NFS: Show most mount options via nfs_show_options()

Display all mount options in /proc/mount which may be needed to reconstruct
a previous mount.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 65 insertions, 2 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 3c6f53aa7317..c99ca1f992ce 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -441,10 +441,52 @@ static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
         return sec_flavours[i].str;
 }
 
+static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
+                                    int showdefaults)
+{
+        struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
+
+        switch (sap->sa_family) {
+        case AF_INET: {
+                struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+                seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
+                                NIPQUAD(sin->sin_addr.s_addr));
+                break;
+        }
+        case AF_INET6: {
+                struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+                seq_printf(m, ",mountaddr=" NIP6_FMT,
+                                NIP6(sin6->sin6_addr));
+                break;
+        }
+        default:
+                if (showdefaults)
+                        seq_printf(m, ",mountaddr=unspecified");
+        }
+
+        if (nfss->mountd_version || showdefaults)
+                seq_printf(m, ",mountvers=%u", nfss->mountd_version);
+        if (nfss->mountd_port || showdefaults)
+                seq_printf(m, ",mountport=%u", nfss->mountd_port);
+
+        switch (nfss->mountd_protocol) {
+        case IPPROTO_UDP:
+                seq_printf(m, ",mountproto=udp");
+                break;
+        case IPPROTO_TCP:
+                seq_printf(m, ",mountproto=tcp");
+                break;
+        default:
+                if (showdefaults)
+                        seq_printf(m, ",mountproto=auto");
+        }
+}
+
 /*
  * Describe the mount options in force on this server representation
  */
-static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
+static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
+                                   int showdefaults)
 {
         static const struct proc_nfs_info {
                 int flag;
@@ -452,6 +494,8 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
                 const char *nostr;
         } nfs_info[] = {
                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
+                { NFS_MOUNT_INTR, ",intr", ",nointr" },
+                { NFS_MOUNT_POSIX, ",posix", "" },
                 { NFS_MOUNT_NOCTO, ",nocto", "" },
                 { NFS_MOUNT_NOAC, ",noac", "" },
                 { NFS_MOUNT_NONLM, ",nolock", "" },
@@ -462,10 +506,14 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
         };
         const struct proc_nfs_info *nfs_infop;
         struct nfs_client *clp = nfss->nfs_client;
+        u32 version = clp->rpc_ops->version;
 
-        seq_printf(m, ",vers=%u", clp->rpc_ops->version);
+        seq_printf(m, ",vers=%u", version);
         seq_printf(m, ",rsize=%u", nfss->rsize);
         seq_printf(m, ",wsize=%u", nfss->wsize);
+        if (nfss->bsize != 0)
+                seq_printf(m, ",bsize=%u", nfss->bsize);
+        seq_printf(m, ",namlen=%u", nfss->namelen);
         if (nfss->acregmin != 3*HZ || showdefaults)
                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
         if (nfss->acregmax != 60*HZ || showdefaults)
@@ -482,9 +530,24 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
         }
         seq_printf(m, ",proto=%s",
                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
+        if (version == 4) {
+                if (nfss->port != NFS_PORT)
+                        seq_printf(m, ",port=%u", nfss->port);
+        } else
+                if (nfss->port)
+                        seq_printf(m, ",port=%u", nfss->port);
+
         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
+
+        if (version != 4)
+                nfs_show_mountd_options(m, nfss, showdefaults);
+
+#ifdef CONFIG_NFS_V4
+        if (clp->rpc_ops->version == 4)
+                seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
+#endif
 }
 
 /*