TOMOYO: Rename meminfo to stat and show more statistics.
[linux-2.6.git] / security / tomoyo / memory.c
index 39d0128..78b6143 100644 (file)
@@ -29,16 +29,13 @@ void tomoyo_warn_oom(const char *function)
                panic("MAC Initialization failed.\n");
 }
 
+/* Lock for protecting tomoyo_memory_used. */
+static DEFINE_SPINLOCK(tomoyo_policy_memory_lock);
 /* Memoy currently used by policy/audit log/query. */
 unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
 /* Memory quota for "policy"/"audit log"/"query". */
 unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 
-/* Memory allocated for policy. */
-static atomic_t tomoyo_policy_memory_size;
-/* Quota for holding policy. */
-static unsigned int tomoyo_quota_for_policy;
-
 /**
  * tomoyo_memory_ok - Check memory quota.
  *
@@ -50,15 +47,20 @@ static unsigned int tomoyo_quota_for_policy;
  */
 bool tomoyo_memory_ok(void *ptr)
 {
-       size_t s = ptr ? ksize(ptr) : 0;
-       atomic_add(s, &tomoyo_policy_memory_size);
-       if (ptr && (!tomoyo_quota_for_policy ||
-                   atomic_read(&tomoyo_policy_memory_size)
-                   <= tomoyo_quota_for_policy)) {
-               memset(ptr, 0, s);
-               return true;
+       if (ptr) {
+               const size_t s = ksize(ptr);
+               bool result;
+               spin_lock(&tomoyo_policy_memory_lock);
+               tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
+               result = !tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
+                       tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
+                       tomoyo_memory_quota[TOMOYO_MEMORY_POLICY];
+               if (!result)
+                       tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
+               spin_unlock(&tomoyo_policy_memory_lock);
+               if (result)
+                       return true;
        }
-       atomic_sub(s, &tomoyo_policy_memory_size);
        tomoyo_warn_oom(__func__);
        return false;
 }
@@ -91,7 +93,10 @@ void *tomoyo_commit_ok(void *data, const unsigned int size)
  */
 void tomoyo_memory_free(void *ptr)
 {
-       atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
+       size_t s = ksize(ptr);
+       spin_lock(&tomoyo_policy_memory_lock);
+       tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
+       spin_unlock(&tomoyo_policy_memory_lock);
        kfree(ptr);
 }
 
@@ -162,7 +167,6 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
        struct tomoyo_name *ptr;
        unsigned int hash;
        int len;
-       int allocated_len;
        struct list_head *head;
 
        if (!name)
@@ -179,22 +183,17 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
                goto out;
        }
        ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
-       allocated_len = ptr ? ksize(ptr) : 0;
-       if (!ptr || (tomoyo_quota_for_policy &&
-                    atomic_read(&tomoyo_policy_memory_size) + allocated_len
-                    > tomoyo_quota_for_policy)) {
+       if (tomoyo_memory_ok(ptr)) {
+               ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
+               memmove((char *) ptr->entry.name, name, len);
+               atomic_set(&ptr->head.users, 1);
+               tomoyo_fill_path_info(&ptr->entry);
+               list_add_tail(&ptr->head.list, head);
+       } else {
                kfree(ptr);
                ptr = NULL;
-               tomoyo_warn_oom(__func__);
-               goto out;
        }
-       atomic_add(allocated_len, &tomoyo_policy_memory_size);
-       ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
-       memmove((char *) ptr->entry.name, name, len);
-       atomic_set(&ptr->head.users, 1);
-       tomoyo_fill_path_info(&ptr->entry);
-       list_add_tail(&ptr->head.list, head);
- out:
+out:
        mutex_unlock(&tomoyo_policy_lock);
        return ptr ? &ptr->entry : NULL;
 }
@@ -227,65 +226,3 @@ void __init tomoyo_mm_init(void)
        }
 #endif
 }
-
-
-/* Memory allocated for query lists. */
-unsigned int tomoyo_query_memory_size;
-/* Quota for holding query lists. */
-unsigned int tomoyo_quota_for_query;
-
-/**
- * tomoyo_read_memory_counter - Check for memory usage in bytes.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- *
- * Returns memory usage.
- */
-void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
-{
-       if (!head->r.eof) {
-               const unsigned int policy
-                       = atomic_read(&tomoyo_policy_memory_size);
-               const unsigned int query = tomoyo_query_memory_size;
-               char buffer[64];
-
-               memset(buffer, 0, sizeof(buffer));
-               if (tomoyo_quota_for_policy)
-                       snprintf(buffer, sizeof(buffer) - 1,
-                                "   (Quota: %10u)",
-                                tomoyo_quota_for_policy);
-               else
-                       buffer[0] = '\0';
-               tomoyo_io_printf(head, "Policy:       %10u%s\n", policy,
-                                buffer);
-               if (tomoyo_quota_for_query)
-                       snprintf(buffer, sizeof(buffer) - 1,
-                                "   (Quota: %10u)",
-                                tomoyo_quota_for_query);
-               else
-                       buffer[0] = '\0';
-               tomoyo_io_printf(head, "Query lists:  %10u%s\n", query,
-                                buffer);
-               tomoyo_io_printf(head, "Total:        %10u\n", policy + query);
-               head->r.eof = true;
-       }
-}
-
-/**
- * tomoyo_write_memory_quota - Set memory quota.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- *
- * Returns 0.
- */
-int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
-{
-       char *data = head->write_buf;
-       unsigned int size;
-
-       if (sscanf(data, "Policy: %u", &size) == 1)
-               tomoyo_quota_for_policy = size;
-       else if (sscanf(data, "Query lists: %u", &size) == 1)
-               tomoyo_quota_for_query = size;
-       return 0;
-}