[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/libbb/inode_hash.c b/ap/app/busybox/src/libbb/inode_hash.c
new file mode 100644
index 0000000..715535e
--- /dev/null
+++ b/ap/app/busybox/src/libbb/inode_hash.c
@@ -0,0 +1,87 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) many different people.
+ * If you wrote this, please acknowledge your work.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+
+typedef struct ino_dev_hash_bucket_struct {
+ struct ino_dev_hash_bucket_struct *next;
+ ino_t ino;
+ dev_t dev;
+ char name[1];
+} ino_dev_hashtable_bucket_t;
+
+#define HASH_SIZE 311 /* Should be prime */
+#define hash_inode(i) ((i) % HASH_SIZE)
+
+/* array of [HASH_SIZE] elements */
+static ino_dev_hashtable_bucket_t **ino_dev_hashtable;
+
+/*
+ * Return name if statbuf->st_ino && statbuf->st_dev are recorded in
+ * ino_dev_hashtable, else return NULL
+ */
+char* FAST_FUNC is_in_ino_dev_hashtable(const struct stat *statbuf)
+{
+ ino_dev_hashtable_bucket_t *bucket;
+
+ if (!ino_dev_hashtable)
+ return NULL;
+
+ bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
+ while (bucket != NULL) {
+ if ((bucket->ino == statbuf->st_ino)
+ && (bucket->dev == statbuf->st_dev)
+ ) {
+ return bucket->name;
+ }
+ bucket = bucket->next;
+ }
+ return NULL;
+}
+
+/* Add statbuf to statbuf hash table */
+void FAST_FUNC add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
+{
+ int i;
+ ino_dev_hashtable_bucket_t *bucket;
+
+ i = hash_inode(statbuf->st_ino);
+ if (!name)
+ name = "";
+ bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + strlen(name));
+ bucket->ino = statbuf->st_ino;
+ bucket->dev = statbuf->st_dev;
+ strcpy(bucket->name, name);
+
+ if (!ino_dev_hashtable)
+ ino_dev_hashtable = xzalloc(HASH_SIZE * sizeof(*ino_dev_hashtable));
+
+ bucket->next = ino_dev_hashtable[i];
+ ino_dev_hashtable[i] = bucket;
+}
+
+#if ENABLE_DU || ENABLE_FEATURE_CLEAN_UP
+/* Clear statbuf hash table */
+void FAST_FUNC reset_ino_dev_hashtable(void)
+{
+ int i;
+ ino_dev_hashtable_bucket_t *bucket;
+
+ for (i = 0; ino_dev_hashtable && i < HASH_SIZE; i++) {
+ while (ino_dev_hashtable[i] != NULL) {
+ bucket = ino_dev_hashtable[i]->next;
+ free(ino_dev_hashtable[i]);
+ ino_dev_hashtable[i] = bucket;
+ }
+ }
+ free(ino_dev_hashtable);
+ ino_dev_hashtable = NULL;
+}
+#endif