[PATCH v4 12/13] iov_iter, net: Move hash_and_copy_to_iter() to net/

[David Howells <dhowells@xxxxxxxxxx>]

Move hash_and_copy_to_iter() to be with its only caller in networking code.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
cc: Jens Axboe <axboe@xxxxxxxxx>
cc: Christoph Hellwig <hch@xxxxxx>
cc: Christian Brauner <christian@xxxxxxxxxx>
cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
cc: David Laight <David.Laight@xxxxxxxxxx>
cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
cc: Eric Dumazet <edumazet@xxxxxxxxxx>
cc: Jakub Kicinski <kuba@xxxxxxxxxx>
cc: Paolo Abeni <pabeni@xxxxxxxxxx>
cc: linux-block@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
cc: linux-mm@xxxxxxxxx
cc: netdev@xxxxxxxxxxxxxxx
---
 include/linux/uio.h |  3 ---
 lib/iov_iter.c      | 20 --------------------
 net/core/datagram.c | 19 +++++++++++++++++++
 3 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index c335b95626af..6bb00645fe46 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -326,9 +326,6 @@ iov_iter_npages_cap(struct iov_iter *i, int maxpages, size_t max_bytes)
 	return npages;
 }
 
-size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
-		struct iov_iter *i);
-
 struct iovec *iovec_from_user(const struct iovec __user *uvector,
 		unsigned long nr_segs, unsigned long fast_segs,
 		struct iovec *fast_iov, bool compat);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 5b2d053f057f..77520834ebe4 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0-only
-#include <crypto/hash.h>
 #include <linux/export.h>
 #include <linux/bvec.h>
 #include <linux/fault-inject-usercopy.h>
@@ -1071,25 +1070,6 @@ ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
 }
 EXPORT_SYMBOL(iov_iter_get_pages_alloc2);
 
-size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
-		struct iov_iter *i)
-{
-#ifdef CONFIG_CRYPTO_HASH
-	struct ahash_request *hash = hashp;
-	struct scatterlist sg;
-	size_t copied;
-
-	copied = copy_to_iter(addr, bytes, i);
-	sg_init_one(&sg, addr, copied);
-	ahash_request_set_crypt(hash, &sg, NULL, copied);
-	crypto_ahash_update(hash);
-	return copied;
-#else
-	return 0;
-#endif
-}
-EXPORT_SYMBOL(hash_and_copy_to_iter);
-
 static int iov_npages(const struct iov_iter *i, int maxpages)
 {
 	size_t skip = i->iov_offset, size = i->count;
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 722311eeee18..103d46fa0eeb 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -61,6 +61,7 @@
 #include <net/tcp_states.h>
 #include <trace/events/skb.h>
 #include <net/busy_poll.h>
+#include <crypto/hash.h>
 
 /*
  *	Is a socket 'connection oriented' ?
@@ -489,6 +490,24 @@ static int __skb_datagram_iter(const struct sk_buff *skb, int offset,
 	return 0;
 }
 
+static size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
+				    struct iov_iter *i)
+{
+#ifdef CONFIG_CRYPTO_HASH
+	struct ahash_request *hash = hashp;
+	struct scatterlist sg;
+	size_t copied;
+
+	copied = copy_to_iter(addr, bytes, i);
+	sg_init_one(&sg, addr, copied);
+	ahash_request_set_crypt(hash, &sg, NULL, copied);
+	crypto_ahash_update(hash);
+	return copied;
+#else
+	return 0;
+#endif
+}
+
 /**
  *	skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator
  *          and update a hash.