Zach Brown c3f122a5f1 Fix mkfs buddy initialization ...

mkfs was starting setting free blk bits from 0 instead of from
the blkno offset of the first free block.  This resulted in
the highest order above a used blkno being marked free.  Freeing
that blkno would set its lowest order blkno.  Now that blkno can be
allocated from two orders.  That, eventually, can lead to blocks
being doubly allocated and users trampling on each other.

While auditing the code to chase this bug down I also noticed that
write_buddy_blocks() was using a min() that makes no sense at all.  Here
'blk' is inclusive, the modulo math works on its own.

Signed-off-by: Zach Brown <zab@versity.com>

2016-11-17 15:43:23 -08:00

utils

Fix mkfs buddy initialization

2016-11-17 15:43:23 -08:00

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