120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
|
|
* linux/fs/ext2/ioctl.c
|
|
*
|
|
* Copyright (C) 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
*/
|
|
|
|
#include "ext2.h"
|
|
#include <linux/capability.h>
|
|
#include <linux/time.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <asm/current.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
|
|
int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct ext2_inode_info *ei = EXT2_I(inode);
|
|
unsigned int flags;
|
|
|
|
ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
|
|
|
|
switch (cmd) {
|
|
case EXT2_IOC_GETFLAGS:
|
|
ext2_get_inode_flags(ei);
|
|
flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
|
|
return put_user(flags, (int __user *) arg);
|
|
case EXT2_IOC_SETFLAGS: {
|
|
unsigned int oldflags;
|
|
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
|
|
if (!is_owner_or_cap(inode))
|
|
return -EACCES;
|
|
|
|
if (get_user(flags, (int __user *) arg))
|
|
return -EFAULT;
|
|
|
|
if (!S_ISDIR(inode->i_mode))
|
|
flags &= ~EXT2_DIRSYNC_FL;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
oldflags = ei->i_flags;
|
|
|
|
/*
|
|
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
|
|
* the relevant capability.
|
|
*
|
|
* This test looks nicer. Thanks to Pauline Middelink
|
|
*/
|
|
if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
|
|
if (!capable(CAP_LINUX_IMMUTABLE)) {
|
|
mutex_unlock(&inode->i_mutex);
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
flags = flags & EXT2_FL_USER_MODIFIABLE;
|
|
flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
|
|
ei->i_flags = flags;
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
ext2_set_inode_flags(inode);
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
case EXT2_IOC_GETVERSION:
|
|
return put_user(inode->i_generation, (int __user *) arg);
|
|
case EXT2_IOC_SETVERSION:
|
|
if (!is_owner_or_cap(inode))
|
|
return -EPERM;
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
if (get_user(inode->i_generation, (int __user *) arg))
|
|
return -EFAULT;
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
int ret;
|
|
|
|
/* These are just misnamed, they actually get/put from/to user an int */
|
|
switch (cmd) {
|
|
case EXT2_IOC32_GETFLAGS:
|
|
cmd = EXT2_IOC_GETFLAGS;
|
|
break;
|
|
case EXT2_IOC32_SETFLAGS:
|
|
cmd = EXT2_IOC_SETFLAGS;
|
|
break;
|
|
case EXT2_IOC32_GETVERSION:
|
|
cmd = EXT2_IOC_GETVERSION;
|
|
break;
|
|
case EXT2_IOC32_SETVERSION:
|
|
cmd = EXT2_IOC_SETVERSION;
|
|
break;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
lock_kernel();
|
|
ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
#endif
|