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| author | NeilBrown <neilb@suse.de> | 2010-05-07 19:44:26 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-05-07 21:10:57 +1000 |
| commit | 1176568de7e066c0be9e46c37503b9fd4730edcf (patch) | |
| tree | 8af6ab7cd59ef6a615048ef31d922aee76cadd57 /drivers/md | |
| parent | 87aa63000c484bfb9909989316f615240dfee018 (diff) | |
| download | linux-1176568de7e066c0be9e46c37503b9fd4730edcf.tar.gz linux-1176568de7e066c0be9e46c37503b9fd4730edcf.tar.bz2 linux-1176568de7e066c0be9e46c37503b9fd4730edcf.zip | |
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
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 9712b2e97be4..cefd63daff31 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 */ + } } } |