do_maple_tree() is similar to do_radix_tree() and do_xarray(), which
takes the same do_maple_tree_traverse entry as tree cmd. Currently
do_maple_tree() is not called by any other functions, we reserve it
for future use.
Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
---
defs.h | 6 +++
maple_tree.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 155 insertions(+)
diff --git a/defs.h b/defs.h
index 3f2453e..827e561 100644
--- a/defs.h
+++ b/defs.h
@@ -5581,6 +5581,12 @@ int cleanup_memory_driver(void);
void maple_init(void);
int do_mptree(struct tree_data *);
+ulong do_maple_tree(ulong, int, struct list_pair *);
+#define MAPLE_TREE_COUNT (1)
+#define MAPLE_TREE_SEARCH (2)
+#define MAPLE_TREE_DUMP (3)
+#define MAPLE_TREE_GATHER (4)
+#define MAPLE_TREE_DUMP_CB (5)
/*
* help.c
diff --git a/maple_tree.c b/maple_tree.c
index 33903cb..e8a287a 100644
--- a/maple_tree.c
+++ b/maple_tree.c
@@ -805,6 +805,13 @@ struct cmd_tree_info {
struct tree_data *td;
} cmd_tree_info;
+struct maple_tree_ops {
+ void (*entry)(ulong node, ulong slot, const char *path,
+ ulong index, void *private);
+ uint radix;
+ void *private;
+} maple_tree_ops;
+
static const char spaces[] = " ";
static void do_mt_range64(const struct maple_tree *, void *,
@@ -1028,6 +1035,10 @@ static void do_mt_entry(void *entry, unsigned long min, unsigned long max,
int print_radix = 0, i;
static struct req_entry **e = NULL;
+ if (maple_tree_ops.entry)
+ maple_tree_ops.entry((ulong)entry, (ulong)entry, path, max,
+ maple_tree_ops.private);
+
if (!cmd_tree_info.td)
return;
@@ -1162,12 +1173,150 @@ int do_mptree(struct tree_data *td)
int is_root = !(td->flags & TREE_NODE_POINTER);
memset(&cmd_tree_info, 0, sizeof(cmd_tree_info));
+ memset(&maple_tree_ops, 0, sizeof(maple_tree_ops));
cmd_tree_info.td = td;
do_maple_tree_traverse(td->start, is_root);
return 0;
}
+/*************For do_maple_tree*****************/
+static void do_maple_tree_count(ulong node, ulong slot, const char *path,
+ ulong index, void *private)
+{
+ struct do_maple_tree_info *info = private;
+ info->count++;
+}
+
+static void do_maple_tree_search(ulong node, ulong slot, const char *path,
+ ulong index, void *private)
+{
+ struct do_maple_tree_info *info = private;
+ struct list_pair *rtp = info->data;
+
+ if (rtp->index == index) {
+ rtp->value = (void *)slot;
+ info->count = 1;
+ }
+}
+
+static void do_maple_tree_dump(ulong node, ulong slot, const char *path,
+ ulong index, void *private)
+{
+ struct do_maple_tree_info *info = private;
+ fprintf(fp, "[%lu] %lx\n", index, slot);
+ info->count++;
+}
+
+static void do_maple_tree_gather(ulong node, ulong slot, const char *path,
+ ulong index, void *private)
+{
+ struct do_maple_tree_info *info = private;
+ struct list_pair *rtp = info->data;
+
+ if (info->maxcount) {
+ rtp[info->count].index = index;
+ rtp[info->count].value = (void *)slot;
+
+ info->count++;
+ info->maxcount--;
+ }
+}
+
+static void do_maple_tree_dump_cb(ulong node, ulong slot, const char *path,
+ ulong index, void *private)
+{
+ struct do_maple_tree_info *info = private;
+ struct list_pair *rtp = info->data;
+ int (*cb)(ulong) = rtp->value;
+
+ /* Caller defined operation */
+ if (!cb(slot)) {
+ error(FATAL, "do_maple_tree: callback "
+ "operation failed: entry: %ld item: %lx\n",
+ info->count, slot);
+ }
+ info->count++;
+}
+
+/*
+ * do_maple_tree argument usage:
+ *
+ * root: Address of a maple_tree_root structure
+ *
+ * flag: MAPLE_TREE_COUNT - Return the number of entries in the tree.
+ * MAPLE_TREE_SEARCH - Search for an entry at rtp->index; if found,
+ * store the entry in rtp->value and return a count of 1; otherwise
+ * return a count of 0.
+ * MAPLE_TREE_DUMP - Dump all existing index/value pairs.
+ * MAPLE_TREE_GATHER - Store all existing index/value pairs in the
+ * passed-in array of list_pair structs starting at rtp,
+ * returning the count of entries stored; the caller can/should
+ * limit the number of returned entries by putting the array size
+ * (max count) in the rtp->index field of the first structure
+ * in the passed-in array.
+ * MAPLE_TREE_DUMP_CB - Similar with MAPLE_TREE_DUMP, but for each
+ * maple tree entry, a user defined callback at rtp->value will
+ * be invoked.
+ *
+ * rtp: Unused by MAPLE_TREE_COUNT and MAPLE_TREE_DUMP.
+ * A pointer to a list_pair structure for MAPLE_TREE_SEARCH.
+ * A pointer to an array of list_pair structures for
+ * MAPLE_TREE_GATHER; the dimension (max count) of the array may
+ * be stored in the index field of the first structure to avoid
+ * any chance of an overrun.
+ * For MAPLE_TREE_DUMP_CB, the rtp->value must be initialized as a
+ * callback function. The callback prototype must be: int (*)(ulong);
+ */
+ulong
+do_maple_tree(ulong root, int flag, struct list_pair *rtp)
+{
+ struct do_maple_tree_info info = {
+ .count = 0,
+ .data = rtp,
+ };
+
+ memset(&maple_tree_ops, 0, sizeof(maple_tree_ops));
+ memset(&cmd_tree_info, 0, sizeof(cmd_tree_info));
+ maple_tree_ops.private = &info;
+
+ switch (flag)
+ {
+ case MAPLE_TREE_COUNT:
+ maple_tree_ops.entry = do_maple_tree_count;
+ break;
+
+ case MAPLE_TREE_SEARCH:
+ maple_tree_ops.entry = do_maple_tree_search;
+ break;
+
+ case MAPLE_TREE_DUMP:
+ maple_tree_ops.entry = do_maple_tree_dump;
+ break;
+
+ case MAPLE_TREE_GATHER:
+ if (!(info.maxcount = rtp->index))
+ info.maxcount = (ulong)(-1); /* caller beware */
+
+ maple_tree_ops.entry = do_maple_tree_gather;
+ break;
+
+ case MAPLE_TREE_DUMP_CB:
+ if (rtp->value == NULL) {
+ error(FATAL, "do_maple_tree: need set callback function");
+ return -EINVAL;
+ }
+ maple_tree_ops.entry = do_maple_tree_dump_cb;
+ break;
+
+ default:
+ error(FATAL, "do_maple_tree: invalid flag: %lx\n", flag);
+ }
+
+ do_maple_tree_traverse(root, true);
+ return info.count;
+}
+
/***********************************************/
void maple_init(void)
{
--
2.33.1
--
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