PSARC 2008/290 lofi mount
6384817 Need persistent lofi based mounts and direct mount(1m) support for lofi

*** 17,31 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
!  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "@(#)hsfs_vfsops.c      1.97    07/10/25 SMI"
  
  /*
   * VFS operations for High Sierra filesystem
   */
  
--- 17,31 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
!  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "@(#)hsfs_vfsops.c      1.98    08/05/07 SMI"
  
  /*
   * VFS operations for High Sierra filesystem
   */
  
*** 1341,1400 ****
  static int
  hs_getmdev(struct vfs *vfsp, char *fspec, int flags, dev_t *pdev, mode_t *mode,
      cred_t *cr)
  {
          int error;
!         struct vnode *vp;
          struct vattr vap;
          dev_t dev;
  
          /*
!          * Get the device to be mounted
           */
!         error = lookupname(fspec, (flags & MS_SYSSPACE) ?
!             UIO_SYSSPACE : UIO_USERSPACE, FOLLOW, NULLVPP, &vp);
          if (error) {
!                 if (error == ENOENT) {
!                         return (ENODEV);        /* needs translation */
                  }
!                 return (error);
          }
!         if (vp->v_type != VBLK) {
!                 VN_RELE(vp);
!                 return (ENOTBLK);
          }
          /*
!          * Can we read from the device?
           */
!         if ((error = VOP_ACCESS(vp, VREAD, 0, cr, NULL)) != 0 ||
!             (error = secpolicy_spec_open(cr, vp, FREAD)) != 0) {
!                 VN_RELE(vp);
!                 return (error);
!         }
  
          vap.va_mask = AT_MODE;          /* get protection mode */
!         (void) VOP_GETATTR(vp, &vap, 0, CRED(), NULL);
          *mode = vap.va_mode;
  
!         dev = *pdev = vp->v_rdev;
!         VN_RELE(vp);
  
          /*
           * Ensure that this device isn't already mounted,
           * unless this is a REMOUNT request or we are told to suppress
           * mount checks.
           */
          if ((flags & MS_NOCHECK) == 0) {
                  if (vfs_devmounting(dev, vfsp))
!                         return (EBUSY);
                  if (vfs_devismounted(dev) && !(flags & MS_REMOUNT))
!                         return (EBUSY);
          }
  
!         if (getmajor(*pdev) >= devcnt)
!                 return (ENXIO);
!         return (0);
  }
  
  static void
  hs_copylabel(struct hs_volume *hvp, unsigned char *label, int isjoliet)
  {
--- 1341,1426 ----
  static int
  hs_getmdev(struct vfs *vfsp, char *fspec, int flags, dev_t *pdev, mode_t *mode,
      cred_t *cr)
  {
          int error;
!         struct vnode *svp = NULL;
!         struct vnode *lvp = NULL;
!         struct vnode *bvp;
          struct vattr vap;
          dev_t dev;
+         enum uio_seg fromspace = (flags & MS_SYSSPACE) ?
+             UIO_SYSSPACE : UIO_USERSPACE;
  
          /*
!          * Look up the device/file to be mounted.
           */
!         error = lookupname(fspec, fromspace, FOLLOW, NULLVPP, &svp);
          if (error) {
!                 if (error == ENOENT)
!                         error = ENODEV;
!                 goto out;
          }
! 
!         error = vfs_get_lofi(vfsp, &lvp);
! 
!         if (error > 0) {
!                 if (error == ENOENT)
!                         error = ENODEV;
!                 goto out;
!         } else if (error == 0) {
!                 bvp = lvp;
!         } else {
!                 bvp = svp;
! 
!                 if (bvp->v_type != VBLK) {
!                         error = ENOTBLK;
!                         goto out;
                  }
! 
!                 if ((error = secpolicy_spec_open(cr, bvp, FREAD)) != 0)
!                         goto out;
          }
+ 
          /*
!          * Can we read from the device/file ?
           */
!         if ((error = VOP_ACCESS(svp, VREAD, 0, cr, NULL)) != 0)
!                 goto out;
  
          vap.va_mask = AT_MODE;          /* get protection mode */
!         (void) VOP_GETATTR(bvp, &vap, 0, CRED(), NULL);
          *mode = vap.va_mode;
  
!         dev = *pdev = bvp->v_rdev;
  
+         error = EBUSY;
+ 
          /*
           * Ensure that this device isn't already mounted,
           * unless this is a REMOUNT request or we are told to suppress
           * mount checks.
           */
          if ((flags & MS_NOCHECK) == 0) {
                  if (vfs_devmounting(dev, vfsp))
!                         goto out;
                  if (vfs_devismounted(dev) && !(flags & MS_REMOUNT))
!                         goto out;
          }
  
!         if (getmajor(*pdev) >= devcnt) {
!                 error = ENXIO;
!                 goto out;
!         }
! 
!         error = 0;
! out:
!         if (svp != NULL)
!                 VN_RELE(svp);
!         if (lvp != NULL)
!                 VN_RELE(lvp);
!         return (error);
  }
  
  static void
  hs_copylabel(struct hs_volume *hvp, unsigned char *label, int isjoliet)
  {