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 <assert.h> 33 #include <uuid.h> 34 #include <vfs/hammer/hammer_disk.h> 35 36 #include "fstyp.h" 37 38 static hammer_volume_ondisk_t 39 read_ondisk(FILE *fp) 40 { 41 hammer_volume_ondisk_t ondisk; 42 43 ondisk = read_buf(fp, 0, sizeof(*ondisk)); 44 if (ondisk == NULL) 45 err(1, "failed to read ondisk"); 46 47 return (ondisk); 48 } 49 50 static int 51 test_ondisk(const hammer_volume_ondisk_t ondisk) 52 { 53 static int count = 0; 54 static hammer_uuid_t fsid, fstype; 55 static char label[64]; 56 57 if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME && 58 ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV) 59 return (1); 60 if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) 61 return (2); 62 if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1) 63 return (3); 64 if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES) 65 return (4); 66 67 if (count == 0) { 68 count = ondisk->vol_count; 69 assert(count != 0); 70 memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid)); 71 memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype)); 72 strlcpy(label, ondisk->vol_label, sizeof(label)); 73 } else { 74 if (ondisk->vol_count != count) 75 return (5); 76 if (!uuid_equal(&ondisk->vol_fsid, &fsid, NULL)) 77 return (6); 78 if (!uuid_equal(&ondisk->vol_fstype, &fstype, NULL)) 79 return (7); 80 if (strcmp(ondisk->vol_label, label)) 81 return (8); 82 } 83 84 return (0); 85 } 86 87 static const char* 88 extract_device_name(const char *devpath) 89 { 90 const char *p; 91 92 p = strrchr(devpath, '/'); 93 if (p) { 94 p++; 95 if (*p == 0) 96 p = NULL; 97 } else { 98 p = devpath; 99 } 100 return (p); 101 } 102 103 int 104 fstyp_hammer(FILE *fp, char *label, size_t size, const char *devpath) 105 { 106 hammer_volume_ondisk_t ondisk; 107 int error = 1; 108 #ifdef HAS_DEVPATH 109 const char *p; 110 #endif 111 ondisk = read_ondisk(fp); 112 if (ondisk->vol_no != HAMMER_ROOT_VOLNO) 113 goto fail; 114 if (ondisk->vol_count != 1) 115 goto fail; 116 if (test_ondisk(ondisk)) 117 goto fail; 118 119 /* 120 * fstyp_function in DragonFly takes an additional devpath argument 121 * which doesn't exist in FreeBSD and NetBSD. 122 */ 123 #ifdef HAS_DEVPATH 124 /* Add device name to help support multiple autofs -media mounts. */ 125 p = extract_device_name(devpath); 126 if (p) 127 snprintf(label, size, "%s_%s", ondisk->vol_label, p); 128 else 129 strlcpy(label, ondisk->vol_label, size); 130 #else 131 strlcpy(label, ondisk->vol_label, size); 132 #endif 133 error = 0; 134 fail: 135 free(ondisk); 136 return (error); 137 } 138 139 static int 140 test_volume(const char *volpath) 141 { 142 hammer_volume_ondisk_t ondisk = NULL; 143 FILE *fp; 144 int volno = -1; 145 146 if ((fp = fopen(volpath, "r")) == NULL) 147 goto fail; 148 149 ondisk = read_ondisk(fp); 150 fclose(fp); 151 if (test_ondisk(ondisk)) 152 goto fail; 153 154 volno = ondisk->vol_no; 155 fail: 156 free(ondisk); 157 return (volno); 158 } 159 160 static int 161 __fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial) 162 { 163 hammer_volume_ondisk_t ondisk = NULL; 164 FILE *fp; 165 char *dup = NULL, *p, *volpath, *rootvolpath, x[HAMMER_MAX_VOLUMES]; 166 int i, volno, error = 1; 167 168 if (!blkdevs) 169 goto fail; 170 171 memset(x, 0, sizeof(x)); 172 dup = strdup(blkdevs); 173 p = dup; 174 175 volpath = NULL; 176 rootvolpath = NULL; 177 volno = -1; 178 while (p) { 179 volpath = p; 180 if ((p = strchr(p, ':')) != NULL) 181 *p++ = '\0'; 182 if ((volno = test_volume(volpath)) == -1) 183 break; 184 assert(volno >= 0); 185 assert(volno < HAMMER_MAX_VOLUMES); 186 x[volno]++; 187 if (volno == HAMMER_ROOT_VOLNO) 188 rootvolpath = volpath; 189 } 190 191 /* If no rootvolpath, proceed only if partial mode with volpath. */ 192 if (rootvolpath) 193 volpath = rootvolpath; 194 else if (!partial || !volpath) 195 goto fail; 196 if ((fp = fopen(volpath, "r")) == NULL) 197 goto fail; 198 ondisk = read_ondisk(fp); 199 fclose(fp); 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 free(ondisk); 227 free(dup); 228 return (error); 229 } 230 231 int 232 fsvtyp_hammer(const char *blkdevs, char *label, size_t size) 233 { 234 return (__fsvtyp_hammer(blkdevs, label, size, 0)); 235 } 236 237 int 238 fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size) 239 { 240 return (__fsvtyp_hammer(blkdevs, label, size, 1)); 241 } 242