diff options
Diffstat (limited to 'libtreefs/trans-help.c')
| -rw-r--r-- | libtreefs/trans-help.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/libtreefs/trans-help.c b/libtreefs/trans-help.c deleted file mode 100644 index 7d3841c0..00000000 --- a/libtreefs/trans-help.c +++ /dev/null @@ -1,129 +0,0 @@ -/* Helper routines for dealing with translators - - Copyright (C) 1995 Free Software Foundation, Inc. - - Written by Miles Bader <miles@gnu.ai.mit.edu> - - This file is part of the GNU Hurd. - - The GNU Hurd is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - The GNU Hurd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -#include "trivfs.h" - -/* 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); - } - - pthread_mutex_lock (&node->active_trans.lock); - - if (node->active_trans.control != MACH_PORT_NULL) - { - mach_port_t control = node->active_trans.control; - mach_port_mod_refs (mach_task_self (), control, - MACH_PORT_RIGHT_SEND, 1); - pthread_mutex_unlock (&node->active_trans.lock); - - /* Now we have a copy of the translator port that isn't - dependent on the translator lock itself. Relock - the directory, make a port from it, and then call - fsys_getroot. */ - - if (*dir_port == MACH_PORT_NULL) - make_dir_port (); - - *control_port = control; - - return 0; - } - - pthread_mutex_unlock (&node->active_trans.lock); - - /* If we get here, then we have no active control port. - Check to see if there is a passive translator, and if so - repeat the translator check. */ - pthread_mutex_lock (&node->lock); - if (!node->istranslated) - { - *control_port = MACH_PORT_NULL; - return 0; - } - - err = treefs_node_get_translator (node, trans, &trans_len); - if (err == E2BIG) - { - trans = alloca (trans_len); - err = treefs_node_get_translator (node, trans, &trans_len); - } - if (err) - { - pthread_mutex_unlock (&node->lock); - return err; - } - - if (*dir_port == MACH_PORT_NULL) - { - pthread_mutex_unlock (&node->lock); - make_dir_port (); - pthread_mutex_lock (&node->lock); - } - - /* Try starting the translator (this unlocks NODE). */ - err = treefs_start_translator (node, trans, trans_len, *dir_port); - if (err) - return err; - - /* Try again now that we've started the translator... This call - should be tail recursive. */ - return - treefs_node_get_active_trans (node, dir, parent_port, - control_port, dir_port); -} - -/* Drop the active translator CONTROL_PORT on NODE, unless it's no longer the - current active translator, in which case just drop a reference to it. */ -void -treefs_node_drop_active_trans (struct treefs_node *node, - mach_port_t control_port) -{ - pthread_mutex_lock (&node->active_trans.lock); - /* Only zero the control port if it hasn't changed. */ - if (node->active_trans.control == control) - fshelp_translator_drop (&node->active_trans); - pthread_mutex_unlock (&node->active_trans.lock); - - /* And we're done with this port. */ - mach_port_deallocate (mach_task_self (), control_port); -} |