d220894e02
Block drivers that don't support creating images don't have a size option. Fail gracefully instead of segfaulting when trying to access the option's value. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
3021 lines
81 KiB
C
3021 lines
81 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 "config-host.h"
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#include "qemu-common.h"
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#include "trace.h"
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#include "monitor.h"
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#include "block_int.h"
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#include "module.h"
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#include "qemu-objects.h"
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#ifdef CONFIG_BSD
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/queue.h>
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#ifndef __DragonFly__
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#include <sys/disk.h>
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#endif
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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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);
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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QTAILQ_HEAD_INITIALIZER(bdrv_states);
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static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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QLIST_HEAD_INITIALIZER(bdrv_drivers);
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/* The device to use for VM snapshots */
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static BlockDriverState *bs_snapshots;
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/* If non-zero, use only whitelisted block drivers */
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static int use_bdrv_whitelist;
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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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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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/* check if the path starts with "<protocol>:" */
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static int path_has_protocol(const char *path)
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{
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#ifdef _WIN32
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if (is_windows_drive(path) ||
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is_windows_drive_prefix(path)) {
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return 0;
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}
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#endif
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return strchr(path, ':') != NULL;
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}
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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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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;
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} else if (!bdrv->bdrv_read) {
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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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if (!bdrv->bdrv_aio_flush)
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
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QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
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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 *bs;
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bs = qemu_mallocz(sizeof(BlockDriverState));
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pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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if (device_name[0] != '\0') {
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QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
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}
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return bs;
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}
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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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QLIST_FOREACH(drv1, &bdrv_drivers, list) {
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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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}
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return NULL;
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}
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static int bdrv_is_whitelisted(BlockDriver *drv)
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{
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static const char *whitelist[] = {
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CONFIG_BDRV_WHITELIST
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};
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const char **p;
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if (!whitelist[0])
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return 1; /* no whitelist, anything goes */
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for (p = whitelist; *p; p++) {
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if (!strcmp(drv->format_name, *p)) {
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return 1;
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}
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}
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return 0;
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}
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
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{
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BlockDriver *drv = bdrv_find_format(format_name);
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return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
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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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return drv->bdrv_create(filename, options);
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}
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
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{
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BlockDriver *drv;
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drv = bdrv_find_protocol(filename);
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if (drv == NULL) {
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return -ENOENT;
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}
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return bdrv_create(drv, filename, options);
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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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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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* 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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QLIST_FOREACH(d, &bdrv_drivers, list) {
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if (d->bdrv_probe_device) {
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score = d->bdrv_probe_device(filename);
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if (score > score_max) {
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score_max = score;
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drv = d;
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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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BlockDriver *bdrv_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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/* TODO Drivers without bdrv_file_open must be specified explicitly */
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/*
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* XXX(hch): we really should not let host device detection
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* override an explicit protocol specification, but moving this
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* later breaks access to device names with colons in them.
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* Thanks to the brain-dead persistent naming schemes on udev-
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* based Linux systems those actually are quite common.
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*/
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drv1 = find_hdev_driver(filename);
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if (drv1) {
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return drv1;
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}
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if (!path_has_protocol(filename)) {
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return bdrv_find_format("file");
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}
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p = strchr(filename, ':');
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assert(p != NULL);
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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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QLIST_FOREACH(drv1, &bdrv_drivers, list) {
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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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}
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return NULL;
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}
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static int find_image_format(const char *filename, BlockDriver **pdrv)
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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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ret = bdrv_file_open(&bs, filename, 0);
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if (ret < 0) {
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*pdrv = NULL;
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return ret;
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}
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/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
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if (bs->sg || !bdrv_is_inserted(bs)) {
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bdrv_delete(bs);
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drv = bdrv_find_format("raw");
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if (!drv) {
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ret = -ENOENT;
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}
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*pdrv = drv;
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return ret;
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}
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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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*pdrv = NULL;
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return ret;
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}
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score_max = 0;
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drv = NULL;
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QLIST_FOREACH(drv1, &bdrv_drivers, list) {
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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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if (!drv) {
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ret = -ENOENT;
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}
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*pdrv = drv;
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return ret;
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}
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/**
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* Set the current 'total_sectors' value
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*/
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static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
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{
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BlockDriver *drv = bs->drv;
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/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
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if (bs->sg)
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return 0;
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/* query actual device if possible, otherwise just trust the hint */
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if (drv->bdrv_getlength) {
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int64_t length = drv->bdrv_getlength(bs);
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if (length < 0) {
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return length;
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}
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hint = length >> BDRV_SECTOR_BITS;
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}
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bs->total_sectors = hint;
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return 0;
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}
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|
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/*
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* Common part for opening disk images and files
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*/
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static int bdrv_open_common(BlockDriverState *bs, const char *filename,
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int flags, BlockDriver *drv)
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{
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int ret, open_flags;
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assert(drv != NULL);
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bs->file = NULL;
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bs->total_sectors = 0;
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bs->encrypted = 0;
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bs->valid_key = 0;
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bs->open_flags = flags;
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/* buffer_alignment defaulted to 512, drivers can change this value */
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bs->buffer_alignment = 512;
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pstrcpy(bs->filename, sizeof(bs->filename), filename);
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if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
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return -ENOTSUP;
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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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|
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if (flags & BDRV_O_CACHE_WB)
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bs->enable_write_cache = 1;
|
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|
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/*
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* Clear flags that are internal to the block layer before opening the
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* image.
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*/
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open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
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|
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/*
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* Snapshots should be writable.
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*/
|
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if (bs->is_temporary) {
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open_flags |= BDRV_O_RDWR;
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}
|
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|
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/* Open the image, either directly or using a protocol */
|
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if (drv->bdrv_file_open) {
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ret = drv->bdrv_file_open(bs, filename, open_flags);
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} else {
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ret = bdrv_file_open(&bs->file, filename, open_flags);
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if (ret >= 0) {
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ret = drv->bdrv_open(bs, open_flags);
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}
|
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}
|
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|
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if (ret < 0) {
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goto free_and_fail;
|
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}
|
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|
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bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
|
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|
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ret = refresh_total_sectors(bs, bs->total_sectors);
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if (ret < 0) {
|
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goto free_and_fail;
|
|
}
|
|
|
|
#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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return 0;
|
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|
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free_and_fail:
|
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if (bs->file) {
|
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bdrv_delete(bs->file);
|
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bs->file = NULL;
|
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}
|
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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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* Opens a file using a protocol (file, host_device, nbd, ...)
|
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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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BlockDriver *drv;
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int ret;
|
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|
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drv = bdrv_find_protocol(filename);
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if (!drv) {
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return -ENOENT;
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}
|
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|
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bs = bdrv_new("");
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ret = bdrv_open_common(bs, filename, flags, drv);
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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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bs->growable = 1;
|
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*pbs = bs;
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return 0;
|
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}
|
|
|
|
/*
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* Opens a disk image (raw, qcow2, vmdk, ...)
|
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*/
|
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int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
|
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BlockDriver *drv)
|
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{
|
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int ret;
|
|
|
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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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int is_protocol = 0;
|
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BlockDriver *bdrv_qcow2;
|
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QEMUOptionParameter *options;
|
|
char tmp_filename[PATH_MAX];
|
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char backing_filename[PATH_MAX];
|
|
|
|
/* if snapshot, we create a temporary backing file and open it
|
|
instead of opening 'filename' directly */
|
|
|
|
/* if there is a backing file, use it */
|
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bs1 = bdrv_new("");
|
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ret = bdrv_open(bs1, filename, 0, drv);
|
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if (ret < 0) {
|
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bdrv_delete(bs1);
|
|
return ret;
|
|
}
|
|
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
|
|
|
|
if (bs1->drv && bs1->drv->protocol_name)
|
|
is_protocol = 1;
|
|
|
|
bdrv_delete(bs1);
|
|
|
|
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
|
|
|
/* Real path is meaningless for protocols */
|
|
if (is_protocol)
|
|
snprintf(backing_filename, sizeof(backing_filename),
|
|
"%s", filename);
|
|
else if (!realpath(filename, backing_filename))
|
|
return -errno;
|
|
|
|
bdrv_qcow2 = bdrv_find_format("qcow2");
|
|
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
|
|
|
|
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
|
|
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
|
|
if (drv) {
|
|
set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
|
|
drv->format_name);
|
|
}
|
|
|
|
ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
|
|
free_option_parameters(options);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
filename = tmp_filename;
|
|
drv = bdrv_qcow2;
|
|
bs->is_temporary = 1;
|
|
}
|
|
|
|
/* Find the right image format driver */
|
|
if (!drv) {
|
|
ret = find_image_format(filename, &drv);
|
|
}
|
|
|
|
if (!drv) {
|
|
goto unlink_and_fail;
|
|
}
|
|
|
|
/* Open the image */
|
|
ret = bdrv_open_common(bs, filename, flags, drv);
|
|
if (ret < 0) {
|
|
goto unlink_and_fail;
|
|
}
|
|
|
|
/* If there is a backing file, use it */
|
|
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
|
|
char backing_filename[PATH_MAX];
|
|
int back_flags;
|
|
BlockDriver *back_drv = NULL;
|
|
|
|
bs->backing_hd = bdrv_new("");
|
|
|
|
if (path_has_protocol(bs->backing_file)) {
|
|
pstrcpy(backing_filename, sizeof(backing_filename),
|
|
bs->backing_file);
|
|
} else {
|
|
path_combine(backing_filename, sizeof(backing_filename),
|
|
filename, bs->backing_file);
|
|
}
|
|
|
|
if (bs->backing_format[0] != '\0') {
|
|
back_drv = bdrv_find_format(bs->backing_format);
|
|
}
|
|
|
|
/* backing files always opened read-only */
|
|
back_flags =
|
|
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
|
|
|
|
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
|
|
if (ret < 0) {
|
|
bdrv_close(bs);
|
|
return ret;
|
|
}
|
|
if (bs->is_temporary) {
|
|
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
|
|
} else {
|
|
/* base image inherits from "parent" */
|
|
bs->backing_hd->keep_read_only = bs->keep_read_only;
|
|
}
|
|
}
|
|
|
|
if (!bdrv_key_required(bs)) {
|
|
/* call the change callback */
|
|
bs->media_changed = 1;
|
|
if (bs->change_cb)
|
|
bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
|
|
}
|
|
|
|
return 0;
|
|
|
|
unlink_and_fail:
|
|
if (bs->is_temporary) {
|
|
unlink(filename);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void bdrv_close(BlockDriverState *bs)
|
|
{
|
|
if (bs->drv) {
|
|
if (bs == bs_snapshots) {
|
|
bs_snapshots = NULL;
|
|
}
|
|
if (bs->backing_hd) {
|
|
bdrv_delete(bs->backing_hd);
|
|
bs->backing_hd = NULL;
|
|
}
|
|
bs->drv->bdrv_close(bs);
|
|
qemu_free(bs->opaque);
|
|
#ifdef _WIN32
|
|
if (bs->is_temporary) {
|
|
unlink(bs->filename);
|
|
}
|
|
#endif
|
|
bs->opaque = NULL;
|
|
bs->drv = NULL;
|
|
|
|
if (bs->file != NULL) {
|
|
bdrv_close(bs->file);
|
|
}
|
|
|
|
/* call the change callback */
|
|
bs->media_changed = 1;
|
|
if (bs->change_cb)
|
|
bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
|
|
}
|
|
}
|
|
|
|
void bdrv_close_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bdrv_close(bs);
|
|
}
|
|
}
|
|
|
|
/* make a BlockDriverState anonymous by removing from bdrv_state list.
|
|
Also, NULL terminate the device_name to prevent double remove */
|
|
void bdrv_make_anon(BlockDriverState *bs)
|
|
{
|
|
if (bs->device_name[0] != '\0') {
|
|
QTAILQ_REMOVE(&bdrv_states, bs, list);
|
|
}
|
|
bs->device_name[0] = '\0';
|
|
}
|
|
|
|
void bdrv_delete(BlockDriverState *bs)
|
|
{
|
|
assert(!bs->peer);
|
|
|
|
/* remove from list, if necessary */
|
|
bdrv_make_anon(bs);
|
|
|
|
bdrv_close(bs);
|
|
if (bs->file != NULL) {
|
|
bdrv_delete(bs->file);
|
|
}
|
|
|
|
assert(bs != bs_snapshots);
|
|
qemu_free(bs);
|
|
}
|
|
|
|
int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
|
|
{
|
|
if (bs->peer) {
|
|
return -EBUSY;
|
|
}
|
|
bs->peer = qdev;
|
|
return 0;
|
|
}
|
|
|
|
void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
|
|
{
|
|
assert(bs->peer == qdev);
|
|
bs->peer = NULL;
|
|
}
|
|
|
|
DeviceState *bdrv_get_attached(BlockDriverState *bs)
|
|
{
|
|
return bs->peer;
|
|
}
|
|
|
|
/*
|
|
* Run consistency checks on an image
|
|
*
|
|
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
|
* free of errors) or -errno when an internal error occurred. The results of the
|
|
* check are stored in res.
|
|
*/
|
|
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
|
|
{
|
|
if (bs->drv->bdrv_check == NULL) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
memset(res, 0, sizeof(*res));
|
|
return bs->drv->bdrv_check(bs, res);
|
|
}
|
|
|
|
#define COMMIT_BUF_SECTORS 2048
|
|
|
|
/* commit COW file into the raw image */
|
|
int bdrv_commit(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BlockDriver *backing_drv;
|
|
int64_t sector, total_sectors;
|
|
int n, ro, open_flags;
|
|
int ret = 0, rw_ret = 0;
|
|
uint8_t *buf;
|
|
char filename[1024];
|
|
BlockDriverState *bs_rw, *bs_ro;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
|
|
if (!bs->backing_hd) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (bs->backing_hd->keep_read_only) {
|
|
return -EACCES;
|
|
}
|
|
|
|
backing_drv = bs->backing_hd->drv;
|
|
ro = bs->backing_hd->read_only;
|
|
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
|
open_flags = bs->backing_hd->open_flags;
|
|
|
|
if (ro) {
|
|
/* re-open as RW */
|
|
bdrv_delete(bs->backing_hd);
|
|
bs->backing_hd = NULL;
|
|
bs_rw = bdrv_new("");
|
|
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
|
|
backing_drv);
|
|
if (rw_ret < 0) {
|
|
bdrv_delete(bs_rw);
|
|
/* try to re-open read-only */
|
|
bs_ro = bdrv_new("");
|
|
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
|
|
backing_drv);
|
|
if (ret < 0) {
|
|
bdrv_delete(bs_ro);
|
|
/* drive not functional anymore */
|
|
bs->drv = NULL;
|
|
return ret;
|
|
}
|
|
bs->backing_hd = bs_ro;
|
|
return rw_ret;
|
|
}
|
|
bs->backing_hd = bs_rw;
|
|
}
|
|
|
|
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
|
|
buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
|
|
|
|
for (sector = 0; sector < total_sectors; sector += n) {
|
|
if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
|
|
|
if (bdrv_read(bs, sector, buf, n) != 0) {
|
|
ret = -EIO;
|
|
goto ro_cleanup;
|
|
}
|
|
|
|
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
|
|
ret = -EIO;
|
|
goto ro_cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (drv->bdrv_make_empty) {
|
|
ret = drv->bdrv_make_empty(bs);
|
|
bdrv_flush(bs);
|
|
}
|
|
|
|
/*
|
|
* Make sure all data we wrote to the backing device is actually
|
|
* stable on disk.
|
|
*/
|
|
if (bs->backing_hd)
|
|
bdrv_flush(bs->backing_hd);
|
|
|
|
ro_cleanup:
|
|
qemu_free(buf);
|
|
|
|
if (ro) {
|
|
/* re-open as RO */
|
|
bdrv_delete(bs->backing_hd);
|
|
bs->backing_hd = NULL;
|
|
bs_ro = bdrv_new("");
|
|
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
|
|
backing_drv);
|
|
if (ret < 0) {
|
|
bdrv_delete(bs_ro);
|
|
/* drive not functional anymore */
|
|
bs->drv = NULL;
|
|
return ret;
|
|
}
|
|
bs->backing_hd = bs_ro;
|
|
bs->backing_hd->keep_read_only = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void bdrv_commit_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bdrv_commit(bs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return values:
|
|
* 0 - success
|
|
* -EINVAL - backing format specified, but no file
|
|
* -ENOSPC - can't update the backing file because no space is left in the
|
|
* image file header
|
|
* -ENOTSUP - format driver doesn't support changing the backing file
|
|
*/
|
|
int bdrv_change_backing_file(BlockDriverState *bs,
|
|
const char *backing_file, const char *backing_fmt)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv->bdrv_change_backing_file != NULL) {
|
|
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
|
} else {
|
|
return -ENOTSUP;
|
|
}
|
|
}
|
|
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
|
|
size_t size)
|
|
{
|
|
int64_t len;
|
|
|
|
if (!bdrv_is_inserted(bs))
|
|
return -ENOMEDIUM;
|
|
|
|
if (bs->growable)
|
|
return 0;
|
|
|
|
len = bdrv_getlength(bs);
|
|
|
|
if (offset < 0)
|
|
return -EIO;
|
|
|
|
if ((offset > len) || (len - offset < size))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors)
|
|
{
|
|
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
|
nb_sectors * BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
/* 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 (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return -EIO;
|
|
|
|
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, int dirty)
|
|
{
|
|
int64_t start, end;
|
|
unsigned long val, idx, bit;
|
|
|
|
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
|
|
for (; start <= end; start++) {
|
|
idx = start / (sizeof(unsigned long) * 8);
|
|
bit = start % (sizeof(unsigned long) * 8);
|
|
val = bs->dirty_bitmap[idx];
|
|
if (dirty) {
|
|
if (!(val & (1UL << bit))) {
|
|
bs->dirty_count++;
|
|
val |= 1UL << bit;
|
|
}
|
|
} else {
|
|
if (val & (1UL << bit)) {
|
|
bs->dirty_count--;
|
|
val &= ~(1UL << bit);
|
|
}
|
|
}
|
|
bs->dirty_bitmap[idx] = val;
|
|
}
|
|
}
|
|
|
|
/* 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 (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return -EIO;
|
|
|
|
if (bs->dirty_bitmap) {
|
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
|
}
|
|
|
|
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
|
|
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
|
}
|
|
|
|
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
|
void *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
int ret;
|
|
|
|
count = count1;
|
|
/* first read to align to sector start */
|
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> BDRV_SECTOR_BITS;
|
|
if (len > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* read the sectors "in place" */
|
|
nb_sectors = count >> BDRV_SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
|
|
return ret;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << BDRV_SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(buf, tmp_buf, count);
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
|
const void *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
int ret;
|
|
|
|
count = count1;
|
|
/* first write to align to sector start */
|
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> BDRV_SECTOR_BITS;
|
|
if (len > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
|
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* write the sectors "in place" */
|
|
nb_sectors = count >> BDRV_SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
|
|
return ret;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << BDRV_SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(tmp_buf, buf, count);
|
|
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
/*
|
|
* Writes to the file and ensures that no writes are reordered across this
|
|
* request (acts as a barrier)
|
|
*
|
|
* Returns 0 on success, -errno in error cases.
|
|
*/
|
|
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
|
const void *buf, int count)
|
|
{
|
|
int ret;
|
|
|
|
ret = bdrv_pwrite(bs, offset, buf, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* No flush needed for cache=writethrough, it uses O_DSYNC */
|
|
if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
|
|
bdrv_flush(bs);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Writes to the file and ensures that no writes are reordered across this
|
|
* request (acts as a barrier)
|
|
*
|
|
* Returns 0 on success, -errno in error cases.
|
|
*/
|
|
int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
|
|
buf, BDRV_SECTOR_SIZE * nb_sectors);
|
|
}
|
|
|
|
/**
|
|
* Truncate file to 'offset' bytes (needed only for file protocols)
|
|
*/
|
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_truncate)
|
|
return -ENOTSUP;
|
|
if (bs->read_only)
|
|
return -EACCES;
|
|
if (bdrv_in_use(bs))
|
|
return -EBUSY;
|
|
ret = drv->bdrv_truncate(bs, offset);
|
|
if (ret == 0) {
|
|
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
|
|
if (bs->change_cb) {
|
|
bs->change_cb(bs->change_opaque, CHANGE_SIZE);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 (bs->growable || bs->removable) {
|
|
if (drv->bdrv_getlength) {
|
|
return drv->bdrv_getlength(bs);
|
|
}
|
|
}
|
|
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
|
}
|
|
|
|
/* 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 >> BDRV_SECTOR_BITS;
|
|
*nb_sectors_ptr = length;
|
|
}
|
|
|
|
struct partition {
|
|
uint8_t boot_ind; /* 0x80 - active */
|
|
uint8_t head; /* starting head */
|
|
uint8_t sector; /* starting sector */
|
|
uint8_t cyl; /* starting cylinder */
|
|
uint8_t sys_ind; /* What partition type */
|
|
uint8_t end_head; /* end head */
|
|
uint8_t end_sector; /* end sector */
|
|
uint8_t end_cyl; /* end cylinder */
|
|
uint32_t start_sect; /* starting sector counting from 0 */
|
|
uint32_t nr_sects; /* nr of sectors in partition */
|
|
} __attribute__((packed));
|
|
|
|
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
|
static int guess_disk_lchs(BlockDriverState *bs,
|
|
int *pcylinders, int *pheads, int *psectors)
|
|
{
|
|
uint8_t buf[BDRV_SECTOR_SIZE];
|
|
int ret, i, heads, sectors, cylinders;
|
|
struct partition *p;
|
|
uint32_t nr_sects;
|
|
uint64_t nb_sectors;
|
|
|
|
bdrv_get_geometry(bs, &nb_sectors);
|
|
|
|
ret = bdrv_read(bs, 0, buf, 1);
|
|
if (ret < 0)
|
|
return -1;
|
|
/* test msdos magic */
|
|
if (buf[510] != 0x55 || buf[511] != 0xaa)
|
|
return -1;
|
|
for(i = 0; i < 4; i++) {
|
|
p = ((struct partition *)(buf + 0x1be)) + i;
|
|
nr_sects = le32_to_cpu(p->nr_sects);
|
|
if (nr_sects && p->end_head) {
|
|
/* We make the assumption that the partition terminates on
|
|
a cylinder boundary */
|
|
heads = p->end_head + 1;
|
|
sectors = p->end_sector & 63;
|
|
if (sectors == 0)
|
|
continue;
|
|
cylinders = nb_sectors / (heads * sectors);
|
|
if (cylinders < 1 || cylinders > 16383)
|
|
continue;
|
|
*pheads = heads;
|
|
*psectors = sectors;
|
|
*pcylinders = cylinders;
|
|
#if 0
|
|
printf("guessed geometry: LCHS=%d %d %d\n",
|
|
cylinders, heads, sectors);
|
|
#endif
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
|
|
{
|
|
int translation, lba_detected = 0;
|
|
int cylinders, heads, secs;
|
|
uint64_t nb_sectors;
|
|
|
|
/* if a geometry hint is available, use it */
|
|
bdrv_get_geometry(bs, &nb_sectors);
|
|
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
|
|
translation = bdrv_get_translation_hint(bs);
|
|
if (cylinders != 0) {
|
|
*pcyls = cylinders;
|
|
*pheads = heads;
|
|
*psecs = secs;
|
|
} else {
|
|
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
|
|
if (heads > 16) {
|
|
/* if heads > 16, it means that a BIOS LBA
|
|
translation was active, so the default
|
|
hardware geometry is OK */
|
|
lba_detected = 1;
|
|
goto default_geometry;
|
|
} else {
|
|
*pcyls = cylinders;
|
|
*pheads = heads;
|
|
*psecs = secs;
|
|
/* disable any translation to be in sync with
|
|
the logical geometry */
|
|
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
|
bdrv_set_translation_hint(bs,
|
|
BIOS_ATA_TRANSLATION_NONE);
|
|
}
|
|
}
|
|
} else {
|
|
default_geometry:
|
|
/* if no geometry, use a standard physical disk geometry */
|
|
cylinders = nb_sectors / (16 * 63);
|
|
|
|
if (cylinders > 16383)
|
|
cylinders = 16383;
|
|
else if (cylinders < 2)
|
|
cylinders = 2;
|
|
*pcyls = cylinders;
|
|
*pheads = 16;
|
|
*psecs = 63;
|
|
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
|
|
if ((*pcyls * *pheads) <= 131072) {
|
|
bdrv_set_translation_hint(bs,
|
|
BIOS_ATA_TRANSLATION_LARGE);
|
|
} else {
|
|
bdrv_set_translation_hint(bs,
|
|
BIOS_ATA_TRANSLATION_LBA);
|
|
}
|
|
}
|
|
}
|
|
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
|
|
}
|
|
}
|
|
|
|
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_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;
|
|
}
|
|
|
|
/* Recognize floppy formats */
|
|
typedef struct FDFormat {
|
|
FDriveType drive;
|
|
uint8_t last_sect;
|
|
uint8_t max_track;
|
|
uint8_t max_head;
|
|
} FDFormat;
|
|
|
|
static const FDFormat fd_formats[] = {
|
|
/* First entry is default format */
|
|
/* 1.44 MB 3"1/2 floppy disks */
|
|
{ FDRIVE_DRV_144, 18, 80, 1, },
|
|
{ FDRIVE_DRV_144, 20, 80, 1, },
|
|
{ FDRIVE_DRV_144, 21, 80, 1, },
|
|
{ FDRIVE_DRV_144, 21, 82, 1, },
|
|
{ FDRIVE_DRV_144, 21, 83, 1, },
|
|
{ FDRIVE_DRV_144, 22, 80, 1, },
|
|
{ FDRIVE_DRV_144, 23, 80, 1, },
|
|
{ FDRIVE_DRV_144, 24, 80, 1, },
|
|
/* 2.88 MB 3"1/2 floppy disks */
|
|
{ FDRIVE_DRV_288, 36, 80, 1, },
|
|
{ FDRIVE_DRV_288, 39, 80, 1, },
|
|
{ FDRIVE_DRV_288, 40, 80, 1, },
|
|
{ FDRIVE_DRV_288, 44, 80, 1, },
|
|
{ FDRIVE_DRV_288, 48, 80, 1, },
|
|
/* 720 kB 3"1/2 floppy disks */
|
|
{ FDRIVE_DRV_144, 9, 80, 1, },
|
|
{ FDRIVE_DRV_144, 10, 80, 1, },
|
|
{ FDRIVE_DRV_144, 10, 82, 1, },
|
|
{ FDRIVE_DRV_144, 10, 83, 1, },
|
|
{ FDRIVE_DRV_144, 13, 80, 1, },
|
|
{ FDRIVE_DRV_144, 14, 80, 1, },
|
|
/* 1.2 MB 5"1/4 floppy disks */
|
|
{ FDRIVE_DRV_120, 15, 80, 1, },
|
|
{ FDRIVE_DRV_120, 18, 80, 1, },
|
|
{ FDRIVE_DRV_120, 18, 82, 1, },
|
|
{ FDRIVE_DRV_120, 18, 83, 1, },
|
|
{ FDRIVE_DRV_120, 20, 80, 1, },
|
|
/* 720 kB 5"1/4 floppy disks */
|
|
{ FDRIVE_DRV_120, 9, 80, 1, },
|
|
{ FDRIVE_DRV_120, 11, 80, 1, },
|
|
/* 360 kB 5"1/4 floppy disks */
|
|
{ FDRIVE_DRV_120, 9, 40, 1, },
|
|
{ FDRIVE_DRV_120, 9, 40, 0, },
|
|
{ FDRIVE_DRV_120, 10, 41, 1, },
|
|
{ FDRIVE_DRV_120, 10, 42, 1, },
|
|
/* 320 kB 5"1/4 floppy disks */
|
|
{ FDRIVE_DRV_120, 8, 40, 1, },
|
|
{ FDRIVE_DRV_120, 8, 40, 0, },
|
|
/* 360 kB must match 5"1/4 better than 3"1/2... */
|
|
{ FDRIVE_DRV_144, 9, 80, 0, },
|
|
/* end */
|
|
{ FDRIVE_DRV_NONE, -1, -1, 0, },
|
|
};
|
|
|
|
void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
|
|
int *max_track, int *last_sect,
|
|
FDriveType drive_in, FDriveType *drive)
|
|
{
|
|
const FDFormat *parse;
|
|
uint64_t nb_sectors, size;
|
|
int i, first_match, match;
|
|
|
|
bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect);
|
|
if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) {
|
|
/* User defined disk */
|
|
} else {
|
|
bdrv_get_geometry(bs, &nb_sectors);
|
|
match = -1;
|
|
first_match = -1;
|
|
for (i = 0; ; i++) {
|
|
parse = &fd_formats[i];
|
|
if (parse->drive == FDRIVE_DRV_NONE) {
|
|
break;
|
|
}
|
|
if (drive_in == parse->drive ||
|
|
drive_in == FDRIVE_DRV_NONE) {
|
|
size = (parse->max_head + 1) * parse->max_track *
|
|
parse->last_sect;
|
|
if (nb_sectors == size) {
|
|
match = i;
|
|
break;
|
|
}
|
|
if (first_match == -1) {
|
|
first_match = i;
|
|
}
|
|
}
|
|
}
|
|
if (match == -1) {
|
|
if (first_match == -1) {
|
|
match = 1;
|
|
} else {
|
|
match = first_match;
|
|
}
|
|
parse = &fd_formats[match];
|
|
}
|
|
*nb_heads = parse->max_head + 1;
|
|
*max_track = parse->max_track;
|
|
*last_sect = parse->last_sect;
|
|
*drive = parse->drive;
|
|
}
|
|
}
|
|
|
|
int bdrv_get_translation_hint(BlockDriverState *bs)
|
|
{
|
|
return bs->translation;
|
|
}
|
|
|
|
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
|
|
BlockErrorAction on_write_error)
|
|
{
|
|
bs->on_read_error = on_read_error;
|
|
bs->on_write_error = on_write_error;
|
|
}
|
|
|
|
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
|
|
{
|
|
return is_read ? bs->on_read_error : bs->on_write_error;
|
|
}
|
|
|
|
void bdrv_set_removable(BlockDriverState *bs, int removable)
|
|
{
|
|
bs->removable = removable;
|
|
if (removable && bs == bs_snapshots) {
|
|
bs_snapshots = NULL;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int bdrv_enable_write_cache(BlockDriverState *bs)
|
|
{
|
|
return bs->enable_write_cache;
|
|
}
|
|
|
|
/* XXX: no longer used */
|
|
void bdrv_set_change_cb(BlockDriverState *bs,
|
|
void (*change_cb)(void *opaque, int reason),
|
|
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_key_required(BlockDriverState *bs)
|
|
{
|
|
BlockDriverState *backing_hd = bs->backing_hd;
|
|
|
|
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
|
return 1;
|
|
return (bs->encrypted && !bs->valid_key);
|
|
}
|
|
|
|
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) {
|
|
return -EINVAL;
|
|
} else if (!bs->drv || !bs->drv->bdrv_set_key) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
ret = bs->drv->bdrv_set_key(bs, key);
|
|
if (ret < 0) {
|
|
bs->valid_key = 0;
|
|
} else if (!bs->valid_key) {
|
|
bs->valid_key = 1;
|
|
/* call the change callback now, we skipped it on open */
|
|
bs->media_changed = 1;
|
|
if (bs->change_cb)
|
|
bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
QLIST_FOREACH(drv, &bdrv_drivers, list) {
|
|
it(opaque, drv->format_name);
|
|
}
|
|
}
|
|
|
|
BlockDriverState *bdrv_find(const char *name)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
if (!strcmp(name, bs->device_name)) {
|
|
return bs;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
BlockDriverState *bdrv_next(BlockDriverState *bs)
|
|
{
|
|
if (!bs) {
|
|
return QTAILQ_FIRST(&bdrv_states);
|
|
}
|
|
return QTAILQ_NEXT(bs, list);
|
|
}
|
|
|
|
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
it(opaque, bs);
|
|
}
|
|
}
|
|
|
|
const char *bdrv_get_device_name(BlockDriverState *bs)
|
|
{
|
|
return bs->device_name;
|
|
}
|
|
|
|
int bdrv_flush(BlockDriverState *bs)
|
|
{
|
|
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
|
return 0;
|
|
}
|
|
|
|
if (bs->drv && bs->drv->bdrv_flush) {
|
|
return bs->drv->bdrv_flush(bs);
|
|
}
|
|
|
|
/*
|
|
* Some block drivers always operate in either writethrough or unsafe mode
|
|
* and don't support bdrv_flush therefore. Usually qemu doesn't know how
|
|
* the server works (because the behaviour is hardcoded or depends on
|
|
* server-side configuration), so we can't ensure that everything is safe
|
|
* on disk. Returning an error doesn't work because that would break guests
|
|
* even if the server operates in writethrough mode.
|
|
*
|
|
* Let's hope the user knows what he's doing.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
void bdrv_flush_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
if (bs->drv && !bdrv_is_read_only(bs) &&
|
|
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
|
|
bdrv_flush(bs);
|
|
}
|
|
}
|
|
}
|
|
|
|
int bdrv_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
assert(bs->drv);
|
|
|
|
if (bs->drv->bdrv_has_zero_init) {
|
|
return bs->drv->bdrv_has_zero_init(bs);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
|
|
{
|
|
if (!bs->drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (!bs->drv->bdrv_discard) {
|
|
return 0;
|
|
}
|
|
return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
|
|
}
|
|
|
|
/*
|
|
* Returns true iff the specified sector is present in the disk image. Drivers
|
|
* not implementing the functionality are assumed to not support backing files,
|
|
* hence all their sectors are reported as allocated.
|
|
*
|
|
* 'pnum' is set to the number of sectors (including and immediately following
|
|
* the specified sector) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
* 'nb_sectors' is the max value 'pnum' should be set to.
|
|
*/
|
|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
|
int *pnum)
|
|
{
|
|
int64_t n;
|
|
if (!bs->drv->bdrv_is_allocated) {
|
|
if (sector_num >= bs->total_sectors) {
|
|
*pnum = 0;
|
|
return 0;
|
|
}
|
|
n = bs->total_sectors - sector_num;
|
|
*pnum = (n < nb_sectors) ? (n) : (nb_sectors);
|
|
return 1;
|
|
}
|
|
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
|
}
|
|
|
|
void bdrv_mon_event(const BlockDriverState *bdrv,
|
|
BlockMonEventAction action, int is_read)
|
|
{
|
|
QObject *data;
|
|
const char *action_str;
|
|
|
|
switch (action) {
|
|
case BDRV_ACTION_REPORT:
|
|
action_str = "report";
|
|
break;
|
|
case BDRV_ACTION_IGNORE:
|
|
action_str = "ignore";
|
|
break;
|
|
case BDRV_ACTION_STOP:
|
|
action_str = "stop";
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
|
bdrv->device_name,
|
|
action_str,
|
|
is_read ? "read" : "write");
|
|
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
|
|
|
|
qobject_decref(data);
|
|
}
|
|
|
|
static void bdrv_print_dict(QObject *obj, void *opaque)
|
|
{
|
|
QDict *bs_dict;
|
|
Monitor *mon = opaque;
|
|
|
|
bs_dict = qobject_to_qdict(obj);
|
|
|
|
monitor_printf(mon, "%s: removable=%d",
|
|
qdict_get_str(bs_dict, "device"),
|
|
qdict_get_bool(bs_dict, "removable"));
|
|
|
|
if (qdict_get_bool(bs_dict, "removable")) {
|
|
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
|
|
}
|
|
|
|
if (qdict_haskey(bs_dict, "inserted")) {
|
|
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
|
|
|
monitor_printf(mon, " file=");
|
|
monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
|
if (qdict_haskey(qdict, "backing_file")) {
|
|
monitor_printf(mon, " backing_file=");
|
|
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
|
}
|
|
monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
|
qdict_get_bool(qdict, "ro"),
|
|
qdict_get_str(qdict, "drv"),
|
|
qdict_get_bool(qdict, "encrypted"));
|
|
} else {
|
|
monitor_printf(mon, " [not inserted]");
|
|
}
|
|
|
|
monitor_printf(mon, "\n");
|
|
}
|
|
|
|
void bdrv_info_print(Monitor *mon, const QObject *data)
|
|
{
|
|
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
|
|
}
|
|
|
|
void bdrv_info(Monitor *mon, QObject **ret_data)
|
|
{
|
|
QList *bs_list;
|
|
BlockDriverState *bs;
|
|
|
|
bs_list = qlist_new();
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
QObject *bs_obj;
|
|
|
|
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', "
|
|
"'removable': %i, 'locked': %i }",
|
|
bs->device_name, bs->removable,
|
|
bs->locked);
|
|
|
|
if (bs->drv) {
|
|
QObject *obj;
|
|
QDict *bs_dict = qobject_to_qdict(bs_obj);
|
|
|
|
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
|
"'encrypted': %i }",
|
|
bs->filename, bs->read_only,
|
|
bs->drv->format_name,
|
|
bdrv_is_encrypted(bs));
|
|
if (bs->backing_file[0] != '\0') {
|
|
QDict *qdict = qobject_to_qdict(obj);
|
|
qdict_put(qdict, "backing_file",
|
|
qstring_from_str(bs->backing_file));
|
|
}
|
|
|
|
qdict_put_obj(bs_dict, "inserted", obj);
|
|
}
|
|
qlist_append_obj(bs_list, bs_obj);
|
|
}
|
|
|
|
*ret_data = QOBJECT(bs_list);
|
|
}
|
|
|
|
static void bdrv_stats_iter(QObject *data, void *opaque)
|
|
{
|
|
QDict *qdict;
|
|
Monitor *mon = opaque;
|
|
|
|
qdict = qobject_to_qdict(data);
|
|
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
|
|
|
|
qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
|
monitor_printf(mon, " rd_bytes=%" PRId64
|
|
" wr_bytes=%" PRId64
|
|
" rd_operations=%" PRId64
|
|
" wr_operations=%" PRId64
|
|
"\n",
|
|
qdict_get_int(qdict, "rd_bytes"),
|
|
qdict_get_int(qdict, "wr_bytes"),
|
|
qdict_get_int(qdict, "rd_operations"),
|
|
qdict_get_int(qdict, "wr_operations"));
|
|
}
|
|
|
|
void bdrv_stats_print(Monitor *mon, const QObject *data)
|
|
{
|
|
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
|
|
}
|
|
|
|
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
|
|
{
|
|
QObject *res;
|
|
QDict *dict;
|
|
|
|
res = qobject_from_jsonf("{ 'stats': {"
|
|
"'rd_bytes': %" PRId64 ","
|
|
"'wr_bytes': %" PRId64 ","
|
|
"'rd_operations': %" PRId64 ","
|
|
"'wr_operations': %" PRId64 ","
|
|
"'wr_highest_offset': %" PRId64
|
|
"} }",
|
|
bs->rd_bytes, bs->wr_bytes,
|
|
bs->rd_ops, bs->wr_ops,
|
|
bs->wr_highest_sector *
|
|
(uint64_t)BDRV_SECTOR_SIZE);
|
|
dict = qobject_to_qdict(res);
|
|
|
|
if (*bs->device_name) {
|
|
qdict_put(dict, "device", qstring_from_str(bs->device_name));
|
|
}
|
|
|
|
if (bs->file) {
|
|
QObject *parent = bdrv_info_stats_bs(bs->file);
|
|
qdict_put_obj(dict, "parent", parent);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
|
{
|
|
QObject *obj;
|
|
QList *devices;
|
|
BlockDriverState *bs;
|
|
|
|
devices = qlist_new();
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
obj = bdrv_info_stats_bs(bs);
|
|
qlist_append_obj(devices, obj);
|
|
}
|
|
|
|
*ret_data = QOBJECT(devices);
|
|
}
|
|
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
|
|
{
|
|
if (bs->backing_hd && bs->backing_hd->encrypted)
|
|
return bs->backing_file;
|
|
else if (bs->encrypted)
|
|
return bs->filename;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
void bdrv_get_backing_filename(BlockDriverState *bs,
|
|
char *filename, int filename_size)
|
|
{
|
|
if (!bs->backing_file) {
|
|
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;
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return -EIO;
|
|
|
|
if (bs->dirty_bitmap) {
|
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_save_vmstate)
|
|
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
|
if (bs->file)
|
|
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_load_vmstate)
|
|
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
|
if (bs->file)
|
|
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv || !drv->bdrv_debug_event) {
|
|
return;
|
|
}
|
|
|
|
return drv->bdrv_debug_event(bs, event);
|
|
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* handling of snapshots */
|
|
|
|
int bdrv_can_snapshot(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
|
|
return 0;
|
|
}
|
|
|
|
if (!drv->bdrv_snapshot_create) {
|
|
if (bs->file != NULL) {
|
|
return bdrv_can_snapshot(bs->file);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int bdrv_is_snapshot(BlockDriverState *bs)
|
|
{
|
|
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
|
}
|
|
|
|
BlockDriverState *bdrv_snapshots(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
if (bs_snapshots) {
|
|
return bs_snapshots;
|
|
}
|
|
|
|
bs = NULL;
|
|
while ((bs = bdrv_next(bs))) {
|
|
if (bdrv_can_snapshot(bs)) {
|
|
bs_snapshots = bs;
|
|
return bs;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int bdrv_snapshot_create(BlockDriverState *bs,
|
|
QEMUSnapshotInfo *sn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_create)
|
|
return drv->bdrv_snapshot_create(bs, sn_info);
|
|
if (bs->file)
|
|
return bdrv_snapshot_create(bs->file, sn_info);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_goto(BlockDriverState *bs,
|
|
const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret, open_ret;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_goto)
|
|
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
|
|
|
if (bs->file) {
|
|
drv->bdrv_close(bs);
|
|
ret = bdrv_snapshot_goto(bs->file, snapshot_id);
|
|
open_ret = drv->bdrv_open(bs, bs->open_flags);
|
|
if (open_ret < 0) {
|
|
bdrv_delete(bs->file);
|
|
bs->drv = NULL;
|
|
return open_ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_delete)
|
|
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
|
if (bs->file)
|
|
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_list(BlockDriverState *bs,
|
|
QEMUSnapshotInfo **psn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_list)
|
|
return drv->bdrv_snapshot_list(bs, psn_info);
|
|
if (bs->file)
|
|
return bdrv_snapshot_list(bs->file, psn_info);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
|
|
const char *snapshot_name)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (!bs->read_only) {
|
|
return -EINVAL;
|
|
}
|
|
if (drv->bdrv_snapshot_load_tmp) {
|
|
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
#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_readv(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BlockDriverAIOCB *ret;
|
|
|
|
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return NULL;
|
|
|
|
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque);
|
|
|
|
if (ret) {
|
|
/* Update stats even though technically transfer has not happened. */
|
|
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
|
bs->rd_ops ++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
typedef struct BlockCompleteData {
|
|
BlockDriverCompletionFunc *cb;
|
|
void *opaque;
|
|
BlockDriverState *bs;
|
|
int64_t sector_num;
|
|
int nb_sectors;
|
|
} BlockCompleteData;
|
|
|
|
static void block_complete_cb(void *opaque, int ret)
|
|
{
|
|
BlockCompleteData *b = opaque;
|
|
|
|
if (b->bs->dirty_bitmap) {
|
|
set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
|
|
}
|
|
b->cb(b->opaque, ret);
|
|
qemu_free(b);
|
|
}
|
|
|
|
static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
|
|
|
|
blkdata->bs = bs;
|
|
blkdata->cb = cb;
|
|
blkdata->opaque = opaque;
|
|
blkdata->sector_num = sector_num;
|
|
blkdata->nb_sectors = nb_sectors;
|
|
|
|
return blkdata;
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BlockDriverAIOCB *ret;
|
|
BlockCompleteData *blk_cb_data;
|
|
|
|
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
if (bs->read_only)
|
|
return NULL;
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return NULL;
|
|
|
|
if (bs->dirty_bitmap) {
|
|
blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
|
|
opaque);
|
|
cb = &block_complete_cb;
|
|
opaque = blk_cb_data;
|
|
}
|
|
|
|
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque);
|
|
|
|
if (ret) {
|
|
/* Update stats even though technically transfer has not happened. */
|
|
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
|
bs->wr_ops ++;
|
|
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
|
|
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
typedef struct MultiwriteCB {
|
|
int error;
|
|
int num_requests;
|
|
int num_callbacks;
|
|
struct {
|
|
BlockDriverCompletionFunc *cb;
|
|
void *opaque;
|
|
QEMUIOVector *free_qiov;
|
|
void *free_buf;
|
|
} callbacks[];
|
|
} MultiwriteCB;
|
|
|
|
static void multiwrite_user_cb(MultiwriteCB *mcb)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mcb->num_callbacks; i++) {
|
|
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
|
|
if (mcb->callbacks[i].free_qiov) {
|
|
qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
|
|
}
|
|
qemu_free(mcb->callbacks[i].free_qiov);
|
|
qemu_vfree(mcb->callbacks[i].free_buf);
|
|
}
|
|
}
|
|
|
|
static void multiwrite_cb(void *opaque, int ret)
|
|
{
|
|
MultiwriteCB *mcb = opaque;
|
|
|
|
trace_multiwrite_cb(mcb, ret);
|
|
|
|
if (ret < 0 && !mcb->error) {
|
|
mcb->error = ret;
|
|
}
|
|
|
|
mcb->num_requests--;
|
|
if (mcb->num_requests == 0) {
|
|
multiwrite_user_cb(mcb);
|
|
qemu_free(mcb);
|
|
}
|
|
}
|
|
|
|
static int multiwrite_req_compare(const void *a, const void *b)
|
|
{
|
|
const BlockRequest *req1 = a, *req2 = b;
|
|
|
|
/*
|
|
* Note that we can't simply subtract req2->sector from req1->sector
|
|
* here as that could overflow the return value.
|
|
*/
|
|
if (req1->sector > req2->sector) {
|
|
return 1;
|
|
} else if (req1->sector < req2->sector) {
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Takes a bunch of requests and tries to merge them. Returns the number of
|
|
* requests that remain after merging.
|
|
*/
|
|
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
|
|
int num_reqs, MultiwriteCB *mcb)
|
|
{
|
|
int i, outidx;
|
|
|
|
// Sort requests by start sector
|
|
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
|
|
|
// Check if adjacent requests touch the same clusters. If so, combine them,
|
|
// filling up gaps with zero sectors.
|
|
outidx = 0;
|
|
for (i = 1; i < num_reqs; i++) {
|
|
int merge = 0;
|
|
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
|
|
|
|
// This handles the cases that are valid for all block drivers, namely
|
|
// exactly sequential writes and overlapping writes.
|
|
if (reqs[i].sector <= oldreq_last) {
|
|
merge = 1;
|
|
}
|
|
|
|
// The block driver may decide that it makes sense to combine requests
|
|
// even if there is a gap of some sectors between them. In this case,
|
|
// the gap is filled with zeros (therefore only applicable for yet
|
|
// unused space in format like qcow2).
|
|
if (!merge && bs->drv->bdrv_merge_requests) {
|
|
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
|
|
}
|
|
|
|
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
|
|
merge = 0;
|
|
}
|
|
|
|
if (merge) {
|
|
size_t size;
|
|
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
|
qemu_iovec_init(qiov,
|
|
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
|
|
|
// Add the first request to the merged one. If the requests are
|
|
// overlapping, drop the last sectors of the first request.
|
|
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
|
qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
|
|
|
|
// We might need to add some zeros between the two requests
|
|
if (reqs[i].sector > oldreq_last) {
|
|
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
|
uint8_t *buf = qemu_blockalign(bs, zero_bytes);
|
|
memset(buf, 0, zero_bytes);
|
|
qemu_iovec_add(qiov, buf, zero_bytes);
|
|
mcb->callbacks[i].free_buf = buf;
|
|
}
|
|
|
|
// Add the second request
|
|
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
|
|
|
|
reqs[outidx].nb_sectors = qiov->size >> 9;
|
|
reqs[outidx].qiov = qiov;
|
|
|
|
mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
|
|
} else {
|
|
outidx++;
|
|
reqs[outidx].sector = reqs[i].sector;
|
|
reqs[outidx].nb_sectors = reqs[i].nb_sectors;
|
|
reqs[outidx].qiov = reqs[i].qiov;
|
|
}
|
|
}
|
|
|
|
return outidx + 1;
|
|
}
|
|
|
|
/*
|
|
* Submit multiple AIO write requests at once.
|
|
*
|
|
* On success, the function returns 0 and all requests in the reqs array have
|
|
* been submitted. In error case this function returns -1, and any of the
|
|
* requests may or may not be submitted yet. In particular, this means that the
|
|
* callback will be called for some of the requests, for others it won't. The
|
|
* caller must check the error field of the BlockRequest to wait for the right
|
|
* callbacks (if error != 0, no callback will be called).
|
|
*
|
|
* The implementation may modify the contents of the reqs array, e.g. to merge
|
|
* requests. However, the fields opaque and error are left unmodified as they
|
|
* are used to signal failure for a single request to the caller.
|
|
*/
|
|
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
|
|
{
|
|
BlockDriverAIOCB *acb;
|
|
MultiwriteCB *mcb;
|
|
int i;
|
|
|
|
/* don't submit writes if we don't have a medium */
|
|
if (bs->drv == NULL) {
|
|
for (i = 0; i < num_reqs; i++) {
|
|
reqs[i].error = -ENOMEDIUM;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (num_reqs == 0) {
|
|
return 0;
|
|
}
|
|
|
|
// Create MultiwriteCB structure
|
|
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
|
|
mcb->num_requests = 0;
|
|
mcb->num_callbacks = num_reqs;
|
|
|
|
for (i = 0; i < num_reqs; i++) {
|
|
mcb->callbacks[i].cb = reqs[i].cb;
|
|
mcb->callbacks[i].opaque = reqs[i].opaque;
|
|
}
|
|
|
|
// Check for mergable requests
|
|
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
|
|
|
|
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
|
|
|
|
/*
|
|
* Run the aio requests. As soon as one request can't be submitted
|
|
* successfully, fail all requests that are not yet submitted (we must
|
|
* return failure for all requests anyway)
|
|
*
|
|
* num_requests cannot be set to the right value immediately: If
|
|
* bdrv_aio_writev fails for some request, num_requests would be too high
|
|
* and therefore multiwrite_cb() would never recognize the multiwrite
|
|
* request as completed. We also cannot use the loop variable i to set it
|
|
* when the first request fails because the callback may already have been
|
|
* called for previously submitted requests. Thus, num_requests must be
|
|
* incremented for each request that is submitted.
|
|
*
|
|
* The problem that callbacks may be called early also means that we need
|
|
* to take care that num_requests doesn't become 0 before all requests are
|
|
* submitted - multiwrite_cb() would consider the multiwrite request
|
|
* completed. A dummy request that is "completed" by a manual call to
|
|
* multiwrite_cb() takes care of this.
|
|
*/
|
|
mcb->num_requests = 1;
|
|
|
|
// Run the aio requests
|
|
for (i = 0; i < num_reqs; i++) {
|
|
mcb->num_requests++;
|
|
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
|
|
reqs[i].nb_sectors, multiwrite_cb, mcb);
|
|
|
|
if (acb == NULL) {
|
|
// We can only fail the whole thing if no request has been
|
|
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
|
// complete and report the error in the callback.
|
|
if (i == 0) {
|
|
trace_bdrv_aio_multiwrite_earlyfail(mcb);
|
|
goto fail;
|
|
} else {
|
|
trace_bdrv_aio_multiwrite_latefail(mcb, i);
|
|
multiwrite_cb(mcb, -EIO);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Complete the dummy request */
|
|
multiwrite_cb(mcb, 0);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
for (i = 0; i < mcb->num_callbacks; i++) {
|
|
reqs[i].error = -EIO;
|
|
}
|
|
qemu_free(mcb);
|
|
return -1;
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
trace_bdrv_aio_flush(bs, opaque);
|
|
|
|
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
|
return bdrv_aio_noop_em(bs, cb, opaque);
|
|
}
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
return drv->bdrv_aio_flush(bs, cb, opaque);
|
|
}
|
|
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
|
{
|
|
acb->pool->cancel(acb);
|
|
}
|
|
|
|
|
|
/**************************************************************/
|
|
/* async block device emulation */
|
|
|
|
typedef struct BlockDriverAIOCBSync {
|
|
BlockDriverAIOCB common;
|
|
QEMUBH *bh;
|
|
int ret;
|
|
/* vector translation state */
|
|
QEMUIOVector *qiov;
|
|
uint8_t *bounce;
|
|
int is_write;
|
|
} BlockDriverAIOCBSync;
|
|
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
|
|
{
|
|
BlockDriverAIOCBSync *acb =
|
|
container_of(blockacb, BlockDriverAIOCBSync, common);
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static AIOPool bdrv_em_aio_pool = {
|
|
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
|
.cancel = bdrv_aio_cancel_em,
|
|
};
|
|
|
|
static void bdrv_aio_bh_cb(void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb = opaque;
|
|
|
|
if (!acb->is_write)
|
|
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
|
|
qemu_vfree(acb->bounce);
|
|
acb->common.cb(acb->common.opaque, acb->ret);
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque,
|
|
int is_write)
|
|
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
|
|
acb->is_write = is_write;
|
|
acb->qiov = qiov;
|
|
acb->bounce = qemu_blockalign(bs, qiov->size);
|
|
|
|
if (!acb->bh)
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
|
|
if (is_write) {
|
|
qemu_iovec_to_buffer(acb->qiov, acb->bounce);
|
|
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
|
|
} else {
|
|
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
|
|
}
|
|
|
|
qemu_bh_schedule(acb->bh);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
|
|
acb->is_write = 1; /* don't bounce in the completion hadler */
|
|
acb->qiov = NULL;
|
|
acb->bounce = NULL;
|
|
acb->ret = 0;
|
|
|
|
if (!acb->bh)
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
|
|
bdrv_flush(bs);
|
|
qemu_bh_schedule(acb->bh);
|
|
return &acb->common;
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
|
|
acb->is_write = 1; /* don't bounce in the completion handler */
|
|
acb->qiov = NULL;
|
|
acb->bounce = NULL;
|
|
acb->ret = 0;
|
|
|
|
if (!acb->bh) {
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
}
|
|
|
|
qemu_bh_schedule(acb->bh);
|
|
return &acb->common;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* 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;
|
|
struct iovec iov;
|
|
QEMUIOVector qiov;
|
|
|
|
async_context_push();
|
|
|
|
async_ret = NOT_DONE;
|
|
iov.iov_base = (void *)buf;
|
|
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
|
|
bdrv_rw_em_cb, &async_ret);
|
|
if (acb == NULL) {
|
|
async_ret = -1;
|
|
goto fail;
|
|
}
|
|
|
|
while (async_ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
|
|
|
|
fail:
|
|
async_context_pop();
|
|
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;
|
|
struct iovec iov;
|
|
QEMUIOVector qiov;
|
|
|
|
async_context_push();
|
|
|
|
async_ret = NOT_DONE;
|
|
iov.iov_base = (void *)buf;
|
|
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
|
|
bdrv_rw_em_cb, &async_ret);
|
|
if (acb == NULL) {
|
|
async_ret = -1;
|
|
goto fail;
|
|
}
|
|
while (async_ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
|
|
fail:
|
|
async_context_pop();
|
|
return async_ret;
|
|
}
|
|
|
|
void bdrv_init(void)
|
|
{
|
|
module_call_init(MODULE_INIT_BLOCK);
|
|
}
|
|
|
|
void bdrv_init_with_whitelist(void)
|
|
{
|
|
use_bdrv_whitelist = 1;
|
|
bdrv_init();
|
|
}
|
|
|
|
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCB *acb;
|
|
|
|
if (pool->free_aiocb) {
|
|
acb = pool->free_aiocb;
|
|
pool->free_aiocb = acb->next;
|
|
} else {
|
|
acb = qemu_mallocz(pool->aiocb_size);
|
|
acb->pool = pool;
|
|
}
|
|
acb->bs = bs;
|
|
acb->cb = cb;
|
|
acb->opaque = opaque;
|
|
return acb;
|
|
}
|
|
|
|
void qemu_aio_release(void *p)
|
|
{
|
|
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
|
|
AIOPool *pool = acb->pool;
|
|
acb->next = pool->free_aiocb;
|
|
pool->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 !bs->tray_open;
|
|
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
|
|
*/
|
|
int bdrv_eject(BlockDriverState *bs, int eject_flag)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
|
|
if (bs->locked) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!drv || !drv->bdrv_eject) {
|
|
ret = -ENOTSUP;
|
|
} else {
|
|
ret = drv->bdrv_eject(bs, eject_flag);
|
|
}
|
|
if (ret == -ENOTSUP) {
|
|
ret = 0;
|
|
}
|
|
if (ret >= 0) {
|
|
bs->tray_open = eject_flag;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
trace_bdrv_set_locked(bs, locked);
|
|
|
|
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;
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
|
|
unsigned long int req, void *buf,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_aio_ioctl)
|
|
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
|
{
|
|
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
|
|
}
|
|
|
|
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
|
|
{
|
|
int64_t bitmap_size;
|
|
|
|
bs->dirty_count = 0;
|
|
if (enable) {
|
|
if (!bs->dirty_bitmap) {
|
|
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
|
|
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
|
|
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
|
|
|
bs->dirty_bitmap = qemu_mallocz(bitmap_size);
|
|
}
|
|
} else {
|
|
if (bs->dirty_bitmap) {
|
|
qemu_free(bs->dirty_bitmap);
|
|
bs->dirty_bitmap = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
|
{
|
|
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
|
|
if (bs->dirty_bitmap &&
|
|
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
|
|
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
|
|
(1UL << (chunk % (sizeof(unsigned long) * 8))));
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
|
int nr_sectors)
|
|
{
|
|
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
|
}
|
|
|
|
int64_t bdrv_get_dirty_count(BlockDriverState *bs)
|
|
{
|
|
return bs->dirty_count;
|
|
}
|
|
|
|
void bdrv_set_in_use(BlockDriverState *bs, int in_use)
|
|
{
|
|
assert(bs->in_use != in_use);
|
|
bs->in_use = in_use;
|
|
}
|
|
|
|
int bdrv_in_use(BlockDriverState *bs)
|
|
{
|
|
return bs->in_use;
|
|
}
|
|
|
|
int bdrv_img_create(const char *filename, const char *fmt,
|
|
const char *base_filename, const char *base_fmt,
|
|
char *options, uint64_t img_size, int flags)
|
|
{
|
|
QEMUOptionParameter *param = NULL, *create_options = NULL;
|
|
QEMUOptionParameter *backing_fmt, *backing_file, *size;
|
|
BlockDriverState *bs = NULL;
|
|
BlockDriver *drv, *proto_drv;
|
|
BlockDriver *backing_drv = NULL;
|
|
int ret = 0;
|
|
|
|
/* Find driver and parse its options */
|
|
drv = bdrv_find_format(fmt);
|
|
if (!drv) {
|
|
error_report("Unknown file format '%s'", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
proto_drv = bdrv_find_protocol(filename);
|
|
if (!proto_drv) {
|
|
error_report("Unknown protocol '%s'", filename);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
create_options = append_option_parameters(create_options,
|
|
drv->create_options);
|
|
create_options = append_option_parameters(create_options,
|
|
proto_drv->create_options);
|
|
|
|
/* Create parameter list with default values */
|
|
param = parse_option_parameters("", create_options, param);
|
|
|
|
set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
|
|
|
|
/* Parse -o options */
|
|
if (options) {
|
|
param = parse_option_parameters(options, create_options, param);
|
|
if (param == NULL) {
|
|
error_report("Invalid options for file format '%s'.", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (base_filename) {
|
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
|
|
base_filename)) {
|
|
error_report("Backing file not supported for file format '%s'",
|
|
fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (base_fmt) {
|
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
|
error_report("Backing file format not supported for file "
|
|
"format '%s'", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
|
|
if (backing_file && backing_file->value.s) {
|
|
if (!strcmp(filename, backing_file->value.s)) {
|
|
error_report("Error: Trying to create an image with the "
|
|
"same filename as the backing file");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
|
|
if (backing_fmt && backing_fmt->value.s) {
|
|
backing_drv = bdrv_find_format(backing_fmt->value.s);
|
|
if (!backing_drv) {
|
|
error_report("Unknown backing file format '%s'",
|
|
backing_fmt->value.s);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
// The size for the image must always be specified, with one exception:
|
|
// If we are using a backing file, we can obtain the size from there
|
|
size = get_option_parameter(param, BLOCK_OPT_SIZE);
|
|
if (size && size->value.n == -1) {
|
|
if (backing_file && backing_file->value.s) {
|
|
uint64_t size;
|
|
char buf[32];
|
|
|
|
bs = bdrv_new("");
|
|
|
|
ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
|
|
if (ret < 0) {
|
|
error_report("Could not open '%s'", backing_file->value.s);
|
|
goto out;
|
|
}
|
|
bdrv_get_geometry(bs, &size);
|
|
size *= 512;
|
|
|
|
snprintf(buf, sizeof(buf), "%" PRId64, size);
|
|
set_option_parameter(param, BLOCK_OPT_SIZE, buf);
|
|
} else {
|
|
error_report("Image creation needs a size parameter");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
|
print_option_parameters(param);
|
|
puts("");
|
|
|
|
ret = bdrv_create(drv, filename, param);
|
|
|
|
if (ret < 0) {
|
|
if (ret == -ENOTSUP) {
|
|
error_report("Formatting or formatting option not supported for "
|
|
"file format '%s'", fmt);
|
|
} else if (ret == -EFBIG) {
|
|
error_report("The image size is too large for file format '%s'",
|
|
fmt);
|
|
} else {
|
|
error_report("%s: error while creating %s: %s", filename, fmt,
|
|
strerror(-ret));
|
|
}
|
|
}
|
|
|
|
out:
|
|
free_option_parameters(create_options);
|
|
free_option_parameters(param);
|
|
|
|
if (bs) {
|
|
bdrv_delete(bs);
|
|
}
|
|
|
|
return ret;
|
|
}
|