X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fdentry.h;h=1e8724cbc973e9665b24321a1297f96aeaa10f69;hp=8283b596bfb0ae84a213c2af2a85e58d16cace93;hb=d5b841b4d3243c7c6922d9254fb4e5b9f0b58d41;hpb=cbda4ad178585ce34762b0da0f488efddd8cf8ae diff --git a/src/dentry.h b/src/dentry.h index 8283b596..1e8724cb 100644 --- a/src/dentry.h +++ b/src/dentry.h @@ -5,12 +5,16 @@ #include "config.h" #include "list.h" #include "sha1.h" +#include "rbtree.h" #include - struct stat; struct lookup_table; struct WIMStruct; +struct lookup_table_entry; +struct wimlib_fd; +struct inode; +struct dentry; /* Size of the struct dentry up to and including the file_name_len. */ #define WIM_DENTRY_DISK_SIZE 102 @@ -19,9 +23,8 @@ struct WIMStruct; * including the stream length field (see below). */ #define WIM_ADS_ENTRY_DISK_SIZE 38 - -/* - * Reparse tags documented at +/* + * Reparse tags documented at * http://msdn.microsoft.com/en-us/library/dd541667(v=prot.10).aspx */ #define WIM_IO_REPARSE_TAG_RESERVED_ZERO 0x00000000 @@ -52,7 +55,6 @@ struct WIMStruct; #define FILE_ATTRIBUTE_ENCRYPTED 0x00004000 #define FILE_ATTRIBUTE_VIRTUAL 0x00010000 -struct lookup_table_entry; /* Alternate data stream entry. * @@ -68,7 +70,8 @@ struct ads_entry { struct lookup_table_entry *lte; }; - /* Length of stream name (UTF-16) */ + /* Length of stream name (UTF-16). This is in bytes, not characters, + * and does not include the terminating null character */ u16 stream_name_len; /* Length of stream name (UTF-8) */ @@ -80,34 +83,13 @@ struct ads_entry { /* Stream name (UTF-8) */ char *stream_name_utf8; - /* Doubly linked list of streams that share the same lookup table entry */ - struct stream_list_head lte_group_list; +#ifdef WITH_FUSE + /* Number to identify an alternate data stream even after it's possibly + * been moved or renamed. */ + u32 stream_id; +#endif }; -/* Returns the total length of a WIM alternate data stream entry on-disk, - * including the stream name, the null terminator, AND the padding after the - * entry to align the next one (or the next dentry) on an 8-byte boundary. */ -static inline u64 ads_entry_total_length(const struct ads_entry *entry) -{ - u64 len = WIM_ADS_ENTRY_DISK_SIZE; - if (entry->stream_name_len) - len += entry->stream_name_len + 2; - return (len + 7) & ~7; -} - -static inline void destroy_ads_entry(struct ads_entry *entry) -{ - FREE(entry->stream_name); - FREE(entry->stream_name_utf8); -} - -static inline bool ads_entry_has_name(const struct ads_entry *entry, - const char *name, size_t name_len) -{ - if (entry->stream_name_utf8_len != name_len) - return false; - return memcmp(entry->stream_name_utf8, name, name_len) == 0; -} static inline bool ads_entries_have_same_name(const struct ads_entry *entry_1, const struct ads_entry *entry_2) @@ -118,42 +100,43 @@ static inline bool ads_entries_have_same_name(const struct ads_entry *entry_1, entry_1->stream_name_len) == 0; } - -/* +/* * In-memory structure for a WIM directory entry (dentry). There is a directory - * tree for each image in the WIM. + * tree for each image in the WIM. * - * Please note that this is a directory entry and not an inode. Since NTFS - * allows hard links, it's possible for a NTFS inode to correspond to multiple - * WIM dentries. The @hard_link field tells you the number of the NTFS inode - * that the dentry corresponds to. + * Note that this is a directory entry and not an inode. Since NTFS allows hard + * links, it's possible for a NTFS inode to correspond to multiple WIM dentries. + * The hard_link field on the on-disk WIM dentry tells us the number of the NTFS + * inode that the dentry corresponds to. * * Unfortunately, WIM files do not have an analogue to an inode; instead certain * information, such as file attributes, the security descriptor, and file * streams is replicated in each hard-linked dentry, even though this - * information really is associated with an inode. + * information really is associated with an inode. In-memory, we fix up this + * flaw by allocating a `struct inode' for each dentry that contains some of + * this duplicated information, then combining the inodes for each hard link + * group together. * - * Confusingly, it's also possible for stream information to be missing from a - * dentry in a hard link set, in which case the stream information needs to be - * gotten from one of the other dentries in the hard link set. In addition, it - * is possible for dentries to have inconsistent security IDs, file attributes, - * or file streams when they share the same hard link ID (don't even ask. I - * hope that Microsoft may have fixed this problem, since I've only noticed it - * in the 'install.wim' for Windows 7). For those dentries, we have to use the - * conflicting fields to split up the hard link groups. + * Confusingly, it's possible for stream information to be missing from a dentry + * in a hard link set, in which case the stream information needs to be gotten + * from one of the other dentries in the hard link set. In addition, it is + * possible for dentries to have inconsistent security IDs, file attributes, or + * file streams when they share the same hard link ID (don't even ask. I hope + * that Microsoft may have fixed this problem, since I've only noticed it in the + * 'install.wim' for Windows 7). For those dentries, we have to use the + * conflicting fields to split up the hard link groups. (See fix_inodes() in + * hardlink.c). */ struct dentry { + /* The inode for this dentry */ + struct inode *d_inode; + /* The parent of this directory entry. */ struct dentry *parent; - /* Linked list of sibling directory entries. */ - struct dentry *next; - struct dentry *prev; + struct rb_node rb_node; - /* Pointer to a child of this directory entry. */ - struct dentry *children; - - /* + /* * Size of directory entry on disk, in bytes. Typical size is around * 104 to 120 bytes. * @@ -173,68 +156,12 @@ struct dentry { */ u64 length; - /* The file attributes associated with this file. This is a bitwise OR - * of the FILE_ATTRIBUTE_* flags. */ - u32 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 security_id; - /* 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; - /* Timestamps for the dentry. 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 creation_time; - u64 last_access_time; - u64 last_write_time; - - /* %true iff the dentry's lookup table entry has been resolved (i.e. the - * @lte field is valid, but the @hash field is not valid) - * - * (This is not an on-disk field.) */ - bool resolved; - - /* A hash of the file's contents, or a pointer to the lookup table entry - * for this dentry if the lookup table entries have been resolved. - * - * More specifically, this is for the un-named default file stream, as - * opposed to the alternate (named) file streams, which may have their - * own lookup table entries. */ - union { - u8 hash[SHA1_HASH_SIZE]; - struct lookup_table_entry *lte; - }; - - /* 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 reparse_tag; - - /* Although M$'s documentation does not tell you this, it seems that the - * reparse_reserved field does not actually exist. So the hard_link - * field directly follows the reparse_tag on disk. EXCEPT when the - * dentry is actually a reparse point... well, just take a look at the - * read_dentry() function. */ - //u32 reparse_reserved; - - /* If the file is part of a hard link set, all the directory entries in - * the set will share the same value for this field. - * - * Unfortunately, in some WIMs it is NOT the case that all dentries that - * share this field are actually in the same hard link set, although the - * WIMs that wimlib writes maintain this restriction. */ - u64 link_group_id; - - /* Number of alternate data streams associated with this file. */ - u16 num_ads; - /* Length of short filename, in bytes, not including the terminating * zero wide-character. */ u16 short_name_len; @@ -260,70 +187,140 @@ struct dentry { char *full_path_utf8; u32 full_path_utf8_len; - /* Alternate stream entries for this dentry (malloc()ed buffer). */ - struct ads_entry *ads_entries; + /* Number of references to the dentry tree itself, as in multiple + * WIMStructs */ + u32 refcnt; - union { - /* Number of references to the dentry tree itself, as in multiple - * WIMStructs */ - u32 refcnt; + /* List of dentries in the inode (hard link set) */ + struct list_head inode_dentry_list; - /* Number of times this dentry has been opened (only for - * directories!) */ - u32 num_times_opened; + union { + struct list_head tmp_list; + bool is_extracted; }; +}; - enum { - /* This dentry is the owner of its ads_entries, although it may - * be in a hard link set */ - ADS_ENTRIES_DEFAULT = 0, +#define rbnode_dentry(node) container_of(node, struct dentry, rb_node) - /* This dentry is the owner of the ads_entries in the hard link - * set */ - ADS_ENTRIES_OWNER, +/* + * 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. + */ +struct 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 creation_time; + u64 last_access_time; + u64 last_write_time; - /* This dentry shares its ads_entries with a dentry in the hard - * link set that has ADS_ENTRIES_OWNER set. */ - ADS_ENTRIES_USER - } ads_entries_status; + /* The file attributes associated with this inode. This is a bitwise OR + * of the FILE_ATTRIBUTE_* flags. */ + u32 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 security_id; - /* List of dentries in the hard link set */ - struct list_head link_group_list; + /* %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 resolved : 1; + + /* %true iff verify_inode() has run on this dentry. */ + u8 verified : 1; + + /* Number of alternate data streams associated with this inode */ + u16 num_ads; + /* A hash of the file's contents, or a pointer to the lookup table entry + * for this dentry if the lookup table entries have been resolved. + * + * More specifically, this is for the un-named default file stream, as + * opposed to the alternate (named) file streams, which may have their + * own lookup table entries. */ union { - /* List of dentries sharing the same lookup table entry */ - struct stream_list_head lte_group_list; - struct list_head tmp_list; + u8 hash[SHA1_HASH_SIZE]; + struct lookup_table_entry *lte; }; - /* Path to extracted file on disk (used during extraction only) - * (malloc()ed buffer, or set the same as full_path_utf8) */ + /* 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 reparse_tag; + + /* Number of dentries that reference this inode */ + u32 link_count; + + /* Alternate data stream entries. */ + struct ads_entry *ads_entries; + + /* Inode number */ + u64 ino; + + /* List of dentries that reference this inode (there should be + * link_count of them) */ + struct list_head dentry_list; + struct hlist_node hlist; char *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 children; + +#ifdef WITH_FUSE + /* wimfs file descriptors table for the inode */ + u16 num_opened_fds; + u16 num_allocated_fds; + struct wimlib_fd **fds; + + /* Next alternate data stream ID to be assigned */ + u32 next_stream_id; +#endif +}; -extern struct ads_entry *dentry_get_ads_entry(struct dentry *dentry, - const char *stream_name); +#define inode_for_each_dentry(dentry, inode) \ + list_for_each_entry((dentry), &(inode)->dentry_list, inode_dentry_list) -extern struct ads_entry *dentry_add_ads(struct dentry *dentry, - const char *stream_name); +#define inode_add_dentry(dentry, inode) \ + ({ \ + wimlib_assert((inode)->dentry_list.next != NULL); \ + list_add(&(dentry)->inode_dentry_list, &(inode)->dentry_list); \ + }) -extern void dentry_remove_ads(struct dentry *dentry, struct ads_entry *entry); +static inline bool dentry_is_extracted(const struct dentry *dentry) +{ + return dentry->is_extracted; +} -extern const char *path_stream_name(const char *path); +static inline bool dentry_is_first_in_inode(const struct dentry *dentry) +{ + return container_of(dentry->d_inode->dentry_list.next, + struct dentry, + inode_dentry_list) == dentry; +} -extern u64 dentry_total_length(const struct dentry *dentry); extern u64 dentry_correct_total_length(const struct dentry *dentry); -extern void stbuf_to_dentry(const struct stat *stbuf, struct dentry *dentry); +extern void stbuf_to_inode(const struct stat *stbuf, struct inode *inode); +extern int inode_to_stbuf(const struct inode *inode, + struct lookup_table_entry *lte, struct stat *stbuf); -extern int for_dentry_in_tree(struct dentry *root, - int (*visitor)(struct dentry*, void*), +extern int for_dentry_in_tree(struct dentry *root, + int (*visitor)(struct dentry*, void*), void *args); -extern int for_dentry_in_tree_depth(struct dentry *root, - int (*visitor)(struct dentry*, void*), +extern int for_dentry_in_rbtree(struct rb_node *node, + int (*visitor)(struct dentry *, void *), + void *arg); + +extern int for_dentry_in_tree_depth(struct dentry *root, + int (*visitor)(struct dentry*, void*), void *args); extern int calculate_dentry_full_path(struct dentry *dentry, void *ignore); @@ -331,101 +328,106 @@ extern void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p extern int get_names(char **name_utf16_ret, char **name_utf8_ret, u16 *name_utf16_len_ret, u16 *name_utf8_len_ret, const char *name); -extern int change_dentry_name(struct dentry *dentry, const char *new_name); -extern int change_ads_name(struct ads_entry *entry, const char *new_name); -extern void unlink_dentry(struct dentry *dentry); -extern void link_dentry(struct dentry *dentry, struct dentry *parent); +extern struct dentry *get_dentry(struct WIMStruct *w, const char *path); +extern struct inode *wim_pathname_to_inode(struct WIMStruct *w, + const char *path); +extern struct dentry *get_dentry_child_with_name(const struct dentry *dentry, + const char *name); +extern struct dentry *get_parent_dentry(struct WIMStruct *w, const char *path); extern int print_dentry(struct dentry *dentry, void *lookup_table); extern int print_dentry_full_path(struct dentry *entry, void *ignore); -extern struct dentry *get_dentry(struct WIMStruct *w, const char *path); -extern struct dentry *get_parent_dentry(struct WIMStruct *w, const char *path); -extern struct dentry *get_dentry_child_with_name(const struct dentry *dentry, - const char *name); -extern void dentry_update_all_timestamps(struct dentry *dentry); -extern void init_dentry(struct dentry *dentry, const char *name); extern struct dentry *new_dentry(const char *name); +extern struct dentry *new_dentry_with_inode(const char *name); +extern struct dentry *new_dentry_with_timeless_inode(const char *name); -extern void dentry_free_ads_entries(struct dentry *dentry); +extern void free_inode(struct inode *inode); extern void free_dentry(struct dentry *dentry); extern void put_dentry(struct dentry *dentry); -extern struct dentry *clone_dentry(struct dentry *old); + extern void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table); extern int increment_dentry_refcnt(struct dentry *dentry, void *ignore); -extern int decrement_dentry_refcnt(struct dentry *dentry, void *ignore); -extern void calculate_dir_tree_statistics(struct dentry *root, - struct lookup_table *table, - u64 *dir_count_ret, - u64 *file_count_ret, - u64 *total_bytes_ret, - u64 *hard_link_bytes_ret); +extern void unlink_dentry(struct dentry *dentry); +extern bool dentry_add_child(struct dentry * restrict parent, + struct dentry * restrict child); -extern int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, - u64 offset, struct dentry *dentry); +// XXX +#define link_dentry(child, parent) dentry_add_child(parent, child) extern int verify_dentry(struct dentry *dentry, void *wim); -extern int read_dentry_tree(const u8 metadata_resource[], - u64 metadata_resource_len, struct dentry *dentry); -extern u8 *write_dentry_tree(const struct dentry *tree, u8 *p); +extern struct ads_entry *inode_get_ads_entry(struct inode *inode, + const char *stream_name, + u16 *idx_ret); +extern struct ads_entry *inode_add_ads(struct inode *dentry, + const char *stream_name); +extern void inode_remove_ads(struct inode *inode, u16 idx, + struct lookup_table *lookup_table); -/* Return the number of dentries in the hard link group */ -static inline size_t dentry_link_group_size(const struct dentry *dentry) -{ - const struct list_head *cur = &dentry->link_group_list; - size_t size = 0; - wimlib_assert(cur != NULL); - do { - size++; - cur = cur->next; - } while (cur != &dentry->link_group_list); - return size; -} +extern int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len, + u64 offset, struct dentry *dentry); + + +extern int read_dentry_tree(const u8 metadata_resource[], + u64 metadata_resource_len, struct dentry *dentry); + +extern u8 *write_dentry_tree(const struct dentry *tree, u8 *p); static inline bool dentry_is_root(const struct dentry *dentry) { return dentry->parent == dentry; } -static inline bool dentry_is_first_sibling(const struct dentry *dentry) +static inline bool inode_is_directory(const struct inode *inode) { - return dentry_is_root(dentry) || dentry->parent->children == dentry; -} - -static inline bool dentry_is_only_child(const struct dentry *dentry) -{ - return dentry->next == dentry; + return (inode->attributes & FILE_ATTRIBUTE_DIRECTORY) + && !(inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT); } static inline bool dentry_is_directory(const struct dentry *dentry) { - return (dentry->attributes & FILE_ATTRIBUTE_DIRECTORY) - && !(dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT); + return inode_is_directory(dentry->d_inode); } /* For our purposes, we consider "real" symlinks and "junction points" to both * be symlinks. */ +static inline bool inode_is_symlink(const struct inode *inode) +{ + return (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT) + && ((inode->reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK) || + inode->reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT); +} + static inline bool dentry_is_symlink(const struct dentry *dentry) { - return (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) - && ((dentry->reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK) || - dentry->reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT); + return inode_is_symlink(dentry->d_inode); +} + +static inline bool inode_is_regular_file(const struct inode *inode) +{ + return !inode_is_directory(inode) && !inode_is_symlink(inode); } static inline bool dentry_is_regular_file(const struct dentry *dentry) { - return !dentry_is_directory(dentry) && !dentry_is_symlink(dentry); + return inode_is_regular_file(dentry->d_inode); +} + +static inline bool inode_has_children(const struct inode *inode) +{ + return inode->children.rb_node != NULL; } static inline bool dentry_is_empty_directory(const struct dentry *dentry) { - return dentry_is_directory(dentry) && dentry->children == NULL; + const struct inode *inode = dentry->d_inode; + return inode_is_directory(inode) && !inode_has_children(inode); } #endif