11#include "fuse_config.h" 
   14#include "fuse_kernel.h" 
   30#define ENVNAME_THREAD_STACK "FUSE_THREAD_STACK" 
   32#define FUSE_LOOP_MT_V2_IDENTIFIER       INT_MAX - 2 
   33#define FUSE_LOOP_MT_DEF_CLONE_FD        0 
   34#define FUSE_LOOP_MT_DEF_MAX_THREADS 10 
   35#define FUSE_LOOP_MT_DEF_IDLE_THREADS -1  
   39#define FUSE_LOOP_MT_MAX_THREADS      (100U * 1000) 
   42        struct fuse_worker *prev;
 
   43        struct fuse_worker *next;
 
   57        struct fuse_session *se;
 
   58        struct fuse_worker main;
 
   67static struct fuse_chan *fuse_chan_new(
int fd)
 
   69        struct fuse_chan *ch = (
struct fuse_chan *) malloc(
sizeof(*ch));
 
   71                fuse_log(FUSE_LOG_ERR, 
"fuse: failed to allocate channel\n");
 
   75        memset(ch, 0, 
sizeof(*ch));
 
   78        pthread_mutex_init(&ch->lock, NULL);
 
   83struct fuse_chan *fuse_chan_get(
struct fuse_chan *ch)
 
   86        pthread_mutex_lock(&ch->lock);
 
   88        pthread_mutex_unlock(&ch->lock);
 
   93void fuse_chan_put(
struct fuse_chan *ch)
 
   97        pthread_mutex_lock(&ch->lock);
 
  100                pthread_mutex_unlock(&ch->lock);
 
  102                pthread_mutex_destroy(&ch->lock);
 
  105                pthread_mutex_unlock(&ch->lock);
 
  108static void list_add_worker(
struct fuse_worker *w, 
struct fuse_worker *next)
 
  110        struct fuse_worker *prev = next->prev;
 
  117static void list_del_worker(
struct fuse_worker *w)
 
  119        struct fuse_worker *prev = w->prev;
 
  120        struct fuse_worker *next = w->next;
 
  125static int fuse_loop_start_thread(
struct fuse_mt *mt);
 
  127static void *fuse_do_work(
void *data)
 
  129        struct fuse_worker *w = (
struct fuse_worker *) data;
 
  130        struct fuse_mt *mt = w->mt;
 
  136                pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
 
  137                res = fuse_session_receive_buf_int(mt->se, &w->fbuf, w->ch);
 
  138                pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
 
  149                pthread_mutex_lock(&mt->lock);
 
  151                        pthread_mutex_unlock(&mt->lock);
 
  160                        struct fuse_in_header *in = w->fbuf.mem;
 
  162                        if (in->opcode == FUSE_FORGET ||
 
  163                            in->opcode == FUSE_BATCH_FORGET)
 
  169                if (mt->numavail == 0 && mt->numworker < mt->max_threads)
 
  170                        fuse_loop_start_thread(mt);
 
  171                pthread_mutex_unlock(&mt->lock);
 
  173                fuse_session_process_buf_int(mt->se, &w->fbuf, w->ch);
 
  175                pthread_mutex_lock(&mt->lock);
 
  185                if (mt->max_idle != -1 && mt->numavail > mt->max_idle && mt->numworker > 1) {
 
  187                                pthread_mutex_unlock(&mt->lock);
 
  193                        pthread_mutex_unlock(&mt->lock);
 
  195                        pthread_detach(w->thread_id);
 
  197                        fuse_chan_put(w->ch);
 
  201                pthread_mutex_unlock(&mt->lock);
 
  204        sem_post(&mt->finish);
 
  209int fuse_start_thread(pthread_t *thread_id, 
void *(*func)(
void *), 
void *arg)
 
  221        pthread_attr_init(&attr);
 
  222        stack_size = getenv(ENVNAME_THREAD_STACK);
 
  223        if (stack_size && pthread_attr_setstacksize(&attr, atoi(stack_size)))
 
  224                fuse_log(FUSE_LOG_ERR, 
"fuse: invalid stack size: %s\n", stack_size);
 
  227        sigemptyset(&newset);
 
  228        sigaddset(&newset, SIGTERM);
 
  229        sigaddset(&newset, SIGINT);
 
  230        sigaddset(&newset, SIGHUP);
 
  231        sigaddset(&newset, SIGQUIT);
 
  232        pthread_sigmask(SIG_BLOCK, &newset, &oldset);
 
  233        res = pthread_create(thread_id, &attr, func, arg);
 
  234        pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 
  235        pthread_attr_destroy(&attr);
 
  237                fuse_log(FUSE_LOG_ERR, 
"fuse: error creating thread: %s\n",
 
  245static struct fuse_chan *fuse_clone_chan(
struct fuse_mt *mt)
 
  250        struct fuse_chan *newch;
 
  251        const char *devname = 
"/dev/fuse";
 
  256        clonefd = open(devname, O_RDWR | O_CLOEXEC);
 
  258                fuse_log(FUSE_LOG_ERR, 
"fuse: failed to open %s: %s\n", devname,
 
  262        fcntl(clonefd, F_SETFD, FD_CLOEXEC);
 
  264        masterfd = mt->se->fd;
 
  265        res = ioctl(clonefd, FUSE_DEV_IOC_CLONE, &masterfd);
 
  267                fuse_log(FUSE_LOG_ERR, 
"fuse: failed to clone device fd: %s\n",
 
  272        newch = fuse_chan_new(clonefd);
 
  279static int fuse_loop_start_thread(
struct fuse_mt *mt)
 
  283        struct fuse_worker *w = malloc(
sizeof(
struct fuse_worker));
 
  285                fuse_log(FUSE_LOG_ERR, 
"fuse: failed to allocate worker structure\n");
 
  288        memset(w, 0, 
sizeof(
struct fuse_worker));
 
  294                w->ch = fuse_clone_chan(mt);
 
  297                        fuse_log(FUSE_LOG_ERR, 
"fuse: trying to continue " 
  298                                "without -o clone_fd.\n");
 
  303        res = fuse_start_thread(&w->thread_id, fuse_do_work, w);
 
  305                fuse_chan_put(w->ch);
 
  309        list_add_worker(w, &mt->main);
 
  316static void fuse_join_worker(
struct fuse_mt *mt, 
struct fuse_worker *w)
 
  318        pthread_join(w->thread_id, NULL);
 
  319        pthread_mutex_lock(&mt->lock);
 
  321        pthread_mutex_unlock(&mt->lock);
 
  323        fuse_chan_put(w->ch);
 
  327int fuse_session_loop_mt_312(
struct fuse_session *se, 
struct fuse_loop_config *config);
 
  328FUSE_SYMVER(
"fuse_session_loop_mt_312", 
"fuse_session_loop_mt@@FUSE_3.12")
 
  329int fuse_session_loop_mt_312(struct fuse_session *se, struct 
fuse_loop_config *config)
 
  333        struct fuse_worker *w;
 
  334        int created_config = 0;
 
  337                err = fuse_loop_cfg_verify(config);
 
  347        memset(&mt, 0, 
sizeof(
struct fuse_mt));
 
  349        mt.clone_fd = config->clone_fd;
 
  353        mt.max_idle = config->max_idle_threads;
 
  354        mt.max_threads = config->max_threads;
 
  355        mt.main.thread_id = pthread_self();
 
  356        mt.main.prev = mt.main.next = &mt.main;
 
  357        sem_init(&mt.finish, 0, 0);
 
  358        pthread_mutex_init(&mt.lock, NULL);
 
  360        pthread_mutex_lock(&mt.lock);
 
  361        err = fuse_loop_start_thread(&mt);
 
  362        pthread_mutex_unlock(&mt.lock);
 
  366                        sem_wait(&mt.finish);
 
  368                pthread_mutex_lock(&mt.lock);
 
  369                for (w = mt.main.next; w != &mt.main; w = w->next)
 
  370                        pthread_cancel(w->thread_id);
 
  372                pthread_mutex_unlock(&mt.lock);
 
  374                while (mt.main.next != &mt.main)
 
  375                        fuse_join_worker(&mt, mt.main.next);
 
  380        pthread_mutex_destroy(&mt.lock);
 
  381        sem_destroy(&mt.finish);
 
  386        if (created_config) {
 
  394int fuse_session_loop_mt_32(
struct fuse_session *se, 
struct fuse_loop_config_v1 *config_v1);
 
  395FUSE_SYMVER(
"fuse_session_loop_mt_32", 
"fuse_session_loop_mt@FUSE_3.2")
 
  396int fuse_session_loop_mt_32(struct fuse_session *se, struct fuse_loop_config_v1 *config_v1)
 
  401        if (config_v1 != NULL) {
 
  410        err = fuse_session_loop_mt_312(se, config);
 
  418int fuse_session_loop_mt_31(
struct fuse_session *se, 
int clone_fd);
 
  419FUSE_SYMVER(
"fuse_session_loop_mt_31", 
"fuse_session_loop_mt@FUSE_3.0")
 
  420int fuse_session_loop_mt_31(struct fuse_session *se, 
int clone_fd)
 
  425        return fuse_session_loop_mt_312(se, config);
 
  434        config->version_id       = FUSE_LOOP_MT_V2_IDENTIFIER;
 
  436        config->
max_threads      = FUSE_LOOP_MT_DEF_MAX_THREADS;
 
  437        config->
clone_fd         = FUSE_LOOP_MT_DEF_CLONE_FD;
 
  449        if (config->version_id != FUSE_LOOP_MT_V2_IDENTIFIER)
 
  456                           struct fuse_loop_config_v1 *v1_conf)
 
  466        if (value > FUSE_LOOP_MT_MAX_THREADS) {
 
  467                if (value != UINT_MAX)
 
  469                                 "Ignoring invalid max threads value " 
  470                                 "%u > max (%u).\n", value,
 
  471                                 FUSE_LOOP_MT_MAX_THREADS);
 
void fuse_loop_cfg_convert(struct fuse_loop_config *config, struct fuse_loop_config_v1 *v1_conf)
void fuse_loop_cfg_set_idle_threads(struct fuse_loop_config *config, unsigned int value)
struct fuse_loop_config * fuse_loop_cfg_create(void)
void fuse_loop_cfg_set_clone_fd(struct fuse_loop_config *config, unsigned int value)
void fuse_loop_cfg_destroy(struct fuse_loop_config *config)
void fuse_loop_cfg_set_max_threads(struct fuse_loop_config *config, unsigned int value)
void fuse_log(enum fuse_log_level level, const char *fmt,...)
void fuse_session_exit(struct fuse_session *se)
int fuse_session_exited(struct fuse_session *se)
void fuse_session_reset(struct fuse_session *se)
unsigned int max_idle_threads