Viewing file:  ioctl.c (2.14 KB) -rw-r--r--
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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 <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
unsigned long arg)
{
unsigned int flags;
ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
switch (cmd) {
case EXT2_IOC_GETFLAGS:
flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE;
return put_user(flags, (int *) arg);
case EXT2_IOC_SETFLAGS: {
unsigned int oldflags;
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
return -EPERM;
if (get_user(flags, (int *) arg))
return -EFAULT;
oldflags = inode->u.ext2_i.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))
return -EPERM;
}
flags = flags & EXT2_FL_USER_MODIFIABLE;
flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
inode->u.ext2_i.i_flags = flags;
if (flags & EXT2_SYNC_FL)
inode->i_flags |= S_SYNC;
else
inode->i_flags &= ~S_SYNC;
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 |= S_NOATIME;
else
inode->i_flags &= ~S_NOATIME;
inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
return 0;
}
case EXT2_IOC_GETVERSION:
return put_user(inode->i_generation, (int *) arg);
case EXT2_IOC_SETVERSION:
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
if (get_user(inode->i_generation, (int *) arg))
return -EFAULT;
inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
return 0;
default:
return -ENOTTY;
}
}
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