Annotation of sys/uvm/uvm_vnode.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: uvm_vnode.h,v 1.12 2002/03/14 01:27:19 millert Exp $ */
! 2: /* $NetBSD: uvm_vnode.h,v 1.9 2000/03/26 20:54:48 kleink Exp $ */
! 3:
! 4: /*
! 5: *
! 6: * Copyright (c) 1997 Charles D. Cranor and Washington University.
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This product includes software developed by Charles D. Cranor and
! 20: * Washington University.
! 21: * 4. The name of the author may not be used to endorse or promote products
! 22: * derived from this software without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 34: *
! 35: * from: Id: uvm_vnode.h,v 1.1.2.4 1997/10/03 21:18:24 chuck Exp
! 36: */
! 37:
! 38: #ifndef _UVM_UVM_VNODE_H_
! 39: #define _UVM_UVM_VNODE_H_
! 40:
! 41: /*
! 42: * uvm_vnode.h
! 43: *
! 44: * vnode handle into the VM system.
! 45: */
! 46:
! 47: /*
! 48: * the uvm_vnode structure. put at the top of the vnode data structure.
! 49: * this allows:
! 50: * (struct vnode *) == (struct uvm_vnode *) == (struct uvm_object *)
! 51: */
! 52:
! 53: struct uvm_vnode {
! 54: struct uvm_object u_obj; /* the actual VM object */
! 55: int u_flags; /* flags */
! 56: int u_nio; /* number of running I/O requests */
! 57: voff_t u_size; /* size of object */
! 58:
! 59: /* the following entry is locked by uvn_wl_lock */
! 60: LIST_ENTRY(uvm_vnode) u_wlist; /* list of writeable vnode objects */
! 61:
! 62: /* the following entry is locked by uvn_sync_lock */
! 63: SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* vnode objects due for a "sync" */
! 64: };
! 65:
! 66: /*
! 67: * u_flags values
! 68: */
! 69: #define UVM_VNODE_VALID 0x001 /* we are attached to the vnode */
! 70: #define UVM_VNODE_CANPERSIST 0x002 /* we can persist after ref == 0 */
! 71: #define UVM_VNODE_ALOCK 0x004 /* uvn_attach is locked out */
! 72: #define UVM_VNODE_DYING 0x008 /* final detach/terminate in
! 73: progress */
! 74: #define UVM_VNODE_RELKILL 0x010 /* uvn should be killed by releasepg
! 75: when final i/o is done */
! 76: #define UVM_VNODE_WANTED 0x020 /* someone is waiting for alock,
! 77: dying, or relkill to clear */
! 78: #define UVM_VNODE_VNISLOCKED 0x040 /* underlying vnode struct is locked
! 79: (valid when DYING is true) */
! 80: #define UVM_VNODE_IOSYNC 0x080 /* I/O sync in progress ... setter
! 81: sleeps on &uvn->u_nio */
! 82: #define UVM_VNODE_IOSYNCWANTED 0x100 /* a process is waiting for the
! 83: i/o sync to clear so it can do
! 84: i/o */
! 85: #define UVM_VNODE_WRITEABLE 0x200 /* uvn has pages that are writeable */
! 86:
! 87: /*
! 88: * UVM_VNODE_BLOCKED: any condition that should new processes from
! 89: * touching the vnode [set WANTED and sleep to wait for it to clear]
! 90: */
! 91: #define UVM_VNODE_BLOCKED (UVM_VNODE_ALOCK|UVM_VNODE_DYING|UVM_VNODE_RELKILL)
! 92:
! 93: #ifdef _KERNEL
! 94:
! 95: /*
! 96: * prototypes
! 97: */
! 98:
! 99: #if 0
! 100: /*
! 101: * moved uvn_attach to uvm_extern.h because uvm_vnode.h is needed to
! 102: * include sys/vnode.h, and files that include sys/vnode.h don't know
! 103: * what a vm_prot_t is.
! 104: */
! 105: struct uvm_object *uvn_attach(void *, vm_prot_t);
! 106: #endif
! 107:
! 108: #endif /* _KERNEL */
! 109:
! 110: #endif /* _UVM_UVM_VNODE_H_ */
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