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Currently, we don't have a real feedback mechanism in place for when we start seeing buffered writeback errors. If writeback is failing, there is nothing that prevents an application from continuing to dirty pages that aren't being cleaned. In the event that we're seeing write errors of any sort occur on an inode, have the callback set a flag to force further writes to be synchronous. When the next write succeeds, clear the flag to allow buffered writeback to continue. Since this is just a hint to the write submission mechanism, we only take the i_ceph_lock when a lockless check shows that the flag needs to be changed. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: "Yan, Zheng” <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.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.