/* 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;
}
error_t
_treefs_s_fsys_getroot (struct treefs_fsys *fsys,
mach_port_t dotdot,
uid_t *uids, unsigned nuids,
uid_t *gids, unsigned ngids,
int flags, retry_type *retry, char *retry_name,
file_t *result, mach_msg_type_name_t *result_type)
{
error_t err;
mode_t type;
struct treefs_node *root;
struct treefs_auth *auth;
flags &= O_HURD;
err = treefs_fsys_get_root (fsys, &root);
if (err)
return err;
if (!(flags & O_NOTRANS))
/* Try starting up any translator on the root node. */
{
fsys_t child_fsys;
do
{
err =
treefs_node_get_active_trans (root, 0, 0, &dotdot, &child_fsys);
if (err == 0 && child_fsys != MACH_PORT_NULL)
/* We think there's an active translator; try contacting it. */
{
err =
fsys_getroot (child_fsys, dotdot, MACH_MSG_TYPE_COPY_SEND,
uids, nuids, gids, ngids,
flags, retry, retry_name, result);
/* If we got MACH_SEND_INVALID_DEST or MIG_SERVER_DIED, then
the server is dead. Zero out the old control port and try
everything again. */
if (err == MACH_SEND_INVALID_DEST || err == EMIG_SERVER_DIED)
treefs_node_drop_active_trans (root, control_port);
}
}
while (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED);
/* If we got a translator, or an error trying, return immediately. */
if (err || child_fsys)
{
if (!err && *result != MACH_PORT_NULL)
*result_type = MACH_MSG_TYPE_MOVE_SEND;
else
*result_type = MACH_MSG_TYPE_COPY_SEND;
if (!err)
mach_port_deallocate (mach_task_self (), dotdot);
treefs_node_unref (root);
return err;
}
}
pthread_mutex_lock (&root->lock);
type = treefs_node_type (root);
if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
/* Handle symlink interpretation */
{
int sym_len = 1000;
char path_buf[sym_len + 1], *path = path_buf;
err = treefs_node_get_symlink (root, path, &sym_len);
if (err == E2BIG)
/* Symlink contents won't fit in our buffer, so
reallocate it and try again. */
{
path = alloca (sym_len + 1);
err = treefs_node_get_symlink (node, path, &sym_len);
}
if (err)
goto out;
if (*path == '/')
{
*retry = FS_RETRY_MAGICAL;
*result = MACH_PORT_NULL;
*result_type = MACH_MSG_TYPE_COPY_SEND;
mach_port_deallocate (mach_task_self (), dotdot);
}
else
{
*retry = FS_RETRY_REAUTH;
*result = dotdot;
*result_type = MACH_MSG_TYPE_COPY_SEND;
}
strcpy (retry_name, path);
goto out;
}
err = treefs_node_create_auth (root, uids, nuids, gids, ngids, &auth);
if (err)
goto out;
*retry = FS_RETRY_NORMAL;
*retry_name = '\0';
*result_type = MACH_MSG_TYPE_MAKE_SEND;
err = treefs_node_create_right (root, dotdot, flags, auth, result);
treefs_node_auth_unref (root, auth);
out:
treefs_node_release (root);
return err;
}
