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authorNeilBrown <neilb@suse.de>2010-05-07 19:44:26 +1000
committerNeilBrown <neilb@suse.de>2010-05-07 21:10:57 +1000
commit1176568de7e066c0be9e46c37503b9fd4730edcf (patch)
tree8af6ab7cd59ef6a615048ef31d922aee76cadd57
parent87aa63000c484bfb9909989316f615240dfee018 (diff)
downloadconfigs-1176568de7e066c0be9e46c37503b9fd4730edcf.tar.gz
md: restore ability of spare drives to spin down.
Some time ago we stopped the clean/active metadata updates from being written to a 'spare' device in most cases so that it could spin down and say spun down. Device failure/removal etc are still recorded on spares. However commit 51d5668cb2e3fd1827a55 broke this 50% of the time, depending on whether the event count is even or odd. The change log entry said: This means that the alignment between 'odd/even' and 'clean/dirty' might take a little longer to attain, how ever the code makes no attempt to create that alignment, so it could take arbitrarily long. So when we find that clean/dirty is not aligned with odd/even, force a second metadata-update immediately. There are already cases where a second metadata-update is needed immediately (e.g. when a device fails during the metadata update). We just piggy-back on that. Reported-by: Joe Bryant <tenminjoe@yahoo.com> Signed-off-by: NeilBrown <neilb@suse.de> Cc: stable@kernel.org
-rw-r--r--drivers/md/md.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9712b2e97be..cefd63daff3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2109,12 +2109,18 @@ repeat:
if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
/* .. if the array isn't clean, an 'even' event must also go
* to spares. */
- if ((mddev->events&1)==0)
+ if ((mddev->events&1)==0) {
nospares = 0;
+ sync_req = 2; /* force a second update to get the
+ * even/odd in sync */
+ }
} else {
/* otherwise an 'odd' event must go to spares */
- if ((mddev->events&1))
+ if ((mddev->events&1)) {
nospares = 0;
+ sync_req = 2; /* force a second update to get the
+ * even/odd in sync */
+ }
}
}