6d4a2b3a47
Add a monitor command that allows resizing of block devices while qemu is running. It uses the existing bdrv_truncate method already used by qemu-img to do it's work. Compared to qemu-img the size parsing is very simplicistic, but I think having a properly numering object is more useful for non-humand monitor users than having the units and relative resize parsing. For SCSI devices the new size can be updated in Linux guests by doing the following shell command: echo > /sys/class/scsi_device/0:0:0:0/device/rescan For ATA devices I don't know of a way to update the block device size in Linux system, and for virtio-blk the next two patches will provide an automatic update of the size when this command is issued on the host. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
59 lines
1.7 KiB
C
59 lines
1.7 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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#ifndef BLOCKDEV_H
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#define BLOCKDEV_H
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#include "block.h"
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#include "qemu-queue.h"
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void blockdev_mark_auto_del(BlockDriverState *bs);
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void blockdev_auto_del(BlockDriverState *bs);
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#define BLOCK_SERIAL_STRLEN 20
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struct DriveInfo {
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BlockDriverState *bdrv;
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char *id;
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const char *devaddr;
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BlockInterfaceType type;
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int bus;
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int unit;
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int auto_del; /* see blockdev_mark_auto_del() */
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QemuOpts *opts;
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char serial[BLOCK_SERIAL_STRLEN + 1];
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QTAILQ_ENTRY(DriveInfo) next;
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};
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#define MAX_IDE_DEVS 2
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#define MAX_SCSI_DEVS 255
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DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
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int drive_get_max_bus(BlockInterfaceType type);
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void drive_uninit(DriveInfo *dinfo);
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DriveInfo *drive_get_by_blockdev(BlockDriverState *bs);
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QemuOpts *drive_add(const char *file, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
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DriveInfo *drive_init(QemuOpts *arg, int default_to_scsi, int *fatal_error);
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/* device-hotplug */
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DriveInfo *add_init_drive(const char *opts);
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void do_commit(Monitor *mon, const QDict *qdict);
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int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data);
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int do_block_set_passwd(Monitor *mon, const QDict *qdict, QObject **ret_data);
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int do_change_block(Monitor *mon, const char *device,
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const char *filename, const char *fmt);
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int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
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int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data);
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int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data);
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#endif
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