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4811c933ea
There's a bit of a recursive conundrum around xfs_alloc_ag_vextent(). We can't first call xfs_alloc_ag_vextent() without preparing the AGFL for the allocation, and preparing the AGFL calls xfs_alloc_ag_vextent() to prepare the AGFL for the allocation. This "double allocation" requirement is not really clear from the current xfs_alloc_fix_freelist() calls that are sprinkled through the allocation code. It's not helped that xfs_alloc_ag_vextent() can actually allocate from the AGFL itself, but there's special code to prevent AGFL prep allocations from allocating from the free list it's trying to prep. The naming is also not consistent: args->wasfromfl is true when we allocated _from_ the free list, but the indication that we are allocating _for_ the free list is via checking that (args->resv == XFS_AG_RESV_AGFL). So, lets make this "allocation required for allocation" situation clear by moving it all inside xfs_alloc_ag_vextent(). The freelist allocation is a specific XFS_ALLOCTYPE_THIS_AG allocation, which translated directly to xfs_alloc_ag_vextent_size() allocation. This enables us to replace __xfs_alloc_vextent_this_ag() with a call to xfs_alloc_ag_vextent(), and we drive the freelist fixing further into the per-ag allocation algorithm. 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.