#include "qerror.h"
#include "qemu-option.h"
#include "qemu-config.h"
+#include "qemu-objects.h"
#include "sysemu.h"
#include "block_int.h"
#include "qmp-commands.h"
+#include "trace.h"
+#include "arch_init.h"
static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
{
DriveInfo *dinfo = drive_get_by_blockdev(bs);
+ if (bs->job) {
+ block_job_cancel(bs->job);
+ }
if (dinfo) {
dinfo->auto_del = 1;
}
dinfo->refcount++;
}
+typedef struct {
+ QEMUBH *bh;
+ DriveInfo *dinfo;
+} DrivePutRefBH;
+
+static void drive_put_ref_bh(void *opaque)
+{
+ DrivePutRefBH *s = opaque;
+
+ drive_put_ref(s->dinfo);
+ qemu_bh_delete(s->bh);
+ g_free(s);
+}
+
+/*
+ * Release a drive reference in a BH
+ *
+ * It is not possible to use drive_put_ref() from a callback function when the
+ * callers still need the drive. In such cases we schedule a BH to release the
+ * reference.
+ */
+static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
+{
+ DrivePutRefBH *s;
+
+ s = g_new(DrivePutRefBH, 1);
+ s->bh = qemu_bh_new(drive_put_ref_bh, s);
+ s->dinfo = dinfo;
+ qemu_bh_schedule(s->bh);
+}
+
static int parse_block_error_action(const char *buf, int is_read)
{
if (!strcmp(buf, "ignore")) {
dinfo->unit = unit_id;
dinfo->opts = opts;
dinfo->refcount = 1;
- if (serial)
- strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
+ if (serial) {
+ pstrcpy(dinfo->serial, sizeof(dinfo->serial), serial);
+ }
QTAILQ_INSERT_TAIL(&drives, dinfo, next);
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
break;
case IF_VIRTIO:
/* add virtio block device */
- opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
- qemu_opt_set(opts, "driver", "virtio-blk");
+ opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL);
+ if (arch_type == QEMU_ARCH_S390X) {
+ qemu_opt_set(opts, "driver", "virtio-blk-s390");
+ } else {
+ qemu_opt_set(opts, "driver", "virtio-blk-pci");
+ }
qemu_opt_set(opts, "drive", dinfo->id);
if (devaddr)
qemu_opt_set(opts, "addr", devaddr);
bdrv_flags |= BDRV_O_COPY_ON_READ;
}
+ if (runstate_check(RUN_STATE_INMIGRATE)) {
+ bdrv_flags |= BDRV_O_INCOMING;
+ }
+
if (media == MEDIA_CDROM) {
/* CDROM is fine for any interface, don't check. */
ro = 1;
} else if (ro == 1) {
- if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
+ if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
+ type != IF_NONE && type != IF_PFLASH) {
error_report("readonly not supported by this bus type");
goto err;
}
{
const char *device = qdict_get_str(qdict, "device");
BlockDriverState *bs;
+ int ret;
if (!strcmp(device, "all")) {
- bdrv_commit_all();
+ ret = bdrv_commit_all();
+ if (ret == -EBUSY) {
+ qerror_report(QERR_DEVICE_IN_USE, device);
+ return;
+ }
} else {
bs = bdrv_find(device);
if (!bs) {
qerror_report(QERR_DEVICE_NOT_FOUND, device);
return;
}
- bdrv_commit(bs);
+ ret = bdrv_commit(bs);
+ if (ret == -EBUSY) {
+ qerror_report(QERR_DEVICE_IN_USE, device);
+ return;
+ }
}
}
+static void blockdev_do_action(int kind, void *data, Error **errp)
+{
+ BlockdevAction action;
+ BlockdevActionList list;
+
+ action.kind = kind;
+ action.data = data;
+ list.value = &action;
+ list.next = NULL;
+ qmp_transaction(&list, errp);
+}
+
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
bool has_format, const char *format,
+ bool has_mode, enum NewImageMode mode,
Error **errp)
{
- BlockDriverState *bs;
- BlockDriver *drv, *old_drv, *proto_drv;
+ BlockdevSnapshot snapshot = {
+ .device = (char *) device,
+ .snapshot_file = (char *) snapshot_file,
+ .has_format = has_format,
+ .format = (char *) format,
+ .has_mode = has_mode,
+ .mode = mode,
+ };
+ blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
+ errp);
+}
+
+
+/* New and old BlockDriverState structs for group snapshots */
+typedef struct BlkTransactionStates {
+ BlockDriverState *old_bs;
+ BlockDriverState *new_bs;
+ QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
+} BlkTransactionStates;
+
+/*
+ * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
+ * then we do not pivot any of the devices in the group, and abandon the
+ * snapshots
+ */
+void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
+{
int ret = 0;
- int flags;
- char old_filename[1024];
+ BlockdevActionList *dev_entry = dev_list;
+ BlkTransactionStates *states, *next;
- bs = bdrv_find(device);
- if (!bs) {
- error_set(errp, QERR_DEVICE_NOT_FOUND, device);
- return;
- }
+ QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
+ QSIMPLEQ_INIT(&snap_bdrv_states);
- pstrcpy(old_filename, sizeof(old_filename), bs->filename);
+ /* drain all i/o before any snapshots */
+ bdrv_drain_all();
- old_drv = bs->drv;
- flags = bs->open_flags;
+ /* We don't do anything in this loop that commits us to the snapshot */
+ while (NULL != dev_entry) {
+ BlockdevAction *dev_info = NULL;
+ BlockDriver *proto_drv;
+ BlockDriver *drv;
+ int flags;
+ enum NewImageMode mode;
+ const char *new_image_file;
+ const char *device;
+ const char *format = "qcow2";
+
+ dev_info = dev_entry->value;
+ dev_entry = dev_entry->next;
+
+ states = g_malloc0(sizeof(BlkTransactionStates));
+ QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
+
+ switch (dev_info->kind) {
+ case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
+ device = dev_info->blockdev_snapshot_sync->device;
+ if (!dev_info->blockdev_snapshot_sync->has_mode) {
+ dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ }
+ new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
+ if (dev_info->blockdev_snapshot_sync->has_format) {
+ format = dev_info->blockdev_snapshot_sync->format;
+ }
+ mode = dev_info->blockdev_snapshot_sync->mode;
+ break;
+ default:
+ abort();
+ }
- if (!has_format) {
- format = "qcow2";
- }
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ goto delete_and_fail;
+ }
- drv = bdrv_find_format(format);
- if (!drv) {
- error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
- return;
- }
+ states->old_bs = bdrv_find(device);
+ if (!states->old_bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ goto delete_and_fail;
+ }
- proto_drv = bdrv_find_protocol(snapshot_file);
- if (!proto_drv) {
- error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
- return;
+ if (!bdrv_is_inserted(states->old_bs)) {
+ error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ goto delete_and_fail;
+ }
+
+ if (bdrv_in_use(states->old_bs)) {
+ error_set(errp, QERR_DEVICE_IN_USE, device);
+ goto delete_and_fail;
+ }
+
+ if (!bdrv_is_read_only(states->old_bs)) {
+ if (bdrv_flush(states->old_bs)) {
+ error_set(errp, QERR_IO_ERROR);
+ goto delete_and_fail;
+ }
+ }
+
+ flags = states->old_bs->open_flags;
+
+ proto_drv = bdrv_find_protocol(new_image_file);
+ if (!proto_drv) {
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ goto delete_and_fail;
+ }
+
+ /* create new image w/backing file */
+ if (mode != NEW_IMAGE_MODE_EXISTING) {
+ ret = bdrv_img_create(new_image_file, format,
+ states->old_bs->filename,
+ states->old_bs->drv->format_name,
+ NULL, -1, flags);
+ if (ret) {
+ error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
+ goto delete_and_fail;
+ }
+ }
+
+ /* We will manually add the backing_hd field to the bs later */
+ states->new_bs = bdrv_new("");
+ ret = bdrv_open(states->new_bs, new_image_file,
+ flags | BDRV_O_NO_BACKING, drv);
+ if (ret != 0) {
+ error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
+ goto delete_and_fail;
+ }
}
- ret = bdrv_img_create(snapshot_file, format, bs->filename,
- bs->drv->format_name, NULL, -1, flags);
- if (ret) {
- error_set(errp, QERR_UNDEFINED_ERROR);
- return;
+
+ /* Now we are going to do the actual pivot. Everything up to this point
+ * is reversible, but we are committed at this point */
+ QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
+ /* This removes our old bs from the bdrv_states, and adds the new bs */
+ bdrv_append(states->new_bs, states->old_bs);
}
- bdrv_drain_all();
- bdrv_flush(bs);
+ /* success */
+ goto exit;
- bdrv_close(bs);
- ret = bdrv_open(bs, snapshot_file, flags, drv);
+delete_and_fail:
/*
- * If reopening the image file we just created fails, fall back
- * and try to re-open the original image. If that fails too, we
- * are in serious trouble.
- */
- if (ret != 0) {
- ret = bdrv_open(bs, old_filename, flags, old_drv);
- if (ret != 0) {
- error_set(errp, QERR_OPEN_FILE_FAILED, old_filename);
- } else {
- error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file);
+ * failure, and it is all-or-none; abandon each new bs, and keep using
+ * the original bs for all images
+ */
+ QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
+ if (states->new_bs) {
+ bdrv_delete(states->new_bs);
}
}
+exit:
+ QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
+ g_free(states);
+ }
+ return;
}
+
static void eject_device(BlockDriverState *bs, int force, Error **errp)
{
+ if (bdrv_in_use(bs)) {
+ error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
+ return;
+ }
if (!bdrv_dev_has_removable_media(bs)) {
error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
return;
break;
}
}
+
+static QObject *qobject_from_block_job(BlockJob *job)
+{
+ return qobject_from_jsonf("{ 'type': %s,"
+ "'device': %s,"
+ "'len': %" PRId64 ","
+ "'offset': %" PRId64 ","
+ "'speed': %" PRId64 " }",
+ job->job_type->job_type,
+ bdrv_get_device_name(job->bs),
+ job->len,
+ job->offset,
+ job->speed);
+}
+
+static void block_stream_cb(void *opaque, int ret)
+{
+ BlockDriverState *bs = opaque;
+ QObject *obj;
+
+ trace_block_stream_cb(bs, bs->job, ret);
+
+ assert(bs->job);
+ obj = qobject_from_block_job(bs->job);
+ if (ret < 0) {
+ QDict *dict = qobject_to_qdict(obj);
+ qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
+ }
+
+ if (block_job_is_cancelled(bs->job)) {
+ monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
+ } else {
+ monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
+ }
+ qobject_decref(obj);
+
+ drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
+}
+
+void qmp_block_stream(const char *device, bool has_base,
+ const char *base, bool has_speed,
+ int64_t speed, Error **errp)
+{
+ BlockDriverState *bs;
+ BlockDriverState *base_bs = NULL;
+ Error *local_err = NULL;
+
+ bs = bdrv_find(device);
+ if (!bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
+ }
+
+ if (base) {
+ base_bs = bdrv_find_backing_image(bs, base);
+ if (base_bs == NULL) {
+ error_set(errp, QERR_BASE_NOT_FOUND, base);
+ return;
+ }
+ }
+
+ stream_start(bs, base_bs, base, has_speed ? speed : 0,
+ block_stream_cb, bs, &local_err);
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ /* Grab a reference so hotplug does not delete the BlockDriverState from
+ * underneath us.
+ */
+ drive_get_ref(drive_get_by_blockdev(bs));
+
+ trace_qmp_block_stream(bs, bs->job);
+}
+
+static BlockJob *find_block_job(const char *device)
+{
+ BlockDriverState *bs;
+
+ bs = bdrv_find(device);
+ if (!bs || !bs->job) {
+ return NULL;
+ }
+ return bs->job;
+}
+
+void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
+{
+ BlockJob *job = find_block_job(device);
+
+ if (!job) {
+ error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
+ return;
+ }
+
+ block_job_set_speed(job, speed, errp);
+}
+
+void qmp_block_job_cancel(const char *device, Error **errp)
+{
+ BlockJob *job = find_block_job(device);
+
+ if (!job) {
+ error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
+ return;
+ }
+
+ trace_qmp_block_job_cancel(job);
+ block_job_cancel(job);
+}
+
+static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
+{
+ BlockJobInfoList **prev = opaque;
+ BlockJob *job = bs->job;
+
+ if (job) {
+ BlockJobInfoList *elem;
+ BlockJobInfo *info = g_new(BlockJobInfo, 1);
+ *info = (BlockJobInfo){
+ .type = g_strdup(job->job_type->job_type),
+ .device = g_strdup(bdrv_get_device_name(bs)),
+ .len = job->len,
+ .offset = job->offset,
+ .speed = job->speed,
+ };
+
+ elem = g_new0(BlockJobInfoList, 1);
+ elem->value = info;
+
+ (*prev)->next = elem;
+ *prev = elem;
+ }
+}
+
+BlockJobInfoList *qmp_query_block_jobs(Error **errp)
+{
+ /* Dummy is a fake list element for holding the head pointer */
+ BlockJobInfoList dummy = {};
+ BlockJobInfoList *prev = &dummy;
+ bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
+ return dummy.next;
+}
projects / qemu.git / blobdiff