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, 976 deletions

diff --git a/qemu/block/mirror.c b/qemu/block/mirror.c
deleted file mode 100644
index 039f48125..000000000
--- a/qemu/block/mirror.c
+++ /dev/null
@@ -1,976 +0,0 @@
-/*
- * Image mirroring
- *
- * Copyright Red Hat, Inc. 2012
- *
- * Authors:
- *  Paolo Bonzini  <pbonzini@redhat.com>
- *
- * This work is licensed under the terms of the GNU LGPL, version 2 or later.
- * See the COPYING.LIB file in the top-level directory.
- *
- */
-
-#include "qemu/osdep.h"
-#include "trace.h"
-#include "block/blockjob.h"
-#include "block/block_int.h"
-#include "sysemu/block-backend.h"
-#include "qapi/error.h"
-#include "qapi/qmp/qerror.h"
-#include "qemu/ratelimit.h"
-#include "qemu/bitmap.h"
-#include "qemu/error-report.h"
-
-#define SLICE_TIME    100000000ULL /* ns */
-#define MAX_IN_FLIGHT 16
-#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
-
-/* The mirroring buffer is a list of granularity-sized chunks.
- * Free chunks are organized in a list.
- */
-typedef struct MirrorBuffer {
-    QSIMPLEQ_ENTRY(MirrorBuffer) next;
-} MirrorBuffer;
-
-typedef struct MirrorBlockJob {
-    BlockJob common;
-    RateLimit limit;
-    BlockDriverState *target;
-    BlockDriverState *base;
-    /* The name of the graph node to replace */
-    char *replaces;
-    /* The BDS to replace */
-    BlockDriverState *to_replace;
-    /* Used to block operations on the drive-mirror-replace target */
-    Error *replace_blocker;
-    bool is_none_mode;
-    BlockdevOnError on_source_error, on_target_error;
-    bool synced;
-    bool should_complete;
-    int64_t granularity;
-    size_t buf_size;
-    int64_t bdev_length;
-    unsigned long *cow_bitmap;
-    BdrvDirtyBitmap *dirty_bitmap;
-    HBitmapIter hbi;
-    uint8_t *buf;
-    QSIMPLEQ_HEAD(, MirrorBuffer) buf_free;
-    int buf_free_count;
-
-    unsigned long *in_flight_bitmap;
-    int in_flight;
-    int sectors_in_flight;
-    int ret;
-    bool unmap;
-    bool waiting_for_io;
-    int target_cluster_sectors;
-    int max_iov;
-} MirrorBlockJob;
-
-typedef struct MirrorOp {
-    MirrorBlockJob *s;
-    QEMUIOVector qiov;
-    int64_t sector_num;
-    int nb_sectors;
-} MirrorOp;
-
-static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read,
-                                            int error)
-{
-    s->synced = false;
-    if (read) {
-        return block_job_error_action(&s->common, s->common.bs,
-                                      s->on_source_error, true, error);
-    } else {
-        return block_job_error_action(&s->common, s->target,
-                                      s->on_target_error, false, error);
-    }
-}
-
-static void mirror_iteration_done(MirrorOp *op, int ret)
-{
-    MirrorBlockJob *s = op->s;
-    struct iovec *iov;
-    int64_t chunk_num;
-    int i, nb_chunks, sectors_per_chunk;
-
-    trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret);
-
-    s->in_flight--;
-    s->sectors_in_flight -= op->nb_sectors;
-    iov = op->qiov.iov;
-    for (i = 0; i < op->qiov.niov; i++) {
-        MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base;
-        QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next);
-        s->buf_free_count++;
-    }
-
-    sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
-    chunk_num = op->sector_num / sectors_per_chunk;
-    nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk);
-    bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks);
-    if (ret >= 0) {
-        if (s->cow_bitmap) {
-            bitmap_set(s->cow_bitmap, chunk_num, nb_chunks);
-        }
-        s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE;
-    }
-
-    qemu_iovec_destroy(&op->qiov);
-    g_free(op);
-
-    if (s->waiting_for_io) {
-        qemu_coroutine_enter(s->common.co, NULL);
-    }
-}
-
-static void mirror_write_complete(void *opaque, int ret)
-{
-    MirrorOp *op = opaque;
-    MirrorBlockJob *s = op->s;
-    if (ret < 0) {
-        BlockErrorAction action;
-
-        bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors);
-        action = mirror_error_action(s, false, -ret);
-        if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
-            s->ret = ret;
-        }
-    }
-    mirror_iteration_done(op, ret);
-}
-
-static void mirror_read_complete(void *opaque, int ret)
-{
-    MirrorOp *op = opaque;
-    MirrorBlockJob *s = op->s;
-    if (ret < 0) {
-        BlockErrorAction action;
-
-        bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors);
-        action = mirror_error_action(s, true, -ret);
-        if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
-            s->ret = ret;
-        }
-
-        mirror_iteration_done(op, ret);
-        return;
-    }
-    bdrv_aio_writev(s->target, op->sector_num, &op->qiov, op->nb_sectors,
-                    mirror_write_complete, op);
-}
-
-static inline void mirror_clip_sectors(MirrorBlockJob *s,
-                                       int64_t sector_num,
-                                       int *nb_sectors)
-{
-    *nb_sectors = MIN(*nb_sectors,
-                      s->bdev_length / BDRV_SECTOR_SIZE - sector_num);
-}
-
-/* Round sector_num and/or nb_sectors to target cluster if COW is needed, and
- * return the offset of the adjusted tail sector against original. */
-static int mirror_cow_align(MirrorBlockJob *s,
-                            int64_t *sector_num,
-                            int *nb_sectors)
-{
-    bool need_cow;
-    int ret = 0;
-    int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS;
-    int64_t align_sector_num = *sector_num;
-    int align_nb_sectors = *nb_sectors;
-    int max_sectors = chunk_sectors * s->max_iov;
-
-    need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap);
-    need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors,
-                          s->cow_bitmap);
-    if (need_cow) {
-        bdrv_round_to_clusters(s->target, *sector_num, *nb_sectors,
-                               &align_sector_num, &align_nb_sectors);
-    }
-
-    if (align_nb_sectors > max_sectors) {
-        align_nb_sectors = max_sectors;
-        if (need_cow) {
-            align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors,
-                                               s->target_cluster_sectors);
-        }
-    }
-    /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but
-     * that doesn't matter because it's already the end of source image. */
-    mirror_clip_sectors(s, align_sector_num, &align_nb_sectors);
-
-    ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors);
-    *sector_num = align_sector_num;
-    *nb_sectors = align_nb_sectors;
-    assert(ret >= 0);
-    return ret;
-}
-
-static inline void mirror_wait_for_io(MirrorBlockJob *s)
-{
-    assert(!s->waiting_for_io);
-    s->waiting_for_io = true;
-    qemu_coroutine_yield();
-    s->waiting_for_io = false;
-}
-
-/* Submit async read while handling COW.
- * Returns: nb_sectors if no alignment is necessary, or
- *          (new_end - sector_num) if tail is rounded up or down due to
- *          alignment or buffer limit.
- */
-static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num,
-                          int nb_sectors)
-{
-    BlockDriverState *source = s->common.bs;
-    int sectors_per_chunk, nb_chunks;
-    int ret = nb_sectors;
-    MirrorOp *op;
-
-    sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
-
-    /* We can only handle as much as buf_size at a time. */
-    nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors);
-    assert(nb_sectors);
-
-    if (s->cow_bitmap) {
-        ret += mirror_cow_align(s, &sector_num, &nb_sectors);
-    }
-    assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size);
-    /* The sector range must meet granularity because:
-     * 1) Caller passes in aligned values;
-     * 2) mirror_cow_align is used only when target cluster is larger. */
-    assert(!(sector_num % sectors_per_chunk));
-    nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk);
-
-    while (s->buf_free_count < nb_chunks) {
-        trace_mirror_yield_in_flight(s, sector_num, s->in_flight);
-        mirror_wait_for_io(s);
-    }
-
-    /* Allocate a MirrorOp that is used as an AIO callback.  */
-    op = g_new(MirrorOp, 1);
-    op->s = s;
-    op->sector_num = sector_num;
-    op->nb_sectors = nb_sectors;
-
-    /* Now make a QEMUIOVector taking enough granularity-sized chunks
-     * from s->buf_free.
-     */
-    qemu_iovec_init(&op->qiov, nb_chunks);
-    while (nb_chunks-- > 0) {
-        MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free);
-        size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size;
-
-        QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next);
-        s->buf_free_count--;
-        qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining));
-    }
-
-    /* Copy the dirty cluster.  */
-    s->in_flight++;
-    s->sectors_in_flight += nb_sectors;
-    trace_mirror_one_iteration(s, sector_num, nb_sectors);
-
-    bdrv_aio_readv(source, sector_num, &op->qiov, nb_sectors,
-                   mirror_read_complete, op);
-    return ret;
-}
-
-static void mirror_do_zero_or_discard(MirrorBlockJob *s,
-                                      int64_t sector_num,
-                                      int nb_sectors,
-                                      bool is_discard)
-{
-    MirrorOp *op;
-
-    /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed
-     * so the freeing in mirror_iteration_done is nop. */
-    op = g_new0(MirrorOp, 1);
-    op->s = s;
-    op->sector_num = sector_num;
-    op->nb_sectors = nb_sectors;
-
-    s->in_flight++;
-    s->sectors_in_flight += nb_sectors;
-    if (is_discard) {
-        bdrv_aio_discard(s->target, sector_num, op->nb_sectors,
-                         mirror_write_complete, op);
-    } else {
-        bdrv_aio_write_zeroes(s->target, sector_num, op->nb_sectors,
-                              s->unmap ? BDRV_REQ_MAY_UNMAP : 0,
-                              mirror_write_complete, op);
-    }
-}
-
-static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
-{
-    BlockDriverState *source = s->common.bs;
-    int64_t sector_num, first_chunk;
-    uint64_t delay_ns = 0;
-    /* At least the first dirty chunk is mirrored in one iteration. */
-    int nb_chunks = 1;
-    int64_t end = s->bdev_length / BDRV_SECTOR_SIZE;
-    int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
-
-    sector_num = hbitmap_iter_next(&s->hbi);
-    if (sector_num < 0) {
-        bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi);
-        sector_num = hbitmap_iter_next(&s->hbi);
-        trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap));
-        assert(sector_num >= 0);
-    }
-
-    first_chunk = sector_num / sectors_per_chunk;
-    while (test_bit(first_chunk, s->in_flight_bitmap)) {
-        trace_mirror_yield_in_flight(s, first_chunk, s->in_flight);
-        mirror_wait_for_io(s);
-    }
-
-    /* Find the number of consective dirty chunks following the first dirty
-     * one, and wait for in flight requests in them. */
-    while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) {
-        int64_t hbitmap_next;
-        int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk;
-        int64_t next_chunk = next_sector / sectors_per_chunk;
-        if (next_sector >= end ||
-            !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) {
-            break;
-        }
-        if (test_bit(next_chunk, s->in_flight_bitmap)) {
-            break;
-        }
-
-        hbitmap_next = hbitmap_iter_next(&s->hbi);
-        if (hbitmap_next > next_sector || hbitmap_next < 0) {
-            /* The bitmap iterator's cache is stale, refresh it */
-            bdrv_set_dirty_iter(&s->hbi, next_sector);
-            hbitmap_next = hbitmap_iter_next(&s->hbi);
-        }
-        assert(hbitmap_next == next_sector);
-        nb_chunks++;
-    }
-
-    /* Clear dirty bits before querying the block status, because
-     * calling bdrv_get_block_status_above could yield - if some blocks are
-     * marked dirty in this window, we need to know.
-     */
-    bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num,
-                            nb_chunks * sectors_per_chunk);
-    bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks);
-    while (nb_chunks > 0 && sector_num < end) {
-        int ret;
-        int io_sectors;
-        BlockDriverState *file;
-        enum MirrorMethod {
-            MIRROR_METHOD_COPY,
-            MIRROR_METHOD_ZERO,
-            MIRROR_METHOD_DISCARD
-        } mirror_method = MIRROR_METHOD_COPY;
-
-        assert(!(sector_num % sectors_per_chunk));
-        ret = bdrv_get_block_status_above(source, NULL, sector_num,
-                                          nb_chunks * sectors_per_chunk,
-                                          &io_sectors, &file);
-        if (ret < 0) {
-            io_sectors = nb_chunks * sectors_per_chunk;
-        }
-
-        io_sectors -= io_sectors % sectors_per_chunk;
-        if (io_sectors < sectors_per_chunk) {
-            io_sectors = sectors_per_chunk;
-        } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) {
-            int64_t target_sector_num;
-            int target_nb_sectors;
-            bdrv_round_to_clusters(s->target, sector_num, io_sectors,
-                                   &target_sector_num, &target_nb_sectors);
-            if (target_sector_num == sector_num &&
-                target_nb_sectors == io_sectors) {
-                mirror_method = ret & BDRV_BLOCK_ZERO ?
-                                    MIRROR_METHOD_ZERO :
-                                    MIRROR_METHOD_DISCARD;
-            }
-        }
-
-        mirror_clip_sectors(s, sector_num, &io_sectors);
-        switch (mirror_method) {
-        case MIRROR_METHOD_COPY:
-            io_sectors = mirror_do_read(s, sector_num, io_sectors);
-            break;
-        case MIRROR_METHOD_ZERO:
-            mirror_do_zero_or_discard(s, sector_num, io_sectors, false);
-            break;
-        case MIRROR_METHOD_DISCARD:
-            mirror_do_zero_or_discard(s, sector_num, io_sectors, true);
-            break;
-        default:
-            abort();
-        }
-        assert(io_sectors);
-        sector_num += io_sectors;
-        nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk);
-        delay_ns += ratelimit_calculate_delay(&s->limit, io_sectors);
-    }
-    return delay_ns;
-}
-
-static void mirror_free_init(MirrorBlockJob *s)
-{
-    int granularity = s->granularity;
-    size_t buf_size = s->buf_size;
-    uint8_t *buf = s->buf;
-
-    assert(s->buf_free_count == 0);
-    QSIMPLEQ_INIT(&s->buf_free);
-    while (buf_size != 0) {
-        MirrorBuffer *cur = (MirrorBuffer *)buf;
-        QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next);
-        s->buf_free_count++;
-        buf_size -= granularity;
-        buf += granularity;
-    }
-}
-
-static void mirror_drain(MirrorBlockJob *s)
-{
-    while (s->in_flight > 0) {
-        mirror_wait_for_io(s);
-    }
-}
-
-typedef struct {
-    int ret;
-} MirrorExitData;
-
-static void mirror_exit(BlockJob *job, void *opaque)
-{
-    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
-    MirrorExitData *data = opaque;
-    AioContext *replace_aio_context = NULL;
-    BlockDriverState *src = s->common.bs;
-
-    /* Make sure that the source BDS doesn't go away before we called
-     * block_job_completed(). */
-    bdrv_ref(src);
-
-    if (s->to_replace) {
-        replace_aio_context = bdrv_get_aio_context(s->to_replace);
-        aio_context_acquire(replace_aio_context);
-    }
-
-    if (s->should_complete && data->ret == 0) {
-        BlockDriverState *to_replace = s->common.bs;
-        if (s->to_replace) {
-            to_replace = s->to_replace;
-        }
-
-        /* This was checked in mirror_start_job(), but meanwhile one of the
-         * nodes could have been newly attached to a BlockBackend. */
-        if (to_replace->blk && s->target->blk) {
-            error_report("block job: Can't create node with two BlockBackends");
-            data->ret = -EINVAL;
-            goto out;
-        }
-
-        if (bdrv_get_flags(s->target) != bdrv_get_flags(to_replace)) {
-            bdrv_reopen(s->target, bdrv_get_flags(to_replace), NULL);
-        }
-        bdrv_replace_in_backing_chain(to_replace, s->target);
-    }
-
-out:
-    if (s->to_replace) {
-        bdrv_op_unblock_all(s->to_replace, s->replace_blocker);
-        error_free(s->replace_blocker);
-        bdrv_unref(s->to_replace);
-    }
-    if (replace_aio_context) {
-        aio_context_release(replace_aio_context);
-    }
-    g_free(s->replaces);
-    bdrv_op_unblock_all(s->target, s->common.blocker);
-    bdrv_unref(s->target);
-    block_job_completed(&s->common, data->ret);
-    g_free(data);
-    bdrv_drained_end(src);
-    if (qemu_get_aio_context() == bdrv_get_aio_context(src)) {
-        aio_enable_external(iohandler_get_aio_context());
-    }
-    bdrv_unref(src);
-}
-
-static void coroutine_fn mirror_run(void *opaque)
-{
-    MirrorBlockJob *s = opaque;
-    MirrorExitData *data;
-    BlockDriverState *bs = s->common.bs;
-    int64_t sector_num, end, length;
-    uint64_t last_pause_ns;
-    BlockDriverInfo bdi;
-    char backing_filename[2]; /* we only need 2 characters because we are only
-                                 checking for a NULL string */
-    int ret = 0;
-    int n;
-    int target_cluster_size = BDRV_SECTOR_SIZE;
-
-    if (block_job_is_cancelled(&s->common)) {
-        goto immediate_exit;
-    }
-
-    s->bdev_length = bdrv_getlength(bs);
-    if (s->bdev_length < 0) {
-        ret = s->bdev_length;
-        goto immediate_exit;
-    } else if (s->bdev_length == 0) {
-        /* Report BLOCK_JOB_READY and wait for complete. */
-        block_job_event_ready(&s->common);
-        s->synced = true;
-        while (!block_job_is_cancelled(&s->common) && !s->should_complete) {
-            block_job_yield(&s->common);
-        }
-        s->common.cancelled = false;
-        goto immediate_exit;
-    }
-
-    length = DIV_ROUND_UP(s->bdev_length, s->granularity);
-    s->in_flight_bitmap = bitmap_new(length);
-
-    /* If we have no backing file yet in the destination, we cannot let
-     * the destination do COW.  Instead, we copy sectors around the
-     * dirty data if needed.  We need a bitmap to do that.
-     */
-    bdrv_get_backing_filename(s->target, backing_filename,
-                              sizeof(backing_filename));
-    if (!bdrv_get_info(s->target, &bdi) && bdi.cluster_size) {
-        target_cluster_size = bdi.cluster_size;
-    }
-    if (backing_filename[0] && !s->target->backing
-        && s->granularity < target_cluster_size) {
-        s->buf_size = MAX(s->buf_size, target_cluster_size);
-        s->cow_bitmap = bitmap_new(length);
-    }
-    s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS;
-    s->max_iov = MIN(s->common.bs->bl.max_iov, s->target->bl.max_iov);
-
-    end = s->bdev_length / BDRV_SECTOR_SIZE;
-    s->buf = qemu_try_blockalign(bs, s->buf_size);
-    if (s->buf == NULL) {
-        ret = -ENOMEM;
-        goto immediate_exit;
-    }
-
-    mirror_free_init(s);
-
-    last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-    if (!s->is_none_mode) {
-        /* First part, loop on the sectors and initialize the dirty bitmap.  */
-        BlockDriverState *base = s->base;
-        bool mark_all_dirty = s->base == NULL && !bdrv_has_zero_init(s->target);
-
-        for (sector_num = 0; sector_num < end; ) {
-            /* Just to make sure we are not exceeding int limit. */
-            int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS,
-                                 end - sector_num);
-            int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-
-            if (now - last_pause_ns > SLICE_TIME) {
-                last_pause_ns = now;
-                block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0);
-            }
-
-            if (block_job_is_cancelled(&s->common)) {
-                goto immediate_exit;
-            }
-
-            ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n);
-
-            if (ret < 0) {
-                goto immediate_exit;
-            }
-
-            assert(n > 0);
-            if (ret == 1 || mark_all_dirty) {
-                bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n);
-            }
-            sector_num += n;
-        }
-    }
-
-    bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi);
-    for (;;) {
-        uint64_t delay_ns = 0;
-        int64_t cnt;
-        bool should_complete;
-
-        if (s->ret < 0) {
-            ret = s->ret;
-            goto immediate_exit;
-        }
-
-        cnt = bdrv_get_dirty_count(s->dirty_bitmap);
-        /* s->common.offset contains the number of bytes already processed so
-         * far, cnt is the number of dirty sectors remaining and
-         * s->sectors_in_flight is the number of sectors currently being
-         * processed; together those are the current total operation length */
-        s->common.len = s->common.offset +
-                        (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE;
-
-        /* Note that even when no rate limit is applied we need to yield
-         * periodically with no pending I/O so that bdrv_drain_all() returns.
-         * We do so every SLICE_TIME nanoseconds, or when there is an error,
-         * or when the source is clean, whichever comes first.
-         */
-        if (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - last_pause_ns < SLICE_TIME &&
-            s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
-            if (s->in_flight == MAX_IN_FLIGHT || s->buf_free_count == 0 ||
-                (cnt == 0 && s->in_flight > 0)) {
-                trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt);
-                mirror_wait_for_io(s);
-                continue;
-            } else if (cnt != 0) {
-                delay_ns = mirror_iteration(s);
-            }
-        }
-
-        should_complete = false;
-        if (s->in_flight == 0 && cnt == 0) {
-            trace_mirror_before_flush(s);
-            ret = bdrv_flush(s->target);
-            if (ret < 0) {
-                if (mirror_error_action(s, false, -ret) ==
-                    BLOCK_ERROR_ACTION_REPORT) {
-                    goto immediate_exit;
-                }
-            } else {
-                /* We're out of the streaming phase.  From now on, if the job
-                 * is cancelled we will actually complete all pending I/O and
-                 * report completion.  This way, block-job-cancel will leave
-                 * the target in a consistent state.
-                 */
-                if (!s->synced) {
-                    block_job_event_ready(&s->common);
-                    s->synced = true;
-                }
-
-                should_complete = s->should_complete ||
-                    block_job_is_cancelled(&s->common);
-                cnt = bdrv_get_dirty_count(s->dirty_bitmap);
-            }
-        }
-
-        if (cnt == 0 && should_complete) {
-            /* The dirty bitmap is not updated while operations are pending.
-             * If we're about to exit, wait for pending operations before
-             * calling bdrv_get_dirty_count(bs), or we may exit while the
-             * source has dirty data to copy!
-             *
-             * Note that I/O can be submitted by the guest while
-             * mirror_populate runs.
-             */
-            trace_mirror_before_drain(s, cnt);
-            bdrv_co_drain(bs);
-            cnt = bdrv_get_dirty_count(s->dirty_bitmap);
-        }
-
-        ret = 0;
-        trace_mirror_before_sleep(s, cnt, s->synced, delay_ns);
-        if (!s->synced) {
-            block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
-            if (block_job_is_cancelled(&s->common)) {
-                break;
-            }
-        } else if (!should_complete) {
-            delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0);
-            block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
-        } else if (cnt == 0) {
-            /* The two disks are in sync.  Exit and report successful
-             * completion.
-             */
-            assert(QLIST_EMPTY(&bs->tracked_requests));
-            s->common.cancelled = false;
-            break;
-        }
-        last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-    }
-
-immediate_exit:
-    if (s->in_flight > 0) {
-        /* We get here only if something went wrong.  Either the job failed,
-         * or it was cancelled prematurely so that we do not guarantee that
-         * the target is a copy of the source.
-         */
-        assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common)));
-        mirror_drain(s);
-    }
-
-    assert(s->in_flight == 0);
-    qemu_vfree(s->buf);
-    g_free(s->cow_bitmap);
-    g_free(s->in_flight_bitmap);
-    bdrv_release_dirty_bitmap(bs, s->dirty_bitmap);
-    if (s->target->blk) {
-        blk_iostatus_disable(s->target->blk);
-    }
-
-    data = g_malloc(sizeof(*data));
-    data->ret = ret;
-    /* Before we switch to target in mirror_exit, make sure data doesn't
-     * change. */
-    bdrv_drained_begin(s->common.bs);
-    if (qemu_get_aio_context() == bdrv_get_aio_context(bs)) {
-        /* FIXME: virtio host notifiers run on iohandler_ctx, therefore the
-         * above bdrv_drained_end isn't enough to quiesce it. This is ugly, we
-         * need a block layer API change to achieve this. */
-        aio_disable_external(iohandler_get_aio_context());
-    }
-    block_job_defer_to_main_loop(&s->common, mirror_exit, data);
-}
-
-static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp)
-{
-    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
-
-    if (speed < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER, "speed");
-        return;
-    }
-    ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
-}
-
-static void mirror_iostatus_reset(BlockJob *job)
-{
-    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
-
-    if (s->target->blk) {
-        blk_iostatus_reset(s->target->blk);
-    }
-}
-
-static void mirror_complete(BlockJob *job, Error **errp)
-{
-    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
-    Error *local_err = NULL;
-    int ret;
-
-    ret = bdrv_open_backing_file(s->target, NULL, "backing", &local_err);
-    if (ret < 0) {
-        error_propagate(errp, local_err);
-        return;
-    }
-    if (!s->synced) {
-        error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
-        return;
-    }
-
-    /* check the target bs is not blocked and block all operations on it */
-    if (s->replaces) {
-        AioContext *replace_aio_context;
-
-        s->to_replace = bdrv_find_node(s->replaces);
-        if (!s->to_replace) {
-            error_setg(errp, "Node name '%s' not found", s->replaces);
-            return;
-        }
-
-        replace_aio_context = bdrv_get_aio_context(s->to_replace);
-        aio_context_acquire(replace_aio_context);
-
-        error_setg(&s->replace_blocker,
-                   "block device is in use by block-job-complete");
-        bdrv_op_block_all(s->to_replace, s->replace_blocker);
-        bdrv_ref(s->to_replace);
-
-        aio_context_release(replace_aio_context);
-    }
-
-    s->should_complete = true;
-    block_job_enter(&s->common);
-}
-
-static const BlockJobDriver mirror_job_driver = {
-    .instance_size = sizeof(MirrorBlockJob),
-    .job_type      = BLOCK_JOB_TYPE_MIRROR,
-    .set_speed     = mirror_set_speed,
-    .iostatus_reset= mirror_iostatus_reset,
-    .complete      = mirror_complete,
-};
-
-static const BlockJobDriver commit_active_job_driver = {
-    .instance_size = sizeof(MirrorBlockJob),
-    .job_type      = BLOCK_JOB_TYPE_COMMIT,
-    .set_speed     = mirror_set_speed,
-    .iostatus_reset
-                   = mirror_iostatus_reset,
-    .complete      = mirror_complete,
-};
-
-static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target,
-                             const char *replaces,
-                             int64_t speed, uint32_t granularity,
-                             int64_t buf_size,
-                             BlockdevOnError on_source_error,
-                             BlockdevOnError on_target_error,
-                             bool unmap,
-                             BlockCompletionFunc *cb,
-                             void *opaque, Error **errp,
-                             const BlockJobDriver *driver,
-                             bool is_none_mode, BlockDriverState *base)
-{
-    MirrorBlockJob *s;
-    BlockDriverState *replaced_bs;
-
-    if (granularity == 0) {
-        granularity = bdrv_get_default_bitmap_granularity(target);
-    }
-
-    assert ((granularity & (granularity - 1)) == 0);
-
-    if ((on_source_error == BLOCKDEV_ON_ERROR_STOP ||
-         on_source_error == BLOCKDEV_ON_ERROR_ENOSPC) &&
-        (!bs->blk || !blk_iostatus_is_enabled(bs->blk))) {
-        error_setg(errp, QERR_INVALID_PARAMETER, "on-source-error");
-        return;
-    }
-
-    if (buf_size < 0) {
-        error_setg(errp, "Invalid parameter 'buf-size'");
-        return;
-    }
-
-    if (buf_size == 0) {
-        buf_size = DEFAULT_MIRROR_BUF_SIZE;
-    }
-
-    /* We can't support this case as long as the block layer can't handle
-     * multiple BlockBackends per BlockDriverState. */
-    if (replaces) {
-        replaced_bs = bdrv_lookup_bs(replaces, replaces, errp);
-        if (replaced_bs == NULL) {
-            return;
-        }
-    } else {
-        replaced_bs = bs;
-    }
-    if (replaced_bs->blk && target->blk) {
-        error_setg(errp, "Can't create node with two BlockBackends");
-        return;
-    }
-
-    s = block_job_create(driver, bs, speed, cb, opaque, errp);
-    if (!s) {
-        return;
-    }
-
-    s->replaces = g_strdup(replaces);
-    s->on_source_error = on_source_error;
-    s->on_target_error = on_target_error;
-    s->target = target;
-    s->is_none_mode = is_none_mode;
-    s->base = base;
-    s->granularity = granularity;
-    s->buf_size = ROUND_UP(buf_size, granularity);
-    s->unmap = unmap;
-
-    s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
-    if (!s->dirty_bitmap) {
-        g_free(s->replaces);
-        block_job_unref(&s->common);
-        return;
-    }
-
-    bdrv_op_block_all(s->target, s->common.blocker);
-
-    if (s->target->blk) {
-        blk_set_on_error(s->target->blk, on_target_error, on_target_error);
-        blk_iostatus_enable(s->target->blk);
-    }
-    s->common.co = qemu_coroutine_create(mirror_run);
-    trace_mirror_start(bs, s, s->common.co, opaque);
-    qemu_coroutine_enter(s->common.co, s);
-}
-
-void mirror_start(BlockDriverState *bs, BlockDriverState *target,
-                  const char *replaces,
-                  int64_t speed, uint32_t granularity, int64_t buf_size,
-                  MirrorSyncMode mode, BlockdevOnError on_source_error,
-                  BlockdevOnError on_target_error,
-                  bool unmap,
-                  BlockCompletionFunc *cb,
-                  void *opaque, Error **errp)
-{
-    bool is_none_mode;
-    BlockDriverState *base;
-
-    if (mode == MIRROR_SYNC_MODE_INCREMENTAL) {
-        error_setg(errp, "Sync mode 'incremental' not supported");
-        return;
-    }
-    is_none_mode = mode == MIRROR_SYNC_MODE_NONE;
-    base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL;
-    mirror_start_job(bs, target, replaces,
-                     speed, granularity, buf_size,
-                     on_source_error, on_target_error, unmap, cb, opaque, errp,
-                     &mirror_job_driver, is_none_mode, base);
-}
-
-void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
-                         int64_t speed,
-                         BlockdevOnError on_error,
-                         BlockCompletionFunc *cb,
-                         void *opaque, Error **errp)
-{
-    int64_t length, base_length;
-    int orig_base_flags;
-    int ret;
-    Error *local_err = NULL;
-
-    orig_base_flags = bdrv_get_flags(base);
-
-    if (bdrv_reopen(base, bs->open_flags, errp)) {
-        return;
-    }
-
-    length = bdrv_getlength(bs);
-    if (length < 0) {
-        error_setg_errno(errp, -length,
-                         "Unable to determine length of %s", bs->filename);
-        goto error_restore_flags;
-    }
-
-    base_length = bdrv_getlength(base);
-    if (base_length < 0) {
-        error_setg_errno(errp, -base_length,
-                         "Unable to determine length of %s", base->filename);
-        goto error_restore_flags;
-    }
-
-    if (length > base_length) {
-        ret = bdrv_truncate(base, length);
-        if (ret < 0) {
-            error_setg_errno(errp, -ret,
-                            "Top image %s is larger than base image %s, and "
-                             "resize of base image failed",
-                             bs->filename, base->filename);
-            goto error_restore_flags;
-        }
-    }
-
-    bdrv_ref(base);
-    mirror_start_job(bs, base, NULL, speed, 0, 0,
-                     on_error, on_error, false, cb, opaque, &local_err,
-                     &commit_active_job_driver, false, base);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        goto error_restore_flags;
-    }
-
-    return;
-
-error_restore_flags:
-    /* ignore error and errp for bdrv_reopen, because we want to propagate
-     * the original error */
-    bdrv_reopen(base, orig_base_flags, NULL);
-    return;
-}