mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:46:42 +07:00
67cde59537
Make the needlessly global vfs_ioctl() static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
214 lines
4.5 KiB
C
214 lines
4.5 KiB
C
/*
|
|
* linux/fs/ioctl.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/syscalls.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/security.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/ioctls.h>
|
|
|
|
/**
|
|
* vfs_ioctl - call filesystem specific ioctl methods
|
|
* @filp: open file to invoke ioctl method on
|
|
* @cmd: ioctl command to execute
|
|
* @arg: command-specific argument for ioctl
|
|
*
|
|
* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
|
|
* invokes filesystem specific ->ioctl method. If neither method exists,
|
|
* returns -ENOTTY.
|
|
*
|
|
* Returns 0 on success, -errno on error.
|
|
*/
|
|
static long vfs_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_path.dentry->d_inode,
|
|
filp, cmd, arg);
|
|
unlock_kernel();
|
|
}
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static int ioctl_fibmap(struct file *filp, int __user *p)
|
|
{
|
|
struct address_space *mapping = filp->f_mapping;
|
|
int res, block;
|
|
|
|
/* do we support this mess? */
|
|
if (!mapping->a_ops->bmap)
|
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_RAWIO))
|
|
return -EPERM;
|
|
res = get_user(block, p);
|
|
if (res)
|
|
return res;
|
|
lock_kernel();
|
|
res = mapping->a_ops->bmap(mapping, block);
|
|
unlock_kernel();
|
|
return put_user(res, p);
|
|
}
|
|
|
|
static int file_ioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
int __user *p = (int __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case FIBMAP:
|
|
return ioctl_fibmap(filp, p);
|
|
case FIGETBSZ:
|
|
return put_user(inode->i_sb->s_blocksize, p);
|
|
case FIONREAD:
|
|
return put_user(i_size_read(inode) - filp->f_pos, p);
|
|
}
|
|
|
|
return vfs_ioctl(filp, cmd, arg);
|
|
}
|
|
|
|
static int ioctl_fionbio(struct file *filp, int __user *argp)
|
|
{
|
|
unsigned int flag;
|
|
int on, error;
|
|
|
|
error = get_user(on, argp);
|
|
if (error)
|
|
return error;
|
|
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;
|
|
return error;
|
|
}
|
|
|
|
static int ioctl_fioasync(unsigned int fd, struct file *filp,
|
|
int __user *argp)
|
|
{
|
|
unsigned int flag;
|
|
int on, error;
|
|
|
|
error = get_user(on, argp);
|
|
if (error)
|
|
return error;
|
|
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)
|
|
return error;
|
|
|
|
if (on)
|
|
filp->f_flags |= FASYNC;
|
|
else
|
|
filp->f_flags &= ~FASYNC;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* When you add any new common ioctls to the switches above and below
|
|
* please update compat_sys_ioctl() too.
|
|
*
|
|
* do_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 do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int error = 0;
|
|
int __user *argp = (int __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case FIOCLEX:
|
|
set_close_on_exec(fd, 1);
|
|
break;
|
|
|
|
case FIONCLEX:
|
|
set_close_on_exec(fd, 0);
|
|
break;
|
|
|
|
case FIONBIO:
|
|
error = ioctl_fionbio(filp, argp);
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
error = ioctl_fioasync(fd, filp, argp);
|
|
break;
|
|
|
|
case FIOQSIZE:
|
|
if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
|
|
S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
|
|
S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
|
|
loff_t res =
|
|
inode_get_bytes(filp->f_path.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_path.dentry->d_inode->i_mode))
|
|
error = file_ioctl(filp, cmd, arg);
|
|
else
|
|
error = vfs_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 = do_vfs_ioctl(filp, fd, cmd, arg);
|
|
out_fput:
|
|
fput_light(filp, fput_needed);
|
|
out:
|
|
return error;
|
|
}
|