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/*
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---|---|
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* QEMU disk image utility
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
25 |
#include "qemu-option.h" |
26 |
#include "osdep.h" |
27 |
#include "sysemu.h" |
28 |
#include "block_int.h" |
29 |
#include <stdio.h> |
30 |
|
31 |
#ifdef _WIN32
|
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#include <windows.h> |
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#endif
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|
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typedef struct img_cmd_t { |
36 |
const char *name; |
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int (*handler)(int argc, char **argv); |
38 |
} img_cmd_t; |
39 |
|
40 |
/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
|
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#define BDRV_O_FLAGS BDRV_O_CACHE_WB
|
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|
43 |
static void GCC_FMT_ATTR(1, 2) error(const char *fmt, ...) |
44 |
{ |
45 |
va_list ap; |
46 |
va_start(ap, fmt); |
47 |
fprintf(stderr, "qemu-img: ");
|
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vfprintf(stderr, fmt, ap); |
49 |
fprintf(stderr, "\n");
|
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va_end(ap); |
51 |
} |
52 |
|
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static void format_print(void *opaque, const char *name) |
54 |
{ |
55 |
printf(" %s", name);
|
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} |
57 |
|
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/* Please keep in synch with qemu-img.texi */
|
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static void help(void) |
60 |
{ |
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const char *help_msg = |
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"qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" |
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"usage: qemu-img command [command options]\n"
|
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"QEMU disk image utility\n"
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"\n"
|
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"Command syntax:\n"
|
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#define DEF(option, callback, arg_string) \
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" " arg_string "\n" |
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#include "qemu-img-cmds.h" |
70 |
#undef DEF
|
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#undef GEN_DOCS
|
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"\n"
|
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"Command parameters:\n"
|
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" 'filename' is a disk image filename\n"
|
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" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
|
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" 'size' is the disk image size in bytes. Optional suffixes\n"
|
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" 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
|
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" and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
|
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" 'output_filename' is the destination disk image filename\n"
|
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" 'output_fmt' is the destination format\n"
|
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" 'options' is a comma separated list of format specific options in a\n"
|
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" name=value format. Use -o ? for an overview of the options supported by the\n"
|
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" used format\n"
|
84 |
" '-c' indicates that target image must be compressed (qcow format only)\n"
|
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" '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
|
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" match exactly. The image doesn't need a working backing file before\n"
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" rebasing in this case (useful for renaming the backing file)\n"
|
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" '-h' with or without a command shows this help and lists the supported formats\n"
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"\n"
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"Parameters to snapshot subcommand:\n"
|
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" 'snapshot' is the name of the snapshot to create, apply or delete\n"
|
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" '-a' applies a snapshot (revert disk to saved state)\n"
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" '-c' creates a snapshot\n"
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" '-d' deletes a snapshot\n"
|
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" '-l' lists all snapshots in the given image\n";
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|
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printf("%s\nSupported formats:", help_msg);
|
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bdrv_iterate_format(format_print, NULL);
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printf("\n");
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exit(1);
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} |
102 |
|
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#if defined(WIN32)
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/* XXX: put correct support for win32 */
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static int read_password(char *buf, int buf_size) |
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{ |
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int c, i;
|
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printf("Password: ");
|
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fflush(stdout); |
110 |
i = 0;
|
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for(;;) {
|
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c = getchar(); |
113 |
if (c == '\n') |
114 |
break;
|
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if (i < (buf_size - 1)) |
116 |
buf[i++] = c; |
117 |
} |
118 |
buf[i] = '\0';
|
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return 0; |
120 |
} |
121 |
|
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#else
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|
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#include <termios.h> |
125 |
|
126 |
static struct termios oldtty; |
127 |
|
128 |
static void term_exit(void) |
129 |
{ |
130 |
tcsetattr (0, TCSANOW, &oldtty);
|
131 |
} |
132 |
|
133 |
static void term_init(void) |
134 |
{ |
135 |
struct termios tty;
|
136 |
|
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tcgetattr (0, &tty);
|
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oldtty = tty; |
139 |
|
140 |
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
141 |
|INLCR|IGNCR|ICRNL|IXON); |
142 |
tty.c_oflag |= OPOST; |
143 |
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); |
144 |
tty.c_cflag &= ~(CSIZE|PARENB); |
145 |
tty.c_cflag |= CS8; |
146 |
tty.c_cc[VMIN] = 1;
|
147 |
tty.c_cc[VTIME] = 0;
|
148 |
|
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tcsetattr (0, TCSANOW, &tty);
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150 |
|
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atexit(term_exit); |
152 |
} |
153 |
|
154 |
static int read_password(char *buf, int buf_size) |
155 |
{ |
156 |
uint8_t ch; |
157 |
int i, ret;
|
158 |
|
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printf("password: ");
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fflush(stdout); |
161 |
term_init(); |
162 |
i = 0;
|
163 |
for(;;) {
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164 |
ret = read(0, &ch, 1); |
165 |
if (ret == -1) { |
166 |
if (errno == EAGAIN || errno == EINTR) {
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167 |
continue;
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168 |
} else {
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169 |
ret = -1;
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170 |
break;
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171 |
} |
172 |
} else if (ret == 0) { |
173 |
ret = -1;
|
174 |
break;
|
175 |
} else {
|
176 |
if (ch == '\r') { |
177 |
ret = 0;
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break;
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179 |
} |
180 |
if (i < (buf_size - 1)) |
181 |
buf[i++] = ch; |
182 |
} |
183 |
} |
184 |
term_exit(); |
185 |
buf[i] = '\0';
|
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printf("\n");
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return ret;
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} |
189 |
#endif
|
190 |
|
191 |
static BlockDriverState *bdrv_new_open(const char *filename, |
192 |
const char *fmt, |
193 |
int flags)
|
194 |
{ |
195 |
BlockDriverState *bs; |
196 |
BlockDriver *drv; |
197 |
char password[256]; |
198 |
|
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bs = bdrv_new("");
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200 |
if (!bs) {
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201 |
error("Not enough memory");
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202 |
goto fail;
|
203 |
} |
204 |
if (fmt) {
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205 |
drv = bdrv_find_format(fmt); |
206 |
if (!drv) {
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error("Unknown file format '%s'", fmt);
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goto fail;
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209 |
} |
210 |
} else {
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211 |
drv = NULL;
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212 |
} |
213 |
if (bdrv_open(bs, filename, flags, drv) < 0) { |
214 |
error("Could not open '%s'", filename);
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goto fail;
|
216 |
} |
217 |
if (bdrv_is_encrypted(bs)) {
|
218 |
printf("Disk image '%s' is encrypted.\n", filename);
|
219 |
if (read_password(password, sizeof(password)) < 0) { |
220 |
error("No password given");
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221 |
goto fail;
|
222 |
} |
223 |
if (bdrv_set_key(bs, password) < 0) { |
224 |
error("invalid password");
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225 |
goto fail;
|
226 |
} |
227 |
} |
228 |
return bs;
|
229 |
fail:
|
230 |
if (bs) {
|
231 |
bdrv_delete(bs); |
232 |
} |
233 |
return NULL; |
234 |
} |
235 |
|
236 |
static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
237 |
int flags, const char *base_filename, const char *base_fmt) |
238 |
{ |
239 |
if (flags & BLOCK_FLAG_ENCRYPT) {
|
240 |
if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { |
241 |
error("Encryption not supported for file format '%s'", fmt);
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242 |
return -1; |
243 |
} |
244 |
} |
245 |
if (flags & BLOCK_FLAG_COMPAT6) {
|
246 |
if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { |
247 |
error("VMDK version 6 not supported for file format '%s'", fmt);
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248 |
return -1; |
249 |
} |
250 |
} |
251 |
|
252 |
if (base_filename) {
|
253 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
|
254 |
error("Backing file not supported for file format '%s'", fmt);
|
255 |
return -1; |
256 |
} |
257 |
} |
258 |
if (base_fmt) {
|
259 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
260 |
error("Backing file format not supported for file format '%s'", fmt);
|
261 |
return -1; |
262 |
} |
263 |
} |
264 |
return 0; |
265 |
} |
266 |
|
267 |
static int img_create(int argc, char **argv) |
268 |
{ |
269 |
int c, ret = 0, flags; |
270 |
const char *fmt = "raw"; |
271 |
const char *base_fmt = NULL; |
272 |
const char *filename; |
273 |
const char *base_filename = NULL; |
274 |
BlockDriver *drv, *proto_drv; |
275 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
276 |
char *options = NULL; |
277 |
|
278 |
flags = 0;
|
279 |
for(;;) {
|
280 |
c = getopt(argc, argv, "F:b:f:he6o:");
|
281 |
if (c == -1) |
282 |
break;
|
283 |
switch(c) {
|
284 |
case 'h': |
285 |
help(); |
286 |
break;
|
287 |
case 'F': |
288 |
base_fmt = optarg; |
289 |
break;
|
290 |
case 'b': |
291 |
base_filename = optarg; |
292 |
break;
|
293 |
case 'f': |
294 |
fmt = optarg; |
295 |
break;
|
296 |
case 'e': |
297 |
flags |= BLOCK_FLAG_ENCRYPT; |
298 |
break;
|
299 |
case '6': |
300 |
flags |= BLOCK_FLAG_COMPAT6; |
301 |
break;
|
302 |
case 'o': |
303 |
options = optarg; |
304 |
break;
|
305 |
} |
306 |
} |
307 |
|
308 |
/* Get the filename */
|
309 |
if (optind >= argc)
|
310 |
help(); |
311 |
filename = argv[optind++]; |
312 |
|
313 |
/* Find driver and parse its options */
|
314 |
drv = bdrv_find_format(fmt); |
315 |
if (!drv) {
|
316 |
error("Unknown file format '%s'", fmt);
|
317 |
return 1; |
318 |
} |
319 |
|
320 |
proto_drv = bdrv_find_protocol(filename); |
321 |
if (!proto_drv) {
|
322 |
error("Unknown protocol '%s'", filename);
|
323 |
return 1; |
324 |
} |
325 |
|
326 |
create_options = append_option_parameters(create_options, |
327 |
drv->create_options); |
328 |
create_options = append_option_parameters(create_options, |
329 |
proto_drv->create_options); |
330 |
|
331 |
if (options && !strcmp(options, "?")) { |
332 |
print_option_help(create_options); |
333 |
goto out;
|
334 |
} |
335 |
|
336 |
/* Create parameter list with default values */
|
337 |
param = parse_option_parameters("", create_options, param);
|
338 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
|
339 |
|
340 |
/* Parse -o options */
|
341 |
if (options) {
|
342 |
param = parse_option_parameters(options, create_options, param); |
343 |
if (param == NULL) { |
344 |
error("Invalid options for file format '%s'.", fmt);
|
345 |
ret = -1;
|
346 |
goto out;
|
347 |
} |
348 |
} |
349 |
|
350 |
/* Add size to parameters */
|
351 |
if (optind < argc) {
|
352 |
set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); |
353 |
} |
354 |
|
355 |
/* Add old-style options to parameters */
|
356 |
ret = add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
357 |
if (ret < 0) { |
358 |
goto out;
|
359 |
} |
360 |
|
361 |
// The size for the image must always be specified, with one exception:
|
362 |
// If we are using a backing file, we can obtain the size from there
|
363 |
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
364 |
|
365 |
QEMUOptionParameter *backing_file = |
366 |
get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
367 |
QEMUOptionParameter *backing_fmt = |
368 |
get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
369 |
|
370 |
if (backing_file && backing_file->value.s) {
|
371 |
BlockDriverState *bs; |
372 |
uint64_t size; |
373 |
const char *fmt = NULL; |
374 |
char buf[32]; |
375 |
|
376 |
if (backing_fmt && backing_fmt->value.s) {
|
377 |
if (bdrv_find_format(backing_fmt->value.s)) {
|
378 |
fmt = backing_fmt->value.s; |
379 |
} else {
|
380 |
error("Unknown backing file format '%s'",
|
381 |
backing_fmt->value.s); |
382 |
ret = -1;
|
383 |
goto out;
|
384 |
} |
385 |
} |
386 |
|
387 |
bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); |
388 |
if (!bs) {
|
389 |
ret = -1;
|
390 |
goto out;
|
391 |
} |
392 |
bdrv_get_geometry(bs, &size); |
393 |
size *= 512;
|
394 |
bdrv_delete(bs); |
395 |
|
396 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
397 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
398 |
} else {
|
399 |
error("Image creation needs a size parameter");
|
400 |
ret = -1;
|
401 |
goto out;
|
402 |
} |
403 |
} |
404 |
|
405 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
406 |
print_option_parameters(param); |
407 |
puts("");
|
408 |
|
409 |
ret = bdrv_create(drv, filename, param); |
410 |
free_option_parameters(create_options); |
411 |
free_option_parameters(param); |
412 |
|
413 |
if (ret < 0) { |
414 |
if (ret == -ENOTSUP) {
|
415 |
error("Formatting or formatting option not supported for file format '%s'", fmt);
|
416 |
} else if (ret == -EFBIG) { |
417 |
error("The image size is too large for file format '%s'", fmt);
|
418 |
} else {
|
419 |
error("%s: error while creating %s: %s", filename, fmt, strerror(-ret));
|
420 |
} |
421 |
} |
422 |
out:
|
423 |
if (ret) {
|
424 |
return 1; |
425 |
} |
426 |
return 0; |
427 |
} |
428 |
|
429 |
/*
|
430 |
* Checks an image for consistency. Exit codes:
|
431 |
*
|
432 |
* 0 - Check completed, image is good
|
433 |
* 1 - Check not completed because of internal errors
|
434 |
* 2 - Check completed, image is corrupted
|
435 |
* 3 - Check completed, image has leaked clusters, but is good otherwise
|
436 |
*/
|
437 |
static int img_check(int argc, char **argv) |
438 |
{ |
439 |
int c, ret;
|
440 |
const char *filename, *fmt; |
441 |
BlockDriverState *bs; |
442 |
BdrvCheckResult result; |
443 |
|
444 |
fmt = NULL;
|
445 |
for(;;) {
|
446 |
c = getopt(argc, argv, "f:h");
|
447 |
if (c == -1) |
448 |
break;
|
449 |
switch(c) {
|
450 |
case 'h': |
451 |
help(); |
452 |
break;
|
453 |
case 'f': |
454 |
fmt = optarg; |
455 |
break;
|
456 |
} |
457 |
} |
458 |
if (optind >= argc)
|
459 |
help(); |
460 |
filename = argv[optind++]; |
461 |
|
462 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
463 |
if (!bs) {
|
464 |
return 1; |
465 |
} |
466 |
ret = bdrv_check(bs, &result); |
467 |
|
468 |
if (ret == -ENOTSUP) {
|
469 |
error("This image format does not support checks");
|
470 |
bdrv_delete(bs); |
471 |
return 1; |
472 |
} |
473 |
|
474 |
if (!(result.corruptions || result.leaks || result.check_errors)) {
|
475 |
printf("No errors were found on the image.\n");
|
476 |
} else {
|
477 |
if (result.corruptions) {
|
478 |
printf("\n%d errors were found on the image.\n"
|
479 |
"Data may be corrupted, or further writes to the image "
|
480 |
"may corrupt it.\n",
|
481 |
result.corruptions); |
482 |
} |
483 |
|
484 |
if (result.leaks) {
|
485 |
printf("\n%d leaked clusters were found on the image.\n"
|
486 |
"This means waste of disk space, but no harm to data.\n",
|
487 |
result.leaks); |
488 |
} |
489 |
|
490 |
if (result.check_errors) {
|
491 |
printf("\n%d internal errors have occurred during the check.\n",
|
492 |
result.check_errors); |
493 |
} |
494 |
} |
495 |
|
496 |
bdrv_delete(bs); |
497 |
|
498 |
if (ret < 0 || result.check_errors) { |
499 |
printf("\nAn error has occurred during the check: %s\n"
|
500 |
"The check is not complete and may have missed error.\n",
|
501 |
strerror(-ret)); |
502 |
return 1; |
503 |
} |
504 |
|
505 |
if (result.corruptions) {
|
506 |
return 2; |
507 |
} else if (result.leaks) { |
508 |
return 3; |
509 |
} else {
|
510 |
return 0; |
511 |
} |
512 |
} |
513 |
|
514 |
static int img_commit(int argc, char **argv) |
515 |
{ |
516 |
int c, ret;
|
517 |
const char *filename, *fmt; |
518 |
BlockDriverState *bs; |
519 |
|
520 |
fmt = NULL;
|
521 |
for(;;) {
|
522 |
c = getopt(argc, argv, "f:h");
|
523 |
if (c == -1) |
524 |
break;
|
525 |
switch(c) {
|
526 |
case 'h': |
527 |
help(); |
528 |
break;
|
529 |
case 'f': |
530 |
fmt = optarg; |
531 |
break;
|
532 |
} |
533 |
} |
534 |
if (optind >= argc)
|
535 |
help(); |
536 |
filename = argv[optind++]; |
537 |
|
538 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
539 |
if (!bs) {
|
540 |
return 1; |
541 |
} |
542 |
ret = bdrv_commit(bs); |
543 |
switch(ret) {
|
544 |
case 0: |
545 |
printf("Image committed.\n");
|
546 |
break;
|
547 |
case -ENOENT:
|
548 |
error("No disk inserted");
|
549 |
break;
|
550 |
case -EACCES:
|
551 |
error("Image is read-only");
|
552 |
break;
|
553 |
case -ENOTSUP:
|
554 |
error("Image is already committed");
|
555 |
break;
|
556 |
default:
|
557 |
error("Error while committing image");
|
558 |
break;
|
559 |
} |
560 |
|
561 |
bdrv_delete(bs); |
562 |
if (ret) {
|
563 |
return 1; |
564 |
} |
565 |
return 0; |
566 |
} |
567 |
|
568 |
static int is_not_zero(const uint8_t *sector, int len) |
569 |
{ |
570 |
int i;
|
571 |
len >>= 2;
|
572 |
for(i = 0;i < len; i++) { |
573 |
if (((uint32_t *)sector)[i] != 0) |
574 |
return 1; |
575 |
} |
576 |
return 0; |
577 |
} |
578 |
|
579 |
/*
|
580 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
581 |
* a non-NUL byte.
|
582 |
*
|
583 |
* 'pnum' is set to the number of sectors (including and immediately following
|
584 |
* the first one) that are known to be in the same allocated/unallocated state.
|
585 |
*/
|
586 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
587 |
{ |
588 |
int v, i;
|
589 |
|
590 |
if (n <= 0) { |
591 |
*pnum = 0;
|
592 |
return 0; |
593 |
} |
594 |
v = is_not_zero(buf, 512);
|
595 |
for(i = 1; i < n; i++) { |
596 |
buf += 512;
|
597 |
if (v != is_not_zero(buf, 512)) |
598 |
break;
|
599 |
} |
600 |
*pnum = i; |
601 |
return v;
|
602 |
} |
603 |
|
604 |
/*
|
605 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
606 |
* buffers matches, non-zero otherwise.
|
607 |
*
|
608 |
* pnum is set to the number of sectors (including and immediately following
|
609 |
* the first one) that are known to have the same comparison result
|
610 |
*/
|
611 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
612 |
int *pnum)
|
613 |
{ |
614 |
int res, i;
|
615 |
|
616 |
if (n <= 0) { |
617 |
*pnum = 0;
|
618 |
return 0; |
619 |
} |
620 |
|
621 |
res = !!memcmp(buf1, buf2, 512);
|
622 |
for(i = 1; i < n; i++) { |
623 |
buf1 += 512;
|
624 |
buf2 += 512;
|
625 |
|
626 |
if (!!memcmp(buf1, buf2, 512) != res) { |
627 |
break;
|
628 |
} |
629 |
} |
630 |
|
631 |
*pnum = i; |
632 |
return res;
|
633 |
} |
634 |
|
635 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
636 |
|
637 |
static int img_convert(int argc, char **argv) |
638 |
{ |
639 |
int c, ret = 0, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors; |
640 |
const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
641 |
BlockDriver *drv, *proto_drv; |
642 |
BlockDriverState **bs = NULL, *out_bs = NULL; |
643 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
644 |
uint64_t bs_sectors; |
645 |
uint8_t * buf = NULL;
|
646 |
const uint8_t *buf1;
|
647 |
BlockDriverInfo bdi; |
648 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
649 |
QEMUOptionParameter *out_baseimg_param; |
650 |
char *options = NULL; |
651 |
const char *snapshot_name = NULL; |
652 |
|
653 |
fmt = NULL;
|
654 |
out_fmt = "raw";
|
655 |
out_baseimg = NULL;
|
656 |
flags = 0;
|
657 |
for(;;) {
|
658 |
c = getopt(argc, argv, "f:O:B:s:hce6o:");
|
659 |
if (c == -1) |
660 |
break;
|
661 |
switch(c) {
|
662 |
case 'h': |
663 |
help(); |
664 |
break;
|
665 |
case 'f': |
666 |
fmt = optarg; |
667 |
break;
|
668 |
case 'O': |
669 |
out_fmt = optarg; |
670 |
break;
|
671 |
case 'B': |
672 |
out_baseimg = optarg; |
673 |
break;
|
674 |
case 'c': |
675 |
flags |= BLOCK_FLAG_COMPRESS; |
676 |
break;
|
677 |
case 'e': |
678 |
flags |= BLOCK_FLAG_ENCRYPT; |
679 |
break;
|
680 |
case '6': |
681 |
flags |= BLOCK_FLAG_COMPAT6; |
682 |
break;
|
683 |
case 'o': |
684 |
options = optarg; |
685 |
break;
|
686 |
case 's': |
687 |
snapshot_name = optarg; |
688 |
break;
|
689 |
} |
690 |
} |
691 |
|
692 |
bs_n = argc - optind - 1;
|
693 |
if (bs_n < 1) help(); |
694 |
|
695 |
out_filename = argv[argc - 1];
|
696 |
|
697 |
if (bs_n > 1 && out_baseimg) { |
698 |
error("-B makes no sense when concatenating multiple input images");
|
699 |
return 1; |
700 |
} |
701 |
|
702 |
bs = calloc(bs_n, sizeof(BlockDriverState *));
|
703 |
if (!bs) {
|
704 |
error("Out of memory");
|
705 |
return 1; |
706 |
} |
707 |
|
708 |
total_sectors = 0;
|
709 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
710 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
711 |
if (!bs[bs_i]) {
|
712 |
error("Could not open '%s'", argv[optind + bs_i]);
|
713 |
ret = -1;
|
714 |
goto out;
|
715 |
} |
716 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
717 |
total_sectors += bs_sectors; |
718 |
} |
719 |
|
720 |
if (snapshot_name != NULL) { |
721 |
if (bs_n > 1) { |
722 |
error("No support for concatenating multiple snapshot\n");
|
723 |
ret = -1;
|
724 |
goto out;
|
725 |
} |
726 |
if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { |
727 |
error("Failed to load snapshot\n");
|
728 |
ret = -1;
|
729 |
goto out;
|
730 |
} |
731 |
} |
732 |
|
733 |
/* Find driver and parse its options */
|
734 |
drv = bdrv_find_format(out_fmt); |
735 |
if (!drv) {
|
736 |
error("Unknown file format '%s'", out_fmt);
|
737 |
ret = -1;
|
738 |
goto out;
|
739 |
} |
740 |
|
741 |
proto_drv = bdrv_find_protocol(out_filename); |
742 |
if (!proto_drv) {
|
743 |
error("Unknown protocol '%s'", out_filename);
|
744 |
ret = -1;
|
745 |
goto out;
|
746 |
} |
747 |
|
748 |
create_options = append_option_parameters(create_options, |
749 |
drv->create_options); |
750 |
create_options = append_option_parameters(create_options, |
751 |
proto_drv->create_options); |
752 |
if (options && !strcmp(options, "?")) { |
753 |
print_option_help(create_options); |
754 |
goto out;
|
755 |
} |
756 |
|
757 |
if (options) {
|
758 |
param = parse_option_parameters(options, create_options, param); |
759 |
if (param == NULL) { |
760 |
error("Invalid options for file format '%s'.", out_fmt);
|
761 |
ret = -1;
|
762 |
goto out;
|
763 |
} |
764 |
} else {
|
765 |
param = parse_option_parameters("", create_options, param);
|
766 |
} |
767 |
|
768 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
769 |
ret = add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
|
770 |
if (ret < 0) { |
771 |
goto out;
|
772 |
} |
773 |
|
774 |
/* Get backing file name if -o backing_file was used */
|
775 |
out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
776 |
if (out_baseimg_param) {
|
777 |
out_baseimg = out_baseimg_param->value.s; |
778 |
} |
779 |
|
780 |
/* Check if compression is supported */
|
781 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
782 |
QEMUOptionParameter *encryption = |
783 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
784 |
|
785 |
if (!drv->bdrv_write_compressed) {
|
786 |
error("Compression not supported for this file format");
|
787 |
ret = -1;
|
788 |
goto out;
|
789 |
} |
790 |
|
791 |
if (encryption && encryption->value.n) {
|
792 |
error("Compression and encryption not supported at the same time");
|
793 |
ret = -1;
|
794 |
goto out;
|
795 |
} |
796 |
} |
797 |
|
798 |
/* Create the new image */
|
799 |
ret = bdrv_create(drv, out_filename, param); |
800 |
if (ret < 0) { |
801 |
if (ret == -ENOTSUP) {
|
802 |
error("Formatting not supported for file format '%s'", out_fmt);
|
803 |
} else if (ret == -EFBIG) { |
804 |
error("The image size is too large for file format '%s'", out_fmt);
|
805 |
} else {
|
806 |
error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret));
|
807 |
} |
808 |
goto out;
|
809 |
} |
810 |
|
811 |
out_bs = bdrv_new_open(out_filename, out_fmt, |
812 |
BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH); |
813 |
if (!out_bs) {
|
814 |
ret = -1;
|
815 |
goto out;
|
816 |
} |
817 |
|
818 |
bs_i = 0;
|
819 |
bs_offset = 0;
|
820 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
821 |
buf = qemu_malloc(IO_BUF_SIZE); |
822 |
|
823 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
824 |
ret = bdrv_get_info(out_bs, &bdi); |
825 |
if (ret < 0) { |
826 |
error("could not get block driver info");
|
827 |
goto out;
|
828 |
} |
829 |
cluster_size = bdi.cluster_size; |
830 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { |
831 |
error("invalid cluster size");
|
832 |
ret = -1;
|
833 |
goto out;
|
834 |
} |
835 |
cluster_sectors = cluster_size >> 9;
|
836 |
sector_num = 0;
|
837 |
for(;;) {
|
838 |
int64_t bs_num; |
839 |
int remainder;
|
840 |
uint8_t *buf2; |
841 |
|
842 |
nb_sectors = total_sectors - sector_num; |
843 |
if (nb_sectors <= 0) |
844 |
break;
|
845 |
if (nb_sectors >= cluster_sectors)
|
846 |
n = cluster_sectors; |
847 |
else
|
848 |
n = nb_sectors; |
849 |
|
850 |
bs_num = sector_num - bs_offset; |
851 |
assert (bs_num >= 0);
|
852 |
remainder = n; |
853 |
buf2 = buf; |
854 |
while (remainder > 0) { |
855 |
int nlow;
|
856 |
while (bs_num == bs_sectors) {
|
857 |
bs_i++; |
858 |
assert (bs_i < bs_n); |
859 |
bs_offset += bs_sectors; |
860 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
861 |
bs_num = 0;
|
862 |
/* printf("changing part: sector_num=%" PRId64 ", "
|
863 |
"bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
|
864 |
"\n", sector_num, bs_i, bs_offset, bs_sectors); */
|
865 |
} |
866 |
assert (bs_num < bs_sectors); |
867 |
|
868 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
869 |
|
870 |
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); |
871 |
if (ret < 0) { |
872 |
error("error while reading");
|
873 |
goto out;
|
874 |
} |
875 |
|
876 |
buf2 += nlow * 512;
|
877 |
bs_num += nlow; |
878 |
|
879 |
remainder -= nlow; |
880 |
} |
881 |
assert (remainder == 0);
|
882 |
|
883 |
if (n < cluster_sectors)
|
884 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
885 |
if (is_not_zero(buf, cluster_size)) {
|
886 |
ret = bdrv_write_compressed(out_bs, sector_num, buf, |
887 |
cluster_sectors); |
888 |
if (ret != 0) { |
889 |
error("error while compressing sector %" PRId64,
|
890 |
sector_num); |
891 |
goto out;
|
892 |
} |
893 |
} |
894 |
sector_num += n; |
895 |
} |
896 |
/* signal EOF to align */
|
897 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
898 |
} else {
|
899 |
int has_zero_init = bdrv_has_zero_init(out_bs);
|
900 |
|
901 |
sector_num = 0; // total number of sectors converted so far |
902 |
for(;;) {
|
903 |
nb_sectors = total_sectors - sector_num; |
904 |
if (nb_sectors <= 0) |
905 |
break;
|
906 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) |
907 |
n = (IO_BUF_SIZE / 512);
|
908 |
else
|
909 |
n = nb_sectors; |
910 |
|
911 |
while (sector_num - bs_offset >= bs_sectors) {
|
912 |
bs_i ++; |
913 |
assert (bs_i < bs_n); |
914 |
bs_offset += bs_sectors; |
915 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
916 |
/* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, "
|
917 |
"bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n",
|
918 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
919 |
} |
920 |
|
921 |
if (n > bs_offset + bs_sectors - sector_num)
|
922 |
n = bs_offset + bs_sectors - sector_num; |
923 |
|
924 |
if (has_zero_init) {
|
925 |
/* If the output image is being created as a copy on write image,
|
926 |
assume that sectors which are unallocated in the input image
|
927 |
are present in both the output's and input's base images (no
|
928 |
need to copy them). */
|
929 |
if (out_baseimg) {
|
930 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
931 |
n, &n1)) { |
932 |
sector_num += n1; |
933 |
continue;
|
934 |
} |
935 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
936 |
only those as they may be followed by unallocated sectors. */
|
937 |
n = n1; |
938 |
} |
939 |
} else {
|
940 |
n1 = n; |
941 |
} |
942 |
|
943 |
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); |
944 |
if (ret < 0) { |
945 |
error("error while reading");
|
946 |
goto out;
|
947 |
} |
948 |
/* NOTE: at the same time we convert, we do not write zero
|
949 |
sectors to have a chance to compress the image. Ideally, we
|
950 |
should add a specific call to have the info to go faster */
|
951 |
buf1 = buf; |
952 |
while (n > 0) { |
953 |
/* If the output image is being created as a copy on write image,
|
954 |
copy all sectors even the ones containing only NUL bytes,
|
955 |
because they may differ from the sectors in the base image.
|
956 |
|
957 |
If the output is to a host device, we also write out
|
958 |
sectors that are entirely 0, since whatever data was
|
959 |
already there is garbage, not 0s. */
|
960 |
if (!has_zero_init || out_baseimg ||
|
961 |
is_allocated_sectors(buf1, n, &n1)) { |
962 |
ret = bdrv_write(out_bs, sector_num, buf1, n1); |
963 |
if (ret < 0) { |
964 |
error("error while writing");
|
965 |
goto out;
|
966 |
} |
967 |
} |
968 |
sector_num += n1; |
969 |
n -= n1; |
970 |
buf1 += n1 * 512;
|
971 |
} |
972 |
} |
973 |
} |
974 |
out:
|
975 |
free_option_parameters(create_options); |
976 |
free_option_parameters(param); |
977 |
qemu_free(buf); |
978 |
if (out_bs) {
|
979 |
bdrv_delete(out_bs); |
980 |
} |
981 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
982 |
if (bs[bs_i]) {
|
983 |
bdrv_delete(bs[bs_i]); |
984 |
} |
985 |
} |
986 |
free(bs); |
987 |
if (ret) {
|
988 |
return 1; |
989 |
} |
990 |
return 0; |
991 |
} |
992 |
|
993 |
#ifdef _WIN32
|
994 |
static int64_t get_allocated_file_size(const char *filename) |
995 |
{ |
996 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
997 |
get_compressed_t get_compressed; |
998 |
struct _stati64 st;
|
999 |
|
1000 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
1001 |
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
1002 |
if (get_compressed) {
|
1003 |
DWORD high, low; |
1004 |
low = get_compressed(filename, &high); |
1005 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
1006 |
return (((int64_t) high) << 32) + low; |
1007 |
} |
1008 |
|
1009 |
if (_stati64(filename, &st) < 0) |
1010 |
return -1; |
1011 |
return st.st_size;
|
1012 |
} |
1013 |
#else
|
1014 |
static int64_t get_allocated_file_size(const char *filename) |
1015 |
{ |
1016 |
struct stat st;
|
1017 |
if (stat(filename, &st) < 0) |
1018 |
return -1; |
1019 |
return (int64_t)st.st_blocks * 512; |
1020 |
} |
1021 |
#endif
|
1022 |
|
1023 |
static void dump_snapshots(BlockDriverState *bs) |
1024 |
{ |
1025 |
QEMUSnapshotInfo *sn_tab, *sn; |
1026 |
int nb_sns, i;
|
1027 |
char buf[256]; |
1028 |
|
1029 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
1030 |
if (nb_sns <= 0) |
1031 |
return;
|
1032 |
printf("Snapshot list:\n");
|
1033 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
1034 |
for(i = 0; i < nb_sns; i++) { |
1035 |
sn = &sn_tab[i]; |
1036 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
1037 |
} |
1038 |
qemu_free(sn_tab); |
1039 |
} |
1040 |
|
1041 |
static int img_info(int argc, char **argv) |
1042 |
{ |
1043 |
int c;
|
1044 |
const char *filename, *fmt; |
1045 |
BlockDriverState *bs; |
1046 |
char fmt_name[128], size_buf[128], dsize_buf[128]; |
1047 |
uint64_t total_sectors; |
1048 |
int64_t allocated_size; |
1049 |
char backing_filename[1024]; |
1050 |
char backing_filename2[1024]; |
1051 |
BlockDriverInfo bdi; |
1052 |
|
1053 |
fmt = NULL;
|
1054 |
for(;;) {
|
1055 |
c = getopt(argc, argv, "f:h");
|
1056 |
if (c == -1) |
1057 |
break;
|
1058 |
switch(c) {
|
1059 |
case 'h': |
1060 |
help(); |
1061 |
break;
|
1062 |
case 'f': |
1063 |
fmt = optarg; |
1064 |
break;
|
1065 |
} |
1066 |
} |
1067 |
if (optind >= argc)
|
1068 |
help(); |
1069 |
filename = argv[optind++]; |
1070 |
|
1071 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
1072 |
if (!bs) {
|
1073 |
return 1; |
1074 |
} |
1075 |
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
|
1076 |
bdrv_get_geometry(bs, &total_sectors); |
1077 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
1078 |
allocated_size = get_allocated_file_size(filename); |
1079 |
if (allocated_size < 0) |
1080 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
1081 |
else
|
1082 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
1083 |
allocated_size); |
1084 |
printf("image: %s\n"
|
1085 |
"file format: %s\n"
|
1086 |
"virtual size: %s (%" PRId64 " bytes)\n" |
1087 |
"disk size: %s\n",
|
1088 |
filename, fmt_name, size_buf, |
1089 |
(total_sectors * 512),
|
1090 |
dsize_buf); |
1091 |
if (bdrv_is_encrypted(bs))
|
1092 |
printf("encrypted: yes\n");
|
1093 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
1094 |
if (bdi.cluster_size != 0) |
1095 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
1096 |
} |
1097 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
1098 |
if (backing_filename[0] != '\0') { |
1099 |
path_combine(backing_filename2, sizeof(backing_filename2),
|
1100 |
filename, backing_filename); |
1101 |
printf("backing file: %s (actual path: %s)\n",
|
1102 |
backing_filename, |
1103 |
backing_filename2); |
1104 |
} |
1105 |
dump_snapshots(bs); |
1106 |
bdrv_delete(bs); |
1107 |
return 0; |
1108 |
} |
1109 |
|
1110 |
#define SNAPSHOT_LIST 1 |
1111 |
#define SNAPSHOT_CREATE 2 |
1112 |
#define SNAPSHOT_APPLY 3 |
1113 |
#define SNAPSHOT_DELETE 4 |
1114 |
|
1115 |
static int img_snapshot(int argc, char **argv) |
1116 |
{ |
1117 |
BlockDriverState *bs; |
1118 |
QEMUSnapshotInfo sn; |
1119 |
char *filename, *snapshot_name = NULL; |
1120 |
int c, ret = 0, bdrv_oflags; |
1121 |
int action = 0; |
1122 |
qemu_timeval tv; |
1123 |
|
1124 |
bdrv_oflags = BDRV_O_RDWR; |
1125 |
/* Parse commandline parameters */
|
1126 |
for(;;) {
|
1127 |
c = getopt(argc, argv, "la:c:d:h");
|
1128 |
if (c == -1) |
1129 |
break;
|
1130 |
switch(c) {
|
1131 |
case 'h': |
1132 |
help(); |
1133 |
return 0; |
1134 |
case 'l': |
1135 |
if (action) {
|
1136 |
help(); |
1137 |
return 0; |
1138 |
} |
1139 |
action = SNAPSHOT_LIST; |
1140 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
1141 |
break;
|
1142 |
case 'a': |
1143 |
if (action) {
|
1144 |
help(); |
1145 |
return 0; |
1146 |
} |
1147 |
action = SNAPSHOT_APPLY; |
1148 |
snapshot_name = optarg; |
1149 |
break;
|
1150 |
case 'c': |
1151 |
if (action) {
|
1152 |
help(); |
1153 |
return 0; |
1154 |
} |
1155 |
action = SNAPSHOT_CREATE; |
1156 |
snapshot_name = optarg; |
1157 |
break;
|
1158 |
case 'd': |
1159 |
if (action) {
|
1160 |
help(); |
1161 |
return 0; |
1162 |
} |
1163 |
action = SNAPSHOT_DELETE; |
1164 |
snapshot_name = optarg; |
1165 |
break;
|
1166 |
} |
1167 |
} |
1168 |
|
1169 |
if (optind >= argc)
|
1170 |
help(); |
1171 |
filename = argv[optind++]; |
1172 |
|
1173 |
/* Open the image */
|
1174 |
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
|
1175 |
if (!bs) {
|
1176 |
return 1; |
1177 |
} |
1178 |
|
1179 |
/* Perform the requested action */
|
1180 |
switch(action) {
|
1181 |
case SNAPSHOT_LIST:
|
1182 |
dump_snapshots(bs); |
1183 |
break;
|
1184 |
|
1185 |
case SNAPSHOT_CREATE:
|
1186 |
memset(&sn, 0, sizeof(sn)); |
1187 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
1188 |
|
1189 |
qemu_gettimeofday(&tv); |
1190 |
sn.date_sec = tv.tv_sec; |
1191 |
sn.date_nsec = tv.tv_usec * 1000;
|
1192 |
|
1193 |
ret = bdrv_snapshot_create(bs, &sn); |
1194 |
if (ret)
|
1195 |
error("Could not create snapshot '%s': %d (%s)",
|
1196 |
snapshot_name, ret, strerror(-ret)); |
1197 |
break;
|
1198 |
|
1199 |
case SNAPSHOT_APPLY:
|
1200 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
1201 |
if (ret)
|
1202 |
error("Could not apply snapshot '%s': %d (%s)",
|
1203 |
snapshot_name, ret, strerror(-ret)); |
1204 |
break;
|
1205 |
|
1206 |
case SNAPSHOT_DELETE:
|
1207 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
1208 |
if (ret)
|
1209 |
error("Could not delete snapshot '%s': %d (%s)",
|
1210 |
snapshot_name, ret, strerror(-ret)); |
1211 |
break;
|
1212 |
} |
1213 |
|
1214 |
/* Cleanup */
|
1215 |
bdrv_delete(bs); |
1216 |
if (ret) {
|
1217 |
return 1; |
1218 |
} |
1219 |
return 0; |
1220 |
} |
1221 |
|
1222 |
static int img_rebase(int argc, char **argv) |
1223 |
{ |
1224 |
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; |
1225 |
BlockDriver *old_backing_drv, *new_backing_drv; |
1226 |
char *filename;
|
1227 |
const char *fmt, *out_basefmt, *out_baseimg; |
1228 |
int c, flags, ret;
|
1229 |
int unsafe = 0; |
1230 |
|
1231 |
/* Parse commandline parameters */
|
1232 |
fmt = NULL;
|
1233 |
out_baseimg = NULL;
|
1234 |
out_basefmt = NULL;
|
1235 |
|
1236 |
for(;;) {
|
1237 |
c = getopt(argc, argv, "uhf:F:b:");
|
1238 |
if (c == -1) |
1239 |
break;
|
1240 |
switch(c) {
|
1241 |
case 'h': |
1242 |
help(); |
1243 |
return 0; |
1244 |
case 'f': |
1245 |
fmt = optarg; |
1246 |
break;
|
1247 |
case 'F': |
1248 |
out_basefmt = optarg; |
1249 |
break;
|
1250 |
case 'b': |
1251 |
out_baseimg = optarg; |
1252 |
break;
|
1253 |
case 'u': |
1254 |
unsafe = 1;
|
1255 |
break;
|
1256 |
} |
1257 |
} |
1258 |
|
1259 |
if ((optind >= argc) || !out_baseimg)
|
1260 |
help(); |
1261 |
filename = argv[optind++]; |
1262 |
|
1263 |
/*
|
1264 |
* Open the images.
|
1265 |
*
|
1266 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1267 |
* the reference to a renamed or moved backing file.
|
1268 |
*/
|
1269 |
flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1270 |
bs = bdrv_new_open(filename, fmt, flags); |
1271 |
if (!bs) {
|
1272 |
return 1; |
1273 |
} |
1274 |
|
1275 |
/* Find the right drivers for the backing files */
|
1276 |
old_backing_drv = NULL;
|
1277 |
new_backing_drv = NULL;
|
1278 |
|
1279 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1280 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1281 |
if (old_backing_drv == NULL) { |
1282 |
error("Invalid format name: '%s'", bs->backing_format);
|
1283 |
ret = -1;
|
1284 |
goto out;
|
1285 |
} |
1286 |
} |
1287 |
|
1288 |
if (out_basefmt != NULL) { |
1289 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1290 |
if (new_backing_drv == NULL) { |
1291 |
error("Invalid format name: '%s'", out_basefmt);
|
1292 |
ret = -1;
|
1293 |
goto out;
|
1294 |
} |
1295 |
} |
1296 |
|
1297 |
/* For safe rebasing we need to compare old and new backing file */
|
1298 |
if (unsafe) {
|
1299 |
/* Make the compiler happy */
|
1300 |
bs_old_backing = NULL;
|
1301 |
bs_new_backing = NULL;
|
1302 |
} else {
|
1303 |
char backing_name[1024]; |
1304 |
|
1305 |
bs_old_backing = bdrv_new("old_backing");
|
1306 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1307 |
ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, |
1308 |
old_backing_drv); |
1309 |
if (ret) {
|
1310 |
error("Could not open old backing file '%s'", backing_name);
|
1311 |
goto out;
|
1312 |
} |
1313 |
|
1314 |
bs_new_backing = bdrv_new("new_backing");
|
1315 |
ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS, |
1316 |
new_backing_drv); |
1317 |
if (ret) {
|
1318 |
error("Could not open new backing file '%s'", out_baseimg);
|
1319 |
goto out;
|
1320 |
} |
1321 |
} |
1322 |
|
1323 |
/*
|
1324 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1325 |
* accesses go to the backing file. We must therefore compare this cluster
|
1326 |
* in the old and new backing file, and if they differ we need to copy it
|
1327 |
* from the old backing file into the COW file.
|
1328 |
*
|
1329 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1330 |
* the image is the same as the original one at any time.
|
1331 |
*/
|
1332 |
if (!unsafe) {
|
1333 |
uint64_t num_sectors; |
1334 |
uint64_t sector; |
1335 |
int n;
|
1336 |
uint8_t * buf_old; |
1337 |
uint8_t * buf_new; |
1338 |
|
1339 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
1340 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
1341 |
|
1342 |
bdrv_get_geometry(bs, &num_sectors); |
1343 |
|
1344 |
for (sector = 0; sector < num_sectors; sector += n) { |
1345 |
|
1346 |
/* How many sectors can we handle with the next read? */
|
1347 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1348 |
n = (IO_BUF_SIZE / 512);
|
1349 |
} else {
|
1350 |
n = num_sectors - sector; |
1351 |
} |
1352 |
|
1353 |
/* If the cluster is allocated, we don't need to take action */
|
1354 |
ret = bdrv_is_allocated(bs, sector, n, &n); |
1355 |
if (ret) {
|
1356 |
continue;
|
1357 |
} |
1358 |
|
1359 |
/* Read old and new backing file */
|
1360 |
ret = bdrv_read(bs_old_backing, sector, buf_old, n); |
1361 |
if (ret < 0) { |
1362 |
error("error while reading from old backing file");
|
1363 |
goto out;
|
1364 |
} |
1365 |
ret = bdrv_read(bs_new_backing, sector, buf_new, n); |
1366 |
if (ret < 0) { |
1367 |
error("error while reading from new backing file");
|
1368 |
goto out;
|
1369 |
} |
1370 |
|
1371 |
/* If they differ, we need to write to the COW file */
|
1372 |
uint64_t written = 0;
|
1373 |
|
1374 |
while (written < n) {
|
1375 |
int pnum;
|
1376 |
|
1377 |
if (compare_sectors(buf_old + written * 512, |
1378 |
buf_new + written * 512, n - written, &pnum))
|
1379 |
{ |
1380 |
ret = bdrv_write(bs, sector + written, |
1381 |
buf_old + written * 512, pnum);
|
1382 |
if (ret < 0) { |
1383 |
error("Error while writing to COW image: %s",
|
1384 |
strerror(-ret)); |
1385 |
goto out;
|
1386 |
} |
1387 |
} |
1388 |
|
1389 |
written += pnum; |
1390 |
} |
1391 |
} |
1392 |
|
1393 |
qemu_free(buf_old); |
1394 |
qemu_free(buf_new); |
1395 |
} |
1396 |
|
1397 |
/*
|
1398 |
* Change the backing file. All clusters that are different from the old
|
1399 |
* backing file are overwritten in the COW file now, so the visible content
|
1400 |
* doesn't change when we switch the backing file.
|
1401 |
*/
|
1402 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1403 |
if (ret == -ENOSPC) {
|
1404 |
error("Could not change the backing file to '%s': No space left in "
|
1405 |
"the file header", out_baseimg);
|
1406 |
} else if (ret < 0) { |
1407 |
error("Could not change the backing file to '%s': %s",
|
1408 |
out_baseimg, strerror(-ret)); |
1409 |
} |
1410 |
|
1411 |
/*
|
1412 |
* TODO At this point it is possible to check if any clusters that are
|
1413 |
* allocated in the COW file are the same in the backing file. If so, they
|
1414 |
* could be dropped from the COW file. Don't do this before switching the
|
1415 |
* backing file, in case of a crash this would lead to corruption.
|
1416 |
*/
|
1417 |
out:
|
1418 |
/* Cleanup */
|
1419 |
if (!unsafe) {
|
1420 |
bdrv_delete(bs_old_backing); |
1421 |
bdrv_delete(bs_new_backing); |
1422 |
} |
1423 |
|
1424 |
bdrv_delete(bs); |
1425 |
if (ret) {
|
1426 |
return 1; |
1427 |
} |
1428 |
return 0; |
1429 |
} |
1430 |
|
1431 |
static int img_resize(int argc, char **argv) |
1432 |
{ |
1433 |
int c, ret, relative;
|
1434 |
const char *filename, *fmt, *size; |
1435 |
int64_t n, total_size; |
1436 |
BlockDriverState *bs; |
1437 |
QEMUOptionParameter *param; |
1438 |
QEMUOptionParameter resize_options[] = { |
1439 |
{ |
1440 |
.name = BLOCK_OPT_SIZE, |
1441 |
.type = OPT_SIZE, |
1442 |
.help = "Virtual disk size"
|
1443 |
}, |
1444 |
{ NULL }
|
1445 |
}; |
1446 |
|
1447 |
fmt = NULL;
|
1448 |
for(;;) {
|
1449 |
c = getopt(argc, argv, "f:h");
|
1450 |
if (c == -1) { |
1451 |
break;
|
1452 |
} |
1453 |
switch(c) {
|
1454 |
case 'h': |
1455 |
help(); |
1456 |
break;
|
1457 |
case 'f': |
1458 |
fmt = optarg; |
1459 |
break;
|
1460 |
} |
1461 |
} |
1462 |
if (optind + 1 >= argc) { |
1463 |
help(); |
1464 |
} |
1465 |
filename = argv[optind++]; |
1466 |
size = argv[optind++]; |
1467 |
|
1468 |
/* Choose grow, shrink, or absolute resize mode */
|
1469 |
switch (size[0]) { |
1470 |
case '+': |
1471 |
relative = 1;
|
1472 |
size++; |
1473 |
break;
|
1474 |
case '-': |
1475 |
relative = -1;
|
1476 |
size++; |
1477 |
break;
|
1478 |
default:
|
1479 |
relative = 0;
|
1480 |
break;
|
1481 |
} |
1482 |
|
1483 |
/* Parse size */
|
1484 |
param = parse_option_parameters("", resize_options, NULL); |
1485 |
if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
|
1486 |
/* Error message already printed when size parsing fails */
|
1487 |
exit(1);
|
1488 |
} |
1489 |
n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; |
1490 |
free_option_parameters(param); |
1491 |
|
1492 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
1493 |
if (!bs) {
|
1494 |
return 1; |
1495 |
} |
1496 |
|
1497 |
if (relative) {
|
1498 |
total_size = bdrv_getlength(bs) + n * relative; |
1499 |
} else {
|
1500 |
total_size = n; |
1501 |
} |
1502 |
if (total_size <= 0) { |
1503 |
error("New image size must be positive");
|
1504 |
ret = -1;
|
1505 |
goto out;
|
1506 |
} |
1507 |
|
1508 |
ret = bdrv_truncate(bs, total_size); |
1509 |
switch (ret) {
|
1510 |
case 0: |
1511 |
printf("Image resized.\n");
|
1512 |
break;
|
1513 |
case -ENOTSUP:
|
1514 |
error("This image format does not support resize");
|
1515 |
break;
|
1516 |
case -EACCES:
|
1517 |
error("Image is read-only");
|
1518 |
break;
|
1519 |
default:
|
1520 |
error("Error resizing image (%d)", -ret);
|
1521 |
break;
|
1522 |
} |
1523 |
out:
|
1524 |
bdrv_delete(bs); |
1525 |
if (ret) {
|
1526 |
return 1; |
1527 |
} |
1528 |
return 0; |
1529 |
} |
1530 |
|
1531 |
static const img_cmd_t img_cmds[] = { |
1532 |
#define DEF(option, callback, arg_string) \
|
1533 |
{ option, callback }, |
1534 |
#include "qemu-img-cmds.h" |
1535 |
#undef DEF
|
1536 |
#undef GEN_DOCS
|
1537 |
{ NULL, NULL, }, |
1538 |
}; |
1539 |
|
1540 |
int main(int argc, char **argv) |
1541 |
{ |
1542 |
const img_cmd_t *cmd;
|
1543 |
const char *cmdname; |
1544 |
|
1545 |
bdrv_init(); |
1546 |
if (argc < 2) |
1547 |
help(); |
1548 |
cmdname = argv[1];
|
1549 |
argc--; argv++; |
1550 |
|
1551 |
/* find the command */
|
1552 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1553 |
if (!strcmp(cmdname, cmd->name)) {
|
1554 |
return cmd->handler(argc, argv);
|
1555 |
} |
1556 |
} |
1557 |
|
1558 |
/* not found */
|
1559 |
help(); |
1560 |
return 0; |
1561 |
} |