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| 1 |
/*
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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 "qemu-common.h" |
| 25 |
#include "console.h" |
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#include "block_int.h" |
| 27 |
|
| 28 |
#ifdef _BSD
|
| 29 |
#include <sys/types.h> |
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#include <sys/stat.h> |
| 31 |
#include <sys/ioctl.h> |
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#include <sys/queue.h> |
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#include <sys/disk.h> |
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#endif
|
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|
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#define SECTOR_BITS 9 |
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#define SECTOR_SIZE (1 << SECTOR_BITS) |
| 38 |
|
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typedef struct BlockDriverAIOCBSync { |
| 40 |
BlockDriverAIOCB common; |
| 41 |
QEMUBH *bh; |
| 42 |
int ret;
|
| 43 |
} BlockDriverAIOCBSync; |
| 44 |
|
| 45 |
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, |
| 50 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 51 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
| 52 |
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); |
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|
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BlockDriverState *bdrv_first; |
| 58 |
|
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static BlockDriver *first_drv;
|
| 60 |
|
| 61 |
int path_is_absolute(const char *path) |
| 62 |
{
|
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const char *p; |
| 64 |
#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; |
| 68 |
#endif
|
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p = strchr(path, ':');
|
| 70 |
if (p)
|
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p++; |
| 72 |
else
|
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p = path; |
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#ifdef _WIN32
|
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return (*p == '/' || *p == '\\'); |
| 76 |
#else
|
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return (*p == '/'); |
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#endif
|
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} |
| 80 |
|
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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++; |
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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; |
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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); |
| 122 |
} |
| 123 |
} |
| 124 |
|
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|
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static void bdrv_register(BlockDriver *bdrv) |
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{
|
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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; |
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bdrv->bdrv_aio_write = bdrv_aio_write_em; |
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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) { |
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/* add synchronous IO emulation layer */
|
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bdrv->bdrv_read = bdrv_read_em; |
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bdrv->bdrv_write = bdrv_write_em; |
| 138 |
} |
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bdrv->next = first_drv; |
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first_drv = bdrv; |
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} |
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|
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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; |
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|
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bs = qemu_mallocz(sizeof(BlockDriverState));
|
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if(!bs)
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return NULL; |
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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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/* insert at the end */
|
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pbs = &bdrv_first; |
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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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} |
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|
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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) { |
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if (!strcmp(drv1->format_name, format_name))
|
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return drv1;
|
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} |
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return NULL; |
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} |
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|
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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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} |
| 180 |
|
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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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|
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GetTempPath(MAX_PATH, temp_dir); |
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GetTempFileName(temp_dir, "qem", 0, filename); |
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} |
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#else
|
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void get_tmp_filename(char *filename, int size) |
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{
|
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int fd;
|
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const char *tmpdir; |
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/* XXX: race condition possible */
|
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tmpdir = getenv("TMPDIR");
|
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if (!tmpdir)
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tmpdir = "/tmp";
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snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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fd = mkstemp(filename); |
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close(fd); |
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} |
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#endif
|
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|
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#ifdef _WIN32
|
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static int is_windows_drive_prefix(const char *filename) |
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{
|
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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] == ':'); |
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} |
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|
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static int is_windows_drive(const char *filename) |
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{
|
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if (is_windows_drive_prefix(filename) &&
|
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filename[2] == '\0') |
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return 1; |
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if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
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return 1; |
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return 0; |
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} |
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#endif
|
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|
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static BlockDriver *find_protocol(const char *filename) |
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{
|
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BlockDriver *drv1; |
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char protocol[128]; |
| 228 |
int len;
|
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const char *p; |
| 230 |
|
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#ifdef _WIN32
|
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if (is_windows_drive(filename) ||
|
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is_windows_drive_prefix(filename)) |
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return &bdrv_raw;
|
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#endif
|
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p = strchr(filename, ':');
|
| 237 |
if (!p)
|
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return &bdrv_raw;
|
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len = p - filename; |
| 240 |
if (len > sizeof(protocol) - 1) |
| 241 |
len = sizeof(protocol) - 1; |
| 242 |
memcpy(protocol, filename, len); |
| 243 |
protocol[len] = '\0';
|
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 245 |
if (drv1->protocol_name &&
|
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!strcmp(drv1->protocol_name, protocol)) |
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return drv1;
|
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} |
| 249 |
return NULL; |
| 250 |
} |
| 251 |
|
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/* XXX: force raw format if block or character device ? It would
|
| 253 |
simplify the BSD case */
|
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static BlockDriver *find_image_format(const char *filename) |
| 255 |
{
|
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int ret, score, score_max;
|
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BlockDriver *drv1, *drv; |
| 258 |
uint8_t buf[2048];
|
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BlockDriverState *bs; |
| 260 |
|
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/* detect host devices. By convention, /dev/cdrom[N] is always
|
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recognized as a host CDROM */
|
| 263 |
if (strstart(filename, "/dev/cdrom", NULL)) |
| 264 |
return &bdrv_host_device;
|
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#ifdef _WIN32
|
| 266 |
if (is_windows_drive(filename))
|
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return &bdrv_host_device;
|
| 268 |
#else
|
| 269 |
{
|
| 270 |
struct stat st;
|
| 271 |
if (stat(filename, &st) >= 0 && |
| 272 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
|
| 273 |
return &bdrv_host_device;
|
| 274 |
} |
| 275 |
} |
| 276 |
#endif
|
| 277 |
|
| 278 |
drv = find_protocol(filename); |
| 279 |
/* no need to test disk image formats for vvfat */
|
| 280 |
if (drv == &bdrv_vvfat)
|
| 281 |
return drv;
|
| 282 |
|
| 283 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
| 284 |
if (ret < 0) |
| 285 |
return NULL; |
| 286 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 287 |
bdrv_delete(bs); |
| 288 |
if (ret < 0) { |
| 289 |
return NULL; |
| 290 |
} |
| 291 |
|
| 292 |
score_max = 0;
|
| 293 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 294 |
if (drv1->bdrv_probe) {
|
| 295 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 296 |
if (score > score_max) {
|
| 297 |
score_max = score; |
| 298 |
drv = drv1; |
| 299 |
} |
| 300 |
} |
| 301 |
} |
| 302 |
return drv;
|
| 303 |
} |
| 304 |
|
| 305 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 306 |
{
|
| 307 |
BlockDriverState *bs; |
| 308 |
int ret;
|
| 309 |
|
| 310 |
bs = bdrv_new("");
|
| 311 |
if (!bs)
|
| 312 |
return -ENOMEM;
|
| 313 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
| 314 |
if (ret < 0) { |
| 315 |
bdrv_delete(bs); |
| 316 |
return ret;
|
| 317 |
} |
| 318 |
*pbs = bs; |
| 319 |
return 0; |
| 320 |
} |
| 321 |
|
| 322 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
| 323 |
{
|
| 324 |
return bdrv_open2(bs, filename, flags, NULL); |
| 325 |
} |
| 326 |
|
| 327 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
| 328 |
BlockDriver *drv) |
| 329 |
{
|
| 330 |
int ret, open_flags;
|
| 331 |
char tmp_filename[PATH_MAX];
|
| 332 |
char backing_filename[PATH_MAX];
|
| 333 |
|
| 334 |
bs->read_only = 0;
|
| 335 |
bs->is_temporary = 0;
|
| 336 |
bs->encrypted = 0;
|
| 337 |
|
| 338 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 339 |
BlockDriverState *bs1; |
| 340 |
int64_t total_size; |
| 341 |
int is_protocol = 0; |
| 342 |
|
| 343 |
/* if snapshot, we create a temporary backing file and open it
|
| 344 |
instead of opening 'filename' directly */
|
| 345 |
|
| 346 |
/* if there is a backing file, use it */
|
| 347 |
bs1 = bdrv_new("");
|
| 348 |
if (!bs1) {
|
| 349 |
return -ENOMEM;
|
| 350 |
} |
| 351 |
if (bdrv_open(bs1, filename, 0) < 0) { |
| 352 |
bdrv_delete(bs1); |
| 353 |
return -1; |
| 354 |
} |
| 355 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
| 356 |
|
| 357 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 358 |
is_protocol = 1;
|
| 359 |
|
| 360 |
bdrv_delete(bs1); |
| 361 |
|
| 362 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 363 |
|
| 364 |
/* Real path is meaningless for protocols */
|
| 365 |
if (is_protocol)
|
| 366 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 367 |
"%s", filename);
|
| 368 |
else
|
| 369 |
realpath(filename, backing_filename); |
| 370 |
|
| 371 |
if (bdrv_create(&bdrv_qcow2, tmp_filename,
|
| 372 |
total_size, backing_filename, 0) < 0) { |
| 373 |
return -1; |
| 374 |
} |
| 375 |
filename = tmp_filename; |
| 376 |
bs->is_temporary = 1;
|
| 377 |
} |
| 378 |
|
| 379 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 380 |
if (flags & BDRV_O_FILE) {
|
| 381 |
drv = find_protocol(filename); |
| 382 |
if (!drv)
|
| 383 |
return -ENOENT;
|
| 384 |
} else {
|
| 385 |
if (!drv) {
|
| 386 |
drv = find_image_format(filename); |
| 387 |
if (!drv)
|
| 388 |
return -1; |
| 389 |
} |
| 390 |
} |
| 391 |
bs->drv = drv; |
| 392 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 393 |
if (bs->opaque == NULL && drv->instance_size > 0) |
| 394 |
return -1; |
| 395 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
| 396 |
RDONLY as fallback */
|
| 397 |
if (!(flags & BDRV_O_FILE))
|
| 398 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT); |
| 399 |
else
|
| 400 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
| 401 |
ret = drv->bdrv_open(bs, filename, open_flags); |
| 402 |
if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
|
| 403 |
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
| 404 |
bs->read_only = 1;
|
| 405 |
} |
| 406 |
if (ret < 0) { |
| 407 |
qemu_free(bs->opaque); |
| 408 |
bs->opaque = NULL;
|
| 409 |
bs->drv = NULL;
|
| 410 |
return ret;
|
| 411 |
} |
| 412 |
if (drv->bdrv_getlength) {
|
| 413 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 414 |
} |
| 415 |
#ifndef _WIN32
|
| 416 |
if (bs->is_temporary) {
|
| 417 |
unlink(filename); |
| 418 |
} |
| 419 |
#endif
|
| 420 |
if (bs->backing_file[0] != '\0') { |
| 421 |
/* if there is a backing file, use it */
|
| 422 |
bs->backing_hd = bdrv_new("");
|
| 423 |
if (!bs->backing_hd) {
|
| 424 |
fail:
|
| 425 |
bdrv_close(bs); |
| 426 |
return -ENOMEM;
|
| 427 |
} |
| 428 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 429 |
filename, bs->backing_file); |
| 430 |
if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
| 431 |
goto fail;
|
| 432 |
} |
| 433 |
|
| 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 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 522 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 523 |
uint8_t *buf, int nb_sectors)
|
| 524 |
{
|
| 525 |
BlockDriver *drv = bs->drv; |
| 526 |
|
| 527 |
if (!drv)
|
| 528 |
return -ENOMEDIUM;
|
| 529 |
|
| 530 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 531 |
memcpy(buf, bs->boot_sector_data, 512);
|
| 532 |
sector_num++; |
| 533 |
nb_sectors--; |
| 534 |
buf += 512;
|
| 535 |
if (nb_sectors == 0) |
| 536 |
return 0; |
| 537 |
} |
| 538 |
if (drv->bdrv_pread) {
|
| 539 |
int ret, len;
|
| 540 |
len = nb_sectors * 512;
|
| 541 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
| 542 |
if (ret < 0) |
| 543 |
return ret;
|
| 544 |
else if (ret != len) |
| 545 |
return -EINVAL;
|
| 546 |
else {
|
| 547 |
bs->rd_bytes += (unsigned) len;
|
| 548 |
bs->rd_ops ++; |
| 549 |
return 0; |
| 550 |
} |
| 551 |
} else {
|
| 552 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
| 553 |
} |
| 554 |
} |
| 555 |
|
| 556 |
/* Return < 0 if error. Important errors are:
|
| 557 |
-EIO generic I/O error (may happen for all errors)
|
| 558 |
-ENOMEDIUM No media inserted.
|
| 559 |
-EINVAL Invalid sector number or nb_sectors
|
| 560 |
-EACCES Trying to write a read-only device
|
| 561 |
*/
|
| 562 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 563 |
const uint8_t *buf, int nb_sectors) |
| 564 |
{
|
| 565 |
BlockDriver *drv = bs->drv; |
| 566 |
if (!bs->drv)
|
| 567 |
return -ENOMEDIUM;
|
| 568 |
if (bs->read_only)
|
| 569 |
return -EACCES;
|
| 570 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 571 |
memcpy(bs->boot_sector_data, buf, 512);
|
| 572 |
} |
| 573 |
if (drv->bdrv_pwrite) {
|
| 574 |
int ret, len;
|
| 575 |
len = nb_sectors * 512;
|
| 576 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
|
| 577 |
if (ret < 0) |
| 578 |
return ret;
|
| 579 |
else if (ret != len) |
| 580 |
return -EIO;
|
| 581 |
else {
|
| 582 |
bs->wr_bytes += (unsigned) len;
|
| 583 |
bs->wr_ops ++; |
| 584 |
return 0; |
| 585 |
} |
| 586 |
} else {
|
| 587 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
| 588 |
} |
| 589 |
} |
| 590 |
|
| 591 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
| 592 |
uint8_t *buf, int count1)
|
| 593 |
{
|
| 594 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 595 |
int len, nb_sectors, count;
|
| 596 |
int64_t sector_num; |
| 597 |
|
| 598 |
count = count1; |
| 599 |
/* first read to align to sector start */
|
| 600 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 601 |
if (len > count)
|
| 602 |
len = count; |
| 603 |
sector_num = offset >> SECTOR_BITS; |
| 604 |
if (len > 0) { |
| 605 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 606 |
return -EIO;
|
| 607 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
| 608 |
count -= len; |
| 609 |
if (count == 0) |
| 610 |
return count1;
|
| 611 |
sector_num++; |
| 612 |
buf += len; |
| 613 |
} |
| 614 |
|
| 615 |
/* read the sectors "in place" */
|
| 616 |
nb_sectors = count >> SECTOR_BITS; |
| 617 |
if (nb_sectors > 0) { |
| 618 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
| 619 |
return -EIO;
|
| 620 |
sector_num += nb_sectors; |
| 621 |
len = nb_sectors << SECTOR_BITS; |
| 622 |
buf += len; |
| 623 |
count -= len; |
| 624 |
} |
| 625 |
|
| 626 |
/* add data from the last sector */
|
| 627 |
if (count > 0) { |
| 628 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 629 |
return -EIO;
|
| 630 |
memcpy(buf, tmp_buf, count); |
| 631 |
} |
| 632 |
return count1;
|
| 633 |
} |
| 634 |
|
| 635 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
| 636 |
const uint8_t *buf, int count1) |
| 637 |
{
|
| 638 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 639 |
int len, nb_sectors, count;
|
| 640 |
int64_t sector_num; |
| 641 |
|
| 642 |
count = count1; |
| 643 |
/* first write to align to sector start */
|
| 644 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 645 |
if (len > count)
|
| 646 |
len = count; |
| 647 |
sector_num = offset >> SECTOR_BITS; |
| 648 |
if (len > 0) { |
| 649 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 650 |
return -EIO;
|
| 651 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
| 652 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 653 |
return -EIO;
|
| 654 |
count -= len; |
| 655 |
if (count == 0) |
| 656 |
return count1;
|
| 657 |
sector_num++; |
| 658 |
buf += len; |
| 659 |
} |
| 660 |
|
| 661 |
/* write the sectors "in place" */
|
| 662 |
nb_sectors = count >> SECTOR_BITS; |
| 663 |
if (nb_sectors > 0) { |
| 664 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
| 665 |
return -EIO;
|
| 666 |
sector_num += nb_sectors; |
| 667 |
len = nb_sectors << SECTOR_BITS; |
| 668 |
buf += len; |
| 669 |
count -= len; |
| 670 |
} |
| 671 |
|
| 672 |
/* add data from the last sector */
|
| 673 |
if (count > 0) { |
| 674 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 675 |
return -EIO;
|
| 676 |
memcpy(tmp_buf, buf, count); |
| 677 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 678 |
return -EIO;
|
| 679 |
} |
| 680 |
return count1;
|
| 681 |
} |
| 682 |
|
| 683 |
/**
|
| 684 |
* Read with byte offsets (needed only for file protocols)
|
| 685 |
*/
|
| 686 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 687 |
void *buf1, int count1) |
| 688 |
{
|
| 689 |
BlockDriver *drv = bs->drv; |
| 690 |
|
| 691 |
if (!drv)
|
| 692 |
return -ENOMEDIUM;
|
| 693 |
if (!drv->bdrv_pread)
|
| 694 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
| 695 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
| 696 |
} |
| 697 |
|
| 698 |
/**
|
| 699 |
* Write with byte offsets (needed only for file protocols)
|
| 700 |
*/
|
| 701 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 702 |
const void *buf1, int count1) |
| 703 |
{
|
| 704 |
BlockDriver *drv = bs->drv; |
| 705 |
|
| 706 |
if (!drv)
|
| 707 |
return -ENOMEDIUM;
|
| 708 |
if (!drv->bdrv_pwrite)
|
| 709 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
| 710 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
| 711 |
} |
| 712 |
|
| 713 |
/**
|
| 714 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 715 |
*/
|
| 716 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 717 |
{
|
| 718 |
BlockDriver *drv = bs->drv; |
| 719 |
if (!drv)
|
| 720 |
return -ENOMEDIUM;
|
| 721 |
if (!drv->bdrv_truncate)
|
| 722 |
return -ENOTSUP;
|
| 723 |
return drv->bdrv_truncate(bs, offset);
|
| 724 |
} |
| 725 |
|
| 726 |
/**
|
| 727 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 728 |
*/
|
| 729 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 730 |
{
|
| 731 |
BlockDriver *drv = bs->drv; |
| 732 |
if (!drv)
|
| 733 |
return -ENOMEDIUM;
|
| 734 |
if (!drv->bdrv_getlength) {
|
| 735 |
/* legacy mode */
|
| 736 |
return bs->total_sectors * SECTOR_SIZE;
|
| 737 |
} |
| 738 |
return drv->bdrv_getlength(bs);
|
| 739 |
} |
| 740 |
|
| 741 |
/* return 0 as number of sectors if no device present or error */
|
| 742 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 743 |
{
|
| 744 |
int64_t length; |
| 745 |
length = bdrv_getlength(bs); |
| 746 |
if (length < 0) |
| 747 |
length = 0;
|
| 748 |
else
|
| 749 |
length = length >> SECTOR_BITS; |
| 750 |
*nb_sectors_ptr = length; |
| 751 |
} |
| 752 |
|
| 753 |
/* force a given boot sector. */
|
| 754 |
void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) |
| 755 |
{
|
| 756 |
bs->boot_sector_enabled = 1;
|
| 757 |
if (size > 512) |
| 758 |
size = 512;
|
| 759 |
memcpy(bs->boot_sector_data, data, size); |
| 760 |
memset(bs->boot_sector_data + size, 0, 512 - size); |
| 761 |
} |
| 762 |
|
| 763 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 764 |
int cyls, int heads, int secs) |
| 765 |
{
|
| 766 |
bs->cyls = cyls; |
| 767 |
bs->heads = heads; |
| 768 |
bs->secs = secs; |
| 769 |
} |
| 770 |
|
| 771 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 772 |
{
|
| 773 |
bs->type = type; |
| 774 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
| 775 |
type == BDRV_TYPE_FLOPPY)); |
| 776 |
} |
| 777 |
|
| 778 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 779 |
{
|
| 780 |
bs->translation = translation; |
| 781 |
} |
| 782 |
|
| 783 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 784 |
int *pcyls, int *pheads, int *psecs) |
| 785 |
{
|
| 786 |
*pcyls = bs->cyls; |
| 787 |
*pheads = bs->heads; |
| 788 |
*psecs = bs->secs; |
| 789 |
} |
| 790 |
|
| 791 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
| 792 |
{
|
| 793 |
return bs->type;
|
| 794 |
} |
| 795 |
|
| 796 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 797 |
{
|
| 798 |
return bs->translation;
|
| 799 |
} |
| 800 |
|
| 801 |
int bdrv_is_removable(BlockDriverState *bs)
|
| 802 |
{
|
| 803 |
return bs->removable;
|
| 804 |
} |
| 805 |
|
| 806 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 807 |
{
|
| 808 |
return bs->read_only;
|
| 809 |
} |
| 810 |
|
| 811 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 812 |
{
|
| 813 |
return bs->sg;
|
| 814 |
} |
| 815 |
|
| 816 |
/* XXX: no longer used */
|
| 817 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
| 818 |
void (*change_cb)(void *opaque), void *opaque) |
| 819 |
{
|
| 820 |
bs->change_cb = change_cb; |
| 821 |
bs->change_opaque = opaque; |
| 822 |
} |
| 823 |
|
| 824 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 825 |
{
|
| 826 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 827 |
return 1; |
| 828 |
return bs->encrypted;
|
| 829 |
} |
| 830 |
|
| 831 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 832 |
{
|
| 833 |
int ret;
|
| 834 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 835 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 836 |
if (ret < 0) |
| 837 |
return ret;
|
| 838 |
if (!bs->encrypted)
|
| 839 |
return 0; |
| 840 |
} |
| 841 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
| 842 |
return -1; |
| 843 |
return bs->drv->bdrv_set_key(bs, key);
|
| 844 |
} |
| 845 |
|
| 846 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 847 |
{
|
| 848 |
if (!bs->drv) {
|
| 849 |
buf[0] = '\0'; |
| 850 |
} else {
|
| 851 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 852 |
} |
| 853 |
} |
| 854 |
|
| 855 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 856 |
void *opaque)
|
| 857 |
{
|
| 858 |
BlockDriver *drv; |
| 859 |
|
| 860 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
| 861 |
it(opaque, drv->format_name); |
| 862 |
} |
| 863 |
} |
| 864 |
|
| 865 |
BlockDriverState *bdrv_find(const char *name) |
| 866 |
{
|
| 867 |
BlockDriverState *bs; |
| 868 |
|
| 869 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 870 |
if (!strcmp(name, bs->device_name))
|
| 871 |
return bs;
|
| 872 |
} |
| 873 |
return NULL; |
| 874 |
} |
| 875 |
|
| 876 |
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
| 877 |
{
|
| 878 |
BlockDriverState *bs; |
| 879 |
|
| 880 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 881 |
it(opaque, bs->device_name); |
| 882 |
} |
| 883 |
} |
| 884 |
|
| 885 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 886 |
{
|
| 887 |
return bs->device_name;
|
| 888 |
} |
| 889 |
|
| 890 |
void bdrv_flush(BlockDriverState *bs)
|
| 891 |
{
|
| 892 |
if (bs->drv->bdrv_flush)
|
| 893 |
bs->drv->bdrv_flush(bs); |
| 894 |
if (bs->backing_hd)
|
| 895 |
bdrv_flush(bs->backing_hd); |
| 896 |
} |
| 897 |
|
| 898 |
/*
|
| 899 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 900 |
* not implementing the functionality are assumed to not support backing files,
|
| 901 |
* hence all their sectors are reported as allocated.
|
| 902 |
*
|
| 903 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 904 |
* the specified sector) that are known to be in the same
|
| 905 |
* allocated/unallocated state.
|
| 906 |
*
|
| 907 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
| 908 |
*/
|
| 909 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 910 |
int *pnum)
|
| 911 |
{
|
| 912 |
int64_t n; |
| 913 |
if (!bs->drv->bdrv_is_allocated) {
|
| 914 |
if (sector_num >= bs->total_sectors) {
|
| 915 |
*pnum = 0;
|
| 916 |
return 0; |
| 917 |
} |
| 918 |
n = bs->total_sectors - sector_num; |
| 919 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 920 |
return 1; |
| 921 |
} |
| 922 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 923 |
} |
| 924 |
|
| 925 |
void bdrv_info(void) |
| 926 |
{
|
| 927 |
BlockDriverState *bs; |
| 928 |
|
| 929 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 930 |
term_printf("%s:", bs->device_name);
|
| 931 |
term_printf(" type=");
|
| 932 |
switch(bs->type) {
|
| 933 |
case BDRV_TYPE_HD:
|
| 934 |
term_printf("hd");
|
| 935 |
break;
|
| 936 |
case BDRV_TYPE_CDROM:
|
| 937 |
term_printf("cdrom");
|
| 938 |
break;
|
| 939 |
case BDRV_TYPE_FLOPPY:
|
| 940 |
term_printf("floppy");
|
| 941 |
break;
|
| 942 |
} |
| 943 |
term_printf(" removable=%d", bs->removable);
|
| 944 |
if (bs->removable) {
|
| 945 |
term_printf(" locked=%d", bs->locked);
|
| 946 |
} |
| 947 |
if (bs->drv) {
|
| 948 |
term_printf(" file=");
|
| 949 |
term_print_filename(bs->filename); |
| 950 |
if (bs->backing_file[0] != '\0') { |
| 951 |
term_printf(" backing_file=");
|
| 952 |
term_print_filename(bs->backing_file); |
| 953 |
} |
| 954 |
term_printf(" ro=%d", bs->read_only);
|
| 955 |
term_printf(" drv=%s", bs->drv->format_name);
|
| 956 |
if (bs->encrypted)
|
| 957 |
term_printf(" encrypted");
|
| 958 |
} else {
|
| 959 |
term_printf(" [not inserted]");
|
| 960 |
} |
| 961 |
term_printf("\n");
|
| 962 |
} |
| 963 |
} |
| 964 |
|
| 965 |
/* The "info blockstats" command. */
|
| 966 |
void bdrv_info_stats (void) |
| 967 |
{
|
| 968 |
BlockDriverState *bs; |
| 969 |
|
| 970 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 971 |
term_printf ("%s:"
|
| 972 |
" rd_bytes=%" PRIu64
|
| 973 |
" wr_bytes=%" PRIu64
|
| 974 |
" rd_operations=%" PRIu64
|
| 975 |
" wr_operations=%" PRIu64
|
| 976 |
"\n",
|
| 977 |
bs->device_name, |
| 978 |
bs->rd_bytes, bs->wr_bytes, |
| 979 |
bs->rd_ops, bs->wr_ops); |
| 980 |
} |
| 981 |
} |
| 982 |
|
| 983 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 984 |
char *filename, int filename_size) |
| 985 |
{
|
| 986 |
if (!bs->backing_hd) {
|
| 987 |
pstrcpy(filename, filename_size, "");
|
| 988 |
} else {
|
| 989 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 990 |
} |
| 991 |
} |
| 992 |
|
| 993 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 994 |
const uint8_t *buf, int nb_sectors) |
| 995 |
{
|
| 996 |
BlockDriver *drv = bs->drv; |
| 997 |
if (!drv)
|
| 998 |
return -ENOMEDIUM;
|
| 999 |
if (!drv->bdrv_write_compressed)
|
| 1000 |
return -ENOTSUP;
|
| 1001 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 1002 |
} |
| 1003 |
|
| 1004 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 1005 |
{
|
| 1006 |
BlockDriver *drv = bs->drv; |
| 1007 |
if (!drv)
|
| 1008 |
return -ENOMEDIUM;
|
| 1009 |
if (!drv->bdrv_get_info)
|
| 1010 |
return -ENOTSUP;
|
| 1011 |
memset(bdi, 0, sizeof(*bdi)); |
| 1012 |
return drv->bdrv_get_info(bs, bdi);
|
| 1013 |
} |
| 1014 |
|
| 1015 |
/**************************************************************/
|
| 1016 |
/* handling of snapshots */
|
| 1017 |
|
| 1018 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 1019 |
QEMUSnapshotInfo *sn_info) |
| 1020 |
{
|
| 1021 |
BlockDriver *drv = bs->drv; |
| 1022 |
if (!drv)
|
| 1023 |
return -ENOMEDIUM;
|
| 1024 |
if (!drv->bdrv_snapshot_create)
|
| 1025 |
return -ENOTSUP;
|
| 1026 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 1027 |
} |
| 1028 |
|
| 1029 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 1030 |
const char *snapshot_id) |
| 1031 |
{
|
| 1032 |
BlockDriver *drv = bs->drv; |
| 1033 |
if (!drv)
|
| 1034 |
return -ENOMEDIUM;
|
| 1035 |
if (!drv->bdrv_snapshot_goto)
|
| 1036 |
return -ENOTSUP;
|
| 1037 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 1038 |
} |
| 1039 |
|
| 1040 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1041 |
{
|
| 1042 |
BlockDriver *drv = bs->drv; |
| 1043 |
if (!drv)
|
| 1044 |
return -ENOMEDIUM;
|
| 1045 |
if (!drv->bdrv_snapshot_delete)
|
| 1046 |
return -ENOTSUP;
|
| 1047 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 1048 |
} |
| 1049 |
|
| 1050 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 1051 |
QEMUSnapshotInfo **psn_info) |
| 1052 |
{
|
| 1053 |
BlockDriver *drv = bs->drv; |
| 1054 |
if (!drv)
|
| 1055 |
return -ENOMEDIUM;
|
| 1056 |
if (!drv->bdrv_snapshot_list)
|
| 1057 |
return -ENOTSUP;
|
| 1058 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 1059 |
} |
| 1060 |
|
| 1061 |
#define NB_SUFFIXES 4 |
| 1062 |
|
| 1063 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1064 |
{
|
| 1065 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1066 |
int64_t base; |
| 1067 |
int i;
|
| 1068 |
|
| 1069 |
if (size <= 999) { |
| 1070 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 1071 |
} else {
|
| 1072 |
base = 1024;
|
| 1073 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 1074 |
if (size < (10 * base)) { |
| 1075 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 1076 |
(double)size / base,
|
| 1077 |
suffixes[i]); |
| 1078 |
break;
|
| 1079 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1080 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1081 |
((size + (base >> 1)) / base),
|
| 1082 |
suffixes[i]); |
| 1083 |
break;
|
| 1084 |
} |
| 1085 |
base = base * 1024;
|
| 1086 |
} |
| 1087 |
} |
| 1088 |
return buf;
|
| 1089 |
} |
| 1090 |
|
| 1091 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1092 |
{
|
| 1093 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 1094 |
#ifdef _WIN32
|
| 1095 |
struct tm *ptm;
|
| 1096 |
#else
|
| 1097 |
struct tm tm;
|
| 1098 |
#endif
|
| 1099 |
time_t ti; |
| 1100 |
int64_t secs; |
| 1101 |
|
| 1102 |
if (!sn) {
|
| 1103 |
snprintf(buf, buf_size, |
| 1104 |
"%-10s%-20s%7s%20s%15s",
|
| 1105 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1106 |
} else {
|
| 1107 |
ti = sn->date_sec; |
| 1108 |
#ifdef _WIN32
|
| 1109 |
ptm = localtime(&ti); |
| 1110 |
strftime(date_buf, sizeof(date_buf),
|
| 1111 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 1112 |
#else
|
| 1113 |
localtime_r(&ti, &tm); |
| 1114 |
strftime(date_buf, sizeof(date_buf),
|
| 1115 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 1116 |
#endif
|
| 1117 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 1118 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 1119 |
"%02d:%02d:%02d.%03d",
|
| 1120 |
(int)(secs / 3600), |
| 1121 |
(int)((secs / 60) % 60), |
| 1122 |
(int)(secs % 60), |
| 1123 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1124 |
snprintf(buf, buf_size, |
| 1125 |
"%-10s%-20s%7s%20s%15s",
|
| 1126 |
sn->id_str, sn->name, |
| 1127 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 1128 |
date_buf, |
| 1129 |
clock_buf); |
| 1130 |
} |
| 1131 |
return buf;
|
| 1132 |
} |
| 1133 |
|
| 1134 |
|
| 1135 |
/**************************************************************/
|
| 1136 |
/* async I/Os */
|
| 1137 |
|
| 1138 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
| 1139 |
uint8_t *buf, int nb_sectors,
|
| 1140 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1141 |
{
|
| 1142 |
BlockDriver *drv = bs->drv; |
| 1143 |
BlockDriverAIOCB *ret; |
| 1144 |
|
| 1145 |
if (!drv)
|
| 1146 |
return NULL; |
| 1147 |
|
| 1148 |
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
|
| 1149 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 1150 |
memcpy(buf, bs->boot_sector_data, 512);
|
| 1151 |
sector_num++; |
| 1152 |
nb_sectors--; |
| 1153 |
buf += 512;
|
| 1154 |
} |
| 1155 |
|
| 1156 |
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1157 |
|
| 1158 |
if (ret) {
|
| 1159 |
/* Update stats even though technically transfer has not happened. */
|
| 1160 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1161 |
bs->rd_ops ++; |
| 1162 |
} |
| 1163 |
|
| 1164 |
return ret;
|
| 1165 |
} |
| 1166 |
|
| 1167 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
| 1168 |
const uint8_t *buf, int nb_sectors, |
| 1169 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1170 |
{
|
| 1171 |
BlockDriver *drv = bs->drv; |
| 1172 |
BlockDriverAIOCB *ret; |
| 1173 |
|
| 1174 |
if (!drv)
|
| 1175 |
return NULL; |
| 1176 |
if (bs->read_only)
|
| 1177 |
return NULL; |
| 1178 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 1179 |
memcpy(bs->boot_sector_data, buf, 512);
|
| 1180 |
} |
| 1181 |
|
| 1182 |
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1183 |
|
| 1184 |
if (ret) {
|
| 1185 |
/* Update stats even though technically transfer has not happened. */
|
| 1186 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1187 |
bs->wr_ops ++; |
| 1188 |
} |
| 1189 |
|
| 1190 |
return ret;
|
| 1191 |
} |
| 1192 |
|
| 1193 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 1194 |
{
|
| 1195 |
BlockDriver *drv = acb->bs->drv; |
| 1196 |
|
| 1197 |
drv->bdrv_aio_cancel(acb); |
| 1198 |
} |
| 1199 |
|
| 1200 |
|
| 1201 |
/**************************************************************/
|
| 1202 |
/* async block device emulation */
|
| 1203 |
|
| 1204 |
static void bdrv_aio_bh_cb(void *opaque) |
| 1205 |
{
|
| 1206 |
BlockDriverAIOCBSync *acb = opaque; |
| 1207 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 1208 |
qemu_aio_release(acb); |
| 1209 |
} |
| 1210 |
|
| 1211 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
| 1212 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
| 1213 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1214 |
{
|
| 1215 |
BlockDriverAIOCBSync *acb; |
| 1216 |
int ret;
|
| 1217 |
|
| 1218 |
acb = qemu_aio_get(bs, cb, opaque); |
| 1219 |
if (!acb->bh)
|
| 1220 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1221 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
| 1222 |
acb->ret = ret; |
| 1223 |
qemu_bh_schedule(acb->bh); |
| 1224 |
return &acb->common;
|
| 1225 |
} |
| 1226 |
|
| 1227 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
| 1228 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
| 1229 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1230 |
{
|
| 1231 |
BlockDriverAIOCBSync *acb; |
| 1232 |
int ret;
|
| 1233 |
|
| 1234 |
acb = qemu_aio_get(bs, cb, opaque); |
| 1235 |
if (!acb->bh)
|
| 1236 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1237 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
| 1238 |
acb->ret = ret; |
| 1239 |
qemu_bh_schedule(acb->bh); |
| 1240 |
return &acb->common;
|
| 1241 |
} |
| 1242 |
|
| 1243 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 1244 |
{
|
| 1245 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
| 1246 |
qemu_bh_cancel(acb->bh); |
| 1247 |
qemu_aio_release(acb); |
| 1248 |
} |
| 1249 |
|
| 1250 |
/**************************************************************/
|
| 1251 |
/* sync block device emulation */
|
| 1252 |
|
| 1253 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
| 1254 |
{
|
| 1255 |
*(int *)opaque = ret;
|
| 1256 |
} |
| 1257 |
|
| 1258 |
#define NOT_DONE 0x7fffffff |
| 1259 |
|
| 1260 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 1261 |
uint8_t *buf, int nb_sectors)
|
| 1262 |
{
|
| 1263 |
int async_ret;
|
| 1264 |
BlockDriverAIOCB *acb; |
| 1265 |
|
| 1266 |
async_ret = NOT_DONE; |
| 1267 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
| 1268 |
bdrv_rw_em_cb, &async_ret); |
| 1269 |
if (acb == NULL) |
| 1270 |
return -1; |
| 1271 |
|
| 1272 |
while (async_ret == NOT_DONE) {
|
| 1273 |
qemu_aio_wait(); |
| 1274 |
} |
| 1275 |
|
| 1276 |
return async_ret;
|
| 1277 |
} |
| 1278 |
|
| 1279 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 1280 |
const uint8_t *buf, int nb_sectors) |
| 1281 |
{
|
| 1282 |
int async_ret;
|
| 1283 |
BlockDriverAIOCB *acb; |
| 1284 |
|
| 1285 |
async_ret = NOT_DONE; |
| 1286 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
| 1287 |
bdrv_rw_em_cb, &async_ret); |
| 1288 |
if (acb == NULL) |
| 1289 |
return -1; |
| 1290 |
while (async_ret == NOT_DONE) {
|
| 1291 |
qemu_aio_wait(); |
| 1292 |
} |
| 1293 |
return async_ret;
|
| 1294 |
} |
| 1295 |
|
| 1296 |
void bdrv_init(void) |
| 1297 |
{
|
| 1298 |
bdrv_register(&bdrv_raw); |
| 1299 |
bdrv_register(&bdrv_host_device); |
| 1300 |
#ifndef _WIN32
|
| 1301 |
bdrv_register(&bdrv_cow); |
| 1302 |
#endif
|
| 1303 |
bdrv_register(&bdrv_qcow); |
| 1304 |
bdrv_register(&bdrv_vmdk); |
| 1305 |
bdrv_register(&bdrv_cloop); |
| 1306 |
bdrv_register(&bdrv_dmg); |
| 1307 |
bdrv_register(&bdrv_bochs); |
| 1308 |
bdrv_register(&bdrv_vpc); |
| 1309 |
bdrv_register(&bdrv_vvfat); |
| 1310 |
bdrv_register(&bdrv_qcow2); |
| 1311 |
bdrv_register(&bdrv_parallels); |
| 1312 |
bdrv_register(&bdrv_nbd); |
| 1313 |
} |
| 1314 |
|
| 1315 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
| 1316 |
void *opaque)
|
| 1317 |
{
|
| 1318 |
BlockDriver *drv; |
| 1319 |
BlockDriverAIOCB *acb; |
| 1320 |
|
| 1321 |
drv = bs->drv; |
| 1322 |
if (drv->free_aiocb) {
|
| 1323 |
acb = drv->free_aiocb; |
| 1324 |
drv->free_aiocb = acb->next; |
| 1325 |
} else {
|
| 1326 |
acb = qemu_mallocz(drv->aiocb_size); |
| 1327 |
if (!acb)
|
| 1328 |
return NULL; |
| 1329 |
} |
| 1330 |
acb->bs = bs; |
| 1331 |
acb->cb = cb; |
| 1332 |
acb->opaque = opaque; |
| 1333 |
return acb;
|
| 1334 |
} |
| 1335 |
|
| 1336 |
void qemu_aio_release(void *p) |
| 1337 |
{
|
| 1338 |
BlockDriverAIOCB *acb = p; |
| 1339 |
BlockDriver *drv = acb->bs->drv; |
| 1340 |
acb->next = drv->free_aiocb; |
| 1341 |
drv->free_aiocb = acb; |
| 1342 |
} |
| 1343 |
|
| 1344 |
/**************************************************************/
|
| 1345 |
/* removable device support */
|
| 1346 |
|
| 1347 |
/**
|
| 1348 |
* Return TRUE if the media is present
|
| 1349 |
*/
|
| 1350 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 1351 |
{
|
| 1352 |
BlockDriver *drv = bs->drv; |
| 1353 |
int ret;
|
| 1354 |
if (!drv)
|
| 1355 |
return 0; |
| 1356 |
if (!drv->bdrv_is_inserted)
|
| 1357 |
return 1; |
| 1358 |
ret = drv->bdrv_is_inserted(bs); |
| 1359 |
return ret;
|
| 1360 |
} |
| 1361 |
|
| 1362 |
/**
|
| 1363 |
* Return TRUE if the media changed since the last call to this
|
| 1364 |
* function. It is currently only used for floppy disks
|
| 1365 |
*/
|
| 1366 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 1367 |
{
|
| 1368 |
BlockDriver *drv = bs->drv; |
| 1369 |
int ret;
|
| 1370 |
|
| 1371 |
if (!drv || !drv->bdrv_media_changed)
|
| 1372 |
ret = -ENOTSUP; |
| 1373 |
else
|
| 1374 |
ret = drv->bdrv_media_changed(bs); |
| 1375 |
if (ret == -ENOTSUP)
|
| 1376 |
ret = bs->media_changed; |
| 1377 |
bs->media_changed = 0;
|
| 1378 |
return ret;
|
| 1379 |
} |
| 1380 |
|
| 1381 |
/**
|
| 1382 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 1383 |
*/
|
| 1384 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 1385 |
{
|
| 1386 |
BlockDriver *drv = bs->drv; |
| 1387 |
int ret;
|
| 1388 |
|
| 1389 |
if (!drv || !drv->bdrv_eject) {
|
| 1390 |
ret = -ENOTSUP; |
| 1391 |
} else {
|
| 1392 |
ret = drv->bdrv_eject(bs, eject_flag); |
| 1393 |
} |
| 1394 |
if (ret == -ENOTSUP) {
|
| 1395 |
if (eject_flag)
|
| 1396 |
bdrv_close(bs); |
| 1397 |
} |
| 1398 |
} |
| 1399 |
|
| 1400 |
int bdrv_is_locked(BlockDriverState *bs)
|
| 1401 |
{
|
| 1402 |
return bs->locked;
|
| 1403 |
} |
| 1404 |
|
| 1405 |
/**
|
| 1406 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 1407 |
* to eject it manually).
|
| 1408 |
*/
|
| 1409 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 1410 |
{
|
| 1411 |
BlockDriver *drv = bs->drv; |
| 1412 |
|
| 1413 |
bs->locked = locked; |
| 1414 |
if (drv && drv->bdrv_set_locked) {
|
| 1415 |
drv->bdrv_set_locked(bs, locked); |
| 1416 |
} |
| 1417 |
} |
| 1418 |
|
| 1419 |
/* needed for generic scsi interface */
|
| 1420 |
|
| 1421 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 1422 |
{
|
| 1423 |
BlockDriver *drv = bs->drv; |
| 1424 |
|
| 1425 |
if (drv && drv->bdrv_ioctl)
|
| 1426 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 1427 |
return -ENOTSUP;
|
| 1428 |
} |