drivers/staging/lustre/lustre/libcfs/linux/linux-module.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38
  39 #include <linux/libcfs/libcfs.h>
  40
  41 #define LNET_MINOR 240
  42
  43 int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
  44 {
  45         struct libcfs_ioctl_hdr   *hdr;
  46         struct libcfs_ioctl_data  *data;
  47         int err;
  48         ENTRY;
  49
  50         hdr = (struct libcfs_ioctl_hdr *)buf;
  51         data = (struct libcfs_ioctl_data *)buf;
  52
  53         err = copy_from_user(buf, (void *)arg, sizeof(*hdr));
  54         if (err)
  55                 RETURN(err);
  56
  57         if (hdr->ioc_version != LIBCFS_IOCTL_VERSION) {
  58                 CERROR("PORTALS: version mismatch kernel vs application\n");
  59                 RETURN(-EINVAL);
  60         }
  61
  62         if (hdr->ioc_len + buf >= end) {
  63                 CERROR("PORTALS: user buffer exceeds kernel buffer\n");
  64                 RETURN(-EINVAL);
  65         }
  66
  67
  68         if (hdr->ioc_len < sizeof(struct libcfs_ioctl_data)) {
  69                 CERROR("PORTALS: user buffer too small for ioctl\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         err = copy_from_user(buf, (void *)arg, hdr->ioc_len);
  74         if (err)
  75                 RETURN(err);
  76
  77         if (libcfs_ioctl_is_invalid(data)) {
  78                 CERROR("PORTALS: ioctl not correctly formatted\n");
  79                 RETURN(-EINVAL);
  80         }
  81
  82         if (data->ioc_inllen1)
  83                 data->ioc_inlbuf1 = &data->ioc_bulk[0];
  84
  85         if (data->ioc_inllen2)
  86                 data->ioc_inlbuf2 = &data->ioc_bulk[0] +
  87                         cfs_size_round(data->ioc_inllen1);
  88
  89         RETURN(0);
  90 }
  91
  92 int libcfs_ioctl_popdata(void *arg, void *data, int size)
  93 {
  94         if (copy_to_user((char *)arg, data, size))
  95                 return -EFAULT;
  96         return 0;
  97 }
  98
  99 extern struct cfs_psdev_ops       libcfs_psdev_ops;
 100
 101 static int
 102 libcfs_psdev_open(struct inode * inode, struct file * file)
 103 {
 104         struct libcfs_device_userstate **pdu = NULL;
 105         int    rc = 0;
 106
 107         if (!inode)
 108                 return (-EINVAL);
 109         pdu = (struct libcfs_device_userstate **)&file->private_data;
 110         if (libcfs_psdev_ops.p_open != NULL)
 111                 rc = libcfs_psdev_ops.p_open(0, (void *)pdu);
 112         else
 113                 return (-EPERM);
 114         return rc;
 115 }
 116
 117 /* called when closing /dev/device */
 118 static int
 119 libcfs_psdev_release(struct inode * inode, struct file * file)
 120 {
 121         struct libcfs_device_userstate *pdu;
 122         int    rc = 0;
 123
 124         if (!inode)
 125                 return (-EINVAL);
 126         pdu = file->private_data;
 127         if (libcfs_psdev_ops.p_close != NULL)
 128                 rc = libcfs_psdev_ops.p_close(0, (void *)pdu);
 129         else
 130                 rc = -EPERM;
 131         return rc;
 132 }
 133
 134 static long libcfs_ioctl(struct file *file,
 135                          unsigned int cmd, unsigned long arg)
 136 {
 137         struct cfs_psdev_file    pfile;
 138         int    rc = 0;
 139
 140         if (current_fsuid() != 0)
 141                 return -EACCES;
 142
 143         if ( _IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
 144              _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
 145              _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR ) {
 146                 CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
 147                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 148                 return (-EINVAL);
 149         }
 150
 151         /* Handle platform-dependent IOC requests */
 152         switch (cmd) {
 153         case IOC_LIBCFS_PANIC:
 154                 if (!cfs_capable(CFS_CAP_SYS_BOOT))
 155                         return (-EPERM);
 156                 panic("debugctl-invoked panic");
 157                 return (0);
 158         case IOC_LIBCFS_MEMHOG:
 159                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
 160                         return -EPERM;
 161                 /* go thought */
 162         }
 163
 164         pfile.off = 0;
 165         pfile.private_data = file->private_data;
 166         if (libcfs_psdev_ops.p_ioctl != NULL)
 167                 rc = libcfs_psdev_ops.p_ioctl(&pfile, cmd, (void *)arg);
 168         else
 169                 rc = -EPERM;
 170         return (rc);
 171 }
 172
 173 static struct file_operations libcfs_fops = {
 174         unlocked_ioctl: libcfs_ioctl,
 175         open :    libcfs_psdev_open,
 176         release :       libcfs_psdev_release
 177 };
 178
 179 psdev_t libcfs_dev = {
 180         LNET_MINOR,
 181         "lnet",
 182         &libcfs_fops
 183 };