Coywolf Qi Hunt writes:
> 2005/12/20, Sander <[email protected]>:
> > Coywolf Qi Hunt wrote (ao):
[...]
> > > IMHO, umount doesn't guarantee sync, isn't it?
>
> Actually I was think umount(2), since this is the kernel list, but off
> topic here.
>
> >
> > I'm pretty sure it does :-)
>
> That is because: usually your removable media is not the file system
> root, hence umount(8) can return successfully only if no processes are
> busy working on it.
>
> If you boot from or chroot/pivot into a removable media, and you
> remount it ro, and unplug it, then you may lose data.
sys_umount() writes all cached data back, see generic_shutdown_super()->fsync_super()
>
> -- coywolf
Nikita.
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