Adding qemu as a submodule of KVMFORNFV

This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>

1 files changed, 0 insertions, 1635 deletions

diff --git a/qemu/block/block-backend.c b/qemu/block/block-backend.c
deleted file mode 100644
index 16c9d5e0f..000000000
--- a/qemu/block/block-backend.c
+++ /dev/null
@@ -1,1635 +0,0 @@
-/*
- * QEMU Block backends
- *
- * Copyright (C) 2014 Red Hat, Inc.
- *
- * Authors:
- *  Markus Armbruster <armbru@redhat.com>,
- *
- * This work is licensed under the terms of the GNU LGPL, version 2.1
- * or later.  See the COPYING.LIB file in the top-level directory.
- */
-
-#include "qemu/osdep.h"
-#include "sysemu/block-backend.h"
-#include "block/block_int.h"
-#include "block/blockjob.h"
-#include "block/throttle-groups.h"
-#include "sysemu/blockdev.h"
-#include "sysemu/sysemu.h"
-#include "qapi-event.h"
-#include "qemu/id.h"
-
-/* Number of coroutines to reserve per attached device model */
-#define COROUTINE_POOL_RESERVATION 64
-
-#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
-
-static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb);
-
-struct BlockBackend {
-    char *name;
-    int refcnt;
-    BdrvChild *root;
-    DriveInfo *legacy_dinfo;    /* null unless created by drive_new() */
-    QTAILQ_ENTRY(BlockBackend) link;         /* for block_backends */
-    QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */
-
-    void *dev;                  /* attached device model, if any */
-    /* TODO change to DeviceState when all users are qdevified */
-    const BlockDevOps *dev_ops;
-    void *dev_opaque;
-
-    /* the block size for which the guest device expects atomicity */
-    int guest_block_size;
-
-    /* If the BDS tree is removed, some of its options are stored here (which
-     * can be used to restore those options in the new BDS on insert) */
-    BlockBackendRootState root_state;
-
-    bool enable_write_cache;
-
-    /* I/O stats (display with "info blockstats"). */
-    BlockAcctStats stats;
-
-    BlockdevOnError on_read_error, on_write_error;
-    bool iostatus_enabled;
-    BlockDeviceIoStatus iostatus;
-
-    bool allow_write_beyond_eof;
-
-    NotifierList remove_bs_notifiers, insert_bs_notifiers;
-};
-
-typedef struct BlockBackendAIOCB {
-    BlockAIOCB common;
-    QEMUBH *bh;
-    BlockBackend *blk;
-    int ret;
-} BlockBackendAIOCB;
-
-static const AIOCBInfo block_backend_aiocb_info = {
-    .get_aio_context = blk_aiocb_get_aio_context,
-    .aiocb_size = sizeof(BlockBackendAIOCB),
-};
-
-static void drive_info_del(DriveInfo *dinfo);
-
-/* All BlockBackends */
-static QTAILQ_HEAD(, BlockBackend) block_backends =
-    QTAILQ_HEAD_INITIALIZER(block_backends);
-
-/* All BlockBackends referenced by the monitor and which are iterated through by
- * blk_next() */
-static QTAILQ_HEAD(, BlockBackend) monitor_block_backends =
-    QTAILQ_HEAD_INITIALIZER(monitor_block_backends);
-
-static void blk_root_inherit_options(int *child_flags, QDict *child_options,
-                                     int parent_flags, QDict *parent_options)
-{
-    /* We're not supposed to call this function for root nodes */
-    abort();
-}
-
-static const BdrvChildRole child_root = {
-    .inherit_options = blk_root_inherit_options,
-};
-
-/*
- * Create a new BlockBackend with a reference count of one.
- * Store an error through @errp on failure, unless it's null.
- * Return the new BlockBackend on success, null on failure.
- */
-BlockBackend *blk_new(Error **errp)
-{
-    BlockBackend *blk;
-
-    blk = g_new0(BlockBackend, 1);
-    blk->refcnt = 1;
-    notifier_list_init(&blk->remove_bs_notifiers);
-    notifier_list_init(&blk->insert_bs_notifiers);
-    QTAILQ_INSERT_TAIL(&block_backends, blk, link);
-    return blk;
-}
-
-/*
- * Create a new BlockBackend with a new BlockDriverState attached.
- * Otherwise just like blk_new(), which see.
- */
-BlockBackend *blk_new_with_bs(Error **errp)
-{
-    BlockBackend *blk;
-    BlockDriverState *bs;
-
-    blk = blk_new(errp);
-    if (!blk) {
-        return NULL;
-    }
-
-    bs = bdrv_new_root();
-    blk->root = bdrv_root_attach_child(bs, "root", &child_root);
-    bs->blk = blk;
-    return blk;
-}
-
-/*
- * Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState.
- *
- * Just as with bdrv_open(), after having called this function the reference to
- * @options belongs to the block layer (even on failure).
- *
- * TODO: Remove @filename and @flags; it should be possible to specify a whole
- * BDS tree just by specifying the @options QDict (or @reference,
- * alternatively). At the time of adding this function, this is not possible,
- * though, so callers of this function have to be able to specify @filename and
- * @flags.
- */
-BlockBackend *blk_new_open(const char *filename, const char *reference,
-                           QDict *options, int flags, Error **errp)
-{
-    BlockBackend *blk;
-    int ret;
-
-    blk = blk_new_with_bs(errp);
-    if (!blk) {
-        QDECREF(options);
-        return NULL;
-    }
-
-    ret = bdrv_open(&blk->root->bs, filename, reference, options, flags, errp);
-    if (ret < 0) {
-        blk_unref(blk);
-        return NULL;
-    }
-
-    blk_set_enable_write_cache(blk, true);
-
-    return blk;
-}
-
-static void blk_delete(BlockBackend *blk)
-{
-    assert(!blk->refcnt);
-    assert(!blk->name);
-    assert(!blk->dev);
-    if (blk->root) {
-        blk_remove_bs(blk);
-    }
-    assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers));
-    assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers));
-    if (blk->root_state.throttle_state) {
-        g_free(blk->root_state.throttle_group);
-        throttle_group_unref(blk->root_state.throttle_state);
-    }
-    QTAILQ_REMOVE(&block_backends, blk, link);
-    drive_info_del(blk->legacy_dinfo);
-    block_acct_cleanup(&blk->stats);
-    g_free(blk);
-}
-
-static void drive_info_del(DriveInfo *dinfo)
-{
-    if (!dinfo) {
-        return;
-    }
-    qemu_opts_del(dinfo->opts);
-    g_free(dinfo->serial);
-    g_free(dinfo);
-}
-
-int blk_get_refcnt(BlockBackend *blk)
-{
-    return blk ? blk->refcnt : 0;
-}
-
-/*
- * Increment @blk's reference count.
- * @blk must not be null.
- */
-void blk_ref(BlockBackend *blk)
-{
-    blk->refcnt++;
-}
-
-/*
- * Decrement @blk's reference count.
- * If this drops it to zero, destroy @blk.
- * For convenience, do nothing if @blk is null.
- */
-void blk_unref(BlockBackend *blk)
-{
-    if (blk) {
-        assert(blk->refcnt > 0);
-        if (!--blk->refcnt) {
-            blk_delete(blk);
-        }
-    }
-}
-
-/*
- * Behaves similarly to blk_next() but iterates over all BlockBackends, even the
- * ones which are hidden (i.e. are not referenced by the monitor).
- */
-static BlockBackend *blk_all_next(BlockBackend *blk)
-{
-    return blk ? QTAILQ_NEXT(blk, link)
-               : QTAILQ_FIRST(&block_backends);
-}
-
-void blk_remove_all_bs(void)
-{
-    BlockBackend *blk = NULL;
-
-    while ((blk = blk_all_next(blk)) != NULL) {
-        AioContext *ctx = blk_get_aio_context(blk);
-
-        aio_context_acquire(ctx);
-        if (blk->root) {
-            blk_remove_bs(blk);
-        }
-        aio_context_release(ctx);
-    }
-}
-
-/*
- * Return the monitor-owned BlockBackend after @blk.
- * If @blk is null, return the first one.
- * Else, return @blk's next sibling, which may be null.
- *
- * To iterate over all BlockBackends, do
- * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
- *     ...
- * }
- */
-BlockBackend *blk_next(BlockBackend *blk)
-{
-    return blk ? QTAILQ_NEXT(blk, monitor_link)
-               : QTAILQ_FIRST(&monitor_block_backends);
-}
-
-/*
- * Iterates over all BlockDriverStates which are attached to a BlockBackend.
- * This function is for use by bdrv_next().
- *
- * @bs must be NULL or a BDS that is attached to a BB.
- */
-BlockDriverState *blk_next_root_bs(BlockDriverState *bs)
-{
-    BlockBackend *blk;
-
-    if (bs) {
-        assert(bs->blk);
-        blk = bs->blk;
-    } else {
-        blk = NULL;
-    }
-
-    do {
-        blk = blk_all_next(blk);
-    } while (blk && !blk->root);
-
-    return blk ? blk->root->bs : NULL;
-}
-
-/*
- * Add a BlockBackend into the list of backends referenced by the monitor, with
- * the given @name acting as the handle for the monitor.
- * Strictly for use by blockdev.c.
- *
- * @name must not be null or empty.
- *
- * Returns true on success and false on failure. In the latter case, an Error
- * object is returned through @errp.
- */
-bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp)
-{
-    assert(!blk->name);
-    assert(name && name[0]);
-
-    if (!id_wellformed(name)) {
-        error_setg(errp, "Invalid device name");
-        return false;
-    }
-    if (blk_by_name(name)) {
-        error_setg(errp, "Device with id '%s' already exists", name);
-        return false;
-    }
-    if (bdrv_find_node(name)) {
-        error_setg(errp,
-                   "Device name '%s' conflicts with an existing node name",
-                   name);
-        return false;
-    }
-
-    blk->name = g_strdup(name);
-    QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link);
-    return true;
-}
-
-/*
- * Remove a BlockBackend from the list of backends referenced by the monitor.
- * Strictly for use by blockdev.c.
- */
-void monitor_remove_blk(BlockBackend *blk)
-{
-    if (!blk->name) {
-        return;
-    }
-
-    QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link);
-    g_free(blk->name);
-    blk->name = NULL;
-}
-
-/*
- * Return @blk's name, a non-null string.
- * Returns an empty string iff @blk is not referenced by the monitor.
- */
-const char *blk_name(BlockBackend *blk)
-{
-    return blk->name ?: "";
-}
-
-/*
- * Return the BlockBackend with name @name if it exists, else null.
- * @name must not be null.
- */
-BlockBackend *blk_by_name(const char *name)
-{
-    BlockBackend *blk = NULL;
-
-    assert(name);
-    while ((blk = blk_next(blk)) != NULL) {
-        if (!strcmp(name, blk->name)) {
-            return blk;
-        }
-    }
-    return NULL;
-}
-
-/*
- * Return the BlockDriverState attached to @blk if any, else null.
- */
-BlockDriverState *blk_bs(BlockBackend *blk)
-{
-    return blk->root ? blk->root->bs : NULL;
-}
-
-/*
- * Return @blk's DriveInfo if any, else null.
- */
-DriveInfo *blk_legacy_dinfo(BlockBackend *blk)
-{
-    return blk->legacy_dinfo;
-}
-
-/*
- * Set @blk's DriveInfo to @dinfo, and return it.
- * @blk must not have a DriveInfo set already.
- * No other BlockBackend may have the same DriveInfo set.
- */
-DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo)
-{
-    assert(!blk->legacy_dinfo);
-    return blk->legacy_dinfo = dinfo;
-}
-
-/*
- * Return the BlockBackend with DriveInfo @dinfo.
- * It must exist.
- */
-BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo)
-{
-    BlockBackend *blk = NULL;
-
-    while ((blk = blk_next(blk)) != NULL) {
-        if (blk->legacy_dinfo == dinfo) {
-            return blk;
-        }
-    }
-    abort();
-}
-
-/*
- * Disassociates the currently associated BlockDriverState from @blk.
- */
-void blk_remove_bs(BlockBackend *blk)
-{
-    assert(blk->root->bs->blk == blk);
-
-    notifier_list_notify(&blk->remove_bs_notifiers, blk);
-
-    blk_update_root_state(blk);
-
-    blk->root->bs->blk = NULL;
-    bdrv_root_unref_child(blk->root);
-    blk->root = NULL;
-}
-
-/*
- * Associates a new BlockDriverState with @blk.
- */
-void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
-{
-    assert(!blk->root && !bs->blk);
-    bdrv_ref(bs);
-    blk->root = bdrv_root_attach_child(bs, "root", &child_root);
-    bs->blk = blk;
-
-    notifier_list_notify(&blk->insert_bs_notifiers, blk);
-}
-
-/*
- * Attach device model @dev to @blk.
- * Return 0 on success, -EBUSY when a device model is attached already.
- */
-int blk_attach_dev(BlockBackend *blk, void *dev)
-/* TODO change to DeviceState *dev when all users are qdevified */
-{
-    if (blk->dev) {
-        return -EBUSY;
-    }
-    blk_ref(blk);
-    blk->dev = dev;
-    blk_iostatus_reset(blk);
-    return 0;
-}
-
-/*
- * Attach device model @dev to @blk.
- * @blk must not have a device model attached already.
- * TODO qdevified devices don't use this, remove when devices are qdevified
- */
-void blk_attach_dev_nofail(BlockBackend *blk, void *dev)
-{
-    if (blk_attach_dev(blk, dev) < 0) {
-        abort();
-    }
-}
-
-/*
- * Detach device model @dev from @blk.
- * @dev must be currently attached to @blk.
- */
-void blk_detach_dev(BlockBackend *blk, void *dev)
-/* TODO change to DeviceState *dev when all users are qdevified */
-{
-    assert(blk->dev == dev);
-    blk->dev = NULL;
-    blk->dev_ops = NULL;
-    blk->dev_opaque = NULL;
-    blk->guest_block_size = 512;
-    blk_unref(blk);
-}
-
-/*
- * Return the device model attached to @blk if any, else null.
- */
-void *blk_get_attached_dev(BlockBackend *blk)
-/* TODO change to return DeviceState * when all users are qdevified */
-{
-    return blk->dev;
-}
-
-/*
- * Set @blk's device model callbacks to @ops.
- * @opaque is the opaque argument to pass to the callbacks.
- * This is for use by device models.
- */
-void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
-                     void *opaque)
-{
-    blk->dev_ops = ops;
-    blk->dev_opaque = opaque;
-}
-
-/*
- * Notify @blk's attached device model of media change.
- * If @load is true, notify of media load.
- * Else, notify of media eject.
- * Also send DEVICE_TRAY_MOVED events as appropriate.
- */
-void blk_dev_change_media_cb(BlockBackend *blk, bool load)
-{
-    if (blk->dev_ops && blk->dev_ops->change_media_cb) {
-        bool tray_was_open, tray_is_open;
-
-        tray_was_open = blk_dev_is_tray_open(blk);
-        blk->dev_ops->change_media_cb(blk->dev_opaque, load);
-        tray_is_open = blk_dev_is_tray_open(blk);
-
-        if (tray_was_open != tray_is_open) {
-            qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open,
-                                              &error_abort);
-        }
-    }
-}
-
-/*
- * Does @blk's attached device model have removable media?
- * %true if no device model is attached.
- */
-bool blk_dev_has_removable_media(BlockBackend *blk)
-{
-    return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb);
-}
-
-/*
- * Does @blk's attached device model have a tray?
- */
-bool blk_dev_has_tray(BlockBackend *blk)
-{
-    return blk->dev_ops && blk->dev_ops->is_tray_open;
-}
-
-/*
- * Notify @blk's attached device model of a media eject request.
- * If @force is true, the medium is about to be yanked out forcefully.
- */
-void blk_dev_eject_request(BlockBackend *blk, bool force)
-{
-    if (blk->dev_ops && blk->dev_ops->eject_request_cb) {
-        blk->dev_ops->eject_request_cb(blk->dev_opaque, force);
-    }
-}
-
-/*
- * Does @blk's attached device model have a tray, and is it open?
- */
-bool blk_dev_is_tray_open(BlockBackend *blk)
-{
-    if (blk_dev_has_tray(blk)) {
-        return blk->dev_ops->is_tray_open(blk->dev_opaque);
-    }
-    return false;
-}
-
-/*
- * Does @blk's attached device model have the medium locked?
- * %false if the device model has no such lock.
- */
-bool blk_dev_is_medium_locked(BlockBackend *blk)
-{
-    if (blk->dev_ops && blk->dev_ops->is_medium_locked) {
-        return blk->dev_ops->is_medium_locked(blk->dev_opaque);
-    }
-    return false;
-}
-
-/*
- * Notify @blk's attached device model of a backend size change.
- */
-void blk_dev_resize_cb(BlockBackend *blk)
-{
-    if (blk->dev_ops && blk->dev_ops->resize_cb) {
-        blk->dev_ops->resize_cb(blk->dev_opaque);
-    }
-}
-
-void blk_iostatus_enable(BlockBackend *blk)
-{
-    blk->iostatus_enabled = true;
-    blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
-}
-
-/* The I/O status is only enabled if the drive explicitly
- * enables it _and_ the VM is configured to stop on errors */
-bool blk_iostatus_is_enabled(const BlockBackend *blk)
-{
-    return (blk->iostatus_enabled &&
-           (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
-            blk->on_write_error == BLOCKDEV_ON_ERROR_STOP   ||
-            blk->on_read_error == BLOCKDEV_ON_ERROR_STOP));
-}
-
-BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk)
-{
-    return blk->iostatus;
-}
-
-void blk_iostatus_disable(BlockBackend *blk)
-{
-    blk->iostatus_enabled = false;
-}
-
-void blk_iostatus_reset(BlockBackend *blk)
-{
-    if (blk_iostatus_is_enabled(blk)) {
-        BlockDriverState *bs = blk_bs(blk);
-        blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
-        if (bs && bs->job) {
-            block_job_iostatus_reset(bs->job);
-        }
-    }
-}
-
-void blk_iostatus_set_err(BlockBackend *blk, int error)
-{
-    assert(blk_iostatus_is_enabled(blk));
-    if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
-        blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
-                                          BLOCK_DEVICE_IO_STATUS_FAILED;
-    }
-}
-
-void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow)
-{
-    blk->allow_write_beyond_eof = allow;
-}
-
-static int blk_check_byte_request(BlockBackend *blk, int64_t offset,
-                                  size_t size)
-{
-    int64_t len;
-
-    if (size > INT_MAX) {
-        return -EIO;
-    }
-
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    if (offset < 0) {
-        return -EIO;
-    }
-
-    if (!blk->allow_write_beyond_eof) {
-        len = blk_getlength(blk);
-        if (len < 0) {
-            return len;
-        }
-
-        if (offset > len || len - offset < size) {
-            return -EIO;
-        }
-    }
-
-    return 0;
-}
-
-static int blk_check_request(BlockBackend *blk, int64_t sector_num,
-                             int nb_sectors)
-{
-    if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) {
-        return -EIO;
-    }
-
-    if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
-        return -EIO;
-    }
-
-    return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE,
-                                  nb_sectors * BDRV_SECTOR_SIZE);
-}
-
-static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
-                                      unsigned int bytes, QEMUIOVector *qiov,
-                                      BdrvRequestFlags flags)
-{
-    int ret = blk_check_byte_request(blk, offset, bytes);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return bdrv_co_do_preadv(blk_bs(blk), offset, bytes, qiov, flags);
-}
-
-static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
-                                      unsigned int bytes, QEMUIOVector *qiov,
-                                      BdrvRequestFlags flags)
-{
-    int ret;
-
-    ret = blk_check_byte_request(blk, offset, bytes);
-    if (ret < 0) {
-        return ret;
-    }
-
-    if (!blk->enable_write_cache) {
-        flags |= BDRV_REQ_FUA;
-    }
-
-    return bdrv_co_do_pwritev(blk_bs(blk), offset, bytes, qiov, flags);
-}
-
-typedef struct BlkRwCo {
-    BlockBackend *blk;
-    int64_t offset;
-    QEMUIOVector *qiov;
-    int ret;
-    BdrvRequestFlags flags;
-} BlkRwCo;
-
-static void blk_read_entry(void *opaque)
-{
-    BlkRwCo *rwco = opaque;
-
-    rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size,
-                              rwco->qiov, rwco->flags);
-}
-
-static void blk_write_entry(void *opaque)
-{
-    BlkRwCo *rwco = opaque;
-
-    rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size,
-                               rwco->qiov, rwco->flags);
-}
-
-static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf,
-                   int64_t bytes, CoroutineEntry co_entry,
-                   BdrvRequestFlags flags)
-{
-    AioContext *aio_context;
-    QEMUIOVector qiov;
-    struct iovec iov;
-    Coroutine *co;
-    BlkRwCo rwco;
-
-    iov = (struct iovec) {
-        .iov_base = buf,
-        .iov_len = bytes,
-    };
-    qemu_iovec_init_external(&qiov, &iov, 1);
-
-    rwco = (BlkRwCo) {
-        .blk    = blk,
-        .offset = offset,
-        .qiov   = &qiov,
-        .flags  = flags,
-        .ret    = NOT_DONE,
-    };
-
-    co = qemu_coroutine_create(co_entry);
-    qemu_coroutine_enter(co, &rwco);
-
-    aio_context = blk_get_aio_context(blk);
-    while (rwco.ret == NOT_DONE) {
-        aio_poll(aio_context, true);
-    }
-
-    return rwco.ret;
-}
-
-static int blk_rw(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
-                  int nb_sectors, CoroutineEntry co_entry,
-                  BdrvRequestFlags flags)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return -EINVAL;
-    }
-
-    return blk_prw(blk, sector_num << BDRV_SECTOR_BITS, buf,
-                   nb_sectors << BDRV_SECTOR_BITS, co_entry, flags);
-}
-
-int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
-             int nb_sectors)
-{
-    return blk_rw(blk, sector_num, buf, nb_sectors, blk_read_entry, 0);
-}
-
-int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
-                         int nb_sectors)
-{
-    BlockDriverState *bs = blk_bs(blk);
-    bool enabled;
-    int ret;
-
-    ret = blk_check_request(blk, sector_num, nb_sectors);
-    if (ret < 0) {
-        return ret;
-    }
-
-    enabled = bs->io_limits_enabled;
-    bs->io_limits_enabled = false;
-    ret = blk_read(blk, sector_num, buf, nb_sectors);
-    bs->io_limits_enabled = enabled;
-    return ret;
-}
-
-int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
-              int nb_sectors)
-{
-    return blk_rw(blk, sector_num, (uint8_t*) buf, nb_sectors,
-                  blk_write_entry, 0);
-}
-
-int blk_write_zeroes(BlockBackend *blk, int64_t sector_num,
-                     int nb_sectors, BdrvRequestFlags flags)
-{
-    return blk_rw(blk, sector_num, NULL, nb_sectors, blk_write_entry,
-                  flags | BDRV_REQ_ZERO_WRITE);
-}
-
-static void error_callback_bh(void *opaque)
-{
-    struct BlockBackendAIOCB *acb = opaque;
-    qemu_bh_delete(acb->bh);
-    acb->common.cb(acb->common.opaque, acb->ret);
-    qemu_aio_unref(acb);
-}
-
-BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
-                                  BlockCompletionFunc *cb,
-                                  void *opaque, int ret)
-{
-    struct BlockBackendAIOCB *acb;
-    QEMUBH *bh;
-
-    acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
-    acb->blk = blk;
-    acb->ret = ret;
-
-    bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb);
-    acb->bh = bh;
-    qemu_bh_schedule(bh);
-
-    return &acb->common;
-}
-
-typedef struct BlkAioEmAIOCB {
-    BlockAIOCB common;
-    BlkRwCo rwco;
-    int bytes;
-    bool has_returned;
-    QEMUBH* bh;
-} BlkAioEmAIOCB;
-
-static const AIOCBInfo blk_aio_em_aiocb_info = {
-    .aiocb_size         = sizeof(BlkAioEmAIOCB),
-};
-
-static void blk_aio_complete(BlkAioEmAIOCB *acb)
-{
-    if (acb->bh) {
-        assert(acb->has_returned);
-        qemu_bh_delete(acb->bh);
-    }
-    if (acb->has_returned) {
-        acb->common.cb(acb->common.opaque, acb->rwco.ret);
-        qemu_aio_unref(acb);
-    }
-}
-
-static void blk_aio_complete_bh(void *opaque)
-{
-    blk_aio_complete(opaque);
-}
-
-static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes,
-                                QEMUIOVector *qiov, CoroutineEntry co_entry,
-                                BdrvRequestFlags flags,
-                                BlockCompletionFunc *cb, void *opaque)
-{
-    BlkAioEmAIOCB *acb;
-    Coroutine *co;
-
-    acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque);
-    acb->rwco = (BlkRwCo) {
-        .blk    = blk,
-        .offset = offset,
-        .qiov   = qiov,
-        .flags  = flags,
-        .ret    = NOT_DONE,
-    };
-    acb->bytes = bytes;
-    acb->bh = NULL;
-    acb->has_returned = false;
-
-    co = qemu_coroutine_create(co_entry);
-    qemu_coroutine_enter(co, acb);
-
-    acb->has_returned = true;
-    if (acb->rwco.ret != NOT_DONE) {
-        acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb);
-        qemu_bh_schedule(acb->bh);
-    }
-
-    return &acb->common;
-}
-
-static void blk_aio_read_entry(void *opaque)
-{
-    BlkAioEmAIOCB *acb = opaque;
-    BlkRwCo *rwco = &acb->rwco;
-
-    assert(rwco->qiov->size == acb->bytes);
-    rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes,
-                              rwco->qiov, rwco->flags);
-    blk_aio_complete(acb);
-}
-
-static void blk_aio_write_entry(void *opaque)
-{
-    BlkAioEmAIOCB *acb = opaque;
-    BlkRwCo *rwco = &acb->rwco;
-
-    assert(!rwco->qiov || rwco->qiov->size == acb->bytes);
-    rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes,
-                               rwco->qiov, rwco->flags);
-    blk_aio_complete(acb);
-}
-
-BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
-                                 int nb_sectors, BdrvRequestFlags flags,
-                                 BlockCompletionFunc *cb, void *opaque)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
-    }
-
-    return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS,
-                        nb_sectors << BDRV_SECTOR_BITS, NULL,
-                        blk_aio_write_entry, flags | BDRV_REQ_ZERO_WRITE,
-                        cb, opaque);
-}
-
-int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count)
-{
-    int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0);
-    if (ret < 0) {
-        return ret;
-    }
-    return count;
-}
-
-int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count)
-{
-    int ret = blk_prw(blk, offset, (void*) buf, count, blk_write_entry, 0);
-    if (ret < 0) {
-        return ret;
-    }
-    return count;
-}
-
-int64_t blk_getlength(BlockBackend *blk)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_getlength(blk_bs(blk));
-}
-
-void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
-{
-    if (!blk_bs(blk)) {
-        *nb_sectors_ptr = 0;
-    } else {
-        bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr);
-    }
-}
-
-int64_t blk_nb_sectors(BlockBackend *blk)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_nb_sectors(blk_bs(blk));
-}
-
-BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
-                          QEMUIOVector *iov, int nb_sectors,
-                          BlockCompletionFunc *cb, void *opaque)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
-    }
-
-    assert(nb_sectors << BDRV_SECTOR_BITS == iov->size);
-    return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov,
-                        blk_aio_read_entry, 0, cb, opaque);
-}
-
-BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
-                           QEMUIOVector *iov, int nb_sectors,
-                           BlockCompletionFunc *cb, void *opaque)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
-    }
-
-    assert(nb_sectors << BDRV_SECTOR_BITS == iov->size);
-    return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov,
-                        blk_aio_write_entry, 0, cb, opaque);
-}
-
-BlockAIOCB *blk_aio_flush(BlockBackend *blk,
-                          BlockCompletionFunc *cb, void *opaque)
-{
-    if (!blk_is_available(blk)) {
-        return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
-    }
-
-    return bdrv_aio_flush(blk_bs(blk), cb, opaque);
-}
-
-BlockAIOCB *blk_aio_discard(BlockBackend *blk,
-                            int64_t sector_num, int nb_sectors,
-                            BlockCompletionFunc *cb, void *opaque)
-{
-    int ret = blk_check_request(blk, sector_num, nb_sectors);
-    if (ret < 0) {
-        return blk_abort_aio_request(blk, cb, opaque, ret);
-    }
-
-    return bdrv_aio_discard(blk_bs(blk), sector_num, nb_sectors, cb, opaque);
-}
-
-void blk_aio_cancel(BlockAIOCB *acb)
-{
-    bdrv_aio_cancel(acb);
-}
-
-void blk_aio_cancel_async(BlockAIOCB *acb)
-{
-    bdrv_aio_cancel_async(acb);
-}
-
-int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs)
-{
-    int i, ret;
-
-    for (i = 0; i < num_reqs; i++) {
-        ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors);
-        if (ret < 0) {
-            return ret;
-        }
-    }
-
-    return bdrv_aio_multiwrite(blk_bs(blk), reqs, num_reqs);
-}
-
-int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_ioctl(blk_bs(blk), req, buf);
-}
-
-BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
-                          BlockCompletionFunc *cb, void *opaque)
-{
-    if (!blk_is_available(blk)) {
-        return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
-    }
-
-    return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque);
-}
-
-int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
-{
-    int ret = blk_check_request(blk, sector_num, nb_sectors);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return bdrv_co_discard(blk_bs(blk), sector_num, nb_sectors);
-}
-
-int blk_co_flush(BlockBackend *blk)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_co_flush(blk_bs(blk));
-}
-
-int blk_flush(BlockBackend *blk)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_flush(blk_bs(blk));
-}
-
-void blk_drain(BlockBackend *blk)
-{
-    if (blk_bs(blk)) {
-        bdrv_drain(blk_bs(blk));
-    }
-}
-
-void blk_drain_all(void)
-{
-    bdrv_drain_all();
-}
-
-void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
-                      BlockdevOnError on_write_error)
-{
-    blk->on_read_error = on_read_error;
-    blk->on_write_error = on_write_error;
-}
-
-BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read)
-{
-    return is_read ? blk->on_read_error : blk->on_write_error;
-}
-
-BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
-                                      int error)
-{
-    BlockdevOnError on_err = blk_get_on_error(blk, is_read);
-
-    switch (on_err) {
-    case BLOCKDEV_ON_ERROR_ENOSPC:
-        return (error == ENOSPC) ?
-               BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
-    case BLOCKDEV_ON_ERROR_STOP:
-        return BLOCK_ERROR_ACTION_STOP;
-    case BLOCKDEV_ON_ERROR_REPORT:
-        return BLOCK_ERROR_ACTION_REPORT;
-    case BLOCKDEV_ON_ERROR_IGNORE:
-        return BLOCK_ERROR_ACTION_IGNORE;
-    default:
-        abort();
-    }
-}
-
-static void send_qmp_error_event(BlockBackend *blk,
-                                 BlockErrorAction action,
-                                 bool is_read, int error)
-{
-    IoOperationType optype;
-
-    optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE;
-    qapi_event_send_block_io_error(blk_name(blk), optype, action,
-                                   blk_iostatus_is_enabled(blk),
-                                   error == ENOSPC, strerror(error),
-                                   &error_abort);
-}
-
-/* This is done by device models because, while the block layer knows
- * about the error, it does not know whether an operation comes from
- * the device or the block layer (from a job, for example).
- */
-void blk_error_action(BlockBackend *blk, BlockErrorAction action,
-                      bool is_read, int error)
-{
-    assert(error >= 0);
-
-    if (action == BLOCK_ERROR_ACTION_STOP) {
-        /* First set the iostatus, so that "info block" returns an iostatus
-         * that matches the events raised so far (an additional error iostatus
-         * is fine, but not a lost one).
-         */
-        blk_iostatus_set_err(blk, error);
-
-        /* Then raise the request to stop the VM and the event.
-         * qemu_system_vmstop_request_prepare has two effects.  First,
-         * it ensures that the STOP event always comes after the
-         * BLOCK_IO_ERROR event.  Second, it ensures that even if management
-         * can observe the STOP event and do a "cont" before the STOP
-         * event is issued, the VM will not stop.  In this case, vm_start()
-         * also ensures that the STOP/RESUME pair of events is emitted.
-         */
-        qemu_system_vmstop_request_prepare();
-        send_qmp_error_event(blk, action, is_read, error);
-        qemu_system_vmstop_request(RUN_STATE_IO_ERROR);
-    } else {
-        send_qmp_error_event(blk, action, is_read, error);
-    }
-}
-
-int blk_is_read_only(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        return bdrv_is_read_only(bs);
-    } else {
-        return blk->root_state.read_only;
-    }
-}
-
-int blk_is_sg(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (!bs) {
-        return 0;
-    }
-
-    return bdrv_is_sg(bs);
-}
-
-int blk_enable_write_cache(BlockBackend *blk)
-{
-    return blk->enable_write_cache;
-}
-
-void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
-{
-    blk->enable_write_cache = wce;
-}
-
-void blk_invalidate_cache(BlockBackend *blk, Error **errp)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (!bs) {
-        error_setg(errp, "Device '%s' has no medium", blk->name);
-        return;
-    }
-
-    bdrv_invalidate_cache(bs, errp);
-}
-
-bool blk_is_inserted(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    return bs && bdrv_is_inserted(bs);
-}
-
-bool blk_is_available(BlockBackend *blk)
-{
-    return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk);
-}
-
-void blk_lock_medium(BlockBackend *blk, bool locked)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_lock_medium(bs, locked);
-    }
-}
-
-void blk_eject(BlockBackend *blk, bool eject_flag)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_eject(bs, eject_flag);
-    }
-}
-
-int blk_get_flags(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        return bdrv_get_flags(bs);
-    } else {
-        return blk->root_state.open_flags;
-    }
-}
-
-int blk_get_max_transfer_length(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        return bs->bl.max_transfer_length;
-    } else {
-        return 0;
-    }
-}
-
-int blk_get_max_iov(BlockBackend *blk)
-{
-    return blk->root->bs->bl.max_iov;
-}
-
-void blk_set_guest_block_size(BlockBackend *blk, int align)
-{
-    blk->guest_block_size = align;
-}
-
-void *blk_try_blockalign(BlockBackend *blk, size_t size)
-{
-    return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size);
-}
-
-void *blk_blockalign(BlockBackend *blk, size_t size)
-{
-    return qemu_blockalign(blk ? blk_bs(blk) : NULL, size);
-}
-
-bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (!bs) {
-        return false;
-    }
-
-    return bdrv_op_is_blocked(bs, op, errp);
-}
-
-void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_op_unblock(bs, op, reason);
-    }
-}
-
-void blk_op_block_all(BlockBackend *blk, Error *reason)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_op_block_all(bs, reason);
-    }
-}
-
-void blk_op_unblock_all(BlockBackend *blk, Error *reason)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_op_unblock_all(bs, reason);
-    }
-}
-
-AioContext *blk_get_aio_context(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        return bdrv_get_aio_context(bs);
-    } else {
-        return qemu_get_aio_context();
-    }
-}
-
-static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb)
-{
-    BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb);
-    return blk_get_aio_context(blk_acb->blk);
-}
-
-void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_set_aio_context(bs, new_context);
-    }
-}
-
-void blk_add_aio_context_notifier(BlockBackend *blk,
-        void (*attached_aio_context)(AioContext *new_context, void *opaque),
-        void (*detach_aio_context)(void *opaque), void *opaque)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_add_aio_context_notifier(bs, attached_aio_context,
-                                      detach_aio_context, opaque);
-    }
-}
-
-void blk_remove_aio_context_notifier(BlockBackend *blk,
-                                     void (*attached_aio_context)(AioContext *,
-                                                                  void *),
-                                     void (*detach_aio_context)(void *),
-                                     void *opaque)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_remove_aio_context_notifier(bs, attached_aio_context,
-                                         detach_aio_context, opaque);
-    }
-}
-
-void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify)
-{
-    notifier_list_add(&blk->remove_bs_notifiers, notify);
-}
-
-void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify)
-{
-    notifier_list_add(&blk->insert_bs_notifiers, notify);
-}
-
-void blk_io_plug(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_io_plug(bs);
-    }
-}
-
-void blk_io_unplug(BlockBackend *blk)
-{
-    BlockDriverState *bs = blk_bs(blk);
-
-    if (bs) {
-        bdrv_io_unplug(bs);
-    }
-}
-
-BlockAcctStats *blk_get_stats(BlockBackend *blk)
-{
-    return &blk->stats;
-}
-
-void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
-                  BlockCompletionFunc *cb, void *opaque)
-{
-    return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque);
-}
-
-int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num,
-                                     int nb_sectors, BdrvRequestFlags flags)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return -EINVAL;
-    }
-
-    return blk_co_pwritev(blk, sector_num << BDRV_SECTOR_BITS,
-                          nb_sectors << BDRV_SECTOR_BITS, NULL,
-                          flags | BDRV_REQ_ZERO_WRITE);
-}
-
-int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
-                         const uint8_t *buf, int nb_sectors)
-{
-    int ret = blk_check_request(blk, sector_num, nb_sectors);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return bdrv_write_compressed(blk_bs(blk), sector_num, buf, nb_sectors);
-}
-
-int blk_truncate(BlockBackend *blk, int64_t offset)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_truncate(blk_bs(blk), offset);
-}
-
-int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
-{
-    int ret = blk_check_request(blk, sector_num, nb_sectors);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return bdrv_discard(blk_bs(blk), sector_num, nb_sectors);
-}
-
-int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
-                     int64_t pos, int size)
-{
-    int ret;
-
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size);
-    if (ret < 0) {
-        return ret;
-    }
-
-    if (ret == size && !blk->enable_write_cache) {
-        ret = bdrv_flush(blk_bs(blk));
-    }
-
-    return ret < 0 ? ret : size;
-}
-
-int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_load_vmstate(blk_bs(blk), buf, pos, size);
-}
-
-int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_probe_blocksizes(blk_bs(blk), bsz);
-}
-
-int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
-{
-    if (!blk_is_available(blk)) {
-        return -ENOMEDIUM;
-    }
-
-    return bdrv_probe_geometry(blk_bs(blk), geo);
-}
-
-/*
- * Updates the BlockBackendRootState object with data from the currently
- * attached BlockDriverState.
- */
-void blk_update_root_state(BlockBackend *blk)
-{
-    assert(blk->root);
-
-    blk->root_state.open_flags    = blk->root->bs->open_flags;
-    blk->root_state.read_only     = blk->root->bs->read_only;
-    blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes;
-
-    if (blk->root_state.throttle_group) {
-        g_free(blk->root_state.throttle_group);
-        throttle_group_unref(blk->root_state.throttle_state);
-    }
-    if (blk->root->bs->throttle_state) {
-        const char *name = throttle_group_get_name(blk->root->bs);
-        blk->root_state.throttle_group = g_strdup(name);
-        blk->root_state.throttle_state = throttle_group_incref(name);
-    } else {
-        blk->root_state.throttle_group = NULL;
-        blk->root_state.throttle_state = NULL;
-    }
-}
-
-/*
- * Applies the information in the root state to the given BlockDriverState. This
- * does not include the flags which have to be specified for bdrv_open(), use
- * blk_get_open_flags_from_root_state() to inquire them.
- */
-void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs)
-{
-    bs->detect_zeroes = blk->root_state.detect_zeroes;
-    if (blk->root_state.throttle_group) {
-        bdrv_io_limits_enable(bs, blk->root_state.throttle_group);
-    }
-}
-
-/*
- * Returns the flags to be used for bdrv_open() of a BlockDriverState which is
- * supposed to inherit the root state.
- */
-int blk_get_open_flags_from_root_state(BlockBackend *blk)
-{
-    int bs_flags;
-
-    bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR;
-    bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR;
-
-    return bs_flags;
-}
-
-BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
-{
-    return &blk->root_state;
-}
-
-int blk_commit_all(void)
-{
-    BlockBackend *blk = NULL;
-
-    while ((blk = blk_all_next(blk)) != NULL) {
-        AioContext *aio_context = blk_get_aio_context(blk);
-
-        aio_context_acquire(aio_context);
-        if (blk_is_inserted(blk) && blk->root->bs->backing) {
-            int ret = bdrv_commit(blk->root->bs);
-            if (ret < 0) {
-                aio_context_release(aio_context);
-                return ret;
-            }
-        }
-        aio_context_release(aio_context);
-    }
-    return 0;
-}
-
-int blk_flush_all(void)
-{
-    BlockBackend *blk = NULL;
-    int result = 0;
-
-    while ((blk = blk_all_next(blk)) != NULL) {
-        AioContext *aio_context = blk_get_aio_context(blk);
-        int ret;
-
-        aio_context_acquire(aio_context);
-        if (blk_is_inserted(blk)) {
-            ret = blk_flush(blk);
-            if (ret < 0 && !result) {
-                result = ret;
-            }
-        }
-        aio_context_release(aio_context);
-    }
-
-    return result;
-}