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d817ce35d2
Currently btrfs uses end_io functions to jump between different stages of recovery. For example, we go the following different functions: - raid56_bio_end_io() This handles the read for all the sectors (except the missing device). - __raid_recover_end_io() This does the real work, it's called inside the delayed work function raid_recover_end_io_work(). This one recovery path involves at least 3 different functions, which is a big burden for readers. This patch will change the behavior by: - Introduce a unified recovery entrance, recover_rbio() - Use submit-and-wait method So the workflow is not interrupted by the endio function jump. This doesn't bring performance change, but reduce the burden for reviewers. - Run the main function in the rmw_workers workqueue Now raid56_parity_recover() only needs to setup the work, and queue the work using start_async_work(). Now readers only need to do one function jump (start_async_work()) to find out the main entrance of recovery path. Furthermore, recover_rbio() function can easily be reused by other paths. The old recovery path is still utilized by degraded write path. It will be cleaned up when we have migrated the write path. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.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.