staging: lustre: move libcfs to lnet layer

The lustre file system has a layered architecture with
libcfs as the lowest layer and LNet layered on top. Then
on top of LNet we run the lustre client. This patch moves
the libcfs module code out of lustre into the lnet tree.
This fits into the long term goal of eventually merging
libcfs into LNet.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
new file mode 100644
index 000000000000..ebc60ac9bb7a
--- /dev/null
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
@@ -0,0 +1,159 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#define DEBUG_SUBSYSTEM S_LNET
+
+#include "../../../include/linux/libcfs/libcfs.h"
+
+#define LNET_MINOR 240
+
+int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
+{
+	if (libcfs_ioctl_is_invalid(data)) {
+		CERROR("LNET: ioctl not correctly formatted\n");
+		return -EINVAL;
+	}
+
+	if (data->ioc_inllen1)
+		data->ioc_inlbuf1 = &data->ioc_bulk[0];
+
+	if (data->ioc_inllen2)
+		data->ioc_inlbuf2 = &data->ioc_bulk[0] +
+			cfs_size_round(data->ioc_inllen1);
+
+	return 0;
+}
+
+int libcfs_ioctl_getdata_len(const struct libcfs_ioctl_hdr __user *arg,
+			     __u32 *len)
+{
+	struct libcfs_ioctl_hdr hdr;
+
+	if (copy_from_user(&hdr, arg, sizeof(hdr)))
+		return -EFAULT;
+
+	if (hdr.ioc_version != LIBCFS_IOCTL_VERSION &&
+	    hdr.ioc_version != LIBCFS_IOCTL_VERSION2) {
+		CERROR("LNET: version mismatch expected %#x, got %#x\n",
+		       LIBCFS_IOCTL_VERSION, hdr.ioc_version);
+		return -EINVAL;
+	}
+
+	*len = hdr.ioc_len;
+
+	return 0;
+}
+
+int libcfs_ioctl_popdata(void __user *arg, void *data, int size)
+{
+	if (copy_to_user(arg, data, size))
+		return -EFAULT;
+	return 0;
+}
+
+static int
+libcfs_psdev_open(struct inode *inode, struct file *file)
+{
+	int    rc = 0;
+
+	if (!inode)
+		return -EINVAL;
+	if (libcfs_psdev_ops.p_open)
+		rc = libcfs_psdev_ops.p_open(0, NULL);
+	else
+		return -EPERM;
+	return rc;
+}
+
+/* called when closing /dev/device */
+static int
+libcfs_psdev_release(struct inode *inode, struct file *file)
+{
+	int    rc = 0;
+
+	if (!inode)
+		return -EINVAL;
+	if (libcfs_psdev_ops.p_close)
+		rc = libcfs_psdev_ops.p_close(0, NULL);
+	else
+		rc = -EPERM;
+	return rc;
+}
+
+static long libcfs_ioctl(struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	struct cfs_psdev_file	 pfile;
+	int    rc = 0;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
+	    _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
+	    _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
+		CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
+		       _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
+		return -EINVAL;
+	}
+
+	/* Handle platform-dependent IOC requests */
+	switch (cmd) {
+	case IOC_LIBCFS_PANIC:
+		if (!capable(CFS_CAP_SYS_BOOT))
+			return -EPERM;
+		panic("debugctl-invoked panic");
+		return 0;
+	}
+
+	if (libcfs_psdev_ops.p_ioctl)
+		rc = libcfs_psdev_ops.p_ioctl(&pfile, cmd, (void __user *)arg);
+	else
+		rc = -EPERM;
+	return rc;
+}
+
+static const struct file_operations libcfs_fops = {
+	.unlocked_ioctl	= libcfs_ioctl,
+	.open		= libcfs_psdev_open,
+	.release	= libcfs_psdev_release,
+};
+
+struct miscdevice libcfs_dev = {
+	.minor = LNET_MINOR,
+	.name = "lnet",
+	.fops = &libcfs_fops,
+};