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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 "config-host.h" |
25 |
#include "qemu-common.h" |
26 |
#include "monitor.h" |
27 |
#include "block_int.h" |
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#include "module.h" |
29 |
|
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#ifdef CONFIG_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/ioctl.h> |
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#include <sys/queue.h> |
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#ifndef __DragonFly__
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#include <sys/disk.h> |
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#endif
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#endif
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|
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#ifdef _WIN32
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#include <windows.h> |
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#endif
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|
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static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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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); |
56 |
|
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BlockDriverState *bdrv_first; |
58 |
|
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static BlockDriver *first_drv;
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60 |
|
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/* If non-zero, use only whitelisted block drivers */
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static int use_bdrv_whitelist; |
63 |
|
64 |
int path_is_absolute(const char *path) |
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{ |
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const char *p; |
67 |
#ifdef _WIN32
|
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/* specific case for names like: "\\.\d:" */
|
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if (*path == '/' || *path == '\\') |
70 |
return 1; |
71 |
#endif
|
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p = strchr(path, ':');
|
73 |
if (p)
|
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p++; |
75 |
else
|
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p = path; |
77 |
#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
79 |
#else
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return (*p == '/'); |
81 |
#endif
|
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} |
83 |
|
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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) |
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{ |
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const char *p, *p1; |
92 |
int len;
|
93 |
|
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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); |
98 |
} else {
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p = strchr(base_path, ':');
|
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if (p)
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p++; |
102 |
else
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p = base_path; |
104 |
p1 = strrchr(base_path, '/');
|
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#ifdef _WIN32
|
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{ |
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const char *p2; |
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p2 = strrchr(base_path, '\\');
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if (!p1 || p2 > p1)
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p1 = p2; |
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} |
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#endif
|
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if (p1)
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p1++; |
115 |
else
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p1 = base_path; |
117 |
if (p1 > p)
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p = p1; |
119 |
len = p - base_path; |
120 |
if (len > dest_size - 1) |
121 |
len = dest_size - 1;
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memcpy(dest, base_path, len); |
123 |
dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
125 |
} |
126 |
} |
127 |
|
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void bdrv_register(BlockDriver *bdrv)
|
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{ |
130 |
if (!bdrv->bdrv_aio_readv) {
|
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/* add AIO emulation layer */
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
133 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
134 |
} else if (!bdrv->bdrv_read) { |
135 |
/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
137 |
bdrv->bdrv_write = bdrv_write_em; |
138 |
} |
139 |
|
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if (!bdrv->bdrv_aio_flush)
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
142 |
|
143 |
bdrv->next = first_drv; |
144 |
first_drv = bdrv; |
145 |
} |
146 |
|
147 |
/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name) |
149 |
{ |
150 |
BlockDriverState **pbs, *bs; |
151 |
|
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bs = qemu_mallocz(sizeof(BlockDriverState));
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pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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if (device_name[0] != '\0') { |
155 |
/* insert at the end */
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pbs = &bdrv_first; |
157 |
while (*pbs != NULL) |
158 |
pbs = &(*pbs)->next; |
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*pbs = bs; |
160 |
} |
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return bs;
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} |
163 |
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BlockDriver *bdrv_find_format(const char *format_name) |
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{ |
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BlockDriver *drv1; |
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
168 |
if (!strcmp(drv1->format_name, format_name))
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return drv1;
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} |
171 |
return NULL; |
172 |
} |
173 |
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static int bdrv_is_whitelisted(BlockDriver *drv) |
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{ |
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static const char *whitelist[] = { |
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CONFIG_BDRV_WHITELIST |
178 |
}; |
179 |
const char **p; |
180 |
|
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
183 |
|
184 |
for (p = whitelist; *p; p++) {
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if (!strcmp(drv->format_name, *p)) {
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return 1; |
187 |
} |
188 |
} |
189 |
return 0; |
190 |
} |
191 |
|
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
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{ |
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BlockDriver *drv = bdrv_find_format(format_name); |
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return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
196 |
} |
197 |
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
200 |
{ |
201 |
if (!drv->bdrv_create)
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return -ENOTSUP;
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203 |
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return drv->bdrv_create(filename, options);
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} |
206 |
|
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
209 |
{ |
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char temp_dir[MAX_PATH];
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GetTempPath(MAX_PATH, temp_dir); |
213 |
GetTempFileName(temp_dir, "qem", 0, filename); |
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} |
215 |
#else
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void get_tmp_filename(char *filename, int size) |
217 |
{ |
218 |
int fd;
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const char *tmpdir; |
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/* XXX: race condition possible */
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tmpdir = getenv("TMPDIR");
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if (!tmpdir)
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tmpdir = "/tmp";
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snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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fd = mkstemp(filename); |
226 |
close(fd); |
227 |
} |
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#endif
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229 |
|
230 |
#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
232 |
{ |
233 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
236 |
} |
237 |
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int is_windows_drive(const char *filename) |
239 |
{ |
240 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
242 |
return 1; |
243 |
if (strstart(filename, "\\\\.\\", NULL) || |
244 |
strstart(filename, "//./", NULL)) |
245 |
return 1; |
246 |
return 0; |
247 |
} |
248 |
#endif
|
249 |
|
250 |
static BlockDriver *find_protocol(const char *filename) |
251 |
{ |
252 |
BlockDriver *drv1; |
253 |
char protocol[128]; |
254 |
int len;
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const char *p; |
256 |
|
257 |
#ifdef _WIN32
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258 |
if (is_windows_drive(filename) ||
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259 |
is_windows_drive_prefix(filename)) |
260 |
return bdrv_find_format("raw"); |
261 |
#endif
|
262 |
p = strchr(filename, ':');
|
263 |
if (!p)
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264 |
return bdrv_find_format("raw"); |
265 |
len = p - filename; |
266 |
if (len > sizeof(protocol) - 1) |
267 |
len = sizeof(protocol) - 1; |
268 |
memcpy(protocol, filename, len); |
269 |
protocol[len] = '\0';
|
270 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
271 |
if (drv1->protocol_name &&
|
272 |
!strcmp(drv1->protocol_name, protocol)) |
273 |
return drv1;
|
274 |
} |
275 |
return NULL; |
276 |
} |
277 |
|
278 |
/*
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279 |
* Detect host devices. By convention, /dev/cdrom[N] is always
|
280 |
* recognized as a host CDROM.
|
281 |
*/
|
282 |
static BlockDriver *find_hdev_driver(const char *filename) |
283 |
{ |
284 |
int score_max = 0, score; |
285 |
BlockDriver *drv = NULL, *d;
|
286 |
|
287 |
for (d = first_drv; d; d = d->next) {
|
288 |
if (d->bdrv_probe_device) {
|
289 |
score = d->bdrv_probe_device(filename); |
290 |
if (score > score_max) {
|
291 |
score_max = score; |
292 |
drv = d; |
293 |
} |
294 |
} |
295 |
} |
296 |
|
297 |
return drv;
|
298 |
} |
299 |
|
300 |
static BlockDriver *find_image_format(const char *filename) |
301 |
{ |
302 |
int ret, score, score_max;
|
303 |
BlockDriver *drv1, *drv; |
304 |
uint8_t buf[2048];
|
305 |
BlockDriverState *bs; |
306 |
|
307 |
drv = find_protocol(filename); |
308 |
/* no need to test disk image formats for vvfat */
|
309 |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
310 |
return drv;
|
311 |
|
312 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
313 |
if (ret < 0) |
314 |
return NULL; |
315 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
316 |
bdrv_delete(bs); |
317 |
if (ret < 0) { |
318 |
return NULL; |
319 |
} |
320 |
|
321 |
score_max = 0;
|
322 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
323 |
if (drv1->bdrv_probe) {
|
324 |
score = drv1->bdrv_probe(buf, ret, filename); |
325 |
if (score > score_max) {
|
326 |
score_max = score; |
327 |
drv = drv1; |
328 |
} |
329 |
} |
330 |
} |
331 |
return drv;
|
332 |
} |
333 |
|
334 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
335 |
{ |
336 |
BlockDriverState *bs; |
337 |
int ret;
|
338 |
|
339 |
bs = bdrv_new("");
|
340 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
341 |
if (ret < 0) { |
342 |
bdrv_delete(bs); |
343 |
return ret;
|
344 |
} |
345 |
bs->growable = 1;
|
346 |
*pbs = bs; |
347 |
return 0; |
348 |
} |
349 |
|
350 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
351 |
{ |
352 |
return bdrv_open2(bs, filename, flags, NULL); |
353 |
} |
354 |
|
355 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
356 |
BlockDriver *drv) |
357 |
{ |
358 |
int ret, open_flags, try_rw;
|
359 |
char tmp_filename[PATH_MAX];
|
360 |
char backing_filename[PATH_MAX];
|
361 |
|
362 |
bs->is_temporary = 0;
|
363 |
bs->encrypted = 0;
|
364 |
bs->valid_key = 0;
|
365 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
366 |
bs->buffer_alignment = 512;
|
367 |
|
368 |
if (flags & BDRV_O_SNAPSHOT) {
|
369 |
BlockDriverState *bs1; |
370 |
int64_t total_size; |
371 |
int is_protocol = 0; |
372 |
BlockDriver *bdrv_qcow2; |
373 |
QEMUOptionParameter *options; |
374 |
|
375 |
/* if snapshot, we create a temporary backing file and open it
|
376 |
instead of opening 'filename' directly */
|
377 |
|
378 |
/* if there is a backing file, use it */
|
379 |
bs1 = bdrv_new("");
|
380 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
381 |
if (ret < 0) { |
382 |
bdrv_delete(bs1); |
383 |
return ret;
|
384 |
} |
385 |
total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
386 |
|
387 |
if (bs1->drv && bs1->drv->protocol_name)
|
388 |
is_protocol = 1;
|
389 |
|
390 |
bdrv_delete(bs1); |
391 |
|
392 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
393 |
|
394 |
/* Real path is meaningless for protocols */
|
395 |
if (is_protocol)
|
396 |
snprintf(backing_filename, sizeof(backing_filename),
|
397 |
"%s", filename);
|
398 |
else
|
399 |
realpath(filename, backing_filename); |
400 |
|
401 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
402 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
403 |
|
404 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
405 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
406 |
if (drv) {
|
407 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
408 |
drv->format_name); |
409 |
} |
410 |
|
411 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
412 |
if (ret < 0) { |
413 |
return ret;
|
414 |
} |
415 |
|
416 |
filename = tmp_filename; |
417 |
drv = bdrv_qcow2; |
418 |
bs->is_temporary = 1;
|
419 |
} |
420 |
|
421 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
422 |
if (flags & BDRV_O_FILE) {
|
423 |
drv = find_protocol(filename); |
424 |
} else if (!drv) { |
425 |
drv = find_hdev_driver(filename); |
426 |
if (!drv) {
|
427 |
drv = find_image_format(filename); |
428 |
} |
429 |
} |
430 |
if (!drv) {
|
431 |
ret = -ENOENT; |
432 |
goto unlink_and_fail;
|
433 |
} |
434 |
bs->drv = drv; |
435 |
bs->opaque = qemu_mallocz(drv->instance_size); |
436 |
|
437 |
/*
|
438 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
439 |
* write cache to the guest. We do need the fdatasync to flush
|
440 |
* out transactions for block allocations, and we maybe have a
|
441 |
* volatile write cache in our backing device to deal with.
|
442 |
*/
|
443 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
444 |
bs->enable_write_cache = 1;
|
445 |
|
446 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
447 |
RDONLY as fallback */
|
448 |
try_rw = !bs->read_only || bs->is_temporary; |
449 |
if (!(flags & BDRV_O_FILE))
|
450 |
open_flags = (try_rw ? BDRV_O_RDWR : 0) |
|
451 |
(flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
452 |
else
|
453 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
454 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv))
|
455 |
ret = -ENOTSUP; |
456 |
else
|
457 |
ret = drv->bdrv_open(bs, filename, open_flags); |
458 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
459 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
460 |
bs->read_only = 1;
|
461 |
} |
462 |
if (ret < 0) { |
463 |
qemu_free(bs->opaque); |
464 |
bs->opaque = NULL;
|
465 |
bs->drv = NULL;
|
466 |
unlink_and_fail:
|
467 |
if (bs->is_temporary)
|
468 |
unlink(filename); |
469 |
return ret;
|
470 |
} |
471 |
if (drv->bdrv_getlength) {
|
472 |
bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
473 |
} |
474 |
#ifndef _WIN32
|
475 |
if (bs->is_temporary) {
|
476 |
unlink(filename); |
477 |
} |
478 |
#endif
|
479 |
if (bs->backing_file[0] != '\0') { |
480 |
/* if there is a backing file, use it */
|
481 |
BlockDriver *back_drv = NULL;
|
482 |
bs->backing_hd = bdrv_new("");
|
483 |
/* pass on read_only property to the backing_hd */
|
484 |
bs->backing_hd->read_only = bs->read_only; |
485 |
path_combine(backing_filename, sizeof(backing_filename),
|
486 |
filename, bs->backing_file); |
487 |
if (bs->backing_format[0] != '\0') |
488 |
back_drv = bdrv_find_format(bs->backing_format); |
489 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
490 |
back_drv); |
491 |
if (ret < 0) { |
492 |
bdrv_close(bs); |
493 |
return ret;
|
494 |
} |
495 |
} |
496 |
|
497 |
if (!bdrv_key_required(bs)) {
|
498 |
/* call the change callback */
|
499 |
bs->media_changed = 1;
|
500 |
if (bs->change_cb)
|
501 |
bs->change_cb(bs->change_opaque); |
502 |
} |
503 |
return 0; |
504 |
} |
505 |
|
506 |
void bdrv_close(BlockDriverState *bs)
|
507 |
{ |
508 |
if (bs->drv) {
|
509 |
if (bs->backing_hd)
|
510 |
bdrv_delete(bs->backing_hd); |
511 |
bs->drv->bdrv_close(bs); |
512 |
qemu_free(bs->opaque); |
513 |
#ifdef _WIN32
|
514 |
if (bs->is_temporary) {
|
515 |
unlink(bs->filename); |
516 |
} |
517 |
#endif
|
518 |
bs->opaque = NULL;
|
519 |
bs->drv = NULL;
|
520 |
|
521 |
/* call the change callback */
|
522 |
bs->media_changed = 1;
|
523 |
if (bs->change_cb)
|
524 |
bs->change_cb(bs->change_opaque); |
525 |
} |
526 |
} |
527 |
|
528 |
void bdrv_delete(BlockDriverState *bs)
|
529 |
{ |
530 |
BlockDriverState **pbs; |
531 |
|
532 |
pbs = &bdrv_first; |
533 |
while (*pbs != bs && *pbs != NULL) |
534 |
pbs = &(*pbs)->next; |
535 |
if (*pbs == bs)
|
536 |
*pbs = bs->next; |
537 |
|
538 |
bdrv_close(bs); |
539 |
qemu_free(bs); |
540 |
} |
541 |
|
542 |
/*
|
543 |
* Run consistency checks on an image
|
544 |
*
|
545 |
* Returns the number of errors or -errno when an internal error occurs
|
546 |
*/
|
547 |
int bdrv_check(BlockDriverState *bs)
|
548 |
{ |
549 |
if (bs->drv->bdrv_check == NULL) { |
550 |
return -ENOTSUP;
|
551 |
} |
552 |
|
553 |
return bs->drv->bdrv_check(bs);
|
554 |
} |
555 |
|
556 |
/* commit COW file into the raw image */
|
557 |
int bdrv_commit(BlockDriverState *bs)
|
558 |
{ |
559 |
BlockDriver *drv = bs->drv; |
560 |
int64_t i, total_sectors; |
561 |
int n, j;
|
562 |
unsigned char sector[512]; |
563 |
|
564 |
if (!drv)
|
565 |
return -ENOMEDIUM;
|
566 |
|
567 |
if (bs->read_only) {
|
568 |
return -EACCES;
|
569 |
} |
570 |
|
571 |
if (!bs->backing_hd) {
|
572 |
return -ENOTSUP;
|
573 |
} |
574 |
|
575 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
576 |
for (i = 0; i < total_sectors;) { |
577 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
578 |
for(j = 0; j < n; j++) { |
579 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
580 |
return -EIO;
|
581 |
} |
582 |
|
583 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
584 |
return -EIO;
|
585 |
} |
586 |
i++; |
587 |
} |
588 |
} else {
|
589 |
i += n; |
590 |
} |
591 |
} |
592 |
|
593 |
if (drv->bdrv_make_empty)
|
594 |
return drv->bdrv_make_empty(bs);
|
595 |
|
596 |
return 0; |
597 |
} |
598 |
|
599 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
600 |
size_t size) |
601 |
{ |
602 |
int64_t len; |
603 |
|
604 |
if (!bdrv_is_inserted(bs))
|
605 |
return -ENOMEDIUM;
|
606 |
|
607 |
if (bs->growable)
|
608 |
return 0; |
609 |
|
610 |
len = bdrv_getlength(bs); |
611 |
|
612 |
if (offset < 0) |
613 |
return -EIO;
|
614 |
|
615 |
if ((offset > len) || (len - offset < size))
|
616 |
return -EIO;
|
617 |
|
618 |
return 0; |
619 |
} |
620 |
|
621 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
622 |
int nb_sectors)
|
623 |
{ |
624 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
625 |
} |
626 |
|
627 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
628 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
629 |
uint8_t *buf, int nb_sectors)
|
630 |
{ |
631 |
BlockDriver *drv = bs->drv; |
632 |
|
633 |
if (!drv)
|
634 |
return -ENOMEDIUM;
|
635 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
636 |
return -EIO;
|
637 |
|
638 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
639 |
} |
640 |
|
641 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
642 |
int nb_sectors, int dirty) |
643 |
{ |
644 |
int64_t start, end; |
645 |
unsigned long val, idx, bit; |
646 |
|
647 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
648 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
649 |
|
650 |
for (; start <= end; start++) {
|
651 |
idx = start / (sizeof(unsigned long) * 8); |
652 |
bit = start % (sizeof(unsigned long) * 8); |
653 |
val = bs->dirty_bitmap[idx]; |
654 |
if (dirty) {
|
655 |
val |= 1 << bit;
|
656 |
} else {
|
657 |
val &= ~(1 << bit);
|
658 |
} |
659 |
bs->dirty_bitmap[idx] = val; |
660 |
} |
661 |
} |
662 |
|
663 |
/* Return < 0 if error. Important errors are:
|
664 |
-EIO generic I/O error (may happen for all errors)
|
665 |
-ENOMEDIUM No media inserted.
|
666 |
-EINVAL Invalid sector number or nb_sectors
|
667 |
-EACCES Trying to write a read-only device
|
668 |
*/
|
669 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
670 |
const uint8_t *buf, int nb_sectors) |
671 |
{ |
672 |
BlockDriver *drv = bs->drv; |
673 |
if (!bs->drv)
|
674 |
return -ENOMEDIUM;
|
675 |
if (bs->read_only)
|
676 |
return -EACCES;
|
677 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
678 |
return -EIO;
|
679 |
|
680 |
if (bs->dirty_bitmap) {
|
681 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
682 |
} |
683 |
|
684 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
685 |
} |
686 |
|
687 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
688 |
void *buf, int count1) |
689 |
{ |
690 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
691 |
int len, nb_sectors, count;
|
692 |
int64_t sector_num; |
693 |
|
694 |
count = count1; |
695 |
/* first read to align to sector start */
|
696 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
697 |
if (len > count)
|
698 |
len = count; |
699 |
sector_num = offset >> BDRV_SECTOR_BITS; |
700 |
if (len > 0) { |
701 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
702 |
return -EIO;
|
703 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
704 |
count -= len; |
705 |
if (count == 0) |
706 |
return count1;
|
707 |
sector_num++; |
708 |
buf += len; |
709 |
} |
710 |
|
711 |
/* read the sectors "in place" */
|
712 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
713 |
if (nb_sectors > 0) { |
714 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
715 |
return -EIO;
|
716 |
sector_num += nb_sectors; |
717 |
len = nb_sectors << BDRV_SECTOR_BITS; |
718 |
buf += len; |
719 |
count -= len; |
720 |
} |
721 |
|
722 |
/* add data from the last sector */
|
723 |
if (count > 0) { |
724 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
725 |
return -EIO;
|
726 |
memcpy(buf, tmp_buf, count); |
727 |
} |
728 |
return count1;
|
729 |
} |
730 |
|
731 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
732 |
const void *buf, int count1) |
733 |
{ |
734 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
735 |
int len, nb_sectors, count;
|
736 |
int64_t sector_num; |
737 |
|
738 |
count = count1; |
739 |
/* first write to align to sector start */
|
740 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
741 |
if (len > count)
|
742 |
len = count; |
743 |
sector_num = offset >> BDRV_SECTOR_BITS; |
744 |
if (len > 0) { |
745 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
746 |
return -EIO;
|
747 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
748 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
749 |
return -EIO;
|
750 |
count -= len; |
751 |
if (count == 0) |
752 |
return count1;
|
753 |
sector_num++; |
754 |
buf += len; |
755 |
} |
756 |
|
757 |
/* write the sectors "in place" */
|
758 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
759 |
if (nb_sectors > 0) { |
760 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
761 |
return -EIO;
|
762 |
sector_num += nb_sectors; |
763 |
len = nb_sectors << BDRV_SECTOR_BITS; |
764 |
buf += len; |
765 |
count -= len; |
766 |
} |
767 |
|
768 |
/* add data from the last sector */
|
769 |
if (count > 0) { |
770 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
771 |
return -EIO;
|
772 |
memcpy(tmp_buf, buf, count); |
773 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
774 |
return -EIO;
|
775 |
} |
776 |
return count1;
|
777 |
} |
778 |
|
779 |
/**
|
780 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
781 |
*/
|
782 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
783 |
{ |
784 |
BlockDriver *drv = bs->drv; |
785 |
if (!drv)
|
786 |
return -ENOMEDIUM;
|
787 |
if (!drv->bdrv_truncate)
|
788 |
return -ENOTSUP;
|
789 |
if (bs->read_only)
|
790 |
return -EACCES;
|
791 |
return drv->bdrv_truncate(bs, offset);
|
792 |
} |
793 |
|
794 |
/**
|
795 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
796 |
*/
|
797 |
int64_t bdrv_getlength(BlockDriverState *bs) |
798 |
{ |
799 |
BlockDriver *drv = bs->drv; |
800 |
if (!drv)
|
801 |
return -ENOMEDIUM;
|
802 |
if (!drv->bdrv_getlength) {
|
803 |
/* legacy mode */
|
804 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
805 |
} |
806 |
return drv->bdrv_getlength(bs);
|
807 |
} |
808 |
|
809 |
/* return 0 as number of sectors if no device present or error */
|
810 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
811 |
{ |
812 |
int64_t length; |
813 |
length = bdrv_getlength(bs); |
814 |
if (length < 0) |
815 |
length = 0;
|
816 |
else
|
817 |
length = length >> BDRV_SECTOR_BITS; |
818 |
*nb_sectors_ptr = length; |
819 |
} |
820 |
|
821 |
struct partition {
|
822 |
uint8_t boot_ind; /* 0x80 - active */
|
823 |
uint8_t head; /* starting head */
|
824 |
uint8_t sector; /* starting sector */
|
825 |
uint8_t cyl; /* starting cylinder */
|
826 |
uint8_t sys_ind; /* What partition type */
|
827 |
uint8_t end_head; /* end head */
|
828 |
uint8_t end_sector; /* end sector */
|
829 |
uint8_t end_cyl; /* end cylinder */
|
830 |
uint32_t start_sect; /* starting sector counting from 0 */
|
831 |
uint32_t nr_sects; /* nr of sectors in partition */
|
832 |
} __attribute__((packed)); |
833 |
|
834 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
835 |
static int guess_disk_lchs(BlockDriverState *bs, |
836 |
int *pcylinders, int *pheads, int *psectors) |
837 |
{ |
838 |
uint8_t buf[512];
|
839 |
int ret, i, heads, sectors, cylinders;
|
840 |
struct partition *p;
|
841 |
uint32_t nr_sects; |
842 |
uint64_t nb_sectors; |
843 |
|
844 |
bdrv_get_geometry(bs, &nb_sectors); |
845 |
|
846 |
ret = bdrv_read(bs, 0, buf, 1); |
847 |
if (ret < 0) |
848 |
return -1; |
849 |
/* test msdos magic */
|
850 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
851 |
return -1; |
852 |
for(i = 0; i < 4; i++) { |
853 |
p = ((struct partition *)(buf + 0x1be)) + i; |
854 |
nr_sects = le32_to_cpu(p->nr_sects); |
855 |
if (nr_sects && p->end_head) {
|
856 |
/* We make the assumption that the partition terminates on
|
857 |
a cylinder boundary */
|
858 |
heads = p->end_head + 1;
|
859 |
sectors = p->end_sector & 63;
|
860 |
if (sectors == 0) |
861 |
continue;
|
862 |
cylinders = nb_sectors / (heads * sectors); |
863 |
if (cylinders < 1 || cylinders > 16383) |
864 |
continue;
|
865 |
*pheads = heads; |
866 |
*psectors = sectors; |
867 |
*pcylinders = cylinders; |
868 |
#if 0
|
869 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
870 |
cylinders, heads, sectors);
|
871 |
#endif
|
872 |
return 0; |
873 |
} |
874 |
} |
875 |
return -1; |
876 |
} |
877 |
|
878 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
879 |
{ |
880 |
int translation, lba_detected = 0; |
881 |
int cylinders, heads, secs;
|
882 |
uint64_t nb_sectors; |
883 |
|
884 |
/* if a geometry hint is available, use it */
|
885 |
bdrv_get_geometry(bs, &nb_sectors); |
886 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
887 |
translation = bdrv_get_translation_hint(bs); |
888 |
if (cylinders != 0) { |
889 |
*pcyls = cylinders; |
890 |
*pheads = heads; |
891 |
*psecs = secs; |
892 |
} else {
|
893 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
894 |
if (heads > 16) { |
895 |
/* if heads > 16, it means that a BIOS LBA
|
896 |
translation was active, so the default
|
897 |
hardware geometry is OK */
|
898 |
lba_detected = 1;
|
899 |
goto default_geometry;
|
900 |
} else {
|
901 |
*pcyls = cylinders; |
902 |
*pheads = heads; |
903 |
*psecs = secs; |
904 |
/* disable any translation to be in sync with
|
905 |
the logical geometry */
|
906 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
907 |
bdrv_set_translation_hint(bs, |
908 |
BIOS_ATA_TRANSLATION_NONE); |
909 |
} |
910 |
} |
911 |
} else {
|
912 |
default_geometry:
|
913 |
/* if no geometry, use a standard physical disk geometry */
|
914 |
cylinders = nb_sectors / (16 * 63); |
915 |
|
916 |
if (cylinders > 16383) |
917 |
cylinders = 16383;
|
918 |
else if (cylinders < 2) |
919 |
cylinders = 2;
|
920 |
*pcyls = cylinders; |
921 |
*pheads = 16;
|
922 |
*psecs = 63;
|
923 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
924 |
if ((*pcyls * *pheads) <= 131072) { |
925 |
bdrv_set_translation_hint(bs, |
926 |
BIOS_ATA_TRANSLATION_LARGE); |
927 |
} else {
|
928 |
bdrv_set_translation_hint(bs, |
929 |
BIOS_ATA_TRANSLATION_LBA); |
930 |
} |
931 |
} |
932 |
} |
933 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
934 |
} |
935 |
} |
936 |
|
937 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
938 |
int cyls, int heads, int secs) |
939 |
{ |
940 |
bs->cyls = cyls; |
941 |
bs->heads = heads; |
942 |
bs->secs = secs; |
943 |
} |
944 |
|
945 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
946 |
{ |
947 |
bs->type = type; |
948 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
949 |
type == BDRV_TYPE_FLOPPY)); |
950 |
} |
951 |
|
952 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
953 |
{ |
954 |
bs->translation = translation; |
955 |
} |
956 |
|
957 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
958 |
int *pcyls, int *pheads, int *psecs) |
959 |
{ |
960 |
*pcyls = bs->cyls; |
961 |
*pheads = bs->heads; |
962 |
*psecs = bs->secs; |
963 |
} |
964 |
|
965 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
966 |
{ |
967 |
return bs->type;
|
968 |
} |
969 |
|
970 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
971 |
{ |
972 |
return bs->translation;
|
973 |
} |
974 |
|
975 |
int bdrv_is_removable(BlockDriverState *bs)
|
976 |
{ |
977 |
return bs->removable;
|
978 |
} |
979 |
|
980 |
int bdrv_is_read_only(BlockDriverState *bs)
|
981 |
{ |
982 |
return bs->read_only;
|
983 |
} |
984 |
|
985 |
int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
986 |
{ |
987 |
int ret = bs->read_only;
|
988 |
bs->read_only = read_only; |
989 |
return ret;
|
990 |
} |
991 |
|
992 |
int bdrv_is_sg(BlockDriverState *bs)
|
993 |
{ |
994 |
return bs->sg;
|
995 |
} |
996 |
|
997 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
998 |
{ |
999 |
return bs->enable_write_cache;
|
1000 |
} |
1001 |
|
1002 |
/* XXX: no longer used */
|
1003 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
1004 |
void (*change_cb)(void *opaque), void *opaque) |
1005 |
{ |
1006 |
bs->change_cb = change_cb; |
1007 |
bs->change_opaque = opaque; |
1008 |
} |
1009 |
|
1010 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
1011 |
{ |
1012 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1013 |
return 1; |
1014 |
return bs->encrypted;
|
1015 |
} |
1016 |
|
1017 |
int bdrv_key_required(BlockDriverState *bs)
|
1018 |
{ |
1019 |
BlockDriverState *backing_hd = bs->backing_hd; |
1020 |
|
1021 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1022 |
return 1; |
1023 |
return (bs->encrypted && !bs->valid_key);
|
1024 |
} |
1025 |
|
1026 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
1027 |
{ |
1028 |
int ret;
|
1029 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1030 |
ret = bdrv_set_key(bs->backing_hd, key); |
1031 |
if (ret < 0) |
1032 |
return ret;
|
1033 |
if (!bs->encrypted)
|
1034 |
return 0; |
1035 |
} |
1036 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
1037 |
return -1; |
1038 |
ret = bs->drv->bdrv_set_key(bs, key); |
1039 |
if (ret < 0) { |
1040 |
bs->valid_key = 0;
|
1041 |
} else if (!bs->valid_key) { |
1042 |
bs->valid_key = 1;
|
1043 |
/* call the change callback now, we skipped it on open */
|
1044 |
bs->media_changed = 1;
|
1045 |
if (bs->change_cb)
|
1046 |
bs->change_cb(bs->change_opaque); |
1047 |
} |
1048 |
return ret;
|
1049 |
} |
1050 |
|
1051 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1052 |
{ |
1053 |
if (!bs->drv) {
|
1054 |
buf[0] = '\0'; |
1055 |
} else {
|
1056 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
1057 |
} |
1058 |
} |
1059 |
|
1060 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1061 |
void *opaque)
|
1062 |
{ |
1063 |
BlockDriver *drv; |
1064 |
|
1065 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
1066 |
it(opaque, drv->format_name); |
1067 |
} |
1068 |
} |
1069 |
|
1070 |
BlockDriverState *bdrv_find(const char *name) |
1071 |
{ |
1072 |
BlockDriverState *bs; |
1073 |
|
1074 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1075 |
if (!strcmp(name, bs->device_name))
|
1076 |
return bs;
|
1077 |
} |
1078 |
return NULL; |
1079 |
} |
1080 |
|
1081 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1082 |
{ |
1083 |
BlockDriverState *bs; |
1084 |
|
1085 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1086 |
it(opaque, bs); |
1087 |
} |
1088 |
} |
1089 |
|
1090 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1091 |
{ |
1092 |
return bs->device_name;
|
1093 |
} |
1094 |
|
1095 |
void bdrv_flush(BlockDriverState *bs)
|
1096 |
{ |
1097 |
if (!bs->drv)
|
1098 |
return;
|
1099 |
if (bs->drv->bdrv_flush)
|
1100 |
bs->drv->bdrv_flush(bs); |
1101 |
if (bs->backing_hd)
|
1102 |
bdrv_flush(bs->backing_hd); |
1103 |
} |
1104 |
|
1105 |
void bdrv_flush_all(void) |
1106 |
{ |
1107 |
BlockDriverState *bs; |
1108 |
|
1109 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1110 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1111 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1112 |
bdrv_flush(bs); |
1113 |
} |
1114 |
|
1115 |
/*
|
1116 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1117 |
* not implementing the functionality are assumed to not support backing files,
|
1118 |
* hence all their sectors are reported as allocated.
|
1119 |
*
|
1120 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1121 |
* the specified sector) that are known to be in the same
|
1122 |
* allocated/unallocated state.
|
1123 |
*
|
1124 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1125 |
*/
|
1126 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1127 |
int *pnum)
|
1128 |
{ |
1129 |
int64_t n; |
1130 |
if (!bs->drv->bdrv_is_allocated) {
|
1131 |
if (sector_num >= bs->total_sectors) {
|
1132 |
*pnum = 0;
|
1133 |
return 0; |
1134 |
} |
1135 |
n = bs->total_sectors - sector_num; |
1136 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1137 |
return 1; |
1138 |
} |
1139 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1140 |
} |
1141 |
|
1142 |
void bdrv_info(Monitor *mon)
|
1143 |
{ |
1144 |
BlockDriverState *bs; |
1145 |
|
1146 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1147 |
monitor_printf(mon, "%s:", bs->device_name);
|
1148 |
monitor_printf(mon, " type=");
|
1149 |
switch(bs->type) {
|
1150 |
case BDRV_TYPE_HD:
|
1151 |
monitor_printf(mon, "hd");
|
1152 |
break;
|
1153 |
case BDRV_TYPE_CDROM:
|
1154 |
monitor_printf(mon, "cdrom");
|
1155 |
break;
|
1156 |
case BDRV_TYPE_FLOPPY:
|
1157 |
monitor_printf(mon, "floppy");
|
1158 |
break;
|
1159 |
} |
1160 |
monitor_printf(mon, " removable=%d", bs->removable);
|
1161 |
if (bs->removable) {
|
1162 |
monitor_printf(mon, " locked=%d", bs->locked);
|
1163 |
} |
1164 |
if (bs->drv) {
|
1165 |
monitor_printf(mon, " file=");
|
1166 |
monitor_print_filename(mon, bs->filename); |
1167 |
if (bs->backing_file[0] != '\0') { |
1168 |
monitor_printf(mon, " backing_file=");
|
1169 |
monitor_print_filename(mon, bs->backing_file); |
1170 |
} |
1171 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
1172 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
1173 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
1174 |
} else {
|
1175 |
monitor_printf(mon, " [not inserted]");
|
1176 |
} |
1177 |
monitor_printf(mon, "\n");
|
1178 |
} |
1179 |
} |
1180 |
|
1181 |
/* The "info blockstats" command. */
|
1182 |
void bdrv_info_stats(Monitor *mon)
|
1183 |
{ |
1184 |
BlockDriverState *bs; |
1185 |
|
1186 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1187 |
monitor_printf(mon, "%s:"
|
1188 |
" rd_bytes=%" PRIu64
|
1189 |
" wr_bytes=%" PRIu64
|
1190 |
" rd_operations=%" PRIu64
|
1191 |
" wr_operations=%" PRIu64
|
1192 |
"\n",
|
1193 |
bs->device_name, |
1194 |
bs->rd_bytes, bs->wr_bytes, |
1195 |
bs->rd_ops, bs->wr_ops); |
1196 |
} |
1197 |
} |
1198 |
|
1199 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1200 |
{ |
1201 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1202 |
return bs->backing_file;
|
1203 |
else if (bs->encrypted) |
1204 |
return bs->filename;
|
1205 |
else
|
1206 |
return NULL; |
1207 |
} |
1208 |
|
1209 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1210 |
char *filename, int filename_size) |
1211 |
{ |
1212 |
if (!bs->backing_hd) {
|
1213 |
pstrcpy(filename, filename_size, "");
|
1214 |
} else {
|
1215 |
pstrcpy(filename, filename_size, bs->backing_file); |
1216 |
} |
1217 |
} |
1218 |
|
1219 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1220 |
const uint8_t *buf, int nb_sectors) |
1221 |
{ |
1222 |
BlockDriver *drv = bs->drv; |
1223 |
if (!drv)
|
1224 |
return -ENOMEDIUM;
|
1225 |
if (!drv->bdrv_write_compressed)
|
1226 |
return -ENOTSUP;
|
1227 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1228 |
return -EIO;
|
1229 |
|
1230 |
if (bs->dirty_bitmap) {
|
1231 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1232 |
} |
1233 |
|
1234 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1235 |
} |
1236 |
|
1237 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1238 |
{ |
1239 |
BlockDriver *drv = bs->drv; |
1240 |
if (!drv)
|
1241 |
return -ENOMEDIUM;
|
1242 |
if (!drv->bdrv_get_info)
|
1243 |
return -ENOTSUP;
|
1244 |
memset(bdi, 0, sizeof(*bdi)); |
1245 |
return drv->bdrv_get_info(bs, bdi);
|
1246 |
} |
1247 |
|
1248 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1249 |
int64_t pos, int size)
|
1250 |
{ |
1251 |
BlockDriver *drv = bs->drv; |
1252 |
if (!drv)
|
1253 |
return -ENOMEDIUM;
|
1254 |
if (!drv->bdrv_save_vmstate)
|
1255 |
return -ENOTSUP;
|
1256 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1257 |
} |
1258 |
|
1259 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1260 |
int64_t pos, int size)
|
1261 |
{ |
1262 |
BlockDriver *drv = bs->drv; |
1263 |
if (!drv)
|
1264 |
return -ENOMEDIUM;
|
1265 |
if (!drv->bdrv_load_vmstate)
|
1266 |
return -ENOTSUP;
|
1267 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1268 |
} |
1269 |
|
1270 |
/**************************************************************/
|
1271 |
/* handling of snapshots */
|
1272 |
|
1273 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1274 |
QEMUSnapshotInfo *sn_info) |
1275 |
{ |
1276 |
BlockDriver *drv = bs->drv; |
1277 |
if (!drv)
|
1278 |
return -ENOMEDIUM;
|
1279 |
if (!drv->bdrv_snapshot_create)
|
1280 |
return -ENOTSUP;
|
1281 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1282 |
} |
1283 |
|
1284 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1285 |
const char *snapshot_id) |
1286 |
{ |
1287 |
BlockDriver *drv = bs->drv; |
1288 |
if (!drv)
|
1289 |
return -ENOMEDIUM;
|
1290 |
if (!drv->bdrv_snapshot_goto)
|
1291 |
return -ENOTSUP;
|
1292 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1293 |
} |
1294 |
|
1295 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1296 |
{ |
1297 |
BlockDriver *drv = bs->drv; |
1298 |
if (!drv)
|
1299 |
return -ENOMEDIUM;
|
1300 |
if (!drv->bdrv_snapshot_delete)
|
1301 |
return -ENOTSUP;
|
1302 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1303 |
} |
1304 |
|
1305 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1306 |
QEMUSnapshotInfo **psn_info) |
1307 |
{ |
1308 |
BlockDriver *drv = bs->drv; |
1309 |
if (!drv)
|
1310 |
return -ENOMEDIUM;
|
1311 |
if (!drv->bdrv_snapshot_list)
|
1312 |
return -ENOTSUP;
|
1313 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1314 |
} |
1315 |
|
1316 |
#define NB_SUFFIXES 4 |
1317 |
|
1318 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1319 |
{ |
1320 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1321 |
int64_t base; |
1322 |
int i;
|
1323 |
|
1324 |
if (size <= 999) { |
1325 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1326 |
} else {
|
1327 |
base = 1024;
|
1328 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1329 |
if (size < (10 * base)) { |
1330 |
snprintf(buf, buf_size, "%0.1f%c",
|
1331 |
(double)size / base,
|
1332 |
suffixes[i]); |
1333 |
break;
|
1334 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1335 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1336 |
((size + (base >> 1)) / base),
|
1337 |
suffixes[i]); |
1338 |
break;
|
1339 |
} |
1340 |
base = base * 1024;
|
1341 |
} |
1342 |
} |
1343 |
return buf;
|
1344 |
} |
1345 |
|
1346 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1347 |
{ |
1348 |
char buf1[128], date_buf[128], clock_buf[128]; |
1349 |
#ifdef _WIN32
|
1350 |
struct tm *ptm;
|
1351 |
#else
|
1352 |
struct tm tm;
|
1353 |
#endif
|
1354 |
time_t ti; |
1355 |
int64_t secs; |
1356 |
|
1357 |
if (!sn) {
|
1358 |
snprintf(buf, buf_size, |
1359 |
"%-10s%-20s%7s%20s%15s",
|
1360 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1361 |
} else {
|
1362 |
ti = sn->date_sec; |
1363 |
#ifdef _WIN32
|
1364 |
ptm = localtime(&ti); |
1365 |
strftime(date_buf, sizeof(date_buf),
|
1366 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1367 |
#else
|
1368 |
localtime_r(&ti, &tm); |
1369 |
strftime(date_buf, sizeof(date_buf),
|
1370 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1371 |
#endif
|
1372 |
secs = sn->vm_clock_nsec / 1000000000;
|
1373 |
snprintf(clock_buf, sizeof(clock_buf),
|
1374 |
"%02d:%02d:%02d.%03d",
|
1375 |
(int)(secs / 3600), |
1376 |
(int)((secs / 60) % 60), |
1377 |
(int)(secs % 60), |
1378 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1379 |
snprintf(buf, buf_size, |
1380 |
"%-10s%-20s%7s%20s%15s",
|
1381 |
sn->id_str, sn->name, |
1382 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1383 |
date_buf, |
1384 |
clock_buf); |
1385 |
} |
1386 |
return buf;
|
1387 |
} |
1388 |
|
1389 |
|
1390 |
/**************************************************************/
|
1391 |
/* async I/Os */
|
1392 |
|
1393 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1394 |
QEMUIOVector *qiov, int nb_sectors,
|
1395 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1396 |
{ |
1397 |
BlockDriver *drv = bs->drv; |
1398 |
BlockDriverAIOCB *ret; |
1399 |
|
1400 |
if (!drv)
|
1401 |
return NULL; |
1402 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1403 |
return NULL; |
1404 |
|
1405 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1406 |
cb, opaque); |
1407 |
|
1408 |
if (ret) {
|
1409 |
/* Update stats even though technically transfer has not happened. */
|
1410 |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1411 |
bs->rd_ops ++; |
1412 |
} |
1413 |
|
1414 |
return ret;
|
1415 |
} |
1416 |
|
1417 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1418 |
QEMUIOVector *qiov, int nb_sectors,
|
1419 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1420 |
{ |
1421 |
BlockDriver *drv = bs->drv; |
1422 |
BlockDriverAIOCB *ret; |
1423 |
|
1424 |
if (!drv)
|
1425 |
return NULL; |
1426 |
if (bs->read_only)
|
1427 |
return NULL; |
1428 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1429 |
return NULL; |
1430 |
|
1431 |
if (bs->dirty_bitmap) {
|
1432 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1433 |
} |
1434 |
|
1435 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1436 |
cb, opaque); |
1437 |
|
1438 |
if (ret) {
|
1439 |
/* Update stats even though technically transfer has not happened. */
|
1440 |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1441 |
bs->wr_ops ++; |
1442 |
} |
1443 |
|
1444 |
return ret;
|
1445 |
} |
1446 |
|
1447 |
|
1448 |
typedef struct MultiwriteCB { |
1449 |
int error;
|
1450 |
int num_requests;
|
1451 |
int num_callbacks;
|
1452 |
struct {
|
1453 |
BlockDriverCompletionFunc *cb; |
1454 |
void *opaque;
|
1455 |
QEMUIOVector *free_qiov; |
1456 |
void *free_buf;
|
1457 |
} callbacks[]; |
1458 |
} MultiwriteCB; |
1459 |
|
1460 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
1461 |
{ |
1462 |
int i;
|
1463 |
|
1464 |
for (i = 0; i < mcb->num_callbacks; i++) { |
1465 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1466 |
qemu_free(mcb->callbacks[i].free_qiov); |
1467 |
qemu_free(mcb->callbacks[i].free_buf); |
1468 |
} |
1469 |
} |
1470 |
|
1471 |
static void multiwrite_cb(void *opaque, int ret) |
1472 |
{ |
1473 |
MultiwriteCB *mcb = opaque; |
1474 |
|
1475 |
if (ret < 0) { |
1476 |
mcb->error = ret; |
1477 |
multiwrite_user_cb(mcb); |
1478 |
} |
1479 |
|
1480 |
mcb->num_requests--; |
1481 |
if (mcb->num_requests == 0) { |
1482 |
if (mcb->error == 0) { |
1483 |
multiwrite_user_cb(mcb); |
1484 |
} |
1485 |
qemu_free(mcb); |
1486 |
} |
1487 |
} |
1488 |
|
1489 |
static int multiwrite_req_compare(const void *a, const void *b) |
1490 |
{ |
1491 |
return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
1492 |
} |
1493 |
|
1494 |
/*
|
1495 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
1496 |
* requests that remain after merging.
|
1497 |
*/
|
1498 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1499 |
int num_reqs, MultiwriteCB *mcb)
|
1500 |
{ |
1501 |
int i, outidx;
|
1502 |
|
1503 |
// Sort requests by start sector
|
1504 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1505 |
|
1506 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
1507 |
// filling up gaps with zero sectors.
|
1508 |
outidx = 0;
|
1509 |
for (i = 1; i < num_reqs; i++) { |
1510 |
int merge = 0; |
1511 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1512 |
|
1513 |
// This handles the cases that are valid for all block drivers, namely
|
1514 |
// exactly sequential writes and overlapping writes.
|
1515 |
if (reqs[i].sector <= oldreq_last) {
|
1516 |
merge = 1;
|
1517 |
} |
1518 |
|
1519 |
// The block driver may decide that it makes sense to combine requests
|
1520 |
// even if there is a gap of some sectors between them. In this case,
|
1521 |
// the gap is filled with zeros (therefore only applicable for yet
|
1522 |
// unused space in format like qcow2).
|
1523 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
1524 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1525 |
} |
1526 |
|
1527 |
if (merge) {
|
1528 |
size_t size; |
1529 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
1530 |
qemu_iovec_init(qiov, |
1531 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
1532 |
|
1533 |
// Add the first request to the merged one. If the requests are
|
1534 |
// overlapping, drop the last sectors of the first request.
|
1535 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
1536 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
1537 |
|
1538 |
// We might need to add some zeros between the two requests
|
1539 |
if (reqs[i].sector > oldreq_last) {
|
1540 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
1541 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
1542 |
memset(buf, 0, zero_bytes);
|
1543 |
qemu_iovec_add(qiov, buf, zero_bytes); |
1544 |
mcb->callbacks[i].free_buf = buf; |
1545 |
} |
1546 |
|
1547 |
// Add the second request
|
1548 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
1549 |
|
1550 |
reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
1551 |
reqs[outidx].qiov = qiov; |
1552 |
|
1553 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
1554 |
} else {
|
1555 |
outidx++; |
1556 |
reqs[outidx].sector = reqs[i].sector; |
1557 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
1558 |
reqs[outidx].qiov = reqs[i].qiov; |
1559 |
} |
1560 |
} |
1561 |
|
1562 |
return outidx + 1; |
1563 |
} |
1564 |
|
1565 |
/*
|
1566 |
* Submit multiple AIO write requests at once.
|
1567 |
*
|
1568 |
* On success, the function returns 0 and all requests in the reqs array have
|
1569 |
* been submitted. In error case this function returns -1, and any of the
|
1570 |
* requests may or may not be submitted yet. In particular, this means that the
|
1571 |
* callback will be called for some of the requests, for others it won't. The
|
1572 |
* caller must check the error field of the BlockRequest to wait for the right
|
1573 |
* callbacks (if error != 0, no callback will be called).
|
1574 |
*
|
1575 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
1576 |
* requests. However, the fields opaque and error are left unmodified as they
|
1577 |
* are used to signal failure for a single request to the caller.
|
1578 |
*/
|
1579 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
1580 |
{ |
1581 |
BlockDriverAIOCB *acb; |
1582 |
MultiwriteCB *mcb; |
1583 |
int i;
|
1584 |
|
1585 |
if (num_reqs == 0) { |
1586 |
return 0; |
1587 |
} |
1588 |
|
1589 |
// Create MultiwriteCB structure
|
1590 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
1591 |
mcb->num_requests = 0;
|
1592 |
mcb->num_callbacks = num_reqs; |
1593 |
|
1594 |
for (i = 0; i < num_reqs; i++) { |
1595 |
mcb->callbacks[i].cb = reqs[i].cb; |
1596 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
1597 |
} |
1598 |
|
1599 |
// Check for mergable requests
|
1600 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
1601 |
|
1602 |
// Run the aio requests
|
1603 |
for (i = 0; i < num_reqs; i++) { |
1604 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
1605 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
1606 |
|
1607 |
if (acb == NULL) { |
1608 |
// We can only fail the whole thing if no request has been
|
1609 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
1610 |
// complete and report the error in the callback.
|
1611 |
if (mcb->num_requests == 0) { |
1612 |
reqs[i].error = EIO; |
1613 |
goto fail;
|
1614 |
} else {
|
1615 |
mcb->error = EIO; |
1616 |
break;
|
1617 |
} |
1618 |
} else {
|
1619 |
mcb->num_requests++; |
1620 |
} |
1621 |
} |
1622 |
|
1623 |
return 0; |
1624 |
|
1625 |
fail:
|
1626 |
free(mcb); |
1627 |
return -1; |
1628 |
} |
1629 |
|
1630 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1631 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1632 |
{ |
1633 |
BlockDriver *drv = bs->drv; |
1634 |
|
1635 |
if (!drv)
|
1636 |
return NULL; |
1637 |
|
1638 |
/*
|
1639 |
* Note that unlike bdrv_flush the driver is reponsible for flushing a
|
1640 |
* backing image if it exists.
|
1641 |
*/
|
1642 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
1643 |
} |
1644 |
|
1645 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1646 |
{ |
1647 |
acb->pool->cancel(acb); |
1648 |
} |
1649 |
|
1650 |
|
1651 |
/**************************************************************/
|
1652 |
/* async block device emulation */
|
1653 |
|
1654 |
typedef struct BlockDriverAIOCBSync { |
1655 |
BlockDriverAIOCB common; |
1656 |
QEMUBH *bh; |
1657 |
int ret;
|
1658 |
/* vector translation state */
|
1659 |
QEMUIOVector *qiov; |
1660 |
uint8_t *bounce; |
1661 |
int is_write;
|
1662 |
} BlockDriverAIOCBSync; |
1663 |
|
1664 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1665 |
{ |
1666 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1667 |
qemu_bh_delete(acb->bh); |
1668 |
acb->bh = NULL;
|
1669 |
qemu_aio_release(acb); |
1670 |
} |
1671 |
|
1672 |
static AIOPool bdrv_em_aio_pool = {
|
1673 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
1674 |
.cancel = bdrv_aio_cancel_em, |
1675 |
}; |
1676 |
|
1677 |
static void bdrv_aio_bh_cb(void *opaque) |
1678 |
{ |
1679 |
BlockDriverAIOCBSync *acb = opaque; |
1680 |
|
1681 |
if (!acb->is_write)
|
1682 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
1683 |
qemu_vfree(acb->bounce); |
1684 |
acb->common.cb(acb->common.opaque, acb->ret); |
1685 |
qemu_bh_delete(acb->bh); |
1686 |
acb->bh = NULL;
|
1687 |
qemu_aio_release(acb); |
1688 |
} |
1689 |
|
1690 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1691 |
int64_t sector_num, |
1692 |
QEMUIOVector *qiov, |
1693 |
int nb_sectors,
|
1694 |
BlockDriverCompletionFunc *cb, |
1695 |
void *opaque,
|
1696 |
int is_write)
|
1697 |
|
1698 |
{ |
1699 |
BlockDriverAIOCBSync *acb; |
1700 |
|
1701 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1702 |
acb->is_write = is_write; |
1703 |
acb->qiov = qiov; |
1704 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
1705 |
|
1706 |
if (!acb->bh)
|
1707 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1708 |
|
1709 |
if (is_write) {
|
1710 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
1711 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
1712 |
} else {
|
1713 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
1714 |
} |
1715 |
|
1716 |
qemu_bh_schedule(acb->bh); |
1717 |
|
1718 |
return &acb->common;
|
1719 |
} |
1720 |
|
1721 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
1722 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1723 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1724 |
{ |
1725 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1726 |
} |
1727 |
|
1728 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
1729 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1730 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1731 |
{ |
1732 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
1733 |
} |
1734 |
|
1735 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
1736 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1737 |
{ |
1738 |
BlockDriverAIOCBSync *acb; |
1739 |
|
1740 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1741 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
1742 |
acb->qiov = NULL;
|
1743 |
acb->bounce = NULL;
|
1744 |
acb->ret = 0;
|
1745 |
|
1746 |
if (!acb->bh)
|
1747 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1748 |
|
1749 |
bdrv_flush(bs); |
1750 |
qemu_bh_schedule(acb->bh); |
1751 |
return &acb->common;
|
1752 |
} |
1753 |
|
1754 |
/**************************************************************/
|
1755 |
/* sync block device emulation */
|
1756 |
|
1757 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1758 |
{ |
1759 |
*(int *)opaque = ret;
|
1760 |
} |
1761 |
|
1762 |
#define NOT_DONE 0x7fffffff |
1763 |
|
1764 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1765 |
uint8_t *buf, int nb_sectors)
|
1766 |
{ |
1767 |
int async_ret;
|
1768 |
BlockDriverAIOCB *acb; |
1769 |
struct iovec iov;
|
1770 |
QEMUIOVector qiov; |
1771 |
|
1772 |
async_context_push(); |
1773 |
|
1774 |
async_ret = NOT_DONE; |
1775 |
iov.iov_base = (void *)buf;
|
1776 |
iov.iov_len = nb_sectors * 512;
|
1777 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1778 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
1779 |
bdrv_rw_em_cb, &async_ret); |
1780 |
if (acb == NULL) { |
1781 |
async_ret = -1;
|
1782 |
goto fail;
|
1783 |
} |
1784 |
|
1785 |
while (async_ret == NOT_DONE) {
|
1786 |
qemu_aio_wait(); |
1787 |
} |
1788 |
|
1789 |
|
1790 |
fail:
|
1791 |
async_context_pop(); |
1792 |
return async_ret;
|
1793 |
} |
1794 |
|
1795 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1796 |
const uint8_t *buf, int nb_sectors) |
1797 |
{ |
1798 |
int async_ret;
|
1799 |
BlockDriverAIOCB *acb; |
1800 |
struct iovec iov;
|
1801 |
QEMUIOVector qiov; |
1802 |
|
1803 |
async_context_push(); |
1804 |
|
1805 |
async_ret = NOT_DONE; |
1806 |
iov.iov_base = (void *)buf;
|
1807 |
iov.iov_len = nb_sectors * 512;
|
1808 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1809 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
1810 |
bdrv_rw_em_cb, &async_ret); |
1811 |
if (acb == NULL) { |
1812 |
async_ret = -1;
|
1813 |
goto fail;
|
1814 |
} |
1815 |
while (async_ret == NOT_DONE) {
|
1816 |
qemu_aio_wait(); |
1817 |
} |
1818 |
|
1819 |
fail:
|
1820 |
async_context_pop(); |
1821 |
return async_ret;
|
1822 |
} |
1823 |
|
1824 |
void bdrv_init(void) |
1825 |
{ |
1826 |
module_call_init(MODULE_INIT_BLOCK); |
1827 |
} |
1828 |
|
1829 |
void bdrv_init_with_whitelist(void) |
1830 |
{ |
1831 |
use_bdrv_whitelist = 1;
|
1832 |
bdrv_init(); |
1833 |
} |
1834 |
|
1835 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
1836 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1837 |
{ |
1838 |
BlockDriverAIOCB *acb; |
1839 |
|
1840 |
if (pool->free_aiocb) {
|
1841 |
acb = pool->free_aiocb; |
1842 |
pool->free_aiocb = acb->next; |
1843 |
} else {
|
1844 |
acb = qemu_mallocz(pool->aiocb_size); |
1845 |
acb->pool = pool; |
1846 |
} |
1847 |
acb->bs = bs; |
1848 |
acb->cb = cb; |
1849 |
acb->opaque = opaque; |
1850 |
return acb;
|
1851 |
} |
1852 |
|
1853 |
void qemu_aio_release(void *p) |
1854 |
{ |
1855 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1856 |
AIOPool *pool = acb->pool; |
1857 |
acb->next = pool->free_aiocb; |
1858 |
pool->free_aiocb = acb; |
1859 |
} |
1860 |
|
1861 |
/**************************************************************/
|
1862 |
/* removable device support */
|
1863 |
|
1864 |
/**
|
1865 |
* Return TRUE if the media is present
|
1866 |
*/
|
1867 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1868 |
{ |
1869 |
BlockDriver *drv = bs->drv; |
1870 |
int ret;
|
1871 |
if (!drv)
|
1872 |
return 0; |
1873 |
if (!drv->bdrv_is_inserted)
|
1874 |
return 1; |
1875 |
ret = drv->bdrv_is_inserted(bs); |
1876 |
return ret;
|
1877 |
} |
1878 |
|
1879 |
/**
|
1880 |
* Return TRUE if the media changed since the last call to this
|
1881 |
* function. It is currently only used for floppy disks
|
1882 |
*/
|
1883 |
int bdrv_media_changed(BlockDriverState *bs)
|
1884 |
{ |
1885 |
BlockDriver *drv = bs->drv; |
1886 |
int ret;
|
1887 |
|
1888 |
if (!drv || !drv->bdrv_media_changed)
|
1889 |
ret = -ENOTSUP; |
1890 |
else
|
1891 |
ret = drv->bdrv_media_changed(bs); |
1892 |
if (ret == -ENOTSUP)
|
1893 |
ret = bs->media_changed; |
1894 |
bs->media_changed = 0;
|
1895 |
return ret;
|
1896 |
} |
1897 |
|
1898 |
/**
|
1899 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1900 |
*/
|
1901 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
1902 |
{ |
1903 |
BlockDriver *drv = bs->drv; |
1904 |
int ret;
|
1905 |
|
1906 |
if (bs->locked) {
|
1907 |
return -EBUSY;
|
1908 |
} |
1909 |
|
1910 |
if (!drv || !drv->bdrv_eject) {
|
1911 |
ret = -ENOTSUP; |
1912 |
} else {
|
1913 |
ret = drv->bdrv_eject(bs, eject_flag); |
1914 |
} |
1915 |
if (ret == -ENOTSUP) {
|
1916 |
if (eject_flag)
|
1917 |
bdrv_close(bs); |
1918 |
ret = 0;
|
1919 |
} |
1920 |
|
1921 |
return ret;
|
1922 |
} |
1923 |
|
1924 |
int bdrv_is_locked(BlockDriverState *bs)
|
1925 |
{ |
1926 |
return bs->locked;
|
1927 |
} |
1928 |
|
1929 |
/**
|
1930 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1931 |
* to eject it manually).
|
1932 |
*/
|
1933 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1934 |
{ |
1935 |
BlockDriver *drv = bs->drv; |
1936 |
|
1937 |
bs->locked = locked; |
1938 |
if (drv && drv->bdrv_set_locked) {
|
1939 |
drv->bdrv_set_locked(bs, locked); |
1940 |
} |
1941 |
} |
1942 |
|
1943 |
/* needed for generic scsi interface */
|
1944 |
|
1945 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1946 |
{ |
1947 |
BlockDriver *drv = bs->drv; |
1948 |
|
1949 |
if (drv && drv->bdrv_ioctl)
|
1950 |
return drv->bdrv_ioctl(bs, req, buf);
|
1951 |
return -ENOTSUP;
|
1952 |
} |
1953 |
|
1954 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1955 |
unsigned long int req, void *buf, |
1956 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1957 |
{ |
1958 |
BlockDriver *drv = bs->drv; |
1959 |
|
1960 |
if (drv && drv->bdrv_aio_ioctl)
|
1961 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
1962 |
return NULL; |
1963 |
} |
1964 |
|
1965 |
|
1966 |
|
1967 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
1968 |
{ |
1969 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
1970 |
} |
1971 |
|
1972 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
1973 |
{ |
1974 |
int64_t bitmap_size; |
1975 |
|
1976 |
if (enable) {
|
1977 |
if (!bs->dirty_bitmap) {
|
1978 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
1979 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
1980 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
1981 |
|
1982 |
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
1983 |
} |
1984 |
} else {
|
1985 |
if (bs->dirty_bitmap) {
|
1986 |
qemu_free(bs->dirty_bitmap); |
1987 |
bs->dirty_bitmap = NULL;
|
1988 |
} |
1989 |
} |
1990 |
} |
1991 |
|
1992 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
1993 |
{ |
1994 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
1995 |
|
1996 |
if (bs->dirty_bitmap &&
|
1997 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
1998 |
return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
1999 |
(1 << (chunk % (sizeof(unsigned long) * 8))); |
2000 |
} else {
|
2001 |
return 0; |
2002 |
} |
2003 |
} |
2004 |
|
2005 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2006 |
int nr_sectors)
|
2007 |
{ |
2008 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2009 |
} |