Introduce a new socket option SO_CRITICAL to mark a socket as critical.
This socket option takes a integer boolean flag that can be set using
setsockopt() and read with getsockopt().
-----------------------------------------------------------------------
include/asm-i386/socket.h | 2 ++
include/asm-powerpc/socket.h | 2 ++
net/core/sock.c | 13 ++++++++++++-
3 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/include/asm-i386/socket.h b/include/asm-i386/socket.h
index 802ae76..bd4ce8e 100644
--- a/include/asm-i386/socket.h
+++ b/include/asm-i386/socket.h
@@ -49,4 +49,6 @@
#define SO_PEERSEC 31
+#define SO_CRITICAL 100
+
#endif /* _ASM_SOCKET_H */
diff --git a/include/asm-powerpc/socket.h b/include/asm-powerpc/socket.h
index e4b8177..6cfb79a 100644
--- a/include/asm-powerpc/socket.h
+++ b/include/asm-powerpc/socket.h
@@ -56,4 +56,6 @@
#define SO_PEERSEC 31
+#define SO_CRITICAL 100
+
#endif /* _ASM_POWERPC_SOCKET_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index 13cc3be..d2d10cb 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -456,6 +456,13 @@ set_rcvbuf:
ret = -ENONET;
break;
+ case SO_CRITICAL:
+ if (valbool)
+ sk->sk_allocation |= __GFP_CRITICAL;
+ else
+ sk->sk_allocation &= ~__GFP_CRITICAL;
+ break;
+
/* We implement the SO_SNDLOWAT etc to
not be settable (1003.1g 5.3) */
default:
@@ -616,7 +623,11 @@ int sock_getsockopt(struct socket *sock,
case SO_PEERSEC:
return security_socket_getpeersec(sock, optval, optlen,
len);
-
+
+ case SO_CRITICAL:
+ v.val = ((sk->sk_allocation & __GFP_CRITICAL) != 0);
+ break;
+
default:
return(-ENOPROTOOPT);
}
-
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