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a9501d7421
In r5l_log_endio(), once log->io_list_lock is released, the io unit may be accessed (or even freed) by other threads. Current code doesn't handle the io_unit properly, which leads to potential race conditions. This patch solves this race condition by: 1. Add a pending_stripe count flush_payload. Multiple flush_payloads are counted as only one pending_stripe. Flag has_flush_payload is added to show whether the io unit has flush_payload; 2. In r5l_log_endio(), check flags has_null_flush and has_flush_payload with log->io_list_lock held. After the lock is released, this IO unit is only accessed when we know the pending_stripe counter cannot be zeroed by other threads. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.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.