[CRYPTO] api: Added spawns

Spawns lock a specific crypto algorithm in place.  They can then be used
with crypto_spawn_tfm to allocate a tfm for that algorithm.  When the base
algorithm of a spawn is deregistered, all its spawns will be automatically
removed.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 85f73c38191..40a6330abc8 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -35,6 +35,8 @@
 #define CRYPTO_ALG_TYPE_COMPRESS        0x00000004
 
 #define CRYPTO_ALG_LARVAL               0x00000010
+#define CRYPTO_ALG_DEAD                 0x00000020
+#define CRYPTO_ALG_DYING                0x00000040
 
 /*
  * Transform masks and values (for crt_flags).
@@ -145,6 +147,8 @@ struct compress_alg {
 
 struct crypto_alg {
         struct list_head cra_list;
+        struct list_head cra_users;
+
         u32 cra_flags;
         unsigned int cra_blocksize;
         unsigned int cra_ctxsize;