/*
   * volume.h - Defines for volume structures in NTFS Linux kernel driver. Part
   *	      of the Linux-NTFS project.
   *
   * Copyright (c) 2001-2006 Anton Altaparmakov
   * Copyright (c) 2002 Richard Russon
   *
   * This program/include file is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as published
   * by the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program/include file is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program (in the main directory of the Linux-NTFS
   * distribution in the file COPYING); if not, write to the Free Software
   * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #ifndef _LINUX_NTFS_VOLUME_H
  #define _LINUX_NTFS_VOLUME_H
  
  #include <linux/rwsem.h>
  #include <linux/uidgid.h>
  
  #include "types.h"
  #include "layout.h"
  
  /*
   * The NTFS in memory super block structure.
   */
  typedef struct {
  	/*
  	 * FIXME: Reorder to have commonly used together element within the
  	 * same cache line, aiming at a cache line size of 32 bytes. Aim for
  	 * 64 bytes for less commonly used together elements. Put most commonly
  	 * used elements to front of structure. Obviously do this only when the
  	 * structure has stabilized... (AIA)
  	 */
  	/* Device specifics. */
  	struct super_block *sb;		/* Pointer back to the super_block. */
  	LCN nr_blocks;			/* Number of sb->s_blocksize bytes
  					   sized blocks on the device. */
  	/* Configuration provided by user at mount time. */
  	unsigned long flags;		/* Miscellaneous flags, see below. */
  	kuid_t uid;			/* uid that files will be mounted as. */
  	kgid_t gid;			/* gid that files will be mounted as. */
  	umode_t fmask;			/* The mask for file permissions. */
  	umode_t dmask;			/* The mask for directory
  					   permissions. */
  	u8 mft_zone_multiplier;		/* Initial mft zone multiplier. */
  	u8 on_errors;			/* What to do on filesystem errors. */
  	/* NTFS bootsector provided information. */
  	u16 sector_size;		/* in bytes */
  	u8 sector_size_bits;		/* log2(sector_size) */
  	u32 cluster_size;		/* in bytes */
  	u32 cluster_size_mask;		/* cluster_size - 1 */
  	u8 cluster_size_bits;		/* log2(cluster_size) */
  	u32 mft_record_size;		/* in bytes */
  	u32 mft_record_size_mask;	/* mft_record_size - 1 */
  	u8 mft_record_size_bits;	/* log2(mft_record_size) */
  	u32 index_record_size;		/* in bytes */
  	u32 index_record_size_mask;	/* index_record_size - 1 */
  	u8 index_record_size_bits;	/* log2(index_record_size) */
  	LCN nr_clusters;		/* Volume size in clusters == number of
  					   bits in lcn bitmap. */
  	LCN mft_lcn;			/* Cluster location of mft data. */
  	LCN mftmirr_lcn;		/* Cluster location of copy of mft. */
  	u64 serial_no;			/* The volume serial number. */
  	/* Mount specific NTFS information. */
  	u32 upcase_len;			/* Number of entries in upcase[]. */
  	ntfschar *upcase;		/* The upcase table. */
  
  	s32 attrdef_size;		/* Size of the attribute definition
  					   table in bytes. */
  	ATTR_DEF *attrdef;		/* Table of attribute definitions.
  					   Obtained from FILE_AttrDef. */
  
  #ifdef NTFS_RW
  	/* Variables used by the cluster and mft allocators. */
  	s64 mft_data_pos;		/* Mft record number at which to
  					   allocate the next mft record. */
  	LCN mft_zone_start;		/* First cluster of the mft zone. */
  	LCN mft_zone_end;		/* First cluster beyond the mft zone. */
  	LCN mft_zone_pos;		/* Current position in the mft zone. */
  	LCN data1_zone_pos;		/* Current position in the first data
  					   zone. */
  	LCN data2_zone_pos;		/* Current position in the second data
  					   zone. */
  #endif /* NTFS_RW */
  
  	struct inode *mft_ino;		/* The VFS inode of $MFT. */
  
  	struct inode *mftbmp_ino;	/* Attribute inode for $MFT/$BITMAP. */
  	struct rw_semaphore mftbmp_lock; /* Lock for serializing accesses to the
  					    mft record bitmap ($MFT/$BITMAP). */
  #ifdef NTFS_RW
  	struct inode *mftmirr_ino;	/* The VFS inode of $MFTMirr. */
  	int mftmirr_size;		/* Size of mft mirror in mft records. */
  
  	struct inode *logfile_ino;	/* The VFS inode of $LogFile. */
  #endif /* NTFS_RW */
  
  	struct inode *lcnbmp_ino;	/* The VFS inode of $Bitmap. */
  	struct rw_semaphore lcnbmp_lock; /* Lock for serializing accesses to the
  					    cluster bitmap ($Bitmap/$DATA). */
  
  	struct inode *vol_ino;		/* The VFS inode of $Volume. */
  	VOLUME_FLAGS vol_flags;		/* Volume flags. */
  	u8 major_ver;			/* Ntfs major version of volume. */
  	u8 minor_ver;			/* Ntfs minor version of volume. */
  
  	struct inode *root_ino;		/* The VFS inode of the root
  					   directory. */
  	struct inode *secure_ino;	/* The VFS inode of $Secure (NTFS3.0+
  					   only, otherwise NULL). */
  	struct inode *extend_ino;	/* The VFS inode of $Extend (NTFS3.0+
  					   only, otherwise NULL). */
  #ifdef NTFS_RW
  	/* $Quota stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
  	struct inode *quota_ino;	/* The VFS inode of $Quota. */
  	struct inode *quota_q_ino;	/* Attribute inode for $Quota/$Q. */
  	/* $UsnJrnl stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
  	struct inode *usnjrnl_ino;	/* The VFS inode of $UsnJrnl. */
  	struct inode *usnjrnl_max_ino;	/* Attribute inode for $UsnJrnl/$Max. */
  	struct inode *usnjrnl_j_ino;	/* Attribute inode for $UsnJrnl/$J. */
  #endif /* NTFS_RW */
  	struct nls_table *nls_map;
  } ntfs_volume;
  
  /*
   * Defined bits for the flags field in the ntfs_volume structure.
   */
  typedef enum {
  	NV_Errors,		/* 1: Volume has errors, prevent remount rw. */
  	NV_ShowSystemFiles,	/* 1: Return system files in ntfs_readdir(). */
  	NV_CaseSensitive,	/* 1: Treat file names as case sensitive and
  				      create filenames in the POSIX namespace.
  				      Otherwise be case insensitive but still
  				      create file names in POSIX namespace. */
  	NV_LogFileEmpty,	/* 1: $LogFile journal is empty. */
  	NV_QuotaOutOfDate,	/* 1: $Quota is out of date. */
  	NV_UsnJrnlStamped,	/* 1: $UsnJrnl has been stamped. */
  	NV_SparseEnabled,	/* 1: May create sparse files. */
  } ntfs_volume_flags;
  
  /*
   * Macro tricks to expand the NVolFoo(), NVolSetFoo(), and NVolClearFoo()
   * functions.
   */
  #define DEFINE_NVOL_BIT_OPS(flag)					\
  static inline int NVol##flag(ntfs_volume *vol)		\
  {							\
  	return test_bit(NV_##flag, &(vol)->flags);	\
  }							\
  static inline void NVolSet##flag(ntfs_volume *vol)	\
  {							\
  	set_bit(NV_##flag, &(vol)->flags);		\
  }							\
  static inline void NVolClear##flag(ntfs_volume *vol)	\
  {							\
  	clear_bit(NV_##flag, &(vol)->flags);		\
  }
  
  /* Emit the ntfs volume bitops functions. */
  DEFINE_NVOL_BIT_OPS(Errors)
  DEFINE_NVOL_BIT_OPS(ShowSystemFiles)
  DEFINE_NVOL_BIT_OPS(CaseSensitive)
  DEFINE_NVOL_BIT_OPS(LogFileEmpty)
  DEFINE_NVOL_BIT_OPS(QuotaOutOfDate)
  DEFINE_NVOL_BIT_OPS(UsnJrnlStamped)
  DEFINE_NVOL_BIT_OPS(SparseEnabled)
  
  #endif /* _LINUX_NTFS_VOLUME_H */