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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" |
28 |
#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> |
43 |
#endif
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|
45 |
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 |
static BlockDriver *find_protocol(const char *filename); |
58 |
|
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static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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QTAILQ_HEAD_INITIALIZER(bdrv_states); |
61 |
|
62 |
static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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QLIST_HEAD_INITIALIZER(bdrv_drivers); |
64 |
|
65 |
/* If non-zero, use only whitelisted block drivers */
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static int use_bdrv_whitelist; |
67 |
|
68 |
int path_is_absolute(const char *path) |
69 |
{ |
70 |
const char *p; |
71 |
#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; |
75 |
#endif
|
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p = strchr(path, ':');
|
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if (p)
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p++; |
79 |
else
|
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p = path; |
81 |
#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
83 |
#else
|
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return (*p == '/'); |
85 |
#endif
|
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} |
87 |
|
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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) |
94 |
{ |
95 |
const char *p, *p1; |
96 |
int len;
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97 |
|
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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); |
102 |
} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
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else
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p = base_path; |
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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; |
115 |
} |
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#endif
|
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if (p1)
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p1++; |
119 |
else
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p1 = base_path; |
121 |
if (p1 > p)
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p = p1; |
123 |
len = p - base_path; |
124 |
if (len > dest_size - 1) |
125 |
len = dest_size - 1;
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memcpy(dest, base_path, len); |
127 |
dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
129 |
} |
130 |
} |
131 |
|
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void bdrv_register(BlockDriver *bdrv)
|
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{ |
134 |
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; |
137 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
138 |
} else if (!bdrv->bdrv_read) { |
139 |
/* add synchronous IO emulation layer */
|
140 |
bdrv->bdrv_read = bdrv_read_em; |
141 |
bdrv->bdrv_write = bdrv_write_em; |
142 |
} |
143 |
|
144 |
if (!bdrv->bdrv_aio_flush)
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
146 |
|
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QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
148 |
} |
149 |
|
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/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name) |
152 |
{ |
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BlockDriverState *bs; |
154 |
|
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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') { |
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QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
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} |
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return bs;
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} |
162 |
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BlockDriver *bdrv_find_format(const char *format_name) |
164 |
{ |
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BlockDriver *drv1; |
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QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
167 |
if (!strcmp(drv1->format_name, format_name)) {
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return drv1;
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} |
170 |
} |
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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 |
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}; |
179 |
const char **p; |
180 |
|
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if (!whitelist[0]) |
182 |
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) |
193 |
{ |
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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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int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
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{ |
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BlockDriver *drv; |
210 |
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drv = find_protocol(filename); |
212 |
if (drv == NULL) { |
213 |
drv = bdrv_find_format("file");
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} |
215 |
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return bdrv_create(drv, filename, options);
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} |
218 |
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
221 |
{ |
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char temp_dir[MAX_PATH];
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223 |
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GetTempPath(MAX_PATH, temp_dir); |
225 |
GetTempFileName(temp_dir, "qem", 0, filename); |
226 |
} |
227 |
#else
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void get_tmp_filename(char *filename, int size) |
229 |
{ |
230 |
int fd;
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const char *tmpdir; |
232 |
/* 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); |
238 |
close(fd); |
239 |
} |
240 |
#endif
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241 |
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242 |
#ifdef _WIN32
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243 |
static int is_windows_drive_prefix(const char *filename) |
244 |
{ |
245 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
246 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
247 |
filename[1] == ':'); |
248 |
} |
249 |
|
250 |
int is_windows_drive(const char *filename) |
251 |
{ |
252 |
if (is_windows_drive_prefix(filename) &&
|
253 |
filename[2] == '\0') |
254 |
return 1; |
255 |
if (strstart(filename, "\\\\.\\", NULL) || |
256 |
strstart(filename, "//./", NULL)) |
257 |
return 1; |
258 |
return 0; |
259 |
} |
260 |
#endif
|
261 |
|
262 |
/*
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263 |
* Detect host devices. By convention, /dev/cdrom[N] is always
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264 |
* recognized as a host CDROM.
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*/
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static BlockDriver *find_hdev_driver(const char *filename) |
267 |
{ |
268 |
int score_max = 0, score; |
269 |
BlockDriver *drv = NULL, *d;
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270 |
|
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QLIST_FOREACH(d, &bdrv_drivers, list) { |
272 |
if (d->bdrv_probe_device) {
|
273 |
score = d->bdrv_probe_device(filename); |
274 |
if (score > score_max) {
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275 |
score_max = score; |
276 |
drv = d; |
277 |
} |
278 |
} |
279 |
} |
280 |
|
281 |
return drv;
|
282 |
} |
283 |
|
284 |
static BlockDriver *find_protocol(const char *filename) |
285 |
{ |
286 |
BlockDriver *drv1; |
287 |
char protocol[128]; |
288 |
int len;
|
289 |
const char *p; |
290 |
int is_drive;
|
291 |
|
292 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */
|
293 |
|
294 |
#ifdef _WIN32
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295 |
is_drive = is_windows_drive(filename) || |
296 |
is_windows_drive_prefix(filename); |
297 |
#else
|
298 |
is_drive = 0;
|
299 |
#endif
|
300 |
p = strchr(filename, ':');
|
301 |
if (!p || is_drive) {
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302 |
drv1 = find_hdev_driver(filename); |
303 |
if (!drv1) {
|
304 |
drv1 = bdrv_find_format("file");
|
305 |
} |
306 |
return drv1;
|
307 |
} |
308 |
len = p - filename; |
309 |
if (len > sizeof(protocol) - 1) |
310 |
len = sizeof(protocol) - 1; |
311 |
memcpy(protocol, filename, len); |
312 |
protocol[len] = '\0';
|
313 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
314 |
if (drv1->protocol_name &&
|
315 |
!strcmp(drv1->protocol_name, protocol)) { |
316 |
return drv1;
|
317 |
} |
318 |
} |
319 |
return NULL; |
320 |
} |
321 |
|
322 |
static BlockDriver *find_image_format(const char *filename) |
323 |
{ |
324 |
int ret, score, score_max;
|
325 |
BlockDriver *drv1, *drv; |
326 |
uint8_t buf[2048];
|
327 |
BlockDriverState *bs; |
328 |
|
329 |
drv = find_protocol(filename); |
330 |
/* no need to test disk image formats for vvfat */
|
331 |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
332 |
return drv;
|
333 |
|
334 |
ret = bdrv_file_open(&bs, filename, 0);
|
335 |
if (ret < 0) |
336 |
return NULL; |
337 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
338 |
bdrv_delete(bs); |
339 |
if (ret < 0) { |
340 |
return NULL; |
341 |
} |
342 |
|
343 |
score_max = 0;
|
344 |
drv = NULL;
|
345 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
346 |
if (drv1->bdrv_probe) {
|
347 |
score = drv1->bdrv_probe(buf, ret, filename); |
348 |
if (score > score_max) {
|
349 |
score_max = score; |
350 |
drv = drv1; |
351 |
} |
352 |
} |
353 |
} |
354 |
return drv;
|
355 |
} |
356 |
|
357 |
/**
|
358 |
* Set the current 'total_sectors' value
|
359 |
*/
|
360 |
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
361 |
{ |
362 |
BlockDriver *drv = bs->drv; |
363 |
|
364 |
/* query actual device if possible, otherwise just trust the hint */
|
365 |
if (drv->bdrv_getlength) {
|
366 |
int64_t length = drv->bdrv_getlength(bs); |
367 |
if (length < 0) { |
368 |
return length;
|
369 |
} |
370 |
hint = length >> BDRV_SECTOR_BITS; |
371 |
} |
372 |
|
373 |
bs->total_sectors = hint; |
374 |
return 0; |
375 |
} |
376 |
|
377 |
/*
|
378 |
* Common part for opening disk images and files
|
379 |
*/
|
380 |
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
381 |
int flags, BlockDriver *drv)
|
382 |
{ |
383 |
int ret, open_flags;
|
384 |
|
385 |
assert(drv != NULL);
|
386 |
|
387 |
bs->file = NULL;
|
388 |
bs->total_sectors = 0;
|
389 |
bs->is_temporary = 0;
|
390 |
bs->encrypted = 0;
|
391 |
bs->valid_key = 0;
|
392 |
bs->open_flags = flags; |
393 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
394 |
bs->buffer_alignment = 512;
|
395 |
|
396 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
397 |
|
398 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
399 |
return -ENOTSUP;
|
400 |
} |
401 |
|
402 |
bs->drv = drv; |
403 |
bs->opaque = qemu_mallocz(drv->instance_size); |
404 |
|
405 |
/*
|
406 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
407 |
* write cache to the guest. We do need the fdatasync to flush
|
408 |
* out transactions for block allocations, and we maybe have a
|
409 |
* volatile write cache in our backing device to deal with.
|
410 |
*/
|
411 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
412 |
bs->enable_write_cache = 1;
|
413 |
|
414 |
/*
|
415 |
* Clear flags that are internal to the block layer before opening the
|
416 |
* image.
|
417 |
*/
|
418 |
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
419 |
|
420 |
/*
|
421 |
* Snapshots should be writeable.
|
422 |
*/
|
423 |
if (bs->is_temporary) {
|
424 |
open_flags |= BDRV_O_RDWR; |
425 |
} |
426 |
|
427 |
/* Open the image, either directly or using a protocol */
|
428 |
if (drv->bdrv_file_open) {
|
429 |
ret = drv->bdrv_file_open(bs, filename, open_flags); |
430 |
} else {
|
431 |
ret = bdrv_file_open(&bs->file, filename, open_flags); |
432 |
if (ret >= 0) { |
433 |
ret = drv->bdrv_open(bs, open_flags); |
434 |
} |
435 |
} |
436 |
|
437 |
if (ret < 0) { |
438 |
goto free_and_fail;
|
439 |
} |
440 |
|
441 |
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
442 |
|
443 |
ret = refresh_total_sectors(bs, bs->total_sectors); |
444 |
if (ret < 0) { |
445 |
goto free_and_fail;
|
446 |
} |
447 |
|
448 |
#ifndef _WIN32
|
449 |
if (bs->is_temporary) {
|
450 |
unlink(filename); |
451 |
} |
452 |
#endif
|
453 |
return 0; |
454 |
|
455 |
free_and_fail:
|
456 |
if (bs->file) {
|
457 |
bdrv_delete(bs->file); |
458 |
bs->file = NULL;
|
459 |
} |
460 |
qemu_free(bs->opaque); |
461 |
bs->opaque = NULL;
|
462 |
bs->drv = NULL;
|
463 |
return ret;
|
464 |
} |
465 |
|
466 |
/*
|
467 |
* Opens a file using a protocol (file, host_device, nbd, ...)
|
468 |
*/
|
469 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
470 |
{ |
471 |
BlockDriverState *bs; |
472 |
BlockDriver *drv; |
473 |
int ret;
|
474 |
|
475 |
drv = find_protocol(filename); |
476 |
if (!drv) {
|
477 |
return -ENOENT;
|
478 |
} |
479 |
|
480 |
bs = bdrv_new("");
|
481 |
ret = bdrv_open_common(bs, filename, flags, drv); |
482 |
if (ret < 0) { |
483 |
bdrv_delete(bs); |
484 |
return ret;
|
485 |
} |
486 |
bs->growable = 1;
|
487 |
*pbs = bs; |
488 |
return 0; |
489 |
} |
490 |
|
491 |
/*
|
492 |
* Opens a disk image (raw, qcow2, vmdk, ...)
|
493 |
*/
|
494 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
495 |
BlockDriver *drv) |
496 |
{ |
497 |
int ret;
|
498 |
|
499 |
if (flags & BDRV_O_SNAPSHOT) {
|
500 |
BlockDriverState *bs1; |
501 |
int64_t total_size; |
502 |
int is_protocol = 0; |
503 |
BlockDriver *bdrv_qcow2; |
504 |
QEMUOptionParameter *options; |
505 |
char tmp_filename[PATH_MAX];
|
506 |
char backing_filename[PATH_MAX];
|
507 |
|
508 |
/* if snapshot, we create a temporary backing file and open it
|
509 |
instead of opening 'filename' directly */
|
510 |
|
511 |
/* if there is a backing file, use it */
|
512 |
bs1 = bdrv_new("");
|
513 |
ret = bdrv_open(bs1, filename, 0, drv);
|
514 |
if (ret < 0) { |
515 |
bdrv_delete(bs1); |
516 |
return ret;
|
517 |
} |
518 |
total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
519 |
|
520 |
if (bs1->drv && bs1->drv->protocol_name)
|
521 |
is_protocol = 1;
|
522 |
|
523 |
bdrv_delete(bs1); |
524 |
|
525 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
526 |
|
527 |
/* Real path is meaningless for protocols */
|
528 |
if (is_protocol)
|
529 |
snprintf(backing_filename, sizeof(backing_filename),
|
530 |
"%s", filename);
|
531 |
else if (!realpath(filename, backing_filename)) |
532 |
return -errno;
|
533 |
|
534 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
535 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
536 |
|
537 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
538 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
539 |
if (drv) {
|
540 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
541 |
drv->format_name); |
542 |
} |
543 |
|
544 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
545 |
free_option_parameters(options); |
546 |
if (ret < 0) { |
547 |
return ret;
|
548 |
} |
549 |
|
550 |
filename = tmp_filename; |
551 |
drv = bdrv_qcow2; |
552 |
bs->is_temporary = 1;
|
553 |
} |
554 |
|
555 |
/* Find the right image format driver */
|
556 |
if (!drv) {
|
557 |
drv = find_image_format(filename); |
558 |
} |
559 |
|
560 |
if (!drv) {
|
561 |
ret = -ENOENT; |
562 |
goto unlink_and_fail;
|
563 |
} |
564 |
|
565 |
/* Open the image */
|
566 |
ret = bdrv_open_common(bs, filename, flags, drv); |
567 |
if (ret < 0) { |
568 |
goto unlink_and_fail;
|
569 |
} |
570 |
|
571 |
/* If there is a backing file, use it */
|
572 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
573 |
char backing_filename[PATH_MAX];
|
574 |
int back_flags;
|
575 |
BlockDriver *back_drv = NULL;
|
576 |
|
577 |
bs->backing_hd = bdrv_new("");
|
578 |
path_combine(backing_filename, sizeof(backing_filename),
|
579 |
filename, bs->backing_file); |
580 |
if (bs->backing_format[0] != '\0') |
581 |
back_drv = bdrv_find_format(bs->backing_format); |
582 |
|
583 |
/* backing files always opened read-only */
|
584 |
back_flags = |
585 |
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
586 |
|
587 |
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
588 |
if (ret < 0) { |
589 |
bdrv_close(bs); |
590 |
return ret;
|
591 |
} |
592 |
if (bs->is_temporary) {
|
593 |
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
594 |
} else {
|
595 |
/* base image inherits from "parent" */
|
596 |
bs->backing_hd->keep_read_only = bs->keep_read_only; |
597 |
} |
598 |
} |
599 |
|
600 |
if (!bdrv_key_required(bs)) {
|
601 |
/* call the change callback */
|
602 |
bs->media_changed = 1;
|
603 |
if (bs->change_cb)
|
604 |
bs->change_cb(bs->change_opaque); |
605 |
} |
606 |
|
607 |
return 0; |
608 |
|
609 |
unlink_and_fail:
|
610 |
if (bs->is_temporary) {
|
611 |
unlink(filename); |
612 |
} |
613 |
return ret;
|
614 |
} |
615 |
|
616 |
void bdrv_close(BlockDriverState *bs)
|
617 |
{ |
618 |
if (bs->drv) {
|
619 |
if (bs->backing_hd) {
|
620 |
bdrv_delete(bs->backing_hd); |
621 |
bs->backing_hd = NULL;
|
622 |
} |
623 |
bs->drv->bdrv_close(bs); |
624 |
qemu_free(bs->opaque); |
625 |
#ifdef _WIN32
|
626 |
if (bs->is_temporary) {
|
627 |
unlink(bs->filename); |
628 |
} |
629 |
#endif
|
630 |
bs->opaque = NULL;
|
631 |
bs->drv = NULL;
|
632 |
|
633 |
if (bs->file != NULL) { |
634 |
bdrv_close(bs->file); |
635 |
} |
636 |
|
637 |
/* call the change callback */
|
638 |
bs->media_changed = 1;
|
639 |
if (bs->change_cb)
|
640 |
bs->change_cb(bs->change_opaque); |
641 |
} |
642 |
} |
643 |
|
644 |
void bdrv_delete(BlockDriverState *bs)
|
645 |
{ |
646 |
/* remove from list, if necessary */
|
647 |
if (bs->device_name[0] != '\0') { |
648 |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
649 |
} |
650 |
|
651 |
bdrv_close(bs); |
652 |
if (bs->file != NULL) { |
653 |
bdrv_delete(bs->file); |
654 |
} |
655 |
|
656 |
qemu_free(bs); |
657 |
} |
658 |
|
659 |
/*
|
660 |
* Run consistency checks on an image
|
661 |
*
|
662 |
* Returns the number of errors or -errno when an internal error occurs
|
663 |
*/
|
664 |
int bdrv_check(BlockDriverState *bs)
|
665 |
{ |
666 |
if (bs->drv->bdrv_check == NULL) { |
667 |
return -ENOTSUP;
|
668 |
} |
669 |
|
670 |
return bs->drv->bdrv_check(bs);
|
671 |
} |
672 |
|
673 |
/* commit COW file into the raw image */
|
674 |
int bdrv_commit(BlockDriverState *bs)
|
675 |
{ |
676 |
BlockDriver *drv = bs->drv; |
677 |
int64_t i, total_sectors; |
678 |
int n, j, ro, open_flags;
|
679 |
int ret = 0, rw_ret = 0; |
680 |
unsigned char sector[512]; |
681 |
char filename[1024]; |
682 |
BlockDriverState *bs_rw, *bs_ro; |
683 |
|
684 |
if (!drv)
|
685 |
return -ENOMEDIUM;
|
686 |
|
687 |
if (!bs->backing_hd) {
|
688 |
return -ENOTSUP;
|
689 |
} |
690 |
|
691 |
if (bs->backing_hd->keep_read_only) {
|
692 |
return -EACCES;
|
693 |
} |
694 |
|
695 |
ro = bs->backing_hd->read_only; |
696 |
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
697 |
open_flags = bs->backing_hd->open_flags; |
698 |
|
699 |
if (ro) {
|
700 |
/* re-open as RW */
|
701 |
bdrv_delete(bs->backing_hd); |
702 |
bs->backing_hd = NULL;
|
703 |
bs_rw = bdrv_new("");
|
704 |
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
705 |
if (rw_ret < 0) { |
706 |
bdrv_delete(bs_rw); |
707 |
/* try to re-open read-only */
|
708 |
bs_ro = bdrv_new("");
|
709 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
710 |
if (ret < 0) { |
711 |
bdrv_delete(bs_ro); |
712 |
/* drive not functional anymore */
|
713 |
bs->drv = NULL;
|
714 |
return ret;
|
715 |
} |
716 |
bs->backing_hd = bs_ro; |
717 |
return rw_ret;
|
718 |
} |
719 |
bs->backing_hd = bs_rw; |
720 |
} |
721 |
|
722 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
723 |
for (i = 0; i < total_sectors;) { |
724 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
725 |
for(j = 0; j < n; j++) { |
726 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
727 |
ret = -EIO; |
728 |
goto ro_cleanup;
|
729 |
} |
730 |
|
731 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
732 |
ret = -EIO; |
733 |
goto ro_cleanup;
|
734 |
} |
735 |
i++; |
736 |
} |
737 |
} else {
|
738 |
i += n; |
739 |
} |
740 |
} |
741 |
|
742 |
if (drv->bdrv_make_empty) {
|
743 |
ret = drv->bdrv_make_empty(bs); |
744 |
bdrv_flush(bs); |
745 |
} |
746 |
|
747 |
/*
|
748 |
* Make sure all data we wrote to the backing device is actually
|
749 |
* stable on disk.
|
750 |
*/
|
751 |
if (bs->backing_hd)
|
752 |
bdrv_flush(bs->backing_hd); |
753 |
|
754 |
ro_cleanup:
|
755 |
|
756 |
if (ro) {
|
757 |
/* re-open as RO */
|
758 |
bdrv_delete(bs->backing_hd); |
759 |
bs->backing_hd = NULL;
|
760 |
bs_ro = bdrv_new("");
|
761 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
762 |
if (ret < 0) { |
763 |
bdrv_delete(bs_ro); |
764 |
/* drive not functional anymore */
|
765 |
bs->drv = NULL;
|
766 |
return ret;
|
767 |
} |
768 |
bs->backing_hd = bs_ro; |
769 |
bs->backing_hd->keep_read_only = 0;
|
770 |
} |
771 |
|
772 |
return ret;
|
773 |
} |
774 |
|
775 |
/*
|
776 |
* Return values:
|
777 |
* 0 - success
|
778 |
* -EINVAL - backing format specified, but no file
|
779 |
* -ENOSPC - can't update the backing file because no space is left in the
|
780 |
* image file header
|
781 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
782 |
*/
|
783 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
784 |
const char *backing_file, const char *backing_fmt) |
785 |
{ |
786 |
BlockDriver *drv = bs->drv; |
787 |
|
788 |
if (drv->bdrv_change_backing_file != NULL) { |
789 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
790 |
} else {
|
791 |
return -ENOTSUP;
|
792 |
} |
793 |
} |
794 |
|
795 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
796 |
size_t size) |
797 |
{ |
798 |
int64_t len; |
799 |
|
800 |
if (!bdrv_is_inserted(bs))
|
801 |
return -ENOMEDIUM;
|
802 |
|
803 |
if (bs->growable)
|
804 |
return 0; |
805 |
|
806 |
len = bdrv_getlength(bs); |
807 |
|
808 |
if (offset < 0) |
809 |
return -EIO;
|
810 |
|
811 |
if ((offset > len) || (len - offset < size))
|
812 |
return -EIO;
|
813 |
|
814 |
return 0; |
815 |
} |
816 |
|
817 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
818 |
int nb_sectors)
|
819 |
{ |
820 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
821 |
} |
822 |
|
823 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
824 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
825 |
uint8_t *buf, int nb_sectors)
|
826 |
{ |
827 |
BlockDriver *drv = bs->drv; |
828 |
|
829 |
if (!drv)
|
830 |
return -ENOMEDIUM;
|
831 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
832 |
return -EIO;
|
833 |
|
834 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
835 |
} |
836 |
|
837 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
838 |
int nb_sectors, int dirty) |
839 |
{ |
840 |
int64_t start, end; |
841 |
unsigned long val, idx, bit; |
842 |
|
843 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
844 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
845 |
|
846 |
for (; start <= end; start++) {
|
847 |
idx = start / (sizeof(unsigned long) * 8); |
848 |
bit = start % (sizeof(unsigned long) * 8); |
849 |
val = bs->dirty_bitmap[idx]; |
850 |
if (dirty) {
|
851 |
if (!(val & (1 << bit))) { |
852 |
bs->dirty_count++; |
853 |
val |= 1 << bit;
|
854 |
} |
855 |
} else {
|
856 |
if (val & (1 << bit)) { |
857 |
bs->dirty_count--; |
858 |
val &= ~(1 << bit);
|
859 |
} |
860 |
} |
861 |
bs->dirty_bitmap[idx] = val; |
862 |
} |
863 |
} |
864 |
|
865 |
/* Return < 0 if error. Important errors are:
|
866 |
-EIO generic I/O error (may happen for all errors)
|
867 |
-ENOMEDIUM No media inserted.
|
868 |
-EINVAL Invalid sector number or nb_sectors
|
869 |
-EACCES Trying to write a read-only device
|
870 |
*/
|
871 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
872 |
const uint8_t *buf, int nb_sectors) |
873 |
{ |
874 |
BlockDriver *drv = bs->drv; |
875 |
if (!bs->drv)
|
876 |
return -ENOMEDIUM;
|
877 |
if (bs->read_only)
|
878 |
return -EACCES;
|
879 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
880 |
return -EIO;
|
881 |
|
882 |
if (bs->dirty_bitmap) {
|
883 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
884 |
} |
885 |
|
886 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
887 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
888 |
} |
889 |
|
890 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
891 |
} |
892 |
|
893 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
894 |
void *buf, int count1) |
895 |
{ |
896 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
897 |
int len, nb_sectors, count;
|
898 |
int64_t sector_num; |
899 |
int ret;
|
900 |
|
901 |
count = count1; |
902 |
/* first read to align to sector start */
|
903 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
904 |
if (len > count)
|
905 |
len = count; |
906 |
sector_num = offset >> BDRV_SECTOR_BITS; |
907 |
if (len > 0) { |
908 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
909 |
return ret;
|
910 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
911 |
count -= len; |
912 |
if (count == 0) |
913 |
return count1;
|
914 |
sector_num++; |
915 |
buf += len; |
916 |
} |
917 |
|
918 |
/* read the sectors "in place" */
|
919 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
920 |
if (nb_sectors > 0) { |
921 |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
922 |
return ret;
|
923 |
sector_num += nb_sectors; |
924 |
len = nb_sectors << BDRV_SECTOR_BITS; |
925 |
buf += len; |
926 |
count -= len; |
927 |
} |
928 |
|
929 |
/* add data from the last sector */
|
930 |
if (count > 0) { |
931 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
932 |
return ret;
|
933 |
memcpy(buf, tmp_buf, count); |
934 |
} |
935 |
return count1;
|
936 |
} |
937 |
|
938 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
939 |
const void *buf, int count1) |
940 |
{ |
941 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
942 |
int len, nb_sectors, count;
|
943 |
int64_t sector_num; |
944 |
int ret;
|
945 |
|
946 |
count = count1; |
947 |
/* first write to align to sector start */
|
948 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
949 |
if (len > count)
|
950 |
len = count; |
951 |
sector_num = offset >> BDRV_SECTOR_BITS; |
952 |
if (len > 0) { |
953 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
954 |
return ret;
|
955 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
956 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
957 |
return ret;
|
958 |
count -= len; |
959 |
if (count == 0) |
960 |
return count1;
|
961 |
sector_num++; |
962 |
buf += len; |
963 |
} |
964 |
|
965 |
/* write the sectors "in place" */
|
966 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
967 |
if (nb_sectors > 0) { |
968 |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
969 |
return ret;
|
970 |
sector_num += nb_sectors; |
971 |
len = nb_sectors << BDRV_SECTOR_BITS; |
972 |
buf += len; |
973 |
count -= len; |
974 |
} |
975 |
|
976 |
/* add data from the last sector */
|
977 |
if (count > 0) { |
978 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
979 |
return ret;
|
980 |
memcpy(tmp_buf, buf, count); |
981 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
982 |
return ret;
|
983 |
} |
984 |
return count1;
|
985 |
} |
986 |
|
987 |
/**
|
988 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
989 |
*/
|
990 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
991 |
{ |
992 |
BlockDriver *drv = bs->drv; |
993 |
int ret;
|
994 |
if (!drv)
|
995 |
return -ENOMEDIUM;
|
996 |
if (!drv->bdrv_truncate)
|
997 |
return -ENOTSUP;
|
998 |
if (bs->read_only)
|
999 |
return -EACCES;
|
1000 |
ret = drv->bdrv_truncate(bs, offset); |
1001 |
if (ret == 0) { |
1002 |
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
1003 |
} |
1004 |
return ret;
|
1005 |
} |
1006 |
|
1007 |
/**
|
1008 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
1009 |
*/
|
1010 |
int64_t bdrv_getlength(BlockDriverState *bs) |
1011 |
{ |
1012 |
BlockDriver *drv = bs->drv; |
1013 |
if (!drv)
|
1014 |
return -ENOMEDIUM;
|
1015 |
|
1016 |
/* Fixed size devices use the total_sectors value for speed instead of
|
1017 |
issuing a length query (like lseek) on each call. Also, legacy block
|
1018 |
drivers don't provide a bdrv_getlength function and must use
|
1019 |
total_sectors. */
|
1020 |
if (!bs->growable || !drv->bdrv_getlength) {
|
1021 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
1022 |
} |
1023 |
return drv->bdrv_getlength(bs);
|
1024 |
} |
1025 |
|
1026 |
/* return 0 as number of sectors if no device present or error */
|
1027 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
1028 |
{ |
1029 |
int64_t length; |
1030 |
length = bdrv_getlength(bs); |
1031 |
if (length < 0) |
1032 |
length = 0;
|
1033 |
else
|
1034 |
length = length >> BDRV_SECTOR_BITS; |
1035 |
*nb_sectors_ptr = length; |
1036 |
} |
1037 |
|
1038 |
struct partition {
|
1039 |
uint8_t boot_ind; /* 0x80 - active */
|
1040 |
uint8_t head; /* starting head */
|
1041 |
uint8_t sector; /* starting sector */
|
1042 |
uint8_t cyl; /* starting cylinder */
|
1043 |
uint8_t sys_ind; /* What partition type */
|
1044 |
uint8_t end_head; /* end head */
|
1045 |
uint8_t end_sector; /* end sector */
|
1046 |
uint8_t end_cyl; /* end cylinder */
|
1047 |
uint32_t start_sect; /* starting sector counting from 0 */
|
1048 |
uint32_t nr_sects; /* nr of sectors in partition */
|
1049 |
} __attribute__((packed)); |
1050 |
|
1051 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
1052 |
static int guess_disk_lchs(BlockDriverState *bs, |
1053 |
int *pcylinders, int *pheads, int *psectors) |
1054 |
{ |
1055 |
uint8_t buf[512];
|
1056 |
int ret, i, heads, sectors, cylinders;
|
1057 |
struct partition *p;
|
1058 |
uint32_t nr_sects; |
1059 |
uint64_t nb_sectors; |
1060 |
|
1061 |
bdrv_get_geometry(bs, &nb_sectors); |
1062 |
|
1063 |
ret = bdrv_read(bs, 0, buf, 1); |
1064 |
if (ret < 0) |
1065 |
return -1; |
1066 |
/* test msdos magic */
|
1067 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
1068 |
return -1; |
1069 |
for(i = 0; i < 4; i++) { |
1070 |
p = ((struct partition *)(buf + 0x1be)) + i; |
1071 |
nr_sects = le32_to_cpu(p->nr_sects); |
1072 |
if (nr_sects && p->end_head) {
|
1073 |
/* We make the assumption that the partition terminates on
|
1074 |
a cylinder boundary */
|
1075 |
heads = p->end_head + 1;
|
1076 |
sectors = p->end_sector & 63;
|
1077 |
if (sectors == 0) |
1078 |
continue;
|
1079 |
cylinders = nb_sectors / (heads * sectors); |
1080 |
if (cylinders < 1 || cylinders > 16383) |
1081 |
continue;
|
1082 |
*pheads = heads; |
1083 |
*psectors = sectors; |
1084 |
*pcylinders = cylinders; |
1085 |
#if 0
|
1086 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
1087 |
cylinders, heads, sectors);
|
1088 |
#endif
|
1089 |
return 0; |
1090 |
} |
1091 |
} |
1092 |
return -1; |
1093 |
} |
1094 |
|
1095 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
1096 |
{ |
1097 |
int translation, lba_detected = 0; |
1098 |
int cylinders, heads, secs;
|
1099 |
uint64_t nb_sectors; |
1100 |
|
1101 |
/* if a geometry hint is available, use it */
|
1102 |
bdrv_get_geometry(bs, &nb_sectors); |
1103 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
1104 |
translation = bdrv_get_translation_hint(bs); |
1105 |
if (cylinders != 0) { |
1106 |
*pcyls = cylinders; |
1107 |
*pheads = heads; |
1108 |
*psecs = secs; |
1109 |
} else {
|
1110 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
1111 |
if (heads > 16) { |
1112 |
/* if heads > 16, it means that a BIOS LBA
|
1113 |
translation was active, so the default
|
1114 |
hardware geometry is OK */
|
1115 |
lba_detected = 1;
|
1116 |
goto default_geometry;
|
1117 |
} else {
|
1118 |
*pcyls = cylinders; |
1119 |
*pheads = heads; |
1120 |
*psecs = secs; |
1121 |
/* disable any translation to be in sync with
|
1122 |
the logical geometry */
|
1123 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
1124 |
bdrv_set_translation_hint(bs, |
1125 |
BIOS_ATA_TRANSLATION_NONE); |
1126 |
} |
1127 |
} |
1128 |
} else {
|
1129 |
default_geometry:
|
1130 |
/* if no geometry, use a standard physical disk geometry */
|
1131 |
cylinders = nb_sectors / (16 * 63); |
1132 |
|
1133 |
if (cylinders > 16383) |
1134 |
cylinders = 16383;
|
1135 |
else if (cylinders < 2) |
1136 |
cylinders = 2;
|
1137 |
*pcyls = cylinders; |
1138 |
*pheads = 16;
|
1139 |
*psecs = 63;
|
1140 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
1141 |
if ((*pcyls * *pheads) <= 131072) { |
1142 |
bdrv_set_translation_hint(bs, |
1143 |
BIOS_ATA_TRANSLATION_LARGE); |
1144 |
} else {
|
1145 |
bdrv_set_translation_hint(bs, |
1146 |
BIOS_ATA_TRANSLATION_LBA); |
1147 |
} |
1148 |
} |
1149 |
} |
1150 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
1151 |
} |
1152 |
} |
1153 |
|
1154 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
1155 |
int cyls, int heads, int secs) |
1156 |
{ |
1157 |
bs->cyls = cyls; |
1158 |
bs->heads = heads; |
1159 |
bs->secs = secs; |
1160 |
} |
1161 |
|
1162 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
1163 |
{ |
1164 |
bs->type = type; |
1165 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
1166 |
type == BDRV_TYPE_FLOPPY)); |
1167 |
} |
1168 |
|
1169 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1170 |
{ |
1171 |
bs->translation = translation; |
1172 |
} |
1173 |
|
1174 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
1175 |
int *pcyls, int *pheads, int *psecs) |
1176 |
{ |
1177 |
*pcyls = bs->cyls; |
1178 |
*pheads = bs->heads; |
1179 |
*psecs = bs->secs; |
1180 |
} |
1181 |
|
1182 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
1183 |
{ |
1184 |
return bs->type;
|
1185 |
} |
1186 |
|
1187 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
1188 |
{ |
1189 |
return bs->translation;
|
1190 |
} |
1191 |
|
1192 |
int bdrv_is_removable(BlockDriverState *bs)
|
1193 |
{ |
1194 |
return bs->removable;
|
1195 |
} |
1196 |
|
1197 |
int bdrv_is_read_only(BlockDriverState *bs)
|
1198 |
{ |
1199 |
return bs->read_only;
|
1200 |
} |
1201 |
|
1202 |
int bdrv_is_sg(BlockDriverState *bs)
|
1203 |
{ |
1204 |
return bs->sg;
|
1205 |
} |
1206 |
|
1207 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
1208 |
{ |
1209 |
return bs->enable_write_cache;
|
1210 |
} |
1211 |
|
1212 |
/* XXX: no longer used */
|
1213 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
1214 |
void (*change_cb)(void *opaque), void *opaque) |
1215 |
{ |
1216 |
bs->change_cb = change_cb; |
1217 |
bs->change_opaque = opaque; |
1218 |
} |
1219 |
|
1220 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
1221 |
{ |
1222 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1223 |
return 1; |
1224 |
return bs->encrypted;
|
1225 |
} |
1226 |
|
1227 |
int bdrv_key_required(BlockDriverState *bs)
|
1228 |
{ |
1229 |
BlockDriverState *backing_hd = bs->backing_hd; |
1230 |
|
1231 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1232 |
return 1; |
1233 |
return (bs->encrypted && !bs->valid_key);
|
1234 |
} |
1235 |
|
1236 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
1237 |
{ |
1238 |
int ret;
|
1239 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1240 |
ret = bdrv_set_key(bs->backing_hd, key); |
1241 |
if (ret < 0) |
1242 |
return ret;
|
1243 |
if (!bs->encrypted)
|
1244 |
return 0; |
1245 |
} |
1246 |
if (!bs->encrypted) {
|
1247 |
return -EINVAL;
|
1248 |
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
1249 |
return -ENOMEDIUM;
|
1250 |
} |
1251 |
ret = bs->drv->bdrv_set_key(bs, key); |
1252 |
if (ret < 0) { |
1253 |
bs->valid_key = 0;
|
1254 |
} else if (!bs->valid_key) { |
1255 |
bs->valid_key = 1;
|
1256 |
/* call the change callback now, we skipped it on open */
|
1257 |
bs->media_changed = 1;
|
1258 |
if (bs->change_cb)
|
1259 |
bs->change_cb(bs->change_opaque); |
1260 |
} |
1261 |
return ret;
|
1262 |
} |
1263 |
|
1264 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1265 |
{ |
1266 |
if (!bs->drv) {
|
1267 |
buf[0] = '\0'; |
1268 |
} else {
|
1269 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
1270 |
} |
1271 |
} |
1272 |
|
1273 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1274 |
void *opaque)
|
1275 |
{ |
1276 |
BlockDriver *drv; |
1277 |
|
1278 |
QLIST_FOREACH(drv, &bdrv_drivers, list) { |
1279 |
it(opaque, drv->format_name); |
1280 |
} |
1281 |
} |
1282 |
|
1283 |
BlockDriverState *bdrv_find(const char *name) |
1284 |
{ |
1285 |
BlockDriverState *bs; |
1286 |
|
1287 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1288 |
if (!strcmp(name, bs->device_name)) {
|
1289 |
return bs;
|
1290 |
} |
1291 |
} |
1292 |
return NULL; |
1293 |
} |
1294 |
|
1295 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1296 |
{ |
1297 |
BlockDriverState *bs; |
1298 |
|
1299 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1300 |
it(opaque, bs); |
1301 |
} |
1302 |
} |
1303 |
|
1304 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1305 |
{ |
1306 |
return bs->device_name;
|
1307 |
} |
1308 |
|
1309 |
void bdrv_flush(BlockDriverState *bs)
|
1310 |
{ |
1311 |
if (bs->drv && bs->drv->bdrv_flush)
|
1312 |
bs->drv->bdrv_flush(bs); |
1313 |
} |
1314 |
|
1315 |
void bdrv_flush_all(void) |
1316 |
{ |
1317 |
BlockDriverState *bs; |
1318 |
|
1319 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1320 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1321 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { |
1322 |
bdrv_flush(bs); |
1323 |
} |
1324 |
} |
1325 |
} |
1326 |
|
1327 |
int bdrv_has_zero_init(BlockDriverState *bs)
|
1328 |
{ |
1329 |
assert(bs->drv); |
1330 |
|
1331 |
if (bs->drv->no_zero_init) {
|
1332 |
return 0; |
1333 |
} else if (bs->file) { |
1334 |
return bdrv_has_zero_init(bs->file);
|
1335 |
} |
1336 |
|
1337 |
return 1; |
1338 |
} |
1339 |
|
1340 |
/*
|
1341 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1342 |
* not implementing the functionality are assumed to not support backing files,
|
1343 |
* hence all their sectors are reported as allocated.
|
1344 |
*
|
1345 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1346 |
* the specified sector) that are known to be in the same
|
1347 |
* allocated/unallocated state.
|
1348 |
*
|
1349 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1350 |
*/
|
1351 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1352 |
int *pnum)
|
1353 |
{ |
1354 |
int64_t n; |
1355 |
if (!bs->drv->bdrv_is_allocated) {
|
1356 |
if (sector_num >= bs->total_sectors) {
|
1357 |
*pnum = 0;
|
1358 |
return 0; |
1359 |
} |
1360 |
n = bs->total_sectors - sector_num; |
1361 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1362 |
return 1; |
1363 |
} |
1364 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1365 |
} |
1366 |
|
1367 |
void bdrv_mon_event(const BlockDriverState *bdrv, |
1368 |
BlockMonEventAction action, int is_read)
|
1369 |
{ |
1370 |
QObject *data; |
1371 |
const char *action_str; |
1372 |
|
1373 |
switch (action) {
|
1374 |
case BDRV_ACTION_REPORT:
|
1375 |
action_str = "report";
|
1376 |
break;
|
1377 |
case BDRV_ACTION_IGNORE:
|
1378 |
action_str = "ignore";
|
1379 |
break;
|
1380 |
case BDRV_ACTION_STOP:
|
1381 |
action_str = "stop";
|
1382 |
break;
|
1383 |
default:
|
1384 |
abort(); |
1385 |
} |
1386 |
|
1387 |
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
1388 |
bdrv->device_name, |
1389 |
action_str, |
1390 |
is_read ? "read" : "write"); |
1391 |
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
1392 |
|
1393 |
qobject_decref(data); |
1394 |
} |
1395 |
|
1396 |
static void bdrv_print_dict(QObject *obj, void *opaque) |
1397 |
{ |
1398 |
QDict *bs_dict; |
1399 |
Monitor *mon = opaque; |
1400 |
|
1401 |
bs_dict = qobject_to_qdict(obj); |
1402 |
|
1403 |
monitor_printf(mon, "%s: type=%s removable=%d",
|
1404 |
qdict_get_str(bs_dict, "device"),
|
1405 |
qdict_get_str(bs_dict, "type"),
|
1406 |
qdict_get_bool(bs_dict, "removable"));
|
1407 |
|
1408 |
if (qdict_get_bool(bs_dict, "removable")) { |
1409 |
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
1410 |
} |
1411 |
|
1412 |
if (qdict_haskey(bs_dict, "inserted")) { |
1413 |
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
1414 |
|
1415 |
monitor_printf(mon, " file=");
|
1416 |
monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
1417 |
if (qdict_haskey(qdict, "backing_file")) { |
1418 |
monitor_printf(mon, " backing_file=");
|
1419 |
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
1420 |
} |
1421 |
monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
1422 |
qdict_get_bool(qdict, "ro"),
|
1423 |
qdict_get_str(qdict, "drv"),
|
1424 |
qdict_get_bool(qdict, "encrypted"));
|
1425 |
} else {
|
1426 |
monitor_printf(mon, " [not inserted]");
|
1427 |
} |
1428 |
|
1429 |
monitor_printf(mon, "\n");
|
1430 |
} |
1431 |
|
1432 |
void bdrv_info_print(Monitor *mon, const QObject *data) |
1433 |
{ |
1434 |
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
1435 |
} |
1436 |
|
1437 |
/**
|
1438 |
* bdrv_info(): Block devices information
|
1439 |
*
|
1440 |
* Each block device information is stored in a QDict and the
|
1441 |
* returned QObject is a QList of all devices.
|
1442 |
*
|
1443 |
* The QDict contains the following:
|
1444 |
*
|
1445 |
* - "device": device name
|
1446 |
* - "type": device type
|
1447 |
* - "removable": true if the device is removable, false otherwise
|
1448 |
* - "locked": true if the device is locked, false otherwise
|
1449 |
* - "inserted": only present if the device is inserted, it is a QDict
|
1450 |
* containing the following:
|
1451 |
* - "file": device file name
|
1452 |
* - "ro": true if read-only, false otherwise
|
1453 |
* - "drv": driver format name
|
1454 |
* - "backing_file": backing file name if one is used
|
1455 |
* - "encrypted": true if encrypted, false otherwise
|
1456 |
*
|
1457 |
* Example:
|
1458 |
*
|
1459 |
* [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
|
1460 |
* "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
|
1461 |
* { "device": "floppy0", "type": "floppy", "removable": true,
|
1462 |
* "locked": false } ]
|
1463 |
*/
|
1464 |
void bdrv_info(Monitor *mon, QObject **ret_data)
|
1465 |
{ |
1466 |
QList *bs_list; |
1467 |
BlockDriverState *bs; |
1468 |
|
1469 |
bs_list = qlist_new(); |
1470 |
|
1471 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1472 |
QObject *bs_obj; |
1473 |
const char *type = "unknown"; |
1474 |
|
1475 |
switch(bs->type) {
|
1476 |
case BDRV_TYPE_HD:
|
1477 |
type = "hd";
|
1478 |
break;
|
1479 |
case BDRV_TYPE_CDROM:
|
1480 |
type = "cdrom";
|
1481 |
break;
|
1482 |
case BDRV_TYPE_FLOPPY:
|
1483 |
type = "floppy";
|
1484 |
break;
|
1485 |
} |
1486 |
|
1487 |
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
|
1488 |
"'removable': %i, 'locked': %i }",
|
1489 |
bs->device_name, type, bs->removable, |
1490 |
bs->locked); |
1491 |
|
1492 |
if (bs->drv) {
|
1493 |
QObject *obj; |
1494 |
QDict *bs_dict = qobject_to_qdict(bs_obj); |
1495 |
|
1496 |
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
1497 |
"'encrypted': %i }",
|
1498 |
bs->filename, bs->read_only, |
1499 |
bs->drv->format_name, |
1500 |
bdrv_is_encrypted(bs)); |
1501 |
if (bs->backing_file[0] != '\0') { |
1502 |
QDict *qdict = qobject_to_qdict(obj); |
1503 |
qdict_put(qdict, "backing_file",
|
1504 |
qstring_from_str(bs->backing_file)); |
1505 |
} |
1506 |
|
1507 |
qdict_put_obj(bs_dict, "inserted", obj);
|
1508 |
} |
1509 |
qlist_append_obj(bs_list, bs_obj); |
1510 |
} |
1511 |
|
1512 |
*ret_data = QOBJECT(bs_list); |
1513 |
} |
1514 |
|
1515 |
static void bdrv_stats_iter(QObject *data, void *opaque) |
1516 |
{ |
1517 |
QDict *qdict; |
1518 |
Monitor *mon = opaque; |
1519 |
|
1520 |
qdict = qobject_to_qdict(data); |
1521 |
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
1522 |
|
1523 |
qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
1524 |
monitor_printf(mon, " rd_bytes=%" PRId64
|
1525 |
" wr_bytes=%" PRId64
|
1526 |
" rd_operations=%" PRId64
|
1527 |
" wr_operations=%" PRId64
|
1528 |
"\n",
|
1529 |
qdict_get_int(qdict, "rd_bytes"),
|
1530 |
qdict_get_int(qdict, "wr_bytes"),
|
1531 |
qdict_get_int(qdict, "rd_operations"),
|
1532 |
qdict_get_int(qdict, "wr_operations"));
|
1533 |
} |
1534 |
|
1535 |
void bdrv_stats_print(Monitor *mon, const QObject *data) |
1536 |
{ |
1537 |
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
1538 |
} |
1539 |
|
1540 |
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
|
1541 |
{ |
1542 |
QObject *res; |
1543 |
QDict *dict; |
1544 |
|
1545 |
res = qobject_from_jsonf("{ 'stats': {"
|
1546 |
"'rd_bytes': %" PRId64 "," |
1547 |
"'wr_bytes': %" PRId64 "," |
1548 |
"'rd_operations': %" PRId64 "," |
1549 |
"'wr_operations': %" PRId64 "," |
1550 |
"'wr_highest_offset': %" PRId64
|
1551 |
"} }",
|
1552 |
bs->rd_bytes, bs->wr_bytes, |
1553 |
bs->rd_ops, bs->wr_ops, |
1554 |
bs->wr_highest_sector * 512);
|
1555 |
dict = qobject_to_qdict(res); |
1556 |
|
1557 |
if (*bs->device_name) {
|
1558 |
qdict_put(dict, "device", qstring_from_str(bs->device_name));
|
1559 |
} |
1560 |
|
1561 |
if (bs->file) {
|
1562 |
QObject *parent = bdrv_info_stats_bs(bs->file); |
1563 |
qdict_put_obj(dict, "parent", parent);
|
1564 |
} |
1565 |
|
1566 |
return res;
|
1567 |
} |
1568 |
|
1569 |
/**
|
1570 |
* bdrv_info_stats(): show block device statistics
|
1571 |
*
|
1572 |
* Each device statistic information is stored in a QDict and
|
1573 |
* the returned QObject is a QList of all devices.
|
1574 |
*
|
1575 |
* The QDict contains the following:
|
1576 |
*
|
1577 |
* - "device": device name
|
1578 |
* - "stats": A QDict with the statistics information, it contains:
|
1579 |
* - "rd_bytes": bytes read
|
1580 |
* - "wr_bytes": bytes written
|
1581 |
* - "rd_operations": read operations
|
1582 |
* - "wr_operations": write operations
|
1583 |
* - "wr_highest_offset": Highest offset of a sector written since the
|
1584 |
* BlockDriverState has been opened
|
1585 |
* - "parent": Contains recursively the statistics of the underlying
|
1586 |
* protocol (e.g. the host file for a qcow2 image). If there is no
|
1587 |
* underlying protocol, this field is omitted.
|
1588 |
*
|
1589 |
* Example:
|
1590 |
*
|
1591 |
* [ { "device": "ide0-hd0",
|
1592 |
* "stats": { "rd_bytes": 512,
|
1593 |
* "wr_bytes": 0,
|
1594 |
* "rd_operations": 1,
|
1595 |
* "wr_operations": 0,
|
1596 |
* "wr_highest_offset": 0,
|
1597 |
* "parent": {
|
1598 |
* "stats": { "rd_bytes": 1024,
|
1599 |
* "wr_bytes": 0,
|
1600 |
* "rd_operations": 2,
|
1601 |
* "wr_operations": 0,
|
1602 |
* "wr_highest_offset": 0,
|
1603 |
* }
|
1604 |
* } } },
|
1605 |
* { "device": "ide1-cd0",
|
1606 |
* "stats": { "rd_bytes": 0,
|
1607 |
* "wr_bytes": 0,
|
1608 |
* "rd_operations": 0,
|
1609 |
* "wr_operations": 0,
|
1610 |
* "wr_highest_offset": 0 } },
|
1611 |
*/
|
1612 |
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
1613 |
{ |
1614 |
QObject *obj; |
1615 |
QList *devices; |
1616 |
BlockDriverState *bs; |
1617 |
|
1618 |
devices = qlist_new(); |
1619 |
|
1620 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1621 |
obj = bdrv_info_stats_bs(bs); |
1622 |
qlist_append_obj(devices, obj); |
1623 |
} |
1624 |
|
1625 |
*ret_data = QOBJECT(devices); |
1626 |
} |
1627 |
|
1628 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1629 |
{ |
1630 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1631 |
return bs->backing_file;
|
1632 |
else if (bs->encrypted) |
1633 |
return bs->filename;
|
1634 |
else
|
1635 |
return NULL; |
1636 |
} |
1637 |
|
1638 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1639 |
char *filename, int filename_size) |
1640 |
{ |
1641 |
if (!bs->backing_file) {
|
1642 |
pstrcpy(filename, filename_size, "");
|
1643 |
} else {
|
1644 |
pstrcpy(filename, filename_size, bs->backing_file); |
1645 |
} |
1646 |
} |
1647 |
|
1648 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1649 |
const uint8_t *buf, int nb_sectors) |
1650 |
{ |
1651 |
BlockDriver *drv = bs->drv; |
1652 |
if (!drv)
|
1653 |
return -ENOMEDIUM;
|
1654 |
if (!drv->bdrv_write_compressed)
|
1655 |
return -ENOTSUP;
|
1656 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1657 |
return -EIO;
|
1658 |
|
1659 |
if (bs->dirty_bitmap) {
|
1660 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1661 |
} |
1662 |
|
1663 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1664 |
} |
1665 |
|
1666 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1667 |
{ |
1668 |
BlockDriver *drv = bs->drv; |
1669 |
if (!drv)
|
1670 |
return -ENOMEDIUM;
|
1671 |
if (!drv->bdrv_get_info)
|
1672 |
return -ENOTSUP;
|
1673 |
memset(bdi, 0, sizeof(*bdi)); |
1674 |
return drv->bdrv_get_info(bs, bdi);
|
1675 |
} |
1676 |
|
1677 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1678 |
int64_t pos, int size)
|
1679 |
{ |
1680 |
BlockDriver *drv = bs->drv; |
1681 |
if (!drv)
|
1682 |
return -ENOMEDIUM;
|
1683 |
if (!drv->bdrv_save_vmstate)
|
1684 |
return -ENOTSUP;
|
1685 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1686 |
} |
1687 |
|
1688 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1689 |
int64_t pos, int size)
|
1690 |
{ |
1691 |
BlockDriver *drv = bs->drv; |
1692 |
if (!drv)
|
1693 |
return -ENOMEDIUM;
|
1694 |
if (!drv->bdrv_load_vmstate)
|
1695 |
return -ENOTSUP;
|
1696 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1697 |
} |
1698 |
|
1699 |
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
1700 |
{ |
1701 |
BlockDriver *drv = bs->drv; |
1702 |
|
1703 |
if (!drv || !drv->bdrv_debug_event) {
|
1704 |
return;
|
1705 |
} |
1706 |
|
1707 |
return drv->bdrv_debug_event(bs, event);
|
1708 |
|
1709 |
} |
1710 |
|
1711 |
/**************************************************************/
|
1712 |
/* handling of snapshots */
|
1713 |
|
1714 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1715 |
QEMUSnapshotInfo *sn_info) |
1716 |
{ |
1717 |
BlockDriver *drv = bs->drv; |
1718 |
if (!drv)
|
1719 |
return -ENOMEDIUM;
|
1720 |
if (!drv->bdrv_snapshot_create)
|
1721 |
return -ENOTSUP;
|
1722 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1723 |
} |
1724 |
|
1725 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1726 |
const char *snapshot_id) |
1727 |
{ |
1728 |
BlockDriver *drv = bs->drv; |
1729 |
if (!drv)
|
1730 |
return -ENOMEDIUM;
|
1731 |
if (!drv->bdrv_snapshot_goto)
|
1732 |
return -ENOTSUP;
|
1733 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1734 |
} |
1735 |
|
1736 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1737 |
{ |
1738 |
BlockDriver *drv = bs->drv; |
1739 |
if (!drv)
|
1740 |
return -ENOMEDIUM;
|
1741 |
if (!drv->bdrv_snapshot_delete)
|
1742 |
return -ENOTSUP;
|
1743 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1744 |
} |
1745 |
|
1746 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1747 |
QEMUSnapshotInfo **psn_info) |
1748 |
{ |
1749 |
BlockDriver *drv = bs->drv; |
1750 |
if (!drv)
|
1751 |
return -ENOMEDIUM;
|
1752 |
if (!drv->bdrv_snapshot_list)
|
1753 |
return -ENOTSUP;
|
1754 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1755 |
} |
1756 |
|
1757 |
#define NB_SUFFIXES 4 |
1758 |
|
1759 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1760 |
{ |
1761 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1762 |
int64_t base; |
1763 |
int i;
|
1764 |
|
1765 |
if (size <= 999) { |
1766 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1767 |
} else {
|
1768 |
base = 1024;
|
1769 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1770 |
if (size < (10 * base)) { |
1771 |
snprintf(buf, buf_size, "%0.1f%c",
|
1772 |
(double)size / base,
|
1773 |
suffixes[i]); |
1774 |
break;
|
1775 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1776 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1777 |
((size + (base >> 1)) / base),
|
1778 |
suffixes[i]); |
1779 |
break;
|
1780 |
} |
1781 |
base = base * 1024;
|
1782 |
} |
1783 |
} |
1784 |
return buf;
|
1785 |
} |
1786 |
|
1787 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1788 |
{ |
1789 |
char buf1[128], date_buf[128], clock_buf[128]; |
1790 |
#ifdef _WIN32
|
1791 |
struct tm *ptm;
|
1792 |
#else
|
1793 |
struct tm tm;
|
1794 |
#endif
|
1795 |
time_t ti; |
1796 |
int64_t secs; |
1797 |
|
1798 |
if (!sn) {
|
1799 |
snprintf(buf, buf_size, |
1800 |
"%-10s%-20s%7s%20s%15s",
|
1801 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1802 |
} else {
|
1803 |
ti = sn->date_sec; |
1804 |
#ifdef _WIN32
|
1805 |
ptm = localtime(&ti); |
1806 |
strftime(date_buf, sizeof(date_buf),
|
1807 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1808 |
#else
|
1809 |
localtime_r(&ti, &tm); |
1810 |
strftime(date_buf, sizeof(date_buf),
|
1811 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1812 |
#endif
|
1813 |
secs = sn->vm_clock_nsec / 1000000000;
|
1814 |
snprintf(clock_buf, sizeof(clock_buf),
|
1815 |
"%02d:%02d:%02d.%03d",
|
1816 |
(int)(secs / 3600), |
1817 |
(int)((secs / 60) % 60), |
1818 |
(int)(secs % 60), |
1819 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1820 |
snprintf(buf, buf_size, |
1821 |
"%-10s%-20s%7s%20s%15s",
|
1822 |
sn->id_str, sn->name, |
1823 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1824 |
date_buf, |
1825 |
clock_buf); |
1826 |
} |
1827 |
return buf;
|
1828 |
} |
1829 |
|
1830 |
|
1831 |
/**************************************************************/
|
1832 |
/* async I/Os */
|
1833 |
|
1834 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1835 |
QEMUIOVector *qiov, int nb_sectors,
|
1836 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1837 |
{ |
1838 |
BlockDriver *drv = bs->drv; |
1839 |
BlockDriverAIOCB *ret; |
1840 |
|
1841 |
if (!drv)
|
1842 |
return NULL; |
1843 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1844 |
return NULL; |
1845 |
|
1846 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1847 |
cb, opaque); |
1848 |
|
1849 |
if (ret) {
|
1850 |
/* Update stats even though technically transfer has not happened. */
|
1851 |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1852 |
bs->rd_ops ++; |
1853 |
} |
1854 |
|
1855 |
return ret;
|
1856 |
} |
1857 |
|
1858 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1859 |
QEMUIOVector *qiov, int nb_sectors,
|
1860 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1861 |
{ |
1862 |
BlockDriver *drv = bs->drv; |
1863 |
BlockDriverAIOCB *ret; |
1864 |
|
1865 |
if (!drv)
|
1866 |
return NULL; |
1867 |
if (bs->read_only)
|
1868 |
return NULL; |
1869 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1870 |
return NULL; |
1871 |
|
1872 |
if (bs->dirty_bitmap) {
|
1873 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1874 |
} |
1875 |
|
1876 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1877 |
cb, opaque); |
1878 |
|
1879 |
if (ret) {
|
1880 |
/* Update stats even though technically transfer has not happened. */
|
1881 |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1882 |
bs->wr_ops ++; |
1883 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
1884 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
1885 |
} |
1886 |
} |
1887 |
|
1888 |
return ret;
|
1889 |
} |
1890 |
|
1891 |
|
1892 |
typedef struct MultiwriteCB { |
1893 |
int error;
|
1894 |
int num_requests;
|
1895 |
int num_callbacks;
|
1896 |
struct {
|
1897 |
BlockDriverCompletionFunc *cb; |
1898 |
void *opaque;
|
1899 |
QEMUIOVector *free_qiov; |
1900 |
void *free_buf;
|
1901 |
} callbacks[]; |
1902 |
} MultiwriteCB; |
1903 |
|
1904 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
1905 |
{ |
1906 |
int i;
|
1907 |
|
1908 |
for (i = 0; i < mcb->num_callbacks; i++) { |
1909 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1910 |
if (mcb->callbacks[i].free_qiov) {
|
1911 |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
1912 |
} |
1913 |
qemu_free(mcb->callbacks[i].free_qiov); |
1914 |
qemu_vfree(mcb->callbacks[i].free_buf); |
1915 |
} |
1916 |
} |
1917 |
|
1918 |
static void multiwrite_cb(void *opaque, int ret) |
1919 |
{ |
1920 |
MultiwriteCB *mcb = opaque; |
1921 |
|
1922 |
if (ret < 0 && !mcb->error) { |
1923 |
mcb->error = ret; |
1924 |
multiwrite_user_cb(mcb); |
1925 |
} |
1926 |
|
1927 |
mcb->num_requests--; |
1928 |
if (mcb->num_requests == 0) { |
1929 |
if (mcb->error == 0) { |
1930 |
multiwrite_user_cb(mcb); |
1931 |
} |
1932 |
qemu_free(mcb); |
1933 |
} |
1934 |
} |
1935 |
|
1936 |
static int multiwrite_req_compare(const void *a, const void *b) |
1937 |
{ |
1938 |
return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
1939 |
} |
1940 |
|
1941 |
/*
|
1942 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
1943 |
* requests that remain after merging.
|
1944 |
*/
|
1945 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1946 |
int num_reqs, MultiwriteCB *mcb)
|
1947 |
{ |
1948 |
int i, outidx;
|
1949 |
|
1950 |
// Sort requests by start sector
|
1951 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1952 |
|
1953 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
1954 |
// filling up gaps with zero sectors.
|
1955 |
outidx = 0;
|
1956 |
for (i = 1; i < num_reqs; i++) { |
1957 |
int merge = 0; |
1958 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1959 |
|
1960 |
// This handles the cases that are valid for all block drivers, namely
|
1961 |
// exactly sequential writes and overlapping writes.
|
1962 |
if (reqs[i].sector <= oldreq_last) {
|
1963 |
merge = 1;
|
1964 |
} |
1965 |
|
1966 |
// The block driver may decide that it makes sense to combine requests
|
1967 |
// even if there is a gap of some sectors between them. In this case,
|
1968 |
// the gap is filled with zeros (therefore only applicable for yet
|
1969 |
// unused space in format like qcow2).
|
1970 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
1971 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1972 |
} |
1973 |
|
1974 |
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1975 |
merge = 0;
|
1976 |
} |
1977 |
|
1978 |
if (merge) {
|
1979 |
size_t size; |
1980 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
1981 |
qemu_iovec_init(qiov, |
1982 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
1983 |
|
1984 |
// Add the first request to the merged one. If the requests are
|
1985 |
// overlapping, drop the last sectors of the first request.
|
1986 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
1987 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
1988 |
|
1989 |
// We might need to add some zeros between the two requests
|
1990 |
if (reqs[i].sector > oldreq_last) {
|
1991 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
1992 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
1993 |
memset(buf, 0, zero_bytes);
|
1994 |
qemu_iovec_add(qiov, buf, zero_bytes); |
1995 |
mcb->callbacks[i].free_buf = buf; |
1996 |
} |
1997 |
|
1998 |
// Add the second request
|
1999 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
2000 |
|
2001 |
reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
2002 |
reqs[outidx].qiov = qiov; |
2003 |
|
2004 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
2005 |
} else {
|
2006 |
outidx++; |
2007 |
reqs[outidx].sector = reqs[i].sector; |
2008 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
2009 |
reqs[outidx].qiov = reqs[i].qiov; |
2010 |
} |
2011 |
} |
2012 |
|
2013 |
return outidx + 1; |
2014 |
} |
2015 |
|
2016 |
/*
|
2017 |
* Submit multiple AIO write requests at once.
|
2018 |
*
|
2019 |
* On success, the function returns 0 and all requests in the reqs array have
|
2020 |
* been submitted. In error case this function returns -1, and any of the
|
2021 |
* requests may or may not be submitted yet. In particular, this means that the
|
2022 |
* callback will be called for some of the requests, for others it won't. The
|
2023 |
* caller must check the error field of the BlockRequest to wait for the right
|
2024 |
* callbacks (if error != 0, no callback will be called).
|
2025 |
*
|
2026 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
2027 |
* requests. However, the fields opaque and error are left unmodified as they
|
2028 |
* are used to signal failure for a single request to the caller.
|
2029 |
*/
|
2030 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
2031 |
{ |
2032 |
BlockDriverAIOCB *acb; |
2033 |
MultiwriteCB *mcb; |
2034 |
int i;
|
2035 |
|
2036 |
if (num_reqs == 0) { |
2037 |
return 0; |
2038 |
} |
2039 |
|
2040 |
// Create MultiwriteCB structure
|
2041 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
2042 |
mcb->num_requests = 0;
|
2043 |
mcb->num_callbacks = num_reqs; |
2044 |
|
2045 |
for (i = 0; i < num_reqs; i++) { |
2046 |
mcb->callbacks[i].cb = reqs[i].cb; |
2047 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
2048 |
} |
2049 |
|
2050 |
// Check for mergable requests
|
2051 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
2052 |
|
2053 |
// Run the aio requests
|
2054 |
for (i = 0; i < num_reqs; i++) { |
2055 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2056 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
2057 |
|
2058 |
if (acb == NULL) { |
2059 |
// We can only fail the whole thing if no request has been
|
2060 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
2061 |
// complete and report the error in the callback.
|
2062 |
if (mcb->num_requests == 0) { |
2063 |
reqs[i].error = -EIO; |
2064 |
goto fail;
|
2065 |
} else {
|
2066 |
mcb->num_requests++; |
2067 |
multiwrite_cb(mcb, -EIO); |
2068 |
break;
|
2069 |
} |
2070 |
} else {
|
2071 |
mcb->num_requests++; |
2072 |
} |
2073 |
} |
2074 |
|
2075 |
return 0; |
2076 |
|
2077 |
fail:
|
2078 |
free(mcb); |
2079 |
return -1; |
2080 |
} |
2081 |
|
2082 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2083 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2084 |
{ |
2085 |
BlockDriver *drv = bs->drv; |
2086 |
|
2087 |
if (!drv)
|
2088 |
return NULL; |
2089 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
2090 |
} |
2091 |
|
2092 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
2093 |
{ |
2094 |
acb->pool->cancel(acb); |
2095 |
} |
2096 |
|
2097 |
|
2098 |
/**************************************************************/
|
2099 |
/* async block device emulation */
|
2100 |
|
2101 |
typedef struct BlockDriverAIOCBSync { |
2102 |
BlockDriverAIOCB common; |
2103 |
QEMUBH *bh; |
2104 |
int ret;
|
2105 |
/* vector translation state */
|
2106 |
QEMUIOVector *qiov; |
2107 |
uint8_t *bounce; |
2108 |
int is_write;
|
2109 |
} BlockDriverAIOCBSync; |
2110 |
|
2111 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
2112 |
{ |
2113 |
BlockDriverAIOCBSync *acb = |
2114 |
container_of(blockacb, BlockDriverAIOCBSync, common); |
2115 |
qemu_bh_delete(acb->bh); |
2116 |
acb->bh = NULL;
|
2117 |
qemu_aio_release(acb); |
2118 |
} |
2119 |
|
2120 |
static AIOPool bdrv_em_aio_pool = {
|
2121 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
2122 |
.cancel = bdrv_aio_cancel_em, |
2123 |
}; |
2124 |
|
2125 |
static void bdrv_aio_bh_cb(void *opaque) |
2126 |
{ |
2127 |
BlockDriverAIOCBSync *acb = opaque; |
2128 |
|
2129 |
if (!acb->is_write)
|
2130 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
2131 |
qemu_vfree(acb->bounce); |
2132 |
acb->common.cb(acb->common.opaque, acb->ret); |
2133 |
qemu_bh_delete(acb->bh); |
2134 |
acb->bh = NULL;
|
2135 |
qemu_aio_release(acb); |
2136 |
} |
2137 |
|
2138 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
2139 |
int64_t sector_num, |
2140 |
QEMUIOVector *qiov, |
2141 |
int nb_sectors,
|
2142 |
BlockDriverCompletionFunc *cb, |
2143 |
void *opaque,
|
2144 |
int is_write)
|
2145 |
|
2146 |
{ |
2147 |
BlockDriverAIOCBSync *acb; |
2148 |
|
2149 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2150 |
acb->is_write = is_write; |
2151 |
acb->qiov = qiov; |
2152 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
2153 |
|
2154 |
if (!acb->bh)
|
2155 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2156 |
|
2157 |
if (is_write) {
|
2158 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
2159 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
2160 |
} else {
|
2161 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
2162 |
} |
2163 |
|
2164 |
qemu_bh_schedule(acb->bh); |
2165 |
|
2166 |
return &acb->common;
|
2167 |
} |
2168 |
|
2169 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
2170 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2171 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2172 |
{ |
2173 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2174 |
} |
2175 |
|
2176 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
2177 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2178 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2179 |
{ |
2180 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
2181 |
} |
2182 |
|
2183 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
2184 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2185 |
{ |
2186 |
BlockDriverAIOCBSync *acb; |
2187 |
|
2188 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2189 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
2190 |
acb->qiov = NULL;
|
2191 |
acb->bounce = NULL;
|
2192 |
acb->ret = 0;
|
2193 |
|
2194 |
if (!acb->bh)
|
2195 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2196 |
|
2197 |
bdrv_flush(bs); |
2198 |
qemu_bh_schedule(acb->bh); |
2199 |
return &acb->common;
|
2200 |
} |
2201 |
|
2202 |
/**************************************************************/
|
2203 |
/* sync block device emulation */
|
2204 |
|
2205 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
2206 |
{ |
2207 |
*(int *)opaque = ret;
|
2208 |
} |
2209 |
|
2210 |
#define NOT_DONE 0x7fffffff |
2211 |
|
2212 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
2213 |
uint8_t *buf, int nb_sectors)
|
2214 |
{ |
2215 |
int async_ret;
|
2216 |
BlockDriverAIOCB *acb; |
2217 |
struct iovec iov;
|
2218 |
QEMUIOVector qiov; |
2219 |
|
2220 |
async_context_push(); |
2221 |
|
2222 |
async_ret = NOT_DONE; |
2223 |
iov.iov_base = (void *)buf;
|
2224 |
iov.iov_len = nb_sectors * 512;
|
2225 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
2226 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
2227 |
bdrv_rw_em_cb, &async_ret); |
2228 |
if (acb == NULL) { |
2229 |
async_ret = -1;
|
2230 |
goto fail;
|
2231 |
} |
2232 |
|
2233 |
while (async_ret == NOT_DONE) {
|
2234 |
qemu_aio_wait(); |
2235 |
} |
2236 |
|
2237 |
|
2238 |
fail:
|
2239 |
async_context_pop(); |
2240 |
return async_ret;
|
2241 |
} |
2242 |
|
2243 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2244 |
const uint8_t *buf, int nb_sectors) |
2245 |
{ |
2246 |
int async_ret;
|
2247 |
BlockDriverAIOCB *acb; |
2248 |
struct iovec iov;
|
2249 |
QEMUIOVector qiov; |
2250 |
|
2251 |
async_context_push(); |
2252 |
|
2253 |
async_ret = NOT_DONE; |
2254 |
iov.iov_base = (void *)buf;
|
2255 |
iov.iov_len = nb_sectors * 512;
|
2256 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
2257 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
2258 |
bdrv_rw_em_cb, &async_ret); |
2259 |
if (acb == NULL) { |
2260 |
async_ret = -1;
|
2261 |
goto fail;
|
2262 |
} |
2263 |
while (async_ret == NOT_DONE) {
|
2264 |
qemu_aio_wait(); |
2265 |
} |
2266 |
|
2267 |
fail:
|
2268 |
async_context_pop(); |
2269 |
return async_ret;
|
2270 |
} |
2271 |
|
2272 |
void bdrv_init(void) |
2273 |
{ |
2274 |
module_call_init(MODULE_INIT_BLOCK); |
2275 |
} |
2276 |
|
2277 |
void bdrv_init_with_whitelist(void) |
2278 |
{ |
2279 |
use_bdrv_whitelist = 1;
|
2280 |
bdrv_init(); |
2281 |
} |
2282 |
|
2283 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
2284 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2285 |
{ |
2286 |
BlockDriverAIOCB *acb; |
2287 |
|
2288 |
if (pool->free_aiocb) {
|
2289 |
acb = pool->free_aiocb; |
2290 |
pool->free_aiocb = acb->next; |
2291 |
} else {
|
2292 |
acb = qemu_mallocz(pool->aiocb_size); |
2293 |
acb->pool = pool; |
2294 |
} |
2295 |
acb->bs = bs; |
2296 |
acb->cb = cb; |
2297 |
acb->opaque = opaque; |
2298 |
return acb;
|
2299 |
} |
2300 |
|
2301 |
void qemu_aio_release(void *p) |
2302 |
{ |
2303 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2304 |
AIOPool *pool = acb->pool; |
2305 |
acb->next = pool->free_aiocb; |
2306 |
pool->free_aiocb = acb; |
2307 |
} |
2308 |
|
2309 |
/**************************************************************/
|
2310 |
/* removable device support */
|
2311 |
|
2312 |
/**
|
2313 |
* Return TRUE if the media is present
|
2314 |
*/
|
2315 |
int bdrv_is_inserted(BlockDriverState *bs)
|
2316 |
{ |
2317 |
BlockDriver *drv = bs->drv; |
2318 |
int ret;
|
2319 |
if (!drv)
|
2320 |
return 0; |
2321 |
if (!drv->bdrv_is_inserted)
|
2322 |
return 1; |
2323 |
ret = drv->bdrv_is_inserted(bs); |
2324 |
return ret;
|
2325 |
} |
2326 |
|
2327 |
/**
|
2328 |
* Return TRUE if the media changed since the last call to this
|
2329 |
* function. It is currently only used for floppy disks
|
2330 |
*/
|
2331 |
int bdrv_media_changed(BlockDriverState *bs)
|
2332 |
{ |
2333 |
BlockDriver *drv = bs->drv; |
2334 |
int ret;
|
2335 |
|
2336 |
if (!drv || !drv->bdrv_media_changed)
|
2337 |
ret = -ENOTSUP; |
2338 |
else
|
2339 |
ret = drv->bdrv_media_changed(bs); |
2340 |
if (ret == -ENOTSUP)
|
2341 |
ret = bs->media_changed; |
2342 |
bs->media_changed = 0;
|
2343 |
return ret;
|
2344 |
} |
2345 |
|
2346 |
/**
|
2347 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
2348 |
*/
|
2349 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
2350 |
{ |
2351 |
BlockDriver *drv = bs->drv; |
2352 |
int ret;
|
2353 |
|
2354 |
if (bs->locked) {
|
2355 |
return -EBUSY;
|
2356 |
} |
2357 |
|
2358 |
if (!drv || !drv->bdrv_eject) {
|
2359 |
ret = -ENOTSUP; |
2360 |
} else {
|
2361 |
ret = drv->bdrv_eject(bs, eject_flag); |
2362 |
} |
2363 |
if (ret == -ENOTSUP) {
|
2364 |
if (eject_flag)
|
2365 |
bdrv_close(bs); |
2366 |
ret = 0;
|
2367 |
} |
2368 |
|
2369 |
return ret;
|
2370 |
} |
2371 |
|
2372 |
int bdrv_is_locked(BlockDriverState *bs)
|
2373 |
{ |
2374 |
return bs->locked;
|
2375 |
} |
2376 |
|
2377 |
/**
|
2378 |
* Lock or unlock the media (if it is locked, the user won't be able
|
2379 |
* to eject it manually).
|
2380 |
*/
|
2381 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
2382 |
{ |
2383 |
BlockDriver *drv = bs->drv; |
2384 |
|
2385 |
bs->locked = locked; |
2386 |
if (drv && drv->bdrv_set_locked) {
|
2387 |
drv->bdrv_set_locked(bs, locked); |
2388 |
} |
2389 |
} |
2390 |
|
2391 |
/* needed for generic scsi interface */
|
2392 |
|
2393 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
2394 |
{ |
2395 |
BlockDriver *drv = bs->drv; |
2396 |
|
2397 |
if (drv && drv->bdrv_ioctl)
|
2398 |
return drv->bdrv_ioctl(bs, req, buf);
|
2399 |
return -ENOTSUP;
|
2400 |
} |
2401 |
|
2402 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2403 |
unsigned long int req, void *buf, |
2404 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2405 |
{ |
2406 |
BlockDriver *drv = bs->drv; |
2407 |
|
2408 |
if (drv && drv->bdrv_aio_ioctl)
|
2409 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
2410 |
return NULL; |
2411 |
} |
2412 |
|
2413 |
|
2414 |
|
2415 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
2416 |
{ |
2417 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
2418 |
} |
2419 |
|
2420 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
2421 |
{ |
2422 |
int64_t bitmap_size; |
2423 |
|
2424 |
bs->dirty_count = 0;
|
2425 |
if (enable) {
|
2426 |
if (!bs->dirty_bitmap) {
|
2427 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
2428 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
2429 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
2430 |
|
2431 |
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
2432 |
} |
2433 |
} else {
|
2434 |
if (bs->dirty_bitmap) {
|
2435 |
qemu_free(bs->dirty_bitmap); |
2436 |
bs->dirty_bitmap = NULL;
|
2437 |
} |
2438 |
} |
2439 |
} |
2440 |
|
2441 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
2442 |
{ |
2443 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
2444 |
|
2445 |
if (bs->dirty_bitmap &&
|
2446 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
2447 |
return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
2448 |
(1 << (chunk % (sizeof(unsigned long) * 8))); |
2449 |
} else {
|
2450 |
return 0; |
2451 |
} |
2452 |
} |
2453 |
|
2454 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2455 |
int nr_sectors)
|
2456 |
{ |
2457 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2458 |
} |
2459 |
|
2460 |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
2461 |
{ |
2462 |
return bs->dirty_count;
|
2463 |
} |