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main.c
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/*
* Copyright (c) 2014 Red Hat, Inc.
*
* This file is licensed to you under your choice of the GNU Lesser
* General Public License, version 2.1 or any later version (LGPLv2.1 or
* later), or the Apache License 2.0.
*/
/*
* A daemon that supports a simplified interface for writing TCMU
* handlers.
*/
#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <assert.h>
#include <dlfcn.h>
#include <pthread.h>
#include <signal.h>
#include <glib.h>
#include <glib-unix.h>
#include <gio/gio.h>
#include <getopt.h>
#include <poll.h>
#include <scsi/scsi.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <libkmod.h>
#include <sys/utsname.h>
#include "target_core_user_local.h"
#include "darray.h"
#include "tcmu-runner.h"
#include "tcmur_aio.h"
#include "tcmur_device.h"
#include "tcmur_cmd_handler.h"
#include "libtcmu.h"
#include "tcmuhandler-generated.h"
#include "version.h"
#include "libtcmu_config.h"
#include "libtcmu_log.h"
# define TCMU_LOCK_FILE "/var/run/lock/tcmu.lock"
static char *handler_path = DEFAULT_HANDLER_PATH;
static struct tcmu_config *tcmu_cfg;
darray(struct tcmur_handler *) g_runner_handlers = darray_new();
struct tcmur_handler *tcmu_get_runner_handler(struct tcmu_device *dev)
{
struct tcmulib_handler *handler = tcmu_dev_get_handler(dev);
return handler->hm_private;
}
int tcmur_register_handler(struct tcmur_handler *handler)
{
struct tcmur_handler *h;
int i;
for (i = 0; i < darray_size(g_runner_handlers); i++) {
h = darray_item(g_runner_handlers, i);
if (!strcmp(h->subtype, handler->subtype)) {
tcmu_err("Handler %s has already been registered\n",
handler->subtype);
return -1;
}
}
darray_append(g_runner_handlers, handler);
return 0;
}
static int tcmur_register_dbus_handler(struct tcmur_handler *handler)
{
assert(handler->_is_dbus_handler == true);
return tcmur_register_handler(handler);
}
bool tcmur_unregister_handler(struct tcmur_handler *handler)
{
int i;
for (i = 0; i < darray_size(g_runner_handlers); i++) {
if (darray_item(g_runner_handlers, i) == handler) {
darray_remove(g_runner_handlers, i);
return true;
}
}
return false;
}
static void free_dbus_handler(struct tcmur_handler *handler)
{
g_free((char*)handler->opaque);
g_free((char*)handler->subtype);
g_free((char*)handler->cfg_desc);
g_free(handler);
}
static bool tcmur_unregister_dbus_handler(struct tcmur_handler *handler)
{
bool ret = false;
assert(handler->_is_dbus_handler == true);
ret = tcmur_unregister_handler(handler);
if (ret == true) {
free_dbus_handler(handler);
}
return ret;
}
static int is_handler(const struct dirent *dirent)
{
if (strncmp(dirent->d_name, "handler_", 8))
return 0;
return 1;
}
static int open_handlers(void)
{
struct dirent **dirent_list;
int num_handlers;
int num_good = 0;
char *error;
int i;
num_handlers = scandir(handler_path, &dirent_list, is_handler, alphasort);
if (num_handlers == -1)
return -1;
for (i = 0; i < num_handlers; i++) {
char *path;
void *handle;
int (*handler_init)(void);
int ret;
ret = asprintf(&path, "%s/%s", handler_path, dirent_list[i]->d_name);
if (ret == -1) {
tcmu_err("ENOMEM\n");
continue;
}
handle = dlopen(path, RTLD_NOW|RTLD_LOCAL);
if (!handle) {
tcmu_err("Could not open handler at %s: %s\n", path, dlerror());
free(path);
continue;
}
dlerror();
handler_init = dlsym(handle, "handler_init");
if ((error = dlerror())) {
tcmu_err("dlsym failure on %s: (%s)\n", path, error);
free(path);
continue;
}
ret = handler_init();
if (ret) {
tcmu_err("handler init failed on path %s\n", path);
free(path);
continue;
}
free(path);
if (ret == 0)
num_good++;
}
for (i = 0; i < num_handlers; i++)
free(dirent_list[i]);
free(dirent_list);
return num_good;
}
static gboolean handle_sig(gpointer user_data)
{
tcmu_dbg("Have received signal!\n");
g_main_loop_quit((GMainLoop*)user_data);
return G_SOURCE_CONTINUE;
}
static gboolean handle_sighup(gpointer user_data)
{
tcmu_resetup_log_file(NULL);
return G_SOURCE_CONTINUE;
}
gboolean tcmulib_callback(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
struct tcmulib_context *ctx = data;
tcmulib_master_fd_ready(ctx);
return TRUE;
}
static GDBusObjectManagerServer *manager = NULL;
static gboolean
on_check_config(TCMUService1 *interface,
GDBusMethodInvocation *invocation,
gchar *cfgstring,
gpointer user_data)
{
struct tcmur_handler *handler = user_data;
char *reason = NULL;
bool str_ok = true;
if (handler->check_config)
str_ok = handler->check_config(cfgstring, &reason);
if (str_ok)
reason = "success";
g_dbus_method_invocation_return_value(invocation,
g_variant_new("(bs)", str_ok, reason ? : "unknown"));
if (!str_ok)
free(reason);
return TRUE;
}
static void
dbus_export_handler(struct tcmur_handler *handler, GCallback check_config)
{
GDBusObjectSkeleton *object;
char obj_name[128];
TCMUService1 *interface;
snprintf(obj_name, sizeof(obj_name), "/org/kernel/TCMUService1/%s",
handler->subtype);
object = g_dbus_object_skeleton_new(obj_name);
interface = tcmuservice1_skeleton_new();
g_dbus_object_skeleton_add_interface(object, G_DBUS_INTERFACE_SKELETON(interface));
g_signal_connect(interface,
"handle-check-config",
check_config,
handler); /* user_data */
tcmuservice1_set_config_desc(interface, handler->cfg_desc);
g_dbus_object_manager_server_export(manager, G_DBUS_OBJECT_SKELETON(object));
g_object_unref(object);
}
static bool
dbus_unexport_handler(struct tcmur_handler *handler)
{
char obj_name[128];
snprintf(obj_name, sizeof(obj_name), "/org/kernel/TCMUService1/%s",
handler->subtype);
return g_dbus_object_manager_server_unexport(manager, obj_name) == TRUE;
}
struct dbus_info {
guint watcher_id;
/* The RegisterHandler invocation on
* org.kernel.TCMUService1.HandlerManager1 interface. */
GDBusMethodInvocation *register_invocation;
/* Connection to the handler's bus_name. */
GDBusConnection *connection;
};
static int dbus_handler_open(struct tcmu_device *dev, bool reopen)
{
return -1;
}
static void dbus_handler_close(struct tcmu_device *dev)
{
/* nop */
}
static int dbus_handler_handle_cmd(struct tcmu_device *dev,
struct tcmulib_cmd *cmd)
{
abort();
}
static gboolean
on_dbus_check_config(TCMUService1 *interface,
GDBusMethodInvocation *invocation,
gchar *cfgstring,
gpointer user_data)
{
char *bus_name, *obj_name;
struct tcmur_handler *handler = user_data;
GDBusConnection *connection;
GError *error = NULL;
GVariant *result;
bus_name = g_strdup_printf("org.kernel.TCMUService1.HandlerManager1.%s",
handler->subtype);
obj_name = g_strdup_printf("/org/kernel/TCMUService1/HandlerManager1/%s",
handler->subtype);
connection = g_dbus_method_invocation_get_connection(invocation);
result = g_dbus_connection_call_sync(connection,
bus_name,
obj_name,
"org.kernel.TCMUService1",
"CheckConfig",
g_variant_new("(s)", cfgstring),
NULL, G_DBUS_CALL_FLAGS_NONE, -1,
NULL, &error);
if (result)
g_dbus_method_invocation_return_value(invocation, result);
else
g_dbus_method_invocation_return_value(invocation,
g_variant_new("(bs)", FALSE, error->message));
g_free(bus_name);
g_free(obj_name);
return TRUE;
}
static void
on_handler_appeared(GDBusConnection *connection,
const gchar *name,
const gchar *name_owner,
gpointer user_data)
{
struct tcmur_handler *handler = user_data;
struct dbus_info *info = handler->opaque;
if (info->register_invocation) {
info->connection = connection;
tcmur_register_dbus_handler(handler);
dbus_export_handler(handler, G_CALLBACK(on_dbus_check_config));
g_dbus_method_invocation_return_value(info->register_invocation,
g_variant_new("(bs)", TRUE, "succeeded"));
info->register_invocation = NULL;
}
}
static void
on_handler_vanished(GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
struct tcmur_handler *handler = user_data;
struct dbus_info *info = handler->opaque;
if (info->register_invocation) {
char *reason;
reason = g_strdup_printf("Cannot find handler bus name: "
"org.kernel.TCMUService1.HandlerManager1.%s",
handler->subtype);
g_dbus_method_invocation_return_value(info->register_invocation,
g_variant_new("(bs)", FALSE, reason));
g_free(reason);
}
dbus_unexport_handler(handler);
g_bus_unwatch_name(info->watcher_id);
tcmur_unregister_dbus_handler(handler);
}
static gboolean
on_register_handler(TCMUService1HandlerManager1 *interface,
GDBusMethodInvocation *invocation,
gchar *subtype,
gchar *cfg_desc,
gpointer user_data)
{
struct tcmur_handler *handler;
struct dbus_info *info;
char *bus_name;
bus_name = g_strdup_printf("org.kernel.TCMUService1.HandlerManager1.%s",
subtype);
handler = g_new0(struct tcmur_handler, 1);
handler->subtype = g_strdup(subtype);
handler->cfg_desc = g_strdup(cfg_desc);
handler->open = dbus_handler_open;
handler->close = dbus_handler_close;
handler->handle_cmd = dbus_handler_handle_cmd;
info = g_new0(struct dbus_info, 1);
handler->opaque = info;
handler->_is_dbus_handler = 1;
info->register_invocation = invocation;
info->watcher_id = g_bus_watch_name(G_BUS_TYPE_SYSTEM,
bus_name,
G_BUS_NAME_WATCHER_FLAGS_NONE,
on_handler_appeared,
on_handler_vanished,
handler,
NULL);
if (info->watcher_id == 0) {
// probably an invalid name, roll back and report an error
free_dbus_handler(handler);
g_dbus_method_invocation_return_value(invocation,
g_variant_new("(bs)", FALSE,
"failed to watch for DBus handler name"));
}
g_free(bus_name);
return TRUE;
}
void dbus_handler_manager1_init(GDBusConnection *connection)
{
GError *error = NULL;
TCMUService1HandlerManager1 *interface;
gboolean ret;
interface = tcmuservice1_handler_manager1_skeleton_new();
ret = g_dbus_interface_skeleton_export(
G_DBUS_INTERFACE_SKELETON(interface),
connection,
"/org/kernel/TCMUService1/HandlerManager1",
&error);
g_signal_connect(interface,
"handle-register-handler",
G_CALLBACK (on_register_handler),
NULL);
if (!ret)
tcmu_err("Handler manager export failed: %s\n",
error ? error->message : "unknown error");
if (error)
g_error_free(error);
}
static void dbus_bus_acquired(GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
struct tcmur_handler **handler;
tcmu_dbg("bus %s acquired\n", name);
manager = g_dbus_object_manager_server_new("/org/kernel/TCMUService1");
darray_foreach(handler, g_runner_handlers) {
dbus_export_handler(*handler, G_CALLBACK(on_check_config));
}
dbus_handler_manager1_init(connection);
g_dbus_object_manager_server_set_connection(manager, connection);
}
static void dbus_name_acquired(GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
tcmu_dbg("name %s acquired\n", name);
}
static void dbus_name_lost(GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
tcmu_dbg("name lost\n");
}
static int load_our_module(void)
{
struct kmod_list *list = NULL, *itr;
struct kmod_ctx *ctx;
struct stat sb;
struct utsname u;
int ret;
ctx = kmod_new(NULL, NULL);
if (!ctx) {
tcmu_err("kmod_new() failed: %m\n");
return -1;
}
ret = kmod_module_new_from_lookup(ctx, "target_core_user", &list);
if (ret < 0) {
/* In some environments like containers, /lib/modules/`uname -r`
* will not exist, in such cases the load module job be taken
* care by admin, either by manual load or makesure it's builtin
*/
if (ENOENT == errno) {
if (uname(&u) < 0) {
tcmu_err("uname() failed: %m\n");
} else {
tcmu_info("no modules directory '/lib/modules/%s', checking module target_core_user entry in '/sys/modules/'\n",
u.release);
ret = stat(CFGFS_TARGET_MOD, &sb);
if (!ret) {
tcmu_dbg("Module target_core_user already loaded\n");
} else {
tcmu_err("stat() on '%s' failed: %m\n",
CFGFS_TARGET_MOD);
}
}
} else {
tcmu_err("kmod_module_new_from_lookup() failed to lookup alias target_core_use %m\n");
}
kmod_unref(ctx);
return ret;
}
if (!list) {
tcmu_err("kmod_module_new_from_lookup() failed to find module target_core_user\n");
kmod_unref(ctx);
return -ENOENT;
}
kmod_list_foreach(itr, list) {
int state, err;
struct kmod_module *mod = kmod_module_get_module(itr);
state = kmod_module_get_initstate(mod);
switch (state) {
case KMOD_MODULE_BUILTIN:
tcmu_info("Module '%s' is builtin\n",
kmod_module_get_name(mod));
break;
case KMOD_MODULE_LIVE:
tcmu_dbg("Module '%s' is already loaded\n",
kmod_module_get_name(mod));
break;
default:
err = kmod_module_probe_insert_module(mod,
KMOD_PROBE_APPLY_BLACKLIST,
NULL, NULL, NULL, NULL);
if (err == 0) {
tcmu_info("Inserted module '%s'\n",
kmod_module_get_name(mod));
} else if (err < 0) {
tcmu_err("Failed to insert '%s': %s\n",
kmod_module_get_name(mod), strerror(-err));
ret = err;
} else {
switch (err) {
case KMOD_PROBE_APPLY_BLACKLIST:
tcmu_err("Module '%s' is blacklisted\n",
kmod_module_get_name(mod));
break;
default:
tcmu_err("Module '%s' is stopped by a reason: 0x%x\n",
kmod_module_get_name(mod), err);
break;
}
ret = -EIO;
}
}
kmod_module_unref(mod);
}
kmod_module_unref_list(list);
kmod_unref(ctx);
return ret;
}
/*
* tcmur_stop_device - stop device for removal
* @arg: tcmu_device to stop
*
* Stop internal tcmur device operations like lock and recovery and close
* the device. Running IO must be stopped before calling this.
*/
static void tcmur_stop_device(void *arg)
{
struct tcmu_device *dev = arg;
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
bool is_open = false;
pthread_mutex_lock(&rdev->state_lock);
/* check if this was already called due to thread cancelation */
if (rdev->flags & TCMUR_DEV_FLAG_STOPPED) {
pthread_mutex_unlock(&rdev->state_lock);
return;
}
rdev->flags |= TCMUR_DEV_FLAG_STOPPING;
pthread_mutex_unlock(&rdev->state_lock);
/*
* The lock thread can fire off the recovery thread, so make sure
* it is done first.
*/
tcmu_cancel_lock_thread(dev);
tcmu_cancel_recovery(dev);
tcmu_release_dev_lock(dev);
pthread_mutex_lock(&rdev->state_lock);
if (rdev->flags & TCMUR_DEV_FLAG_IS_OPEN) {
rdev->flags &= ~TCMUR_DEV_FLAG_IS_OPEN;
is_open = true;
}
pthread_mutex_unlock(&rdev->state_lock);
if (is_open)
rhandler->close(dev);
pthread_mutex_lock(&rdev->state_lock);
rdev->flags |= TCMUR_DEV_FLAG_STOPPED;
pthread_mutex_unlock(&rdev->state_lock);
tcmu_dev_dbg(dev, "cmdproc cleanup done\n");
}
static void *tcmur_cmdproc_thread(void *arg)
{
struct tcmu_device *dev = arg;
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
struct pollfd pfd;
int ret;
bool dev_stopping = false;
pthread_cleanup_push(tcmur_stop_device, dev);
while (1) {
int completed = 0;
struct tcmulib_cmd *cmd;
tcmulib_processing_start(dev);
while (!dev_stopping && (cmd = tcmulib_get_next_command(dev)) != NULL) {
if (tcmu_get_log_level() == TCMU_LOG_DEBUG_SCSI_CMD)
tcmu_cdb_print_info(dev, cmd, NULL);
if (tcmur_handler_is_passthrough_only(rhandler))
ret = tcmur_cmd_passthrough_handler(dev, cmd);
else
ret = tcmur_generic_handle_cmd(dev, cmd);
if (ret == TCMU_STS_NOT_HANDLED)
tcmu_cdb_print_info(dev, cmd, "is not supported");
/*
* command (processing) completion is called in the following
* scenarios:
* - handle_cmd: synchronous handlers
* - generic_handle_cmd: non tcmur handler calls (see generic_cmd())
* and on errors when calling tcmur handler.
*/
if (ret != TCMU_STS_ASYNC_HANDLED) {
completed = 1;
tcmur_command_complete(dev, cmd, ret);
}
}
if (completed)
tcmulib_processing_complete(dev);
pfd.fd = tcmu_dev_get_fd(dev);
pfd.events = POLLIN;
pfd.revents = 0;
/* Use ppoll instead poll to avoid poll call reschedules during signal
* handling. If we were removing a device, then the uio device's memory
* could be freed, but the poll would be rescheduled and end up accessing
* the released device. */
ret = ppoll(&pfd, 1, NULL, NULL);
if (ret == -1) {
tcmu_err("ppoll() returned %d\n", ret);
break;
}
if (pfd.revents != POLLIN) {
tcmu_err("ppoll received unexpected revent: 0x%x\n", pfd.revents);
break;
}
/*
* LIO will wait for outstanding requests and prevent new ones
* from being sent to runner during device removal, but if the
* tcmu cmd_time_out has fired tcmu-runner may still be executing
* requests that LIO has completed. We only need to wait for replies
* for outstanding requests so throttle the cmdproc thread now.
*/
pthread_mutex_lock(&rdev->state_lock);
if (rdev->flags & TCMUR_DEV_FLAG_STOPPING)
dev_stopping = true;
pthread_mutex_unlock(&rdev->state_lock);
}
/*
* If we are doing a clean shutdown via dev_removed the
* removing thread will call the cleanup function when
* it has stopped and flushed the device.
*/
pthread_cleanup_pop(0);
return NULL;
}
static int dev_resize(struct tcmu_device *dev, struct tcmulib_cfg_info *cfg)
{
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
int ret;
if (tcmu_dev_get_num_lbas(dev) * tcmu_dev_get_block_size(dev) ==
cfg->data.dev_size)
return 0;
ret = rhandler->reconfig(dev, cfg);
if (ret)
return ret;
tcmu_dev_set_num_lbas(dev, cfg->data.dev_size /
tcmu_dev_get_block_size(dev));
tcmur_set_pending_ua(dev, TCMUR_UA_DEV_SIZE_CHANGED);
return 0;
}
static int dev_reconfig(struct tcmu_device *dev, struct tcmulib_cfg_info *cfg)
{
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
if (!rhandler->reconfig)
return -EOPNOTSUPP;
switch (cfg->type) {
case TCMULIB_CFG_DEV_SIZE:
return dev_resize(dev, cfg);
default:
return rhandler->reconfig(dev, cfg);
}
}
static int dev_added(struct tcmu_device *dev)
{
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
struct list_head group_list;
struct tcmur_device *rdev;
int32_t block_size, max_sectors;
int64_t dev_size;
int ret;
rdev = calloc(1, sizeof(*rdev));
if (!rdev)
return -ENOMEM;
tcmu_dev_set_private(dev, rdev);
list_node_init(&rdev->recovery_entry);
rdev->dev = dev;
ret = -EINVAL;
block_size = tcmu_cfgfs_dev_get_attr_int(dev, "hw_block_size");
if (block_size <= 0) {
tcmu_dev_err(dev, "Could not get hw_block_size\n");
goto free_rdev;
}
tcmu_dev_set_block_size(dev, block_size);
dev_size = tcmu_cfgfs_dev_get_info_u64(dev, "Size", &ret);
if (ret < 0) {
tcmu_dev_err(dev, "Could not get device size\n");
goto free_rdev;
}
tcmu_dev_set_num_lbas(dev, dev_size / block_size);
max_sectors = tcmu_cfgfs_dev_get_attr_int(dev, "hw_max_sectors");
if (max_sectors < 0)
goto free_rdev;
tcmu_dev_set_max_xfer_len(dev, max_sectors);
/*
* Set the optimal unmap granularity to max xfer len. Optimal unmap
* alignment starts at the begining of the device. Handlers can
* override in their open function.
*/
tcmu_dev_set_max_unmap_len(dev, VPD_MAX_UNMAP_LBA_COUNT);
tcmu_dev_set_opt_unmap_gran(dev, max_sectors, true);
tcmu_dev_set_unmap_gran_align(dev, 0);
/*
* By default we will try to do RWs for xcopys in max_sector chunks,
* but handlers that can do larger internal IOs should override.
*/
tcmu_dev_set_opt_xcopy_rw_len(dev, max_sectors);
if (rhandler->unmap)
tcmu_dev_set_unmap_enabled(dev, true);
tcmu_dev_dbg(dev, "Got block_size %d, size in bytes %"PRId64"\n",
block_size, dev_size);
ret = pthread_spin_init(&rdev->lock, 0);
if (ret) {
ret = -ret;
goto free_rdev;
}
ret = pthread_mutex_init(&rdev->caw_lock, NULL);
if (ret) {
ret = -ret;
goto cleanup_dev_lock;
}
ret = pthread_mutex_init(&rdev->format_lock, NULL);
if (ret) {
ret = -ret;
goto cleanup_caw_lock;
}
ret = pthread_mutex_init(&rdev->state_lock, NULL);
if (ret) {
ret = -ret;
goto cleanup_format_lock;
}
ret = setup_io_work_queue(dev);
if (ret < 0)
goto cleanup_state_lock;
ret = setup_aio_tracking(rdev);
if (ret < 0)
goto cleanup_io_work_queue;
ret = rhandler->open(dev, false);
if (ret)
goto cleanup_aio_tracking;
/*
* On the initial creation ALUA will probably not yet have been setup,
* but for reopens it will be so we need to sync our failover state.
*/
list_head_init(&group_list);
tcmu_get_alua_grps(dev, &group_list);
tcmu_release_alua_grps(&group_list);
rdev->flags |= TCMUR_DEV_FLAG_IS_OPEN;
ret = pthread_cond_init(&rdev->lock_cond, NULL);
if (ret) {
ret = -ret;
goto close_dev;
}
ret = pthread_create(&rdev->cmdproc_thread, NULL, tcmur_cmdproc_thread,
dev);
if (ret) {
ret = -ret;
goto cleanup_lock_cond;
}
return 0;
cleanup_lock_cond:
pthread_cond_destroy(&rdev->lock_cond);
close_dev:
rhandler->close(dev);
cleanup_aio_tracking:
cleanup_aio_tracking(rdev);
cleanup_io_work_queue:
cleanup_io_work_queue(dev, true);
cleanup_state_lock:
pthread_mutex_destroy(&rdev->state_lock);
cleanup_format_lock:
pthread_mutex_destroy(&rdev->format_lock);
cleanup_caw_lock:
pthread_mutex_destroy(&rdev->caw_lock);
cleanup_dev_lock:
pthread_spin_destroy(&rdev->lock);
free_rdev:
free(rdev);
return ret;
}
static void dev_removed(struct tcmu_device *dev)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
int ret;
pthread_mutex_lock(&rdev->state_lock);
rdev->flags |= TCMUR_DEV_FLAG_STOPPING;
pthread_mutex_unlock(&rdev->state_lock);
/*
* The order of cleaning up worker threads and calling ->removed()
* is important: for sync handlers, the worker thread needs to be
* terminated before removing the handler (i.e., calling handlers
* ->close() callout) in order to ensure that no handler callouts
* are getting invoked when shutting down the handler.
*/
cleanup_io_work_queue_threads(dev);
if (aio_wait_for_empty_queue(rdev))
tcmu_dev_err(dev, "could not flush queue.\n");
tcmu_thread_cancel(rdev->cmdproc_thread);
tcmur_stop_device(dev);
cleanup_io_work_queue(dev, false);
cleanup_aio_tracking(rdev);
ret = pthread_cond_destroy(&rdev->lock_cond);
if (ret != 0)
tcmu_err("could not cleanup lock cond %d\n", ret);
ret = pthread_mutex_destroy(&rdev->state_lock);
if (ret != 0)
tcmu_err("could not cleanup state lock %d\n", ret);
ret = pthread_mutex_destroy(&rdev->format_lock);
if (ret != 0)
tcmu_err("could not cleanup format lock %d\n", ret);
ret = pthread_mutex_destroy(&rdev->caw_lock);
if (ret != 0)
tcmu_err("could not cleanup caw lock %d\n", ret);
ret = pthread_spin_destroy(&rdev->lock);
if (ret != 0)
tcmu_err("could not cleanup mailbox lock %d\n", ret);
free(rdev);
tcmu_dev_dbg(dev, "removed from tcmu-runner\n");
}
#define TCMUR_MIN_OPEN_FD 65536
#define TCMUR_MAX_OPEN_FD 1048576
static int tcmu_set_max_fd_limit(const int nr_files)
{
struct rlimit old_rlim, new_rlim;
int ret;
ret = getrlimit(RLIMIT_NOFILE, &old_rlim);
if (ret == -1) {
tcmu_err("failed to get max open fd limit: %m\n");
return ret;
}
if (old_rlim.rlim_cur < nr_files) {
new_rlim.rlim_cur = nr_files;
if (old_rlim.rlim_max < nr_files) {
new_rlim.rlim_max = nr_files;
} else {
new_rlim.rlim_max = old_rlim.rlim_max;
}
ret = setrlimit(RLIMIT_NOFILE, &new_rlim);
if (ret == -1) {
tcmu_err("failed to set max open fd to [soft: %lld hard: %lld] %m\n",
(long long int)new_rlim.rlim_cur,
(long long int)new_rlim.rlim_max);
return ret;
}
tcmu_info("max open fd set to [soft: %lld hard: %lld]\n",
(long long int)new_rlim.rlim_cur,
(long long int)new_rlim.rlim_max);
return 0;
}
tcmu_info("max open fd remain [soft: %lld hard: %lld]\n",
(long long int)old_rlim.rlim_cur,
(long long int)old_rlim.rlim_max);
return 0;
}
static void usage(void) {
printf("\nusage:\n");
printf("\ttcmu-runner [options]\n");
printf("\noptions:\n");
printf("\t-h, --help: print this message and exit\n");
printf("\t-V, --version: print version and exit\n");
printf("\t-d, --debug: enable debug messages\n");
printf("\t-f, --nofile: set maximum file number could be opened\n");
printf("\t\tdefault will be as the systemd or the shell's limitation\n");
printf("\t--handler-path: set path to search for handler modules\n");
printf("\t\tdefault is %s\n", DEFAULT_HANDLER_PATH);
printf("\t-l, --tcmu-log-dir: tcmu log dir\n");
printf("\t\tdefault is %s\n", TCMU_LOG_DIR_DEFAULT);
printf("\n");
}
static struct option long_options[] = {
{"debug", no_argument, 0, 'd'},
{"handler-path", required_argument, 0, 0},
{"tcmu-log-dir", required_argument, 0, 'l'},
{"nofile", required_argument, 0, 'f'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},