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SubjectQuota speedup in 2.2.12 and bugfix
  Hello.

I'm sending you a small patch to quota code in 2.2.12. It does two things:

1) Fixes possible race in sync_dquots() where we could end up writing invalidated quota.
2) Speeds up quotaoff - currently when inode cache was full of inodes with quota pointers
set, which is likely when quota enabled on root, quotaoff could take a few seconds
which is unpleasant. So I made a bit more finegrained detection of blocking when we
remove references from inodes and so we don't have to restart so often.

The patch is attached.

Bye
Honza.


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