Changeset 5bf76c1 in mainline for uspace/lib/fs/libfs.c

Timestamp:

2011-09-24T16:15:41Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

32f623d9

Parents:

925a21e

Message:

Move the fs instance managing logic out of mfs to libfs.

File:

• uspace/lib/fs/libfs.c (modified) (1 diff)

uspace/lib/fs/libfs.c

@@ -877 +877 @@
 }
 
+static FIBRIL_MUTEX_INITIALIZE(instances_mutex);
+static LIST_INITIALIZE(instances_list);
+
+typedef struct {
+        service_id_t service_id;
+        link_t link;
+        void *data;
+} fs_instance_t;
+
+int fs_instance_create(service_id_t service_id, void *data)
+{
+        fs_instance_t *inst = malloc(sizeof(fs_instance_t));
+        if (!inst)
+                return ENOMEM;
+
+        link_initialize(&inst->link);
+        inst->service_id = service_id;
+        inst->data = data;
+
+        fibril_mutex_lock(&instances_mutex);
+        list_foreach(instances_list, link) {
+                fs_instance_t *cur = list_get_instance(link, fs_instance_t,
+                    link);
+
+                if (cur->service_id == service_id) {
+                        fibril_mutex_unlock(&instances_mutex);
+                        free(inst);
+                        return EEXIST;
+                }
+
+                /* keep the list sorted */
+                if (cur->service_id < service_id) {
+                        list_insert_before(&inst->link, &cur->link);
+                        fibril_mutex_unlock(&instances_mutex);
+                        return EOK;
+                }
+        }
+        list_append(&inst->link, &instances_list);
+        fibril_mutex_unlock(&instances_mutex);
+
+        return EOK;
+}
+
+int fs_instance_get(service_id_t service_id, void **idp)
+{
+        fibril_mutex_lock(&instances_mutex);
+        list_foreach(instances_list, link) {
+                fs_instance_t *inst = list_get_instance(link, fs_instance_t,
+                    link);
+
+                if (inst->service_id == service_id) {
+                        *idp = inst->data;
+                        fibril_mutex_unlock(&instances_mutex);
+                        return EOK;
+                }
+        }
+        fibril_mutex_unlock(&instances_mutex);
+        return ENOENT;
+}
+
+int fs_instance_destroy(service_id_t service_id)
+{
+        fibril_mutex_lock(&instances_mutex);
+        list_foreach(instances_list, link) {
+                fs_instance_t *inst = list_get_instance(link, fs_instance_t,
+                    link);
+
+                if (inst->service_id == service_id) {
+                        list_remove(&inst->link);
+                        fibril_mutex_unlock(&instances_mutex);
+                        free(inst);
+                        return EOK;
+                }
+        }
+        fibril_mutex_unlock(&instances_mutex);
+        return ENOENT;
+}
+
 /** @}
  */