1 /*- 2 * Copyright (c) 2017-2019 The DragonFly Project 3 * Copyright (c) 2017-2019 Tomohiro Kusumi <tkusumi@netbsd.org> 4 * 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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS 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 21 * OR 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 <stdio.h> 29 #include <stdlib.h> 30 #include <stdbool.h> 31 #include <string.h> 32 #include <err.h> 33 #include <assert.h> 34 #include <vfs/hammer2/hammer2_disk.h> 35 36 #include "fstyp.h" 37 38 static hammer2_volume_data_t* 39 read_voldata(FILE *fp) 40 { 41 hammer2_volume_data_t *voldata; 42 43 voldata = read_buf(fp, 0, sizeof(*voldata)); 44 if (voldata == NULL) 45 err(1, "failed to read volume data"); 46 47 return (voldata); 48 } 49 50 static int 51 test_voldata(const hammer2_volume_data_t *voldata) 52 { 53 if (voldata->magic != HAMMER2_VOLUME_ID_HBO && 54 voldata->magic != HAMMER2_VOLUME_ID_ABO) 55 return (1); 56 57 return (0); 58 } 59 60 static hammer2_media_data_t* 61 read_media(FILE *fp, const hammer2_blockref_t *bref, size_t *media_bytes) 62 { 63 hammer2_media_data_t *media; 64 hammer2_off_t io_off, io_base; 65 size_t bytes, io_bytes, boff; 66 67 bytes = (bref->data_off & HAMMER2_OFF_MASK_RADIX); 68 if (bytes) 69 bytes = (size_t)1 << bytes; 70 *media_bytes = bytes; 71 72 if (!bytes) { 73 warnx("blockref has no data"); 74 return (NULL); 75 } 76 77 io_off = bref->data_off & ~HAMMER2_OFF_MASK_RADIX; 78 io_base = io_off & ~(hammer2_off_t)(HAMMER2_LBUFSIZE - 1); 79 boff = io_off - io_base; 80 81 io_bytes = HAMMER2_LBUFSIZE; 82 while (io_bytes + boff < bytes) 83 io_bytes <<= 1; 84 85 if (io_bytes > sizeof(hammer2_media_data_t)) { 86 warnx("invalid I/O bytes"); 87 return (NULL); 88 } 89 90 if (fseek(fp, io_base, SEEK_SET) == -1) { 91 warnx("failed to seek media"); 92 return (NULL); 93 } 94 media = read_buf(fp, io_base, io_bytes); 95 if (media == NULL) { 96 warnx("failed to read media"); 97 return (NULL); 98 } 99 if (boff) 100 memcpy(media, (char *)media + boff, bytes); 101 102 return (media); 103 } 104 105 static int 106 find_pfs(FILE *fp, const hammer2_blockref_t *bref, const char *pfs, bool *res) 107 { 108 hammer2_media_data_t *media; 109 hammer2_inode_data_t ipdata; 110 hammer2_blockref_t *bscan; 111 size_t bytes; 112 int i, bcount; 113 114 media = read_media(fp, bref, &bytes); 115 if (media == NULL) 116 return (-1); 117 118 switch (bref->type) { 119 case HAMMER2_BREF_TYPE_INODE: 120 ipdata = media->ipdata; 121 if (ipdata.meta.pfs_type == HAMMER2_PFSTYPE_SUPROOT) { 122 bscan = &ipdata.u.blockset.blockref[0]; 123 bcount = HAMMER2_SET_COUNT; 124 } else { 125 bscan = NULL; 126 bcount = 0; 127 if (ipdata.meta.op_flags & HAMMER2_OPFLAG_PFSROOT) { 128 if (memchr(ipdata.filename, 0, 129 sizeof(ipdata.filename))) { 130 if (!strcmp( 131 (const char*)ipdata.filename, pfs)) 132 *res = true; 133 } else { 134 if (strlen(pfs) > 0 && 135 !memcmp(ipdata.filename, pfs, 136 strlen(pfs))) 137 *res = true; 138 } 139 } else 140 assert(0); 141 } 142 break; 143 case HAMMER2_BREF_TYPE_INDIRECT: 144 bscan = &media->npdata[0]; 145 bcount = bytes / sizeof(hammer2_blockref_t); 146 break; 147 default: 148 bscan = NULL; 149 bcount = 0; 150 break; 151 } 152 153 for (i = 0; i < bcount; ++i) { 154 if (bscan[i].type != HAMMER2_BREF_TYPE_EMPTY) { 155 if (find_pfs(fp, &bscan[i], pfs, res) == -1) { 156 free(media); 157 return (-1); 158 } 159 } 160 } 161 free(media); 162 163 return (0); 164 } 165 166 static char* 167 extract_device_name(const char *devpath) 168 { 169 char *p, *head; 170 171 if (!devpath) 172 return NULL; 173 174 p = strdup(devpath); 175 head = p; 176 177 p = strchr(p, '@'); 178 if (p) 179 *p = 0; 180 181 p = strrchr(head, '/'); 182 if (p) { 183 p++; 184 if (*p == 0) { 185 free(head); 186 return NULL; 187 } 188 p = strdup(p); 189 free(head); 190 return p; 191 } 192 193 return head; 194 } 195 196 static int 197 read_label(FILE *fp, char *label, size_t size, const char *devpath) 198 { 199 hammer2_blockref_t broot, best, *bref; 200 hammer2_media_data_t *vols[HAMMER2_NUM_VOLHDRS], *media; 201 size_t bytes; 202 bool res = false; 203 int i, best_i, error = 1; 204 const char *pfs; 205 char *devname; 206 207 best_i = -1; 208 memset(&best, 0, sizeof(best)); 209 210 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 211 memset(&broot, 0, sizeof(broot)); 212 broot.type = HAMMER2_BREF_TYPE_VOLUME; 213 broot.data_off = (i * HAMMER2_ZONE_BYTES64) | HAMMER2_PBUFRADIX; 214 vols[i] = read_buf(fp, broot.data_off & ~HAMMER2_OFF_MASK_RADIX, 215 sizeof(*vols[i])); 216 broot.mirror_tid = vols[i]->voldata.mirror_tid; 217 if (best_i < 0 || best.mirror_tid < broot.mirror_tid) { 218 best_i = i; 219 best = broot; 220 } 221 } 222 223 bref = &vols[best_i]->voldata.sroot_blockset.blockref[0]; 224 if (bref->type != HAMMER2_BREF_TYPE_INODE) { 225 warnx("blockref type is not inode"); 226 goto fail; 227 } 228 229 media = read_media(fp, bref, &bytes); 230 if (media == NULL) { 231 goto fail; 232 } 233 234 /* 235 * fstyp_function in DragonFly takes an additional devpath argument 236 * which doesn't exist in FreeBSD and NetBSD. 237 */ 238 #ifdef HAS_DEVPATH 239 pfs = strchr(devpath, '@'); 240 if (!pfs) { 241 assert(strlen(devpath)); 242 switch (devpath[strlen(devpath) - 1]) { 243 case 'a': 244 pfs = "BOOT"; 245 break; 246 case 'd': 247 pfs = "ROOT"; 248 break; 249 default: 250 pfs = "DATA"; 251 break; 252 } 253 } else 254 pfs++; 255 256 if (strlen(pfs) > HAMMER2_INODE_MAXNAME) { 257 goto fail; 258 } 259 devname = extract_device_name(devpath); 260 #else 261 pfs = ""; 262 devname = extract_device_name(NULL); 263 assert(!devname); 264 #endif 265 266 /* Add device name to help support multiple autofs -media mounts. */ 267 if (find_pfs(fp, bref, pfs, &res) == 0 && res) { 268 if (devname) 269 snprintf(label, size, "%s_%s", pfs, devname); 270 else 271 strlcpy(label, pfs, size); 272 } else { 273 memset(label, 0, size); 274 memcpy(label, media->ipdata.filename, 275 sizeof(media->ipdata.filename)); 276 if (devname) { 277 strlcat(label, "_", size); 278 strlcat(label, devname, size); 279 } 280 } 281 if (devname) 282 free(devname); 283 free(media); 284 error = 0; 285 fail: 286 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) 287 free(vols[i]); 288 289 return (error); 290 } 291 292 int 293 fstyp_hammer2(FILE *fp, char *label, size_t size, const char *devpath) 294 { 295 hammer2_volume_data_t *voldata; 296 int error = 1; 297 298 voldata = read_voldata(fp); 299 if (test_voldata(voldata)) 300 goto fail; 301 302 error = read_label(fp, label, size, devpath); 303 fail: 304 free(voldata); 305 return (error); 306 } 307