qdev-monitor: Set properties after parent is assigned in device_add
[qemu.git] / qemu-io.c
1 /*
2 * Command line utility to exercise the QEMU I/O path.
3 *
4 * Copyright (C) 2009 Red Hat, Inc.
5 * Copyright (c) 2003-2005 Silicon Graphics, Inc.
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
8 * See the COPYING file in the top-level directory.
9 */
10 #include <sys/time.h>
11 #include <sys/types.h>
12 #include <stdarg.h>
13 #include <stdio.h>
14 #include <getopt.h>
15 #include <libgen.h>
16
17 #include "qemu-io.h"
18 #include "qemu/main-loop.h"
19 #include "qemu/option.h"
20 #include "qemu/config-file.h"
21 #include "qemu/readline.h"
22 #include "block/block_int.h"
23 #include "trace/control.h"
24
25 #define CMD_NOFILE_OK 0x01
26
27 char *progname;
28
29 BlockDriverState *qemuio_bs;
30 extern int qemuio_misalign;
31
32 /* qemu-io commands passed using -c */
33 static int ncmdline;
34 static char **cmdline;
35
36 static ReadLineState *readline_state;
37
38 static int close_f(BlockDriverState *bs, int argc, char **argv)
39 {
40 bdrv_unref(bs);
41 qemuio_bs = NULL;
42 return 0;
43 }
44
45 static const cmdinfo_t close_cmd = {
46 .name = "close",
47 .altname = "c",
48 .cfunc = close_f,
49 .oneline = "close the current open file",
50 };
51
52 static int openfile(char *name, int flags, int growable, QDict *opts)
53 {
54 Error *local_err = NULL;
55
56 if (qemuio_bs) {
57 fprintf(stderr, "file open already, try 'help close'\n");
58 return 1;
59 }
60
61 if (growable) {
62 if (bdrv_open(&qemuio_bs, name, NULL, opts, flags | BDRV_O_PROTOCOL,
63 NULL, &local_err))
64 {
65 fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
66 error_get_pretty(local_err));
67 error_free(local_err);
68 return 1;
69 }
70 } else {
71 qemuio_bs = bdrv_new("hda");
72
73 if (bdrv_open(&qemuio_bs, name, NULL, opts, flags, NULL, &local_err)
74 < 0)
75 {
76 fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
77 error_get_pretty(local_err));
78 error_free(local_err);
79 bdrv_unref(qemuio_bs);
80 qemuio_bs = NULL;
81 return 1;
82 }
83 }
84
85 return 0;
86 }
87
88 static void open_help(void)
89 {
90 printf(
91 "\n"
92 " opens a new file in the requested mode\n"
93 "\n"
94 " Example:\n"
95 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
96 "\n"
97 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
98 " -r, -- open file read-only\n"
99 " -s, -- use snapshot file\n"
100 " -n, -- disable host cache\n"
101 " -g, -- allow file to grow (only applies to protocols)\n"
102 " -o, -- options to be given to the block driver"
103 "\n");
104 }
105
106 static int open_f(BlockDriverState *bs, int argc, char **argv);
107
108 static const cmdinfo_t open_cmd = {
109 .name = "open",
110 .altname = "o",
111 .cfunc = open_f,
112 .argmin = 1,
113 .argmax = -1,
114 .flags = CMD_NOFILE_OK,
115 .args = "[-Crsn] [-o options] [path]",
116 .oneline = "open the file specified by path",
117 .help = open_help,
118 };
119
120 static QemuOptsList empty_opts = {
121 .name = "drive",
122 .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head),
123 .desc = {
124 /* no elements => accept any params */
125 { /* end of list */ }
126 },
127 };
128
129 static int open_f(BlockDriverState *bs, int argc, char **argv)
130 {
131 int flags = 0;
132 int readonly = 0;
133 int growable = 0;
134 int c;
135 QemuOpts *qopts;
136 QDict *opts = NULL;
137
138 while ((c = getopt(argc, argv, "snrgo:")) != EOF) {
139 switch (c) {
140 case 's':
141 flags |= BDRV_O_SNAPSHOT;
142 break;
143 case 'n':
144 flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
145 break;
146 case 'r':
147 readonly = 1;
148 break;
149 case 'g':
150 growable = 1;
151 break;
152 case 'o':
153 qopts = qemu_opts_parse(&empty_opts, optarg, 0);
154 if (qopts == NULL) {
155 printf("could not parse option list -- %s\n", optarg);
156 return 0;
157 }
158 opts = qemu_opts_to_qdict(qopts, opts);
159 qemu_opts_del(qopts);
160 break;
161 default:
162 return qemuio_command_usage(&open_cmd);
163 }
164 }
165
166 if (!readonly) {
167 flags |= BDRV_O_RDWR;
168 }
169
170 if (optind == argc - 1) {
171 return openfile(argv[optind], flags, growable, opts);
172 } else if (optind == argc) {
173 return openfile(NULL, flags, growable, opts);
174 } else {
175 return qemuio_command_usage(&open_cmd);
176 }
177 }
178
179 static int quit_f(BlockDriverState *bs, int argc, char **argv)
180 {
181 return 1;
182 }
183
184 static const cmdinfo_t quit_cmd = {
185 .name = "quit",
186 .altname = "q",
187 .cfunc = quit_f,
188 .argmin = -1,
189 .argmax = -1,
190 .flags = CMD_FLAG_GLOBAL,
191 .oneline = "exit the program",
192 };
193
194 static void usage(const char *name)
195 {
196 printf(
197 "Usage: %s [-h] [-V] [-rsnm] [-c cmd] ... [file]\n"
198 "QEMU Disk exerciser\n"
199 "\n"
200 " -c, --cmd command to execute\n"
201 " -r, --read-only export read-only\n"
202 " -s, --snapshot use snapshot file\n"
203 " -n, --nocache disable host cache\n"
204 " -g, --growable allow file to grow (only applies to protocols)\n"
205 " -m, --misalign misalign allocations for O_DIRECT\n"
206 " -k, --native-aio use kernel AIO implementation (on Linux only)\n"
207 " -t, --cache=MODE use the given cache mode for the image\n"
208 " -T, --trace FILE enable trace events listed in the given file\n"
209 " -h, --help display this help and exit\n"
210 " -V, --version output version information and exit\n"
211 "\n",
212 name);
213 }
214
215 static char *get_prompt(void)
216 {
217 static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
218
219 if (!prompt[0]) {
220 snprintf(prompt, sizeof(prompt), "%s> ", progname);
221 }
222
223 return prompt;
224 }
225
226 static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
227 const char *fmt, ...)
228 {
229 va_list ap;
230 va_start(ap, fmt);
231 vprintf(fmt, ap);
232 va_end(ap);
233 }
234
235 static void readline_flush_func(void *opaque)
236 {
237 fflush(stdout);
238 }
239
240 static void readline_func(void *opaque, const char *str, void *readline_opaque)
241 {
242 char **line = readline_opaque;
243 *line = g_strdup(str);
244 }
245
246 static void completion_match(const char *cmd, void *opaque)
247 {
248 readline_add_completion(readline_state, cmd);
249 }
250
251 static void readline_completion_func(void *opaque, const char *str)
252 {
253 readline_set_completion_index(readline_state, strlen(str));
254 qemuio_complete_command(str, completion_match, NULL);
255 }
256
257 static char *fetchline_readline(void)
258 {
259 char *line = NULL;
260
261 readline_start(readline_state, get_prompt(), 0, readline_func, &line);
262 while (!line) {
263 int ch = getchar();
264 if (ch == EOF) {
265 break;
266 }
267 readline_handle_byte(readline_state, ch);
268 }
269 return line;
270 }
271
272 #define MAXREADLINESZ 1024
273 static char *fetchline_fgets(void)
274 {
275 char *p, *line = g_malloc(MAXREADLINESZ);
276
277 if (!fgets(line, MAXREADLINESZ, stdin)) {
278 g_free(line);
279 return NULL;
280 }
281
282 p = line + strlen(line);
283 if (p != line && p[-1] == '\n') {
284 p[-1] = '\0';
285 }
286
287 return line;
288 }
289
290 static char *fetchline(void)
291 {
292 if (readline_state) {
293 return fetchline_readline();
294 } else {
295 return fetchline_fgets();
296 }
297 }
298
299 static void prep_fetchline(void *opaque)
300 {
301 int *fetchable = opaque;
302
303 qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
304 *fetchable= 1;
305 }
306
307 static void command_loop(void)
308 {
309 int i, done = 0, fetchable = 0, prompted = 0;
310 char *input;
311
312 for (i = 0; !done && i < ncmdline; i++) {
313 done = qemuio_command(qemuio_bs, cmdline[i]);
314 }
315 if (cmdline) {
316 g_free(cmdline);
317 return;
318 }
319
320 while (!done) {
321 if (!prompted) {
322 printf("%s", get_prompt());
323 fflush(stdout);
324 qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
325 prompted = 1;
326 }
327
328 main_loop_wait(false);
329
330 if (!fetchable) {
331 continue;
332 }
333
334 input = fetchline();
335 if (input == NULL) {
336 break;
337 }
338 done = qemuio_command(qemuio_bs, input);
339 g_free(input);
340
341 prompted = 0;
342 fetchable = 0;
343 }
344 qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
345 }
346
347 static void add_user_command(char *optarg)
348 {
349 cmdline = g_realloc(cmdline, ++ncmdline * sizeof(char *));
350 cmdline[ncmdline-1] = optarg;
351 }
352
353 static void reenable_tty_echo(void)
354 {
355 qemu_set_tty_echo(STDIN_FILENO, true);
356 }
357
358 int main(int argc, char **argv)
359 {
360 int readonly = 0;
361 int growable = 0;
362 const char *sopt = "hVc:d:rsnmgkt:T:";
363 const struct option lopt[] = {
364 { "help", 0, NULL, 'h' },
365 { "version", 0, NULL, 'V' },
366 { "offset", 1, NULL, 'o' },
367 { "cmd", 1, NULL, 'c' },
368 { "read-only", 0, NULL, 'r' },
369 { "snapshot", 0, NULL, 's' },
370 { "nocache", 0, NULL, 'n' },
371 { "misalign", 0, NULL, 'm' },
372 { "growable", 0, NULL, 'g' },
373 { "native-aio", 0, NULL, 'k' },
374 { "discard", 1, NULL, 'd' },
375 { "cache", 1, NULL, 't' },
376 { "trace", 1, NULL, 'T' },
377 { NULL, 0, NULL, 0 }
378 };
379 int c;
380 int opt_index = 0;
381 int flags = BDRV_O_UNMAP;
382
383 #ifdef CONFIG_POSIX
384 signal(SIGPIPE, SIG_IGN);
385 #endif
386
387 progname = basename(argv[0]);
388 qemu_init_exec_dir(argv[0]);
389
390 while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
391 switch (c) {
392 case 's':
393 flags |= BDRV_O_SNAPSHOT;
394 break;
395 case 'n':
396 flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
397 break;
398 case 'd':
399 if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
400 error_report("Invalid discard option: %s", optarg);
401 exit(1);
402 }
403 break;
404 case 'c':
405 add_user_command(optarg);
406 break;
407 case 'r':
408 readonly = 1;
409 break;
410 case 'm':
411 qemuio_misalign = 1;
412 break;
413 case 'g':
414 growable = 1;
415 break;
416 case 'k':
417 flags |= BDRV_O_NATIVE_AIO;
418 break;
419 case 't':
420 if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
421 error_report("Invalid cache option: %s", optarg);
422 exit(1);
423 }
424 break;
425 case 'T':
426 if (!trace_backend_init(optarg, NULL)) {
427 exit(1); /* error message will have been printed */
428 }
429 break;
430 case 'V':
431 printf("%s version %s\n", progname, QEMU_VERSION);
432 exit(0);
433 case 'h':
434 usage(progname);
435 exit(0);
436 default:
437 usage(progname);
438 exit(1);
439 }
440 }
441
442 if ((argc - optind) > 1) {
443 usage(progname);
444 exit(1);
445 }
446
447 qemu_init_main_loop();
448 bdrv_init();
449
450 /* initialize commands */
451 qemuio_add_command(&quit_cmd);
452 qemuio_add_command(&open_cmd);
453 qemuio_add_command(&close_cmd);
454
455 if (isatty(STDIN_FILENO)) {
456 readline_state = readline_init(readline_printf_func,
457 readline_flush_func,
458 NULL,
459 readline_completion_func);
460 qemu_set_tty_echo(STDIN_FILENO, false);
461 atexit(reenable_tty_echo);
462 }
463
464 /* open the device */
465 if (!readonly) {
466 flags |= BDRV_O_RDWR;
467 }
468
469 if ((argc - optind) == 1) {
470 openfile(argv[optind], flags, growable, NULL);
471 }
472 command_loop();
473
474 /*
475 * Make sure all outstanding requests complete before the program exits.
476 */
477 bdrv_drain_all();
478
479 if (qemuio_bs) {
480 bdrv_unref(qemuio_bs);
481 }
482 g_free(readline_state);
483 return 0;
484 }