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/*
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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 "blockdev.h" |
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#include "hw/block-common.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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|
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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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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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for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) |
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; |
322 |
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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} |
326 |
} else {
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type = default_to_scsi ? IF_SCSI : IF_IDE; |
328 |
} |
329 |
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max_devs = if_max_devs[type]; |
331 |
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if (cyls || heads || secs) {
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if (cyls < 1) { |
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error_report("invalid physical cyls number");
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return NULL; |
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} |
337 |
if (heads < 1) { |
338 |
error_report("invalid physical heads number");
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return NULL; |
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} |
341 |
if (secs < 1) { |
342 |
error_report("invalid physical secs number");
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return NULL; |
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} |
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} |
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|
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if ((buf = qemu_opt_get(opts, "trans")) != NULL) { |
348 |
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; |
352 |
} |
353 |
if (!strcmp(buf, "none")) |
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translation = BIOS_ATA_TRANSLATION_NONE; |
355 |
else if (!strcmp(buf, "lba")) |
356 |
translation = BIOS_ATA_TRANSLATION_LBA; |
357 |
else if (!strcmp(buf, "auto")) |
358 |
translation = BIOS_ATA_TRANSLATION_AUTO; |
359 |
else {
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360 |
error_report("'%s' invalid translation type", buf);
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return NULL; |
362 |
} |
363 |
} |
364 |
|
365 |
if ((buf = qemu_opt_get(opts, "media")) != NULL) { |
366 |
if (!strcmp(buf, "disk")) { |
367 |
media = MEDIA_DISK; |
368 |
} else if (!strcmp(buf, "cdrom")) { |
369 |
if (cyls || secs || heads) {
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370 |
error_report("CHS can't be set with media=%s", buf);
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return NULL; |
372 |
} |
373 |
media = MEDIA_CDROM; |
374 |
} else {
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375 |
error_report("'%s' invalid media", buf);
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376 |
return NULL; |
377 |
} |
378 |
} |
379 |
|
380 |
bdrv_flags |= BDRV_O_CACHE_WB; |
381 |
if ((buf = qemu_opt_get(opts, "cache")) != NULL) { |
382 |
if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { |
383 |
error_report("invalid cache option");
|
384 |
return NULL; |
385 |
} |
386 |
} |
387 |
|
388 |
#ifdef CONFIG_LINUX_AIO
|
389 |
if ((buf = qemu_opt_get(opts, "aio")) != NULL) { |
390 |
if (!strcmp(buf, "native")) { |
391 |
bdrv_flags |= BDRV_O_NATIVE_AIO; |
392 |
} else if (!strcmp(buf, "threads")) { |
393 |
/* this is the default */
|
394 |
} else {
|
395 |
error_report("invalid aio option");
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396 |
return NULL; |
397 |
} |
398 |
} |
399 |
#endif
|
400 |
|
401 |
if ((buf = qemu_opt_get(opts, "format")) != NULL) { |
402 |
if (is_help_option(buf)) {
|
403 |
error_printf("Supported formats:");
|
404 |
bdrv_iterate_format(bdrv_format_print, NULL);
|
405 |
error_printf("\n");
|
406 |
return NULL; |
407 |
} |
408 |
drv = bdrv_find_whitelisted_format(buf); |
409 |
if (!drv) {
|
410 |
error_report("'%s' invalid format", buf);
|
411 |
return NULL; |
412 |
} |
413 |
} |
414 |
|
415 |
/* disk I/O throttling */
|
416 |
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = |
417 |
qemu_opt_get_number(opts, "bps", 0); |
418 |
io_limits.bps[BLOCK_IO_LIMIT_READ] = |
419 |
qemu_opt_get_number(opts, "bps_rd", 0); |
420 |
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = |
421 |
qemu_opt_get_number(opts, "bps_wr", 0); |
422 |
io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = |
423 |
qemu_opt_get_number(opts, "iops", 0); |
424 |
io_limits.iops[BLOCK_IO_LIMIT_READ] = |
425 |
qemu_opt_get_number(opts, "iops_rd", 0); |
426 |
io_limits.iops[BLOCK_IO_LIMIT_WRITE] = |
427 |
qemu_opt_get_number(opts, "iops_wr", 0); |
428 |
|
429 |
if (!do_check_io_limits(&io_limits)) {
|
430 |
error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
|
431 |
"cannot be used at the same time");
|
432 |
return NULL; |
433 |
} |
434 |
|
435 |
on_write_error = BLOCK_ERR_STOP_ENOSPC; |
436 |
if ((buf = qemu_opt_get(opts, "werror")) != NULL) { |
437 |
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
|
438 |
error_report("werror is not supported by this bus type");
|
439 |
return NULL; |
440 |
} |
441 |
|
442 |
on_write_error = parse_block_error_action(buf, 0);
|
443 |
if (on_write_error < 0) { |
444 |
return NULL; |
445 |
} |
446 |
} |
447 |
|
448 |
on_read_error = BLOCK_ERR_REPORT; |
449 |
if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { |
450 |
if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
|
451 |
error_report("rerror is not supported by this bus type");
|
452 |
return NULL; |
453 |
} |
454 |
|
455 |
on_read_error = parse_block_error_action(buf, 1);
|
456 |
if (on_read_error < 0) { |
457 |
return NULL; |
458 |
} |
459 |
} |
460 |
|
461 |
if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { |
462 |
if (type != IF_VIRTIO) {
|
463 |
error_report("addr is not supported by this bus type");
|
464 |
return NULL; |
465 |
} |
466 |
} |
467 |
|
468 |
/* compute bus and unit according index */
|
469 |
|
470 |
if (index != -1) { |
471 |
if (bus_id != 0 || unit_id != -1) { |
472 |
error_report("index cannot be used with bus and unit");
|
473 |
return NULL; |
474 |
} |
475 |
bus_id = drive_index_to_bus_id(type, index); |
476 |
unit_id = drive_index_to_unit_id(type, index); |
477 |
} |
478 |
|
479 |
/* if user doesn't specify a unit_id,
|
480 |
* try to find the first free
|
481 |
*/
|
482 |
|
483 |
if (unit_id == -1) { |
484 |
unit_id = 0;
|
485 |
while (drive_get(type, bus_id, unit_id) != NULL) { |
486 |
unit_id++; |
487 |
if (max_devs && unit_id >= max_devs) {
|
488 |
unit_id -= max_devs; |
489 |
bus_id++; |
490 |
} |
491 |
} |
492 |
} |
493 |
|
494 |
/* check unit id */
|
495 |
|
496 |
if (max_devs && unit_id >= max_devs) {
|
497 |
error_report("unit %d too big (max is %d)",
|
498 |
unit_id, max_devs - 1);
|
499 |
return NULL; |
500 |
} |
501 |
|
502 |
/*
|
503 |
* catch multiple definitions
|
504 |
*/
|
505 |
|
506 |
if (drive_get(type, bus_id, unit_id) != NULL) { |
507 |
error_report("drive with bus=%d, unit=%d (index=%d) exists",
|
508 |
bus_id, unit_id, index); |
509 |
return NULL; |
510 |
} |
511 |
|
512 |
/* init */
|
513 |
|
514 |
dinfo = g_malloc0(sizeof(*dinfo));
|
515 |
if ((buf = qemu_opts_id(opts)) != NULL) { |
516 |
dinfo->id = g_strdup(buf); |
517 |
} else {
|
518 |
/* no id supplied -> create one */
|
519 |
dinfo->id = g_malloc0(32);
|
520 |
if (type == IF_IDE || type == IF_SCSI)
|
521 |
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; |
522 |
if (max_devs)
|
523 |
snprintf(dinfo->id, 32, "%s%i%s%i", |
524 |
if_name[type], bus_id, mediastr, unit_id); |
525 |
else
|
526 |
snprintf(dinfo->id, 32, "%s%s%i", |
527 |
if_name[type], mediastr, unit_id); |
528 |
} |
529 |
dinfo->bdrv = bdrv_new(dinfo->id); |
530 |
dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
|
531 |
dinfo->bdrv->read_only = ro; |
532 |
dinfo->devaddr = devaddr; |
533 |
dinfo->type = type; |
534 |
dinfo->bus = bus_id; |
535 |
dinfo->unit = unit_id; |
536 |
dinfo->cyls = cyls; |
537 |
dinfo->heads = heads; |
538 |
dinfo->secs = secs; |
539 |
dinfo->trans = translation; |
540 |
dinfo->opts = opts; |
541 |
dinfo->refcount = 1;
|
542 |
dinfo->serial = serial; |
543 |
QTAILQ_INSERT_TAIL(&drives, dinfo, next); |
544 |
|
545 |
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); |
546 |
|
547 |
/* disk I/O throttling */
|
548 |
bdrv_set_io_limits(dinfo->bdrv, &io_limits); |
549 |
|
550 |
switch(type) {
|
551 |
case IF_IDE:
|
552 |
case IF_SCSI:
|
553 |
case IF_XEN:
|
554 |
case IF_NONE:
|
555 |
dinfo->media_cd = media == MEDIA_CDROM; |
556 |
break;
|
557 |
case IF_SD:
|
558 |
case IF_FLOPPY:
|
559 |
case IF_PFLASH:
|
560 |
case IF_MTD:
|
561 |
break;
|
562 |
case IF_VIRTIO:
|
563 |
/* add virtio block device */
|
564 |
opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL); |
565 |
if (arch_type == QEMU_ARCH_S390X) {
|
566 |
qemu_opt_set(opts, "driver", "virtio-blk-s390"); |
567 |
} else {
|
568 |
qemu_opt_set(opts, "driver", "virtio-blk-pci"); |
569 |
} |
570 |
qemu_opt_set(opts, "drive", dinfo->id);
|
571 |
if (devaddr)
|
572 |
qemu_opt_set(opts, "addr", devaddr);
|
573 |
break;
|
574 |
default:
|
575 |
abort(); |
576 |
} |
577 |
if (!file || !*file) {
|
578 |
return dinfo;
|
579 |
} |
580 |
if (snapshot) {
|
581 |
/* always use cache=unsafe with snapshot */
|
582 |
bdrv_flags &= ~BDRV_O_CACHE_MASK; |
583 |
bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); |
584 |
} |
585 |
|
586 |
if (copy_on_read) {
|
587 |
bdrv_flags |= BDRV_O_COPY_ON_READ; |
588 |
} |
589 |
|
590 |
if (runstate_check(RUN_STATE_INMIGRATE)) {
|
591 |
bdrv_flags |= BDRV_O_INCOMING; |
592 |
} |
593 |
|
594 |
if (media == MEDIA_CDROM) {
|
595 |
/* CDROM is fine for any interface, don't check. */
|
596 |
ro = 1;
|
597 |
} else if (ro == 1) { |
598 |
if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
|
599 |
type != IF_NONE && type != IF_PFLASH) { |
600 |
error_report("readonly not supported by this bus type");
|
601 |
goto err;
|
602 |
} |
603 |
} |
604 |
|
605 |
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
|
606 |
|
607 |
if (ro && copy_on_read) {
|
608 |
error_report("warning: disabling copy_on_read on readonly drive");
|
609 |
} |
610 |
|
611 |
ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); |
612 |
if (ret < 0) { |
613 |
error_report("could not open disk image %s: %s",
|
614 |
file, strerror(-ret)); |
615 |
goto err;
|
616 |
} |
617 |
|
618 |
if (bdrv_key_required(dinfo->bdrv))
|
619 |
autostart = 0;
|
620 |
return dinfo;
|
621 |
|
622 |
err:
|
623 |
bdrv_delete(dinfo->bdrv); |
624 |
g_free(dinfo->id); |
625 |
QTAILQ_REMOVE(&drives, dinfo, next); |
626 |
g_free(dinfo); |
627 |
return NULL; |
628 |
} |
629 |
|
630 |
void do_commit(Monitor *mon, const QDict *qdict) |
631 |
{ |
632 |
const char *device = qdict_get_str(qdict, "device"); |
633 |
BlockDriverState *bs; |
634 |
int ret;
|
635 |
|
636 |
if (!strcmp(device, "all")) { |
637 |
ret = bdrv_commit_all(); |
638 |
if (ret == -EBUSY) {
|
639 |
qerror_report(QERR_DEVICE_IN_USE, device); |
640 |
return;
|
641 |
} |
642 |
} else {
|
643 |
bs = bdrv_find(device); |
644 |
if (!bs) {
|
645 |
qerror_report(QERR_DEVICE_NOT_FOUND, device); |
646 |
return;
|
647 |
} |
648 |
ret = bdrv_commit(bs); |
649 |
if (ret == -EBUSY) {
|
650 |
qerror_report(QERR_DEVICE_IN_USE, device); |
651 |
return;
|
652 |
} |
653 |
} |
654 |
} |
655 |
|
656 |
static void blockdev_do_action(int kind, void *data, Error **errp) |
657 |
{ |
658 |
BlockdevAction action; |
659 |
BlockdevActionList list; |
660 |
|
661 |
action.kind = kind; |
662 |
action.data = data; |
663 |
list.value = &action; |
664 |
list.next = NULL;
|
665 |
qmp_transaction(&list, errp); |
666 |
} |
667 |
|
668 |
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, |
669 |
bool has_format, const char *format, |
670 |
bool has_mode, enum NewImageMode mode, |
671 |
Error **errp) |
672 |
{ |
673 |
BlockdevSnapshot snapshot = { |
674 |
.device = (char *) device,
|
675 |
.snapshot_file = (char *) snapshot_file,
|
676 |
.has_format = has_format, |
677 |
.format = (char *) format,
|
678 |
.has_mode = has_mode, |
679 |
.mode = mode, |
680 |
}; |
681 |
blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, |
682 |
errp); |
683 |
} |
684 |
|
685 |
|
686 |
/* New and old BlockDriverState structs for group snapshots */
|
687 |
typedef struct BlkTransactionStates { |
688 |
BlockDriverState *old_bs; |
689 |
BlockDriverState *new_bs; |
690 |
QSIMPLEQ_ENTRY(BlkTransactionStates) entry; |
691 |
} BlkTransactionStates; |
692 |
|
693 |
/*
|
694 |
* 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
|
695 |
* then we do not pivot any of the devices in the group, and abandon the
|
696 |
* snapshots
|
697 |
*/
|
698 |
void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
|
699 |
{ |
700 |
int ret = 0; |
701 |
BlockdevActionList *dev_entry = dev_list; |
702 |
BlkTransactionStates *states, *next; |
703 |
|
704 |
QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; |
705 |
QSIMPLEQ_INIT(&snap_bdrv_states); |
706 |
|
707 |
/* drain all i/o before any snapshots */
|
708 |
bdrv_drain_all(); |
709 |
|
710 |
/* We don't do anything in this loop that commits us to the snapshot */
|
711 |
while (NULL != dev_entry) { |
712 |
BlockdevAction *dev_info = NULL;
|
713 |
BlockDriver *proto_drv; |
714 |
BlockDriver *drv; |
715 |
int flags;
|
716 |
enum NewImageMode mode;
|
717 |
const char *new_image_file; |
718 |
const char *device; |
719 |
const char *format = "qcow2"; |
720 |
|
721 |
dev_info = dev_entry->value; |
722 |
dev_entry = dev_entry->next; |
723 |
|
724 |
states = g_malloc0(sizeof(BlkTransactionStates));
|
725 |
QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); |
726 |
|
727 |
switch (dev_info->kind) {
|
728 |
case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
|
729 |
device = dev_info->blockdev_snapshot_sync->device; |
730 |
if (!dev_info->blockdev_snapshot_sync->has_mode) {
|
731 |
dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; |
732 |
} |
733 |
new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file; |
734 |
if (dev_info->blockdev_snapshot_sync->has_format) {
|
735 |
format = dev_info->blockdev_snapshot_sync->format; |
736 |
} |
737 |
mode = dev_info->blockdev_snapshot_sync->mode; |
738 |
break;
|
739 |
default:
|
740 |
abort(); |
741 |
} |
742 |
|
743 |
drv = bdrv_find_format(format); |
744 |
if (!drv) {
|
745 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
746 |
goto delete_and_fail;
|
747 |
} |
748 |
|
749 |
states->old_bs = bdrv_find(device); |
750 |
if (!states->old_bs) {
|
751 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
752 |
goto delete_and_fail;
|
753 |
} |
754 |
|
755 |
if (!bdrv_is_inserted(states->old_bs)) {
|
756 |
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); |
757 |
goto delete_and_fail;
|
758 |
} |
759 |
|
760 |
if (bdrv_in_use(states->old_bs)) {
|
761 |
error_set(errp, QERR_DEVICE_IN_USE, device); |
762 |
goto delete_and_fail;
|
763 |
} |
764 |
|
765 |
if (!bdrv_is_read_only(states->old_bs)) {
|
766 |
if (bdrv_flush(states->old_bs)) {
|
767 |
error_set(errp, QERR_IO_ERROR); |
768 |
goto delete_and_fail;
|
769 |
} |
770 |
} |
771 |
|
772 |
flags = states->old_bs->open_flags; |
773 |
|
774 |
proto_drv = bdrv_find_protocol(new_image_file); |
775 |
if (!proto_drv) {
|
776 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
777 |
goto delete_and_fail;
|
778 |
} |
779 |
|
780 |
/* create new image w/backing file */
|
781 |
if (mode != NEW_IMAGE_MODE_EXISTING) {
|
782 |
ret = bdrv_img_create(new_image_file, format, |
783 |
states->old_bs->filename, |
784 |
states->old_bs->drv->format_name, |
785 |
NULL, -1, flags); |
786 |
if (ret) {
|
787 |
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); |
788 |
goto delete_and_fail;
|
789 |
} |
790 |
} |
791 |
|
792 |
/* We will manually add the backing_hd field to the bs later */
|
793 |
states->new_bs = bdrv_new("");
|
794 |
ret = bdrv_open(states->new_bs, new_image_file, |
795 |
flags | BDRV_O_NO_BACKING, drv); |
796 |
if (ret != 0) { |
797 |
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); |
798 |
goto delete_and_fail;
|
799 |
} |
800 |
} |
801 |
|
802 |
|
803 |
/* Now we are going to do the actual pivot. Everything up to this point
|
804 |
* is reversible, but we are committed at this point */
|
805 |
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { |
806 |
/* This removes our old bs from the bdrv_states, and adds the new bs */
|
807 |
bdrv_append(states->new_bs, states->old_bs); |
808 |
/* We don't need (or want) to use the transactional
|
809 |
* bdrv_reopen_multiple() across all the entries at once, because we
|
810 |
* don't want to abort all of them if one of them fails the reopen */
|
811 |
bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR, |
812 |
NULL);
|
813 |
} |
814 |
|
815 |
/* success */
|
816 |
goto exit;
|
817 |
|
818 |
delete_and_fail:
|
819 |
/*
|
820 |
* failure, and it is all-or-none; abandon each new bs, and keep using
|
821 |
* the original bs for all images
|
822 |
*/
|
823 |
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { |
824 |
if (states->new_bs) {
|
825 |
bdrv_delete(states->new_bs); |
826 |
} |
827 |
} |
828 |
exit:
|
829 |
QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { |
830 |
g_free(states); |
831 |
} |
832 |
return;
|
833 |
} |
834 |
|
835 |
|
836 |
static void eject_device(BlockDriverState *bs, int force, Error **errp) |
837 |
{ |
838 |
if (bdrv_in_use(bs)) {
|
839 |
error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
840 |
return;
|
841 |
} |
842 |
if (!bdrv_dev_has_removable_media(bs)) {
|
843 |
error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); |
844 |
return;
|
845 |
} |
846 |
|
847 |
if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
|
848 |
bdrv_dev_eject_request(bs, force); |
849 |
if (!force) {
|
850 |
error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); |
851 |
return;
|
852 |
} |
853 |
} |
854 |
|
855 |
bdrv_close(bs); |
856 |
} |
857 |
|
858 |
void qmp_eject(const char *device, bool has_force, bool force, Error **errp) |
859 |
{ |
860 |
BlockDriverState *bs; |
861 |
|
862 |
bs = bdrv_find(device); |
863 |
if (!bs) {
|
864 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
865 |
return;
|
866 |
} |
867 |
|
868 |
eject_device(bs, force, errp); |
869 |
} |
870 |
|
871 |
void qmp_block_passwd(const char *device, const char *password, Error **errp) |
872 |
{ |
873 |
BlockDriverState *bs; |
874 |
int err;
|
875 |
|
876 |
bs = bdrv_find(device); |
877 |
if (!bs) {
|
878 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
879 |
return;
|
880 |
} |
881 |
|
882 |
err = bdrv_set_key(bs, password); |
883 |
if (err == -EINVAL) {
|
884 |
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); |
885 |
return;
|
886 |
} else if (err < 0) { |
887 |
error_set(errp, QERR_INVALID_PASSWORD); |
888 |
return;
|
889 |
} |
890 |
} |
891 |
|
892 |
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, |
893 |
int bdrv_flags, BlockDriver *drv,
|
894 |
const char *password, Error **errp) |
895 |
{ |
896 |
if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { |
897 |
error_set(errp, QERR_OPEN_FILE_FAILED, filename); |
898 |
return;
|
899 |
} |
900 |
|
901 |
if (bdrv_key_required(bs)) {
|
902 |
if (password) {
|
903 |
if (bdrv_set_key(bs, password) < 0) { |
904 |
error_set(errp, QERR_INVALID_PASSWORD); |
905 |
} |
906 |
} else {
|
907 |
error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), |
908 |
bdrv_get_encrypted_filename(bs)); |
909 |
} |
910 |
} else if (password) { |
911 |
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); |
912 |
} |
913 |
} |
914 |
|
915 |
void qmp_change_blockdev(const char *device, const char *filename, |
916 |
bool has_format, const char *format, Error **errp) |
917 |
{ |
918 |
BlockDriverState *bs; |
919 |
BlockDriver *drv = NULL;
|
920 |
int bdrv_flags;
|
921 |
Error *err = NULL;
|
922 |
|
923 |
bs = bdrv_find(device); |
924 |
if (!bs) {
|
925 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
926 |
return;
|
927 |
} |
928 |
|
929 |
if (format) {
|
930 |
drv = bdrv_find_whitelisted_format(format); |
931 |
if (!drv) {
|
932 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
933 |
return;
|
934 |
} |
935 |
} |
936 |
|
937 |
eject_device(bs, 0, &err);
|
938 |
if (error_is_set(&err)) {
|
939 |
error_propagate(errp, err); |
940 |
return;
|
941 |
} |
942 |
|
943 |
bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
|
944 |
bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
|
945 |
|
946 |
qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
|
947 |
} |
948 |
|
949 |
/* throttling disk I/O limits */
|
950 |
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, |
951 |
int64_t bps_wr, int64_t iops, int64_t iops_rd, |
952 |
int64_t iops_wr, Error **errp) |
953 |
{ |
954 |
BlockIOLimit io_limits; |
955 |
BlockDriverState *bs; |
956 |
|
957 |
bs = bdrv_find(device); |
958 |
if (!bs) {
|
959 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
960 |
return;
|
961 |
} |
962 |
|
963 |
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; |
964 |
io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; |
965 |
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; |
966 |
io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; |
967 |
io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; |
968 |
io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; |
969 |
|
970 |
if (!do_check_io_limits(&io_limits)) {
|
971 |
error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); |
972 |
return;
|
973 |
} |
974 |
|
975 |
bs->io_limits = io_limits; |
976 |
bs->slice_time = BLOCK_IO_SLICE_TIME; |
977 |
|
978 |
if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
|
979 |
bdrv_io_limits_enable(bs); |
980 |
} else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { |
981 |
bdrv_io_limits_disable(bs); |
982 |
} else {
|
983 |
if (bs->block_timer) {
|
984 |
qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); |
985 |
} |
986 |
} |
987 |
} |
988 |
|
989 |
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) |
990 |
{ |
991 |
const char *id = qdict_get_str(qdict, "id"); |
992 |
BlockDriverState *bs; |
993 |
|
994 |
bs = bdrv_find(id); |
995 |
if (!bs) {
|
996 |
qerror_report(QERR_DEVICE_NOT_FOUND, id); |
997 |
return -1; |
998 |
} |
999 |
if (bdrv_in_use(bs)) {
|
1000 |
qerror_report(QERR_DEVICE_IN_USE, id); |
1001 |
return -1; |
1002 |
} |
1003 |
|
1004 |
/* quiesce block driver; prevent further io */
|
1005 |
bdrv_drain_all(); |
1006 |
bdrv_flush(bs); |
1007 |
bdrv_close(bs); |
1008 |
|
1009 |
/* if we have a device attached to this BlockDriverState
|
1010 |
* then we need to make the drive anonymous until the device
|
1011 |
* can be removed. If this is a drive with no device backing
|
1012 |
* then we can just get rid of the block driver state right here.
|
1013 |
*/
|
1014 |
if (bdrv_get_attached_dev(bs)) {
|
1015 |
bdrv_make_anon(bs); |
1016 |
} else {
|
1017 |
drive_uninit(drive_get_by_blockdev(bs)); |
1018 |
} |
1019 |
|
1020 |
return 0; |
1021 |
} |
1022 |
|
1023 |
void qmp_block_resize(const char *device, int64_t size, Error **errp) |
1024 |
{ |
1025 |
BlockDriverState *bs; |
1026 |
|
1027 |
bs = bdrv_find(device); |
1028 |
if (!bs) {
|
1029 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
1030 |
return;
|
1031 |
} |
1032 |
|
1033 |
if (size < 0) { |
1034 |
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); |
1035 |
return;
|
1036 |
} |
1037 |
|
1038 |
switch (bdrv_truncate(bs, size)) {
|
1039 |
case 0: |
1040 |
break;
|
1041 |
case -ENOMEDIUM:
|
1042 |
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); |
1043 |
break;
|
1044 |
case -ENOTSUP:
|
1045 |
error_set(errp, QERR_UNSUPPORTED); |
1046 |
break;
|
1047 |
case -EACCES:
|
1048 |
error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); |
1049 |
break;
|
1050 |
case -EBUSY:
|
1051 |
error_set(errp, QERR_DEVICE_IN_USE, device); |
1052 |
break;
|
1053 |
default:
|
1054 |
error_set(errp, QERR_UNDEFINED_ERROR); |
1055 |
break;
|
1056 |
} |
1057 |
} |
1058 |
|
1059 |
static QObject *qobject_from_block_job(BlockJob *job)
|
1060 |
{ |
1061 |
return qobject_from_jsonf("{ 'type': %s," |
1062 |
"'device': %s,"
|
1063 |
"'len': %" PRId64 "," |
1064 |
"'offset': %" PRId64 "," |
1065 |
"'speed': %" PRId64 " }", |
1066 |
job->job_type->job_type, |
1067 |
bdrv_get_device_name(job->bs), |
1068 |
job->len, |
1069 |
job->offset, |
1070 |
job->speed); |
1071 |
} |
1072 |
|
1073 |
static void block_job_cb(void *opaque, int ret) |
1074 |
{ |
1075 |
BlockDriverState *bs = opaque; |
1076 |
QObject *obj; |
1077 |
|
1078 |
trace_block_job_cb(bs, bs->job, ret); |
1079 |
|
1080 |
assert(bs->job); |
1081 |
obj = qobject_from_block_job(bs->job); |
1082 |
if (ret < 0) { |
1083 |
QDict *dict = qobject_to_qdict(obj); |
1084 |
qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
|
1085 |
} |
1086 |
|
1087 |
if (block_job_is_cancelled(bs->job)) {
|
1088 |
monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); |
1089 |
} else {
|
1090 |
monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); |
1091 |
} |
1092 |
qobject_decref(obj); |
1093 |
|
1094 |
drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); |
1095 |
} |
1096 |
|
1097 |
void qmp_block_stream(const char *device, bool has_base, |
1098 |
const char *base, bool has_speed, |
1099 |
int64_t speed, Error **errp) |
1100 |
{ |
1101 |
BlockDriverState *bs; |
1102 |
BlockDriverState *base_bs = NULL;
|
1103 |
Error *local_err = NULL;
|
1104 |
|
1105 |
bs = bdrv_find(device); |
1106 |
if (!bs) {
|
1107 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
1108 |
return;
|
1109 |
} |
1110 |
|
1111 |
if (base) {
|
1112 |
base_bs = bdrv_find_backing_image(bs, base); |
1113 |
if (base_bs == NULL) { |
1114 |
error_set(errp, QERR_BASE_NOT_FOUND, base); |
1115 |
return;
|
1116 |
} |
1117 |
} |
1118 |
|
1119 |
stream_start(bs, base_bs, base, has_speed ? speed : 0,
|
1120 |
block_job_cb, bs, &local_err); |
1121 |
if (error_is_set(&local_err)) {
|
1122 |
error_propagate(errp, local_err); |
1123 |
return;
|
1124 |
} |
1125 |
|
1126 |
/* Grab a reference so hotplug does not delete the BlockDriverState from
|
1127 |
* underneath us.
|
1128 |
*/
|
1129 |
drive_get_ref(drive_get_by_blockdev(bs)); |
1130 |
|
1131 |
trace_qmp_block_stream(bs, bs->job); |
1132 |
} |
1133 |
|
1134 |
static BlockJob *find_block_job(const char *device) |
1135 |
{ |
1136 |
BlockDriverState *bs; |
1137 |
|
1138 |
bs = bdrv_find(device); |
1139 |
if (!bs || !bs->job) {
|
1140 |
return NULL; |
1141 |
} |
1142 |
return bs->job;
|
1143 |
} |
1144 |
|
1145 |
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) |
1146 |
{ |
1147 |
BlockJob *job = find_block_job(device); |
1148 |
|
1149 |
if (!job) {
|
1150 |
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); |
1151 |
return;
|
1152 |
} |
1153 |
|
1154 |
block_job_set_speed(job, speed, errp); |
1155 |
} |
1156 |
|
1157 |
void qmp_block_job_cancel(const char *device, Error **errp) |
1158 |
{ |
1159 |
BlockJob *job = find_block_job(device); |
1160 |
|
1161 |
if (!job) {
|
1162 |
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); |
1163 |
return;
|
1164 |
} |
1165 |
|
1166 |
trace_qmp_block_job_cancel(job); |
1167 |
block_job_cancel(job); |
1168 |
} |
1169 |
|
1170 |
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) |
1171 |
{ |
1172 |
BlockJobInfoList **prev = opaque; |
1173 |
BlockJob *job = bs->job; |
1174 |
|
1175 |
if (job) {
|
1176 |
BlockJobInfoList *elem; |
1177 |
BlockJobInfo *info = g_new(BlockJobInfo, 1);
|
1178 |
*info = (BlockJobInfo){ |
1179 |
.type = g_strdup(job->job_type->job_type), |
1180 |
.device = g_strdup(bdrv_get_device_name(bs)), |
1181 |
.len = job->len, |
1182 |
.offset = job->offset, |
1183 |
.speed = job->speed, |
1184 |
}; |
1185 |
|
1186 |
elem = g_new0(BlockJobInfoList, 1);
|
1187 |
elem->value = info; |
1188 |
|
1189 |
(*prev)->next = elem; |
1190 |
*prev = elem; |
1191 |
} |
1192 |
} |
1193 |
|
1194 |
BlockJobInfoList *qmp_query_block_jobs(Error **errp) |
1195 |
{ |
1196 |
/* Dummy is a fake list element for holding the head pointer */
|
1197 |
BlockJobInfoList dummy = {}; |
1198 |
BlockJobInfoList *prev = &dummy; |
1199 |
bdrv_iterate(do_qmp_query_block_jobs_one, &prev); |
1200 |
return dummy.next;
|
1201 |
} |