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1 | 75818250 | 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 | 75818250 | ths | */
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18 | 7a5ca864 | bellard | |
19 | 7a5ca864 | bellard | #include "nbd.h" |
20 | ab359cd1 | Markus Armbruster | #include "block.h" |
21 | 7a5ca864 | bellard | |
22 | 262db388 | Paolo Bonzini | #include "qemu-coroutine.h" |
23 | 262db388 | Paolo Bonzini | |
24 | 7a5ca864 | bellard | #include <errno.h> |
25 | 7a5ca864 | bellard | #include <string.h> |
26 | 03ff3ca3 | aliguori | #ifndef _WIN32
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27 | 7a5ca864 | bellard | #include <sys/ioctl.h> |
28 | 03ff3ca3 | aliguori | #endif
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29 | 5dc2eec9 | Andreas Färber | #if defined(__sun__) || defined(__HAIKU__)
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30 | 7e00eb9b | aliguori | #include <sys/ioccom.h> |
31 | 7e00eb9b | aliguori | #endif
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32 | 7a5ca864 | bellard | #include <ctype.h> |
33 | 7a5ca864 | bellard | #include <inttypes.h> |
34 | 75818250 | ths | |
35 | b90fb4b8 | Paolo Bonzini | #ifdef __linux__
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36 | b90fb4b8 | Paolo Bonzini | #include <linux/fs.h> |
37 | b90fb4b8 | Paolo Bonzini | #endif
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38 | b90fb4b8 | Paolo Bonzini | |
39 | 03ff3ca3 | aliguori | #include "qemu_socket.h" |
40 | d9a73806 | Paolo Bonzini | #include "qemu-queue.h" |
41 | 03ff3ca3 | aliguori | |
42 | 03ff3ca3 | aliguori | //#define DEBUG_NBD
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43 | 03ff3ca3 | aliguori | |
44 | 03ff3ca3 | aliguori | #ifdef DEBUG_NBD
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45 | 75818250 | ths | #define TRACE(msg, ...) do { \ |
46 | 03ff3ca3 | aliguori | LOG(msg, ## __VA_ARGS__); \ |
47 | 75818250 | ths | } while(0) |
48 | 03ff3ca3 | aliguori | #else
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49 | 03ff3ca3 | aliguori | #define TRACE(msg, ...) \
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50 | 03ff3ca3 | aliguori | do { } while (0) |
51 | 03ff3ca3 | aliguori | #endif
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52 | 7a5ca864 | bellard | |
53 | 7a5ca864 | bellard | #define LOG(msg, ...) do { \ |
54 | 7a5ca864 | bellard | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
55 | 7a5ca864 | bellard | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
56 | 7a5ca864 | bellard | } while(0) |
57 | 7a5ca864 | bellard | |
58 | 7a5ca864 | bellard | /* This is all part of the "official" NBD API */
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59 | 7a5ca864 | bellard | |
60 | b2e3d87f | Nick Thomas | #define NBD_REPLY_SIZE (4 + 4 + 8) |
61 | 7a5ca864 | bellard | #define NBD_REQUEST_MAGIC 0x25609513 |
62 | 7a5ca864 | bellard | #define NBD_REPLY_MAGIC 0x67446698 |
63 | 7a5ca864 | bellard | |
64 | 7a5ca864 | bellard | #define NBD_SET_SOCK _IO(0xab, 0) |
65 | 7a5ca864 | bellard | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
66 | 7a5ca864 | bellard | #define NBD_SET_SIZE _IO(0xab, 2) |
67 | 7a5ca864 | bellard | #define NBD_DO_IT _IO(0xab, 3) |
68 | 7a5ca864 | bellard | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
69 | 7a5ca864 | bellard | #define NBD_CLEAR_QUE _IO(0xab, 5) |
70 | b2e3d87f | Nick Thomas | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
71 | b2e3d87f | Nick Thomas | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
72 | 7a5ca864 | bellard | #define NBD_DISCONNECT _IO(0xab, 8) |
73 | bbb74edd | Paolo Bonzini | #define NBD_SET_TIMEOUT _IO(0xab, 9) |
74 | bbb74edd | Paolo Bonzini | #define NBD_SET_FLAGS _IO(0xab, 10) |
75 | 7a5ca864 | bellard | |
76 | b2e3d87f | Nick Thomas | #define NBD_OPT_EXPORT_NAME (1 << 0) |
77 | 1d45f8b5 | Laurent Vivier | |
78 | 7a5ca864 | bellard | /* That's all folks */
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79 | 7a5ca864 | bellard | |
80 | 185b4338 | Paolo Bonzini | ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
81 | 7a5ca864 | bellard | { |
82 | 7a5ca864 | bellard | size_t offset = 0;
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83 | 185b4338 | Paolo Bonzini | int err;
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84 | 7a5ca864 | bellard | |
85 | ae255e52 | Paolo Bonzini | if (qemu_in_coroutine()) {
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86 | ae255e52 | Paolo Bonzini | if (do_read) {
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87 | ae255e52 | Paolo Bonzini | return qemu_co_recv(fd, buffer, size);
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88 | ae255e52 | Paolo Bonzini | } else {
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89 | ae255e52 | Paolo Bonzini | return qemu_co_send(fd, buffer, size);
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90 | ae255e52 | Paolo Bonzini | } |
91 | ae255e52 | Paolo Bonzini | } |
92 | ae255e52 | Paolo Bonzini | |
93 | 7a5ca864 | bellard | while (offset < size) {
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94 | 7a5ca864 | bellard | ssize_t len; |
95 | 7a5ca864 | bellard | |
96 | 7a5ca864 | bellard | if (do_read) {
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97 | 00aa0040 | Blue Swirl | len = qemu_recv(fd, buffer + offset, size - offset, 0);
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98 | 7a5ca864 | bellard | } else {
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99 | 03ff3ca3 | aliguori | len = send(fd, buffer + offset, size - offset, 0);
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100 | 7a5ca864 | bellard | } |
101 | 7a5ca864 | bellard | |
102 | fc19f8a0 | Paolo Bonzini | if (len < 0) { |
103 | 185b4338 | Paolo Bonzini | err = socket_error(); |
104 | 03ff3ca3 | aliguori | |
105 | fc19f8a0 | Paolo Bonzini | /* recoverable error */
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106 | 7fe7b68b | Paolo Bonzini | if (err == EINTR || (offset > 0 && err == EAGAIN)) { |
107 | fc19f8a0 | Paolo Bonzini | continue;
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108 | fc19f8a0 | Paolo Bonzini | } |
109 | fc19f8a0 | Paolo Bonzini | |
110 | fc19f8a0 | Paolo Bonzini | /* unrecoverable error */
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111 | 185b4338 | Paolo Bonzini | return -err;
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112 | 7a5ca864 | bellard | } |
113 | 7a5ca864 | bellard | |
114 | 7a5ca864 | bellard | /* eof */
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115 | 7a5ca864 | bellard | if (len == 0) { |
116 | 7a5ca864 | bellard | break;
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117 | 7a5ca864 | bellard | } |
118 | 7a5ca864 | bellard | |
119 | 7a5ca864 | bellard | offset += len; |
120 | 7a5ca864 | bellard | } |
121 | 7a5ca864 | bellard | |
122 | 7a5ca864 | bellard | return offset;
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123 | 7a5ca864 | bellard | } |
124 | 7a5ca864 | bellard | |
125 | 7fe7b68b | Paolo Bonzini | static ssize_t read_sync(int fd, void *buffer, size_t size) |
126 | 7fe7b68b | Paolo Bonzini | { |
127 | 7fe7b68b | Paolo Bonzini | /* Sockets are kept in blocking mode in the negotiation phase. After
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128 | 7fe7b68b | Paolo Bonzini | * that, a non-readable socket simply means that another thread stole
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129 | 7fe7b68b | Paolo Bonzini | * our request/reply. Synchronization is done with recv_coroutine, so
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130 | 7fe7b68b | Paolo Bonzini | * that this is coroutine-safe.
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131 | 7fe7b68b | Paolo Bonzini | */
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132 | 7fe7b68b | Paolo Bonzini | return nbd_wr_sync(fd, buffer, size, true); |
133 | 7fe7b68b | Paolo Bonzini | } |
134 | 7fe7b68b | Paolo Bonzini | |
135 | 7fe7b68b | Paolo Bonzini | static ssize_t write_sync(int fd, void *buffer, size_t size) |
136 | 7fe7b68b | Paolo Bonzini | { |
137 | 7fe7b68b | Paolo Bonzini | int ret;
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138 | 7fe7b68b | Paolo Bonzini | do {
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139 | 7fe7b68b | Paolo Bonzini | /* For writes, we do expect the socket to be writable. */
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140 | 7fe7b68b | Paolo Bonzini | ret = nbd_wr_sync(fd, buffer, size, false);
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141 | 7fe7b68b | Paolo Bonzini | } while (ret == -EAGAIN);
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142 | 7fe7b68b | Paolo Bonzini | return ret;
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143 | 7fe7b68b | Paolo Bonzini | } |
144 | 7fe7b68b | Paolo Bonzini | |
145 | c12504ce | Nick Thomas | static void combine_addr(char *buf, size_t len, const char* address, |
146 | c12504ce | Nick Thomas | uint16_t port) |
147 | 7a5ca864 | bellard | { |
148 | c12504ce | Nick Thomas | /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
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149 | c12504ce | Nick Thomas | if (strstr(address, ":")) { |
150 | c12504ce | Nick Thomas | snprintf(buf, len, "[%s]:%u", address, port);
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151 | c12504ce | Nick Thomas | } else {
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152 | c12504ce | Nick Thomas | snprintf(buf, len, "%s:%u", address, port);
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153 | 7a5ca864 | bellard | } |
154 | 7a5ca864 | bellard | } |
155 | 7a5ca864 | bellard | |
156 | c12504ce | Nick Thomas | int tcp_socket_outgoing(const char *address, uint16_t port) |
157 | 7a5ca864 | bellard | { |
158 | c12504ce | Nick Thomas | char address_and_port[128]; |
159 | c12504ce | Nick Thomas | combine_addr(address_and_port, 128, address, port);
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160 | c12504ce | Nick Thomas | return tcp_socket_outgoing_spec(address_and_port);
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161 | 7a5ca864 | bellard | } |
162 | 7a5ca864 | bellard | |
163 | c12504ce | Nick Thomas | int tcp_socket_outgoing_spec(const char *address_and_port) |
164 | cd831bd7 | ths | { |
165 | a6ba35b3 | Amos Kong | return inet_connect(address_and_port, true, NULL); |
166 | cd831bd7 | ths | } |
167 | cd831bd7 | ths | |
168 | c12504ce | Nick Thomas | int tcp_socket_incoming(const char *address, uint16_t port) |
169 | cd831bd7 | ths | { |
170 | c12504ce | Nick Thomas | char address_and_port[128]; |
171 | c12504ce | Nick Thomas | combine_addr(address_and_port, 128, address, port);
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172 | c12504ce | Nick Thomas | return tcp_socket_incoming_spec(address_and_port);
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173 | c12504ce | Nick Thomas | } |
174 | cd831bd7 | ths | |
175 | c12504ce | Nick Thomas | int tcp_socket_incoming_spec(const char *address_and_port) |
176 | c12504ce | Nick Thomas | { |
177 | c12504ce | Nick Thomas | char *ostr = NULL; |
178 | c12504ce | Nick Thomas | int olen = 0; |
179 | 029409e5 | Amos Kong | return inet_listen(address_and_port, ostr, olen, SOCK_STREAM, 0, NULL); |
180 | 03ff3ca3 | aliguori | } |
181 | c12504ce | Nick Thomas | |
182 | 03ff3ca3 | aliguori | int unix_socket_incoming(const char *path) |
183 | 03ff3ca3 | aliguori | { |
184 | c12504ce | Nick Thomas | char *ostr = NULL; |
185 | c12504ce | Nick Thomas | int olen = 0; |
186 | c12504ce | Nick Thomas | |
187 | c12504ce | Nick Thomas | return unix_listen(path, ostr, olen);
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188 | cd831bd7 | ths | } |
189 | cd831bd7 | ths | |
190 | 03ff3ca3 | aliguori | int unix_socket_outgoing(const char *path) |
191 | 03ff3ca3 | aliguori | { |
192 | c12504ce | Nick Thomas | return unix_connect(path);
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193 | 03ff3ca3 | aliguori | } |
194 | cd831bd7 | ths | |
195 | 7a5ca864 | bellard | /* Basic flow
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196 | 7a5ca864 | bellard | |
197 | 7a5ca864 | bellard | Server Client
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198 | 7a5ca864 | bellard | |
199 | 7a5ca864 | bellard | Negotiate
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200 | 7a5ca864 | bellard | Request
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201 | 7a5ca864 | bellard | Response
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202 | 7a5ca864 | bellard | Request
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203 | 7a5ca864 | bellard | Response
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204 | 7a5ca864 | bellard | ...
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205 | 7a5ca864 | bellard | ...
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206 | 7a5ca864 | bellard | Request (type == 2)
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207 | 7a5ca864 | bellard | */
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208 | 7a5ca864 | bellard | |
209 | af49bbbe | Paolo Bonzini | static int nbd_send_negotiate(int csock, off_t size, uint32_t flags) |
210 | 7a5ca864 | bellard | { |
211 | b2e3d87f | Nick Thomas | char buf[8 + 8 + 8 + 128]; |
212 | 185b4338 | Paolo Bonzini | int rc;
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213 | b2e3d87f | Nick Thomas | |
214 | b2e3d87f | Nick Thomas | /* Negotiate
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215 | b2e3d87f | Nick Thomas | [ 0 .. 7] passwd ("NBDMAGIC")
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216 | b2e3d87f | Nick Thomas | [ 8 .. 15] magic (0x00420281861253)
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217 | b2e3d87f | Nick Thomas | [16 .. 23] size
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218 | b90fb4b8 | Paolo Bonzini | [24 .. 27] flags
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219 | b90fb4b8 | Paolo Bonzini | [28 .. 151] reserved (0)
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220 | b2e3d87f | Nick Thomas | */
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221 | b2e3d87f | Nick Thomas | |
222 | 7fe7b68b | Paolo Bonzini | socket_set_block(csock); |
223 | 185b4338 | Paolo Bonzini | rc = -EINVAL; |
224 | 185b4338 | Paolo Bonzini | |
225 | b2e3d87f | Nick Thomas | TRACE("Beginning negotiation.");
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226 | b2e3d87f | Nick Thomas | memcpy(buf, "NBDMAGIC", 8); |
227 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
228 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 16), size);
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229 | 2c7989a9 | Paolo Bonzini | cpu_to_be32w((uint32_t*)(buf + 24),
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230 | 7a706633 | Paolo Bonzini | flags | NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM | |
231 | 7a706633 | Paolo Bonzini | NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA); |
232 | b90fb4b8 | Paolo Bonzini | memset(buf + 28, 0, 124); |
233 | b2e3d87f | Nick Thomas | |
234 | b2e3d87f | Nick Thomas | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
235 | b2e3d87f | Nick Thomas | LOG("write failed");
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236 | 185b4338 | Paolo Bonzini | goto fail;
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237 | b2e3d87f | Nick Thomas | } |
238 | b2e3d87f | Nick Thomas | |
239 | 07f35073 | Dong Xu Wang | TRACE("Negotiation succeeded.");
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240 | 185b4338 | Paolo Bonzini | rc = 0;
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241 | 185b4338 | Paolo Bonzini | fail:
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242 | 7fe7b68b | Paolo Bonzini | socket_set_nonblock(csock); |
243 | 185b4338 | Paolo Bonzini | return rc;
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244 | 7a5ca864 | bellard | } |
245 | 7a5ca864 | bellard | |
246 | 1d45f8b5 | Laurent Vivier | int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
247 | 1d45f8b5 | Laurent Vivier | off_t *size, size_t *blocksize) |
248 | 7a5ca864 | bellard | { |
249 | b2e3d87f | Nick Thomas | char buf[256]; |
250 | b2e3d87f | Nick Thomas | uint64_t magic, s; |
251 | b2e3d87f | Nick Thomas | uint16_t tmp; |
252 | 185b4338 | Paolo Bonzini | int rc;
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253 | b2e3d87f | Nick Thomas | |
254 | 07f35073 | Dong Xu Wang | TRACE("Receiving negotiation.");
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255 | b2e3d87f | Nick Thomas | |
256 | 7fe7b68b | Paolo Bonzini | socket_set_block(csock); |
257 | 185b4338 | Paolo Bonzini | rc = -EINVAL; |
258 | 185b4338 | Paolo Bonzini | |
259 | b2e3d87f | Nick Thomas | if (read_sync(csock, buf, 8) != 8) { |
260 | b2e3d87f | Nick Thomas | LOG("read failed");
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261 | 185b4338 | Paolo Bonzini | goto fail;
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262 | b2e3d87f | Nick Thomas | } |
263 | b2e3d87f | Nick Thomas | |
264 | b2e3d87f | Nick Thomas | buf[8] = '\0'; |
265 | b2e3d87f | Nick Thomas | if (strlen(buf) == 0) { |
266 | b2e3d87f | Nick Thomas | LOG("server connection closed");
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267 | 185b4338 | Paolo Bonzini | goto fail;
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268 | b2e3d87f | Nick Thomas | } |
269 | b2e3d87f | Nick Thomas | |
270 | b2e3d87f | Nick Thomas | TRACE("Magic is %c%c%c%c%c%c%c%c",
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271 | b2e3d87f | Nick Thomas | qemu_isprint(buf[0]) ? buf[0] : '.', |
272 | b2e3d87f | Nick Thomas | qemu_isprint(buf[1]) ? buf[1] : '.', |
273 | b2e3d87f | Nick Thomas | qemu_isprint(buf[2]) ? buf[2] : '.', |
274 | b2e3d87f | Nick Thomas | qemu_isprint(buf[3]) ? buf[3] : '.', |
275 | b2e3d87f | Nick Thomas | qemu_isprint(buf[4]) ? buf[4] : '.', |
276 | b2e3d87f | Nick Thomas | qemu_isprint(buf[5]) ? buf[5] : '.', |
277 | b2e3d87f | Nick Thomas | qemu_isprint(buf[6]) ? buf[6] : '.', |
278 | b2e3d87f | Nick Thomas | qemu_isprint(buf[7]) ? buf[7] : '.'); |
279 | b2e3d87f | Nick Thomas | |
280 | b2e3d87f | Nick Thomas | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
281 | b2e3d87f | Nick Thomas | LOG("Invalid magic received");
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282 | 185b4338 | Paolo Bonzini | goto fail;
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283 | b2e3d87f | Nick Thomas | } |
284 | b2e3d87f | Nick Thomas | |
285 | b2e3d87f | Nick Thomas | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
286 | b2e3d87f | Nick Thomas | LOG("read failed");
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287 | 185b4338 | Paolo Bonzini | goto fail;
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288 | b2e3d87f | Nick Thomas | } |
289 | b2e3d87f | Nick Thomas | magic = be64_to_cpu(magic); |
290 | b2e3d87f | Nick Thomas | TRACE("Magic is 0x%" PRIx64, magic);
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291 | b2e3d87f | Nick Thomas | |
292 | b2e3d87f | Nick Thomas | if (name) {
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293 | b2e3d87f | Nick Thomas | uint32_t reserved = 0;
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294 | b2e3d87f | Nick Thomas | uint32_t opt; |
295 | b2e3d87f | Nick Thomas | uint32_t namesize; |
296 | b2e3d87f | Nick Thomas | |
297 | b2e3d87f | Nick Thomas | TRACE("Checking magic (opts_magic)");
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298 | b2e3d87f | Nick Thomas | if (magic != 0x49484156454F5054LL) { |
299 | b2e3d87f | Nick Thomas | LOG("Bad magic received");
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300 | 185b4338 | Paolo Bonzini | goto fail;
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301 | b2e3d87f | Nick Thomas | } |
302 | b2e3d87f | Nick Thomas | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
303 | b2e3d87f | Nick Thomas | LOG("flags read failed");
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304 | 185b4338 | Paolo Bonzini | goto fail;
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305 | b2e3d87f | Nick Thomas | } |
306 | b2e3d87f | Nick Thomas | *flags = be16_to_cpu(tmp) << 16;
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307 | b2e3d87f | Nick Thomas | /* reserved for future use */
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308 | b2e3d87f | Nick Thomas | if (write_sync(csock, &reserved, sizeof(reserved)) != |
309 | b2e3d87f | Nick Thomas | sizeof(reserved)) {
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310 | b2e3d87f | Nick Thomas | LOG("write failed (reserved)");
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311 | 185b4338 | Paolo Bonzini | goto fail;
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312 | b2e3d87f | Nick Thomas | } |
313 | b2e3d87f | Nick Thomas | /* write the export name */
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314 | b2e3d87f | Nick Thomas | magic = cpu_to_be64(magic); |
315 | b2e3d87f | Nick Thomas | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
316 | b2e3d87f | Nick Thomas | LOG("write failed (magic)");
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317 | 185b4338 | Paolo Bonzini | goto fail;
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318 | b2e3d87f | Nick Thomas | } |
319 | b2e3d87f | Nick Thomas | opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); |
320 | b2e3d87f | Nick Thomas | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
321 | b2e3d87f | Nick Thomas | LOG("write failed (opt)");
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322 | 185b4338 | Paolo Bonzini | goto fail;
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323 | b2e3d87f | Nick Thomas | } |
324 | b2e3d87f | Nick Thomas | namesize = cpu_to_be32(strlen(name)); |
325 | b2e3d87f | Nick Thomas | if (write_sync(csock, &namesize, sizeof(namesize)) != |
326 | b2e3d87f | Nick Thomas | sizeof(namesize)) {
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327 | b2e3d87f | Nick Thomas | LOG("write failed (namesize)");
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328 | 185b4338 | Paolo Bonzini | goto fail;
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329 | b2e3d87f | Nick Thomas | } |
330 | b2e3d87f | Nick Thomas | if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { |
331 | b2e3d87f | Nick Thomas | LOG("write failed (name)");
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332 | 185b4338 | Paolo Bonzini | goto fail;
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333 | b2e3d87f | Nick Thomas | } |
334 | b2e3d87f | Nick Thomas | } else {
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335 | b2e3d87f | Nick Thomas | TRACE("Checking magic (cli_magic)");
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336 | b2e3d87f | Nick Thomas | |
337 | b2e3d87f | Nick Thomas | if (magic != 0x00420281861253LL) { |
338 | b2e3d87f | Nick Thomas | LOG("Bad magic received");
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339 | 185b4338 | Paolo Bonzini | goto fail;
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340 | b2e3d87f | Nick Thomas | } |
341 | b2e3d87f | Nick Thomas | } |
342 | b2e3d87f | Nick Thomas | |
343 | b2e3d87f | Nick Thomas | if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { |
344 | b2e3d87f | Nick Thomas | LOG("read failed");
|
345 | 185b4338 | Paolo Bonzini | goto fail;
|
346 | b2e3d87f | Nick Thomas | } |
347 | b2e3d87f | Nick Thomas | *size = be64_to_cpu(s); |
348 | b2e3d87f | Nick Thomas | *blocksize = 1024;
|
349 | b2e3d87f | Nick Thomas | TRACE("Size is %" PRIu64, *size);
|
350 | b2e3d87f | Nick Thomas | |
351 | b2e3d87f | Nick Thomas | if (!name) {
|
352 | b2e3d87f | Nick Thomas | if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { |
353 | b2e3d87f | Nick Thomas | LOG("read failed (flags)");
|
354 | 185b4338 | Paolo Bonzini | goto fail;
|
355 | b2e3d87f | Nick Thomas | } |
356 | b2e3d87f | Nick Thomas | *flags = be32_to_cpup(flags); |
357 | b2e3d87f | Nick Thomas | } else {
|
358 | b2e3d87f | Nick Thomas | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
359 | b2e3d87f | Nick Thomas | LOG("read failed (tmp)");
|
360 | 185b4338 | Paolo Bonzini | goto fail;
|
361 | b2e3d87f | Nick Thomas | } |
362 | b2e3d87f | Nick Thomas | *flags |= be32_to_cpu(tmp); |
363 | b2e3d87f | Nick Thomas | } |
364 | b2e3d87f | Nick Thomas | if (read_sync(csock, &buf, 124) != 124) { |
365 | b2e3d87f | Nick Thomas | LOG("read failed (buf)");
|
366 | 185b4338 | Paolo Bonzini | goto fail;
|
367 | b2e3d87f | Nick Thomas | } |
368 | 185b4338 | Paolo Bonzini | rc = 0;
|
369 | 185b4338 | Paolo Bonzini | |
370 | 185b4338 | Paolo Bonzini | fail:
|
371 | 7fe7b68b | Paolo Bonzini | socket_set_nonblock(csock); |
372 | 185b4338 | Paolo Bonzini | return rc;
|
373 | cd831bd7 | ths | } |
374 | 7a5ca864 | bellard | |
375 | b90fb4b8 | Paolo Bonzini | #ifdef __linux__
|
376 | b90fb4b8 | Paolo Bonzini | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
377 | cd831bd7 | ths | { |
378 | 3e05c785 | Chunyan Liu | TRACE("Setting NBD socket");
|
379 | 3e05c785 | Chunyan Liu | |
380 | fc19f8a0 | Paolo Bonzini | if (ioctl(fd, NBD_SET_SOCK, csock) < 0) { |
381 | 3e05c785 | Chunyan Liu | int serrno = errno;
|
382 | 3e05c785 | Chunyan Liu | LOG("Failed to set NBD socket");
|
383 | 185b4338 | Paolo Bonzini | return -serrno;
|
384 | 3e05c785 | Chunyan Liu | } |
385 | 3e05c785 | Chunyan Liu | |
386 | b2e3d87f | Nick Thomas | TRACE("Setting block size to %lu", (unsigned long)blocksize); |
387 | 7a5ca864 | bellard | |
388 | fc19f8a0 | Paolo Bonzini | if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) < 0) { |
389 | b2e3d87f | Nick Thomas | int serrno = errno;
|
390 | b2e3d87f | Nick Thomas | LOG("Failed setting NBD block size");
|
391 | 185b4338 | Paolo Bonzini | return -serrno;
|
392 | b2e3d87f | Nick Thomas | } |
393 | 7a5ca864 | bellard | |
394 | 0bfcd599 | Blue Swirl | TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize));
|
395 | 7a5ca864 | bellard | |
396 | fc19f8a0 | Paolo Bonzini | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) < 0) { |
397 | b2e3d87f | Nick Thomas | int serrno = errno;
|
398 | b2e3d87f | Nick Thomas | LOG("Failed setting size (in blocks)");
|
399 | 185b4338 | Paolo Bonzini | return -serrno;
|
400 | b2e3d87f | Nick Thomas | } |
401 | 7a5ca864 | bellard | |
402 | b90fb4b8 | Paolo Bonzini | if (flags & NBD_FLAG_READ_ONLY) {
|
403 | b90fb4b8 | Paolo Bonzini | int read_only = 1; |
404 | b90fb4b8 | Paolo Bonzini | TRACE("Setting readonly attribute");
|
405 | b90fb4b8 | Paolo Bonzini | |
406 | b90fb4b8 | Paolo Bonzini | if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) { |
407 | b90fb4b8 | Paolo Bonzini | int serrno = errno;
|
408 | b90fb4b8 | Paolo Bonzini | LOG("Failed setting read-only attribute");
|
409 | 185b4338 | Paolo Bonzini | return -serrno;
|
410 | b90fb4b8 | Paolo Bonzini | } |
411 | b90fb4b8 | Paolo Bonzini | } |
412 | b90fb4b8 | Paolo Bonzini | |
413 | 973b3d0a | Paolo Bonzini | if (ioctl(fd, NBD_SET_FLAGS, flags) < 0 |
414 | 973b3d0a | Paolo Bonzini | && errno != ENOTTY) { |
415 | 973b3d0a | Paolo Bonzini | int serrno = errno;
|
416 | 973b3d0a | Paolo Bonzini | LOG("Failed setting flags");
|
417 | 185b4338 | Paolo Bonzini | return -serrno;
|
418 | 973b3d0a | Paolo Bonzini | } |
419 | 973b3d0a | Paolo Bonzini | |
420 | b2e3d87f | Nick Thomas | TRACE("Negotiation ended");
|
421 | 7a5ca864 | bellard | |
422 | b2e3d87f | Nick Thomas | return 0; |
423 | 7a5ca864 | bellard | } |
424 | 7a5ca864 | bellard | |
425 | 7a5ca864 | bellard | int nbd_disconnect(int fd) |
426 | 7a5ca864 | bellard | { |
427 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_QUE); |
428 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_DISCONNECT); |
429 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_SOCK); |
430 | b2e3d87f | Nick Thomas | return 0; |
431 | 7a5ca864 | bellard | } |
432 | 7a5ca864 | bellard | |
433 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
434 | 7a5ca864 | bellard | { |
435 | b2e3d87f | Nick Thomas | int ret;
|
436 | b2e3d87f | Nick Thomas | int serrno;
|
437 | 7a5ca864 | bellard | |
438 | b2e3d87f | Nick Thomas | TRACE("Doing NBD loop");
|
439 | 7a5ca864 | bellard | |
440 | b2e3d87f | Nick Thomas | ret = ioctl(fd, NBD_DO_IT); |
441 | fc19f8a0 | Paolo Bonzini | if (ret < 0 && errno == EPIPE) { |
442 | 74624688 | Paolo Bonzini | /* NBD_DO_IT normally returns EPIPE when someone has disconnected
|
443 | 74624688 | Paolo Bonzini | * the socket via NBD_DISCONNECT. We do not want to return 1 in
|
444 | 74624688 | Paolo Bonzini | * that case.
|
445 | 74624688 | Paolo Bonzini | */
|
446 | 74624688 | Paolo Bonzini | ret = 0;
|
447 | 74624688 | Paolo Bonzini | } |
448 | b2e3d87f | Nick Thomas | serrno = errno; |
449 | 7a5ca864 | bellard | |
450 | b2e3d87f | Nick Thomas | TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
451 | 7a5ca864 | bellard | |
452 | b2e3d87f | Nick Thomas | TRACE("Clearing NBD queue");
|
453 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_QUE); |
454 | 7a5ca864 | bellard | |
455 | b2e3d87f | Nick Thomas | TRACE("Clearing NBD socket");
|
456 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_SOCK); |
457 | 7a5ca864 | bellard | |
458 | b2e3d87f | Nick Thomas | errno = serrno; |
459 | b2e3d87f | Nick Thomas | return ret;
|
460 | 7a5ca864 | bellard | } |
461 | 03ff3ca3 | aliguori | #else
|
462 | 8e72506e | Paolo Bonzini | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
463 | 03ff3ca3 | aliguori | { |
464 | 185b4338 | Paolo Bonzini | return -ENOTSUP;
|
465 | 03ff3ca3 | aliguori | } |
466 | 03ff3ca3 | aliguori | |
467 | 03ff3ca3 | aliguori | int nbd_disconnect(int fd) |
468 | 03ff3ca3 | aliguori | { |
469 | 185b4338 | Paolo Bonzini | return -ENOTSUP;
|
470 | 03ff3ca3 | aliguori | } |
471 | 03ff3ca3 | aliguori | |
472 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
473 | 03ff3ca3 | aliguori | { |
474 | 185b4338 | Paolo Bonzini | return -ENOTSUP;
|
475 | 03ff3ca3 | aliguori | } |
476 | 03ff3ca3 | aliguori | #endif
|
477 | 7a5ca864 | bellard | |
478 | 94e7340b | Paolo Bonzini | ssize_t nbd_send_request(int csock, struct nbd_request *request) |
479 | 7a5ca864 | bellard | { |
480 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
481 | 185b4338 | Paolo Bonzini | ssize_t ret; |
482 | b2e3d87f | Nick Thomas | |
483 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
484 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
485 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
486 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
487 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
488 | 75818250 | ths | |
489 | b2e3d87f | Nick Thomas | TRACE("Sending request to client: "
|
490 | b2e3d87f | Nick Thomas | "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}", |
491 | b2e3d87f | Nick Thomas | request->from, request->len, request->handle, request->type); |
492 | b2e3d87f | Nick Thomas | |
493 | 185b4338 | Paolo Bonzini | ret = write_sync(csock, buf, sizeof(buf));
|
494 | 185b4338 | Paolo Bonzini | if (ret < 0) { |
495 | 185b4338 | Paolo Bonzini | return ret;
|
496 | 185b4338 | Paolo Bonzini | } |
497 | 185b4338 | Paolo Bonzini | |
498 | 185b4338 | Paolo Bonzini | if (ret != sizeof(buf)) { |
499 | b2e3d87f | Nick Thomas | LOG("writing to socket failed");
|
500 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
501 | b2e3d87f | Nick Thomas | } |
502 | b2e3d87f | Nick Thomas | return 0; |
503 | b2e3d87f | Nick Thomas | } |
504 | 75818250 | ths | |
505 | 94e7340b | Paolo Bonzini | static ssize_t nbd_receive_request(int csock, struct nbd_request *request) |
506 | 75818250 | ths | { |
507 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
508 | b2e3d87f | Nick Thomas | uint32_t magic; |
509 | 185b4338 | Paolo Bonzini | ssize_t ret; |
510 | b2e3d87f | Nick Thomas | |
511 | 185b4338 | Paolo Bonzini | ret = read_sync(csock, buf, sizeof(buf));
|
512 | 185b4338 | Paolo Bonzini | if (ret < 0) { |
513 | 185b4338 | Paolo Bonzini | return ret;
|
514 | 185b4338 | Paolo Bonzini | } |
515 | 185b4338 | Paolo Bonzini | |
516 | 185b4338 | Paolo Bonzini | if (ret != sizeof(buf)) { |
517 | b2e3d87f | Nick Thomas | LOG("read failed");
|
518 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
519 | b2e3d87f | Nick Thomas | } |
520 | b2e3d87f | Nick Thomas | |
521 | b2e3d87f | Nick Thomas | /* Request
|
522 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
523 | b2e3d87f | Nick Thomas | [ 4 .. 7] type (0 == READ, 1 == WRITE)
|
524 | b2e3d87f | Nick Thomas | [ 8 .. 15] handle
|
525 | b2e3d87f | Nick Thomas | [16 .. 23] from
|
526 | b2e3d87f | Nick Thomas | [24 .. 27] len
|
527 | b2e3d87f | Nick Thomas | */
|
528 | b2e3d87f | Nick Thomas | |
529 | b2e3d87f | Nick Thomas | magic = be32_to_cpup((uint32_t*)buf); |
530 | b2e3d87f | Nick Thomas | request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
531 | b2e3d87f | Nick Thomas | request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
532 | b2e3d87f | Nick Thomas | request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
533 | b2e3d87f | Nick Thomas | request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
534 | b2e3d87f | Nick Thomas | |
535 | b2e3d87f | Nick Thomas | TRACE("Got request: "
|
536 | b2e3d87f | Nick Thomas | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
537 | b2e3d87f | Nick Thomas | magic, request->type, request->from, request->len); |
538 | b2e3d87f | Nick Thomas | |
539 | b2e3d87f | Nick Thomas | if (magic != NBD_REQUEST_MAGIC) {
|
540 | b2e3d87f | Nick Thomas | LOG("invalid magic (got 0x%x)", magic);
|
541 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
542 | b2e3d87f | Nick Thomas | } |
543 | b2e3d87f | Nick Thomas | return 0; |
544 | 75818250 | ths | } |
545 | 75818250 | ths | |
546 | 94e7340b | Paolo Bonzini | ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply) |
547 | 75818250 | ths | { |
548 | b2e3d87f | Nick Thomas | uint8_t buf[NBD_REPLY_SIZE]; |
549 | b2e3d87f | Nick Thomas | uint32_t magic; |
550 | 185b4338 | Paolo Bonzini | ssize_t ret; |
551 | b2e3d87f | Nick Thomas | |
552 | 185b4338 | Paolo Bonzini | ret = read_sync(csock, buf, sizeof(buf));
|
553 | 185b4338 | Paolo Bonzini | if (ret < 0) { |
554 | 185b4338 | Paolo Bonzini | return ret;
|
555 | 185b4338 | Paolo Bonzini | } |
556 | 185b4338 | Paolo Bonzini | |
557 | 185b4338 | Paolo Bonzini | if (ret != sizeof(buf)) { |
558 | b2e3d87f | Nick Thomas | LOG("read failed");
|
559 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
560 | b2e3d87f | Nick Thomas | } |
561 | b2e3d87f | Nick Thomas | |
562 | b2e3d87f | Nick Thomas | /* Reply
|
563 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
564 | b2e3d87f | Nick Thomas | [ 4 .. 7] error (0 == no error)
|
565 | b2e3d87f | Nick Thomas | [ 7 .. 15] handle
|
566 | b2e3d87f | Nick Thomas | */
|
567 | b2e3d87f | Nick Thomas | |
568 | b2e3d87f | Nick Thomas | magic = be32_to_cpup((uint32_t*)buf); |
569 | b2e3d87f | Nick Thomas | reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
570 | b2e3d87f | Nick Thomas | reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
571 | b2e3d87f | Nick Thomas | |
572 | b2e3d87f | Nick Thomas | TRACE("Got reply: "
|
573 | b2e3d87f | Nick Thomas | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
574 | b2e3d87f | Nick Thomas | magic, reply->error, reply->handle); |
575 | b2e3d87f | Nick Thomas | |
576 | b2e3d87f | Nick Thomas | if (magic != NBD_REPLY_MAGIC) {
|
577 | b2e3d87f | Nick Thomas | LOG("invalid magic (got 0x%x)", magic);
|
578 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
579 | b2e3d87f | Nick Thomas | } |
580 | b2e3d87f | Nick Thomas | return 0; |
581 | 75818250 | ths | } |
582 | 75818250 | ths | |
583 | 94e7340b | Paolo Bonzini | static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply) |
584 | 75818250 | ths | { |
585 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8]; |
586 | 185b4338 | Paolo Bonzini | ssize_t ret; |
587 | b2e3d87f | Nick Thomas | |
588 | b2e3d87f | Nick Thomas | /* Reply
|
589 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
590 | b2e3d87f | Nick Thomas | [ 4 .. 7] error (0 == no error)
|
591 | b2e3d87f | Nick Thomas | [ 7 .. 15] handle
|
592 | b2e3d87f | Nick Thomas | */
|
593 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
594 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
595 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
596 | b2e3d87f | Nick Thomas | |
597 | b2e3d87f | Nick Thomas | TRACE("Sending response to client");
|
598 | b2e3d87f | Nick Thomas | |
599 | 185b4338 | Paolo Bonzini | ret = write_sync(csock, buf, sizeof(buf));
|
600 | 185b4338 | Paolo Bonzini | if (ret < 0) { |
601 | 185b4338 | Paolo Bonzini | return ret;
|
602 | 185b4338 | Paolo Bonzini | } |
603 | 185b4338 | Paolo Bonzini | |
604 | 185b4338 | Paolo Bonzini | if (ret != sizeof(buf)) { |
605 | b2e3d87f | Nick Thomas | LOG("writing to socket failed");
|
606 | 185b4338 | Paolo Bonzini | return -EINVAL;
|
607 | b2e3d87f | Nick Thomas | } |
608 | b2e3d87f | Nick Thomas | return 0; |
609 | 75818250 | ths | } |
610 | 7a5ca864 | bellard | |
611 | 41996e38 | Paolo Bonzini | #define MAX_NBD_REQUESTS 16 |
612 | 41996e38 | Paolo Bonzini | |
613 | d9a73806 | Paolo Bonzini | typedef struct NBDRequest NBDRequest; |
614 | d9a73806 | Paolo Bonzini | |
615 | d9a73806 | Paolo Bonzini | struct NBDRequest {
|
616 | d9a73806 | Paolo Bonzini | QSIMPLEQ_ENTRY(NBDRequest) entry; |
617 | 72deddc5 | Paolo Bonzini | NBDClient *client; |
618 | d9a73806 | Paolo Bonzini | uint8_t *data; |
619 | d9a73806 | Paolo Bonzini | }; |
620 | d9a73806 | Paolo Bonzini | |
621 | af49bbbe | Paolo Bonzini | struct NBDExport {
|
622 | af49bbbe | Paolo Bonzini | BlockDriverState *bs; |
623 | af49bbbe | Paolo Bonzini | off_t dev_offset; |
624 | af49bbbe | Paolo Bonzini | off_t size; |
625 | af49bbbe | Paolo Bonzini | uint32_t nbdflags; |
626 | d9a73806 | Paolo Bonzini | QSIMPLEQ_HEAD(, NBDRequest) requests; |
627 | af49bbbe | Paolo Bonzini | }; |
628 | af49bbbe | Paolo Bonzini | |
629 | 1743b515 | Paolo Bonzini | struct NBDClient {
|
630 | 1743b515 | Paolo Bonzini | int refcount;
|
631 | 1743b515 | Paolo Bonzini | void (*close)(NBDClient *client);
|
632 | 1743b515 | Paolo Bonzini | |
633 | 1743b515 | Paolo Bonzini | NBDExport *exp; |
634 | 1743b515 | Paolo Bonzini | int sock;
|
635 | 262db388 | Paolo Bonzini | |
636 | 262db388 | Paolo Bonzini | Coroutine *recv_coroutine; |
637 | 262db388 | Paolo Bonzini | |
638 | 262db388 | Paolo Bonzini | CoMutex send_lock; |
639 | 262db388 | Paolo Bonzini | Coroutine *send_coroutine; |
640 | 41996e38 | Paolo Bonzini | |
641 | 41996e38 | Paolo Bonzini | int nb_requests;
|
642 | 1743b515 | Paolo Bonzini | }; |
643 | 1743b515 | Paolo Bonzini | |
644 | 1743b515 | Paolo Bonzini | static void nbd_client_get(NBDClient *client) |
645 | 1743b515 | Paolo Bonzini | { |
646 | 1743b515 | Paolo Bonzini | client->refcount++; |
647 | 1743b515 | Paolo Bonzini | } |
648 | 1743b515 | Paolo Bonzini | |
649 | 1743b515 | Paolo Bonzini | static void nbd_client_put(NBDClient *client) |
650 | 1743b515 | Paolo Bonzini | { |
651 | 1743b515 | Paolo Bonzini | if (--client->refcount == 0) { |
652 | 1743b515 | Paolo Bonzini | g_free(client); |
653 | 1743b515 | Paolo Bonzini | } |
654 | 1743b515 | Paolo Bonzini | } |
655 | 1743b515 | Paolo Bonzini | |
656 | 1743b515 | Paolo Bonzini | static void nbd_client_close(NBDClient *client) |
657 | 1743b515 | Paolo Bonzini | { |
658 | 1743b515 | Paolo Bonzini | qemu_set_fd_handler2(client->sock, NULL, NULL, NULL, NULL); |
659 | 1743b515 | Paolo Bonzini | close(client->sock); |
660 | 1743b515 | Paolo Bonzini | client->sock = -1;
|
661 | 1743b515 | Paolo Bonzini | if (client->close) {
|
662 | 1743b515 | Paolo Bonzini | client->close(client); |
663 | 1743b515 | Paolo Bonzini | } |
664 | 1743b515 | Paolo Bonzini | nbd_client_put(client); |
665 | 1743b515 | Paolo Bonzini | } |
666 | 1743b515 | Paolo Bonzini | |
667 | 72deddc5 | Paolo Bonzini | static NBDRequest *nbd_request_get(NBDClient *client)
|
668 | d9a73806 | Paolo Bonzini | { |
669 | d9a73806 | Paolo Bonzini | NBDRequest *req; |
670 | 72deddc5 | Paolo Bonzini | NBDExport *exp = client->exp; |
671 | 72deddc5 | Paolo Bonzini | |
672 | 41996e38 | Paolo Bonzini | assert(client->nb_requests <= MAX_NBD_REQUESTS - 1);
|
673 | 41996e38 | Paolo Bonzini | client->nb_requests++; |
674 | 41996e38 | Paolo Bonzini | |
675 | d9a73806 | Paolo Bonzini | if (QSIMPLEQ_EMPTY(&exp->requests)) {
|
676 | d9a73806 | Paolo Bonzini | req = g_malloc0(sizeof(NBDRequest));
|
677 | d9a73806 | Paolo Bonzini | req->data = qemu_blockalign(exp->bs, NBD_BUFFER_SIZE); |
678 | d9a73806 | Paolo Bonzini | } else {
|
679 | d9a73806 | Paolo Bonzini | req = QSIMPLEQ_FIRST(&exp->requests); |
680 | d9a73806 | Paolo Bonzini | QSIMPLEQ_REMOVE_HEAD(&exp->requests, entry); |
681 | d9a73806 | Paolo Bonzini | } |
682 | 72deddc5 | Paolo Bonzini | nbd_client_get(client); |
683 | 72deddc5 | Paolo Bonzini | req->client = client; |
684 | d9a73806 | Paolo Bonzini | return req;
|
685 | d9a73806 | Paolo Bonzini | } |
686 | d9a73806 | Paolo Bonzini | |
687 | 72deddc5 | Paolo Bonzini | static void nbd_request_put(NBDRequest *req) |
688 | d9a73806 | Paolo Bonzini | { |
689 | 72deddc5 | Paolo Bonzini | NBDClient *client = req->client; |
690 | 72deddc5 | Paolo Bonzini | QSIMPLEQ_INSERT_HEAD(&client->exp->requests, req, entry); |
691 | 41996e38 | Paolo Bonzini | if (client->nb_requests-- == MAX_NBD_REQUESTS) {
|
692 | 41996e38 | Paolo Bonzini | qemu_notify_event(); |
693 | 41996e38 | Paolo Bonzini | } |
694 | 72deddc5 | Paolo Bonzini | nbd_client_put(client); |
695 | d9a73806 | Paolo Bonzini | } |
696 | d9a73806 | Paolo Bonzini | |
697 | af49bbbe | Paolo Bonzini | NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset, |
698 | af49bbbe | Paolo Bonzini | off_t size, uint32_t nbdflags) |
699 | af49bbbe | Paolo Bonzini | { |
700 | af49bbbe | Paolo Bonzini | NBDExport *exp = g_malloc0(sizeof(NBDExport));
|
701 | d9a73806 | Paolo Bonzini | QSIMPLEQ_INIT(&exp->requests); |
702 | af49bbbe | Paolo Bonzini | exp->bs = bs; |
703 | af49bbbe | Paolo Bonzini | exp->dev_offset = dev_offset; |
704 | af49bbbe | Paolo Bonzini | exp->nbdflags = nbdflags; |
705 | 38ceff04 | Paolo Bonzini | exp->size = size == -1 ? bdrv_getlength(bs) : size;
|
706 | af49bbbe | Paolo Bonzini | return exp;
|
707 | af49bbbe | Paolo Bonzini | } |
708 | af49bbbe | Paolo Bonzini | |
709 | af49bbbe | Paolo Bonzini | void nbd_export_close(NBDExport *exp)
|
710 | af49bbbe | Paolo Bonzini | { |
711 | d9a73806 | Paolo Bonzini | while (!QSIMPLEQ_EMPTY(&exp->requests)) {
|
712 | d9a73806 | Paolo Bonzini | NBDRequest *first = QSIMPLEQ_FIRST(&exp->requests); |
713 | d9a73806 | Paolo Bonzini | QSIMPLEQ_REMOVE_HEAD(&exp->requests, entry); |
714 | d9a73806 | Paolo Bonzini | qemu_vfree(first->data); |
715 | d9a73806 | Paolo Bonzini | g_free(first); |
716 | d9a73806 | Paolo Bonzini | } |
717 | d9a73806 | Paolo Bonzini | |
718 | af49bbbe | Paolo Bonzini | bdrv_close(exp->bs); |
719 | af49bbbe | Paolo Bonzini | g_free(exp); |
720 | af49bbbe | Paolo Bonzini | } |
721 | af49bbbe | Paolo Bonzini | |
722 | 41996e38 | Paolo Bonzini | static int nbd_can_read(void *opaque); |
723 | 262db388 | Paolo Bonzini | static void nbd_read(void *opaque); |
724 | 262db388 | Paolo Bonzini | static void nbd_restart_write(void *opaque); |
725 | 262db388 | Paolo Bonzini | |
726 | 94e7340b | Paolo Bonzini | static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply, |
727 | 94e7340b | Paolo Bonzini | int len)
|
728 | 22045592 | Paolo Bonzini | { |
729 | 72deddc5 | Paolo Bonzini | NBDClient *client = req->client; |
730 | 72deddc5 | Paolo Bonzini | int csock = client->sock;
|
731 | 94e7340b | Paolo Bonzini | ssize_t rc, ret; |
732 | 22045592 | Paolo Bonzini | |
733 | 262db388 | Paolo Bonzini | qemu_co_mutex_lock(&client->send_lock); |
734 | 41996e38 | Paolo Bonzini | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, |
735 | 41996e38 | Paolo Bonzini | nbd_restart_write, client); |
736 | 262db388 | Paolo Bonzini | client->send_coroutine = qemu_coroutine_self(); |
737 | 262db388 | Paolo Bonzini | |
738 | 22045592 | Paolo Bonzini | if (!len) {
|
739 | 22045592 | Paolo Bonzini | rc = nbd_send_reply(csock, reply); |
740 | 22045592 | Paolo Bonzini | } else {
|
741 | 22045592 | Paolo Bonzini | socket_set_cork(csock, 1);
|
742 | 22045592 | Paolo Bonzini | rc = nbd_send_reply(csock, reply); |
743 | fc19f8a0 | Paolo Bonzini | if (rc >= 0) { |
744 | 262db388 | Paolo Bonzini | ret = qemu_co_send(csock, req->data, len); |
745 | 22045592 | Paolo Bonzini | if (ret != len) {
|
746 | 185b4338 | Paolo Bonzini | rc = -EIO; |
747 | 22045592 | Paolo Bonzini | } |
748 | 22045592 | Paolo Bonzini | } |
749 | 22045592 | Paolo Bonzini | socket_set_cork(csock, 0);
|
750 | 22045592 | Paolo Bonzini | } |
751 | 262db388 | Paolo Bonzini | |
752 | 262db388 | Paolo Bonzini | client->send_coroutine = NULL;
|
753 | 41996e38 | Paolo Bonzini | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, NULL, client);
|
754 | 262db388 | Paolo Bonzini | qemu_co_mutex_unlock(&client->send_lock); |
755 | 22045592 | Paolo Bonzini | return rc;
|
756 | 22045592 | Paolo Bonzini | } |
757 | 22045592 | Paolo Bonzini | |
758 | 94e7340b | Paolo Bonzini | static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request) |
759 | a030b347 | Paolo Bonzini | { |
760 | 72deddc5 | Paolo Bonzini | NBDClient *client = req->client; |
761 | 72deddc5 | Paolo Bonzini | int csock = client->sock;
|
762 | 94e7340b | Paolo Bonzini | ssize_t rc; |
763 | a030b347 | Paolo Bonzini | |
764 | 262db388 | Paolo Bonzini | client->recv_coroutine = qemu_coroutine_self(); |
765 | 7fe7b68b | Paolo Bonzini | rc = nbd_receive_request(csock, request); |
766 | 7fe7b68b | Paolo Bonzini | if (rc < 0) { |
767 | 7fe7b68b | Paolo Bonzini | if (rc != -EAGAIN) {
|
768 | 7fe7b68b | Paolo Bonzini | rc = -EIO; |
769 | 7fe7b68b | Paolo Bonzini | } |
770 | a030b347 | Paolo Bonzini | goto out;
|
771 | a030b347 | Paolo Bonzini | } |
772 | a030b347 | Paolo Bonzini | |
773 | a030b347 | Paolo Bonzini | if (request->len > NBD_BUFFER_SIZE) {
|
774 | a030b347 | Paolo Bonzini | LOG("len (%u) is larger than max len (%u)",
|
775 | a030b347 | Paolo Bonzini | request->len, NBD_BUFFER_SIZE); |
776 | a030b347 | Paolo Bonzini | rc = -EINVAL; |
777 | a030b347 | Paolo Bonzini | goto out;
|
778 | a030b347 | Paolo Bonzini | } |
779 | a030b347 | Paolo Bonzini | |
780 | a030b347 | Paolo Bonzini | if ((request->from + request->len) < request->from) {
|
781 | a030b347 | Paolo Bonzini | LOG("integer overflow detected! "
|
782 | a030b347 | Paolo Bonzini | "you're probably being attacked");
|
783 | a030b347 | Paolo Bonzini | rc = -EINVAL; |
784 | a030b347 | Paolo Bonzini | goto out;
|
785 | a030b347 | Paolo Bonzini | } |
786 | a030b347 | Paolo Bonzini | |
787 | a030b347 | Paolo Bonzini | TRACE("Decoding type");
|
788 | a030b347 | Paolo Bonzini | |
789 | a030b347 | Paolo Bonzini | if ((request->type & NBD_CMD_MASK_COMMAND) == NBD_CMD_WRITE) {
|
790 | a030b347 | Paolo Bonzini | TRACE("Reading %u byte(s)", request->len);
|
791 | a030b347 | Paolo Bonzini | |
792 | 262db388 | Paolo Bonzini | if (qemu_co_recv(csock, req->data, request->len) != request->len) {
|
793 | a030b347 | Paolo Bonzini | LOG("reading from socket failed");
|
794 | a030b347 | Paolo Bonzini | rc = -EIO; |
795 | a030b347 | Paolo Bonzini | goto out;
|
796 | a030b347 | Paolo Bonzini | } |
797 | a030b347 | Paolo Bonzini | } |
798 | a030b347 | Paolo Bonzini | rc = 0;
|
799 | a030b347 | Paolo Bonzini | |
800 | a030b347 | Paolo Bonzini | out:
|
801 | 262db388 | Paolo Bonzini | client->recv_coroutine = NULL;
|
802 | a030b347 | Paolo Bonzini | return rc;
|
803 | a030b347 | Paolo Bonzini | } |
804 | a030b347 | Paolo Bonzini | |
805 | 262db388 | Paolo Bonzini | static void nbd_trip(void *opaque) |
806 | 75818250 | ths | { |
807 | 262db388 | Paolo Bonzini | NBDClient *client = opaque; |
808 | 72deddc5 | Paolo Bonzini | NBDRequest *req = nbd_request_get(client); |
809 | 1743b515 | Paolo Bonzini | NBDExport *exp = client->exp; |
810 | b2e3d87f | Nick Thomas | struct nbd_request request;
|
811 | b2e3d87f | Nick Thomas | struct nbd_reply reply;
|
812 | 94e7340b | Paolo Bonzini | ssize_t ret; |
813 | b2e3d87f | Nick Thomas | |
814 | b2e3d87f | Nick Thomas | TRACE("Reading request.");
|
815 | b2e3d87f | Nick Thomas | |
816 | 262db388 | Paolo Bonzini | ret = nbd_co_receive_request(req, &request); |
817 | 7fe7b68b | Paolo Bonzini | if (ret == -EAGAIN) {
|
818 | 7fe7b68b | Paolo Bonzini | goto done;
|
819 | 7fe7b68b | Paolo Bonzini | } |
820 | a030b347 | Paolo Bonzini | if (ret == -EIO) {
|
821 | d9a73806 | Paolo Bonzini | goto out;
|
822 | a030b347 | Paolo Bonzini | } |
823 | b2e3d87f | Nick Thomas | |
824 | fae69416 | Paolo Bonzini | reply.handle = request.handle; |
825 | fae69416 | Paolo Bonzini | reply.error = 0;
|
826 | fae69416 | Paolo Bonzini | |
827 | a030b347 | Paolo Bonzini | if (ret < 0) { |
828 | a030b347 | Paolo Bonzini | reply.error = -ret; |
829 | a030b347 | Paolo Bonzini | goto error_reply;
|
830 | b2e3d87f | Nick Thomas | } |
831 | b2e3d87f | Nick Thomas | |
832 | af49bbbe | Paolo Bonzini | if ((request.from + request.len) > exp->size) {
|
833 | b2e3d87f | Nick Thomas | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
834 | b2e3d87f | Nick Thomas | ", Offset: %" PRIu64 "\n", |
835 | af49bbbe | Paolo Bonzini | request.from, request.len, |
836 | 0fee8f34 | Stefan Weil | (uint64_t)exp->size, (uint64_t)exp->dev_offset); |
837 | b2e3d87f | Nick Thomas | LOG("requested operation past EOF--bad client?");
|
838 | fae69416 | Paolo Bonzini | goto invalid_request;
|
839 | b2e3d87f | Nick Thomas | } |
840 | b2e3d87f | Nick Thomas | |
841 | 2c7989a9 | Paolo Bonzini | switch (request.type & NBD_CMD_MASK_COMMAND) {
|
842 | b2e3d87f | Nick Thomas | case NBD_CMD_READ:
|
843 | b2e3d87f | Nick Thomas | TRACE("Request type is READ");
|
844 | b2e3d87f | Nick Thomas | |
845 | e25ceb76 | Paolo Bonzini | if (request.type & NBD_CMD_FLAG_FUA) {
|
846 | e25ceb76 | Paolo Bonzini | ret = bdrv_co_flush(exp->bs); |
847 | e25ceb76 | Paolo Bonzini | if (ret < 0) { |
848 | e25ceb76 | Paolo Bonzini | LOG("flush failed");
|
849 | e25ceb76 | Paolo Bonzini | reply.error = -ret; |
850 | e25ceb76 | Paolo Bonzini | goto error_reply;
|
851 | e25ceb76 | Paolo Bonzini | } |
852 | e25ceb76 | Paolo Bonzini | } |
853 | e25ceb76 | Paolo Bonzini | |
854 | af49bbbe | Paolo Bonzini | ret = bdrv_read(exp->bs, (request.from + exp->dev_offset) / 512,
|
855 | d9a73806 | Paolo Bonzini | req->data, request.len / 512);
|
856 | adcf6302 | Paolo Bonzini | if (ret < 0) { |
857 | b2e3d87f | Nick Thomas | LOG("reading from file failed");
|
858 | adcf6302 | Paolo Bonzini | reply.error = -ret; |
859 | fae69416 | Paolo Bonzini | goto error_reply;
|
860 | b2e3d87f | Nick Thomas | } |
861 | b2e3d87f | Nick Thomas | |
862 | b2e3d87f | Nick Thomas | TRACE("Read %u byte(s)", request.len);
|
863 | 262db388 | Paolo Bonzini | if (nbd_co_send_reply(req, &reply, request.len) < 0) |
864 | d9a73806 | Paolo Bonzini | goto out;
|
865 | b2e3d87f | Nick Thomas | break;
|
866 | b2e3d87f | Nick Thomas | case NBD_CMD_WRITE:
|
867 | b2e3d87f | Nick Thomas | TRACE("Request type is WRITE");
|
868 | b2e3d87f | Nick Thomas | |
869 | af49bbbe | Paolo Bonzini | if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
|
870 | b2e3d87f | Nick Thomas | TRACE("Server is read-only, return error");
|
871 | fae69416 | Paolo Bonzini | reply.error = EROFS; |
872 | fae69416 | Paolo Bonzini | goto error_reply;
|
873 | fae69416 | Paolo Bonzini | } |
874 | fae69416 | Paolo Bonzini | |
875 | fae69416 | Paolo Bonzini | TRACE("Writing to device");
|
876 | fae69416 | Paolo Bonzini | |
877 | af49bbbe | Paolo Bonzini | ret = bdrv_write(exp->bs, (request.from + exp->dev_offset) / 512,
|
878 | d9a73806 | Paolo Bonzini | req->data, request.len / 512);
|
879 | fae69416 | Paolo Bonzini | if (ret < 0) { |
880 | fae69416 | Paolo Bonzini | LOG("writing to file failed");
|
881 | fae69416 | Paolo Bonzini | reply.error = -ret; |
882 | fae69416 | Paolo Bonzini | goto error_reply;
|
883 | fae69416 | Paolo Bonzini | } |
884 | b2e3d87f | Nick Thomas | |
885 | fae69416 | Paolo Bonzini | if (request.type & NBD_CMD_FLAG_FUA) {
|
886 | 262db388 | Paolo Bonzini | ret = bdrv_co_flush(exp->bs); |
887 | adcf6302 | Paolo Bonzini | if (ret < 0) { |
888 | fae69416 | Paolo Bonzini | LOG("flush failed");
|
889 | adcf6302 | Paolo Bonzini | reply.error = -ret; |
890 | fae69416 | Paolo Bonzini | goto error_reply;
|
891 | 2c7989a9 | Paolo Bonzini | } |
892 | b2e3d87f | Nick Thomas | } |
893 | b2e3d87f | Nick Thomas | |
894 | fc19f8a0 | Paolo Bonzini | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
895 | d9a73806 | Paolo Bonzini | goto out;
|
896 | fc19f8a0 | Paolo Bonzini | } |
897 | b2e3d87f | Nick Thomas | break;
|
898 | b2e3d87f | Nick Thomas | case NBD_CMD_DISC:
|
899 | b2e3d87f | Nick Thomas | TRACE("Request type is DISCONNECT");
|
900 | b2e3d87f | Nick Thomas | errno = 0;
|
901 | 262db388 | Paolo Bonzini | goto out;
|
902 | 1486d04a | Paolo Bonzini | case NBD_CMD_FLUSH:
|
903 | 1486d04a | Paolo Bonzini | TRACE("Request type is FLUSH");
|
904 | 1486d04a | Paolo Bonzini | |
905 | 262db388 | Paolo Bonzini | ret = bdrv_co_flush(exp->bs); |
906 | 1486d04a | Paolo Bonzini | if (ret < 0) { |
907 | 1486d04a | Paolo Bonzini | LOG("flush failed");
|
908 | 1486d04a | Paolo Bonzini | reply.error = -ret; |
909 | 1486d04a | Paolo Bonzini | } |
910 | fc19f8a0 | Paolo Bonzini | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
911 | d9a73806 | Paolo Bonzini | goto out;
|
912 | fc19f8a0 | Paolo Bonzini | } |
913 | 1486d04a | Paolo Bonzini | break;
|
914 | 7a706633 | Paolo Bonzini | case NBD_CMD_TRIM:
|
915 | 7a706633 | Paolo Bonzini | TRACE("Request type is TRIM");
|
916 | 262db388 | Paolo Bonzini | ret = bdrv_co_discard(exp->bs, (request.from + exp->dev_offset) / 512,
|
917 | 262db388 | Paolo Bonzini | request.len / 512);
|
918 | 7a706633 | Paolo Bonzini | if (ret < 0) { |
919 | 7a706633 | Paolo Bonzini | LOG("discard failed");
|
920 | 7a706633 | Paolo Bonzini | reply.error = -ret; |
921 | 7a706633 | Paolo Bonzini | } |
922 | fc19f8a0 | Paolo Bonzini | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
923 | d9a73806 | Paolo Bonzini | goto out;
|
924 | fc19f8a0 | Paolo Bonzini | } |
925 | 7a706633 | Paolo Bonzini | break;
|
926 | b2e3d87f | Nick Thomas | default:
|
927 | b2e3d87f | Nick Thomas | LOG("invalid request type (%u) received", request.type);
|
928 | fae69416 | Paolo Bonzini | invalid_request:
|
929 | fae69416 | Paolo Bonzini | reply.error = -EINVAL; |
930 | fae69416 | Paolo Bonzini | error_reply:
|
931 | fc19f8a0 | Paolo Bonzini | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
932 | d9a73806 | Paolo Bonzini | goto out;
|
933 | fc19f8a0 | Paolo Bonzini | } |
934 | fae69416 | Paolo Bonzini | break;
|
935 | b2e3d87f | Nick Thomas | } |
936 | b2e3d87f | Nick Thomas | |
937 | b2e3d87f | Nick Thomas | TRACE("Request/Reply complete");
|
938 | b2e3d87f | Nick Thomas | |
939 | 7fe7b68b | Paolo Bonzini | done:
|
940 | 262db388 | Paolo Bonzini | nbd_request_put(req); |
941 | 262db388 | Paolo Bonzini | return;
|
942 | 262db388 | Paolo Bonzini | |
943 | d9a73806 | Paolo Bonzini | out:
|
944 | 72deddc5 | Paolo Bonzini | nbd_request_put(req); |
945 | 262db388 | Paolo Bonzini | nbd_client_close(client); |
946 | 7a5ca864 | bellard | } |
947 | af49bbbe | Paolo Bonzini | |
948 | 41996e38 | Paolo Bonzini | static int nbd_can_read(void *opaque) |
949 | 41996e38 | Paolo Bonzini | { |
950 | 41996e38 | Paolo Bonzini | NBDClient *client = opaque; |
951 | 41996e38 | Paolo Bonzini | |
952 | 41996e38 | Paolo Bonzini | return client->recv_coroutine || client->nb_requests < MAX_NBD_REQUESTS;
|
953 | 41996e38 | Paolo Bonzini | } |
954 | 41996e38 | Paolo Bonzini | |
955 | 1743b515 | Paolo Bonzini | static void nbd_read(void *opaque) |
956 | 1743b515 | Paolo Bonzini | { |
957 | 1743b515 | Paolo Bonzini | NBDClient *client = opaque; |
958 | 1743b515 | Paolo Bonzini | |
959 | 262db388 | Paolo Bonzini | if (client->recv_coroutine) {
|
960 | 262db388 | Paolo Bonzini | qemu_coroutine_enter(client->recv_coroutine, NULL);
|
961 | 262db388 | Paolo Bonzini | } else {
|
962 | 262db388 | Paolo Bonzini | qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client); |
963 | 1743b515 | Paolo Bonzini | } |
964 | 1743b515 | Paolo Bonzini | } |
965 | 1743b515 | Paolo Bonzini | |
966 | 262db388 | Paolo Bonzini | static void nbd_restart_write(void *opaque) |
967 | 262db388 | Paolo Bonzini | { |
968 | 262db388 | Paolo Bonzini | NBDClient *client = opaque; |
969 | 262db388 | Paolo Bonzini | |
970 | 262db388 | Paolo Bonzini | qemu_coroutine_enter(client->send_coroutine, NULL);
|
971 | 262db388 | Paolo Bonzini | } |
972 | 262db388 | Paolo Bonzini | |
973 | 1743b515 | Paolo Bonzini | NBDClient *nbd_client_new(NBDExport *exp, int csock,
|
974 | 1743b515 | Paolo Bonzini | void (*close)(NBDClient *))
|
975 | af49bbbe | Paolo Bonzini | { |
976 | 1743b515 | Paolo Bonzini | NBDClient *client; |
977 | fc19f8a0 | Paolo Bonzini | if (nbd_send_negotiate(csock, exp->size, exp->nbdflags) < 0) { |
978 | 1743b515 | Paolo Bonzini | return NULL; |
979 | 1743b515 | Paolo Bonzini | } |
980 | 1743b515 | Paolo Bonzini | client = g_malloc0(sizeof(NBDClient));
|
981 | 1743b515 | Paolo Bonzini | client->refcount = 1;
|
982 | 1743b515 | Paolo Bonzini | client->exp = exp; |
983 | 1743b515 | Paolo Bonzini | client->sock = csock; |
984 | 1743b515 | Paolo Bonzini | client->close = close; |
985 | 262db388 | Paolo Bonzini | qemu_co_mutex_init(&client->send_lock); |
986 | 41996e38 | Paolo Bonzini | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, NULL, client);
|
987 | 1743b515 | Paolo Bonzini | return client;
|
988 | af49bbbe | Paolo Bonzini | } |