fs/ioctl.c

   1 /*
   2  *  linux/fs/ioctl.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 #include <linux/config.h>
   8 #include <linux/mm.h>
   9 #include <linux/smp_lock.h>
  10 #include <linux/file.h>
  11 #include <linux/fs.h>
  12 #include <linux/security.h>
  13 #include <linux/module.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/vserver/inode.h>
  16 #include <linux/vserver/xid.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/uaccess.h>
  20 #include <asm/ioctls.h>
  21
  22 #ifdef  CONFIG_VSERVER_LEGACY
  23 extern int vx_proc_ioctl(struct inode *, struct file *,
  24         unsigned int, unsigned long);
  25 #endif
  26
  27 static int file_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
  28 {
  29         int error;
  30         int block;
  31         struct inode * inode = filp->f_dentry->d_inode;
  32         int __user *p = (int __user *)arg;
  33
  34         switch (cmd) {
  35                 case FIBMAP:
  36                 {
  37                         struct address_space *mapping = filp->f_mapping;
  38                         int res;
  39                         /* do we support this mess? */
  40                         if (!mapping->a_ops->bmap)
  41                                 return -EINVAL;
  42                         if (!capable(CAP_SYS_RAWIO))
  43                                 return -EPERM;
  44                         if ((error = get_user(block, p)) != 0)
  45                                 return error;
  46
  47                         res = mapping->a_ops->bmap(mapping, block);
  48                         return put_user(res, p);
  49                 }
  50                 case FIGETBSZ:
  51                         if (inode->i_sb == NULL)
  52                                 return -EBADF;
  53                         return put_user(inode->i_sb->s_blocksize, p);
  54                 case FIONREAD:
  55                         return put_user(i_size_read(inode) - filp->f_pos, p);
  56         }
  57         if (filp->f_op && filp->f_op->ioctl)
  58                 return filp->f_op->ioctl(inode, filp, cmd, arg);
  59         return -ENOTTY;
  60 }
  61
  62
  63 asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
  64 {
  65         struct file * filp;
  66         unsigned int flag;
  67         int on, error = -EBADF;
  68
  69         filp = fget(fd);
  70         if (!filp)
  71                 goto out;
  72
  73         error = security_file_ioctl(filp, cmd, arg);
  74         if (error) {
  75                 fput(filp);
  76                 goto out;
  77         }
  78
  79         lock_kernel();
  80         switch (cmd) {
  81                 case FIOCLEX:
  82                         set_close_on_exec(fd, 1);
  83                         break;
  84
  85                 case FIONCLEX:
  86                         set_close_on_exec(fd, 0);
  87                         break;
  88
  89                 case FIONBIO:
  90                         if ((error = get_user(on, (int __user *)arg)) != 0)
  91                                 break;
  92                         flag = O_NONBLOCK;
  93 #ifdef __sparc__
  94                         /* SunOS compatibility item. */
  95                         if(O_NONBLOCK != O_NDELAY)
  96                                 flag |= O_NDELAY;
  97 #endif
  98                         if (on)
  99                                 filp->f_flags |= flag;
 100                         else
 101                                 filp->f_flags &= ~flag;
 102                         break;
 103
 104                 case FIOASYNC:
 105                         if ((error = get_user(on, (int __user *)arg)) != 0)
 106                                 break;
 107                         flag = on ? FASYNC : 0;
 108
 109                         /* Did FASYNC state change ? */
 110                         if ((flag ^ filp->f_flags) & FASYNC) {
 111                                 if (filp->f_op && filp->f_op->fasync)
 112                                         error = filp->f_op->fasync(fd, filp, on);
 113                                 else error = -ENOTTY;
 114                         }
 115                         if (error != 0)
 116                                 break;
 117
 118                         if (on)
 119                                 filp->f_flags |= FASYNC;
 120                         else
 121                                 filp->f_flags &= ~FASYNC;
 122                         break;
 123
 124                 case FIOQSIZE:
 125                         if (S_ISDIR(filp->f_dentry->d_inode->i_mode) ||
 126                             S_ISREG(filp->f_dentry->d_inode->i_mode) ||
 127                             S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
 128                                 loff_t res = inode_get_bytes(filp->f_dentry->d_inode);
 129                                 error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
 130                         }
 131                         else
 132                                 error = -ENOTTY;
 133                         break;
 134 #ifdef  CONFIG_VSERVER_LEGACY
 135 #ifndef CONFIG_INOXID_NONE
 136                 case FIOC_GETXID: {
 137                         struct inode *inode = filp->f_dentry->d_inode;
 138
 139                         /* fixme: if stealth, return -ENOTTY */
 140                         error = -EPERM;
 141                         if (capable(CAP_CONTEXT))
 142                                 error = put_user(inode->i_xid, (int *) arg);
 143                         break;
 144                 }
 145                 case FIOC_SETXID: {
 146                         struct inode *inode = filp->f_dentry->d_inode;
 147                         int xid;
 148
 149                         /* fixme: if stealth, return -ENOTTY */
 150                         error = -EPERM;
 151                         if (!capable(CAP_CONTEXT))
 152                                 break;
 153                         error = -EROFS;
 154                         if (IS_RDONLY(inode))
 155                                 break;
 156                         error = -ENOSYS;
 157                         if (!(inode->i_sb->s_flags & MS_TAGXID))
 158                                 break;
 159                         error = -EFAULT;
 160                         if (get_user(xid, (int *) arg))
 161                                 break;
 162                         error = 0;
 163                         inode->i_xid = (xid & 0xFFFF);
 164                         inode->i_ctime = CURRENT_TIME;
 165                         mark_inode_dirty(inode);
 166                         break;
 167                 }
 168 #endif
 169                 case FIOC_GETXFLG:
 170                 case FIOC_SETXFLG:
 171                         error = -ENOTTY;
 172                         if (filp->f_dentry->d_inode->i_sb->s_magic == PROC_SUPER_MAGIC)
 173                                 error = vx_proc_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
 174                         break;
 175 #endif
 176                 default:
 177                         error = -ENOTTY;
 178                         if (S_ISREG(filp->f_dentry->d_inode->i_mode))
 179                                 error = file_ioctl(filp, cmd, arg);
 180                         else if (filp->f_op && filp->f_op->ioctl)
 181                                 error = filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
 182         }
 183         unlock_kernel();
 184         fput(filp);
 185
 186 out:
 187         return error;
 188 }
 189
 190 /*
 191  * Platforms implementing 32 bit compatibility ioctl handlers in
 192  * modules need this exported
 193  */
 194 #ifdef CONFIG_COMPAT
 195 EXPORT_SYMBOL(sys_ioctl);
 196 #endif