[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[Brad Figg]

** Tags added: cscc

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[heavendang]

there is a way to workaround it, use partprobe

it is the original solution:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=824553

** Bug watch added: Debian Bug tracker #824553
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=824553

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[heavendang]

is there a way to workaround this problems?

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[Chris J Arges]

Just a note the patch in #2 is most likely not correct, just a way for
me to narrow down the problem. Perhaps we missed a patch (or there is a
fix) that makes nbd_is_connected to the correct thing.

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
   Status: Incomplete => Triaged

** Changed in: linux (Ubuntu)
   Status: Incomplete => Triaged

** Tags added: kernel-da-key

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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[Bug 1743026] Re: qemu-nbd -c /dev/nbd0 fails to map partitions

[Chris J Arges]

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(_to_dev(nbd)->kobj, KOBJ_CHANGE);
```

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Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

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