Btrfs: introduce common define for max number of mirrors
Readahead already has a define for the max number of mirrors. Scrub needs such a define now, the rest of the code will need something like this soon. Therefore the define was added to ctree.h and removed from the readahead code. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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