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TOMOYO Linux Cross Reference
Linux/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) 2001,2002 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 "types.h"
 28 
 29 /*
 30  * The NTFS in memory super block structure.
 31  */
 32 typedef struct {
 33         /*
 34          * FIXME: Reorder to have commonly used together element within the
 35          * same cache line, aiming at a cache line size of 32 bytes. Aim for
 36          * 64 bytes for less commonly used together elements. Put most commonly
 37          * used elements to front of structure. Obviously do this only when the
 38          * structure has stabilized... (AIA)
 39          */
 40         /* Device specifics. */
 41         struct super_block *sb;         /* Pointer back to the super_block,
 42                                            so we don't have to get the offset
 43                                            every time. */
 44         LCN nr_blocks;                  /* Number of NTFS_BLOCK_SIZE bytes
 45                                            sized blocks on the device. */
 46         /* Configuration provided by user at mount time. */
 47         unsigned long flags;            /* Miscellaneous flags, see above. */
 48         uid_t uid;                      /* uid that files will be mounted as. */
 49         gid_t gid;                      /* gid that files will be mounted as. */
 50         mode_t fmask;                   /* The mask for file permissions. */
 51         mode_t dmask;                   /* The mask for directory
 52                                            permissions. */
 53         u8 mft_zone_multiplier;         /* Initial mft zone multiplier. */
 54         u8 on_errors;                   /* What to do on file system errors. */
 55         /* NTFS bootsector provided information. */
 56         u16 sector_size;                /* in bytes */
 57         u8 sector_size_bits;            /* log2(sector_size) */
 58         u32 cluster_size;               /* in bytes */
 59         u32 cluster_size_mask;          /* cluster_size - 1 */
 60         u8 cluster_size_bits;           /* log2(cluster_size) */
 61         u32 mft_record_size;            /* in bytes */
 62         u32 mft_record_size_mask;       /* mft_record_size - 1 */
 63         u8 mft_record_size_bits;        /* log2(mft_record_size) */
 64         u32 index_record_size;          /* in bytes */
 65         u32 index_record_size_mask;     /* index_record_size - 1 */
 66         u8 index_record_size_bits;      /* log2(index_record_size) */
 67         LCN nr_clusters;                /* Volume size in clusters == number of
 68                                            bits in lcn bitmap. */
 69         LCN mft_lcn;                    /* Cluster location of mft data. */
 70         LCN mftmirr_lcn;                /* Cluster location of copy of mft. */
 71         u64 serial_no;                  /* The volume serial number. */
 72         /* Mount specific NTFS information. */
 73         u32 upcase_len;                 /* Number of entries in upcase[]. */
 74         uchar_t *upcase;                /* The upcase table. */
 75         LCN mft_zone_start;             /* First cluster of the mft zone. */
 76         LCN mft_zone_end;               /* First cluster beyond the mft zone. */
 77         struct inode *mft_ino;          /* The VFS inode of $MFT. */
 78 
 79         struct inode *mftbmp_ino;       /* Attribute inode for $MFT/$BITMAP. */
 80         struct rw_semaphore mftbmp_lock; /* Lock for serializing accesses to the
 81                                             mft record bitmap ($MFT/$BITMAP). */
 82         unsigned long nr_mft_records;   /* Number of mft records == number of
 83                                            bits in mft bitmap. */
 84 
 85         struct inode *mftmirr_ino;      /* The VFS inode of $MFTMirr. */
 86         struct inode *lcnbmp_ino;       /* The VFS inode of $Bitmap. */
 87         struct rw_semaphore lcnbmp_lock; /* Lock for serializing accesses to the
 88                                             cluster bitmap ($Bitmap/$DATA). */
 89         struct inode *vol_ino;          /* The VFS inode of $Volume. */
 90         unsigned long vol_flags;        /* Volume flags (VOLUME_*). */
 91         u8 major_ver;                   /* Ntfs major version of volume. */
 92         u8 minor_ver;                   /* Ntfs minor version of volume. */
 93         struct inode *root_ino;         /* The VFS inode of the root
 94                                            directory. */
 95         struct inode *secure_ino;       /* The VFS inode of $Secure (NTFS3.0+
 96                                            only, otherwise NULL). */
 97         struct nls_table *nls_map;
 98 } ntfs_volume;
 99 
100 /*
101  * Defined bits for the flags field in the ntfs_volume structure.
102  */
103 typedef enum {
104         NV_Errors,              /* 1: Volume has errors, prevent remount rw. */
105         NV_ShowSystemFiles,     /* 1: Return system files in ntfs_readdir(). */
106         NV_CaseSensitive,       /* 1: Treat file names as case sensitive and
107                                       create filenames in the POSIX namespace.
108                                       Otherwise be case insensitive and create
109                                       file names in WIN32 namespace. */
110 } ntfs_volume_flags;
111 
112 /*
113  * Macro tricks to expand the NVolFoo(), NVolSetFoo(), and NVolClearFoo()
114  * functions.
115  */
116 #define NVOL_FNS(flag)                                  \
117 static inline int NVol##flag(ntfs_volume *vol)          \
118 {                                                       \
119         return test_bit(NV_##flag, &(vol)->flags);      \
120 }                                                       \
121 static inline void NVolSet##flag(ntfs_volume *vol)      \
122 {                                                       \
123         set_bit(NV_##flag, &(vol)->flags);              \
124 }                                                       \
125 static inline void NVolClear##flag(ntfs_volume *vol)    \
126 {                                                       \
127         clear_bit(NV_##flag, &(vol)->flags);            \
128 }
129 
130 /* Emit the ntfs volume bitops functions. */
131 NVOL_FNS(Errors)
132 NVOL_FNS(ShowSystemFiles)
133 NVOL_FNS(CaseSensitive)
134 
135 #endif /* _LINUX_NTFS_VOLUME_H */
136 
137 

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