mirror of
https://github.com/schoebel/mars
synced 2024-12-09 08:20:10 +00:00
361 lines
9.0 KiB
C
361 lines
9.0 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* Check brick
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* checks various semantic properties, uses watchdog to find lost callbacks.
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*/
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/* FIXME: this code has been unused for a long time, it is unlikly
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* to work at all.
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*/
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/* FIXME: improve this a lot!
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* Check really _anything_ in the interface which _could_ go wrong,
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* even by the silliest type of accident!
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*/
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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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//#define STAT_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 "mars.h"
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///////////////////////// own type definitions ////////////////////////
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#include "mars_check.h"
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///////////////////////// own helper functions ////////////////////////
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#define CHECK_ERR(output,fmt,args...) \
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do { \
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struct check_input *input = (output)->brick->inputs[0]; \
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struct generic_output *other = (void*)input->connect; \
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if (other) { \
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MARS_ERR("instance %d/%s/%s: " fmt, \
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(output)->instance_nr, \
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other->type->type_name, \
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other->output_name, \
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##args); \
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} else { \
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MARS_ERR("instance %d: " fmt, \
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(output)->instance_nr, \
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##args); \
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} \
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} while (0)
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static void check_endio(struct generic_callback *cb)
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{
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struct check_mref_aspect *mref_a;
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struct mref_object *mref;
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struct check_output *output;
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struct check_input *input;
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unsigned long flags;
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mref_a = cb->cb_private;
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CHECK_PTR(mref_a, fatal);
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_CHECK(&mref_a->cb == cb, fatal);
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mref = mref_a->object;
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CHECK_PTR(mref, fatal);
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output = mref_a->output;
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CHECK_PTR(output, fatal);
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input = output->brick->inputs[0];
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CHECK_PTR(input, fatal);
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if (atomic_dec_and_test(&mref_a->callback_count)) {
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atomic_set(&mref_a->callback_count, 1);
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CHECK_ERR(output, "too many callbacks on %p\n", mref);
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}
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#ifdef CHECK_LOCK
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traced_lock(&output->check_lock, flags);
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if (list_empty(&mref_a->mref_head)) {
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CHECK_ERR(output, "list entry missing on %p\n", mref);
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}
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list_del_init(&mref_a->mref_head);
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traced_unlock(&output->check_lock, flags);
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#else
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(void)flags;
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#endif
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mref_a->last_jiffies = jiffies;
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NEXT_CHECKED_CALLBACK(cb, fatal);
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return;
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fatal:
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brick_msleep(60000);
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return;
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}
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#ifdef CHECK_LOCK
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static void dump_mem(void *data, int len)
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{
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int i;
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char *tmp;
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char *buf = brick_string_alloc(0);
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if (!buf)
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return;
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for (i = 0, tmp = buf; i < len; i++) {
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unsigned char byte = ((unsigned char*)data)[i];
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if (!(i % 8)) {
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if (tmp != buf) {
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say(-1, "%4d: %s\n", i, buf);
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}
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tmp = buf;
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}
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tmp += scnprintf(tmp, 1024 - i * 3, " %02x", byte);
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}
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if (tmp != buf) {
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say(-1, "%4d: %s\n", i, buf);
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}
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brick_string_free(buf);
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}
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static int check_watchdog(void *data)
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{
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struct check_output *output = data;
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MARS_INF("watchdog has started.\n");
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while (!brick_thread_should_stop()) {
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struct list_head *h;
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unsigned long flags;
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unsigned long now;
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brick_msleep(5000);
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traced_lock(&output->check_lock, flags);
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now = jiffies;
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for (h = output->mref_anchor.next; h != &output->mref_anchor; h = h->next) {
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static int limit = 1;
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const int timeout = 30;
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struct check_mref_aspect *mref_a;
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struct mref_object *mref;
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unsigned long elapsed;
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mref_a = container_of(h, struct check_mref_aspect, mref_head);
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mref = mref_a->object;
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elapsed = now - mref_a->last_jiffies;
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if (elapsed > timeout * HZ && limit-- > 0) {
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struct generic_object_layout *object_layout;
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mref_a->last_jiffies = now + 600 * HZ;
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MARS_INF("================================\n");
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CHECK_ERR(output, "mref %p callback is missing for more than %d seconds.\n", mref, timeout);
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object_layout = mref->object_layout;
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dump_mem(mref, object_layout->size_hint);
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MARS_INF("================================\n");
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}
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}
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traced_unlock(&output->check_lock, flags);
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}
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return 0;
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}
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#endif
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////////////////// own brick / input / output operations //////////////////
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static int check_get_info(struct check_output *output, struct mars_info *info)
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{
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struct check_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 check_ref_get(struct check_output *output, struct mref_object *mref)
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{
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struct check_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 check_ref_put(struct check_output *output, struct mref_object *mref)
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{
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struct check_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 check_ref_io(struct check_output *output, struct mref_object *mref)
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{
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struct check_input *input = output->brick->inputs[0];
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struct check_mref_aspect *mref_a = check_mref_get_aspect(output->brick, mref);
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unsigned long flags;
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CHECK_PTR(mref_a, fatal);
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if (atomic_dec_and_test(&mref_a->call_count)) {
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atomic_set(&mref_a->call_count, 1);
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CHECK_ERR(output, "multiple parallel calls on %p\n", mref);
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}
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atomic_set(&mref_a->callback_count, 2);
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#ifdef CHECK_LOCK
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traced_lock(&output->check_lock, flags);
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if (!list_empty(&mref_a->mref_head)) {
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CHECK_ERR(output, "list head not empty on %p\n", mref);
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list_del(&mref_a->mref_head);
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}
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list_add_tail(&mref_a->mref_head, &output->mref_anchor);
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traced_unlock(&output->check_lock, flags);
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#else
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(void)flags;
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#endif
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mref_a->last_jiffies = jiffies;
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if (!mref_a->installed) {
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mref_a->installed = true;
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mref_a->output = output;
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INSERT_CALLBACK(mref, &mref_a->cb, check_endio, mref_a);
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}
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GENERIC_INPUT_CALL(input, mref_io, mref);
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atomic_inc(&mref_a->call_count);
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fatal: ;
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}
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//////////////// object / aspect constructors / destructors ///////////////
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static int check_mref_aspect_init_fn(struct generic_aspect *_ini)
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{
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struct check_mref_aspect *ini = (void*)_ini;
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#ifdef CHECK_LOCK
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INIT_LIST_HEAD(&ini->mref_head);
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#endif
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ini->last_jiffies = jiffies;
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atomic_set(&ini->call_count, 2);
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atomic_set(&ini->callback_count, 1);
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ini->installed = false;
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return 0;
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}
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static void check_mref_aspect_exit_fn(struct generic_aspect *_ini)
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{
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struct check_mref_aspect *ini = (void*)_ini;
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(void)ini;
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#ifdef CHECK_LOCK
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if (!list_empty(&ini->mref_head)) {
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struct check_output *output = ini->output;
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if (output) {
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CHECK_ERR(output, "list head not empty on %p\n", ini->object);
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INIT_LIST_HEAD(&ini->mref_head);
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} else {
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CHECK_HEAD_EMPTY(&ini->mref_head);
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}
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}
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#endif
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}
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MARS_MAKE_STATICS(check);
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////////////////////// brick constructors / destructors ////////////////////
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static int check_brick_construct(struct check_brick *brick)
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{
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return 0;
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}
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static int check_output_construct(struct check_output *output)
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{
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static int count = 0;
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#ifdef CHECK_LOCK
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spin_lock_init(&output->check_lock);
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INIT_LIST_HEAD(&output->mref_anchor);
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output->watchdog = brick_thread_create(check_watchdog, output, "check_watchdog%d", output->instance_nr);
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#endif
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output->instance_nr = ++count;
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return 0;
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}
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///////////////////////// static structs ////////////////////////
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static struct check_brick_ops check_brick_ops = {
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};
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static struct check_output_ops check_output_ops = {
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.mars_get_info = check_get_info,
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.mref_get = check_ref_get,
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.mref_put = check_ref_put,
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.mref_io = check_ref_io,
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};
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const struct check_input_type check_input_type = {
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.type_name = "check_input",
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.input_size = sizeof(struct check_input),
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};
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static const struct check_input_type *check_input_types[] = {
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&check_input_type,
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};
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const struct check_output_type check_output_type = {
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.type_name = "check_output",
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.output_size = sizeof(struct check_output),
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.master_ops = &check_output_ops,
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.output_construct = &check_output_construct,
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};
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static const struct check_output_type *check_output_types[] = {
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&check_output_type,
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};
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const struct check_brick_type check_brick_type = {
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.type_name = "check_brick",
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.brick_size = sizeof(struct check_brick),
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.max_inputs = 1,
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.max_outputs = 1,
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.master_ops = &check_brick_ops,
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.aspect_types = check_aspect_types,
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.default_input_types = check_input_types,
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.default_output_types = check_output_types,
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.brick_construct = &check_brick_construct,
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};
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EXPORT_SYMBOL_GPL(check_brick_type);
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////////////////// module init stuff /////////////////////////
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int __init init_mars_check(void)
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{
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MARS_INF("init_check()\n");
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return check_register_brick_type();
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}
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void exit_mars_check(void)
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{
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MARS_INF("exit_check()\n");
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check_unregister_brick_type();
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}
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