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c28b227942
Setup linux kernel module support, this includes: - zfs context for kernel/user - kernel module build system integration - kernel module macros - kernel module symbol export - kernel module options Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
205 lines
5.2 KiB
C
205 lines
5.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <sys/dmu.h>
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#include <sys/dmu_objset.h>
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#include <sys/dmu_tx.h>
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#include <sys/dnode.h>
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uint64_t
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dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize,
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dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
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{
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uint64_t object;
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uint64_t L2_dnode_count = DNODES_PER_BLOCK <<
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(DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT);
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dnode_t *dn = NULL;
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int restarted = B_FALSE;
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mutex_enter(&os->os_obj_lock);
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for (;;) {
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object = os->os_obj_next;
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/*
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* Each time we polish off an L2 bp worth of dnodes
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* (2^13 objects), move to another L2 bp that's still
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* reasonably sparse (at most 1/4 full). Look from the
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* beginning once, but after that keep looking from here.
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* If we can't find one, just keep going from here.
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*/
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if (P2PHASE(object, L2_dnode_count) == 0) {
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uint64_t offset = restarted ? object << DNODE_SHIFT : 0;
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int error = dnode_next_offset(DMU_META_DNODE(os),
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DNODE_FIND_HOLE,
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&offset, 2, DNODES_PER_BLOCK >> 2, 0);
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restarted = B_TRUE;
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if (error == 0)
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object = offset >> DNODE_SHIFT;
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}
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os->os_obj_next = ++object;
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/*
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* XXX We should check for an i/o error here and return
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* up to our caller. Actually we should pre-read it in
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* dmu_tx_assign(), but there is currently no mechanism
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* to do so.
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*/
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(void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE,
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FTAG, &dn);
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if (dn)
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break;
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if (dmu_object_next(os, &object, B_TRUE, 0) == 0)
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os->os_obj_next = object - 1;
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}
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dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
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dnode_rele(dn, FTAG);
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mutex_exit(&os->os_obj_lock);
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dmu_tx_add_new_object(tx, os, object);
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return (object);
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}
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int
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dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
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int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
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{
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dnode_t *dn;
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int err;
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if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx))
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return (EBADF);
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err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn);
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if (err)
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return (err);
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dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
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dnode_rele(dn, FTAG);
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dmu_tx_add_new_object(tx, os, object);
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return (0);
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}
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int
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dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
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int blocksize, dmu_object_type_t bonustype, int bonuslen)
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{
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dnode_t *dn;
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dmu_tx_t *tx;
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int nblkptr;
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int err;
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if (object == DMU_META_DNODE_OBJECT)
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return (EBADF);
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err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
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FTAG, &dn);
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if (err)
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return (err);
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if (dn->dn_type == ot && dn->dn_datablksz == blocksize &&
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dn->dn_bonustype == bonustype && dn->dn_bonuslen == bonuslen) {
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/* nothing is changing, this is a noop */
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dnode_rele(dn, FTAG);
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return (0);
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}
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if (bonustype == DMU_OT_SA) {
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nblkptr = 1;
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} else {
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nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT);
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}
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/*
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* If we are losing blkptrs or changing the block size this must
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* be a new file instance. We must clear out the previous file
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* contents before we can change this type of metadata in the dnode.
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*/
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if (dn->dn_nblkptr > nblkptr || dn->dn_datablksz != blocksize) {
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err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
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if (err)
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goto out;
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}
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tx = dmu_tx_create(os);
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dmu_tx_hold_bonus(tx, object);
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err = dmu_tx_assign(tx, TXG_WAIT);
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if (err) {
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dmu_tx_abort(tx);
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goto out;
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}
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dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);
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dmu_tx_commit(tx);
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out:
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dnode_rele(dn, FTAG);
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return (err);
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}
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int
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dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx)
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{
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dnode_t *dn;
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int err;
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ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx));
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err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
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FTAG, &dn);
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if (err)
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return (err);
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ASSERT(dn->dn_type != DMU_OT_NONE);
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dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
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dnode_free(dn, tx);
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dnode_rele(dn, FTAG);
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return (0);
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}
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int
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dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg)
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{
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uint64_t offset = (*objectp + 1) << DNODE_SHIFT;
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int error;
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error = dnode_next_offset(DMU_META_DNODE(os),
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(hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg);
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*objectp = offset >> DNODE_SHIFT;
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return (error);
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}
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#if defined(_KERNEL) && defined(HAVE_SPL)
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EXPORT_SYMBOL(dmu_object_alloc);
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EXPORT_SYMBOL(dmu_object_claim);
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EXPORT_SYMBOL(dmu_object_reclaim);
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EXPORT_SYMBOL(dmu_object_free);
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EXPORT_SYMBOL(dmu_object_next);
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#endif
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