Re: [RFC v4 2/9] qemu-io: add zoned block device operations.

[Hannes Reinecke <hare@suse.de>]

On 7/12/22 04:13, Sam Li wrote:
> Add zoned storage commands of the device: zone_open(zo), zone_close(zc),
> zone_reset(zs), zone_report(zp), zone_finish(zf).
> 
> For example, it can be called by:
> ./build/qemu-io --image-opts driver=zoned_host_device, filename=/dev/nullb0
> -c "zone_report 0 0 1"
> 
> Signed-off-by: Sam Li <faithilikerun@gmail.com>
> ---
>   block/io.c               |  57 ++++++++++++++++
>   include/block/block-io.h |  13 ++++
>   qemu-io-cmds.c           | 143 +++++++++++++++++++++++++++++++++++++++
>   3 files changed, 213 insertions(+)
> 
> diff --git a/block/io.c b/block/io.c
> index 1e9bf09a49..a760be0131 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -3243,6 +3243,63 @@ out:
>       return co.ret;
>   }
>   
> +int bdrv_co_zone_report(BlockDriverState *bs, int64_t offset,
> +                        int64_t *nr_zones,
> +                        BlockZoneDescriptor *zones)
> +{
> +    BlockDriver *drv = bs->drv;
> +    CoroutineIOCompletion co = {
> +            .coroutine = qemu_coroutine_self(),
> +    };
> +    IO_CODE();
> +
> +    bdrv_inc_in_flight(bs);
> +    if (!drv || (!drv->bdrv_co_zone_report)) {
> +        co.ret = -ENOTSUP;
> +        goto out;
> +    }
> +
> +    if (drv->bdrv_co_zone_report) {
> +        co.ret = drv->bdrv_co_zone_report(bs, offset, nr_zones, zones);
> +    } else {
> +        co.ret = -ENOTSUP;
> +        goto out;
> +        qemu_coroutine_yield();
> +    }
> +
> +out:
> +    bdrv_dec_in_flight(bs);
> +    return co.ret;
> +}
> +
> +int bdrv_co_zone_mgmt(BlockDriverState *bs, enum zone_op op,
> +        int64_t offset, int64_t len)
> +{
> +    BlockDriver *drv = bs->drv;
> +    CoroutineIOCompletion co = {
> +            .coroutine = qemu_coroutine_self(),
> +    };
> +    IO_CODE();
> +
> +    bdrv_inc_in_flight(bs);
> +    if (!drv || (!drv->bdrv_co_zone_mgmt)) {
> +        co.ret = -ENOTSUP;
> +        goto out;
> +    }
> +
> +    if (drv->bdrv_co_zone_mgmt) {
> +        co.ret = drv->bdrv_co_zone_mgmt(bs, op, offset, len);
> +    } else {
> +        co.ret = -ENOTSUP;
> +        goto out;
> +        qemu_coroutine_yield();
> +    }
> +
> +out:
> +    bdrv_dec_in_flight(bs);
> +    return co.ret;
> +}
> +
>   void *qemu_blockalign(BlockDriverState *bs, size_t size)
>   {
>       IO_CODE();
> diff --git a/include/block/block-io.h b/include/block/block-io.h
> index 053a27141a..a0ae140452 100644
> --- a/include/block/block-io.h
> +++ b/include/block/block-io.h
> @@ -80,6 +80,13 @@ int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf);
>   /* Ensure contents are flushed to disk.  */
>   int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
>   
> +/* Report zone information of zone block device. */
> +int coroutine_fn bdrv_co_zone_report(BlockDriverState *bs, int64_t offset,
> +                                     int64_t *nr_zones,
> +                                     BlockZoneDescriptor *zones);
> +int coroutine_fn bdrv_co_zone_mgmt(BlockDriverState *bs, zone_op op,
> +                                   int64_t offset, int64_t len);
> +
>   int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes);
>   bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
>   int bdrv_block_status(BlockDriverState *bs, int64_t offset,
> @@ -289,6 +296,12 @@ bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
>   int generated_co_wrapper
>   bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
>   
> +int generated_co_wrapper
> +blk_zone_report(BlockBackend *blk, int64_t offset, int64_t *nr_zones,
> +                BlockZoneDescriptor *zones);
> +int generated_co_wrapper
> +blk_zone_mgmt(BlockBackend *blk, enum zone_op op, int64_t offset, int64_t len);
> +
>   /**
>    * bdrv_parent_drained_begin_single:
>    *
> diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
> index 2f0d8ac25a..a88fa322d2 100644
> --- a/qemu-io-cmds.c
> +++ b/qemu-io-cmds.c
> @@ -1706,6 +1706,144 @@ static const cmdinfo_t flush_cmd = {
>       .oneline    = "flush all in-core file state to disk",
>   };
>   
> +static int zone_report_f(BlockBackend *blk, int argc, char **argv)
> +{
> +    int ret;
> +    int64_t offset, nr_zones;
> +
> +    ++optind;
> +    offset = cvtnum(argv[optind]);
> +    ++optind;
> +    nr_zones = cvtnum(argv[optind]);
> +
> +    g_autofree BlockZoneDescriptor *zones = NULL;
> +    zones = g_new(BlockZoneDescriptor, nr_zones);
> +    ret = blk_zone_report(blk, offset, &nr_zones, zones);
> +    if (ret < 0) {
> +        printf("zone report failed: %s\n", strerror(-ret));
> +    } else {
> +        for (int i = 0; i < nr_zones; ++i) {
> +            printf("start: 0x%" PRIx64 ", len 0x%" PRIx64 ", "
> +                   "cap"" 0x%" PRIx64 ",wptr 0x%" PRIx64 ", "
> +                   "zcond:%u, [type: %u]\n",
> +                   zones[i].start, zones[i].length, zones[i].cap, zones[i].wp,
> +                   zones[i].cond, zones[i].type);
> +        }
> +    }
> +    return ret;
> +}
> +
> +static const cmdinfo_t zone_report_cmd = {
> +        .name = "zone_report",
> +        .altname = "zp",
> +        .cfunc = zone_report_f,
> +        .argmin = 2,
> +        .argmax = 2,
> +        .args = "offset number",
> +        .oneline = "report zone information",
> +};
> +
'zp' is a bit odd; I'd rather go with 'zrp'.

Otherwise:

Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
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