mirror of https://github.com/schoebel/mars
2029 lines
50 KiB
C
2029 lines
50 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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//#define STAT_DEBUGGING // here means: display full statistics
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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/debug_locks.h>
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#include <linux/major.h>
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#include <linux/genhd.h>
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#include <linux/blkdev.h>
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#define _STRATEGY
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#include "mars.h"
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#include <linux/kthread.h>
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#include <linux/wait.h>
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// used brick types
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#include "mars_server.h"
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#include "mars_client.h"
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#include "mars_copy.h"
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#include "mars_device_aio.h"
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#include "mars_trans_logger.h"
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#include "mars_if_device.h"
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static struct task_struct *main_thread = NULL;
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typedef int (*light_worker_fn)(void *buf, struct mars_dent *dent);
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struct light_class {
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char *cl_name;
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int cl_len;
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char cl_type;
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bool cl_hostcontext;
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bool cl_serial;
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int cl_father;
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light_worker_fn cl_forward;
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light_worker_fn cl_backward;
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};
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///////////////////////////////////////////////////////////////////////
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// internal helpers
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#define MARS_DELIM ','
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static int _parse_args(struct mars_dent *dent, char *str, int count)
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{
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int i;
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int status = -EINVAL;
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if (!str)
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goto done;
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if (!dent->d_args) {
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dent->d_args = kstrdup(str, GFP_MARS);
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if (!dent->d_args) {
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status = -ENOMEM;
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goto done;
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}
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}
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for (i = 0; i < count; i++) {
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char *tmp;
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int len;
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if (!*str)
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goto done;
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if (i == count-1) {
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len = strlen(str);
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} else {
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char *tmp = strchr(str, MARS_DELIM);
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if (!tmp)
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goto done;
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len = (tmp - str);
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}
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tmp = kzalloc(len+1, GFP_MARS);
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if (!tmp) {
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status = -ENOMEM;
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goto done;
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}
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if (dent->d_argv[i]) {
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kfree(dent->d_argv[i]);
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}
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dent->d_argv[i] = tmp;
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strncpy(dent->d_argv[i], str, len);
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dent->d_argv[i][len] = '\0';
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str += len;
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if (i != count-1)
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str++;
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}
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status = 0;
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done:
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if (status < 0) {
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MARS_ERR("bad syntax '%s' (should have %d args), status = %d\n", dent->d_args ? dent->d_args : "", count, status);
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}
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return status;
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}
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static
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char *_backskip_replace(const char *path, char delim, bool insert, const char *fmt, ...)
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{
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int path_len = strlen(path);
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int total_len = strlen(fmt) + path_len + MARS_PATH_MAX;
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char *res = kmalloc(total_len, GFP_MARS);
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if (likely(res)) {
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va_list args;
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int pos = path_len;
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int plus;
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while (pos > 0 && path[pos] != delim) {
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pos--;
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}
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memcpy(res, path, pos);
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va_start(args, fmt);
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plus = vsnprintf(res + pos, total_len - pos, fmt, args);
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va_end(args);
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if (insert) {
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strncpy(res + pos + plus, path + pos + 1, total_len - pos - plus);
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}
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}
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return res;
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}
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///////////////////////////////////////////////////////////////////////
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static
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int __make_copy(
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struct mars_global *global,
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struct mars_dent *belongs,
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const char *path,
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const char *parent,
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const char *argv[],
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loff_t start_pos, // -1 means at EOF
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struct copy_brick **__copy)
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{
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struct mars_brick *copy;
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struct copy_brick *_copy;
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const char *fullpath[2] = {};
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struct mars_output *output[2] = {};
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struct mars_info info[2] = {};
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int i;
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int status = -1;
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for (i = 0; i < 2; i++) {
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struct mars_brick *aio;
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if (parent) {
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fullpath[i] = path_make("%s/%s", parent, argv[i]);
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if (!fullpath[i]) {
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MARS_ERR("cannot make path '%s/%s'\n", parent, argv[i]);
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goto done;
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}
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} else {
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fullpath[i] = argv[i];
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}
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aio =
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make_brick_all(global,
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NULL,
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10 * HZ,
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NULL,
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(const struct generic_brick_type*)&device_aio_brick_type,
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(const struct generic_brick_type*[]){},
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fullpath[i],
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(const char *[]){},
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0);
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if (!aio) {
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MARS_DBG("cannot instantiate '%s'\n", fullpath[i]);
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goto done;
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}
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output[i] = aio->outputs[0];
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}
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copy =
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make_brick_all(global,
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belongs,
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0,
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path,
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(const struct generic_brick_type*)©_brick_type,
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(const struct generic_brick_type*[]){NULL,NULL,NULL,NULL},
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"%s",
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(const char *[]){"%s", "%s", "%s", "%s"},
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4,
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path,
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fullpath[0],
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fullpath[0],
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fullpath[1],
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fullpath[1]);
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if (!copy) {
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MARS_DBG("fail '%s'\n", path);
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goto done;
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}
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copy->status_level = 2;
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_copy = (void*)copy;
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if (__copy)
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*__copy = _copy;
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/* Determine the copy area, switch on when necessary
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*/
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if (!copy->power.button && copy->power.led_off) {
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for (i = 0; i < 2; i++) {
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status = output[i]->ops->mars_get_info(output[i], &info[i]);
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if (status < 0) {
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MARS_ERR("cannot determine current size of '%s'\n", argv[i]);
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goto done;
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}
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MARS_DBG("%d '%s' current_size = %lld\n", i, fullpath[i], info[i].current_size);
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}
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_copy->copy_start = info[1].current_size;
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if (start_pos != -1) {
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_copy->copy_start = start_pos;
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if (unlikely(info[0].current_size != info[1].current_size)) {
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MARS_ERR("oops, devices have different size %lld != %lld at '%s'\n", info[0].current_size, info[1].current_size, path);
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status = -EINVAL;
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goto done;
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}
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if (unlikely(start_pos > info[0].current_size)) {
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MARS_ERR("bad start position %lld is larger than actual size %lld on '%s'\n", start_pos, info[0].current_size, path);
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status = -EINVAL;
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goto done;
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}
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}
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MARS_DBG("copy_start = %lld\n", _copy->copy_start);
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_copy->copy_end = info[0].current_size;
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MARS_DBG("copy_end = %lld\n", _copy->copy_end);
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if (_copy->copy_start < _copy->copy_end) {
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status = mars_power_button_recursive((void*)copy, true, 10 * HZ);
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MARS_DBG("copy switch status = %d\n", status);
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}
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}
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status = 0;
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done:
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MARS_DBG("status = %d\n", status);
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for (i = 0; i < 2; i++) {
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if (fullpath[i] && fullpath[i] != argv[i])
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kfree(fullpath[i]);
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}
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return status;
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}
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///////////////////////////////////////////////////////////////////////
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// remote workers
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struct mars_peerinfo {
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struct mars_global *global;
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char *peer;
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char *path;
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struct socket *socket;
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struct task_struct *thread;
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wait_queue_head_t event;
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light_worker_fn worker;
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int maxdepth;
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};
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static
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int _update_file(struct mars_global *global, const char *path, const char *peer, loff_t end_pos)
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{
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const char *tmp = path_make("%s@%s", path, peer);
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const char *argv[2] = { tmp, path };
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struct copy_brick *copy = NULL;
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int status = -ENOMEM;
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if (unlikely(!tmp))
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goto done;
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MARS_DBG("tmp = '%s' path = '%s'\n", tmp, path);
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status = __make_copy(global, NULL, path, NULL, argv, -1, ©);
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if (status >= 0 && copy && !copy->permanent_update) {
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if (end_pos > copy->copy_end) {
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MARS_DBG("appending to '%s' %lld => %lld\n", path, copy->copy_end, end_pos);
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copy->copy_end = end_pos;
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}
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}
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done:
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if (tmp)
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kfree(tmp);
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return status;
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}
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static
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int _is_peer_logfile(const char *name, const char *id)
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{
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int len = strlen(name);
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int idlen = id ? strlen(id) : 4 + 9 + 1;
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if (len <= idlen ||
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strncmp(name, "log-", 4) != 0) {
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MARS_DBG("not a logfile at all: '%s'\n", name);
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return false;
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}
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if (id &&
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name[len - idlen - 1] == '-' &&
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strncmp(name + len - idlen, id, idlen) == 0) {
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MARS_DBG("not a peer logfile: '%s'\n", name);
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return false;
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}
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MARS_DBG("found peer logfile: '%s'\n", name);
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return true;
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}
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static
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int run_bones(void *buf, struct mars_dent *dent)
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{
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int status = 0;
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struct mars_peerinfo *peer = buf;
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struct kstat local_stat = {};
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bool stat_ok;
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bool update_mtime = true;
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bool update_ctime = true;
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if (!strncmp(dent->d_name, ".tmp", 4)) {
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goto done;
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}
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if (!strncmp(dent->d_name, "ignore", 6)) {
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goto done;
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}
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status = mars_lstat(dent->d_path, &local_stat);
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stat_ok = (status >= 0);
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if (stat_ok) {
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update_mtime = timespec_compare(&dent->new_stat.mtime, &local_stat.mtime) > 0;
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update_ctime = timespec_compare(&dent->new_stat.ctime, &local_stat.ctime) > 0;
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//MARS_DBG("timestamps '%s' remote = %ld.%09ld local = %ld.%09ld\n", dent->d_path, dent->new_stat.mtime.tv_sec, dent->new_stat.mtime.tv_nsec, local_stat.mtime.tv_sec, local_stat.mtime.tv_nsec);
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if ((dent->new_stat.mode & S_IRWXU) !=
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(local_stat.mode & S_IRWXU) &&
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update_ctime) {
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mode_t newmode = local_stat.mode;
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MARS_DBG("chmod '%s' 0x%xd -> 0x%xd\n", dent->d_path, newmode & S_IRWXU, dent->new_stat.mode & S_IRWXU);
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newmode &= ~S_IRWXU;
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newmode |= (dent->new_stat.mode & S_IRWXU);
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mars_chmod(dent->d_path, newmode);
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mars_trigger();
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}
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if (dent->new_stat.uid != local_stat.uid && update_ctime) {
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MARS_DBG("lchown '%s' %d -> %d\n", dent->d_path, local_stat.uid, dent->new_stat.uid);
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mars_lchown(dent->d_path, dent->new_stat.uid);
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mars_trigger();
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}
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}
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if (S_ISDIR(dent->new_stat.mode)) {
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if (strncmp(dent->d_name, "resource-", 9)) {
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MARS_DBG("ignoring directory '%s'\n", dent->d_path);
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goto done;
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}
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if (!stat_ok) {
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status = mars_mkdir(dent->d_path);
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MARS_DBG("create directory '%s' status = %d\n", dent->d_path, status);
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mars_chmod(dent->d_path, dent->new_stat.mode);
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mars_lchown(dent->d_path, dent->new_stat.uid);
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}
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} else if (S_ISLNK(dent->new_stat.mode) && dent->new_link) {
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if (!stat_ok || update_mtime) {
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status = mars_symlink(dent->new_link, dent->d_path, &dent->new_stat.mtime, dent->new_stat.uid);
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MARS_DBG("create symlink '%s' -> '%s' status = %d\n", dent->d_path, dent->new_link, status);
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mars_trigger();
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}
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} else if (S_ISREG(dent->new_stat.mode) && _is_peer_logfile(dent->d_name, my_id())) {
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loff_t src_size = dent->new_stat.size;
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if (!stat_ok || local_stat.size < src_size) {
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// check whether connect is allowed
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char *connect_path = _backskip_replace(dent->d_path, '/', false, "/connect-%s", my_id());
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if (likely(connect_path)) {
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struct kstat connect_stat = {};
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status = mars_lstat(connect_path, &connect_stat);
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MARS_DBG("connect_path = '%s' stat status = %d uid = %d\n", connect_path, status, connect_stat.uid);
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kfree(connect_path);
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if (status >= 0 && !connect_stat.uid) {
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// parent is not available here
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status = _update_file(peer->global, dent->d_path, peer->peer, src_size);
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MARS_DBG("update '%s' from peer '%s' status = %d\n", dent->d_path, peer->peer, status);
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if (status >= 0) {
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char *tmp = _backskip_replace(dent->d_path, '-', false, "-%s", my_id());
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status = -ENOMEM;
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if (likely(tmp)) {
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struct mars_dent *local_alias;
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status = 0;
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MARS_DBG("local alias for '%s' is '%s'\n", dent->d_path, tmp);
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local_alias = mars_find_dent((void*)peer->global, tmp);
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if (!local_alias) {
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status = mars_symlink(dent->d_name, tmp, &dent->new_stat.mtime, 0);
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MARS_DBG("create alias '%s' -> '%s' status = %d\n", tmp, dent->d_name, status);
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mars_trigger();
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}
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kfree(tmp);
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}
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}
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}
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}
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}
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} else {
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MARS_DBG("ignoring '%s'\n", dent->d_path);
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}
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done:
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return status;
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}
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///////////////////////////////////////////////////////////////////////
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// remote working infrastructure
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static
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void _peer_cleanup(struct mars_peerinfo *peer)
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{
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if (peer->socket) {
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kernel_sock_shutdown(peer->socket, SHUT_WR);
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peer->socket = NULL;
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}
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//...
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}
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static
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int remote_thread(void *data)
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{
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struct mars_peerinfo *peer = data;
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char *real_peer;
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struct sockaddr_storage sockaddr = {};
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int status;
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if (!peer)
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return -1;
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real_peer = mars_translate_hostname(peer->global, peer->peer);
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MARS_INF("-------- remote thread starting on peer '%s' (%s)\n", peer->peer, real_peer);
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//fake_mm();
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status = mars_create_sockaddr(&sockaddr, real_peer);
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if (unlikely(status < 0)) {
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MARS_ERR("unusable remote address '%s' (%s)\n", real_peer, peer->peer);
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goto done;
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}
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while (!kthread_should_stop()) {
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LIST_HEAD(tmp_list);
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struct mars_cmd cmd = {
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.cmd_code = CMD_GETENTS,
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.cmd_str1 = peer->path,
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.cmd_int1 = peer->maxdepth,
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};
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if (!peer->socket) {
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status = mars_create_socket(&peer->socket, &sockaddr, false);
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if (unlikely(status < 0)) {
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peer->socket = NULL;
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MARS_INF("no connection to '%s'\n", real_peer);
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msleep(5000);
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continue;
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}
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MARS_DBG("successfully opened socket to '%s'\n", real_peer);
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continue;
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}
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status = mars_send_struct(&peer->socket, &cmd, mars_cmd_meta);
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if (unlikely(status < 0)) {
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MARS_ERR("communication error on send, status = %d\n", status);
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_peer_cleanup(peer);
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msleep(5000);
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continue;
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}
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status = mars_recv_dent_list(&peer->socket, &tmp_list);
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if (unlikely(status < 0)) {
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MARS_ERR("communication error on receive, status = %d\n", status);
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_peer_cleanup(peer);
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msleep(5000);
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continue;
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}
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//MARS_DBG("AHA!!!!!!!!!!!!!!!!!!!!\n");
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{
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struct list_head *tmp;
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for (tmp = tmp_list.next; tmp != &tmp_list; tmp = tmp->next) {
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struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
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if (!dent->d_path) {
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MARS_DBG("NULL\n");
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continue;
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}
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//MARS_DBG("path = '%s'\n", dent->d_path);
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if (!peer->worker)
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continue;
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status = peer->worker(peer, dent);
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//MARS_DBG("path = '%s' worker status = %d\n", dent->d_path, status);
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}
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}
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mars_free_dent_all(&tmp_list);
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if (!kthread_should_stop())
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msleep(10 * 1000);
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}
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|
|
MARS_INF("-------- remote thread terminating\n");
|
|
|
|
_peer_cleanup(peer);
|
|
|
|
done:
|
|
//cleanup_mm();
|
|
peer->thread = NULL;
|
|
if (real_peer)
|
|
kfree(real_peer);
|
|
return 0;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
// helpers for worker functions
|
|
|
|
static int _kill_peer(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_peerinfo *peer = dent->d_private;
|
|
|
|
if (global->global_power.button) {
|
|
return 0;
|
|
}
|
|
if (!peer) {
|
|
return 0;
|
|
}
|
|
if (!peer->thread) {
|
|
MARS_ERR("oops, remote thread is not running - doing cleanup myself\n");
|
|
_peer_cleanup(peer);
|
|
dent->d_private = NULL;
|
|
return -1;
|
|
|
|
}
|
|
kthread_stop(peer->thread);
|
|
dent->d_private = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int _make_peer(void *buf, struct mars_dent *dent, char *mypeer, char *path, light_worker_fn worker)
|
|
{
|
|
static int serial = 0;
|
|
struct mars_global *global = buf;
|
|
struct mars_peerinfo *peer;
|
|
int status = 0;
|
|
|
|
if (!global->global_power.button || !dent->d_parent || !dent->new_link) {
|
|
return 0;
|
|
}
|
|
if (!mypeer) {
|
|
status = _parse_args(dent, dent->new_link, 1);
|
|
if (status < 0)
|
|
goto done;
|
|
mypeer = dent->d_argv[0];
|
|
}
|
|
|
|
MARS_DBG("peer '%s'\n", mypeer);
|
|
if (!dent->d_private) {
|
|
dent->d_private = kzalloc(sizeof(struct mars_peerinfo), GFP_MARS);
|
|
if (!dent->d_private) {
|
|
MARS_ERR("no memory for peer structure\n");
|
|
return -1;
|
|
}
|
|
|
|
peer = dent->d_private;
|
|
peer->global = global;
|
|
peer->peer = mypeer;
|
|
peer->path = path;
|
|
peer->worker = worker;
|
|
peer->maxdepth = 2;
|
|
init_waitqueue_head(&peer->event);
|
|
}
|
|
peer = dent->d_private;
|
|
if (!peer->thread) {
|
|
peer->thread = kthread_create(remote_thread, peer, "mars_remote%d", serial++);
|
|
if (unlikely(IS_ERR(peer->thread))) {
|
|
MARS_ERR("cannot start peer thread, status = %d\n", (int)PTR_ERR(peer->thread));
|
|
peer->thread = NULL;
|
|
return -1;
|
|
}
|
|
MARS_DBG("starting peer thread\n");
|
|
wake_up_process(peer->thread);
|
|
}
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static int _kill_remote(void *buf, struct mars_dent *dent)
|
|
{
|
|
return _kill_peer(buf, dent);
|
|
}
|
|
|
|
static int _make_remote(void *buf, struct mars_dent *dent)
|
|
{
|
|
return _make_peer(buf, dent, NULL, "/mars", NULL);
|
|
}
|
|
|
|
static int kill_scan(void *buf, struct mars_dent *dent)
|
|
{
|
|
return _kill_peer(buf, dent);
|
|
}
|
|
|
|
static int make_scan(void *buf, struct mars_dent *dent)
|
|
{
|
|
MARS_DBG("path = '%s' peer = '%s'\n", dent->d_path, dent->d_rest);
|
|
if (!strcmp(dent->d_rest, my_id())) {
|
|
return 0;
|
|
}
|
|
return _make_peer(buf, dent, dent->d_rest, "/mars", run_bones);
|
|
}
|
|
|
|
|
|
static
|
|
int kill_all(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
|
|
if (global->global_power.button &&
|
|
(!dent->d_kill_inactive || dent->d_activate)) {
|
|
return 0;
|
|
}
|
|
MARS_DBG("killing dent = '%s'\n", dent->d_path);
|
|
//mars_kill_dent(dent);
|
|
return 0;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
// handlers / helpers for logfile rotation
|
|
|
|
struct mars_rotate {
|
|
struct mars_global *global;
|
|
struct mars_dent *replay_link;
|
|
struct mars_dent *aio_dent;
|
|
struct device_aio_brick *aio_brick;
|
|
struct mars_info aio_info;
|
|
struct trans_logger_brick *trans_brick;
|
|
struct mars_dent *relevant_log;
|
|
struct mars_brick *relevant_brick;
|
|
struct mars_dent *current_log;
|
|
struct mars_dent *prev_log;
|
|
struct mars_dent *next_log;
|
|
long long last_jiffies;
|
|
loff_t start_pos;
|
|
loff_t end_pos;
|
|
int max_sequence;
|
|
bool has_error;
|
|
bool do_replay;
|
|
bool is_primary;
|
|
bool create_once;
|
|
};
|
|
|
|
static
|
|
void _create_new_logfile(char *path)
|
|
{
|
|
struct file *f;
|
|
const int flags = O_RDWR | O_CREAT | O_EXCL;
|
|
const int prot = 0600;
|
|
mm_segment_t oldfs;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
f = filp_open(path, flags, prot);
|
|
set_fs(oldfs);
|
|
if (IS_ERR(f)) {
|
|
MARS_ERR("could not create logfile '%s' status = %d\n", path, (int)PTR_ERR(f));
|
|
} else {
|
|
MARS_DBG("created empty logfile '%s'\n", path);
|
|
filp_close(f, NULL);
|
|
mars_trigger();
|
|
}
|
|
}
|
|
|
|
static
|
|
int _update_replaylink(struct mars_rotate *rot, struct mars_dent *parent, int sequence, loff_t pos, bool check_exist)
|
|
{
|
|
struct timespec now = {};
|
|
char *old;
|
|
char *new;
|
|
int status = -ENOMEM;
|
|
|
|
if (check_exist) {
|
|
struct kstat kstat;
|
|
char *test = path_make("%s/log-%09d-%s", parent->d_path, sequence, my_id());
|
|
if (!test) {
|
|
goto out_old;
|
|
}
|
|
status = mars_lstat(test, &kstat);
|
|
kfree(test);
|
|
if (status < 0) {
|
|
MARS_DBG("could not update replay link to nonexisting logfile %09d\n", sequence);
|
|
goto out_old;
|
|
}
|
|
status = -ENOMEM;
|
|
}
|
|
|
|
old = path_make("log-%09d-%s,%lld", sequence, my_id(), pos);
|
|
if (!old) {
|
|
goto out_old;
|
|
}
|
|
new = path_make("%s/replay-%s", parent->d_path, my_id());
|
|
if (!new) {
|
|
goto out_new;
|
|
}
|
|
|
|
get_lamport(&now);
|
|
status = mars_symlink(old, new, &now, 0);
|
|
if (status < 0) {
|
|
MARS_ERR("cannot create symlink '%s' -> '%s' status = %d\n", old, new, status);
|
|
} else {
|
|
MARS_DBG("make symlink '%s' -> '%s' status = %d\n", old, new, status);
|
|
}
|
|
if (status >= 0) {
|
|
rot->last_jiffies = jiffies;
|
|
}
|
|
|
|
kfree(new);
|
|
out_new:
|
|
kfree(old);
|
|
out_old:
|
|
return status;
|
|
}
|
|
|
|
/* This must be called once at every round of logfile checking.
|
|
*/
|
|
static
|
|
int make_log_init(void *buf, struct mars_dent *parent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_brick *aio_brick;
|
|
struct mars_brick *trans_brick;
|
|
struct mars_rotate *rot = parent->d_private;
|
|
struct mars_dent *replay_link;
|
|
struct mars_dent *aio_dent;
|
|
struct mars_output *output;
|
|
char *replay_path = NULL;
|
|
char *aio_path = NULL;
|
|
int status;
|
|
|
|
if (!rot) {
|
|
rot = kzalloc(sizeof(struct mars_rotate), GFP_MARS);
|
|
parent->d_private = rot;
|
|
if (!rot) {
|
|
MARS_ERR("cannot allocate rot structure\n");
|
|
status = -ENOMEM;
|
|
goto done;
|
|
}
|
|
rot->global = global;
|
|
}
|
|
|
|
rot->replay_link = NULL;
|
|
rot->aio_dent = NULL;
|
|
rot->aio_brick = NULL;
|
|
rot->relevant_log = NULL;
|
|
rot->relevant_brick = NULL;
|
|
rot->prev_log = NULL;
|
|
rot->next_log = NULL;
|
|
rot->max_sequence = 0;
|
|
rot->has_error = false;
|
|
|
|
/* Fetch the replay status symlink.
|
|
* It must exist, and its value will control everything.
|
|
*/
|
|
replay_path = path_make("%s/replay-%s", parent->d_path, my_id());
|
|
if (unlikely(!replay_path)) {
|
|
MARS_ERR("cannot make path\n");
|
|
status = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
replay_link = (void*)mars_find_dent(global, replay_path);
|
|
if (unlikely(!replay_link || !replay_link->new_link)) {
|
|
MARS_ERR("replay status symlink '%s' does not exist (%p)\n", replay_path, replay_link);
|
|
status = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
status = _parse_args(replay_link, replay_link->new_link, 2);
|
|
if (unlikely(status < 0)) {
|
|
goto done;
|
|
}
|
|
rot->replay_link = replay_link;
|
|
|
|
/* Fetch the referenced AIO dentry.
|
|
*/
|
|
aio_path = path_make("%s/%s", parent->d_path, replay_link->d_argv[0]);
|
|
if (unlikely(!aio_path)) {
|
|
MARS_ERR("cannot make path\n");
|
|
status = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
aio_dent = (void*)mars_find_dent(global, aio_path);
|
|
if (unlikely(!aio_dent)) {
|
|
MARS_ERR("logfile '%s' does not exist\n", aio_path);
|
|
status = -ENOENT;
|
|
if (rot->is_primary) { // try to create an empty logfile
|
|
_create_new_logfile(aio_path);
|
|
}
|
|
goto done;
|
|
}
|
|
rot->aio_dent = aio_dent;
|
|
|
|
/* Fetch / make the AIO brick instance
|
|
*/
|
|
aio_brick =
|
|
make_brick_all(global,
|
|
aio_dent,
|
|
10 * HZ,
|
|
aio_path,
|
|
(const struct generic_brick_type*)&device_aio_brick_type,
|
|
(const struct generic_brick_type*[]){},
|
|
"%s/%s",
|
|
(const char *[]){},
|
|
0,
|
|
parent->d_path,
|
|
replay_link->d_argv[0]);
|
|
if (!aio_brick) {
|
|
MARS_ERR("cannot access '%s'\n", aio_path);
|
|
status = -EIO;
|
|
goto done;
|
|
}
|
|
rot->aio_brick = (void*)aio_brick;
|
|
|
|
/* Fetch the actual logfile size
|
|
*/
|
|
output = aio_brick->outputs[0];
|
|
status = output->ops->mars_get_info(output, &rot->aio_info);
|
|
if (status < 0) {
|
|
MARS_ERR("cannot get info on '%s'\n", aio_path);
|
|
goto done;
|
|
}
|
|
MARS_DBG("logfile '%s' size = %lld\n", aio_path, rot->aio_info.current_size);
|
|
|
|
/* Fetch / make the transaction logger.
|
|
* We deliberately "forget" to connect the log input here.
|
|
* Will be carried out later in make_log().
|
|
* The final switch-on will be started in make_log_finalize().
|
|
*/
|
|
trans_brick =
|
|
make_brick_all(global,
|
|
parent,
|
|
0,
|
|
aio_path,
|
|
(const struct generic_brick_type*)&trans_logger_brick_type,
|
|
(const struct generic_brick_type*[]){(const struct generic_brick_type*)&device_aio_brick_type},
|
|
"%s/logger",
|
|
(const char *[]){"%s/data-%s"},
|
|
1,
|
|
parent->d_path,
|
|
parent->d_path,
|
|
my_id());
|
|
status = -ENOENT;
|
|
if (!trans_brick) {
|
|
goto done;
|
|
}
|
|
rot->trans_brick = (void*)trans_brick;
|
|
/* For safety, default is to try an (unnecessary) replay in case
|
|
* something goes wrong later.
|
|
*/
|
|
rot->do_replay = true;
|
|
|
|
status = 0;
|
|
|
|
done:
|
|
if (aio_path)
|
|
kfree(aio_path);
|
|
if (replay_path)
|
|
kfree(replay_path);
|
|
return status;
|
|
}
|
|
|
|
|
|
/* Internal helper. Return codes:
|
|
* ret < 0 : error
|
|
* ret == 0 : not relevant
|
|
* ret == 1 : relevant, no transaction replay
|
|
* ret == 2 : relevant for transaction replay
|
|
* ret == 3 : relevant for appending
|
|
*/
|
|
static
|
|
int _check_logging_status(struct mars_global *global, struct mars_dent *dent, long long *oldpos, long long *newpos)
|
|
{
|
|
struct mars_dent *parent = dent->d_parent;
|
|
struct mars_rotate *rot = parent->d_private;
|
|
int status = -EINVAL;
|
|
|
|
CHECK_PTR(rot, done);
|
|
|
|
status = 0;
|
|
if (!rot->replay_link || !rot->aio_dent || !rot->aio_brick) {
|
|
//MARS_DBG("nothing to do on '%s'\n", dent->d_path);
|
|
goto done;
|
|
}
|
|
|
|
if (rot->aio_dent->d_serial != dent->d_serial) {
|
|
//MARS_DBG("serial number %d not relevant\n", dent->d_serial);
|
|
goto done;
|
|
}
|
|
|
|
if (sscanf(rot->replay_link->d_argv[1], "%lld", oldpos) != 1) {
|
|
MARS_ERR("bad position argument '%s'\n", rot->replay_link->d_argv[1]);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(rot->aio_info.current_size < *oldpos)) {
|
|
MARS_ERR("oops, bad replay position attempted in logfile '%s' (file length %lld should never be smaller than requested position %lld, is your filesystem corrupted?) => please repair this by hand\n", rot->aio_dent->d_path, rot->aio_info.current_size, *oldpos);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (rot->aio_info.current_size > *oldpos) {
|
|
MARS_DBG("transaction log replay is necessary on '%s' from %lld to %lld\n", rot->aio_dent->d_path, *oldpos, rot->aio_info.current_size);
|
|
*newpos = rot->aio_info.current_size;
|
|
status = 2;
|
|
} else if (rot->aio_info.current_size > 0) {
|
|
MARS_DBG("transaction log '%s' is already applied (would be usable for appending at position %lld, but a fresh log is needed for safety reasons)\n", rot->aio_dent->d_path, *oldpos);
|
|
*newpos = rot->aio_info.current_size;
|
|
status = 1;
|
|
} else if (!rot->is_primary) {
|
|
MARS_DBG("empty transaction log '%s' would be usable, but I am not primary\n", rot->aio_dent->d_path);
|
|
status = 0;
|
|
} else {
|
|
MARS_DBG("empty transaction log '%s' is usable for me as a primary node\n", rot->aio_dent->d_path);
|
|
status = 3;
|
|
}
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
|
|
/* Note: this is strictly called in d_serial order.
|
|
* This is important!
|
|
*/
|
|
static
|
|
int make_log(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_dent *parent = dent->d_parent;
|
|
struct mars_rotate *rot = parent->d_private;
|
|
struct trans_logger_brick *trans_brick;
|
|
struct mars_dent *prev_log;
|
|
loff_t start_pos = 0;
|
|
loff_t end_pos = 0;
|
|
int status = -EINVAL;
|
|
|
|
CHECK_PTR(rot, err);
|
|
|
|
status = 0;
|
|
trans_brick = rot->trans_brick;
|
|
if (!global->global_power.button || !dent->d_parent || !trans_brick || rot->has_error) {
|
|
MARS_DBG("nothing to do rot_error = %d\n", rot->has_error);
|
|
goto done;
|
|
}
|
|
|
|
if (dent->d_serial > rot->max_sequence) {
|
|
rot->max_sequence = dent->d_serial;
|
|
}
|
|
|
|
/* Check for consecutiveness of logfiles
|
|
*/
|
|
prev_log = rot->next_log;
|
|
if (prev_log && prev_log->d_serial + 1 != dent->d_serial) {
|
|
MARS_ERR("transaction logs are not consecutive at '%s' (%d ~> %d)\n", dent->d_path, prev_log->d_serial, dent->d_serial);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Skip any logfiles after the relevant one.
|
|
* This should happen only when replaying multiple logfiles
|
|
* in sequence, or when starting a new logfile for writing.
|
|
*/
|
|
if (rot->relevant_log) {
|
|
if (rot->do_replay) {
|
|
status = 0;
|
|
goto ok;
|
|
}
|
|
if (rot->aio_dent->new_stat.size > 0) {
|
|
MARS_ERR("oops, the new logfile '%s' is not empty -- for safety, I will not use it -- log rotation is disabled now\n", dent->d_path);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
MARS_DBG("considering next logfile '%s' for rotation\n", dent->d_path);
|
|
}
|
|
|
|
/* Find current logging status.
|
|
*/
|
|
status = _check_logging_status(global, dent, &start_pos, &end_pos);
|
|
if (status < 0) {
|
|
goto done;
|
|
}
|
|
/* Relevant or not?
|
|
*/
|
|
switch (status) {
|
|
case 0: // not relevant
|
|
goto ok;
|
|
case 1: /* Relevant, but transaction replay already finished.
|
|
* When primary, switch over to a new logfile.
|
|
*/
|
|
if (!trans_brick->power.button && !trans_brick->power.led_on && trans_brick->power.led_off) {
|
|
_update_replaylink(rot, dent->d_parent, dent->d_serial + 1, 0, !rot->is_primary);
|
|
mars_trigger();
|
|
}
|
|
status = -EAGAIN;
|
|
goto done;
|
|
case 2: // relevant for transaction replay
|
|
MARS_DBG("replaying transaction log '%s' from %lld to %lld\n", dent->d_path, start_pos, end_pos);
|
|
rot->do_replay = true;
|
|
rot->start_pos = start_pos;
|
|
rot->end_pos = end_pos;
|
|
rot->relevant_log = dent;
|
|
break;
|
|
case 3: // relevant for appending
|
|
MARS_DBG("appending to transaction log '%s'\n", dent->d_path);
|
|
rot->do_replay = false;
|
|
rot->start_pos = 0;
|
|
rot->end_pos = 0;
|
|
rot->relevant_log = dent;
|
|
break;
|
|
default:
|
|
MARS_ERR("bad internal status %d\n", status);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
ok:
|
|
/* All ok: switch over the indicators.
|
|
*/
|
|
rot->prev_log = rot->next_log;
|
|
rot->next_log = dent;
|
|
|
|
done:
|
|
if (status < 0) {
|
|
MARS_DBG("rot_error status = %d\n", status);
|
|
rot->has_error = true;
|
|
}
|
|
err:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int _start_trans(struct mars_rotate *rot)
|
|
{
|
|
struct trans_logger_brick *trans_brick = rot->trans_brick;
|
|
int status = 0;
|
|
|
|
if (trans_brick->power.button) {
|
|
goto done;
|
|
}
|
|
|
|
/* Internal safety checks
|
|
*/
|
|
status = -EINVAL;
|
|
if (unlikely(!rot->aio_brick || !rot->relevant_log)) {
|
|
MARS_ERR("something is missing, this should not happen\n");
|
|
goto done;
|
|
}
|
|
if (unlikely(rot->relevant_brick)) {
|
|
MARS_ERR("log aio brick already present, this should not happen\n");
|
|
goto done;
|
|
}
|
|
|
|
/* For safety, disconnect old connection first
|
|
*/
|
|
if (trans_brick->inputs[1]->connect) {
|
|
(void)generic_disconnect((void*)trans_brick->inputs[1]);
|
|
}
|
|
|
|
/* Open new transaction log
|
|
*/
|
|
rot->relevant_brick =
|
|
make_brick_all(rot->global,
|
|
rot->relevant_log,
|
|
10 * HZ,
|
|
rot->relevant_log->d_path,
|
|
(const struct generic_brick_type*)&device_aio_brick_type,
|
|
(const struct generic_brick_type*[]){},
|
|
rot->relevant_log->d_path,
|
|
(const char *[]){},
|
|
0);
|
|
if (!rot->relevant_brick) {
|
|
MARS_ERR("log aio brick not open\n");
|
|
goto done;
|
|
}
|
|
|
|
/* Connect to new transaction log
|
|
*/
|
|
status = generic_connect((void*)trans_brick->inputs[1], (void*)rot->relevant_brick->outputs[0]);
|
|
if (status < 0) {
|
|
goto done;
|
|
}
|
|
|
|
/* Supply all relevant parameters
|
|
*/
|
|
trans_brick->sequence = rot->relevant_log->d_serial;
|
|
trans_brick->do_replay = rot->do_replay;
|
|
trans_brick->current_pos = rot->start_pos;
|
|
trans_brick->start_pos = rot->start_pos;
|
|
trans_brick->end_pos = rot->end_pos;
|
|
|
|
/* Switch on....
|
|
*/
|
|
status = mars_power_button((void*)trans_brick, true);
|
|
MARS_DBG("status = %d\n", status);
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int _stop_trans(struct mars_rotate *rot)
|
|
{
|
|
struct trans_logger_brick *trans_brick = rot->trans_brick;
|
|
int status = 0;
|
|
|
|
if (!trans_brick->power.button) {
|
|
goto done;
|
|
}
|
|
|
|
/* Switch off....
|
|
*/
|
|
status = mars_power_button((void*)trans_brick, false);
|
|
MARS_DBG("status = %d\n", status);
|
|
if (status < 0) {
|
|
goto done;
|
|
}
|
|
|
|
/* Disconnect old connection
|
|
*/
|
|
if (trans_brick->inputs[1]->connect && trans_brick->power.led_off) {
|
|
(void)generic_disconnect((void*)trans_brick->inputs[1]);
|
|
}
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int make_log_finalize(struct mars_global *global, struct mars_dent *parent)
|
|
{
|
|
struct mars_rotate *rot = parent->d_private;
|
|
struct trans_logger_brick *trans_brick;
|
|
int status = -EINVAL;
|
|
|
|
CHECK_PTR(rot, done);
|
|
|
|
trans_brick = rot->trans_brick;
|
|
|
|
status = 0;
|
|
if (!trans_brick) {
|
|
MARS_DBG("nothing to do\n");
|
|
goto done;
|
|
}
|
|
/* Stopping is also possible in case of errors
|
|
*/
|
|
if (trans_brick->power.button && trans_brick->power.led_on && !trans_brick->power.led_off) {
|
|
bool do_stop =
|
|
(rot->do_replay || trans_brick->do_replay)
|
|
? (trans_brick->current_pos == trans_brick->end_pos)
|
|
: (rot->relevant_log && rot->relevant_log != rot->current_log);
|
|
MARS_DBG("do_stop = %d\n", (int)do_stop);
|
|
|
|
if (do_stop || (long long)jiffies > rot->last_jiffies + 5 * HZ) {
|
|
status = _update_replaylink(rot, parent, trans_brick->sequence, trans_brick->current_pos, true);
|
|
}
|
|
if (do_stop) {
|
|
status = _stop_trans(rot);
|
|
}
|
|
goto done;
|
|
}
|
|
/* Special case: after a fresh start, when no logfile exists,
|
|
* create one. This is a thin exception from the rule that
|
|
* normally userspace should control what happens in MARS.
|
|
*/
|
|
if (!rot->relevant_log && rot->is_primary && !rot->has_error && rot->max_sequence > 0 && !rot->create_once) { // try to create an empty logfile
|
|
char *tmp = path_make("%s/log-%09d-%s", parent->d_path, rot->max_sequence + 1, my_id());
|
|
if (likely(tmp)) {
|
|
_create_new_logfile(tmp);
|
|
kfree(tmp);
|
|
rot->create_once = true;
|
|
msleep(1000);
|
|
goto done;
|
|
}
|
|
}
|
|
/* Starting is only possible when no error ocurred.
|
|
*/
|
|
if (!rot->relevant_log || rot->has_error) {
|
|
MARS_DBG("nothing to do\n");
|
|
goto done;
|
|
}
|
|
|
|
/* Start when necessary
|
|
*/
|
|
if (!trans_brick->power.button && !trans_brick->power.led_on && trans_brick->power.led_off) {
|
|
bool do_start = (!rot->do_replay || rot->start_pos != rot->end_pos);
|
|
MARS_DBG("do_start = %d\n", (int)do_start);
|
|
|
|
if (do_start) {
|
|
status = _start_trans(rot);
|
|
rot->current_log = rot->relevant_log;
|
|
}
|
|
} else {
|
|
MARS_DBG("trans_brick %d %d %d\n", trans_brick->power.button, trans_brick->power.led_on, trans_brick->power.led_off);
|
|
}
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
// specific handlers
|
|
|
|
static
|
|
int make_primary(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_dent *parent;
|
|
struct mars_rotate *rot;
|
|
int status = -EINVAL;
|
|
|
|
parent = dent->d_parent;
|
|
CHECK_PTR(parent, done);
|
|
rot = parent->d_private;
|
|
CHECK_PTR(rot, done);
|
|
|
|
rot->is_primary = (dent->new_link && !strcmp(dent->new_link, my_id()));
|
|
status = 0;
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int make_aio(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_brick *brick;
|
|
struct device_aio_brick *_brick;
|
|
int status = 0;
|
|
|
|
if (!global->global_power.button || !dent->d_activate) {
|
|
goto done;
|
|
}
|
|
if (mars_find_brick(global, &device_aio_brick_type, dent->d_path)) {
|
|
goto done;
|
|
}
|
|
dent->d_kill_inactive = true;
|
|
brick =
|
|
make_brick_all(global,
|
|
dent,
|
|
10 * HZ,
|
|
dent->d_path,
|
|
(const struct generic_brick_type*)&device_aio_brick_type,
|
|
(const struct generic_brick_type*[]){},
|
|
dent->d_path,
|
|
(const char *[]){},
|
|
0);
|
|
if (unlikely(!brick)) {
|
|
status = -ENXIO;
|
|
goto done;
|
|
}
|
|
brick->outputs[0]->output_name = dent->d_path;
|
|
_brick = (void*)brick;
|
|
_brick->outputs[0]->o_fdsync = true;
|
|
status = mars_power_button((void*)brick, true);
|
|
if (status < 0) {
|
|
kill_all(buf, dent);
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static int make_dev(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_dent *parent = dent->d_parent;
|
|
struct mars_rotate *rot = parent->d_private;
|
|
struct mars_brick *dev_brick;
|
|
int status = 0;
|
|
|
|
if (!global->global_power.button || !dent->d_parent || !dent->new_link) {
|
|
MARS_DBG("nothing to do\n");
|
|
goto done;
|
|
}
|
|
|
|
status = make_log_finalize(global, dent->d_parent);
|
|
if (status < 0) {
|
|
MARS_DBG("logger not initialized\n");
|
|
goto done;
|
|
}
|
|
if (!rot || !rot->is_primary) {
|
|
MARS_DBG("I am not primary, don't show the device\n");
|
|
goto done;
|
|
}
|
|
if (!rot->trans_brick || rot->trans_brick->do_replay || !rot->trans_brick->power.led_on || rot->trans_brick->power.led_off) {
|
|
MARS_DBG("transaction logger not ready for writing\n");
|
|
goto done;
|
|
}
|
|
|
|
status = _parse_args(dent, dent->new_link, 1);
|
|
if (status < 0) {
|
|
MARS_DBG("fail\n");
|
|
goto done;
|
|
}
|
|
|
|
dev_brick =
|
|
make_brick_all(global,
|
|
dent,
|
|
10 * HZ,
|
|
dent->d_argv[0],
|
|
(const struct generic_brick_type*)&if_device_brick_type,
|
|
(const struct generic_brick_type*[]){(const struct generic_brick_type*)&trans_logger_brick_type},
|
|
"%s/linuxdev-%s",
|
|
(const char *[]){"%s/logger"},
|
|
1,
|
|
dent->d_parent->d_path,
|
|
dent->d_argv[0],
|
|
dent->d_parent->d_path);
|
|
if (!dev_brick) {
|
|
MARS_DBG("fail\n");
|
|
return -1;
|
|
}
|
|
dev_brick->status_level = 1;
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static int _make_direct(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
struct mars_brick *brick;
|
|
int status;
|
|
|
|
if (!global->global_power.button || !dent->d_parent || !dent->new_link) {
|
|
return 0;
|
|
}
|
|
status = _parse_args(dent, dent->new_link, 2);
|
|
if (status < 0) {
|
|
goto done;
|
|
}
|
|
brick =
|
|
make_brick_all(global,
|
|
dent,
|
|
10 * HZ,
|
|
dent->d_argv[0],
|
|
(const struct generic_brick_type*)&device_aio_brick_type,
|
|
(const struct generic_brick_type*[]){},
|
|
"%s/%s",
|
|
(const char *[]){},
|
|
0,
|
|
dent->d_parent->d_path,
|
|
dent->d_argv[0]);
|
|
status = -1;
|
|
if (!brick) {
|
|
MARS_DBG("fail\n");
|
|
goto done;
|
|
}
|
|
|
|
brick =
|
|
make_brick_all(global,
|
|
dent,
|
|
10 * HZ,
|
|
dent->d_argv[1],
|
|
(const struct generic_brick_type*)&if_device_brick_type,
|
|
(const struct generic_brick_type*[]){NULL},
|
|
"%s/linuxdev-%s",
|
|
(const char *[]){ "%s/%s" },
|
|
1,
|
|
dent->d_parent->d_path,
|
|
dent->d_argv[1],
|
|
dent->d_parent->d_path,
|
|
dent->d_argv[0]),
|
|
status = -1;
|
|
if (!brick) {
|
|
MARS_DBG("fail\n");
|
|
goto done;
|
|
}
|
|
|
|
status = 0;
|
|
done:
|
|
MARS_DBG("status = %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int _make_copy(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
int status;
|
|
|
|
if (!global->global_power.button || !dent->d_parent || !dent->new_link) {
|
|
return 0;
|
|
}
|
|
status = _parse_args(dent, dent->new_link, 2);
|
|
if (status < 0) {
|
|
goto done;
|
|
}
|
|
|
|
status = __make_copy(global, dent, dent->d_path, dent->d_parent->d_path, (const char**)dent->d_argv, -1, NULL);
|
|
|
|
done:
|
|
MARS_DBG("status = %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int make_sync(void *buf, struct mars_dent *dent)
|
|
{
|
|
struct mars_global *global = buf;
|
|
loff_t start_pos = 0;
|
|
struct mars_dent *connect_dent;
|
|
char *peer;
|
|
struct copy_brick *copy = NULL;
|
|
char *tmp = NULL;
|
|
char *src = NULL;
|
|
char *dst = NULL;
|
|
int status;
|
|
|
|
if (!global->global_power.button || !dent->d_activate || !dent->d_parent || !dent->new_link) {
|
|
return 0;
|
|
}
|
|
|
|
/* Analyze replay position
|
|
*/
|
|
status = sscanf(dent->new_link, "%lld", &start_pos);
|
|
if (status != 1) {
|
|
MARS_ERR("bad syncstatus symlink syntax '%s' (%s)\n", dent->new_link, dent->d_path);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
dent->d_kill_inactive = true;
|
|
|
|
/* Determine peer
|
|
*/
|
|
tmp = path_make("%s/connect-%s", dent->d_parent->d_path, my_id());
|
|
status = -ENOMEM;
|
|
if (unlikely(!tmp))
|
|
goto done;
|
|
connect_dent = (void*)mars_find_dent(global, tmp);
|
|
if (!connect_dent || !connect_dent->new_link) {
|
|
MARS_ERR("cannot determine peer, symlink '%s' is missing\n", tmp);
|
|
status = -ENOENT;
|
|
goto done;
|
|
}
|
|
connect_dent->d_kill_inactive = true;
|
|
if (!connect_dent->d_activate) {
|
|
MARS_DBG("sync paused: symlink '%s' is deactivated\n", tmp);
|
|
status = 0;
|
|
goto done;
|
|
}
|
|
peer = connect_dent->new_link;
|
|
|
|
/* Start copy
|
|
*/
|
|
src = path_make("data-%s@%s", peer, peer);
|
|
dst = path_make("data-%s", my_id());
|
|
status = -ENOMEM;
|
|
if (unlikely(!src || !dst))
|
|
goto done;
|
|
|
|
MARS_DBG("starting initial sync '%s' => '%s'\n", src, dst);
|
|
|
|
{
|
|
const char *argv[2] = { src, dst };
|
|
status = __make_copy(global, dent, dent->d_path, dent->d_parent->d_path, argv, start_pos, ©);
|
|
}
|
|
|
|
/* Update syncstatus symlink
|
|
*/
|
|
if (status >= 0 && copy && copy->power.button && copy->power.led_on) {
|
|
kfree(src);
|
|
kfree(dst);
|
|
src = path_make("%lld", copy->copy_last);
|
|
dst = path_make("%s/syncstatus-%s", dent->d_parent->d_path, my_id());
|
|
status = -ENOMEM;
|
|
if (unlikely(!src || !dst))
|
|
goto done;
|
|
status = mars_symlink(src, dst, NULL, 0);
|
|
if (status >= 0 && copy->copy_last == copy->copy_end) {
|
|
status = mars_power_button((void*)copy, false);
|
|
MARS_DBG("copy switch status = %d\n", status);
|
|
}
|
|
}
|
|
|
|
done:
|
|
MARS_DBG("status = %d\n", status);
|
|
if (tmp)
|
|
kfree(tmp);
|
|
if (src)
|
|
kfree(src);
|
|
if (dst)
|
|
kfree(dst);
|
|
return status;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
// the order is important!
|
|
enum {
|
|
// root element: this must have index 0
|
|
CL_ROOT,
|
|
// replacement for DNS in kernelspace
|
|
CL_IPS,
|
|
CL_PEERS,
|
|
// resource definitions
|
|
CL_RESOURCE,
|
|
CL_CONNECT,
|
|
CL_DATA,
|
|
CL_PRIMARY,
|
|
CL__FILE,
|
|
CL_SYNC,
|
|
CL__COPY,
|
|
CL__REMOTE,
|
|
CL__DIRECT,
|
|
CL_REPLAYSTATUS,
|
|
CL_LOG,
|
|
CL_DEVICE,
|
|
};
|
|
|
|
/* Please keep the order the same as in the enum.
|
|
*/
|
|
static const struct light_class light_classes[] = {
|
|
/* Placeholder for root node /mars/
|
|
*/
|
|
[CL_ROOT] = {
|
|
},
|
|
|
|
/* Directory containing the addresses of all peers
|
|
*/
|
|
[CL_IPS] = {
|
|
.cl_name = "ips",
|
|
.cl_len = 3,
|
|
.cl_type = 'd',
|
|
.cl_father = CL_ROOT,
|
|
#if 0
|
|
.cl_forward = make_scan,
|
|
.cl_backward = kill_scan,
|
|
#endif
|
|
},
|
|
/* Anyone participating in a MARS cluster must
|
|
* be named here (symlink pointing to the IP address).
|
|
* We have no DNS in kernel space.
|
|
*/
|
|
[CL_PEERS] = {
|
|
.cl_name = "ip-",
|
|
.cl_len = 3,
|
|
.cl_type = 'l',
|
|
.cl_father = CL_IPS,
|
|
#if 1
|
|
.cl_forward = make_scan,
|
|
.cl_backward = kill_scan,
|
|
#endif
|
|
},
|
|
|
|
/* Directory containing all items of a resource
|
|
*/
|
|
[CL_RESOURCE] = {
|
|
.cl_name = "resource-",
|
|
.cl_len = 9,
|
|
.cl_type = 'd',
|
|
.cl_father = CL_ROOT,
|
|
.cl_forward = make_log_init,
|
|
.cl_backward = NULL,
|
|
},
|
|
/* Symlink indicating the current peer
|
|
*/
|
|
[CL_CONNECT] = {
|
|
.cl_name = "connect-",
|
|
.cl_len = 8,
|
|
.cl_type = 'l',
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = NULL,
|
|
.cl_backward = NULL,
|
|
},
|
|
/* File or symlink to the real device / real (sparse) file
|
|
* when hostcontext is missing, the corresponding peer will
|
|
* not participate in that resource.
|
|
*/
|
|
[CL_DATA] = {
|
|
.cl_name = "data-",
|
|
.cl_len = 5,
|
|
.cl_type = 'F',
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = make_aio,
|
|
.cl_backward = kill_all,
|
|
},
|
|
/* Symlink pointing to the name of the primary node
|
|
*/
|
|
[CL_PRIMARY] = {
|
|
.cl_name = "primary",
|
|
.cl_len = 7,
|
|
.cl_type = 'l',
|
|
.cl_hostcontext = false,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = make_primary,
|
|
.cl_backward = NULL,
|
|
},
|
|
/* Only for testing: open local file
|
|
*/
|
|
[CL__FILE] = {
|
|
.cl_name = "_file-",
|
|
.cl_len = 6,
|
|
.cl_type = 'F',
|
|
.cl_serial = true,
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = make_aio,
|
|
.cl_backward = kill_all,
|
|
},
|
|
/* symlink indicating the current status / end
|
|
* of initial data sync.
|
|
*/
|
|
[CL_SYNC] = {
|
|
.cl_name = "syncstatus-",
|
|
.cl_len = 11,
|
|
.cl_type = 'l',
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = make_sync,
|
|
.cl_backward = kill_all,
|
|
},
|
|
/* Only for testing: make a copy instance
|
|
*/
|
|
[CL__COPY] = {
|
|
.cl_name = "_copy-",
|
|
.cl_len = 6,
|
|
.cl_type = 'l',
|
|
.cl_serial = true,
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = _make_copy,
|
|
.cl_backward = kill_all,
|
|
},
|
|
/* Only for testing: access remote data directly
|
|
*/
|
|
[CL__REMOTE] = {
|
|
.cl_name = "_remote-",
|
|
.cl_len = 8,
|
|
.cl_type = 'l',
|
|
.cl_serial = true,
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = _make_remote,
|
|
.cl_backward = _kill_remote,
|
|
},
|
|
/* Only for testing: access local data
|
|
*/
|
|
[CL__DIRECT] = {
|
|
.cl_name = "_direct-",
|
|
.cl_len = 8,
|
|
.cl_type = 'l',
|
|
.cl_serial = true,
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = _make_direct,
|
|
.cl_backward = kill_all,
|
|
},
|
|
|
|
/* Passive symlink indicating the last state of
|
|
* transaction log replay.
|
|
*/
|
|
[CL_REPLAYSTATUS] = {
|
|
.cl_name = "replay-",
|
|
.cl_len = 7,
|
|
.cl_type = 'l',
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
#if 0
|
|
.cl_forward = make_replay,
|
|
.cl_backward = kill_all,
|
|
#endif
|
|
},
|
|
/* Logfiles for transaction logger
|
|
*/
|
|
[CL_LOG] = {
|
|
.cl_name = "log-",
|
|
.cl_len = 4,
|
|
.cl_type = 'F',
|
|
.cl_serial = true,
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
#if 1
|
|
.cl_forward = make_log,
|
|
.cl_backward = kill_all,
|
|
#endif
|
|
},
|
|
|
|
/* Name of the device appearing at the primary
|
|
*/
|
|
[CL_DEVICE] = {
|
|
.cl_name = "device-",
|
|
.cl_len = 7,
|
|
.cl_type = 'l',
|
|
.cl_hostcontext = true,
|
|
.cl_father = CL_RESOURCE,
|
|
.cl_forward = make_dev,
|
|
.cl_backward = kill_all,
|
|
},
|
|
{}
|
|
};
|
|
|
|
/* Helper routine to pre-determine the relevance of a name from the filesystem.
|
|
*/
|
|
static int light_checker(const char *path, const char *_name, int namlen, unsigned int d_type, int *prefix, int *serial)
|
|
{
|
|
int class;
|
|
int status = -2;
|
|
#ifdef MARS_DEBUGGING
|
|
const char *name = kstrdup(_name, GFP_MARS);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
#else
|
|
const char *name = _name;
|
|
#endif
|
|
|
|
//MARS_DBG("trying '%s' '%s'\n", path, name);
|
|
for (class = CL_ROOT + 1; ; class++) {
|
|
const struct light_class *test = &light_classes[class];
|
|
int len = test->cl_len;
|
|
if (!len || !test->cl_name)
|
|
break;
|
|
//MARS_DBG(" testing class '%s'\n", test->cl_name);
|
|
#if 0
|
|
if (len != strlen(test->cl_name)) {
|
|
MARS_ERR("internal table '%s': %d != %d\n", test->cl_name, len, (int)strlen(test->cl_name));
|
|
len = strlen(test->cl_name);
|
|
}
|
|
#endif
|
|
if (namlen >= len && !memcmp(name, test->cl_name, len)) {
|
|
//MARS_DBG("path '%s/%s' matches class %d '%s'\n", path, name, class, test->cl_name);
|
|
// special contexts
|
|
if (test->cl_serial) {
|
|
int plus = 0;
|
|
int count;
|
|
count = sscanf(name+len, "%d%n", serial, &plus);
|
|
if (count < 1) {
|
|
//MARS_DBG("'%s' serial number mismatch at '%s'\n", name, name+len);
|
|
status = -1;
|
|
goto done;
|
|
}
|
|
len += plus;
|
|
if (name[len] == '-')
|
|
len++;
|
|
}
|
|
*prefix = len;
|
|
if (test->cl_hostcontext) {
|
|
if (memcmp(name+len, my_id(), namlen-len)) {
|
|
//MARS_DBG("context mismatch '%s' at '%s'\n", name, name+len);
|
|
status = -1;
|
|
goto done;
|
|
}
|
|
}
|
|
status = class;
|
|
goto done;
|
|
}
|
|
}
|
|
//MARS_DBG("no match for '%s' '%s'\n", path, name);
|
|
done:
|
|
#ifdef MARS_DEBUGGING
|
|
if (name)
|
|
kfree(name);
|
|
#endif
|
|
return status;
|
|
}
|
|
|
|
/* Do some syntactic checks, then delegate work to the real worker functions
|
|
* from the light_classes[] table.
|
|
*/
|
|
static int light_worker(struct mars_global *global, struct mars_dent *dent, bool direction)
|
|
{
|
|
light_worker_fn worker;
|
|
int class = dent->d_class;
|
|
|
|
if (class < 0 || class >= sizeof(light_classes)/sizeof(struct light_class)) {
|
|
MARS_ERR_ONCE(dent, "bad internal class %d of '%s'\n", class, dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
switch (light_classes[class].cl_type) {
|
|
case 'd':
|
|
if (!S_ISDIR(dent->new_stat.mode)) {
|
|
MARS_ERR_ONCE(dent, "'%s' should be a directory, but is something else\n", dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case 'f':
|
|
if (!S_ISREG(dent->new_stat.mode)) {
|
|
MARS_ERR_ONCE(dent, "'%s' should be a regular file, but is something else\n", dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case 'F':
|
|
if (!S_ISREG(dent->new_stat.mode) && !S_ISLNK(dent->new_stat.mode)) {
|
|
MARS_ERR_ONCE(dent, "'%s' should be a regular file or a symlink, but is something else\n", dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case 'l':
|
|
if (!S_ISLNK(dent->new_stat.mode)) {
|
|
MARS_ERR_ONCE(dent, "'%s' should be a symlink, but is something else\n", dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
}
|
|
if (likely(class > CL_ROOT)) {
|
|
int father = light_classes[class].cl_father;
|
|
if (father == CL_ROOT) {
|
|
if (unlikely(dent->d_parent)) {
|
|
MARS_ERR_ONCE(dent, "'%s' is not at the root of the hierarchy\n", dent->d_path);
|
|
return -EINVAL;
|
|
}
|
|
} else if (unlikely(!dent->d_parent || dent->d_parent->d_class != father)) {
|
|
MARS_ERR_ONCE(dent, "last component '%s' from '%s' is at the wrong position in the hierarchy (class = %d, parent_class = %d, parent = '%s')\n", dent->d_name, dent->d_path, father, dent->d_parent ? dent->d_parent->d_class : -9999, dent->d_parent ? dent->d_parent->d_path : "");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (direction) {
|
|
worker = light_classes[class].cl_backward;
|
|
} else {
|
|
worker = light_classes[class].cl_forward;
|
|
}
|
|
if (worker) {
|
|
int status;
|
|
//MARS_DBG("working %s on '%s' rest='%s'\n", direction ? "backward" : "forward", dent->d_path, dent->d_rest);
|
|
status = worker(global, (void*)dent);
|
|
MARS_DBG("worked %s on '%s', status = %d\n", direction ? "backward" : "forward", dent->d_path, status);
|
|
return status;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void _show_status(struct mars_global *global)
|
|
{
|
|
struct list_head *tmp;
|
|
|
|
down(&global->mutex);
|
|
for (tmp = global->brick_anchor.next; tmp != &global->brick_anchor; tmp = tmp->next) {
|
|
struct mars_brick *test;
|
|
const char *path;
|
|
char *src;
|
|
char *dst;
|
|
int status;
|
|
|
|
test = container_of(tmp, struct mars_brick, global_brick_link);
|
|
if (test->status_level <= 0)
|
|
continue;
|
|
|
|
path = test->brick_path;
|
|
if (!path) {
|
|
MARS_DBG("bad path\n");
|
|
continue;
|
|
}
|
|
if (*path != '/') {
|
|
MARS_DBG("bogus path '%s'\n", path);
|
|
continue;
|
|
}
|
|
|
|
src = test->power.led_on ? "1" : "0";
|
|
dst = _backskip_replace(path, '/', true, "/actual-%s.", my_id());
|
|
if (!dst)
|
|
continue;
|
|
|
|
status = mars_symlink(src, dst, NULL, 0);
|
|
MARS_DBG("status symlink '%s' -> '%s' status = %d\n", dst, src, status);
|
|
if (test->status_level > 1) {
|
|
char perc[8];
|
|
char *dst2 = path_make("%s.percent", dst);
|
|
if (likely(dst2)) {
|
|
snprintf(perc, sizeof(perc), "%d", test->power.percent_done);
|
|
status = mars_symlink(perc, dst2, NULL, 0);
|
|
MARS_DBG("percent symlink '%s' -> '%s' status = %d\n", dst2, src, status);
|
|
kfree(dst2);
|
|
}
|
|
}
|
|
kfree(dst);
|
|
}
|
|
up(&global->mutex);
|
|
}
|
|
|
|
#ifdef STAT_DEBUGGING
|
|
static
|
|
void _show_statist(struct mars_global *global)
|
|
{
|
|
struct list_head *tmp;
|
|
int dent_count = 0;
|
|
int brick_count = 0;
|
|
|
|
down(&global->mutex);
|
|
MARS_STAT("----------- lists:\n");
|
|
for (tmp = global->dent_anchor.next; tmp != &global->dent_anchor; tmp = tmp->next) {
|
|
struct mars_dent *dent;
|
|
dent = container_of(tmp, struct mars_dent, dent_link);
|
|
MARS_STAT("dent '%s'\n", dent->d_path);
|
|
dent_count++;
|
|
}
|
|
for (tmp = global->brick_anchor.next; tmp != &global->brick_anchor; tmp = tmp->next) {
|
|
struct mars_brick *test;
|
|
int i;
|
|
test = container_of(tmp, struct mars_brick, global_brick_link);
|
|
MARS_STAT("brick type = %s path = '%s' name = '%s' level = %d button = %d off = %d on = %d\n", test->type->type_name, test->brick_path, test->brick_name, test->status_level, test->power.button, test->power.led_off, test->power.led_on);
|
|
brick_count++;
|
|
for (i = 0; i < test->nr_inputs; i++) {
|
|
struct mars_input *input = test->inputs[i];
|
|
struct mars_output *output = input ? input->connect : NULL;
|
|
if (output) {
|
|
MARS_STAT(" input %d connected with %s path = '%s' name = '%s'\n", i, output->brick->type->type_name, output->brick->brick_path, output->brick->brick_name);
|
|
} else {
|
|
MARS_STAT(" input %d not connected\n", i);
|
|
}
|
|
}
|
|
}
|
|
up(&global->mutex);
|
|
|
|
MARS_INF("----------- STATISTICS: %d dents, %d bricks\n", dent_count, brick_count);
|
|
}
|
|
#endif
|
|
|
|
static int light_thread(void *data)
|
|
{
|
|
char *id = my_id();
|
|
int status = 0;
|
|
struct mars_global global = {
|
|
.dent_anchor = LIST_HEAD_INIT(global.dent_anchor),
|
|
.brick_anchor = LIST_HEAD_INIT(global.brick_anchor),
|
|
.global_power = {
|
|
.button = true,
|
|
},
|
|
.mutex = __SEMAPHORE_INITIALIZER(global.mutex, 1),
|
|
.main_event = __WAIT_QUEUE_HEAD_INITIALIZER(global.main_event),
|
|
};
|
|
mars_global = &global; // TODO: cleanup, avoid stack
|
|
|
|
if (!id || strlen(id) < 2) {
|
|
MARS_ERR("invalid hostname\n");
|
|
status = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
//fake_mm();
|
|
|
|
MARS_INF("-------- starting as host '%s' ----------\n", id);
|
|
|
|
while (global.global_power.button || !list_empty(&global.brick_anchor)) {
|
|
int status;
|
|
global.global_power.button = !kthread_should_stop();
|
|
|
|
status = mars_dent_work(&global, "/mars", sizeof(struct mars_dent), light_checker, light_worker, &global, 3);
|
|
MARS_DBG("worker status = %d\n", status);
|
|
|
|
_show_status(&global);
|
|
#ifdef STAT_DEBUGGING
|
|
_show_statist(&global);
|
|
#endif
|
|
|
|
msleep(1000);
|
|
|
|
wait_event_interruptible_timeout(global.main_event, global.main_trigger, 30 * HZ);
|
|
global.main_trigger = false;
|
|
}
|
|
|
|
done:
|
|
MARS_INF("-------- cleaning up ----------\n");
|
|
|
|
mars_free_dent_all(&global.dent_anchor);
|
|
|
|
mars_global = NULL;
|
|
main_thread = NULL;
|
|
|
|
MARS_INF("-------- done status = %d ----------\n", status);
|
|
//cleanup_mm();
|
|
return status;
|
|
}
|
|
|
|
static void __exit exit_light(void)
|
|
{
|
|
// TODO: make this thread-safe.
|
|
struct task_struct *thread = main_thread;
|
|
if (thread) {
|
|
main_thread = NULL;
|
|
MARS_DBG("====================== stopping everything...\n");
|
|
kthread_stop_nowait(thread);
|
|
mars_trigger();
|
|
kthread_stop(thread);
|
|
put_task_struct(thread);
|
|
MARS_DBG("====================== stopped everything.\n");
|
|
}
|
|
}
|
|
|
|
static int __init init_light(void)
|
|
{
|
|
struct task_struct *thread;
|
|
thread = kthread_create(light_thread, NULL, "mars_light");
|
|
if (IS_ERR(thread)) {
|
|
return PTR_ERR(thread);
|
|
}
|
|
get_task_struct(thread);
|
|
main_thread = thread;
|
|
wake_up_process(thread);
|
|
#if 1 // quirk: bump the memory reserve limits. TODO: determine right values.
|
|
{
|
|
extern int min_free_kbytes;
|
|
min_free_kbytes *= 4;
|
|
setup_per_zone_wmarks();
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
// force module loading
|
|
const void *dummy1 = &client_brick_type;
|
|
const void *dummy2 = &server_brick_type;
|
|
|
|
MODULE_DESCRIPTION("MARS Light");
|
|
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_light);
|
|
module_exit(exit_light);
|