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/*
* 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 <asm/segment.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/ioctl.h>
#include <linux/sched.h>
#include <linux/mm.h>
int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
unsigned long arg)
{
int err;
unsigned long flags;
ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
switch (cmd) {
case EXT2_IOC_GETFLAGS:
err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
if (err)
return err;
put_user(inode->u.ext2_i.i_flags, (int *) arg);
return 0;
case EXT2_IOC_SETFLAGS:
err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
if (err)
return err;
flags = get_user((int *) arg);
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the super user when the security level is zero.
*/
if ((flags & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) ^
(inode->u.ext2_i.i_flags &
(EXT2_APPEND_FL | EXT2_IMMUTABLE_FL))) {
/* This test looks nicer. Thanks to Pauline Middelink */
if (!fsuser() || securelevel > 0)
return -EPERM;
} else
if ((current->fsuid != inode->i_uid) && !fsuser())
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
inode->u.ext2_i.i_flags = flags;
if (flags & EXT2_APPEND_FL)
inode->i_flags |= S_APPEND;
else
inode->i_flags &= ~S_APPEND;
if (flags & EXT2_IMMUTABLE_FL)
inode->i_flags |= S_IMMUTABLE;
else
inode->i_flags &= ~S_IMMUTABLE;
if (flags & EXT2_NOATIME_FL)
inode->i_flags |= MS_NOATIME;
else
inode->i_flags &= ~MS_NOATIME;
inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
return 0;
case EXT2_IOC_GETVERSION:
err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
if (err)
return err;
put_user(inode->u.ext2_i.i_version, (int *) arg);
return 0;
case EXT2_IOC_SETVERSION:
if ((current->fsuid != inode->i_uid) && !fsuser())
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
if (err)
return err;
inode->u.ext2_i.i_version = get_user((int *) arg);
inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
return 0;
default:
return -ENOTTY;
}
}
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