319ae529b8
Watch this: (qemu) drive_add 0 if=none (qemu) info block none0: type=hd removable=0 [not inserted] (qemu) drive_del none0 Segmentation fault (core dumped) add_init_drive() is confused about drive_init()'s failure modes, and cleans up when it shouldn't. This leaves the DriveInfo with member opts dangling. drive_del attempts to free it, and dies. drive_init() behaves as follows: * If it created a drive with media, it returns its DriveInfo. * If it created a drive without media, it clears *fatal_error and returns NULL. * If it couldn't create a drive, it sets *fatal_error and returns NULL. Of its three callers: * drive_init_func() is correct. * usb_msd_init() assumes drive_init() failed when it returns NULL. This is correct only because it always passes option "file", and "drive without media" can't happen then. * add_init_drive() assumes drive_init() failed when it returns NULL. This is incorrect. Clean up drive_init() to return NULL on failure and only on failure. Drop its parameter fatal_error. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
771 lines
20 KiB
C
771 lines
20 KiB
C
/*
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* QEMU host block devices
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "block.h"
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#include "blockdev.h"
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#include "monitor.h"
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#include "qerror.h"
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#include "qemu-option.h"
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#include "qemu-config.h"
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#include "sysemu.h"
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#include "hw/qdev.h"
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#include "block_int.h"
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static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
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static const char *const if_name[IF_COUNT] = {
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[IF_NONE] = "none",
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[IF_IDE] = "ide",
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[IF_SCSI] = "scsi",
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[IF_FLOPPY] = "floppy",
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[IF_PFLASH] = "pflash",
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[IF_MTD] = "mtd",
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[IF_SD] = "sd",
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[IF_VIRTIO] = "virtio",
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[IF_XEN] = "xen",
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};
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static const int if_max_devs[IF_COUNT] = {
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/*
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* Do not change these numbers! They govern how drive option
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* index maps to unit and bus. That mapping is ABI.
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*
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* All controllers used to imlement if=T drives need to support
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* if_max_devs[T] units, for any T with if_max_devs[T] != 0.
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* Otherwise, some index values map to "impossible" bus, unit
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* values.
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*
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* For instance, if you change [IF_SCSI] to 255, -drive
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* if=scsi,index=12 no longer means bus=1,unit=5, but
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* bus=0,unit=12. With an lsi53c895a controller (7 units max),
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* the drive can't be set up. Regression.
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*/
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[IF_IDE] = 2,
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[IF_SCSI] = 7,
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};
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/*
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* We automatically delete the drive when a device using it gets
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* unplugged. Questionable feature, but we can't just drop it.
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* Device models call blockdev_mark_auto_del() to schedule the
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* automatic deletion, and generic qdev code calls blockdev_auto_del()
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* when deletion is actually safe.
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*/
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void blockdev_mark_auto_del(BlockDriverState *bs)
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{
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DriveInfo *dinfo = drive_get_by_blockdev(bs);
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if (dinfo) {
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dinfo->auto_del = 1;
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}
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}
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void blockdev_auto_del(BlockDriverState *bs)
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{
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DriveInfo *dinfo = drive_get_by_blockdev(bs);
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if (dinfo && dinfo->auto_del) {
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drive_uninit(dinfo);
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}
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}
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static int drive_index_to_bus_id(BlockInterfaceType type, int index)
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{
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int max_devs = if_max_devs[type];
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return max_devs ? index / max_devs : 0;
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}
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static int drive_index_to_unit_id(BlockInterfaceType type, int index)
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{
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int max_devs = if_max_devs[type];
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return max_devs ? index % max_devs : index;
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}
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QemuOpts *drive_def(const char *optstr)
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{
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return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
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}
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QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
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const char *optstr)
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{
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QemuOpts *opts;
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char buf[32];
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opts = drive_def(optstr);
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if (!opts) {
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return NULL;
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}
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if (type != IF_DEFAULT) {
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qemu_opt_set(opts, "if", if_name[type]);
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}
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if (index >= 0) {
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snprintf(buf, sizeof(buf), "%d", index);
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qemu_opt_set(opts, "index", buf);
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}
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if (file)
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qemu_opt_set(opts, "file", file);
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return opts;
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}
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DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
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{
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DriveInfo *dinfo;
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/* seek interface, bus and unit */
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QTAILQ_FOREACH(dinfo, &drives, next) {
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if (dinfo->type == type &&
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dinfo->bus == bus &&
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dinfo->unit == unit)
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return dinfo;
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}
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return NULL;
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}
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DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
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{
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return drive_get(type,
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drive_index_to_bus_id(type, index),
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drive_index_to_unit_id(type, index));
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}
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int drive_get_max_bus(BlockInterfaceType type)
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{
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int max_bus;
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DriveInfo *dinfo;
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max_bus = -1;
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QTAILQ_FOREACH(dinfo, &drives, next) {
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if(dinfo->type == type &&
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dinfo->bus > max_bus)
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max_bus = dinfo->bus;
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}
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return max_bus;
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}
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/* Get a block device. This should only be used for single-drive devices
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(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
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appropriate bus. */
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DriveInfo *drive_get_next(BlockInterfaceType type)
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{
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static int next_block_unit[IF_COUNT];
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return drive_get(type, 0, next_block_unit[type]++);
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}
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DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
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{
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DriveInfo *dinfo;
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QTAILQ_FOREACH(dinfo, &drives, next) {
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if (dinfo->bdrv == bs) {
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return dinfo;
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}
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}
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return NULL;
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}
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static void bdrv_format_print(void *opaque, const char *name)
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{
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error_printf(" %s", name);
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}
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void drive_uninit(DriveInfo *dinfo)
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{
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qemu_opts_del(dinfo->opts);
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bdrv_delete(dinfo->bdrv);
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QTAILQ_REMOVE(&drives, dinfo, next);
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qemu_free(dinfo);
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}
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static int parse_block_error_action(const char *buf, int is_read)
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{
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if (!strcmp(buf, "ignore")) {
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return BLOCK_ERR_IGNORE;
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} else if (!is_read && !strcmp(buf, "enospc")) {
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return BLOCK_ERR_STOP_ENOSPC;
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} else if (!strcmp(buf, "stop")) {
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return BLOCK_ERR_STOP_ANY;
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} else if (!strcmp(buf, "report")) {
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return BLOCK_ERR_REPORT;
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} else {
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error_report("'%s' invalid %s error action",
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buf, is_read ? "read" : "write");
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return -1;
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}
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}
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DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
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{
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const char *buf;
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const char *file = NULL;
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char devname[128];
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const char *serial;
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const char *mediastr = "";
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BlockInterfaceType type;
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enum { MEDIA_DISK, MEDIA_CDROM } media;
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int bus_id, unit_id;
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int cyls, heads, secs, translation;
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BlockDriver *drv = NULL;
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int max_devs;
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int index;
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int ro = 0;
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int bdrv_flags = 0;
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int on_read_error, on_write_error;
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const char *devaddr;
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DriveInfo *dinfo;
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int snapshot = 0;
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int ret;
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translation = BIOS_ATA_TRANSLATION_AUTO;
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if (default_to_scsi) {
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type = IF_SCSI;
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pstrcpy(devname, sizeof(devname), "scsi");
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} else {
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type = IF_IDE;
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pstrcpy(devname, sizeof(devname), "ide");
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}
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media = MEDIA_DISK;
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/* extract parameters */
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bus_id = qemu_opt_get_number(opts, "bus", 0);
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unit_id = qemu_opt_get_number(opts, "unit", -1);
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index = qemu_opt_get_number(opts, "index", -1);
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cyls = qemu_opt_get_number(opts, "cyls", 0);
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heads = qemu_opt_get_number(opts, "heads", 0);
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secs = qemu_opt_get_number(opts, "secs", 0);
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snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
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ro = qemu_opt_get_bool(opts, "readonly", 0);
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file = qemu_opt_get(opts, "file");
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serial = qemu_opt_get(opts, "serial");
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if ((buf = qemu_opt_get(opts, "if")) != NULL) {
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pstrcpy(devname, sizeof(devname), buf);
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for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
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;
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if (type == IF_COUNT) {
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error_report("unsupported bus type '%s'", buf);
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return NULL;
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}
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}
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max_devs = if_max_devs[type];
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if (cyls || heads || secs) {
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if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
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error_report("invalid physical cyls number");
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return NULL;
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}
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if (heads < 1 || (type == IF_IDE && heads > 16)) {
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error_report("invalid physical heads number");
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return NULL;
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}
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if (secs < 1 || (type == IF_IDE && secs > 63)) {
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error_report("invalid physical secs number");
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return NULL;
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}
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}
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if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
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if (!cyls) {
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error_report("'%s' trans must be used with cyls,heads and secs",
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buf);
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return NULL;
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}
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if (!strcmp(buf, "none"))
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translation = BIOS_ATA_TRANSLATION_NONE;
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else if (!strcmp(buf, "lba"))
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translation = BIOS_ATA_TRANSLATION_LBA;
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else if (!strcmp(buf, "auto"))
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translation = BIOS_ATA_TRANSLATION_AUTO;
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else {
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error_report("'%s' invalid translation type", buf);
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return NULL;
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}
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}
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if ((buf = qemu_opt_get(opts, "media")) != NULL) {
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if (!strcmp(buf, "disk")) {
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media = MEDIA_DISK;
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} else if (!strcmp(buf, "cdrom")) {
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if (cyls || secs || heads) {
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error_report("'%s' invalid physical CHS format", buf);
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return NULL;
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}
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media = MEDIA_CDROM;
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} else {
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error_report("'%s' invalid media", buf);
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return NULL;
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}
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}
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if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
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if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
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bdrv_flags |= BDRV_O_NOCACHE;
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} else if (!strcmp(buf, "writeback")) {
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bdrv_flags |= BDRV_O_CACHE_WB;
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} else if (!strcmp(buf, "unsafe")) {
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bdrv_flags |= BDRV_O_CACHE_WB;
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bdrv_flags |= BDRV_O_NO_FLUSH;
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} else if (!strcmp(buf, "writethrough")) {
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/* this is the default */
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} else {
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error_report("invalid cache option");
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return NULL;
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}
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}
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#ifdef CONFIG_LINUX_AIO
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if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
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if (!strcmp(buf, "native")) {
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bdrv_flags |= BDRV_O_NATIVE_AIO;
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} else if (!strcmp(buf, "threads")) {
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/* this is the default */
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} else {
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error_report("invalid aio option");
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return NULL;
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}
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}
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#endif
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if ((buf = qemu_opt_get(opts, "format")) != NULL) {
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if (strcmp(buf, "?") == 0) {
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error_printf("Supported formats:");
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bdrv_iterate_format(bdrv_format_print, NULL);
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error_printf("\n");
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return NULL;
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}
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drv = bdrv_find_whitelisted_format(buf);
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if (!drv) {
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error_report("'%s' invalid format", buf);
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return NULL;
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}
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}
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on_write_error = BLOCK_ERR_STOP_ENOSPC;
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if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
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if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
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error_report("werror is not supported by this bus type");
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return NULL;
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}
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on_write_error = parse_block_error_action(buf, 0);
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if (on_write_error < 0) {
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return NULL;
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}
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}
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on_read_error = BLOCK_ERR_REPORT;
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if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
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if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
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error_report("rerror is not supported by this bus type");
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return NULL;
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}
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on_read_error = parse_block_error_action(buf, 1);
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if (on_read_error < 0) {
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return NULL;
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}
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}
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if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
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if (type != IF_VIRTIO) {
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error_report("addr is not supported by this bus type");
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return NULL;
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}
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}
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/* compute bus and unit according index */
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if (index != -1) {
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if (bus_id != 0 || unit_id != -1) {
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error_report("index cannot be used with bus and unit");
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return NULL;
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}
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bus_id = drive_index_to_bus_id(type, index);
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unit_id = drive_index_to_unit_id(type, index);
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}
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/* if user doesn't specify a unit_id,
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* try to find the first free
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*/
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if (unit_id == -1) {
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unit_id = 0;
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while (drive_get(type, bus_id, unit_id) != NULL) {
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unit_id++;
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if (max_devs && unit_id >= max_devs) {
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unit_id -= max_devs;
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bus_id++;
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}
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}
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}
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/* check unit id */
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if (max_devs && unit_id >= max_devs) {
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error_report("unit %d too big (max is %d)",
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unit_id, max_devs - 1);
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return NULL;
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}
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/*
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* catch multiple definitions
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*/
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if (drive_get(type, bus_id, unit_id) != NULL) {
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error_report("drive with bus=%d, unit=%d (index=%d) exists",
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bus_id, unit_id, index);
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return NULL;
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}
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/* init */
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dinfo = qemu_mallocz(sizeof(*dinfo));
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if ((buf = qemu_opts_id(opts)) != NULL) {
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dinfo->id = qemu_strdup(buf);
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} else {
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/* no id supplied -> create one */
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dinfo->id = qemu_mallocz(32);
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if (type == IF_IDE || type == IF_SCSI)
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mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
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if (max_devs)
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snprintf(dinfo->id, 32, "%s%i%s%i",
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devname, bus_id, mediastr, unit_id);
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else
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snprintf(dinfo->id, 32, "%s%s%i",
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devname, mediastr, unit_id);
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}
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dinfo->bdrv = bdrv_new(dinfo->id);
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dinfo->devaddr = devaddr;
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dinfo->type = type;
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dinfo->bus = bus_id;
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dinfo->unit = unit_id;
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dinfo->opts = opts;
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if (serial)
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strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
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QTAILQ_INSERT_TAIL(&drives, dinfo, next);
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bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
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switch(type) {
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case IF_IDE:
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case IF_SCSI:
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case IF_XEN:
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case IF_NONE:
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switch(media) {
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case MEDIA_DISK:
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if (cyls != 0) {
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bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
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bdrv_set_translation_hint(dinfo->bdrv, translation);
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}
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break;
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case MEDIA_CDROM:
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bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
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break;
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}
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break;
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case IF_SD:
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/* FIXME: This isn't really a floppy, but it's a reasonable
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approximation. */
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case IF_FLOPPY:
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bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
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break;
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case IF_PFLASH:
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case IF_MTD:
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break;
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case IF_VIRTIO:
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/* add virtio block device */
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opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
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qemu_opt_set(opts, "driver", "virtio-blk-pci");
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qemu_opt_set(opts, "drive", dinfo->id);
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if (devaddr)
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qemu_opt_set(opts, "addr", devaddr);
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break;
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default:
|
|
abort();
|
|
}
|
|
if (!file || !*file) {
|
|
return dinfo;
|
|
}
|
|
if (snapshot) {
|
|
/* always use cache=unsafe with snapshot */
|
|
bdrv_flags &= ~BDRV_O_CACHE_MASK;
|
|
bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
|
|
}
|
|
|
|
if (media == MEDIA_CDROM) {
|
|
/* CDROM is fine for any interface, don't check. */
|
|
ro = 1;
|
|
} else if (ro == 1) {
|
|
if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
|
|
error_report("readonly not supported by this bus type");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
|
|
|
|
ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
|
|
if (ret < 0) {
|
|
error_report("could not open disk image %s: %s",
|
|
file, strerror(-ret));
|
|
return NULL;
|
|
}
|
|
|
|
if (bdrv_key_required(dinfo->bdrv))
|
|
autostart = 0;
|
|
return dinfo;
|
|
}
|
|
|
|
void do_commit(Monitor *mon, const QDict *qdict)
|
|
{
|
|
const char *device = qdict_get_str(qdict, "device");
|
|
BlockDriverState *bs;
|
|
|
|
if (!strcmp(device, "all")) {
|
|
bdrv_commit_all();
|
|
} else {
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
bdrv_commit(bs);
|
|
}
|
|
}
|
|
|
|
int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
|
|
{
|
|
const char *device = qdict_get_str(qdict, "device");
|
|
const char *filename = qdict_get_try_str(qdict, "snapshot_file");
|
|
const char *format = qdict_get_try_str(qdict, "format");
|
|
BlockDriverState *bs;
|
|
BlockDriver *drv, *proto_drv;
|
|
int ret = 0;
|
|
int flags;
|
|
|
|
if (!filename) {
|
|
qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, device);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (!format) {
|
|
format = "qcow2";
|
|
}
|
|
|
|
drv = bdrv_find_format(format);
|
|
if (!drv) {
|
|
qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
proto_drv = bdrv_find_protocol(filename);
|
|
if (!proto_drv) {
|
|
qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
ret = bdrv_img_create(filename, format, bs->filename,
|
|
bs->drv->format_name, NULL, -1, bs->open_flags);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
qemu_aio_flush();
|
|
bdrv_flush(bs);
|
|
|
|
flags = bs->open_flags;
|
|
bdrv_close(bs);
|
|
ret = bdrv_open(bs, filename, flags, drv);
|
|
/*
|
|
* If reopening the image file we just created fails, we really
|
|
* are in trouble :(
|
|
*/
|
|
if (ret != 0) {
|
|
abort();
|
|
}
|
|
out:
|
|
if (ret) {
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
|
|
{
|
|
if (!force) {
|
|
if (!bdrv_is_removable(bs)) {
|
|
qerror_report(QERR_DEVICE_NOT_REMOVABLE,
|
|
bdrv_get_device_name(bs));
|
|
return -1;
|
|
}
|
|
if (bdrv_is_locked(bs)) {
|
|
qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
|
|
return -1;
|
|
}
|
|
}
|
|
bdrv_close(bs);
|
|
return 0;
|
|
}
|
|
|
|
int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
|
|
{
|
|
BlockDriverState *bs;
|
|
int force = qdict_get_try_bool(qdict, "force", 0);
|
|
const char *filename = qdict_get_str(qdict, "device");
|
|
|
|
bs = bdrv_find(filename);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, filename);
|
|
return -1;
|
|
}
|
|
return eject_device(mon, bs, force);
|
|
}
|
|
|
|
int do_block_set_passwd(Monitor *mon, const QDict *qdict,
|
|
QObject **ret_data)
|
|
{
|
|
BlockDriverState *bs;
|
|
int err;
|
|
|
|
bs = bdrv_find(qdict_get_str(qdict, "device"));
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
|
|
return -1;
|
|
}
|
|
|
|
err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
|
|
if (err == -EINVAL) {
|
|
qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
|
|
return -1;
|
|
} else if (err < 0) {
|
|
qerror_report(QERR_INVALID_PASSWORD);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int do_change_block(Monitor *mon, const char *device,
|
|
const char *filename, const char *fmt)
|
|
{
|
|
BlockDriverState *bs;
|
|
BlockDriver *drv = NULL;
|
|
int bdrv_flags;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, device);
|
|
return -1;
|
|
}
|
|
if (fmt) {
|
|
drv = bdrv_find_whitelisted_format(fmt);
|
|
if (!drv) {
|
|
qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
|
|
return -1;
|
|
}
|
|
}
|
|
if (eject_device(mon, bs, 0) < 0) {
|
|
return -1;
|
|
}
|
|
bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
|
|
bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
|
|
if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
|
|
qerror_report(QERR_OPEN_FILE_FAILED, filename);
|
|
return -1;
|
|
}
|
|
return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
|
|
}
|
|
|
|
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
|
|
{
|
|
const char *id = qdict_get_str(qdict, "id");
|
|
BlockDriverState *bs;
|
|
BlockDriverState **ptr;
|
|
Property *prop;
|
|
|
|
bs = bdrv_find(id);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, id);
|
|
return -1;
|
|
}
|
|
|
|
/* quiesce block driver; prevent further io */
|
|
qemu_aio_flush();
|
|
bdrv_flush(bs);
|
|
bdrv_close(bs);
|
|
|
|
/* clean up guest state from pointing to host resource by
|
|
* finding and removing DeviceState "drive" property */
|
|
if (bs->peer) {
|
|
for (prop = bs->peer->info->props; prop && prop->name; prop++) {
|
|
if (prop->info->type == PROP_TYPE_DRIVE) {
|
|
ptr = qdev_get_prop_ptr(bs->peer, prop);
|
|
if (*ptr == bs) {
|
|
bdrv_detach(bs, bs->peer);
|
|
*ptr = NULL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* clean up host side */
|
|
drive_uninit(drive_get_by_blockdev(bs));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
|
|
* existing QERR_ macro mess is cleaned up. A good example for better
|
|
* error reports can be found in the qemu-img resize code.
|
|
*/
|
|
int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
|
|
{
|
|
const char *device = qdict_get_str(qdict, "device");
|
|
int64_t size = qdict_get_int(qdict, "size");
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, device);
|
|
return -1;
|
|
}
|
|
|
|
if (size < 0) {
|
|
qerror_report(QERR_UNDEFINED_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
if (bdrv_truncate(bs, size)) {
|
|
qerror_report(QERR_UNDEFINED_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|