[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: How much time is needed to snyc?
On Fri, 5 Jan 2001, Gregory Schallert wrote:
> On my embedded system I would like to sync on powerdown. I'm sure jffs
> does this under normal conditions, but I am designing a small supply
> that will keep up the power in case of a power failure for enough time
> to shutdown nicely.
JFFS currently runs with O_SYNC semantics at all times - the data are
flushed to the medium before the write() call returns.
> My worse case is that I would have to write a 4Meg Ramdisk back to the
> JFFS/MTD Flash chip.
I'm not sure what you mean here. Do you mean you load a ramdisk off the
flash on boot, and write the modified copy of the ramdisk in its entirety
out to the flash on shutdown? Why?
> I can look at the specs of the Flash chip and get the worse case for
> the write, but I was wondering how much additional time is the worse
> case would JFFS take to sync?
Zero. When we start to implement write-behind, that'll change. But we'll
make sure we have a sync mount option.
To unsubscribe from this list: send the line "unsubscribe jffs-dev" in
the body of a message to firstname.lastname@example.org