mirror of
https://github.com/schoebel/mars
synced 2024-12-17 04:05:03 +00:00
709 lines
17 KiB
C
709 lines
17 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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// Server brick (just for demonstration)
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//#define BRICK_DEBUGGING
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//#define MARS_DEBUGGING
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//#define IO_DEBUGGING
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kthread.h>
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#define _STRATEGY
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#include "mars.h"
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///////////////////////// own type definitions ////////////////////////
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#include "mars_server.h"
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static struct mars_socket *server_socket = NULL;
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static struct task_struct *server_thread = NULL;
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static LIST_HEAD(server_list);
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static spinlock_t server_lock = SPIN_LOCK_UNLOCKED;
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///////////////////////// own helper functions ////////////////////////
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static
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int cb_thread(void *data)
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{
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struct server_brick *brick = data;
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struct mars_socket *sock = brick->handler_socket;
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int status = -EINVAL;
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brick->cb_running = true;
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wake_up_interruptible(&brick->startup_event);
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MARS_DBG("--------------- cb_thread starting on socket %p\n", brick->handler_socket);
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while (!kthread_should_stop() || !list_empty(&brick->cb_read_list) || !list_empty(&brick->cb_write_list)) {
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struct server_mref_aspect *mref_a;
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struct mref_object *mref;
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struct list_head *tmp;
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unsigned long flags;
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wait_event_interruptible_timeout(
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brick->cb_event,
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!list_empty(&brick->cb_read_list) ||
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!list_empty(&brick->cb_write_list) ||
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kthread_should_stop(),
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3 * HZ);
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traced_lock(&brick->cb_lock, flags);
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tmp = brick->cb_write_list.next;
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if (tmp == &brick->cb_write_list) {
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tmp = brick->cb_read_list.next;
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if (tmp == &brick->cb_read_list) {
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traced_unlock(&brick->cb_lock, flags);
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continue;
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}
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}
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list_del_init(tmp);
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traced_unlock(&brick->cb_lock, flags);
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mref_a = container_of(tmp, struct server_mref_aspect, cb_head);
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mref = mref_a->object;
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status = -EINVAL;
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CHECK_PTR(mref, err);
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down(&brick->socket_sem);
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status = mars_send_cb(sock, mref);
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up(&brick->socket_sem);
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err:
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if (unlikely(status < 0)) {
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MARS_WRN("cannot send response, status = %d\n", status);
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#if 0 // THINK: not sure whether we need this at all. The _client_ should be responsible for resending any lost operations. Disable this for the next future.
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traced_lock(&brick->cb_lock, flags);
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if (mref->ref_rw) {
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list_add(tmp, &brick->cb_write_list);
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} else {
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list_add(tmp, &brick->cb_read_list);
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}
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traced_unlock(&brick->cb_lock, flags);
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continue;
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#else
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mars_shutdown_socket(sock);
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#endif
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}
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atomic_dec(&brick->in_flight);
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GENERIC_INPUT_CALL(brick->inputs[0], mref_put, mref);
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}
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brick->cb_running = false;
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MARS_DBG("---------- cb_thread terminating, status = %d\n", status);
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wake_up_interruptible(&brick->startup_event);
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return status;
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}
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static
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void server_endio(struct generic_callback *cb)
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{
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struct server_mref_aspect *mref_a;
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struct mref_object *mref;
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struct server_brick *brick;
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int rw;
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unsigned long flags;
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mref_a = cb->cb_private;
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CHECK_PTR(mref_a, err);
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mref = mref_a->object;
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CHECK_PTR(mref, err);
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brick = mref_a->brick;
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if (!brick) {
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MARS_WRN("late IO callback -- cannot do anything\n");
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return;
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}
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rw = mref->ref_rw;
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traced_lock(&brick->cb_lock, flags);
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if (rw) {
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list_add_tail(&mref_a->cb_head, &brick->cb_write_list);
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} else {
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list_add_tail(&mref_a->cb_head, &brick->cb_read_list);
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}
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traced_unlock(&brick->cb_lock, flags);
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wake_up_interruptible(&brick->cb_event);
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return;
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err:
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MARS_FAT("cannot handle callback - giving up\n");
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}
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int server_io(struct server_brick *brick, struct mars_socket *sock)
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{
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struct mref_object *mref;
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struct server_mref_aspect *mref_a;
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int status = -ENOTRECOVERABLE;
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if (!brick->cb_running || !mars_socket_is_alive(sock))
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goto done;
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mref = server_alloc_mref(brick, &brick->mref_object_layout);
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status = -ENOMEM;
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if (!mref)
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goto done;
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mref_a = server_mref_get_aspect(brick, mref);
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if (unlikely(!mref_a)) {
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mars_free_mref(mref);
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goto done;
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}
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status = mars_recv_mref(sock, mref);
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if (status < 0) {
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mars_free_mref(mref);
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goto done;
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}
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mref_a->brick = brick;
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SETUP_CALLBACK(mref, server_endio, mref_a);
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atomic_inc(&brick->in_flight);
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status = GENERIC_INPUT_CALL(brick->inputs[0], mref_get, mref);
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if (status < 0) {
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MARS_INF("mref_get execution error = %d\n", status);
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SIMPLE_CALLBACK(mref, status);
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status = 0; // continue serving requests
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goto done;
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}
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GENERIC_INPUT_CALL(brick->inputs[0], mref_io, mref);
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done:
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return status;
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}
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static
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void _clean_list(struct server_brick *brick, struct list_head *start)
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{
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for (;;) {
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struct server_mref_aspect *mref_a;
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struct mref_object *mref;
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struct list_head *tmp = start->next;
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if (tmp == start)
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break;
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list_del_init(tmp);
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mref_a = container_of(tmp, struct server_mref_aspect, cb_head);
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mref_a->brick = NULL;
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mref = mref_a->object;
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if (!mref)
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continue;
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GENERIC_INPUT_CALL(brick->inputs[0], mref_put, mref);
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}
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}
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static
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struct task_struct *_grab_handler(struct server_brick *brick)
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{
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struct task_struct *res;
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spin_lock(&server_lock);
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list_del_init(&brick->server_link);
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res = brick->handler_thread;
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brick->handler_thread = NULL;
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spin_unlock(&server_lock);
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return res;
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}
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static
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int handler_thread(void *data)
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{
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struct server_brick *brick = data;
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struct mars_socket *sock = brick->handler_socket;
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struct task_struct *cb_thread = brick->cb_thread;
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int status = 0;
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brick->cb_thread = NULL;
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brick->self_shutdown = true;
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wake_up_interruptible(&brick->startup_event);
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MARS_DBG("--------------- handler_thread starting on socket %p\n", sock);
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//fake_mm();
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while (brick->cb_running && !kthread_should_stop()) {
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struct mars_cmd cmd = {};
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status = mars_recv_struct(sock, &cmd, mars_cmd_meta);
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if (status < 0) {
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MARS_WRN("bad command status = %d\n", status);
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break;
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}
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MARS_IO("cmd = %d\n", cmd.cmd_code);
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status = -EPROTO;
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switch (cmd.cmd_code) {
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case CMD_NOP:
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MARS_DBG("got NOP operation\n");
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status = 0;
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break;
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case CMD_STATUS:
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//...
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MARS_ERR("NYI\n");
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break;
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case CMD_GETINFO:
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{
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struct mars_info info = {};
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status = GENERIC_INPUT_CALL(brick->inputs[0], mars_get_info, &info);
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if (status < 0) {
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break;
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}
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down(&brick->socket_sem);
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status = mars_send_struct(sock, &cmd, mars_cmd_meta);
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if (status < 0) {
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break;
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}
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status = mars_send_struct(sock, &info, mars_info_meta);
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up(&brick->socket_sem);
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break;
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}
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case CMD_GETENTS:
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{
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status = -EINVAL;
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if (unlikely(!cmd.cmd_str1 || !mars_global))
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break;
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down(&brick->socket_sem);
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down_read(&mars_global->dent_mutex);
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status = mars_send_dent_list(sock, &mars_global->dent_anchor);
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up_read(&mars_global->dent_mutex);
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up(&brick->socket_sem);
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if (status < 0) {
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MARS_WRN("could not send dentry information, status = %d\n", status);
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}
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break;
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}
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case CMD_CONNECT:
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{
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struct mars_brick *prev;
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const char *path = cmd.cmd_str1;
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status = -EINVAL;
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CHECK_PTR(path, err);
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CHECK_PTR_NULL(mars_global, err);
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CHECK_PTR_NULL(_bio_brick_type, err);
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if (!mars_global->global_power.button) {
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MARS_WRN("system is not alive\n");
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goto err;
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}
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prev = make_brick_all(
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mars_global,
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NULL,
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true,
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NULL,
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NULL,
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10 * HZ,
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path,
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(const struct generic_brick_type*)_bio_brick_type,
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(const struct generic_brick_type*[]){},
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NULL,
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path,
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(const char *[]){},
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0);
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if (likely(prev)) {
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status = generic_connect((void*)brick->inputs[0], (void*)prev->outputs[0]);
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} else {
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MARS_ERR("cannot find brick '%s'\n", path);
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}
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err:
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cmd.cmd_int1 = status;
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down(&brick->socket_sem);
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status = mars_send_struct(sock, &cmd, mars_cmd_meta);
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up(&brick->socket_sem);
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break;
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}
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case CMD_MREF:
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status = server_io(brick, sock);
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break;
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case CMD_CB:
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MARS_ERR("oops, as a server I should never get CMD_CB; something is wrong here - attack attempt??\n");
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break;
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default:
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MARS_ERR("unknown command %d\n", cmd.cmd_code);
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}
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brick_string_free(cmd.cmd_str1);
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if (status < 0)
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break;
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}
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mars_shutdown_socket(sock);
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MARS_DBG("handler_thread terminating, status = %d\n", status);
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if (cb_thread) {
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MARS_INF("stopping cb thread...\n");
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kthread_stop(cb_thread);
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wait_event_interruptible_timeout(
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brick->startup_event,
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!brick->cb_running,
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10 * HZ);
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put_task_struct(cb_thread);
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}
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_clean_list(brick, &brick->cb_read_list);
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_clean_list(brick, &brick->cb_write_list);
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/* Normally, the brick should be shut down from outside.
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* In case the handler thread stops abnormally (e.g.
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* shutdown of socket etc), it has to cleanup itself.
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* This is an exception to the basic rule of instance orientation
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* that execution logic should be cleanly separated from strategy
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* logic.
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* So be careful, avoid races by use of _grab_handler().
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*/
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if (brick->self_shutdown) {
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struct task_struct *h_thread;
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MARS_DBG("self-shutdown\n");
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h_thread = _grab_handler(brick);
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mars_put_socket(sock);
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brick->handler_socket = NULL;
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if (h_thread) {
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int status;
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MARS_DBG("self cleanup...\n");
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status = mars_kill_brick((void*)brick);
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if (status < 0) {
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MARS_ERR("kill status = %d, giving up\n", status);
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}
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put_task_struct(h_thread);
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}
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}
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MARS_DBG("done.\n");
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return status;
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}
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////////////////// own brick / input / output operations //////////////////
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static int server_get_info(struct server_output *output, struct mars_info *info)
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{
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struct server_input *input = output->brick->inputs[0];
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return GENERIC_INPUT_CALL(input, mars_get_info, info);
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}
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static int server_ref_get(struct server_output *output, struct mref_object *mref)
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{
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struct server_input *input = output->brick->inputs[0];
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return GENERIC_INPUT_CALL(input, mref_get, mref);
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}
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static void server_ref_put(struct server_output *output, struct mref_object *mref)
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{
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struct server_input *input = output->brick->inputs[0];
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GENERIC_INPUT_CALL(input, mref_put, mref);
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}
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static void server_ref_io(struct server_output *output, struct mref_object *mref)
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{
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struct server_input *input = output->brick->inputs[0];
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GENERIC_INPUT_CALL(input, mref_io, mref);
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}
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static int server_switch(struct server_brick *brick)
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{
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int status = 0;
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if (brick->power.button) {
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static int version = 0;
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struct task_struct *thread;
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mars_power_led_off((void*)brick, false);
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MARS_INF("starting.....");
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spin_lock(&server_lock);
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list_add(&brick->server_link, &server_list);
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spin_unlock(&server_lock);
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thread = kthread_create(cb_thread, brick, "mars_cb%d", version);
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if (IS_ERR(thread)) {
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status = PTR_ERR(thread);
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MARS_ERR("cannot create cb thread, status = %d\n", status);
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goto err;
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}
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get_task_struct(thread);
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brick->cb_thread = thread;
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wake_up_process(thread);
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thread = kthread_create(handler_thread, brick, "mars_handler%d", version++);
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if (IS_ERR(thread)) {
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status = PTR_ERR(thread);
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MARS_ERR("cannot create handler thread, status = %d\n", status);
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kthread_stop(brick->cb_thread);
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goto err;
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}
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get_task_struct(thread);
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brick->handler_thread = thread;
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wake_up_process(thread);
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wait_event_interruptible(brick->startup_event, brick->cb_thread == NULL);
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err:
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if (status >= 0) {
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mars_power_led_on((void*)brick, true);
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}
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} else {
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struct task_struct *thread;
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mars_power_led_on((void*)brick, false);
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thread = _grab_handler(brick);
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if (thread) {
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brick->handler_thread = NULL;
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MARS_INF("stopping handler thread....\n");
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mars_shutdown_socket(brick->handler_socket);
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kthread_stop(thread);
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mars_put_socket(brick->handler_socket);
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brick->handler_socket = NULL;
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put_task_struct(thread);
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} else {
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MARS_WRN("handler thread does not exist\n");
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}
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mars_power_led_off((void*)brick, true);
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}
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return status;
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}
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//////////////// object / aspect constructors / destructors ///////////////
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static int server_mref_aspect_init_fn(struct generic_aspect *_ini)
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{
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struct server_mref_aspect *ini = (void*)_ini;
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INIT_LIST_HEAD(&ini->cb_head);
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return 0;
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}
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static void server_mref_aspect_exit_fn(struct generic_aspect *_ini)
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{
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struct server_mref_aspect *ini = (void*)_ini;
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CHECK_HEAD_EMPTY(&ini->cb_head);
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}
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MARS_MAKE_STATICS(server);
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////////////////////// brick constructors / destructors ////////////////////
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static int server_brick_construct(struct server_brick *brick)
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{
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INIT_LIST_HEAD(&brick->server_link);
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init_waitqueue_head(&brick->startup_event);
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init_waitqueue_head(&brick->cb_event);
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sema_init(&brick->socket_sem, 1);
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spin_lock_init(&brick->cb_lock);
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INIT_LIST_HEAD(&brick->cb_read_list);
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INIT_LIST_HEAD(&brick->cb_write_list);
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return 0;
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}
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static int server_output_construct(struct server_output *output)
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{
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return 0;
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}
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///////////////////////// static structs ////////////////////////
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static struct server_brick_ops server_brick_ops = {
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.brick_switch = server_switch,
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};
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static struct server_output_ops server_output_ops = {
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.mars_get_info = server_get_info,
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.mref_get = server_ref_get,
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.mref_put = server_ref_put,
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.mref_io = server_ref_io,
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};
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const struct server_input_type server_input_type = {
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.type_name = "server_input",
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.input_size = sizeof(struct server_input),
|
|
};
|
|
|
|
static const struct server_input_type *server_input_types[] = {
|
|
&server_input_type,
|
|
};
|
|
|
|
const struct server_output_type server_output_type = {
|
|
.type_name = "server_output",
|
|
.output_size = sizeof(struct server_output),
|
|
.master_ops = &server_output_ops,
|
|
.output_construct = &server_output_construct,
|
|
};
|
|
|
|
static const struct server_output_type *server_output_types[] = {
|
|
&server_output_type,
|
|
};
|
|
|
|
const struct server_brick_type server_brick_type = {
|
|
.type_name = "server_brick",
|
|
.brick_size = sizeof(struct server_brick),
|
|
.max_inputs = 1,
|
|
.max_outputs = 0,
|
|
.master_ops = &server_brick_ops,
|
|
.aspect_types = server_aspect_types,
|
|
.default_input_types = server_input_types,
|
|
.default_output_types = server_output_types,
|
|
.brick_construct = &server_brick_construct,
|
|
};
|
|
EXPORT_SYMBOL_GPL(server_brick_type);
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
// strategy layer
|
|
|
|
static int _server_thread(void *data)
|
|
{
|
|
char *id = my_id();
|
|
int status = 0;
|
|
|
|
//fake_mm();
|
|
|
|
MARS_INF("-------- server starting on host '%s' ----------\n", id);
|
|
|
|
while (!kthread_should_stop()) {
|
|
struct server_brick *brick;
|
|
struct mars_socket *new_socket;
|
|
|
|
new_socket = mars_accept_socket(server_socket, false);
|
|
if (IS_ERR(new_socket)) {
|
|
status = PTR_ERR(new_socket);
|
|
new_socket = NULL;
|
|
msleep(500);
|
|
if (status == -EAGAIN)
|
|
continue; // without error message
|
|
MARS_WRN("accept status = %d\n", status);
|
|
msleep(4000);
|
|
continue;
|
|
}
|
|
|
|
MARS_DBG("got new connection %p\n", new_socket);
|
|
|
|
/* TODO: check authorization.
|
|
*/
|
|
|
|
if (!mars_global || !mars_global->global_power.button) {
|
|
MARS_WRN("system is not alive\n");
|
|
goto err;
|
|
}
|
|
|
|
brick = (void*)mars_make_brick(mars_global, NULL, true, &server_brick_type, "server", "server");
|
|
if (!brick) {
|
|
MARS_ERR("cannot create server instance\n");
|
|
goto err;
|
|
}
|
|
|
|
brick->handler_socket = new_socket;
|
|
|
|
brick->power.button = true;
|
|
status = server_switch(brick);
|
|
if (status < 0) {
|
|
MARS_ERR("cannot switch on server brick, status = %d\n", status);
|
|
goto err;
|
|
}
|
|
|
|
continue;
|
|
|
|
err:
|
|
if (new_socket) {
|
|
mars_put_socket(new_socket);
|
|
}
|
|
msleep(3000);
|
|
}
|
|
|
|
MARS_INF("-------- cleaning up ----------\n");
|
|
|
|
spin_lock(&server_lock);
|
|
while (!list_empty(&server_list)) {
|
|
struct list_head *tmp = server_list.next;
|
|
struct server_brick *brick = container_of(tmp, struct server_brick, server_link);
|
|
list_del_init(tmp);
|
|
brick->self_shutdown = false;
|
|
spin_unlock(&server_lock);
|
|
|
|
MARS_INF("cleanup ....\n");
|
|
|
|
status = mars_kill_brick((void*)brick);
|
|
if (status < 0) {
|
|
BRICK_ERR("kill status = %d, giving up\n", status);
|
|
}
|
|
|
|
spin_lock(&server_lock);
|
|
}
|
|
spin_unlock(&server_lock);
|
|
|
|
//cleanup_mm();
|
|
|
|
MARS_INF("-------- done status = %d ----------\n", status);
|
|
return status;
|
|
}
|
|
|
|
////////////////// module init stuff /////////////////////////
|
|
|
|
int __init init_mars_server(void)
|
|
{
|
|
struct sockaddr_storage sockaddr = {};
|
|
struct task_struct *thread;
|
|
int status;
|
|
|
|
MARS_INF("init_server()\n");
|
|
|
|
#if 1
|
|
status = mars_create_sockaddr(&sockaddr, "");
|
|
if (status < 0)
|
|
return status;
|
|
|
|
server_socket = mars_create_socket(&sockaddr, true);
|
|
if (unlikely(IS_ERR(server_socket))) {
|
|
status = PTR_ERR(server_socket);
|
|
server_socket = NULL;
|
|
return status;
|
|
}
|
|
|
|
thread = kthread_create(_server_thread, NULL, "mars_server");
|
|
if (IS_ERR(thread)) {
|
|
status = PTR_ERR(thread);
|
|
return status;
|
|
}
|
|
|
|
get_task_struct(thread);
|
|
server_thread = thread;
|
|
wake_up_process(thread);
|
|
#endif
|
|
|
|
return server_register_brick_type();
|
|
}
|
|
|
|
void __exit exit_mars_server(void)
|
|
{
|
|
MARS_INF("exit_server()\n");
|
|
server_unregister_brick_type();
|
|
if (server_thread) {
|
|
if (server_socket) {
|
|
mars_shutdown_socket(server_socket);
|
|
}
|
|
MARS_INF("stopping server thread...\n");
|
|
kthread_stop(server_thread);
|
|
if (server_socket) {
|
|
mars_put_socket(server_socket);
|
|
server_socket = NULL;
|
|
}
|
|
put_task_struct(server_thread);
|
|
server_thread = NULL;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_MARS_HAVE_BIGMODULE
|
|
MODULE_DESCRIPTION("MARS server brick");
|
|
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_mars_server);
|
|
module_exit(exit_mars_server);
|
|
#endif
|