5382 pvn_getpages handles lengths <= PAGESIZE just fine

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
   */
  
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/systm.h>
*** 114,145 ****
          caddr_t addr,
          enum seg_rw rw,
          struct cred *cr,
          caller_context_t *ct)
  {
-         int err;
- 
          SWAPFS_PRINT(SWAP_VOPS, "swap_getpage: vp %p, off %llx, len %lx\n",
              (void *)vp, off, len, 0, 0);
  
          TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_GETPAGE,
              "swapfs getpage:vp %p off %llx len %ld",
              (void *)vp, off, len);
  
!         if (len <= PAGESIZE) {
!                 err = swap_getapage(vp, (u_offset_t)off, len, protp, pl, plsz,
!                     seg, addr, rw, cr);
!         } else {
!                 err = pvn_getpages(swap_getapage, vp, (u_offset_t)off, len,
!                     protp, pl, plsz, seg, addr, rw, cr);
!         }
! 
!         return (err);
  }
  
  /*
!  * Called from pvn_getpages or swap_getpage to get a particular page.
   */
  /*ARGSUSED*/
  static int
  swap_getapage(
          struct vnode *vp,
--- 115,137 ----
          caddr_t addr,
          enum seg_rw rw,
          struct cred *cr,
          caller_context_t *ct)
  {
          SWAPFS_PRINT(SWAP_VOPS, "swap_getpage: vp %p, off %llx, len %lx\n",
              (void *)vp, off, len, 0, 0);
  
          TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_GETPAGE,
              "swapfs getpage:vp %p off %llx len %ld",
              (void *)vp, off, len);
  
!         return (pvn_getpages(swap_getapage, vp, (u_offset_t)off, len, protp,
!             pl, plsz, seg, addr, rw, cr));
  }
  
  /*
!  * Called from pvn_getpages to get a particular page.
   */
  /*ARGSUSED*/
  static int
  swap_getapage(
          struct vnode *vp,