1ba4a712dd
This bring huge amount of changes, I'll enumerate only user-visible changes: - Delegated Administration Allows regular users to perform ZFS operations, like file system creation, snapshot creation, etc. - L2ARC Level 2 cache for ZFS - allows to use additional disks for cache. Huge performance improvements mostly for random read of mostly static content. - slog Allow to use additional disks for ZFS Intent Log to speed up operations like fsync(2). - vfs.zfs.super_owner Allows regular users to perform privileged operations on files stored on ZFS file systems owned by him. Very careful with this one. - chflags(2) Not all the flags are supported. This still needs work. - ZFSBoot Support to boot off of ZFS pool. Not finished, AFAIK. Submitted by: dfr - Snapshot properties - New failure modes Before if write requested failed, system paniced. Now one can select from one of three failure modes: - panic - panic on write error - wait - wait for disk to reappear - continue - serve read requests if possible, block write requests - Refquota, refreservation properties Just quota and reservation properties, but don't count space consumed by children file systems, clones and snapshots. - Sparse volumes ZVOLs that don't reserve space in the pool. - External attributes Compatible with extattr(2). - NFSv4-ACLs Not sure about the status, might not be complete yet. Submitted by: trasz - Creation-time properties - Regression tests for zpool(8) command. Obtained from: OpenSolaris
196 lines
4.7 KiB
C
196 lines
4.7 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 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/zfs_context.h>
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#include <sys/refcount.h>
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#if defined(DEBUG) || !defined(_KERNEL)
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#ifdef _KERNEL
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int reference_tracking_enable = FALSE; /* runs out of memory too easily */
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#else
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int reference_tracking_enable = TRUE;
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#endif
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int reference_history = 4; /* tunable */
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static kmem_cache_t *reference_cache;
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static kmem_cache_t *reference_history_cache;
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void
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refcount_sysinit(void)
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{
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reference_cache = kmem_cache_create("reference_cache",
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sizeof (reference_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
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reference_history_cache = kmem_cache_create("reference_history_cache",
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sizeof (uint64_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
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}
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void
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refcount_fini(void)
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{
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kmem_cache_destroy(reference_cache);
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kmem_cache_destroy(reference_history_cache);
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}
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void
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refcount_create(refcount_t *rc)
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{
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mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
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list_create(&rc->rc_list, sizeof (reference_t),
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offsetof(reference_t, ref_link));
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list_create(&rc->rc_removed, sizeof (reference_t),
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offsetof(reference_t, ref_link));
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rc->rc_count = 0;
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rc->rc_removed_count = 0;
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}
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void
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refcount_destroy_many(refcount_t *rc, uint64_t number)
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{
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reference_t *ref;
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ASSERT(rc->rc_count == number);
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while (ref = list_head(&rc->rc_list)) {
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list_remove(&rc->rc_list, ref);
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kmem_cache_free(reference_cache, ref);
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}
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list_destroy(&rc->rc_list);
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while (ref = list_head(&rc->rc_removed)) {
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list_remove(&rc->rc_removed, ref);
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kmem_cache_free(reference_history_cache, ref->ref_removed);
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kmem_cache_free(reference_cache, ref);
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}
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list_destroy(&rc->rc_removed);
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mutex_destroy(&rc->rc_mtx);
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}
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void
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refcount_destroy(refcount_t *rc)
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{
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refcount_destroy_many(rc, 0);
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}
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int
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refcount_is_zero(refcount_t *rc)
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{
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ASSERT(rc->rc_count >= 0);
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return (rc->rc_count == 0);
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}
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int64_t
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refcount_count(refcount_t *rc)
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{
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ASSERT(rc->rc_count >= 0);
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return (rc->rc_count);
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}
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int64_t
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refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
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{
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reference_t *ref;
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int64_t count;
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if (reference_tracking_enable) {
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ref = kmem_cache_alloc(reference_cache, KM_SLEEP);
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ref->ref_holder = holder;
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ref->ref_number = number;
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}
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mutex_enter(&rc->rc_mtx);
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ASSERT(rc->rc_count >= 0);
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if (reference_tracking_enable)
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list_insert_head(&rc->rc_list, ref);
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rc->rc_count += number;
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count = rc->rc_count;
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mutex_exit(&rc->rc_mtx);
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return (count);
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}
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int64_t
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refcount_add(refcount_t *rc, void *holder)
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{
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return (refcount_add_many(rc, 1, holder));
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}
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int64_t
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refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
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{
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reference_t *ref;
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int64_t count;
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mutex_enter(&rc->rc_mtx);
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ASSERT(rc->rc_count >= number);
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if (!reference_tracking_enable) {
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rc->rc_count -= number;
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count = rc->rc_count;
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mutex_exit(&rc->rc_mtx);
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return (count);
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}
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for (ref = list_head(&rc->rc_list); ref;
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ref = list_next(&rc->rc_list, ref)) {
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if (ref->ref_holder == holder && ref->ref_number == number) {
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list_remove(&rc->rc_list, ref);
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if (reference_history > 0) {
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ref->ref_removed =
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kmem_cache_alloc(reference_history_cache,
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KM_SLEEP);
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list_insert_head(&rc->rc_removed, ref);
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rc->rc_removed_count++;
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if (rc->rc_removed_count >= reference_history) {
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ref = list_tail(&rc->rc_removed);
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list_remove(&rc->rc_removed, ref);
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kmem_cache_free(reference_history_cache,
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ref->ref_removed);
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kmem_cache_free(reference_cache, ref);
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rc->rc_removed_count--;
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}
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} else {
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kmem_cache_free(reference_cache, ref);
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}
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rc->rc_count -= number;
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count = rc->rc_count;
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mutex_exit(&rc->rc_mtx);
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return (count);
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}
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}
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panic("No such hold %p on refcount %llx", holder,
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(u_longlong_t)(uintptr_t)rc);
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return (-1);
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}
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int64_t
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refcount_remove(refcount_t *rc, void *holder)
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{
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return (refcount_remove_many(rc, 1, holder));
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}
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#endif
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