Update rollup for the SIS component in Windows Storage Server 2008 R2

This is a Single Instance Storage (SIS) update rollup for Windows Storage Server 2008 R2 and Windows Server 2008 R2. This update rollup resolves the following issues:

Issue 1
After a file is truncated to empty size on a SIS volume by using CreateFile with the TRUNCATE_EXISTING creation disposition:
If the file is read without reopening it, the system may return data as if the file was not truncated. For example, if the original file is 2 megabytes (MB) and is opened by using CreateFile with the TRUNCATE_EXISTING creation disposition. When the first 1 MB is read, the system may return the original 1 MB of content even though the file size is zero.
If the file is written without reopening it, the system may behave as if the file was not truncated. For example, if the original file is 2 MB and is opened by using CreateFile with the TRUNCATE_EXISTING creation disposition. When the first 1 MB is written with new data, the new file may be 2 MB with the first 1 MB of new data and second 1 MB of original data.

Issue 2
When a file is compressed or decompressed on a SIS volume and the file was previously changed and the modification was interrupted or failed, the file may be corrupted.

Issue 3
When a file is accessed on a SIS volume and the volume is under a high stress situation, the server may stop responding to all requests to the SIS volume.

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