From 95b2e875b680c66de7b61915a9c7b075de88bc4a Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Mon, 31 Jan 1994 20:25:06 +0000
Subject: Initial revision

---
 libdiskfs/dir-link.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 libdiskfs/dir-link.c

(limited to 'libdiskfs/dir-link.c')

diff --git a/libdiskfs/dir-link.c b/libdiskfs/dir-link.c
new file mode 100644
index 00000000..dbc4677b
--- /dev/null
+++ b/libdiskfs/dir-link.c
@@ -0,0 +1,82 @@
+/* libdiskfs implementation of fs.defs: dir_link
+   Copyright (C) 1992, 1993, 1994 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"
+
+/* Implement dir_link as described in <hurd/fs.defs>. */
+error_t
+diskfs_S_dir_link (struct protid *filecred,
+		   struct protid *dircred,
+		   char *name)
+{
+  struct node *np;
+  struct node *dnp;
+  struct dirstat *ds = alloca (diskfs_dirstat_size);
+  error_t error;
+
+  if (!filecred)
+    return EOPNOTSUPP;
+  
+  np = filecred->po->np;
+  if (readonly)
+    return EROFS;
+  
+  if (!dircred)
+    return EXDEV;
+  
+  dnp = dircred->po->np;
+  mutex_lock (&dnp->lock);
+  /* This lock is safe since a non-directory is inherently a leaf */
+  /* XXX But we don't know yet that it is a non-directory */
+  mutex_lock (&np->lock);
+
+  if (S_ISDIR (np->dn_stat.st_mode))
+    error = EISDIR;
+  else if (np->dn_stat.st_nlink == LINK_MAX - 1)
+    error = EMLINK;
+  if (error)
+    goto out;
+
+  error = diskfs_lookup (dnp, name, CREATE, 0, ds, dircred);
+
+  if (error == EAGAIN)
+    error = EEXIST;
+  if (!error)
+    error = EEXIST;
+  if (error != ENOENT)
+    {
+      diskfs_drop_dirstat (ds);
+      goto out;
+    }
+  
+  np->dn_stat.st_nlink++;
+  np->dn_set_ctime = 1;
+  
+  diskfs_node_update (np, 1);
+
+  error =  diskfs_direnter (dnp, name, np, ds, dircred);
+  if (error)
+    {
+      np->dn_stat.st_nlink--;
+      np->dn_set_ctime = 1;
+    }
+
+ out:
+  mutex_unlock (&dnp->lock);
+  mutex_unlock (&np->lock);
+  return error;
+}
-- 
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