Remove inlines of large functions to decrease code size (saved 1543
bytes).
Signed-off-by: NJan Kara <jack@suse.cz>

Remove bogus typedef which is just a definition of char *.
Remove unnecessary type casts.
Substitute freedqbuf() with kfree.
Signed-off-by: NJan Kara <jack@suse.cz>

Remove this macro which is just a definition of NULL. Fix a few coding style
issues along the way.
Signed-off-by: NJan Kara <jack@suse.cz>

Andrew Morton has suggested that three global quota locks can end up in the
same cacheline which can result in bad cacheline ping-pong on SMP machines.
Make locks cacheline aligned so that we avoid this problem (thanks goes to
Andrew for the idea).
Signed-off-by: NJan Kara <jack@suse.cz>
CC: Andrew Morton <akpm@linux-foundation.org>

Quota subsystem has more and more files. It's time to create a dir for it.
Signed-off-by: NJan Kara <jack@suse.cz>