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-rw-r--r--block/as-iosched.c78
1 files changed, 33 insertions, 45 deletions
diff --git a/block/as-iosched.c b/block/as-iosched.c
index e25a5d79ab2..1ec5df46670 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -96,7 +96,7 @@ struct as_data {
struct as_rq *next_arq[2]; /* next in sort order */
sector_t last_sector[2]; /* last REQ_SYNC & REQ_ASYNC sectors */
- struct list_head *hash; /* request hash */
+ struct hlist_head *hash; /* request hash */
unsigned long exit_prob; /* probability a task will exit while
being waited on */
@@ -165,8 +165,7 @@ struct as_rq {
/*
* request hash, key is the ending offset (for back merge lookup)
*/
- struct list_head hash;
- unsigned int on_hash;
+ struct hlist_node hash;
/*
* expire fifo
@@ -282,17 +281,15 @@ static const int as_hash_shift = 6;
#define AS_HASH_FN(sec) (hash_long(AS_HASH_BLOCK((sec)), as_hash_shift))
#define AS_HASH_ENTRIES (1 << as_hash_shift)
#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
-#define list_entry_hash(ptr) list_entry((ptr), struct as_rq, hash)
static inline void __as_del_arq_hash(struct as_rq *arq)
{
- arq->on_hash = 0;
- list_del_init(&arq->hash);
+ hlist_del_init(&arq->hash);
}
static inline void as_del_arq_hash(struct as_rq *arq)
{
- if (arq->on_hash)
+ if (!hlist_unhashed(&arq->hash))
__as_del_arq_hash(arq);
}
@@ -300,10 +297,9 @@ static void as_add_arq_hash(struct as_data *ad, struct as_rq *arq)
{
struct request *rq = arq->request;
- BUG_ON(arq->on_hash);
+ BUG_ON(!hlist_unhashed(&arq->hash));
- arq->on_hash = 1;
- list_add(&arq->hash, &ad->hash[AS_HASH_FN(rq_hash_key(rq))]);
+ hlist_add_head(&arq->hash, &ad->hash[AS_HASH_FN(rq_hash_key(rq))]);
}
/*
@@ -312,31 +308,29 @@ static void as_add_arq_hash(struct as_data *ad, struct as_rq *arq)
static inline void as_hot_arq_hash(struct as_data *ad, struct as_rq *arq)
{
struct request *rq = arq->request;
- struct list_head *head = &ad->hash[AS_HASH_FN(rq_hash_key(rq))];
+ struct hlist_head *head = &ad->hash[AS_HASH_FN(rq_hash_key(rq))];
- if (!arq->on_hash) {
+ if (hlist_unhashed(&arq->hash)) {
WARN_ON(1);
return;
}
- if (arq->hash.prev != head) {
- list_del(&arq->hash);
- list_add(&arq->hash, head);
+ if (&arq->hash != head->first) {
+ hlist_del(&arq->hash);
+ hlist_add_head(&arq->hash, head);
}
}
static struct request *as_find_arq_hash(struct as_data *ad, sector_t offset)
{
- struct list_head *hash_list = &ad->hash[AS_HASH_FN(offset)];
- struct list_head *entry, *next = hash_list->next;
+ struct hlist_head *hash_list = &ad->hash[AS_HASH_FN(offset)];
+ struct hlist_node *entry, *next;
+ struct as_rq *arq;
- while ((entry = next) != hash_list) {
- struct as_rq *arq = list_entry_hash(entry);
+ hlist_for_each_entry_safe(arq, entry, next, hash_list, hash) {
struct request *__rq = arq->request;
- next = entry->next;
-
- BUG_ON(!arq->on_hash);
+ BUG_ON(hlist_unhashed(&arq->hash));
if (!rq_mergeable(__rq)) {
as_del_arq_hash(arq);
@@ -353,10 +347,6 @@ static struct request *as_find_arq_hash(struct as_data *ad, 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 rb_entry_arq(node) rb_entry((node), struct as_rq, rb_node)
#define ARQ_RB_ROOT(ad, arq) (&(ad)->sort_list[(arq)->is_sync])
#define rq_rb_key(rq) (rq)->sector
@@ -425,13 +415,13 @@ static void as_add_arq_rb(struct as_data *ad, struct as_rq *arq)
static inline void as_del_arq_rb(struct as_data *ad, struct as_rq *arq)
{
- if (!ON_RB(&arq->rb_node)) {
+ if (!RB_EMPTY_NODE(&arq->rb_node)) {
WARN_ON(1);
return;
}
rb_erase(&arq->rb_node, ARQ_RB_ROOT(ad, arq));
- RB_CLEAR(&arq->rb_node);
+ RB_CLEAR_NODE(&arq->rb_node);
}
static struct request *
@@ -552,7 +542,7 @@ static struct as_rq *as_find_next_arq(struct as_data *ad, struct as_rq *last)
struct rb_node *rbprev = rb_prev(&last->rb_node);
struct as_rq *arq_next, *arq_prev;
- BUG_ON(!ON_RB(&last->rb_node));
+ BUG_ON(!RB_EMPTY_NODE(&last->rb_node));
if (rbprev)
arq_prev = rb_entry_arq(rbprev);
@@ -1129,7 +1119,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct as_rq *arq)
struct request *rq = arq->request;
const int data_dir = arq->is_sync;
- BUG_ON(!ON_RB(&arq->rb_node));
+ BUG_ON(!RB_EMPTY_NODE(&arq->rb_node));
as_antic_stop(ad);
ad->antic_status = ANTIC_OFF;
@@ -1254,7 +1244,7 @@ static int as_dispatch_request(request_queue_t *q, int force)
*/
if (reads) {
- BUG_ON(RB_EMPTY(&ad->sort_list[REQ_SYNC]));
+ BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_SYNC]));
if (writes && ad->batch_data_dir == REQ_SYNC)
/*
@@ -1278,7 +1268,7 @@ static int as_dispatch_request(request_queue_t *q, int force)
if (writes) {
dispatch_writes:
- BUG_ON(RB_EMPTY(&ad->sort_list[REQ_ASYNC]));
+ BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_ASYNC]));
if (ad->batch_data_dir == REQ_SYNC) {
ad->changed_batch = 1;
@@ -1346,7 +1336,7 @@ static void as_add_request(request_queue_t *q, struct request *rq)
arq->state = AS_RQ_NEW;
if (rq_data_dir(arq->request) == READ
- || current->flags&PF_SYNCWRITE)
+ || (arq->request->flags & REQ_RW_SYNC))
arq->is_sync = 1;
else
arq->is_sync = 0;
@@ -1598,12 +1588,11 @@ static int as_set_request(request_queue_t *q, struct request *rq,
if (arq) {
memset(arq, 0, sizeof(*arq));
- RB_CLEAR(&arq->rb_node);
+ RB_CLEAR_NODE(&arq->rb_node);
arq->request = rq;
arq->state = AS_RQ_PRESCHED;
arq->io_context = NULL;
- INIT_LIST_HEAD(&arq->hash);
- arq->on_hash = 0;
+ INIT_HLIST_NODE(&arq->hash);
INIT_LIST_HEAD(&arq->fifo);
rq->elevator_private = arq;
return 0;
@@ -1648,26 +1637,26 @@ static void as_exit_queue(elevator_t *e)
* initialize elevator private data (as_data), and alloc a arq for
* each request on the free lists
*/
-static int as_init_queue(request_queue_t *q, elevator_t *e)
+static void *as_init_queue(request_queue_t *q, elevator_t *e)
{
struct as_data *ad;
int i;
if (!arq_pool)
- return -ENOMEM;
+ return NULL;
ad = kmalloc_node(sizeof(*ad), GFP_KERNEL, q->node);
if (!ad)
- return -ENOMEM;
+ return NULL;
memset(ad, 0, sizeof(*ad));
ad->q = q; /* Identify what queue the data belongs to */
- ad->hash = kmalloc_node(sizeof(struct list_head)*AS_HASH_ENTRIES,
+ ad->hash = kmalloc_node(sizeof(struct hlist_head)*AS_HASH_ENTRIES,
GFP_KERNEL, q->node);
if (!ad->hash) {
kfree(ad);
- return -ENOMEM;
+ return NULL;
}
ad->arq_pool = mempool_create_node(BLKDEV_MIN_RQ, mempool_alloc_slab,
@@ -1675,7 +1664,7 @@ static int as_init_queue(request_queue_t *q, elevator_t *e)
if (!ad->arq_pool) {
kfree(ad->hash);
kfree(ad);
- return -ENOMEM;
+ return NULL;
}
/* anticipatory scheduling helpers */
@@ -1685,7 +1674,7 @@ static int as_init_queue(request_queue_t *q, elevator_t *e)
INIT_WORK(&ad->antic_work, as_work_handler, q);
for (i = 0; i < AS_HASH_ENTRIES; i++)
- INIT_LIST_HEAD(&ad->hash[i]);
+ INIT_HLIST_HEAD(&ad->hash[i]);
INIT_LIST_HEAD(&ad->fifo_list[REQ_SYNC]);
INIT_LIST_HEAD(&ad->fifo_list[REQ_ASYNC]);
@@ -1696,14 +1685,13 @@ static int as_init_queue(request_queue_t *q, elevator_t *e)
ad->antic_expire = default_antic_expire;
ad->batch_expire[REQ_SYNC] = default_read_batch_expire;
ad->batch_expire[REQ_ASYNC] = default_write_batch_expire;
- e->elevator_data = ad;
ad->current_batch_expires = jiffies + ad->batch_expire[REQ_SYNC];
ad->write_batch_count = ad->batch_expire[REQ_ASYNC] / 10;
if (ad->write_batch_count < 2)
ad->write_batch_count = 2;
- return 0;
+ return ad;
}
/*
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-14 00:17:02 +0000