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Message-ID: <20110614153630.023eeeef@lxorguk.ukuu.org.uk> Date: Tue, 14 Jun 2011 15:36:30 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: markgross@...gnar.org Cc: Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>, Raffaele Recalcati <lamiaposta71@...il.com>, linux-pm@...ts.linux-foundation.org, davinci-linux-open-source@...ux.davincidsp.com, linux-kernel@...r.kernel.org Subject: Re: [linux-pm] pm loss development > I know nothing about journalling file systems or how well they limit the > critical sections of time where the file system is exposed to corruption > from sudden power failure. Its an interesting question though. A properly written journalling file system has no critical sections. The only things it relies upon are - store ordering in the drive working properly - a single disk block write being atomic the former is well specified even for ATA devices, the latter is a pretty safe property of rotating media, although in theory you have a finite chance of getting a bad sector. For flash it's a lot lot more complicated but for a flash device claiming to be ATA compliant you ought to get ATA behaviour. All that said there is still (as ever) a tiny chance your system may malfunction. It's all down to probabilities and if your laptop explodes you need a backup (trust me, I've tested this case). Alan -- 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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