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We currently don't use the location key of the btree inode, its content is set to zeroes, as it's a special inode that is not persisted (it has no inode item stored in any btree). At btrfs_ino(), an inline function used extensively in btrfs, we have this special check if the given inode's location objectid is 0, and if it is, we return the value stored in the VFS' inode i_ino field instead (which is BTRFS_BTREE_INODE_OBJECTID for the btree inode). To reduce the code at btrfs_ino(), we can simply set the objectid of the btree inode to the value BTRFS_BTREE_INODE_OBJECTID. This eliminates the need to check for the special case of the objectid being zero, with the side effect of reducing the overall code size and having less code to execute, as btrfs_ino() is an inline function. Before: $ size fs/btrfs/btrfs.ko text data bss dec hex filename 1620502 189240 29032 1838774 1c0eb6 fs/btrfs/btrfs.ko After: $ size fs/btrfs/btrfs.ko text data bss dec hex filename 1617487 189240 29032 1835759 1c02ef fs/btrfs/btrfs.ko Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Filipe Manana <fdmanana@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.