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5a96341927
Currently alloc_extent_buffer() would make the extent buffer uptodate if the corresponding pages are also uptodate. But this check is only checking PageUptodate, which is fine for regular cases, but not for subpage cases, as we can have multiple extent buffers in the same page. So here we go btrfs_page_test_uptodate() instead. The old code doesn't cause any problem, but is not efficient, as it would cause extra metadata read even if the range is already uptodate. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@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.