diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/libcfs/linux/linux-module.c')
-rw-r--r-- | drivers/staging/lustre/lnet/libcfs/linux/linux-module.c | 159 |
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 000000000..ebc60ac9b --- /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, +}; |