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-rw-r--r--block/deadline-iosched.c52
1 files changed, 21 insertions, 31 deletions
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index c94de8e12fbf..4469dd84623c 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -30,8 +30,7 @@ static const int deadline_hash_shift = 5;
#define DL_HASH_FN(sec) (hash_long(DL_HASH_BLOCK((sec)), deadline_hash_shift))
#define DL_HASH_ENTRIES (1 << deadline_hash_shift)
#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
-#define list_entry_hash(ptr) list_entry((ptr), struct deadline_rq, hash)
-#define ON_HASH(drq) (drq)->on_hash
+#define ON_HASH(drq) (!hlist_unhashed(&(drq)->hash))
struct deadline_data {
/*
@@ -48,7 +47,7 @@ struct deadline_data {
* next in sort order. read, write or both are NULL
*/
struct deadline_rq *next_drq[2];
- struct list_head *hash; /* request hash */
+ struct hlist_head *hash; /* request hash */
unsigned int batching; /* number of sequential requests made */
sector_t last_sector; /* head position */
unsigned int starved; /* times reads have starved writes */
@@ -79,8 +78,7 @@ struct deadline_rq {
/*
* request hash, key is the ending offset (for back merge lookup)
*/
- struct list_head hash;
- char on_hash;
+ struct hlist_node hash;
/*
* expire fifo
@@ -100,8 +98,7 @@ static kmem_cache_t *drq_pool;
*/
static inline void __deadline_del_drq_hash(struct deadline_rq *drq)
{
- drq->on_hash = 0;
- list_del_init(&drq->hash);
+ hlist_del_init(&drq->hash);
}
static inline void deadline_del_drq_hash(struct deadline_rq *drq)
@@ -117,8 +114,7 @@ deadline_add_drq_hash(struct deadline_data *dd, struct deadline_rq *drq)
BUG_ON(ON_HASH(drq));
- drq->on_hash = 1;
- list_add(&drq->hash, &dd->hash[DL_HASH_FN(rq_hash_key(rq))]);
+ hlist_add_head(&drq->hash, &dd->hash[DL_HASH_FN(rq_hash_key(rq))]);
}
/*
@@ -128,26 +124,24 @@ static inline void
deadline_hot_drq_hash(struct deadline_data *dd, struct deadline_rq *drq)
{
struct request *rq = drq->request;
- struct list_head *head = &dd->hash[DL_HASH_FN(rq_hash_key(rq))];
+ struct hlist_head *head = &dd->hash[DL_HASH_FN(rq_hash_key(rq))];
- if (ON_HASH(drq) && drq->hash.prev != head) {
- list_del(&drq->hash);
- list_add(&drq->hash, head);
+ if (ON_HASH(drq) && &drq->hash != head->first) {
+ hlist_del(&drq->hash);
+ hlist_add_head(&drq->hash, head);
}
}
static struct request *
deadline_find_drq_hash(struct deadline_data *dd, sector_t offset)
{
- struct list_head *hash_list = &dd->hash[DL_HASH_FN(offset)];
- struct list_head *entry, *next = hash_list->next;
+ struct hlist_head *hash_list = &dd->hash[DL_HASH_FN(offset)];
+ struct hlist_node *entry, *next;
+ struct deadline_rq *drq;
- while ((entry = next) != hash_list) {
- struct deadline_rq *drq = list_entry_hash(entry);
+ hlist_for_each_entry_safe(drq, entry, next, hash_list, hash) {
struct request *__rq = drq->request;
- next = entry->next;
-
BUG_ON(!ON_HASH(drq));
if (!rq_mergeable(__rq)) {
@@ -165,9 +159,6 @@ deadline_find_drq_hash(struct deadline_data *dd, sector_t offset)
/*
* rb tree support functions
*/
-#define RB_EMPTY(root) ((root)->rb_node == NULL)
-#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
@@ -226,9 +217,9 @@ deadline_del_drq_rb(struct deadline_data *dd, struct deadline_rq *drq)
dd->next_drq[data_dir] = rb_entry_drq(rbnext);
}
- BUG_ON(!ON_RB(&drq->rb_node));
+ BUG_ON(!RB_EMPTY_NODE(&drq->rb_node));
rb_erase(&drq->rb_node, DRQ_RB_ROOT(dd, drq));
- RB_CLEAR(&drq->rb_node);
+ RB_CLEAR_NODE(&drq->rb_node);
}
static struct request *
@@ -502,7 +493,7 @@ static int deadline_dispatch_requests(request_queue_t *q, int force)
*/
if (reads) {
- BUG_ON(RB_EMPTY(&dd->sort_list[READ]));
+ BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[READ]));
if (writes && (dd->starved++ >= dd->writes_starved))
goto dispatch_writes;
@@ -518,7 +509,7 @@ static int deadline_dispatch_requests(request_queue_t *q, int force)
if (writes) {
dispatch_writes:
- BUG_ON(RB_EMPTY(&dd->sort_list[WRITE]));
+ BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[WRITE]));
dd->starved = 0;
@@ -625,7 +616,7 @@ static void *deadline_init_queue(request_queue_t *q, elevator_t *e)
return NULL;
memset(dd, 0, sizeof(*dd));
- dd->hash = kmalloc_node(sizeof(struct list_head)*DL_HASH_ENTRIES,
+ dd->hash = kmalloc_node(sizeof(struct hlist_head)*DL_HASH_ENTRIES,
GFP_KERNEL, q->node);
if (!dd->hash) {
kfree(dd);
@@ -641,7 +632,7 @@ static void *deadline_init_queue(request_queue_t *q, elevator_t *e)
}
for (i = 0; i < DL_HASH_ENTRIES; i++)
- INIT_LIST_HEAD(&dd->hash[i]);
+ INIT_HLIST_HEAD(&dd->hash[i]);
INIT_LIST_HEAD(&dd->fifo_list[READ]);
INIT_LIST_HEAD(&dd->fifo_list[WRITE]);
@@ -674,11 +665,10 @@ deadline_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
drq = mempool_alloc(dd->drq_pool, gfp_mask);
if (drq) {
memset(drq, 0, sizeof(*drq));
- RB_CLEAR(&drq->rb_node);
+ RB_CLEAR_NODE(&drq->rb_node);
drq->request = rq;
- INIT_LIST_HEAD(&drq->hash);
- drq->on_hash = 0;
+ INIT_HLIST_NODE(&drq->hash);
INIT_LIST_HEAD(&drq->fifo);