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authorJens Axboe <axboe@suse.de>2006-06-21 03:36:18 -0400
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-06-23 11:10:39 -0400
commitdd67d051529387f6e44d22d1d5540ef281965fdd (patch)
tree80457f9a2ad3e562b179e40f5c8d51b4f24d6d9e /block/deadline-iosched.c
parent9e94cd4fd1812bab45237f998b3c6fa1b24023fd (diff)
[PATCH] rbtree: support functions used by the io schedulers
They all duplicate macros to check for empty root and/or node, and clearing a node. So put those in rbtree.h. Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/deadline-iosched.c')
-rw-r--r--block/deadline-iosched.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index e5bccaaed563..4469dd84623c 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -159,9 +159,6 @@ deadline_find_drq_hash(struct deadline_data *dd, sector_t offset)
159/* 159/*
160 * rb tree support functions 160 * rb tree support functions
161 */ 161 */
162#define RB_EMPTY(root) ((root)->rb_node == NULL)
163#define ON_RB(node) (rb_parent(node) != node)
164#define RB_CLEAR(node) (rb_set_parent(node, node))
165#define rb_entry_drq(node) rb_entry((node), struct deadline_rq, rb_node) 162#define rb_entry_drq(node) rb_entry((node), struct deadline_rq, rb_node)
166#define DRQ_RB_ROOT(dd, drq) (&(dd)->sort_list[rq_data_dir((drq)->request)]) 163#define DRQ_RB_ROOT(dd, drq) (&(dd)->sort_list[rq_data_dir((drq)->request)])
167#define rq_rb_key(rq) (rq)->sector 164#define rq_rb_key(rq) (rq)->sector
@@ -220,9 +217,9 @@ deadline_del_drq_rb(struct deadline_data *dd, struct deadline_rq *drq)
220 dd->next_drq[data_dir] = rb_entry_drq(rbnext); 217 dd->next_drq[data_dir] = rb_entry_drq(rbnext);
221 } 218 }
222 219
223 BUG_ON(!ON_RB(&drq->rb_node)); 220 BUG_ON(!RB_EMPTY_NODE(&drq->rb_node));
224 rb_erase(&drq->rb_node, DRQ_RB_ROOT(dd, drq)); 221 rb_erase(&drq->rb_node, DRQ_RB_ROOT(dd, drq));
225 RB_CLEAR(&drq->rb_node); 222 RB_CLEAR_NODE(&drq->rb_node);
226} 223}
227 224
228static struct request * 225static struct request *
@@ -496,7 +493,7 @@ static int deadline_dispatch_requests(request_queue_t *q, int force)
496 */ 493 */
497 494
498 if (reads) { 495 if (reads) {
499 BUG_ON(RB_EMPTY(&dd->sort_list[READ])); 496 BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[READ]));
500 497
501 if (writes && (dd->starved++ >= dd->writes_starved)) 498 if (writes && (dd->starved++ >= dd->writes_starved))
502 goto dispatch_writes; 499 goto dispatch_writes;
@@ -512,7 +509,7 @@ static int deadline_dispatch_requests(request_queue_t *q, int force)
512 509
513 if (writes) { 510 if (writes) {
514dispatch_writes: 511dispatch_writes:
515 BUG_ON(RB_EMPTY(&dd->sort_list[WRITE])); 512 BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[WRITE]));
516 513
517 dd->starved = 0; 514 dd->starved = 0;
518 515
@@ -668,7 +665,7 @@ deadline_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
668 drq = mempool_alloc(dd->drq_pool, gfp_mask); 665 drq = mempool_alloc(dd->drq_pool, gfp_mask);
669 if (drq) { 666 if (drq) {
670 memset(drq, 0, sizeof(*drq)); 667 memset(drq, 0, sizeof(*drq));
671 RB_CLEAR(&drq->rb_node); 668 RB_CLEAR_NODE(&drq->rb_node);
672 drq->request = rq; 669 drq->request = rq;
673 670
674 INIT_HLIST_NODE(&drq->hash); 671 INIT_HLIST_NODE(&drq->hash);