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From: Ingo Oeser <ioe-lkml@rameria.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
	peterz@infradead.org, salikhmetov@gmail.com, linux-mm@kvack.org,
	jakob@unthought.net, linux-kernel@vger.kernel.org,
	valdis.kletnieks@vt.edu, riel@redhat.com, ksm@42.dk,
	staubach@redhat.com, jesper.juhl@gmail.com,
	akpm@linux-foundation.org, protasnb@gmail.com,
	r.e.wolff@bitwizard.nl, hidave.darkstar@gmail.com,
	hch@infradead.org
Subject: Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files
Date: Fri, 18 Jan 2008 23:32:00 +0100	[thread overview]
Message-ID: <200801182332.02945.ioe-lkml@rameria.de> (raw)
In-Reply-To: <alpine.LFD.1.00.0801181127000.2957@woody.linux-foundation.org>

Hi Linus,

On Friday 18 January 2008, Linus Torvalds wrote:
> On Fri, 18 Jan 2008, Miklos Szeredi wrote:
> > 
> > What I'm saying is that the times could be left un-updated for a long
> > time if program doesn't do munmap() or msync(MS_SYNC) for a long time.
> 
> Sure.
> 
> But in those circumstances, the programmer cannot depend on the mtime 
> *anyway* (because there is no synchronization), so what's the downside?

Can we get "if the write to the page hits the disk, the mtime has hit the disk
already no less than SOME_GRANULARITY before"? 

That is very important for computer forensics. Esp. in saving your ass!

Ok, now back again to making that fast :-)


Best Regards

Ingo Oeser

  parent reply	other threads:[~2008-01-18 22:29 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-17 22:31 [PATCH -v6 0/2] Fixing the issue with memory-mapped file times Anton Salikhmetov
2008-01-17 22:31 ` [PATCH -v6 1/2] Massive code cleanup of sys_msync() Anton Salikhmetov
2008-01-18  9:33   ` Miklos Szeredi
2008-01-18 10:30     ` Anton Salikhmetov
2008-01-17 22:31 ` [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files Anton Salikhmetov
2008-01-18  9:51   ` Miklos Szeredi
2008-01-18 10:15     ` Peter Zijlstra
2008-01-18 10:25       ` Peter Zijlstra
2008-01-18 10:39         ` Anton Salikhmetov
2008-01-18 17:58         ` Linus Torvalds
2008-01-18 18:11           ` Miklos Szeredi
2008-01-18 18:28             ` Rik van Riel
2008-01-18 18:51               ` Miklos Szeredi
2008-01-18 18:43             ` Linus Torvalds
2008-01-18 18:57               ` Miklos Szeredi
2008-01-18 19:08                 ` Linus Torvalds
2008-01-18 19:22                   ` Miklos Szeredi
2008-01-18 19:35                     ` Linus Torvalds
2008-01-18 19:58                       ` Anton Salikhmetov
2008-01-18 20:22                         ` Linus Torvalds
2008-01-18 21:03                           ` Anton Salikhmetov
2008-01-18 21:27                             ` Linus Torvalds
2008-01-18 22:04                               ` Anton Salikhmetov
2008-01-18 22:21                                 ` Linus Torvalds
2008-01-18 22:35                                   ` Anton Salikhmetov
2008-01-18 22:32                       ` Ingo Oeser [this message]
2008-01-18 22:47                         ` Linus Torvalds
2008-01-18 22:54                           ` Rik van Riel
2008-01-19  0:50                             ` Matt Mackall
2008-01-19  4:25                               ` Rik van Riel
2008-01-19 10:22                               ` Miklos Szeredi
2008-01-19 15:49                                 ` Matt Mackall
2008-01-21 14:25                           ` Peter Staubach
2008-01-21 14:36                             ` Anton Salikhmetov
2008-01-18 10:38       ` Miklos Szeredi
2008-01-18 11:00         ` Peter Zijlstra
2008-01-18 11:17           ` Miklos Szeredi
2008-01-18 11:23             ` Peter Zijlstra
2008-01-18 11:36               ` Miklos Szeredi
2008-01-18  9:40 ` [PATCH -v6 0/2] Fixing the issue with memory-mapped file times Miklos Szeredi
2008-01-18 10:31   ` Anton Salikhmetov
2008-01-18 19:48   ` Anton Salikhmetov
2008-01-19 10:45     ` Miklos Szeredi

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