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Subject[PATCH 002 of 9] md: Skip all metadata update processing when using external metadata.

All the metadata update processing for external metadata is on
in user-space or through the sysfs interfaces, so make "md_update_sb"
a no-op in that case.

Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./drivers/md/md.c | 2 ++
1 file changed, 2 insertions(+)
diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c 2008-04-29 12:27:55.000000000 +1000
+++ ./drivers/md/md.c 2008-04-29 12:27:56.000000000 +1000
@@ -1651,6 +1651,8 @@ static void md_update_sb(mddev_t * mddev
int sync_req;
int nospares = 0;

+ if (mddev->external)
+ return;
repeat:
spin_lock_irq(&mddev->write_lock);


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