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root/fs/ntfs/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 "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. */
        uid_t uid;                      /* uid that files will be mounted as. */
        gid_t gid;                      /* gid that files will be mounted as. */
        mode_t fmask;                   /* The mask for file permissions. */
        mode_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 */

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