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      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 }
    136