mirror of
https://github.com/xemu-project/xemu.git
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b5eff35546
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4041 c046a42c-6fe2-441c-8c8c-71466251a162
1417 lines
36 KiB
C
1417 lines
36 KiB
C
/*
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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"
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#ifndef QEMU_IMG
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#include "console.h"
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#endif
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#include "block_int.h"
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#ifdef _BSD
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/queue.h>
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#include <sys/disk.h>
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#endif
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#define SECTOR_BITS 9
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#define SECTOR_SIZE (1 << SECTOR_BITS)
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typedef struct BlockDriverAIOCBSync {
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BlockDriverAIOCB common;
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QEMUBH *bh;
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int ret;
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} BlockDriverAIOCBSync;
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static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
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int64_t sector_num, const uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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BlockDriverState *bdrv_first;
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static BlockDriver *first_drv;
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int path_is_absolute(const char *path)
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{
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const char *p;
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#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
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if (*path == '/' || *path == '\\')
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return 1;
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#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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}
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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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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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}
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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;
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}
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bdrv->next = first_drv;
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first_drv = bdrv;
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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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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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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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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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}
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size)
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{
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char temp_dir[MAX_PATH];
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GetTempPath(MAX_PATH, temp_dir);
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GetTempFileName(temp_dir, "qem", 0, filename);
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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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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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#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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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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static BlockDriver *find_protocol(const char *filename)
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{
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BlockDriver *drv1;
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char protocol[128];
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int len;
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const char *p;
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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, ':');
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if (!p)
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return &bdrv_raw;
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len = p - filename;
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if (len > sizeof(protocol) - 1)
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len = sizeof(protocol) - 1;
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memcpy(protocol, filename, len);
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protocol[len] = '\0';
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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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;
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}
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/* XXX: force raw format if block or character device ? It would
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simplify the BSD case */
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static BlockDriver *find_image_format(const char *filename)
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{
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int ret, score, score_max;
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BlockDriver *drv1, *drv;
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uint8_t buf[2048];
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BlockDriverState *bs;
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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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if (strstart(filename, "/dev/cdrom", NULL))
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return &bdrv_host_device;
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#ifdef _WIN32
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if (is_windows_drive(filename))
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return &bdrv_host_device;
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#else
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{
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struct stat st;
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if (stat(filename, &st) >= 0 &&
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(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
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return &bdrv_host_device;
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}
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}
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#endif
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drv = find_protocol(filename);
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/* no need to test disk image formats for vvfat */
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if (drv == &bdrv_vvfat)
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return drv;
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ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
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if (ret < 0)
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return NULL;
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ret = bdrv_pread(bs, 0, buf, sizeof(buf));
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bdrv_delete(bs);
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if (ret < 0) {
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return NULL;
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}
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score_max = 0;
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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if (drv1->bdrv_probe) {
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score = drv1->bdrv_probe(buf, ret, filename);
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if (score > score_max) {
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score_max = score;
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drv = drv1;
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}
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}
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}
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return drv;
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}
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int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
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{
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BlockDriverState *bs;
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int ret;
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bs = bdrv_new("");
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if (!bs)
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return -ENOMEM;
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ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
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if (ret < 0) {
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bdrv_delete(bs);
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return ret;
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}
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*pbs = bs;
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return 0;
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}
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int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
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{
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return bdrv_open2(bs, filename, flags, NULL);
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}
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int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
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BlockDriver *drv)
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{
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int ret, open_flags;
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char tmp_filename[PATH_MAX];
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char backing_filename[PATH_MAX];
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bs->read_only = 0;
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bs->is_temporary = 0;
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bs->encrypted = 0;
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if (flags & BDRV_O_SNAPSHOT) {
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BlockDriverState *bs1;
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int64_t total_size;
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/* if snapshot, we create a temporary backing file and open it
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instead of opening 'filename' directly */
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/* if there is a backing file, use it */
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bs1 = bdrv_new("");
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if (!bs1) {
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return -ENOMEM;
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}
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if (bdrv_open(bs1, filename, 0) < 0) {
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bdrv_delete(bs1);
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return -1;
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}
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total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
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bdrv_delete(bs1);
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get_tmp_filename(tmp_filename, sizeof(tmp_filename));
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realpath(filename, backing_filename);
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if (bdrv_create(&bdrv_qcow2, tmp_filename,
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total_size, backing_filename, 0) < 0) {
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return -1;
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}
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filename = tmp_filename;
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bs->is_temporary = 1;
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}
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pstrcpy(bs->filename, sizeof(bs->filename), filename);
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if (flags & BDRV_O_FILE) {
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drv = find_protocol(filename);
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if (!drv)
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return -ENOENT;
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} else {
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if (!drv) {
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drv = find_image_format(filename);
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if (!drv)
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return -1;
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}
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}
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bs->drv = drv;
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bs->opaque = qemu_mallocz(drv->instance_size);
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if (bs->opaque == NULL && drv->instance_size > 0)
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return -1;
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/* Note: for compatibility, we open disk image files as RDWR, and
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RDONLY as fallback */
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if (!(flags & BDRV_O_FILE))
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open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT);
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else
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open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
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ret = drv->bdrv_open(bs, filename, open_flags);
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if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
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ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
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bs->read_only = 1;
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}
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if (ret < 0) {
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qemu_free(bs->opaque);
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bs->opaque = NULL;
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bs->drv = NULL;
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return ret;
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}
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if (drv->bdrv_getlength) {
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bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
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}
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#ifndef _WIN32
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if (bs->is_temporary) {
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unlink(filename);
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}
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#endif
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if (bs->backing_file[0] != '\0') {
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/* if there is a backing file, use it */
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bs->backing_hd = bdrv_new("");
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if (!bs->backing_hd) {
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fail:
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bdrv_close(bs);
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return -ENOMEM;
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}
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path_combine(backing_filename, sizeof(backing_filename),
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filename, bs->backing_file);
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if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
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goto fail;
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}
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|
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/* call the change callback */
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bs->media_changed = 1;
|
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if (bs->change_cb)
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bs->change_cb(bs->change_opaque);
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|
|
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return 0;
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}
|
|
|
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void bdrv_close(BlockDriverState *bs)
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{
|
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if (bs->drv) {
|
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if (bs->backing_hd)
|
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bdrv_delete(bs->backing_hd);
|
|
bs->drv->bdrv_close(bs);
|
|
qemu_free(bs->opaque);
|
|
#ifdef _WIN32
|
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if (bs->is_temporary) {
|
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unlink(bs->filename);
|
|
}
|
|
#endif
|
|
bs->opaque = NULL;
|
|
bs->drv = NULL;
|
|
|
|
/* call the change callback */
|
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bs->media_changed = 1;
|
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if (bs->change_cb)
|
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bs->change_cb(bs->change_opaque);
|
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}
|
|
}
|
|
|
|
void bdrv_delete(BlockDriverState *bs)
|
|
{
|
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/* XXX: remove the driver list */
|
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bdrv_close(bs);
|
|
qemu_free(bs);
|
|
}
|
|
|
|
/* commit COW file into the raw image */
|
|
int bdrv_commit(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int64_t i, total_sectors;
|
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int n, j;
|
|
unsigned char sector[512];
|
|
|
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if (!drv)
|
|
return -ENOMEDIUM;
|
|
|
|
if (bs->read_only) {
|
|
return -EACCES;
|
|
}
|
|
|
|
if (!bs->backing_hd) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
|
|
for (i = 0; i < total_sectors;) {
|
|
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
|
|
for(j = 0; j < n; j++) {
|
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if (bdrv_read(bs, i, sector, 1) != 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
|
|
return -EIO;
|
|
}
|
|
i++;
|
|
}
|
|
} else {
|
|
i += n;
|
|
}
|
|
}
|
|
|
|
if (drv->bdrv_make_empty)
|
|
return drv->bdrv_make_empty(bs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* return < 0 if error. See bdrv_write() for the return codes */
|
|
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
|
|
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
memcpy(buf, bs->boot_sector_data, 512);
|
|
sector_num++;
|
|
nb_sectors--;
|
|
buf += 512;
|
|
if (nb_sectors == 0)
|
|
return 0;
|
|
}
|
|
if (drv->bdrv_pread) {
|
|
int ret, len;
|
|
len = nb_sectors * 512;
|
|
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (ret != len)
|
|
return -EINVAL;
|
|
else {
|
|
bs->rd_bytes += (unsigned) len;
|
|
bs->rd_ops ++;
|
|
return 0;
|
|
}
|
|
} else {
|
|
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
}
|
|
|
|
/* Return < 0 if error. Important errors are:
|
|
-EIO generic I/O error (may happen for all errors)
|
|
-ENOMEDIUM No media inserted.
|
|
-EINVAL Invalid sector number or nb_sectors
|
|
-EACCES Trying to write a read-only device
|
|
*/
|
|
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!bs->drv)
|
|
return -ENOMEDIUM;
|
|
if (bs->read_only)
|
|
return -EACCES;
|
|
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
memcpy(bs->boot_sector_data, buf, 512);
|
|
}
|
|
if (drv->bdrv_pwrite) {
|
|
int ret, len;
|
|
len = nb_sectors * 512;
|
|
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (ret != len)
|
|
return -EIO;
|
|
else {
|
|
bs->wr_bytes += (unsigned) len;
|
|
bs->wr_ops ++;
|
|
return 0;
|
|
}
|
|
} else {
|
|
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
}
|
|
|
|
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
|
|
uint8_t *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
|
|
count = count1;
|
|
/* first read to align to sector start */
|
|
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> SECTOR_BITS;
|
|
if (len > 0) {
|
|
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* read the sectors "in place" */
|
|
nb_sectors = count >> SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
|
|
return -EIO;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
memcpy(buf, tmp_buf, count);
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
|
|
const uint8_t *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
|
|
count = count1;
|
|
/* first write to align to sector start */
|
|
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> SECTOR_BITS;
|
|
if (len > 0) {
|
|
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
|
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* write the sectors "in place" */
|
|
nb_sectors = count >> SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
|
|
return -EIO;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
memcpy(tmp_buf, buf, count);
|
|
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
|
|
return -EIO;
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
/**
|
|
* Read with byte offsets (needed only for file protocols)
|
|
*/
|
|
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
|
void *buf1, int count1)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_pread)
|
|
return bdrv_pread_em(bs, offset, buf1, count1);
|
|
return drv->bdrv_pread(bs, offset, buf1, count1);
|
|
}
|
|
|
|
/**
|
|
* Write with byte offsets (needed only for file protocols)
|
|
*/
|
|
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
|
const void *buf1, int count1)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_pwrite)
|
|
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
|
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
|
}
|
|
|
|
/**
|
|
* Truncate file to 'offset' bytes (needed only for file protocols)
|
|
*/
|
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_truncate)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_truncate(bs, offset);
|
|
}
|
|
|
|
/**
|
|
* Length of a file in bytes. Return < 0 if error or unknown.
|
|
*/
|
|
int64_t bdrv_getlength(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_getlength) {
|
|
/* legacy mode */
|
|
return bs->total_sectors * SECTOR_SIZE;
|
|
}
|
|
return drv->bdrv_getlength(bs);
|
|
}
|
|
|
|
/* return 0 as number of sectors if no device present or error */
|
|
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
|
{
|
|
int64_t length;
|
|
length = bdrv_getlength(bs);
|
|
if (length < 0)
|
|
length = 0;
|
|
else
|
|
length = length >> SECTOR_BITS;
|
|
*nb_sectors_ptr = length;
|
|
}
|
|
|
|
/* force a given boot sector. */
|
|
void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
|
|
{
|
|
bs->boot_sector_enabled = 1;
|
|
if (size > 512)
|
|
size = 512;
|
|
memcpy(bs->boot_sector_data, data, size);
|
|
memset(bs->boot_sector_data + size, 0, 512 - size);
|
|
}
|
|
|
|
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
|
int cyls, int heads, int secs)
|
|
{
|
|
bs->cyls = cyls;
|
|
bs->heads = heads;
|
|
bs->secs = secs;
|
|
}
|
|
|
|
void bdrv_set_type_hint(BlockDriverState *bs, int type)
|
|
{
|
|
bs->type = type;
|
|
bs->removable = ((type == BDRV_TYPE_CDROM ||
|
|
type == BDRV_TYPE_FLOPPY));
|
|
}
|
|
|
|
void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
|
|
{
|
|
bs->translation = translation;
|
|
}
|
|
|
|
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
|
int *pcyls, int *pheads, int *psecs)
|
|
{
|
|
*pcyls = bs->cyls;
|
|
*pheads = bs->heads;
|
|
*psecs = bs->secs;
|
|
}
|
|
|
|
int bdrv_get_type_hint(BlockDriverState *bs)
|
|
{
|
|
return bs->type;
|
|
}
|
|
|
|
int bdrv_get_translation_hint(BlockDriverState *bs)
|
|
{
|
|
return bs->translation;
|
|
}
|
|
|
|
int bdrv_is_removable(BlockDriverState *bs)
|
|
{
|
|
return bs->removable;
|
|
}
|
|
|
|
int bdrv_is_read_only(BlockDriverState *bs)
|
|
{
|
|
return bs->read_only;
|
|
}
|
|
|
|
int bdrv_is_sg(BlockDriverState *bs)
|
|
{
|
|
return bs->sg;
|
|
}
|
|
|
|
/* XXX: no longer used */
|
|
void bdrv_set_change_cb(BlockDriverState *bs,
|
|
void (*change_cb)(void *opaque), void *opaque)
|
|
{
|
|
bs->change_cb = change_cb;
|
|
bs->change_opaque = opaque;
|
|
}
|
|
|
|
int bdrv_is_encrypted(BlockDriverState *bs)
|
|
{
|
|
if (bs->backing_hd && bs->backing_hd->encrypted)
|
|
return 1;
|
|
return bs->encrypted;
|
|
}
|
|
|
|
int bdrv_set_key(BlockDriverState *bs, const char *key)
|
|
{
|
|
int ret;
|
|
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
|
ret = bdrv_set_key(bs->backing_hd, key);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!bs->encrypted)
|
|
return 0;
|
|
}
|
|
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
|
return -1;
|
|
return bs->drv->bdrv_set_key(bs, key);
|
|
}
|
|
|
|
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
|
|
{
|
|
if (!bs->drv) {
|
|
buf[0] = '\0';
|
|
} else {
|
|
pstrcpy(buf, buf_size, bs->drv->format_name);
|
|
}
|
|
}
|
|
|
|
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
|
|
void *opaque)
|
|
{
|
|
BlockDriver *drv;
|
|
|
|
for (drv = first_drv; drv != NULL; drv = drv->next) {
|
|
it(opaque, drv->format_name);
|
|
}
|
|
}
|
|
|
|
BlockDriverState *bdrv_find(const char *name)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
|
|
if (!strcmp(name, bs->device_name))
|
|
return bs;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
|
|
it(opaque, bs->device_name);
|
|
}
|
|
}
|
|
|
|
const char *bdrv_get_device_name(BlockDriverState *bs)
|
|
{
|
|
return bs->device_name;
|
|
}
|
|
|
|
void bdrv_flush(BlockDriverState *bs)
|
|
{
|
|
if (bs->drv->bdrv_flush)
|
|
bs->drv->bdrv_flush(bs);
|
|
if (bs->backing_hd)
|
|
bdrv_flush(bs->backing_hd);
|
|
}
|
|
|
|
#ifndef QEMU_IMG
|
|
void bdrv_info(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
|
|
term_printf("%s:", bs->device_name);
|
|
term_printf(" type=");
|
|
switch(bs->type) {
|
|
case BDRV_TYPE_HD:
|
|
term_printf("hd");
|
|
break;
|
|
case BDRV_TYPE_CDROM:
|
|
term_printf("cdrom");
|
|
break;
|
|
case BDRV_TYPE_FLOPPY:
|
|
term_printf("floppy");
|
|
break;
|
|
}
|
|
term_printf(" removable=%d", bs->removable);
|
|
if (bs->removable) {
|
|
term_printf(" locked=%d", bs->locked);
|
|
}
|
|
if (bs->drv) {
|
|
term_printf(" file=");
|
|
term_print_filename(bs->filename);
|
|
if (bs->backing_file[0] != '\0') {
|
|
term_printf(" backing_file=");
|
|
term_print_filename(bs->backing_file);
|
|
}
|
|
term_printf(" ro=%d", bs->read_only);
|
|
term_printf(" drv=%s", bs->drv->format_name);
|
|
if (bs->encrypted)
|
|
term_printf(" encrypted");
|
|
} else {
|
|
term_printf(" [not inserted]");
|
|
}
|
|
term_printf("\n");
|
|
}
|
|
}
|
|
|
|
/* The "info blockstats" command. */
|
|
void bdrv_info_stats (void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
|
|
term_printf ("%s:"
|
|
" rd_bytes=%" PRIu64
|
|
" wr_bytes=%" PRIu64
|
|
" rd_operations=%" PRIu64
|
|
" wr_operations=%" PRIu64
|
|
"\n",
|
|
bs->device_name,
|
|
bs->rd_bytes, bs->wr_bytes,
|
|
bs->rd_ops, bs->wr_ops);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void bdrv_get_backing_filename(BlockDriverState *bs,
|
|
char *filename, int filename_size)
|
|
{
|
|
if (!bs->backing_hd) {
|
|
pstrcpy(filename, filename_size, "");
|
|
} else {
|
|
pstrcpy(filename, filename_size, bs->backing_file);
|
|
}
|
|
}
|
|
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_write_compressed)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_get_info)
|
|
return -ENOTSUP;
|
|
memset(bdi, 0, sizeof(*bdi));
|
|
return drv->bdrv_get_info(bs, bdi);
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* handling of snapshots */
|
|
|
|
int bdrv_snapshot_create(BlockDriverState *bs,
|
|
QEMUSnapshotInfo *sn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_snapshot_create)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_snapshot_create(bs, sn_info);
|
|
}
|
|
|
|
int bdrv_snapshot_goto(BlockDriverState *bs,
|
|
const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_snapshot_goto)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
|
}
|
|
|
|
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_snapshot_delete)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
|
}
|
|
|
|
int bdrv_snapshot_list(BlockDriverState *bs,
|
|
QEMUSnapshotInfo **psn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_snapshot_list)
|
|
return -ENOTSUP;
|
|
return drv->bdrv_snapshot_list(bs, psn_info);
|
|
}
|
|
|
|
#define NB_SUFFIXES 4
|
|
|
|
char *get_human_readable_size(char *buf, int buf_size, int64_t size)
|
|
{
|
|
static const char suffixes[NB_SUFFIXES] = "KMGT";
|
|
int64_t base;
|
|
int i;
|
|
|
|
if (size <= 999) {
|
|
snprintf(buf, buf_size, "%" PRId64, size);
|
|
} else {
|
|
base = 1024;
|
|
for(i = 0; i < NB_SUFFIXES; i++) {
|
|
if (size < (10 * base)) {
|
|
snprintf(buf, buf_size, "%0.1f%c",
|
|
(double)size / base,
|
|
suffixes[i]);
|
|
break;
|
|
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
|
|
snprintf(buf, buf_size, "%" PRId64 "%c",
|
|
((size + (base >> 1)) / base),
|
|
suffixes[i]);
|
|
break;
|
|
}
|
|
base = base * 1024;
|
|
}
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
|
|
{
|
|
char buf1[128], date_buf[128], clock_buf[128];
|
|
#ifdef _WIN32
|
|
struct tm *ptm;
|
|
#else
|
|
struct tm tm;
|
|
#endif
|
|
time_t ti;
|
|
int64_t secs;
|
|
|
|
if (!sn) {
|
|
snprintf(buf, buf_size,
|
|
"%-10s%-20s%7s%20s%15s",
|
|
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
|
|
} else {
|
|
ti = sn->date_sec;
|
|
#ifdef _WIN32
|
|
ptm = localtime(&ti);
|
|
strftime(date_buf, sizeof(date_buf),
|
|
"%Y-%m-%d %H:%M:%S", ptm);
|
|
#else
|
|
localtime_r(&ti, &tm);
|
|
strftime(date_buf, sizeof(date_buf),
|
|
"%Y-%m-%d %H:%M:%S", &tm);
|
|
#endif
|
|
secs = sn->vm_clock_nsec / 1000000000;
|
|
snprintf(clock_buf, sizeof(clock_buf),
|
|
"%02d:%02d:%02d.%03d",
|
|
(int)(secs / 3600),
|
|
(int)((secs / 60) % 60),
|
|
(int)(secs % 60),
|
|
(int)((sn->vm_clock_nsec / 1000000) % 1000));
|
|
snprintf(buf, buf_size,
|
|
"%-10s%-20s%7s%20s%15s",
|
|
sn->id_str, sn->name,
|
|
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
|
date_buf,
|
|
clock_buf);
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
|
|
/**************************************************************/
|
|
/* async I/Os */
|
|
|
|
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BlockDriverAIOCB *ret;
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
|
|
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
|
|
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
memcpy(buf, bs->boot_sector_data, 512);
|
|
sector_num++;
|
|
nb_sectors--;
|
|
buf += 512;
|
|
}
|
|
|
|
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
|
|
|
|
if (ret) {
|
|
/* Update stats even though technically transfer has not happened. */
|
|
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
|
bs->rd_ops ++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BlockDriverAIOCB *ret;
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
if (bs->read_only)
|
|
return NULL;
|
|
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
memcpy(bs->boot_sector_data, buf, 512);
|
|
}
|
|
|
|
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
|
|
|
|
if (ret) {
|
|
/* Update stats even though technically transfer has not happened. */
|
|
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
|
bs->wr_ops ++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
|
{
|
|
BlockDriver *drv = acb->bs->drv;
|
|
|
|
drv->bdrv_aio_cancel(acb);
|
|
}
|
|
|
|
|
|
/**************************************************************/
|
|
/* async block device emulation */
|
|
|
|
#ifdef QEMU_IMG
|
|
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
|
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret;
|
|
ret = bdrv_read(bs, sector_num, buf, nb_sectors);
|
|
cb(opaque, ret);
|
|
return NULL;
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
|
int64_t sector_num, const uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret;
|
|
ret = bdrv_write(bs, sector_num, buf, nb_sectors);
|
|
cb(opaque, ret);
|
|
return NULL;
|
|
}
|
|
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
|
|
{
|
|
}
|
|
#else
|
|
static void bdrv_aio_bh_cb(void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb = opaque;
|
|
acb->common.cb(acb->common.opaque, acb->ret);
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
|
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
int ret;
|
|
|
|
acb = qemu_aio_get(bs, cb, opaque);
|
|
if (!acb->bh)
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
ret = bdrv_read(bs, sector_num, buf, nb_sectors);
|
|
acb->ret = ret;
|
|
qemu_bh_schedule(acb->bh);
|
|
return &acb->common;
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
|
int64_t sector_num, const uint8_t *buf, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
int ret;
|
|
|
|
acb = qemu_aio_get(bs, cb, opaque);
|
|
if (!acb->bh)
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
ret = bdrv_write(bs, sector_num, buf, nb_sectors);
|
|
acb->ret = ret;
|
|
qemu_bh_schedule(acb->bh);
|
|
return &acb->common;
|
|
}
|
|
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
|
|
{
|
|
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
|
|
qemu_bh_cancel(acb->bh);
|
|
qemu_aio_release(acb);
|
|
}
|
|
#endif /* !QEMU_IMG */
|
|
|
|
/**************************************************************/
|
|
/* sync block device emulation */
|
|
|
|
static void bdrv_rw_em_cb(void *opaque, int ret)
|
|
{
|
|
*(int *)opaque = ret;
|
|
}
|
|
|
|
#define NOT_DONE 0x7fffffff
|
|
|
|
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
int async_ret;
|
|
BlockDriverAIOCB *acb;
|
|
|
|
async_ret = NOT_DONE;
|
|
qemu_aio_wait_start();
|
|
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
|
|
bdrv_rw_em_cb, &async_ret);
|
|
if (acb == NULL) {
|
|
qemu_aio_wait_end();
|
|
return -1;
|
|
}
|
|
while (async_ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
qemu_aio_wait_end();
|
|
return async_ret;
|
|
}
|
|
|
|
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
int async_ret;
|
|
BlockDriverAIOCB *acb;
|
|
|
|
async_ret = NOT_DONE;
|
|
qemu_aio_wait_start();
|
|
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
|
|
bdrv_rw_em_cb, &async_ret);
|
|
if (acb == NULL) {
|
|
qemu_aio_wait_end();
|
|
return -1;
|
|
}
|
|
while (async_ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
qemu_aio_wait_end();
|
|
return async_ret;
|
|
}
|
|
|
|
void bdrv_init(void)
|
|
{
|
|
bdrv_register(&bdrv_raw);
|
|
bdrv_register(&bdrv_host_device);
|
|
#ifndef _WIN32
|
|
bdrv_register(&bdrv_cow);
|
|
#endif
|
|
bdrv_register(&bdrv_qcow);
|
|
bdrv_register(&bdrv_vmdk);
|
|
bdrv_register(&bdrv_cloop);
|
|
bdrv_register(&bdrv_dmg);
|
|
bdrv_register(&bdrv_bochs);
|
|
bdrv_register(&bdrv_vpc);
|
|
bdrv_register(&bdrv_vvfat);
|
|
bdrv_register(&bdrv_qcow2);
|
|
bdrv_register(&bdrv_parallels);
|
|
}
|
|
|
|
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
BlockDriver *drv;
|
|
BlockDriverAIOCB *acb;
|
|
|
|
drv = bs->drv;
|
|
if (drv->free_aiocb) {
|
|
acb = drv->free_aiocb;
|
|
drv->free_aiocb = acb->next;
|
|
} else {
|
|
acb = qemu_mallocz(drv->aiocb_size);
|
|
if (!acb)
|
|
return NULL;
|
|
}
|
|
acb->bs = bs;
|
|
acb->cb = cb;
|
|
acb->opaque = opaque;
|
|
return acb;
|
|
}
|
|
|
|
void qemu_aio_release(void *p)
|
|
{
|
|
BlockDriverAIOCB *acb = p;
|
|
BlockDriver *drv = acb->bs->drv;
|
|
acb->next = drv->free_aiocb;
|
|
drv->free_aiocb = acb;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* removable device support */
|
|
|
|
/**
|
|
* Return TRUE if the media is present
|
|
*/
|
|
int bdrv_is_inserted(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
if (!drv)
|
|
return 0;
|
|
if (!drv->bdrv_is_inserted)
|
|
return 1;
|
|
ret = drv->bdrv_is_inserted(bs);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Return TRUE if the media changed since the last call to this
|
|
* function. It is currently only used for floppy disks
|
|
*/
|
|
int bdrv_media_changed(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
|
|
if (!drv || !drv->bdrv_media_changed)
|
|
ret = -ENOTSUP;
|
|
else
|
|
ret = drv->bdrv_media_changed(bs);
|
|
if (ret == -ENOTSUP)
|
|
ret = bs->media_changed;
|
|
bs->media_changed = 0;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
|
*/
|
|
void bdrv_eject(BlockDriverState *bs, int eject_flag)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
|
|
if (!drv || !drv->bdrv_eject) {
|
|
ret = -ENOTSUP;
|
|
} else {
|
|
ret = drv->bdrv_eject(bs, eject_flag);
|
|
}
|
|
if (ret == -ENOTSUP) {
|
|
if (eject_flag)
|
|
bdrv_close(bs);
|
|
}
|
|
}
|
|
|
|
int bdrv_is_locked(BlockDriverState *bs)
|
|
{
|
|
return bs->locked;
|
|
}
|
|
|
|
/**
|
|
* Lock or unlock the media (if it is locked, the user won't be able
|
|
* to eject it manually).
|
|
*/
|
|
void bdrv_set_locked(BlockDriverState *bs, int locked)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
bs->locked = locked;
|
|
if (drv && drv->bdrv_set_locked) {
|
|
drv->bdrv_set_locked(bs, locked);
|
|
}
|
|
}
|
|
|
|
/* needed for generic scsi interface */
|
|
|
|
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_ioctl)
|
|
return drv->bdrv_ioctl(bs, req, buf);
|
|
return -ENOTSUP;
|
|
}
|