fs/ioctl.c

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