From: Nick Piggin Subject: Re: ftruncate-mmap: pages are lost after writing to mmaped file. Date: Thu, 2 Apr 2009 22:24:29 +1100 Message-ID: <200904022224.31060.nickpiggin@yahoo.com.au> References: <604427e00903181244w360c5519k9179d5c3e5cd6ab3@mail.gmail.com> <20090324173511.GJ23439@duck.suse.cz> <604427e00904011536i6332a239pe21786cc4c8b3025@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Jan Kara , "Martin J. Bligh" , linux-ext4@vger.kernel.org, Linus Torvalds , Andrew Morton , "linux-kernel" , "linux-mm" , guichaz@gmail.com, Alex Khesin , Mike Waychison , Rohit Seth , Peter Zijlstra To: Ying Han Return-path: Received: from smtp106.mail.mud.yahoo.com ([209.191.85.216]:21299 "HELO smtp106.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751218AbZDBLYi (ORCPT ); Thu, 2 Apr 2009 07:24:38 -0400 In-Reply-To: <604427e00904011536i6332a239pe21786cc4c8b3025@mail.gmail.com> Content-Disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: On Thursday 02 April 2009 09:36:13 Ying Han wrote: > Hi Jan: > I feel that the problem you saw is kind of differnt than mine. As > you mentioned that you saw the PageError() message, which i don't see > it on my system. I tried you patch(based on 2.6.21) on my system and > it runs ok for 2 days, Still, since i don't see the same error message > as you saw, i am not convineced this is the root cause at least for > our problem. I am still looking into it. > So, are you seeing the PageError() every time the problem happened? So I asked if you could test with my workaround of taking truncate_mutex at the start of ext2_get_blocks, and report back. I never heard of any response after that. To reiterate: I was able to reproduce a problem with ext2 (I was testing on brd to get IO rates high enough to reproduce it quite frequently). I think I narrowed the problem down to block allocation or inode block tree corruption because I was unable to reproduce it with that hack in place.