4 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/smp_lock.h>
9 #include <linux/file.h>
11 #include <linux/security.h>
13 #include <asm/uaccess.h>
14 #include <asm/ioctls.h>
16 static int file_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
20 struct inode * inode = filp->f_dentry->d_inode;
21 int __user *p = (int __user *)arg;
26 struct address_space *mapping = filp->f_mapping;
28 /* do we support this mess? */
29 if (!mapping->a_ops->bmap)
31 if (!capable(CAP_SYS_RAWIO))
33 if ((error = get_user(block, p)) != 0)
36 res = mapping->a_ops->bmap(mapping, block);
37 return put_user(res, p);
40 if (inode->i_sb == NULL)
42 return put_user(inode->i_sb->s_blocksize, p);
44 return put_user(i_size_read(inode) - filp->f_pos, p);
46 if (filp->f_op && filp->f_op->ioctl)
47 return filp->f_op->ioctl(inode, filp, cmd, arg);
52 asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
56 int on, error = -EBADF;
62 error = security_file_ioctl(filp, cmd, arg);
71 set_close_on_exec(fd, 1);
75 set_close_on_exec(fd, 0);
79 if ((error = get_user(on, (int __user *)arg)) != 0)
83 /* SunOS compatibility item. */
84 if(O_NONBLOCK != O_NDELAY)
88 filp->f_flags |= flag;
90 filp->f_flags &= ~flag;
94 if ((error = get_user(on, (int __user *)arg)) != 0)
96 flag = on ? FASYNC : 0;
98 /* Did FASYNC state change ? */
99 if ((flag ^ filp->f_flags) & FASYNC) {
100 if (filp->f_op && filp->f_op->fasync)
101 error = filp->f_op->fasync(fd, filp, on);
102 else error = -ENOTTY;
108 filp->f_flags |= FASYNC;
110 filp->f_flags &= ~FASYNC;
114 if (S_ISDIR(filp->f_dentry->d_inode->i_mode) ||
115 S_ISREG(filp->f_dentry->d_inode->i_mode) ||
116 S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
117 loff_t res = inode_get_bytes(filp->f_dentry->d_inode);
118 error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
125 if (S_ISREG(filp->f_dentry->d_inode->i_mode))
126 error = file_ioctl(filp, cmd, arg);
127 else if (filp->f_op && filp->f_op->ioctl)
128 error = filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);