seg_xmem.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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 http://www.opensolaris.org/os/licensing.
* 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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_FS_SEG_XMEM_H
#define _SYS_FS_SEG_XMEM_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/map.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Statistics for segxmem operations.
*
* No explicit locking to protect these stats.
*/
struct segxmemcnt {
kstat_named_t sx_fault; /* number of segxmem_faults */
kstat_named_t sx_getmapflt; /* number of segxmem_getmaps */
kstat_named_t sx_release; /* releases with */
kstat_named_t sx_pagecreate; /* pagecreates */
};
#if defined(_KERNEL)
struct segxmem_crargs {
struct vnode *xma_vp; /* vnode maped from */
u_offset_t xma_offset; /* starting offset for mapping */
/* offset above could be invalid due to remaps, but ppa will be valid */
page_t ***xma_ppa; /* page list for this mapping */
uint_t xma_bshift; /* for converting offset to block # */
struct cred *xma_cred; /* credentials */
uchar_t xma_prot;
};
struct sx_prot {
struct sx_prot *spc_next; /* Next such one */
pgcnt_t spc_pageindex; /* First page with changed prot */
pgcnt_t spc_numpages; /* & number of such pages */
uchar_t spc_prot;
};
struct segxmem_data {
struct vnode *sxd_vp; /* vnode for this mapping */
offset_t sxd_offset; /* & initial offset */
/*
* The above may not be valid after remap, but ppa below will track
* the remaps.
*/
size_t sxd_bsize; /* block size */
uint_t sxd_bshift; /* for converting offset to block # */
size_t sxd_softlockcnt;
struct sx_prot *sxd_spc; /* linked list of changed protections */
uchar_t sxd_prot;
};
#define sx_blocks(seg, sxd) howmany((seg)->s_size, 1 << (sxd)->sxd_bshift)
/*
* Public seg_xmem segment operations.
*/
extern int segxmem_create(struct seg *, struct segxmem_crargs *);
/*
* extern faultcode_t segxmem_fault(struct hat *, struct seg *, caddr_t, size_t,
* enum fault_type, enum seg_rw);
*/
extern caddr_t segxmem_getmap(struct map *, struct vnode *, u_offset_t,
size_t, page_t **, enum seg_rw);
extern void segxmem_release(struct map *, caddr_t, size_t);
extern int segxmem_remap(struct seg *, struct vnode *vp, caddr_t, size_t,
page_t ***, uchar_t);
extern void segxmem_inval(struct seg *, struct vnode *, u_offset_t);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_SEG_XMEM_H */