On Sun, 2009-11-22 at 12:42 +0100, Wouter van Heyst wrote: > On Mon, Nov 16, 2009 at 10:31:49PM +0000, Ben Hutchings wrote: [...] > > In general, it is not possible to tell whether a card present in an MMC > > slot after resume is the same that was there before suspend. So there > > are two possible behaviours, each of which will cause data loss in some > > cases: > > > > CONFIG_MMC_UNSAFE_RESUME=n (default): Cards are assumed to be removed > > during suspend. Any filesystem on them must be unmounted before > > suspend; otherwise, buffered writes will be lost. > > > > CONFIG_MMC_UNSAFE_RESUME=y: Cards are assumed to remain present during > > suspend. They must not be swapped during suspend; otherwise, buffered > > writes will be flushed to the wrong card. > > > > Currently the choice is made at compile time and this allows that to be > > overridden at module load time. > > I'm running 2.6.32-rc7 with this patch applied and CONFIG_MMC_UNSAFE_RESUME=y > That works as desired for my non-removable case. Is it desired that I > test if 'removable=1' will thrash my filesystem? Please test with CONFIG_MMC_UNSAFE_RESUME=n (which Debian will continue to use) and removable=0. Ben. -- Ben Hutchings Unix is many things to many people, but it's never been everything to anybody.
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