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At btrfs_qgroup_cleanup_dropped_subvolume() all we want to commit the current transaction in order to have all the qgroup rfer/excl numbers up to date. However we are using btrfs_start_transaction(), which joins the current transaction if there is one that is not yet committing, but also starts a new one if there is none or if the current one is already committing (its state is >= TRANS_STATE_COMMIT_START). This later case results in unnecessary IO, wasting time and a pointless rotation of the backup roots in the super block. So instead of using btrfs_start_transaction() followed by a btrfs_commit_transaction(), use btrfs_commit_current_transaction() which achieves our purpose and avoids starting and committing new transactions. Reviewed-by: Qu Wenruo <wqu@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 reStructuredText 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.