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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 "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 (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++) |
320 |
; |
321 |
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; |
327 |
pstrcpy(devname, sizeof(devname), if_name[type]);
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} |
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 || (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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} |
337 |
if (heads < 1 || (type == IF_IDE && heads > 16)) { |
338 |
error_report("invalid physical heads number");
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return NULL; |
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} |
341 |
if (secs < 1 || (type == IF_IDE && secs > 63)) { |
342 |
error_report("invalid physical secs number");
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return NULL; |
344 |
} |
345 |
} |
346 |
|
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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); |
351 |
return NULL; |
352 |
} |
353 |
if (!strcmp(buf, "none")) |
354 |
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) {
|
370 |
error_report("CHS can't be set with media=%s", buf);
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371 |
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 |
if ((buf = qemu_opt_get(opts, "cache")) != NULL) { |
381 |
if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { |
382 |
error_report("invalid cache option");
|
383 |
return NULL; |
384 |
} |
385 |
} |
386 |
|
387 |
#ifdef CONFIG_LINUX_AIO
|
388 |
if ((buf = qemu_opt_get(opts, "aio")) != NULL) { |
389 |
if (!strcmp(buf, "native")) { |
390 |
bdrv_flags |= BDRV_O_NATIVE_AIO; |
391 |
} else if (!strcmp(buf, "threads")) { |
392 |
/* this is the default */
|
393 |
} else {
|
394 |
error_report("invalid aio option");
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395 |
return NULL; |
396 |
} |
397 |
} |
398 |
#endif
|
399 |
|
400 |
if ((buf = qemu_opt_get(opts, "format")) != NULL) { |
401 |
if (strcmp(buf, "?") == 0) { |
402 |
error_printf("Supported formats:");
|
403 |
bdrv_iterate_format(bdrv_format_print, NULL);
|
404 |
error_printf("\n");
|
405 |
return NULL; |
406 |
} |
407 |
drv = bdrv_find_whitelisted_format(buf); |
408 |
if (!drv) {
|
409 |
error_report("'%s' invalid format", buf);
|
410 |
return NULL; |
411 |
} |
412 |
} |
413 |
|
414 |
/* disk I/O throttling */
|
415 |
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = |
416 |
qemu_opt_get_number(opts, "bps", 0); |
417 |
io_limits.bps[BLOCK_IO_LIMIT_READ] = |
418 |
qemu_opt_get_number(opts, "bps_rd", 0); |
419 |
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = |
420 |
qemu_opt_get_number(opts, "bps_wr", 0); |
421 |
io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = |
422 |
qemu_opt_get_number(opts, "iops", 0); |
423 |
io_limits.iops[BLOCK_IO_LIMIT_READ] = |
424 |
qemu_opt_get_number(opts, "iops_rd", 0); |
425 |
io_limits.iops[BLOCK_IO_LIMIT_WRITE] = |
426 |
qemu_opt_get_number(opts, "iops_wr", 0); |
427 |
|
428 |
if (!do_check_io_limits(&io_limits)) {
|
429 |
error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
|
430 |
"cannot be used at the same time");
|
431 |
return NULL; |
432 |
} |
433 |
|
434 |
on_write_error = BLOCK_ERR_STOP_ENOSPC; |
435 |
if ((buf = qemu_opt_get(opts, "werror")) != NULL) { |
436 |
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
|
437 |
error_report("werror is not supported by this bus type");
|
438 |
return NULL; |
439 |
} |
440 |
|
441 |
on_write_error = parse_block_error_action(buf, 0);
|
442 |
if (on_write_error < 0) { |
443 |
return NULL; |
444 |
} |
445 |
} |
446 |
|
447 |
on_read_error = BLOCK_ERR_REPORT; |
448 |
if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { |
449 |
if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
|
450 |
error_report("rerror is not supported by this bus type");
|
451 |
return NULL; |
452 |
} |
453 |
|
454 |
on_read_error = parse_block_error_action(buf, 1);
|
455 |
if (on_read_error < 0) { |
456 |
return NULL; |
457 |
} |
458 |
} |
459 |
|
460 |
if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { |
461 |
if (type != IF_VIRTIO) {
|
462 |
error_report("addr is not supported by this bus type");
|
463 |
return NULL; |
464 |
} |
465 |
} |
466 |
|
467 |
/* compute bus and unit according index */
|
468 |
|
469 |
if (index != -1) { |
470 |
if (bus_id != 0 || unit_id != -1) { |
471 |
error_report("index cannot be used with bus and unit");
|
472 |
return NULL; |
473 |
} |
474 |
bus_id = drive_index_to_bus_id(type, index); |
475 |
unit_id = drive_index_to_unit_id(type, index); |
476 |
} |
477 |
|
478 |
/* if user doesn't specify a unit_id,
|
479 |
* try to find the first free
|
480 |
*/
|
481 |
|
482 |
if (unit_id == -1) { |
483 |
unit_id = 0;
|
484 |
while (drive_get(type, bus_id, unit_id) != NULL) { |
485 |
unit_id++; |
486 |
if (max_devs && unit_id >= max_devs) {
|
487 |
unit_id -= max_devs; |
488 |
bus_id++; |
489 |
} |
490 |
} |
491 |
} |
492 |
|
493 |
/* check unit id */
|
494 |
|
495 |
if (max_devs && unit_id >= max_devs) {
|
496 |
error_report("unit %d too big (max is %d)",
|
497 |
unit_id, max_devs - 1);
|
498 |
return NULL; |
499 |
} |
500 |
|
501 |
/*
|
502 |
* catch multiple definitions
|
503 |
*/
|
504 |
|
505 |
if (drive_get(type, bus_id, unit_id) != NULL) { |
506 |
error_report("drive with bus=%d, unit=%d (index=%d) exists",
|
507 |
bus_id, unit_id, index); |
508 |
return NULL; |
509 |
} |
510 |
|
511 |
/* init */
|
512 |
|
513 |
dinfo = g_malloc0(sizeof(*dinfo));
|
514 |
if ((buf = qemu_opts_id(opts)) != NULL) { |
515 |
dinfo->id = g_strdup(buf); |
516 |
} else {
|
517 |
/* no id supplied -> create one */
|
518 |
dinfo->id = g_malloc0(32);
|
519 |
if (type == IF_IDE || type == IF_SCSI)
|
520 |
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; |
521 |
if (max_devs)
|
522 |
snprintf(dinfo->id, 32, "%s%i%s%i", |
523 |
devname, bus_id, mediastr, unit_id); |
524 |
else
|
525 |
snprintf(dinfo->id, 32, "%s%s%i", |
526 |
devname, mediastr, unit_id); |
527 |
} |
528 |
dinfo->bdrv = bdrv_new(dinfo->id); |
529 |
dinfo->devaddr = devaddr; |
530 |
dinfo->type = type; |
531 |
dinfo->bus = bus_id; |
532 |
dinfo->unit = unit_id; |
533 |
dinfo->opts = opts; |
534 |
dinfo->refcount = 1;
|
535 |
if (serial)
|
536 |
strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); |
537 |
QTAILQ_INSERT_TAIL(&drives, dinfo, next); |
538 |
|
539 |
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); |
540 |
|
541 |
/* disk I/O throttling */
|
542 |
bdrv_set_io_limits(dinfo->bdrv, &io_limits); |
543 |
|
544 |
switch(type) {
|
545 |
case IF_IDE:
|
546 |
case IF_SCSI:
|
547 |
case IF_XEN:
|
548 |
case IF_NONE:
|
549 |
switch(media) {
|
550 |
case MEDIA_DISK:
|
551 |
if (cyls != 0) { |
552 |
bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); |
553 |
bdrv_set_translation_hint(dinfo->bdrv, translation); |
554 |
} |
555 |
break;
|
556 |
case MEDIA_CDROM:
|
557 |
dinfo->media_cd = 1;
|
558 |
break;
|
559 |
} |
560 |
break;
|
561 |
case IF_SD:
|
562 |
case IF_FLOPPY:
|
563 |
case IF_PFLASH:
|
564 |
case IF_MTD:
|
565 |
break;
|
566 |
case IF_VIRTIO:
|
567 |
/* add virtio block device */
|
568 |
opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); |
569 |
if (arch_type == QEMU_ARCH_S390X) {
|
570 |
qemu_opt_set(opts, "driver", "virtio-blk-s390"); |
571 |
} else {
|
572 |
qemu_opt_set(opts, "driver", "virtio-blk-pci"); |
573 |
} |
574 |
qemu_opt_set(opts, "drive", dinfo->id);
|
575 |
if (devaddr)
|
576 |
qemu_opt_set(opts, "addr", devaddr);
|
577 |
break;
|
578 |
default:
|
579 |
abort(); |
580 |
} |
581 |
if (!file || !*file) {
|
582 |
return dinfo;
|
583 |
} |
584 |
if (snapshot) {
|
585 |
/* always use cache=unsafe with snapshot */
|
586 |
bdrv_flags &= ~BDRV_O_CACHE_MASK; |
587 |
bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); |
588 |
} |
589 |
|
590 |
if (copy_on_read) {
|
591 |
bdrv_flags |= BDRV_O_COPY_ON_READ; |
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 |
ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); |
608 |
if (ret < 0) { |
609 |
error_report("could not open disk image %s: %s",
|
610 |
file, strerror(-ret)); |
611 |
goto err;
|
612 |
} |
613 |
|
614 |
if (bdrv_key_required(dinfo->bdrv))
|
615 |
autostart = 0;
|
616 |
return dinfo;
|
617 |
|
618 |
err:
|
619 |
bdrv_delete(dinfo->bdrv); |
620 |
g_free(dinfo->id); |
621 |
QTAILQ_REMOVE(&drives, dinfo, next); |
622 |
g_free(dinfo); |
623 |
return NULL; |
624 |
} |
625 |
|
626 |
void do_commit(Monitor *mon, const QDict *qdict) |
627 |
{ |
628 |
const char *device = qdict_get_str(qdict, "device"); |
629 |
BlockDriverState *bs; |
630 |
|
631 |
if (!strcmp(device, "all")) { |
632 |
bdrv_commit_all(); |
633 |
} else {
|
634 |
int ret;
|
635 |
|
636 |
bs = bdrv_find(device); |
637 |
if (!bs) {
|
638 |
qerror_report(QERR_DEVICE_NOT_FOUND, device); |
639 |
return;
|
640 |
} |
641 |
ret = bdrv_commit(bs); |
642 |
if (ret == -EBUSY) {
|
643 |
qerror_report(QERR_DEVICE_IN_USE, device); |
644 |
return;
|
645 |
} |
646 |
} |
647 |
} |
648 |
|
649 |
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, |
650 |
bool has_format, const char *format, |
651 |
Error **errp) |
652 |
{ |
653 |
BlockDriverState *bs; |
654 |
BlockDriver *drv, *old_drv, *proto_drv; |
655 |
int ret = 0; |
656 |
int flags;
|
657 |
char old_filename[1024]; |
658 |
|
659 |
bs = bdrv_find(device); |
660 |
if (!bs) {
|
661 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
662 |
return;
|
663 |
} |
664 |
if (bdrv_in_use(bs)) {
|
665 |
error_set(errp, QERR_DEVICE_IN_USE, device); |
666 |
return;
|
667 |
} |
668 |
|
669 |
pstrcpy(old_filename, sizeof(old_filename), bs->filename);
|
670 |
|
671 |
old_drv = bs->drv; |
672 |
flags = bs->open_flags; |
673 |
|
674 |
if (!has_format) {
|
675 |
format = "qcow2";
|
676 |
} |
677 |
|
678 |
drv = bdrv_find_format(format); |
679 |
if (!drv) {
|
680 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
681 |
return;
|
682 |
} |
683 |
|
684 |
proto_drv = bdrv_find_protocol(snapshot_file); |
685 |
if (!proto_drv) {
|
686 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
687 |
return;
|
688 |
} |
689 |
|
690 |
ret = bdrv_img_create(snapshot_file, format, bs->filename, |
691 |
bs->drv->format_name, NULL, -1, flags); |
692 |
if (ret) {
|
693 |
error_set(errp, QERR_UNDEFINED_ERROR); |
694 |
return;
|
695 |
} |
696 |
|
697 |
bdrv_drain_all(); |
698 |
bdrv_flush(bs); |
699 |
|
700 |
bdrv_close(bs); |
701 |
ret = bdrv_open(bs, snapshot_file, flags, drv); |
702 |
/*
|
703 |
* If reopening the image file we just created fails, fall back
|
704 |
* and try to re-open the original image. If that fails too, we
|
705 |
* are in serious trouble.
|
706 |
*/
|
707 |
if (ret != 0) { |
708 |
ret = bdrv_open(bs, old_filename, flags, old_drv); |
709 |
if (ret != 0) { |
710 |
error_set(errp, QERR_OPEN_FILE_FAILED, old_filename); |
711 |
} else {
|
712 |
error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); |
713 |
} |
714 |
} |
715 |
} |
716 |
|
717 |
|
718 |
/* New and old BlockDriverState structs for group snapshots */
|
719 |
typedef struct BlkGroupSnapshotStates { |
720 |
BlockDriverState *old_bs; |
721 |
BlockDriverState *new_bs; |
722 |
QSIMPLEQ_ENTRY(BlkGroupSnapshotStates) entry; |
723 |
} BlkGroupSnapshotStates; |
724 |
|
725 |
/*
|
726 |
* 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
|
727 |
* then we do not pivot any of the devices in the group, and abandon the
|
728 |
* snapshots
|
729 |
*/
|
730 |
void qmp_blockdev_group_snapshot_sync(SnapshotDevList *dev_list,
|
731 |
Error **errp) |
732 |
{ |
733 |
int ret = 0; |
734 |
SnapshotDevList *dev_entry = dev_list; |
735 |
SnapshotDev *dev_info = NULL;
|
736 |
BlkGroupSnapshotStates *states; |
737 |
BlockDriver *proto_drv; |
738 |
BlockDriver *drv; |
739 |
int flags;
|
740 |
const char *format; |
741 |
const char *snapshot_file; |
742 |
|
743 |
QSIMPLEQ_HEAD(snap_bdrv_states, BlkGroupSnapshotStates) snap_bdrv_states; |
744 |
QSIMPLEQ_INIT(&snap_bdrv_states); |
745 |
|
746 |
/* drain all i/o before any snapshots */
|
747 |
bdrv_drain_all(); |
748 |
|
749 |
/* We don't do anything in this loop that commits us to the snapshot */
|
750 |
while (NULL != dev_entry) { |
751 |
dev_info = dev_entry->value; |
752 |
dev_entry = dev_entry->next; |
753 |
|
754 |
states = g_malloc0(sizeof(BlkGroupSnapshotStates));
|
755 |
QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); |
756 |
|
757 |
states->old_bs = bdrv_find(dev_info->device); |
758 |
|
759 |
if (!states->old_bs) {
|
760 |
error_set(errp, QERR_DEVICE_NOT_FOUND, dev_info->device); |
761 |
goto delete_and_fail;
|
762 |
} |
763 |
|
764 |
if (bdrv_in_use(states->old_bs)) {
|
765 |
error_set(errp, QERR_DEVICE_IN_USE, dev_info->device); |
766 |
goto delete_and_fail;
|
767 |
} |
768 |
|
769 |
if (!bdrv_is_read_only(states->old_bs) &&
|
770 |
bdrv_is_inserted(states->old_bs)) { |
771 |
|
772 |
if (bdrv_flush(states->old_bs)) {
|
773 |
error_set(errp, QERR_IO_ERROR); |
774 |
goto delete_and_fail;
|
775 |
} |
776 |
} |
777 |
|
778 |
snapshot_file = dev_info->snapshot_file; |
779 |
|
780 |
flags = states->old_bs->open_flags; |
781 |
|
782 |
if (!dev_info->has_format) {
|
783 |
format = "qcow2";
|
784 |
} else {
|
785 |
format = dev_info->format; |
786 |
} |
787 |
|
788 |
drv = bdrv_find_format(format); |
789 |
if (!drv) {
|
790 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
791 |
goto delete_and_fail;
|
792 |
} |
793 |
|
794 |
proto_drv = bdrv_find_protocol(snapshot_file); |
795 |
if (!proto_drv) {
|
796 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
797 |
goto delete_and_fail;
|
798 |
} |
799 |
|
800 |
/* create new image w/backing file */
|
801 |
ret = bdrv_img_create(snapshot_file, format, |
802 |
states->old_bs->filename, |
803 |
drv->format_name, NULL, -1, flags); |
804 |
if (ret) {
|
805 |
error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); |
806 |
goto delete_and_fail;
|
807 |
} |
808 |
|
809 |
/* We will manually add the backing_hd field to the bs later */
|
810 |
states->new_bs = bdrv_new("");
|
811 |
ret = bdrv_open(states->new_bs, snapshot_file, |
812 |
flags | BDRV_O_NO_BACKING, drv); |
813 |
if (ret != 0) { |
814 |
error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); |
815 |
goto delete_and_fail;
|
816 |
} |
817 |
} |
818 |
|
819 |
|
820 |
/* Now we are going to do the actual pivot. Everything up to this point
|
821 |
* is reversible, but we are committed at this point */
|
822 |
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { |
823 |
/* This removes our old bs from the bdrv_states, and adds the new bs */
|
824 |
bdrv_append(states->new_bs, states->old_bs); |
825 |
} |
826 |
|
827 |
/* success */
|
828 |
goto exit;
|
829 |
|
830 |
delete_and_fail:
|
831 |
/*
|
832 |
* failure, and it is all-or-none; abandon each new bs, and keep using
|
833 |
* the original bs for all images
|
834 |
*/
|
835 |
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { |
836 |
if (states->new_bs) {
|
837 |
bdrv_delete(states->new_bs); |
838 |
} |
839 |
} |
840 |
exit:
|
841 |
QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { |
842 |
g_free(states); |
843 |
} |
844 |
return;
|
845 |
} |
846 |
|
847 |
|
848 |
static void eject_device(BlockDriverState *bs, int force, Error **errp) |
849 |
{ |
850 |
if (bdrv_in_use(bs)) {
|
851 |
error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
852 |
return;
|
853 |
} |
854 |
if (!bdrv_dev_has_removable_media(bs)) {
|
855 |
error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); |
856 |
return;
|
857 |
} |
858 |
|
859 |
if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
|
860 |
bdrv_dev_eject_request(bs, force); |
861 |
if (!force) {
|
862 |
error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); |
863 |
return;
|
864 |
} |
865 |
} |
866 |
|
867 |
bdrv_close(bs); |
868 |
} |
869 |
|
870 |
void qmp_eject(const char *device, bool has_force, bool force, Error **errp) |
871 |
{ |
872 |
BlockDriverState *bs; |
873 |
|
874 |
bs = bdrv_find(device); |
875 |
if (!bs) {
|
876 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
877 |
return;
|
878 |
} |
879 |
|
880 |
eject_device(bs, force, errp); |
881 |
} |
882 |
|
883 |
void qmp_block_passwd(const char *device, const char *password, Error **errp) |
884 |
{ |
885 |
BlockDriverState *bs; |
886 |
int err;
|
887 |
|
888 |
bs = bdrv_find(device); |
889 |
if (!bs) {
|
890 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
891 |
return;
|
892 |
} |
893 |
|
894 |
err = bdrv_set_key(bs, password); |
895 |
if (err == -EINVAL) {
|
896 |
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); |
897 |
return;
|
898 |
} else if (err < 0) { |
899 |
error_set(errp, QERR_INVALID_PASSWORD); |
900 |
return;
|
901 |
} |
902 |
} |
903 |
|
904 |
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, |
905 |
int bdrv_flags, BlockDriver *drv,
|
906 |
const char *password, Error **errp) |
907 |
{ |
908 |
if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { |
909 |
error_set(errp, QERR_OPEN_FILE_FAILED, filename); |
910 |
return;
|
911 |
} |
912 |
|
913 |
if (bdrv_key_required(bs)) {
|
914 |
if (password) {
|
915 |
if (bdrv_set_key(bs, password) < 0) { |
916 |
error_set(errp, QERR_INVALID_PASSWORD); |
917 |
} |
918 |
} else {
|
919 |
error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), |
920 |
bdrv_get_encrypted_filename(bs)); |
921 |
} |
922 |
} else if (password) { |
923 |
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); |
924 |
} |
925 |
} |
926 |
|
927 |
void qmp_change_blockdev(const char *device, const char *filename, |
928 |
bool has_format, const char *format, Error **errp) |
929 |
{ |
930 |
BlockDriverState *bs; |
931 |
BlockDriver *drv = NULL;
|
932 |
int bdrv_flags;
|
933 |
Error *err = NULL;
|
934 |
|
935 |
bs = bdrv_find(device); |
936 |
if (!bs) {
|
937 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
938 |
return;
|
939 |
} |
940 |
|
941 |
if (format) {
|
942 |
drv = bdrv_find_whitelisted_format(format); |
943 |
if (!drv) {
|
944 |
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); |
945 |
return;
|
946 |
} |
947 |
} |
948 |
|
949 |
eject_device(bs, 0, &err);
|
950 |
if (error_is_set(&err)) {
|
951 |
error_propagate(errp, err); |
952 |
return;
|
953 |
} |
954 |
|
955 |
bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
|
956 |
bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
|
957 |
|
958 |
qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
|
959 |
} |
960 |
|
961 |
/* throttling disk I/O limits */
|
962 |
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, |
963 |
int64_t bps_wr, int64_t iops, int64_t iops_rd, |
964 |
int64_t iops_wr, Error **errp) |
965 |
{ |
966 |
BlockIOLimit io_limits; |
967 |
BlockDriverState *bs; |
968 |
|
969 |
bs = bdrv_find(device); |
970 |
if (!bs) {
|
971 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
972 |
return;
|
973 |
} |
974 |
|
975 |
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; |
976 |
io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; |
977 |
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; |
978 |
io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; |
979 |
io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; |
980 |
io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; |
981 |
|
982 |
if (!do_check_io_limits(&io_limits)) {
|
983 |
error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); |
984 |
return;
|
985 |
} |
986 |
|
987 |
bs->io_limits = io_limits; |
988 |
bs->slice_time = BLOCK_IO_SLICE_TIME; |
989 |
|
990 |
if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
|
991 |
bdrv_io_limits_enable(bs); |
992 |
} else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { |
993 |
bdrv_io_limits_disable(bs); |
994 |
} else {
|
995 |
if (bs->block_timer) {
|
996 |
qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); |
997 |
} |
998 |
} |
999 |
} |
1000 |
|
1001 |
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) |
1002 |
{ |
1003 |
const char *id = qdict_get_str(qdict, "id"); |
1004 |
BlockDriverState *bs; |
1005 |
|
1006 |
bs = bdrv_find(id); |
1007 |
if (!bs) {
|
1008 |
qerror_report(QERR_DEVICE_NOT_FOUND, id); |
1009 |
return -1; |
1010 |
} |
1011 |
if (bdrv_in_use(bs)) {
|
1012 |
qerror_report(QERR_DEVICE_IN_USE, id); |
1013 |
return -1; |
1014 |
} |
1015 |
|
1016 |
/* quiesce block driver; prevent further io */
|
1017 |
bdrv_drain_all(); |
1018 |
bdrv_flush(bs); |
1019 |
bdrv_close(bs); |
1020 |
|
1021 |
/* if we have a device attached to this BlockDriverState
|
1022 |
* then we need to make the drive anonymous until the device
|
1023 |
* can be removed. If this is a drive with no device backing
|
1024 |
* then we can just get rid of the block driver state right here.
|
1025 |
*/
|
1026 |
if (bdrv_get_attached_dev(bs)) {
|
1027 |
bdrv_make_anon(bs); |
1028 |
} else {
|
1029 |
drive_uninit(drive_get_by_blockdev(bs)); |
1030 |
} |
1031 |
|
1032 |
return 0; |
1033 |
} |
1034 |
|
1035 |
void qmp_block_resize(const char *device, int64_t size, Error **errp) |
1036 |
{ |
1037 |
BlockDriverState *bs; |
1038 |
|
1039 |
bs = bdrv_find(device); |
1040 |
if (!bs) {
|
1041 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
1042 |
return;
|
1043 |
} |
1044 |
|
1045 |
if (size < 0) { |
1046 |
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); |
1047 |
return;
|
1048 |
} |
1049 |
|
1050 |
switch (bdrv_truncate(bs, size)) {
|
1051 |
case 0: |
1052 |
break;
|
1053 |
case -ENOMEDIUM:
|
1054 |
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); |
1055 |
break;
|
1056 |
case -ENOTSUP:
|
1057 |
error_set(errp, QERR_UNSUPPORTED); |
1058 |
break;
|
1059 |
case -EACCES:
|
1060 |
error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); |
1061 |
break;
|
1062 |
case -EBUSY:
|
1063 |
error_set(errp, QERR_DEVICE_IN_USE, device); |
1064 |
break;
|
1065 |
default:
|
1066 |
error_set(errp, QERR_UNDEFINED_ERROR); |
1067 |
break;
|
1068 |
} |
1069 |
} |
1070 |
|
1071 |
static QObject *qobject_from_block_job(BlockJob *job)
|
1072 |
{ |
1073 |
return qobject_from_jsonf("{ 'type': %s," |
1074 |
"'device': %s,"
|
1075 |
"'len': %" PRId64 "," |
1076 |
"'offset': %" PRId64 "," |
1077 |
"'speed': %" PRId64 " }", |
1078 |
job->job_type->job_type, |
1079 |
bdrv_get_device_name(job->bs), |
1080 |
job->len, |
1081 |
job->offset, |
1082 |
job->speed); |
1083 |
} |
1084 |
|
1085 |
static void block_stream_cb(void *opaque, int ret) |
1086 |
{ |
1087 |
BlockDriverState *bs = opaque; |
1088 |
QObject *obj; |
1089 |
|
1090 |
trace_block_stream_cb(bs, bs->job, ret); |
1091 |
|
1092 |
assert(bs->job); |
1093 |
obj = qobject_from_block_job(bs->job); |
1094 |
if (ret < 0) { |
1095 |
QDict *dict = qobject_to_qdict(obj); |
1096 |
qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
|
1097 |
} |
1098 |
|
1099 |
if (block_job_is_cancelled(bs->job)) {
|
1100 |
monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); |
1101 |
} else {
|
1102 |
monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); |
1103 |
} |
1104 |
qobject_decref(obj); |
1105 |
|
1106 |
drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); |
1107 |
} |
1108 |
|
1109 |
void qmp_block_stream(const char *device, bool has_base, |
1110 |
const char *base, Error **errp) |
1111 |
{ |
1112 |
BlockDriverState *bs; |
1113 |
BlockDriverState *base_bs = NULL;
|
1114 |
int ret;
|
1115 |
|
1116 |
bs = bdrv_find(device); |
1117 |
if (!bs) {
|
1118 |
error_set(errp, QERR_DEVICE_NOT_FOUND, device); |
1119 |
return;
|
1120 |
} |
1121 |
|
1122 |
if (base) {
|
1123 |
base_bs = bdrv_find_backing_image(bs, base); |
1124 |
if (base_bs == NULL) { |
1125 |
error_set(errp, QERR_BASE_NOT_FOUND, base); |
1126 |
return;
|
1127 |
} |
1128 |
} |
1129 |
|
1130 |
ret = stream_start(bs, base_bs, base, block_stream_cb, bs); |
1131 |
if (ret < 0) { |
1132 |
switch (ret) {
|
1133 |
case -EBUSY:
|
1134 |
error_set(errp, QERR_DEVICE_IN_USE, device); |
1135 |
return;
|
1136 |
default:
|
1137 |
error_set(errp, QERR_NOT_SUPPORTED); |
1138 |
return;
|
1139 |
} |
1140 |
} |
1141 |
|
1142 |
/* Grab a reference so hotplug does not delete the BlockDriverState from
|
1143 |
* underneath us.
|
1144 |
*/
|
1145 |
drive_get_ref(drive_get_by_blockdev(bs)); |
1146 |
|
1147 |
trace_qmp_block_stream(bs, bs->job); |
1148 |
} |
1149 |
|
1150 |
static BlockJob *find_block_job(const char *device) |
1151 |
{ |
1152 |
BlockDriverState *bs; |
1153 |
|
1154 |
bs = bdrv_find(device); |
1155 |
if (!bs || !bs->job) {
|
1156 |
return NULL; |
1157 |
} |
1158 |
return bs->job;
|
1159 |
} |
1160 |
|
1161 |
void qmp_block_job_set_speed(const char *device, int64_t value, Error **errp) |
1162 |
{ |
1163 |
BlockJob *job = find_block_job(device); |
1164 |
|
1165 |
if (!job) {
|
1166 |
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); |
1167 |
return;
|
1168 |
} |
1169 |
|
1170 |
if (block_job_set_speed(job, value) < 0) { |
1171 |
error_set(errp, QERR_NOT_SUPPORTED); |
1172 |
} |
1173 |
} |
1174 |
|
1175 |
void qmp_block_job_cancel(const char *device, Error **errp) |
1176 |
{ |
1177 |
BlockJob *job = find_block_job(device); |
1178 |
|
1179 |
if (!job) {
|
1180 |
error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); |
1181 |
return;
|
1182 |
} |
1183 |
|
1184 |
trace_qmp_block_job_cancel(job); |
1185 |
block_job_cancel(job); |
1186 |
} |
1187 |
|
1188 |
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) |
1189 |
{ |
1190 |
BlockJobInfoList **prev = opaque; |
1191 |
BlockJob *job = bs->job; |
1192 |
|
1193 |
if (job) {
|
1194 |
BlockJobInfoList *elem; |
1195 |
BlockJobInfo *info = g_new(BlockJobInfo, 1);
|
1196 |
*info = (BlockJobInfo){ |
1197 |
.type = g_strdup(job->job_type->job_type), |
1198 |
.device = g_strdup(bdrv_get_device_name(bs)), |
1199 |
.len = job->len, |
1200 |
.offset = job->offset, |
1201 |
.speed = job->speed, |
1202 |
}; |
1203 |
|
1204 |
elem = g_new0(BlockJobInfoList, 1);
|
1205 |
elem->value = info; |
1206 |
|
1207 |
(*prev)->next = elem; |
1208 |
*prev = elem; |
1209 |
} |
1210 |
} |
1211 |
|
1212 |
BlockJobInfoList *qmp_query_block_jobs(Error **errp) |
1213 |
{ |
1214 |
/* Dummy is a fake list element for holding the head pointer */
|
1215 |
BlockJobInfoList dummy = {}; |
1216 |
BlockJobInfoList *prev = &dummy; |
1217 |
bdrv_iterate(do_qmp_query_block_jobs_one, &prev); |
1218 |
return dummy.next;
|
1219 |
} |