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There are several operations, usually started from ioctls, that cannot run concurrently. The status is tracked in mutually_exclusive_operation_running as an atomic_t. We can easily track the status as one of the per-filesystem flag bits with same synchronization guarantees. The conversion replaces: * atomic_xchg(..., 1) -> test_and_set_bit(FLAG, ...) * atomic_set(..., 0) -> clear_bit(FLAG, ...) Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.