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Subject: [Bug 211000] [Hyper-V] Online VHDX Resize doesn't work properly
Date: Mon, 11 Jul 2016 09:43:29 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: CURRENT
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X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: decui@microsoft.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211000

            Bug ID: 211000
           Summary: [Hyper-V] Online VHDX Resize doesn't work properly
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: decui@microsoft.com

Hyper-V has a feature called Online VHDX Resize: the disk capacity can be
    changed by the host when the VM is running. Note: the host doesn't noti=
fy
    the VM of the capacity change proactively; when the VM sends the next I=
/O
    request to the host, the host will report an error (SCSI_STATUS_CHECK_C=
OND)
    with sense data supplied (the sense data indicates a disk capacity chan=
ge)
    and the VM is supposed to check and handle the capacity change properly,
    and re-submit the I/O request.

    However, the current I/O response handling in the VM has a bug: the hos=
t's
    response's status is lost unintentionally, so the upper SCSI layer in t=
he
VM
    always thinks the I/O request is completed successfully while it's not
(this
    causes undefined behaviors), and ignores the sense data.

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