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TOMOYO Linux Cross Reference
Linux/fs/ntfs/volume.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * volume.h - Defines for volume structures in NTFS Linux kernel driver. Part
  4  *            of the Linux-NTFS project.
  5  *
  6  * Copyright (c) 2001-2006 Anton Altaparmakov
  7  * Copyright (c) 2002 Richard Russon
  8  */
  9 
 10 #ifndef _LINUX_NTFS_VOLUME_H
 11 #define _LINUX_NTFS_VOLUME_H
 12 
 13 #include <linux/rwsem.h>
 14 #include <linux/uidgid.h>
 15 
 16 #include "types.h"
 17 #include "layout.h"
 18 
 19 /*
 20  * The NTFS in memory super block structure.
 21  */
 22 typedef struct {
 23         /*
 24          * FIXME: Reorder to have commonly used together element within the
 25          * same cache line, aiming at a cache line size of 32 bytes. Aim for
 26          * 64 bytes for less commonly used together elements. Put most commonly
 27          * used elements to front of structure. Obviously do this only when the
 28          * structure has stabilized... (AIA)
 29          */
 30         /* Device specifics. */
 31         struct super_block *sb;         /* Pointer back to the super_block. */
 32         LCN nr_blocks;                  /* Number of sb->s_blocksize bytes
 33                                            sized blocks on the device. */
 34         /* Configuration provided by user at mount time. */
 35         unsigned long flags;            /* Miscellaneous flags, see below. */
 36         kuid_t uid;                     /* uid that files will be mounted as. */
 37         kgid_t gid;                     /* gid that files will be mounted as. */
 38         umode_t fmask;                  /* The mask for file permissions. */
 39         umode_t dmask;                  /* The mask for directory
 40                                            permissions. */
 41         u8 mft_zone_multiplier;         /* Initial mft zone multiplier. */
 42         u8 on_errors;                   /* What to do on filesystem errors. */
 43         /* NTFS bootsector provided information. */
 44         u16 sector_size;                /* in bytes */
 45         u8 sector_size_bits;            /* log2(sector_size) */
 46         u32 cluster_size;               /* in bytes */
 47         u32 cluster_size_mask;          /* cluster_size - 1 */
 48         u8 cluster_size_bits;           /* log2(cluster_size) */
 49         u32 mft_record_size;            /* in bytes */
 50         u32 mft_record_size_mask;       /* mft_record_size - 1 */
 51         u8 mft_record_size_bits;        /* log2(mft_record_size) */
 52         u32 index_record_size;          /* in bytes */
 53         u32 index_record_size_mask;     /* index_record_size - 1 */
 54         u8 index_record_size_bits;      /* log2(index_record_size) */
 55         LCN nr_clusters;                /* Volume size in clusters == number of
 56                                            bits in lcn bitmap. */
 57         LCN mft_lcn;                    /* Cluster location of mft data. */
 58         LCN mftmirr_lcn;                /* Cluster location of copy of mft. */
 59         u64 serial_no;                  /* The volume serial number. */
 60         /* Mount specific NTFS information. */
 61         u32 upcase_len;                 /* Number of entries in upcase[]. */
 62         ntfschar *upcase;               /* The upcase table. */
 63 
 64         s32 attrdef_size;               /* Size of the attribute definition
 65                                            table in bytes. */
 66         ATTR_DEF *attrdef;              /* Table of attribute definitions.
 67                                            Obtained from FILE_AttrDef. */
 68 
 69 #ifdef NTFS_RW
 70         /* Variables used by the cluster and mft allocators. */
 71         s64 mft_data_pos;               /* Mft record number at which to
 72                                            allocate the next mft record. */
 73         LCN mft_zone_start;             /* First cluster of the mft zone. */
 74         LCN mft_zone_end;               /* First cluster beyond the mft zone. */
 75         LCN mft_zone_pos;               /* Current position in the mft zone. */
 76         LCN data1_zone_pos;             /* Current position in the first data
 77                                            zone. */
 78         LCN data2_zone_pos;             /* Current position in the second data
 79                                            zone. */
 80 #endif /* NTFS_RW */
 81 
 82         struct inode *mft_ino;          /* The VFS inode of $MFT. */
 83 
 84         struct inode *mftbmp_ino;       /* Attribute inode for $MFT/$BITMAP. */
 85         struct rw_semaphore mftbmp_lock; /* Lock for serializing accesses to the
 86                                             mft record bitmap ($MFT/$BITMAP). */
 87 #ifdef NTFS_RW
 88         struct inode *mftmirr_ino;      /* The VFS inode of $MFTMirr. */
 89         int mftmirr_size;               /* Size of mft mirror in mft records. */
 90 
 91         struct inode *logfile_ino;      /* The VFS inode of $LogFile. */
 92 #endif /* NTFS_RW */
 93 
 94         struct inode *lcnbmp_ino;       /* The VFS inode of $Bitmap. */
 95         struct rw_semaphore lcnbmp_lock; /* Lock for serializing accesses to the
 96                                             cluster bitmap ($Bitmap/$DATA). */
 97 
 98         struct inode *vol_ino;          /* The VFS inode of $Volume. */
 99         VOLUME_FLAGS vol_flags;         /* Volume flags. */
100         u8 major_ver;                   /* Ntfs major version of volume. */
101         u8 minor_ver;                   /* Ntfs minor version of volume. */
102 
103         struct inode *root_ino;         /* The VFS inode of the root
104                                            directory. */
105         struct inode *secure_ino;       /* The VFS inode of $Secure (NTFS3.0+
106                                            only, otherwise NULL). */
107         struct inode *extend_ino;       /* The VFS inode of $Extend (NTFS3.0+
108                                            only, otherwise NULL). */
109 #ifdef NTFS_RW
110         /* $Quota stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
111         struct inode *quota_ino;        /* The VFS inode of $Quota. */
112         struct inode *quota_q_ino;      /* Attribute inode for $Quota/$Q. */
113         /* $UsnJrnl stuff is NTFS3.0+ specific.  Unused/NULL otherwise. */
114         struct inode *usnjrnl_ino;      /* The VFS inode of $UsnJrnl. */
115         struct inode *usnjrnl_max_ino;  /* Attribute inode for $UsnJrnl/$Max. */
116         struct inode *usnjrnl_j_ino;    /* Attribute inode for $UsnJrnl/$J. */
117 #endif /* NTFS_RW */
118         struct nls_table *nls_map;
119 } ntfs_volume;
120 
121 /*
122  * Defined bits for the flags field in the ntfs_volume structure.
123  */
124 typedef enum {
125         NV_Errors,              /* 1: Volume has errors, prevent remount rw. */
126         NV_ShowSystemFiles,     /* 1: Return system files in ntfs_readdir(). */
127         NV_CaseSensitive,       /* 1: Treat file names as case sensitive and
128                                       create filenames in the POSIX namespace.
129                                       Otherwise be case insensitive but still
130                                       create file names in POSIX namespace. */
131         NV_LogFileEmpty,        /* 1: $LogFile journal is empty. */
132         NV_QuotaOutOfDate,      /* 1: $Quota is out of date. */
133         NV_UsnJrnlStamped,      /* 1: $UsnJrnl has been stamped. */
134         NV_SparseEnabled,       /* 1: May create sparse files. */
135 } ntfs_volume_flags;
136 
137 /*
138  * Macro tricks to expand the NVolFoo(), NVolSetFoo(), and NVolClearFoo()
139  * functions.
140  */
141 #define DEFINE_NVOL_BIT_OPS(flag)                                       \
142 static inline int NVol##flag(ntfs_volume *vol)          \
143 {                                                       \
144         return test_bit(NV_##flag, &(vol)->flags);      \
145 }                                                       \
146 static inline void NVolSet##flag(ntfs_volume *vol)      \
147 {                                                       \
148         set_bit(NV_##flag, &(vol)->flags);              \
149 }                                                       \
150 static inline void NVolClear##flag(ntfs_volume *vol)    \
151 {                                                       \
152         clear_bit(NV_##flag, &(vol)->flags);            \
153 }
154 
155 /* Emit the ntfs volume bitops functions. */
156 DEFINE_NVOL_BIT_OPS(Errors)
157 DEFINE_NVOL_BIT_OPS(ShowSystemFiles)
158 DEFINE_NVOL_BIT_OPS(CaseSensitive)
159 DEFINE_NVOL_BIT_OPS(LogFileEmpty)
160 DEFINE_NVOL_BIT_OPS(QuotaOutOfDate)
161 DEFINE_NVOL_BIT_OPS(UsnJrnlStamped)
162 DEFINE_NVOL_BIT_OPS(SparseEnabled)
163 
164 #endif /* _LINUX_NTFS_VOLUME_H */
165 

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