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