FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_vnode.h

     /*      $OpenBSD: uvm_vnode.h,v 1.21 2022/10/20 13:31:52 mpi 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.
     */
    
    struct vnode;
    
    /*
     * the uvm_vnode structure.
     *
     *  Locks used to protect struct members in this file:
     *      I       immutable after creation
     *      K       kernel lock
     *      S       uvn_sync_lock
     *      v       u_obj's vmobjlock
     */
    struct uvm_vnode {
            struct uvm_object u_obj;        /* the actual VM object */
            struct vnode *u_vnode;          /* [I] pointer back to vnode */
            int u_flags;                    /* [v] flags */
            int u_nio;                      /* [v] number of running I/O requests */
            voff_t u_size;                  /* [v] size of object */
    
            LIST_ENTRY(uvm_vnode) u_wlist;  /* [K] list of writeable vnode objs */
    
            SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* [S] vnode objs 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)
    
    #endif /* _UVM_UVM_VNODE_H_ */

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