINVAL;
                 break;  /* this attr is supported */
 
         case NFS4ATTR_GETIT:
+        {
+                kstat_named_t *stat =
+                    sarg->cs->exi->exi_ne->ne_globals->svstat[NFS_V4];
+
                 fsl = fetch_referral(sarg->cs->vp, sarg->cs->cr);
                 if (fsl == NULL)
                         (void) memset(&(na->fs_locations), 0,
                             sizeof (fs_locations4));
                 else {
                         na->fs_locations = *fsl;
                         kmem_free(fsl, sizeof (fs_locations4));
                 }
-                global_svstat_ptr[4][NFS_REFERRALS].value.ui64++;
+                stat[NFS_REFERRALS].value.ui64++;
                 break;
-
+        }
         case NFS4ATTR_FREEIT:
                 if (sarg->op == NFS4ATTR_SETIT || sarg->op == NFS4ATTR_VERIT)
                         error = EINVAL;
                 rfs4_free_fs_locations4(&na->fs_locations);
                 break;