mirror of https://github.com/schoebel/mars
729 lines
19 KiB
C
729 lines
19 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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// Client 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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#include "mars.h"
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///////////////////////// own type definitions ////////////////////////
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#include "mars_client.h"
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///////////////////////// own helper functions ////////////////////////
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static int thread_count = 0;
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static void _kill_thread(struct client_threadinfo *ti)
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{
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if (ti->thread) {
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MARS_INF("stopping thread...\n");
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kthread_stop(ti->thread);
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put_task_struct(ti->thread);
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ti->thread = NULL;
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}
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}
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static void _kill_socket(struct client_output *output)
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{
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if (mars_socket_is_alive(&output->socket)) {
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MARS_DBG("shutdown socket\n");
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mars_shutdown_socket(&output->socket);
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}
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_kill_thread(&output->receiver);
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MARS_DBG("close socket\n");
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mars_put_socket(&output->socket);
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}
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static int _request_info(struct client_output *output)
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{
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struct mars_cmd cmd = {
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.cmd_code = CMD_GETINFO,
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};
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int status;
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MARS_DBG("\n");
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status = mars_send_struct(&output->socket, &cmd, mars_cmd_meta);
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if (unlikely(status < 0)) {
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MARS_DBG("send of getinfo failed, status = %d\n", status);
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}
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return status;
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}
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static int receiver_thread(void *data);
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static int _connect(struct client_output *output, const char *str)
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{
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struct sockaddr_storage sockaddr = {};
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int status;
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if (unlikely(!output->path)) {
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output->path = brick_strdup(str);
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status = -ENOMEM;
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if (!output->path) {
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MARS_DBG("no mem\n");
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goto done;
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}
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status = -EINVAL;
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output->host = strchr(output->path, '@');
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if (!output->host) {
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brick_string_free(output->path);
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output->path = NULL;
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MARS_ERR("parameter string '%s' contains no remote specifier with '@'-syntax\n", str);
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goto done;
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}
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*output->host++ = '\0';
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}
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status = mars_create_sockaddr(&sockaddr, output->host);
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if (unlikely(status < 0)) {
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MARS_DBG("no sockaddr, status = %d\n", status);
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goto done;
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}
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status = mars_create_socket(&output->socket, &sockaddr, false);
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if (unlikely(status < 0)) {
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MARS_DBG("no socket, status = %d\n", status);
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goto really_done;
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}
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output->socket.s_shutdown_on_err = true;
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output->receiver.thread = kthread_create(receiver_thread, output, "mars_receiver%d", thread_count++);
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if (unlikely(IS_ERR(output->receiver.thread))) {
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status = PTR_ERR(output->receiver.thread);
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MARS_ERR("cannot start receiver thread, status = %d\n", status);
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output->receiver.thread = NULL;
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output->receiver.terminated = true;
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goto done;
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}
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get_task_struct(output->receiver.thread);
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wake_up_process(output->receiver.thread);
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{
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struct mars_cmd cmd = {
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.cmd_code = CMD_CONNECT,
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.cmd_str1 = output->path,
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};
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status = mars_send_struct(&output->socket, &cmd, mars_cmd_meta);
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if (unlikely(status < 0)) {
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MARS_DBG("send of connect failed, status = %d\n", status);
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goto done;
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}
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}
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if (status >= 0) {
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status = _request_info(output);
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}
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done:
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if (status < 0) {
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MARS_INF("cannot connect to remote host '%s' (status = %d) -- retrying\n", output->host ? output->host : "NULL", status);
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_kill_socket(output);
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}
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really_done:
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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 client_get_info(struct client_output *output, struct mars_info *info)
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{
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int status;
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output->got_info = false;
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output->get_info = true;
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wake_up_interruptible(&output->event);
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wait_event_interruptible_timeout(output->info_event, output->got_info, 60 * HZ);
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status = -EIO;
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if (output->got_info && info) {
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memcpy(info, &output->info, sizeof(*info));
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status = 0;
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}
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//done:
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return status;
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}
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static int client_ref_get(struct client_output *output, struct mref_object *mref)
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{
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#if 1
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/* Limit transfers to page boundaries.
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* Currently, this is more restrictive than necessary.
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* TODO: improve performance by doing better when possible.
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* This needs help from the server in some efficient way.
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*/
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int maxlen = PAGE_SIZE - (mref->ref_pos & (PAGE_SIZE-1));
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if (mref->ref_len > maxlen)
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mref->ref_len = maxlen;
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#endif
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_CHECK_ATOMIC(&mref->ref_count, !=, 0);
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if (!mref->ref_data) { // buffered IO
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struct client_mref_aspect *mref_a = client_mref_get_aspect(output->brick, mref);
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if (!mref_a)
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return -EILSEQ;
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mref->ref_data = brick_block_alloc(mref->ref_pos, (mref_a->alloc_len = mref->ref_len));
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if (!mref->ref_data)
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return -ENOMEM;
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mref_a->do_dealloc = true;
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mref->ref_flags = 0;
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}
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atomic_inc(&mref->ref_count);
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return 0;
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}
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static void client_ref_put(struct client_output *output, struct mref_object *mref)
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{
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struct client_mref_aspect *mref_a;
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CHECK_ATOMIC(&mref->ref_count, 1);
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if (!atomic_dec_and_test(&mref->ref_count))
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return;
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mref_a = client_mref_get_aspect(output->brick, mref);
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if (mref_a && mref_a->do_dealloc) {
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brick_block_free(mref->ref_data, mref_a->alloc_len);
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}
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client_free_mref(mref);
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}
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static void client_ref_io(struct client_output *output, struct mref_object *mref)
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{
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struct client_mref_aspect *mref_a;
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int hash_index;
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unsigned long flags;
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int error = -EINVAL;
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mref_a = client_mref_get_aspect(output->brick, mref);
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if (unlikely(!mref_a)) {
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goto error;
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}
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while (output->brick->max_flying > 0 && atomic_read(&output->fly_count) > output->brick->max_flying) {
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MARS_IO("sleeping request pos = %lld len = %d rw = %d (flying = %d)\n", mref->ref_pos, mref->ref_len, mref->ref_rw, atomic_read(&output->fly_count));
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#ifdef IO_DEBUGGING
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msleep(3000);
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#else
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msleep(1000 * 2 / HZ);
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#endif
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}
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atomic_inc(&output->fly_count);
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atomic_inc(&mref->ref_count);
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traced_lock(&output->lock, flags);
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mref_a->submit_jiffies = jiffies;
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mref->ref_id = ++output->last_id;
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list_add_tail(&mref_a->io_head, &output->mref_list);
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traced_unlock(&output->lock, flags);
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hash_index = mref->ref_id % CLIENT_HASH_MAX;
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traced_lock(&output->hash_lock[hash_index], flags);
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list_add_tail(&mref_a->hash_head, &output->hash_table[hash_index]);
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traced_unlock(&output->hash_lock[hash_index], flags);
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MARS_IO("added request id = %d pos = %lld len = %d rw = %d (flying = %d)\n", mref->ref_id, mref->ref_pos, mref->ref_len, mref->ref_rw, atomic_read(&output->fly_count));
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wake_up_interruptible(&output->event);
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return;
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error:
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MARS_ERR("IO error = %d\n", error);
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SIMPLE_CALLBACK(mref, error);
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client_ref_put(output, mref);
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}
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static
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int receiver_thread(void *data)
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{
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struct client_output *output = data;
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int status = 0;
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while (status >= 0 && mars_socket_is_alive(&output->socket) && !kthread_should_stop()) {
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struct mars_cmd cmd = {};
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struct list_head *tmp;
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struct client_mref_aspect *mref_a = NULL;
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struct mref_object *mref = NULL;
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unsigned long flags;
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status = mars_recv_struct(&output->socket, &cmd, mars_cmd_meta);
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MARS_IO("got cmd = %d status = %d\n", cmd.cmd_code, status);
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if (status < 0)
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goto done;
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switch (cmd.cmd_code & CMD_FLAG_MASK) {
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case CMD_NOTIFY:
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mars_trigger();
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break;
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case CMD_CONNECT:
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if (cmd.cmd_int1 < 0) {
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status = cmd.cmd_int1;
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MARS_ERR("at remote side: brick connect failed, remote status = %d\n", status);
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goto done;
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}
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break;
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case CMD_CB:
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{
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int hash_index = cmd.cmd_int1 % CLIENT_HASH_MAX;
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traced_lock(&output->hash_lock[hash_index], flags);
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for (tmp = output->hash_table[hash_index].next; tmp != &output->hash_table[hash_index]; tmp = tmp->next) {
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struct mref_object *tmp_mref;
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mref_a = container_of(tmp, struct client_mref_aspect, hash_head);
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tmp_mref = mref_a->object;
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if (unlikely(!tmp_mref)) {
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traced_unlock(&output->hash_lock[hash_index], flags);
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MARS_ERR("bad internal mref pointer\n");
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status = -EBADR;
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goto done;
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}
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if (tmp_mref->ref_id == cmd.cmd_int1) {
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mref = tmp_mref;
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break;
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}
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}
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traced_unlock(&output->hash_lock[hash_index], flags);
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if (!mref) {
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MARS_ERR("got unknown id = %d for callback\n", cmd.cmd_int1);
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status = -EBADR;
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goto done;
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}
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MARS_IO("got callback id = %d, old pos = %lld len = %d rw = %d\n", mref->ref_id, mref->ref_pos, mref->ref_len, mref->ref_rw);
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status = mars_recv_cb(&output->socket, mref, &cmd);
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MARS_IO("new status = %d, pos = %lld len = %d rw = %d\n", status, mref->ref_pos, mref->ref_len, mref->ref_rw);
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if (status < 0) {
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MARS_WRN("interrupted data transfer during callback, status = %d\n", status);
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goto done;
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}
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traced_lock(&output->hash_lock[hash_index], flags);
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list_del_init(&mref_a->hash_head);
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traced_unlock(&output->hash_lock[hash_index], flags);
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traced_lock(&output->lock, flags);
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list_del_init(&mref_a->io_head);
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traced_unlock(&output->lock, flags);
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atomic_dec(&output->fly_count);
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SIMPLE_CALLBACK(mref, 0);
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client_ref_put(output, mref);
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break;
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}
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case CMD_GETINFO:
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status = mars_recv_struct(&output->socket, &output->info, mars_info_meta);
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if (status < 0) {
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MARS_WRN("got bad info from remote side, status = %d\n", status);
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goto done;
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}
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output->got_info = true;
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wake_up_interruptible(&output->info_event);
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break;
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default:
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MARS_ERR("got bad command %d from remote side, terminating.\n", cmd.cmd_code);
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status = -EBADR;
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goto done;
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}
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done:
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brick_string_free(cmd.cmd_str1);
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}
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if (status < 0) {
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MARS_WRN("receiver thread terminated with status = %d\n", status);
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}
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mars_shutdown_socket(&output->socket);
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output->receiver.terminated = true;
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wake_up_interruptible(&output->receiver.run_event);
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return status;
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}
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static
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void _do_resubmit(struct client_output *output)
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{
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if (!list_empty(&output->wait_list)) {
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struct list_head *first = output->wait_list.next;
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struct list_head *last = output->wait_list.prev;
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struct list_head *old_start = output->mref_list.next;
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#define list_connect __list_del // the original routine has a misleading name: in reality it is more general
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list_connect(&output->mref_list, first);
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list_connect(last, old_start);
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INIT_LIST_HEAD(&output->wait_list);
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MARS_IO("done re-submit %p %p\n", first, last);
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}
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}
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static
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void _do_timeout(struct client_output *output, struct list_head *anchor, bool force)
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{
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struct client_brick *brick = output->brick;
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while (!list_empty(anchor)) {
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struct list_head *tmp;
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struct client_mref_aspect *mref_a;
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struct mref_object *mref;
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int hash_index;
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unsigned long flags;
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traced_lock(&output->lock, flags);
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tmp = anchor->next;
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traced_unlock(&output->lock, flags);
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mref_a = container_of(tmp, struct client_mref_aspect, io_head);
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mref = mref_a->object;
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if (!force &&
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(brick->io_timeout <= 0 || !time_is_before_jiffies(mref_a->submit_jiffies + brick->io_timeout * HZ))) {
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break;
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}
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MARS_DBG("signalling IO error at pos = %lld len = %d\n", mref->ref_pos, mref->ref_len);
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atomic_inc(&output->timeout_count);
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hash_index = mref->ref_id % CLIENT_HASH_MAX;
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traced_lock(&output->hash_lock[hash_index], flags);
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list_del_init(&mref_a->hash_head);
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traced_unlock(&output->hash_lock[hash_index], flags);
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traced_lock(&output->lock, flags);
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list_del_init(&mref_a->io_head);
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traced_unlock(&output->lock, flags);
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SIMPLE_CALLBACK(mref, -ENOTCONN);
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client_ref_put(output, mref);
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atomic_dec(&output->fly_count);
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}
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}
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static int sender_thread(void *data)
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{
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struct client_output *output = data;
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struct client_brick *brick = output->brick;
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unsigned long flags;
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bool do_kill = false;
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int status = 0;
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output->receiver.restart_count = 0;
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while (!kthread_should_stop()) {
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struct list_head *tmp = NULL;
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struct client_mref_aspect *mref_a;
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struct mref_object *mref;
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bool do_resubmit = false;
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if (unlikely(!mars_socket_is_alive(&output->socket))) {
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if (do_kill) {
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do_kill = false;
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_kill_socket(output);
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msleep(3000);
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}
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status = _connect(output, brick->brick_name);
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MARS_IO("connect status = %d\n", status);
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if (unlikely(status < 0)) {
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_do_timeout(output, &output->wait_list, false);
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_do_timeout(output, &output->mref_list, false);
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msleep(3000);
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continue;
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}
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do_kill = true;
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do_resubmit = true;
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}
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if (do_resubmit) {
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/* Re-Submit any waiting requests
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*/
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MARS_IO("re-submit\n");
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traced_lock(&output->lock, flags);
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_do_resubmit(output);
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traced_unlock(&output->lock, flags);
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}
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wait_event_interruptible_timeout(output->event, !list_empty(&output->mref_list) || output->get_info || kthread_should_stop(), 1 * HZ);
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if (output->get_info) {
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status = _request_info(output);
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if (status >= 0) {
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output->get_info = false;
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} else {
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MARS_WRN("cannot get info, status = %d\n", status);
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msleep(1000);
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}
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}
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if (list_empty(&output->mref_list))
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continue;
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traced_lock(&output->lock, flags);
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tmp = output->mref_list.next;
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traced_unlock(&output->lock, flags);
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mref_a = container_of(tmp, struct client_mref_aspect, io_head);
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mref = mref_a->object;
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if (brick->limit_mode) {
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int amount = 0;
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if (mref->ref_cs_mode < 2)
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amount = (mref->ref_len - 1) / 1024 + 1;
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mars_limit_sleep(&client_limiter, amount);
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}
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MARS_IO("sending mref, id = %d pos = %lld len = %d rw = %d\n", mref->ref_id, mref->ref_pos, mref->ref_len, mref->ref_rw);
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status = mars_send_mref(&output->socket, mref);
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MARS_IO("status = %d\n", status);
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if (unlikely(status < 0)) {
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// retry submission on next occasion..
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MARS_WRN("sending failed, status = %d\n", status);
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if (do_kill) {
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do_kill = false;
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_kill_socket(output);
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}
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msleep(3000);
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continue;
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}
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// all ok, remember in-flight mrefs
|
|
traced_lock(&output->lock, flags);
|
|
list_del(tmp);
|
|
list_add(tmp, &output->wait_list);
|
|
traced_unlock(&output->lock, flags);
|
|
}
|
|
//done:
|
|
if (status < 0) {
|
|
MARS_WRN("sender thread terminated with status = %d\n", status);
|
|
}
|
|
|
|
if (do_kill) {
|
|
_kill_socket(output);
|
|
}
|
|
|
|
/* Signal error on all pending IO requests.
|
|
* We have no other chance (except probably delaying
|
|
* this until destruction which is probably not what
|
|
* we want).
|
|
*/
|
|
_do_timeout(output, &output->wait_list, true);
|
|
_do_timeout(output, &output->mref_list, true);
|
|
|
|
output->sender.terminated = true;
|
|
wake_up_interruptible(&output->sender.run_event);
|
|
MARS_DBG("sender terminated\n");
|
|
return status;
|
|
}
|
|
|
|
static int client_switch(struct client_brick *brick)
|
|
{
|
|
struct client_output *output = brick->outputs[0];
|
|
int status = 0;
|
|
|
|
if (brick->power.button) {
|
|
mars_power_led_off((void*)brick, false);
|
|
if (output->sender.terminated) {
|
|
output->sender.terminated = false;
|
|
output->sender.thread = kthread_create(sender_thread, output, "mars_sender%d", thread_count++);
|
|
if (unlikely(IS_ERR(output->sender.thread))) {
|
|
status = PTR_ERR(output->sender.thread);
|
|
MARS_ERR("cannot start sender thread, status = %d\n", status);
|
|
output->sender.thread = NULL;
|
|
output->sender.terminated = true;
|
|
goto done;
|
|
}
|
|
}
|
|
get_task_struct(output->sender.thread);
|
|
wake_up_process(output->sender.thread);
|
|
if (!output->sender.terminated) {
|
|
mars_power_led_on((void*)brick, true);
|
|
}
|
|
} else {
|
|
mars_power_led_on((void*)brick, false);
|
|
_kill_thread(&output->sender);
|
|
wait_event_interruptible_timeout(output->sender.run_event, output->sender.terminated, 10 * HZ);
|
|
if (output->sender.terminated) {
|
|
mars_power_led_off((void*)brick, !output->sender.thread);
|
|
}
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
|
|
//////////////// informational / statistics ///////////////
|
|
|
|
static
|
|
char *client_statistics(struct client_brick *brick, int verbose)
|
|
{
|
|
struct client_output *output = brick->outputs[0];
|
|
char *res = brick_string_alloc(1024);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
snprintf(res, 1024,
|
|
"#%d socket "
|
|
"max_flying = %d "
|
|
"io_timeout = %d | "
|
|
"timeout_count = %d "
|
|
"fly_count = %d\n",
|
|
output->socket.s_debug_nr,
|
|
brick->max_flying,
|
|
brick->io_timeout,
|
|
atomic_read(&output->timeout_count),
|
|
atomic_read(&output->fly_count));
|
|
|
|
return res;
|
|
}
|
|
|
|
static
|
|
void client_reset_statistics(struct client_brick *brick)
|
|
{
|
|
struct client_output *output = brick->outputs[0];
|
|
atomic_set(&output->timeout_count, 0);
|
|
}
|
|
|
|
//////////////// object / aspect constructors / destructors ///////////////
|
|
|
|
static int client_mref_aspect_init_fn(struct generic_aspect *_ini)
|
|
{
|
|
struct client_mref_aspect *ini = (void*)_ini;
|
|
INIT_LIST_HEAD(&ini->io_head);
|
|
INIT_LIST_HEAD(&ini->hash_head);
|
|
return 0;
|
|
}
|
|
|
|
static void client_mref_aspect_exit_fn(struct generic_aspect *_ini)
|
|
{
|
|
struct client_mref_aspect *ini = (void*)_ini;
|
|
CHECK_HEAD_EMPTY(&ini->io_head);
|
|
CHECK_HEAD_EMPTY(&ini->hash_head);
|
|
}
|
|
|
|
MARS_MAKE_STATICS(client);
|
|
|
|
////////////////////// brick constructors / destructors ////////////////////
|
|
|
|
static int client_brick_construct(struct client_brick *brick)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int client_output_construct(struct client_output *output)
|
|
{
|
|
int i;
|
|
for (i = 0; i < CLIENT_HASH_MAX; i++) {
|
|
spin_lock_init(&output->hash_lock[i]);
|
|
INIT_LIST_HEAD(&output->hash_table[i]);
|
|
}
|
|
spin_lock_init(&output->lock);
|
|
INIT_LIST_HEAD(&output->mref_list);
|
|
INIT_LIST_HEAD(&output->wait_list);
|
|
init_waitqueue_head(&output->event);
|
|
init_waitqueue_head(&output->sender.run_event);
|
|
init_waitqueue_head(&output->receiver.run_event);
|
|
init_waitqueue_head(&output->info_event);
|
|
output->sender.terminated = true;
|
|
output->receiver.terminated = true;
|
|
return 0;
|
|
}
|
|
|
|
static int client_output_destruct(struct client_output *output)
|
|
{
|
|
if (output->path) {
|
|
brick_string_free(output->path);
|
|
output->path = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
///////////////////////// static structs ////////////////////////
|
|
|
|
static struct client_brick_ops client_brick_ops = {
|
|
.brick_switch = client_switch,
|
|
.brick_statistics = client_statistics,
|
|
.reset_statistics = client_reset_statistics,
|
|
};
|
|
|
|
static struct client_output_ops client_output_ops = {
|
|
.mars_get_info = client_get_info,
|
|
.mref_get = client_ref_get,
|
|
.mref_put = client_ref_put,
|
|
.mref_io = client_ref_io,
|
|
};
|
|
|
|
const struct client_input_type client_input_type = {
|
|
.type_name = "client_input",
|
|
.input_size = sizeof(struct client_input),
|
|
};
|
|
|
|
static const struct client_input_type *client_input_types[] = {
|
|
&client_input_type,
|
|
};
|
|
|
|
const struct client_output_type client_output_type = {
|
|
.type_name = "client_output",
|
|
.output_size = sizeof(struct client_output),
|
|
.master_ops = &client_output_ops,
|
|
.output_construct = &client_output_construct,
|
|
.output_destruct = &client_output_destruct,
|
|
};
|
|
|
|
static const struct client_output_type *client_output_types[] = {
|
|
&client_output_type,
|
|
};
|
|
|
|
const struct client_brick_type client_brick_type = {
|
|
.type_name = "client_brick",
|
|
.brick_size = sizeof(struct client_brick),
|
|
.max_inputs = 0,
|
|
.max_outputs = 1,
|
|
.master_ops = &client_brick_ops,
|
|
.aspect_types = client_aspect_types,
|
|
.default_input_types = client_input_types,
|
|
.default_output_types = client_output_types,
|
|
.brick_construct = &client_brick_construct,
|
|
};
|
|
EXPORT_SYMBOL_GPL(client_brick_type);
|
|
|
|
////////////////// module init stuff /////////////////////////
|
|
|
|
struct mars_limiter client_limiter = {
|
|
.lim_max_rate = 0,
|
|
};
|
|
EXPORT_SYMBOL_GPL(client_limiter);
|
|
|
|
int __init init_mars_client(void)
|
|
{
|
|
MARS_INF("init_client()\n");
|
|
_client_brick_type = (void*)&client_brick_type;
|
|
return client_register_brick_type();
|
|
}
|
|
|
|
void __exit exit_mars_client(void)
|
|
{
|
|
MARS_INF("exit_client()\n");
|
|
client_unregister_brick_type();
|
|
}
|
|
|
|
#ifndef CONFIG_MARS_HAVE_BIGMODULE
|
|
MODULE_DESCRIPTION("MARS client brick");
|
|
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_mars_client);
|
|
module_exit(exit_mars_client);
|
|
#endif
|