OS-1566 filesystem limits for ZFS datasets

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  
  #ifndef _SYS_DSL_DIR_H
  #define _SYS_DSL_DIR_H
  
*** 68,78 ****
          uint64_t dd_props_zapobj;
          uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
          uint64_t dd_flags;
          uint64_t dd_used_breakdown[DD_USED_NUM];
          uint64_t dd_clones; /* dsl_dir objects */
!         uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
  } dsl_dir_phys_t;
  
  struct dsl_dir {
          /* These are immutable; no lock needed: */
          uint64_t dd_object;
--- 69,83 ----
          uint64_t dd_props_zapobj;
          uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
          uint64_t dd_flags;
          uint64_t dd_used_breakdown[DD_USED_NUM];
          uint64_t dd_clones; /* dsl_dir objects */
! 
!         uint64_t dd_filesystem_count;
!         uint64_t dd_snapshot_count;
! 
!         uint64_t dd_pad[11]; /* pad out to 256 bytes for good measure */
  } dsl_dir_phys_t;
  
  struct dsl_dir {
          /* These are immutable; no lock needed: */
          uint64_t dd_object;
*** 129,140 ****
      dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
  int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
      uint64_t quota);
  int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
      uint64_t reservation);
  int dsl_dir_rename(dsl_dir_t *dd, const char *newname);
! int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space);
  int dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx);
  boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
  void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
      uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
  void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
--- 134,152 ----
      dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
  int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
      uint64_t quota);
  int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
      uint64_t reservation);
+ int dsl_dir_validate_fs_ss_limit(const char *, uint64_t, zfs_prop_t);
+ int dsl_dir_fscount_check(dsl_dir_t *, uint64_t, dsl_dir_t *);
+ void dsl_dir_fscount_adjust(dsl_dir_t *, dmu_tx_t *, int64_t, boolean_t,
+     boolean_t);
+ int dsl_snapcount_check(dsl_dir_t *, uint64_t, dsl_dir_t *);
+ void dsl_snapcount_adjust(dsl_dir_t *, dmu_tx_t *, int64_t, boolean_t);
  int dsl_dir_rename(dsl_dir_t *dd, const char *newname);
! int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
!     dsl_dir_t *moving_dd, uint64_t space, dmu_tx_t *tx);
  int dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx);
  boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
  void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
      uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
  void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);