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authorAlexei Starovoitov <ast@kernel.org>2019-02-01 02:40:09 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2019-02-01 22:55:39 +0300
commit96049f3afd50fe8db69fa0068cdca822e747b1e4 (patch)
treeb082ac077ea0bb78a073a25e540be72034ce0451 /include/linux/bpf.h
parentab963beb9f5db303b4fd7e34e422b96270e5b972 (diff)
downloadlinux-96049f3afd50fe8db69fa0068cdca822e747b1e4.tar.xz
bpf: introduce BPF_F_LOCK flag
Introduce BPF_F_LOCK flag for map_lookup and map_update syscall commands and for map_update() helper function. In all these cases take a lock of existing element (which was provided in BTF description) before copying (in or out) the rest of map value. Implementation details that are part of uapi: Array: The array map takes the element lock for lookup/update. Hash: hash map also takes the lock for lookup/update and tries to avoid the bucket lock. If old element exists it takes the element lock and updates the element in place. If element doesn't exist it allocates new one and inserts into hash table while holding the bucket lock. In rare case the hashmap has to take both the bucket lock and the element lock to update old value in place. Cgroup local storage: It is similar to array. update in place and lookup are done with lock taken. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux/bpf.h')
-rw-r--r--include/linux/bpf.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 2ae615b48bb8..bd169a7bcc93 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -119,6 +119,8 @@ static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
memcpy(dst, src, map->value_size);
}
}
+void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
+ bool lock_src);
struct bpf_offload_dev;
struct bpf_offloaded_map;