2882 implement libzfs_core
2883 changing "canmount" property to "on" should not always remount dataset
2900 "zfs snapshot" should be able to create multiple, arbitrary snapshots at once
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Chris Siden <christopher.siden@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Bill Pijewski <wdp@joyent.com>
Reviewed by: Dan Kruchinin <dan.kruchinin@gmail.com>

*** 41,50 ****
--- 41,51 ----
  #include <sys/mnttab.h>
  #include <sys/mntent.h>
  #include <sys/types.h>
  
  #include <libzfs.h>
+ #include <libzfs_core.h>
  
  #include "libzfs_impl.h"
  #include "zfs_prop.h"
  #include "zfeature_common.h"
  
*** 628,637 ****
--- 629,646 ----
                  return (NULL);
          }
  
          hdl->libzfs_sharetab = fopen("/etc/dfs/sharetab", "r");
  
+         if (libzfs_core_init() != 0) {
+                 (void) close(hdl->libzfs_fd);
+                 (void) fclose(hdl->libzfs_mnttab);
+                 (void) fclose(hdl->libzfs_sharetab);
+                 free(hdl);
+                 return (NULL);
+         }
+ 
          zfs_prop_init();
          zpool_prop_init();
          zpool_feature_init();
          libzfs_mnttab_init(hdl);
  
*** 645,660 ****
          if (hdl->libzfs_mnttab)
                  (void) fclose(hdl->libzfs_mnttab);
          if (hdl->libzfs_sharetab)
                  (void) fclose(hdl->libzfs_sharetab);
          zfs_uninit_libshare(hdl);
-         if (hdl->libzfs_log_str)
-                 (void) free(hdl->libzfs_log_str);
          zpool_free_handles(hdl);
          libzfs_fru_clear(hdl, B_TRUE);
          namespace_clear(hdl);
          libzfs_mnttab_fini(hdl);
          free(hdl);
  }
  
  libzfs_handle_t *
  zpool_get_handle(zpool_handle_t *zhp)
--- 654,668 ----
          if (hdl->libzfs_mnttab)
                  (void) fclose(hdl->libzfs_mnttab);
          if (hdl->libzfs_sharetab)
                  (void) fclose(hdl->libzfs_sharetab);
          zfs_uninit_libshare(hdl);
          zpool_free_handles(hdl);
          libzfs_fru_clear(hdl, B_TRUE);
          namespace_clear(hdl);
          libzfs_mnttab_fini(hdl);
+         libzfs_core_fini();
          free(hdl);
  }
  
  libzfs_handle_t *
  zpool_get_handle(zpool_handle_t *zhp)
*** 812,832 ****
  }
  
  int
  zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc)
  {
!         int error;
! 
!         zc->zc_history = (uint64_t)(uintptr_t)hdl->libzfs_log_str;
!         error = ioctl(hdl->libzfs_fd, request, zc);
!         if (hdl->libzfs_log_str) {
!                 free(hdl->libzfs_log_str);
!                 hdl->libzfs_log_str = NULL;
!         }
!         zc->zc_history = 0;
! 
!         return (error);
  }
  
  /*
   * ================================================================
   * API shared by zfs and zpool property management
--- 820,830 ----
  }
  
  int
  zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc)
  {
!         return (ioctl(hdl->libzfs_fd, request, zc));
  }
  
  /*
   * ================================================================
   * API shared by zfs and zpool property management