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71df088c1c
The btrfs zoned completion code currently needs an ordered_extent and extent_map per bio so that it can account for the non-predictable write location from Zone Append. To archive that it currently splits the ordered_extent and extent_map at I/O submission time, and then records the actual physical address in the ->physical field of the ordered_extent. This patch instead switches to record the "original" physical address that the btrfs allocator assigned in spare space in the btrfs_bio, and then rewrites the logical address in the btrfs_ordered_sum structure at I/O completion time. This allows the ordered extent completion handler to simply walk the list of ordered csums and split the ordered extent as needed. This removes an extra ordered extent and extent_map lookup and manipulation during the I/O submission path, and instead batches it in the I/O completion path where we need to touch these anyway. Reviewed-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.