1 files changed, 64 insertions, 0 deletions
diff --git a/libdiskfs/file-chown.c b/libdiskfs/file-chown.c
new file mode 100644
index 00000000..ecb851f2
--- /dev/null
+++ b/libdiskfs/file-chown.c
@@ -0,0 +1,64 @@
+/* libdiskfs implementetation of fs.defs: file_chown
+   Copyright (C) 1992, 1993, 1994, 1996, 1999 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+#include "fs_S.h"
+
+/* Implement file_chown as described in <hurd/fs.defs>. */
+kern_return_t
+diskfs_S_file_chown (struct protid *cred,
+		     uid_t uid,
+		     gid_t gid)
+{
+  if (uid == (uid_t) -1 && gid == (gid_t) -1) /* No change requested.  */
+    return 0;
+
+  CHANGE_NODE_FIELD (cred,
+		   ({
+		     err = fshelp_isowner (&np->dn_stat, cred->user);
+		     if (err
+			 || (((uid != (uid_t) -1
+			       && !idvec_contains (cred->user->uids, uid))
+			      || (gid != (gid_t) -1
+				  && !idvec_contains (cred->user->gids, gid)))
+			     && !idvec_contains (cred->user->uids, 0)))
+		       err = EPERM;
+		     else
+		       {
+			 if (uid != (uid_t) -1)
+			   err = diskfs_validate_owner_change (np, uid);
+			 if (!err && gid != (gid_t) -1)
+			   err = diskfs_validate_group_change (np, gid);
+			 if (!err)
+			   {
+			     if (uid != (uid_t) -1)
+			       {
+				 np->dn_stat.st_uid = uid;
+				 if (np->author_tracks_uid)
+				   np->dn_stat.st_author = uid;
+			       }
+			     if (gid != (gid_t) -1)
+			       np->dn_stat.st_gid = gid;
+			     np->dn_set_ctime = 1;
+			     if (np->filemod_reqs)
+			       diskfs_notice_filechange(np,
+							FILE_CHANGED_META,
+							0, 0);
+			   }
+		       }
+		   }));
+}