예제 #1
0
파일: mirror.c 프로젝트: jiapei100/qemu
static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read,
                                            int error)
{
    s->synced = false;
    if (read) {
        return block_job_error_action(&s->common, s->on_source_error,
                                      true, error);
    } else {
        return block_job_error_action(&s->common, s->on_target_error,
                                      false, error);
    }
}
예제 #2
0
파일: stream.c 프로젝트: OSLL/qemu-xtensa
static int coroutine_fn stream_run(Job *job, Error **errp)
{
    StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
    BlockBackend *blk = s->common.blk;
    BlockDriverState *bs = blk_bs(blk);
    BlockDriverState *base = s->base;
    int64_t len;
    int64_t offset = 0;
    uint64_t delay_ns = 0;
    int error = 0;
    int ret = 0;
    int64_t n = 0; /* bytes */
    void *buf;

    if (!bs->backing) {
        goto out;
    }

    len = bdrv_getlength(bs);
    if (len < 0) {
        ret = len;
        goto out;
    }
    job_progress_set_remaining(&s->common.job, len);

    buf = qemu_blockalign(bs, STREAM_BUFFER_SIZE);

    /* Turn on copy-on-read for the whole block device so that guest read
     * requests help us make progress.  Only do this when copying the entire
     * backing chain since the copy-on-read operation does not take base into
     * account.
     */
    if (!base) {
        bdrv_enable_copy_on_read(bs);
    }

    for ( ; offset < len; offset += n) {
        bool copy;

        /* Note that even when no rate limit is applied we need to yield
         * with no pending I/O here so that bdrv_drain_all() returns.
         */
        job_sleep_ns(&s->common.job, delay_ns);
        if (job_is_cancelled(&s->common.job)) {
            break;
        }

        copy = false;

        ret = bdrv_is_allocated(bs, offset, STREAM_BUFFER_SIZE, &n);
        if (ret == 1) {
            /* Allocated in the top, no need to copy.  */
        } else if (ret >= 0) {
            /* Copy if allocated in the intermediate images.  Limit to the
             * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE).  */
            ret = bdrv_is_allocated_above(backing_bs(bs), base,
                                          offset, n, &n);

            /* Finish early if end of backing file has been reached */
            if (ret == 0 && n == 0) {
                n = len - offset;
            }

            copy = (ret == 1);
        }
        trace_stream_one_iteration(s, offset, n, ret);
        if (copy) {
            ret = stream_populate(blk, offset, n, buf);
        }
        if (ret < 0) {
            BlockErrorAction action =
                block_job_error_action(&s->common, s->on_error, true, -ret);
            if (action == BLOCK_ERROR_ACTION_STOP) {
                n = 0;
                continue;
            }
            if (error == 0) {
                error = ret;
            }
            if (action == BLOCK_ERROR_ACTION_REPORT) {
                break;
            }
        }
        ret = 0;

        /* Publish progress */
        job_progress_update(&s->common.job, n);
        if (copy) {
            delay_ns = block_job_ratelimit_get_delay(&s->common, n);
        } else {
            delay_ns = 0;
        }
    }

    if (!base) {
        bdrv_disable_copy_on_read(bs);
    }

    /* Do not remove the backing file if an error was there but ignored.  */
    ret = error;

    qemu_vfree(buf);

out:
    /* Modify backing chain and close BDSes in main loop */
    return ret;
}
예제 #3
0
파일: commit.c 프로젝트: MaddTheSane/qemu
static int coroutine_fn commit_run(Job *job, Error **errp)
{
    CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
    int64_t offset;
    uint64_t delay_ns = 0;
    int ret = 0;
    int64_t n = 0; /* bytes */
    void *buf = NULL;
    int bytes_written = 0;
    int64_t len, base_len;

    ret = len = blk_getlength(s->top);
    if (len < 0) {
        goto out;
    }
    job_progress_set_remaining(&s->common.job, len);

    ret = base_len = blk_getlength(s->base);
    if (base_len < 0) {
        goto out;
    }

    if (base_len < len) {
        ret = blk_truncate(s->base, len, PREALLOC_MODE_OFF, NULL);
        if (ret) {
            goto out;
        }
    }

    buf = blk_blockalign(s->top, COMMIT_BUFFER_SIZE);

    for (offset = 0; offset < len; offset += n) {
        bool copy;

        /* Note that even when no rate limit is applied we need to yield
         * with no pending I/O here so that bdrv_drain_all() returns.
         */
        job_sleep_ns(&s->common.job, delay_ns);
        if (job_is_cancelled(&s->common.job)) {
            break;
        }
        /* Copy if allocated above the base */
        ret = bdrv_is_allocated_above(blk_bs(s->top), blk_bs(s->base),
                                      offset, COMMIT_BUFFER_SIZE, &n);
        copy = (ret == 1);
        trace_commit_one_iteration(s, offset, n, ret);
        if (copy) {
            ret = commit_populate(s->top, s->base, offset, n, buf);
            bytes_written += n;
        }
        if (ret < 0) {
            BlockErrorAction action =
                block_job_error_action(&s->common, false, s->on_error, -ret);
            if (action == BLOCK_ERROR_ACTION_REPORT) {
                goto out;
            } else {
                n = 0;
                continue;
            }
        }
        /* Publish progress */
        job_progress_update(&s->common.job, n);

        if (copy) {
            delay_ns = block_job_ratelimit_get_delay(&s->common, n);
        } else {
            delay_ns = 0;
        }
    }

    ret = 0;

out:
    qemu_vfree(buf);

    return ret;
}