From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 15 Nov 2010 07:25:45 +0000 (+1030)
Subject: tdb2: fix coalesce race #3
X-Git-Url: https://git.ozlabs.org/?a=commitdiff_plain;ds=sidebyside;h=06a5b1a852c207a5172922e39d8effab0dd17b91;hp=06a5b1a852c207a5172922e39d8effab0dd17b91;p=ccan

tdb2: fix coalesce race #3

When we're coalescing, we need to drop the lock on the current free list, as
we've enlarged the block and it may now belong in a different list.

Unfortunately (as shown by repeated tdbtorture -n 8) another coalescing run
can do the coalescing while we've dropped the lock.  So for this case, we
use the TDB_COALESCING_MAGIC flag so it doesn't look free.
---