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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 |
#ifdef _BSD
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/* include native header before sys-queue.h */
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#include <sys/queue.h> |
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#endif
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|
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#include "qemu-common.h" |
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#include "monitor.h" |
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#include "block_int.h" |
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|
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#ifdef _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/disk.h> |
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#endif
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|
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#define SECTOR_BITS 9 |
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#define SECTOR_SIZE (1 << SECTOR_BITS) |
43 |
|
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typedef struct BlockDriverAIOCBSync { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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int ret;
|
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} BlockDriverAIOCBSync; |
49 |
|
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static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
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int64_t sector_num, const uint8_t *buf, int nb_sectors, |
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BlockDriverCompletionFunc *cb, void *opaque);
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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
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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); |
61 |
|
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BlockDriverState *bdrv_first; |
63 |
|
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static BlockDriver *first_drv;
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65 |
|
66 |
int path_is_absolute(const char *path) |
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{ |
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const char *p; |
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#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; |
73 |
#endif
|
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p = strchr(path, ':');
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if (p)
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p++; |
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else
|
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
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#else
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return (*p == '/'); |
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#endif
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} |
85 |
|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
|
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path to it by considering it is relative to base_path. URL are
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supported. */
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{ |
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const char *p, *p1; |
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int len;
|
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|
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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); |
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} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
104 |
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; |
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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; |
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if (p1 > p)
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p = p1; |
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len = p - base_path; |
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if (len > dest_size - 1) |
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len = dest_size - 1;
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memcpy(dest, base_path, len); |
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dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
127 |
} |
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} |
129 |
|
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|
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static void bdrv_register(BlockDriver *bdrv) |
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{ |
133 |
if (!bdrv->bdrv_aio_read) {
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/* add AIO emulation layer */
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bdrv->bdrv_aio_read = bdrv_aio_read_em; |
136 |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
137 |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
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bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
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} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
140 |
/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
142 |
bdrv->bdrv_write = bdrv_write_em; |
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} |
144 |
bdrv->next = first_drv; |
145 |
first_drv = bdrv; |
146 |
} |
147 |
|
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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) |
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{ |
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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; |
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*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) |
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{ |
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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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} |
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return NULL; |
173 |
} |
174 |
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int bdrv_create(BlockDriver *drv,
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const char *filename, int64_t size_in_sectors, |
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const char *backing_file, int flags) |
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{ |
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if (!drv->bdrv_create)
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return -ENOTSUP;
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return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
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} |
183 |
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
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{ |
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char temp_dir[MAX_PATH];
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GetTempPath(MAX_PATH, temp_dir); |
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GetTempFileName(temp_dir, "qem", 0, filename); |
191 |
} |
192 |
#else
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void get_tmp_filename(char *filename, int size) |
194 |
{ |
195 |
int fd;
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const char *tmpdir; |
197 |
/* 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); |
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close(fd); |
204 |
} |
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#endif
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#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
209 |
{ |
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return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
213 |
} |
214 |
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static int is_windows_drive(const char *filename) |
216 |
{ |
217 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
219 |
return 1; |
220 |
if (strstart(filename, "\\\\.\\", NULL) || |
221 |
strstart(filename, "//./", NULL)) |
222 |
return 1; |
223 |
return 0; |
224 |
} |
225 |
#endif
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226 |
|
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static BlockDriver *find_protocol(const char *filename) |
228 |
{ |
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BlockDriver *drv1; |
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char protocol[128]; |
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int len;
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const char *p; |
233 |
|
234 |
#ifdef _WIN32
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if (is_windows_drive(filename) ||
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is_windows_drive_prefix(filename)) |
237 |
return &bdrv_raw;
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#endif
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p = strchr(filename, ':');
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240 |
if (!p)
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return &bdrv_raw;
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len = p - filename; |
243 |
if (len > sizeof(protocol) - 1) |
244 |
len = sizeof(protocol) - 1; |
245 |
memcpy(protocol, filename, len); |
246 |
protocol[len] = '\0';
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
248 |
if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) |
250 |
return drv1;
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} |
252 |
return NULL; |
253 |
} |
254 |
|
255 |
/* XXX: force raw format if block or character device ? It would
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256 |
simplify the BSD case */
|
257 |
static BlockDriver *find_image_format(const char *filename) |
258 |
{ |
259 |
int ret, score, score_max;
|
260 |
BlockDriver *drv1, *drv; |
261 |
uint8_t buf[2048];
|
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BlockDriverState *bs; |
263 |
|
264 |
/* detect host devices. By convention, /dev/cdrom[N] is always
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265 |
recognized as a host CDROM */
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if (strstart(filename, "/dev/cdrom", NULL)) |
267 |
return &bdrv_host_device;
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#ifdef _WIN32
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269 |
if (is_windows_drive(filename))
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270 |
return &bdrv_host_device;
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271 |
#else
|
272 |
{ |
273 |
struct stat st;
|
274 |
if (stat(filename, &st) >= 0 && |
275 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
276 |
return &bdrv_host_device;
|
277 |
} |
278 |
} |
279 |
#endif
|
280 |
|
281 |
drv = find_protocol(filename); |
282 |
/* no need to test disk image formats for vvfat */
|
283 |
if (drv == &bdrv_vvfat)
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return drv;
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285 |
|
286 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
287 |
if (ret < 0) |
288 |
return NULL; |
289 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
290 |
bdrv_delete(bs); |
291 |
if (ret < 0) { |
292 |
return NULL; |
293 |
} |
294 |
|
295 |
score_max = 0;
|
296 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
297 |
if (drv1->bdrv_probe) {
|
298 |
score = drv1->bdrv_probe(buf, ret, filename); |
299 |
if (score > score_max) {
|
300 |
score_max = score; |
301 |
drv = drv1; |
302 |
} |
303 |
} |
304 |
} |
305 |
return drv;
|
306 |
} |
307 |
|
308 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
309 |
{ |
310 |
BlockDriverState *bs; |
311 |
int ret;
|
312 |
|
313 |
bs = bdrv_new("");
|
314 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
315 |
if (ret < 0) { |
316 |
bdrv_delete(bs); |
317 |
return ret;
|
318 |
} |
319 |
bs->growable = 1;
|
320 |
*pbs = bs; |
321 |
return 0; |
322 |
} |
323 |
|
324 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
325 |
{ |
326 |
return bdrv_open2(bs, filename, flags, NULL); |
327 |
} |
328 |
|
329 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
330 |
BlockDriver *drv) |
331 |
{ |
332 |
int ret, open_flags;
|
333 |
char tmp_filename[PATH_MAX];
|
334 |
char backing_filename[PATH_MAX];
|
335 |
|
336 |
bs->read_only = 0;
|
337 |
bs->is_temporary = 0;
|
338 |
bs->encrypted = 0;
|
339 |
bs->valid_key = 0;
|
340 |
|
341 |
if (flags & BDRV_O_SNAPSHOT) {
|
342 |
BlockDriverState *bs1; |
343 |
int64_t total_size; |
344 |
int is_protocol = 0; |
345 |
|
346 |
/* if snapshot, we create a temporary backing file and open it
|
347 |
instead of opening 'filename' directly */
|
348 |
|
349 |
/* if there is a backing file, use it */
|
350 |
bs1 = bdrv_new("");
|
351 |
ret = bdrv_open(bs1, filename, 0);
|
352 |
if (ret < 0) { |
353 |
bdrv_delete(bs1); |
354 |
return ret;
|
355 |
} |
356 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
357 |
|
358 |
if (bs1->drv && bs1->drv->protocol_name)
|
359 |
is_protocol = 1;
|
360 |
|
361 |
bdrv_delete(bs1); |
362 |
|
363 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
364 |
|
365 |
/* Real path is meaningless for protocols */
|
366 |
if (is_protocol)
|
367 |
snprintf(backing_filename, sizeof(backing_filename),
|
368 |
"%s", filename);
|
369 |
else
|
370 |
realpath(filename, backing_filename); |
371 |
|
372 |
ret = bdrv_create(&bdrv_qcow2, tmp_filename, |
373 |
total_size, backing_filename, 0);
|
374 |
if (ret < 0) { |
375 |
return ret;
|
376 |
} |
377 |
filename = tmp_filename; |
378 |
bs->is_temporary = 1;
|
379 |
} |
380 |
|
381 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
382 |
if (flags & BDRV_O_FILE) {
|
383 |
drv = find_protocol(filename); |
384 |
} else if (!drv) { |
385 |
drv = find_image_format(filename); |
386 |
} |
387 |
if (!drv) {
|
388 |
ret = -ENOENT; |
389 |
goto unlink_and_fail;
|
390 |
} |
391 |
bs->drv = drv; |
392 |
bs->opaque = qemu_mallocz(drv->instance_size); |
393 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
394 |
RDONLY as fallback */
|
395 |
if (!(flags & BDRV_O_FILE))
|
396 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
397 |
else
|
398 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
399 |
ret = drv->bdrv_open(bs, filename, open_flags); |
400 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
401 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
402 |
bs->read_only = 1;
|
403 |
} |
404 |
if (ret < 0) { |
405 |
qemu_free(bs->opaque); |
406 |
bs->opaque = NULL;
|
407 |
bs->drv = NULL;
|
408 |
unlink_and_fail:
|
409 |
if (bs->is_temporary)
|
410 |
unlink(filename); |
411 |
return ret;
|
412 |
} |
413 |
if (drv->bdrv_getlength) {
|
414 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
415 |
} |
416 |
#ifndef _WIN32
|
417 |
if (bs->is_temporary) {
|
418 |
unlink(filename); |
419 |
} |
420 |
#endif
|
421 |
if (bs->backing_file[0] != '\0') { |
422 |
/* if there is a backing file, use it */
|
423 |
bs->backing_hd = bdrv_new("");
|
424 |
path_combine(backing_filename, sizeof(backing_filename),
|
425 |
filename, bs->backing_file); |
426 |
ret = bdrv_open(bs->backing_hd, backing_filename, open_flags); |
427 |
if (ret < 0) { |
428 |
bdrv_close(bs); |
429 |
return ret;
|
430 |
} |
431 |
} |
432 |
|
433 |
if (!bdrv_key_required(bs)) {
|
434 |
/* call the change callback */
|
435 |
bs->media_changed = 1;
|
436 |
if (bs->change_cb)
|
437 |
bs->change_cb(bs->change_opaque); |
438 |
} |
439 |
return 0; |
440 |
} |
441 |
|
442 |
void bdrv_close(BlockDriverState *bs)
|
443 |
{ |
444 |
if (bs->drv) {
|
445 |
if (bs->backing_hd)
|
446 |
bdrv_delete(bs->backing_hd); |
447 |
bs->drv->bdrv_close(bs); |
448 |
qemu_free(bs->opaque); |
449 |
#ifdef _WIN32
|
450 |
if (bs->is_temporary) {
|
451 |
unlink(bs->filename); |
452 |
} |
453 |
#endif
|
454 |
bs->opaque = NULL;
|
455 |
bs->drv = NULL;
|
456 |
|
457 |
/* call the change callback */
|
458 |
bs->media_changed = 1;
|
459 |
if (bs->change_cb)
|
460 |
bs->change_cb(bs->change_opaque); |
461 |
} |
462 |
} |
463 |
|
464 |
void bdrv_delete(BlockDriverState *bs)
|
465 |
{ |
466 |
BlockDriverState **pbs; |
467 |
|
468 |
pbs = &bdrv_first; |
469 |
while (*pbs != bs && *pbs != NULL) |
470 |
pbs = &(*pbs)->next; |
471 |
if (*pbs == bs)
|
472 |
*pbs = bs->next; |
473 |
|
474 |
bdrv_close(bs); |
475 |
qemu_free(bs); |
476 |
} |
477 |
|
478 |
/* commit COW file into the raw image */
|
479 |
int bdrv_commit(BlockDriverState *bs)
|
480 |
{ |
481 |
BlockDriver *drv = bs->drv; |
482 |
int64_t i, total_sectors; |
483 |
int n, j;
|
484 |
unsigned char sector[512]; |
485 |
|
486 |
if (!drv)
|
487 |
return -ENOMEDIUM;
|
488 |
|
489 |
if (bs->read_only) {
|
490 |
return -EACCES;
|
491 |
} |
492 |
|
493 |
if (!bs->backing_hd) {
|
494 |
return -ENOTSUP;
|
495 |
} |
496 |
|
497 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
498 |
for (i = 0; i < total_sectors;) { |
499 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
500 |
for(j = 0; j < n; j++) { |
501 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
502 |
return -EIO;
|
503 |
} |
504 |
|
505 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
506 |
return -EIO;
|
507 |
} |
508 |
i++; |
509 |
} |
510 |
} else {
|
511 |
i += n; |
512 |
} |
513 |
} |
514 |
|
515 |
if (drv->bdrv_make_empty)
|
516 |
return drv->bdrv_make_empty(bs);
|
517 |
|
518 |
return 0; |
519 |
} |
520 |
|
521 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
522 |
size_t size) |
523 |
{ |
524 |
int64_t len; |
525 |
|
526 |
if (!bdrv_is_inserted(bs))
|
527 |
return -ENOMEDIUM;
|
528 |
|
529 |
if (bs->growable)
|
530 |
return 0; |
531 |
|
532 |
len = bdrv_getlength(bs); |
533 |
|
534 |
if ((offset + size) > len)
|
535 |
return -EIO;
|
536 |
|
537 |
return 0; |
538 |
} |
539 |
|
540 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
541 |
int nb_sectors)
|
542 |
{ |
543 |
int64_t offset; |
544 |
|
545 |
/* Deal with byte accesses */
|
546 |
if (sector_num < 0) |
547 |
offset = -sector_num; |
548 |
else
|
549 |
offset = sector_num * 512;
|
550 |
|
551 |
return bdrv_check_byte_request(bs, offset, nb_sectors * 512); |
552 |
} |
553 |
|
554 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
555 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
556 |
uint8_t *buf, int nb_sectors)
|
557 |
{ |
558 |
BlockDriver *drv = bs->drv; |
559 |
|
560 |
if (!drv)
|
561 |
return -ENOMEDIUM;
|
562 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
563 |
return -EIO;
|
564 |
|
565 |
if (drv->bdrv_pread) {
|
566 |
int ret, len;
|
567 |
len = nb_sectors * 512;
|
568 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
569 |
if (ret < 0) |
570 |
return ret;
|
571 |
else if (ret != len) |
572 |
return -EINVAL;
|
573 |
else {
|
574 |
bs->rd_bytes += (unsigned) len;
|
575 |
bs->rd_ops ++; |
576 |
return 0; |
577 |
} |
578 |
} else {
|
579 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
580 |
} |
581 |
} |
582 |
|
583 |
/* Return < 0 if error. Important errors are:
|
584 |
-EIO generic I/O error (may happen for all errors)
|
585 |
-ENOMEDIUM No media inserted.
|
586 |
-EINVAL Invalid sector number or nb_sectors
|
587 |
-EACCES Trying to write a read-only device
|
588 |
*/
|
589 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
590 |
const uint8_t *buf, int nb_sectors) |
591 |
{ |
592 |
BlockDriver *drv = bs->drv; |
593 |
if (!bs->drv)
|
594 |
return -ENOMEDIUM;
|
595 |
if (bs->read_only)
|
596 |
return -EACCES;
|
597 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
598 |
return -EIO;
|
599 |
|
600 |
if (drv->bdrv_pwrite) {
|
601 |
int ret, len, count = 0; |
602 |
len = nb_sectors * 512;
|
603 |
do {
|
604 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count);
|
605 |
if (ret < 0) { |
606 |
printf("bdrv_write ret=%d\n", ret);
|
607 |
return ret;
|
608 |
} |
609 |
count += ret; |
610 |
buf += ret; |
611 |
} while (count != len);
|
612 |
bs->wr_bytes += (unsigned) len;
|
613 |
bs->wr_ops ++; |
614 |
return 0; |
615 |
} |
616 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
617 |
} |
618 |
|
619 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
620 |
uint8_t *buf, int count1)
|
621 |
{ |
622 |
uint8_t tmp_buf[SECTOR_SIZE]; |
623 |
int len, nb_sectors, count;
|
624 |
int64_t sector_num; |
625 |
|
626 |
count = count1; |
627 |
/* first read to align to sector start */
|
628 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
629 |
if (len > count)
|
630 |
len = count; |
631 |
sector_num = offset >> SECTOR_BITS; |
632 |
if (len > 0) { |
633 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
634 |
return -EIO;
|
635 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
636 |
count -= len; |
637 |
if (count == 0) |
638 |
return count1;
|
639 |
sector_num++; |
640 |
buf += len; |
641 |
} |
642 |
|
643 |
/* read the sectors "in place" */
|
644 |
nb_sectors = count >> SECTOR_BITS; |
645 |
if (nb_sectors > 0) { |
646 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
647 |
return -EIO;
|
648 |
sector_num += nb_sectors; |
649 |
len = nb_sectors << SECTOR_BITS; |
650 |
buf += len; |
651 |
count -= len; |
652 |
} |
653 |
|
654 |
/* add data from the last sector */
|
655 |
if (count > 0) { |
656 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
657 |
return -EIO;
|
658 |
memcpy(buf, tmp_buf, count); |
659 |
} |
660 |
return count1;
|
661 |
} |
662 |
|
663 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
664 |
const uint8_t *buf, int count1) |
665 |
{ |
666 |
uint8_t tmp_buf[SECTOR_SIZE]; |
667 |
int len, nb_sectors, count;
|
668 |
int64_t sector_num; |
669 |
|
670 |
count = count1; |
671 |
/* first write to align to sector start */
|
672 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
673 |
if (len > count)
|
674 |
len = count; |
675 |
sector_num = offset >> SECTOR_BITS; |
676 |
if (len > 0) { |
677 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
678 |
return -EIO;
|
679 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
680 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
681 |
return -EIO;
|
682 |
count -= len; |
683 |
if (count == 0) |
684 |
return count1;
|
685 |
sector_num++; |
686 |
buf += len; |
687 |
} |
688 |
|
689 |
/* write the sectors "in place" */
|
690 |
nb_sectors = count >> SECTOR_BITS; |
691 |
if (nb_sectors > 0) { |
692 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
693 |
return -EIO;
|
694 |
sector_num += nb_sectors; |
695 |
len = nb_sectors << SECTOR_BITS; |
696 |
buf += len; |
697 |
count -= len; |
698 |
} |
699 |
|
700 |
/* add data from the last sector */
|
701 |
if (count > 0) { |
702 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
703 |
return -EIO;
|
704 |
memcpy(tmp_buf, buf, count); |
705 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
706 |
return -EIO;
|
707 |
} |
708 |
return count1;
|
709 |
} |
710 |
|
711 |
/**
|
712 |
* Read with byte offsets (needed only for file protocols)
|
713 |
*/
|
714 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
715 |
void *buf1, int count1) |
716 |
{ |
717 |
BlockDriver *drv = bs->drv; |
718 |
|
719 |
if (!drv)
|
720 |
return -ENOMEDIUM;
|
721 |
if (bdrv_check_byte_request(bs, offset, count1))
|
722 |
return -EIO;
|
723 |
|
724 |
if (!drv->bdrv_pread)
|
725 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
726 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
727 |
} |
728 |
|
729 |
/**
|
730 |
* Write with byte offsets (needed only for file protocols)
|
731 |
*/
|
732 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
733 |
const void *buf1, int count1) |
734 |
{ |
735 |
BlockDriver *drv = bs->drv; |
736 |
|
737 |
if (!drv)
|
738 |
return -ENOMEDIUM;
|
739 |
if (bdrv_check_byte_request(bs, offset, count1))
|
740 |
return -EIO;
|
741 |
|
742 |
if (!drv->bdrv_pwrite)
|
743 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
744 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
745 |
} |
746 |
|
747 |
/**
|
748 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
749 |
*/
|
750 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
751 |
{ |
752 |
BlockDriver *drv = bs->drv; |
753 |
if (!drv)
|
754 |
return -ENOMEDIUM;
|
755 |
if (!drv->bdrv_truncate)
|
756 |
return -ENOTSUP;
|
757 |
return drv->bdrv_truncate(bs, offset);
|
758 |
} |
759 |
|
760 |
/**
|
761 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
762 |
*/
|
763 |
int64_t bdrv_getlength(BlockDriverState *bs) |
764 |
{ |
765 |
BlockDriver *drv = bs->drv; |
766 |
if (!drv)
|
767 |
return -ENOMEDIUM;
|
768 |
if (!drv->bdrv_getlength) {
|
769 |
/* legacy mode */
|
770 |
return bs->total_sectors * SECTOR_SIZE;
|
771 |
} |
772 |
return drv->bdrv_getlength(bs);
|
773 |
} |
774 |
|
775 |
/* return 0 as number of sectors if no device present or error */
|
776 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
777 |
{ |
778 |
int64_t length; |
779 |
length = bdrv_getlength(bs); |
780 |
if (length < 0) |
781 |
length = 0;
|
782 |
else
|
783 |
length = length >> SECTOR_BITS; |
784 |
*nb_sectors_ptr = length; |
785 |
} |
786 |
|
787 |
struct partition {
|
788 |
uint8_t boot_ind; /* 0x80 - active */
|
789 |
uint8_t head; /* starting head */
|
790 |
uint8_t sector; /* starting sector */
|
791 |
uint8_t cyl; /* starting cylinder */
|
792 |
uint8_t sys_ind; /* What partition type */
|
793 |
uint8_t end_head; /* end head */
|
794 |
uint8_t end_sector; /* end sector */
|
795 |
uint8_t end_cyl; /* end cylinder */
|
796 |
uint32_t start_sect; /* starting sector counting from 0 */
|
797 |
uint32_t nr_sects; /* nr of sectors in partition */
|
798 |
} __attribute__((packed)); |
799 |
|
800 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
801 |
static int guess_disk_lchs(BlockDriverState *bs, |
802 |
int *pcylinders, int *pheads, int *psectors) |
803 |
{ |
804 |
uint8_t buf[512];
|
805 |
int ret, i, heads, sectors, cylinders;
|
806 |
struct partition *p;
|
807 |
uint32_t nr_sects; |
808 |
uint64_t nb_sectors; |
809 |
|
810 |
bdrv_get_geometry(bs, &nb_sectors); |
811 |
|
812 |
ret = bdrv_read(bs, 0, buf, 1); |
813 |
if (ret < 0) |
814 |
return -1; |
815 |
/* test msdos magic */
|
816 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
817 |
return -1; |
818 |
for(i = 0; i < 4; i++) { |
819 |
p = ((struct partition *)(buf + 0x1be)) + i; |
820 |
nr_sects = le32_to_cpu(p->nr_sects); |
821 |
if (nr_sects && p->end_head) {
|
822 |
/* We make the assumption that the partition terminates on
|
823 |
a cylinder boundary */
|
824 |
heads = p->end_head + 1;
|
825 |
sectors = p->end_sector & 63;
|
826 |
if (sectors == 0) |
827 |
continue;
|
828 |
cylinders = nb_sectors / (heads * sectors); |
829 |
if (cylinders < 1 || cylinders > 16383) |
830 |
continue;
|
831 |
*pheads = heads; |
832 |
*psectors = sectors; |
833 |
*pcylinders = cylinders; |
834 |
#if 0
|
835 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
836 |
cylinders, heads, sectors);
|
837 |
#endif
|
838 |
return 0; |
839 |
} |
840 |
} |
841 |
return -1; |
842 |
} |
843 |
|
844 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
845 |
{ |
846 |
int translation, lba_detected = 0; |
847 |
int cylinders, heads, secs;
|
848 |
uint64_t nb_sectors; |
849 |
|
850 |
/* if a geometry hint is available, use it */
|
851 |
bdrv_get_geometry(bs, &nb_sectors); |
852 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
853 |
translation = bdrv_get_translation_hint(bs); |
854 |
if (cylinders != 0) { |
855 |
*pcyls = cylinders; |
856 |
*pheads = heads; |
857 |
*psecs = secs; |
858 |
} else {
|
859 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
860 |
if (heads > 16) { |
861 |
/* if heads > 16, it means that a BIOS LBA
|
862 |
translation was active, so the default
|
863 |
hardware geometry is OK */
|
864 |
lba_detected = 1;
|
865 |
goto default_geometry;
|
866 |
} else {
|
867 |
*pcyls = cylinders; |
868 |
*pheads = heads; |
869 |
*psecs = secs; |
870 |
/* disable any translation to be in sync with
|
871 |
the logical geometry */
|
872 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
873 |
bdrv_set_translation_hint(bs, |
874 |
BIOS_ATA_TRANSLATION_NONE); |
875 |
} |
876 |
} |
877 |
} else {
|
878 |
default_geometry:
|
879 |
/* if no geometry, use a standard physical disk geometry */
|
880 |
cylinders = nb_sectors / (16 * 63); |
881 |
|
882 |
if (cylinders > 16383) |
883 |
cylinders = 16383;
|
884 |
else if (cylinders < 2) |
885 |
cylinders = 2;
|
886 |
*pcyls = cylinders; |
887 |
*pheads = 16;
|
888 |
*psecs = 63;
|
889 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
890 |
if ((*pcyls * *pheads) <= 131072) { |
891 |
bdrv_set_translation_hint(bs, |
892 |
BIOS_ATA_TRANSLATION_LARGE); |
893 |
} else {
|
894 |
bdrv_set_translation_hint(bs, |
895 |
BIOS_ATA_TRANSLATION_LBA); |
896 |
} |
897 |
} |
898 |
} |
899 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
900 |
} |
901 |
} |
902 |
|
903 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
904 |
int cyls, int heads, int secs) |
905 |
{ |
906 |
bs->cyls = cyls; |
907 |
bs->heads = heads; |
908 |
bs->secs = secs; |
909 |
} |
910 |
|
911 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
912 |
{ |
913 |
bs->type = type; |
914 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
915 |
type == BDRV_TYPE_FLOPPY)); |
916 |
} |
917 |
|
918 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
919 |
{ |
920 |
bs->translation = translation; |
921 |
} |
922 |
|
923 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
924 |
int *pcyls, int *pheads, int *psecs) |
925 |
{ |
926 |
*pcyls = bs->cyls; |
927 |
*pheads = bs->heads; |
928 |
*psecs = bs->secs; |
929 |
} |
930 |
|
931 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
932 |
{ |
933 |
return bs->type;
|
934 |
} |
935 |
|
936 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
937 |
{ |
938 |
return bs->translation;
|
939 |
} |
940 |
|
941 |
int bdrv_is_removable(BlockDriverState *bs)
|
942 |
{ |
943 |
return bs->removable;
|
944 |
} |
945 |
|
946 |
int bdrv_is_read_only(BlockDriverState *bs)
|
947 |
{ |
948 |
return bs->read_only;
|
949 |
} |
950 |
|
951 |
int bdrv_is_sg(BlockDriverState *bs)
|
952 |
{ |
953 |
return bs->sg;
|
954 |
} |
955 |
|
956 |
/* XXX: no longer used */
|
957 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
958 |
void (*change_cb)(void *opaque), void *opaque) |
959 |
{ |
960 |
bs->change_cb = change_cb; |
961 |
bs->change_opaque = opaque; |
962 |
} |
963 |
|
964 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
965 |
{ |
966 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
967 |
return 1; |
968 |
return bs->encrypted;
|
969 |
} |
970 |
|
971 |
int bdrv_key_required(BlockDriverState *bs)
|
972 |
{ |
973 |
BlockDriverState *backing_hd = bs->backing_hd; |
974 |
|
975 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
976 |
return 1; |
977 |
return (bs->encrypted && !bs->valid_key);
|
978 |
} |
979 |
|
980 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
981 |
{ |
982 |
int ret;
|
983 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
984 |
ret = bdrv_set_key(bs->backing_hd, key); |
985 |
if (ret < 0) |
986 |
return ret;
|
987 |
if (!bs->encrypted)
|
988 |
return 0; |
989 |
} |
990 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
991 |
return -1; |
992 |
ret = bs->drv->bdrv_set_key(bs, key); |
993 |
if (ret < 0) { |
994 |
bs->valid_key = 0;
|
995 |
} else if (!bs->valid_key) { |
996 |
bs->valid_key = 1;
|
997 |
/* call the change callback now, we skipped it on open */
|
998 |
bs->media_changed = 1;
|
999 |
if (bs->change_cb)
|
1000 |
bs->change_cb(bs->change_opaque); |
1001 |
} |
1002 |
return ret;
|
1003 |
} |
1004 |
|
1005 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1006 |
{ |
1007 |
if (!bs->drv) {
|
1008 |
buf[0] = '\0'; |
1009 |
} else {
|
1010 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
1011 |
} |
1012 |
} |
1013 |
|
1014 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1015 |
void *opaque)
|
1016 |
{ |
1017 |
BlockDriver *drv; |
1018 |
|
1019 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
1020 |
it(opaque, drv->format_name); |
1021 |
} |
1022 |
} |
1023 |
|
1024 |
BlockDriverState *bdrv_find(const char *name) |
1025 |
{ |
1026 |
BlockDriverState *bs; |
1027 |
|
1028 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1029 |
if (!strcmp(name, bs->device_name))
|
1030 |
return bs;
|
1031 |
} |
1032 |
return NULL; |
1033 |
} |
1034 |
|
1035 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1036 |
{ |
1037 |
BlockDriverState *bs; |
1038 |
|
1039 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1040 |
it(opaque, bs); |
1041 |
} |
1042 |
} |
1043 |
|
1044 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1045 |
{ |
1046 |
return bs->device_name;
|
1047 |
} |
1048 |
|
1049 |
void bdrv_flush(BlockDriverState *bs)
|
1050 |
{ |
1051 |
if (bs->drv->bdrv_flush)
|
1052 |
bs->drv->bdrv_flush(bs); |
1053 |
if (bs->backing_hd)
|
1054 |
bdrv_flush(bs->backing_hd); |
1055 |
} |
1056 |
|
1057 |
void bdrv_flush_all(void) |
1058 |
{ |
1059 |
BlockDriverState *bs; |
1060 |
|
1061 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1062 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1063 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1064 |
bdrv_flush(bs); |
1065 |
} |
1066 |
|
1067 |
/*
|
1068 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1069 |
* not implementing the functionality are assumed to not support backing files,
|
1070 |
* hence all their sectors are reported as allocated.
|
1071 |
*
|
1072 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1073 |
* the specified sector) that are known to be in the same
|
1074 |
* allocated/unallocated state.
|
1075 |
*
|
1076 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1077 |
*/
|
1078 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1079 |
int *pnum)
|
1080 |
{ |
1081 |
int64_t n; |
1082 |
if (!bs->drv->bdrv_is_allocated) {
|
1083 |
if (sector_num >= bs->total_sectors) {
|
1084 |
*pnum = 0;
|
1085 |
return 0; |
1086 |
} |
1087 |
n = bs->total_sectors - sector_num; |
1088 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1089 |
return 1; |
1090 |
} |
1091 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1092 |
} |
1093 |
|
1094 |
void bdrv_info(Monitor *mon)
|
1095 |
{ |
1096 |
BlockDriverState *bs; |
1097 |
|
1098 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1099 |
monitor_printf(mon, "%s:", bs->device_name);
|
1100 |
monitor_printf(mon, " type=");
|
1101 |
switch(bs->type) {
|
1102 |
case BDRV_TYPE_HD:
|
1103 |
monitor_printf(mon, "hd");
|
1104 |
break;
|
1105 |
case BDRV_TYPE_CDROM:
|
1106 |
monitor_printf(mon, "cdrom");
|
1107 |
break;
|
1108 |
case BDRV_TYPE_FLOPPY:
|
1109 |
monitor_printf(mon, "floppy");
|
1110 |
break;
|
1111 |
} |
1112 |
monitor_printf(mon, " removable=%d", bs->removable);
|
1113 |
if (bs->removable) {
|
1114 |
monitor_printf(mon, " locked=%d", bs->locked);
|
1115 |
} |
1116 |
if (bs->drv) {
|
1117 |
monitor_printf(mon, " file=");
|
1118 |
monitor_print_filename(mon, bs->filename); |
1119 |
if (bs->backing_file[0] != '\0') { |
1120 |
monitor_printf(mon, " backing_file=");
|
1121 |
monitor_print_filename(mon, bs->backing_file); |
1122 |
} |
1123 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
1124 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
1125 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
1126 |
} else {
|
1127 |
monitor_printf(mon, " [not inserted]");
|
1128 |
} |
1129 |
monitor_printf(mon, "\n");
|
1130 |
} |
1131 |
} |
1132 |
|
1133 |
/* The "info blockstats" command. */
|
1134 |
void bdrv_info_stats(Monitor *mon)
|
1135 |
{ |
1136 |
BlockDriverState *bs; |
1137 |
BlockDriverInfo bdi; |
1138 |
|
1139 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1140 |
monitor_printf(mon, "%s:"
|
1141 |
" rd_bytes=%" PRIu64
|
1142 |
" wr_bytes=%" PRIu64
|
1143 |
" rd_operations=%" PRIu64
|
1144 |
" wr_operations=%" PRIu64
|
1145 |
, |
1146 |
bs->device_name, |
1147 |
bs->rd_bytes, bs->wr_bytes, |
1148 |
bs->rd_ops, bs->wr_ops); |
1149 |
if (bdrv_get_info(bs, &bdi) == 0) |
1150 |
monitor_printf(mon, " high=%" PRId64
|
1151 |
" bytes_free=%" PRId64,
|
1152 |
bdi.highest_alloc, bdi.num_free_bytes); |
1153 |
monitor_printf(mon, "\n");
|
1154 |
} |
1155 |
} |
1156 |
|
1157 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1158 |
{ |
1159 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1160 |
return bs->backing_file;
|
1161 |
else if (bs->encrypted) |
1162 |
return bs->filename;
|
1163 |
else
|
1164 |
return NULL; |
1165 |
} |
1166 |
|
1167 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1168 |
char *filename, int filename_size) |
1169 |
{ |
1170 |
if (!bs->backing_hd) {
|
1171 |
pstrcpy(filename, filename_size, "");
|
1172 |
} else {
|
1173 |
pstrcpy(filename, filename_size, bs->backing_file); |
1174 |
} |
1175 |
} |
1176 |
|
1177 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1178 |
const uint8_t *buf, int nb_sectors) |
1179 |
{ |
1180 |
BlockDriver *drv = bs->drv; |
1181 |
if (!drv)
|
1182 |
return -ENOMEDIUM;
|
1183 |
if (!drv->bdrv_write_compressed)
|
1184 |
return -ENOTSUP;
|
1185 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1186 |
} |
1187 |
|
1188 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1189 |
{ |
1190 |
BlockDriver *drv = bs->drv; |
1191 |
if (!drv)
|
1192 |
return -ENOMEDIUM;
|
1193 |
if (!drv->bdrv_get_info)
|
1194 |
return -ENOTSUP;
|
1195 |
memset(bdi, 0, sizeof(*bdi)); |
1196 |
return drv->bdrv_get_info(bs, bdi);
|
1197 |
} |
1198 |
|
1199 |
/**************************************************************/
|
1200 |
/* handling of snapshots */
|
1201 |
|
1202 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1203 |
QEMUSnapshotInfo *sn_info) |
1204 |
{ |
1205 |
BlockDriver *drv = bs->drv; |
1206 |
if (!drv)
|
1207 |
return -ENOMEDIUM;
|
1208 |
if (!drv->bdrv_snapshot_create)
|
1209 |
return -ENOTSUP;
|
1210 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1211 |
} |
1212 |
|
1213 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1214 |
const char *snapshot_id) |
1215 |
{ |
1216 |
BlockDriver *drv = bs->drv; |
1217 |
if (!drv)
|
1218 |
return -ENOMEDIUM;
|
1219 |
if (!drv->bdrv_snapshot_goto)
|
1220 |
return -ENOTSUP;
|
1221 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1222 |
} |
1223 |
|
1224 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1225 |
{ |
1226 |
BlockDriver *drv = bs->drv; |
1227 |
if (!drv)
|
1228 |
return -ENOMEDIUM;
|
1229 |
if (!drv->bdrv_snapshot_delete)
|
1230 |
return -ENOTSUP;
|
1231 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1232 |
} |
1233 |
|
1234 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1235 |
QEMUSnapshotInfo **psn_info) |
1236 |
{ |
1237 |
BlockDriver *drv = bs->drv; |
1238 |
if (!drv)
|
1239 |
return -ENOMEDIUM;
|
1240 |
if (!drv->bdrv_snapshot_list)
|
1241 |
return -ENOTSUP;
|
1242 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1243 |
} |
1244 |
|
1245 |
#define NB_SUFFIXES 4 |
1246 |
|
1247 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1248 |
{ |
1249 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1250 |
int64_t base; |
1251 |
int i;
|
1252 |
|
1253 |
if (size <= 999) { |
1254 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1255 |
} else {
|
1256 |
base = 1024;
|
1257 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1258 |
if (size < (10 * base)) { |
1259 |
snprintf(buf, buf_size, "%0.1f%c",
|
1260 |
(double)size / base,
|
1261 |
suffixes[i]); |
1262 |
break;
|
1263 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1264 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1265 |
((size + (base >> 1)) / base),
|
1266 |
suffixes[i]); |
1267 |
break;
|
1268 |
} |
1269 |
base = base * 1024;
|
1270 |
} |
1271 |
} |
1272 |
return buf;
|
1273 |
} |
1274 |
|
1275 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1276 |
{ |
1277 |
char buf1[128], date_buf[128], clock_buf[128]; |
1278 |
#ifdef _WIN32
|
1279 |
struct tm *ptm;
|
1280 |
#else
|
1281 |
struct tm tm;
|
1282 |
#endif
|
1283 |
time_t ti; |
1284 |
int64_t secs; |
1285 |
|
1286 |
if (!sn) {
|
1287 |
snprintf(buf, buf_size, |
1288 |
"%-10s%-20s%7s%20s%15s",
|
1289 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1290 |
} else {
|
1291 |
ti = sn->date_sec; |
1292 |
#ifdef _WIN32
|
1293 |
ptm = localtime(&ti); |
1294 |
strftime(date_buf, sizeof(date_buf),
|
1295 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1296 |
#else
|
1297 |
localtime_r(&ti, &tm); |
1298 |
strftime(date_buf, sizeof(date_buf),
|
1299 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1300 |
#endif
|
1301 |
secs = sn->vm_clock_nsec / 1000000000;
|
1302 |
snprintf(clock_buf, sizeof(clock_buf),
|
1303 |
"%02d:%02d:%02d.%03d",
|
1304 |
(int)(secs / 3600), |
1305 |
(int)((secs / 60) % 60), |
1306 |
(int)(secs % 60), |
1307 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1308 |
snprintf(buf, buf_size, |
1309 |
"%-10s%-20s%7s%20s%15s",
|
1310 |
sn->id_str, sn->name, |
1311 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1312 |
date_buf, |
1313 |
clock_buf); |
1314 |
} |
1315 |
return buf;
|
1316 |
} |
1317 |
|
1318 |
|
1319 |
/**************************************************************/
|
1320 |
/* async I/Os */
|
1321 |
|
1322 |
typedef struct VectorTranslationState { |
1323 |
QEMUIOVector *iov; |
1324 |
uint8_t *bounce; |
1325 |
int is_write;
|
1326 |
BlockDriverAIOCB *aiocb; |
1327 |
BlockDriverAIOCB *this_aiocb; |
1328 |
} VectorTranslationState; |
1329 |
|
1330 |
static void bdrv_aio_rw_vector_cb(void *opaque, int ret) |
1331 |
{ |
1332 |
VectorTranslationState *s = opaque; |
1333 |
|
1334 |
if (!s->is_write) {
|
1335 |
qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size); |
1336 |
} |
1337 |
qemu_vfree(s->bounce); |
1338 |
s->this_aiocb->cb(s->this_aiocb->opaque, ret); |
1339 |
qemu_aio_release(s->this_aiocb); |
1340 |
} |
1341 |
|
1342 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1343 |
int64_t sector_num, |
1344 |
QEMUIOVector *iov, |
1345 |
int nb_sectors,
|
1346 |
BlockDriverCompletionFunc *cb, |
1347 |
void *opaque,
|
1348 |
int is_write)
|
1349 |
|
1350 |
{ |
1351 |
VectorTranslationState *s = qemu_mallocz(sizeof(*s));
|
1352 |
BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque); |
1353 |
|
1354 |
s->this_aiocb = aiocb; |
1355 |
s->iov = iov; |
1356 |
s->bounce = qemu_memalign(512, nb_sectors * 512); |
1357 |
s->is_write = is_write; |
1358 |
if (is_write) {
|
1359 |
qemu_iovec_to_buffer(s->iov, s->bounce); |
1360 |
s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors, |
1361 |
bdrv_aio_rw_vector_cb, s); |
1362 |
} else {
|
1363 |
s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors, |
1364 |
bdrv_aio_rw_vector_cb, s); |
1365 |
} |
1366 |
return aiocb;
|
1367 |
} |
1368 |
|
1369 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1370 |
QEMUIOVector *iov, int nb_sectors,
|
1371 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1372 |
{ |
1373 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1374 |
return NULL; |
1375 |
|
1376 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
1377 |
cb, opaque, 0);
|
1378 |
} |
1379 |
|
1380 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1381 |
QEMUIOVector *iov, int nb_sectors,
|
1382 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1383 |
{ |
1384 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1385 |
return NULL; |
1386 |
|
1387 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
1388 |
cb, opaque, 1);
|
1389 |
} |
1390 |
|
1391 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1392 |
uint8_t *buf, int nb_sectors,
|
1393 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1394 |
{ |
1395 |
BlockDriver *drv = bs->drv; |
1396 |
BlockDriverAIOCB *ret; |
1397 |
|
1398 |
if (!drv)
|
1399 |
return NULL; |
1400 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1401 |
return NULL; |
1402 |
|
1403 |
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
1404 |
|
1405 |
if (ret) {
|
1406 |
/* Update stats even though technically transfer has not happened. */
|
1407 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1408 |
bs->rd_ops ++; |
1409 |
} |
1410 |
|
1411 |
return ret;
|
1412 |
} |
1413 |
|
1414 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1415 |
const uint8_t *buf, int nb_sectors, |
1416 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1417 |
{ |
1418 |
BlockDriver *drv = bs->drv; |
1419 |
BlockDriverAIOCB *ret; |
1420 |
|
1421 |
if (!drv)
|
1422 |
return NULL; |
1423 |
if (bs->read_only)
|
1424 |
return NULL; |
1425 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1426 |
return NULL; |
1427 |
|
1428 |
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
1429 |
|
1430 |
if (ret) {
|
1431 |
/* Update stats even though technically transfer has not happened. */
|
1432 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1433 |
bs->wr_ops ++; |
1434 |
} |
1435 |
|
1436 |
return ret;
|
1437 |
} |
1438 |
|
1439 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1440 |
{ |
1441 |
BlockDriver *drv = acb->bs->drv; |
1442 |
|
1443 |
if (acb->cb == bdrv_aio_rw_vector_cb) {
|
1444 |
VectorTranslationState *s = acb->opaque; |
1445 |
acb = s->aiocb; |
1446 |
} |
1447 |
|
1448 |
drv->bdrv_aio_cancel(acb); |
1449 |
} |
1450 |
|
1451 |
|
1452 |
/**************************************************************/
|
1453 |
/* async block device emulation */
|
1454 |
|
1455 |
static void bdrv_aio_bh_cb(void *opaque) |
1456 |
{ |
1457 |
BlockDriverAIOCBSync *acb = opaque; |
1458 |
acb->common.cb(acb->common.opaque, acb->ret); |
1459 |
qemu_aio_release(acb); |
1460 |
} |
1461 |
|
1462 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1463 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1464 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1465 |
{ |
1466 |
BlockDriverAIOCBSync *acb; |
1467 |
int ret;
|
1468 |
|
1469 |
acb = qemu_aio_get(bs, cb, opaque); |
1470 |
if (!acb->bh)
|
1471 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1472 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1473 |
acb->ret = ret; |
1474 |
qemu_bh_schedule(acb->bh); |
1475 |
return &acb->common;
|
1476 |
} |
1477 |
|
1478 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1479 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1480 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1481 |
{ |
1482 |
BlockDriverAIOCBSync *acb; |
1483 |
int ret;
|
1484 |
|
1485 |
acb = qemu_aio_get(bs, cb, opaque); |
1486 |
if (!acb->bh)
|
1487 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1488 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1489 |
acb->ret = ret; |
1490 |
qemu_bh_schedule(acb->bh); |
1491 |
return &acb->common;
|
1492 |
} |
1493 |
|
1494 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1495 |
{ |
1496 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1497 |
qemu_bh_cancel(acb->bh); |
1498 |
qemu_aio_release(acb); |
1499 |
} |
1500 |
|
1501 |
/**************************************************************/
|
1502 |
/* sync block device emulation */
|
1503 |
|
1504 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1505 |
{ |
1506 |
*(int *)opaque = ret;
|
1507 |
} |
1508 |
|
1509 |
#define NOT_DONE 0x7fffffff |
1510 |
|
1511 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1512 |
uint8_t *buf, int nb_sectors)
|
1513 |
{ |
1514 |
int async_ret;
|
1515 |
BlockDriverAIOCB *acb; |
1516 |
|
1517 |
async_ret = NOT_DONE; |
1518 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
1519 |
bdrv_rw_em_cb, &async_ret); |
1520 |
if (acb == NULL) |
1521 |
return -1; |
1522 |
|
1523 |
while (async_ret == NOT_DONE) {
|
1524 |
qemu_aio_wait(); |
1525 |
} |
1526 |
|
1527 |
return async_ret;
|
1528 |
} |
1529 |
|
1530 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1531 |
const uint8_t *buf, int nb_sectors) |
1532 |
{ |
1533 |
int async_ret;
|
1534 |
BlockDriverAIOCB *acb; |
1535 |
|
1536 |
async_ret = NOT_DONE; |
1537 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
1538 |
bdrv_rw_em_cb, &async_ret); |
1539 |
if (acb == NULL) |
1540 |
return -1; |
1541 |
while (async_ret == NOT_DONE) {
|
1542 |
qemu_aio_wait(); |
1543 |
} |
1544 |
return async_ret;
|
1545 |
} |
1546 |
|
1547 |
void bdrv_init(void) |
1548 |
{ |
1549 |
bdrv_register(&bdrv_raw); |
1550 |
bdrv_register(&bdrv_host_device); |
1551 |
#ifndef _WIN32
|
1552 |
bdrv_register(&bdrv_cow); |
1553 |
#endif
|
1554 |
bdrv_register(&bdrv_qcow); |
1555 |
bdrv_register(&bdrv_vmdk); |
1556 |
bdrv_register(&bdrv_cloop); |
1557 |
bdrv_register(&bdrv_dmg); |
1558 |
bdrv_register(&bdrv_bochs); |
1559 |
bdrv_register(&bdrv_vpc); |
1560 |
bdrv_register(&bdrv_vvfat); |
1561 |
bdrv_register(&bdrv_qcow2); |
1562 |
bdrv_register(&bdrv_parallels); |
1563 |
bdrv_register(&bdrv_nbd); |
1564 |
} |
1565 |
|
1566 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
1567 |
void *opaque)
|
1568 |
{ |
1569 |
BlockDriver *drv; |
1570 |
BlockDriverAIOCB *acb; |
1571 |
|
1572 |
drv = bs->drv; |
1573 |
if (drv->free_aiocb) {
|
1574 |
acb = drv->free_aiocb; |
1575 |
drv->free_aiocb = acb->next; |
1576 |
} else {
|
1577 |
acb = qemu_mallocz(drv->aiocb_size); |
1578 |
} |
1579 |
acb->bs = bs; |
1580 |
acb->cb = cb; |
1581 |
acb->opaque = opaque; |
1582 |
return acb;
|
1583 |
} |
1584 |
|
1585 |
void qemu_aio_release(void *p) |
1586 |
{ |
1587 |
BlockDriverAIOCB *acb = p; |
1588 |
BlockDriver *drv = acb->bs->drv; |
1589 |
acb->next = drv->free_aiocb; |
1590 |
drv->free_aiocb = acb; |
1591 |
} |
1592 |
|
1593 |
/**************************************************************/
|
1594 |
/* removable device support */
|
1595 |
|
1596 |
/**
|
1597 |
* Return TRUE if the media is present
|
1598 |
*/
|
1599 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1600 |
{ |
1601 |
BlockDriver *drv = bs->drv; |
1602 |
int ret;
|
1603 |
if (!drv)
|
1604 |
return 0; |
1605 |
if (!drv->bdrv_is_inserted)
|
1606 |
return 1; |
1607 |
ret = drv->bdrv_is_inserted(bs); |
1608 |
return ret;
|
1609 |
} |
1610 |
|
1611 |
/**
|
1612 |
* Return TRUE if the media changed since the last call to this
|
1613 |
* function. It is currently only used for floppy disks
|
1614 |
*/
|
1615 |
int bdrv_media_changed(BlockDriverState *bs)
|
1616 |
{ |
1617 |
BlockDriver *drv = bs->drv; |
1618 |
int ret;
|
1619 |
|
1620 |
if (!drv || !drv->bdrv_media_changed)
|
1621 |
ret = -ENOTSUP; |
1622 |
else
|
1623 |
ret = drv->bdrv_media_changed(bs); |
1624 |
if (ret == -ENOTSUP)
|
1625 |
ret = bs->media_changed; |
1626 |
bs->media_changed = 0;
|
1627 |
return ret;
|
1628 |
} |
1629 |
|
1630 |
/**
|
1631 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1632 |
*/
|
1633 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
1634 |
{ |
1635 |
BlockDriver *drv = bs->drv; |
1636 |
int ret;
|
1637 |
|
1638 |
if (!drv || !drv->bdrv_eject) {
|
1639 |
ret = -ENOTSUP; |
1640 |
} else {
|
1641 |
ret = drv->bdrv_eject(bs, eject_flag); |
1642 |
} |
1643 |
if (ret == -ENOTSUP) {
|
1644 |
if (eject_flag)
|
1645 |
bdrv_close(bs); |
1646 |
} |
1647 |
} |
1648 |
|
1649 |
int bdrv_is_locked(BlockDriverState *bs)
|
1650 |
{ |
1651 |
return bs->locked;
|
1652 |
} |
1653 |
|
1654 |
/**
|
1655 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1656 |
* to eject it manually).
|
1657 |
*/
|
1658 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1659 |
{ |
1660 |
BlockDriver *drv = bs->drv; |
1661 |
|
1662 |
bs->locked = locked; |
1663 |
if (drv && drv->bdrv_set_locked) {
|
1664 |
drv->bdrv_set_locked(bs, locked); |
1665 |
} |
1666 |
} |
1667 |
|
1668 |
/* needed for generic scsi interface */
|
1669 |
|
1670 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1671 |
{ |
1672 |
BlockDriver *drv = bs->drv; |
1673 |
|
1674 |
if (drv && drv->bdrv_ioctl)
|
1675 |
return drv->bdrv_ioctl(bs, req, buf);
|
1676 |
return -ENOTSUP;
|
1677 |
} |