Cc may decide to process deferred writes any time, so the context might
already be freed by the time we return from CcDeferWrite.
Also mark the IRP as pending, since we're going to return STATUS_PENDING.
This avoids race conditions under high IOs and thus corruption on
the FS, or assertions failures in the kernel.
Easily triggered by building ReactOS on ReactOS ;-).
Before performing a read operation, FastFAT driver will
attempt to compute whether it would run out of stack
during the operation. If so, instead of attempting the
operation in the current thread, it will post the read
request to the overflow thread.
This should help with the regressions brought in by
94ead99e0c.
CORE-14601
Before any write operation that would involve caching, ask
the cache controler whether writing would make it exceed its memory
consumption. If so, queue the write operation for later execution.
In case the write operation can wait, then, the FSD operation will be
halted until the write is allowed.
I could test it successfully by copying huge files from a FAT volume to
another. The write is halted until some portions of the file is written
to the disk.
I could also properly install Qt (SDK) on ReactOS with this and less than 1GB RAM:
- https://www.heisspiter.net/~Pierre/rostests/Qt_OS.png
- https://www.heisspiter.net/~Pierre/rostests/Qt_OS2.png
CORE-12081
CORE-14582
CORE-14313
