This patch seems to fix the issue:
```
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 5f807a6..b761971 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -98,11 +98,6 @@ static inline struct device *nbd_to_dev(struct nbd_device
*nbd)
return disk_to_dev(nbd->disk);
}
-static bool nbd_is_connected(struct nbd_device *nbd)
-{
- return !!nbd->task_recv;
-}
-
static const char *nbdcmd_to_ascii(int cmd)
{
switch (cmd) {
@@ -126,9 +121,6 @@ static int nbd_size_clear(struct nbd_device *nbd, struct
block_device *bdev)
static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev)
{
- if (!nbd_is_connected(nbd))
- return;
-
bdev->bd_inode->i_size = nbd->bytesize;
set_capacity(nbd->disk, nbd->bytesize >> 9);
kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
```
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https://bugs.launchpad.net/bugs/1743026
Title:
qemu-nbd -c /dev/nbd0 fails to map partitions
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