space_map.h revision d6e555bdd793b8bc8fe57d5f12c3d69c813d0661
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_SPACE_MAP_H
#define _SYS_SPACE_MAP_H
#ifdef __cplusplus
extern "C" {
#endif
typedef struct space_map_ops space_map_ops_t;
typedef struct space_map {
void *sm_ppd; /* picker-private data */
} space_map_t;
typedef struct space_seg {
} space_seg_t;
typedef struct space_ref {
} space_ref_t;
typedef struct space_map_obj {
struct space_map_ops {
};
/*
* debug entry
*
* 1 3 10 50
* ,---+--------+------------+---------------------------------.
* | 1 | action | syncpass | txg (lower bits) |
* `---+--------+------------+---------------------------------'
* 63 62 60 59 50 49 0
*
*
*
* non-debug entry
*
* 1 47 1 15
* ,-----------------------------------------------------------.
* | 0 | offset (sm_shift units) | type | run |
* `-----------------------------------------------------------'
* 63 62 17 16 15 0
*/
/* All this stuff takes and returns bytes */
#define SM_ALLOC 0x0
#define SM_FREE 0x1
/*
* The data for a given space map can be kept on blocks of any size.
* Larger blocks entail fewer i/o operations, but they also cause the
* DMU to keep more data in-core, and also to waste more i/o bandwidth
* when only a few blocks have changed since the last transaction group.
* This could use a lot more research, but for now, set the freelist
* block size to 4k (2^12).
*/
#define SPACE_MAP_BLOCKSHIFT 12
extern void space_map_ref_create(avl_tree_t *t);
extern void space_map_ref_destroy(avl_tree_t *t);
extern void space_map_ref_add_seg(avl_tree_t *t,
extern void space_map_ref_add_map(avl_tree_t *t,
extern void space_map_ref_generate_map(avl_tree_t *t,
#ifdef __cplusplus
}
#endif
#endif /* _SYS_SPACE_MAP_H */