/*
   * ialloc.c
   *
   * PURPOSE
   *	Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
   *

   * COPYRIGHT
   *	This file is distributed under the terms of the GNU General Public
   *	License (GPL). Copies of the GPL can be obtained from:
   *		ftp://prep.ai.mit.edu/pub/gnu/GPL
   *	Each contributing author retains all rights to their own work.
   *
   *  (C) 1998-2001 Ben Fennema
   *
   * HISTORY
   *
   *  02/24/99 blf  Created.
   *
   */
  
  #include "udfdecl.h"
  #include <linux/fs.h>

  #include <linux/sched.h>
  #include <linux/slab.h>
  
  #include "udf_i.h"
  #include "udf_sb.h"

  void udf_free_inode(struct inode *inode)

  {
  	struct super_block *sb = inode->i_sb;
  	struct udf_sb_info *sbi = UDF_SB(sb);

  	mutex_lock(&sbi->s_alloc_mutex);

  	if (sbi->s_lvid_bh) {
  		struct logicalVolIntegrityDescImpUse *lvidiu =
  							udf_sb_lvidiu(sbi);

  		if (S_ISDIR(inode->i_mode))

  			le32_add_cpu(&lvidiu->numDirs, -1);

  		else

  			le32_add_cpu(&lvidiu->numFiles, -1);

  		udf_updated_lvid(sb);

  	}

  	mutex_unlock(&sbi->s_alloc_mutex);

  	udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);

  }

  struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err)

  {
  	struct super_block *sb = dir->i_sb;
  	struct udf_sb_info *sbi = UDF_SB(sb);

  	struct inode *inode;

  	int block;

  	uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;

  	struct udf_inode_info *iinfo;
  	struct udf_inode_info *dinfo = UDF_I(dir);

  
  	inode = new_inode(sb);

  	if (!inode) {

  		*err = -ENOMEM;
  		return NULL;
  	}
  	*err = -ENOSPC;

  	iinfo = UDF_I(inode);

  	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
  		iinfo->i_efe = 1;
  		if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
  			sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
  		iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  					    sizeof(struct extendedFileEntry),
  					    GFP_KERNEL);
  	} else {
  		iinfo->i_efe = 0;
  		iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  					    sizeof(struct fileEntry),
  					    GFP_KERNEL);
  	}
  	if (!iinfo->i_ext.i_data) {
  		iput(inode);
  		*err = -ENOMEM;
  		return NULL;
  	}

  	block = udf_new_block(dir->i_sb, NULL,

  			      dinfo->i_location.partitionReferenceNum,

  			      start, err);

  	if (*err) {

  		iput(inode);
  		return NULL;
  	}

  	if (sbi->s_lvid_bh) {

  		struct logicalVolIntegrityDescImpUse *lvidiu;
  
  		iinfo->i_unique = lvid_get_unique_id(sb);
  		mutex_lock(&sbi->s_alloc_mutex);
  		lvidiu = udf_sb_lvidiu(sbi);

  		if (S_ISDIR(mode))

  			le32_add_cpu(&lvidiu->numDirs, 1);

  		else

  			le32_add_cpu(&lvidiu->numFiles, 1);

  		udf_updated_lvid(sb);

  		mutex_unlock(&sbi->s_alloc_mutex);

  	}

  
  	inode_init_owner(inode, dir, mode);

  	iinfo->i_location.logicalBlockNum = block;
  	iinfo->i_location.partitionReferenceNum =
  				dinfo->i_location.partitionReferenceNum;

  	inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);

  	inode->i_blocks = 0;

  	iinfo->i_lenEAttr = 0;
  	iinfo->i_lenAlloc = 0;
  	iinfo->i_use = 0;

  	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))

  		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;

  	else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))

  		iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;

  	else

  		iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;

  	inode->i_mtime = inode->i_atime = inode->i_ctime =

  		iinfo->i_crtime = current_fs_time(inode->i_sb);

  	insert_inode_hash(inode);
  	mark_inode_dirty(inode);

  	*err = 0;
  	return inode;
  }