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Fix crash on WinPE #163

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Fix crash on WinPE #163

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Commits on Jul 13, 2023

  1. Detect RAM disks as a separate filesystem type 

    Native RAM disks, e.g. as are used in WinPE environments, have other
characteristics than regular filesystems such as NTFS. For instance,
re-opening files with NtOpenFile is buggy.

This commit checks whether a volume is a RAM disk through the NT object
the drive letter link refers to. This seems to be the only reliable
method of checking whether a volume is a native RAM disk.
    @lesderid
    lesderid committed Jul 13, 2023
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  2. Use init_reopen_attr in mmap 

    Calling mmap on a file stored on a volume with buggy file re-opening
currently bugchecks. This commit solves this by using the
init_reopen_attr helper function.

Fixes msys2#160
    @lesderid
    lesderid committed Jul 13, 2023
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