4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/config.h>
8 #include <linux/syscalls.h>
10 #include <linux/smp_lock.h>
11 #include <linux/capability.h>
12 #include <linux/file.h>
14 #include <linux/security.h>
15 #include <linux/module.h>
17 #include <asm/uaccess.h>
18 #include <asm/ioctls.h>
20 static long do_ioctl(struct file
*filp
, unsigned int cmd
,
28 if (filp
->f_op
->unlocked_ioctl
) {
29 error
= filp
->f_op
->unlocked_ioctl(filp
, cmd
, arg
);
30 if (error
== -ENOIOCTLCMD
)
33 } else if (filp
->f_op
->ioctl
) {
35 error
= filp
->f_op
->ioctl(filp
->f_dentry
->d_inode
,
44 static int file_ioctl(struct file
*filp
, unsigned int cmd
,
49 struct inode
* inode
= filp
->f_dentry
->d_inode
;
50 int __user
*p
= (int __user
*)arg
;
55 struct address_space
*mapping
= filp
->f_mapping
;
57 /* do we support this mess? */
58 if (!mapping
->a_ops
->bmap
)
60 if (!capable(CAP_SYS_RAWIO
))
62 if ((error
= get_user(block
, p
)) != 0)
66 res
= mapping
->a_ops
->bmap(mapping
, block
);
68 return put_user(res
, p
);
71 if (inode
->i_sb
== NULL
)
73 return put_user(inode
->i_sb
->s_blocksize
, p
);
75 return put_user(i_size_read(inode
) - filp
->f_pos
, p
);
78 return do_ioctl(filp
, cmd
, arg
);
82 * When you add any new common ioctls to the switches above and below
83 * please update compat_sys_ioctl() too.
85 * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
86 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
88 int vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
, unsigned long arg
)
95 set_close_on_exec(fd
, 1);
99 set_close_on_exec(fd
, 0);
103 if ((error
= get_user(on
, (int __user
*)arg
)) != 0)
107 /* SunOS compatibility item. */
108 if(O_NONBLOCK
!= O_NDELAY
)
112 filp
->f_flags
|= flag
;
114 filp
->f_flags
&= ~flag
;
118 if ((error
= get_user(on
, (int __user
*)arg
)) != 0)
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
);
129 else error
= -ENOTTY
;
135 filp
->f_flags
|= FASYNC
;
137 filp
->f_flags
&= ~FASYNC
;
141 if (S_ISDIR(filp
->f_dentry
->d_inode
->i_mode
) ||
142 S_ISREG(filp
->f_dentry
->d_inode
->i_mode
) ||
143 S_ISLNK(filp
->f_dentry
->d_inode
->i_mode
)) {
144 loff_t res
= inode_get_bytes(filp
->f_dentry
->d_inode
);
145 error
= copy_to_user((loff_t __user
*)arg
, &res
, sizeof(res
)) ? -EFAULT
: 0;
151 if (S_ISREG(filp
->f_dentry
->d_inode
->i_mode
))
152 error
= file_ioctl(filp
, cmd
, arg
);
154 error
= do_ioctl(filp
, cmd
, arg
);
160 asmlinkage
long sys_ioctl(unsigned int fd
, unsigned int cmd
, unsigned long arg
)
166 filp
= fget_light(fd
, &fput_needed
);
170 error
= security_file_ioctl(filp
, cmd
, arg
);
174 error
= vfs_ioctl(filp
, fd
, cmd
, arg
);
176 fput_light(filp
, fput_needed
);
182 * Platforms implementing 32 bit compatibility ioctl handlers in
183 * modules need this exported
186 EXPORT_SYMBOL(sys_ioctl
);
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