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Previously we held the tree mod lock when adding stuff because we use it to
check and see if we truly do want to track tree modifications. This is
admirable, but GFP_ATOMIC in a critical area that is going to get hit pretty
hard and often is not nice. So instead do our basic checks to see if we don't
need to track modifications, and if those pass then do our allocation, and then
when we go to insert the new modification check if we still care, and if we
don't just free up our mod and return. Otherwise we're good to go and we can
carry on. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
c8cc634165