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https://github.com/qemu/qemu.git
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c83c66c3b5
Allow streaming operations to be started with an initial speed limit. This eliminates the window of time between starting streaming and issuing block-job-set-speed. Users should use the new optional 'speed' parameter instead so that speed limits are in effect immediately when the job starts. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
1198 lines
32 KiB
C
1198 lines
32 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 "qemu-objects.h"
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#include "sysemu.h"
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#include "block_int.h"
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#include "qmp-commands.h"
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#include "trace.h"
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#include "arch_init.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 (bs->job) {
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block_job_cancel(bs->job);
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}
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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_put_ref(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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static 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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g_free(dinfo->id);
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QTAILQ_REMOVE(&drives, dinfo, next);
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g_free(dinfo);
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}
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void drive_put_ref(DriveInfo *dinfo)
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{
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assert(dinfo->refcount);
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if (--dinfo->refcount == 0) {
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drive_uninit(dinfo);
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}
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}
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void drive_get_ref(DriveInfo *dinfo)
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{
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dinfo->refcount++;
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}
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typedef struct {
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QEMUBH *bh;
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DriveInfo *dinfo;
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} DrivePutRefBH;
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static void drive_put_ref_bh(void *opaque)
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{
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DrivePutRefBH *s = opaque;
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drive_put_ref(s->dinfo);
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qemu_bh_delete(s->bh);
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g_free(s);
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}
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/*
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* Release a drive reference in a BH
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*
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* It is not possible to use drive_put_ref() from a callback function when the
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* callers still need the drive. In such cases we schedule a BH to release the
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* reference.
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*/
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static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
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{
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DrivePutRefBH *s;
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s = g_new(DrivePutRefBH, 1);
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s->bh = qemu_bh_new(drive_put_ref_bh, s);
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s->dinfo = dinfo;
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qemu_bh_schedule(s->bh);
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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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static bool do_check_io_limits(BlockIOLimit *io_limits)
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{
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bool bps_flag;
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bool iops_flag;
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assert(io_limits);
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bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
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&& ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
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|| (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
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iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
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&& ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
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|| (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
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if (bps_flag || iops_flag) {
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return false;
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}
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return true;
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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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BlockIOLimit io_limits;
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int snapshot = 0;
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bool copy_on_read;
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int ret;
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translation = BIOS_ATA_TRANSLATION_AUTO;
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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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copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
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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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} else {
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type = default_to_scsi ? IF_SCSI : IF_IDE;
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pstrcpy(devname, sizeof(devname), if_name[type]);
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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("CHS can't be set with media=%s", 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 (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
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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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/* disk I/O throttling */
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io_limits.bps[BLOCK_IO_LIMIT_TOTAL] =
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qemu_opt_get_number(opts, "bps", 0);
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io_limits.bps[BLOCK_IO_LIMIT_READ] =
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qemu_opt_get_number(opts, "bps_rd", 0);
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io_limits.bps[BLOCK_IO_LIMIT_WRITE] =
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qemu_opt_get_number(opts, "bps_wr", 0);
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io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
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qemu_opt_get_number(opts, "iops", 0);
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io_limits.iops[BLOCK_IO_LIMIT_READ] =
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qemu_opt_get_number(opts, "iops_rd", 0);
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io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
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qemu_opt_get_number(opts, "iops_wr", 0);
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if (!do_check_io_limits(&io_limits)) {
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error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
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"cannot be used at the same time");
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return NULL;
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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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|
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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) {
|
|
error_report("drive with bus=%d, unit=%d (index=%d) exists",
|
|
bus_id, unit_id, index);
|
|
return NULL;
|
|
}
|
|
|
|
/* init */
|
|
|
|
dinfo = g_malloc0(sizeof(*dinfo));
|
|
if ((buf = qemu_opts_id(opts)) != NULL) {
|
|
dinfo->id = g_strdup(buf);
|
|
} else {
|
|
/* no id supplied -> create one */
|
|
dinfo->id = g_malloc0(32);
|
|
if (type == IF_IDE || type == IF_SCSI)
|
|
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
|
|
if (max_devs)
|
|
snprintf(dinfo->id, 32, "%s%i%s%i",
|
|
devname, bus_id, mediastr, unit_id);
|
|
else
|
|
snprintf(dinfo->id, 32, "%s%s%i",
|
|
devname, mediastr, unit_id);
|
|
}
|
|
dinfo->bdrv = bdrv_new(dinfo->id);
|
|
dinfo->devaddr = devaddr;
|
|
dinfo->type = type;
|
|
dinfo->bus = bus_id;
|
|
dinfo->unit = unit_id;
|
|
dinfo->opts = opts;
|
|
dinfo->refcount = 1;
|
|
if (serial) {
|
|
pstrcpy(dinfo->serial, sizeof(dinfo->serial), serial);
|
|
}
|
|
QTAILQ_INSERT_TAIL(&drives, dinfo, next);
|
|
|
|
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
|
|
|
|
/* disk I/O throttling */
|
|
bdrv_set_io_limits(dinfo->bdrv, &io_limits);
|
|
|
|
switch(type) {
|
|
case IF_IDE:
|
|
case IF_SCSI:
|
|
case IF_XEN:
|
|
case IF_NONE:
|
|
switch(media) {
|
|
case MEDIA_DISK:
|
|
if (cyls != 0) {
|
|
bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
|
|
bdrv_set_translation_hint(dinfo->bdrv, translation);
|
|
}
|
|
break;
|
|
case MEDIA_CDROM:
|
|
dinfo->media_cd = 1;
|
|
break;
|
|
}
|
|
break;
|
|
case IF_SD:
|
|
case IF_FLOPPY:
|
|
case IF_PFLASH:
|
|
case IF_MTD:
|
|
break;
|
|
case IF_VIRTIO:
|
|
/* add virtio block device */
|
|
opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
|
|
if (arch_type == QEMU_ARCH_S390X) {
|
|
qemu_opt_set(opts, "driver", "virtio-blk-s390");
|
|
} else {
|
|
qemu_opt_set(opts, "driver", "virtio-blk-pci");
|
|
}
|
|
qemu_opt_set(opts, "drive", dinfo->id);
|
|
if (devaddr)
|
|
qemu_opt_set(opts, "addr", devaddr);
|
|
break;
|
|
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 (copy_on_read) {
|
|
bdrv_flags |= BDRV_O_COPY_ON_READ;
|
|
}
|
|
|
|
if (runstate_check(RUN_STATE_INMIGRATE)) {
|
|
bdrv_flags |= BDRV_O_INCOMING;
|
|
}
|
|
|
|
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 && type != IF_PFLASH) {
|
|
error_report("readonly not supported by this bus type");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
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));
|
|
goto err;
|
|
}
|
|
|
|
if (bdrv_key_required(dinfo->bdrv))
|
|
autostart = 0;
|
|
return dinfo;
|
|
|
|
err:
|
|
bdrv_delete(dinfo->bdrv);
|
|
g_free(dinfo->id);
|
|
QTAILQ_REMOVE(&drives, dinfo, next);
|
|
g_free(dinfo);
|
|
return NULL;
|
|
}
|
|
|
|
void do_commit(Monitor *mon, const QDict *qdict)
|
|
{
|
|
const char *device = qdict_get_str(qdict, "device");
|
|
BlockDriverState *bs;
|
|
int ret;
|
|
|
|
if (!strcmp(device, "all")) {
|
|
ret = bdrv_commit_all();
|
|
if (ret == -EBUSY) {
|
|
qerror_report(QERR_DEVICE_IN_USE, device);
|
|
return;
|
|
}
|
|
} else {
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
ret = bdrv_commit(bs);
|
|
if (ret == -EBUSY) {
|
|
qerror_report(QERR_DEVICE_IN_USE, device);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void blockdev_do_action(int kind, void *data, Error **errp)
|
|
{
|
|
BlockdevAction action;
|
|
BlockdevActionList list;
|
|
|
|
action.kind = kind;
|
|
action.data = data;
|
|
list.value = &action;
|
|
list.next = NULL;
|
|
qmp_transaction(&list, errp);
|
|
}
|
|
|
|
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
|
|
bool has_format, const char *format,
|
|
bool has_mode, enum NewImageMode mode,
|
|
Error **errp)
|
|
{
|
|
BlockdevSnapshot snapshot = {
|
|
.device = (char *) device,
|
|
.snapshot_file = (char *) snapshot_file,
|
|
.has_format = has_format,
|
|
.format = (char *) format,
|
|
.has_mode = has_mode,
|
|
.mode = mode,
|
|
};
|
|
blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
|
|
errp);
|
|
}
|
|
|
|
|
|
/* New and old BlockDriverState structs for group snapshots */
|
|
typedef struct BlkTransactionStates {
|
|
BlockDriverState *old_bs;
|
|
BlockDriverState *new_bs;
|
|
QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
|
|
} BlkTransactionStates;
|
|
|
|
/*
|
|
* 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
|
|
* then we do not pivot any of the devices in the group, and abandon the
|
|
* snapshots
|
|
*/
|
|
void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
|
|
{
|
|
int ret = 0;
|
|
BlockdevActionList *dev_entry = dev_list;
|
|
BlkTransactionStates *states, *next;
|
|
|
|
QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
|
|
QSIMPLEQ_INIT(&snap_bdrv_states);
|
|
|
|
/* drain all i/o before any snapshots */
|
|
bdrv_drain_all();
|
|
|
|
/* We don't do anything in this loop that commits us to the snapshot */
|
|
while (NULL != dev_entry) {
|
|
BlockdevAction *dev_info = NULL;
|
|
BlockDriver *proto_drv;
|
|
BlockDriver *drv;
|
|
int flags;
|
|
enum NewImageMode mode;
|
|
const char *new_image_file;
|
|
const char *device;
|
|
const char *format = "qcow2";
|
|
|
|
dev_info = dev_entry->value;
|
|
dev_entry = dev_entry->next;
|
|
|
|
states = g_malloc0(sizeof(BlkTransactionStates));
|
|
QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
|
|
|
|
switch (dev_info->kind) {
|
|
case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
|
|
device = dev_info->blockdev_snapshot_sync->device;
|
|
if (!dev_info->blockdev_snapshot_sync->has_mode) {
|
|
dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
|
|
}
|
|
new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
|
|
if (dev_info->blockdev_snapshot_sync->has_format) {
|
|
format = dev_info->blockdev_snapshot_sync->format;
|
|
}
|
|
mode = dev_info->blockdev_snapshot_sync->mode;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
drv = bdrv_find_format(format);
|
|
if (!drv) {
|
|
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
|
|
goto delete_and_fail;
|
|
}
|
|
|
|
states->old_bs = bdrv_find(device);
|
|
if (!states->old_bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
goto delete_and_fail;
|
|
}
|
|
|
|
if (bdrv_in_use(states->old_bs)) {
|
|
error_set(errp, QERR_DEVICE_IN_USE, device);
|
|
goto delete_and_fail;
|
|
}
|
|
|
|
if (!bdrv_is_read_only(states->old_bs) &&
|
|
bdrv_is_inserted(states->old_bs)) {
|
|
|
|
if (bdrv_flush(states->old_bs)) {
|
|
error_set(errp, QERR_IO_ERROR);
|
|
goto delete_and_fail;
|
|
}
|
|
}
|
|
|
|
flags = states->old_bs->open_flags;
|
|
|
|
proto_drv = bdrv_find_protocol(new_image_file);
|
|
if (!proto_drv) {
|
|
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
|
|
goto delete_and_fail;
|
|
}
|
|
|
|
/* create new image w/backing file */
|
|
if (mode != NEW_IMAGE_MODE_EXISTING) {
|
|
ret = bdrv_img_create(new_image_file, format,
|
|
states->old_bs->filename,
|
|
states->old_bs->drv->format_name,
|
|
NULL, -1, flags);
|
|
if (ret) {
|
|
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
|
|
goto delete_and_fail;
|
|
}
|
|
}
|
|
|
|
/* We will manually add the backing_hd field to the bs later */
|
|
states->new_bs = bdrv_new("");
|
|
ret = bdrv_open(states->new_bs, new_image_file,
|
|
flags | BDRV_O_NO_BACKING, drv);
|
|
if (ret != 0) {
|
|
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
|
|
goto delete_and_fail;
|
|
}
|
|
}
|
|
|
|
|
|
/* Now we are going to do the actual pivot. Everything up to this point
|
|
* is reversible, but we are committed at this point */
|
|
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
|
|
/* This removes our old bs from the bdrv_states, and adds the new bs */
|
|
bdrv_append(states->new_bs, states->old_bs);
|
|
}
|
|
|
|
/* success */
|
|
goto exit;
|
|
|
|
delete_and_fail:
|
|
/*
|
|
* failure, and it is all-or-none; abandon each new bs, and keep using
|
|
* the original bs for all images
|
|
*/
|
|
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
|
|
if (states->new_bs) {
|
|
bdrv_delete(states->new_bs);
|
|
}
|
|
}
|
|
exit:
|
|
QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
|
|
g_free(states);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
static void eject_device(BlockDriverState *bs, int force, Error **errp)
|
|
{
|
|
if (bdrv_in_use(bs)) {
|
|
error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
|
|
return;
|
|
}
|
|
if (!bdrv_dev_has_removable_media(bs)) {
|
|
error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
|
|
return;
|
|
}
|
|
|
|
if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
|
|
bdrv_dev_eject_request(bs, force);
|
|
if (!force) {
|
|
error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
|
|
return;
|
|
}
|
|
}
|
|
|
|
bdrv_close(bs);
|
|
}
|
|
|
|
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
eject_device(bs, force, errp);
|
|
}
|
|
|
|
void qmp_block_passwd(const char *device, const char *password, Error **errp)
|
|
{
|
|
BlockDriverState *bs;
|
|
int err;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
err = bdrv_set_key(bs, password);
|
|
if (err == -EINVAL) {
|
|
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
|
|
return;
|
|
} else if (err < 0) {
|
|
error_set(errp, QERR_INVALID_PASSWORD);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
|
|
int bdrv_flags, BlockDriver *drv,
|
|
const char *password, Error **errp)
|
|
{
|
|
if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
|
|
error_set(errp, QERR_OPEN_FILE_FAILED, filename);
|
|
return;
|
|
}
|
|
|
|
if (bdrv_key_required(bs)) {
|
|
if (password) {
|
|
if (bdrv_set_key(bs, password) < 0) {
|
|
error_set(errp, QERR_INVALID_PASSWORD);
|
|
}
|
|
} else {
|
|
error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
|
|
bdrv_get_encrypted_filename(bs));
|
|
}
|
|
} else if (password) {
|
|
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
|
|
}
|
|
}
|
|
|
|
void qmp_change_blockdev(const char *device, const char *filename,
|
|
bool has_format, const char *format, Error **errp)
|
|
{
|
|
BlockDriverState *bs;
|
|
BlockDriver *drv = NULL;
|
|
int bdrv_flags;
|
|
Error *err = NULL;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
if (format) {
|
|
drv = bdrv_find_whitelisted_format(format);
|
|
if (!drv) {
|
|
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
|
|
return;
|
|
}
|
|
}
|
|
|
|
eject_device(bs, 0, &err);
|
|
if (error_is_set(&err)) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
|
|
bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
|
|
|
|
qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
|
|
}
|
|
|
|
/* throttling disk I/O limits */
|
|
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
|
|
int64_t bps_wr, int64_t iops, int64_t iops_rd,
|
|
int64_t iops_wr, Error **errp)
|
|
{
|
|
BlockIOLimit io_limits;
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
|
|
io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd;
|
|
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
|
|
io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
|
|
io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
|
|
io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
|
|
|
|
if (!do_check_io_limits(&io_limits)) {
|
|
error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
|
|
return;
|
|
}
|
|
|
|
bs->io_limits = io_limits;
|
|
bs->slice_time = BLOCK_IO_SLICE_TIME;
|
|
|
|
if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
|
|
bdrv_io_limits_enable(bs);
|
|
} else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
|
|
bdrv_io_limits_disable(bs);
|
|
} else {
|
|
if (bs->block_timer) {
|
|
qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
|
|
}
|
|
}
|
|
}
|
|
|
|
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
|
|
{
|
|
const char *id = qdict_get_str(qdict, "id");
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(id);
|
|
if (!bs) {
|
|
qerror_report(QERR_DEVICE_NOT_FOUND, id);
|
|
return -1;
|
|
}
|
|
if (bdrv_in_use(bs)) {
|
|
qerror_report(QERR_DEVICE_IN_USE, id);
|
|
return -1;
|
|
}
|
|
|
|
/* quiesce block driver; prevent further io */
|
|
bdrv_drain_all();
|
|
bdrv_flush(bs);
|
|
bdrv_close(bs);
|
|
|
|
/* if we have a device attached to this BlockDriverState
|
|
* then we need to make the drive anonymous until the device
|
|
* can be removed. If this is a drive with no device backing
|
|
* then we can just get rid of the block driver state right here.
|
|
*/
|
|
if (bdrv_get_attached_dev(bs)) {
|
|
bdrv_make_anon(bs);
|
|
} else {
|
|
drive_uninit(drive_get_by_blockdev(bs));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void qmp_block_resize(const char *device, int64_t size, Error **errp)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
if (size < 0) {
|
|
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
|
|
return;
|
|
}
|
|
|
|
switch (bdrv_truncate(bs, size)) {
|
|
case 0:
|
|
break;
|
|
case -ENOMEDIUM:
|
|
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
|
|
break;
|
|
case -ENOTSUP:
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
break;
|
|
case -EACCES:
|
|
error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
|
|
break;
|
|
case -EBUSY:
|
|
error_set(errp, QERR_DEVICE_IN_USE, device);
|
|
break;
|
|
default:
|
|
error_set(errp, QERR_UNDEFINED_ERROR);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static QObject *qobject_from_block_job(BlockJob *job)
|
|
{
|
|
return qobject_from_jsonf("{ 'type': %s,"
|
|
"'device': %s,"
|
|
"'len': %" PRId64 ","
|
|
"'offset': %" PRId64 ","
|
|
"'speed': %" PRId64 " }",
|
|
job->job_type->job_type,
|
|
bdrv_get_device_name(job->bs),
|
|
job->len,
|
|
job->offset,
|
|
job->speed);
|
|
}
|
|
|
|
static void block_stream_cb(void *opaque, int ret)
|
|
{
|
|
BlockDriverState *bs = opaque;
|
|
QObject *obj;
|
|
|
|
trace_block_stream_cb(bs, bs->job, ret);
|
|
|
|
assert(bs->job);
|
|
obj = qobject_from_block_job(bs->job);
|
|
if (ret < 0) {
|
|
QDict *dict = qobject_to_qdict(obj);
|
|
qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
|
|
}
|
|
|
|
if (block_job_is_cancelled(bs->job)) {
|
|
monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
|
|
} else {
|
|
monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
|
|
}
|
|
qobject_decref(obj);
|
|
|
|
drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
|
|
}
|
|
|
|
void qmp_block_stream(const char *device, bool has_base,
|
|
const char *base, bool has_speed,
|
|
int64_t speed, Error **errp)
|
|
{
|
|
BlockDriverState *bs;
|
|
BlockDriverState *base_bs = NULL;
|
|
Error *local_err = NULL;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs) {
|
|
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
|
|
return;
|
|
}
|
|
|
|
if (base) {
|
|
base_bs = bdrv_find_backing_image(bs, base);
|
|
if (base_bs == NULL) {
|
|
error_set(errp, QERR_BASE_NOT_FOUND, base);
|
|
return;
|
|
}
|
|
}
|
|
|
|
stream_start(bs, base_bs, base, has_speed ? speed : 0,
|
|
block_stream_cb, bs, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
|
|
/* Grab a reference so hotplug does not delete the BlockDriverState from
|
|
* underneath us.
|
|
*/
|
|
drive_get_ref(drive_get_by_blockdev(bs));
|
|
|
|
trace_qmp_block_stream(bs, bs->job);
|
|
}
|
|
|
|
static BlockJob *find_block_job(const char *device)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
bs = bdrv_find(device);
|
|
if (!bs || !bs->job) {
|
|
return NULL;
|
|
}
|
|
return bs->job;
|
|
}
|
|
|
|
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
|
|
{
|
|
BlockJob *job = find_block_job(device);
|
|
|
|
if (!job) {
|
|
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
|
|
return;
|
|
}
|
|
|
|
block_job_set_speed(job, speed, errp);
|
|
}
|
|
|
|
void qmp_block_job_cancel(const char *device, Error **errp)
|
|
{
|
|
BlockJob *job = find_block_job(device);
|
|
|
|
if (!job) {
|
|
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
|
|
return;
|
|
}
|
|
|
|
trace_qmp_block_job_cancel(job);
|
|
block_job_cancel(job);
|
|
}
|
|
|
|
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
|
|
{
|
|
BlockJobInfoList **prev = opaque;
|
|
BlockJob *job = bs->job;
|
|
|
|
if (job) {
|
|
BlockJobInfoList *elem;
|
|
BlockJobInfo *info = g_new(BlockJobInfo, 1);
|
|
*info = (BlockJobInfo){
|
|
.type = g_strdup(job->job_type->job_type),
|
|
.device = g_strdup(bdrv_get_device_name(bs)),
|
|
.len = job->len,
|
|
.offset = job->offset,
|
|
.speed = job->speed,
|
|
};
|
|
|
|
elem = g_new0(BlockJobInfoList, 1);
|
|
elem->value = info;
|
|
|
|
(*prev)->next = elem;
|
|
*prev = elem;
|
|
}
|
|
}
|
|
|
|
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
|
|
{
|
|
/* Dummy is a fake list element for holding the head pointer */
|
|
BlockJobInfoList dummy = {};
|
|
BlockJobInfoList *prev = &dummy;
|
|
bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
|
|
return dummy.next;
|
|
}
|