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 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <err.h> 36 #include <assert.h> 37 38 #include <sys/types.h> 39 40 #include "hammer_disk.h" 41 42 #include "fstyp.h" 43 44 extern int fsvtyp_hammer(const char *blkdevs, char *label, size_t size); 45 extern int fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size); 46 47 static hammer_volume_ondisk_t 48 read_ondisk(FILE *fp) 49 { 50 hammer_volume_ondisk_t ondisk; 51 52 ondisk = read_buf(fp, 0, sizeof(*ondisk)); 53 if (ondisk == NULL) 54 err(1, "failed to read ondisk"); 55 56 return (ondisk); 57 } 58 59 static int 60 test_ondisk(const hammer_volume_ondisk_t ondisk) 61 { 62 static int count = 0; 63 static hammer_uuid_t fsid, fstype; 64 static char label[64]; 65 66 if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME && 67 ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV) 68 return (1); 69 if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) 70 return (2); 71 if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1) 72 return (3); 73 if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES) 74 return (4); 75 76 if (count == 0) { 77 count = ondisk->vol_count; 78 assert(count != 0); 79 memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid)); 80 memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype)); 81 strlcpy(label, ondisk->vol_label, sizeof(label)); 82 } else { 83 if (ondisk->vol_count != count) 84 return (5); 85 if (memcmp(&ondisk->vol_fsid, &fsid, sizeof(fsid))) 86 return (6); 87 if (memcmp(&ondisk->vol_fstype, &fstype, sizeof(fstype))) 88 return (7); 89 if (strcmp(ondisk->vol_label, label)) 90 return (8); 91 } 92 93 return (0); 94 } 95 96 int 97 fstyp_hammer(FILE *fp, char *label, size_t size) 98 { 99 hammer_volume_ondisk_t ondisk; 100 int error = 1; 101 102 ondisk = read_ondisk(fp); 103 if (ondisk->vol_no != HAMMER_ROOT_VOLNO) 104 goto fail; 105 if (ondisk->vol_count != 1) 106 goto fail; 107 if (test_ondisk(ondisk)) 108 goto fail; 109 110 strlcpy(label, ondisk->vol_label, size); 111 error = 0; 112 fail: 113 free(ondisk); 114 return (error); 115 } 116 117 static int 118 test_volume(const char *volpath) 119 { 120 hammer_volume_ondisk_t ondisk; 121 FILE *fp; 122 int volno = -1; 123 124 if ((fp = fopen(volpath, "r")) == NULL) 125 err(1, "failed to open %s", volpath); 126 127 ondisk = read_ondisk(fp); 128 fclose(fp); 129 if (test_ondisk(ondisk)) 130 goto fail; 131 132 volno = ondisk->vol_no; 133 fail: 134 free(ondisk); 135 return (volno); 136 } 137 138 static int 139 __fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial) 140 { 141 hammer_volume_ondisk_t ondisk = NULL; 142 FILE *fp; 143 char *dup, *p, *volpath, x[HAMMER_MAX_VOLUMES]; 144 int i, volno, error = 1; 145 146 if (!blkdevs) 147 goto fail; 148 149 memset(x, 0, sizeof(x)); 150 dup = strdup(blkdevs); 151 p = dup; 152 153 volpath = NULL; 154 volno = -1; 155 while (p) { 156 volpath = p; 157 if ((p = strchr(p, ':')) != NULL) 158 *p++ = '\0'; 159 if ((volno = test_volume(volpath)) == -1) 160 break; 161 assert(volno >= 0); 162 assert(volno < HAMMER_MAX_VOLUMES); 163 x[volno]++; 164 } 165 166 if (!volpath) 167 err(1, "invalid path %s", blkdevs); 168 if ((fp = fopen(volpath, "r")) == NULL) 169 err(1, "failed to open %s", volpath); 170 ondisk = read_ondisk(fp); 171 fclose(fp); 172 173 free(dup); 174 175 if (volno == -1) 176 goto fail; 177 if (partial) 178 goto success; 179 180 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 181 if (x[i] > 1) 182 goto fail; 183 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) 184 if (x[i] == 0) 185 break; 186 if (ondisk->vol_count != i) 187 goto fail; 188 for (; i < HAMMER_MAX_VOLUMES; i++) 189 if (x[i] != 0) 190 goto fail; 191 success: 192 strlcpy(label, ondisk->vol_label, size); 193 error = 0; 194 fail: 195 free(ondisk); 196 return (error); 197 } 198 199 int 200 fsvtyp_hammer(const char *blkdevs, char *label, size_t size) 201 { 202 return (__fsvtyp_hammer(blkdevs, label, size, 0)); 203 } 204 205 int 206 fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size) 207 { 208 return (__fsvtyp_hammer(blkdevs, label, size, 1)); 209 } 210