src/afs/DARWIN/osi_vm.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
  14 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  15 #include "afsincludes.h"        /* Afs-based standard headers */
  16 #include "afs/afs_stats.h"      /* statistics */
  17 #include <sys/ubc.h>
  18
  19 /* Try to discard pages, in order to recycle a vcache entry.
  20  *
  21  * We also make some sanity checks:  ref count, open count, held locks.
  22  *
  23  * We also do some non-VM-related chores, such as releasing the cred pointer
  24  * (for AIX and Solaris) and releasing the gnode (for AIX).
  25  *
  26  * Locking:  afs_xvcache lock is held. It must not be dropped.
  27  *
  28  * OSF/1 Locking:  VN_LOCK has been called.
  29  */
  30 int
  31 osi_VM_FlushVCache(struct vcache *avc)
  32 {
  33     struct vnode *vp = AFSTOV(avc);
  34     kern_return_t kret;
  35     off_t size;
  36
  37     if (!vp)
  38         return 0;
  39     AFS_GUNLOCK();
  40 #if 0
  41     if (!(UBCINFOMISSING(vp) || UBCINFORECLAIMED(vp))) {
  42       size=ubc_getsize(vp);
  43       kret=ubc_invalidate(vp,0,size);
  44     }
  45 #endif
  46     cache_purge(vp);
  47     AFS_GLOCK();
  48
  49     return 0;
  50 }
  51
  52
  53 /* Try to store pages to cache, in order to store a file back to the server.
  54  *
  55  * Locking:  the vcache entry's lock is held.  It will usually be dropped and
  56  * re-obtained.
  57  */
  58 void
  59 osi_VM_StoreAllSegments(struct vcache *avc)
  60 {
  61     struct vnode *vp = AFSTOV(avc);
  62     ReleaseWriteLock(&avc->lock);
  63     AFS_GUNLOCK();
  64 #ifdef AFS_DARWIN80_ENV
  65     ubc_msync_range(vp, 0, ubc_getsize(vp), UBC_SYNC|UBC_PUSHDIRTY);
  66 #else
  67     if (UBCINFOEXISTS(vp)) {
  68         ubc_pushdirty(vp);
  69     }
  70 #endif
  71     AFS_GLOCK();
  72     ObtainWriteLock(&avc->lock, 94);
  73 }
  74
  75 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
  76  * try to free pages, when deleting a file.
  77  *
  78  * Locking:  the vcache entry's lock is held.  It may be dropped and
  79  * re-obtained.
  80  *
  81  * Since we drop and re-obtain the lock, we can't guarantee that there won't
  82  * be some pages around when we return, newly created by concurrent activity.
  83  */
  84 void
  85 osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
  86 {
  87     struct vnode *vp = AFSTOV(avc);
  88     void *object;
  89     kern_return_t kret;
  90     off_t size, lastpg;
  91
  92     ReleaseWriteLock(&avc->lock);
  93     AFS_GUNLOCK();
  94 #ifdef AFS_DARWIN80_ENV
  95     ubc_msync_range(vp, 0, ubc_getsize(vp), UBC_INVALIDATE);
  96 #else
  97     if (UBCINFOEXISTS(vp)) {
  98         size = ubc_getsize(vp);
  99         kret = ubc_invalidate(vp, 0, size);
 100         if (kret != 1)          /* should be KERN_SUCCESS */
 101             printf("TryToSmush: invalidate failed (error = %d)\n", kret);
 102     }
 103 #endif
 104     AFS_GLOCK();
 105     ObtainWriteLock(&avc->lock, 59);
 106 }
 107
 108 /* Purge VM for a file when its callback is revoked.
 109  *
 110  * Locking:  No lock is held, not even the global lock.
 111  */
 112 /* XXX this seems to not be referenced anywhere. *somebody* ought to be calling
 113    this, and also making sure that ubc's idea of the filesize is right more
 114    often */
 115 void
 116 osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
 117 {
 118     struct vnode *vp = AFSTOV(avc);
 119     void *object;
 120     kern_return_t kret;
 121     off_t size;
 122 #ifdef AFS_DARWIN80_ENV
 123     size = ubc_getsize(vp);
 124     ubc_msync_range(vp, 0, size, UBC_INVALIDATE);
 125         /* XXX what about when not CStatd */
 126     if (avc->f.states & CStatd && size != avc->f.m.Length)
 127        ubc_setsize(vp, avc->f.m.Length);
 128 #else
 129     if (UBCINFOEXISTS(vp)) {
 130         size = ubc_getsize(vp);
 131         kret = ubc_invalidate(vp, 0, size);
 132         if (kret != 1)          /* Should be KERN_SUCCESS */
 133             printf("VMFlushPages: invalidate failed (error = %d)\n", kret);
 134         /* XXX what about when not CStatd */
 135         if (avc->f.states & CStatd && size != avc->f.m.Length)
 136           if (UBCISVALID(vp))
 137             ubc_setsize(vp, avc->f.m.Length);
 138     }
 139 #endif
 140 }
 141
 142 /* Purge pages beyond end-of-file, when truncating a file.
 143  *
 144  * Locking:  no lock is held, not even the global lock.
 145  * activeV is raised.  This is supposed to block pageins, but at present
 146  * it only works on Solaris.
 147  */
 148 void
 149 osi_VM_Truncate(struct vcache *avc, int alen, afs_ucred_t *acred)
 150 {
 151     struct vnode *vp = AFSTOV(avc);
 152 #ifdef AFS_DARWIN80_ENV
 153     ubc_setsize(vp, alen);
 154 #else
 155     if (UBCINFOEXISTS(vp) && UBCISVALID(vp)) {
 156         ubc_setsize(vp, alen);
 157     }
 158 #endif
 159 }
 160
 161 void
 162 osi_VM_NukePages(struct vnode *vp, off_t offset, off_t size)
 163 {
 164 #if 0
 165     void *object;
 166     struct vcache *avc = VTOAFS(vp);
 167
 168     offset = trunc_page(offset);
 169     size = round_page(size + 1);
 170     while (size) {
 171         ubc_page_op(vp, (vm_offset_t) offset,
 172                     UPL_POP_SET | UPL_POP_BUSY | UPL_POP_DUMP, 0, 0);
 173         size -= PAGE_SIZE;
 174         offset += PAGE_SIZE;
 175     }
 176 #endif
 177 }
 178
 179 int
 180 osi_VM_Setup(struct vcache *avc, int force)
 181 {
 182     int error;
 183     struct vnode *vp = AFSTOV(avc);
 184
 185 #ifndef AFS_DARWIN80_ENV
 186     if (UBCISVALID(vp) && ((avc->f.states & CStatd) || force)) {
 187         if (!UBCINFOEXISTS(vp)) {
 188             osi_vnhold(avc, 0);
 189             avc->f.states |= CUBCinit;
 190             AFS_GUNLOCK();
 191             if ((error = ubc_info_init(vp))) {
 192                 AFS_GLOCK();
 193                 avc->f.states &= ~CUBCinit;
 194                 AFS_RELE(vp);
 195                 return error;
 196             }
 197             AFS_GLOCK();
 198             avc->f.states &= ~CUBCinit;
 199             AFS_RELE(vp);
 200         }
 201         if (UBCINFOEXISTS(vp) && UBCISVALID(vp)) {
 202             ubc_setsize(vp, avc->f.m.Length);
 203         }
 204     }
 205 #endif
 206     return 0;
 207 }