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Diffstat (limited to 'sys/uvm/uvm_vnode.h')
| -rw-r--r-- | sys/uvm/uvm_vnode.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/sys/uvm/uvm_vnode.h b/sys/uvm/uvm_vnode.h new file mode 100644 index 00000000000..64636bc15a3 --- /dev/null +++ b/sys/uvm/uvm_vnode.h @@ -0,0 +1,110 @@ +/* $OpenBSD: uvm_vnode.h,v 1.11 2001/12/19 08:58:07 art Exp $ */ +/* $NetBSD: uvm_vnode.h,v 1.9 2000/03/26 20:54:48 kleink Exp $ */ + +/* + * + * Copyright (c) 1997 Charles D. Cranor and Washington University. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Charles D. Cranor and + * Washington University. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * from: Id: uvm_vnode.h,v 1.1.2.4 1997/10/03 21:18:24 chuck Exp + */ + +#ifndef _UVM_UVM_VNODE_H_ +#define _UVM_UVM_VNODE_H_ + +/* + * uvm_vnode.h + * + * vnode handle into the VM system. + */ + +/* + * the uvm_vnode structure. put at the top of the vnode data structure. + * this allows: + * (struct vnode *) == (struct uvm_vnode *) == (struct uvm_object *) + */ + +struct uvm_vnode { + struct uvm_object u_obj; /* the actual VM object */ + int u_flags; /* flags */ + int u_nio; /* number of running I/O requests */ + voff_t u_size; /* size of object */ + + /* the following entry is locked by uvn_wl_lock */ + LIST_ENTRY(uvm_vnode) u_wlist; /* list of writeable vnode objects */ + + /* the following entry is locked by uvn_sync_lock */ + SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* vnode objects due for a "sync" */ +}; + +/* + * u_flags values + */ +#define UVM_VNODE_VALID 0x001 /* we are attached to the vnode */ +#define UVM_VNODE_CANPERSIST 0x002 /* we can persist after ref == 0 */ +#define UVM_VNODE_ALOCK 0x004 /* uvn_attach is locked out */ +#define UVM_VNODE_DYING 0x008 /* final detach/terminate in + progress */ +#define UVM_VNODE_RELKILL 0x010 /* uvn should be killed by releasepg + when final i/o is done */ +#define UVM_VNODE_WANTED 0x020 /* someone is waiting for alock, + dying, or relkill to clear */ +#define UVM_VNODE_VNISLOCKED 0x040 /* underlying vnode struct is locked + (valid when DYING is true) */ +#define UVM_VNODE_IOSYNC 0x080 /* I/O sync in progress ... setter + sleeps on &uvn->u_nio */ +#define UVM_VNODE_IOSYNCWANTED 0x100 /* a process is waiting for the + i/o sync to clear so it can do + i/o */ +#define UVM_VNODE_WRITEABLE 0x200 /* uvn has pages that are writeable */ + +/* + * UVM_VNODE_BLOCKED: any condition that should new processes from + * touching the vnode [set WANTED and sleep to wait for it to clear] + */ +#define UVM_VNODE_BLOCKED (UVM_VNODE_ALOCK|UVM_VNODE_DYING|UVM_VNODE_RELKILL) + +#ifdef _KERNEL + +/* + * prototypes + */ + +#if 0 +/* + * moved uvn_attach to uvm_extern.h because uvm_vnode.h is needed to + * include sys/vnode.h, and files that include sys/vnode.h don't know + * what a vm_prot_t is. + */ +struct uvm_object *uvn_attach __P((void *, vm_prot_t)); +#endif + +#endif /* _KERNEL */ + +#endif /* _UVM_UVM_VNODE_H_ */ |