rhashtable_try_insert

Name:rhashtable_try_insert

Proto:static void *rhashtable_try_insert(struct rhashtable *ht, const void *key, struct rhash_head *obj)

Type:void

Parameter:

Type	Parameter	Name
struct rhashtable *	ht
const void *	key
struct rhash_head *	obj

589

new_tbl = fetch RCU-protected pointer for dereferencing(tbl)

591

Do

592

593

hash = rht_head_hashfn(ht, tbl, obj, p)

594

If cu_access_pointer() - fetch RCU pointer with no dereferencing*@p: The pointer to read* Return the value of the specified RCU-protected pointer, but omit the* lockdep checks for being in an RCU read-side critical section(future_tbl) Then bkt = rht_bucket_var(tbl, hash)

597

Else bkt = rht_bucket_insert(ht, tbl, hash)

599

If (bkt == NULL) Then

600

new_tbl = rht_dereference_rcu(future_tbl, ht)

601

data = ERR_PTR( - EAGAIN)

602

Else

603

We lock a bucket by setting BIT(0) in the pointer - this is always* zero in real pointers. The NULLS mark is never stored in the bucket,* rather we store NULL if the bucket is empty.* bit_spin_locks do not handle contention well, but the whole point

604

data = rhashtable_lookup_one(ht, bkt, tbl, hash, key, obj)

606

new_tbl = rhashtable_insert_one(ht, bkt, tbl, hash, obj, data)

608

If PTR_ERR(new_tbl) != -EEXIST Then data = ERR_CAST - Explicitly cast an error-valued pointer to another pointer type*@ptr: The pointer to cast.* Explicitly cast an error-valued pointer to another pointer type in such a* way as to make it clear that's what's going on.

611

rht_unlock(tbl, bkt)

613

When Not IS_ERR_OR_NULL(new_tbl) cycle

615

If PTR_ERR(data) == -EAGAIN Then data = ERR_PTR(rhashtable_insert_rehash(ht, tbl) ? : - EAGAIN)

619

Return data

**Caller**
Name	Describe
rhashtable_insert_slow

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