mirror of https://github.com/schoebel/mars
269 lines
6.3 KiB
C
269 lines
6.3 KiB
C
// (c) 2011 Thomas Schoebel-Theuer / 1&1 Internet AG
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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/sysctl.h>
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#include <linux/uaccess.h>
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#include "strategy.h"
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#include "mars_proc.h"
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#include "../mars_bio.h"
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#include "../mars_aio.h"
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#include "../mars_client.h"
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#include "../mars_server.h"
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#include "../mars_trans_logger.h"
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mars_info_fn mars_info = NULL;
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static
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int trigger_sysctl_handler(
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ctl_table *table,
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int write,
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void __user *buffer,
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size_t *length,
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loff_t *ppos)
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{
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ssize_t res = 0;
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size_t len = *length;
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MARS_DBG("write = %d len = %ld pos = %lld\n", write, len, *ppos);
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if (!len || *ppos > 0) {
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goto done;
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}
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if (write) {
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char tmp[8] = {};
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int code = 0;
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res = len; // fake consumption of all data
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if (len > 7)
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len = 7;
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if (!copy_from_user(tmp, buffer, len)) {
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sscanf(tmp, "%d", &code);
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if (code) {
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mars_trigger();
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mars_remote_trigger();
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}
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}
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} else {
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char *answer = "MARS module not loaded\n";
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char *tmp = NULL;
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int mylen;
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if (mars_info) {
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answer = "internal error while determining mars_info\n";
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tmp = mars_info();
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if (tmp)
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answer = tmp;
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}
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mylen = strlen(answer);
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if (len > mylen)
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len = mylen;
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res = len;
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if (copy_to_user(buffer, answer, len)) {
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MARS_ERR("write %ld bytes at %p failed\n", len, buffer);
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res = -EFAULT;
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}
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brick_string_free(tmp);
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}
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done:
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MARS_DBG("res = %ld\n", res);
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*length = res;
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if (res >= 0) {
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*ppos += res;
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return 0;
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}
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return res;
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}
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static
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int lamport_sysctl_handler(
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ctl_table *table,
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int write,
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void __user *buffer,
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size_t *length,
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loff_t *ppos)
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{
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ssize_t res = 0;
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size_t len = *length;
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MARS_DBG("write = %d len = %ld pos = %lld\n", write, len, *ppos);
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if (!len || *ppos > 0) {
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goto done;
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}
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if (write) {
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return -EINVAL;
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} else {
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char *tmp = brick_string_alloc(len);
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struct timespec now = CURRENT_TIME;
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res = snprintf(tmp, len,
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"CURRENT_TIME=%ld.%09ld\n"
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"lamport_now=%ld.%09ld\n",
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now.tv_sec, now.tv_nsec,
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lamport_now.tv_sec, lamport_now.tv_nsec
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);
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if (copy_to_user(buffer, tmp, res)) {
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MARS_ERR("write %ld bytes at %p failed\n", res, buffer);
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res = -EFAULT;
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}
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brick_string_free(tmp);
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}
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done:
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MARS_DBG("res = %ld\n", res);
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*length = res;
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if (res >= 0) {
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*ppos += res;
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return 0;
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}
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return res;
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}
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#ifdef CONFIG_MARS_LOADAVG_LIMIT
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int mars_max_loadavg = 0;
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EXPORT_SYMBOL_GPL(mars_max_loadavg);
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#endif
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#ifdef CTL_UNNUMBERED
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#define _CTL_NAME .ctl_name = CTL_UNNUMBERED,
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#define _CTL_STRATEGY(handler) .strategy = &handler,
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#else
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#define _CTL_NAME /*empty*/
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#define _CTL_STRATEGY(handler) /*empty*/
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#endif
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#define INT_ENTRY(NAME,VAR,MODE) \
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{ \
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_CTL_NAME \
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.procname = NAME, \
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.data = &(VAR), \
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.maxlen = sizeof(int), \
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.mode = MODE, \
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.proc_handler = &proc_dointvec, \
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_CTL_STRATEGY(sysctl_intvec) \
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}
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#define LIMITER_ENTRIES(VAR, PREFIX, SUFFIX) \
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INT_ENTRY(PREFIX "_limit_" SUFFIX, (VAR)->lim_max_rate, 0600), \
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INT_ENTRY(PREFIX "_rate_" SUFFIX, (VAR)->lim_rate, 0400) \
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#define THRESHOLD_ENTRIES(VAR, PREFIX) \
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INT_ENTRY(PREFIX "_threshold_us", (VAR)->thr_limit, 0600), \
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INT_ENTRY(PREFIX "_factor_percent", (VAR)->thr_factor, 0600), \
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INT_ENTRY(PREFIX "_plus_us", (VAR)->thr_plus, 0600), \
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INT_ENTRY(PREFIX "_triggered", (VAR)->thr_triggered,0400), \
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INT_ENTRY(PREFIX "_true_hit", (VAR)->thr_true_hit, 0400) \
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static
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ctl_table tuning_table[] = {
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LIMITER_ENTRIES(&client_limiter, "traffic", "kb"),
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LIMITER_ENTRIES(&server_limiter, "server_io", "kb"),
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LIMITER_ENTRIES(&global_writeback.limiter, "writeback", "kb"),
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INT_ENTRY("writeback_until_percent", global_writeback.until_percent, 0600),
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THRESHOLD_ENTRIES(&bio_submit_threshold, "bio_submit"),
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THRESHOLD_ENTRIES(&bio_io_threshold[0], "bio_io_r"),
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THRESHOLD_ENTRIES(&bio_io_threshold[1], "bio_io_w"),
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THRESHOLD_ENTRIES(&aio_submit_threshold, "aio_submit"),
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THRESHOLD_ENTRIES(&aio_io_threshold[0], "aio_io_r"),
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THRESHOLD_ENTRIES(&aio_io_threshold[1], "aio_io_w"),
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THRESHOLD_ENTRIES(&aio_sync_threshold, "aio_sync"),
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{}
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};
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static
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ctl_table mars_table[] = {
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{
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_CTL_NAME
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.procname = "trigger",
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.mode = 0200,
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.proc_handler = &trigger_sysctl_handler,
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},
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{
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_CTL_NAME
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.procname = "lamport_clock",
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.mode = 0400,
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.proc_handler = &lamport_sysctl_handler,
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},
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INT_ENTRY("logger_do_crc", trans_logger_do_crc, 0600),
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INT_ENTRY("syslog_min_class", brick_say_syslog_min, 0600),
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INT_ENTRY("syslog_max_class", brick_say_syslog_max, 0600),
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INT_ENTRY("delay_say_on_overflow",delay_say_on_overflow, 0600),
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INT_ENTRY("mapfree_period_sec", mapfree_period_sec, 0600),
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INT_ENTRY("mem_limit_percent", mars_mem_percent, 0600),
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INT_ENTRY("logger_mem_used_kb", trans_logger_mem_usage, 0400),
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INT_ENTRY("mem_used_raw_kb", brick_global_block_used,0400),
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INT_ENTRY("io_flying_count", mars_global_io_flying, 0400),
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INT_ENTRY("statusfiles_rollover_sec", rollover_time, 0600),
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INT_ENTRY("logrot_auto_gb", global_logrot_auto, 0600),
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INT_ENTRY("logdel_auto_gb", global_logdel_auto, 0600),
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INT_ENTRY("free_space_mb", global_free_space, 0600),
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#ifdef CONFIG_MARS_LOADAVG_LIMIT
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INT_ENTRY("loadavg_limit", mars_max_loadavg, 0600),
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#endif
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INT_ENTRY("network_io_timeout", global_net_io_timeout, 0600),
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{
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_CTL_NAME
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.procname = "tuning",
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.mode = 0500,
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.child = tuning_table,
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},
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{}
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};
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static
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ctl_table mars_root_table[] = {
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{
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_CTL_NAME
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.procname = "mars",
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.mode = 0500,
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.child = mars_table,
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},
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{}
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};
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////////////////// module init stuff /////////////////////////
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static struct ctl_table_header *header = NULL;
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int __init init_mars_proc(void)
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{
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MARS_INF("init_proc()\n");
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header = register_sysctl_table(mars_root_table);
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return 0;
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}
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void __exit exit_mars_proc(void)
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{
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MARS_INF("exit_proc()\n");
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if (header) {
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unregister_sysctl_table(header);
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header = NULL;
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}
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}
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#ifndef CONFIG_MARS_HAVE_BIGMODULE
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MODULE_DESCRIPTION("MARS /proc/ infrastructure");
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MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
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MODULE_LICENSE("GPL");
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module_init(init_mars_proc);
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module_exit(exit_mars_proc);
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#endif
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