12 #include "fuse_lowlevel.h"    13 #include "fuse_misc.h"    14 #include "fuse_kernel.h"    22 #include <semaphore.h>    25 #include <sys/ioctl.h>    29 #define ENVNAME_THREAD_STACK "FUSE_THREAD_STACK"    32         struct fuse_worker *prev;
    33         struct fuse_worker *next;
    47         struct fuse_session *se;
    48         struct fuse_worker main;
    56 static struct fuse_chan *fuse_chan_new(
int fd)
    58         struct fuse_chan *ch = (
struct fuse_chan *) malloc(
sizeof(*ch));
    60                 fuse_log(FUSE_LOG_ERR, 
"fuse: failed to allocate channel\n");
    64         memset(ch, 0, 
sizeof(*ch));
    67         pthread_mutex_init(&ch->lock, NULL);
    72 struct fuse_chan *fuse_chan_get(
struct fuse_chan *ch)
    75         pthread_mutex_lock(&ch->lock);
    77         pthread_mutex_unlock(&ch->lock);
    82 void fuse_chan_put(
struct fuse_chan *ch)
    86         pthread_mutex_lock(&ch->lock);
    89                 pthread_mutex_unlock(&ch->lock);
    91                 pthread_mutex_destroy(&ch->lock);
    94                 pthread_mutex_unlock(&ch->lock);
    97 static void list_add_worker(
struct fuse_worker *w, 
struct fuse_worker *next)
    99         struct fuse_worker *prev = next->prev;
   106 static void list_del_worker(
struct fuse_worker *w)
   108         struct fuse_worker *prev = w->prev;
   109         struct fuse_worker *next = w->next;
   114 static int fuse_loop_start_thread(
struct fuse_mt *mt);
   116 static void *fuse_do_work(
void *data)
   118         struct fuse_worker *w = (
struct fuse_worker *) data;
   119         struct fuse_mt *mt = w->mt;
   125                 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
   126                 res = fuse_session_receive_buf_int(mt->se, &w->fbuf, w->ch);
   127                 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
   138                 pthread_mutex_lock(&mt->lock);
   140                         pthread_mutex_unlock(&mt->lock);
   149                         struct fuse_in_header *in = w->fbuf.mem;
   151                         if (in->opcode == FUSE_FORGET ||
   152                             in->opcode == FUSE_BATCH_FORGET)
   158                 if (mt->numavail == 0)
   159                         fuse_loop_start_thread(mt);
   160                 pthread_mutex_unlock(&mt->lock);
   162                 fuse_session_process_buf_int(mt->se, &w->fbuf, w->ch);
   164                 pthread_mutex_lock(&mt->lock);
   167                 if (mt->numavail > mt->max_idle) {
   169                                 pthread_mutex_unlock(&mt->lock);
   175                         pthread_mutex_unlock(&mt->lock);
   177                         pthread_detach(w->thread_id);
   179                         fuse_chan_put(w->ch);
   183                 pthread_mutex_unlock(&mt->lock);
   186         sem_post(&mt->finish);
   191 int fuse_start_thread(pthread_t *thread_id, 
void *(*func)(
void *), 
void *arg)
   200         pthread_attr_init(&attr);
   201         stack_size = getenv(ENVNAME_THREAD_STACK);
   202         if (stack_size && pthread_attr_setstacksize(&attr, atoi(stack_size)))
   203                 fuse_log(FUSE_LOG_ERR, 
"fuse: invalid stack size: %s\n", stack_size);
   206         sigemptyset(&newset);
   207         sigaddset(&newset, SIGTERM);
   208         sigaddset(&newset, SIGINT);
   209         sigaddset(&newset, SIGHUP);
   210         sigaddset(&newset, SIGQUIT);
   211         pthread_sigmask(SIG_BLOCK, &newset, &oldset);
   212         res = pthread_create(thread_id, &attr, func, arg);
   213         pthread_sigmask(SIG_SETMASK, &oldset, NULL);
   214         pthread_attr_destroy(&attr);
   216                 fuse_log(FUSE_LOG_ERR, 
"fuse: error creating thread: %s\n",
   224 static struct fuse_chan *fuse_clone_chan(
struct fuse_mt *mt)
   229         struct fuse_chan *newch;
   230         const char *devname = 
"/dev/fuse";
   235         clonefd = open(devname, O_RDWR | O_CLOEXEC);
   237                 fuse_log(FUSE_LOG_ERR, 
"fuse: failed to open %s: %s\n", devname,
   241         fcntl(clonefd, F_SETFD, FD_CLOEXEC);
   243         masterfd = mt->se->fd;
   244         res = ioctl(clonefd, FUSE_DEV_IOC_CLONE, &masterfd);
   246                 fuse_log(FUSE_LOG_ERR, 
"fuse: failed to clone device fd: %s\n",
   251         newch = fuse_chan_new(clonefd);
   258 static int fuse_loop_start_thread(
struct fuse_mt *mt)
   262         struct fuse_worker *w = malloc(
sizeof(
struct fuse_worker));
   264                 fuse_log(FUSE_LOG_ERR, 
"fuse: failed to allocate worker structure\n");
   267         memset(w, 0, 
sizeof(
struct fuse_worker));
   273                 w->ch = fuse_clone_chan(mt);
   276                         fuse_log(FUSE_LOG_ERR, 
"fuse: trying to continue "   277                                 "without -o clone_fd.\n");
   282         res = fuse_start_thread(&w->thread_id, fuse_do_work, w);
   284                 fuse_chan_put(w->ch);
   288         list_add_worker(w, &mt->main);
   295 static void fuse_join_worker(
struct fuse_mt *mt, 
struct fuse_worker *w)
   297         pthread_join(w->thread_id, NULL);
   298         pthread_mutex_lock(&mt->lock);
   300         pthread_mutex_unlock(&mt->lock);
   302         fuse_chan_put(w->ch);
   306 FUSE_SYMVER(
"fuse_session_loop_mt_32", 
"fuse_session_loop_mt@@FUSE_3.2")
   307 int fuse_session_loop_mt_32(struct fuse_session *se, struct 
fuse_loop_config *config)
   311         struct fuse_worker *w;
   313         memset(&mt, 0, 
sizeof(
struct fuse_mt));
   315         mt.clone_fd = config->clone_fd;
   319         mt.max_idle = config->max_idle_threads;
   320         mt.main.thread_id = pthread_self();
   321         mt.main.prev = mt.main.next = &mt.main;
   322         sem_init(&mt.finish, 0, 0);
   323         pthread_mutex_init(&mt.lock, NULL);
   325         pthread_mutex_lock(&mt.lock);
   326         err = fuse_loop_start_thread(&mt);
   327         pthread_mutex_unlock(&mt.lock);
   331                         sem_wait(&mt.finish);
   333                 pthread_mutex_lock(&mt.lock);
   334                 for (w = mt.main.next; w != &mt.main; w = w->next)
   335                         pthread_cancel(w->thread_id);
   337                 pthread_mutex_unlock(&mt.lock);
   339                 while (mt.main.next != &mt.main)
   340                         fuse_join_worker(&mt, mt.main.next);
   345         pthread_mutex_destroy(&mt.lock);
   346         sem_destroy(&mt.finish);
   353 int fuse_session_loop_mt_31(
struct fuse_session *se, 
int clone_fd);
   354 FUSE_SYMVER(
"fuse_session_loop_mt_31", 
"fuse_session_loop_mt@FUSE_3.0")
   355 int fuse_session_loop_mt_31(struct fuse_session *se, 
int clone_fd)
   359         config.max_idle_threads = 10;
   360         return fuse_session_loop_mt_32(se, &config);
 
void fuse_session_exit(struct fuse_session *se)
int fuse_session_exited(struct fuse_session *se)
void fuse_session_reset(struct fuse_session *se)
void fuse_log(enum fuse_log_level level, const char *fmt,...)