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| 1 |
/*
|
|---|---|
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
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* of this software and associated documentation files (the "Software"), to deal
|
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h" |
| 25 |
#include "qemu-common.h" |
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#include "monitor.h" |
| 27 |
#include "block_int.h" |
| 28 |
#include "module.h" |
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|
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#ifdef CONFIG_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
| 33 |
#include <sys/ioctl.h> |
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#include <sys/queue.h> |
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#ifndef __DragonFly__
|
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#include <sys/disk.h> |
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#endif
|
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#endif
|
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|
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#ifdef _WIN32
|
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#include <windows.h> |
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#endif
|
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|
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#define SECTOR_BITS 9 |
| 45 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
| 46 |
|
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static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
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BlockDriverCompletionFunc *cb, void *opaque);
|
| 50 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
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BlockDriverCompletionFunc *cb, void *opaque);
|
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static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
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BlockDriverCompletionFunc *cb, void *opaque);
|
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 56 |
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); |
| 59 |
|
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BlockDriverState *bdrv_first; |
| 61 |
|
| 62 |
static BlockDriver *first_drv;
|
| 63 |
|
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int path_is_absolute(const char *path) |
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{
|
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const char *p; |
| 67 |
#ifdef _WIN32
|
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/* specific case for names like: "\\.\d:" */
|
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if (*path == '/' || *path == '\\') |
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return 1; |
| 71 |
#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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} |
| 83 |
|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
|
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path to it by considering it is relative to base_path. URL are
|
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supported. */
|
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{
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const char *p, *p1; |
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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); |
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} |
| 126 |
} |
| 127 |
|
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void bdrv_register(BlockDriver *bdrv)
|
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{
|
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if (!bdrv->bdrv_aio_readv) {
|
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/* add AIO emulation layer */
|
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
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bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
| 134 |
} else if (!bdrv->bdrv_read) { |
| 135 |
/* add synchronous IO emulation layer */
|
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bdrv->bdrv_read = bdrv_read_em; |
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bdrv->bdrv_write = bdrv_write_em; |
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} |
| 139 |
|
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if (!bdrv->bdrv_aio_flush)
|
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
| 142 |
|
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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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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, const char* filename, |
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QEMUOptionParameter *options) |
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{
|
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if (!drv->bdrv_create)
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return -ENOTSUP;
|
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|
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return drv->bdrv_create(filename, options);
|
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} |
| 182 |
|
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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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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]; |
| 230 |
int len;
|
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const char *p; |
| 232 |
|
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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_find_format("raw"); |
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#endif
|
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p = strchr(filename, ':');
|
| 239 |
if (!p)
|
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return bdrv_find_format("raw"); |
| 241 |
len = p - filename; |
| 242 |
if (len > sizeof(protocol) - 1) |
| 243 |
len = sizeof(protocol) - 1; |
| 244 |
memcpy(protocol, filename, len); |
| 245 |
protocol[len] = '\0';
|
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 247 |
if (drv1->protocol_name &&
|
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!strcmp(drv1->protocol_name, protocol)) |
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return drv1;
|
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} |
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return NULL; |
| 252 |
} |
| 253 |
|
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/*
|
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* Detect host devices. By convention, /dev/cdrom[N] is always
|
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* recognized as a host CDROM.
|
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*/
|
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static BlockDriver *find_hdev_driver(const char *filename) |
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{
|
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int score_max = 0, score; |
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BlockDriver *drv = NULL, *d;
|
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|
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for (d = first_drv; d; d = d->next) {
|
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if (d->bdrv_probe_device) {
|
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score = d->bdrv_probe_device(filename); |
| 266 |
if (score > score_max) {
|
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score_max = score; |
| 268 |
drv = d; |
| 269 |
} |
| 270 |
} |
| 271 |
} |
| 272 |
|
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return drv;
|
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} |
| 275 |
|
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static BlockDriver *find_image_format(const char *filename) |
| 277 |
{
|
| 278 |
int ret, score, score_max;
|
| 279 |
BlockDriver *drv1, *drv; |
| 280 |
uint8_t buf[2048];
|
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BlockDriverState *bs; |
| 282 |
|
| 283 |
drv = find_protocol(filename); |
| 284 |
/* no need to test disk image formats for vvfat */
|
| 285 |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
| 286 |
return drv;
|
| 287 |
|
| 288 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
| 289 |
if (ret < 0) |
| 290 |
return NULL; |
| 291 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 292 |
bdrv_delete(bs); |
| 293 |
if (ret < 0) { |
| 294 |
return NULL; |
| 295 |
} |
| 296 |
|
| 297 |
score_max = 0;
|
| 298 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 299 |
if (drv1->bdrv_probe) {
|
| 300 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 301 |
if (score > score_max) {
|
| 302 |
score_max = score; |
| 303 |
drv = drv1; |
| 304 |
} |
| 305 |
} |
| 306 |
} |
| 307 |
return drv;
|
| 308 |
} |
| 309 |
|
| 310 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 311 |
{
|
| 312 |
BlockDriverState *bs; |
| 313 |
int ret;
|
| 314 |
|
| 315 |
bs = bdrv_new("");
|
| 316 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
| 317 |
if (ret < 0) { |
| 318 |
bdrv_delete(bs); |
| 319 |
return ret;
|
| 320 |
} |
| 321 |
bs->growable = 1;
|
| 322 |
*pbs = bs; |
| 323 |
return 0; |
| 324 |
} |
| 325 |
|
| 326 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
| 327 |
{
|
| 328 |
return bdrv_open2(bs, filename, flags, NULL); |
| 329 |
} |
| 330 |
|
| 331 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
| 332 |
BlockDriver *drv) |
| 333 |
{
|
| 334 |
int ret, open_flags;
|
| 335 |
char tmp_filename[PATH_MAX];
|
| 336 |
char backing_filename[PATH_MAX];
|
| 337 |
|
| 338 |
bs->read_only = 0;
|
| 339 |
bs->is_temporary = 0;
|
| 340 |
bs->encrypted = 0;
|
| 341 |
bs->valid_key = 0;
|
| 342 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
| 343 |
bs->buffer_alignment = 512;
|
| 344 |
|
| 345 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 346 |
BlockDriverState *bs1; |
| 347 |
int64_t total_size; |
| 348 |
int is_protocol = 0; |
| 349 |
BlockDriver *bdrv_qcow2; |
| 350 |
QEMUOptionParameter *options; |
| 351 |
|
| 352 |
/* if snapshot, we create a temporary backing file and open it
|
| 353 |
instead of opening 'filename' directly */
|
| 354 |
|
| 355 |
/* if there is a backing file, use it */
|
| 356 |
bs1 = bdrv_new("");
|
| 357 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
| 358 |
if (ret < 0) { |
| 359 |
bdrv_delete(bs1); |
| 360 |
return ret;
|
| 361 |
} |
| 362 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
| 363 |
|
| 364 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 365 |
is_protocol = 1;
|
| 366 |
|
| 367 |
bdrv_delete(bs1); |
| 368 |
|
| 369 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 370 |
|
| 371 |
/* Real path is meaningless for protocols */
|
| 372 |
if (is_protocol)
|
| 373 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 374 |
"%s", filename);
|
| 375 |
else
|
| 376 |
realpath(filename, backing_filename); |
| 377 |
|
| 378 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
| 379 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
| 380 |
|
| 381 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
| 382 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
| 383 |
if (drv) {
|
| 384 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
| 385 |
drv->format_name); |
| 386 |
} |
| 387 |
|
| 388 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
| 389 |
if (ret < 0) { |
| 390 |
return ret;
|
| 391 |
} |
| 392 |
|
| 393 |
filename = tmp_filename; |
| 394 |
drv = bdrv_qcow2; |
| 395 |
bs->is_temporary = 1;
|
| 396 |
} |
| 397 |
|
| 398 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 399 |
if (flags & BDRV_O_FILE) {
|
| 400 |
drv = find_protocol(filename); |
| 401 |
} else if (!drv) { |
| 402 |
drv = find_hdev_driver(filename); |
| 403 |
if (!drv) {
|
| 404 |
drv = find_image_format(filename); |
| 405 |
} |
| 406 |
} |
| 407 |
if (!drv) {
|
| 408 |
ret = -ENOENT; |
| 409 |
goto unlink_and_fail;
|
| 410 |
} |
| 411 |
bs->drv = drv; |
| 412 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 413 |
|
| 414 |
/*
|
| 415 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
| 416 |
* write cache to the guest. We do need the fdatasync to flush
|
| 417 |
* out transactions for block allocations, and we maybe have a
|
| 418 |
* volatile write cache in our backing device to deal with.
|
| 419 |
*/
|
| 420 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
| 421 |
bs->enable_write_cache = 1;
|
| 422 |
|
| 423 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
| 424 |
RDONLY as fallback */
|
| 425 |
if (!(flags & BDRV_O_FILE))
|
| 426 |
open_flags = BDRV_O_RDWR | |
| 427 |
(flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
| 428 |
else
|
| 429 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
| 430 |
ret = drv->bdrv_open(bs, filename, open_flags); |
| 431 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
| 432 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
| 433 |
bs->read_only = 1;
|
| 434 |
} |
| 435 |
if (ret < 0) { |
| 436 |
qemu_free(bs->opaque); |
| 437 |
bs->opaque = NULL;
|
| 438 |
bs->drv = NULL;
|
| 439 |
unlink_and_fail:
|
| 440 |
if (bs->is_temporary)
|
| 441 |
unlink(filename); |
| 442 |
return ret;
|
| 443 |
} |
| 444 |
if (drv->bdrv_getlength) {
|
| 445 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 446 |
} |
| 447 |
#ifndef _WIN32
|
| 448 |
if (bs->is_temporary) {
|
| 449 |
unlink(filename); |
| 450 |
} |
| 451 |
#endif
|
| 452 |
if (bs->backing_file[0] != '\0') { |
| 453 |
/* if there is a backing file, use it */
|
| 454 |
BlockDriver *back_drv = NULL;
|
| 455 |
bs->backing_hd = bdrv_new("");
|
| 456 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 457 |
filename, bs->backing_file); |
| 458 |
if (bs->backing_format[0] != '\0') |
| 459 |
back_drv = bdrv_find_format(bs->backing_format); |
| 460 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
| 461 |
back_drv); |
| 462 |
if (ret < 0) { |
| 463 |
bdrv_close(bs); |
| 464 |
return ret;
|
| 465 |
} |
| 466 |
} |
| 467 |
|
| 468 |
if (!bdrv_key_required(bs)) {
|
| 469 |
/* call the change callback */
|
| 470 |
bs->media_changed = 1;
|
| 471 |
if (bs->change_cb)
|
| 472 |
bs->change_cb(bs->change_opaque); |
| 473 |
} |
| 474 |
return 0; |
| 475 |
} |
| 476 |
|
| 477 |
void bdrv_close(BlockDriverState *bs)
|
| 478 |
{
|
| 479 |
if (bs->drv) {
|
| 480 |
if (bs->backing_hd)
|
| 481 |
bdrv_delete(bs->backing_hd); |
| 482 |
bs->drv->bdrv_close(bs); |
| 483 |
qemu_free(bs->opaque); |
| 484 |
#ifdef _WIN32
|
| 485 |
if (bs->is_temporary) {
|
| 486 |
unlink(bs->filename); |
| 487 |
} |
| 488 |
#endif
|
| 489 |
bs->opaque = NULL;
|
| 490 |
bs->drv = NULL;
|
| 491 |
|
| 492 |
/* call the change callback */
|
| 493 |
bs->media_changed = 1;
|
| 494 |
if (bs->change_cb)
|
| 495 |
bs->change_cb(bs->change_opaque); |
| 496 |
} |
| 497 |
} |
| 498 |
|
| 499 |
void bdrv_delete(BlockDriverState *bs)
|
| 500 |
{
|
| 501 |
BlockDriverState **pbs; |
| 502 |
|
| 503 |
pbs = &bdrv_first; |
| 504 |
while (*pbs != bs && *pbs != NULL) |
| 505 |
pbs = &(*pbs)->next; |
| 506 |
if (*pbs == bs)
|
| 507 |
*pbs = bs->next; |
| 508 |
|
| 509 |
bdrv_close(bs); |
| 510 |
qemu_free(bs); |
| 511 |
} |
| 512 |
|
| 513 |
/*
|
| 514 |
* Run consistency checks on an image
|
| 515 |
*
|
| 516 |
* Returns the number of errors or -errno when an internal error occurs
|
| 517 |
*/
|
| 518 |
int bdrv_check(BlockDriverState *bs)
|
| 519 |
{
|
| 520 |
if (bs->drv->bdrv_check == NULL) { |
| 521 |
return -ENOTSUP;
|
| 522 |
} |
| 523 |
|
| 524 |
return bs->drv->bdrv_check(bs);
|
| 525 |
} |
| 526 |
|
| 527 |
/* commit COW file into the raw image */
|
| 528 |
int bdrv_commit(BlockDriverState *bs)
|
| 529 |
{
|
| 530 |
BlockDriver *drv = bs->drv; |
| 531 |
int64_t i, total_sectors; |
| 532 |
int n, j;
|
| 533 |
unsigned char sector[512]; |
| 534 |
|
| 535 |
if (!drv)
|
| 536 |
return -ENOMEDIUM;
|
| 537 |
|
| 538 |
if (bs->read_only) {
|
| 539 |
return -EACCES;
|
| 540 |
} |
| 541 |
|
| 542 |
if (!bs->backing_hd) {
|
| 543 |
return -ENOTSUP;
|
| 544 |
} |
| 545 |
|
| 546 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 547 |
for (i = 0; i < total_sectors;) { |
| 548 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
| 549 |
for(j = 0; j < n; j++) { |
| 550 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
| 551 |
return -EIO;
|
| 552 |
} |
| 553 |
|
| 554 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
| 555 |
return -EIO;
|
| 556 |
} |
| 557 |
i++; |
| 558 |
} |
| 559 |
} else {
|
| 560 |
i += n; |
| 561 |
} |
| 562 |
} |
| 563 |
|
| 564 |
if (drv->bdrv_make_empty)
|
| 565 |
return drv->bdrv_make_empty(bs);
|
| 566 |
|
| 567 |
return 0; |
| 568 |
} |
| 569 |
|
| 570 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 571 |
size_t size) |
| 572 |
{
|
| 573 |
int64_t len; |
| 574 |
|
| 575 |
if (!bdrv_is_inserted(bs))
|
| 576 |
return -ENOMEDIUM;
|
| 577 |
|
| 578 |
if (bs->growable)
|
| 579 |
return 0; |
| 580 |
|
| 581 |
len = bdrv_getlength(bs); |
| 582 |
|
| 583 |
if (offset < 0) |
| 584 |
return -EIO;
|
| 585 |
|
| 586 |
if ((offset > len) || (len - offset < size))
|
| 587 |
return -EIO;
|
| 588 |
|
| 589 |
return 0; |
| 590 |
} |
| 591 |
|
| 592 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 593 |
int nb_sectors)
|
| 594 |
{
|
| 595 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
| 596 |
} |
| 597 |
|
| 598 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 599 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 600 |
uint8_t *buf, int nb_sectors)
|
| 601 |
{
|
| 602 |
BlockDriver *drv = bs->drv; |
| 603 |
|
| 604 |
if (!drv)
|
| 605 |
return -ENOMEDIUM;
|
| 606 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 607 |
return -EIO;
|
| 608 |
|
| 609 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
| 610 |
} |
| 611 |
|
| 612 |
/* Return < 0 if error. Important errors are:
|
| 613 |
-EIO generic I/O error (may happen for all errors)
|
| 614 |
-ENOMEDIUM No media inserted.
|
| 615 |
-EINVAL Invalid sector number or nb_sectors
|
| 616 |
-EACCES Trying to write a read-only device
|
| 617 |
*/
|
| 618 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 619 |
const uint8_t *buf, int nb_sectors) |
| 620 |
{
|
| 621 |
BlockDriver *drv = bs->drv; |
| 622 |
if (!bs->drv)
|
| 623 |
return -ENOMEDIUM;
|
| 624 |
if (bs->read_only)
|
| 625 |
return -EACCES;
|
| 626 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 627 |
return -EIO;
|
| 628 |
|
| 629 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
| 630 |
} |
| 631 |
|
| 632 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 633 |
void *buf, int count1) |
| 634 |
{
|
| 635 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 636 |
int len, nb_sectors, count;
|
| 637 |
int64_t sector_num; |
| 638 |
|
| 639 |
count = count1; |
| 640 |
/* first read to align to sector start */
|
| 641 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 642 |
if (len > count)
|
| 643 |
len = count; |
| 644 |
sector_num = offset >> SECTOR_BITS; |
| 645 |
if (len > 0) { |
| 646 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 647 |
return -EIO;
|
| 648 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
| 649 |
count -= len; |
| 650 |
if (count == 0) |
| 651 |
return count1;
|
| 652 |
sector_num++; |
| 653 |
buf += len; |
| 654 |
} |
| 655 |
|
| 656 |
/* read the sectors "in place" */
|
| 657 |
nb_sectors = count >> SECTOR_BITS; |
| 658 |
if (nb_sectors > 0) { |
| 659 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
| 660 |
return -EIO;
|
| 661 |
sector_num += nb_sectors; |
| 662 |
len = nb_sectors << SECTOR_BITS; |
| 663 |
buf += len; |
| 664 |
count -= len; |
| 665 |
} |
| 666 |
|
| 667 |
/* add data from the last sector */
|
| 668 |
if (count > 0) { |
| 669 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 670 |
return -EIO;
|
| 671 |
memcpy(buf, tmp_buf, count); |
| 672 |
} |
| 673 |
return count1;
|
| 674 |
} |
| 675 |
|
| 676 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 677 |
const void *buf, int count1) |
| 678 |
{
|
| 679 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 680 |
int len, nb_sectors, count;
|
| 681 |
int64_t sector_num; |
| 682 |
|
| 683 |
count = count1; |
| 684 |
/* first write to align to sector start */
|
| 685 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 686 |
if (len > count)
|
| 687 |
len = count; |
| 688 |
sector_num = offset >> SECTOR_BITS; |
| 689 |
if (len > 0) { |
| 690 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 691 |
return -EIO;
|
| 692 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
| 693 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 694 |
return -EIO;
|
| 695 |
count -= len; |
| 696 |
if (count == 0) |
| 697 |
return count1;
|
| 698 |
sector_num++; |
| 699 |
buf += len; |
| 700 |
} |
| 701 |
|
| 702 |
/* write the sectors "in place" */
|
| 703 |
nb_sectors = count >> SECTOR_BITS; |
| 704 |
if (nb_sectors > 0) { |
| 705 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
| 706 |
return -EIO;
|
| 707 |
sector_num += nb_sectors; |
| 708 |
len = nb_sectors << SECTOR_BITS; |
| 709 |
buf += len; |
| 710 |
count -= len; |
| 711 |
} |
| 712 |
|
| 713 |
/* add data from the last sector */
|
| 714 |
if (count > 0) { |
| 715 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 716 |
return -EIO;
|
| 717 |
memcpy(tmp_buf, buf, count); |
| 718 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 719 |
return -EIO;
|
| 720 |
} |
| 721 |
return count1;
|
| 722 |
} |
| 723 |
|
| 724 |
/**
|
| 725 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 726 |
*/
|
| 727 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 728 |
{
|
| 729 |
BlockDriver *drv = bs->drv; |
| 730 |
if (!drv)
|
| 731 |
return -ENOMEDIUM;
|
| 732 |
if (!drv->bdrv_truncate)
|
| 733 |
return -ENOTSUP;
|
| 734 |
return drv->bdrv_truncate(bs, offset);
|
| 735 |
} |
| 736 |
|
| 737 |
/**
|
| 738 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 739 |
*/
|
| 740 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 741 |
{
|
| 742 |
BlockDriver *drv = bs->drv; |
| 743 |
if (!drv)
|
| 744 |
return -ENOMEDIUM;
|
| 745 |
if (!drv->bdrv_getlength) {
|
| 746 |
/* legacy mode */
|
| 747 |
return bs->total_sectors * SECTOR_SIZE;
|
| 748 |
} |
| 749 |
return drv->bdrv_getlength(bs);
|
| 750 |
} |
| 751 |
|
| 752 |
/* return 0 as number of sectors if no device present or error */
|
| 753 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 754 |
{
|
| 755 |
int64_t length; |
| 756 |
length = bdrv_getlength(bs); |
| 757 |
if (length < 0) |
| 758 |
length = 0;
|
| 759 |
else
|
| 760 |
length = length >> SECTOR_BITS; |
| 761 |
*nb_sectors_ptr = length; |
| 762 |
} |
| 763 |
|
| 764 |
struct partition {
|
| 765 |
uint8_t boot_ind; /* 0x80 - active */
|
| 766 |
uint8_t head; /* starting head */
|
| 767 |
uint8_t sector; /* starting sector */
|
| 768 |
uint8_t cyl; /* starting cylinder */
|
| 769 |
uint8_t sys_ind; /* What partition type */
|
| 770 |
uint8_t end_head; /* end head */
|
| 771 |
uint8_t end_sector; /* end sector */
|
| 772 |
uint8_t end_cyl; /* end cylinder */
|
| 773 |
uint32_t start_sect; /* starting sector counting from 0 */
|
| 774 |
uint32_t nr_sects; /* nr of sectors in partition */
|
| 775 |
} __attribute__((packed)); |
| 776 |
|
| 777 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
| 778 |
static int guess_disk_lchs(BlockDriverState *bs, |
| 779 |
int *pcylinders, int *pheads, int *psectors) |
| 780 |
{
|
| 781 |
uint8_t buf[512];
|
| 782 |
int ret, i, heads, sectors, cylinders;
|
| 783 |
struct partition *p;
|
| 784 |
uint32_t nr_sects; |
| 785 |
uint64_t nb_sectors; |
| 786 |
|
| 787 |
bdrv_get_geometry(bs, &nb_sectors); |
| 788 |
|
| 789 |
ret = bdrv_read(bs, 0, buf, 1); |
| 790 |
if (ret < 0) |
| 791 |
return -1; |
| 792 |
/* test msdos magic */
|
| 793 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 794 |
return -1; |
| 795 |
for(i = 0; i < 4; i++) { |
| 796 |
p = ((struct partition *)(buf + 0x1be)) + i; |
| 797 |
nr_sects = le32_to_cpu(p->nr_sects); |
| 798 |
if (nr_sects && p->end_head) {
|
| 799 |
/* We make the assumption that the partition terminates on
|
| 800 |
a cylinder boundary */
|
| 801 |
heads = p->end_head + 1;
|
| 802 |
sectors = p->end_sector & 63;
|
| 803 |
if (sectors == 0) |
| 804 |
continue;
|
| 805 |
cylinders = nb_sectors / (heads * sectors); |
| 806 |
if (cylinders < 1 || cylinders > 16383) |
| 807 |
continue;
|
| 808 |
*pheads = heads; |
| 809 |
*psectors = sectors; |
| 810 |
*pcylinders = cylinders; |
| 811 |
#if 0
|
| 812 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
| 813 |
cylinders, heads, sectors);
|
| 814 |
#endif
|
| 815 |
return 0; |
| 816 |
} |
| 817 |
} |
| 818 |
return -1; |
| 819 |
} |
| 820 |
|
| 821 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 822 |
{
|
| 823 |
int translation, lba_detected = 0; |
| 824 |
int cylinders, heads, secs;
|
| 825 |
uint64_t nb_sectors; |
| 826 |
|
| 827 |
/* if a geometry hint is available, use it */
|
| 828 |
bdrv_get_geometry(bs, &nb_sectors); |
| 829 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 830 |
translation = bdrv_get_translation_hint(bs); |
| 831 |
if (cylinders != 0) { |
| 832 |
*pcyls = cylinders; |
| 833 |
*pheads = heads; |
| 834 |
*psecs = secs; |
| 835 |
} else {
|
| 836 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 837 |
if (heads > 16) { |
| 838 |
/* if heads > 16, it means that a BIOS LBA
|
| 839 |
translation was active, so the default
|
| 840 |
hardware geometry is OK */
|
| 841 |
lba_detected = 1;
|
| 842 |
goto default_geometry;
|
| 843 |
} else {
|
| 844 |
*pcyls = cylinders; |
| 845 |
*pheads = heads; |
| 846 |
*psecs = secs; |
| 847 |
/* disable any translation to be in sync with
|
| 848 |
the logical geometry */
|
| 849 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
| 850 |
bdrv_set_translation_hint(bs, |
| 851 |
BIOS_ATA_TRANSLATION_NONE); |
| 852 |
} |
| 853 |
} |
| 854 |
} else {
|
| 855 |
default_geometry:
|
| 856 |
/* if no geometry, use a standard physical disk geometry */
|
| 857 |
cylinders = nb_sectors / (16 * 63); |
| 858 |
|
| 859 |
if (cylinders > 16383) |
| 860 |
cylinders = 16383;
|
| 861 |
else if (cylinders < 2) |
| 862 |
cylinders = 2;
|
| 863 |
*pcyls = cylinders; |
| 864 |
*pheads = 16;
|
| 865 |
*psecs = 63;
|
| 866 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 867 |
if ((*pcyls * *pheads) <= 131072) { |
| 868 |
bdrv_set_translation_hint(bs, |
| 869 |
BIOS_ATA_TRANSLATION_LARGE); |
| 870 |
} else {
|
| 871 |
bdrv_set_translation_hint(bs, |
| 872 |
BIOS_ATA_TRANSLATION_LBA); |
| 873 |
} |
| 874 |
} |
| 875 |
} |
| 876 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 877 |
} |
| 878 |
} |
| 879 |
|
| 880 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 881 |
int cyls, int heads, int secs) |
| 882 |
{
|
| 883 |
bs->cyls = cyls; |
| 884 |
bs->heads = heads; |
| 885 |
bs->secs = secs; |
| 886 |
} |
| 887 |
|
| 888 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 889 |
{
|
| 890 |
bs->type = type; |
| 891 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
| 892 |
type == BDRV_TYPE_FLOPPY)); |
| 893 |
} |
| 894 |
|
| 895 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 896 |
{
|
| 897 |
bs->translation = translation; |
| 898 |
} |
| 899 |
|
| 900 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 901 |
int *pcyls, int *pheads, int *psecs) |
| 902 |
{
|
| 903 |
*pcyls = bs->cyls; |
| 904 |
*pheads = bs->heads; |
| 905 |
*psecs = bs->secs; |
| 906 |
} |
| 907 |
|
| 908 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
| 909 |
{
|
| 910 |
return bs->type;
|
| 911 |
} |
| 912 |
|
| 913 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 914 |
{
|
| 915 |
return bs->translation;
|
| 916 |
} |
| 917 |
|
| 918 |
int bdrv_is_removable(BlockDriverState *bs)
|
| 919 |
{
|
| 920 |
return bs->removable;
|
| 921 |
} |
| 922 |
|
| 923 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 924 |
{
|
| 925 |
return bs->read_only;
|
| 926 |
} |
| 927 |
|
| 928 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 929 |
{
|
| 930 |
return bs->sg;
|
| 931 |
} |
| 932 |
|
| 933 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
| 934 |
{
|
| 935 |
return bs->enable_write_cache;
|
| 936 |
} |
| 937 |
|
| 938 |
/* XXX: no longer used */
|
| 939 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
| 940 |
void (*change_cb)(void *opaque), void *opaque) |
| 941 |
{
|
| 942 |
bs->change_cb = change_cb; |
| 943 |
bs->change_opaque = opaque; |
| 944 |
} |
| 945 |
|
| 946 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 947 |
{
|
| 948 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 949 |
return 1; |
| 950 |
return bs->encrypted;
|
| 951 |
} |
| 952 |
|
| 953 |
int bdrv_key_required(BlockDriverState *bs)
|
| 954 |
{
|
| 955 |
BlockDriverState *backing_hd = bs->backing_hd; |
| 956 |
|
| 957 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
| 958 |
return 1; |
| 959 |
return (bs->encrypted && !bs->valid_key);
|
| 960 |
} |
| 961 |
|
| 962 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 963 |
{
|
| 964 |
int ret;
|
| 965 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 966 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 967 |
if (ret < 0) |
| 968 |
return ret;
|
| 969 |
if (!bs->encrypted)
|
| 970 |
return 0; |
| 971 |
} |
| 972 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
| 973 |
return -1; |
| 974 |
ret = bs->drv->bdrv_set_key(bs, key); |
| 975 |
if (ret < 0) { |
| 976 |
bs->valid_key = 0;
|
| 977 |
} else if (!bs->valid_key) { |
| 978 |
bs->valid_key = 1;
|
| 979 |
/* call the change callback now, we skipped it on open */
|
| 980 |
bs->media_changed = 1;
|
| 981 |
if (bs->change_cb)
|
| 982 |
bs->change_cb(bs->change_opaque); |
| 983 |
} |
| 984 |
return ret;
|
| 985 |
} |
| 986 |
|
| 987 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 988 |
{
|
| 989 |
if (!bs->drv) {
|
| 990 |
buf[0] = '\0'; |
| 991 |
} else {
|
| 992 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 993 |
} |
| 994 |
} |
| 995 |
|
| 996 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 997 |
void *opaque)
|
| 998 |
{
|
| 999 |
BlockDriver *drv; |
| 1000 |
|
| 1001 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
| 1002 |
it(opaque, drv->format_name); |
| 1003 |
} |
| 1004 |
} |
| 1005 |
|
| 1006 |
BlockDriverState *bdrv_find(const char *name) |
| 1007 |
{
|
| 1008 |
BlockDriverState *bs; |
| 1009 |
|
| 1010 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1011 |
if (!strcmp(name, bs->device_name))
|
| 1012 |
return bs;
|
| 1013 |
} |
| 1014 |
return NULL; |
| 1015 |
} |
| 1016 |
|
| 1017 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
| 1018 |
{
|
| 1019 |
BlockDriverState *bs; |
| 1020 |
|
| 1021 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1022 |
it(opaque, bs); |
| 1023 |
} |
| 1024 |
} |
| 1025 |
|
| 1026 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 1027 |
{
|
| 1028 |
return bs->device_name;
|
| 1029 |
} |
| 1030 |
|
| 1031 |
void bdrv_flush(BlockDriverState *bs)
|
| 1032 |
{
|
| 1033 |
if (!bs->drv)
|
| 1034 |
return;
|
| 1035 |
if (bs->drv->bdrv_flush)
|
| 1036 |
bs->drv->bdrv_flush(bs); |
| 1037 |
if (bs->backing_hd)
|
| 1038 |
bdrv_flush(bs->backing_hd); |
| 1039 |
} |
| 1040 |
|
| 1041 |
void bdrv_flush_all(void) |
| 1042 |
{
|
| 1043 |
BlockDriverState *bs; |
| 1044 |
|
| 1045 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
| 1046 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
| 1047 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
| 1048 |
bdrv_flush(bs); |
| 1049 |
} |
| 1050 |
|
| 1051 |
/*
|
| 1052 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 1053 |
* not implementing the functionality are assumed to not support backing files,
|
| 1054 |
* hence all their sectors are reported as allocated.
|
| 1055 |
*
|
| 1056 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 1057 |
* the specified sector) that are known to be in the same
|
| 1058 |
* allocated/unallocated state.
|
| 1059 |
*
|
| 1060 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
| 1061 |
*/
|
| 1062 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 1063 |
int *pnum)
|
| 1064 |
{
|
| 1065 |
int64_t n; |
| 1066 |
if (!bs->drv->bdrv_is_allocated) {
|
| 1067 |
if (sector_num >= bs->total_sectors) {
|
| 1068 |
*pnum = 0;
|
| 1069 |
return 0; |
| 1070 |
} |
| 1071 |
n = bs->total_sectors - sector_num; |
| 1072 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 1073 |
return 1; |
| 1074 |
} |
| 1075 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 1076 |
} |
| 1077 |
|
| 1078 |
void bdrv_info(Monitor *mon)
|
| 1079 |
{
|
| 1080 |
BlockDriverState *bs; |
| 1081 |
|
| 1082 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1083 |
monitor_printf(mon, "%s:", bs->device_name);
|
| 1084 |
monitor_printf(mon, " type=");
|
| 1085 |
switch(bs->type) {
|
| 1086 |
case BDRV_TYPE_HD:
|
| 1087 |
monitor_printf(mon, "hd");
|
| 1088 |
break;
|
| 1089 |
case BDRV_TYPE_CDROM:
|
| 1090 |
monitor_printf(mon, "cdrom");
|
| 1091 |
break;
|
| 1092 |
case BDRV_TYPE_FLOPPY:
|
| 1093 |
monitor_printf(mon, "floppy");
|
| 1094 |
break;
|
| 1095 |
} |
| 1096 |
monitor_printf(mon, " removable=%d", bs->removable);
|
| 1097 |
if (bs->removable) {
|
| 1098 |
monitor_printf(mon, " locked=%d", bs->locked);
|
| 1099 |
} |
| 1100 |
if (bs->drv) {
|
| 1101 |
monitor_printf(mon, " file=");
|
| 1102 |
monitor_print_filename(mon, bs->filename); |
| 1103 |
if (bs->backing_file[0] != '\0') { |
| 1104 |
monitor_printf(mon, " backing_file=");
|
| 1105 |
monitor_print_filename(mon, bs->backing_file); |
| 1106 |
} |
| 1107 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
| 1108 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
| 1109 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
| 1110 |
} else {
|
| 1111 |
monitor_printf(mon, " [not inserted]");
|
| 1112 |
} |
| 1113 |
monitor_printf(mon, "\n");
|
| 1114 |
} |
| 1115 |
} |
| 1116 |
|
| 1117 |
/* The "info blockstats" command. */
|
| 1118 |
void bdrv_info_stats(Monitor *mon)
|
| 1119 |
{
|
| 1120 |
BlockDriverState *bs; |
| 1121 |
|
| 1122 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1123 |
monitor_printf(mon, "%s:"
|
| 1124 |
" rd_bytes=%" PRIu64
|
| 1125 |
" wr_bytes=%" PRIu64
|
| 1126 |
" rd_operations=%" PRIu64
|
| 1127 |
" wr_operations=%" PRIu64
|
| 1128 |
"\n",
|
| 1129 |
bs->device_name, |
| 1130 |
bs->rd_bytes, bs->wr_bytes, |
| 1131 |
bs->rd_ops, bs->wr_ops); |
| 1132 |
} |
| 1133 |
} |
| 1134 |
|
| 1135 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 1136 |
{
|
| 1137 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 1138 |
return bs->backing_file;
|
| 1139 |
else if (bs->encrypted) |
| 1140 |
return bs->filename;
|
| 1141 |
else
|
| 1142 |
return NULL; |
| 1143 |
} |
| 1144 |
|
| 1145 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 1146 |
char *filename, int filename_size) |
| 1147 |
{
|
| 1148 |
if (!bs->backing_hd) {
|
| 1149 |
pstrcpy(filename, filename_size, "");
|
| 1150 |
} else {
|
| 1151 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 1152 |
} |
| 1153 |
} |
| 1154 |
|
| 1155 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 1156 |
const uint8_t *buf, int nb_sectors) |
| 1157 |
{
|
| 1158 |
BlockDriver *drv = bs->drv; |
| 1159 |
if (!drv)
|
| 1160 |
return -ENOMEDIUM;
|
| 1161 |
if (!drv->bdrv_write_compressed)
|
| 1162 |
return -ENOTSUP;
|
| 1163 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1164 |
return -EIO;
|
| 1165 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 1166 |
} |
| 1167 |
|
| 1168 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 1169 |
{
|
| 1170 |
BlockDriver *drv = bs->drv; |
| 1171 |
if (!drv)
|
| 1172 |
return -ENOMEDIUM;
|
| 1173 |
if (!drv->bdrv_get_info)
|
| 1174 |
return -ENOTSUP;
|
| 1175 |
memset(bdi, 0, sizeof(*bdi)); |
| 1176 |
return drv->bdrv_get_info(bs, bdi);
|
| 1177 |
} |
| 1178 |
|
| 1179 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 1180 |
int64_t pos, int size)
|
| 1181 |
{
|
| 1182 |
BlockDriver *drv = bs->drv; |
| 1183 |
if (!drv)
|
| 1184 |
return -ENOMEDIUM;
|
| 1185 |
if (!drv->bdrv_save_vmstate)
|
| 1186 |
return -ENOTSUP;
|
| 1187 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
| 1188 |
} |
| 1189 |
|
| 1190 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
| 1191 |
int64_t pos, int size)
|
| 1192 |
{
|
| 1193 |
BlockDriver *drv = bs->drv; |
| 1194 |
if (!drv)
|
| 1195 |
return -ENOMEDIUM;
|
| 1196 |
if (!drv->bdrv_load_vmstate)
|
| 1197 |
return -ENOTSUP;
|
| 1198 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
| 1199 |
} |
| 1200 |
|
| 1201 |
/**************************************************************/
|
| 1202 |
/* handling of snapshots */
|
| 1203 |
|
| 1204 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 1205 |
QEMUSnapshotInfo *sn_info) |
| 1206 |
{
|
| 1207 |
BlockDriver *drv = bs->drv; |
| 1208 |
if (!drv)
|
| 1209 |
return -ENOMEDIUM;
|
| 1210 |
if (!drv->bdrv_snapshot_create)
|
| 1211 |
return -ENOTSUP;
|
| 1212 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 1213 |
} |
| 1214 |
|
| 1215 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 1216 |
const char *snapshot_id) |
| 1217 |
{
|
| 1218 |
BlockDriver *drv = bs->drv; |
| 1219 |
if (!drv)
|
| 1220 |
return -ENOMEDIUM;
|
| 1221 |
if (!drv->bdrv_snapshot_goto)
|
| 1222 |
return -ENOTSUP;
|
| 1223 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 1224 |
} |
| 1225 |
|
| 1226 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1227 |
{
|
| 1228 |
BlockDriver *drv = bs->drv; |
| 1229 |
if (!drv)
|
| 1230 |
return -ENOMEDIUM;
|
| 1231 |
if (!drv->bdrv_snapshot_delete)
|
| 1232 |
return -ENOTSUP;
|
| 1233 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 1234 |
} |
| 1235 |
|
| 1236 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 1237 |
QEMUSnapshotInfo **psn_info) |
| 1238 |
{
|
| 1239 |
BlockDriver *drv = bs->drv; |
| 1240 |
if (!drv)
|
| 1241 |
return -ENOMEDIUM;
|
| 1242 |
if (!drv->bdrv_snapshot_list)
|
| 1243 |
return -ENOTSUP;
|
| 1244 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 1245 |
} |
| 1246 |
|
| 1247 |
#define NB_SUFFIXES 4 |
| 1248 |
|
| 1249 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1250 |
{
|
| 1251 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1252 |
int64_t base; |
| 1253 |
int i;
|
| 1254 |
|
| 1255 |
if (size <= 999) { |
| 1256 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 1257 |
} else {
|
| 1258 |
base = 1024;
|
| 1259 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 1260 |
if (size < (10 * base)) { |
| 1261 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 1262 |
(double)size / base,
|
| 1263 |
suffixes[i]); |
| 1264 |
break;
|
| 1265 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1266 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1267 |
((size + (base >> 1)) / base),
|
| 1268 |
suffixes[i]); |
| 1269 |
break;
|
| 1270 |
} |
| 1271 |
base = base * 1024;
|
| 1272 |
} |
| 1273 |
} |
| 1274 |
return buf;
|
| 1275 |
} |
| 1276 |
|
| 1277 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1278 |
{
|
| 1279 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 1280 |
#ifdef _WIN32
|
| 1281 |
struct tm *ptm;
|
| 1282 |
#else
|
| 1283 |
struct tm tm;
|
| 1284 |
#endif
|
| 1285 |
time_t ti; |
| 1286 |
int64_t secs; |
| 1287 |
|
| 1288 |
if (!sn) {
|
| 1289 |
snprintf(buf, buf_size, |
| 1290 |
"%-10s%-20s%7s%20s%15s",
|
| 1291 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1292 |
} else {
|
| 1293 |
ti = sn->date_sec; |
| 1294 |
#ifdef _WIN32
|
| 1295 |
ptm = localtime(&ti); |
| 1296 |
strftime(date_buf, sizeof(date_buf),
|
| 1297 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 1298 |
#else
|
| 1299 |
localtime_r(&ti, &tm); |
| 1300 |
strftime(date_buf, sizeof(date_buf),
|
| 1301 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 1302 |
#endif
|
| 1303 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 1304 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 1305 |
"%02d:%02d:%02d.%03d",
|
| 1306 |
(int)(secs / 3600), |
| 1307 |
(int)((secs / 60) % 60), |
| 1308 |
(int)(secs % 60), |
| 1309 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1310 |
snprintf(buf, buf_size, |
| 1311 |
"%-10s%-20s%7s%20s%15s",
|
| 1312 |
sn->id_str, sn->name, |
| 1313 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 1314 |
date_buf, |
| 1315 |
clock_buf); |
| 1316 |
} |
| 1317 |
return buf;
|
| 1318 |
} |
| 1319 |
|
| 1320 |
|
| 1321 |
/**************************************************************/
|
| 1322 |
/* async I/Os */
|
| 1323 |
|
| 1324 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 1325 |
QEMUIOVector *qiov, int nb_sectors,
|
| 1326 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1327 |
{
|
| 1328 |
BlockDriver *drv = bs->drv; |
| 1329 |
BlockDriverAIOCB *ret; |
| 1330 |
|
| 1331 |
if (!drv)
|
| 1332 |
return NULL; |
| 1333 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1334 |
return NULL; |
| 1335 |
|
| 1336 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
| 1337 |
cb, opaque); |
| 1338 |
|
| 1339 |
if (ret) {
|
| 1340 |
/* Update stats even though technically transfer has not happened. */
|
| 1341 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1342 |
bs->rd_ops ++; |
| 1343 |
} |
| 1344 |
|
| 1345 |
return ret;
|
| 1346 |
} |
| 1347 |
|
| 1348 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 1349 |
QEMUIOVector *qiov, int nb_sectors,
|
| 1350 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1351 |
{
|
| 1352 |
BlockDriver *drv = bs->drv; |
| 1353 |
BlockDriverAIOCB *ret; |
| 1354 |
|
| 1355 |
if (!drv)
|
| 1356 |
return NULL; |
| 1357 |
if (bs->read_only)
|
| 1358 |
return NULL; |
| 1359 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1360 |
return NULL; |
| 1361 |
|
| 1362 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
| 1363 |
cb, opaque); |
| 1364 |
|
| 1365 |
if (ret) {
|
| 1366 |
/* Update stats even though technically transfer has not happened. */
|
| 1367 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1368 |
bs->wr_ops ++; |
| 1369 |
} |
| 1370 |
|
| 1371 |
return ret;
|
| 1372 |
} |
| 1373 |
|
| 1374 |
|
| 1375 |
typedef struct MultiwriteCB { |
| 1376 |
int error;
|
| 1377 |
int num_requests;
|
| 1378 |
int num_callbacks;
|
| 1379 |
struct {
|
| 1380 |
BlockDriverCompletionFunc *cb; |
| 1381 |
void *opaque;
|
| 1382 |
QEMUIOVector *free_qiov; |
| 1383 |
void *free_buf;
|
| 1384 |
} callbacks[]; |
| 1385 |
} MultiwriteCB; |
| 1386 |
|
| 1387 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 1388 |
{
|
| 1389 |
int i;
|
| 1390 |
|
| 1391 |
for (i = 0; i < mcb->num_callbacks; i++) { |
| 1392 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
| 1393 |
qemu_free(mcb->callbacks[i].free_qiov); |
| 1394 |
qemu_free(mcb->callbacks[i].free_buf); |
| 1395 |
} |
| 1396 |
} |
| 1397 |
|
| 1398 |
static void multiwrite_cb(void *opaque, int ret) |
| 1399 |
{
|
| 1400 |
MultiwriteCB *mcb = opaque; |
| 1401 |
|
| 1402 |
if (ret < 0) { |
| 1403 |
mcb->error = ret; |
| 1404 |
multiwrite_user_cb(mcb); |
| 1405 |
} |
| 1406 |
|
| 1407 |
mcb->num_requests--; |
| 1408 |
if (mcb->num_requests == 0) { |
| 1409 |
if (mcb->error == 0) { |
| 1410 |
multiwrite_user_cb(mcb); |
| 1411 |
} |
| 1412 |
qemu_free(mcb); |
| 1413 |
} |
| 1414 |
} |
| 1415 |
|
| 1416 |
static int multiwrite_req_compare(const void *a, const void *b) |
| 1417 |
{
|
| 1418 |
return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
| 1419 |
} |
| 1420 |
|
| 1421 |
/*
|
| 1422 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
| 1423 |
* requests that remain after merging.
|
| 1424 |
*/
|
| 1425 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 1426 |
int num_reqs, MultiwriteCB *mcb)
|
| 1427 |
{
|
| 1428 |
int i, outidx;
|
| 1429 |
|
| 1430 |
// Sort requests by start sector
|
| 1431 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
| 1432 |
|
| 1433 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
| 1434 |
// filling up gaps with zero sectors.
|
| 1435 |
outidx = 0;
|
| 1436 |
for (i = 1; i < num_reqs; i++) { |
| 1437 |
int merge = 0; |
| 1438 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 1439 |
|
| 1440 |
// This handles the cases that are valid for all block drivers, namely
|
| 1441 |
// exactly sequential writes and overlapping writes.
|
| 1442 |
if (reqs[i].sector <= oldreq_last) {
|
| 1443 |
merge = 1;
|
| 1444 |
} |
| 1445 |
|
| 1446 |
// The block driver may decide that it makes sense to combine requests
|
| 1447 |
// even if there is a gap of some sectors between them. In this case,
|
| 1448 |
// the gap is filled with zeros (therefore only applicable for yet
|
| 1449 |
// unused space in format like qcow2).
|
| 1450 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
| 1451 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
| 1452 |
} |
| 1453 |
|
| 1454 |
if (merge) {
|
| 1455 |
size_t size; |
| 1456 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
| 1457 |
qemu_iovec_init(qiov, |
| 1458 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
| 1459 |
|
| 1460 |
// Add the first request to the merged one. If the requests are
|
| 1461 |
// overlapping, drop the last sectors of the first request.
|
| 1462 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
| 1463 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
| 1464 |
|
| 1465 |
// We might need to add some zeros between the two requests
|
| 1466 |
if (reqs[i].sector > oldreq_last) {
|
| 1467 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
| 1468 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
| 1469 |
memset(buf, 0, zero_bytes);
|
| 1470 |
qemu_iovec_add(qiov, buf, zero_bytes); |
| 1471 |
mcb->callbacks[i].free_buf = buf; |
| 1472 |
} |
| 1473 |
|
| 1474 |
// Add the second request
|
| 1475 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
| 1476 |
|
| 1477 |
reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
| 1478 |
reqs[outidx].qiov = qiov; |
| 1479 |
|
| 1480 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 1481 |
} else {
|
| 1482 |
outidx++; |
| 1483 |
reqs[outidx].sector = reqs[i].sector; |
| 1484 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 1485 |
reqs[outidx].qiov = reqs[i].qiov; |
| 1486 |
} |
| 1487 |
} |
| 1488 |
|
| 1489 |
return outidx + 1; |
| 1490 |
} |
| 1491 |
|
| 1492 |
/*
|
| 1493 |
* Submit multiple AIO write requests at once.
|
| 1494 |
*
|
| 1495 |
* On success, the function returns 0 and all requests in the reqs array have
|
| 1496 |
* been submitted. In error case this function returns -1, and any of the
|
| 1497 |
* requests may or may not be submitted yet. In particular, this means that the
|
| 1498 |
* callback will be called for some of the requests, for others it won't. The
|
| 1499 |
* caller must check the error field of the BlockRequest to wait for the right
|
| 1500 |
* callbacks (if error != 0, no callback will be called).
|
| 1501 |
*
|
| 1502 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
| 1503 |
* requests. However, the fields opaque and error are left unmodified as they
|
| 1504 |
* are used to signal failure for a single request to the caller.
|
| 1505 |
*/
|
| 1506 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 1507 |
{
|
| 1508 |
BlockDriverAIOCB *acb; |
| 1509 |
MultiwriteCB *mcb; |
| 1510 |
int i;
|
| 1511 |
|
| 1512 |
if (num_reqs == 0) { |
| 1513 |
return 0; |
| 1514 |
} |
| 1515 |
|
| 1516 |
// Create MultiwriteCB structure
|
| 1517 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
| 1518 |
mcb->num_requests = 0;
|
| 1519 |
mcb->num_callbacks = num_reqs; |
| 1520 |
|
| 1521 |
for (i = 0; i < num_reqs; i++) { |
| 1522 |
mcb->callbacks[i].cb = reqs[i].cb; |
| 1523 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
| 1524 |
} |
| 1525 |
|
| 1526 |
// Check for mergable requests
|
| 1527 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 1528 |
|
| 1529 |
// Run the aio requests
|
| 1530 |
for (i = 0; i < num_reqs; i++) { |
| 1531 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
| 1532 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
| 1533 |
|
| 1534 |
if (acb == NULL) { |
| 1535 |
// We can only fail the whole thing if no request has been
|
| 1536 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
| 1537 |
// complete and report the error in the callback.
|
| 1538 |
if (mcb->num_requests == 0) { |
| 1539 |
reqs[i].error = EIO; |
| 1540 |
goto fail;
|
| 1541 |
} else {
|
| 1542 |
mcb->error = EIO; |
| 1543 |
break;
|
| 1544 |
} |
| 1545 |
} else {
|
| 1546 |
mcb->num_requests++; |
| 1547 |
} |
| 1548 |
} |
| 1549 |
|
| 1550 |
return 0; |
| 1551 |
|
| 1552 |
fail:
|
| 1553 |
free(mcb); |
| 1554 |
return -1; |
| 1555 |
} |
| 1556 |
|
| 1557 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
| 1558 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1559 |
{
|
| 1560 |
BlockDriver *drv = bs->drv; |
| 1561 |
|
| 1562 |
if (!drv)
|
| 1563 |
return NULL; |
| 1564 |
|
| 1565 |
/*
|
| 1566 |
* Note that unlike bdrv_flush the driver is reponsible for flushing a
|
| 1567 |
* backing image if it exists.
|
| 1568 |
*/
|
| 1569 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
| 1570 |
} |
| 1571 |
|
| 1572 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 1573 |
{
|
| 1574 |
acb->pool->cancel(acb); |
| 1575 |
} |
| 1576 |
|
| 1577 |
|
| 1578 |
/**************************************************************/
|
| 1579 |
/* async block device emulation */
|
| 1580 |
|
| 1581 |
typedef struct BlockDriverAIOCBSync { |
| 1582 |
BlockDriverAIOCB common; |
| 1583 |
QEMUBH *bh; |
| 1584 |
int ret;
|
| 1585 |
/* vector translation state */
|
| 1586 |
QEMUIOVector *qiov; |
| 1587 |
uint8_t *bounce; |
| 1588 |
int is_write;
|
| 1589 |
} BlockDriverAIOCBSync; |
| 1590 |
|
| 1591 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 1592 |
{
|
| 1593 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
| 1594 |
qemu_bh_delete(acb->bh); |
| 1595 |
acb->bh = NULL;
|
| 1596 |
qemu_aio_release(acb); |
| 1597 |
} |
| 1598 |
|
| 1599 |
static AIOPool bdrv_em_aio_pool = {
|
| 1600 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
| 1601 |
.cancel = bdrv_aio_cancel_em, |
| 1602 |
}; |
| 1603 |
|
| 1604 |
static void bdrv_aio_bh_cb(void *opaque) |
| 1605 |
{
|
| 1606 |
BlockDriverAIOCBSync *acb = opaque; |
| 1607 |
|
| 1608 |
if (!acb->is_write)
|
| 1609 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
| 1610 |
qemu_vfree(acb->bounce); |
| 1611 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 1612 |
qemu_bh_delete(acb->bh); |
| 1613 |
acb->bh = NULL;
|
| 1614 |
qemu_aio_release(acb); |
| 1615 |
} |
| 1616 |
|
| 1617 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
| 1618 |
int64_t sector_num, |
| 1619 |
QEMUIOVector *qiov, |
| 1620 |
int nb_sectors,
|
| 1621 |
BlockDriverCompletionFunc *cb, |
| 1622 |
void *opaque,
|
| 1623 |
int is_write)
|
| 1624 |
|
| 1625 |
{
|
| 1626 |
BlockDriverAIOCBSync *acb; |
| 1627 |
|
| 1628 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 1629 |
acb->is_write = is_write; |
| 1630 |
acb->qiov = qiov; |
| 1631 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
| 1632 |
|
| 1633 |
if (!acb->bh)
|
| 1634 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1635 |
|
| 1636 |
if (is_write) {
|
| 1637 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
| 1638 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
| 1639 |
} else {
|
| 1640 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
| 1641 |
} |
| 1642 |
|
| 1643 |
qemu_bh_schedule(acb->bh); |
| 1644 |
|
| 1645 |
return &acb->common;
|
| 1646 |
} |
| 1647 |
|
| 1648 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
| 1649 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 1650 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1651 |
{
|
| 1652 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
| 1653 |
} |
| 1654 |
|
| 1655 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
| 1656 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 1657 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1658 |
{
|
| 1659 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 1660 |
} |
| 1661 |
|
| 1662 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
| 1663 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1664 |
{
|
| 1665 |
BlockDriverAIOCBSync *acb; |
| 1666 |
|
| 1667 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 1668 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
| 1669 |
acb->qiov = NULL;
|
| 1670 |
acb->bounce = NULL;
|
| 1671 |
acb->ret = 0;
|
| 1672 |
|
| 1673 |
if (!acb->bh)
|
| 1674 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1675 |
|
| 1676 |
bdrv_flush(bs); |
| 1677 |
qemu_bh_schedule(acb->bh); |
| 1678 |
return &acb->common;
|
| 1679 |
} |
| 1680 |
|
| 1681 |
/**************************************************************/
|
| 1682 |
/* sync block device emulation */
|
| 1683 |
|
| 1684 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
| 1685 |
{
|
| 1686 |
*(int *)opaque = ret;
|
| 1687 |
} |
| 1688 |
|
| 1689 |
#define NOT_DONE 0x7fffffff |
| 1690 |
|
| 1691 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 1692 |
uint8_t *buf, int nb_sectors)
|
| 1693 |
{
|
| 1694 |
int async_ret;
|
| 1695 |
BlockDriverAIOCB *acb; |
| 1696 |
struct iovec iov;
|
| 1697 |
QEMUIOVector qiov; |
| 1698 |
|
| 1699 |
async_ret = NOT_DONE; |
| 1700 |
iov.iov_base = (void *)buf;
|
| 1701 |
iov.iov_len = nb_sectors * 512;
|
| 1702 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 1703 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
| 1704 |
bdrv_rw_em_cb, &async_ret); |
| 1705 |
if (acb == NULL) |
| 1706 |
return -1; |
| 1707 |
|
| 1708 |
while (async_ret == NOT_DONE) {
|
| 1709 |
qemu_aio_wait(); |
| 1710 |
} |
| 1711 |
|
| 1712 |
return async_ret;
|
| 1713 |
} |
| 1714 |
|
| 1715 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 1716 |
const uint8_t *buf, int nb_sectors) |
| 1717 |
{
|
| 1718 |
int async_ret;
|
| 1719 |
BlockDriverAIOCB *acb; |
| 1720 |
struct iovec iov;
|
| 1721 |
QEMUIOVector qiov; |
| 1722 |
|
| 1723 |
async_ret = NOT_DONE; |
| 1724 |
iov.iov_base = (void *)buf;
|
| 1725 |
iov.iov_len = nb_sectors * 512;
|
| 1726 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 1727 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
| 1728 |
bdrv_rw_em_cb, &async_ret); |
| 1729 |
if (acb == NULL) |
| 1730 |
return -1; |
| 1731 |
while (async_ret == NOT_DONE) {
|
| 1732 |
qemu_aio_wait(); |
| 1733 |
} |
| 1734 |
return async_ret;
|
| 1735 |
} |
| 1736 |
|
| 1737 |
void bdrv_init(void) |
| 1738 |
{
|
| 1739 |
module_call_init(MODULE_INIT_BLOCK); |
| 1740 |
} |
| 1741 |
|
| 1742 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
| 1743 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1744 |
{
|
| 1745 |
BlockDriverAIOCB *acb; |
| 1746 |
|
| 1747 |
if (pool->free_aiocb) {
|
| 1748 |
acb = pool->free_aiocb; |
| 1749 |
pool->free_aiocb = acb->next; |
| 1750 |
} else {
|
| 1751 |
acb = qemu_mallocz(pool->aiocb_size); |
| 1752 |
acb->pool = pool; |
| 1753 |
} |
| 1754 |
acb->bs = bs; |
| 1755 |
acb->cb = cb; |
| 1756 |
acb->opaque = opaque; |
| 1757 |
return acb;
|
| 1758 |
} |
| 1759 |
|
| 1760 |
void qemu_aio_release(void *p) |
| 1761 |
{
|
| 1762 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
| 1763 |
AIOPool *pool = acb->pool; |
| 1764 |
acb->next = pool->free_aiocb; |
| 1765 |
pool->free_aiocb = acb; |
| 1766 |
} |
| 1767 |
|
| 1768 |
/**************************************************************/
|
| 1769 |
/* removable device support */
|
| 1770 |
|
| 1771 |
/**
|
| 1772 |
* Return TRUE if the media is present
|
| 1773 |
*/
|
| 1774 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 1775 |
{
|
| 1776 |
BlockDriver *drv = bs->drv; |
| 1777 |
int ret;
|
| 1778 |
if (!drv)
|
| 1779 |
return 0; |
| 1780 |
if (!drv->bdrv_is_inserted)
|
| 1781 |
return 1; |
| 1782 |
ret = drv->bdrv_is_inserted(bs); |
| 1783 |
return ret;
|
| 1784 |
} |
| 1785 |
|
| 1786 |
/**
|
| 1787 |
* Return TRUE if the media changed since the last call to this
|
| 1788 |
* function. It is currently only used for floppy disks
|
| 1789 |
*/
|
| 1790 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 1791 |
{
|
| 1792 |
BlockDriver *drv = bs->drv; |
| 1793 |
int ret;
|
| 1794 |
|
| 1795 |
if (!drv || !drv->bdrv_media_changed)
|
| 1796 |
ret = -ENOTSUP; |
| 1797 |
else
|
| 1798 |
ret = drv->bdrv_media_changed(bs); |
| 1799 |
if (ret == -ENOTSUP)
|
| 1800 |
ret = bs->media_changed; |
| 1801 |
bs->media_changed = 0;
|
| 1802 |
return ret;
|
| 1803 |
} |
| 1804 |
|
| 1805 |
/**
|
| 1806 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 1807 |
*/
|
| 1808 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 1809 |
{
|
| 1810 |
BlockDriver *drv = bs->drv; |
| 1811 |
int ret;
|
| 1812 |
|
| 1813 |
if (bs->locked) {
|
| 1814 |
return -EBUSY;
|
| 1815 |
} |
| 1816 |
|
| 1817 |
if (!drv || !drv->bdrv_eject) {
|
| 1818 |
ret = -ENOTSUP; |
| 1819 |
} else {
|
| 1820 |
ret = drv->bdrv_eject(bs, eject_flag); |
| 1821 |
} |
| 1822 |
if (ret == -ENOTSUP) {
|
| 1823 |
if (eject_flag)
|
| 1824 |
bdrv_close(bs); |
| 1825 |
ret = 0;
|
| 1826 |
} |
| 1827 |
|
| 1828 |
return ret;
|
| 1829 |
} |
| 1830 |
|
| 1831 |
int bdrv_is_locked(BlockDriverState *bs)
|
| 1832 |
{
|
| 1833 |
return bs->locked;
|
| 1834 |
} |
| 1835 |
|
| 1836 |
/**
|
| 1837 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 1838 |
* to eject it manually).
|
| 1839 |
*/
|
| 1840 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 1841 |
{
|
| 1842 |
BlockDriver *drv = bs->drv; |
| 1843 |
|
| 1844 |
bs->locked = locked; |
| 1845 |
if (drv && drv->bdrv_set_locked) {
|
| 1846 |
drv->bdrv_set_locked(bs, locked); |
| 1847 |
} |
| 1848 |
} |
| 1849 |
|
| 1850 |
/* needed for generic scsi interface */
|
| 1851 |
|
| 1852 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 1853 |
{
|
| 1854 |
BlockDriver *drv = bs->drv; |
| 1855 |
|
| 1856 |
if (drv && drv->bdrv_ioctl)
|
| 1857 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 1858 |
return -ENOTSUP;
|
| 1859 |
} |
| 1860 |
|
| 1861 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 1862 |
unsigned long int req, void *buf, |
| 1863 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1864 |
{
|
| 1865 |
BlockDriver *drv = bs->drv; |
| 1866 |
|
| 1867 |
if (drv && drv->bdrv_aio_ioctl)
|
| 1868 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
| 1869 |
return NULL; |
| 1870 |
} |
| 1871 |
|
| 1872 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
| 1873 |
{
|
| 1874 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
| 1875 |
} |