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Consolidate reading the number of extents and computing the return value in the map_id_down, map_id_range_down and map_id_range. This removal of one read of extents makes one smp_rmb unnecessary and makes the code safe it is executed during the map write. Reading the number of extents twice and depending on the result being the same is not safe, as it could be 0 the first time and > 5 the second time, which would lead to misinterpreting the union fields. The consolidation of the return value just removes a duplicate caluculation which should make it easier to understand and maintain the code. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.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.