On 6/13/14, 2:44 PM, JP Abgrall wrote: > On Fri, Jun 13, 2014 at 7:31 AM, Theodore Ts'o <tytso@xxxxxxx> wrote: <snip> > >> If so, you might be better off either doing per-file encryption, or >> per-file secure discard. > > The per-file secure discard seems to be the way to go, as there are > only a few places in Android where this needs to be turned on. > The current idletime-fstrim would switch from FITRIM to SFITRIM to > reduce the leftovers. Apologies if this is a dumb thing to point out, but... mmc is the only in-kernel driver (aside from xen) which can even set the flags necessary to enable secure discard; and then only if mmc_can_secure_erase_trim() is true, so it depends on the card, I guess. I don't know what device you're running on, but figured it might be worth pointing out that not all hardware even supports this capability. -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
