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
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Incomplete
Bug description:
[impact]
4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to
mount virtual disks onto a local filesystem (see test case for reproducer).
4.4.0-98 works without issue.
I was able to bisect the issue down to
907196aba0d891c6d580abe69c36d3b4fd512dcc (a cherry-pick from
37091fdd831f28a6509008542174ed324dd645bc). Reverting this from 4.4
fixes the issue.
Installing the mainline kernel shows mainline is _not_ affected by
this bug.
In addition this is also reported in debian here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829532
[test case]
# given a vmdk disk with multiple partitions
sudo modprobe nbd
sudo qemu-nbd -d /dev/nbd0
sudo qemu-nbd -r -c /dev/nbd0 disk.vmdk
ls /dev/nbd0*
# here you won't see multiple partition, nor be able to mount a partition
locally
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743026/+subscriptions
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