On 10/19/2016 06:41 AM, Maxim Patlasov wrote: > Previos patch adding support for dm-crypt ploops naively suggested > that every time we build dm-crypt device, crypt_ctr() is called, and > vice versa - every time we dismantle it, crypt_dtr() is called. But > in practice, crypt_ctr/dtr is called more than once because md->map > is RCU-protected. For example, during resize, new dm target is > constructed and registetred in md->map, then the former md->map is > released. > > Only dm-crypt knows how to find underlaying ploop device. That's why > the patch implements ploop_modify methods of dm-crypt target. And > only general dm code (dm.c, dm-table.c, dm-ioctl.c and friends) knows > which instance of dm-target is actual and which is obsoleted. That's > why the patch orchestrates calling this new method from general code, > close to __bind/__unbind managing md->map pointer. > > https://jira.sw.ru/browse/PSBM-53386 > > Signed-off-by: Maxim Patlasov <mpatla...@virtuozzo.com>
Reviewed-by: Andrey Ryabinin <aryabi...@virtuozzo.com> _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
