static void mt_session_exit(void *data, int val)
{
struct procdata *pd = (struct procdata *) data;
if (val)
fuse_session_exit(pd->prevse);
else
fuse_session_reset(pd->prevse);
}
/**
* internal function that is called from processing a message that
has been queued on the /dev/fuse socket. That function is
inherited from fuse_kern_chan_receive
@param chp : pointer to the channel
@param buf: pointer to the buffer where data will be copied
@param size : max size of the receive buffer
@retval > 0 : number of byte read
@retval = 0 : session has been exited
@retval < 0 : error
*/
int rozofs_fuse_kern_chan_receive(struct fuse_chan **chp, char *buf,
size_t size)
{
struct fuse_chan *ch = *chp;
int err;
ssize_t res;
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
restart:
res = read(fuse_chan_fd(ch), buf, size);
if (fuse_session_exited(se))
return 0;
if (res == -1)
{
/* ENOENT means the operation was interrupted, it's safe
to restart */
err = errno;
if (err == ENOENT)
{
rozofs_fuse_req_enoent_count++;
goto restart;
}
if (err == ENODEV) {
severe("Exit from RozofsMount required!!!");
fuse_session_exit(se);
rozofs_exit();
return 0;
}
/* Errors occurring during normal operation: EINTR (read
interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
umounted) */
if (err != EINTR && err != EAGAIN) severe("fuse: reading device");
if ((err == EAGAIN)|| (err == EINTR)) rozofs_fuse_req_eagain_count++;
return -err;
}
#if 0
if ((size_t) res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short read on fuse device\n");
return -EIO;
}
#endif
rozofs_fuse_req_count++;
rozofs_fuse_req_byte_in+=res;
return res;
}
static int fuse_kern_chan_receive(struct fuse_chan **chp, char *buf,
size_t size)
{
struct fuse_chan *ch = *chp;
int err;
ssize_t res;
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
restart:
res = read(fuse_chan_fd(ch), buf, size);
err = errno;
if (fuse_session_exited(se))
return 0;
if (res == -1) {
/* ENOENT means the operation was interrupted, it's safe
to restart */
if (err == ENOENT)
goto restart;
if (err == ENODEV) {
fuse_session_exit(se);
return 0;
}
/* Errors occurring during normal operation: EINTR (read
interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
umounted) */
if (err != EINTR && err != EAGAIN)
perror("fuse: reading device");
return -err;
}
if ((size_t) res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short read on fuse device\n");
return -EIO;
}
return res;
}
static void exit_handler(int sig)
{
(void) sig;
if (fuse_instance)
fuse_session_exit(fuse_instance);
}
static void *fuse_do_work(void *data)
{
struct fuse_worker *w = (struct fuse_worker *) data;
struct fuse_mt *mt = w->mt;
while (!fuse_session_exited(mt->se)) {
int isforget = 0;
struct fuse_chan *ch = mt->prevch;
struct fuse_buf fbuf = {
.mem = w->buf,
.size = w->bufsize,
};
int res;
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
res = fuse_session_receive_buf(mt->se, &fbuf, &ch);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (res == -EINTR)
continue;
if (res <= 0) {
if (res < 0) {
fuse_session_exit(mt->se);
mt->error = -1;
}
break;
}
pthread_mutex_lock(&mt->lock);
if (mt->exit) {
pthread_mutex_unlock(&mt->lock);
return NULL;
}
/*
* This disgusting hack is needed so that zillions of threads
* are not created on a burst of FORGET messages
*/
if (!(fbuf.flags & FUSE_BUF_IS_FD)) {
struct fuse_in_header *in = fbuf.mem;
if (in->opcode == FUSE_FORGET ||
in->opcode == FUSE_BATCH_FORGET)
isforget = 1;
}
if (!isforget)
mt->numavail--;
if (mt->numavail == 0)
fuse_loop_start_thread(mt);
pthread_mutex_unlock(&mt->lock);
fuse_session_process_buf(mt->se, &fbuf, ch);
pthread_mutex_lock(&mt->lock);
if (!isforget)
mt->numavail++;
if (mt->numavail > 10) {
if (mt->exit) {
pthread_mutex_unlock(&mt->lock);
return NULL;
}
list_del_worker(w);
mt->numavail--;
mt->numworker--;
pthread_mutex_unlock(&mt->lock);
pthread_detach(w->thread_id);
free(w->buf);
free(w);
return NULL;
}
pthread_mutex_unlock(&mt->lock);
}
sem_post(&mt->finish);
return NULL;
}
int fuse_start_thread(pthread_t *thread_id, void *(*func)(void *), void *arg)
{
sigset_t oldset;
sigset_t newset;
int res;
pthread_attr_t attr;
char *stack_size;
/* Override default stack size */
pthread_attr_init(&attr);
stack_size = getenv(ENVNAME_THREAD_STACK);
if (stack_size && pthread_attr_setstacksize(&attr, atoi(stack_size)))
fprintf(stderr, "fuse: invalid stack size: %s\n", stack_size);
/* Disallow signal reception in worker threads */
sigemptyset(&newset);
sigaddset(&newset, SIGTERM);
sigaddset(&newset, SIGINT);
sigaddset(&newset, SIGHUP);
sigaddset(&newset, SIGQUIT);
pthread_sigmask(SIG_BLOCK, &newset, &oldset);
res = pthread_create(thread_id, &attr, func, arg);
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
pthread_attr_destroy(&attr);
if (res != 0) {
fprintf(stderr, "fuse: error creating thread: %s\n",
strerror(res));
return -1;
}
return 0;
}
static void *fuse_do_work(void *data)
{
struct fuse_worker *w = (struct fuse_worker *) data;
struct fuse_mt *mt = w->mt;
while (!fuse_session_exited(mt->se)) {
int isforget = 0;
struct fuse_chan *ch = mt->prevch;
int res;
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
res = fuse_chan_recv(&ch, w->buf, w->bufsize);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (res == -EINTR)
continue;
if (res <= 0) {
if (res < 0) {
fuse_session_exit(mt->se);
mt->error = -1;
}
break;
}
pthread_mutex_lock(&mt->lock);
if (mt->exit) {
pthread_mutex_unlock(&mt->lock);
return NULL;
}
/*
* This disgusting hack is needed so that zillions of threads
* are not created on a burst of FORGET messages
*/
if (((struct fuse_in_header *) w->buf)->opcode == FUSE_FORGET)
isforget = 1;
if (!isforget)
mt->numavail--;
if (mt->numavail == 0)
fuse_start_thread(mt);
pthread_mutex_unlock(&mt->lock);
fuse_session_process(mt->se, w->buf, res, ch);
pthread_mutex_lock(&mt->lock);
if (!isforget)
mt->numavail++;
if (mt->numavail > 10) {
if (mt->exit) {
pthread_mutex_unlock(&mt->lock);
return NULL;
}
list_del_worker(w);
mt->numavail--;
mt->numworker--;
pthread_mutex_unlock(&mt->lock);
pthread_detach(w->thread_id);
free(w->buf);
free(w);
return NULL;
}
pthread_mutex_unlock(&mt->lock);
}
sem_post(&mt->finish);
#ifdef __APPLE__
{
sigset_t set;
(void) sigprocmask(0, NULL, &set);
(void) sigsuspend(&set); /* want cancelable */
}
#else /* !__APPLE__ */
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pause();
#endif /* __APPLE__ */
return NULL;
}