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
41 typedef 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 */
47 struct _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 */
144 typedef 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) \
183 static inline int NIno##flag(ntfs_inode *ni) \
184 { \
185 return test_bit(NI_##flag, &(ni)->state); \
186 } \
187 static inline void NInoSet##flag(ntfs_inode *ni) \
188 { \
189 set_bit(NI_##flag, &(ni)->state); \
190 } \
191 static 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) \
200 static inline int NInoTestSet##flag(ntfs_inode *ni) \
201 { \
202 return test_and_set_bit(NI_##flag, &(ni)->state); \
203 } \
204 static 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. */
210 NINO_FNS(Dirty)
211 TAS_NINO_FNS(Dirty)
212 NINO_FNS(AttrList)
213 NINO_FNS(AttrListNonResident)
214 NINO_FNS(Attr)
215 NINO_FNS(MstProtected)
216 NINO_FNS(NonResident)
217 NINO_FNS(IndexAllocPresent)
218 NINO_FNS(Compressed)
219 NINO_FNS(Encrypted)
220 NINO_FNS(Sparse)
221 NINO_FNS(SparseDisabled)
222 NINO_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 */
229 typedef 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 */
NTFS_I(struct inode * inode)240 static inline ntfs_inode *NTFS_I(struct inode *inode)
241 {
242 return (ntfs_inode *)list_entry(inode, big_ntfs_inode, vfs_inode);
243 }
244
VFS_I(ntfs_inode * ni)245 static 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 */
263 typedef struct {
264 unsigned long mft_no;
265 ntfschar *name;
266 u32 name_len;
267 ATTR_TYPE type;
268 } ntfs_attr;
269
270 typedef int (*test_t)(struct inode *, void *);
271
272 extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
273
274 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
275 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
276 ntfschar *name, u32 name_len);
277 extern struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
278 u32 name_len);
279
280 extern struct inode *ntfs_alloc_big_inode(struct super_block *sb);
281 extern void ntfs_destroy_big_inode(struct inode *inode);
282 extern void ntfs_evict_big_inode(struct inode *vi);
283
284 extern void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni);
285
ntfs_init_big_inode(struct inode * vi)286 static 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
295 extern ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
296 unsigned long mft_no);
297 extern void ntfs_clear_extent_inode(ntfs_inode *ni);
298
299 extern int ntfs_read_inode_mount(struct inode *vi);
300
301 extern int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt);
302
303 #ifdef NTFS_RW
304
305 extern int ntfs_truncate(struct inode *vi);
306 extern void ntfs_truncate_vfs(struct inode *vi);
307
308 extern int ntfs_setattr(struct dentry *dentry, struct iattr *attr);
309
310 extern int __ntfs_write_inode(struct inode *vi, int sync);
311
ntfs_commit_inode(struct inode * vi)312 static 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