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volume.h
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volume.h
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/*
* 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 */