diff options
Diffstat (limited to 'fs/ioctl.c')
| -rw-r--r-- | fs/ioctl.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c new file mode 100644 index 000000000000..569209181425 --- /dev/null +++ b/fs/ioctl.c @@ -0,0 +1,186 @@ +/* + * linux/fs/ioctl.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#include <linux/config.h> +#include <linux/syscalls.h> +#include <linux/mm.h> +#include <linux/smp_lock.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/security.h> +#include <linux/module.h> + +#include <asm/uaccess.h> +#include <asm/ioctls.h> + +static long do_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + int error = -ENOTTY; + + if (!filp->f_op) + goto out; + + if (filp->f_op->unlocked_ioctl) { + error = filp->f_op->unlocked_ioctl(filp, cmd, arg); + if (error == -ENOIOCTLCMD) + error = -EINVAL; + goto out; + } else if (filp->f_op->ioctl) { + lock_kernel(); + error = filp->f_op->ioctl(filp->f_dentry->d_inode, + filp, cmd, arg); + unlock_kernel(); + } + + out: + return error; +} + +static int file_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + int error; + int block; + struct inode * inode = filp->f_dentry->d_inode; + int __user *p = (int __user *)arg; + + switch (cmd) { + case FIBMAP: + { + struct address_space *mapping = filp->f_mapping; + int res; + /* do we support this mess? */ + if (!mapping->a_ops->bmap) + return -EINVAL; + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + if ((error = get_user(block, p)) != 0) + return error; + + lock_kernel(); + res = mapping->a_ops->bmap(mapping, block); + unlock_kernel(); + return put_user(res, p); + } + case FIGETBSZ: + if (inode->i_sb == NULL) + return -EBADF; + return put_user(inode->i_sb->s_blocksize, p); + case FIONREAD: + return put_user(i_size_read(inode) - filp->f_pos, p); + } + + return do_ioctl(filp, cmd, arg); +} + +/* + * When you add any new common ioctls to the switches above and below + * please update compat_sys_ioctl() too. + * + * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. + * It's just a simple helper for sys_ioctl and compat_sys_ioctl. + */ +int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg) +{ + unsigned int flag; + int on, error = 0; + + switch (cmd) { + case FIOCLEX: + set_close_on_exec(fd, 1); + break; + + case FIONCLEX: + set_close_on_exec(fd, 0); + break; + + case FIONBIO: + if ((error = get_user(on, (int __user *)arg)) != 0) + break; + flag = O_NONBLOCK; +#ifdef __sparc__ + /* SunOS compatibility item. */ + if(O_NONBLOCK != O_NDELAY) + flag |= O_NDELAY; +#endif + if (on) + filp->f_flags |= flag; + else + filp->f_flags &= ~flag; + break; + + case FIOASYNC: + if ((error = get_user(on, (int __user *)arg)) != 0) + break; + flag = on ? FASYNC : 0; + + /* Did FASYNC state change ? */ + if ((flag ^ filp->f_flags) & FASYNC) { + if (filp->f_op && filp->f_op->fasync) { + lock_kernel(); + error = filp->f_op->fasync(fd, filp, on); + unlock_kernel(); + } + else error = -ENOTTY; + } + if (error != 0) + break; + + if (on) + filp->f_flags |= FASYNC; + else + filp->f_flags &= ~FASYNC; + break; + + case FIOQSIZE: + if (S_ISDIR(filp->f_dentry->d_inode->i_mode) || + S_ISREG(filp->f_dentry->d_inode->i_mode) || + S_ISLNK(filp->f_dentry->d_inode->i_mode)) { + loff_t res = inode_get_bytes(filp->f_dentry->d_inode); + error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0; + } + else + error = -ENOTTY; + break; + default: + if (S_ISREG(filp->f_dentry->d_inode->i_mode)) + error = file_ioctl(filp, cmd, arg); + else + error = do_ioctl(filp, cmd, arg); + break; + } + return error; +} + +asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg) +{ + struct file * filp; + int error = -EBADF; + int fput_needed; + + filp = fget_light(fd, &fput_needed); + if (!filp) + goto out; + + error = security_file_ioctl(filp, cmd, arg); + if (error) + goto out_fput; + + error = vfs_ioctl(filp, fd, cmd, arg); + out_fput: + fput_light(filp, fput_needed); + out: + return error; +} + +/* + * Platforms implementing 32 bit compatibility ioctl handlers in + * modules need this exported + */ +#ifdef CONFIG_COMPAT +EXPORT_SYMBOL(sys_ioctl); +#endif |