root / qemu-nbd.c @ a61c6782
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1 | cd831bd7 | ths | /*
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2 | 7a5ca864 | bellard | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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3 | 7a5ca864 | bellard | *
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4 | 7a5ca864 | bellard | * Network Block Device
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5 | 7a5ca864 | bellard | *
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6 | 7a5ca864 | bellard | * This program is free software; you can redistribute it and/or modify
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7 | 7a5ca864 | bellard | * it under the terms of the GNU General Public License as published by
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8 | 7a5ca864 | bellard | * the Free Software Foundation; under version 2 of the License.
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9 | 7a5ca864 | bellard | *
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10 | 7a5ca864 | bellard | * This program is distributed in the hope that it will be useful,
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11 | 7a5ca864 | bellard | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | 7a5ca864 | bellard | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | 7a5ca864 | bellard | * GNU General Public License for more details.
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14 | 7a5ca864 | bellard | *
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15 | 7a5ca864 | bellard | * You should have received a copy of the GNU General Public License
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16 | 8167ee88 | Blue Swirl | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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17 | 7a5ca864 | bellard | */
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18 | 7a5ca864 | bellard | |
19 | 5a61cb60 | Stefan Weil | #include "qemu-common.h" |
20 | 7a5ca864 | bellard | #include "block_int.h" |
21 | 7a5ca864 | bellard | #include "nbd.h" |
22 | 7a5ca864 | bellard | |
23 | 7a5ca864 | bellard | #include <stdarg.h> |
24 | 7a5ca864 | bellard | #include <stdio.h> |
25 | 7a5ca864 | bellard | #include <getopt.h> |
26 | 7a5ca864 | bellard | #include <err.h> |
27 | cd831bd7 | ths | #include <sys/types.h> |
28 | 7a5ca864 | bellard | #include <sys/socket.h> |
29 | 7a5ca864 | bellard | #include <netinet/in.h> |
30 | 7a5ca864 | bellard | #include <netinet/tcp.h> |
31 | 7a5ca864 | bellard | #include <arpa/inet.h> |
32 | cd831bd7 | ths | #include <signal.h> |
33 | 2bff4b6f | Blue Swirl | #include <libgen.h> |
34 | a517e88b | Paolo Bonzini | #include <pthread.h> |
35 | cd831bd7 | ths | |
36 | cd831bd7 | ths | #define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
37 | 7a5ca864 | bellard | |
38 | af49bbbe | Paolo Bonzini | static NBDExport *exp;
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39 | b1d8e52e | blueswir1 | static int verbose; |
40 | a517e88b | Paolo Bonzini | static char *device; |
41 | a517e88b | Paolo Bonzini | static char *srcpath; |
42 | a517e88b | Paolo Bonzini | static char *sockpath; |
43 | a61c6782 | Paolo Bonzini | static bool sigterm_reported; |
44 | a61c6782 | Paolo Bonzini | static bool nbd_started; |
45 | a61c6782 | Paolo Bonzini | static int shared = 1; |
46 | a61c6782 | Paolo Bonzini | static int nb_fds; |
47 | 7a5ca864 | bellard | |
48 | 7a5ca864 | bellard | static void usage(const char *name) |
49 | 7a5ca864 | bellard | { |
50 | 7a5ca864 | bellard | printf( |
51 | 7a5ca864 | bellard | "Usage: %s [OPTIONS] FILE\n"
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52 | 7a5ca864 | bellard | "QEMU Disk Network Block Device Server\n"
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53 | 7a5ca864 | bellard | "\n"
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54 | c2e2872b | Laurent Vivier | " -p, --port=PORT port to listen on (default `%d')\n"
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55 | 7a5ca864 | bellard | " -o, --offset=OFFSET offset into the image\n"
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56 | 7a5ca864 | bellard | " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
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57 | cd831bd7 | ths | " -k, --socket=PATH path to the unix socket\n"
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58 | cd831bd7 | ths | " (default '"SOCKET_PATH"')\n" |
59 | 7a5ca864 | bellard | " -r, --read-only export read-only\n"
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60 | 7a5ca864 | bellard | " -P, --partition=NUM only expose partition NUM\n"
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61 | 2f726488 | ths | " -s, --snapshot use snapshot file\n"
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62 | 2f726488 | ths | " -n, --nocache disable host cache\n"
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63 | cd831bd7 | ths | " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
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64 | cd831bd7 | ths | " -d, --disconnect disconnect the specified device\n"
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65 | 3b05a8e9 | ths | " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
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66 | 75818250 | ths | " -t, --persistent don't exit on the last connection\n"
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67 | 7a5ca864 | bellard | " -v, --verbose display extra debugging information\n"
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68 | 7a5ca864 | bellard | " -h, --help display this help and exit\n"
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69 | 7a5ca864 | bellard | " -V, --version output version information and exit\n"
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70 | 7a5ca864 | bellard | "\n"
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71 | 7a5ca864 | bellard | "Report bugs to <anthony@codemonkey.ws>\n"
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72 | c2e2872b | Laurent Vivier | , name, NBD_DEFAULT_PORT, "DEVICE");
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73 | 7a5ca864 | bellard | } |
74 | 7a5ca864 | bellard | |
75 | 7a5ca864 | bellard | static void version(const char *name) |
76 | 7a5ca864 | bellard | { |
77 | 7a5ca864 | bellard | printf( |
78 | 315bc7aa | ths | "%s version 0.0.1\n"
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79 | 7a5ca864 | bellard | "Written by Anthony Liguori.\n"
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80 | 7a5ca864 | bellard | "\n"
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81 | 7a5ca864 | bellard | "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
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82 | 7a5ca864 | bellard | "This is free software; see the source for copying conditions. There is NO\n"
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83 | 7a5ca864 | bellard | "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
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84 | 315bc7aa | ths | , name); |
85 | 7a5ca864 | bellard | } |
86 | 7a5ca864 | bellard | |
87 | 7a5ca864 | bellard | struct partition_record
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88 | 7a5ca864 | bellard | { |
89 | 7a5ca864 | bellard | uint8_t bootable; |
90 | 7a5ca864 | bellard | uint8_t start_head; |
91 | 7a5ca864 | bellard | uint32_t start_cylinder; |
92 | 7a5ca864 | bellard | uint8_t start_sector; |
93 | 7a5ca864 | bellard | uint8_t system; |
94 | 7a5ca864 | bellard | uint8_t end_head; |
95 | 7a5ca864 | bellard | uint8_t end_cylinder; |
96 | 7a5ca864 | bellard | uint8_t end_sector; |
97 | 7a5ca864 | bellard | uint32_t start_sector_abs; |
98 | 7a5ca864 | bellard | uint32_t nb_sectors_abs; |
99 | 7a5ca864 | bellard | }; |
100 | 7a5ca864 | bellard | |
101 | 7a5ca864 | bellard | static void read_partition(uint8_t *p, struct partition_record *r) |
102 | 7a5ca864 | bellard | { |
103 | 7a5ca864 | bellard | r->bootable = p[0];
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104 | 7a5ca864 | bellard | r->start_head = p[1];
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105 | 7a5ca864 | bellard | r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); |
106 | 7a5ca864 | bellard | r->start_sector = p[2] & 0x3f; |
107 | 7a5ca864 | bellard | r->system = p[4];
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108 | 7a5ca864 | bellard | r->end_head = p[5];
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109 | 7a5ca864 | bellard | r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); |
110 | 7a5ca864 | bellard | r->end_sector = p[6] & 0x3f; |
111 | 7a5ca864 | bellard | r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; |
112 | 7a5ca864 | bellard | r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; |
113 | 7a5ca864 | bellard | } |
114 | 7a5ca864 | bellard | |
115 | 7a5ca864 | bellard | static int find_partition(BlockDriverState *bs, int partition, |
116 | 7a5ca864 | bellard | off_t *offset, off_t *size) |
117 | 7a5ca864 | bellard | { |
118 | 7a5ca864 | bellard | struct partition_record mbr[4]; |
119 | 7a5ca864 | bellard | uint8_t data[512];
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120 | 7a5ca864 | bellard | int i;
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121 | 7a5ca864 | bellard | int ext_partnum = 4; |
122 | cb7cf0e3 | Ryota Ozaki | int ret;
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123 | 7a5ca864 | bellard | |
124 | cb7cf0e3 | Ryota Ozaki | if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { |
125 | cb7cf0e3 | Ryota Ozaki | errno = -ret; |
126 | cb7cf0e3 | Ryota Ozaki | err(EXIT_FAILURE, "error while reading");
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127 | cb7cf0e3 | Ryota Ozaki | } |
128 | 7a5ca864 | bellard | |
129 | 7a5ca864 | bellard | if (data[510] != 0x55 || data[511] != 0xaa) { |
130 | 7a5ca864 | bellard | errno = -EINVAL; |
131 | 7a5ca864 | bellard | return -1; |
132 | 7a5ca864 | bellard | } |
133 | 7a5ca864 | bellard | |
134 | 7a5ca864 | bellard | for (i = 0; i < 4; i++) { |
135 | 7a5ca864 | bellard | read_partition(&data[446 + 16 * i], &mbr[i]); |
136 | 7a5ca864 | bellard | |
137 | 7a5ca864 | bellard | if (!mbr[i].nb_sectors_abs)
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138 | 7a5ca864 | bellard | continue;
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139 | 7a5ca864 | bellard | |
140 | 7a5ca864 | bellard | if (mbr[i].system == 0xF || mbr[i].system == 0x5) { |
141 | 7a5ca864 | bellard | struct partition_record ext[4]; |
142 | 7a5ca864 | bellard | uint8_t data1[512];
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143 | 7a5ca864 | bellard | int j;
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144 | 7a5ca864 | bellard | |
145 | cb7cf0e3 | Ryota Ozaki | if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { |
146 | cb7cf0e3 | Ryota Ozaki | errno = -ret; |
147 | cb7cf0e3 | Ryota Ozaki | err(EXIT_FAILURE, "error while reading");
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148 | cb7cf0e3 | Ryota Ozaki | } |
149 | 7a5ca864 | bellard | |
150 | 7a5ca864 | bellard | for (j = 0; j < 4; j++) { |
151 | 7a5ca864 | bellard | read_partition(&data1[446 + 16 * j], &ext[j]); |
152 | 7a5ca864 | bellard | if (!ext[j].nb_sectors_abs)
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153 | 7a5ca864 | bellard | continue;
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154 | 7a5ca864 | bellard | |
155 | 7a5ca864 | bellard | if ((ext_partnum + j + 1) == partition) { |
156 | 7a5ca864 | bellard | *offset = (uint64_t)ext[j].start_sector_abs << 9;
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157 | 7a5ca864 | bellard | *size = (uint64_t)ext[j].nb_sectors_abs << 9;
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158 | 7a5ca864 | bellard | return 0; |
159 | 7a5ca864 | bellard | } |
160 | 7a5ca864 | bellard | } |
161 | 7a5ca864 | bellard | ext_partnum += 4;
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162 | 7a5ca864 | bellard | } else if ((i + 1) == partition) { |
163 | 7a5ca864 | bellard | *offset = (uint64_t)mbr[i].start_sector_abs << 9;
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164 | 7a5ca864 | bellard | *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
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165 | 7a5ca864 | bellard | return 0; |
166 | 7a5ca864 | bellard | } |
167 | 7a5ca864 | bellard | } |
168 | 7a5ca864 | bellard | |
169 | 7a5ca864 | bellard | errno = -ENOENT; |
170 | 7a5ca864 | bellard | return -1; |
171 | 7a5ca864 | bellard | } |
172 | 7a5ca864 | bellard | |
173 | bb345110 | Paolo Bonzini | static void termsig_handler(int signum) |
174 | bb345110 | Paolo Bonzini | { |
175 | a61c6782 | Paolo Bonzini | sigterm_reported = true;
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176 | a61c6782 | Paolo Bonzini | qemu_notify_event(); |
177 | bb345110 | Paolo Bonzini | } |
178 | bb345110 | Paolo Bonzini | |
179 | a517e88b | Paolo Bonzini | static void *show_parts(void *arg) |
180 | cd831bd7 | ths | { |
181 | a517e88b | Paolo Bonzini | int nbd;
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182 | a517e88b | Paolo Bonzini | |
183 | a517e88b | Paolo Bonzini | /* linux just needs an open() to trigger
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184 | a517e88b | Paolo Bonzini | * the partition table update
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185 | a517e88b | Paolo Bonzini | * but remember to load the module with max_part != 0 :
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186 | a517e88b | Paolo Bonzini | * modprobe nbd max_part=63
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187 | a517e88b | Paolo Bonzini | */
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188 | a517e88b | Paolo Bonzini | nbd = open(device, O_RDWR); |
189 | a517e88b | Paolo Bonzini | if (nbd != -1) { |
190 | a517e88b | Paolo Bonzini | close(nbd); |
191 | a517e88b | Paolo Bonzini | } |
192 | a517e88b | Paolo Bonzini | return NULL; |
193 | a517e88b | Paolo Bonzini | } |
194 | cd831bd7 | ths | |
195 | a517e88b | Paolo Bonzini | static void *nbd_client_thread(void *arg) |
196 | a517e88b | Paolo Bonzini | { |
197 | a517e88b | Paolo Bonzini | int fd = *(int *)arg; |
198 | a517e88b | Paolo Bonzini | off_t size; |
199 | a517e88b | Paolo Bonzini | size_t blocksize; |
200 | a517e88b | Paolo Bonzini | uint32_t nbdflags; |
201 | a517e88b | Paolo Bonzini | int sock;
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202 | a517e88b | Paolo Bonzini | int ret;
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203 | a517e88b | Paolo Bonzini | pthread_t show_parts_thread; |
204 | a517e88b | Paolo Bonzini | |
205 | a517e88b | Paolo Bonzini | do {
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206 | a517e88b | Paolo Bonzini | sock = unix_socket_outgoing(sockpath); |
207 | a517e88b | Paolo Bonzini | if (sock == -1) { |
208 | f1ef5555 | Paolo Bonzini | goto out;
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209 | a517e88b | Paolo Bonzini | } |
210 | a517e88b | Paolo Bonzini | } while (sock == -1); |
211 | a517e88b | Paolo Bonzini | |
212 | a517e88b | Paolo Bonzini | ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
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213 | a517e88b | Paolo Bonzini | &size, &blocksize); |
214 | a517e88b | Paolo Bonzini | if (ret == -1) { |
215 | a517e88b | Paolo Bonzini | goto out;
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216 | a517e88b | Paolo Bonzini | } |
217 | a517e88b | Paolo Bonzini | |
218 | a517e88b | Paolo Bonzini | ret = nbd_init(fd, sock, nbdflags, size, blocksize); |
219 | a517e88b | Paolo Bonzini | if (ret == -1) { |
220 | a517e88b | Paolo Bonzini | goto out;
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221 | a517e88b | Paolo Bonzini | } |
222 | a517e88b | Paolo Bonzini | |
223 | a517e88b | Paolo Bonzini | /* update partition table */
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224 | a517e88b | Paolo Bonzini | pthread_create(&show_parts_thread, NULL, show_parts, NULL); |
225 | a517e88b | Paolo Bonzini | |
226 | c1f8fdc3 | Paolo Bonzini | if (verbose) {
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227 | c1f8fdc3 | Paolo Bonzini | fprintf(stderr, "NBD device %s is now connected to %s\n",
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228 | c1f8fdc3 | Paolo Bonzini | device, srcpath); |
229 | c1f8fdc3 | Paolo Bonzini | } else {
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230 | c1f8fdc3 | Paolo Bonzini | /* Close stderr so that the qemu-nbd process exits. */
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231 | c1f8fdc3 | Paolo Bonzini | dup2(STDOUT_FILENO, STDERR_FILENO); |
232 | c1f8fdc3 | Paolo Bonzini | } |
233 | a517e88b | Paolo Bonzini | |
234 | a517e88b | Paolo Bonzini | ret = nbd_client(fd); |
235 | a517e88b | Paolo Bonzini | if (ret) {
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236 | a517e88b | Paolo Bonzini | goto out;
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237 | cd831bd7 | ths | } |
238 | a517e88b | Paolo Bonzini | close(fd); |
239 | a517e88b | Paolo Bonzini | kill(getpid(), SIGTERM); |
240 | a517e88b | Paolo Bonzini | return (void *) EXIT_SUCCESS; |
241 | a517e88b | Paolo Bonzini | |
242 | a517e88b | Paolo Bonzini | out:
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243 | a517e88b | Paolo Bonzini | kill(getpid(), SIGTERM); |
244 | a517e88b | Paolo Bonzini | return (void *) EXIT_FAILURE; |
245 | cd831bd7 | ths | } |
246 | cd831bd7 | ths | |
247 | a61c6782 | Paolo Bonzini | static int nbd_can_accept(void *opaque) |
248 | a61c6782 | Paolo Bonzini | { |
249 | a61c6782 | Paolo Bonzini | return nb_fds < shared;
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250 | a61c6782 | Paolo Bonzini | } |
251 | a61c6782 | Paolo Bonzini | |
252 | a61c6782 | Paolo Bonzini | static void nbd_read(void *opaque) |
253 | a61c6782 | Paolo Bonzini | { |
254 | a61c6782 | Paolo Bonzini | int fd = (uintptr_t) opaque;
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255 | a61c6782 | Paolo Bonzini | |
256 | a61c6782 | Paolo Bonzini | if (nbd_trip(exp, fd) != 0) { |
257 | a61c6782 | Paolo Bonzini | qemu_set_fd_handler2(fd, NULL, NULL, NULL, NULL); |
258 | a61c6782 | Paolo Bonzini | close(fd); |
259 | a61c6782 | Paolo Bonzini | nb_fds--; |
260 | a61c6782 | Paolo Bonzini | } |
261 | a61c6782 | Paolo Bonzini | } |
262 | a61c6782 | Paolo Bonzini | |
263 | a61c6782 | Paolo Bonzini | static void nbd_accept(void *opaque) |
264 | a61c6782 | Paolo Bonzini | { |
265 | a61c6782 | Paolo Bonzini | int server_fd = (uintptr_t) opaque;
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266 | a61c6782 | Paolo Bonzini | struct sockaddr_in addr;
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267 | a61c6782 | Paolo Bonzini | socklen_t addr_len = sizeof(addr);
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268 | a61c6782 | Paolo Bonzini | |
269 | a61c6782 | Paolo Bonzini | int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); |
270 | a61c6782 | Paolo Bonzini | nbd_started = true;
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271 | a61c6782 | Paolo Bonzini | if (fd != -1 && nbd_negotiate(exp, fd) != -1) { |
272 | a61c6782 | Paolo Bonzini | qemu_set_fd_handler2(fd, NULL, nbd_read, NULL, (void *) (intptr_t) fd); |
273 | a61c6782 | Paolo Bonzini | nb_fds++; |
274 | a61c6782 | Paolo Bonzini | } |
275 | a61c6782 | Paolo Bonzini | } |
276 | a61c6782 | Paolo Bonzini | |
277 | 7a5ca864 | bellard | int main(int argc, char **argv) |
278 | 7a5ca864 | bellard | { |
279 | 7a5ca864 | bellard | BlockDriverState *bs; |
280 | 7a5ca864 | bellard | off_t dev_offset = 0;
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281 | b90fb4b8 | Paolo Bonzini | uint32_t nbdflags = 0;
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282 | cd831bd7 | ths | bool disconnect = false; |
283 | 7a5ca864 | bellard | const char *bindto = "0.0.0.0"; |
284 | c2e2872b | Laurent Vivier | int port = NBD_DEFAULT_PORT;
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285 | 7a5ca864 | bellard | off_t fd_size; |
286 | d6aa671f | aliguori | const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; |
287 | 7a5ca864 | bellard | struct option lopt[] = {
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288 | 660f11be | Blue Swirl | { "help", 0, NULL, 'h' }, |
289 | 660f11be | Blue Swirl | { "version", 0, NULL, 'V' }, |
290 | 660f11be | Blue Swirl | { "bind", 1, NULL, 'b' }, |
291 | 660f11be | Blue Swirl | { "port", 1, NULL, 'p' }, |
292 | 660f11be | Blue Swirl | { "socket", 1, NULL, 'k' }, |
293 | 660f11be | Blue Swirl | { "offset", 1, NULL, 'o' }, |
294 | 660f11be | Blue Swirl | { "read-only", 0, NULL, 'r' }, |
295 | 660f11be | Blue Swirl | { "partition", 1, NULL, 'P' }, |
296 | 660f11be | Blue Swirl | { "connect", 1, NULL, 'c' }, |
297 | 660f11be | Blue Swirl | { "disconnect", 0, NULL, 'd' }, |
298 | 660f11be | Blue Swirl | { "snapshot", 0, NULL, 's' }, |
299 | 660f11be | Blue Swirl | { "nocache", 0, NULL, 'n' }, |
300 | 660f11be | Blue Swirl | { "shared", 1, NULL, 'e' }, |
301 | 660f11be | Blue Swirl | { "persistent", 0, NULL, 't' }, |
302 | 660f11be | Blue Swirl | { "verbose", 0, NULL, 'v' }, |
303 | 660f11be | Blue Swirl | { NULL, 0, NULL, 0 } |
304 | 7a5ca864 | bellard | }; |
305 | 7a5ca864 | bellard | int ch;
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306 | 7a5ca864 | bellard | int opt_ind = 0; |
307 | 7a5ca864 | bellard | int li;
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308 | 7a5ca864 | bellard | char *end;
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309 | f5edb014 | Naphtali Sprei | int flags = BDRV_O_RDWR;
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310 | 7a5ca864 | bellard | int partition = -1; |
311 | cd831bd7 | ths | int ret;
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312 | 3b05a8e9 | ths | int fd;
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313 | 75818250 | ths | int persistent = 0; |
314 | a517e88b | Paolo Bonzini | pthread_t client_thread; |
315 | 7a5ca864 | bellard | |
316 | a517e88b | Paolo Bonzini | /* The client thread uses SIGTERM to interrupt the server. A signal
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317 | a517e88b | Paolo Bonzini | * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
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318 | a517e88b | Paolo Bonzini | */
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319 | bb345110 | Paolo Bonzini | struct sigaction sa_sigterm;
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320 | bb345110 | Paolo Bonzini | memset(&sa_sigterm, 0, sizeof(sa_sigterm)); |
321 | bb345110 | Paolo Bonzini | sa_sigterm.sa_handler = termsig_handler; |
322 | bb345110 | Paolo Bonzini | sigaction(SIGTERM, &sa_sigterm, NULL);
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323 | bb345110 | Paolo Bonzini | |
324 | 7a5ca864 | bellard | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
325 | 7a5ca864 | bellard | switch (ch) {
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326 | 7a5ca864 | bellard | case 's': |
327 | 2f726488 | ths | flags |= BDRV_O_SNAPSHOT; |
328 | 2f726488 | ths | break;
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329 | 2f726488 | ths | case 'n': |
330 | a6599793 | Christoph Hellwig | flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
331 | 7a5ca864 | bellard | break;
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332 | 7a5ca864 | bellard | case 'b': |
333 | 7a5ca864 | bellard | bindto = optarg; |
334 | 7a5ca864 | bellard | break;
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335 | 7a5ca864 | bellard | case 'p': |
336 | 7a5ca864 | bellard | li = strtol(optarg, &end, 0);
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337 | 7a5ca864 | bellard | if (*end) {
|
338 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid port `%s'", optarg);
|
339 | 7a5ca864 | bellard | } |
340 | 7a5ca864 | bellard | if (li < 1 || li > 65535) { |
341 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Port out of range `%s'", optarg);
|
342 | 7a5ca864 | bellard | } |
343 | 7a5ca864 | bellard | port = (uint16_t)li; |
344 | 7a5ca864 | bellard | break;
|
345 | 7a5ca864 | bellard | case 'o': |
346 | 7a5ca864 | bellard | dev_offset = strtoll (optarg, &end, 0);
|
347 | 7a5ca864 | bellard | if (*end) {
|
348 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid offset `%s'", optarg);
|
349 | 7a5ca864 | bellard | } |
350 | 7a5ca864 | bellard | if (dev_offset < 0) { |
351 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg);
|
352 | 7a5ca864 | bellard | } |
353 | 7a5ca864 | bellard | break;
|
354 | 7a5ca864 | bellard | case 'r': |
355 | b90fb4b8 | Paolo Bonzini | nbdflags |= NBD_FLAG_READ_ONLY; |
356 | 07108b29 | Naphtali Sprei | flags &= ~BDRV_O_RDWR; |
357 | 7a5ca864 | bellard | break;
|
358 | 7a5ca864 | bellard | case 'P': |
359 | 7a5ca864 | bellard | partition = strtol(optarg, &end, 0);
|
360 | 7a5ca864 | bellard | if (*end)
|
361 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
|
362 | 7a5ca864 | bellard | if (partition < 1 || partition > 8) |
363 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid partition %d", partition);
|
364 | 7a5ca864 | bellard | break;
|
365 | cd831bd7 | ths | case 'k': |
366 | b32f6c28 | Paolo Bonzini | sockpath = optarg; |
367 | b32f6c28 | Paolo Bonzini | if (sockpath[0] != '/') |
368 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "socket path must be absolute\n");
|
369 | cd831bd7 | ths | break;
|
370 | cd831bd7 | ths | case 'd': |
371 | cd831bd7 | ths | disconnect = true;
|
372 | cd831bd7 | ths | break;
|
373 | cd831bd7 | ths | case 'c': |
374 | cd831bd7 | ths | device = optarg; |
375 | cd831bd7 | ths | break;
|
376 | 3b05a8e9 | ths | case 'e': |
377 | 3b05a8e9 | ths | shared = strtol(optarg, &end, 0);
|
378 | 3b05a8e9 | ths | if (*end) {
|
379 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg);
|
380 | 3b05a8e9 | ths | } |
381 | 3b05a8e9 | ths | if (shared < 1) { |
382 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
|
383 | 3b05a8e9 | ths | } |
384 | 3b05a8e9 | ths | break;
|
385 | 75818250 | ths | case 't': |
386 | 75818250 | ths | persistent = 1;
|
387 | 75818250 | ths | break;
|
388 | 7a5ca864 | bellard | case 'v': |
389 | 7a5ca864 | bellard | verbose = 1;
|
390 | 7a5ca864 | bellard | break;
|
391 | 7a5ca864 | bellard | case 'V': |
392 | 7a5ca864 | bellard | version(argv[0]);
|
393 | 7a5ca864 | bellard | exit(0);
|
394 | 7a5ca864 | bellard | break;
|
395 | 7a5ca864 | bellard | case 'h': |
396 | 7a5ca864 | bellard | usage(argv[0]);
|
397 | 7a5ca864 | bellard | exit(0);
|
398 | 7a5ca864 | bellard | break;
|
399 | 7a5ca864 | bellard | case '?': |
400 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Try `%s --help' for more information.",
|
401 | 7a5ca864 | bellard | argv[0]);
|
402 | 7a5ca864 | bellard | } |
403 | 7a5ca864 | bellard | } |
404 | 7a5ca864 | bellard | |
405 | 7a5ca864 | bellard | if ((argc - optind) != 1) { |
406 | b6353bea | Ryota Ozaki | errx(EXIT_FAILURE, "Invalid number of argument.\n"
|
407 | 7a5ca864 | bellard | "Try `%s --help' for more information.",
|
408 | 7a5ca864 | bellard | argv[0]);
|
409 | 7a5ca864 | bellard | } |
410 | 7a5ca864 | bellard | |
411 | cd831bd7 | ths | if (disconnect) {
|
412 | cd831bd7 | ths | fd = open(argv[optind], O_RDWR); |
413 | cd831bd7 | ths | if (fd == -1) |
414 | cb7cf0e3 | Ryota Ozaki | err(EXIT_FAILURE, "Cannot open %s", argv[optind]);
|
415 | cd831bd7 | ths | |
416 | cd831bd7 | ths | nbd_disconnect(fd); |
417 | cd831bd7 | ths | |
418 | cd831bd7 | ths | close(fd); |
419 | cd831bd7 | ths | |
420 | cd831bd7 | ths | printf("%s disconnected\n", argv[optind]);
|
421 | cd831bd7 | ths | |
422 | cd831bd7 | ths | return 0; |
423 | cd831bd7 | ths | } |
424 | cd831bd7 | ths | |
425 | c1f8fdc3 | Paolo Bonzini | if (device && !verbose) {
|
426 | c1f8fdc3 | Paolo Bonzini | int stderr_fd[2]; |
427 | c1f8fdc3 | Paolo Bonzini | pid_t pid; |
428 | c1f8fdc3 | Paolo Bonzini | int ret;
|
429 | c1f8fdc3 | Paolo Bonzini | |
430 | c1f8fdc3 | Paolo Bonzini | if (qemu_pipe(stderr_fd) == -1) { |
431 | c1f8fdc3 | Paolo Bonzini | err(EXIT_FAILURE, "Error setting up communication pipe");
|
432 | c1f8fdc3 | Paolo Bonzini | } |
433 | c1f8fdc3 | Paolo Bonzini | |
434 | c1f8fdc3 | Paolo Bonzini | /* Now daemonize, but keep a communication channel open to
|
435 | c1f8fdc3 | Paolo Bonzini | * print errors and exit with the proper status code.
|
436 | c1f8fdc3 | Paolo Bonzini | */
|
437 | c1f8fdc3 | Paolo Bonzini | pid = fork(); |
438 | c1f8fdc3 | Paolo Bonzini | if (pid == 0) { |
439 | c1f8fdc3 | Paolo Bonzini | close(stderr_fd[0]);
|
440 | c1f8fdc3 | Paolo Bonzini | ret = qemu_daemon(0, 0); |
441 | c1f8fdc3 | Paolo Bonzini | |
442 | c1f8fdc3 | Paolo Bonzini | /* Temporarily redirect stderr to the parent's pipe... */
|
443 | c1f8fdc3 | Paolo Bonzini | dup2(stderr_fd[1], STDERR_FILENO);
|
444 | c1f8fdc3 | Paolo Bonzini | if (ret == -1) { |
445 | c1f8fdc3 | Paolo Bonzini | err(EXIT_FAILURE, "Failed to daemonize");
|
446 | c1f8fdc3 | Paolo Bonzini | } |
447 | c1f8fdc3 | Paolo Bonzini | |
448 | c1f8fdc3 | Paolo Bonzini | /* ... close the descriptor we inherited and go on. */
|
449 | c1f8fdc3 | Paolo Bonzini | close(stderr_fd[1]);
|
450 | c1f8fdc3 | Paolo Bonzini | } else {
|
451 | c1f8fdc3 | Paolo Bonzini | bool errors = false; |
452 | c1f8fdc3 | Paolo Bonzini | char *buf;
|
453 | c1f8fdc3 | Paolo Bonzini | |
454 | c1f8fdc3 | Paolo Bonzini | /* In the parent. Print error messages from the child until
|
455 | c1f8fdc3 | Paolo Bonzini | * it closes the pipe.
|
456 | c1f8fdc3 | Paolo Bonzini | */
|
457 | c1f8fdc3 | Paolo Bonzini | close(stderr_fd[1]);
|
458 | c1f8fdc3 | Paolo Bonzini | buf = g_malloc(1024);
|
459 | c1f8fdc3 | Paolo Bonzini | while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { |
460 | c1f8fdc3 | Paolo Bonzini | errors = true;
|
461 | c1f8fdc3 | Paolo Bonzini | ret = qemu_write_full(STDERR_FILENO, buf, ret); |
462 | c1f8fdc3 | Paolo Bonzini | if (ret == -1) { |
463 | c1f8fdc3 | Paolo Bonzini | exit(EXIT_FAILURE); |
464 | c1f8fdc3 | Paolo Bonzini | } |
465 | c1f8fdc3 | Paolo Bonzini | } |
466 | c1f8fdc3 | Paolo Bonzini | if (ret == -1) { |
467 | c1f8fdc3 | Paolo Bonzini | err(EXIT_FAILURE, "Cannot read from daemon");
|
468 | c1f8fdc3 | Paolo Bonzini | } |
469 | c1f8fdc3 | Paolo Bonzini | |
470 | c1f8fdc3 | Paolo Bonzini | /* Usually the daemon should not print any message.
|
471 | c1f8fdc3 | Paolo Bonzini | * Exit with zero status in that case.
|
472 | c1f8fdc3 | Paolo Bonzini | */
|
473 | c1f8fdc3 | Paolo Bonzini | exit(errors); |
474 | c1f8fdc3 | Paolo Bonzini | } |
475 | c1f8fdc3 | Paolo Bonzini | } |
476 | c1f8fdc3 | Paolo Bonzini | |
477 | cd831bd7 | ths | if (device) {
|
478 | a517e88b | Paolo Bonzini | /* Open before spawning new threads. In the future, we may
|
479 | a517e88b | Paolo Bonzini | * drop privileges after opening.
|
480 | a517e88b | Paolo Bonzini | */
|
481 | a517e88b | Paolo Bonzini | fd = open(device, O_RDWR); |
482 | a517e88b | Paolo Bonzini | if (fd == -1) { |
483 | a517e88b | Paolo Bonzini | err(EXIT_FAILURE, "Failed to open %s", device);
|
484 | cb7cf0e3 | Ryota Ozaki | } |
485 | cb7cf0e3 | Ryota Ozaki | |
486 | b32f6c28 | Paolo Bonzini | if (sockpath == NULL) { |
487 | b32f6c28 | Paolo Bonzini | sockpath = g_malloc(128);
|
488 | b32f6c28 | Paolo Bonzini | snprintf(sockpath, 128, SOCKET_PATH, basename(device));
|
489 | cd831bd7 | ths | } |
490 | cd831bd7 | ths | } |
491 | cd831bd7 | ths | |
492 | 802ddc37 | Paolo Bonzini | bdrv_init(); |
493 | 802ddc37 | Paolo Bonzini | atexit(bdrv_close_all); |
494 | 802ddc37 | Paolo Bonzini | |
495 | 802ddc37 | Paolo Bonzini | bs = bdrv_new("hda");
|
496 | 802ddc37 | Paolo Bonzini | srcpath = argv[optind]; |
497 | 802ddc37 | Paolo Bonzini | if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { |
498 | 802ddc37 | Paolo Bonzini | errno = -ret; |
499 | 802ddc37 | Paolo Bonzini | err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]);
|
500 | 802ddc37 | Paolo Bonzini | } |
501 | 802ddc37 | Paolo Bonzini | |
502 | 802ddc37 | Paolo Bonzini | fd_size = bs->total_sectors * 512;
|
503 | 802ddc37 | Paolo Bonzini | |
504 | 802ddc37 | Paolo Bonzini | if (partition != -1 && |
505 | 802ddc37 | Paolo Bonzini | find_partition(bs, partition, &dev_offset, &fd_size)) { |
506 | 802ddc37 | Paolo Bonzini | err(EXIT_FAILURE, "Could not find partition %d", partition);
|
507 | 802ddc37 | Paolo Bonzini | } |
508 | 802ddc37 | Paolo Bonzini | |
509 | af49bbbe | Paolo Bonzini | exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags); |
510 | 3b05a8e9 | ths | |
511 | b32f6c28 | Paolo Bonzini | if (sockpath) {
|
512 | a61c6782 | Paolo Bonzini | fd = unix_socket_incoming(sockpath); |
513 | cd831bd7 | ths | } else {
|
514 | a61c6782 | Paolo Bonzini | fd = tcp_socket_incoming(bindto, port); |
515 | cd831bd7 | ths | } |
516 | cd831bd7 | ths | |
517 | a61c6782 | Paolo Bonzini | if (fd == -1) { |
518 | 7a5ca864 | bellard | return 1; |
519 | a61c6782 | Paolo Bonzini | } |
520 | f1ef5555 | Paolo Bonzini | |
521 | f1ef5555 | Paolo Bonzini | if (device) {
|
522 | f1ef5555 | Paolo Bonzini | int ret;
|
523 | f1ef5555 | Paolo Bonzini | |
524 | f1ef5555 | Paolo Bonzini | ret = pthread_create(&client_thread, NULL, nbd_client_thread, &fd);
|
525 | f1ef5555 | Paolo Bonzini | if (ret != 0) { |
526 | f1ef5555 | Paolo Bonzini | errx(EXIT_FAILURE, "Failed to create client thread: %s",
|
527 | f1ef5555 | Paolo Bonzini | strerror(ret)); |
528 | f1ef5555 | Paolo Bonzini | } |
529 | f1ef5555 | Paolo Bonzini | } else {
|
530 | f1ef5555 | Paolo Bonzini | /* Shut up GCC warnings. */
|
531 | f1ef5555 | Paolo Bonzini | memset(&client_thread, 0, sizeof(client_thread)); |
532 | f1ef5555 | Paolo Bonzini | } |
533 | f1ef5555 | Paolo Bonzini | |
534 | a61c6782 | Paolo Bonzini | qemu_init_main_loop(); |
535 | a61c6782 | Paolo Bonzini | qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL,
|
536 | a61c6782 | Paolo Bonzini | (void *)(uintptr_t)fd);
|
537 | 7a5ca864 | bellard | |
538 | 3b05a8e9 | ths | do {
|
539 | a61c6782 | Paolo Bonzini | main_loop_wait(false);
|
540 | a61c6782 | Paolo Bonzini | } while (!sigterm_reported && (persistent || !nbd_started || nb_fds > 0)); |
541 | 7a5ca864 | bellard | |
542 | af49bbbe | Paolo Bonzini | nbd_export_close(exp); |
543 | b32f6c28 | Paolo Bonzini | if (sockpath) {
|
544 | b32f6c28 | Paolo Bonzini | unlink(sockpath); |
545 | b32f6c28 | Paolo Bonzini | } |
546 | 7a5ca864 | bellard | |
547 | a517e88b | Paolo Bonzini | if (device) {
|
548 | a517e88b | Paolo Bonzini | void *ret;
|
549 | a517e88b | Paolo Bonzini | pthread_join(client_thread, &ret); |
550 | a517e88b | Paolo Bonzini | exit(ret != NULL);
|
551 | a517e88b | Paolo Bonzini | } else {
|
552 | a517e88b | Paolo Bonzini | exit(EXIT_SUCCESS); |
553 | a517e88b | Paolo Bonzini | } |
554 | 7a5ca864 | bellard | } |