Root/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
29#include "types.h"
30#include "layout.h"
31
32/*
33 * The NTFS in memory super block structure.
34 */
35typedef struct {
36    /*
37     * FIXME: Reorder to have commonly used together element within the
38     * same cache line, aiming at a cache line size of 32 bytes. Aim for
39     * 64 bytes for less commonly used together elements. Put most commonly
40     * used elements to front of structure. Obviously do this only when the
41     * structure has stabilized... (AIA)
42     */
43    /* Device specifics. */
44    struct super_block *sb; /* Pointer back to the super_block. */
45    LCN nr_blocks; /* Number of sb->s_blocksize bytes
46                       sized blocks on the device. */
47    /* Configuration provided by user at mount time. */
48    unsigned long flags; /* Miscellaneous flags, see below. */
49    uid_t uid; /* uid that files will be mounted as. */
50    gid_t gid; /* gid that files will be mounted as. */
51    mode_t fmask; /* The mask for file permissions. */
52    mode_t dmask; /* The mask for directory
53                       permissions. */
54    u8 mft_zone_multiplier; /* Initial mft zone multiplier. */
55    u8 on_errors; /* What to do on filesystem errors. */
56    /* NTFS bootsector provided information. */
57    u16 sector_size; /* in bytes */
58    u8 sector_size_bits; /* log2(sector_size) */
59    u32 cluster_size; /* in bytes */
60    u32 cluster_size_mask; /* cluster_size - 1 */
61    u8 cluster_size_bits; /* log2(cluster_size) */
62    u32 mft_record_size; /* in bytes */
63    u32 mft_record_size_mask; /* mft_record_size - 1 */
64    u8 mft_record_size_bits; /* log2(mft_record_size) */
65    u32 index_record_size; /* in bytes */
66    u32 index_record_size_mask; /* index_record_size - 1 */
67    u8 index_record_size_bits; /* log2(index_record_size) */
68    LCN nr_clusters; /* Volume size in clusters == number of
69                       bits in lcn bitmap. */
70    LCN mft_lcn; /* Cluster location of mft data. */
71    LCN mftmirr_lcn; /* Cluster location of copy of mft. */
72    u64 serial_no; /* The volume serial number. */
73    /* Mount specific NTFS information. */
74    u32 upcase_len; /* Number of entries in upcase[]. */
75    ntfschar *upcase; /* The upcase table. */
76
77    s32 attrdef_size; /* Size of the attribute definition
78                       table in bytes. */
79    ATTR_DEF *attrdef; /* Table of attribute definitions.
80                       Obtained from FILE_AttrDef. */
81
82#ifdef NTFS_RW
83    /* Variables used by the cluster and mft allocators. */
84    s64 mft_data_pos; /* Mft record number at which to
85                       allocate the next mft record. */
86    LCN mft_zone_start; /* First cluster of the mft zone. */
87    LCN mft_zone_end; /* First cluster beyond the mft zone. */
88    LCN mft_zone_pos; /* Current position in the mft zone. */
89    LCN data1_zone_pos; /* Current position in the first data
90                       zone. */
91    LCN data2_zone_pos; /* Current position in the second data
92                       zone. */
93#endif /* NTFS_RW */
94
95    struct inode *mft_ino; /* The VFS inode of $MFT. */
96
97    struct inode *mftbmp_ino; /* Attribute inode for $MFT/$BITMAP. */
98    struct rw_semaphore mftbmp_lock; /* Lock for serializing accesses to the
99                        mft record bitmap ($MFT/$BITMAP). */
100#ifdef NTFS_RW
101    struct inode *mftmirr_ino; /* The VFS inode of $MFTMirr. */
102    int mftmirr_size; /* Size of mft mirror in mft records. */
103
104    struct inode *logfile_ino; /* The VFS inode of $LogFile. */
105#endif /* NTFS_RW */
106
107    struct inode *lcnbmp_ino; /* The VFS inode of $Bitmap. */
108    struct rw_semaphore lcnbmp_lock; /* Lock for serializing accesses to the
109                        cluster bitmap ($Bitmap/$DATA). */
110
111    struct inode *vol_ino; /* The VFS inode of $Volume. */
112    VOLUME_FLAGS vol_flags; /* Volume flags. */
113    u8 major_ver; /* Ntfs major version of volume. */
114    u8 minor_ver; /* Ntfs minor version of volume. */
115
116    struct inode *root_ino; /* The VFS inode of the root
117                       directory. */
118    struct inode *secure_ino; /* The VFS inode of $Secure (NTFS3.0+
119                       only, otherwise NULL). */
120    struct inode *extend_ino; /* The VFS inode of $Extend (NTFS3.0+
121                       only, otherwise NULL). */
122#ifdef NTFS_RW
123    /* $Quota stuff is NTFS3.0+ specific. Unused/NULL otherwise. */
124    struct inode *quota_ino; /* The VFS inode of $Quota. */
125    struct inode *quota_q_ino; /* Attribute inode for $Quota/$Q. */
126    /* $UsnJrnl stuff is NTFS3.0+ specific. Unused/NULL otherwise. */
127    struct inode *usnjrnl_ino; /* The VFS inode of $UsnJrnl. */
128    struct inode *usnjrnl_max_ino; /* Attribute inode for $UsnJrnl/$Max. */
129    struct inode *usnjrnl_j_ino; /* Attribute inode for $UsnJrnl/$J. */
130#endif /* NTFS_RW */
131    struct nls_table *nls_map;
132} ntfs_volume;
133
134/*
135 * Defined bits for the flags field in the ntfs_volume structure.
136 */
137typedef enum {
138    NV_Errors, /* 1: Volume has errors, prevent remount rw. */
139    NV_ShowSystemFiles, /* 1: Return system files in ntfs_readdir(). */
140    NV_CaseSensitive, /* 1: Treat file names as case sensitive and
141                      create filenames in the POSIX namespace.
142                      Otherwise be case insensitive but still
143                      create file names in POSIX namespace. */
144    NV_LogFileEmpty, /* 1: $LogFile journal is empty. */
145    NV_QuotaOutOfDate, /* 1: $Quota is out of date. */
146    NV_UsnJrnlStamped, /* 1: $UsnJrnl has been stamped. */
147    NV_SparseEnabled, /* 1: May create sparse files. */
148} ntfs_volume_flags;
149
150/*
151 * Macro tricks to expand the NVolFoo(), NVolSetFoo(), and NVolClearFoo()
152 * functions.
153 */
154#define DEFINE_NVOL_BIT_OPS(flag) \
155static inline int NVol##flag(ntfs_volume *vol) \
156{ \
157    return test_bit(NV_##flag, &(vol)->flags); \
158} \
159static inline void NVolSet##flag(ntfs_volume *vol) \
160{ \
161    set_bit(NV_##flag, &(vol)->flags); \
162} \
163static inline void NVolClear##flag(ntfs_volume *vol) \
164{ \
165    clear_bit(NV_##flag, &(vol)->flags); \
166}
167
168/* Emit the ntfs volume bitops functions. */
169DEFINE_NVOL_BIT_OPS(Errors)
170DEFINE_NVOL_BIT_OPS(ShowSystemFiles)
171DEFINE_NVOL_BIT_OPS(CaseSensitive)
172DEFINE_NVOL_BIT_OPS(LogFileEmpty)
173DEFINE_NVOL_BIT_OPS(QuotaOutOfDate)
174DEFINE_NVOL_BIT_OPS(UsnJrnlStamped)
175DEFINE_NVOL_BIT_OPS(SparseEnabled)
176
177#endif /* _LINUX_NTFS_VOLUME_H */
178

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