From 6d4a2b3a47959f02e7f307f50396e70e8464f95e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 24 Jan 2011 13:32:33 +0100 Subject: block: add block_resize monitor command 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 Signed-off-by: Kevin Wolf --- hmp-commands.hx | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'hmp-commands.hx') diff --git a/hmp-commands.hx b/hmp-commands.hx index 1cea572b15..8df4adf831 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -52,6 +52,25 @@ STEXI Quit the emulator. ETEXI + { + .name = "block_resize", + .args_type = "device:B,size:o", + .params = "device size", + .help = "resize a block image", + .user_print = monitor_user_noop, + .mhandler.cmd_new = do_block_resize, + }, + +STEXI +@item block_resize +@findex block_resize +Resize a block image while a guest is running. Usually requires guest +action to see the updated size. Resize to a lower size is supported, +but should be used with extreme caution. Note that this command only +resizes image files, it can not resize block devices like LVM volumes. +ETEXI + + { .name = "eject", .args_type = "force:-f,device:B", -- cgit v1.2.1