[PATCH 05/10] mount.nfs: Add new API for getting protocol family from netids

Chuck Lever
2009-12-08T18:00:34Z

Introduce a couple of new functions that extract the protocol family
from the value of the proto= and mountproto= mount options.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---

utils/mount/network.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++
utils/mount/network.h | 2 ++
2 files changed, 65 insertions(+), 0 deletions(-)

diff --git a/utils/mount/network.c b/utils/mount/network.c
index 7d9accd..d598fcf 100644
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -1354,6 +1354,40 @@ nfs_nfs_port(struct mount_options *options, unsigned long *port)
}

/*
+ * Returns TRUE and fills in @family if a valid NFS protocol option
+ * is found, or FALSE if the option was specified with an invalid value.
+ */
+int nfs_nfs_proto_family(struct mount_options *options,
+ sa_family_t *family)
+{
+ unsigned long protocol;
+ char *option;
+
+#ifdef HAVE_LIBTIRPC
+ *family = AF_UNSPEC;
+#else
+ *family = AF_INET;
+#endif
+
+ switch (po_rightmost(options, nfs_transport_opttbl)) {
+ case 0: /* udp */
+ return 1;
+ case 1: /* tcp */
+ return 1;
+ case 2: /* proto */
+ option = po_get(options, "proto");
+ if (option != NULL)
+ return nfs_get_proto(option, family, &protocol);
+ }
+
+ /*
+ * NFS transport protocol wasn't specified. Return the
+ * default address family.
+ */
+ return 1;
+}
+
+/*
* "mountprog" is supported only by the legacy mount command. The
* kernel mount client does not support this option.
*
@@ -1466,6 +1500,35 @@ nfs_mount_port(struct mount_options *options, unsigned long *port)
return 1;
}

+/*
+ * Returns TRUE and fills in @family if a valid MNT protocol option
+ * is found, or FALSE if the option was specified with an invalid value.
+ */
+int nfs_mount_proto_family(struct mount_options *options,
+ sa_family_t *family)
+{
+ unsigned long protocol;
+ char *option;
+
+#ifdef HAVE_LIBTIRPC
+ *family = AF_UNSPEC;
+#else
+ *family = AF_INET;
+#endif
+
+ option = po_get(options, "mountproto");
+ if (option != NULL)
+ return nfs_get_proto(option, family, &protocol);
+
+ /*
+ * MNT transport protocol wasn't specified. If the NFS
+ * transport protocol was specified, derive the family
+ * from that; otherwise, return the default family for
+ * NFS.
+ */
+ return nfs_nfs_proto_family(options, family);
+}
+
/**
* nfs_options2pmap - set up pmap structs based on mount options
* @options: pointer to mount options
diff --git a/utils/mount/network.h b/utils/mount/network.h
index 2cdf02e..da095e3 100644
--- a/utils/mount/network.h
+++ b/utils/mount/network.h
@@ -58,6 +58,8 @@ int clnt_ping(struct sockaddr_in *, const unsigned long,

struct mount_options;

+int nfs_nfs_proto_family(struct mount_options *options, sa_family_t *family);
+int nfs_mount_proto_family(struct mount_options *options, sa_family_t *family);
int nfs_nfs_version(struct mount_options *options, unsigned long *version);
int nfs_nfs_protocol(struct mount_options *options, unsigned long *protocol);