src/afs/LINUX/osi_ioctl.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Linux module support routines.
  12  *
  13  */
  14 #include <afsconfig.h>
  15 #include "afs/param.h"
  16
  17
  18 #include <linux/module.h> /* early to avoid printf->printk mapping */
  19 #include "afs/sysincludes.h"
  20 #include "afsincludes.h"
  21 #include <linux/unistd.h>               /* For syscall numbers. */
  22 #include <linux/mm.h>
  23
  24 #ifdef AFS_AMD64_LINUX20_ENV
  25 #include <asm/ia32_unistd.h>
  26 #endif
  27
  28 #if defined(AFS_SPARC64_LINUX26_ENV) && defined(NEED_IOCTL32) && !defined(HAVE_COMPAT_IOCTL)
  29 #include <linux/ioctl32.h>
  30 #endif
  31
  32 #include <linux/slab.h>
  33 #include <linux/init.h>
  34 #include <linux/sched.h>
  35 #include <linux/kernel.h>
  36
  37 #include "osi_compat.h"
  38
  39 extern struct proc_dir_entry *openafs_procfs;
  40 #if defined(NEED_IOCTL32) && !defined(HAVE_COMPAT_IOCTL)
  41 static int ioctl32_done;
  42 #endif
  43
  44 extern asmlinkage long
  45 afs_syscall(long syscall, long parm1, long parm2, long parm3, long parm4);
  46
  47 static int
  48 afs_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
  49           unsigned long arg)
  50 {
  51
  52     struct afsprocdata sysargs;
  53 #ifdef NEED_IOCTL32
  54     struct afsprocdata32 sysargs32;
  55 #endif
  56
  57     if (cmd != VIOC_SYSCALL && cmd != VIOC_SYSCALL32) return -EINVAL;
  58
  59 #ifdef NEED_IOCTL32
  60 # if defined(AFS_S390X_LINUX26_ENV)
  61     if (test_thread_flag(TIF_31BIT))
  62 # elif defined(AFS_AMD64_LINUX20_ENV)
  63     if (test_thread_flag(TIF_IA32))
  64 # else
  65     if (test_thread_flag(TIF_32BIT))
  66 # endif /* AFS_S390X_LINUX26_ENV */
  67     {
  68         if (copy_from_user(&sysargs32, (void *)arg,
  69                            sizeof(struct afsprocdata32)))
  70             return -EFAULT;
  71
  72         return afs_syscall((unsigned long)sysargs32.syscall,
  73                            (unsigned long)sysargs32.param1,
  74                            (unsigned long)sysargs32.param2,
  75                            (unsigned long)sysargs32.param3,
  76                            (unsigned long)sysargs32.param4);
  77     } else
  78 #endif /* NEED_IOCTL32 */
  79     {
  80         if (copy_from_user(&sysargs, (void *)arg, sizeof(struct afsprocdata)))
  81             return -EFAULT;
  82
  83         return afs_syscall(sysargs.syscall, sysargs.param1,
  84                            sysargs.param2, sysargs.param3, sysargs.param4);
  85     }
  86 }
  87
  88 #if defined(HAVE_UNLOCKED_IOCTL) || defined(HAVE_COMPAT_IOCTL)
  89 static long afs_unlocked_ioctl(struct file *file, unsigned int cmd,
  90                                unsigned long arg) {
  91     return afs_ioctl(FILE_INODE(file), file, cmd, arg);
  92 }
  93 #endif
  94
  95 static struct file_operations afs_syscall_fops = {
  96 #ifdef HAVE_UNLOCKED_IOCTL
  97     .unlocked_ioctl = afs_unlocked_ioctl,
  98 #else
  99     .ioctl = afs_ioctl,
 100 #endif
 101 #ifdef HAVE_COMPAT_IOCTL
 102     .compat_ioctl = afs_unlocked_ioctl,
 103 #endif
 104 };
 105
 106 void
 107 osi_ioctl_init(void)
 108 {
 109     struct proc_dir_entry *entry;
 110
 111     entry = afs_proc_create(PROC_SYSCALL_NAME, 0666, openafs_procfs, &afs_syscall_fops);
 112 #if defined(STRUCT_PROC_DIR_ENTRY_HAS_OWNER)
 113     if (entry)
 114         entry->owner = THIS_MODULE;
 115 #endif
 116
 117 #if defined(NEED_IOCTL32) && !defined(HAVE_COMPAT_IOCTL)
 118     if (register_ioctl32_conversion(VIOC_SYSCALL32, NULL) == 0)
 119         ioctl32_done = 1;
 120 #endif
 121 }
 122
 123 void
 124 osi_ioctl_clean(void)
 125 {
 126     remove_proc_entry(PROC_SYSCALL_NAME, openafs_procfs);
 127 #if defined(NEED_IOCTL32) && !defined(HAVE_COMPAT_IOCTL)
 128     if (ioctl32_done)
 129             unregister_ioctl32_conversion(VIOC_SYSCALL32);
 130 #endif
 131 }