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for nodes used in vm_radix. On architectures supporting direct mapping, also avoid to pre-allocate the KVA for such nodes. In order to do so make the operations derived from vm_radix_insert() to fail and handle all the deriving failure of those. vm_radix-wise introduce a new function called vm_radix_replace(), which can replace a leaf node, already present, with a new one, and take into account the possibility, during vm_radix_insert() allocation, that the operations on the radix trie can recurse. This means that if operations in vm_radix_insert() recursed vm_radix_insert() will start from scratch again. Sponsored by: EMC / Isilon storage division Reviewed by: alc (older version) Reviewed by: jeff Tested by: pho, scottl
50 lines
2.1 KiB
C
50 lines
2.1 KiB
C
/*
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* Copyright (c) 2013 EMC Corp.
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* Copyright (c) 2011 Jeffrey Roberson <jeff@freebsd.org>
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* Copyright (c) 2008 Mayur Shardul <mayur.shardul@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VM_RADIX_H_
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#define _VM_RADIX_H_
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#include <vm/_vm_radix.h>
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#ifdef _KERNEL
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void vm_radix_init(void);
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int vm_radix_insert(struct vm_radix *rtree, vm_page_t page);
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vm_page_t vm_radix_lookup(struct vm_radix *rtree, vm_pindex_t index);
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vm_page_t vm_radix_lookup_ge(struct vm_radix *rtree, vm_pindex_t index);
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vm_page_t vm_radix_lookup_le(struct vm_radix *rtree, vm_pindex_t index);
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void vm_radix_reclaim_allnodes(struct vm_radix *rtree);
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void vm_radix_remove(struct vm_radix *rtree, vm_pindex_t index);
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vm_page_t vm_radix_replace(struct vm_radix *rtree, vm_page_t newpage,
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vm_pindex_t index);
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#endif /* _KERNEL */
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#endif /* !_VM_RADIX_H_ */
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