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![Christoph Hellwig](/assets/img/avatar_default.png)
- remove non-standard in/out markers - use tabs for formatting Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Erez Zadok <ezk@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
213 lines
4.5 KiB
C
213 lines
4.5 KiB
C
/*
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* linux/fs/ioctl.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/syscalls.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <linux/capability.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <asm/ioctls.h>
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/**
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* vfs_ioctl - call filesystem specific ioctl methods
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* @filp: open file to invoke ioctl method on
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* @cmd: ioctl command to execute
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* @arg: command-specific argument for ioctl
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*
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* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
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* invokes filesystem specific ->ioctl method. If neither method exists,
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* returns -ENOTTY.
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*
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* Returns 0 on success, -errno on error.
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*/
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long vfs_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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int error = -ENOTTY;
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if (!filp->f_op)
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goto out;
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if (filp->f_op->unlocked_ioctl) {
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error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
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if (error == -ENOIOCTLCMD)
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error = -EINVAL;
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goto out;
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} else if (filp->f_op->ioctl) {
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lock_kernel();
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error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
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filp, cmd, arg);
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unlock_kernel();
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}
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out:
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return error;
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}
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static int ioctl_fibmap(struct file *filp, int __user *p)
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{
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struct address_space *mapping = filp->f_mapping;
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int res, block;
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/* do we support this mess? */
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if (!mapping->a_ops->bmap)
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return -EINVAL;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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res = get_user(block, p);
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if (res)
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return res;
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lock_kernel();
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res = mapping->a_ops->bmap(mapping, block);
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unlock_kernel();
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return put_user(res, p);
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}
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static int file_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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int __user *p = (int __user *)arg;
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switch (cmd) {
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case FIBMAP:
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return ioctl_fibmap(filp, p);
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case FIGETBSZ:
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return put_user(inode->i_sb->s_blocksize, p);
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case FIONREAD:
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return put_user(i_size_read(inode) - filp->f_pos, p);
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}
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return vfs_ioctl(filp, cmd, arg);
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}
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static int ioctl_fionbio(struct file *filp, int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = O_NONBLOCK;
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#ifdef __sparc__
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/* SunOS compatibility item. */
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if (O_NONBLOCK != O_NDELAY)
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flag |= O_NDELAY;
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#endif
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if (on)
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filp->f_flags |= flag;
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else
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filp->f_flags &= ~flag;
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return error;
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}
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static int ioctl_fioasync(unsigned int fd, struct file *filp,
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int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = on ? FASYNC : 0;
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/* Did FASYNC state change ? */
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if ((flag ^ filp->f_flags) & FASYNC) {
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if (filp->f_op && filp->f_op->fasync) {
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lock_kernel();
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error = filp->f_op->fasync(fd, filp, on);
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unlock_kernel();
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} else
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error = -ENOTTY;
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}
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if (error)
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return error;
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if (on)
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filp->f_flags |= FASYNC;
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else
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filp->f_flags &= ~FASYNC;
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return error;
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}
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/*
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* When you add any new common ioctls to the switches above and below
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* please update compat_sys_ioctl() too.
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*
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* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
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* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
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*/
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int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
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unsigned long arg)
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{
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int error = 0;
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int __user *argp = (int __user *)arg;
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switch (cmd) {
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case FIOCLEX:
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set_close_on_exec(fd, 1);
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break;
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case FIONCLEX:
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set_close_on_exec(fd, 0);
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break;
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case FIONBIO:
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error = ioctl_fionbio(filp, argp);
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break;
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case FIOASYNC:
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error = ioctl_fioasync(fd, filp, argp);
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break;
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case FIOQSIZE:
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if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
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S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
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S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
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loff_t res =
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inode_get_bytes(filp->f_path.dentry->d_inode);
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error = copy_to_user((loff_t __user *)arg, &res,
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sizeof(res)) ? -EFAULT : 0;
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} else
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error = -ENOTTY;
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break;
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default:
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if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
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error = file_ioctl(filp, cmd, arg);
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else
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error = vfs_ioctl(filp, cmd, arg);
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break;
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}
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return error;
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}
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asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
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{
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struct file *filp;
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int error = -EBADF;
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int fput_needed;
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filp = fget_light(fd, &fput_needed);
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if (!filp)
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goto out;
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error = security_file_ioctl(filp, cmd, arg);
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if (error)
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goto out_fput;
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error = do_vfs_ioctl(filp, fd, cmd, arg);
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out_fput:
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fput_light(filp, fput_needed);
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out:
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return error;
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}
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