src/afs/FBSD/osi_misc.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 /*
  11  * osi_misc.c
  12  *
  13  */
  14
  15 #include <afsconfig.h>
  16 #include "afs/param.h"
  17
  18
  19 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  20 #include "afsincludes.h"        /* Afs-based standard headers */
  21 #include <sys/namei.h>
  22
  23 int
  24 osi_lookupname(char *aname, enum uio_seg seg, int followlink,
  25                struct vnode **vpp)
  26 {
  27     struct nameidata n;
  28     int flags, error, glocked;
  29
  30     glocked = ISAFS_GLOCK();
  31     if (glocked)
  32         AFS_GUNLOCK();
  33
  34 #if __FreeBSD_version >= 1000021 /* MPSAFE is gone for good! */
  35     flags = 0;
  36 #else
  37     flags = MPSAFE; /* namei must take Giant if needed */
  38 #endif
  39     if (followlink)
  40         flags |= FOLLOW;
  41     else
  42         flags |= NOFOLLOW;
  43     NDINIT(&n, LOOKUP, flags, seg, aname, curthread);
  44     if ((error = namei(&n)) != 0) {
  45         if (glocked)
  46             AFS_GLOCK();
  47         return error;
  48     }
  49     *vpp = n.ni_vp;
  50     /* XXX should we do this?  Usually NOT (matt) */
  51 #if defined(AFS_FBSD80_ENV)
  52     /*VOP_UNLOCK(n.ni_vp, 0);*/
  53 #else
  54     VOP_UNLOCK(n.ni_vp, 0, curthread);
  55 #endif
  56     NDFREE(&n, NDF_ONLY_PNBUF);
  57     if (glocked)
  58         AFS_GLOCK();
  59     return 0;
  60 }
  61
  62 /*
  63  * Replace all of the bogus special-purpose memory allocators...
  64  */
  65 void *
  66 osi_fbsd_alloc(size_t size, int dropglobal)
  67 {
  68         void *rv;
  69         int glocked;
  70
  71         if (dropglobal) {
  72             glocked = ISAFS_GLOCK();
  73             if (glocked)
  74                 AFS_GUNLOCK();
  75             rv = malloc(size, M_AFS, M_WAITOK);
  76             if (glocked)
  77                 AFS_GLOCK();
  78         } else
  79             rv = malloc(size, M_AFS, M_NOWAIT);
  80
  81         return (rv);
  82 }
  83
  84 void
  85 osi_fbsd_free(void *p)
  86 {
  87        free(p, M_AFS);
  88 }
  89
  90 /**
  91  * check if a vcache is in use
  92  *
  93  * @return status
  94  *  @retcode 0 success
  95  *  @retcode EBUSY vcache is in use by someone else
  96  *  @retcode otherwise other error
  97  *
  98  * @pre  The caller must hold the vnode interlock for the associated vnode
  99  * @post The vnode interlock for the associated vnode will still be held
 100  *       and must be VI_UNLOCK'd by the caller
 101  */
 102 int
 103 osi_fbsd_checkinuse(struct vcache *avc)
 104 {
 105     struct vnode *vp = AFSTOV(avc);
 106
 107     ASSERT_VI_LOCKED(vp, "osi_fbsd_checkinuse");
 108
 109     /* The interlock is needed to check the usecount. */
 110     if (vp->v_usecount > 0) {
 111         return EBUSY;
 112     }
 113
 114     /* XXX
 115      * The value of avc->opens here came to be, at some point,
 116      * typically -1.  This was caused by incorrectly performing afs_close
 117      * processing on vnodes being recycled */
 118     if (avc->opens) {
 119         return EBUSY;
 120     }
 121
 122     /* if a lock is held, give up */
 123     if (CheckLock(&avc->lock)) {
 124         return EBUSY;
 125     }
 126
 127     return 0;
 128 }