Message-Id: <3004502595422a867632b63a83a881a7d56eccc6.1451558672.git.tst@schoebel-theuer.de>
Date:	Thu, 31 Dec 2015 12:36:22 +0100
From:	Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To:	linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 27/31] mars: add new module mars_proc

Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
 drivers/staging/mars/mars_light/mars_proc.c | 369 ++++++++++++++++++++++++++++
 include/linux/mars_light/mars_proc.h        |  34 +++
 2 files changed, 403 insertions(+)
 create mode 100644 drivers/staging/mars/mars_light/mars_proc.c
 create mode 100644 include/linux/mars_light/mars_proc.h

diff --git a/drivers/staging/mars/mars_light/mars_proc.c b/drivers/staging/mars/mars_light/mars_proc.c
new file mode 100644
index 0000000..2a96614
--- /dev/null
+++ b/drivers/staging/mars/mars_light/mars_proc.c
@@ -0,0 +1,369 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <linux/sysctl.h>
+#include <linux/uaccess.h>
+
+#include <linux/mars_light/light_strategy.h>
+#include <linux/mars_light/mars_proc.h>
+#include <linux/xio/lib_mapfree.h>
+#include <linux/xio/xio_bio.h>
+#include <linux/xio/xio_if.h>
+#include <linux/xio/xio_copy.h>
+#include <linux/xio/xio_client.h>
+#include <linux/xio/xio_server.h>
+#include <linux/xio/xio_trans_logger.h>
+
+xio_info_fn xio_info;
+
+static
+int trigger_sysctl_handler(
+	struct ctl_table *table,
+	int write,
+	void __user *buffer,
+	size_t *length,
+	loff_t *ppos)
+{
+	ssize_t res = 0;
+	size_t len = *length;
+
+	XIO_DBG("write = %d len = %ld pos = %lld\n", write, len, *ppos);
+
+	if (!len || *ppos > 0)
+		goto done;
+
+	if (write) {
+		char tmp[8] = {};
+
+		res = len; /*  fake consumption of all data */
+
+		if (len > 7)
+			len = 7;
+		if (!copy_from_user(tmp, buffer, len)) {
+			int code = 0;
+			int status = kstrtoint(tmp, 10, &code);
+
+			/* the return value from ssanf() does not matter */
+			(void)status;
+			if (code > 0)
+				local_trigger();
+			if (code > 1)
+				remote_trigger();
+		}
+	} else {
+		char *answer = "MARS module not operational\n";
+		char *tmp = NULL;
+		int mylen;
+
+		if (xio_info) {
+			answer = "internal error while determining xio_info\n";
+			tmp = xio_info();
+			if (tmp)
+				answer = tmp;
+		}
+
+		mylen = strlen(answer);
+		if (len > mylen)
+			len = mylen;
+		res = len;
+		if (copy_to_user(buffer, answer, len)) {
+			XIO_ERR("write %ld bytes at %p failed\n", len, buffer);
+			res = -EFAULT;
+		}
+		brick_string_free(tmp);
+	}
+
+done:
+	XIO_DBG("res = %ld\n", res);
+	*length = res;
+	if (res >= 0) {
+		*ppos += res;
+		return 0;
+	}
+	return res;
+}
+
+static
+int lamport_sysctl_handler(
+	struct ctl_table *table,
+	int write,
+	void __user *buffer,
+	size_t *length,
+	loff_t *ppos)
+{
+	ssize_t res = 0;
+	size_t len = *length;
+
+	XIO_DBG("write = %d len = %ld pos = %lld\n", write, len, *ppos);
+
+	if (!len || *ppos > 0)
+		goto done;
+
+	if (write) {
+		return -EINVAL;
+	} else {
+		int my_len = 128;
+		char *tmp = brick_string_alloc(my_len);
+		struct timespec know = CURRENT_TIME;
+		struct timespec lnow;
+
+		get_lamport(&lnow);
+
+		res = scnprintf(tmp, my_len,
+			       "CURRENT_TIME=%ld.%09ld\nlamport_now=%ld.%09ld\n",
+			       know.tv_sec, know.tv_nsec,
+			       lnow.tv_sec, lnow.tv_nsec
+			);
+
+		if (copy_to_user(buffer, tmp, res)) {
+			XIO_ERR("write %ld bytes at %p failed\n", res, buffer);
+			res = -EFAULT;
+		}
+		brick_string_free(tmp);
+	}
+
+done:
+	XIO_DBG("res = %ld\n", res);
+	*length = res;
+	if (res >= 0) {
+		*ppos += res;
+		return 0;
+	}
+	return res;
+}
+
+#ifdef CTL_UNNUMBERED
+#define _CTL_NAME			.ctl_name = CTL_UNNUMBERED,
+#define _CTL_STRATEGY(handler)	.strategy = &handler,
+#else
+#define _CTL_NAME			/*empty*/
+#define _CTL_STRATEGY(handler)	/*empty*/
+#endif
+
+#define VEC_ENTRY(NAME, VAR, MODE, COUNT)				\
+	{								\
+		_CTL_NAME						\
+		.procname = NAME,					\
+		.data = &(VAR),						\
+		.maxlen = sizeof(int) * (COUNT),			\
+		.mode = MODE,						\
+		.proc_handler = &proc_dointvec,				\
+		_CTL_STRATEGY(sysctl_intvec)				\
+	}
+
+#define INT_ENTRY(NAME, VAR, MODE)					\
+	VEC_ENTRY(NAME, VAR, MODE, 1)
+
+/* checkpatch.pl: no, these complex values cannot be easily enclosed
+ * in parentheses. If { ... } were used inside the macro body, it would
+ * no longer be possible to add additional fields externally.
+ * I could inject further fields externally via parameters, but
+ * that would make it less understandable.
+ */
+#define LIMITER_ENTRIES(VAR, PREFIX, SUFFIX)				\
+	INT_ENTRY(PREFIX "_total_ops_" SUFFIX, (VAR)->lim_total_ops, 0400),\
+	INT_ENTRY(PREFIX "_total_sum_" SUFFIX, (VAR)->lim_total_sum, 0400),\
+	INT_ENTRY(PREFIX "_ratelimit_" SUFFIX, (VAR)->lim_max_rate, 0600),\
+	INT_ENTRY(PREFIX "_maxdelay_ms",   (VAR)->lim_max_delay, 0600), \
+	INT_ENTRY(PREFIX "_minwindow_ms",  (VAR)->lim_min_window, 0600),\
+	INT_ENTRY(PREFIX "_maxwindow_ms",  (VAR)->lim_max_window, 0600),\
+	INT_ENTRY(PREFIX "_cumul_" SUFFIX, (VAR)->lim_cumul,	0600),	\
+	INT_ENTRY(PREFIX "_count_ops",	   (VAR)->lim_count,	0600),	\
+	INT_ENTRY(PREFIX "_rate_"  SUFFIX, (VAR)->lim_rate,	0400)	\
+
+#define THRESHOLD_ENTRIES(VAR, PREFIX)					\
+	INT_ENTRY(PREFIX "_threshold_us",   (VAR)->thr_limit,	 0600), \
+	INT_ENTRY(PREFIX "_factor_percent", (VAR)->thr_factor,	 0600), \
+	INT_ENTRY(PREFIX "_plus_us",	    (VAR)->thr_plus,	 0600), \
+	INT_ENTRY(PREFIX "_max_ms",	    (VAR)->thr_max,	 0600), \
+	INT_ENTRY(PREFIX "_triggered",	    (VAR)->thr_triggered, 0400),\
+	INT_ENTRY(PREFIX "_true_hit",	    (VAR)->thr_true_hit, 0400)	\
+
+static
+struct ctl_table traffic_tuning_table[] = {
+	LIMITER_ENTRIES(&client_limiter,    "client_role_traffic",    "kb"),
+	LIMITER_ENTRIES(&server_limiter,    "server_role_traffic",    "kb"),
+	{}
+};
+
+static
+struct ctl_table io_tuning_table[] = {
+	LIMITER_ENTRIES(&global_writeback.limiter, "writeback",       "kb"),
+	INT_ENTRY("writeback_until_percent", global_writeback.until_percent, 0600),
+	THRESHOLD_ENTRIES(&global_io_threshold,  "global_io"),
+	THRESHOLD_ENTRIES(&bio_submit_threshold, "bio_submit"),
+	THRESHOLD_ENTRIES(&bio_io_threshold[0],  "bio_io_r"),
+	THRESHOLD_ENTRIES(&bio_io_threshold[1],  "bio_io_w"),
+	{}
+};
+
+static
+struct ctl_table tcp_tuning_table[] = {
+	INT_ENTRY("ip_tos",	     default_tcp_params.ip_tos,		 0600),
+	INT_ENTRY("tcp_window_size", default_tcp_params.tcp_window_size, 0600),
+	INT_ENTRY("tcp_nodelay",     default_tcp_params.tcp_nodelay,	 0600),
+	INT_ENTRY("tcp_timeout",     default_tcp_params.tcp_timeout,	 0600),
+	INT_ENTRY("tcp_keepcnt",     default_tcp_params.tcp_keepcnt,	 0600),
+	INT_ENTRY("tcp_keepintvl",   default_tcp_params.tcp_keepintvl,	 0600),
+	INT_ENTRY("tcp_keepidle",    default_tcp_params.tcp_keepidle,	 0600),
+	{}
+};
+
+static
+struct ctl_table mars_table[] = {
+	{
+		_CTL_NAME
+		.procname = "trigger",
+		.mode = 0200,
+		.proc_handler = &trigger_sysctl_handler,
+	},
+	{
+		_CTL_NAME
+		.procname = "info",
+		.mode = 0400,
+		.proc_handler = &trigger_sysctl_handler,
+	},
+	{
+		_CTL_NAME
+		.procname = "lamport_clock",
+		.mode = 0400,
+		.proc_handler = &lamport_sysctl_handler,
+	},
+	INT_ENTRY("show_log_messages",	  brick_say_logging,	  0600),
+	INT_ENTRY("show_debug_messages",  brick_say_debug,	  0600),
+	INT_ENTRY("show_statistics_global", global_show_statist,  0600),
+	INT_ENTRY("show_statistics_server", server_show_statist,  0600),
+	INT_ENTRY("logger_completion_semantics", trans_logger_completion_semantics, 0600),
+	INT_ENTRY("logger_do_crc",	  trans_logger_do_crc,	  0600),
+	INT_ENTRY("syslog_min_class",	  brick_say_syslog_min,   0600),
+	INT_ENTRY("syslog_max_class",	  brick_say_syslog_max,   0600),
+	INT_ENTRY("syslog_flood_class",   brick_say_syslog_flood_class, 0600),
+	INT_ENTRY("syslog_flood_limit",   brick_say_syslog_flood_limit, 0600),
+	INT_ENTRY("syslog_flood_recovery_s", brick_say_syslog_flood_recovery, 0600),
+	INT_ENTRY("delay_say_on_overflow", delay_say_on_overflow,  0600),
+	INT_ENTRY("mapfree_period_sec",   mapfree_period_sec,	  0600),
+	INT_ENTRY("mapfree_grace_keep_mb", mapfree_grace_keep_mb, 0600),
+	INT_ENTRY("logger_max_interleave", trans_logger_max_interleave, 0600),
+	INT_ENTRY("logger_resume",	  trans_logger_resume,	  0600),
+	INT_ENTRY("logger_replay_timeout_sec", trans_logger_replay_timeout, 0600),
+	INT_ENTRY("mem_limit_percent",	  mars_mem_percent,	  0600),
+	INT_ENTRY("logger_mem_used_kb",   trans_logger_mem_usage, 0400),
+	INT_ENTRY("mem_used_raw_kb",	  brick_global_block_used, 0400),
+#ifdef CONFIG_MARS_MEM_PREALLOC
+	INT_ENTRY("mem_allow_freelist",   brick_allow_freelist,   0600),
+	VEC_ENTRY("mem_freelist_max",	  brick_mem_freelist_max,  0600, BRICK_MAX_ORDER+1),
+	VEC_ENTRY("mem_alloc_count",	  brick_mem_alloc_count,  0400, BRICK_MAX_ORDER+1),
+	VEC_ENTRY("mem_alloc_max",	  brick_mem_alloc_count,  0600, BRICK_MAX_ORDER+1),
+#endif
+	INT_ENTRY("io_flying_count",	  xio_global_io_flying,  0400),
+	INT_ENTRY("copy_overlap",	  xio_copy_overlap,	  0600),
+	INT_ENTRY("copy_read_prio",	  xio_copy_read_prio,	  0600),
+	INT_ENTRY("copy_write_prio",	  xio_copy_write_prio,	 0600),
+	INT_ENTRY("copy_read_max_fly",	  xio_copy_read_max_fly, 0600),
+	INT_ENTRY("copy_write_max_fly",   xio_copy_write_max_fly, 0600),
+	INT_ENTRY("statusfiles_rollover_sec", mars_rollover_interval, 0600),
+	INT_ENTRY("scan_interval_sec",	  mars_scan_interval,	  0600),
+	INT_ENTRY("propagate_interval_sec", mars_propagate_interval, 0600),
+	INT_ENTRY("sync_flip_interval_sec", mars_sync_flip_interval, 0600),
+	INT_ENTRY("peer_abort",		  mars_peer_abort,	  0600),
+	INT_ENTRY("client_abort",	  xio_client_abort,	  0600),
+	INT_ENTRY("do_fast_fullsync",	  mars_fast_fullsync,	  0600),
+	INT_ENTRY("logrot_auto_gb",	  global_logrot_auto,	  0600),
+	INT_ENTRY("remaining_space_kb",   global_remaining_space, 0400),
+	INT_ENTRY("required_total_space_0_gb", global_free_space_0, 0600),
+	INT_ENTRY("required_free_space_1_gb", global_free_space_1, 0600),
+	INT_ENTRY("required_free_space_2_gb", global_free_space_2, 0600),
+	INT_ENTRY("required_free_space_3_gb", global_free_space_3, 0600),
+	INT_ENTRY("required_free_space_4_gb", global_free_space_4, 0600),
+	INT_ENTRY("sync_want",		  global_sync_want,	  0400),
+	INT_ENTRY("sync_nr",		  global_sync_nr,	  0400),
+	INT_ENTRY("sync_limit",		  global_sync_limit,	  0600),
+	INT_ENTRY("mars_emergency_mode",  mars_emergency_mode,	  0600),
+	INT_ENTRY("mars_reset_emergency", mars_reset_emergency,   0600),
+	INT_ENTRY("mars_keep_msg_s",	  mars_keep_msg,	  0600),
+	INT_ENTRY("write_throttle_start_percent", xio_throttle_start,	  0600),
+	INT_ENTRY("write_throttle_end_percent",   xio_throttle_end,	  0600),
+	INT_ENTRY("write_throttle_size_threshold_kb", if_throttle_start_size, 0400),
+	LIMITER_ENTRIES(&if_throttle,	  "write_throttle",	  "kb"),
+	/*  changing makes no sense because the server will immediately start upon modprobe */
+	INT_ENTRY("xio_port",		  xio_net_default_port,  0400),
+#ifdef __HAVE_LZO
+	INT_ENTRY("network_compress_data", xio_net_compress_data, 0600),
+#endif
+	INT_ENTRY("net_bind_before_listen", xio_net_bind_before_listen, 0600),
+	INT_ENTRY("net_bind_before_connect", xio_net_bind_before_connect, 0600),
+	INT_ENTRY("network_io_timeout",   global_net_io_timeout,  0600),
+	INT_ENTRY("parallel_connections", max_client_channels,	  0600),
+	INT_ENTRY("parallel_bulk_feed",   max_client_bulk,	  0600),
+	{
+		_CTL_NAME
+		.procname = "traffic_tuning",
+		.mode = 0500,
+		.child = traffic_tuning_table,
+	},
+	{
+		_CTL_NAME
+		.procname = "io_tuning",
+		.mode = 0500,
+		.child = io_tuning_table,
+	},
+	{
+		_CTL_NAME
+		.procname = "tcp_tuning",
+		.mode = 0500,
+		.child = tcp_tuning_table,
+	},
+	{}
+};
+
+static
+struct ctl_table mars_root_table[] = {
+	{
+		_CTL_NAME
+		.procname = "mars",
+		.mode = 0500,
+		.child = mars_table,
+	},
+	{}
+};
+
+/***************** module init stuff ************************/
+
+static struct ctl_table_header *header;
+
+int __init init_xio_proc(void)
+{
+
+	XIO_INF("init_proc()\n");
+
+	header = register_sysctl_table(mars_root_table);
+
+	return 0;
+}
+
+void exit_xio_proc(void)
+{
+	XIO_INF("exit_proc()\n");
+	if (header) {
+		unregister_sysctl_table(header);
+		header = NULL;
+	}
+}
diff --git a/include/linux/mars_light/mars_proc.h b/include/linux/mars_light/mars_proc.h
new file mode 100644
index 0000000..883b819
--- /dev/null
+++ b/include/linux/mars_light/mars_proc.h
@@ -0,0 +1,34 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef MARS_PROC_H
+#define MARS_PROC_H
+
+typedef char * (*xio_info_fn)(void);
+
+extern xio_info_fn xio_info;
+
+extern int min_free_kbytes;
+
+/***********************************************************************/
+
+/*  init */
+
+extern int init_xio_proc(void);
+extern void exit_xio_proc(void);
+
+#endif
-- 
2.6.4

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