4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/syscalls.h>
9 #include <linux/smp_lock.h>
10 #include <linux/capability.h>
11 #include <linux/file.h>
13 #include <linux/security.h>
14 #include <linux/module.h>
15 #include <linux/uaccess.h>
17 #include <asm/ioctls.h>
19 static long do_ioctl(struct file
*filp
, unsigned int cmd
,
27 if (filp
->f_op
->unlocked_ioctl
) {
28 error
= filp
->f_op
->unlocked_ioctl(filp
, cmd
, arg
);
29 if (error
== -ENOIOCTLCMD
)
32 } else if (filp
->f_op
->ioctl
) {
34 error
= filp
->f_op
->ioctl(filp
->f_path
.dentry
->d_inode
,
43 static int file_ioctl(struct file
*filp
, unsigned int cmd
,
48 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
49 int __user
*p
= (int __user
*)arg
;
54 struct address_space
*mapping
= filp
->f_mapping
;
56 /* do we support this mess? */
57 if (!mapping
->a_ops
->bmap
)
59 if (!capable(CAP_SYS_RAWIO
))
61 error
= get_user(block
, p
);
65 res
= mapping
->a_ops
->bmap(mapping
, block
);
67 return put_user(res
, p
);
70 return put_user(inode
->i_sb
->s_blocksize
, p
);
72 return put_user(i_size_read(inode
) - filp
->f_pos
, p
);
75 return do_ioctl(filp
, cmd
, arg
);
79 * When you add any new common ioctls to the switches above and below
80 * please update compat_sys_ioctl() too.
82 * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
83 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
85 int vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
93 set_close_on_exec(fd
, 1);
97 set_close_on_exec(fd
, 0);
101 error
= get_user(on
, (int __user
*)arg
);
106 /* SunOS compatibility item. */
107 if (O_NONBLOCK
!= O_NDELAY
)
111 filp
->f_flags
|= flag
;
113 filp
->f_flags
&= ~flag
;
117 error
= get_user(on
, (int __user
*)arg
);
120 flag
= on
? FASYNC
: 0;
122 /* Did FASYNC state change ? */
123 if ((flag
^ filp
->f_flags
) & FASYNC
) {
124 if (filp
->f_op
&& filp
->f_op
->fasync
) {
126 error
= filp
->f_op
->fasync(fd
, filp
, on
);
135 filp
->f_flags
|= FASYNC
;
137 filp
->f_flags
&= ~FASYNC
;
141 if (S_ISDIR(filp
->f_path
.dentry
->d_inode
->i_mode
) ||
142 S_ISREG(filp
->f_path
.dentry
->d_inode
->i_mode
) ||
143 S_ISLNK(filp
->f_path
.dentry
->d_inode
->i_mode
)) {
145 inode_get_bytes(filp
->f_path
.dentry
->d_inode
);
146 error
= copy_to_user((loff_t __user
*)arg
, &res
,
147 sizeof(res
)) ? -EFAULT
: 0;
152 if (S_ISREG(filp
->f_path
.dentry
->d_inode
->i_mode
))
153 error
= file_ioctl(filp
, cmd
, arg
);
155 error
= do_ioctl(filp
, cmd
, arg
);
161 asmlinkage
long sys_ioctl(unsigned int fd
, unsigned int cmd
, unsigned long arg
)
167 filp
= fget_light(fd
, &fput_needed
);
171 error
= security_file_ioctl(filp
, cmd
, arg
);
175 error
= vfs_ioctl(filp
, fd
, cmd
, arg
);
177 fput_light(filp
, fput_needed
);