text: /*
   *  linux/fs/hfsplus/ioctl.c
   *
   * Copyright (C) 2003
   * Ethan Benson <erbenson@alaska.net>
   * partially derived from 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)
   *
   * hfsplus ioctls
   */
  
  #include <linux/capability.h>
  #include <linux/fs.h>
  #include <linux/mount.h>
  #include <linux/sched.h>
  #include <asm/uaccess.h>
  #include "hfsplus_fs.h"
  
  /*
   * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
   * the platform firmware which file to boot from
   */
  static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
  {
  	struct dentry *dentry = file->f_path.dentry;
  	struct inode *inode = d_inode(dentry);
  	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  	struct hfsplus_vh *vh = sbi->s_vhdr;
  	struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
  	u32 cnid = (unsigned long)dentry->d_fsdata;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	mutex_lock(&sbi->vh_mutex);
  
  	/* Directory containing the bootable system */
  	vh->finder_info[0] = bvh->finder_info[0] =
  		cpu_to_be32(parent_ino(dentry));
  
  	/*
  	 * Bootloader. Just using the inode here breaks in the case of
  	 * hard links - the firmware wants the ID of the hard link file,
  	 * but the inode points at the indirect inode
  	 */
  	vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);
  
  	/* Per spec, the OS X system folder - same as finder_info[0] here */
  	vh->finder_info[5] = bvh->finder_info[5] =
  		cpu_to_be32(parent_ino(dentry));
  
  	mutex_unlock(&sbi->vh_mutex);
  	return 0;
  }
  
  static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
  {
  	struct inode *inode = file_inode(file);
  	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
  	unsigned int flags = 0;
  
  	if (inode->i_flags & S_IMMUTABLE)
  		flags |= FS_IMMUTABLE_FL;
  	if (inode->i_flags & S_APPEND)
  		flags |= FS_APPEND_FL;
  	if (hip->userflags & HFSPLUS_FLG_NODUMP)
  		flags |= FS_NODUMP_FL;
  
  	return put_user(flags, user_flags);
  }
  
  static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
  {
  	struct inode *inode = file_inode(file);
  	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
  	unsigned int flags, new_fl = 0;
  	int err = 0;
  
  	err = mnt_want_write_file(file);
  	if (err)
  		goto out;
  
  	if (!inode_owner_or_capable(inode)) {
  		err = -EACCES;
  		goto out_drop_write;
  	}
  
  	if (get_user(flags, user_flags)) {
  		err = -EFAULT;
  		goto out_drop_write;
  	}
  
  	mutex_lock(&inode->i_mutex);
  
  	if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
  	    inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
  		if (!capable(CAP_LINUX_IMMUTABLE)) {
  			err = -EPERM;
  			goto out_unlock_inode;
  		}
  	}
  
  	/* don't silently ignore unsupported ext2 flags */
  	if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
  		err = -EOPNOTSUPP;
  		goto out_unlock_inode;
  	}
  
  	if (flags & FS_IMMUTABLE_FL)
  		new_fl |= S_IMMUTABLE;
  
  	if (flags & FS_APPEND_FL)
  		new_fl |= S_APPEND;
  
  	inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
  
  	if (flags & FS_NODUMP_FL)
  		hip->userflags |= HFSPLUS_FLG_NODUMP;
  	else
  		hip->userflags &= ~HFSPLUS_FLG_NODUMP;
  
  	inode->i_ctime = CURRENT_TIME_SEC;
  	mark_inode_dirty(inode);
  
  out_unlock_inode:
  	mutex_unlock(&inode->i_mutex);
  out_drop_write:
  	mnt_drop_write_file(file);
  out:
  	return err;
  }
  
  long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	void __user *argp = (void __user *)arg;
  
  	switch (cmd) {
  	case HFSPLUS_IOC_EXT2_GETFLAGS:
  		return hfsplus_ioctl_getflags(file, argp);
  	case HFSPLUS_IOC_EXT2_SETFLAGS:
  		return hfsplus_ioctl_setflags(file, argp);
  	case HFSPLUS_IOC_BLESS:
  		return hfsplus_ioctl_bless(file, argp);
  	default:
  		return -ENOTTY;
  	}
  }
  