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Similarly to the support we have for testing/faking timeouts for null_blk, this adds support for triggering a requeue condition. Considering the issues around restart we've been seeing, this should be a useful addition to the testing arsenal to ensure that we are handling requeue conditions correctly. This works for queue mode 1 (legacy request_fn based path) and 2 (blk-mq path), as there's no good way to do requeue with a bio based driver. This is similar to the timeout path. For the blk-mq path, we alternate between passing back BLK_STS_RESOURCE and manually calling blk_mq_requeue_request() in the driver. The former will hit the core requeue path, while the latter exercises the IO scheduler requeue path. Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.