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03793cbbc8
There is no need for most of the btrfs_io_context when doing I/O to a single device. To support such I/O without the extra btrfs_io_context allocation, turn the mirror_num argument into a pointer so that it can be used to output the selected mirror number, and add an optional argument that points to a btrfs_io_stripe structure, which will be filled with a single extent if provided by the caller. In that case the btrfs_io_context allocation can be skipped as all information for the single device I/O is provided in the mirror_num argument and the on-stack btrfs_io_stripe. A caller that makes use of this new argument will be added in the next commit. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Tested-by: Nikolay Borisov <nborisov@suse.com> Tested-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> 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.