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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) 2001-2006 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 */
179 

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