cf6d1aa482
Currently, btrfs_add_ordered_extent allocates a new ordered extent, adds it to the rb_tree, but doesn't return a referenced pointer to the caller. There are cases where it is useful for the creator of a new ordered_extent to hang on to such a pointer, so add a new function btrfs_alloc_ordered_extent which is the same as btrfs_add_ordered_extent, except it takes an additional reference count and returns a pointer to the ordered_extent. Implement btrfs_add_ordered_extent as btrfs_alloc_ordered_extent followed by dropping the new reference and handling the IS_ERR case. The type of flags in btrfs_alloc_ordered_extent and btrfs_add_ordered_extent is changed from unsigned int to unsigned long so it's unified with the other ordered extent functions. Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Tested-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Boris Burkov <boris@bur.io> Signed-off-by: Christoph Hellwig <hch@lst.de> 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.