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When locking the entire group in order to remove subrequests, the locks are always taken in order, and with the page group lock being taken after the page head is locked. The intention is that: 1) The lock on the group head guarantees that requests may not be removed from the group (although new entries could be appended if we're not holding the group lock). 2) It is safe to drop and retake the page group lock while iterating through the list, in particular when waiting for a subrequest lock. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> |
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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.