fs/ntfs/volume.h

   1 /*
   2  * volume.h - Defines for volume structures in NTFS Linux kernel driver. Part
   3  *            of the Linux-NTFS project.
   4  *
   5  * Copyright (c) 2001-2006 Anton Altaparmakov
   6  * Copyright (c) 2002 Richard Russon
   7  *
   8  * This program/include file is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program/include file is distributed in the hope that it will be
  14  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program (in the main directory of the Linux-NTFS
  20  * distribution in the file COPYING); if not, write to the Free Software
  21  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifndef _LINUX_NTFS_VOLUME_H
  25 #define _LINUX_NTFS_VOLUME_H
  26
  27 #include <linux/rwsem.h>
  28 #include <linux/uidgid.h>
  29
  30 #include "types.h"
  31 #include "layout.h"
  32
  33 /*
  34  * The NTFS in memory super block structure.
  35  */
  36 typedef struct {
  37         /*
  38          * FIXME: Reorder to have commonly used together element within the
  39          * same cache line, aiming at a cache line size of 32 bytes. Aim for
  40          * 64 bytes for less commonly used together elements. Put most commonly
  41          * used elements to front of structure. Obviously do this only when the
  42          * structure has stabilized... (AIA)
  43          */
  44         /* Device specifics. */
  45         struct super_block *sb;         /* Pointer back to the super_block. */
  46         LCN nr_blocks;                  /* Number of sb->s_blocksize bytes
  47                                            sized blocks on the device. */
  48         /* Configuration provided by user at mount time. */
  49         unsigned long flags;            /* Miscellaneous flags, see below. */
  50         kuid_t uid;                     /* uid that files will be mounted as. */
  51         kgid_t gid;                     /* gid that files will be mounted as. */
  52         umode_t fmask;                  /* The mask for file permissions. */
  53         umode_t dmask;                  /* The mask for directory
  54                                            permissions. */
  55         u8 mft_zone_multiplier;         /* Initial mft zone multiplier. */
  56         u8 on_errors;                   /* What to do on filesystem errors. */
  57         /* NTFS bootsector provided information. */
  58         u16 sector_size;                /* in bytes */
  59         u8 sector_size_bits;            /* log2(sector_size) */
  60         u32 cluster_size;               /* in bytes */
  61         u32 cluster_size_mask;          /* cluster_size - 1 */
  62         u8 cluster_size_bits;           /* log2(cluster_size) */
  63         u32 mft_record_size;            /* in bytes */
  64         u32 mft_record_size_mask;       /* mft_record_size - 1 */
  65         u8 mft_record_size_bits;        /* log2(mft_record_size) */
  66         u32 index_record_size;          /* in bytes */
  67         u32 index_record_size_mask;     /* index_record_size - 1 */
  68         u8 index_record_size_bits;      /* log2(index_record_size) */
  69         LCN nr_clusters;                /* Volume size in clusters == number of
  70                                            bits in lcn bitmap. */
  71         LCN mft_lcn;                    /* Cluster location of mft data. */
  72         LCN mftmirr_lcn;                /* Cluster location of copy of mft. */
  73         u64 serial_no;                  /* The volume serial number. */
  74         /* Mount specific NTFS information. */
  75         u32 upcase_len;                 /* Number of entries in upcase[]. */
  76         ntfschar *upcase;               /* The upcase table. */
  77
  78         s32 attrdef_size;               /* Size of the attribute definition
  79                                            table in bytes. */
  80         ATTR_DEF *attrdef;              /* Table of attribute definitions.
  81                                            Obtained from FILE_AttrDef. */
  82
  83 #ifdef NTFS_RW
  84         /* Variables used by the cluster and mft allocators. */
  85         s64 mft_data_pos;               /* Mft record number at which to
  86                                            allocate the next mft record. */
  87         LCN mft_zone_start;             /* First cluster of the mft zone. */
  88         LCN mft_zone_end;               /* First cluster beyond the mft zone. */
  89         LCN mft_zone_pos;               /* Current position in the mft zone. */
  90         LCN data1_zone_pos;             /* Current position in the first data
  91                                            zone. */
  92         LCN data2_zone_pos;             /* Current position in the second data
  93                                            zone. */
  94 #endif /* NTFS_RW */
  95
  96         struct inode *mft_ino;          /* The VFS inode of $MFT. */
  97
  98         struct inode *mftbmp_ino;       /* Attribute inode for $MFT/$BITMAP. */
  99         struct rw_semaphore mftbmp_lock; /* Lock for serializing accesses to the
 100                                             mft record bitmap ($MFT/$BITMAP). */
 101 #ifdef NTFS_RW
 102         struct inode *mftmirr_ino;      /* The VFS inode of $MFTMirr. */
 103         int mftmirr_size;               /* Size of mft mirror in mft records. */
 104
 105         struct inode *logfile_ino;      /* The VFS inode of $LogFile. */
 106 #endif /* NTFS_RW */
 107
 108         struct inode *lcnbmp_ino;       /* The VFS inode of $Bitmap. */
 109         struct rw_semaphore lcnbmp_lock; /* Lock for serializing accesses to the
 110                                             cluster bitmap ($Bitmap/$DATA). */
 111
 112         struct inode *vol_ino;          /* The VFS inode of $Volume. */
 113         VOLUME_FLAGS vol_flags;         /* Volume flags. */
 114         u8 major_ver;                   /* Ntfs major version of volume. */
 115         u8 minor_ver;                   /* Ntfs minor version of volume. */
 116
 117         struct inode *root_ino;         /* The VFS inode of the root
 118                                            directory. */
 119         struct inode *secure_ino;       /* The VFS inode of $Secure (NTFS3.0+
 120                                            only, otherwise NULL). */
 121         struct inode *extend_ino;       /* The VFS inode of $Extend (NTFS3.0+
 122                                            only, otherwise NULL). */
 123 #ifdef NTFS_RW
 124         /* $Quota stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
 125         struct inode *quota_ino;        /* The VFS inode of $Quota. */
 126         struct inode *quota_q_ino;      /* Attribute inode for $Quota/$Q. */
 127         /* $UsnJrnl stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
 128         struct inode *usnjrnl_ino;      /* The VFS inode of $UsnJrnl. */
 129         struct inode *usnjrnl_max_ino;  /* Attribute inode for $UsnJrnl/$Max. */
 130         struct inode *usnjrnl_j_ino;    /* Attribute inode for $UsnJrnl/$J. */
 131 #endif /* NTFS_RW */
 132         struct nls_table *nls_map;
 133 } ntfs_volume;
 134
 135 /*
 136  * Defined bits for the flags field in the ntfs_volume structure.
 137  */
 138 typedef enum {
 139         NV_Errors,              /* 1: Volume has errors, prevent remount rw. */
 140         NV_ShowSystemFiles,     /* 1: Return system files in ntfs_readdir(). */
 141         NV_CaseSensitive,       /* 1: Treat file names as case sensitive and
 142                                       create filenames in the POSIX namespace.
 143                                       Otherwise be case insensitive but still
 144                                       create file names in POSIX namespace. */
 145         NV_LogFileEmpty,        /* 1: $LogFile journal is empty. */
 146         NV_QuotaOutOfDate,      /* 1: $Quota is out of date. */
 147         NV_UsnJrnlStamped,      /* 1: $UsnJrnl has been stamped. */
 148         NV_SparseEnabled,       /* 1: May create sparse files. */
 149 } ntfs_volume_flags;
 150
 151 /*
 152  * Macro tricks to expand the NVolFoo(), NVolSetFoo(), and NVolClearFoo()
 153  * functions.
 154  */
 155 #define DEFINE_NVOL_BIT_OPS(flag)                                       \
 156 static inline int NVol##flag(ntfs_volume *vol)          \
 157 {                                                       \
 158         return test_bit(NV_##flag, &(vol)->flags);      \
 159 }                                                       \
 160 static inline void NVolSet##flag(ntfs_volume *vol)      \
 161 {                                                       \
 162         set_bit(NV_##flag, &(vol)->flags);              \
 163 }                                                       \
 164 static inline void NVolClear##flag(ntfs_volume *vol)    \
 165 {                                                       \
 166         clear_bit(NV_##flag, &(vol)->flags);            \
 167 }
 168
 169 /* Emit the ntfs volume bitops functions. */
 170 DEFINE_NVOL_BIT_OPS(Errors)
 171 DEFINE_NVOL_BIT_OPS(ShowSystemFiles)
 172 DEFINE_NVOL_BIT_OPS(CaseSensitive)
 173 DEFINE_NVOL_BIT_OPS(LogFileEmpty)
 174 DEFINE_NVOL_BIT_OPS(QuotaOutOfDate)
 175 DEFINE_NVOL_BIT_OPS(UsnJrnlStamped)
 176 DEFINE_NVOL_BIT_OPS(SparseEnabled)
 177
 178 #endif /* _LINUX_NTFS_VOLUME_H */