/* Return the active translator control port for NODE. If there is no
translator, active or passive, MACH_PORT_NULL is returned in CONTROL_PORT.
If there is a translator, it is started if necessary, and returned in
CONTROL_PORT. *DIR_PORT should be a port right to use as the new
translators parent directory. If it is MACH_PORT_NULL, a port is created
from DIR and PARENT_PORT and stored in *DIR_PORT; otherwise DIR and
PARENT_PORT are not used. Neither NODE or DIR should be locked when
calling this function. */
error_t
treefs_node_get_active_trans (struct treefs_node *node,
struct treefs_node *dir,
mach_port_t parent_port,
mach_port_t *control_port,
mach_port_t *dir_port)
{
/* Fill in dir_port */
void make_dir_port ()
{
pthread_mutex_lock (&dir->lock);
*dir_port = treefs_node_make_right (dir, 0, parent_port, 0);
mach_port_insert_right (mach_task_self (),
*dir_port, *dir_port, MACH_MSG_TYPE_MAKE_SEND);
pthread_mutex_unlock (&dir->lock);
}
/* Start the translator TRANS (of length TRANS_LEN) on NODE, which should be
locked, and will be unlocked when this function returns. PARENT_PORT is
a send right to use as the parent port passed to the translator. */
error_t
_treefs_node_start_translator (struct treefs_node *node,
char *trans, unsigned trans_len,
file_t parent_port)
{
error_t err;
int mode = O_READ | O_EXEC;
struct treefs_auth *auth;
file_t node_port;
uid_t uid, gid;
err = treefs_node_get_trans_auth (node, &auth);
if (err)
return err;
if (!node->fsys->readonly && treefs_node_type (node) == S_IFREG)
mode |= O_WRITE;
/* Create the REALNODE port for the new filesystem. */
node_port = treefs_node_make_right (node, mode, parent_port, auth);
mach_port_insert_right (mach_task_self (), node_port, node_port,
MACH_MSG_TYPE_MAKE_SEND);
mutex_unlock (&node->lock);
/* XXXX Change libfshelp so that it take more than 1 uid/gid? */
uid = auth->nuids > 0 ? auth->uids[0] : -1;
gid = auth->ngids > 0 ? auth->gids[0] : -1;
/* XXX this should use fshelp_start_translator_long. */
err =
fshelp_start_translator (&node->active_trans, NULL, trans, trans_len,
parent_port, node_port, uid, gid);
treefs_node_auth_unref (node, auth);
return err;
}
