This patch-set restructures and cleans up struct hv_storvsc_request.
In the current code, two data structures: struct hv_storvsc_request
and struct storvsc_request_extension together are used to carry
the I/O state and there are many issues with this current
architecture:
1) The memory for extension data structure
is allocatted just after the data buffer
field in struct hv_storvsc_request resulting in comments
such as this in struct blkvsc_request (blkvsc_drv.c):
/*
* !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
* because - The extension buffer falls right here and is pointed to by
* request.Extension;
* Which sounds like a horrible idea, who designed this?
*/
2) State is unnecessarily replicated in both struct hv_storvsc_request
and the struct vstor_packet that is embedded in
struct storvsc_request_extension.
This patch-set addresses the above issues by geting rid of replicated
state and consolidating all necessary state into a single data structure.
We also deal with a range of other cleanups in this patch-set:
1) Use completion primitives to wait for completion.
2) Get rid of the synch primitive in struct blkvsc_request
3) Get rid of the need for struct hv_device to be the first
element of struct host_device_context.
Regards,
K. Y
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