Since the cache-tree data is saved as part of the directory data,
we already read it at the beginning of the index. The cache-tree
is only converted from this directory data.
The cache-tree data is arranged in a tree, with the children sorted by
pathlen at each node, while the ondisk format is sorted lexically.
So we have to rebuild this format from the on-disk directory list.
Signed-off-by: Thomas Gummerer <t.gummerer@xxxxxxxxx>
---
cache-tree.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
cache-tree.h | 10 +++++++
read-cache.c | 1 +
3 files changed, 104 insertions(+)
diff --git a/cache-tree.c b/cache-tree.c
index 28ed657..440cd04 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -519,6 +519,99 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
return read_one(&buffer, &size);
}
+static struct cache_tree *convert_one(struct directory_queue *queue, int dirnr)
+{
+ int i, subtree_nr;
+ struct cache_tree *it;
+ struct directory_queue *down;
+
+ it = cache_tree();
+ it->entry_count = queue[dirnr].de->de_nentries;
+ subtree_nr = queue[dirnr].de->de_nsubtrees;
+ if (0 <= it->entry_count)
+ hashcpy(it->sha1, queue[dirnr].de->sha1);
+
+ /*
+ * Just a heuristic -- we do not add directories that often but
+ * we do not want to have to extend it immediately when we do,
+ * hence +2.
+ */
+ it->subtree_alloc = subtree_nr + 2;
+ it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
+ down = queue[dirnr].down;
+ for (i = 0; i < subtree_nr; i++) {
+ struct cache_tree *sub;
+ struct cache_tree_sub *subtree;
+ char *buf, *name;
+
+ name = "";
+ buf = strtok(down[i].de->pathname, "/");
+ while (buf) {
+ name = buf;
+ buf = strtok(NULL, "/");
+ }
+ sub = convert_one(down, i);
+ if(!sub)
+ goto free_return;
+ subtree = cache_tree_sub(it, name);
+ subtree->cache_tree = sub;
+ }
+ if (subtree_nr != it->subtree_nr)
+ die("cache-tree: internal error");
+ return it;
+ free_return:
+ cache_tree_free(&it);
+ return NULL;
+}
+
+static int compare_cache_tree_elements(const void *a, const void *b)
+{
+ const struct directory_entry *de1, *de2;
+
+ de1 = ((const struct directory_queue *)a)->de;
+ de2 = ((const struct directory_queue *)b)->de;
+ return subtree_name_cmp(de1->pathname, de1->de_pathlen,
+ de2->pathname, de2->de_pathlen);
+}
+
+static struct directory_entry *sort_directories(struct directory_entry *de,
+ struct directory_queue *queue)
+{
+ int i, nsubtrees;
+
+ nsubtrees = de->de_nsubtrees;
+ for (i = 0; i < nsubtrees; i++) {
+ struct directory_entry *new_de;
+ de = de->next;
+ new_de = xmalloc(directory_entry_size(de->de_pathlen));
+ memcpy(new_de, de, directory_entry_size(de->de_pathlen));
+ queue[i].de = new_de;
+ if (de->de_nsubtrees) {
+ queue[i].down = xcalloc(de->de_nsubtrees,
+ sizeof(struct directory_queue));
+ de = sort_directories(de,
+ queue[i].down);
+ }
+ }
+ qsort(queue, nsubtrees, sizeof(struct directory_queue),
+ compare_cache_tree_elements);
+ return de;
+}
+
+struct cache_tree *cache_tree_convert_v5(struct directory_entry *de)
+{
+ struct directory_queue *queue;
+
+ if (!de->de_nentries)
+ return NULL;
+ queue = xcalloc(1, sizeof(struct directory_queue));
+ queue[0].de = de;
+ queue[0].down = xcalloc(de->de_nsubtrees, sizeof(struct directory_queue));
+
+ sort_directories(de, queue[0].down);
+ return convert_one(queue, 0);
+}
+
static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
{
if (!it)
diff --git a/cache-tree.h b/cache-tree.h
index d8cb2e9..7f29d26 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -20,6 +20,11 @@ struct cache_tree {
struct cache_tree_sub **down;
};
+struct directory_queue {
+ struct directory_queue *down;
+ struct directory_entry *de;
+};
+
struct cache_tree *cache_tree(void);
void cache_tree_free(struct cache_tree **);
void cache_tree_invalidate_path(struct cache_tree *, const char *);
@@ -27,6 +32,11 @@ struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
void cache_tree_write(struct strbuf *, struct cache_tree *root);
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
+/*
+ * This function modifys the directory argument that is given to it.
+ * Don't use it if the directory entries are still needed after.
+ */
+struct cache_tree *cache_tree_convert_v5(struct directory_entry *de);
int cache_tree_fully_valid(struct cache_tree *);
int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int);
diff --git a/read-cache.c b/read-cache.c
index 03370f9..21ae804 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2087,6 +2087,7 @@ static void read_index_v5(struct index_state *istate, void *mmap, int mmap_size,
while (de)
de = read_entries_v5(istate, de, &entry_offset,
&mmap, mmap_size, &nr, &foffsetblock, fd);
+ istate->cache_tree = cache_tree_convert_v5(root_directory);
}
/* remember to discard_cache() before reading a different cache! */
--
1.7.10.GIT
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