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We used IRQ version of spinlock for ordered_tree_lock, as btrfs_finish_ordered_extent() can be called in end_bbio_data_write() which was in IRQ context. However since we're moving all the btrfs_bio::end_io() calls into task context, there is no more need to support IRQ context thus we can relax to regular spin_lock()/spin_unlock() for btrfs_inode::ordered_tree_lock. 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 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.