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e5e886bad9
We don't use a cached state here at all, which generally makes sense as async reads are going to unlock at endio time. However for blocking reads we will call wait_extent_bit() for our range. Since the lock_extent() stuff will return the cached_state for the start of the range this is a helpful optimization to have for this case, we'll have the exact state we want to wait on. Add a cached state here and simply throw it away if we're a non-blocking read, otherwise we'll get a small improvement by eliminating some tree searches. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.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.