wimfs_write(), dentry_to_stbuf()
[wimlib] / src / hardlink.c
index e3f30b45b1513ca8f92261278db52dc4ab3ed4d5..4640c9cf12524471f7efb92b977e5c8ecaf73358 100644 (file)
@@ -13,13 +13,33 @@ struct link_group_table {
        struct link_group **array;
        u64 num_entries;
        u64 capacity;
+       struct link_group *singles;
 };
 
 #include <sys/mman.h>
 
 struct link_group_table *new_link_group_table(u64 capacity)
 {
-       return (struct link_group_table*)new_lookup_table(capacity);
+       struct link_group_table *table;
+       struct link_group **array;
+
+       table = MALLOC(sizeof(struct link_group_table));
+       if (!table)
+               goto err;
+       array = CALLOC(capacity, sizeof(array[0]));
+       if (!array) {
+               FREE(table);
+               goto err;
+       }
+       table->num_entries = 0;
+       table->capacity = capacity;
+       table->array = array;
+       table->singles = NULL;
+       return table;
+err:
+       ERROR("Failed to allocate memory for link group table with capacity %zu",
+             capacity);
+       return NULL;
 }
 
 /* Insert a dentry into the hard link group table based on its hard link group
@@ -37,7 +57,18 @@ int link_group_table_insert(struct dentry *dentry, struct link_group_table *tabl
        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) */
+               group = MALLOC(sizeof(struct link_group));
+               if (!group)
+                       return WIMLIB_ERR_NOMEM;
+               DEBUG("Insert single group `%s'", dentry->full_path_utf8);
+               group->link_group_id = 0;
+               group->next          = table->singles;
+               table->singles       = group;
                INIT_LIST_HEAD(&dentry->link_group_list);
+               group->dentry_list = &dentry->link_group_list;
                return 0;
        }
 
@@ -92,51 +123,46 @@ void free_link_group_table(struct link_group_table *table)
  * next available link group ID. */
 u64 assign_link_groups(struct link_group_table *table)
 {
-       struct link_group *remaining_groups = NULL;
+       DEBUG("Assigning link groups");
        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) {
-                       next_group = group->next;
-                       u64 cur_id;
-                       struct list_head *dentry_list = group->dentry_list;
-                       if (dentry_list->next == dentry_list) {
-                               /* Hard link group of size 1.  Change the hard
-                                * link ID to 0 and discard the link_group */
-                               cur_id = 0;
-                               FREE(group);
-                       } else {
-                               /* Hard link group of size > 1.  Assign the
-                                * dentries in the group the next available hard
-                                * link IDs and queue the group to be
-                                * re-inserted into the table. */
-                               cur_id = id++;
-                               group->next = remaining_groups;
-                               remaining_groups = group;
-                       }
-                       struct list_head *cur = dentry_list;
+                       cur = group->dentry_list;
                        do {
                                dentry = container_of(cur,
                                                      struct dentry,
                                                      link_group_list);
-                               dentry->hard_link = cur_id;
+                               dentry->hard_link = id;
                                cur = cur->next;
-                       } while (cur != dentry_list);
-                       group = next_group;
+                       } while (cur != group->dentry_list);
+                       id++;
+                       group = group->next;
                }
        }
-       memset(table->array, 0, table->capacity * sizeof(table->array[0]));
-       table->num_entries = 0;
-       while (remaining_groups) {
-               struct link_group *group = remaining_groups;
-               size_t pos = group->link_group_id % table->capacity;
-
-               table->num_entries++;
-               group->next = table->array[pos];
-               table->array[pos] = group;
-               remaining_groups = remaining_groups->next;
+       /* Singles */
+       struct link_group *single = table->singles;
+       while (single) {
+               struct dentry *dentry;
+               struct link_group *next_single;
+               size_t pos;
+
+               next_single = single->next;
+
+               dentry = container_of(single->dentry_list, struct dentry,
+                                     link_group_list);
+               dentry->hard_link = id;
+               DEBUG("Assign single `%s'", dentry->full_path_utf8);
+
+               pos = id % table->capacity;
+               single->next = table->array[pos];
+               table->array[pos] = single;
+
+               single = next_single;
+               id++;
        }
        return id;
 }