c17ea00961
If virtqueue is full, we put forget requests on a list and these forgets are dispatched later using a worker. As of now we don't count these forgets in fsvq->in_flight variable. This means when queue is being drained, we have to have special logic to first drain these pending requests and then wait for fsvq->in_flight to go to zero. By counting pending forgets in fsvq->in_flight, we can get rid of special logic and just wait for in_flight to go to zero. Worker thread will kick and drain all the forgets anyway, leading in_flight to zero. I also need similar logic for normal request queue in next patch where I am about to defer request submission in the worker context if queue is full. This simplifies the code a bit. Also add two helper functions to inc/dec in_flight. Decrement in_flight helper will later used to call completion when in_flight reaches zero. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.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.