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When linking a free space entry, at link_free_space(), the caller should be holding the spinlock 'tree_lock' of the given btrfs_free_space_ctl argument, which is necessary for manipulating the red black tree of free space entries (done by tree_insert_offset(), which already asserts the lock is held) and for manipulating the 'free_space', 'free_extents', 'discardable_extents' and 'discardable_bytes' counters of the given struct btrfs_free_space_ctl. So assert that the spinlock 'tree_lock' of the given btrfs_free_space_ctl is held by the current task. We have multiple code paths that end up calling link_free_space(), and all currently take the lock before calling it. Reviewed-by: Anand Jain <anand.jain@oracle.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.