Root/fs/ntfs/inode.h

1/*
2 * inode.h - Defines for inode structures NTFS Linux kernel driver. Part of
3 * the Linux-NTFS project.
4 *
5 * Copyright (c) 2001-2007 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_INODE_H
25#define _LINUX_NTFS_INODE_H
26
27#include <asm/atomic.h>
28
29#include <linux/fs.h>
30#include <linux/list.h>
31#include <linux/mm.h>
32#include <linux/mutex.h>
33#include <linux/seq_file.h>
34
35#include "layout.h"
36#include "volume.h"
37#include "types.h"
38#include "runlist.h"
39#include "debug.h"
40
41typedef struct _ntfs_inode ntfs_inode;
42
43/*
44 * The NTFS in-memory inode structure. It is just used as an extension to the
45 * fields already provided in the VFS inode.
46 */
47struct _ntfs_inode {
48    rwlock_t size_lock; /* Lock serializing access to inode sizes. */
49    s64 initialized_size; /* Copy from the attribute record. */
50    s64 allocated_size; /* Copy from the attribute record. */
51    unsigned long state; /* NTFS specific flags describing this inode.
52                   See ntfs_inode_state_bits below. */
53    unsigned long mft_no; /* Number of the mft record / inode. */
54    u16 seq_no; /* Sequence number of the mft record. */
55    atomic_t count; /* Inode reference count for book keeping. */
56    ntfs_volume *vol; /* Pointer to the ntfs volume of this inode. */
57    /*
58     * If NInoAttr() is true, the below fields describe the attribute which
59     * this fake inode belongs to. The actual inode of this attribute is
60     * pointed to by base_ntfs_ino and nr_extents is always set to -1 (see
61     * below). For real inodes, we also set the type (AT_DATA for files and
62     * AT_INDEX_ALLOCATION for directories), with the name = NULL and
63     * name_len = 0 for files and name = I30 (global constant) and
64     * name_len = 4 for directories.
65     */
66    ATTR_TYPE type; /* Attribute type of this fake inode. */
67    ntfschar *name; /* Attribute name of this fake inode. */
68    u32 name_len; /* Attribute name length of this fake inode. */
69    runlist runlist; /* If state has the NI_NonResident bit set,
70                   the runlist of the unnamed data attribute
71                   (if a file) or of the index allocation
72                   attribute (directory) or of the attribute
73                   described by the fake inode (if NInoAttr()).
74                   If runlist.rl is NULL, the runlist has not
75                   been read in yet or has been unmapped. If
76                   NI_NonResident is clear, the attribute is
77                   resident (file and fake inode) or there is
78                   no $I30 index allocation attribute
79                   (small directory). In the latter case
80                   runlist.rl is always NULL.*/
81    /*
82     * The following fields are only valid for real inodes and extent
83     * inodes.
84     */
85    struct mutex mrec_lock; /* Lock for serializing access to the
86                   mft record belonging to this inode. */
87    struct page *page; /* The page containing the mft record of the
88                   inode. This should only be touched by the
89                   (un)map_mft_record*() functions. */
90    int page_ofs; /* Offset into the page at which the mft record
91                   begins. This should only be touched by the
92                   (un)map_mft_record*() functions. */
93    /*
94     * Attribute list support (only for use by the attribute lookup
95     * functions). Setup during read_inode for all inodes with attribute
96     * lists. Only valid if NI_AttrList is set in state, and attr_list_rl is
97     * further only valid if NI_AttrListNonResident is set.
98     */
99    u32 attr_list_size; /* Length of attribute list value in bytes. */
100    u8 *attr_list; /* Attribute list value itself. */
101    runlist attr_list_rl; /* Run list for the attribute list value. */
102    union {
103        struct { /* It is a directory, $MFT, or an index inode. */
104            u32 block_size; /* Size of an index block. */
105            u32 vcn_size; /* Size of a vcn in this
106                           index. */
107            COLLATION_RULE collation_rule; /* The collation rule
108                           for the index. */
109            u8 block_size_bits; /* Log2 of the above. */
110            u8 vcn_size_bits; /* Log2 of the above. */
111        } index;
112        struct { /* It is a compressed/sparse file/attribute inode. */
113            s64 size; /* Copy of compressed_size from
114                           $DATA. */
115            u32 block_size; /* Size of a compression block
116                           (cb). */
117            u8 block_size_bits; /* Log2 of the size of a cb. */
118            u8 block_clusters; /* Number of clusters per cb. */
119        } compressed;
120    } itype;
121    struct mutex extent_lock; /* Lock for accessing/modifying the
122                       below . */
123    s32 nr_extents; /* For a base mft record, the number of attached extent
124               inodes (0 if none), for extent records and for fake
125               inodes describing an attribute this is -1. */
126    union { /* This union is only used if nr_extents != 0. */
127        ntfs_inode **extent_ntfs_inos; /* For nr_extents > 0, array of
128                           the ntfs inodes of the extent
129                           mft records belonging to
130                           this base inode which have
131                           been loaded. */
132        ntfs_inode *base_ntfs_ino; /* For nr_extents == -1, the
133                           ntfs inode of the base mft
134                           record. For fake inodes, the
135                           real (base) inode to which
136                           the attribute belongs. */
137    } ext;
138};
139
140/*
141 * Defined bits for the state field in the ntfs_inode structure.
142 * (f) = files only, (d) = directories only, (a) = attributes/fake inodes only
143 */
144typedef enum {
145    NI_Dirty, /* 1: Mft record needs to be written to disk. */
146    NI_AttrList, /* 1: Mft record contains an attribute list. */
147    NI_AttrListNonResident, /* 1: Attribute list is non-resident. Implies
148                      NI_AttrList is set. */
149
150    NI_Attr, /* 1: Fake inode for attribute i/o.
151                   0: Real inode or extent inode. */
152
153    NI_MstProtected, /* 1: Attribute is protected by MST fixups.
154                   0: Attribute is not protected by fixups. */
155    NI_NonResident, /* 1: Unnamed data attr is non-resident (f).
156                   1: Attribute is non-resident (a). */
157    NI_IndexAllocPresent = NI_NonResident, /* 1: $I30 index alloc attr is
158                           present (d). */
159    NI_Compressed, /* 1: Unnamed data attr is compressed (f).
160                   1: Create compressed files by default (d).
161                   1: Attribute is compressed (a). */
162    NI_Encrypted, /* 1: Unnamed data attr is encrypted (f).
163                   1: Create encrypted files by default (d).
164                   1: Attribute is encrypted (a). */
165    NI_Sparse, /* 1: Unnamed data attr is sparse (f).
166                   1: Create sparse files by default (d).
167                   1: Attribute is sparse (a). */
168    NI_SparseDisabled, /* 1: May not create sparse regions. */
169    NI_TruncateFailed, /* 1: Last ntfs_truncate() call failed. */
170} ntfs_inode_state_bits;
171
172/*
173 * NOTE: We should be adding dirty mft records to a list somewhere and they
174 * should be independent of the (ntfs/vfs) inode structure so that an inode can
175 * be removed but the record can be left dirty for syncing later.
176 */
177
178/*
179 * Macro tricks to expand the NInoFoo(), NInoSetFoo(), and NInoClearFoo()
180 * functions.
181 */
182#define NINO_FNS(flag) \
183static inline int NIno##flag(ntfs_inode *ni) \
184{ \
185    return test_bit(NI_##flag, &(ni)->state); \
186} \
187static inline void NInoSet##flag(ntfs_inode *ni) \
188{ \
189    set_bit(NI_##flag, &(ni)->state); \
190} \
191static inline void NInoClear##flag(ntfs_inode *ni) \
192{ \
193    clear_bit(NI_##flag, &(ni)->state); \
194}
195
196/*
197 * As above for NInoTestSetFoo() and NInoTestClearFoo().
198 */
199#define TAS_NINO_FNS(flag) \
200static inline int NInoTestSet##flag(ntfs_inode *ni) \
201{ \
202    return test_and_set_bit(NI_##flag, &(ni)->state); \
203} \
204static inline int NInoTestClear##flag(ntfs_inode *ni) \
205{ \
206    return test_and_clear_bit(NI_##flag, &(ni)->state); \
207}
208
209/* Emit the ntfs inode bitops functions. */
210NINO_FNS(Dirty)
211TAS_NINO_FNS(Dirty)
212NINO_FNS(AttrList)
213NINO_FNS(AttrListNonResident)
214NINO_FNS(Attr)
215NINO_FNS(MstProtected)
216NINO_FNS(NonResident)
217NINO_FNS(IndexAllocPresent)
218NINO_FNS(Compressed)
219NINO_FNS(Encrypted)
220NINO_FNS(Sparse)
221NINO_FNS(SparseDisabled)
222NINO_FNS(TruncateFailed)
223
224/*
225 * The full structure containing a ntfs_inode and a vfs struct inode. Used for
226 * all real and fake inodes but not for extent inodes which lack the vfs struct
227 * inode.
228 */
229typedef struct {
230    ntfs_inode ntfs_inode;
231    struct inode vfs_inode; /* The vfs inode structure. */
232} big_ntfs_inode;
233
234/**
235 * NTFS_I - return the ntfs inode given a vfs inode
236 * @inode: VFS inode
237 *
238 * NTFS_I() returns the ntfs inode associated with the VFS @inode.
239 */
240static inline ntfs_inode *NTFS_I(struct inode *inode)
241{
242    return (ntfs_inode *)list_entry(inode, big_ntfs_inode, vfs_inode);
243}
244
245static inline struct inode *VFS_I(ntfs_inode *ni)
246{
247    return &((big_ntfs_inode *)ni)->vfs_inode;
248}
249
250/**
251 * ntfs_attr - ntfs in memory attribute structure
252 * @mft_no: mft record number of the base mft record of this attribute
253 * @name: Unicode name of the attribute (NULL if unnamed)
254 * @name_len: length of @name in Unicode characters (0 if unnamed)
255 * @type: attribute type (see layout.h)
256 *
257 * This structure exists only to provide a small structure for the
258 * ntfs_{attr_}iget()/ntfs_test_inode()/ntfs_init_locked_inode() mechanism.
259 *
260 * NOTE: Elements are ordered by size to make the structure as compact as
261 * possible on all architectures.
262 */
263typedef struct {
264    unsigned long mft_no;
265    ntfschar *name;
266    u32 name_len;
267    ATTR_TYPE type;
268} ntfs_attr;
269
270typedef int (*test_t)(struct inode *, void *);
271
272extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
273
274extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
275extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
276        ntfschar *name, u32 name_len);
277extern struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
278        u32 name_len);
279
280extern struct inode *ntfs_alloc_big_inode(struct super_block *sb);
281extern void ntfs_destroy_big_inode(struct inode *inode);
282extern void ntfs_evict_big_inode(struct inode *vi);
283
284extern void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni);
285
286static inline void ntfs_init_big_inode(struct inode *vi)
287{
288    ntfs_inode *ni = NTFS_I(vi);
289
290    ntfs_debug("Entering.");
291    __ntfs_init_inode(vi->i_sb, ni);
292    ni->mft_no = vi->i_ino;
293}
294
295extern ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
296        unsigned long mft_no);
297extern void ntfs_clear_extent_inode(ntfs_inode *ni);
298
299extern int ntfs_read_inode_mount(struct inode *vi);
300
301extern int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt);
302
303#ifdef NTFS_RW
304
305extern int ntfs_truncate(struct inode *vi);
306extern void ntfs_truncate_vfs(struct inode *vi);
307
308extern int ntfs_setattr(struct dentry *dentry, struct iattr *attr);
309
310extern int __ntfs_write_inode(struct inode *vi, int sync);
311
312static inline void ntfs_commit_inode(struct inode *vi)
313{
314    if (!is_bad_inode(vi))
315        __ntfs_write_inode(vi, 1);
316    return;
317}
318
319#endif /* NTFS_RW */
320
321#endif /* _LINUX_NTFS_INODE_H */
322

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