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85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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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) 2018 by Delphix. All rights reserved.
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*/
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#include <sys/objlist.h>
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#include <sys/zfs_context.h>
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objlist_t *
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objlist_create(void)
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{
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objlist_t *list = kmem_alloc(sizeof (*list), KM_SLEEP);
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list_create(&list->ol_list, sizeof (objlist_node_t),
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offsetof(objlist_node_t, on_node));
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list->ol_last_lookup = 0;
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return (list);
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}
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void
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objlist_destroy(objlist_t *list)
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{
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for (objlist_node_t *n = list_remove_head(&list->ol_list);
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n != NULL; n = list_remove_head(&list->ol_list)) {
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kmem_free(n, sizeof (*n));
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}
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list_destroy(&list->ol_list);
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kmem_free(list, sizeof (*list));
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}
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/*
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* This function looks through the objlist to see if the specified object number
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* is contained in the objlist. In the process, it will remove all object
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* numbers in the list that are smaller than the specified object number. Thus,
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* any lookup of an object number smaller than a previously looked up object
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* number will always return false; therefore, all lookups should be done in
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* ascending order.
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*/
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boolean_t
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objlist_exists(objlist_t *list, uint64_t object)
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{
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objlist_node_t *node = list_head(&list->ol_list);
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ASSERT3U(object, >=, list->ol_last_lookup);
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list->ol_last_lookup = object;
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while (node != NULL && node->on_object < object) {
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VERIFY3P(node, ==, list_remove_head(&list->ol_list));
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kmem_free(node, sizeof (*node));
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node = list_head(&list->ol_list);
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}
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return (node != NULL && node->on_object == object);
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}
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/*
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* The objlist is a list of object numbers stored in ascending order. However,
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* the insertion of new object numbers does not seek out the correct location to
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* store a new object number; instead, it appends it to the list for simplicity.
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* Thus, any users must take care to only insert new object numbers in ascending
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* order.
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*/
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void
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objlist_insert(objlist_t *list, uint64_t object)
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{
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objlist_node_t *node = kmem_zalloc(sizeof (*node), KM_SLEEP);
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node->on_object = object;
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#ifdef ZFS_DEBUG
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objlist_node_t *last_object = list_tail(&list->ol_list);
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uint64_t last_objnum = (last_object != NULL ? last_object->on_object :
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0);
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ASSERT3U(node->on_object, >, last_objnum);
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#endif
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list_insert_tail(&list->ol_list, node);
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}
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