The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/volume.h

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    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 */

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