[LU-962] Add a feature to run a callback in ptlrpcd context

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.2.0
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Jinshan Xiong (Inactive)

Description

We need this functionality for async OSC RPC to support LU-884.

This is something like fake req, but it should be more well encapsulated. The interfaces would be like:

1. void *ptlrpc_allocate_work(struct obd_import *imp, int (*cb)(const struct lu_env *, void *), void *cbdata);
Initialize a callback data; handler will store a ptlrpc_request but caller shouldn't know this detail;

2. int ptlrpc_run_work(void *handler);
run the callback in ptlrpcd context if the request(handler) is NOT already in ptlrpcd list;

3. void ptlrpc_destroy_work(void *handler);

Issue Links

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