// Return the amount of time to wait between sched_run_callbacks() calls
static struct timeval fuse_serve_timeout(void)
{
struct timeval tv = { .tv_sec = 0, .tv_usec = 1000000/HZ };
return tv;
}
struct callback_list {
unlock_callback_t callback;
void * data;
int count;
struct callback_list * next;
};
static struct callback_list * callbacks;
int fstitchd_unlock_callback(unlock_callback_t callback, void * data)
{
if(callbacks && callbacks->callback == callback && callbacks->data == data)
callbacks->count++;
else
{
struct callback_list * list = malloc(sizeof(*list));
if(!list)
return -ENOMEM;
list->callback = callback;
list->data = data;
list->count = 1;
list->next = callbacks;
callbacks = list;
}
return 0;
}
// Adapted from FUSE's lib/fuse_loop.c to support sched callbacks and multiple mounts
int fuse_serve_loop(void)
{
struct timeval tv;
mount_t ** mp;
int r;
Dprintf("%s()\n", __FUNCTION__);
if (!root_cfs)
{
fprintf(stderr, "%s(): no root cfs was specified; not running.\n", __FUNCTION__);
return -1;
}
if ((r = fuse_serve_mount_load_mounts()) < 0)
{
fprintf(stderr, "%s(): fuse_serve_load_mounts: %d\n", __FUNCTION__, r);
return r;
}
serving = 1;
tv = fuse_serve_timeout();
while ((mp = fuse_serve_mounts()) && mp && mp[0])
{
fd_set rfds;
int max_fd = 0;
struct timeval it_start, it_end;
FD_ZERO(&rfds);
if (shutdown_pipe[0] != -1)
{
FD_SET(shutdown_pipe[0], &rfds);
if (shutdown_pipe[0] > max_fd)
max_fd = shutdown_pipe[0];
}
FD_SET(remove_activity, &rfds);
if (remove_activity > max_fd)
max_fd = remove_activity;
for (mp = fuse_serve_mounts(); mp && *mp; mp++)
{
if ((*mp)->mounted && !fuse_session_exited((*mp)->session))
{
//printf("[\"%s\"]", mount->fstitch_path); fflush(stdout); // debug
int mount_fd = fuse_chan_fd((*mp)->channel);
FD_SET(mount_fd, &rfds);
if (mount_fd > max_fd)
max_fd = mount_fd;
}
}
r = select(max_fd+1, &rfds, NULL, NULL, &tv);
if (r == 0)
{
//printf("."); fflush(stdout); // debugging output
sched_run_callbacks();
tv = fuse_serve_timeout();
}
else if (r < 0)
{
if (errno != EINTR)
perror("select");
//printf("!\n"); fflush(stdout); // debugging output
tv = fuse_serve_timeout(); // tv may have become undefined
}
else
{
if (gettimeofday(&it_start, NULL) == -1)
{
perror("gettimeofday");
break;
}
for (mp = fuse_serve_mounts(); mp && *mp; mp++)
{
if ((*mp)->mounted && FD_ISSET((*mp)->channel_fd, &rfds))
{
r = fuse_chan_receive((*mp)->channel, channel_buf, channel_buf_len);
if(r <= 0)
fprintf(stderr, "fuse_chan_receive() returned %d, ignoring!\n", r);
//assert(r > 0); // this happens during shutdown on MacFUSE...
Dprintf("fuse_serve: request for mount \"%s\"\n", (*mp)->fstitch_path);
fuse_session_process((*mp)->session, channel_buf, r, (*mp)->channel);
sched_run_cleanup();
}
}
if (shutdown_pipe[0] != -1 && FD_ISSET(shutdown_pipe[0], &rfds))
{
// Start unmounting all filesystems
// Looping will stop once all filesystems are unmounted
ignore_shutdown_signals();
if (fuse_serve_mount_start_shutdown() < 0)
{
fprintf(stderr, "fuse_serve_mount_start_shutdown() failed, exiting fuse_serve_loop()\n");
return -1;
}
}
if (FD_ISSET(remove_activity, &rfds))
{
if (fuse_serve_mount_step_remove() < 0)
{
fprintf(stderr, "fuse_serve_mount_step_remove() failed, exiting fuse_serve_loop()\n");
return -1;
}
}
if (gettimeofday(&it_end, NULL) == -1)
{
perror("gettimeofday");
break;
}
tv = time_subtract(tv, time_elapsed(it_start, it_end));
}
while(callbacks)
{
struct callback_list * first = callbacks;
callbacks = first->next;
first->callback(first->data, first->count);
free(first);
}
}
serving = 0;
return 0;
}
/**
* Init of the pseudo fuse thread
@param ch : initial channel
@param se : initial session
@param rozofs_fuse_buffer_count : number of request buffers (corresponds to the number of fuse save context)
@retval 0 on success
@retval -1 on error
*/
int rozofs_fuse_init(struct fuse_chan *ch,struct fuse_session *se,int rozofs_fuse_buffer_count)
{
int status = 0;
int i;
// return 0;
fuse_sharemem_init_done = 0;
int fileflags;
rozofs_fuse_ctx_p = malloc(sizeof (rozofs_fuse_ctx_t));
if (rozofs_fuse_ctx_p == NULL)
{
/*
** cannot allocate memory for fuse rozofs context
*/
return -1;
}
memset(rozofs_fuse_ctx_p,0,sizeof (rozofs_fuse_ctx_t));
/*
** clear read/write merge stats table
*/
memset(rozofs_write_merge_stats_tab,0,sizeof(uint64_t)*RZ_FUSE_WRITE_MAX);
memset (rozofs_write_buf_section_table,0,sizeof(uint64_t)*ROZOFS_FUSE_NB_OF_BUSIZE_SECTION_MAX);
memset (rozofs_read_buf_section_table,0,sizeof(uint64_t)*ROZOFS_FUSE_NB_OF_BUSIZE_SECTION_MAX);
memset(&rozofs_fuse_read_write_stats_buf,0,sizeof(rozofs_fuse_read_write_stats));
/*
** init of the context
*/
rozofs_fuse_ctx_p->fuseReqPoolRef = NULL;
rozofs_fuse_ctx_p->ch = NULL;
rozofs_fuse_ctx_p->se = se;
rozofs_fuse_ctx_p->bufsize = 0;
rozofs_fuse_ctx_p->buf_fuse_req_p = NULL;
rozofs_fuse_ctx_p->dir_attr_invalidate = 0;
rozofs_fuse_ctx_p->initBufCount = rozofs_fuse_buffer_count;
while (1)
{
/*
** get the receive buffer size for former channel in order to create the request distributor:
** note: by default the fuse buffer is 4K+128K: for RozoFS the payload can reach 512K (x4)
*/
int bufsize = fuse_chan_bufsize(ch)*4;
rozofs_fuse_ctx_p->bufsize = bufsize;
/*
** create the distributor fro receiving data from fuse kernel
*/
status = rozofs_fuse_init_rcv_buffer_pool(ROZOFS_FUSE_RECV_BUF_COUNT,bufsize);
if (status < 0)
{
severe( "rozofs_fuse_init fuse buffer pool creation error(%d,%d)", (int)ROZOFS_FUSE_RECV_BUF_COUNT, (int)bufsize ) ;
status = -1;
break;
}
/*
** create the pool
*/
rozofs_fuse_ctx_p->fuseReqPoolRef = ruc_buf_poolCreate(rozofs_fuse_buffer_count,sizeof(rozofs_fuse_save_ctx_t));
if (rozofs_fuse_ctx_p->fuseReqPoolRef == NULL)
{
severe( "rozofs_fuse_init buffer pool creation error(%d,%d)", (int)rozofs_fuse_buffer_count, (int)sizeof(rozofs_fuse_save_ctx_t) ) ;
status = -1;
break;
}
ruc_buffer_debug_register_pool("fuseCtx", rozofs_fuse_ctx_p->fuseReqPoolRef);
/*
** Allocate a head of list for queueing pending lookup requests
*/
for (i=0; i< ROZOFS_MAX_LKUP_QUEUE ; i++)
{
ruc_listHdrInit(&rozofs_lookup_queue[i]);
}
/*
** allocate a buffer for receiving the fuse request
*/
rozofs_fuse_ctx_p->buf_fuse_req_p = malloc(bufsize);
if (rozofs_fuse_ctx_p == NULL)
{
severe( "rozofs_fuse_init out of memory %d", bufsize ) ;
status = -1;
break;
}
/*
** get the fd of the channel
*/
rozofs_fuse_ctx_p->fd = fuse_chan_fd(ch);
/*
** wait the end of the share memroy init prior providing it to fuse
*/
while (rozofs_shared_mem_init_done == 0) sleep(1);
/*
** create a new channel with the specific operation for rozofs (non-blocking)
*/
rozofs_fuse_ctx_p->ch = fuse_chan_new(&rozofs_fuse_ch_ops,fuse_chan_fd(ch),bufsize,rozofs_fuse_ctx_p);
if (rozofs_fuse_ctx_p->ch == NULL)
{
severe( "rozofs_fuse_init fuse_chan_new error" ) ;
status = -1;
break;
}
/*
** remove the association between the initial session and channel
*/
fuse_session_remove_chan(ch);
/*
** OK, now add the new channel
*/
fuse_session_add_chan(se,rozofs_fuse_ctx_p->ch );
/*
** set the channel in non blocking mode
*/
if((fileflags=fcntl(rozofs_fuse_ctx_p->fd,F_GETFL,0))==-1)
{
RUC_WARNING(errno);
status = -1;
break;
}
if((fcntl(rozofs_fuse_ctx_p->fd,F_SETFL,fileflags|O_NDELAY))==-1)
{
RUC_WARNING(errno);
status = -1;
break;
}
/*
** send XON to the fuse channel
*/
{
int ret;
rozofs_fuse_ctx_p->ioctl_supported = 1;
rozofs_fuse_ctx_p->data_xon = 1;
while(1)
{
ret = ioctl(rozofs_fuse_ctx_p->fd,1,NULL);
if (ret < 0)
{
warning("ioctl error %s",strerror(errno));
rozofs_fuse_ctx_p->ioctl_supported = 0;
break;
}
if (rozofs_fuse_ctx_p->dir_attr_invalidate == 0)
{
ret = ioctl(rozofs_fuse_ctx_p->fd,3,NULL);
if (ret < 0)
{
warning("ioctl error %s",strerror(errno));
// rozofs_fuse_ctx_p->ioctl_supported = 0;
rozofs_fuse_ctx_p->dir_attr_invalidate = 1;
break;
}
}
break;
}
}
/*
** perform the connection with the socket controller
*/
/*
** OK, we are almost done, just need to connect with the socket controller
*/
rozofs_fuse_ctx_p->connectionId = ruc_sockctl_connect(rozofs_fuse_ctx_p->fd, // Reference of the socket
"rozofs_fuse", // name of the socket
3, // Priority within the socket controller
(void*)rozofs_fuse_ctx_p, // user param for socketcontroller callback
&rozofs_fuse_callBack_sock); // Default callbacks
if (rozofs_fuse_ctx_p->connectionId == NULL)
{
/*
** Fail to connect with the socket controller
*/
RUC_WARNING(-1);
status = -1;
break;
}
rozofs_fuse_get_ticker();
status = 0;
break;
}
/*
** attach the callback on socket controller
*/
//#warning no poller
ruc_sockCtrl_attach_applicative_poller(rozofs_fuse_scheduler_entry_point);
for(i = 0; i < 3;i++) fuse_profile[i] = 0;
uma_dbg_addTopic("fuse", rozofs_fuse_show);
return status;
}
static void fuse_unmount_common(const char *mountpoint, struct fuse_chan *ch)
{
int fd = ch ? fuse_chan_fd(ch) : -1;
fuse_kern_unmount(mountpoint, fd);
fuse_chan_destroy(ch);
}