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block: don't check for required features in elevator_match 

Checking for the required features in the callers simplifies the code
quite a bit, so do that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221030100714.876891-7-hch@lst.de
[axboe: adjust for dropping patch 1, use __elevator_find()]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-10-30 11:07:13 +01:00 committed by Jens Axboe
parent 2eef17a209
commit ffb86425ee
1 changed files with 16 additions and 35 deletions
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51
block/elevator.c
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@ -83,10 +83,11 @@ bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
}
EXPORT_SYMBOL(elv_bio_merge_ok);
static inline bool elv_support_features(unsigned int elv_features,
unsigned int required_features)
static inline bool elv_support_features(struct request_queue *q,
const struct elevator_type *e)
{
return (required_features & elv_features) == required_features;
return (q->required_elevator_features & e->elevator_features) ==
q->required_elevator_features;
}
/**
@ -98,37 +99,19 @@ static inline bool elv_support_features(unsigned int elv_features,
* Return true if the elevator @e name matches @name and if @e provides all
* the features specified by @required_features.
*/
static bool elevator_match(const struct elevator_type *e, const char *name,
unsigned int required_features)
static bool elevator_match(const struct elevator_type *e, const char *name)
{
if (!elv_support_features(e->elevator_features, required_features))
return false;
if (!strcmp(e->elevator_name, name))
return true;
if (e->elevator_alias && !strcmp(e->elevator_alias, name))
return true;
return false;
return !strcmp(e->elevator_name, name) ||
(e->elevator_alias && !strcmp(e->elevator_alias, name));
}
/**
* elevator_find - Find an elevator
* @name: Name of the elevator to find
* @required_features: Features that the elevator must provide
*
* Return the first registered scheduler with name @name and supporting the
* features @required_features and NULL otherwise.
*/
static struct elevator_type *elevator_find(const char *name,
unsigned int required_features)
static struct elevator_type *__elevator_find(const char *name)
{
struct elevator_type *e;
list_for_each_entry(e, &elv_list, list) {
if (elevator_match(e, name, required_features))
list_for_each_entry(e, &elv_list, list)
if (elevator_match(e, name))
return e;
}
return NULL;
}
@ -138,8 +121,8 @@ static struct elevator_type *elevator_find_get(struct request_queue *q,
struct elevator_type *e;
spin_lock(&elv_list_lock);
e = elevator_find(name, q->required_elevator_features);
if (e && !elevator_tryget(e))
e = __elevator_find(name);
if (e && (!elv_support_features(q, e) || !elevator_tryget(e)))
e = NULL;
spin_unlock(&elv_list_lock);
return e;
@ -538,7 +521,7 @@ int elv_register(struct elevator_type *e)
/* register, don't allow duplicate names */
spin_lock(&elv_list_lock);
if (elevator_find(e->elevator_name, 0)) {
if (__elevator_find(e->elevator_name)) {
spin_unlock(&elv_list_lock);
kmem_cache_destroy(e->icq_cache);
return -EBUSY;
@ -639,8 +622,7 @@ static struct elevator_type *elevator_get_by_features(struct request_queue *q)
spin_lock(&elv_list_lock);
list_for_each_entry(e, &elv_list, list) {
if (elv_support_features(e->elevator_features,
q->required_elevator_features)) {
if (elv_support_features(q, e)) {
found = e;
break;
}
@ -745,7 +727,7 @@ static int elevator_change(struct request_queue *q, const char *elevator_name)
return elevator_switch(q, NULL);
}
if (q->elevator && elevator_match(q->elevator->type, elevator_name, 0))
if (q->elevator && elevator_match(q->elevator->type, elevator_name))
return 0;
e = elevator_find_get(q, elevator_name);
@ -796,8 +778,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
len += sprintf(name+len, "[%s] ", cur->elevator_name);
continue;
}
if (elevator_match(e, e->elevator_name,
q->required_elevator_features))
if (elv_support_features(q, e))
len += sprintf(name+len, "%s ", e->elevator_name);
}
spin_unlock(&elv_list_lock);