From 738a84b25cac5af94936e5a1b15cd9909212383c Mon Sep 17 00:00:00 2001 From: Philipp Reisner Date: Thu, 3 Mar 2011 00:21:30 +0100 Subject: drbd: Fix for application IO with the on-io-error=pass-on policy In case a write failes on the local disk, go into D_INCONSISTENT disk state. That causes future reads of that block to be shipped to the peer. Read retry remote was already in place. Actually the documentation needs to get fixed now. Since the application is still shielded from the error. (as long as we have only a single disk failing) The difference to detach is that we keep the disk. And therefore might keep all the other, still working sectors up to date. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_int.h | 1 + drivers/block/drbd/drbd_main.c | 4 ++++ 2 files changed, 5 insertions(+) (limited to 'drivers/block/drbd') diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index b2699bb2e530..2c38752ca8d6 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1827,6 +1827,7 @@ static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, if (!forcedetach) { if (__ratelimit(&drbd_ratelimit_state)) dev_err(DEV, "Local IO failed in %s.\n", where); + _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_HARD, NULL); break; } /* NOTE fall through to detach case if forcedetach set */ diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 5b525c179f39..fd308864833f 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1565,6 +1565,10 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, put_ldev(mdev); } + /* Notify peer that I had a local IO error, and did not detached.. */ + if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT) + drbd_send_state(mdev); + /* Disks got bigger while they were detached */ if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { -- cgit v1.2.3-59-g8ed1b