1 /* $NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by UCHIYAMA Yasushi.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $");
38 #if defined _KERNEL_OPT
39 #include "opt_v7fs.h"
40 #endif
41
42 #ifdef _KERNEL
43 #include <sys/param.h>
44 #else
45 #include <stdio.h>
46 #include <errno.h>
47 #include <stdlib.h>
48 #endif
49
50 #include "v7fs.h"
51 #include "v7fs_impl.h"
52
53 #if defined _KERNEL
54 #define STATIC_BUFFER
55 #endif
56
57 #ifdef V7FS_IO_DEBUG
58 #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
59 #else
60 #define DPRINTF(fmt, args...) ((void)0)
61 #endif
62
63 void *
scratch_read(struct v7fs_self * fs,daddr_t blk)64 scratch_read(struct v7fs_self *fs, daddr_t blk)
65 {
66 #ifdef STATIC_BUFFER
67 int i;
68 MEM_LOCK(fs);
69 for (i = 0; i < V7FS_SELF_NSCRATCH; i++) {
70 if (fs->scratch_free & (1 << i)) {
71 fs->scratch_free &= ~(1 << i);
72 break;
73 }
74 }
75 if (i == V7FS_SELF_NSCRATCH) {
76 DPRINTF("No scratch area. increase V7FS_SELF_NSCRATCH\n");
77 assert(0);
78 MEM_UNLOCK(fs);
79 return NULL;
80 }
81
82 if (!fs->io.read(fs->io.cookie, fs->scratch[i], blk)) {
83 DPRINTF("*** I/O error block %ld\n", (long)blk);
84 fs->scratch_free |= (1 << i);
85 MEM_UNLOCK(fs);
86 return NULL;
87 }
88 MEM_UNLOCK(fs);
89 /* Statistic */
90 int n;
91 if ((n = scratch_remain(fs)) < fs->scratch_remain)
92 fs->scratch_remain = n;
93
94 return fs->scratch[i];
95 #else
96 uint8_t *buf = malloc(V7FS_BSIZE);
97 if (!fs->io.read(fs->io.cookie, buf, blk)) {
98 DPRINTF("*** I/O error block %ld\n",(long)blk);
99 free(buf);
100 return NULL;
101 }
102 return buf;
103 #endif
104 }
105
106 int
scratch_remain(const struct v7fs_self * fs)107 scratch_remain(const struct v7fs_self *fs)
108 {
109 #ifdef STATIC_BUFFER
110 int nfree;
111 int i;
112 MEM_LOCK(fs);
113 for (i = 0, nfree = 0; i < V7FS_SELF_NSCRATCH; i++) {
114 if (fs->scratch_free & (1 << i)) {
115 nfree++;
116 }
117 }
118 MEM_UNLOCK(fs);
119 return nfree;
120 #else
121 return -1;
122 #endif
123 }
124
125 void
scratch_free(struct v7fs_self * fs __unused,void * p)126 scratch_free(struct v7fs_self *fs __unused, void *p)
127 {
128 #ifdef STATIC_BUFFER
129 int i;
130 MEM_LOCK(fs);
131 for (i = 0; i < V7FS_SELF_NSCRATCH; i++)
132 if (fs->scratch[i] == p) {
133 fs->scratch_free |= (1 << i);
134 break;
135 }
136 MEM_UNLOCK(fs);
137 assert(i != V7FS_SELF_NSCRATCH);
138 #else
139 free(p);
140 #endif
141 }
142