[PATCH] NFSv4: Add {get,set,list}xattr methods for nfs4

 Add {get,set,list}xattr methods for nfs4.  The new methods are no-ops, to be
 used by subsequent ACL patch.

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 38 insertions, 1 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index a5a8cb3159a0..1b14d17ae9a4 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2732,6 +2732,34 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
         return status;
 }
 
+
+int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
+                size_t buflen, int flags)
+{
+        return -EOPNOTSUPP;
+}
+
+/* The getxattr man page suggests returning -ENODATA for unknown attributes,
+ * and that's what we'll do for e.g. user attributes that haven't been set.
+ * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
+ * attributes in kernel-managed attribute namespaces. */
+ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
+                size_t buflen)
+{
+        return -EOPNOTSUPP;
+}
+
+ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
+{
+        ssize_t len = 0;
+
+        if (buf && buflen < len)
+                return -ERANGE;
+        if (buf)
+                memcpy(buf, "", 0);
+        return 0;
+}
+
 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
         .recover_open   = nfs4_open_reclaim,
         .recover_lock   = nfs4_lock_reclaim,
@@ -2742,11 +2770,20 @@ struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
         .recover_lock   = nfs4_lock_expired,
 };
 
+static struct inode_operations nfs4_file_inode_operations = {
+        .permission     = nfs_permission,
+        .getattr        = nfs_getattr,
+        .setattr        = nfs_setattr,
+        .getxattr       = nfs4_getxattr,
+        .setxattr       = nfs4_setxattr,
+        .listxattr      = nfs4_listxattr,
+};
+
 struct nfs_rpc_ops      nfs_v4_clientops = {
         .version        = 4,                    /* protocol version */
         .dentry_ops     = &nfs4_dentry_operations,
         .dir_inode_ops  = &nfs4_dir_inode_operations,
-        .file_inode_ops = &nfs_file_inode_operations,
+        .file_inode_ops = &nfs4_file_inode_operations,
         .getroot        = nfs4_proc_get_root,
         .getattr        = nfs4_proc_getattr,
         .setattr        = nfs4_proc_setattr,