audit: Provide helper for dropping mark's chunk reference
Provide a helper function audit_mark_put_chunk() for dropping mark's reference (which has to happen only after RCU grace period expires). Currently that happens only from a single place but in later patches we introduce more callers. Reviewed-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Paul Moore <paul@paul-moore.com>
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@ -132,10 +132,20 @@ static void __put_chunk(struct rcu_head *rcu)
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audit_put_chunk(chunk);
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}
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/*
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* Drop reference to the chunk that was held by the mark. This is the reference
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* that gets dropped after we've removed the chunk from the hash table and we
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* use it to make sure chunk cannot be freed before RCU grace period expires.
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*/
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static void audit_mark_put_chunk(struct audit_chunk *chunk)
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{
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call_rcu(&chunk->head, __put_chunk);
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}
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static void audit_tree_destroy_watch(struct fsnotify_mark *entry)
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{
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struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);
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call_rcu(&chunk->head, __put_chunk);
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audit_mark_put_chunk(chunk);
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}
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static struct audit_chunk *alloc_chunk(int count)
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