Hello,
this patch set changes quota code to use s_umount semaphore for serialization
of quota on/off operations among each other and with other quotactl and
quota writeback operations. So far we have used dedicated dqonoff_mutex but
that triggered lockdep warnings during fs freezing and also unnecessarily
serialized some quotactl operations.
Al, any objections to patch 1/7 exporting functionality to get superblock with
s_umount in exclusive mode? Alternatively I could add a wrapper around
get_super_thawed() in quota code to drop s_umount & get it in exclusive mode
and recheck that superblock didn't get unmounted / frozen but what I did here
looked cleaner to me.
OCFS2 guys, it would be good if you could test ocfs2 quotas with this patch set
in some multi-node setup (I have tested just with a single node), especially
whether quota file recovery for other nodes still works as expected. Thanks.
If nobody objects, I'll push these changes through my tree to Linus.
Honza
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