[mirror_zfs-debian.git] / module / zfs / dmu_object.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013, 2014 by Delphix. All rights reserved.
 * Copyright 2014 HybridCluster. All rights reserved.
 */

#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/dnode.h>
#include <sys/zap.h>
#include <sys/zfeature.h>

uint64_t
dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize,
    dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
{
	uint64_t object;
	uint64_t L2_dnode_count = DNODES_PER_BLOCK <<
	    (DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT);
	dnode_t *dn = NULL;
	int restarted = B_FALSE;

	mutex_enter(&os->os_obj_lock);
	for (;;) {
		object = os->os_obj_next;
		/*
		 * Each time we polish off an L2 bp worth of dnodes
		 * (2^13 objects), move to another L2 bp that's still
		 * reasonably sparse (at most 1/4 full).  Look from the
		 * beginning once, but after that keep looking from here.
		 * If we can't find one, just keep going from here.
		 */
		if (P2PHASE(object, L2_dnode_count) == 0) {
			uint64_t offset = restarted ? object << DNODE_SHIFT : 0;
			int error = dnode_next_offset(DMU_META_DNODE(os),
			    DNODE_FIND_HOLE,
			    &offset, 2, DNODES_PER_BLOCK >> 2, 0);
			restarted = B_TRUE;
			if (error == 0)
				object = offset >> DNODE_SHIFT;
		}
		os->os_obj_next = ++object;

		/*
		 * XXX We should check for an i/o error here and return
		 * up to our caller.  Actually we should pre-read it in
		 * dmu_tx_assign(), but there is currently no mechanism
		 * to do so.
		 */
		(void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE,
		    FTAG, &dn);
		if (dn)
			break;

		if (dmu_object_next(os, &object, B_TRUE, 0) == 0)
			os->os_obj_next = object - 1;
	}

	dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
	dnode_rele(dn, FTAG);

	mutex_exit(&os->os_obj_lock);

	dmu_tx_add_new_object(tx, os, object);
	return (object);
}

int
dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
{
	dnode_t *dn;
	int err;

	if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx))
		return (SET_ERROR(EBADF));

	err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn);
	if (err)
		return (err);
	dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
	dnode_rele(dn, FTAG);

	dmu_tx_add_new_object(tx, os, object);
	return (0);
}

int
dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
{
	dnode_t *dn;
	int err;

	if (object == DMU_META_DNODE_OBJECT)
		return (SET_ERROR(EBADF));

	err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
	    FTAG, &dn);
	if (err)
		return (err);

	dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);

	dnode_rele(dn, FTAG);
	return (err);
}

int
dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx)
{
	dnode_t *dn;
	int err;

	ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx));

	err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
	    FTAG, &dn);
	if (err)
		return (err);

	ASSERT(dn->dn_type != DMU_OT_NONE);
	dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
	dnode_free(dn, tx);
	dnode_rele(dn, FTAG);

	return (0);
}

int
dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg)
{
	uint64_t offset = (*objectp + 1) << DNODE_SHIFT;
	int error;

	error = dnode_next_offset(DMU_META_DNODE(os),
	    (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg);

	*objectp = offset >> DNODE_SHIFT;

	return (error);
}

/*
 * Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the
 * refcount on SPA_FEATURE_EXTENSIBLE_DATASET.
 *
 * Only for use from syncing context, on MOS objects.
 */
void
dmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type,
    dmu_tx_t *tx)
{
	dnode_t *dn;

	ASSERT(dmu_tx_is_syncing(tx));

	VERIFY0(dnode_hold(mos, object, FTAG, &dn));
	if (dn->dn_type == DMU_OTN_ZAP_METADATA) {
		dnode_rele(dn, FTAG);
		return;
	}
	ASSERT3U(dn->dn_type, ==, old_type);
	ASSERT0(dn->dn_maxblkid);
	dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type =
	    DMU_OTN_ZAP_METADATA;
	dnode_setdirty(dn, tx);
	dnode_rele(dn, FTAG);

	mzap_create_impl(mos, object, 0, 0, tx);

	spa_feature_incr(dmu_objset_spa(mos),
	    SPA_FEATURE_EXTENSIBLE_DATASET, tx);
}

void
dmu_object_free_zapified(objset_t *mos, uint64_t object, dmu_tx_t *tx)
{
	dnode_t *dn;
	dmu_object_type_t t;

	ASSERT(dmu_tx_is_syncing(tx));

	VERIFY0(dnode_hold(mos, object, FTAG, &dn));
	t = dn->dn_type;
	dnode_rele(dn, FTAG);

	if (t == DMU_OTN_ZAP_METADATA) {
		spa_feature_decr(dmu_objset_spa(mos),
		    SPA_FEATURE_EXTENSIBLE_DATASET, tx);
	}
	VERIFY0(dmu_object_free(mos, object, tx));
}

#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(dmu_object_alloc);
EXPORT_SYMBOL(dmu_object_claim);
EXPORT_SYMBOL(dmu_object_reclaim);
EXPORT_SYMBOL(dmu_object_free);
EXPORT_SYMBOL(dmu_object_next);
EXPORT_SYMBOL(dmu_object_zapify);
EXPORT_SYMBOL(dmu_object_free_zapified);
#endif
Commit	Line	Data
34dc7c2f BB	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21	/*
428870ff	22	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
ea04106b AX	23	* Copyright (c) 2013, 2014 by Delphix. All rights reserved.
ea04106b AX	24	* Copyright 2014 HybridCluster. All rights reserved.
34dc7c2f BB	25	*/
34dc7c2f BB	26
34dc7c2f BB	27	#include <sys/dmu.h>
	28	#include <sys/dmu_objset.h>
	29	#include <sys/dmu_tx.h>
	30	#include <sys/dnode.h>
ea04106b AX	31	#include <sys/zap.h>
ea04106b AX	32	#include <sys/zfeature.h>
34dc7c2f BB	33
	34	uint64_t
	35	dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize,
	36	dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
	37	{
34dc7c2f BB	38	uint64_t object;
34dc7c2f BB	39	uint64_t L2_dnode_count = DNODES_PER_BLOCK <<
572e2857	40	(DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT);
34dc7c2f BB	41	dnode_t *dn = NULL;
	42	int restarted = B_FALSE;
	43
428870ff	44	mutex_enter(&os->os_obj_lock);
34dc7c2f	45	for (;;) {
428870ff	46	object = os->os_obj_next;
34dc7c2f BB	47	/*
	48	* Each time we polish off an L2 bp worth of dnodes
	49	* (2^13 objects), move to another L2 bp that's still
	50	* reasonably sparse (at most 1/4 full). Look from the
	51	* beginning once, but after that keep looking from here.
	52	* If we can't find one, just keep going from here.
	53	*/
	54	if (P2PHASE(object, L2_dnode_count) == 0) {
	55	uint64_t offset = restarted ? object << DNODE_SHIFT : 0;
572e2857	56	int error = dnode_next_offset(DMU_META_DNODE(os),
b128c09f BB	57	DNODE_FIND_HOLE,
b128c09f BB	58	&offset, 2, DNODES_PER_BLOCK >> 2, 0);
34dc7c2f BB	59	restarted = B_TRUE;
	60	if (error == 0)
	61	object = offset >> DNODE_SHIFT;
	62	}
428870ff	63	os->os_obj_next = ++object;
34dc7c2f BB	64
	65	/*
	66	* XXX We should check for an i/o error here and return
	67	* up to our caller. Actually we should pre-read it in
	68	* dmu_tx_assign(), but there is currently no mechanism
	69	* to do so.
	70	*/
428870ff	71	(void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE,
34dc7c2f BB	72	FTAG, &dn);
	73	if (dn)
	74	break;
	75
	76	if (dmu_object_next(os, &object, B_TRUE, 0) == 0)
428870ff	77	os->os_obj_next = object - 1;
34dc7c2f BB	78	}
	79
	80	dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
	81	dnode_rele(dn, FTAG);
	82
428870ff	83	mutex_exit(&os->os_obj_lock);
34dc7c2f BB	84
	85	dmu_tx_add_new_object(tx, os, object);
	86	return (object);
	87	}
	88
	89	int
	90	dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
	91	int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
	92	{
	93	dnode_t *dn;
	94	int err;
	95
	96	if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx))
a08ee875	97	return (SET_ERROR(EBADF));
34dc7c2f	98
428870ff	99	err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn);
34dc7c2f BB	100	if (err)
	101	return (err);
	102	dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
	103	dnode_rele(dn, FTAG);
	104
	105	dmu_tx_add_new_object(tx, os, object);
	106	return (0);
	107	}
	108
	109	int
	110	dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
ea04106b	111	int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
34dc7c2f BB	112	{
	113	dnode_t *dn;
	114	int err;
	115
9babb374	116	if (object == DMU_META_DNODE_OBJECT)
a08ee875	117	return (SET_ERROR(EBADF));
34dc7c2f	118
428870ff	119	err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
34dc7c2f BB	120	FTAG, &dn);
	121	if (err)
	122	return (err);
9babb374	123
34dc7c2f	124	dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);
9babb374	125
34dc7c2f	126	dnode_rele(dn, FTAG);
9babb374	127	return (err);
34dc7c2f BB	128	}
	129
	130	int
	131	dmu_object_free(objset_t os, uint64_t object, dmu_tx_t tx)
	132	{
	133	dnode_t *dn;
	134	int err;
	135
	136	ASSERT(object != DMU_META_DNODE_OBJECT \|\| dmu_tx_private_ok(tx));
	137
428870ff	138	err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
34dc7c2f BB	139	FTAG, &dn);
	140	if (err)
	141	return (err);
	142
	143	ASSERT(dn->dn_type != DMU_OT_NONE);
b128c09f	144	dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
34dc7c2f BB	145	dnode_free(dn, tx);
	146	dnode_rele(dn, FTAG);
	147
	148	return (0);
	149	}
	150
	151	int
	152	dmu_object_next(objset_t os, uint64_t objectp, boolean_t hole, uint64_t txg)
	153	{
	154	uint64_t offset = (*objectp + 1) << DNODE_SHIFT;
	155	int error;
	156
572e2857	157	error = dnode_next_offset(DMU_META_DNODE(os),
b128c09f	158	(hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg);
34dc7c2f BB	159
	160	*objectp = offset >> DNODE_SHIFT;
	161
	162	return (error);
	163	}
c28b2279	164
ea04106b AX	165	/*
	166	* Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the
	167	* refcount on SPA_FEATURE_EXTENSIBLE_DATASET.
	168	*
	169	* Only for use from syncing context, on MOS objects.
	170	*/
	171	void
	172	dmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type,
	173	dmu_tx_t *tx)
	174	{
	175	dnode_t *dn;
	176
	177	ASSERT(dmu_tx_is_syncing(tx));
	178
	179	VERIFY0(dnode_hold(mos, object, FTAG, &dn));
	180	if (dn->dn_type == DMU_OTN_ZAP_METADATA) {
	181	dnode_rele(dn, FTAG);
	182	return;
	183	}
	184	ASSERT3U(dn->dn_type, ==, old_type);
	185	ASSERT0(dn->dn_maxblkid);
	186	dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type =
	187	DMU_OTN_ZAP_METADATA;
	188	dnode_setdirty(dn, tx);
	189	dnode_rele(dn, FTAG);
	190
	191	mzap_create_impl(mos, object, 0, 0, tx);
	192
	193	spa_feature_incr(dmu_objset_spa(mos),
	194	SPA_FEATURE_EXTENSIBLE_DATASET, tx);
	195	}
	196
	197	void
	198	dmu_object_free_zapified(objset_t mos, uint64_t object, dmu_tx_t tx)
	199	{
	200	dnode_t *dn;
	201	dmu_object_type_t t;
	202
	203	ASSERT(dmu_tx_is_syncing(tx));
	204
	205	VERIFY0(dnode_hold(mos, object, FTAG, &dn));
	206	t = dn->dn_type;
	207	dnode_rele(dn, FTAG);
	208
	209	if (t == DMU_OTN_ZAP_METADATA) {
	210	spa_feature_decr(dmu_objset_spa(mos),
	211	SPA_FEATURE_EXTENSIBLE_DATASET, tx);
	212	}
	213	VERIFY0(dmu_object_free(mos, object, tx));
	214	}
	215
c28b2279 BB	216	#if defined(_KERNEL) && defined(HAVE_SPL)
	217	EXPORT_SYMBOL(dmu_object_alloc);
	218	EXPORT_SYMBOL(dmu_object_claim);
	219	EXPORT_SYMBOL(dmu_object_reclaim);
	220	EXPORT_SYMBOL(dmu_object_free);
	221	EXPORT_SYMBOL(dmu_object_next);
ea04106b AX	222	EXPORT_SYMBOL(dmu_object_zapify);
ea04106b AX	223	EXPORT_SYMBOL(dmu_object_free_zapified);
c28b2279	224	#endif