1 #ifndef _WIMLIB_INODE_H
2 #define _WIMLIB_INODE_H
4 #include "wimlib/assert.h"
5 #include "wimlib/list.h"
6 #include "wimlib/sha1.h"
7 #include "wimlib/types.h"
10 struct blob_descriptor;
13 struct wim_inode_extra;
14 struct wim_security_data;
17 /* Valid values for the 'stream_type' field of a 'struct wim_inode_stream' */
18 enum wim_inode_stream_type {
20 /* Data stream, may be unnamed (usual case) or named */
23 /* Reparse point stream. This is the same as the data of the on-disk
24 * reparse point attribute, except that the first 8 bytes of the on-disk
25 * attribute are omitted. The omitted bytes contain the reparse tag
26 * (which is instead stored in the on-disk WIM dentry), the reparse data
27 * size (which is redundant with the stream size), and a reserved field
28 * that is always zero. */
29 STREAM_TYPE_REPARSE_POINT,
31 /* Encrypted data in the "EFSRPC raw data format" specified by [MS-EFSR]
32 * section 2.2.3. This contains metadata for the Encrypting File System
33 * as well as the encrypted data of all the file's data streams. */
34 STREAM_TYPE_EFSRPC_RAW_DATA,
36 /* Stream type could not be determined */
40 extern const utf16lechar NO_STREAM_NAME[1];
43 * 'struct wim_inode_stream' describes a "stream", which associates a blob of
44 * data with an inode. Each stream has a type and optionally a name.
46 * The most frequently seen kind of stream is the "unnamed data stream"
47 * (stream_type == STREAM_TYPE_DATA && stream_name == NO_STREAM_NAME), which is
48 * the "default file contents". Many inodes just have an unnamed data stream
49 * and no other streams. However, files on NTFS filesystems may have
50 * additional, "named" data streams, and this is supported by the WIM format.
52 * A "reparse point" is an inode with reparse data set. The reparse data is
53 * stored in a stream of type STREAM_TYPE_REPARSE_POINT. There should be only
54 * one such stream, and it should be unnamed. However, it is possible for an
55 * inode to have both a reparse point stream and an unnamed data stream, and
56 * even named data streams as well.
58 struct wim_inode_stream {
60 /* The name of the stream or NO_STREAM_NAME. */
61 utf16lechar *stream_name;
64 * If 'stream_resolved' = 0, then 'stream_hash' is the SHA-1 message
65 * digest of the uncompressed data of this stream, or all zeroes if this
68 * If 'stream_resolved' = 1, then 'stream_blob' is a pointer directly to
69 * a descriptor for this stream's blob, or NULL if this stream is empty.
72 u8 _stream_hash[SHA1_HASH_SIZE];
73 struct blob_descriptor *_stream_blob;
74 } _packed_attribute; /* union is SHA1_HASH_SIZE bytes */
76 /* 'stream_resolved' determines whether 'stream_hash' or 'stream_blob'
77 * is valid as described above. */
78 u32 stream_resolved : 1;
80 /* A unique identifier for this stream within the context of its inode.
81 * This stays constant even if the streams array is reallocated. */
84 /* The type of this stream as one of the STREAM_TYPE_* values */
89 * WIM inode - a "file" in an image which may be accessible via multiple paths
91 * Note: in WIM files there is no true on-disk analogue of an inode; there are
92 * only directory entries, and some fields are duplicated among all links to a
93 * file. However, wimlib uses inode structures internally to simplify handling
99 * The collection of streams for this inode. 'i_streams' points to
100 * either 'i_embedded_streams' or an allocated array.
102 struct wim_inode_stream *i_streams;
103 struct wim_inode_stream i_embedded_streams[1];
104 unsigned i_num_streams;
106 /* Windows file attribute flags (FILE_ATTRIBUTE_*). */
109 /* Root of a balanced binary search tree storing the child directory
110 * entries of this inode, if any. Keyed by wim_dentry->d_name, case
111 * sensitively. If this inode is not a directory or if it has no
112 * children then this will be an empty tree (NULL). */
113 struct avl_tree_node *i_children;
115 /* Root of a balanced binary search tree storing the child directory
116 * entries of this inode, if any. Keyed by wim_dentry->d_name, case
117 * insensitively. If this inode is not a directory or if it has no
118 * children then this will be an empty tree (NULL). */
119 struct avl_tree_node *i_children_ci;
121 /* List of dentries that are aliases for this inode. There will be
122 * i_nlink dentries in this list. */
123 struct hlist_head i_alias_list;
125 /* Field to place this inode into a list. While reading a WIM image or
126 * adding files to a WIM image this is owned by the inode table;
127 * otherwise this links the inodes for the WIM image. */
128 struct hlist_node i_hlist_node;
130 /* Number of dentries that are aliases for this inode. */
133 /* Flag used by some code to mark this inode as visited. It will be 0
134 * by default, and it always must be cleared after use. */
138 u32 i_can_externally_back : 1;
140 /* If not NULL, a pointer to the extra data that was read from the
141 * dentry. This should be a series of tagged items, each of which
142 * represents a bit of extra metadata, such as the file's object ID.
143 * See tagged_items.c for more information. */
144 struct wim_inode_extra *i_extra;
146 /* Creation time, last access time, and last write time for this inode,
147 * in 100-nanosecond intervals since 12:00 a.m UTC January 1, 1601.
148 * They should correspond to the times gotten by calling GetFileTime()
151 u64 i_last_access_time;
152 u64 i_last_write_time;
154 /* Corresponds to 'security_id' in `struct wim_dentry_on_disk': The
155 * index of this inode's security descriptor in the WIM image's table of
156 * security descriptors, or -1 if this inode does not have a security
160 /* Unknown field that we only read into memory so we can re-write it
161 * unchanged. Probably it's actually just padding... */
164 /* The following fields correspond to 'reparse_tag', 'rp_reserved', and
165 * 'rp_flags' in `struct wim_dentry_on_disk'. They are only meaningful
166 * for reparse point files. */
171 /* Inode number; corresponds to hard_link_group_id in the `struct
172 * wim_dentry_on_disk'. */
176 /* Device number, used only during image capture, so we can
177 * identify hard linked files by the combination of inode number
178 * and device number (rather than just inode number, which could
179 * be ambiguous if the captured tree spans a mountpoint). Set
183 /* Fields used only during extraction */
185 /* A singly linked list of aliases of this inode that
186 * are being extracted in the current extraction
187 * operation. This list may be shorter than the inode's
188 * full alias list. This list will be constructed
189 * regardless of whether the extraction backend supports
190 * hard links or not. */
191 struct wim_dentry *i_first_extraction_alias;
194 /* In NTFS-3G extraction mode, this is set to the Master
195 * File Table (MFT) number of the NTFS file that was
196 * created for this inode. */
201 /* Used during WIM writing with
202 * WIMLIB_WRITE_FLAG_SEND_DONE_WITH_FILE_MESSAGES: the number
203 * of streams this inode has that have not yet been fully read.
205 u32 i_num_remaining_streams;
209 /* Used only during image mount: Table of file
210 * descriptors that have been opened to this inode.
211 * This table is freed when the last file descriptor is
213 struct wimfs_fd **i_fds;
215 /* Lower bound on the index of the next available entry
223 u16 i_num_opened_fds;
224 u16 i_num_allocated_fds;
227 /* Next stream ID to be assigned */
228 u32 i_next_stream_id;
231 /* Optional extra data for a WIM inode */
232 struct wim_inode_extra {
233 size_t size; /* Size of the extra data in bytes */
234 u8 data[]; /* The extra data */
238 * The available reparse tags are documented at
239 * http://msdn.microsoft.com/en-us/library/dd541667(v=prot.10).aspx.
240 * Here we only define the ones of interest to us.
242 #define WIM_IO_REPARSE_TAG_MOUNT_POINT 0xA0000003
243 #define WIM_IO_REPARSE_TAG_SYMLINK 0xA000000C
244 #define WIM_IO_REPARSE_TAG_WOF 0x80000017
246 /* Flags for the rp_flags field. Currently the only known flag is NOT_FIXED,
247 * which indicates that the target of the absolute symbolic link or junction was
248 * not changed when it was stored. */
249 #define WIM_RP_FLAG_NOT_FIXED 0x0001
251 /* Windows file attribute flags */
252 #define FILE_ATTRIBUTE_READONLY 0x00000001
253 #define FILE_ATTRIBUTE_HIDDEN 0x00000002
254 #define FILE_ATTRIBUTE_SYSTEM 0x00000004
255 #define FILE_ATTRIBUTE_DIRECTORY 0x00000010
256 #define FILE_ATTRIBUTE_ARCHIVE 0x00000020
257 #define FILE_ATTRIBUTE_DEVICE 0x00000040
258 #define FILE_ATTRIBUTE_NORMAL 0x00000080
259 #define FILE_ATTRIBUTE_TEMPORARY 0x00000100
260 #define FILE_ATTRIBUTE_SPARSE_FILE 0x00000200
261 #define FILE_ATTRIBUTE_REPARSE_POINT 0x00000400
262 #define FILE_ATTRIBUTE_COMPRESSED 0x00000800
263 #define FILE_ATTRIBUTE_OFFLINE 0x00001000
264 #define FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 0x00002000
265 #define FILE_ATTRIBUTE_ENCRYPTED 0x00004000
266 #define FILE_ATTRIBUTE_VIRTUAL 0x00010000
268 extern struct wim_inode *
269 new_inode(struct wim_dentry *dentry, bool set_timestamps);
271 /* Iterate through each alias of the specified inode. */
272 #define inode_for_each_dentry(dentry, inode) \
273 hlist_for_each_entry((dentry), &(inode)->i_alias_list, d_alias_node)
275 /* Return an alias of the specified inode. */
276 #define inode_any_dentry(inode) \
277 hlist_entry(inode->i_alias_list.first, struct wim_dentry, d_alias_node)
279 /* Return the full path of an alias of the specified inode, or NULL if a full
280 * path could not be determined. */
281 #define inode_any_full_path(inode) \
282 dentry_full_path(inode_any_dentry(inode))
285 d_associate(struct wim_dentry *dentry, struct wim_inode *inode);
288 d_disassociate(struct wim_dentry *dentry);
292 inode_dec_num_opened_fds(struct wim_inode *inode);
295 /* Is the inode a directory?
296 * This doesn't count directories with reparse data.
297 * wimlib only allows inodes of this type to have children.
300 inode_is_directory(const struct wim_inode *inode)
302 return (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
303 FILE_ATTRIBUTE_REPARSE_POINT))
304 == FILE_ATTRIBUTE_DIRECTORY;
307 /* Is the inode a symbolic link?
308 * This returns true iff the inode is a reparse point that is either a "real"
309 * symbolic link or a junction point. */
311 inode_is_symlink(const struct wim_inode *inode)
313 return (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)
314 && (inode->i_reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
315 inode->i_reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT);
318 /* Does the inode have children? Currently (based on read_dentry_tree() as well
319 * as the various build-dentry-tree implementations), this can only return true
320 * for inodes for which inode_is_directory() returns true. */
322 inode_has_children(const struct wim_inode *inode)
324 return inode->i_children != NULL;
327 /* Does the inode have a security descriptor? */
329 inode_has_security_descriptor(const struct wim_inode *inode)
331 return inode->i_security_id >= 0;
334 extern struct wim_inode_stream *
335 inode_get_stream(const struct wim_inode *inode, int stream_type,
336 const utf16lechar *stream_name);
338 extern struct wim_inode_stream *
339 inode_get_unnamed_stream(const struct wim_inode *inode, int stream_type);
341 static inline struct wim_inode_stream *
342 inode_get_unnamed_data_stream(const struct wim_inode *inode)
344 return inode_get_unnamed_stream(inode, STREAM_TYPE_DATA);
347 extern struct wim_inode_stream *
348 inode_add_stream(struct wim_inode *inode, int stream_type,
349 const utf16lechar *stream_name, struct blob_descriptor *blob);
352 inode_replace_stream_blob(struct wim_inode *inode,
353 struct wim_inode_stream *strm,
354 struct blob_descriptor *new_blob,
355 struct blob_table *blob_table);
358 inode_replace_stream_data(struct wim_inode *inode,
359 struct wim_inode_stream *strm,
360 const void *data, size_t size,
361 struct blob_table *blob_table);
364 inode_add_stream_with_data(struct wim_inode *inode,
365 int stream_type, const utf16lechar *stream_name,
366 const void *data, size_t size,
367 struct blob_table *blob_table);
370 inode_remove_stream(struct wim_inode *inode, struct wim_inode_stream *strm,
371 struct blob_table *blob_table);
373 static inline struct blob_descriptor *
374 stream_blob_resolved(const struct wim_inode_stream *strm)
376 wimlib_assert(strm->stream_resolved);
377 return strm->_stream_blob;
381 stream_is_named(const struct wim_inode_stream *strm)
383 return strm->stream_name != NO_STREAM_NAME;
387 stream_is_unnamed_data_stream(const struct wim_inode_stream *strm)
389 return strm->stream_type == STREAM_TYPE_DATA && !stream_is_named(strm);
393 stream_is_named_data_stream(const struct wim_inode_stream *strm)
395 return strm->stream_type == STREAM_TYPE_DATA && stream_is_named(strm);
399 inode_has_named_data_stream(const struct wim_inode *inode);
402 inode_resolve_streams(struct wim_inode *inode, struct blob_table *table,
406 blob_not_found_error(const struct wim_inode *inode, const u8 *hash);
408 extern struct blob_descriptor *
409 stream_blob(const struct wim_inode_stream *strm, const struct blob_table *table);
411 extern struct blob_descriptor *
412 inode_get_blob_for_unnamed_data_stream(const struct wim_inode *inode,
413 const struct blob_table *blob_table);
415 extern struct blob_descriptor *
416 inode_get_blob_for_unnamed_data_stream_resolved(const struct wim_inode *inode);
419 stream_hash(const struct wim_inode_stream *strm);
422 inode_get_hash_of_unnamed_data_stream(const struct wim_inode *inode);
425 inode_ref_blobs(struct wim_inode *inode);
428 inode_unref_blobs(struct wim_inode *inode, struct blob_table *blob_table);
432 dentry_tree_fix_inodes(struct wim_dentry *root, struct hlist_head *inode_list);
434 #endif /* _WIMLIB_INODE_H */