OS-1566 filesystem limits for ZFS datasets

@@ -18,10 +18,11 @@
  *
  * 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
 

@@ -68,11 +69,15 @@
         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 */
+
+        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;

@@ -129,12 +134,19 @@
     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, uint64_t space);
+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);