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Commit a8375713 authored by Jan Kara's avatar Jan Kara Committed by Paul Moore
Browse files

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: default avatarRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent 8cd0feb5

kernel/audit_tree.c

+11 −1
Original line number Diff line number Diff line
@@ -132,10 +132,20 @@ static void __put_chunk(struct rcu_head *rcu) 
	audit_put_chunk(chunk);

}



/*

 * Drop reference to the chunk that was held by the mark. This is the reference

 * that gets dropped after we've removed the chunk from the hash table and we

 * use it to make sure chunk cannot be freed before RCU grace period expires.

 */

static void audit_mark_put_chunk(struct audit_chunk *chunk)

{

	call_rcu(&chunk->head, __put_chunk);

}



static void audit_tree_destroy_watch(struct fsnotify_mark *entry)

{

	struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);

	call_rcu(&chunk->head, __put_chunk);

	audit_mark_put_chunk(chunk);

}



static struct audit_chunk *alloc_chunk(int count)