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/*
* linux/fs/jfs/ioctl.c
*
* Copyright (C) 2006 Herbert Poetzl
* adapted from Remy Card's ext2/ioctl.c
*/
#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include "jfs_incore.h"
#include "jfs_dinode.h"
#include "jfs_inode.h"
static struct {
long jfs_flag;
long ext2_flag;
} jfs_map[] = {
{JFS_NOATIME_FL, FS_NOATIME_FL},
{JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
{JFS_SYNC_FL, FS_SYNC_FL},
{JFS_SECRM_FL, FS_SECRM_FL},
{JFS_UNRM_FL, FS_UNRM_FL},
{JFS_APPEND_FL, FS_APPEND_FL},
{JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
{0, 0},
};
static long jfs_map_ext2(unsigned long flags, int from)
{
int index=0;
long mapped=0;
while (jfs_map[index].jfs_flag) {
if (from) {
if (jfs_map[index].ext2_flag & flags)
mapped |= jfs_map[index].jfs_flag;
} else {
if (jfs_map[index].jfs_flag & flags)
mapped |= jfs_map[index].ext2_flag;
}
index++;
}
return mapped;
}
long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_dentry->d_inode;
struct jfs_inode_info *jfs_inode = JFS_IP(inode);
unsigned int flags;
switch (cmd) {
case JFS_IOC_GETFLAGS:
jfs_get_inode_flags(jfs_inode);
flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
flags = jfs_map_ext2(flags, 0);
return put_user(flags, (int __user *) arg);
case JFS_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;
flags = jfs_map_ext2(flags, 1);
if (!S_ISDIR(inode->i_mode))
flags &= ~JFS_DIRSYNC_FL;
/* Is it quota file? Do not allow user to mess with it */
if (IS_NOQUOTA(inode))
return -EPERM;
/* Lock against other parallel changes of flags */
mutex_lock(&inode->i_mutex);
jfs_get_inode_flags(jfs_inode);
oldflags = jfs_inode->mode2;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*/
if ((oldflags & JFS_IMMUTABLE_FL) ||
((flags ^ oldflags) &
(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
return -EPERM;
}
}
flags = flags & JFS_FL_USER_MODIFIABLE;
flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
jfs_inode->mode2 = flags;
jfs_set_inode_flags(inode);
mutex_unlock(&inode->i_mutex);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
return 0;
}
default:
return -ENOTTY;
}
}
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