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14033b08a0
The extent tree v2 needs a new root for storing all block group items, the whole feature hasn't been finished yet so we can afford to do some changes. My initial proposal years ago just added a new tree rootid, and load it from tree root, just like what we did for quota/free space tree/uuid/extent roots. But the extent tree v2 patches introduced a completely new way to store block group tree root into super block which is arguably wasteful. Currently there are only 3 trees stored in super blocks, and they all have their valid reasons: - Chunk root Needed for bootstrap. - Tree root Really the entry point for all trees. - Log root This is special as log root has to be updated out of existing transaction mechanism. There is not even any reason to put block group root into super blocks, the block group tree is updated at the same time as the old extent tree, no need for extra bootstrap/out-of-transaction update. So just move block group root from super block into tree root. Signed-off-by: Qu Wenruo <wqu@suse.com> 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.