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authorMartin KaFai Lau <martin.lau@kernel.org>2023-03-08 09:59:24 +0300
committerAlexei Starovoitov <ast@kernel.org>2023-03-10 22:05:28 +0300
commitfc6652aab6ad545de70b772550da9043d0b47f1c (patch)
treeefcb165b250a068e3de214b80d70fbea64dab58d /include/linux/bpf_local_storage.h
parent121f31f3e00dfc1acbca43f6f35779e050b56cfc (diff)
downloadlinux-fc6652aab6ad545de70b772550da9043d0b47f1c.tar.xz
bpf: Remember smap in bpf_local_storage
This patch remembers which smap triggers the allocation of a 'struct bpf_local_storage' object. The local_storage is allocated during the very first selem added to the owner. The smap pointer is needed when using the bpf_mem_cache_free in a later patch because it needs to free to the correct smap's bpf_mem_alloc object. When a selem is being removed, it needs to check if it is the selem that triggers the creation of the local_storage. If it is, the local_storage->smap pointer will be reset to NULL. This NULL reset is done under the local_storage->lock in bpf_selem_unlink_storage_nolock() when a selem is being removed. Also note that the local_storage may not go away even local_storage->smap is NULL because there may be other selem still stored in the local_storage. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20230308065936.1550103-6-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf_local_storage.h')
-rw-r--r--include/linux/bpf_local_storage.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bpf_local_storage.h b/include/linux/bpf_local_storage.h
index 5908a954ddc2..613b1805ed9f 100644
--- a/include/linux/bpf_local_storage.h
+++ b/include/linux/bpf_local_storage.h
@@ -83,6 +83,7 @@ struct bpf_local_storage_elem {
struct bpf_local_storage {
struct bpf_local_storage_data __rcu *cache[BPF_LOCAL_STORAGE_CACHE_SIZE];
+ struct bpf_local_storage_map __rcu *smap;
struct hlist_head list; /* List of bpf_local_storage_elem */
void *owner; /* The object that owns the above "list" of
* bpf_local_storage_elem.