/*===========================================================================*
* do_fs_reply *
*===========================================================================*/
static void *do_fs_reply(struct job *job)
{
struct vmnt *vmp;
struct fproc *rfp;
if ((vmp = find_vmnt(who_e)) == NULL)
panic("Couldn't find vmnt for endpoint %d", who_e);
rfp = job->j_fp;
if (rfp == NULL || rfp->fp_endpoint == NONE) {
printf("VFS: spurious reply from %d\n", who_e);
return(NULL);
}
if (rfp->fp_task != who_e)
printf("VFS: expected %d to reply, not %d\n", rfp->fp_task, who_e);
*rfp->fp_sendrec = m_in;
rfp->fp_task = NONE;
vmp->m_comm.c_cur_reqs--; /* We've got our reply, make room for others */
if (rfp->fp_wtid != invalid_thread_id)
worker_signal(worker_get(rfp->fp_wtid)); /* Continue this thread */
else
printf("VFS: consistency error: reply for finished job\n");
return(NULL);
}
/*===========================================================================*
* worker_self *
*===========================================================================*/
PUBLIC struct worker_thread *worker_self(void)
{
struct worker_thread *worker;
worker = worker_get(mthread_self());
assert(worker != NULL);
return(worker);
}
/*===========================================================================*
* do_fs_reply *
*===========================================================================*/
static void *do_fs_reply(struct job *job)
{
struct vmnt *vmp;
struct worker_thread *wp;
if ((vmp = find_vmnt(who_e)) == NULL)
panic("Couldn't find vmnt for endpoint %d", who_e);
wp = worker_get(job->j_fp->fp_wtid);
if (wp == NULL) {
printf("VFS: spurious reply from %d\n", who_e);
return(NULL);
}
if (wp->w_task != who_e) {
printf("VFS: expected %d to reply, not %d\n", wp->w_task, who_e);
return(NULL);
}
*wp->w_fs_sendrec = m_in;
wp->w_task = NONE;
vmp->m_comm.c_cur_reqs--; /* We've got our reply, make room for others */
worker_signal(wp); /* Continue this thread */
return(NULL);
}
/*===========================================================================*
* worker_getjob *
*===========================================================================*/
PUBLIC struct job *worker_getjob(thread_t worker_tid)
{
struct worker_thread *worker;
if ((worker = worker_get(worker_tid)) != NULL)
return(&worker->w_job);
return(NULL);
}
/*===========================================================================*
* dmap_endpt_up *
*===========================================================================*/
void dmap_endpt_up(endpoint_t proc_e, int is_blk)
{
/* A device driver with endpoint proc_e has been restarted. Go tell everyone
* that might be blocking on it that this device is 'up'.
*/
devmajor_t major;
struct dmap *dp;
struct worker_thread *worker;
if (proc_e == NONE) return;
for (major = 0; major < NR_DEVICES; major++) {
if ((dp = get_dmap_by_major(major)) == NULL) continue;
if (dp->dmap_driver == proc_e) {
if (is_blk) {
if (dp->dmap_recovering) {
printf("VFS: driver recovery failure for"
" major %d\n", major);
if (dp->dmap_servicing != INVALID_THREAD) {
worker = worker_get(dp->dmap_servicing);
worker_stop(worker);
}
dp->dmap_recovering = 0;
continue;
}
dp->dmap_recovering = 1;
bdev_up(major);
dp->dmap_recovering = 0;
} else {
if (dp->dmap_servicing != INVALID_THREAD) {
worker = worker_get(dp->dmap_servicing);
worker_stop(worker);
}
invalidate_filp_by_char_major(major);
}
}
}
}
/*===========================================================================*
* main *
*===========================================================================*/
int main(void)
{
/* This is the main program of the file system. The main loop consists of
* three major activities: getting new work, processing the work, and sending
* the reply. This loop never terminates as long as the file system runs.
*/
int transid;
struct worker_thread *wp;
/* SEF local startup. */
sef_local_startup();
printf("Started VFS: %d worker thread(s)\n", NR_WTHREADS);
/* This is the main loop that gets work, processes it, and sends replies. */
while (TRUE) {
worker_yield(); /* let other threads run */
send_work();
/* The get_work() function returns TRUE if we have a new message to
* process. It returns FALSE if it spawned other thread activities.
*/
if (!get_work())
continue;
transid = TRNS_GET_ID(m_in.m_type);
if (IS_VFS_FS_TRANSID(transid)) {
wp = worker_get((thread_t) transid - VFS_TRANSID);
if (wp == NULL || wp->w_fp == NULL) {
printf("VFS: spurious message %d from endpoint %d\n",
m_in.m_type, m_in.m_source);
continue;
}
m_in.m_type = TRNS_DEL_ID(m_in.m_type);
do_reply(wp);
continue;
} else if (who_e == PM_PROC_NR) { /* Calls from PM */
/* Special control messages from PM */
service_pm();
continue;
} else if (is_notify(call_nr)) {
/* A task ipc_notify()ed us */
switch (who_e) {
case DS_PROC_NR:
/* Start a thread to handle DS events, if no thread
* is pending or active for it already. DS is not
* supposed to issue calls to VFS or be the subject of
* postponed PM requests, so this should be no problem.
*/
if (worker_can_start(fp))
handle_work(ds_event);
break;
case KERNEL:
mthread_stacktraces();
break;
case CLOCK:
/* Timer expired. Used only for select(). Check it. */
expire_timers(m_in.m_notify.timestamp);
break;
default:
printf("VFS: ignoring notification from %d\n", who_e);
}
continue;
} else if (who_p < 0) { /* i.e., message comes from a task */
/* We're going to ignore this message. Tasks should
* send ipc_notify()s only.
*/
printf("VFS: ignoring message from %d (%d)\n", who_e, call_nr);
continue;
}
if (IS_BDEV_RS(call_nr)) {
/* We've got results for a block device request. */
bdev_reply();
} else if (IS_CDEV_RS(call_nr)) {
/* We've got results for a character device request. */
cdev_reply();
} else {
/* Normal syscall. This spawns a new thread. */
handle_work(do_work);
}
}
return(OK); /* shouldn't come here */
}