Re: [PATCH v5 7/8] vduse-blk: Add vduse-blk resize support

[Stefan Hajnoczi]

On Wed, May 04, 2022 at 03:40:50PM +0800, Xie Yongji wrote:
> To support block resize, this uses vduse_dev_update_config()
> to update the capacity field in configuration space and inject
> config interrupt on the block resize callback.
> 
> Signed-off-by: Xie Yongji 
> Reviewed-by: Stefan Hajnoczi 
> ---
>  block/export/vduse-blk.c | 20 
>  1 file changed, 20 insertions(+)

Reviewed-by: Stefan Hajnoczi 


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[PATCH v5 7/8] vduse-blk: Add vduse-blk resize support

[Xie Yongji]

To support block resize, this uses vduse_dev_update_config()
to update the capacity field in configuration space and inject
config interrupt on the block resize callback.

Signed-off-by: Xie Yongji 
Reviewed-by: Stefan Hajnoczi 
---
 block/export/vduse-blk.c | 20 
 1 file changed, 20 insertions(+)

diff --git a/block/export/vduse-blk.c b/block/export/vduse-blk.c
index 8580ae929f..2b72baf7ab 100644
--- a/block/export/vduse-blk.c
+++ b/block/export/vduse-blk.c
@@ -188,6 +188,23 @@ static void blk_aio_detach(void *opaque)
 vblk_exp->export.ctx = NULL;
 }
 
+static void vduse_blk_resize(void *opaque)
+{
+BlockExport *exp = opaque;
+VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export);
+struct virtio_blk_config config;
+
+config.capacity =
+cpu_to_le64(blk_getlength(exp->blk) >> VIRTIO_BLK_SECTOR_BITS);
+vduse_dev_update_config(vblk_exp->dev, sizeof(config.capacity),
+offsetof(struct virtio_blk_config, capacity),
+(char *));
+}
+
+static const BlockDevOps vduse_block_ops = {
+.resize_cb = vduse_blk_resize,
+};
+
 static int vduse_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
 Error **errp)
 {
@@ -284,6 +301,8 @@ static int vduse_blk_exp_create(BlockExport *exp, 
BlockExportOptions *opts,
 blk_add_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach,
  vblk_exp);
 
+blk_set_dev_ops(exp->blk, _block_ops, exp);
+
 return 0;
 }
 
@@ -293,6 +312,7 @@ static void vduse_blk_exp_delete(BlockExport *exp)
 
 blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach,
 vblk_exp);
+blk_set_dev_ops(exp->blk, NULL, NULL);
 vduse_dev_destroy(vblk_exp->dev);
 }
 
-- 
2.20.1