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authorJonathan Brassow <jbrassow@redhat.com>2007-07-12 17:29:15 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 15:01:08 -0700
commitfc1ff9588a6d56258ff9576a31aa34f17757c666 (patch)
tree071fe0a07269c656448dc5dbe453eaa8e6f1a24a
parentf44db678edcc6f4c2779ac43f63f0b9dfa28b724 (diff)
downloadop-kernel-dev-fc1ff9588a6d56258ff9576a31aa34f17757c666.zip
op-kernel-dev-fc1ff9588a6d56258ff9576a31aa34f17757c666.tar.gz
dm raid1: handle log failure
When writing to a mirror, the log must be updated first. Failure to update the log could result in the log not properly reflecting the state of the mirror if the machine should crash. We change the return type of the rh_flush function to give us the ability to check if a log write was successful. If the log write was unsuccessful, we fail the writes to avoid the case where the log does not properly reflect the state of the mirror. A follow-up patch - which is dependent on the ability to requeue I/O's to core device-mapper - will requeue the I/O's for retry (allowing the mirror to be reconfigured.) Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/md/dm-raid1.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index dee4221..1a876f9 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -134,6 +134,7 @@ struct mirror_set {
/* recovery */
region_t nr_regions;
int in_sync;
+ int log_failure;
struct mirror *default_mirror; /* Default mirror */
@@ -589,9 +590,9 @@ static void rh_recovery_end(struct region *reg, int success)
wake(rh->ms);
}
-static void rh_flush(struct region_hash *rh)
+static int rh_flush(struct region_hash *rh)
{
- rh->log->type->flush(rh->log);
+ return rh->log->type->flush(rh->log);
}
static void rh_delay(struct region_hash *rh, struct bio *bio)
@@ -892,12 +893,15 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
*/
rh_inc_pending(&ms->rh, &sync);
rh_inc_pending(&ms->rh, &nosync);
- rh_flush(&ms->rh);
+ ms->log_failure = rh_flush(&ms->rh) ? 1 : 0;
/*
* Dispatch io.
*/
- while ((bio = bio_list_pop(&sync)))
+ if (unlikely(ms->log_failure))
+ while ((bio = bio_list_pop(&sync)))
+ bio_endio(bio, bio->bi_size, -EIO);
+ else while ((bio = bio_list_pop(&sync)))
do_write(ms, bio);
while ((bio = bio_list_pop(&recover)))
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