From 16d74144026b92f5d3f4b229730ed364f4729545 Mon Sep 17 00:00:00 2001 From: "Michael I. Bushnell" Date: Thu, 3 Feb 1994 20:09:05 +0000 Subject: Initial revision --- libdiskfs/io-map-cntl.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 libdiskfs/io-map-cntl.c (limited to 'libdiskfs/io-map-cntl.c') diff --git a/libdiskfs/io-map-cntl.c b/libdiskfs/io-map-cntl.c new file mode 100644 index 00000000..5c3aadd9 --- /dev/null +++ b/libdiskfs/io-map-cntl.c @@ -0,0 +1,48 @@ +/* + Copyright (C) 1994 Free Software Foundation + + This program 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. + + This program 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 "priv.h" + +/* Implement io_map_cntl as described in . */ +error_t +S_io_map_cntl (struct protid *cred, + memory_object_t *ctlobj) +{ + if (!cred) + return EOPNOTSUPP; + + assert (__vm_page_size >= sizeof (struct shared_io)); + mutex_lock (&cred->po->np->lock); + if (!cred->mapped) + { + default_pager_object_create (default_pager, &cred->shared_object, + __vm_page_size); + vm_map (mach_task_self (), (u_int *)&cred->mapped, __vm_page_size, 0, 1, + cred->shared_object, 0, 0, VM_PROT_READ|VM_PROT_WRITE, + VM_PROT_READ|VM_PROT_WRITE, 0); + cred->mapped->conch_status = USER_HAS_NOT_CONCH; + spin_lock_init (&cred->mapped->lock); + *ctlobj = cred->shared_object; + mutex_unlock (&cred->po->np->lock); + return 0; + } + else + { + mutex_unlock (&cred->po->np->lock); + return EBUSY; + } +} -- cgit v1.2.3