| 1 | /* |
| 2 | * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@dragonflybsd.org> |
| 6 | * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org> |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 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 |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 19 | * contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific, prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 25 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 26 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 27 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 28 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 29 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 30 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 31 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 32 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | #include "hammer2.h" |
| 37 | |
| 38 | /* |
| 39 | * Obtain a file descriptor that the caller can execute ioctl()'s on. |
| 40 | */ |
| 41 | int |
| 42 | hammer2_ioctl_handle(const char *sel_path) |
| 43 | { |
| 44 | struct hammer2_ioc_version info; |
| 45 | int fd; |
| 46 | |
| 47 | if (sel_path == NULL) |
| 48 | sel_path = "."; |
| 49 | |
| 50 | fd = open(sel_path, O_RDONLY, 0); |
| 51 | if (fd < 0) { |
| 52 | fprintf(stderr, "hammer2: Unable to open %s: %s\n", |
| 53 | sel_path, strerror(errno)); |
| 54 | return(-1); |
| 55 | } |
| 56 | if (ioctl(fd, HAMMER2IOC_VERSION_GET, &info) < 0) { |
| 57 | fprintf(stderr, "hammer2: '%s' is not a hammer2 filesystem\n", |
| 58 | sel_path); |
| 59 | close(fd); |
| 60 | return(-1); |
| 61 | } |
| 62 | return (fd); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Execute the specified function as a detached independent process/daemon, |
| 67 | * unless we are in debug mode. If we are in debug mode the function is |
| 68 | * executed as a pthread in the current process. |
| 69 | */ |
| 70 | void |
| 71 | hammer2_demon(void *(*func)(void *), void *arg) |
| 72 | { |
| 73 | pthread_t thread = NULL; |
| 74 | pid_t pid; |
| 75 | int ttyfd; |
| 76 | |
| 77 | /* |
| 78 | * Do not disconnect in debug mode |
| 79 | */ |
| 80 | if (DebugOpt) { |
| 81 | pthread_create(&thread, NULL, func, arg); |
| 82 | NormalExit = 0; |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * Otherwise disconnect us. Double-fork to get rid of the ppid |
| 88 | * association and disconnect the TTY. |
| 89 | */ |
| 90 | if ((pid = fork()) < 0) { |
| 91 | fprintf(stderr, "hammer2: fork(): %s\n", strerror(errno)); |
| 92 | exit(1); |
| 93 | } |
| 94 | if (pid > 0) { |
| 95 | while (waitpid(pid, NULL, 0) != pid) |
| 96 | ; |
| 97 | return; /* parent returns */ |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * Get rid of the TTY/session before double-forking to finish off |
| 102 | * the ppid. |
| 103 | */ |
| 104 | ttyfd = open("/dev/null", O_RDWR); |
| 105 | if (ttyfd >= 0) { |
| 106 | if (ttyfd != 0) |
| 107 | dup2(ttyfd, 0); |
| 108 | if (ttyfd != 1) |
| 109 | dup2(ttyfd, 1); |
| 110 | if (ttyfd != 2) |
| 111 | dup2(ttyfd, 2); |
| 112 | if (ttyfd > 2) |
| 113 | close(ttyfd); |
| 114 | } |
| 115 | |
| 116 | ttyfd = open("/dev/tty", O_RDWR); |
| 117 | if (ttyfd >= 0) { |
| 118 | ioctl(ttyfd, TIOCNOTTY, 0); |
| 119 | close(ttyfd); |
| 120 | } |
| 121 | setsid(); |
| 122 | |
| 123 | /* |
| 124 | * Second fork to disconnect ppid (the original parent waits for |
| 125 | * us to exit). |
| 126 | */ |
| 127 | if ((pid = fork()) < 0) { |
| 128 | _exit(2); |
| 129 | } |
| 130 | if (pid > 0) |
| 131 | _exit(0); |
| 132 | |
| 133 | /* |
| 134 | * The double child |
| 135 | */ |
| 136 | setsid(); |
| 137 | pthread_create(&thread, NULL, func, arg); |
| 138 | pthread_exit(NULL); |
| 139 | _exit(2); /* NOT REACHED */ |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * This swaps endian for a hammer2_msg_hdr. Note that the extended |
| 144 | * header is not adjusted, just the core header. |
| 145 | */ |
| 146 | void |
| 147 | hammer2_bswap_head(hammer2_msg_hdr_t *head) |
| 148 | { |
| 149 | head->magic = bswap16(head->magic); |
| 150 | head->icrc1 = bswap16(head->icrc1); |
| 151 | head->salt = bswap32(head->salt); |
| 152 | head->source = bswap16(head->source); |
| 153 | head->target = bswap16(head->target); |
| 154 | head->msgid = bswap32(head->msgid); |
| 155 | head->cmd = bswap32(head->cmd); |
| 156 | head->error = bswap16(head->error); |
| 157 | head->resv05 = bswap16(head->resv05); |
| 158 | head->icrc2 = bswap16(head->icrc2); |
| 159 | head->aux_bytes = bswap16(head->aux_bytes); |
| 160 | head->aux_icrc = bswap32(head->aux_icrc); |
| 161 | } |
| 162 | |
| 163 | const char * |
| 164 | hammer2_time64_to_str(uint64_t htime64, char **strp) |
| 165 | { |
| 166 | struct tm *tp; |
| 167 | time_t t; |
| 168 | |
| 169 | if (*strp) { |
| 170 | free(*strp); |
| 171 | *strp = NULL; |
| 172 | } |
| 173 | *strp = malloc(64); |
| 174 | t = htime64 / 1000000; |
| 175 | tp = localtime(&t); |
| 176 | strftime(*strp, 64, "%d-%b-%Y %H:%M:%S", tp); |
| 177 | return (*strp); |
| 178 | } |
| 179 | |
| 180 | const char * |
| 181 | hammer2_uuid_to_str(uuid_t *uuid, char **strp) |
| 182 | { |
| 183 | uint32_t status; |
| 184 | if (*strp) { |
| 185 | free(*strp); |
| 186 | *strp = NULL; |
| 187 | } |
| 188 | uuid_to_string(uuid, strp, &status); |
| 189 | return (*strp); |
| 190 | } |
| 191 | |
| 192 | const char * |
| 193 | hammer2_iptype_to_str(uint8_t type) |
| 194 | { |
| 195 | switch(type) { |
| 196 | case HAMMER2_OBJTYPE_UNKNOWN: |
| 197 | return("UNKNOWN"); |
| 198 | case HAMMER2_OBJTYPE_DIRECTORY: |
| 199 | return("DIR"); |
| 200 | case HAMMER2_OBJTYPE_REGFILE: |
| 201 | return("FILE"); |
| 202 | case HAMMER2_OBJTYPE_FIFO: |
| 203 | return("FIFO"); |
| 204 | case HAMMER2_OBJTYPE_CDEV: |
| 205 | return("CDEV"); |
| 206 | case HAMMER2_OBJTYPE_BDEV: |
| 207 | return("BDEV"); |
| 208 | case HAMMER2_OBJTYPE_SOFTLINK: |
| 209 | return("SOFTLINK"); |
| 210 | case HAMMER2_OBJTYPE_HARDLINK: |
| 211 | return("HARDLINK"); |
| 212 | case HAMMER2_OBJTYPE_SOCKET: |
| 213 | return("SOCKET"); |
| 214 | case HAMMER2_OBJTYPE_WHITEOUT: |
| 215 | return("WHITEOUT"); |
| 216 | default: |
| 217 | return("ILLEGAL"); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | const char * |
| 222 | hammer2_pfstype_to_str(uint8_t type) |
| 223 | { |
| 224 | switch(type) { |
| 225 | case HAMMER2_PFSTYPE_NONE: |
| 226 | return("NONE"); |
| 227 | case HAMMER2_PFSTYPE_ADMIN: |
| 228 | return("ADMIN"); |
| 229 | case HAMMER2_PFSTYPE_CACHE: |
| 230 | return("CACHE"); |
| 231 | case HAMMER2_PFSTYPE_COPY: |
| 232 | return("COPY"); |
| 233 | case HAMMER2_PFSTYPE_SLAVE: |
| 234 | return("SLAVE"); |
| 235 | case HAMMER2_PFSTYPE_SOFT_SLAVE: |
| 236 | return("SOFT_SLAVE"); |
| 237 | case HAMMER2_PFSTYPE_SOFT_MASTER: |
| 238 | return("SOFT_MASTER"); |
| 239 | case HAMMER2_PFSTYPE_MASTER: |
| 240 | return("MASTER"); |
| 241 | default: |
| 242 | return("ILLEGAL"); |
| 243 | } |
| 244 | } |