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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 |
#include "qemu-objects.h" |
30 |
|
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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); |
57 |
|
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BlockDriverState *bdrv_first; |
59 |
|
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static BlockDriver *first_drv;
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61 |
|
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/* If non-zero, use only whitelisted block drivers */
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static int use_bdrv_whitelist; |
64 |
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int path_is_absolute(const char *path) |
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{ |
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const char *p; |
68 |
#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
|
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if (*path == '/' || *path == '\\') |
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return 1; |
72 |
#endif
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p = strchr(path, ':');
|
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if (p)
|
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p++; |
76 |
else
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
80 |
#else
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return (*p == '/'); |
82 |
#endif
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} |
84 |
|
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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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{ |
92 |
const char *p, *p1; |
93 |
int len;
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94 |
|
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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); |
99 |
} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
103 |
else
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p = base_path; |
105 |
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++; |
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else
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p1 = base_path; |
118 |
if (p1 > p)
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p = p1; |
120 |
len = p - base_path; |
121 |
if (len > dest_size - 1) |
122 |
len = dest_size - 1;
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memcpy(dest, base_path, len); |
124 |
dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
126 |
} |
127 |
} |
128 |
|
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void bdrv_register(BlockDriver *bdrv)
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{ |
131 |
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; |
134 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
135 |
} else if (!bdrv->bdrv_read) { |
136 |
/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
138 |
bdrv->bdrv_write = bdrv_write_em; |
139 |
} |
140 |
|
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if (!bdrv->bdrv_aio_flush)
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142 |
bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
143 |
|
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bdrv->next = first_drv; |
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first_drv = bdrv; |
146 |
} |
147 |
|
148 |
/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name) |
150 |
{ |
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BlockDriverState **pbs, *bs; |
152 |
|
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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') { |
156 |
/* insert at the end */
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pbs = &bdrv_first; |
158 |
while (*pbs != NULL) |
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pbs = &(*pbs)->next; |
160 |
*pbs = bs; |
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} |
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return bs;
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} |
164 |
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BlockDriver *bdrv_find_format(const char *format_name) |
166 |
{ |
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BlockDriver *drv1; |
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
169 |
if (!strcmp(drv1->format_name, format_name))
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return drv1;
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} |
172 |
return NULL; |
173 |
} |
174 |
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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 |
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}; |
180 |
const char **p; |
181 |
|
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
184 |
|
185 |
for (p = whitelist; *p; p++) {
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if (!strcmp(drv->format_name, *p)) {
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return 1; |
188 |
} |
189 |
} |
190 |
return 0; |
191 |
} |
192 |
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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; |
197 |
} |
198 |
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
201 |
{ |
202 |
if (!drv->bdrv_create)
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return -ENOTSUP;
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204 |
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return drv->bdrv_create(filename, options);
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} |
207 |
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
210 |
{ |
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char temp_dir[MAX_PATH];
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GetTempPath(MAX_PATH, temp_dir); |
214 |
GetTempFileName(temp_dir, "qem", 0, filename); |
215 |
} |
216 |
#else
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void get_tmp_filename(char *filename, int size) |
218 |
{ |
219 |
int fd;
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const char *tmpdir; |
221 |
/* XXX: race condition possible */
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222 |
tmpdir = getenv("TMPDIR");
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223 |
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); |
227 |
close(fd); |
228 |
} |
229 |
#endif
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230 |
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231 |
#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
233 |
{ |
234 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
237 |
} |
238 |
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int is_windows_drive(const char *filename) |
240 |
{ |
241 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
243 |
return 1; |
244 |
if (strstart(filename, "\\\\.\\", NULL) || |
245 |
strstart(filename, "//./", NULL)) |
246 |
return 1; |
247 |
return 0; |
248 |
} |
249 |
#endif
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250 |
|
251 |
static BlockDriver *find_protocol(const char *filename) |
252 |
{ |
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BlockDriver *drv1; |
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char protocol[128]; |
255 |
int len;
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256 |
const char *p; |
257 |
|
258 |
#ifdef _WIN32
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259 |
if (is_windows_drive(filename) ||
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260 |
is_windows_drive_prefix(filename)) |
261 |
return bdrv_find_format("raw"); |
262 |
#endif
|
263 |
p = strchr(filename, ':');
|
264 |
if (!p)
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return bdrv_find_format("raw"); |
266 |
len = p - filename; |
267 |
if (len > sizeof(protocol) - 1) |
268 |
len = sizeof(protocol) - 1; |
269 |
memcpy(protocol, filename, len); |
270 |
protocol[len] = '\0';
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
272 |
if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) |
274 |
return drv1;
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275 |
} |
276 |
return NULL; |
277 |
} |
278 |
|
279 |
/*
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280 |
* Detect host devices. By convention, /dev/cdrom[N] is always
|
281 |
* recognized as a host CDROM.
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*/
|
283 |
static BlockDriver *find_hdev_driver(const char *filename) |
284 |
{ |
285 |
int score_max = 0, score; |
286 |
BlockDriver *drv = NULL, *d;
|
287 |
|
288 |
for (d = first_drv; d; d = d->next) {
|
289 |
if (d->bdrv_probe_device) {
|
290 |
score = d->bdrv_probe_device(filename); |
291 |
if (score > score_max) {
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292 |
score_max = score; |
293 |
drv = d; |
294 |
} |
295 |
} |
296 |
} |
297 |
|
298 |
return drv;
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299 |
} |
300 |
|
301 |
static BlockDriver *find_image_format(const char *filename) |
302 |
{ |
303 |
int ret, score, score_max;
|
304 |
BlockDriver *drv1, *drv; |
305 |
uint8_t buf[2048];
|
306 |
BlockDriverState *bs; |
307 |
|
308 |
drv = find_protocol(filename); |
309 |
/* no need to test disk image formats for vvfat */
|
310 |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
311 |
return drv;
|
312 |
|
313 |
ret = bdrv_file_open(&bs, filename, 0);
|
314 |
if (ret < 0) |
315 |
return NULL; |
316 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
317 |
bdrv_delete(bs); |
318 |
if (ret < 0) { |
319 |
return NULL; |
320 |
} |
321 |
|
322 |
score_max = 0;
|
323 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
324 |
if (drv1->bdrv_probe) {
|
325 |
score = drv1->bdrv_probe(buf, ret, filename); |
326 |
if (score > score_max) {
|
327 |
score_max = score; |
328 |
drv = drv1; |
329 |
} |
330 |
} |
331 |
} |
332 |
return drv;
|
333 |
} |
334 |
|
335 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
336 |
{ |
337 |
BlockDriverState *bs; |
338 |
int ret;
|
339 |
|
340 |
bs = bdrv_new("");
|
341 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
342 |
if (ret < 0) { |
343 |
bdrv_delete(bs); |
344 |
return ret;
|
345 |
} |
346 |
bs->growable = 1;
|
347 |
*pbs = bs; |
348 |
return 0; |
349 |
} |
350 |
|
351 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
352 |
{ |
353 |
return bdrv_open2(bs, filename, flags, NULL); |
354 |
} |
355 |
|
356 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
357 |
BlockDriver *drv) |
358 |
{ |
359 |
int ret, open_flags;
|
360 |
char tmp_filename[PATH_MAX];
|
361 |
char backing_filename[PATH_MAX];
|
362 |
|
363 |
bs->is_temporary = 0;
|
364 |
bs->encrypted = 0;
|
365 |
bs->valid_key = 0;
|
366 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
367 |
bs->buffer_alignment = 512;
|
368 |
|
369 |
if (flags & BDRV_O_SNAPSHOT) {
|
370 |
BlockDriverState *bs1; |
371 |
int64_t total_size; |
372 |
int is_protocol = 0; |
373 |
BlockDriver *bdrv_qcow2; |
374 |
QEMUOptionParameter *options; |
375 |
|
376 |
/* if snapshot, we create a temporary backing file and open it
|
377 |
instead of opening 'filename' directly */
|
378 |
|
379 |
/* if there is a backing file, use it */
|
380 |
bs1 = bdrv_new("");
|
381 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
382 |
if (ret < 0) { |
383 |
bdrv_delete(bs1); |
384 |
return ret;
|
385 |
} |
386 |
total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
387 |
|
388 |
if (bs1->drv && bs1->drv->protocol_name)
|
389 |
is_protocol = 1;
|
390 |
|
391 |
bdrv_delete(bs1); |
392 |
|
393 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
394 |
|
395 |
/* Real path is meaningless for protocols */
|
396 |
if (is_protocol)
|
397 |
snprintf(backing_filename, sizeof(backing_filename),
|
398 |
"%s", filename);
|
399 |
else if (!realpath(filename, backing_filename)) |
400 |
return -errno;
|
401 |
|
402 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
403 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
404 |
|
405 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
406 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
407 |
if (drv) {
|
408 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
409 |
drv->format_name); |
410 |
} |
411 |
|
412 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
413 |
if (ret < 0) { |
414 |
return ret;
|
415 |
} |
416 |
|
417 |
filename = tmp_filename; |
418 |
drv = bdrv_qcow2; |
419 |
bs->is_temporary = 1;
|
420 |
} |
421 |
|
422 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
423 |
if (flags & BDRV_O_FILE) {
|
424 |
drv = find_protocol(filename); |
425 |
} else if (!drv) { |
426 |
drv = find_hdev_driver(filename); |
427 |
if (!drv) {
|
428 |
drv = find_image_format(filename); |
429 |
} |
430 |
} |
431 |
if (!drv) {
|
432 |
ret = -ENOENT; |
433 |
goto unlink_and_fail;
|
434 |
} |
435 |
bs->drv = drv; |
436 |
bs->opaque = qemu_mallocz(drv->instance_size); |
437 |
|
438 |
/*
|
439 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
440 |
* write cache to the guest. We do need the fdatasync to flush
|
441 |
* out transactions for block allocations, and we maybe have a
|
442 |
* volatile write cache in our backing device to deal with.
|
443 |
*/
|
444 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
445 |
bs->enable_write_cache = 1;
|
446 |
|
447 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
448 |
RDONLY as fallback */
|
449 |
bs->read_only = (flags & BDRV_O_RDWR) == 0;
|
450 |
if (!(flags & BDRV_O_FILE)) {
|
451 |
open_flags = (flags & (BDRV_O_RDWR | BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
452 |
if (bs->is_temporary) { /* snapshot should be writeable */ |
453 |
open_flags |= BDRV_O_RDWR; |
454 |
} |
455 |
} else {
|
456 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
457 |
} |
458 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
459 |
ret = -ENOTSUP; |
460 |
} else {
|
461 |
ret = drv->bdrv_open(bs, filename, open_flags); |
462 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
463 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
464 |
bs->read_only = 1;
|
465 |
} |
466 |
} |
467 |
if (ret < 0) { |
468 |
qemu_free(bs->opaque); |
469 |
bs->opaque = NULL;
|
470 |
bs->drv = NULL;
|
471 |
unlink_and_fail:
|
472 |
if (bs->is_temporary)
|
473 |
unlink(filename); |
474 |
return ret;
|
475 |
} |
476 |
if (drv->bdrv_getlength) {
|
477 |
bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
478 |
} |
479 |
#ifndef _WIN32
|
480 |
if (bs->is_temporary) {
|
481 |
unlink(filename); |
482 |
} |
483 |
#endif
|
484 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
485 |
/* if there is a backing file, use it */
|
486 |
BlockDriver *back_drv = NULL;
|
487 |
bs->backing_hd = bdrv_new("");
|
488 |
path_combine(backing_filename, sizeof(backing_filename),
|
489 |
filename, bs->backing_file); |
490 |
if (bs->backing_format[0] != '\0') |
491 |
back_drv = bdrv_find_format(bs->backing_format); |
492 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
493 |
back_drv); |
494 |
bs->backing_hd->read_only = (open_flags & BDRV_O_RDWR) == 0;
|
495 |
if (ret < 0) { |
496 |
bdrv_close(bs); |
497 |
return ret;
|
498 |
} |
499 |
} |
500 |
|
501 |
if (!bdrv_key_required(bs)) {
|
502 |
/* call the change callback */
|
503 |
bs->media_changed = 1;
|
504 |
if (bs->change_cb)
|
505 |
bs->change_cb(bs->change_opaque); |
506 |
} |
507 |
return 0; |
508 |
} |
509 |
|
510 |
void bdrv_close(BlockDriverState *bs)
|
511 |
{ |
512 |
if (bs->drv) {
|
513 |
if (bs->backing_hd)
|
514 |
bdrv_delete(bs->backing_hd); |
515 |
bs->drv->bdrv_close(bs); |
516 |
qemu_free(bs->opaque); |
517 |
#ifdef _WIN32
|
518 |
if (bs->is_temporary) {
|
519 |
unlink(bs->filename); |
520 |
} |
521 |
#endif
|
522 |
bs->opaque = NULL;
|
523 |
bs->drv = NULL;
|
524 |
|
525 |
/* call the change callback */
|
526 |
bs->media_changed = 1;
|
527 |
if (bs->change_cb)
|
528 |
bs->change_cb(bs->change_opaque); |
529 |
} |
530 |
} |
531 |
|
532 |
void bdrv_delete(BlockDriverState *bs)
|
533 |
{ |
534 |
BlockDriverState **pbs; |
535 |
|
536 |
pbs = &bdrv_first; |
537 |
while (*pbs != bs && *pbs != NULL) |
538 |
pbs = &(*pbs)->next; |
539 |
if (*pbs == bs)
|
540 |
*pbs = bs->next; |
541 |
|
542 |
bdrv_close(bs); |
543 |
qemu_free(bs); |
544 |
} |
545 |
|
546 |
/*
|
547 |
* Run consistency checks on an image
|
548 |
*
|
549 |
* Returns the number of errors or -errno when an internal error occurs
|
550 |
*/
|
551 |
int bdrv_check(BlockDriverState *bs)
|
552 |
{ |
553 |
if (bs->drv->bdrv_check == NULL) { |
554 |
return -ENOTSUP;
|
555 |
} |
556 |
|
557 |
return bs->drv->bdrv_check(bs);
|
558 |
} |
559 |
|
560 |
/* commit COW file into the raw image */
|
561 |
int bdrv_commit(BlockDriverState *bs)
|
562 |
{ |
563 |
BlockDriver *drv = bs->drv; |
564 |
int64_t i, total_sectors; |
565 |
int n, j;
|
566 |
unsigned char sector[512]; |
567 |
|
568 |
if (!drv)
|
569 |
return -ENOMEDIUM;
|
570 |
|
571 |
if (bs->read_only) {
|
572 |
return -EACCES;
|
573 |
} |
574 |
|
575 |
if (!bs->backing_hd) {
|
576 |
return -ENOTSUP;
|
577 |
} |
578 |
|
579 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
580 |
for (i = 0; i < total_sectors;) { |
581 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
582 |
for(j = 0; j < n; j++) { |
583 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
584 |
return -EIO;
|
585 |
} |
586 |
|
587 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
588 |
return -EIO;
|
589 |
} |
590 |
i++; |
591 |
} |
592 |
} else {
|
593 |
i += n; |
594 |
} |
595 |
} |
596 |
|
597 |
if (drv->bdrv_make_empty)
|
598 |
return drv->bdrv_make_empty(bs);
|
599 |
|
600 |
/*
|
601 |
* Make sure all data we wrote to the backing device is actually
|
602 |
* stable on disk.
|
603 |
*/
|
604 |
if (bs->backing_hd)
|
605 |
bdrv_flush(bs->backing_hd); |
606 |
return 0; |
607 |
} |
608 |
|
609 |
/*
|
610 |
* Return values:
|
611 |
* 0 - success
|
612 |
* -EINVAL - backing format specified, but no file
|
613 |
* -ENOSPC - can't update the backing file because no space is left in the
|
614 |
* image file header
|
615 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
616 |
*/
|
617 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
618 |
const char *backing_file, const char *backing_fmt) |
619 |
{ |
620 |
BlockDriver *drv = bs->drv; |
621 |
|
622 |
if (drv->bdrv_change_backing_file != NULL) { |
623 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
624 |
} else {
|
625 |
return -ENOTSUP;
|
626 |
} |
627 |
} |
628 |
|
629 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
630 |
size_t size) |
631 |
{ |
632 |
int64_t len; |
633 |
|
634 |
if (!bdrv_is_inserted(bs))
|
635 |
return -ENOMEDIUM;
|
636 |
|
637 |
if (bs->growable)
|
638 |
return 0; |
639 |
|
640 |
len = bdrv_getlength(bs); |
641 |
|
642 |
if (offset < 0) |
643 |
return -EIO;
|
644 |
|
645 |
if ((offset > len) || (len - offset < size))
|
646 |
return -EIO;
|
647 |
|
648 |
return 0; |
649 |
} |
650 |
|
651 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
652 |
int nb_sectors)
|
653 |
{ |
654 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
655 |
} |
656 |
|
657 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
658 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
659 |
uint8_t *buf, int nb_sectors)
|
660 |
{ |
661 |
BlockDriver *drv = bs->drv; |
662 |
|
663 |
if (!drv)
|
664 |
return -ENOMEDIUM;
|
665 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
666 |
return -EIO;
|
667 |
|
668 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
669 |
} |
670 |
|
671 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
672 |
int nb_sectors, int dirty) |
673 |
{ |
674 |
int64_t start, end; |
675 |
unsigned long val, idx, bit; |
676 |
|
677 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
678 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
679 |
|
680 |
for (; start <= end; start++) {
|
681 |
idx = start / (sizeof(unsigned long) * 8); |
682 |
bit = start % (sizeof(unsigned long) * 8); |
683 |
val = bs->dirty_bitmap[idx]; |
684 |
if (dirty) {
|
685 |
val |= 1 << bit;
|
686 |
} else {
|
687 |
val &= ~(1 << bit);
|
688 |
} |
689 |
bs->dirty_bitmap[idx] = val; |
690 |
} |
691 |
} |
692 |
|
693 |
/* Return < 0 if error. Important errors are:
|
694 |
-EIO generic I/O error (may happen for all errors)
|
695 |
-ENOMEDIUM No media inserted.
|
696 |
-EINVAL Invalid sector number or nb_sectors
|
697 |
-EACCES Trying to write a read-only device
|
698 |
*/
|
699 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
700 |
const uint8_t *buf, int nb_sectors) |
701 |
{ |
702 |
BlockDriver *drv = bs->drv; |
703 |
if (!bs->drv)
|
704 |
return -ENOMEDIUM;
|
705 |
if (bs->read_only)
|
706 |
return -EACCES;
|
707 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
708 |
return -EIO;
|
709 |
|
710 |
if (bs->dirty_bitmap) {
|
711 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
712 |
} |
713 |
|
714 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
715 |
} |
716 |
|
717 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
718 |
void *buf, int count1) |
719 |
{ |
720 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
721 |
int len, nb_sectors, count;
|
722 |
int64_t sector_num; |
723 |
|
724 |
count = count1; |
725 |
/* first read to align to sector start */
|
726 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
727 |
if (len > count)
|
728 |
len = count; |
729 |
sector_num = offset >> BDRV_SECTOR_BITS; |
730 |
if (len > 0) { |
731 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
732 |
return -EIO;
|
733 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
734 |
count -= len; |
735 |
if (count == 0) |
736 |
return count1;
|
737 |
sector_num++; |
738 |
buf += len; |
739 |
} |
740 |
|
741 |
/* read the sectors "in place" */
|
742 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
743 |
if (nb_sectors > 0) { |
744 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
745 |
return -EIO;
|
746 |
sector_num += nb_sectors; |
747 |
len = nb_sectors << BDRV_SECTOR_BITS; |
748 |
buf += len; |
749 |
count -= len; |
750 |
} |
751 |
|
752 |
/* add data from the last sector */
|
753 |
if (count > 0) { |
754 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
755 |
return -EIO;
|
756 |
memcpy(buf, tmp_buf, count); |
757 |
} |
758 |
return count1;
|
759 |
} |
760 |
|
761 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
762 |
const void *buf, int count1) |
763 |
{ |
764 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
765 |
int len, nb_sectors, count;
|
766 |
int64_t sector_num; |
767 |
|
768 |
count = count1; |
769 |
/* first write to align to sector start */
|
770 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
771 |
if (len > count)
|
772 |
len = count; |
773 |
sector_num = offset >> BDRV_SECTOR_BITS; |
774 |
if (len > 0) { |
775 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
776 |
return -EIO;
|
777 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
778 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
779 |
return -EIO;
|
780 |
count -= len; |
781 |
if (count == 0) |
782 |
return count1;
|
783 |
sector_num++; |
784 |
buf += len; |
785 |
} |
786 |
|
787 |
/* write the sectors "in place" */
|
788 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
789 |
if (nb_sectors > 0) { |
790 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
791 |
return -EIO;
|
792 |
sector_num += nb_sectors; |
793 |
len = nb_sectors << BDRV_SECTOR_BITS; |
794 |
buf += len; |
795 |
count -= len; |
796 |
} |
797 |
|
798 |
/* add data from the last sector */
|
799 |
if (count > 0) { |
800 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
801 |
return -EIO;
|
802 |
memcpy(tmp_buf, buf, count); |
803 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
804 |
return -EIO;
|
805 |
} |
806 |
return count1;
|
807 |
} |
808 |
|
809 |
/**
|
810 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
811 |
*/
|
812 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
813 |
{ |
814 |
BlockDriver *drv = bs->drv; |
815 |
if (!drv)
|
816 |
return -ENOMEDIUM;
|
817 |
if (!drv->bdrv_truncate)
|
818 |
return -ENOTSUP;
|
819 |
if (bs->read_only)
|
820 |
return -EACCES;
|
821 |
return drv->bdrv_truncate(bs, offset);
|
822 |
} |
823 |
|
824 |
/**
|
825 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
826 |
*/
|
827 |
int64_t bdrv_getlength(BlockDriverState *bs) |
828 |
{ |
829 |
BlockDriver *drv = bs->drv; |
830 |
if (!drv)
|
831 |
return -ENOMEDIUM;
|
832 |
if (!drv->bdrv_getlength) {
|
833 |
/* legacy mode */
|
834 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
835 |
} |
836 |
return drv->bdrv_getlength(bs);
|
837 |
} |
838 |
|
839 |
/* return 0 as number of sectors if no device present or error */
|
840 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
841 |
{ |
842 |
int64_t length; |
843 |
length = bdrv_getlength(bs); |
844 |
if (length < 0) |
845 |
length = 0;
|
846 |
else
|
847 |
length = length >> BDRV_SECTOR_BITS; |
848 |
*nb_sectors_ptr = length; |
849 |
} |
850 |
|
851 |
struct partition {
|
852 |
uint8_t boot_ind; /* 0x80 - active */
|
853 |
uint8_t head; /* starting head */
|
854 |
uint8_t sector; /* starting sector */
|
855 |
uint8_t cyl; /* starting cylinder */
|
856 |
uint8_t sys_ind; /* What partition type */
|
857 |
uint8_t end_head; /* end head */
|
858 |
uint8_t end_sector; /* end sector */
|
859 |
uint8_t end_cyl; /* end cylinder */
|
860 |
uint32_t start_sect; /* starting sector counting from 0 */
|
861 |
uint32_t nr_sects; /* nr of sectors in partition */
|
862 |
} __attribute__((packed)); |
863 |
|
864 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
865 |
static int guess_disk_lchs(BlockDriverState *bs, |
866 |
int *pcylinders, int *pheads, int *psectors) |
867 |
{ |
868 |
uint8_t buf[512];
|
869 |
int ret, i, heads, sectors, cylinders;
|
870 |
struct partition *p;
|
871 |
uint32_t nr_sects; |
872 |
uint64_t nb_sectors; |
873 |
|
874 |
bdrv_get_geometry(bs, &nb_sectors); |
875 |
|
876 |
ret = bdrv_read(bs, 0, buf, 1); |
877 |
if (ret < 0) |
878 |
return -1; |
879 |
/* test msdos magic */
|
880 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
881 |
return -1; |
882 |
for(i = 0; i < 4; i++) { |
883 |
p = ((struct partition *)(buf + 0x1be)) + i; |
884 |
nr_sects = le32_to_cpu(p->nr_sects); |
885 |
if (nr_sects && p->end_head) {
|
886 |
/* We make the assumption that the partition terminates on
|
887 |
a cylinder boundary */
|
888 |
heads = p->end_head + 1;
|
889 |
sectors = p->end_sector & 63;
|
890 |
if (sectors == 0) |
891 |
continue;
|
892 |
cylinders = nb_sectors / (heads * sectors); |
893 |
if (cylinders < 1 || cylinders > 16383) |
894 |
continue;
|
895 |
*pheads = heads; |
896 |
*psectors = sectors; |
897 |
*pcylinders = cylinders; |
898 |
#if 0
|
899 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
900 |
cylinders, heads, sectors);
|
901 |
#endif
|
902 |
return 0; |
903 |
} |
904 |
} |
905 |
return -1; |
906 |
} |
907 |
|
908 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
909 |
{ |
910 |
int translation, lba_detected = 0; |
911 |
int cylinders, heads, secs;
|
912 |
uint64_t nb_sectors; |
913 |
|
914 |
/* if a geometry hint is available, use it */
|
915 |
bdrv_get_geometry(bs, &nb_sectors); |
916 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
917 |
translation = bdrv_get_translation_hint(bs); |
918 |
if (cylinders != 0) { |
919 |
*pcyls = cylinders; |
920 |
*pheads = heads; |
921 |
*psecs = secs; |
922 |
} else {
|
923 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
924 |
if (heads > 16) { |
925 |
/* if heads > 16, it means that a BIOS LBA
|
926 |
translation was active, so the default
|
927 |
hardware geometry is OK */
|
928 |
lba_detected = 1;
|
929 |
goto default_geometry;
|
930 |
} else {
|
931 |
*pcyls = cylinders; |
932 |
*pheads = heads; |
933 |
*psecs = secs; |
934 |
/* disable any translation to be in sync with
|
935 |
the logical geometry */
|
936 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
937 |
bdrv_set_translation_hint(bs, |
938 |
BIOS_ATA_TRANSLATION_NONE); |
939 |
} |
940 |
} |
941 |
} else {
|
942 |
default_geometry:
|
943 |
/* if no geometry, use a standard physical disk geometry */
|
944 |
cylinders = nb_sectors / (16 * 63); |
945 |
|
946 |
if (cylinders > 16383) |
947 |
cylinders = 16383;
|
948 |
else if (cylinders < 2) |
949 |
cylinders = 2;
|
950 |
*pcyls = cylinders; |
951 |
*pheads = 16;
|
952 |
*psecs = 63;
|
953 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
954 |
if ((*pcyls * *pheads) <= 131072) { |
955 |
bdrv_set_translation_hint(bs, |
956 |
BIOS_ATA_TRANSLATION_LARGE); |
957 |
} else {
|
958 |
bdrv_set_translation_hint(bs, |
959 |
BIOS_ATA_TRANSLATION_LBA); |
960 |
} |
961 |
} |
962 |
} |
963 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
964 |
} |
965 |
} |
966 |
|
967 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
968 |
int cyls, int heads, int secs) |
969 |
{ |
970 |
bs->cyls = cyls; |
971 |
bs->heads = heads; |
972 |
bs->secs = secs; |
973 |
} |
974 |
|
975 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
976 |
{ |
977 |
bs->type = type; |
978 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
979 |
type == BDRV_TYPE_FLOPPY)); |
980 |
} |
981 |
|
982 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
983 |
{ |
984 |
bs->translation = translation; |
985 |
} |
986 |
|
987 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
988 |
int *pcyls, int *pheads, int *psecs) |
989 |
{ |
990 |
*pcyls = bs->cyls; |
991 |
*pheads = bs->heads; |
992 |
*psecs = bs->secs; |
993 |
} |
994 |
|
995 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
996 |
{ |
997 |
return bs->type;
|
998 |
} |
999 |
|
1000 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
1001 |
{ |
1002 |
return bs->translation;
|
1003 |
} |
1004 |
|
1005 |
int bdrv_is_removable(BlockDriverState *bs)
|
1006 |
{ |
1007 |
return bs->removable;
|
1008 |
} |
1009 |
|
1010 |
int bdrv_is_read_only(BlockDriverState *bs)
|
1011 |
{ |
1012 |
return bs->read_only;
|
1013 |
} |
1014 |
|
1015 |
int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
1016 |
{ |
1017 |
int ret = bs->read_only;
|
1018 |
bs->read_only = read_only; |
1019 |
return ret;
|
1020 |
} |
1021 |
|
1022 |
int bdrv_is_sg(BlockDriverState *bs)
|
1023 |
{ |
1024 |
return bs->sg;
|
1025 |
} |
1026 |
|
1027 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
1028 |
{ |
1029 |
return bs->enable_write_cache;
|
1030 |
} |
1031 |
|
1032 |
/* XXX: no longer used */
|
1033 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
1034 |
void (*change_cb)(void *opaque), void *opaque) |
1035 |
{ |
1036 |
bs->change_cb = change_cb; |
1037 |
bs->change_opaque = opaque; |
1038 |
} |
1039 |
|
1040 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
1041 |
{ |
1042 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1043 |
return 1; |
1044 |
return bs->encrypted;
|
1045 |
} |
1046 |
|
1047 |
int bdrv_key_required(BlockDriverState *bs)
|
1048 |
{ |
1049 |
BlockDriverState *backing_hd = bs->backing_hd; |
1050 |
|
1051 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1052 |
return 1; |
1053 |
return (bs->encrypted && !bs->valid_key);
|
1054 |
} |
1055 |
|
1056 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
1057 |
{ |
1058 |
int ret;
|
1059 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1060 |
ret = bdrv_set_key(bs->backing_hd, key); |
1061 |
if (ret < 0) |
1062 |
return ret;
|
1063 |
if (!bs->encrypted)
|
1064 |
return 0; |
1065 |
} |
1066 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
1067 |
return -1; |
1068 |
ret = bs->drv->bdrv_set_key(bs, key); |
1069 |
if (ret < 0) { |
1070 |
bs->valid_key = 0;
|
1071 |
} else if (!bs->valid_key) { |
1072 |
bs->valid_key = 1;
|
1073 |
/* call the change callback now, we skipped it on open */
|
1074 |
bs->media_changed = 1;
|
1075 |
if (bs->change_cb)
|
1076 |
bs->change_cb(bs->change_opaque); |
1077 |
} |
1078 |
return ret;
|
1079 |
} |
1080 |
|
1081 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1082 |
{ |
1083 |
if (!bs->drv) {
|
1084 |
buf[0] = '\0'; |
1085 |
} else {
|
1086 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
1087 |
} |
1088 |
} |
1089 |
|
1090 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1091 |
void *opaque)
|
1092 |
{ |
1093 |
BlockDriver *drv; |
1094 |
|
1095 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
1096 |
it(opaque, drv->format_name); |
1097 |
} |
1098 |
} |
1099 |
|
1100 |
BlockDriverState *bdrv_find(const char *name) |
1101 |
{ |
1102 |
BlockDriverState *bs; |
1103 |
|
1104 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1105 |
if (!strcmp(name, bs->device_name))
|
1106 |
return bs;
|
1107 |
} |
1108 |
return NULL; |
1109 |
} |
1110 |
|
1111 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1112 |
{ |
1113 |
BlockDriverState *bs; |
1114 |
|
1115 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1116 |
it(opaque, bs); |
1117 |
} |
1118 |
} |
1119 |
|
1120 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1121 |
{ |
1122 |
return bs->device_name;
|
1123 |
} |
1124 |
|
1125 |
void bdrv_flush(BlockDriverState *bs)
|
1126 |
{ |
1127 |
if (bs->drv && bs->drv->bdrv_flush)
|
1128 |
bs->drv->bdrv_flush(bs); |
1129 |
} |
1130 |
|
1131 |
void bdrv_flush_all(void) |
1132 |
{ |
1133 |
BlockDriverState *bs; |
1134 |
|
1135 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1136 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1137 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1138 |
bdrv_flush(bs); |
1139 |
} |
1140 |
|
1141 |
/*
|
1142 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1143 |
* not implementing the functionality are assumed to not support backing files,
|
1144 |
* hence all their sectors are reported as allocated.
|
1145 |
*
|
1146 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1147 |
* the specified sector) that are known to be in the same
|
1148 |
* allocated/unallocated state.
|
1149 |
*
|
1150 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1151 |
*/
|
1152 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1153 |
int *pnum)
|
1154 |
{ |
1155 |
int64_t n; |
1156 |
if (!bs->drv->bdrv_is_allocated) {
|
1157 |
if (sector_num >= bs->total_sectors) {
|
1158 |
*pnum = 0;
|
1159 |
return 0; |
1160 |
} |
1161 |
n = bs->total_sectors - sector_num; |
1162 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1163 |
return 1; |
1164 |
} |
1165 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1166 |
} |
1167 |
|
1168 |
static void bdrv_print_dict(QObject *obj, void *opaque) |
1169 |
{ |
1170 |
QDict *bs_dict; |
1171 |
Monitor *mon = opaque; |
1172 |
|
1173 |
bs_dict = qobject_to_qdict(obj); |
1174 |
|
1175 |
monitor_printf(mon, "%s: type=%s removable=%d",
|
1176 |
qdict_get_str(bs_dict, "device"),
|
1177 |
qdict_get_str(bs_dict, "type"),
|
1178 |
qdict_get_bool(bs_dict, "removable"));
|
1179 |
|
1180 |
if (qdict_get_bool(bs_dict, "removable")) { |
1181 |
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
1182 |
} |
1183 |
|
1184 |
if (qdict_haskey(bs_dict, "inserted")) { |
1185 |
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
1186 |
|
1187 |
monitor_printf(mon, " file=");
|
1188 |
monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
1189 |
if (qdict_haskey(qdict, "backing_file")) { |
1190 |
monitor_printf(mon, " backing_file=");
|
1191 |
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
1192 |
} |
1193 |
monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
1194 |
qdict_get_bool(qdict, "ro"),
|
1195 |
qdict_get_str(qdict, "drv"),
|
1196 |
qdict_get_bool(qdict, "encrypted"));
|
1197 |
} else {
|
1198 |
monitor_printf(mon, " [not inserted]");
|
1199 |
} |
1200 |
|
1201 |
monitor_printf(mon, "\n");
|
1202 |
} |
1203 |
|
1204 |
void bdrv_info_print(Monitor *mon, const QObject *data) |
1205 |
{ |
1206 |
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
1207 |
} |
1208 |
|
1209 |
/**
|
1210 |
* bdrv_info(): Block devices information
|
1211 |
*
|
1212 |
* Each block device information is stored in a QDict and the
|
1213 |
* returned QObject is a QList of all devices.
|
1214 |
*
|
1215 |
* The QDict contains the following:
|
1216 |
*
|
1217 |
* - "device": device name
|
1218 |
* - "type": device type
|
1219 |
* - "removable": true if the device is removable, false otherwise
|
1220 |
* - "locked": true if the device is locked, false otherwise
|
1221 |
* - "inserted": only present if the device is inserted, it is a QDict
|
1222 |
* containing the following:
|
1223 |
* - "file": device file name
|
1224 |
* - "ro": true if read-only, false otherwise
|
1225 |
* - "drv": driver format name
|
1226 |
* - "backing_file": backing file name if one is used
|
1227 |
* - "encrypted": true if encrypted, false otherwise
|
1228 |
*
|
1229 |
* Example:
|
1230 |
*
|
1231 |
* [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
|
1232 |
* "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
|
1233 |
* { "device": "floppy0", "type": "floppy", "removable": true,
|
1234 |
* "locked": false } ]
|
1235 |
*/
|
1236 |
void bdrv_info(Monitor *mon, QObject **ret_data)
|
1237 |
{ |
1238 |
QList *bs_list; |
1239 |
BlockDriverState *bs; |
1240 |
|
1241 |
bs_list = qlist_new(); |
1242 |
|
1243 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1244 |
QObject *bs_obj; |
1245 |
const char *type = "unknown"; |
1246 |
|
1247 |
switch(bs->type) {
|
1248 |
case BDRV_TYPE_HD:
|
1249 |
type = "hd";
|
1250 |
break;
|
1251 |
case BDRV_TYPE_CDROM:
|
1252 |
type = "cdrom";
|
1253 |
break;
|
1254 |
case BDRV_TYPE_FLOPPY:
|
1255 |
type = "floppy";
|
1256 |
break;
|
1257 |
} |
1258 |
|
1259 |
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
|
1260 |
"'removable': %i, 'locked': %i }",
|
1261 |
bs->device_name, type, bs->removable, |
1262 |
bs->locked); |
1263 |
assert(bs_obj != NULL);
|
1264 |
|
1265 |
if (bs->drv) {
|
1266 |
QObject *obj; |
1267 |
QDict *bs_dict = qobject_to_qdict(bs_obj); |
1268 |
|
1269 |
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
1270 |
"'encrypted': %i }",
|
1271 |
bs->filename, bs->read_only, |
1272 |
bs->drv->format_name, |
1273 |
bdrv_is_encrypted(bs)); |
1274 |
assert(obj != NULL);
|
1275 |
if (bs->backing_file[0] != '\0') { |
1276 |
QDict *qdict = qobject_to_qdict(obj); |
1277 |
qdict_put(qdict, "backing_file",
|
1278 |
qstring_from_str(bs->backing_file)); |
1279 |
} |
1280 |
|
1281 |
qdict_put_obj(bs_dict, "inserted", obj);
|
1282 |
} |
1283 |
qlist_append_obj(bs_list, bs_obj); |
1284 |
} |
1285 |
|
1286 |
*ret_data = QOBJECT(bs_list); |
1287 |
} |
1288 |
|
1289 |
static void bdrv_stats_iter(QObject *data, void *opaque) |
1290 |
{ |
1291 |
QDict *qdict; |
1292 |
Monitor *mon = opaque; |
1293 |
|
1294 |
qdict = qobject_to_qdict(data); |
1295 |
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
1296 |
|
1297 |
qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
1298 |
monitor_printf(mon, " rd_bytes=%" PRId64
|
1299 |
" wr_bytes=%" PRId64
|
1300 |
" rd_operations=%" PRId64
|
1301 |
" wr_operations=%" PRId64
|
1302 |
"\n",
|
1303 |
qdict_get_int(qdict, "rd_bytes"),
|
1304 |
qdict_get_int(qdict, "wr_bytes"),
|
1305 |
qdict_get_int(qdict, "rd_operations"),
|
1306 |
qdict_get_int(qdict, "wr_operations"));
|
1307 |
} |
1308 |
|
1309 |
void bdrv_stats_print(Monitor *mon, const QObject *data) |
1310 |
{ |
1311 |
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
1312 |
} |
1313 |
|
1314 |
/**
|
1315 |
* bdrv_info_stats(): show block device statistics
|
1316 |
*
|
1317 |
* Each device statistic information is stored in a QDict and
|
1318 |
* the returned QObject is a QList of all devices.
|
1319 |
*
|
1320 |
* The QDict contains the following:
|
1321 |
*
|
1322 |
* - "device": device name
|
1323 |
* - "stats": A QDict with the statistics information, it contains:
|
1324 |
* - "rd_bytes": bytes read
|
1325 |
* - "wr_bytes": bytes written
|
1326 |
* - "rd_operations": read operations
|
1327 |
* - "wr_operations": write operations
|
1328 |
*
|
1329 |
* Example:
|
1330 |
*
|
1331 |
* [ { "device": "ide0-hd0",
|
1332 |
* "stats": { "rd_bytes": 512,
|
1333 |
* "wr_bytes": 0,
|
1334 |
* "rd_operations": 1,
|
1335 |
* "wr_operations": 0 } },
|
1336 |
* { "device": "ide1-cd0",
|
1337 |
* "stats": { "rd_bytes": 0,
|
1338 |
* "wr_bytes": 0,
|
1339 |
* "rd_operations": 0,
|
1340 |
* "wr_operations": 0 } } ]
|
1341 |
*/
|
1342 |
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
1343 |
{ |
1344 |
QObject *obj; |
1345 |
QList *devices; |
1346 |
BlockDriverState *bs; |
1347 |
|
1348 |
devices = qlist_new(); |
1349 |
|
1350 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1351 |
obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
|
1352 |
"'rd_bytes': %" PRId64 "," |
1353 |
"'wr_bytes': %" PRId64 "," |
1354 |
"'rd_operations': %" PRId64 "," |
1355 |
"'wr_operations': %" PRId64
|
1356 |
"} }",
|
1357 |
bs->device_name, |
1358 |
bs->rd_bytes, bs->wr_bytes, |
1359 |
bs->rd_ops, bs->wr_ops); |
1360 |
assert(obj != NULL);
|
1361 |
qlist_append_obj(devices, obj); |
1362 |
} |
1363 |
|
1364 |
*ret_data = QOBJECT(devices); |
1365 |
} |
1366 |
|
1367 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1368 |
{ |
1369 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1370 |
return bs->backing_file;
|
1371 |
else if (bs->encrypted) |
1372 |
return bs->filename;
|
1373 |
else
|
1374 |
return NULL; |
1375 |
} |
1376 |
|
1377 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1378 |
char *filename, int filename_size) |
1379 |
{ |
1380 |
if (!bs->backing_file) {
|
1381 |
pstrcpy(filename, filename_size, "");
|
1382 |
} else {
|
1383 |
pstrcpy(filename, filename_size, bs->backing_file); |
1384 |
} |
1385 |
} |
1386 |
|
1387 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1388 |
const uint8_t *buf, int nb_sectors) |
1389 |
{ |
1390 |
BlockDriver *drv = bs->drv; |
1391 |
if (!drv)
|
1392 |
return -ENOMEDIUM;
|
1393 |
if (!drv->bdrv_write_compressed)
|
1394 |
return -ENOTSUP;
|
1395 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1396 |
return -EIO;
|
1397 |
|
1398 |
if (bs->dirty_bitmap) {
|
1399 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1400 |
} |
1401 |
|
1402 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1403 |
} |
1404 |
|
1405 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1406 |
{ |
1407 |
BlockDriver *drv = bs->drv; |
1408 |
if (!drv)
|
1409 |
return -ENOMEDIUM;
|
1410 |
if (!drv->bdrv_get_info)
|
1411 |
return -ENOTSUP;
|
1412 |
memset(bdi, 0, sizeof(*bdi)); |
1413 |
return drv->bdrv_get_info(bs, bdi);
|
1414 |
} |
1415 |
|
1416 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1417 |
int64_t pos, int size)
|
1418 |
{ |
1419 |
BlockDriver *drv = bs->drv; |
1420 |
if (!drv)
|
1421 |
return -ENOMEDIUM;
|
1422 |
if (!drv->bdrv_save_vmstate)
|
1423 |
return -ENOTSUP;
|
1424 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1425 |
} |
1426 |
|
1427 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1428 |
int64_t pos, int size)
|
1429 |
{ |
1430 |
BlockDriver *drv = bs->drv; |
1431 |
if (!drv)
|
1432 |
return -ENOMEDIUM;
|
1433 |
if (!drv->bdrv_load_vmstate)
|
1434 |
return -ENOTSUP;
|
1435 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1436 |
} |
1437 |
|
1438 |
/**************************************************************/
|
1439 |
/* handling of snapshots */
|
1440 |
|
1441 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1442 |
QEMUSnapshotInfo *sn_info) |
1443 |
{ |
1444 |
BlockDriver *drv = bs->drv; |
1445 |
if (!drv)
|
1446 |
return -ENOMEDIUM;
|
1447 |
if (!drv->bdrv_snapshot_create)
|
1448 |
return -ENOTSUP;
|
1449 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1450 |
} |
1451 |
|
1452 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1453 |
const char *snapshot_id) |
1454 |
{ |
1455 |
BlockDriver *drv = bs->drv; |
1456 |
if (!drv)
|
1457 |
return -ENOMEDIUM;
|
1458 |
if (!drv->bdrv_snapshot_goto)
|
1459 |
return -ENOTSUP;
|
1460 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1461 |
} |
1462 |
|
1463 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1464 |
{ |
1465 |
BlockDriver *drv = bs->drv; |
1466 |
if (!drv)
|
1467 |
return -ENOMEDIUM;
|
1468 |
if (!drv->bdrv_snapshot_delete)
|
1469 |
return -ENOTSUP;
|
1470 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1471 |
} |
1472 |
|
1473 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1474 |
QEMUSnapshotInfo **psn_info) |
1475 |
{ |
1476 |
BlockDriver *drv = bs->drv; |
1477 |
if (!drv)
|
1478 |
return -ENOMEDIUM;
|
1479 |
if (!drv->bdrv_snapshot_list)
|
1480 |
return -ENOTSUP;
|
1481 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1482 |
} |
1483 |
|
1484 |
#define NB_SUFFIXES 4 |
1485 |
|
1486 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1487 |
{ |
1488 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1489 |
int64_t base; |
1490 |
int i;
|
1491 |
|
1492 |
if (size <= 999) { |
1493 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1494 |
} else {
|
1495 |
base = 1024;
|
1496 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1497 |
if (size < (10 * base)) { |
1498 |
snprintf(buf, buf_size, "%0.1f%c",
|
1499 |
(double)size / base,
|
1500 |
suffixes[i]); |
1501 |
break;
|
1502 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1503 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1504 |
((size + (base >> 1)) / base),
|
1505 |
suffixes[i]); |
1506 |
break;
|
1507 |
} |
1508 |
base = base * 1024;
|
1509 |
} |
1510 |
} |
1511 |
return buf;
|
1512 |
} |
1513 |
|
1514 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1515 |
{ |
1516 |
char buf1[128], date_buf[128], clock_buf[128]; |
1517 |
#ifdef _WIN32
|
1518 |
struct tm *ptm;
|
1519 |
#else
|
1520 |
struct tm tm;
|
1521 |
#endif
|
1522 |
time_t ti; |
1523 |
int64_t secs; |
1524 |
|
1525 |
if (!sn) {
|
1526 |
snprintf(buf, buf_size, |
1527 |
"%-10s%-20s%7s%20s%15s",
|
1528 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1529 |
} else {
|
1530 |
ti = sn->date_sec; |
1531 |
#ifdef _WIN32
|
1532 |
ptm = localtime(&ti); |
1533 |
strftime(date_buf, sizeof(date_buf),
|
1534 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1535 |
#else
|
1536 |
localtime_r(&ti, &tm); |
1537 |
strftime(date_buf, sizeof(date_buf),
|
1538 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1539 |
#endif
|
1540 |
secs = sn->vm_clock_nsec / 1000000000;
|
1541 |
snprintf(clock_buf, sizeof(clock_buf),
|
1542 |
"%02d:%02d:%02d.%03d",
|
1543 |
(int)(secs / 3600), |
1544 |
(int)((secs / 60) % 60), |
1545 |
(int)(secs % 60), |
1546 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1547 |
snprintf(buf, buf_size, |
1548 |
"%-10s%-20s%7s%20s%15s",
|
1549 |
sn->id_str, sn->name, |
1550 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1551 |
date_buf, |
1552 |
clock_buf); |
1553 |
} |
1554 |
return buf;
|
1555 |
} |
1556 |
|
1557 |
|
1558 |
/**************************************************************/
|
1559 |
/* async I/Os */
|
1560 |
|
1561 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1562 |
QEMUIOVector *qiov, int nb_sectors,
|
1563 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1564 |
{ |
1565 |
BlockDriver *drv = bs->drv; |
1566 |
BlockDriverAIOCB *ret; |
1567 |
|
1568 |
if (!drv)
|
1569 |
return NULL; |
1570 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1571 |
return NULL; |
1572 |
|
1573 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1574 |
cb, opaque); |
1575 |
|
1576 |
if (ret) {
|
1577 |
/* Update stats even though technically transfer has not happened. */
|
1578 |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1579 |
bs->rd_ops ++; |
1580 |
} |
1581 |
|
1582 |
return ret;
|
1583 |
} |
1584 |
|
1585 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1586 |
QEMUIOVector *qiov, int nb_sectors,
|
1587 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1588 |
{ |
1589 |
BlockDriver *drv = bs->drv; |
1590 |
BlockDriverAIOCB *ret; |
1591 |
|
1592 |
if (!drv)
|
1593 |
return NULL; |
1594 |
if (bs->read_only)
|
1595 |
return NULL; |
1596 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1597 |
return NULL; |
1598 |
|
1599 |
if (bs->dirty_bitmap) {
|
1600 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1601 |
} |
1602 |
|
1603 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1604 |
cb, opaque); |
1605 |
|
1606 |
if (ret) {
|
1607 |
/* Update stats even though technically transfer has not happened. */
|
1608 |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1609 |
bs->wr_ops ++; |
1610 |
} |
1611 |
|
1612 |
return ret;
|
1613 |
} |
1614 |
|
1615 |
|
1616 |
typedef struct MultiwriteCB { |
1617 |
int error;
|
1618 |
int num_requests;
|
1619 |
int num_callbacks;
|
1620 |
struct {
|
1621 |
BlockDriverCompletionFunc *cb; |
1622 |
void *opaque;
|
1623 |
QEMUIOVector *free_qiov; |
1624 |
void *free_buf;
|
1625 |
} callbacks[]; |
1626 |
} MultiwriteCB; |
1627 |
|
1628 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
1629 |
{ |
1630 |
int i;
|
1631 |
|
1632 |
for (i = 0; i < mcb->num_callbacks; i++) { |
1633 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1634 |
qemu_free(mcb->callbacks[i].free_qiov); |
1635 |
qemu_free(mcb->callbacks[i].free_buf); |
1636 |
} |
1637 |
} |
1638 |
|
1639 |
static void multiwrite_cb(void *opaque, int ret) |
1640 |
{ |
1641 |
MultiwriteCB *mcb = opaque; |
1642 |
|
1643 |
if (ret < 0) { |
1644 |
mcb->error = ret; |
1645 |
multiwrite_user_cb(mcb); |
1646 |
} |
1647 |
|
1648 |
mcb->num_requests--; |
1649 |
if (mcb->num_requests == 0) { |
1650 |
if (mcb->error == 0) { |
1651 |
multiwrite_user_cb(mcb); |
1652 |
} |
1653 |
qemu_free(mcb); |
1654 |
} |
1655 |
} |
1656 |
|
1657 |
static int multiwrite_req_compare(const void *a, const void *b) |
1658 |
{ |
1659 |
return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
1660 |
} |
1661 |
|
1662 |
/*
|
1663 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
1664 |
* requests that remain after merging.
|
1665 |
*/
|
1666 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1667 |
int num_reqs, MultiwriteCB *mcb)
|
1668 |
{ |
1669 |
int i, outidx;
|
1670 |
|
1671 |
// Sort requests by start sector
|
1672 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1673 |
|
1674 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
1675 |
// filling up gaps with zero sectors.
|
1676 |
outidx = 0;
|
1677 |
for (i = 1; i < num_reqs; i++) { |
1678 |
int merge = 0; |
1679 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1680 |
|
1681 |
// This handles the cases that are valid for all block drivers, namely
|
1682 |
// exactly sequential writes and overlapping writes.
|
1683 |
if (reqs[i].sector <= oldreq_last) {
|
1684 |
merge = 1;
|
1685 |
} |
1686 |
|
1687 |
// The block driver may decide that it makes sense to combine requests
|
1688 |
// even if there is a gap of some sectors between them. In this case,
|
1689 |
// the gap is filled with zeros (therefore only applicable for yet
|
1690 |
// unused space in format like qcow2).
|
1691 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
1692 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1693 |
} |
1694 |
|
1695 |
if (merge) {
|
1696 |
size_t size; |
1697 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
1698 |
qemu_iovec_init(qiov, |
1699 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
1700 |
|
1701 |
// Add the first request to the merged one. If the requests are
|
1702 |
// overlapping, drop the last sectors of the first request.
|
1703 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
1704 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
1705 |
|
1706 |
// We might need to add some zeros between the two requests
|
1707 |
if (reqs[i].sector > oldreq_last) {
|
1708 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
1709 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
1710 |
memset(buf, 0, zero_bytes);
|
1711 |
qemu_iovec_add(qiov, buf, zero_bytes); |
1712 |
mcb->callbacks[i].free_buf = buf; |
1713 |
} |
1714 |
|
1715 |
// Add the second request
|
1716 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
1717 |
|
1718 |
reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
1719 |
reqs[outidx].qiov = qiov; |
1720 |
|
1721 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
1722 |
} else {
|
1723 |
outidx++; |
1724 |
reqs[outidx].sector = reqs[i].sector; |
1725 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
1726 |
reqs[outidx].qiov = reqs[i].qiov; |
1727 |
} |
1728 |
} |
1729 |
|
1730 |
return outidx + 1; |
1731 |
} |
1732 |
|
1733 |
/*
|
1734 |
* Submit multiple AIO write requests at once.
|
1735 |
*
|
1736 |
* On success, the function returns 0 and all requests in the reqs array have
|
1737 |
* been submitted. In error case this function returns -1, and any of the
|
1738 |
* requests may or may not be submitted yet. In particular, this means that the
|
1739 |
* callback will be called for some of the requests, for others it won't. The
|
1740 |
* caller must check the error field of the BlockRequest to wait for the right
|
1741 |
* callbacks (if error != 0, no callback will be called).
|
1742 |
*
|
1743 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
1744 |
* requests. However, the fields opaque and error are left unmodified as they
|
1745 |
* are used to signal failure for a single request to the caller.
|
1746 |
*/
|
1747 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
1748 |
{ |
1749 |
BlockDriverAIOCB *acb; |
1750 |
MultiwriteCB *mcb; |
1751 |
int i;
|
1752 |
|
1753 |
if (num_reqs == 0) { |
1754 |
return 0; |
1755 |
} |
1756 |
|
1757 |
// Create MultiwriteCB structure
|
1758 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
1759 |
mcb->num_requests = 0;
|
1760 |
mcb->num_callbacks = num_reqs; |
1761 |
|
1762 |
for (i = 0; i < num_reqs; i++) { |
1763 |
mcb->callbacks[i].cb = reqs[i].cb; |
1764 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
1765 |
} |
1766 |
|
1767 |
// Check for mergable requests
|
1768 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
1769 |
|
1770 |
// Run the aio requests
|
1771 |
for (i = 0; i < num_reqs; i++) { |
1772 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
1773 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
1774 |
|
1775 |
if (acb == NULL) { |
1776 |
// We can only fail the whole thing if no request has been
|
1777 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
1778 |
// complete and report the error in the callback.
|
1779 |
if (mcb->num_requests == 0) { |
1780 |
reqs[i].error = EIO; |
1781 |
goto fail;
|
1782 |
} else {
|
1783 |
mcb->error = EIO; |
1784 |
break;
|
1785 |
} |
1786 |
} else {
|
1787 |
mcb->num_requests++; |
1788 |
} |
1789 |
} |
1790 |
|
1791 |
return 0; |
1792 |
|
1793 |
fail:
|
1794 |
free(mcb); |
1795 |
return -1; |
1796 |
} |
1797 |
|
1798 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1799 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1800 |
{ |
1801 |
BlockDriver *drv = bs->drv; |
1802 |
|
1803 |
if (!drv)
|
1804 |
return NULL; |
1805 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
1806 |
} |
1807 |
|
1808 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1809 |
{ |
1810 |
acb->pool->cancel(acb); |
1811 |
} |
1812 |
|
1813 |
|
1814 |
/**************************************************************/
|
1815 |
/* async block device emulation */
|
1816 |
|
1817 |
typedef struct BlockDriverAIOCBSync { |
1818 |
BlockDriverAIOCB common; |
1819 |
QEMUBH *bh; |
1820 |
int ret;
|
1821 |
/* vector translation state */
|
1822 |
QEMUIOVector *qiov; |
1823 |
uint8_t *bounce; |
1824 |
int is_write;
|
1825 |
} BlockDriverAIOCBSync; |
1826 |
|
1827 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1828 |
{ |
1829 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1830 |
qemu_bh_delete(acb->bh); |
1831 |
acb->bh = NULL;
|
1832 |
qemu_aio_release(acb); |
1833 |
} |
1834 |
|
1835 |
static AIOPool bdrv_em_aio_pool = {
|
1836 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
1837 |
.cancel = bdrv_aio_cancel_em, |
1838 |
}; |
1839 |
|
1840 |
static void bdrv_aio_bh_cb(void *opaque) |
1841 |
{ |
1842 |
BlockDriverAIOCBSync *acb = opaque; |
1843 |
|
1844 |
if (!acb->is_write)
|
1845 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
1846 |
qemu_vfree(acb->bounce); |
1847 |
acb->common.cb(acb->common.opaque, acb->ret); |
1848 |
qemu_bh_delete(acb->bh); |
1849 |
acb->bh = NULL;
|
1850 |
qemu_aio_release(acb); |
1851 |
} |
1852 |
|
1853 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1854 |
int64_t sector_num, |
1855 |
QEMUIOVector *qiov, |
1856 |
int nb_sectors,
|
1857 |
BlockDriverCompletionFunc *cb, |
1858 |
void *opaque,
|
1859 |
int is_write)
|
1860 |
|
1861 |
{ |
1862 |
BlockDriverAIOCBSync *acb; |
1863 |
|
1864 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1865 |
acb->is_write = is_write; |
1866 |
acb->qiov = qiov; |
1867 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
1868 |
|
1869 |
if (!acb->bh)
|
1870 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1871 |
|
1872 |
if (is_write) {
|
1873 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
1874 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
1875 |
} else {
|
1876 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
1877 |
} |
1878 |
|
1879 |
qemu_bh_schedule(acb->bh); |
1880 |
|
1881 |
return &acb->common;
|
1882 |
} |
1883 |
|
1884 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
1885 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1886 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1887 |
{ |
1888 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1889 |
} |
1890 |
|
1891 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
1892 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1893 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1894 |
{ |
1895 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
1896 |
} |
1897 |
|
1898 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
1899 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1900 |
{ |
1901 |
BlockDriverAIOCBSync *acb; |
1902 |
|
1903 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1904 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
1905 |
acb->qiov = NULL;
|
1906 |
acb->bounce = NULL;
|
1907 |
acb->ret = 0;
|
1908 |
|
1909 |
if (!acb->bh)
|
1910 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1911 |
|
1912 |
bdrv_flush(bs); |
1913 |
qemu_bh_schedule(acb->bh); |
1914 |
return &acb->common;
|
1915 |
} |
1916 |
|
1917 |
/**************************************************************/
|
1918 |
/* sync block device emulation */
|
1919 |
|
1920 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1921 |
{ |
1922 |
*(int *)opaque = ret;
|
1923 |
} |
1924 |
|
1925 |
#define NOT_DONE 0x7fffffff |
1926 |
|
1927 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1928 |
uint8_t *buf, int nb_sectors)
|
1929 |
{ |
1930 |
int async_ret;
|
1931 |
BlockDriverAIOCB *acb; |
1932 |
struct iovec iov;
|
1933 |
QEMUIOVector qiov; |
1934 |
|
1935 |
async_context_push(); |
1936 |
|
1937 |
async_ret = NOT_DONE; |
1938 |
iov.iov_base = (void *)buf;
|
1939 |
iov.iov_len = nb_sectors * 512;
|
1940 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1941 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
1942 |
bdrv_rw_em_cb, &async_ret); |
1943 |
if (acb == NULL) { |
1944 |
async_ret = -1;
|
1945 |
goto fail;
|
1946 |
} |
1947 |
|
1948 |
while (async_ret == NOT_DONE) {
|
1949 |
qemu_aio_wait(); |
1950 |
} |
1951 |
|
1952 |
|
1953 |
fail:
|
1954 |
async_context_pop(); |
1955 |
return async_ret;
|
1956 |
} |
1957 |
|
1958 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1959 |
const uint8_t *buf, int nb_sectors) |
1960 |
{ |
1961 |
int async_ret;
|
1962 |
BlockDriverAIOCB *acb; |
1963 |
struct iovec iov;
|
1964 |
QEMUIOVector qiov; |
1965 |
|
1966 |
async_context_push(); |
1967 |
|
1968 |
async_ret = NOT_DONE; |
1969 |
iov.iov_base = (void *)buf;
|
1970 |
iov.iov_len = nb_sectors * 512;
|
1971 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1972 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
1973 |
bdrv_rw_em_cb, &async_ret); |
1974 |
if (acb == NULL) { |
1975 |
async_ret = -1;
|
1976 |
goto fail;
|
1977 |
} |
1978 |
while (async_ret == NOT_DONE) {
|
1979 |
qemu_aio_wait(); |
1980 |
} |
1981 |
|
1982 |
fail:
|
1983 |
async_context_pop(); |
1984 |
return async_ret;
|
1985 |
} |
1986 |
|
1987 |
void bdrv_init(void) |
1988 |
{ |
1989 |
module_call_init(MODULE_INIT_BLOCK); |
1990 |
} |
1991 |
|
1992 |
void bdrv_init_with_whitelist(void) |
1993 |
{ |
1994 |
use_bdrv_whitelist = 1;
|
1995 |
bdrv_init(); |
1996 |
} |
1997 |
|
1998 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
1999 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2000 |
{ |
2001 |
BlockDriverAIOCB *acb; |
2002 |
|
2003 |
if (pool->free_aiocb) {
|
2004 |
acb = pool->free_aiocb; |
2005 |
pool->free_aiocb = acb->next; |
2006 |
} else {
|
2007 |
acb = qemu_mallocz(pool->aiocb_size); |
2008 |
acb->pool = pool; |
2009 |
} |
2010 |
acb->bs = bs; |
2011 |
acb->cb = cb; |
2012 |
acb->opaque = opaque; |
2013 |
return acb;
|
2014 |
} |
2015 |
|
2016 |
void qemu_aio_release(void *p) |
2017 |
{ |
2018 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2019 |
AIOPool *pool = acb->pool; |
2020 |
acb->next = pool->free_aiocb; |
2021 |
pool->free_aiocb = acb; |
2022 |
} |
2023 |
|
2024 |
/**************************************************************/
|
2025 |
/* removable device support */
|
2026 |
|
2027 |
/**
|
2028 |
* Return TRUE if the media is present
|
2029 |
*/
|
2030 |
int bdrv_is_inserted(BlockDriverState *bs)
|
2031 |
{ |
2032 |
BlockDriver *drv = bs->drv; |
2033 |
int ret;
|
2034 |
if (!drv)
|
2035 |
return 0; |
2036 |
if (!drv->bdrv_is_inserted)
|
2037 |
return 1; |
2038 |
ret = drv->bdrv_is_inserted(bs); |
2039 |
return ret;
|
2040 |
} |
2041 |
|
2042 |
/**
|
2043 |
* Return TRUE if the media changed since the last call to this
|
2044 |
* function. It is currently only used for floppy disks
|
2045 |
*/
|
2046 |
int bdrv_media_changed(BlockDriverState *bs)
|
2047 |
{ |
2048 |
BlockDriver *drv = bs->drv; |
2049 |
int ret;
|
2050 |
|
2051 |
if (!drv || !drv->bdrv_media_changed)
|
2052 |
ret = -ENOTSUP; |
2053 |
else
|
2054 |
ret = drv->bdrv_media_changed(bs); |
2055 |
if (ret == -ENOTSUP)
|
2056 |
ret = bs->media_changed; |
2057 |
bs->media_changed = 0;
|
2058 |
return ret;
|
2059 |
} |
2060 |
|
2061 |
/**
|
2062 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
2063 |
*/
|
2064 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
2065 |
{ |
2066 |
BlockDriver *drv = bs->drv; |
2067 |
int ret;
|
2068 |
|
2069 |
if (bs->locked) {
|
2070 |
return -EBUSY;
|
2071 |
} |
2072 |
|
2073 |
if (!drv || !drv->bdrv_eject) {
|
2074 |
ret = -ENOTSUP; |
2075 |
} else {
|
2076 |
ret = drv->bdrv_eject(bs, eject_flag); |
2077 |
} |
2078 |
if (ret == -ENOTSUP) {
|
2079 |
if (eject_flag)
|
2080 |
bdrv_close(bs); |
2081 |
ret = 0;
|
2082 |
} |
2083 |
|
2084 |
return ret;
|
2085 |
} |
2086 |
|
2087 |
int bdrv_is_locked(BlockDriverState *bs)
|
2088 |
{ |
2089 |
return bs->locked;
|
2090 |
} |
2091 |
|
2092 |
/**
|
2093 |
* Lock or unlock the media (if it is locked, the user won't be able
|
2094 |
* to eject it manually).
|
2095 |
*/
|
2096 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
2097 |
{ |
2098 |
BlockDriver *drv = bs->drv; |
2099 |
|
2100 |
bs->locked = locked; |
2101 |
if (drv && drv->bdrv_set_locked) {
|
2102 |
drv->bdrv_set_locked(bs, locked); |
2103 |
} |
2104 |
} |
2105 |
|
2106 |
/* needed for generic scsi interface */
|
2107 |
|
2108 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
2109 |
{ |
2110 |
BlockDriver *drv = bs->drv; |
2111 |
|
2112 |
if (drv && drv->bdrv_ioctl)
|
2113 |
return drv->bdrv_ioctl(bs, req, buf);
|
2114 |
return -ENOTSUP;
|
2115 |
} |
2116 |
|
2117 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2118 |
unsigned long int req, void *buf, |
2119 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2120 |
{ |
2121 |
BlockDriver *drv = bs->drv; |
2122 |
|
2123 |
if (drv && drv->bdrv_aio_ioctl)
|
2124 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
2125 |
return NULL; |
2126 |
} |
2127 |
|
2128 |
|
2129 |
|
2130 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
2131 |
{ |
2132 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
2133 |
} |
2134 |
|
2135 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
2136 |
{ |
2137 |
int64_t bitmap_size; |
2138 |
|
2139 |
if (enable) {
|
2140 |
if (!bs->dirty_bitmap) {
|
2141 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
2142 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
2143 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
2144 |
|
2145 |
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
2146 |
} |
2147 |
} else {
|
2148 |
if (bs->dirty_bitmap) {
|
2149 |
qemu_free(bs->dirty_bitmap); |
2150 |
bs->dirty_bitmap = NULL;
|
2151 |
} |
2152 |
} |
2153 |
} |
2154 |
|
2155 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
2156 |
{ |
2157 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
2158 |
|
2159 |
if (bs->dirty_bitmap &&
|
2160 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
2161 |
return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
2162 |
(1 << (chunk % (sizeof(unsigned long) * 8))); |
2163 |
} else {
|
2164 |
return 0; |
2165 |
} |
2166 |
} |
2167 |
|
2168 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2169 |
int nr_sectors)
|
2170 |
{ |
2171 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2172 |
} |