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In order to detect when a direct READ is possible, we need the send buffer's .page_len to be zero when there is nothing in the buffer's .pages array yet. However, when xdr_reserve_space_vec() extends the size of the xdr_stream to accommodate a READ payload, it adds to the send buffer's .page_len. It should be safe to reserve the stream space /after/ the VFS read operation completes. This is, for example, how an NFSv3 READ works: the VFS read goes into the rq_bvec, and is then added to the send xdr_stream later by svcxdr_encode_opaque_pages(). Now that xdr_reserve_space_vec() uses the number of bytes actually read, the xdr_truncate_encode() call is no longer necessary. Reviewed-by: NeilBrown <neil@brown.name> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.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 reStructuredText 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.