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rhashtable: Add rhashtable_lookup_get_insert_fast 

Add rhashtable_lookup_get_insert_fast for fixed keys, similar to
rhashtable_lookup_get_insert_key for explicit keys.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Gruenbacher 2017-03-18 00:36:15 +01:00 committed by David S. Miller
parent 9549c6c872
commit f9fe1c12d1
1 changed files with 22 additions and 0 deletions
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22
include/linux/rhashtable.h
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@ -915,6 +915,28 @@ static inline int rhashtable_lookup_insert_fast(
return ret == NULL ? 0 : -EEXIST;
}
/**
* rhashtable_lookup_get_insert_fast - lookup and insert object into hash table
* @ht: hash table
* @obj: pointer to hash head inside object
* @params: hash table parameters
*
* Just like rhashtable_lookup_insert_fast(), but this function returns the
* object if it exists, NULL if it did not and the insertion was successful,
* and an ERR_PTR otherwise.
*/
static inline void *rhashtable_lookup_get_insert_fast(
struct rhashtable *ht, struct rhash_head *obj,
const struct rhashtable_params params)
{
const char *key = rht_obj(ht, obj);
BUG_ON(ht->p.obj_hashfn);
return __rhashtable_insert_fast(ht, key + ht->p.key_offset, obj, params,
false);
}
/**
* rhashtable_lookup_insert_key - search and insert object to hash table
* with explicit key