1 files changed, 71 insertions, 1 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f4cbf0c306c6..3600ec700d58 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -100,6 +100,7 @@ enum {
         Opt_addr, Opt_mountaddr, Opt_clientaddr,
         Opt_lookupcache,
         Opt_fscache_uniq,
+        Opt_local_lock,
 
         /* Special mount options */
         Opt_userspace, Opt_deprecated, Opt_sloppy,
@@ -171,6 +172,7 @@ static const match_table_t nfs_mount_option_tokens = {
 
         { Opt_lookupcache, "lookupcache=%s" },
         { Opt_fscache_uniq, "fsc=%s" },
+        { Opt_local_lock, "local_lock=%s" },
 
         { Opt_err, NULL }
 };
@@ -236,6 +238,22 @@ static match_table_t nfs_lookupcache_tokens = {
         { Opt_lookupcache_err, NULL }
 };
 
+enum {
+        Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
+        Opt_local_lock_none,
+
+        Opt_local_lock_err
+};
+
+static match_table_t nfs_local_lock_tokens = {
+        { Opt_local_lock_all, "all" },
+        { Opt_local_lock_flock, "flock" },
+        { Opt_local_lock_posix, "posix" },
+        { Opt_local_lock_none, "none" },
+
+        { Opt_local_lock_err, NULL }
+};
+
 
 static void nfs_umount_begin(struct super_block *);
 static int  nfs_statfs(struct dentry *, struct kstatfs *);
@@ -622,6 +640,7 @@ 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;
+        int local_flock, local_fcntl;
 
         seq_printf(m, ",vers=%u", version);
         seq_printf(m, ",rsize=%u", nfss->rsize);
@@ -670,6 +689,18 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
                 else
                         seq_printf(m, ",lookupcache=pos");
         }
+
+        local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
+        local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
+
+        if (!local_flock && !local_fcntl)
+                seq_printf(m, ",local_lock=none");
+        else if (local_flock && local_fcntl)
+                seq_printf(m, ",local_lock=all");
+        else if (local_flock)
+                seq_printf(m, ",local_lock=flock");
+        else
+                seq_printf(m, ",local_lock=posix");
 }
 
 /*
@@ -1017,9 +1048,13 @@ static int nfs_parse_mount_options(char *raw,
                         break;
                 case Opt_lock:
                         mnt->flags &= ~NFS_MOUNT_NONLM;
+                        mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+                                        NFS_MOUNT_LOCAL_FCNTL);
                         break;
                 case Opt_nolock:
                         mnt->flags |= NFS_MOUNT_NONLM;
+                        mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+                                       NFS_MOUNT_LOCAL_FCNTL);
                         break;
                 case Opt_v2:
                         mnt->flags &= ~NFS_MOUNT_VER3;
@@ -1420,6 +1455,34 @@ static int nfs_parse_mount_options(char *raw,
                         mnt->fscache_uniq = string;
                         mnt->options |= NFS_OPTION_FSCACHE;
                         break;
+                case Opt_local_lock:
+                        string = match_strdup(args);
+                        if (string == NULL)
+                                goto out_nomem;
+                        token = match_token(string, nfs_local_lock_tokens,
+                                        args);
+                        kfree(string);
+                        switch (token) {
+                        case Opt_local_lock_all:
+                                mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+                                               NFS_MOUNT_LOCAL_FCNTL);
+                                break;
+                        case Opt_local_lock_flock:
+                                mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
+                                break;
+                        case Opt_local_lock_posix:
+                                mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
+                                break;
+                        case Opt_local_lock_none:
+                                mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+                                                NFS_MOUNT_LOCAL_FCNTL);
+                                break;
+                        default:
+                                dfprintk(MOUNT, "NFS:   invalid "
+                                                "local_lock argument\n");
+                                return 0;
+                        };
+                        break;
 
                 /*
                  * Special options
@@ -1825,6 +1888,12 @@ static int nfs_validate_mount_data(void *options,
                 if (!args->nfs_server.hostname)
                         goto out_nomem;
 
+                if (!(data->flags & NFS_MOUNT_NONLM))
+                        args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
+                                         NFS_MOUNT_LOCAL_FCNTL);
+                else
+                        args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
+                                        NFS_MOUNT_LOCAL_FCNTL);
                 /*
                  * The legacy version 6 binary mount data from userspace has a
                  * field used only to transport selinux information into the
@@ -2441,7 +2510,8 @@ static void nfs4_fill_super(struct super_block *sb)
 
 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
 {
-        args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
+        args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
+                         NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
 }
 
 static int nfs4_validate_text_mount_data(void *options,