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Message-ID: <20110520033949.GQ32466@dastard> Date: Fri, 20 May 2011 13:39:49 +1000 From: Dave Chinner <david@...morbit.com> To: d.g.jansen@...glemail.com Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, tytso@....edu Subject: Re: [rfc] Ignore Fsync Calls in Laptop_Mode On Thu, May 19, 2011 at 03:34:46PM +0200, Dennis Jansen wrote: > This is my first proper kernel code proposal so please bear with me! > > =Summary for busy kernel hackers= > Problem: laptop_mode wants to keep applications from waking the hard > disks but fsync calls can "sneak through". (IMHO this is a bug.) > > Proposed solution: Pretend the fsync was executed and successful. > Insert two lines into the fsync and fdatasync calls in fs/sync.c: > if (unlikely(laptop_mode)) > return 0; No, no, no, no, no, no, no, no, no, no. There is _absolutely no justification_ for putting people's data at risk like this. If you want to do make fsync/fdatasync calls no-ops, then go install libeatmydata on your systems. It's your data, and you make the decision to risk it, not us. And BTW, I just added your name to my "ignore fileystem/data corruption bug reports from these people" list, because that's exactly where you'll end up with if you follow this path. Cheers, Dave. -- Dave Chinner david@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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