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Date: Wed, 15 Jan 2020 04:03:49 +0530 From: Ritesh Harjani <riteshh@...ux.ibm.com> To: Christoph Hellwig <hch@...radead.org> Cc: linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz, darrick.wong@...cle.com Subject: Re: [RFC 0/2] ext4: Fix stale data read exposure problem with DIO read/page_mkwrite On 1/14/20 10:09 PM, Christoph Hellwig wrote: >> Currently there is a small race window as pointed out by Jan [2] where, when >> ext4 tries to allocate a written block for mapped files and if DIO read is in >> progress, then this may result into stale data read exposure problem. > > Do we have a test case for the problem? I am not very sure if we have it in xfstests, (since I guess, DIO read during mmap writes is not well supported anyways). But sure I was anyway thinking of writing one for my unit testing. Till now I was mainly following that theoretically it is possible, although it may be hard to catch it practically. > Please add at very least the fsdevel and xfs lists to iomap patches. Yes, sorry about that. Will cc' in next time. -ritesh
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