https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211028
Bug ID: 211028
Summary: [GEOM][Hyper-V] gpart can't detect the new free space
after the disk capacity changes
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: de...@microsoft.com
When testing Hyper-V's Online VHDX Resize feature (refer to Bug 211000), I
noticed an issue: after resizing “da1”, if there was a disk read before
"camcontrol reprobe da1", gpart couldn't detect the new “free space", though it
could detect the new disk capacity.
To reproduce the bug, we need to run FreeBSD 12-CURRENT guest on Hyper-V (we
need to make sure the 2 patches mentioned by
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211000#c4 are used to avoid
the known issues) and do the following
1. This is before the disk capacity change:
[root@decui-b11 ~]# gpart show da1
=> 63 83886017 da1 MBR (40G)
63 83886017 - free - (40G)
2. Expand the disk capacity from 40GB to 50GB by Hyper-V management tool.
3.
[root@decui-b11 ~]# dd if=/dev/da1 of=/dev/null bs=512 count=1
1+0 records in
1+0 records out
512 bytes transferred in 0.000715 secs (715864 bytes/sec)
[root@decui-b11 ~]# gpart show da1
=> 63 83886017 da1 MBR (50G)
63 83886017 - free - (40G)
We can see the 'free' space can't grow to 50GB.
4. This can't help:
[root@decui-b11 ~]# camcontrol reprobe da1
[root@decui-b11 ~]# gpart show da1
=> 63 83886017 da1 MBR (50G)
63 83886017 - free - (40G)
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