src/afs/SOLARIS/osi_vcache.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #include <afsconfig.h>
  11 #include "afs/param.h"
  12
  13 #include "afs/sysincludes.h"    /*Standard vendor system headers */
  14 #include "afsincludes.h"        /*AFS-based standard headers */
  15
  16 int
  17 osi_TryEvictVCache(struct vcache *avc, int *slept, int defersleep) {
  18     int code;
  19
  20     if (!VREFCOUNT_GT(avc,0)
  21          && avc->opens == 0 && (avc->f.states & CUnlinkedDel) == 0) {
  22         code = afs_FlushVCache(avc, slept);
  23         if (code == 0)
  24             return 1;
  25     }
  26     return 0;
  27 }
  28
  29 struct vcache *
  30 osi_NewVnode(void) {
  31     struct vcache *avc;
  32
  33     avc = afs_osi_Alloc(sizeof(struct vcache));
  34     osi_Assert(avc != NULL);
  35     return avc;
  36 }
  37
  38 void
  39 osi_PrePopulateVCache(struct vcache *avc) {
  40     memset(avc, 0, sizeof(struct vcache));
  41
  42     QInit(&avc->multiPage);
  43
  44     AFS_RWLOCK_INIT(&avc->vlock, "vcache vlock");
  45
  46     rw_init(&avc->rwlock, "vcache rwlock", RW_DEFAULT, NULL);
  47
  48     /* This is required if the kaio (kernel aynchronous io)
  49      ** module is installed. Inside the kernel, the function
  50      ** check_vp( common/os/aio.c) checks to see if the kernel has
  51      ** to provide asynchronous io for this vnode. This
  52      ** function extracts the device number by following the
  53      ** v_data field of the vnode. If we do not set this field
  54      ** then the system panics. The  value of the v_data field
  55      ** is not really important for AFS vnodes because the kernel
  56      ** does not do asynchronous io for regular files. Hence,
  57      ** for the time being, we fill up the v_data field with the
  58      ** vnode pointer itself. */
  59     avc->v.v_data = (char *)avc;
  60 }
  61
  62 void
  63 osi_AttachVnode(struct vcache *avc, int seq) { }
  64
  65 void
  66 osi_PostPopulateVCache(struct vcache *avc) {
  67     AFSTOV(avc)->v_op = afs_ops;
  68     AFSTOV(avc)->v_vfsp = afs_globalVFS;
  69     vSetType(avc, VREG);
  70
  71     /* Normally we do this in osi_vnhold when we notice the ref count went from
  72      * 0 -> 1. But if we just setup or reused a vcache, we set the refcount to
  73      * 1 directly. So, we must explicitly VFS_HOLD here. */
  74     VFS_HOLD(afs_globalVFS);
  75 }