1 files changed, 66 insertions, 0 deletions

diff --git a/fs/xfs/support/move.c b/fs/xfs/support/move.c
new file mode 100644
index 000000000000..15b5194f16b2
--- /dev/null
+++ b/fs/xfs/support/move.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include <xfs.h>
+
+/* Read from kernel buffer at src to user/kernel buffer defined
+ * by the uio structure. Advance the pointer in the uio struct
+ * as we go.
+ */
+int
+uio_read(caddr_t src, size_t len, struct uio *uio)
+{
+        size_t  count;
+
+        if (!len || !uio->uio_resid)
+                return 0;
+
+        count = uio->uio_iov->iov_len;
+        if (!count)
+                return 0;
+        if (count > len)
+                count = len;
+
+        if (uio->uio_segflg == UIO_USERSPACE) {
+                if (copy_to_user(uio->uio_iov->iov_base, src, count))
+                        return EFAULT;
+        } else {
+                ASSERT(uio->uio_segflg == UIO_SYSSPACE);
+                memcpy(uio->uio_iov->iov_base, src, count);
+        }
+
+        uio->uio_iov->iov_base = (void*)((char*)uio->uio_iov->iov_base + count);
+        uio->uio_iov->iov_len -= count;
+        uio->uio_offset += count;
+        uio->uio_resid -= count;
+        return 0;
+}