2 * inode.h - Defines for inode structures NTFS Linux kernel driver. Part of
3 * the Linux-NTFS project.
5 * Copyright (c) 2001-2004 Anton Altaparmakov
6 * Copyright (c) 2002 Richard Russon
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.
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.
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
24 #ifndef _LINUX_NTFS_INODE_H
25 #define _LINUX_NTFS_INODE_H
29 #include <linux/seq_file.h>
30 #include <linux/list.h>
31 #include <asm/atomic.h>
32 #include <asm/semaphore.h>
40 typedef struct _ntfs_inode ntfs_inode;
43 * The NTFS in-memory inode structure. It is just used as an extension to the
44 * fields already provided in the VFS inode.
47 rwlock_t size_lock; /* Lock serializing access to inode sizes. */
48 s64 initialized_size; /* Copy from the attribute record. */
49 s64 allocated_size; /* Copy from the attribute record. */
50 unsigned long state; /* NTFS specific flags describing this inode.
51 See ntfs_inode_state_bits below. */
52 unsigned long mft_no; /* Number of the mft record / inode. */
53 u16 seq_no; /* Sequence number of the mft record. */
54 atomic_t count; /* Inode reference count for book keeping. */
55 ntfs_volume *vol; /* Pointer to the ntfs volume of this inode. */
57 * If NInoAttr() is true, the below fields describe the attribute which
58 * this fake inode belongs to. The actual inode of this attribute is
59 * pointed to by base_ntfs_ino and nr_extents is always set to -1 (see
60 * below). For real inodes, we also set the type (AT_DATA for files and
61 * AT_INDEX_ALLOCATION for directories), with the name = NULL and
62 * name_len = 0 for files and name = I30 (global constant) and
63 * name_len = 4 for directories.
65 ATTR_TYPE type; /* Attribute type of this fake inode. */
66 ntfschar *name; /* Attribute name of this fake inode. */
67 u32 name_len; /* Attribute name length of this fake inode. */
68 runlist runlist; /* If state has the NI_NonResident bit set,
69 the runlist of the unnamed data attribute
70 (if a file) or of the index allocation
71 attribute (directory) or of the attribute
72 described by the fake inode (if NInoAttr()).
73 If runlist.rl is NULL, the runlist has not
74 been read in yet or has been unmapped. If
75 NI_NonResident is clear, the attribute is
76 resident (file and fake inode) or there is
77 no $I30 index allocation attribute
78 (small directory). In the latter case
79 runlist.rl is always NULL.*/
81 * The following fields are only valid for real inodes and extent
84 struct semaphore mrec_lock; /* Lock for serializing access to the
85 mft record belonging to this inode. */
86 struct page *page; /* The page containing the mft record of the
87 inode. This should only be touched by the
88 (un)map_mft_record*() functions. */
89 int page_ofs; /* Offset into the page at which the mft record
90 begins. This should only be touched by the
91 (un)map_mft_record*() functions. */
93 * Attribute list support (only for use by the attribute lookup
94 * functions). Setup during read_inode for all inodes with attribute
95 * lists. Only valid if NI_AttrList is set in state, and attr_list_rl is
96 * further only valid if NI_AttrListNonResident is set.
98 u32 attr_list_size; /* Length of attribute list value in bytes. */
99 u8 *attr_list; /* Attribute list value itself. */
100 runlist attr_list_rl; /* Run list for the attribute list value. */
102 struct { /* It is a directory, $MFT, or an index inode. */
103 struct inode *bmp_ino; /* Attribute inode for the
105 u32 block_size; /* Size of an index block. */
106 u32 vcn_size; /* Size of a vcn in this
108 COLLATION_RULE collation_rule; /* The collation rule
110 u8 block_size_bits; /* Log2 of the above. */
111 u8 vcn_size_bits; /* Log2 of the above. */
113 struct { /* It is a compressed file or an attribute inode. */
114 s64 size; /* Copy of compressed_size from
116 u32 block_size; /* Size of a compression block
118 u8 block_size_bits; /* Log2 of the size of a cb. */
119 u8 block_clusters; /* Number of clusters per cb. */
122 struct semaphore extent_lock; /* Lock for accessing/modifying the
124 s32 nr_extents; /* For a base mft record, the number of attached extent
125 inodes (0 if none), for extent records and for fake
126 inodes describing an attribute this is -1. */
127 union { /* This union is only used if nr_extents != 0. */
128 ntfs_inode **extent_ntfs_inos; /* For nr_extents > 0, array of
129 the ntfs inodes of the extent
130 mft records belonging to
131 this base inode which have
133 ntfs_inode *base_ntfs_ino; /* For nr_extents == -1, the
134 ntfs inode of the base mft
135 record. For fake inodes, the
136 real (base) inode to which
137 the attribute belongs. */
142 * Defined bits for the state field in the ntfs_inode structure.
143 * (f) = files only, (d) = directories only, (a) = attributes/fake inodes only
146 NI_Dirty, /* 1: Mft record needs to be written to disk. */
147 NI_AttrList, /* 1: Mft record contains an attribute list. */
148 NI_AttrListNonResident, /* 1: Attribute list is non-resident. Implies
149 NI_AttrList is set. */
151 NI_Attr, /* 1: Fake inode for attribute i/o.
152 0: Real inode or extent inode. */
154 NI_MstProtected, /* 1: Attribute is protected by MST fixups.
155 0: Attribute is not protected by fixups. */
156 NI_NonResident, /* 1: Unnamed data attr is non-resident (f).
157 1: Attribute is non-resident (a). */
158 NI_IndexAllocPresent = NI_NonResident, /* 1: $I30 index alloc attr is
160 NI_Compressed, /* 1: Unnamed data attr is compressed (f).
161 1: Create compressed files by default (d).
162 1: Attribute is compressed (a). */
163 NI_Encrypted, /* 1: Unnamed data attr is encrypted (f).
164 1: Create encrypted files by default (d).
165 1: Attribute is encrypted (a). */
166 NI_Sparse, /* 1: Unnamed data attr is sparse (f).
167 1: Create sparse files by default (d).
168 1: Attribute is sparse (a). */
169 NI_TruncateFailed, /* 1: Last ntfs_truncate() call failed. */
170 } ntfs_inode_state_bits;
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.
179 * Macro tricks to expand the NInoFoo(), NInoSetFoo(), and NInoClearFoo()
182 #define NINO_FNS(flag) \
183 static inline int NIno##flag(ntfs_inode *ni) \
185 return test_bit(NI_##flag, &(ni)->state); \
187 static inline void NInoSet##flag(ntfs_inode *ni) \
189 set_bit(NI_##flag, &(ni)->state); \
191 static inline void NInoClear##flag(ntfs_inode *ni) \
193 clear_bit(NI_##flag, &(ni)->state); \
197 * As above for NInoTestSetFoo() and NInoTestClearFoo().
199 #define TAS_NINO_FNS(flag) \
200 static inline int NInoTestSet##flag(ntfs_inode *ni) \
202 return test_and_set_bit(NI_##flag, &(ni)->state); \
204 static inline int NInoTestClear##flag(ntfs_inode *ni) \
206 return test_and_clear_bit(NI_##flag, &(ni)->state); \
209 /* Emit the ntfs inode bitops functions. */
213 NINO_FNS(AttrListNonResident)
215 NINO_FNS(MstProtected)
216 NINO_FNS(NonResident)
217 NINO_FNS(IndexAllocPresent)
221 NINO_FNS(TruncateFailed)
224 * The full structure containing a ntfs_inode and a vfs struct inode. Used for
225 * all real and fake inodes but not for extent inodes which lack the vfs struct
229 ntfs_inode ntfs_inode;
230 struct inode vfs_inode; /* The vfs inode structure. */
234 * NTFS_I - return the ntfs inode given a vfs inode
237 * NTFS_I() returns the ntfs inode associated with the VFS @inode.
239 static inline ntfs_inode *NTFS_I(struct inode *inode)
241 return (ntfs_inode *)list_entry(inode, big_ntfs_inode, vfs_inode);
244 static inline struct inode *VFS_I(ntfs_inode *ni)
246 return &((big_ntfs_inode *)ni)->vfs_inode;
250 * ntfs_attr - ntfs in memory attribute structure
251 * @mft_no: mft record number of the base mft record of this attribute
252 * @name: Unicode name of the attribute (NULL if unnamed)
253 * @name_len: length of @name in Unicode characters (0 if unnamed)
254 * @type: attribute type (see layout.h)
256 * This structure exists only to provide a small structure for the
257 * ntfs_{attr_}iget()/ntfs_test_inode()/ntfs_init_locked_inode() mechanism.
259 * NOTE: Elements are ordered by size to make the structure as compact as
260 * possible on all architectures.
263 unsigned long mft_no;
269 typedef int (*test_t)(struct inode *, void *);
271 extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
273 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
274 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
275 ntfschar *name, u32 name_len);
276 extern struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
279 extern struct inode *ntfs_alloc_big_inode(struct super_block *sb);
280 extern void ntfs_destroy_big_inode(struct inode *inode);
281 extern void ntfs_clear_big_inode(struct inode *vi);
283 extern void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni);
285 static inline void ntfs_init_big_inode(struct inode *vi)
287 ntfs_inode *ni = NTFS_I(vi);
289 ntfs_debug("Entering.");
290 __ntfs_init_inode(vi->i_sb, ni);
291 ni->mft_no = vi->i_ino;
294 extern ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
295 unsigned long mft_no);
296 extern void ntfs_clear_extent_inode(ntfs_inode *ni);
298 extern int ntfs_read_inode_mount(struct inode *vi);
300 extern void ntfs_put_inode(struct inode *vi);
302 extern int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt);
306 extern int ntfs_truncate(struct inode *vi);
307 extern void ntfs_truncate_vfs(struct inode *vi);
309 extern int ntfs_setattr(struct dentry *dentry, struct iattr *attr);
311 extern int ntfs_write_inode(struct inode *vi, int sync);
313 static inline void ntfs_commit_inode(struct inode *vi)
315 if (!is_bad_inode(vi))
316 ntfs_write_inode(vi, 1);
322 #endif /* _LINUX_NTFS_INODE_H */