From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id A9A1A6B003D for ; Thu, 2 Apr 2009 07:24:14 -0400 (EDT) From: Nick Piggin Subject: Re: ftruncate-mmap: pages are lost after writing to mmaped file. Date: Thu, 2 Apr 2009 22:24:29 +1100 References: <604427e00903181244w360c5519k9179d5c3e5cd6ab3@mail.gmail.com> <20090324173511.GJ23439@duck.suse.cz> <604427e00904011536i6332a239pe21786cc4c8b3025@mail.gmail.com> In-Reply-To: <604427e00904011536i6332a239pe21786cc4c8b3025@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200904022224.31060.nickpiggin@yahoo.com.au> Sender: owner-linux-mm@kvack.org To: Ying Han 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 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org