1 /*- 2 * Copyright (c) 2016-2019 The DragonFly Project 3 * Copyright (c) 2016-2019 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 <string.h> 31 #include <err.h> 32 #include <uuid.h> 33 #include <vfs/hammer/hammer_disk.h> 34 35 #include "fstyp.h" 36 37 static hammer_volume_ondisk_t 38 read_ondisk(FILE *fp) 39 { 40 return (read_buf(fp, 0, sizeof(struct hammer_volume_ondisk))); 41 } 42 43 static int 44 test_ondisk(const hammer_volume_ondisk_t ondisk) 45 { 46 static int count = 0; 47 static hammer_uuid_t fsid, fstype; 48 static char label[64]; 49 50 if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME && 51 ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV) 52 return (1); 53 if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) 54 return (1); 55 if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1) 56 return (1); 57 if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES) 58 return (1); 59 60 if (count == 0) { 61 count = ondisk->vol_count; 62 if (count == 0) 63 return (1); 64 memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid)); 65 memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype)); 66 strlcpy(label, ondisk->vol_label, sizeof(label)); 67 } else { 68 if (ondisk->vol_count != count) 69 return (1); 70 if (!uuid_equal(&ondisk->vol_fsid, &fsid, NULL)) 71 return (1); 72 if (!uuid_equal(&ondisk->vol_fstype, &fstype, NULL)) 73 return (1); 74 if (strcmp(ondisk->vol_label, label)) 75 return (1); 76 } 77 78 return (0); 79 } 80 81 static const char* 82 extract_device_name(const char *devpath) 83 { 84 const char *p; 85 86 p = strrchr(devpath, '/'); 87 if (p) { 88 p++; 89 if (*p == 0) 90 p = NULL; 91 } else { 92 p = devpath; 93 } 94 return (p); 95 } 96 97 int 98 fstyp_hammer(FILE *fp, char *label, size_t size, const char *devpath) 99 { 100 hammer_volume_ondisk_t ondisk; 101 int error = 1; 102 #ifdef HAS_DEVPATH 103 const char *p; 104 #endif 105 ondisk = read_ondisk(fp); 106 if (!ondisk) 107 goto fail; 108 if (ondisk->vol_no != HAMMER_ROOT_VOLNO) 109 goto fail; 110 if (ondisk->vol_count != 1) 111 goto fail; 112 if (test_ondisk(ondisk)) 113 goto fail; 114 115 /* 116 * fstyp_function in DragonFly takes an additional devpath argument 117 * which doesn't exist in FreeBSD and NetBSD. 118 */ 119 #ifdef HAS_DEVPATH 120 /* Add device name to help support multiple autofs -media mounts. */ 121 p = extract_device_name(devpath); 122 if (p) 123 snprintf(label, size, "%s_%s", ondisk->vol_label, p); 124 else 125 strlcpy(label, ondisk->vol_label, size); 126 #else 127 strlcpy(label, ondisk->vol_label, size); 128 #endif 129 error = 0; 130 fail: 131 free(ondisk); 132 return (error); 133 } 134 135 static int 136 test_volume(const char *volpath) 137 { 138 hammer_volume_ondisk_t ondisk = NULL; 139 FILE *fp; 140 int volno = -1; 141 142 if ((fp = fopen(volpath, "r")) == NULL) 143 goto fail; 144 145 ondisk = read_ondisk(fp); 146 if (!ondisk) 147 goto fail; 148 if (test_ondisk(ondisk)) 149 goto fail; 150 151 volno = ondisk->vol_no; 152 fail: 153 if (fp) 154 fclose(fp); 155 free(ondisk); 156 return (volno); 157 } 158 159 static int 160 __fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial) 161 { 162 hammer_volume_ondisk_t ondisk = NULL; 163 FILE *fp = NULL; 164 char *dup = NULL, *p, *volpath, *rootvolpath, x[HAMMER_MAX_VOLUMES]; 165 int i, volno, error = 1; 166 167 if (!blkdevs) 168 goto fail; 169 170 memset(x, 0, sizeof(x)); 171 dup = strdup(blkdevs); 172 p = dup; 173 174 volpath = NULL; 175 rootvolpath = NULL; 176 volno = -1; 177 while (p) { 178 volpath = p; 179 if ((p = strchr(p, ':')) != NULL) 180 *p++ = '\0'; 181 if ((volno = test_volume(volpath)) == -1) 182 break; 183 if (volno < 0 || volno >= HAMMER_MAX_VOLUMES) 184 goto fail; 185 x[volno]++; 186 if (volno == HAMMER_ROOT_VOLNO) 187 rootvolpath = volpath; 188 } 189 190 /* If no rootvolpath, proceed only if partial mode with volpath. */ 191 if (rootvolpath) 192 volpath = rootvolpath; 193 else if (!partial || !volpath) 194 goto fail; 195 if ((fp = fopen(volpath, "r")) == NULL) 196 goto fail; 197 ondisk = read_ondisk(fp); 198 if (!ondisk) 199 goto fail; 200 201 if (volno == -1) 202 goto fail; 203 if (partial) 204 goto success; 205 206 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 207 if (x[i] > 1) 208 goto fail; 209 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 210 if (x[i] == 0) 211 break; 212 if (ondisk->vol_count != i) 213 goto fail; 214 for (; i < HAMMER_MAX_VOLUMES; i++) 215 if (x[i] != 0) 216 goto fail; 217 success: 218 /* Add device name to help support multiple autofs -media mounts. */ 219 p = (char*)extract_device_name(volpath); 220 if (p) 221 snprintf(label, size, "%s_%s", ondisk->vol_label, p); 222 else 223 strlcpy(label, ondisk->vol_label, size); 224 error = 0; 225 fail: 226 if (fp) 227 fclose(fp); 228 free(ondisk); 229 free(dup); 230 return (error); 231 } 232 233 int 234 fsvtyp_hammer(const char *blkdevs, char *label, size_t size) 235 { 236 return (__fsvtyp_hammer(blkdevs, label, size, 0)); 237 } 238 239 int 240 fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size) 241 { 242 return (__fsvtyp_hammer(blkdevs, label, size, 1)); 243 } 244