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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_ */