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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ioctl.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/syscalls.h>
8#include <linux/mm.h>
9#include <linux/smp_lock.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/security.h>
14#include <linux/module.h>
15
16#include <asm/uaccess.h>
17#include <asm/ioctls.h>
18
19static long do_ioctl(struct file *filp, unsigned int cmd,
20 unsigned long arg)
21{
22 int error = -ENOTTY;
23
24 if (!filp->f_op)
25 goto out;
26
27 if (filp->f_op->unlocked_ioctl) {
28 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
29 if (error == -ENOIOCTLCMD)
30 error = -EINVAL;
31 goto out;
Andrew Morton64d67d22007-07-15 23:41:02 -070032 } else if (filp->f_op->ioctl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 lock_kernel();
Andrew Morton64d67d22007-07-15 23:41:02 -070034 error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
35 filp, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 unlock_kernel();
37 }
38
39 out:
40 return error;
41}
42
43static int file_ioctl(struct file *filp, unsigned int cmd,
44 unsigned long arg)
45{
46 int error;
47 int block;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -080048 struct inode * inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 int __user *p = (int __user *)arg;
50
51 switch (cmd) {
52 case FIBMAP:
53 {
54 struct address_space *mapping = filp->f_mapping;
55 int res;
56 /* do we support this mess? */
57 if (!mapping->a_ops->bmap)
58 return -EINVAL;
59 if (!capable(CAP_SYS_RAWIO))
60 return -EPERM;
61 if ((error = get_user(block, p)) != 0)
62 return error;
63
64 lock_kernel();
65 res = mapping->a_ops->bmap(mapping, block);
66 unlock_kernel();
67 return put_user(res, p);
68 }
69 case FIGETBSZ:
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return put_user(inode->i_sb->s_blocksize, p);
71 case FIONREAD:
72 return put_user(i_size_read(inode) - filp->f_pos, p);
73 }
74
75 return do_ioctl(filp, cmd, arg);
76}
77
78/*
79 * When you add any new common ioctls to the switches above and below
80 * please update compat_sys_ioctl() too.
81 *
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.
84 */
85int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
86{
87 unsigned int flag;
88 int on, error = 0;
89
90 switch (cmd) {
91 case FIOCLEX:
92 set_close_on_exec(fd, 1);
93 break;
94
95 case FIONCLEX:
96 set_close_on_exec(fd, 0);
97 break;
98
99 case FIONBIO:
100 if ((error = get_user(on, (int __user *)arg)) != 0)
101 break;
102 flag = O_NONBLOCK;
103#ifdef __sparc__
104 /* SunOS compatibility item. */
105 if(O_NONBLOCK != O_NDELAY)
106 flag |= O_NDELAY;
107#endif
108 if (on)
109 filp->f_flags |= flag;
110 else
111 filp->f_flags &= ~flag;
112 break;
113
114 case FIOASYNC:
115 if ((error = get_user(on, (int __user *)arg)) != 0)
116 break;
117 flag = on ? FASYNC : 0;
118
119 /* Did FASYNC state change ? */
120 if ((flag ^ filp->f_flags) & FASYNC) {
121 if (filp->f_op && filp->f_op->fasync) {
122 lock_kernel();
123 error = filp->f_op->fasync(fd, filp, on);
124 unlock_kernel();
125 }
126 else error = -ENOTTY;
127 }
128 if (error != 0)
129 break;
130
131 if (on)
132 filp->f_flags |= FASYNC;
133 else
134 filp->f_flags &= ~FASYNC;
135 break;
136
137 case FIOQSIZE:
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800138 if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
139 S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
140 S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
141 loff_t res = inode_get_bytes(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
143 }
144 else
145 error = -ENOTTY;
146 break;
147 default:
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800148 if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 error = file_ioctl(filp, cmd, arg);
150 else
151 error = do_ioctl(filp, cmd, arg);
152 break;
153 }
154 return error;
155}
156
157asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
158{
159 struct file * filp;
160 int error = -EBADF;
161 int fput_needed;
162
163 filp = fget_light(fd, &fput_needed);
164 if (!filp)
165 goto out;
166
167 error = security_file_ioctl(filp, cmd, arg);
168 if (error)
169 goto out_fput;
170
171 error = vfs_ioctl(filp, fd, cmd, arg);
172 out_fput:
173 fput_light(filp, fput_needed);
174 out:
175 return error;
176}