From: Thomas Schoebel-Theuer <tst@schoebel-theuer.de>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 10/50] mars: add new file drivers/block/mars/brick.c
Date: Tue,  1 Jul 2014 23:46:50 +0200
Message-Id: <1404251250-22992-11-git-send-email-tst@schoebel-theuer.de>
In-Reply-To: <1404251250-22992-1-git-send-email-tst@schoebel-theuer.de>
References: <1404251250-22992-1-git-send-email-tst@schoebel-theuer.de>
Sender: linux-kernel-owner@vger.kernel.org

Signed-off-by: Thomas Schoebel-Theuer <tst@schoebel-theuer.de>
---
 drivers/block/mars/brick.c | 801 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 801 insertions(+)
 create mode 100644 drivers/block/mars/brick.c

diff --git a/drivers/block/mars/brick.c b/drivers/block/mars/brick.c
new file mode 100644
index 0000000..8826a0d
--- /dev/null
+++ b/drivers/block/mars/brick.c
@@ -0,0 +1,801 @@
+/*  (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#define _STRATEGY
+
+#include <linux/brick/brick.h>
+#include <linux/brick/brick_mem.h>
+
+/************************************************************/
+
+/*  init / exit functions */
+
+void _generic_output_init(struct generic_brick *brick,
+	const struct generic_output_type *type,
+	struct generic_output *output)
+{
+	output->brick = brick;
+	output->type = type;
+	output->ops = type->master_ops;
+	output->nr_connected = 0;
+	INIT_LIST_HEAD(&output->output_head);
+}
+EXPORT_SYMBOL_GPL(_generic_output_init);
+
+void _generic_output_exit(struct generic_output *output)
+{
+	list_del_init(&output->output_head);
+	output->brick = NULL;
+	output->type = NULL;
+	output->ops = NULL;
+	output->nr_connected = 0;
+}
+EXPORT_SYMBOL_GPL(_generic_output_exit);
+
+int generic_brick_init(const struct generic_brick_type *type, struct generic_brick *brick)
+{
+	brick->aspect_context.brick_index = get_brick_nr();
+	brick->type = type;
+	brick->ops = type->master_ops;
+	brick->nr_inputs = 0;
+	brick->nr_outputs = 0;
+	brick->power.off_led = true;
+	init_waitqueue_head(&brick->power.event);
+	INIT_LIST_HEAD(&brick->tmp_head);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_brick_init);
+
+void generic_brick_exit(struct generic_brick *brick)
+{
+	list_del_init(&brick->tmp_head);
+	brick->type = NULL;
+	brick->ops = NULL;
+	brick->nr_inputs = 0;
+	brick->nr_outputs = 0;
+	put_brick_nr(brick->aspect_context.brick_index);
+}
+EXPORT_SYMBOL_GPL(generic_brick_exit);
+
+int generic_input_init(struct generic_brick *brick,
+	int index,
+	const struct generic_input_type *type,
+	struct generic_input *input)
+{
+	if (index < 0 || index >= brick->type->max_inputs)
+		return -EINVAL;
+	if (brick->inputs[index])
+		return -EEXIST;
+	input->brick = brick;
+	input->type = type;
+	input->connect = NULL;
+	INIT_LIST_HEAD(&input->input_head);
+	brick->inputs[index] = input;
+	brick->nr_inputs++;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_input_init);
+
+void generic_input_exit(struct generic_input *input)
+{
+	list_del_init(&input->input_head);
+	input->brick = NULL;
+	input->type = NULL;
+	input->connect = NULL;
+}
+EXPORT_SYMBOL_GPL(generic_input_exit);
+
+int generic_output_init(struct generic_brick *brick,
+	int index,
+	const struct generic_output_type *type,
+	struct generic_output *output)
+{
+	if (index < 0 || index >= brick->type->max_outputs)
+		return -ENOMEM;
+	if (brick->outputs[index])
+		return -EEXIST;
+	_generic_output_init(brick, type, output);
+	brick->outputs[index] = output;
+	brick->nr_outputs++;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_output_init);
+
+int generic_size(const struct generic_brick_type *brick_type)
+{
+	int size = brick_type->brick_size;
+	int i;
+
+	size += brick_type->max_inputs * sizeof(void *);
+	for (i = 0; i < brick_type->max_inputs; i++)
+		size += brick_type->default_input_types[i]->input_size;
+	size += brick_type->max_outputs * sizeof(void *);
+	for (i = 0; i < brick_type->max_outputs; i++)
+		size += brick_type->default_output_types[i]->output_size;
+	return size;
+}
+EXPORT_SYMBOL_GPL(generic_size);
+
+int generic_connect(struct generic_input *input, struct generic_output *output)
+{
+	BRICK_DBG("generic_connect(input=%p, output=%p)\n", input, output);
+	if (unlikely(!input || !output))
+		return -EINVAL;
+	if (unlikely(input->connect))
+		return -EEXIST;
+	if (unlikely(!list_empty(&input->input_head)))
+		return -EINVAL;
+	/*  helps only against the most common errors */
+	if (unlikely(input->brick == output->brick))
+		return -EDEADLK;
+
+	input->connect = output;
+	output->nr_connected++;
+	list_add(&input->input_head, &output->output_head);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_connect);
+
+int generic_disconnect(struct generic_input *input)
+{
+	struct generic_output *connect;
+
+	BRICK_DBG("generic_disconnect(input=%p)\n", input);
+	if (!input)
+		return -EINVAL;
+	connect = input->connect;
+	if (connect) {
+		connect->nr_connected--;
+		input->connect = NULL;
+		list_del_init(&input->input_head);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_disconnect);
+
+/************************************************************/
+
+/*  general */
+
+int _brick_msleep(int msecs, bool shorten)
+{
+	unsigned long timeout;
+
+	flush_signals(current);
+	if (msecs <= 0) {
+		schedule();
+		return 0;
+	}
+	timeout = msecs_to_jiffies(msecs) + 1;
+
+	timeout = schedule_timeout_interruptible(timeout);
+
+	if (!shorten) {
+		while ((long)timeout > 0)
+			timeout = schedule_timeout_uninterruptible(timeout);
+	}
+
+	return jiffies_to_msecs(timeout);
+}
+EXPORT_SYMBOL_GPL(_brick_msleep);
+
+struct kthread {
+	unsigned long flags;
+	unsigned int cpu;
+	void *data;
+	struct completion parked;
+	struct completion exited;
+};
+
+enum KTHREAD_BITS {
+	KTHREAD_IS_PER_CPU = 0,
+	KTHREAD_SHOULD_STOP,
+	KTHREAD_SHOULD_PARK,
+	KTHREAD_IS_PARKED,
+};
+
+#define to_kthread(tsk)							\
+	container_of((tsk)->vfork_done, struct kthread, exited)
+
+/**
+ * kthread_stop_nowait - like kthread_stop(), but don't wait for termination.
+ * @k: thread created by kthread_create().
+ *
+ * If threadfn() may call do_exit() itself, the caller must ensure
+ * task_struct can't go away.
+ *
+ * Therefore, you must not call this twice (or after kthread_stop()), at least
+ * if you don't get_task_struct() yourself.
+ */
+static struct kthread *task_get_live_kthread(struct task_struct *k)
+{
+	struct kthread *kthread;
+
+	get_task_struct(k);
+	kthread = to_kthread(k);
+	/* It might have exited */
+	barrier();
+	if (k->vfork_done != NULL)
+		return kthread;
+	return NULL;
+}
+
+void kthread_stop_nowait(struct task_struct *k)
+{
+	struct kthread *kthread = task_get_live_kthread(k);
+
+	if (kthread) {
+		set_bit(KTHREAD_SHOULD_STOP, &kthread->flags);
+		clear_bit(KTHREAD_SHOULD_PARK, &kthread->flags);
+		wake_up_process(k);
+		wait_for_completion(&kthread->exited);
+	}
+
+	put_task_struct(k);
+}
+EXPORT_SYMBOL_GPL(kthread_stop_nowait);
+
+void brick_thread_stop_nowait(struct task_struct *k)
+{
+	kthread_stop_nowait(k);
+}
+EXPORT_SYMBOL_GPL(brick_thread_stop_nowait);
+
+/************************************************************/
+
+/*  number management */
+
+static char *nr_table;
+int nr_max = 256;
+EXPORT_SYMBOL_GPL(nr_max);
+
+int get_brick_nr(void)
+{
+	char *new;
+	int nr;
+
+	if (unlikely(!nr_table))
+		nr_table = brick_zmem_alloc(nr_max);
+
+	for (;;) {
+		for (nr = 1; nr < nr_max; nr++) {
+			if (!nr_table[nr]) {
+				nr_table[nr] = 1;
+				return nr;
+			}
+		}
+		new = brick_zmem_alloc(nr_max << 1);
+		memcpy(new, nr_table, nr_max);
+		brick_mem_free(nr_table);
+		nr_table = new;
+		nr_max <<= 1;
+	}
+}
+EXPORT_SYMBOL_GPL(get_brick_nr);
+
+void put_brick_nr(int nr)
+{
+	if (likely(nr_table && nr > 0 && nr < nr_max))
+		nr_table[nr] = 0;
+}
+EXPORT_SYMBOL_GPL(put_brick_nr);
+
+/************************************************************/
+
+/*  object stuff */
+
+/************************************************************/
+
+/*  brick stuff */
+
+static int nr_brick_types;
+static const struct generic_brick_type *brick_types[MAX_BRICK_TYPES];
+
+int generic_register_brick_type(const struct generic_brick_type *new_type)
+{
+	int i;
+	int found = -1;
+
+	BRICK_DBG("generic_register_brick_type() name=%s\n", new_type->type_name);
+	for (i = 0; i < nr_brick_types; i++) {
+		if (!brick_types[i]) {
+			found = i;
+			continue;
+		}
+		if (!strcmp(brick_types[i]->type_name, new_type->type_name))
+			return 0;
+	}
+	if (found < 0) {
+		if (nr_brick_types >= MAX_BRICK_TYPES) {
+			BRICK_ERR("sorry, cannot register bricktype %s.\n", new_type->type_name);
+			return -ENOMEM;
+		}
+		found = nr_brick_types++;
+	}
+	brick_types[found] = new_type;
+	BRICK_DBG("generic_register_brick_type() done.\n");
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_register_brick_type);
+
+int generic_unregister_brick_type(const struct generic_brick_type *old_type)
+{
+	BRICK_DBG("generic_unregister_brick_type()\n");
+	return -1; /*  NYI */
+}
+EXPORT_SYMBOL_GPL(generic_unregister_brick_type);
+
+int generic_brick_init_full(
+	void *data,
+	int size,
+	const struct generic_brick_type *brick_type,
+	const struct generic_input_type **input_types,
+	const struct generic_output_type **output_types)
+{
+	struct generic_brick *brick = data;
+	int status;
+	int i;
+
+	if (unlikely(!data)) {
+		BRICK_ERR("invalid memory\n");
+		return -EINVAL;
+	}
+
+	/*  call the generic constructors */
+
+	status = generic_brick_init(brick_type, brick);
+	if (status)
+		return status;
+	data += brick_type->brick_size;
+	size -= brick_type->brick_size;
+	if (size < 0) {
+		BRICK_ERR("Not enough MEMORY\n");
+		return -ENOMEM;
+	}
+	if (!input_types) {
+		input_types = brick_type->default_input_types;
+		if (unlikely(!input_types)) {
+			BRICK_ERR("no input types specified\n");
+			return -EINVAL;
+		}
+	}
+	brick->inputs = data;
+	data += sizeof(void *) * brick_type->max_inputs;
+	size -= sizeof(void *) * brick_type->max_inputs;
+	if (size < 0)
+		return -ENOMEM;
+	for (i = 0; i < brick_type->max_inputs; i++) {
+		struct generic_input *input = data;
+		const struct generic_input_type *type = *input_types++;
+
+		if (!type || type->input_size <= 0)
+			return -EINVAL;
+		BRICK_DBG("generic_brick_init_full: calling generic_input_init()\n");
+		status = generic_input_init(brick, i, type, input);
+		if (status < 0)
+			return status;
+		data += type->input_size;
+		size -= type->input_size;
+		if (size < 0)
+			return -ENOMEM;
+	}
+	if (!output_types) {
+		output_types = brick_type->default_output_types;
+		if (unlikely(!output_types)) {
+			BRICK_ERR("no output types specified\n");
+			return -EINVAL;
+		}
+	}
+	brick->outputs = data;
+	data += sizeof(void *) * brick_type->max_outputs;
+	size -= sizeof(void *) * brick_type->max_outputs;
+	if (size < 0)
+		return -ENOMEM;
+	for (i = 0; i < brick_type->max_outputs; i++) {
+		struct generic_output *output = data;
+		const struct generic_output_type *type = *output_types++;
+
+		if (!type || type->output_size <= 0)
+			return -EINVAL;
+		BRICK_DBG("generic_brick_init_full: calling generic_output_init()\n");
+		generic_output_init(brick, i, type, output);
+		if (status < 0)
+			return status;
+		data += type->output_size;
+		size -= type->output_size;
+		if (size < 0)
+			return -ENOMEM;
+	}
+
+	/*  call the specific constructors */
+	if (brick_type->brick_construct) {
+		BRICK_DBG("generic_brick_init_full: calling brick_construct()\n");
+		status = brick_type->brick_construct(brick);
+		if (status < 0)
+			return status;
+	}
+	for (i = 0; i < brick_type->max_inputs; i++) {
+		struct generic_input *input = brick->inputs[i];
+
+		if (!input)
+			continue;
+		if (!input->type) {
+			BRICK_ERR("input has no associated type!\n");
+			continue;
+		}
+		if (input->type->input_construct) {
+			BRICK_DBG("generic_brick_init_full: calling input_construct()\n");
+			status = input->type->input_construct(input);
+			if (status < 0)
+				return status;
+		}
+	}
+	for (i = 0; i < brick_type->max_outputs; i++) {
+		struct generic_output *output = brick->outputs[i];
+
+		if (!output)
+			continue;
+		if (!output->type) {
+			BRICK_ERR("output has no associated type!\n");
+			continue;
+		}
+		if (output->type->output_construct) {
+			BRICK_DBG("generic_brick_init_full: calling output_construct()\n");
+			status = output->type->output_construct(output);
+			if (status < 0)
+				return status;
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_brick_init_full);
+
+int generic_brick_exit_full(struct generic_brick *brick)
+{
+	int i;
+	int status;
+
+	/*  first, check all outputs */
+	for (i = 0; i < brick->type->max_outputs; i++) {
+		struct generic_output *output = brick->outputs[i];
+
+		if (!output)
+			continue;
+		if (!output->type) {
+			BRICK_ERR("output has no associated type!\n");
+			continue;
+		}
+		if (output->nr_connected) {
+			BRICK_ERR("output is connected!\n");
+			return -EPERM;
+		}
+	}
+	/*  ok, test succeeded. start destruction... */
+	for (i = 0; i < brick->type->max_outputs; i++) {
+		struct generic_output *output = brick->outputs[i];
+
+		if (!output)
+			continue;
+		if (!output->type) {
+			BRICK_ERR("output has no associated type!\n");
+			continue;
+		}
+		if (output->type->output_destruct) {
+			BRICK_DBG("generic_brick_exit_full: calling output_destruct()\n");
+			status = output->type->output_destruct(output);
+			if (status < 0)
+				return status;
+			_generic_output_exit(output);
+			brick->outputs[i] = NULL; /*  others may remain leftover */
+		}
+	}
+	for (i = 0; i < brick->type->max_inputs; i++) {
+		struct generic_input *input = brick->inputs[i];
+
+		if (!input)
+			continue;
+		if (!input->type) {
+			BRICK_ERR("input has no associated type!\n");
+			continue;
+		}
+		if (input->type->input_destruct) {
+			status = generic_disconnect(input);
+			if (status < 0)
+				return status;
+			BRICK_DBG("generic_brick_exit_full: calling input_destruct()\n");
+			status = input->type->input_destruct(input);
+			if (status < 0)
+				return status;
+			brick->inputs[i] = NULL; /*  others may remain leftover */
+			generic_input_exit(input);
+		}
+	}
+	if (brick->type->brick_destruct) {
+		BRICK_DBG("generic_brick_exit_full: calling brick_destruct()\n");
+		status = brick->type->brick_destruct(brick);
+		if (status < 0)
+			return status;
+	}
+	generic_brick_exit(brick);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(generic_brick_exit_full);
+
+/**********************************************************************/
+
+/*  default implementations */
+
+struct generic_object *generic_alloc(struct generic_object_layout *object_layout,
+	const struct generic_object_type *object_type)
+{
+	struct generic_object *object;
+	void *data;
+	int object_size;
+	int aspect_nr_max;
+	int total_size;
+	int hint_size;
+
+	CHECK_PTR_NULL(object_type, err);
+	CHECK_PTR(object_layout, err);
+
+	object_size = object_type->default_size;
+	aspect_nr_max = nr_max;
+	total_size = object_size + aspect_nr_max * sizeof(void *);
+	hint_size = object_layout->size_hint;
+	if (likely(total_size <= hint_size)) {
+		total_size = hint_size;
+	} else { /*  usually happens only at the first time */
+		object_layout->size_hint = total_size;
+	}
+
+	data = brick_zmem_alloc(total_size);
+
+	atomic_inc(&object_layout->alloc_count);
+	atomic_inc(&object_layout->total_alloc_count);
+
+	object = data;
+	object->object_type = object_type;
+	object->object_layout = object_layout;
+	object->aspects = data + object_size;
+	object->aspect_nr_max = aspect_nr_max;
+	object->free_offset = object_size + aspect_nr_max * sizeof(void *);
+	object->max_offset = total_size;
+
+	if (object_type->init_fn) {
+		int status = object_type->init_fn(object);
+
+		if (status < 0)
+			goto err_free;
+	}
+
+	return object;
+
+err_free:
+	brick_mem_free(data);
+err:
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(generic_alloc);
+
+void generic_free(struct generic_object *object)
+{
+	const struct generic_object_type *object_type;
+	struct generic_object_layout *object_layout;
+	int i;
+
+	CHECK_PTR(object, done);
+	object_type = object->object_type;
+	CHECK_PTR_NULL(object_type, done);
+	object_layout = object->object_layout;
+	CHECK_PTR(object_layout, done);
+	_CHECK_ATOMIC(&object->obj_count, !=, 0);
+
+	atomic_dec(&object_layout->alloc_count);
+	for (i = 0; i < object->aspect_nr_max; i++) {
+		const struct generic_aspect_type *aspect_type;
+		struct generic_aspect *aspect = object->aspects[i];
+
+		if (!aspect)
+			continue;
+		object->aspects[i] = NULL;
+		aspect_type = aspect->aspect_type;
+		CHECK_PTR_NULL(aspect_type, done);
+		if (aspect_type->exit_fn)
+			aspect_type->exit_fn(aspect);
+		if (aspect->shortcut)
+			continue;
+		brick_mem_free(aspect);
+		atomic_dec(&object_layout->aspect_count);
+	}
+	if (object_type->exit_fn)
+		object_type->exit_fn(object);
+	brick_mem_free(object);
+done:;
+}
+EXPORT_SYMBOL_GPL(generic_free);
+
+static inline
+struct generic_aspect *_new_aspect(const struct generic_aspect_type *aspect_type, struct generic_object *obj)
+{
+	struct generic_aspect *res = NULL;
+	int size;
+	int rest;
+
+	size = aspect_type->aspect_size;
+	rest = obj->max_offset - obj->free_offset;
+	if (likely(size <= rest)) {
+		/* Optimisation: re-use single memory allocation for both
+		 * the object and the new aspect.
+		 */
+		res = ((void *)obj) + obj->free_offset;
+		obj->free_offset += size;
+		res->shortcut = true;
+	} else {
+		struct generic_object_layout *object_layout = obj->object_layout;
+
+		CHECK_PTR(object_layout, done);
+		/* Maintain the size hint.
+		 * In future, only small aspects should be integrated into
+		 * the same memory block, and the hint should not grow larger
+		 * than PAGE_SIZE if it was smaller before.
+		 */
+		if (size < PAGE_SIZE / 2) {
+			int max;
+
+			max = obj->free_offset + size;
+			/* This is racy, but races won't do any harm because
+			 * it is just a hint, not essential.
+			 */
+			if ((max < PAGE_SIZE || object_layout->size_hint > PAGE_SIZE) &&
+			    object_layout->size_hint < max)
+				object_layout->size_hint = max;
+		}
+
+		res = brick_zmem_alloc(size);
+		atomic_inc(&object_layout->aspect_count);
+		atomic_inc(&object_layout->total_aspect_count);
+	}
+	res->object = obj;
+	res->aspect_type = aspect_type;
+
+	if (aspect_type->init_fn) {
+		int status = aspect_type->init_fn(res);
+
+		if (unlikely(status < 0)) {
+			BRICK_ERR("aspect init %p %p %p status = %d\n", aspect_type, obj, res, status);
+			goto done;
+		}
+	}
+
+done:
+	return res;
+}
+
+struct generic_aspect *generic_get_aspect(struct generic_brick *brick, struct generic_object *obj)
+{
+	struct generic_aspect *res = NULL;
+	int nr;
+
+	CHECK_PTR(brick, done);
+	CHECK_PTR(obj, done);
+
+	nr = brick->aspect_context.brick_index;
+	if (unlikely(nr <= 0 || nr >= obj->aspect_nr_max)) {
+		BRICK_ERR("bad nr = %d\n", nr);
+		goto done;
+	}
+
+	res = obj->aspects[nr];
+	if (!res) {
+		const struct generic_object_type *object_type = obj->object_type;
+		const struct generic_brick_type *brick_type = brick->type;
+		const struct generic_aspect_type *aspect_type;
+		int object_type_nr;
+
+		CHECK_PTR_NULL(object_type, done);
+		CHECK_PTR_NULL(brick_type, done);
+		object_type_nr = object_type->object_type_nr;
+		aspect_type = brick_type->aspect_types[object_type_nr];
+		CHECK_PTR_NULL(aspect_type, done);
+
+		res = _new_aspect(aspect_type, obj);
+
+		obj->aspects[nr] = res;
+	}
+	CHECK_PTR(res, done);
+	CHECK_PTR(res->object, done);
+	_CHECK(res->object == obj, done);
+
+done:
+	return res;
+}
+EXPORT_SYMBOL_GPL(generic_get_aspect);
+
+/***************************************************************/
+
+/*  helper stuff */
+
+void set_button(struct generic_switch *sw, bool val, bool force)
+{
+	bool oldval = sw->button;
+
+	sw->force_off |= force;
+	if (sw->force_off)
+		val = false;
+	if (val != oldval) {
+		sw->button = val;
+		wake_up_interruptible(&sw->event);
+	}
+}
+EXPORT_SYMBOL_GPL(set_button);
+
+void set_on_led(struct generic_switch *sw, bool val)
+{
+	bool oldval = sw->on_led;
+
+	if (val != oldval) {
+		sw->on_led = val;
+		wake_up_interruptible(&sw->event);
+	}
+}
+EXPORT_SYMBOL_GPL(set_on_led);
+
+void set_off_led(struct generic_switch *sw, bool val)
+{
+	bool oldval = sw->off_led;
+
+	if (val != oldval) {
+		sw->off_led = val;
+		wake_up_interruptible(&sw->event);
+	}
+}
+EXPORT_SYMBOL_GPL(set_off_led);
+
+void set_button_wait(struct generic_brick *brick, bool val, bool force, int timeout)
+{
+	set_button(&brick->power, val, force);
+	if (brick->ops)
+		(void)brick->ops->brick_switch(brick);
+	if (val)
+		wait_event_interruptible_timeout(brick->power.event, brick->power.on_led, timeout);
+	else
+		wait_event_interruptible_timeout(brick->power.event, brick->power.off_led, timeout);
+}
+EXPORT_SYMBOL_GPL(set_button_wait);
+
+/***************************************************************/
+
+/*  meta stuff */
+
+const struct meta *find_meta(const struct meta *meta, const char *field_name)
+{
+	const struct meta *tmp;
+
+	for (tmp = meta; tmp->field_name; tmp++) {
+		if (!strcmp(field_name, tmp->field_name))
+			return tmp;
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(find_meta);
+
+/***********************************************************************/
+
+/*  module init stuff */
+
+int __init init_brick(void)
+{
+	nr_table = brick_zmem_alloc(nr_max);
+	return 0;
+}
+
+void exit_brick(void)
+{
+	if (nr_table) {
+		brick_mem_free(nr_table);
+		nr_table = NULL;
+	}
+}
-- 
2.0.0

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