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/*
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---|---|
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 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 "vl.h" |
25 |
#include "block_int.h" |
26 |
|
27 |
#ifdef _BSD
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#include <sys/types.h> |
29 |
#include <sys/stat.h> |
30 |
#include <sys/ioctl.h> |
31 |
#include <sys/queue.h> |
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#include <sys/disk.h> |
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#endif
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|
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#define SECTOR_BITS 9 |
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#define SECTOR_SIZE (1 << SECTOR_BITS) |
37 |
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typedef struct BlockDriverAIOCBSync { |
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BlockDriverAIOCB common; |
40 |
QEMUBH *bh; |
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int ret;
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} BlockDriverAIOCBSync; |
43 |
|
44 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
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int64_t sector_num, const uint8_t *buf, int nb_sectors, |
49 |
BlockDriverCompletionFunc *cb, void *opaque);
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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
51 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
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uint8_t *buf, int nb_sectors);
|
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static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
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const uint8_t *buf, int nb_sectors); |
55 |
|
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static BlockDriverState *bdrv_first;
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static BlockDriver *first_drv;
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58 |
|
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#ifdef _WIN32
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#define PATH_SEP '\\' |
61 |
#else
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#define PATH_SEP '/' |
63 |
#endif
|
64 |
|
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int path_is_absolute(const char *path) |
66 |
{ |
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const char *p; |
68 |
p = strchr(path, ':');
|
69 |
if (p)
|
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p++; |
71 |
else
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p = path; |
73 |
return (*p == PATH_SEP);
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} |
75 |
|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
|
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path to it by considering it is relative to base_path. URL are
|
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supported. */
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
82 |
{ |
83 |
const char *p, *p1; |
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int len;
|
85 |
|
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if (dest_size <= 0) |
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return;
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if (path_is_absolute(filename)) {
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pstrcpy(dest, dest_size, filename); |
90 |
} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
94 |
else
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p = base_path; |
96 |
p1 = strrchr(base_path, PATH_SEP); |
97 |
if (p1)
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p1++; |
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else
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p1 = base_path; |
101 |
if (p1 > p)
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p = p1; |
103 |
len = p - base_path; |
104 |
if (len > dest_size - 1) |
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len = dest_size - 1;
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memcpy(dest, base_path, len); |
107 |
dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
109 |
} |
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} |
111 |
|
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|
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void bdrv_register(BlockDriver *bdrv)
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{ |
115 |
if (!bdrv->bdrv_aio_read) {
|
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/* add AIO emulation layer */
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bdrv->bdrv_aio_read = bdrv_aio_read_em; |
118 |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
119 |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
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bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
|
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} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
122 |
/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
124 |
bdrv->bdrv_write = bdrv_write_em; |
125 |
} |
126 |
bdrv->next = first_drv; |
127 |
first_drv = bdrv; |
128 |
} |
129 |
|
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/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name) |
132 |
{ |
133 |
BlockDriverState **pbs, *bs; |
134 |
|
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bs = qemu_mallocz(sizeof(BlockDriverState));
|
136 |
if(!bs)
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return NULL; |
138 |
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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139 |
if (device_name[0] != '\0') { |
140 |
/* insert at the end */
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141 |
pbs = &bdrv_first; |
142 |
while (*pbs != NULL) |
143 |
pbs = &(*pbs)->next; |
144 |
*pbs = bs; |
145 |
} |
146 |
return bs;
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147 |
} |
148 |
|
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BlockDriver *bdrv_find_format(const char *format_name) |
150 |
{ |
151 |
BlockDriver *drv1; |
152 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
153 |
if (!strcmp(drv1->format_name, format_name))
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return drv1;
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} |
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return NULL; |
157 |
} |
158 |
|
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int bdrv_create(BlockDriver *drv,
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const char *filename, int64_t size_in_sectors, |
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const char *backing_file, int flags) |
162 |
{ |
163 |
if (!drv->bdrv_create)
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return -ENOTSUP;
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return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
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} |
167 |
|
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
170 |
{ |
171 |
tmpnam(filename); |
172 |
} |
173 |
#else
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void get_tmp_filename(char *filename, int size) |
175 |
{ |
176 |
int fd;
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/* XXX: race condition possible */
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pstrcpy(filename, size, "/tmp/vl.XXXXXX");
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fd = mkstemp(filename); |
180 |
close(fd); |
181 |
} |
182 |
#endif
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183 |
|
184 |
#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
186 |
{ |
187 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
188 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
189 |
filename[1] == ':'); |
190 |
} |
191 |
|
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static int is_windows_drive(const char *filename) |
193 |
{ |
194 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
196 |
return 1; |
197 |
if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
199 |
return 1; |
200 |
return 0; |
201 |
} |
202 |
#endif
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203 |
|
204 |
static BlockDriver *find_protocol(const char *filename) |
205 |
{ |
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BlockDriver *drv1; |
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char protocol[128]; |
208 |
int len;
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const char *p; |
210 |
|
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#ifdef _WIN32
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if (is_windows_drive(filename) ||
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is_windows_drive_prefix(filename)) |
214 |
return &bdrv_raw;
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#endif
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216 |
p = strchr(filename, ':');
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217 |
if (!p)
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return &bdrv_raw;
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219 |
len = p - filename; |
220 |
if (len > sizeof(protocol) - 1) |
221 |
len = sizeof(protocol) - 1; |
222 |
memcpy(protocol, filename, len); |
223 |
protocol[len] = '\0';
|
224 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
225 |
if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) |
227 |
return drv1;
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228 |
} |
229 |
return NULL; |
230 |
} |
231 |
|
232 |
/* XXX: force raw format if block or character device ? It would
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simplify the BSD case */
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static BlockDriver *find_image_format(const char *filename) |
235 |
{ |
236 |
int ret, score, score_max;
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BlockDriver *drv1, *drv; |
238 |
uint8_t buf[2048];
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BlockDriverState *bs; |
240 |
|
241 |
/* detect host devices. By convention, /dev/cdrom[N] is always
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242 |
recognized as a host CDROM */
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243 |
if (strstart(filename, "/dev/cdrom", NULL)) |
244 |
return &bdrv_host_device;
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245 |
#ifdef _WIN32
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246 |
if (is_windows_drive(filename))
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247 |
return &bdrv_host_device;
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248 |
#else
|
249 |
{ |
250 |
struct stat st;
|
251 |
if (stat(filename, &st) >= 0 && |
252 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
253 |
return &bdrv_host_device;
|
254 |
} |
255 |
} |
256 |
#endif
|
257 |
|
258 |
drv = find_protocol(filename); |
259 |
/* no need to test disk image formats for vvfat */
|
260 |
if (drv == &bdrv_vvfat)
|
261 |
return drv;
|
262 |
|
263 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
264 |
if (ret < 0) |
265 |
return NULL; |
266 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
267 |
bdrv_delete(bs); |
268 |
if (ret < 0) { |
269 |
return NULL; |
270 |
} |
271 |
|
272 |
score_max = 0;
|
273 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
274 |
if (drv1->bdrv_probe) {
|
275 |
score = drv1->bdrv_probe(buf, ret, filename); |
276 |
if (score > score_max) {
|
277 |
score_max = score; |
278 |
drv = drv1; |
279 |
} |
280 |
} |
281 |
} |
282 |
return drv;
|
283 |
} |
284 |
|
285 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
286 |
{ |
287 |
BlockDriverState *bs; |
288 |
int ret;
|
289 |
|
290 |
bs = bdrv_new("");
|
291 |
if (!bs)
|
292 |
return -ENOMEM;
|
293 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
294 |
if (ret < 0) { |
295 |
bdrv_delete(bs); |
296 |
return ret;
|
297 |
} |
298 |
*pbs = bs; |
299 |
return 0; |
300 |
} |
301 |
|
302 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
303 |
{ |
304 |
return bdrv_open2(bs, filename, flags, NULL); |
305 |
} |
306 |
|
307 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
308 |
BlockDriver *drv) |
309 |
{ |
310 |
int ret, open_flags;
|
311 |
char tmp_filename[1024]; |
312 |
char backing_filename[1024]; |
313 |
|
314 |
bs->read_only = 0;
|
315 |
bs->is_temporary = 0;
|
316 |
bs->encrypted = 0;
|
317 |
|
318 |
if (flags & BDRV_O_SNAPSHOT) {
|
319 |
BlockDriverState *bs1; |
320 |
int64_t total_size; |
321 |
|
322 |
/* if snapshot, we create a temporary backing file and open it
|
323 |
instead of opening 'filename' directly */
|
324 |
|
325 |
/* if there is a backing file, use it */
|
326 |
bs1 = bdrv_new("");
|
327 |
if (!bs1) {
|
328 |
return -ENOMEM;
|
329 |
} |
330 |
if (bdrv_open(bs1, filename, 0) < 0) { |
331 |
bdrv_delete(bs1); |
332 |
return -1; |
333 |
} |
334 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
335 |
bdrv_delete(bs1); |
336 |
|
337 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
338 |
realpath(filename, backing_filename); |
339 |
if (bdrv_create(&bdrv_qcow2, tmp_filename,
|
340 |
total_size, backing_filename, 0) < 0) { |
341 |
return -1; |
342 |
} |
343 |
filename = tmp_filename; |
344 |
bs->is_temporary = 1;
|
345 |
} |
346 |
|
347 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
348 |
if (flags & BDRV_O_FILE) {
|
349 |
drv = find_protocol(filename); |
350 |
if (!drv)
|
351 |
return -ENOENT;
|
352 |
} else {
|
353 |
if (!drv) {
|
354 |
drv = find_image_format(filename); |
355 |
if (!drv)
|
356 |
return -1; |
357 |
} |
358 |
} |
359 |
bs->drv = drv; |
360 |
bs->opaque = qemu_mallocz(drv->instance_size); |
361 |
if (bs->opaque == NULL && drv->instance_size > 0) |
362 |
return -1; |
363 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
364 |
RDONLY as fallback */
|
365 |
if (!(flags & BDRV_O_FILE))
|
366 |
open_flags = BDRV_O_RDWR; |
367 |
else
|
368 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
369 |
ret = drv->bdrv_open(bs, filename, open_flags); |
370 |
if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
|
371 |
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
372 |
bs->read_only = 1;
|
373 |
} |
374 |
if (ret < 0) { |
375 |
qemu_free(bs->opaque); |
376 |
bs->opaque = NULL;
|
377 |
bs->drv = NULL;
|
378 |
return ret;
|
379 |
} |
380 |
if (drv->bdrv_getlength) {
|
381 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
382 |
} |
383 |
#ifndef _WIN32
|
384 |
if (bs->is_temporary) {
|
385 |
unlink(filename); |
386 |
} |
387 |
#endif
|
388 |
if (bs->backing_file[0] != '\0') { |
389 |
/* if there is a backing file, use it */
|
390 |
bs->backing_hd = bdrv_new("");
|
391 |
if (!bs->backing_hd) {
|
392 |
fail:
|
393 |
bdrv_close(bs); |
394 |
return -ENOMEM;
|
395 |
} |
396 |
path_combine(backing_filename, sizeof(backing_filename),
|
397 |
filename, bs->backing_file); |
398 |
if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
399 |
goto fail;
|
400 |
} |
401 |
|
402 |
/* call the change callback */
|
403 |
bs->media_changed = 1;
|
404 |
if (bs->change_cb)
|
405 |
bs->change_cb(bs->change_opaque); |
406 |
|
407 |
return 0; |
408 |
} |
409 |
|
410 |
void bdrv_close(BlockDriverState *bs)
|
411 |
{ |
412 |
if (bs->drv) {
|
413 |
if (bs->backing_hd)
|
414 |
bdrv_delete(bs->backing_hd); |
415 |
bs->drv->bdrv_close(bs); |
416 |
qemu_free(bs->opaque); |
417 |
#ifdef _WIN32
|
418 |
if (bs->is_temporary) {
|
419 |
unlink(bs->filename); |
420 |
} |
421 |
#endif
|
422 |
bs->opaque = NULL;
|
423 |
bs->drv = NULL;
|
424 |
|
425 |
/* call the change callback */
|
426 |
bs->media_changed = 1;
|
427 |
if (bs->change_cb)
|
428 |
bs->change_cb(bs->change_opaque); |
429 |
} |
430 |
} |
431 |
|
432 |
void bdrv_delete(BlockDriverState *bs)
|
433 |
{ |
434 |
/* XXX: remove the driver list */
|
435 |
bdrv_close(bs); |
436 |
qemu_free(bs); |
437 |
} |
438 |
|
439 |
/* commit COW file into the raw image */
|
440 |
int bdrv_commit(BlockDriverState *bs)
|
441 |
{ |
442 |
BlockDriver *drv = bs->drv; |
443 |
int64_t i, total_sectors; |
444 |
int n, j;
|
445 |
unsigned char sector[512]; |
446 |
|
447 |
if (!drv)
|
448 |
return -ENOMEDIUM;
|
449 |
|
450 |
if (bs->read_only) {
|
451 |
return -EACCES;
|
452 |
} |
453 |
|
454 |
if (!bs->backing_hd) {
|
455 |
return -ENOTSUP;
|
456 |
} |
457 |
|
458 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
459 |
for (i = 0; i < total_sectors;) { |
460 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
461 |
for(j = 0; j < n; j++) { |
462 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
463 |
return -EIO;
|
464 |
} |
465 |
|
466 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
467 |
return -EIO;
|
468 |
} |
469 |
i++; |
470 |
} |
471 |
} else {
|
472 |
i += n; |
473 |
} |
474 |
} |
475 |
|
476 |
if (drv->bdrv_make_empty)
|
477 |
return drv->bdrv_make_empty(bs);
|
478 |
|
479 |
return 0; |
480 |
} |
481 |
|
482 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
483 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
484 |
uint8_t *buf, int nb_sectors)
|
485 |
{ |
486 |
BlockDriver *drv = bs->drv; |
487 |
|
488 |
if (!drv)
|
489 |
return -ENOMEDIUM;
|
490 |
|
491 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
492 |
memcpy(buf, bs->boot_sector_data, 512);
|
493 |
sector_num++; |
494 |
nb_sectors--; |
495 |
buf += 512;
|
496 |
if (nb_sectors == 0) |
497 |
return 0; |
498 |
} |
499 |
if (drv->bdrv_pread) {
|
500 |
int ret, len;
|
501 |
len = nb_sectors * 512;
|
502 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
503 |
if (ret < 0) |
504 |
return ret;
|
505 |
else if (ret != len) |
506 |
return -EINVAL;
|
507 |
else
|
508 |
return 0; |
509 |
} else {
|
510 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
511 |
} |
512 |
} |
513 |
|
514 |
/* Return < 0 if error. Important errors are:
|
515 |
-EIO generic I/O error (may happen for all errors)
|
516 |
-ENOMEDIUM No media inserted.
|
517 |
-EINVAL Invalid sector number or nb_sectors
|
518 |
-EACCES Trying to write a read-only device
|
519 |
*/
|
520 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
521 |
const uint8_t *buf, int nb_sectors) |
522 |
{ |
523 |
BlockDriver *drv = bs->drv; |
524 |
if (!bs->drv)
|
525 |
return -ENOMEDIUM;
|
526 |
if (bs->read_only)
|
527 |
return -EACCES;
|
528 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
529 |
memcpy(bs->boot_sector_data, buf, 512);
|
530 |
} |
531 |
if (drv->bdrv_pwrite) {
|
532 |
int ret, len;
|
533 |
len = nb_sectors * 512;
|
534 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
|
535 |
if (ret < 0) |
536 |
return ret;
|
537 |
else if (ret != len) |
538 |
return -EIO;
|
539 |
else
|
540 |
return 0; |
541 |
} else {
|
542 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
543 |
} |
544 |
} |
545 |
|
546 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
547 |
uint8_t *buf, int count1)
|
548 |
{ |
549 |
uint8_t tmp_buf[SECTOR_SIZE]; |
550 |
int len, nb_sectors, count;
|
551 |
int64_t sector_num; |
552 |
|
553 |
count = count1; |
554 |
/* first read to align to sector start */
|
555 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
556 |
if (len > count)
|
557 |
len = count; |
558 |
sector_num = offset >> SECTOR_BITS; |
559 |
if (len > 0) { |
560 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
561 |
return -EIO;
|
562 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
563 |
count -= len; |
564 |
if (count == 0) |
565 |
return count1;
|
566 |
sector_num++; |
567 |
buf += len; |
568 |
} |
569 |
|
570 |
/* read the sectors "in place" */
|
571 |
nb_sectors = count >> SECTOR_BITS; |
572 |
if (nb_sectors > 0) { |
573 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
574 |
return -EIO;
|
575 |
sector_num += nb_sectors; |
576 |
len = nb_sectors << SECTOR_BITS; |
577 |
buf += len; |
578 |
count -= len; |
579 |
} |
580 |
|
581 |
/* add data from the last sector */
|
582 |
if (count > 0) { |
583 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
584 |
return -EIO;
|
585 |
memcpy(buf, tmp_buf, count); |
586 |
} |
587 |
return count1;
|
588 |
} |
589 |
|
590 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
591 |
const uint8_t *buf, int count1) |
592 |
{ |
593 |
uint8_t tmp_buf[SECTOR_SIZE]; |
594 |
int len, nb_sectors, count;
|
595 |
int64_t sector_num; |
596 |
|
597 |
count = count1; |
598 |
/* first write to align to sector start */
|
599 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
600 |
if (len > count)
|
601 |
len = count; |
602 |
sector_num = offset >> SECTOR_BITS; |
603 |
if (len > 0) { |
604 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
605 |
return -EIO;
|
606 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
607 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
608 |
return -EIO;
|
609 |
count -= len; |
610 |
if (count == 0) |
611 |
return count1;
|
612 |
sector_num++; |
613 |
buf += len; |
614 |
} |
615 |
|
616 |
/* write the sectors "in place" */
|
617 |
nb_sectors = count >> SECTOR_BITS; |
618 |
if (nb_sectors > 0) { |
619 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
620 |
return -EIO;
|
621 |
sector_num += nb_sectors; |
622 |
len = nb_sectors << SECTOR_BITS; |
623 |
buf += len; |
624 |
count -= len; |
625 |
} |
626 |
|
627 |
/* add data from the last sector */
|
628 |
if (count > 0) { |
629 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
630 |
return -EIO;
|
631 |
memcpy(tmp_buf, buf, count); |
632 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
633 |
return -EIO;
|
634 |
} |
635 |
return count1;
|
636 |
} |
637 |
|
638 |
/**
|
639 |
* Read with byte offsets (needed only for file protocols)
|
640 |
*/
|
641 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
642 |
void *buf1, int count1) |
643 |
{ |
644 |
BlockDriver *drv = bs->drv; |
645 |
|
646 |
if (!drv)
|
647 |
return -ENOMEDIUM;
|
648 |
if (!drv->bdrv_pread)
|
649 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
650 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
651 |
} |
652 |
|
653 |
/**
|
654 |
* Write with byte offsets (needed only for file protocols)
|
655 |
*/
|
656 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
657 |
const void *buf1, int count1) |
658 |
{ |
659 |
BlockDriver *drv = bs->drv; |
660 |
|
661 |
if (!drv)
|
662 |
return -ENOMEDIUM;
|
663 |
if (!drv->bdrv_pwrite)
|
664 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
665 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
666 |
} |
667 |
|
668 |
/**
|
669 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
670 |
*/
|
671 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
672 |
{ |
673 |
BlockDriver *drv = bs->drv; |
674 |
if (!drv)
|
675 |
return -ENOMEDIUM;
|
676 |
if (!drv->bdrv_truncate)
|
677 |
return -ENOTSUP;
|
678 |
return drv->bdrv_truncate(bs, offset);
|
679 |
} |
680 |
|
681 |
/**
|
682 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
683 |
*/
|
684 |
int64_t bdrv_getlength(BlockDriverState *bs) |
685 |
{ |
686 |
BlockDriver *drv = bs->drv; |
687 |
if (!drv)
|
688 |
return -ENOMEDIUM;
|
689 |
if (!drv->bdrv_getlength) {
|
690 |
/* legacy mode */
|
691 |
return bs->total_sectors * SECTOR_SIZE;
|
692 |
} |
693 |
return drv->bdrv_getlength(bs);
|
694 |
} |
695 |
|
696 |
/* return 0 as number of sectors if no device present or error */
|
697 |
void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
|
698 |
{ |
699 |
int64_t length; |
700 |
length = bdrv_getlength(bs); |
701 |
if (length < 0) |
702 |
length = 0;
|
703 |
else
|
704 |
length = length >> SECTOR_BITS; |
705 |
*nb_sectors_ptr = length; |
706 |
} |
707 |
|
708 |
/* force a given boot sector. */
|
709 |
void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) |
710 |
{ |
711 |
bs->boot_sector_enabled = 1;
|
712 |
if (size > 512) |
713 |
size = 512;
|
714 |
memcpy(bs->boot_sector_data, data, size); |
715 |
memset(bs->boot_sector_data + size, 0, 512 - size); |
716 |
} |
717 |
|
718 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
719 |
int cyls, int heads, int secs) |
720 |
{ |
721 |
bs->cyls = cyls; |
722 |
bs->heads = heads; |
723 |
bs->secs = secs; |
724 |
} |
725 |
|
726 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
727 |
{ |
728 |
bs->type = type; |
729 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
730 |
type == BDRV_TYPE_FLOPPY)); |
731 |
} |
732 |
|
733 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
734 |
{ |
735 |
bs->translation = translation; |
736 |
} |
737 |
|
738 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
739 |
int *pcyls, int *pheads, int *psecs) |
740 |
{ |
741 |
*pcyls = bs->cyls; |
742 |
*pheads = bs->heads; |
743 |
*psecs = bs->secs; |
744 |
} |
745 |
|
746 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
747 |
{ |
748 |
return bs->type;
|
749 |
} |
750 |
|
751 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
752 |
{ |
753 |
return bs->translation;
|
754 |
} |
755 |
|
756 |
int bdrv_is_removable(BlockDriverState *bs)
|
757 |
{ |
758 |
return bs->removable;
|
759 |
} |
760 |
|
761 |
int bdrv_is_read_only(BlockDriverState *bs)
|
762 |
{ |
763 |
return bs->read_only;
|
764 |
} |
765 |
|
766 |
/* XXX: no longer used */
|
767 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
768 |
void (*change_cb)(void *opaque), void *opaque) |
769 |
{ |
770 |
bs->change_cb = change_cb; |
771 |
bs->change_opaque = opaque; |
772 |
} |
773 |
|
774 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
775 |
{ |
776 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
777 |
return 1; |
778 |
return bs->encrypted;
|
779 |
} |
780 |
|
781 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
782 |
{ |
783 |
int ret;
|
784 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
785 |
ret = bdrv_set_key(bs->backing_hd, key); |
786 |
if (ret < 0) |
787 |
return ret;
|
788 |
if (!bs->encrypted)
|
789 |
return 0; |
790 |
} |
791 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
792 |
return -1; |
793 |
return bs->drv->bdrv_set_key(bs, key);
|
794 |
} |
795 |
|
796 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
797 |
{ |
798 |
if (!bs->drv) {
|
799 |
buf[0] = '\0'; |
800 |
} else {
|
801 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
802 |
} |
803 |
} |
804 |
|
805 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
806 |
void *opaque)
|
807 |
{ |
808 |
BlockDriver *drv; |
809 |
|
810 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
811 |
it(opaque, drv->format_name); |
812 |
} |
813 |
} |
814 |
|
815 |
BlockDriverState *bdrv_find(const char *name) |
816 |
{ |
817 |
BlockDriverState *bs; |
818 |
|
819 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
820 |
if (!strcmp(name, bs->device_name))
|
821 |
return bs;
|
822 |
} |
823 |
return NULL; |
824 |
} |
825 |
|
826 |
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
827 |
{ |
828 |
BlockDriverState *bs; |
829 |
|
830 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
831 |
it(opaque, bs->device_name); |
832 |
} |
833 |
} |
834 |
|
835 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
836 |
{ |
837 |
return bs->device_name;
|
838 |
} |
839 |
|
840 |
void bdrv_flush(BlockDriverState *bs)
|
841 |
{ |
842 |
if (bs->drv->bdrv_flush)
|
843 |
bs->drv->bdrv_flush(bs); |
844 |
if (bs->backing_hd)
|
845 |
bdrv_flush(bs->backing_hd); |
846 |
} |
847 |
|
848 |
void bdrv_info(void) |
849 |
{ |
850 |
BlockDriverState *bs; |
851 |
|
852 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
853 |
term_printf("%s:", bs->device_name);
|
854 |
term_printf(" type=");
|
855 |
switch(bs->type) {
|
856 |
case BDRV_TYPE_HD:
|
857 |
term_printf("hd");
|
858 |
break;
|
859 |
case BDRV_TYPE_CDROM:
|
860 |
term_printf("cdrom");
|
861 |
break;
|
862 |
case BDRV_TYPE_FLOPPY:
|
863 |
term_printf("floppy");
|
864 |
break;
|
865 |
} |
866 |
term_printf(" removable=%d", bs->removable);
|
867 |
if (bs->removable) {
|
868 |
term_printf(" locked=%d", bs->locked);
|
869 |
} |
870 |
if (bs->drv) {
|
871 |
term_printf(" file=%s", bs->filename);
|
872 |
if (bs->backing_file[0] != '\0') |
873 |
term_printf(" backing_file=%s", bs->backing_file);
|
874 |
term_printf(" ro=%d", bs->read_only);
|
875 |
term_printf(" drv=%s", bs->drv->format_name);
|
876 |
if (bs->encrypted)
|
877 |
term_printf(" encrypted");
|
878 |
} else {
|
879 |
term_printf(" [not inserted]");
|
880 |
} |
881 |
term_printf("\n");
|
882 |
} |
883 |
} |
884 |
|
885 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
886 |
char *filename, int filename_size) |
887 |
{ |
888 |
if (!bs->backing_hd) {
|
889 |
pstrcpy(filename, filename_size, "");
|
890 |
} else {
|
891 |
pstrcpy(filename, filename_size, bs->backing_file); |
892 |
} |
893 |
} |
894 |
|
895 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
896 |
const uint8_t *buf, int nb_sectors) |
897 |
{ |
898 |
BlockDriver *drv = bs->drv; |
899 |
if (!drv)
|
900 |
return -ENOMEDIUM;
|
901 |
if (!drv->bdrv_write_compressed)
|
902 |
return -ENOTSUP;
|
903 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
904 |
} |
905 |
|
906 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
907 |
{ |
908 |
BlockDriver *drv = bs->drv; |
909 |
if (!drv)
|
910 |
return -ENOMEDIUM;
|
911 |
if (!drv->bdrv_get_info)
|
912 |
return -ENOTSUP;
|
913 |
memset(bdi, 0, sizeof(*bdi)); |
914 |
return drv->bdrv_get_info(bs, bdi);
|
915 |
} |
916 |
|
917 |
/**************************************************************/
|
918 |
/* handling of snapshots */
|
919 |
|
920 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
921 |
QEMUSnapshotInfo *sn_info) |
922 |
{ |
923 |
BlockDriver *drv = bs->drv; |
924 |
if (!drv)
|
925 |
return -ENOMEDIUM;
|
926 |
if (!drv->bdrv_snapshot_create)
|
927 |
return -ENOTSUP;
|
928 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
929 |
} |
930 |
|
931 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
932 |
const char *snapshot_id) |
933 |
{ |
934 |
BlockDriver *drv = bs->drv; |
935 |
if (!drv)
|
936 |
return -ENOMEDIUM;
|
937 |
if (!drv->bdrv_snapshot_goto)
|
938 |
return -ENOTSUP;
|
939 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
940 |
} |
941 |
|
942 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
943 |
{ |
944 |
BlockDriver *drv = bs->drv; |
945 |
if (!drv)
|
946 |
return -ENOMEDIUM;
|
947 |
if (!drv->bdrv_snapshot_delete)
|
948 |
return -ENOTSUP;
|
949 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
950 |
} |
951 |
|
952 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
953 |
QEMUSnapshotInfo **psn_info) |
954 |
{ |
955 |
BlockDriver *drv = bs->drv; |
956 |
if (!drv)
|
957 |
return -ENOMEDIUM;
|
958 |
if (!drv->bdrv_snapshot_list)
|
959 |
return -ENOTSUP;
|
960 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
961 |
} |
962 |
|
963 |
#define NB_SUFFIXES 4 |
964 |
|
965 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
966 |
{ |
967 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
968 |
int64_t base; |
969 |
int i;
|
970 |
|
971 |
if (size <= 999) { |
972 |
snprintf(buf, buf_size, "%" PRId64, size);
|
973 |
} else {
|
974 |
base = 1024;
|
975 |
for(i = 0; i < NB_SUFFIXES; i++) { |
976 |
if (size < (10 * base)) { |
977 |
snprintf(buf, buf_size, "%0.1f%c",
|
978 |
(double)size / base,
|
979 |
suffixes[i]); |
980 |
break;
|
981 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
982 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
983 |
((size + (base >> 1)) / base),
|
984 |
suffixes[i]); |
985 |
break;
|
986 |
} |
987 |
base = base * 1024;
|
988 |
} |
989 |
} |
990 |
return buf;
|
991 |
} |
992 |
|
993 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
994 |
{ |
995 |
char buf1[128], date_buf[128], clock_buf[128]; |
996 |
struct tm tm;
|
997 |
time_t ti; |
998 |
int64_t secs; |
999 |
|
1000 |
if (!sn) {
|
1001 |
snprintf(buf, buf_size, |
1002 |
"%-10s%-20s%7s%20s%15s",
|
1003 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1004 |
} else {
|
1005 |
ti = sn->date_sec; |
1006 |
#ifndef _WIN32
|
1007 |
localtime_r(&ti, &tm); |
1008 |
#endif
|
1009 |
strftime(date_buf, sizeof(date_buf),
|
1010 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1011 |
secs = sn->vm_clock_nsec / 1000000000;
|
1012 |
snprintf(clock_buf, sizeof(clock_buf),
|
1013 |
"%02d:%02d:%02d.%03d",
|
1014 |
(int)(secs / 3600), |
1015 |
(int)((secs / 60) % 60), |
1016 |
(int)(secs % 60), |
1017 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1018 |
snprintf(buf, buf_size, |
1019 |
"%-10s%-20s%7s%20s%15s",
|
1020 |
sn->id_str, sn->name, |
1021 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1022 |
date_buf, |
1023 |
clock_buf); |
1024 |
} |
1025 |
return buf;
|
1026 |
} |
1027 |
|
1028 |
|
1029 |
/**************************************************************/
|
1030 |
/* async I/Os */
|
1031 |
|
1032 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1033 |
uint8_t *buf, int nb_sectors,
|
1034 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1035 |
{ |
1036 |
BlockDriver *drv = bs->drv; |
1037 |
|
1038 |
if (!drv)
|
1039 |
return NULL; |
1040 |
|
1041 |
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
|
1042 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
1043 |
memcpy(buf, bs->boot_sector_data, 512);
|
1044 |
sector_num++; |
1045 |
nb_sectors--; |
1046 |
buf += 512;
|
1047 |
} |
1048 |
|
1049 |
return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
|
1050 |
} |
1051 |
|
1052 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1053 |
const uint8_t *buf, int nb_sectors, |
1054 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1055 |
{ |
1056 |
BlockDriver *drv = bs->drv; |
1057 |
|
1058 |
if (!drv)
|
1059 |
return NULL; |
1060 |
if (bs->read_only)
|
1061 |
return NULL; |
1062 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
1063 |
memcpy(bs->boot_sector_data, buf, 512);
|
1064 |
} |
1065 |
|
1066 |
return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
|
1067 |
} |
1068 |
|
1069 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1070 |
{ |
1071 |
BlockDriver *drv = acb->bs->drv; |
1072 |
|
1073 |
drv->bdrv_aio_cancel(acb); |
1074 |
} |
1075 |
|
1076 |
|
1077 |
/**************************************************************/
|
1078 |
/* async block device emulation */
|
1079 |
|
1080 |
#ifdef QEMU_TOOL
|
1081 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1082 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1083 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1084 |
{ |
1085 |
int ret;
|
1086 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1087 |
cb(opaque, ret); |
1088 |
return NULL; |
1089 |
} |
1090 |
|
1091 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1092 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1093 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1094 |
{ |
1095 |
int ret;
|
1096 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1097 |
cb(opaque, ret); |
1098 |
return NULL; |
1099 |
} |
1100 |
|
1101 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
1102 |
{ |
1103 |
} |
1104 |
#else
|
1105 |
static void bdrv_aio_bh_cb(void *opaque) |
1106 |
{ |
1107 |
BlockDriverAIOCBSync *acb = opaque; |
1108 |
acb->common.cb(acb->common.opaque, acb->ret); |
1109 |
qemu_aio_release(acb); |
1110 |
} |
1111 |
|
1112 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1113 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1114 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1115 |
{ |
1116 |
BlockDriverAIOCBSync *acb; |
1117 |
int ret;
|
1118 |
|
1119 |
acb = qemu_aio_get(bs, cb, opaque); |
1120 |
if (!acb->bh)
|
1121 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1122 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1123 |
acb->ret = ret; |
1124 |
qemu_bh_schedule(acb->bh); |
1125 |
return &acb->common;
|
1126 |
} |
1127 |
|
1128 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1129 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1130 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1131 |
{ |
1132 |
BlockDriverAIOCBSync *acb; |
1133 |
int ret;
|
1134 |
|
1135 |
acb = qemu_aio_get(bs, cb, opaque); |
1136 |
if (!acb->bh)
|
1137 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1138 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1139 |
acb->ret = ret; |
1140 |
qemu_bh_schedule(acb->bh); |
1141 |
return &acb->common;
|
1142 |
} |
1143 |
|
1144 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1145 |
{ |
1146 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1147 |
qemu_bh_cancel(acb->bh); |
1148 |
qemu_aio_release(acb); |
1149 |
} |
1150 |
#endif /* !QEMU_TOOL */ |
1151 |
|
1152 |
/**************************************************************/
|
1153 |
/* sync block device emulation */
|
1154 |
|
1155 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1156 |
{ |
1157 |
*(int *)opaque = ret;
|
1158 |
} |
1159 |
|
1160 |
#define NOT_DONE 0x7fffffff |
1161 |
|
1162 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1163 |
uint8_t *buf, int nb_sectors)
|
1164 |
{ |
1165 |
int async_ret;
|
1166 |
BlockDriverAIOCB *acb; |
1167 |
|
1168 |
async_ret = NOT_DONE; |
1169 |
qemu_aio_wait_start(); |
1170 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
1171 |
bdrv_rw_em_cb, &async_ret); |
1172 |
if (acb == NULL) { |
1173 |
qemu_aio_wait_end(); |
1174 |
return -1; |
1175 |
} |
1176 |
while (async_ret == NOT_DONE) {
|
1177 |
qemu_aio_wait(); |
1178 |
} |
1179 |
qemu_aio_wait_end(); |
1180 |
return async_ret;
|
1181 |
} |
1182 |
|
1183 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1184 |
const uint8_t *buf, int nb_sectors) |
1185 |
{ |
1186 |
int async_ret;
|
1187 |
BlockDriverAIOCB *acb; |
1188 |
|
1189 |
async_ret = NOT_DONE; |
1190 |
qemu_aio_wait_start(); |
1191 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
1192 |
bdrv_rw_em_cb, &async_ret); |
1193 |
if (acb == NULL) { |
1194 |
qemu_aio_wait_end(); |
1195 |
return -1; |
1196 |
} |
1197 |
while (async_ret == NOT_DONE) {
|
1198 |
qemu_aio_wait(); |
1199 |
} |
1200 |
qemu_aio_wait_end(); |
1201 |
return async_ret;
|
1202 |
} |
1203 |
|
1204 |
void bdrv_init(void) |
1205 |
{ |
1206 |
bdrv_register(&bdrv_raw); |
1207 |
bdrv_register(&bdrv_host_device); |
1208 |
#ifndef _WIN32
|
1209 |
bdrv_register(&bdrv_cow); |
1210 |
#endif
|
1211 |
bdrv_register(&bdrv_qcow); |
1212 |
bdrv_register(&bdrv_vmdk); |
1213 |
bdrv_register(&bdrv_cloop); |
1214 |
bdrv_register(&bdrv_dmg); |
1215 |
bdrv_register(&bdrv_bochs); |
1216 |
bdrv_register(&bdrv_vpc); |
1217 |
bdrv_register(&bdrv_vvfat); |
1218 |
bdrv_register(&bdrv_qcow2); |
1219 |
} |
1220 |
|
1221 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
1222 |
void *opaque)
|
1223 |
{ |
1224 |
BlockDriver *drv; |
1225 |
BlockDriverAIOCB *acb; |
1226 |
|
1227 |
drv = bs->drv; |
1228 |
if (drv->free_aiocb) {
|
1229 |
acb = drv->free_aiocb; |
1230 |
drv->free_aiocb = acb->next; |
1231 |
} else {
|
1232 |
acb = qemu_mallocz(drv->aiocb_size); |
1233 |
if (!acb)
|
1234 |
return NULL; |
1235 |
} |
1236 |
acb->bs = bs; |
1237 |
acb->cb = cb; |
1238 |
acb->opaque = opaque; |
1239 |
return acb;
|
1240 |
} |
1241 |
|
1242 |
void qemu_aio_release(void *p) |
1243 |
{ |
1244 |
BlockDriverAIOCB *acb = p; |
1245 |
BlockDriver *drv = acb->bs->drv; |
1246 |
acb->next = drv->free_aiocb; |
1247 |
drv->free_aiocb = acb; |
1248 |
} |
1249 |
|
1250 |
/**************************************************************/
|
1251 |
/* removable device support */
|
1252 |
|
1253 |
/**
|
1254 |
* Return TRUE if the media is present
|
1255 |
*/
|
1256 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1257 |
{ |
1258 |
BlockDriver *drv = bs->drv; |
1259 |
int ret;
|
1260 |
if (!drv)
|
1261 |
return 0; |
1262 |
if (!drv->bdrv_is_inserted)
|
1263 |
return 1; |
1264 |
ret = drv->bdrv_is_inserted(bs); |
1265 |
return ret;
|
1266 |
} |
1267 |
|
1268 |
/**
|
1269 |
* Return TRUE if the media changed since the last call to this
|
1270 |
* function. It is currently only used for floppy disks
|
1271 |
*/
|
1272 |
int bdrv_media_changed(BlockDriverState *bs)
|
1273 |
{ |
1274 |
BlockDriver *drv = bs->drv; |
1275 |
int ret;
|
1276 |
|
1277 |
if (!drv || !drv->bdrv_media_changed)
|
1278 |
ret = -ENOTSUP; |
1279 |
else
|
1280 |
ret = drv->bdrv_media_changed(bs); |
1281 |
if (ret == -ENOTSUP)
|
1282 |
ret = bs->media_changed; |
1283 |
bs->media_changed = 0;
|
1284 |
return ret;
|
1285 |
} |
1286 |
|
1287 |
/**
|
1288 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1289 |
*/
|
1290 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
1291 |
{ |
1292 |
BlockDriver *drv = bs->drv; |
1293 |
int ret;
|
1294 |
|
1295 |
if (!drv || !drv->bdrv_eject) {
|
1296 |
ret = -ENOTSUP; |
1297 |
} else {
|
1298 |
ret = drv->bdrv_eject(bs, eject_flag); |
1299 |
} |
1300 |
if (ret == -ENOTSUP) {
|
1301 |
if (eject_flag)
|
1302 |
bdrv_close(bs); |
1303 |
} |
1304 |
} |
1305 |
|
1306 |
int bdrv_is_locked(BlockDriverState *bs)
|
1307 |
{ |
1308 |
return bs->locked;
|
1309 |
} |
1310 |
|
1311 |
/**
|
1312 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1313 |
* to eject it manually).
|
1314 |
*/
|
1315 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1316 |
{ |
1317 |
BlockDriver *drv = bs->drv; |
1318 |
|
1319 |
bs->locked = locked; |
1320 |
if (drv && drv->bdrv_set_locked) {
|
1321 |
drv->bdrv_set_locked(bs, locked); |
1322 |
} |
1323 |
} |