mirror of
https://git.proxmox.com/git/mirror_zfs
synced 2025-10-31 13:29:32 +00:00
ab6d9bd89a
The commit b192a2c (Remove avl_size field from struct avl_tree) uses a
def _KERNEL to decide to include avl_pad or not, but this _KERNEL is
defined in sys/sysmacros.h. If avl.h and sysmacros.h are not included
in the right order, it can cause a headache when working on a zfs
related kernel module.
Add sysmacros.h in avl_impl.h to fix. sysmacros.h is also removed
from spa.h as it's reduntant.
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
Co-authored-by: Youzhong Yang <yyang@mathworks.com>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
167 lines
4.9 KiB
C
167 lines
4.9 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License, Version 1.0 only
|
|
* (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 https://opensource.org/licenses/CDDL-1.0.
|
|
* 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 2004 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
|
|
#ifndef _AVL_IMPL_H
|
|
#define _AVL_IMPL_H extern __attribute__((visibility("default")))
|
|
|
|
|
|
/*
|
|
* This is a private header file. Applications should not directly include
|
|
* this file.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/sysmacros.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/*
|
|
* generic AVL tree implementation for kernel use
|
|
*
|
|
* There are 5 pieces of information stored for each node in an AVL tree
|
|
*
|
|
* pointer to less than child
|
|
* pointer to greater than child
|
|
* a pointer to the parent of this node
|
|
* an indication [0/1] of which child I am of my parent
|
|
* a "balance" (-1, 0, +1) indicating which child tree is taller
|
|
*
|
|
* Since they only need 3 bits, the last two fields are packed into the
|
|
* bottom bits of the parent pointer on 64 bit machines to save on space.
|
|
*/
|
|
|
|
#ifndef _LP64
|
|
|
|
struct avl_node {
|
|
struct avl_node *avl_child[2]; /* left/right children */
|
|
struct avl_node *avl_parent; /* this node's parent */
|
|
unsigned short avl_child_index; /* my index in parent's avl_child[] */
|
|
short avl_balance; /* balance value: -1, 0, +1 */
|
|
};
|
|
|
|
#define AVL_XPARENT(n) ((n)->avl_parent)
|
|
#define AVL_SETPARENT(n, p) ((n)->avl_parent = (p))
|
|
|
|
#define AVL_XCHILD(n) ((n)->avl_child_index)
|
|
#define AVL_SETCHILD(n, c) ((n)->avl_child_index = (unsigned short)(c))
|
|
|
|
#define AVL_XBALANCE(n) ((n)->avl_balance)
|
|
#define AVL_SETBALANCE(n, b) ((n)->avl_balance = (short)(b))
|
|
|
|
#else /* _LP64 */
|
|
|
|
/*
|
|
* for 64 bit machines, avl_pcb contains parent pointer, balance and child_index
|
|
* values packed in the following manner:
|
|
*
|
|
* |63 3| 2 |1 0 |
|
|
* |-------------------------------------|-----------------|-------------|
|
|
* | avl_parent hi order bits | avl_child_index | avl_balance |
|
|
* | | | + 1 |
|
|
* |-------------------------------------|-----------------|-------------|
|
|
*
|
|
*/
|
|
struct avl_node {
|
|
struct avl_node *avl_child[2]; /* left/right children nodes */
|
|
uintptr_t avl_pcb; /* parent, child_index, balance */
|
|
};
|
|
|
|
/*
|
|
* macros to extract/set fields in avl_pcb
|
|
*
|
|
* pointer to the parent of the current node is the high order bits
|
|
*/
|
|
#define AVL_XPARENT(n) ((struct avl_node *)((n)->avl_pcb & ~7))
|
|
#define AVL_SETPARENT(n, p) \
|
|
((n)->avl_pcb = (((n)->avl_pcb & 7) | (uintptr_t)(p)))
|
|
|
|
/*
|
|
* index of this node in its parent's avl_child[]: bit #2
|
|
*/
|
|
#define AVL_XCHILD(n) (((n)->avl_pcb >> 2) & 1)
|
|
#define AVL_SETCHILD(n, c) \
|
|
((n)->avl_pcb = (uintptr_t)(((n)->avl_pcb & ~4) | ((c) << 2)))
|
|
|
|
/*
|
|
* balance indication for a node, lowest 2 bits. A valid balance is
|
|
* -1, 0, or +1, and is encoded by adding 1 to the value to get the
|
|
* unsigned values of 0, 1, 2.
|
|
*/
|
|
#define AVL_XBALANCE(n) ((int)(((n)->avl_pcb & 3) - 1))
|
|
#define AVL_SETBALANCE(n, b) \
|
|
((n)->avl_pcb = (uintptr_t)((((n)->avl_pcb & ~3) | ((b) + 1))))
|
|
|
|
#endif /* _LP64 */
|
|
|
|
|
|
|
|
/*
|
|
* switch between a node and data pointer for a given tree
|
|
* the value of "o" is tree->avl_offset
|
|
*/
|
|
#define AVL_NODE2DATA(n, o) ((void *)((uintptr_t)(n) - (o)))
|
|
#define AVL_DATA2NODE(d, o) ((struct avl_node *)((uintptr_t)(d) + (o)))
|
|
|
|
|
|
|
|
/*
|
|
* macros used to create/access an avl_index_t
|
|
*/
|
|
#define AVL_INDEX2NODE(x) ((avl_node_t *)((x) & ~1))
|
|
#define AVL_INDEX2CHILD(x) ((x) & 1)
|
|
#define AVL_MKINDEX(n, c) ((avl_index_t)(n) | (c))
|
|
|
|
|
|
/*
|
|
* The tree structure. The fields avl_root, avl_compar, and avl_offset come
|
|
* first since they are needed for avl_find(). We want them to fit into
|
|
* a single 64 byte cache line to make avl_find() as fast as possible.
|
|
*/
|
|
struct avl_tree {
|
|
struct avl_node *avl_root; /* root node in tree */
|
|
int (*avl_compar)(const void *, const void *);
|
|
size_t avl_offset; /* offsetof(type, avl_link_t field) */
|
|
ulong_t avl_numnodes; /* number of nodes in the tree */
|
|
#ifndef _KERNEL
|
|
size_t avl_pad; /* For backwards ABI compatibility. */
|
|
#endif
|
|
};
|
|
|
|
|
|
/*
|
|
* This will only by used via AVL_NEXT() or AVL_PREV()
|
|
*/
|
|
_AVL_IMPL_H void *avl_walk(struct avl_tree *, void *, int);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _AVL_IMPL_H */
|