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![Christoph Hellwig](/assets/img/avatar_default.png)
sys_ioctl() was only exported for our first version of compat ioctl handling. Now that the whole compat ioctl handling mess is more or less sorted out there are no more modular users left and we can kill it. There's one exception and that's sparc64's solaris compat module, but sparc64 has it's own export predating the generic one by years for that which this patch leaves untouched. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
176 lines
3.7 KiB
C
176 lines
3.7 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 <asm/uaccess.h>
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#include <asm/ioctls.h>
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static long do_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 file_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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int error;
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int block;
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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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{
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struct address_space *mapping = filp->f_mapping;
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int res;
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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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if ((error = get_user(block, p)) != 0)
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return error;
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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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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 do_ioctl(filp, cmd, arg);
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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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* 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 vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
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{
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unsigned int flag;
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int on, error = 0;
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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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if ((error = get_user(on, (int __user *)arg)) != 0)
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break;
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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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break;
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case FIOASYNC:
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if ((error = get_user(on, (int __user *)arg)) != 0)
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break;
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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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}
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else error = -ENOTTY;
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}
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if (error != 0)
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break;
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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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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 = inode_get_bytes(filp->f_path.dentry->d_inode);
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error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
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}
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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 = do_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 = 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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