/* Hash table to find hard link groups, identified by their hard link group ID.
* */
struct link_group_table {
+ /* Fields for the hash table */
struct link_group **array;
u64 num_entries;
u64 capacity;
- struct link_group *singles;
+
+ /*
+ * Linked list of "extra" groups. These may be:
+ *
+ * - Hard link groups of size 1, which are all allowed to have 0 for
+ * their hard link group ID, meaning we cannot insert them into the
+ * hash table
+ * - Groups we create ourselves by splitting a nominal hard link group
+ * due to inconsistencies in the dentries. These groups will have a
+ * hard link group ID duplicated with some other group until
+ * assign_link_group_ids() is called.
+ */
+ struct link_group *extra_groups;
};
/* Returns pointer to a new link group table having the specified capacity */
-struct link_group_table *new_link_group_table(u64 capacity)
+struct link_group_table *new_link_group_table(size_t capacity)
{
struct link_group_table *table;
struct link_group **array;
FREE(table);
goto err;
}
- table->num_entries = 0;
- table->capacity = capacity;
- table->array = array;
- table->singles = NULL;
+ table->num_entries = 0;
+ table->capacity = capacity;
+ table->array = array;
+ table->extra_groups = NULL;
return table;
err:
ERROR("Failed to allocate memory for link group table with capacity %zu",
struct link_group *group;
if (dentry->hard_link == 0) {
- /* Single group--- Add to the singles list (we can't put it in
- * the table itself because all the singles have a link group ID
- * of 0) */
+ /* Single group--- Add to the list of extra groups (we can't put
+ * it in the table itself because all the singles have a link
+ * group ID of 0) */
group = MALLOC(sizeof(struct link_group));
if (!group)
return WIMLIB_ERR_NOMEM;
group->link_group_id = 0;
- group->next = table->singles;
- table->singles = group;
+ group->next = table->extra_groups;
+ table->extra_groups = group;
INIT_LIST_HEAD(&dentry->link_group_list);
group->dentry_list = &dentry->link_group_list;
} else {
return 0;
}
+static void free_link_group_list(struct link_group *group)
+{
+ struct link_group *next_group;
+ while (group) {
+ next_group = group->next;
+ FREE(group);
+ group = next_group;
+ }
+}
+
/* Frees a link group table. */
void free_link_group_table(struct link_group_table *table)
{
if (!table)
return;
- if (table->array) {
- for (u64 i = 0; i < table->capacity; i++) {
- struct link_group *group = table->array[i];
- struct link_group *next;
- while (group) {
- next = group->next;
- FREE(group);
- group = next;
- }
- }
- FREE(table->array);
- }
- single = table->singles;
- while (single) {
- next = single->next;
- FREE(single);
- single = next;
- }
+ if (table->array)
+ for (size_t i = 0; i < table->capacity; i++)
+ free_link_group_list(table->array[i]);
+ free_link_group_list(table->extra_groups);
FREE(table);
}
+u64 assign_link_group_ids_to_list(struct link_group *group, u64 id)
+{
+ struct dentry *dentry;
+ struct list_head *cur;
+ while (group) {
+ cur = group->dentry_list;
+ do {
+ dentry = container_of(cur,
+ struct dentry,
+ link_group_list);
+ dentry->hard_link = id;
+ cur = cur->next;
+ } while (cur != group->dentry_list);
+ group->link_group_id = id;
+ id++;
+ group = group->next;
+ }
+ return id;
+}
+
+/* Insert the link groups in the `extra_groups' list into the hash table */
+static void insert_extra_groups(struct link_group_table *table)
+{
+ struct link_group *group, *next_group;
+ size_t pos;
+
+ group = table->extra_groups;
+ while (group) {
+ next_group = group->next;
+ pos = group->link_group_id % table->capacity;
+ group->next = table->array[pos];
+ table->array[pos] = group;
+ group = next_group;
+ }
+ table->extra_groups = NULL;
+}
+
/* Assign the link group IDs to dentries in a link group table, and return the
* next available link group ID. */
-u64 assign_link_groups(struct link_group_table *table)
+u64 assign_link_group_ids(struct link_group_table *table)
{
DEBUG("Assigning link groups");
/* Assign consecutive link group IDs to each link group in the hash
* table */
u64 id = 1;
- for (u64 i = 0; i < table->capacity; i++) {
- struct link_group *group = table->array[i];
- struct link_group *next_group;
- struct dentry *dentry;
- struct list_head *cur;
- while (group) {
- cur = group->dentry_list;
- do {
- dentry = container_of(cur,
- struct dentry,
- link_group_list);
- dentry->hard_link = id;
- cur = cur->next;
- } while (cur != group->dentry_list);
- id++;
- group = group->next;
- }
+ for (size_t i = 0; i < table->capacity; i++)
+ id = assign_link_group_ids_to_list(table->array[i], id);
+
+ /* Assign link group IDs to the "extra" link groups and insert them into
+ * the hash table */
+ id = assign_link_group_ids_to_list(table->extra_groups, id);
+ insert_extra_groups(table);
+ return id;
+}
+
+
+
+static void inconsistent_link_group(const struct dentry *first_dentry)
+{
+ const struct dentry *dentry = first_dentry;
+
+ ERROR("An inconsistent hard link group that we cannot correct has been "
+ "detected");
+ ERROR("The dentries are located at the following paths:");
+ do {
+ ERROR("`%s'", dentry->full_path_utf8);
+ } while ((dentry = container_of(dentry->link_group_list.next,
+ struct dentry,
+ link_group_list)) != first_dentry);
+}
+
+static bool ref_dentries_consistent(const struct dentry * restrict ref_dentry_1,
+ const struct dentry * restrict ref_dentry_2)
+{
+ wimlib_assert(ref_dentry_1 != ref_dentry_2);
+
+ if (ref_dentry_1->num_ads != ref_dentry_2->num_ads)
+ return false;
+ if (ref_dentry_1->security_id != ref_dentry_2->security_id
+ || ref_dentry_1->attributes != ref_dentry_2->attributes)
+ return false;
+ for (unsigned i = 0; i <= ref_dentry_1->num_ads; i++) {
+ const u8 *ref_1_hash, *ref_2_hash;
+ ref_1_hash = dentry_stream_hash_unresolved(ref_dentry_1, i);
+ ref_2_hash = dentry_stream_hash_unresolved(ref_dentry_2, i);
+ if (!hashes_equal(ref_1_hash, ref_2_hash))
+ return false;
+ if (i && !ads_entries_have_same_name(&ref_dentry_1->ads_entries[i - 1],
+ &ref_dentry_2->ads_entries[i - 1]))
+ return false;
+
}
- /* Assign link group IDs to the link groups that previously had link
- * group IDs of 0, and insert them into the hash table */
- struct link_group *single = table->singles;
- while (single) {
- struct dentry *dentry;
- struct link_group *next_single;
- size_t pos;
+ return true;
+}
+
+static bool dentries_consistent(const struct dentry * restrict ref_dentry,
+ const struct dentry * restrict dentry)
+{
+ wimlib_assert(ref_dentry != dentry);
+
+ if (ref_dentry->num_ads != dentry->num_ads && dentry->num_ads != 0)
+ return false;
+ if (ref_dentry->security_id != dentry->security_id
+ || ref_dentry->attributes != dentry->attributes)
+ return false;
+ for (unsigned i = 0; i <= min(ref_dentry->num_ads, dentry->num_ads); i++) {
+ const u8 *ref_hash, *hash;
+ ref_hash = dentry_stream_hash_unresolved(ref_dentry, i);
+ hash = dentry_stream_hash_unresolved(dentry, i);
+ if (!hashes_equal(ref_hash, hash) && !is_zero_hash(hash))
+ return false;
+ if (i && !ads_entries_have_same_name(&ref_dentry->ads_entries[i - 1],
+ &dentry->ads_entries[i - 1]))
+ return false;
+ }
+ return true;
+}
+
+static int
+fix_true_link_group(struct dentry *first_dentry)
+{
+ struct dentry *dentry;
+ struct dentry *ref_dentry = NULL;
+ u64 last_ctime = 0;
+ u64 last_mtime = 0;
+ u64 last_atime = 0;
+
+ dentry = first_dentry;
+ do {
+ if (!ref_dentry || ref_dentry->num_ads == 0)
+ ref_dentry = dentry;
+ if (dentry->creation_time > last_ctime)
+ last_ctime = dentry->creation_time;
+ if (dentry->last_write_time > last_mtime)
+ last_mtime = dentry->last_write_time;
+ if (dentry->last_access_time > last_atime)
+ last_atime = dentry->last_access_time;
+ } while ((dentry = container_of(dentry->link_group_list.next,
+ struct dentry,
+ link_group_list)) != first_dentry);
+
+
+ ref_dentry->ads_entries_status = ADS_ENTRIES_OWNER;
+ dentry = first_dentry;
+ do {
+ if (dentry != ref_dentry) {
+ if (!dentries_consistent(ref_dentry, dentry)) {
+ inconsistent_link_group(first_dentry);
+ return WIMLIB_ERR_INVALID_DENTRY;
+ }
+ copy_hash(dentry->hash, ref_dentry->hash);
+ dentry_free_ads_entries(dentry);
+ dentry->num_ads = ref_dentry->num_ads;
+ dentry->ads_entries = ref_dentry->ads_entries;
+ dentry->ads_entries_status = ADS_ENTRIES_USER;
+ }
+ dentry->creation_time = last_ctime;
+ dentry->last_write_time = last_mtime;
+ dentry->last_access_time = last_atime;
+ } while ((dentry = container_of(dentry->link_group_list.next,
+ struct dentry,
+ link_group_list)) != first_dentry);
+ return 0;
+}
- next_single = single->next;
+static int
+fix_nominal_link_group(struct link_group *group,
+ struct link_group **new_groups)
+{
+ struct dentry *tmp, *dentry, *ref_dentry;
+ int ret;
+ size_t num_true_link_groups;
+ struct list_head *head;
+ u64 link_group_id;
+
+ LIST_HEAD(dentries_with_data_streams);
+ LIST_HEAD(dentries_with_no_data_streams);
+ LIST_HEAD(true_link_groups);
- dentry = container_of(single->dentry_list, struct dentry,
+ /* Create the lists @dentries_with_data_streams and
+ * @dentries_with_no_data_streams. */
+ dentry = container_of(group->dentry_list, struct dentry,
+ link_group_list);
+ do {
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ const u8 *hash;
+ hash = dentry_stream_hash_unresolved(dentry, i);
+ if (!is_zero_hash(hash)) {
+ list_add(&dentry->tmp_list,
+ &dentries_with_data_streams);
+ goto next_dentry;
+ }
+ }
+ list_add(&dentry->tmp_list,
+ &dentries_with_no_data_streams);
+ next_dentry:
+ dentry = container_of(dentry->link_group_list.next,
+ struct dentry,
link_group_list);
- dentry->hard_link = id;
+ } while (&dentry->link_group_list != group->dentry_list);
- pos = id % table->capacity;
- single->next = table->array[pos];
- table->array[pos] = single;
+ /* If there are no dentries with data streams, we require the nominal
+ * link group to be a true link group */
+ if (list_empty(&dentries_with_data_streams))
+ return fix_true_link_group(container_of(group->dentry_list,
+ struct dentry,
+ link_group_list));
- single = next_single;
- id++;
+ /* One or more dentries had data streams. We check each of these
+ * dentries for consistency with the others to form a set of true link
+ * groups. */
+ num_true_link_groups = 0;
+ list_for_each_entry_safe(dentry, tmp, &dentries_with_data_streams,
+ tmp_list)
+ {
+ list_del(&dentry->tmp_list);
+
+ /* Look for a true link group that is consistent with
+ * this dentry and add this dentry to it. Or, if none
+ * of the true link groups are consistent with this
+ * dentry, make a new one. */
+ list_for_each_entry(ref_dentry, &true_link_groups, tmp_list) {
+ if (ref_dentries_consistent(ref_dentry, dentry)) {
+ list_add(&dentry->link_group_list,
+ &ref_dentry->link_group_list);
+ goto next_dentry_2;
+ }
+ }
+ num_true_link_groups++;
+ list_add(&dentry->tmp_list, &true_link_groups);
+ INIT_LIST_HEAD(&dentry->link_group_list);
+next_dentry_2:
+ ;
}
- table->singles = NULL;
- return id;
+
+ wimlib_assert(num_true_link_groups != 0);
+
+ /* If there were dentries with no data streams, we require there to only
+ * be one true link group so that we know which link group to assign the
+ *
+ * streamless dentries to. */
+ if (!list_empty(&dentries_with_no_data_streams)) {
+ if (num_true_link_groups != 1) {
+ ERROR("Hard link group ambiguity detected!");
+ ERROR("We split up hard link group 0x%"PRIx64" due to "
+ "inconsistencies,");
+ ERROR("but dentries with no stream information remained. "
+ "We don't know which true hard link");
+ ERROR("group to assign them to.");
+ return WIMLIB_ERR_INVALID_DENTRY;
+ }
+ ref_dentry = container_of(true_link_groups.next,
+ struct dentry,
+ tmp_list);
+ list_for_each_entry(dentry, &dentries_with_no_data_streams,
+ tmp_list)
+ {
+ list_add(&dentry->link_group_list,
+ &ref_dentry->link_group_list);
+ }
+ }
+
+ list_for_each_entry(dentry, &true_link_groups, tmp_list) {
+ ret = fix_true_link_group(dentry);
+ if (ret != 0)
+ return ret;
+ }
+
+ /* Make new `struct link_group's for the new link groups */
+ for (head = true_link_groups.next->next;
+ head != &true_link_groups;
+ head = head->next)
+ {
+ dentry = container_of(head, struct dentry, tmp_list);
+ group = MALLOC(sizeof(*group));
+ if (!group) {
+ ERROR("Out of memory");
+ return WIMLIB_ERR_NOMEM;
+ }
+ group->link_group_id = link_group_id;
+ group->dentry_list = &dentry->link_group_list;
+ group->next = *new_groups;
+ *new_groups = group;
+ } while ((head = head->next) != &true_link_groups);
+ return 0;
+}
+
+/*
+ * Goes through each link group and shares the ads_entries (Alternate Data
+ * Stream entries) field of each dentry between members of a hard link group.
+ *
+ * In the process, the dentries in each link group are checked for consistency.
+ * If they contain data features that indicate they cannot really be in the same
+ * hard link group, this should be an error, but in reality this case needs to
+ * be handled, so we split the dentries into different hard link groups.
+ *
+ * One of the dentries in the group is arbitrarily assigned the role of "owner"
+ * (ADS_ENTRIES_OWNER), while the others are "users" (ADS_ENTRIES_USER).
+ */
+int fix_link_groups(struct link_group_table *table)
+{
+ for (u64 i = 0; i < table->capacity; i++) {
+ struct link_group *group = table->array[i];
+ while (group) {
+ int ret;
+ ret = fix_nominal_link_group(group, &table->extra_groups);
+ if (ret != 0)
+ return ret;
+ group = group->next;
+ }
+ }
+ return 0;
}
+#if 0
static bool dentries_have_same_ads(const struct dentry *d1,
const struct dentry *d2)
{
+ wimlib_assert(d1->num_ads == d2->num_ads);
/* Verify stream names and hashes are the same */
for (u16 i = 0; i < d1->num_ads; i++) {
if (strcmp(d1->ads_entries[i].stream_name_utf8,
goto mismatch;
}
}
+ if (owner->last_access_time != user->last_access_time
+ || owner->last_write_time != user->last_write_time
+ || owner->creation_time != user->creation_time) {
+ }
dentry_free_ads_entries(user);
user->ads_entries = owner->ads_entries;
user->ads_entries_status = ADS_ENTRIES_USER;
mismatch_type);
return WIMLIB_ERR_INVALID_DENTRY;
}
-
-static int link_group_free_duplicate_data(struct link_group *group,
- struct link_group **bad_links)
-{
- struct dentry *owner, *user, *tmp;
-
- /* Find a dentry with non-zero hash to use as a possible link group
- * owner (see comments above the share_dentry_ads() function */
- owner = container_of(group->dentry_list, struct dentry,
- link_group_list);
- do {
- /* imagex.exe may move the un-named data stream from the dentry
- * itself to the first alternate data stream, if there are
- * other alternate data streams */
- if (!is_zero_hash(owner->hash) ||
- (owner->num_ads && !is_zero_hash(owner->ads_entries[0].hash)))
- goto found_owner;
- owner = container_of(owner->link_group_list.next,
- struct dentry,
- link_group_list);
- } while (&owner->link_group_list != group->dentry_list);
-
- ERROR("Could not find owner of data streams in hard link group");
- return WIMLIB_ERR_INVALID_DENTRY;
-found_owner:
- owner->ads_entries_status = ADS_ENTRIES_OWNER;
- list_for_each_entry_safe(user, tmp, &owner->link_group_list,
- link_group_list)
- {
- /* I would like it to be an error if two dentries are in the
- * same hard link group but have irreconcilable differences such
- * as different file permissions, but unfortunately some of M$'s
- * WIMs contain many instances of this error. This problem is
- * worked around here by splitting each offending dentry off
- * into its own hard link group. */
- if (share_dentry_ads(owner, user) != 0) {
- struct link_group *single;
- single = MALLOC(sizeof(struct link_group));
- if (!single)
- return WIMLIB_ERR_NOMEM;
- list_del(&user->link_group_list);
- INIT_LIST_HEAD(&user->link_group_list);
- single->link_group_id = 0;
- single->next = *bad_links;
- single->dentry_list = &user->link_group_list;
- *bad_links = single;
- user->ads_entries_status = ADS_ENTRIES_OWNER;
- }
- }
- return 0;
-}
-
-/*
- * Goes through each link group and shares the ads_entries (Alternate Data
- * Stream entries) field of each dentry between members of a hard link group.
- *
- * In the process, the dentries in each link group are checked for consistency.
- * If they contain data features that indicate they cannot really be in the same
- * hard link group, this should be an error, but in reality this case needs to
- * be handled, so we split the dentries into different hard link groups.
- *
- * One of the dentries in the group is arbitrarily assigned the role of "owner"
- * (ADS_ENTRIES_OWNER), while the others are "users" (ADS_ENTRIES_USER).
- */
-int link_groups_free_duplicate_data(struct link_group_table *table)
-{
- for (u64 i = 0; i < table->capacity; i++) {
- struct link_group *group = table->array[i];
- while (group) {
- int ret;
- ret = link_group_free_duplicate_data(group,
- &table->singles);
- if (ret != 0)
- return ret;
- group = group->next;
- }
- }
- return 0;
-}
+#endif
git://wimlib.net / wimlib / blobdiff