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Now that the filestreams AG selection tracks active perags, we need to return an active perag to the core allocator code. This is because the file allocation the filestreams code will run are AG specific allocations and so need to pin the AG until the allocations complete. We cannot rely on the filestreams item reference to do this - the filestreams association can be torn down at any time, hence we need to have a separate reference for the allocation process to pin the AG after it has been selected. This means there is some perag juggling in allocation failure fallback paths as they will do all AG scans in the case the AG specific allocation fails. Hence we need to track the perag reference that the filestream allocator returned to make sure we don't leak it on repeated allocation failure. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
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.