1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2017-2019 The DragonFly Project
5 * Copyright (c) 2017-2019 Tomohiro Kusumi <tkusumi@netbsd.org>
6 * All rights reserved.
7 *
8 * This software was developed by Edward Tomasz Napierala under sponsorship
9 * from the FreeBSD Foundation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <stdbool.h>
37 #include <string.h>
38 #include <err.h>
39 #include <assert.h>
40
41 #include <sys/types.h>
42
43 #include "hammer2_disk.h"
44
45 #include "fstyp.h"
46
47 static hammer2_volume_data_t*
read_voldata(FILE * fp)48 read_voldata(FILE *fp)
49 {
50 hammer2_volume_data_t *voldata;
51
52 voldata = read_buf(fp, 0, sizeof(*voldata));
53 if (voldata == NULL)
54 err(1, "failed to read volume data");
55
56 return (voldata);
57 }
58
59 static int
test_voldata(const hammer2_volume_data_t * voldata)60 test_voldata(const hammer2_volume_data_t *voldata)
61 {
62 if (voldata->magic != HAMMER2_VOLUME_ID_HBO &&
63 voldata->magic != HAMMER2_VOLUME_ID_ABO)
64 return (1);
65
66 return (0);
67 }
68
69 static hammer2_media_data_t*
read_media(FILE * fp,const hammer2_blockref_t * bref,size_t * media_bytes)70 read_media(FILE *fp, const hammer2_blockref_t *bref, size_t *media_bytes)
71 {
72 hammer2_media_data_t *media;
73 hammer2_off_t io_off, io_base;
74 size_t bytes, io_bytes, boff;
75
76 bytes = (bref->data_off & HAMMER2_OFF_MASK_RADIX);
77 if (bytes)
78 bytes = (size_t)1 << bytes;
79 *media_bytes = bytes;
80
81 if (!bytes) {
82 warnx("blockref has no data");
83 return (NULL);
84 }
85
86 io_off = bref->data_off & ~HAMMER2_OFF_MASK_RADIX;
87 io_base = io_off & ~(hammer2_off_t)(HAMMER2_MINIOSIZE - 1);
88 boff = io_off - io_base;
89
90 io_bytes = HAMMER2_MINIOSIZE;
91 while (io_bytes + boff < bytes)
92 io_bytes <<= 1;
93
94 if (io_bytes > sizeof(hammer2_media_data_t)) {
95 warnx("invalid I/O bytes");
96 return (NULL);
97 }
98
99 if (fseek(fp, io_base, SEEK_SET) == -1) {
100 warnx("failed to seek media");
101 return (NULL);
102 }
103 media = read_buf(fp, io_base, io_bytes);
104 if (media == NULL) {
105 warnx("failed to read media");
106 return (NULL);
107 }
108 if (boff)
109 memcpy(media, (char *)media + boff, bytes);
110
111 return (media);
112 }
113
114 static int
find_pfs(FILE * fp,const hammer2_blockref_t * bref,const char * pfs,bool * res)115 find_pfs(FILE *fp, const hammer2_blockref_t *bref, const char *pfs, bool *res)
116 {
117 hammer2_media_data_t *media;
118 hammer2_inode_data_t ipdata;
119 hammer2_blockref_t *bscan;
120 size_t bytes;
121 int i, bcount;
122
123 media = read_media(fp, bref, &bytes);
124 if (media == NULL)
125 return (-1);
126
127 switch (bref->type) {
128 case HAMMER2_BREF_TYPE_INODE:
129 ipdata = media->ipdata;
130 if (ipdata.meta.pfs_type == HAMMER2_PFSTYPE_SUPROOT) {
131 bscan = &ipdata.u.blockset.blockref[0];
132 bcount = HAMMER2_SET_COUNT;
133 } else {
134 bscan = NULL;
135 bcount = 0;
136 if (ipdata.meta.op_flags & HAMMER2_OPFLAG_PFSROOT) {
137 if (memchr(ipdata.filename, 0,
138 sizeof(ipdata.filename))) {
139 if (!strcmp(
140 (const char*)ipdata.filename, pfs))
141 *res = true;
142 } else {
143 if (strlen(pfs) > 0 &&
144 !memcmp(ipdata.filename, pfs,
145 strlen(pfs)))
146 *res = true;
147 }
148 } else
149 assert(0);
150 }
151 break;
152 case HAMMER2_BREF_TYPE_INDIRECT:
153 bscan = &media->npdata[0];
154 bcount = bytes / sizeof(hammer2_blockref_t);
155 break;
156 default:
157 bscan = NULL;
158 bcount = 0;
159 break;
160 }
161
162 for (i = 0; i < bcount; ++i) {
163 if (bscan[i].type != HAMMER2_BREF_TYPE_EMPTY) {
164 if (find_pfs(fp, &bscan[i], pfs, res) == -1) {
165 free(media);
166 return (-1);
167 }
168 }
169 }
170 free(media);
171
172 return (0);
173 }
174
175 static char*
extract_device_name(const char * devpath)176 extract_device_name(const char *devpath)
177 {
178 char *p, *head;
179
180 if (!devpath)
181 return NULL;
182
183 p = strdup(devpath);
184 head = p;
185
186 p = strchr(p, '@');
187 if (p)
188 *p = 0;
189
190 p = strrchr(head, '/');
191 if (p) {
192 p++;
193 if (*p == 0) {
194 free(head);
195 return NULL;
196 }
197 p = strdup(p);
198 free(head);
199 return p;
200 }
201
202 return head;
203 }
204
205 static int
read_label(FILE * fp,char * label,size_t size)206 read_label(FILE *fp, char *label, size_t size)
207 {
208 hammer2_blockref_t broot, best, *bref;
209 hammer2_media_data_t *vols[HAMMER2_NUM_VOLHDRS], *media;
210 size_t bytes;
211 bool res = false;
212 int i, best_i, error = 1;
213 const char *pfs;
214 char *devname;
215
216 best_i = -1;
217 memset(&best, 0, sizeof(best));
218
219 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
220 memset(&broot, 0, sizeof(broot));
221 broot.type = HAMMER2_BREF_TYPE_VOLUME;
222 broot.data_off = (i * HAMMER2_ZONE_BYTES64) | HAMMER2_PBUFRADIX;
223 vols[i] = read_buf(fp, broot.data_off & ~HAMMER2_OFF_MASK_RADIX,
224 sizeof(*vols[i]));
225 if (vols[i] == NULL)
226 errx(1, "failed to read volume header");
227 broot.mirror_tid = vols[i]->voldata.mirror_tid;
228 if (best_i < 0 || best.mirror_tid < broot.mirror_tid) {
229 best_i = i;
230 best = broot;
231 }
232 }
233
234 bref = &vols[best_i]->voldata.sroot_blockset.blockref[0];
235 if (bref->type != HAMMER2_BREF_TYPE_INODE) {
236 warnx("blockref type is not inode");
237 goto fail;
238 }
239
240 media = read_media(fp, bref, &bytes);
241 if (media == NULL) {
242 goto fail;
243 }
244
245 pfs = "";
246 devname = extract_device_name(NULL);
247 assert(!devname); /* Currently always NULL in FreeBSD. */
248
249 /* Add device name to help support multiple autofs -media mounts. */
250 if (find_pfs(fp, bref, pfs, &res) == 0 && res) {
251 if (devname)
252 snprintf(label, size, "%s_%s", pfs, devname);
253 else
254 strlcpy(label, pfs, size);
255 } else {
256 memset(label, 0, size);
257 memcpy(label, media->ipdata.filename,
258 sizeof(media->ipdata.filename));
259 if (devname) {
260 strlcat(label, "_", size);
261 strlcat(label, devname, size);
262 }
263 }
264 if (devname)
265 free(devname);
266 free(media);
267 error = 0;
268 fail:
269 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++)
270 free(vols[i]);
271
272 return (error);
273 }
274
275 int
fstyp_hammer2(FILE * fp,char * label,size_t size)276 fstyp_hammer2(FILE *fp, char *label, size_t size)
277 {
278 hammer2_volume_data_t *voldata;
279 int error = 1;
280
281 voldata = read_voldata(fp);
282 if (test_voldata(voldata))
283 goto fail;
284
285 error = read_label(fp, label, size);
286 fail:
287 free(voldata);
288 return (error);
289 }
290