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Annotation of sys/uvm/uvm_vnode.h, Revision 1.1.1.1

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_ */