text-based mount.nfs: Use new parser to handle 'addr=' and 'clientaddr='

Introduce, but don't yet use, functions that will eventually replace
append_addr_opt() and append_clientaddr_opt().

Note the behavioral change in append_addr_opt() -- it simply removes
any previous 'addr=' rather than throwing an error.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index f73521f2c7812e199b6c6ab37b26d1aa1b9bad47..b2e8d2f351cf9680574f3f24a690927e8341a217 100644 (file)
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -40,6 +40,7 @@
 #include "stropts.h"
 #include "error.h"
 #include "network.h"
+#include "parse_opt.h"
 
 #ifdef HAVE_RPCSVC_NFS_PROT_H
 #include <rpcsvc/nfs_prot.h>
@@ -234,6 +235,60 @@ static int append_clientaddr_opt(struct sockaddr_in *saddr, char **extra_opts)
        return 1;
 }
 
+/*
+ * Append the 'addr=' option to the options string to pass a resolved
+ * server address to the kernel.  After a successful mount, this address
+ * is also added to /etc/mtab for use when unmounting.
+ *
+ * If 'addr=' is already present, we strip it out.  This prevents users
+ * from setting a bogus 'addr=' option themselves, and also allows bg
+ * retries to recompute the server's address, in case it has changed.
+ *
+ * Returns 1 if 'addr=' option appended successfully;
+ * otherwise zero.
+ */
+static int append_addr_option(struct sockaddr_in *saddr,
+                          struct mount_options *options)
+{
+       char new_option[24];
+
+       po_remove_all(options, "addr");
+
+       snprintf(new_option, sizeof(new_option) - 1,
+                       "addr=%s", inet_ntoa(saddr->sin_addr));
+
+       if (po_append(options, new_option) == PO_SUCCEEDED)
+               return 1;
+       return 0;
+}
+
+/*
+ * Called to discover our address and append an appropriate 'clientaddr='
+ * option to the options string.
+ *
+ * Returns 1 if 'clientaddr=' option created successfully or if
+ * 'clientaddr=' option is already present; otherwise zero.
+ */
+static int append_clientaddr_option(struct sockaddr_in *saddr,
+                                   struct mount_options *options)
+{
+       struct sockaddr_in my_addr;
+       char new_option[32];
+
+       if (po_contains(options, "clientaddr") == PO_SUCCEEDED)
+               return 1;
+
+       if (!get_client_address(saddr, &my_addr))
+               return 0;
+
+       snprintf(new_option, sizeof(new_option) - 1,
+                       "clientaddr=%s", inet_ntoa(my_addr.sin_addr));
+
+       if (po_append(options, new_option) == PO_SUCCEEDED)
+               return 1;
+       return 0;
+}
+
 /*
  * nfsmount_s - Mount an NFSv2 or v3 file system using C string options
  *