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The replay cursor should be updated properly when close happened during replay, otherwise, ptlrpc_replay_next() could run into a dead loop due to an invalid replay cursor: - replay cursor is moved to an open request during replay; - application close that open file, so the rq_replay of the open request is cleared; - ptlrpc_replay_next() calls ptlrpc_free_committed() to free committed/closed requests, the open request is removed from the committed list, so the replay cursor is changed to an empty list_head now. The open request won't be freed now since it's still held by the pending close request; - ptlrpc_replay_next() continue to move the replay cursor to next and run into a dead loop at the end; Another change in this patch is to remove the out of date comments in ptlrpc_replay_next() and cover the whole process of finding replay request within imp_lock, because: 1. With two separated replay lists and replay cursor introduced, finding replay request won't take much time as before, it's not necessary to do this "lock -> unlock -> lock -> unlock" trick anymore; 2. Nowadays there are various kind of non-replay requests are allowed during recovery, so ptlrpc_free_committed() may run in parallel to remove an open request while ptlrpc_replay_next() is iterating the open requests list; Signed-off-by: Niu Yawei <yawei.niu@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8765 Reviewed-on: https://review.whamcloud.com/23418 Reviewed-by: Yang Sheng <yang.sheng@intel.com> Reviewed-by: John L. Hammond <john.hammond@intel.com> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: James Simmons <jsimmons@infradead.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.