lib/libpuffs/flush.c

   1 /*      $NetBSD: flush.c,v 1.16 2008/08/12 19:44:39 pooka Exp $ */
   2
   3 /*
   4  * Copyright (c) 2007  Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #if !defined(lint)
  30 __RCSID("$NetBSD: flush.c,v 1.16 2008/08/12 19:44:39 pooka Exp $");
  31 #endif /* !lint */
  32
  33 /*
  34  * Flushing / invalidation routines
  35  */
  36
  37 #include <sys/types.h>
  38
  39 #include <assert.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <puffs.h>
  43 #include <stdio.h>
  44 #include <unistd.h>
  45
  46 #include "puffs_priv.h"
  47
  48 #if 0
  49 int
  50 puffs_inval_namecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie,
  51         const char *name)
  52 {
  53
  54         return EOPNOTSUPP;
  55 }
  56 #endif
  57
  58 static int
  59 doflush(struct puffs_usermount *pu, puffs_cookie_t cookie, int op,
  60         off_t start, off_t end)
  61 {
  62         struct puffs_framebuf *pb;
  63         struct puffs_flush *pf;
  64         size_t winlen;
  65         int rv;
  66
  67         pb = puffs_framebuf_make();
  68         if (pb == NULL)
  69                 return ENOMEM;
  70
  71         winlen = sizeof(struct puffs_flush);
  72         if ((rv = puffs_framebuf_getwindow(pb, 0, (void *)&pf, &winlen)) == -1)
  73                 goto out;
  74         assert(winlen == sizeof(struct puffs_flush));
  75
  76         pf->pf_req.preq_buflen = sizeof(struct puffs_flush);
  77         pf->pf_req.preq_opclass = PUFFSOP_FLUSH;
  78         pf->pf_req.preq_id = puffs__nextreq(pu);
  79
  80         pf->pf_op = op;
  81         pf->pf_cookie = cookie;
  82         pf->pf_start = start;
  83         pf->pf_end = end;
  84
  85         rv = puffs_framev_enqueue_cc(puffs_cc_getcc(pu),
  86             puffs_getselectable(pu), pb, 0);
  87
  88  out:
  89         puffs_framebuf_destroy(pb);
  90         return rv;
  91 }
  92
  93 int
  94 puffs_inval_namecache_dir(struct puffs_usermount *pu, puffs_cookie_t cookie)
  95 {
  96
  97         return doflush(pu, cookie, PUFFS_INVAL_NAMECACHE_DIR, 0, 0);
  98 }
  99
 100 int
 101 puffs_inval_namecache_all(struct puffs_usermount *pu)
 102 {
 103
 104         return doflush(pu, NULL, PUFFS_INVAL_NAMECACHE_ALL, 0, 0);
 105 }
 106
 107 int
 108 puffs_inval_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie)
 109 {
 110
 111         return doflush(pu, cookie, PUFFS_INVAL_PAGECACHE_NODE_RANGE, 0, 0);
 112 }
 113
 114 int
 115 puffs_inval_pagecache_node_range(struct puffs_usermount *pu,
 116         puffs_cookie_t cookie, off_t start, off_t end)
 117 {
 118
 119         return doflush(pu, cookie, PUFFS_INVAL_PAGECACHE_NODE_RANGE, start,end);
 120 }
 121
 122 int
 123 puffs_flush_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie)
 124 {
 125
 126         return doflush(pu, cookie, PUFFS_FLUSH_PAGECACHE_NODE_RANGE, 0, 0);
 127 }
 128
 129 int
 130 puffs_flush_pagecache_node_range(struct puffs_usermount *pu,
 131         puffs_cookie_t cookie, off_t start, off_t end)
 132 {
 133
 134         return doflush(pu, cookie, PUFFS_FLUSH_PAGECACHE_NODE_RANGE, start,end);
 135 }