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);