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