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[RBTREE] Change rbtree off-tree marking in I/O schedulers.

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They were abusing the rb_color field to mark nodes which weren't currently
on the tree. Fix that to use the same method as eventpoll did -- setting
the parent pointer to point back to itself. And use the appropriate
accessor macros for setting and reading the parent.

Signed-off-by: David Woodhouse <[email protected]>
This commit is contained in:
David Woodhouse 2006-04-21 13:15:17 +01:00
commit 3db3a44530
3 changed files with 5 additions and 13 deletions
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5
block/deadline-iosched.c
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@ -165,10 +165,9 @@ deadline_find_drq_hash(struct deadline_data *dd, sector_t offset)
/*
* rb tree support functions
*/
#define RB_NONE (2)
#define RB_EMPTY(root) ((root)->rb_node == NULL)
#define ON_RB(node) ((node)->rb_color != RB_NONE)
#define RB_CLEAR(node) ((node)->rb_color = RB_NONE)
#define ON_RB(node) (rb_parent(node) != node)
#define RB_CLEAR(node) (rb_set_parent(node, node))
#define rb_entry_drq(node) rb_entry((node), struct deadline_rq, rb_node)
#define DRQ_RB_ROOT(dd, drq) (&(dd)->sort_list[rq_data_dir((drq)->request)])
#define rq_rb_key(rq) (rq)->sector