On Tue, 2009-03-03 at 11:41 +0100, Nick Piggin wrote: > page_mkwrite is called with neither the page lock nor the ptl held. This > means a page can be concurrently truncated or invalidated out from underneath > it. Callers are supposed to prevent truncate races themselves, however > previously the only thing they can do in case they hit one is to raise a > SIGBUS. A sigbus is wrong for the case that the page has been invalidated > or truncated within i_size (eg. hole punched). Callers may also have to > perform memory allocations in this path, where again, SIGBUS would be wrong. > > The previous patch made it possible to properly specify errors. Convert > the generic buffer.c code and btrfs to return sane error values > (in the case of page removed from pagecache, VM_FAULT_NOPAGE will cause the > fault handler to exit without doing anything, and the fault will be retried > properly). > Thanks Nick. I think the btrfs patch needs an extra } to compile, but it looks fine. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
