[ros-kernel] Recent changes to vfatfs broken

[Phillip S. <ps...@cf...>]

It seems that the recent changes to vfatfs to allow async IO are 
broken.  When attempting to mount the filesystem, VfatBuildRequest() calls 
FsRtlEnterFileSystem() which is a #define to KeEnterCriticalRegion, which 
disables APCs.  This causes VfatFileSystemControl to be called with APCs 
disabled, which prevents the read IO issued to read the boot sector to not 
complete.

What is the purpose of calling FsRtlEnterFileSystem(), and I seem to 
remember reading that IO completions use special APCs that can not be 
disabled, so the APC should be delivered anyway.  Is it then the case that 
we need to use these special APCs to allow delivery even though APCs have 
been disabled for some reason?

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