smb: smbdirect: introduce smbdirect_get_buf_page_count()

This is a copy of get_buf_page_count() in the server
and will replace it soon.

The only difference is that we now use size_t instead
of int.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/common/smbdirect/smbdirect_socket.h b/fs/smb/common/smbdirect/smbdirect_socket.h
index 874d4d1a56a0f148ef61d7bc760d68f22537975f..b2882935a5d86bef7579ed5ac09033c3dc7d6117 100644 (file)
--- a/fs/smb/common/smbdirect/smbdirect_socket.h
+++ b/fs/smb/common/smbdirect/smbdirect_socket.h
@@ -734,4 +734,10 @@ struct smbdirect_rw_io {
        struct scatterlist sg_list[];
 };
 
+static inline size_t smbdirect_get_buf_page_count(const void *buf, size_t size)
+{
+       return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) -
+               (uintptr_t)buf / PAGE_SIZE;
+}
+
 #endif /* __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_SOCKET_H__ */