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 /*
  29  * Flushing / invalidation routines
  30  */
  31
  32 #include <sys/types.h>
  33
  34 #include <assert.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <unistd.h>
  39
  40 #include "puffs.h"
  41 #include "puffs_priv.h"
  42
  43 #if 0
  44 int
  45 puffs_inval_namecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie,
  46         const char *name)
  47 {
  48
  49         return EOPNOTSUPP;
  50 }
  51 #endif
  52
  53 static int
  54 doflush(struct puffs_usermount *pu, puffs_cookie_t cookie, int op,
  55         off_t start, off_t end)
  56 {
  57         struct puffs_framebuf *pb;
  58         struct puffs_flush *pf;
  59         size_t winlen;
  60         int rv;
  61
  62         pb = puffs_framebuf_make();
  63         if (pb == NULL)
  64                 return ENOMEM;
  65
  66         winlen = sizeof(struct puffs_flush);
  67         if ((rv = puffs_framebuf_getwindow(pb, 0, (void *)&pf, &winlen)) == -1)
  68                 goto out;
  69         assert(winlen == sizeof(struct puffs_flush));
  70
  71         pf->pf_req.preq_buflen = sizeof(struct puffs_flush);
  72         pf->pf_req.preq_opclass = PUFFSOP_FLUSH;
  73         pf->pf_req.preq_id = puffs__nextreq(pu);
  74
  75         pf->pf_op = op;
  76         pf->pf_cookie = cookie;
  77         pf->pf_start = start;
  78         pf->pf_end = end;
  79
  80         rv = puffs_framev_enqueue_cc(puffs_cc_getcc(pu),
  81             puffs_getselectable(pu), pb, 0);
  82
  83  out:
  84         puffs_framebuf_destroy(pb);
  85         return rv;
  86 }
  87
  88 int
  89 puffs_inval_namecache_dir(struct puffs_usermount *pu, puffs_cookie_t cookie)
  90 {
  91
  92         return doflush(pu, cookie, PUFFS_INVAL_NAMECACHE_DIR, 0, 0);
  93 }
  94
  95 int
  96 puffs_inval_namecache_all(struct puffs_usermount *pu)
  97 {
  98
  99         return doflush(pu, NULL, PUFFS_INVAL_NAMECACHE_ALL, 0, 0);
 100 }
 101
 102 int
 103 puffs_inval_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie)
 104 {
 105
 106         return doflush(pu, cookie, PUFFS_INVAL_PAGECACHE_NODE_RANGE, 0, 0);
 107 }
 108
 109 int
 110 puffs_inval_pagecache_node_range(struct puffs_usermount *pu,
 111         puffs_cookie_t cookie, off_t start, off_t end)
 112 {
 113
 114         return doflush(pu, cookie, PUFFS_INVAL_PAGECACHE_NODE_RANGE, start,end);
 115 }
 116
 117 int
 118 puffs_flush_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie)
 119 {
 120
 121         return doflush(pu, cookie, PUFFS_FLUSH_PAGECACHE_NODE_RANGE, 0, 0);
 122 }
 123
 124 int
 125 puffs_flush_pagecache_node_range(struct puffs_usermount *pu,
 126         puffs_cookie_t cookie, off_t start, off_t end)
 127 {
 128
 129         return doflush(pu, cookie, PUFFS_FLUSH_PAGECACHE_NODE_RANGE, start,end);
 130 }