Illumos 3897 - zfs filesystem and snapshot limits

3897 zfs filesystem and snapshot limits
Author: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Christopher Siden <christopher.siden@delphix.com>

References:
  https://www.illumos.org/issues/3897
  https://github.com/illumos/illumos-gate/commit/a2afb61

Porting Notes:

dsl_dataset_snapshot_check(): reduce stack usage using kmem_alloc().

Ported-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

include/sys/dmu_send.h

@@ -23,7 +23,7 @@
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
- * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  */
 
 #ifndef _DMU_SEND_H
@@ -56,6 +56,7 @@ typedef struct dmu_recv_cookie {
 	zio_cksum_t drc_cksum;
 	uint64_t drc_newsnapobj;
 	void *drc_owner;
+	cred_t *drc_cred;
 } dmu_recv_cookie_t;
 
 int dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,

include/sys/dsl_dataset.h

@@ -21,7 +21,7 @@
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
- * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  */
 
@@ -266,7 +266,7 @@ int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
     dsl_dataset_t *origin_head, dmu_tx_t *tx);
 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
-    dmu_tx_t *tx, boolean_t recv);
+    dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr);
 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
     dmu_tx_t *tx);
 
@@ -276,7 +276,8 @@ void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
     uint64_t *value);
-int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
+int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
+    boolean_t adj_cnt);
 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
 void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);

include/sys/dsl_dir.h

@@ -21,6 +21,7 @@
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2014, Joyent, Inc. All rights reserved.
  */
 
 #ifndef	_SYS_DSL_DIR_H
@@ -38,6 +39,14 @@ extern "C" {
 
 struct dsl_dataset;
 
+/*
+ * DD_FIELD_* are strings that are used in the "extensified" dsl_dir zap object.
+ * They should be of the format <reverse-dns>:<field>.
+ */
+
+#define	DD_FIELD_FILESYSTEM_COUNT	"com.joyent:filesystem_count"
+#define	DD_FIELD_SNAPSHOT_COUNT		"com.joyent:snapshot_count"
+
 typedef enum dd_used {
 	DD_USED_HEAD,
 	DD_USED_SNAP,
@@ -129,8 +138,13 @@ 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_activate_fs_ss_limit(const char *);
+int dsl_fs_ss_limit_check(dsl_dir_t *, uint64_t, zfs_prop_t, dsl_dir_t *,
+    cred_t *);
+void dsl_fs_ss_count_adjust(dsl_dir_t *, int64_t, const char *, dmu_tx_t *);
 int dsl_dir_rename(const char *oldname, 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,
+    uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *);
 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);
@@ -138,6 +152,8 @@ void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
 timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
 void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
     dmu_tx_t *tx);
+void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
+boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
 
 /* internal reserved dir name */
 #define	MOS_DIR_NAME "$MOS"

include/sys/fs/zfs.h

@@ -23,7 +23,7 @@
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
- * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  */
 
 /* Portions Copyright 2010 Robert Milkowski */
@@ -142,6 +142,10 @@ typedef enum {
 	ZFS_PROP_LOGICALUSED,
 	ZFS_PROP_LOGICALREFERENCED,
 	ZFS_PROP_INCONSISTENT,		/* not exposed to the user */
+	ZFS_PROP_FILESYSTEM_LIMIT,
+	ZFS_PROP_SNAPSHOT_LIMIT,
+	ZFS_PROP_FILESYSTEM_COUNT,
+	ZFS_PROP_SNAPSHOT_COUNT,
 	ZFS_PROP_SNAPDEV,
 	ZFS_PROP_ACLTYPE,
 	ZFS_PROP_SELINUX_CONTEXT,