Messages in this thread | | | Date | Mon, 14 Apr 2003 22:27:41 +0200 | From | Frank van Maarseveen <> | Subject | Re: Memory mapped files question |
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On Mon, Apr 14, 2003 at 04:13:52PM -0400, Richard B. Johnson wrote: > > Memory mapped files are supposed to be accessed through memory! > Any program that needs to know what's on the physical disk is > broken. If you need to write to files and know when they are > written to the physical media, you use a journaled file-system.
It is not that simple. Shared mmaped files are _never_ flushed, at least in 2.4.x. So, without an explicit msync() a process (innd comes to mind) may loose years of updates upon a system crash or power outage.
I have learned to live with it but I still find this a bit awkward.
-- Frank - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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