3cce39a8ca
Use xarray to track dirty extents to reduce the size of the struct btrfs_qgroup_extent_record from 64 bytes to 40 bytes. The xarray is more cache line friendly, it also reduces the complexity of insertion and search code compared to rb tree. Another change introduced is about error handling. Before this patch, the result of btrfs_qgroup_trace_extent_nolock() is always a success. In this patch, because of this function calls the function xa_store() which has the possibility to fail, so mark qgroup as inconsistent if error happened and then free preallocated memory. Also we preallocate memory before spin_lock(), if memory preallcation failed, error handling is the same the existing code. Suggested-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Junchao Sun <sunjunchao2870@gmail.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.