Function report |
Source Code:kernel\bpf\hashtab.c |
Create Date:2022-07-28 13:10:03 |
Last Modify:2022-05-23 09:15:29 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:htab_lru_map_update_elem
Proto:static int htab_lru_map_update_elem(struct bpf_map *map, void *key, void *value, u64 map_flags)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
struct bpf_map * | map | |
void * | key | |
void * | value | |
u64 | map_flags |
922 | If Value for the false possibility is greater at compile time(map_flags > update existing element ) Then Return -EINVAL |
926 | WARN_ON_ONCE(!_read_lock_held() - might we be in RCU read-side critical section?* If CONFIG_DEBUG_LOCK_ALLOC is selected, returns nonzero iff in an RCU* read-side critical section) |
930 | hash = htab_map_hash(key, key_size, hashrnd) |
932 | b = __select_bucket(htab, hash) |
940 | l_new = prealloc_lru_pop(htab, key, hash) |
946 | raw_spin_lock_irqsave( & lock, flags) |
950 | ret = check_flags(htab, l_old, map_flags) |
958 | If l_old Then |
959 | bpf_lru_node_set_ref( & lru_node) |
962 | ret = 0 |
964 | err : |
965 | raw_spin_unlock_irqrestore( & lock, flags) |
967 | If ret Then bpf_lru_push_free( & lru, & lru_node) |
969 | Else if l_old Then bpf_lru_push_free( & lru, & lru_node) |
972 | Return ret |
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