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Having an nfsd thread waiting for an RDMA Read completion is problematic if the Read responder (ie, the client) stops responding. We need to go back to handling RDMA Reads by getting the svc scheduler to call svc_rdma_recvfrom() a second time to finish building an RPC message after a Read completion. This is the final patch, and makes several changes that have to happen concurrently: 1. svc_rdma_process_read_list no longer waits for a completion, but simply builds and posts the Read WRs. 2. svc_rdma_read_done() now queues a completed Read on sc_read_complete_q for later processing rather than calling complete(). 3. The completed RPC message is no longer built in the svc_rdma_process_read_list() path. Finishing the message is now done in svc_rdma_recvfrom() when it notices work on the sc_read_complete_q. The "finish building this RPC message" code is removed from the svc_rdma_process_read_list() path. This arrangement avoids the need for an nfsd thread to wait for an RDMA Read non-interruptibly without a timeout. It's basically the same code structure that Tom Tucker used for Read chunks along with some clean-up and modernization. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.