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/*
* Copyright (c) 2000-2001 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef NODE_H
#define NODE_H
/* node.[ch] - abstract pool of nodes
*
* operators alloc, free, map, and unmap nodes.
*/
typedef size32_t nh_t;
#define NH_NULL SIZE32MAX
/* node_init - creates a new node abstraction.
* user reserves one byte per node for use by the node abstraction
*/
extern bool_t node_init(int fd, /* backing store */
off64_t off, /* offset into backing store */
size_t nodesz, /* node size */
ix_t nodehkix, /* my housekeeping byte */
size_t alignsz, /* node alignment requirement */
size64_t vmsz, /* abstractions's share of VM */
size64_t dir_nondir); /* num of dirs + nondirs */
/* node_sync - syncs up with existing node abstraction persistent state
*/
extern bool_t node_sync(int fd, off64_t off);
/* node_alloc - allocates a node, returning a handle.
* returns NULL handle if no space left.
*/
extern nh_t node_alloc(void);
/* node_map - returns a pointer to the node identified by the node handle.
* pointer remains valid until node_unmap called.
*/
extern void *node_map(nh_t node_handle);
/* node_unmap - unmaps the node.
* SIDE-EFFECT: sets *nodepp to 0.
*/
extern void node_unmap(nh_t node_handle, void **nodepp);
/* node_free - frees a previously allocated node.
* SIDE-EFFECT: sets *node_handlep to NODE_HANDLE_NULL.
*/
extern void node_free(nh_t *node_handlep);
#endif /* NODE_H */
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