/*
   * 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/mount.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;

  		int err;

  		err = mnt_want_write_file(filp);

  		if (err)
  			return err;

  		if (!inode_owner_or_capable(inode)) {

  			err = -EACCES;
  			goto setflags_out;
  		}
  		if (get_user(flags, (int __user *) arg)) {
  			err = -EFAULT;
  			goto setflags_out;
  		}

  
  		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)) {
  			err = -EPERM;
  			goto setflags_out;
  		}

  
  		/* 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);

  				err = -EPERM;
  				goto setflags_out;

  			}

  		}
  
  		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);

  setflags_out:

  		mnt_drop_write_file(filp);

  		return err;

  	}
  	default:
  		return -ENOTTY;
  	}
  }

  #ifdef CONFIG_COMPAT
  long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  {
  	/* While these ioctl numbers defined with 'long' and have different
  	 * numbers than the 64bit ABI,
  	 * the actual implementation only deals with ints and is compatible.
  	 */
  	switch (cmd) {
  	case JFS_IOC_GETFLAGS32:
  		cmd = JFS_IOC_GETFLAGS;
  		break;
  	case JFS_IOC_SETFLAGS32:
  		cmd = JFS_IOC_SETFLAGS;
  		break;
  	}
  	return jfs_ioctl(filp, cmd, arg);
  }
  #endif