drbd: use RB_DECLARE_CALLBACKS() to define augment callbacks
The original code are the same as RB_DECLARE_CALLBACKS(). CC: Michel Lespinasse <walken@google.com> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Andreas Gruenbacher <agruen@linbit.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -37,40 +37,8 @@ compute_subtree_last(struct drbd_interval *node)
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return max;
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}
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static void augment_propagate(struct rb_node *rb, struct rb_node *stop)
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{
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while (rb != stop) {
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struct drbd_interval *node = rb_entry(rb, struct drbd_interval, rb);
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sector_t subtree_last = compute_subtree_last(node);
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if (node->end == subtree_last)
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break;
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node->end = subtree_last;
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rb = rb_parent(&node->rb);
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}
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}
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static void augment_copy(struct rb_node *rb_old, struct rb_node *rb_new)
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{
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struct drbd_interval *old = rb_entry(rb_old, struct drbd_interval, rb);
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struct drbd_interval *new = rb_entry(rb_new, struct drbd_interval, rb);
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new->end = old->end;
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}
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static void augment_rotate(struct rb_node *rb_old, struct rb_node *rb_new)
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{
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struct drbd_interval *old = rb_entry(rb_old, struct drbd_interval, rb);
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struct drbd_interval *new = rb_entry(rb_new, struct drbd_interval, rb);
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new->end = old->end;
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old->end = compute_subtree_last(old);
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}
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static const struct rb_augment_callbacks augment_callbacks = {
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augment_propagate,
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augment_copy,
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augment_rotate,
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};
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RB_DECLARE_CALLBACKS(static, augment_callbacks, struct drbd_interval, rb,
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sector_t, end, compute_subtree_last);
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/**
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* drbd_insert_interval - insert a new interval into a tree
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