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 * This software was developed by Edward Tomasz Napierala under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <err.h> 38 #include <assert.h> 39 40 #include <sys/types.h> 41 42 #include "hammer_disk.h" 43 44 #include "fstyp.h" 45 46 extern int fsvtyp_hammer(const char *blkdevs, char *label, size_t size); 47 extern int fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size); 48 49 static hammer_volume_ondisk_t 50 read_ondisk(FILE *fp) 51 { 52 hammer_volume_ondisk_t ondisk; 53 54 ondisk = read_buf(fp, 0, sizeof(*ondisk)); 55 if (ondisk == NULL) 56 err(1, "failed to read ondisk"); 57 58 return (ondisk); 59 } 60 61 static int 62 test_ondisk(const hammer_volume_ondisk_t ondisk) 63 { 64 static int count = 0; 65 static hammer_uuid_t fsid, fstype; 66 static char label[64]; 67 68 if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME && 69 ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV) 70 return (1); 71 if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) 72 return (2); 73 if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1) 74 return (3); 75 if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES) 76 return (4); 77 78 if (count == 0) { 79 count = ondisk->vol_count; 80 assert(count != 0); 81 memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid)); 82 memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype)); 83 strlcpy(label, ondisk->vol_label, sizeof(label)); 84 } else { 85 if (ondisk->vol_count != count) 86 return (5); 87 if (memcmp(&ondisk->vol_fsid, &fsid, sizeof(fsid))) 88 return (6); 89 if (memcmp(&ondisk->vol_fstype, &fstype, sizeof(fstype))) 90 return (7); 91 if (strcmp(ondisk->vol_label, label)) 92 return (8); 93 } 94 95 return (0); 96 } 97 98 int 99 fstyp_hammer(FILE *fp, char *label, size_t size) 100 { 101 hammer_volume_ondisk_t ondisk; 102 int error = 1; 103 104 ondisk = read_ondisk(fp); 105 if (ondisk->vol_no != HAMMER_ROOT_VOLNO) 106 goto fail; 107 if (ondisk->vol_count != 1) 108 goto fail; 109 if (test_ondisk(ondisk)) 110 goto fail; 111 112 strlcpy(label, ondisk->vol_label, size); 113 error = 0; 114 fail: 115 free(ondisk); 116 return (error); 117 } 118 119 static int 120 test_volume(const char *volpath) 121 { 122 hammer_volume_ondisk_t ondisk; 123 FILE *fp; 124 int volno = -1; 125 126 if ((fp = fopen(volpath, "r")) == NULL) 127 err(1, "failed to open %s", volpath); 128 129 ondisk = read_ondisk(fp); 130 fclose(fp); 131 if (test_ondisk(ondisk)) 132 goto fail; 133 134 volno = ondisk->vol_no; 135 fail: 136 free(ondisk); 137 return (volno); 138 } 139 140 static int 141 __fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial) 142 { 143 hammer_volume_ondisk_t ondisk = NULL; 144 FILE *fp; 145 char *dup, *p, *volpath, x[HAMMER_MAX_VOLUMES]; 146 int i, volno, error = 1; 147 148 if (!blkdevs) 149 goto fail; 150 151 memset(x, 0, sizeof(x)); 152 dup = strdup(blkdevs); 153 p = dup; 154 155 volpath = NULL; 156 volno = -1; 157 while (p) { 158 volpath = p; 159 if ((p = strchr(p, ':')) != NULL) 160 *p++ = '\0'; 161 if ((volno = test_volume(volpath)) == -1) 162 break; 163 assert(volno >= 0); 164 assert(volno < HAMMER_MAX_VOLUMES); 165 x[volno]++; 166 } 167 168 if (!volpath) 169 err(1, "invalid path %s", blkdevs); 170 if ((fp = fopen(volpath, "r")) == NULL) 171 err(1, "failed to open %s", volpath); 172 ondisk = read_ondisk(fp); 173 fclose(fp); 174 175 free(dup); 176 177 if (volno == -1) 178 goto fail; 179 if (partial) 180 goto success; 181 182 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 183 if (x[i] > 1) 184 goto fail; 185 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 186 if (x[i] == 0) 187 break; 188 if (ondisk->vol_count != i) 189 goto fail; 190 for (; i < HAMMER_MAX_VOLUMES; i++) 191 if (x[i] != 0) 192 goto fail; 193 success: 194 strlcpy(label, ondisk->vol_label, size); 195 error = 0; 196 fail: 197 free(ondisk); 198 return (error); 199 } 200 201 int 202 fsvtyp_hammer(const char *blkdevs, char *label, size_t size) 203 { 204 return (__fsvtyp_hammer(blkdevs, label, size, 0)); 205 } 206 207 int 208 fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size) 209 { 210 return (__fsvtyp_hammer(blkdevs, label, size, 1)); 211 } 212