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/*
* 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 by Delphix. All rights reserved.
*/
#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/dnode.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)
{
dnode_t *dn;
dmu_tx_t *tx;
int nblkptr;
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);
if (dn->dn_type == ot && dn->dn_datablksz == blocksize &&
dn->dn_bonustype == bonustype && dn->dn_bonuslen == bonuslen) {
/* nothing is changing, this is a noop */
dnode_rele(dn, FTAG);
return (0);
}
if (bonustype == DMU_OT_SA) {
nblkptr = 1;
} else {
nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT);
}
/*
* If we are losing blkptrs or changing the block size this must
* be a new file instance. We must clear out the previous file
* contents before we can change this type of metadata in the dnode.
*/
if (dn->dn_nblkptr > nblkptr || dn->dn_datablksz != blocksize) {
err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
if (err)
goto out;
}
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, object);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
goto out;
}
dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);
dmu_tx_commit(tx);
out:
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);
}
#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);
#endif
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