From: Mikulas Patocka Date: Tue, 16 Feb 2010 18:42:55 +0000 (+0000) Subject: dm raid1: fail writes if errors are not handled and log fails X-Git-Tag: v2.6.32.30~46 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6934e92473f477a70ce50d83105a5ae346d1fb2c;p=karo-tx-linux.git dm raid1: fail writes if errors are not handled and log fails commit 5528d17de1cf1462f285c40ccaf8e0d0e4c64dc0 upstream. If the mirror log fails when the handle_errors option was not selected and there is no remaining valid mirror leg, writes return success even though they weren't actually written to any device. This patch completes them with EIO instead. This code path is taken: do_writes: bio_list_merge(&ms->failures, &sync); do_failures: if (!get_valid_mirror(ms)) (false) else if (errors_handled(ms)) (false) else bio_endio(bio, 0); The logic in do_failures is based on presuming that the write was already tried: if it succeeded at least on one leg (without handle_errors) it is reported as success. Reference: https://bugzilla.redhat.com/show_bug.cgi?id=555197 Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon Cc: maximilian attems Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index cc9dc79b0784..6021d0a9012d 100644 --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -659,7 +659,7 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes) /* * Dispatch io. */ - if (unlikely(ms->log_failure)) { + if (unlikely(ms->log_failure) && errors_handled(ms)) { spin_lock_irq(&ms->lock); bio_list_merge(&ms->failures, &sync); spin_unlock_irq(&ms->lock);