1 /* $NetBSD: v7fs_inode.c,v 1.3 2024/09/25 20:10:36 andvar 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_inode.c,v 1.3 2024/09/25 20:10:36 andvar Exp $");
38 #if defined _KERNEL_OPT
39 #include "opt_v7fs.h"
40 #endif
41
42 #ifdef _KERNEL
43 #include <sys/systm.h>
44 #include <sys/param.h>
45 #else
46 #include <stdio.h>
47 #include <string.h>
48 #include <errno.h>
49 #include <time.h>
50 #endif
51
52 #include "v7fs.h"
53 #include "v7fs_impl.h"
54 #include "v7fs_endian.h"
55 #include "v7fs_inode.h"
56 #include "v7fs_superblock.h"
57
58 #ifdef V7FS_INODE_DEBUG
59 #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
60 #else
61 #define DPRINTF(fmt, args...) ((void)0)
62 #endif
63
64 static void v7fs_inode_setup_disk_image(const struct v7fs_self *,
65 struct v7fs_inode *, struct v7fs_inode_diskimage *);
66 static int v7fs_inode_inquire_disk_location(const struct v7fs_self *,
67 v7fs_ino_t, v7fs_daddr_t *, v7fs_daddr_t *);
68 #ifdef V7FS_INODE_DEBUG
69 static int v7fs_inode_block_sanity(const struct v7fs_superblock *,
70 v7fs_daddr_t);
71
72 static int
v7fs_inode_block_sanity(const struct v7fs_superblock * sb,v7fs_daddr_t blk)73 v7fs_inode_block_sanity(const struct v7fs_superblock *sb, v7fs_daddr_t blk)
74 {
75
76 if ((blk < V7FS_ILIST_SECTOR) || (blk >= sb->datablock_start_sector)) {
77 DPRINTF("invalid inode block#%d (%d-%d)\n", blk,
78 V7FS_ILIST_SECTOR, sb->datablock_start_sector);
79 return ENOSPC;
80 }
81
82 return 0;
83 }
84 #endif /* V7FS_INODE_DEBUG */
85
86 int
v7fs_inode_number_sanity(const struct v7fs_superblock * sb,v7fs_ino_t ino)87 v7fs_inode_number_sanity(const struct v7fs_superblock *sb, v7fs_ino_t ino)
88 {
89
90 if (ino < V7FS_ROOT_INODE || ((size_t)ino >= V7FS_MAX_INODE(sb))) {
91 DPRINTF("invalid inode#%d (%d-%zu)\n", ino,
92 V7FS_ROOT_INODE, V7FS_MAX_INODE(sb));
93 return ENOSPC;
94 }
95
96 return 0;
97 }
98
99 int
v7fs_inode_allocate(struct v7fs_self * fs,v7fs_ino_t * ino)100 v7fs_inode_allocate(struct v7fs_self *fs, v7fs_ino_t *ino)
101 {
102 struct v7fs_superblock *sb = &fs->superblock;
103 v7fs_ino_t inode_number;
104 int error = ENOSPC;
105 *ino = 0;
106
107 SUPERB_LOCK(fs);
108 if (sb->total_freeinode == 0) {
109 DPRINTF("inode exhausted!(1)\n");
110 goto errexit;
111 }
112
113 /* If there is no free inode cache, update it. */
114 if (sb->nfreeinode <= 0 && (error = v7fs_freeinode_update(fs))) {
115 DPRINTF("inode exhausted!(2)\n");
116 goto errexit;
117 }
118 /* Get inode from superblock cache. */
119 KDASSERT(sb->nfreeinode <= V7FS_MAX_FREEINODE);
120 inode_number = sb->freeinode[--sb->nfreeinode];
121 sb->total_freeinode--;
122 sb->modified = 1;
123
124 if ((error = v7fs_inode_number_sanity(sb, inode_number))) {
125 DPRINTF("new inode#%d %d %d\n", inode_number, sb->nfreeinode,
126 sb->total_freeinode);
127 DPRINTF("free inode list corrupt\n");
128 goto errexit;
129 }
130 *ino = inode_number;
131
132 errexit:
133 SUPERB_UNLOCK(fs);
134
135 return error;
136 }
137
138 void
v7fs_inode_deallocate(struct v7fs_self * fs,v7fs_ino_t ino)139 v7fs_inode_deallocate(struct v7fs_self *fs, v7fs_ino_t ino)
140 {
141 struct v7fs_superblock *sb = &fs->superblock;
142 struct v7fs_inode inode;
143
144 memset(&inode, 0, sizeof(inode));
145 inode.inode_number = ino;
146 v7fs_inode_writeback(fs, &inode);
147
148 SUPERB_LOCK(fs);
149 if (sb->nfreeinode < V7FS_MAX_FREEINODE) {
150 /* link to freeinode list. */
151 sb->freeinode[sb->nfreeinode++] = ino;
152 }
153 /* If superblock inode cache is full, this inode charged by
154 v7fs_freeinode_update() later. */
155 sb->total_freeinode++;
156 sb->modified = true;
157 SUPERB_UNLOCK(fs);
158 }
159
160 void
v7fs_inode_setup_memory_image(const struct v7fs_self * fs __unused,struct v7fs_inode * mem,struct v7fs_inode_diskimage * disk)161 v7fs_inode_setup_memory_image(const struct v7fs_self *fs __unused,
162 struct v7fs_inode *mem, struct v7fs_inode_diskimage *disk)
163 {
164 #define conv16(m) (mem->m = V7FS_VAL16(fs, (disk->m)))
165 #define conv32(m) (mem->m = V7FS_VAL32(fs, (disk->m)))
166 uint32_t addr;
167 int i;
168
169 memset(mem, 0, sizeof(*mem));
170 conv16(mode);
171 conv16(nlink);
172 conv16(uid);
173 conv16(gid);
174 conv32(filesize);
175 conv32(atime);
176 conv32(mtime);
177 conv32(ctime);
178
179 for (i = 0; i < V7FS_NADDR; i++) {
180 int j = i * 3; /* 3 byte each. (v7fs_daddr is 24bit) */
181 /* expand to 4byte with endian conversion. */
182 addr = V7FS_VAL24_READ(fs, &disk->addr[j]);
183 mem->addr[i] = addr;
184 }
185 mem->device = 0;
186 if (v7fs_inode_iscdev(mem) || v7fs_inode_isbdev(mem)) {
187 mem->device = mem->addr[0];
188 }
189
190 #undef conv16
191 #undef conv32
192 }
193
194 static void
v7fs_inode_setup_disk_image(const struct v7fs_self * fs __unused,struct v7fs_inode * mem,struct v7fs_inode_diskimage * disk)195 v7fs_inode_setup_disk_image(const struct v7fs_self *fs __unused,
196 struct v7fs_inode *mem, struct v7fs_inode_diskimage *disk)
197 {
198 #define conv16(m) (disk->m = V7FS_VAL16(fs, (mem->m)))
199 #define conv32(m) (disk->m = V7FS_VAL32(fs, (mem->m)))
200
201 conv16(mode);
202 conv16(nlink);
203 conv16(uid);
204 conv16(gid);
205 conv32(filesize);
206 conv32(atime);
207 conv32(mtime);
208 conv32(ctime);
209
210 int i;
211 for (i = 0; i < V7FS_NADDR; i++) {
212 int j = i * 3; /* 3 byte each. */
213 V7FS_VAL24_WRITE(fs, mem->addr[i], disk->addr + j);
214 }
215 #undef conv16
216 #undef conv32
217 }
218
219 /* Load inode from disk. */
220 int
v7fs_inode_load(struct v7fs_self * fs,struct v7fs_inode * p,v7fs_ino_t n)221 v7fs_inode_load(struct v7fs_self *fs, struct v7fs_inode *p, v7fs_ino_t n)
222 {
223 v7fs_daddr_t blk, ofs;
224 struct v7fs_inode_diskimage *di;
225 void *buf;
226
227 if (v7fs_inode_inquire_disk_location(fs, n, &blk, &ofs) != 0)
228 return ENOENT;
229
230 ILIST_LOCK(fs);
231 if (!(buf = scratch_read(fs, blk))) {
232 ILIST_UNLOCK(fs);
233 return EIO;
234 }
235 ILIST_UNLOCK(fs);
236 di = (struct v7fs_inode_diskimage *)buf;
237
238 /* Decode disk address, convert endian. */
239 v7fs_inode_setup_memory_image(fs, p, di + ofs);
240 p->inode_number = n;
241
242 scratch_free(fs, buf);
243
244 return 0;
245 }
246
247 /* Write back inode to disk. */
248 int
v7fs_inode_writeback(struct v7fs_self * fs,struct v7fs_inode * mem)249 v7fs_inode_writeback(struct v7fs_self *fs, struct v7fs_inode *mem)
250 {
251 struct v7fs_inode_diskimage disk;
252 v7fs_ino_t ino = mem->inode_number;
253 v7fs_daddr_t blk;
254 v7fs_daddr_t ofs;
255 void *buf;
256 int error = 0;
257
258 if (v7fs_inode_inquire_disk_location(fs, ino, &blk, &ofs) != 0)
259 return ENOENT;
260
261 v7fs_inode_setup_disk_image(fs, mem, &disk);
262
263 ILIST_LOCK(fs);
264 if (!(buf = scratch_read(fs, blk))) {
265 ILIST_UNLOCK(fs);
266 return EIO;
267 }
268 struct v7fs_inode_diskimage *di = (struct v7fs_inode_diskimage *)buf;
269 di[ofs] = disk; /* structure copy; */
270 if (!fs->io.write(fs->io.cookie, buf, blk))
271 error = EIO;
272 ILIST_UNLOCK(fs);
273
274 scratch_free(fs, buf);
275
276 return error;
277 }
278
279 static int
v7fs_inode_inquire_disk_location(const struct v7fs_self * fs __unused,v7fs_ino_t n,v7fs_daddr_t * block,v7fs_daddr_t * offset)280 v7fs_inode_inquire_disk_location(const struct v7fs_self *fs
281 __unused, v7fs_ino_t n, v7fs_daddr_t *block,
282 v7fs_daddr_t *offset)
283 {
284 v7fs_daddr_t ofs, blk;
285 #ifdef V7FS_INODE_DEBUG
286 v7fs_inode_number_sanity(&fs->superblock, n);
287 #endif
288 ofs = (n - 1/*inode start from 1*/) *
289 sizeof(struct v7fs_inode_diskimage);
290 blk = ofs >> V7FS_BSHIFT;
291
292 *block = blk + V7FS_ILIST_SECTOR;
293 *offset = (ofs - blk * V7FS_BSIZE) /
294 sizeof(struct v7fs_inode_diskimage);
295 #ifdef V7FS_INODE_DEBUG
296 return v7fs_inode_block_sanity(&fs->superblock, *block);
297 #else
298 return 0;
299 #endif
300 }
301
302