* dentry_tree_fix_inodes() in hardlink.c).
*/
struct wim_dentry {
- /* The inode for this dentry */
+ /* Pointer to the inode for this dentry. This will contain some
+ * information that was factored out of the on-disk WIM dentry as common
+ * to all dentries in a hard link group. */
struct wim_inode *d_inode;
/* Node for the parent's red-black tree of child dentries, sorted by
* including the terminating null character. */
u32 full_path_nbytes;
- /* Does this dentry need to be extracted? */
+ /* For extraction operations, a subtree of dentries will have this flag
+ * set so we can keep track of which dentries still need to be
+ * extracted. Otherwise this will always be 0. */
u8 needs_extraction : 1;
+ /* For extraction operations, this flag will be set when a dentry in the
+ * tree being extracted is not being extracted for some reason (file
+ * type not supported by target filesystem or contains invalid
+ * characters). Otherwise this will always be 0. */
u8 not_extracted : 1;
- /* Only used during NTFS capture */
+ /* When capturing from a NTFS volume using NTFS-3g, this flag is set on
+ * dentries that were created from a filename in the WIN32 or WIN32+DOS
+ * namespaces rather than the POSIX namespace. Otherwise this will
+ * always be 0. */
u8 is_win32_name : 1;
- /* Set to 1 if an inode has multiple DOS names. */
+ /* When verifying the dentry tree after reading it into memory, this
+ * flag will be set on all dentries in a hard link group that have a
+ * nonempty DOS name except one. This is because it is supposed to be
+ * illegal (on NTFS, at least) for a single inode to have multiple DOS
+ * names. */
u8 dos_name_invalid : 1;
- /* Temporary list */
+ /* Temporary list field used to make lists of dentries in a few places.
+ * */
struct list_head tmp_list;
- /* List of dentries in the inode (hard link set) */
+ /* Linked list node that places this dentry in the list of aliases for
+ * its inode (d_inode) */
struct list_head d_alias;
/* The parent of this directory entry. */
struct wim_dentry *parent;
- /*
- * Size of directory entry on disk, in bytes. Typical size is around
- * 104 to 120 bytes.
- *
- * It is possible for the length field to be 0. This situation, which
- * is undocumented, indicates the end of a list of sibling nodes in a
- * directory. It also means the real length is 8, because the dentry
- * included only the length field, but that takes up 8 bytes.
- *
- * The length here includes the base directory entry on disk as well as
- * the long and short filenames. It does NOT include any alternate
- * stream entries that may follow the directory entry, even though the
- * size of those needs to be considered. The length SHOULD be 8-byte
- * aligned, although we don't require it to be. We do require the
- * length to be large enough to hold the file name(s) of the dentry;
- * additionally, a warning is issued if this field is larger than the
- * aligned size.
- */
+ /* 'length' and 'subdir_offset' are only used while reading and writing
+ * this dentry; see the corresponding field in
+ * `struct wim_dentry_on_disk' for explanation. */
u64 length;
-
- /* The offset, from the start of the uncompressed WIM metadata resource
- * for this image, of this dentry's child dentries. 0 if the directory
- * entry has no children, which is the case for regular files or reparse
- * points. */
u64 subdir_offset;
+ /* These correspond to the two unused fields in the on-disk WIM dentry;
+ * we read them into memory so we can write them unchanged. These
+ * fields are set to 0 on new dentries. */
u64 d_unused_1;
u64 d_unused_2;
- /* Pointer to the UTF-16LE short filename (malloc()ed buffer) */
+ /* Pointer to the UTF-16LE short filename (malloc()ed buffer), or NULL
+ * if this dentry has no short name. */
utf16lechar *short_name;
- /* Pointer to the UTF-16LE filename (malloc()ed buffer). */
+ /* Pointer to the UTF-16LE filename (malloc()ed buffer), or NULL if this
+ * dentry has no filename. */
utf16lechar *file_name;
- /* Full path of this dentry in the WIM */
+ /* Full path to this dentry in the WIM, in platform-dependent tchars
+ * that can be printed without conversion. By default this field will
+ * be NULL and will only be calculated on-demand by the
+ * calculate_dentry_full_path() or dentry_full_path() functions. */
tchar *_full_path;
- /* Actual name to extract this dentry as. */
+ /* (Extraction only) Actual name to extract this dentry as, along with
+ * its length in tchars excluding the NULL terminator. This usually
+ * will be the same as file_name, with the character encoding converted
+ * if needed. But if file_name contains characters not accepted on the
+ * current platform, then this may be set slightly differently from
+ * file_name. This will be either NULL or a malloc()ed buffer that may
+ * alias file_name. */
tchar *extraction_name;
size_t extraction_name_nchars;
- /* List head for building a list of dentries that contain a certain
- * stream. */
+ /* (Extraction only) List head for building a list of dentries that
+ * contain a certain stream. */
struct list_head extraction_stream_list;
};
/*
* WIM inode.
*
- * As mentioned above, in the WIM file that is no on-disk analogue of a real
- * inode, as most of these fields are duplicated in the dentries.
+ * As mentioned in the comment above `struct wim_dentry', in the WIM file that
+ * is no on-disk analogue of a real inode, as most of these fields are
+ * duplicated in the dentries. Instead, a `struct wim_inode' is something we
+ * create ourselves to simplify the handling of hard links.
*/
struct wim_inode {
- /* Timestamps for the inode. The timestamps are the number of
- * 100-nanosecond intervals that have elapsed since 12:00 A.M., January
- * 1st, 1601, UTC. This is the same format used in NTFS inodes. */
- u64 i_creation_time;
- u64 i_last_access_time;
- u64 i_last_write_time;
+ /* If i_resolved == 0:
+ * SHA1 message digest of the contents of the unnamed-data stream
+ * of this inode.
+ *
+ * If i_resolved == 1:
+ * Pointer to the lookup table entry for the unnamed data stream
+ * of this inode, or NULL.
+ *
+ * i_hash corresponds to the 'unnamed_stream_hash' field of the `struct
+ * wim_dentry_on_disk' and the additional caveats documented about that
+ * field apply here (for example, the quirks regarding all-zero hashes).
+ */
+ union {
+ u8 i_hash[SHA1_HASH_SIZE];
+ struct wim_lookup_table_entry *i_lte;
+ };
- /* The file attributes associated with this inode. This is a bitwise OR
- * of the FILE_ATTRIBUTE_* flags. */
+ /* Corresponds to the 'attributes' field of `struct wim_dentry_on_disk';
+ * bitwise OR of the FILE_ATTRIBUTE_* flags that give the attributes of
+ * this inode. */
u32 i_attributes;
- /* The index of the security descriptor in the WIM image's table of
- * security descriptors that contains this file's security information.
- * If -1, no security information exists for this file. */
- int32_t i_security_id;
+ /* Root of a red-black tree storing the child dentries of this inode, if
+ * any. Keyed by wim_dentry->file_name, case sensitively. */
+ struct rb_root i_children;
- /* %true iff the inode's lookup table entries has been resolved (i.e.
- * the @lte field is valid, but the @hash field is not valid)
- *
- * (This is not an on-disk field.) */
- u8 i_resolved : 1;
+#ifdef __WIN32__
+ /* Root of a red-black tree storing the children of this inode, if any.
+ * Keyed by wim_dentry->file_name, case insensitively. */
+ struct rb_root i_children_case_insensitive;
+#endif
- u8 i_visited : 1;
+ /* List of dentries that are aliases for this inode. There will be
+ * i_nlink dentries in this list. */
+ struct list_head i_dentry;
- /* Used only in NTFS-mode extraction */
- u8 i_dos_name_extracted : 1;
+ /* Field to place this inode into a list. */
+ union {
+ /* Hash list node- used in hardlink.c when the inodes are placed
+ * into a hash table keyed by inode number and optionally device
+ * number, in order to detect dentries that are aliases for the
+ * same inode. */
+ struct hlist_node i_hlist;
- /* Set to 0 if reparse point fixups have been done. Otherwise set to 1.
- *
- * Note: this actually may reflect the SYMBOLIC_LINK_RELATIVE flag. */
- u16 i_not_rpfixed;
+ /* Normal list node- used to connect all the inodes of a WIM image
+ * into a single linked list referenced from the
+ * `struct wim_image_metadata' for that image. */
+ struct list_head i_list;
+ };
+
+ /* Number of dentries that are aliases for this inode. */
+ u32 i_nlink;
/* Number of alternate data streams associated with this inode */
u16 i_num_ads;
- /* Unused/unknown fields that we just read into memory so we can
- * re-write them unchanged. */
- u32 i_rp_unknown_1;
- u16 i_rp_unknown_2;
+ /* Flag that indicates whether this inode's streams have been
+ * "resolved". By default, the inode starts as "unresolved", meaning
+ * that the i_hash field, along with the hash field of any associated
+ * wim_ads_entry's, are valid and should be used as keys in the WIM
+ * lookup table to find the associated `struct wim_lookup_table_entry'.
+ * But if the inode has been resolved, then each of these fields is
+ * replaced with a pointer directly to the appropriate `struct
+ * wim_lookup_table_entry', or NULL if the stream is empty. */
+ u8 i_resolved : 1;
- /* If i_resolved == 0:
- * SHA1 message digest of the contents of the unnamed-data stream
- * of this inode, or all zeroes if this inode has no unnamed data
- * stream, or optionally all zeroes if this inode has an empty
- * unnamed data stream.
- *
- * If i_resolved == 1:
- * Pointer to the lookup table entry for the unnamed data stream
- * of this inode, or NULL if this inode has no unnamed data stream,
- * or optionally all zeroes if this inode has an empty unnamed data
- * stream.
- */
- union {
- u8 i_hash[SHA1_HASH_SIZE];
- struct wim_lookup_table_entry *i_lte;
- };
+ /* Flag used to mark this inode as visited; this is used when visiting
+ * all the inodes in a dentry tree exactly once. It will be 0 by
+ * default and must be cleared following the tree traversal, even in
+ * error paths. */
+ u8 i_visited : 1;
+
+ /* For NTFS-3g extraction: Set after the DOS name for this inode has
+ * been extracted. */
+ u8 i_dos_name_extracted : 1;
+
+ /* Pointer to a malloc()ed array of i_num_ads alternate data stream
+ * entries for this inode. */
+ struct wim_ads_entry *i_ads_entries;
+
+ /* Creation time, last access time, and last write time for this inode, in
+ * 100-nanosecond intervals since 12:00 a.m UTC January 1, 1601. They
+ * should correspond to the times gotten by calling GetFileTime() on
+ * Windows. */
+ u64 i_creation_time;
+ u64 i_last_access_time;
+ u64 i_last_write_time;
+
+ /* Corresponds to 'security_id' in `struct wim_dentry_on_disk': The
+ * index of this inode's security descriptor in the WIM image's table of
+ * security descriptors, or -1. Note: in verify_inode(), called
+ * whenever a WIM image is loaded, out-of-bounds indices are set to -1,
+ * so the extraction code does not need to do bounds checks. */
+ int32_t i_security_id;
/* Identity of a reparse point. See
* http://msdn.microsoft.com/en-us/library/windows/desktop/aa365503(v=vs.85).aspx
* for what a reparse point is. */
u32 i_reparse_tag;
- /* Number of dentries that reference this inode */
- u32 i_nlink;
+ /* Unused/unknown fields that we just read into memory so we can
+ * re-write them unchanged. */
+ u32 i_rp_unknown_1;
+ u16 i_rp_unknown_2;
- /* Alternate data stream entries. */
- struct wim_ads_entry *i_ads_entries;
+ /* Corresponds to not_rpfixed in `struct wim_dentry_on_disk': Set to 0
+ * if reparse point fixups have been done. Otherwise set to 1. Note:
+ * this actually may reflect the SYMBOLIC_LINK_RELATIVE flag.
+ */
+ u16 i_not_rpfixed;
- /* Inode number */
+ /* Inode number; corresponds to hard_link_group_id in the `struct
+ * wim_dentry_on_disk'. */
u64 i_ino;
- /* Device number, used only during image capture */
- u64 i_devno;
-
- /* List of dentries that reference this inode (there should be i_nlink
- * of them) */
- struct list_head i_dentry;
-
union {
- struct hlist_node i_hlist;
- struct list_head i_list;
+ /* Device number, used only during image capture, so we can
+ * identify hard linked files by the combination of inode number
+ * and device number (rather than just inode number, which could
+ * be ambigious if the captured tree spans a mountpoint). Set
+ * to 0 otherwise. */
+ u64 i_devno;
+
+ /* Used only during image extraction: pointer to the first path
+ * (malloc()ed buffer) at which this inode has been extracted.
+ * Freed and set to NULL after the extraction is done (either
+ * success or failure). */
+ tchar *i_extracted_file;
};
- tchar *i_extracted_file;
-
- /* Root of a red-black tree storing the children of this inode (if
- * non-empty, implies the inode is a directory, although that is also
- * noted in the @attributes field.) */
- struct rb_root i_children;
-
-#ifdef __WIN32__
- struct rb_root i_children_case_insensitive;
-#endif
-
/* Next alternate data stream ID to be assigned */
u32 i_next_stream_id;
git://wimlib.net / wimlib / blobdiff