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7e5ba55994
Removing a free space entry from an in memory space cache requires having the corresponding btrfs_free_space_ctl's 'tree_lock' held. We have several code paths that remove an entry, so add assertions where appropriate to verify we are holding the lock, as the lock is acquired by some other function up in the call chain, which makes it easy to miss in the future. Note: for this to work we need to lock the local btrfs_free_space_ctl at load_free_space_cache(), which was not being done because it's local, declared on the stack, so no other task has access to it. 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.