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authorChris Mason <chris.mason@oracle.com>2011-03-23 21:54:42 +0300
committerroot <Chris Mason chris.mason@oracle.com>2011-03-28 13:37:22 +0400
commit240f62c8756df285da11469259b3900f32883168 (patch)
treeeb973ef95389a9511c137c7c26248dfd04a2495f /fs/btrfs/ctree.h
parentc0da7aa1a2d8fcafe271a7077599253c8ed94bb2 (diff)
downloadlinux-240f62c8756df285da11469259b3900f32883168.tar.xz
Btrfs: use RCU instead of a spinlock to protect the root node
The pointer to the extent buffer for the root of each tree is protected by a spinlock so that we can safely read the pointer and take a reference on the extent buffer. But now that the extent buffers are freed via RCU, we can safely use rcu_read_lock instead. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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