From bd1306f7f3c4441bbb057b031f251e2f31317d79 Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Wed, 8 Sep 1999 08:42:56 +0000 Subject: 1999-09-07 Thomas Bushnell, BSG * io-map-segment.c: New file. Guts from io-map.c. * io-map.c (diskfs_S_io_map): Just call diskfs_S_io_map_segment. * diskfs.h (diskfs_get_filemap): New parameter `index'. * rdwr-internal.c (_diskfs_rdwr_internal): Pass additional parameter to diskfs_get_filemap. * Makefile (IOSRCS): Add io-map-segment.c. --- libdiskfs/io-map-segment.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 libdiskfs/io-map-segment.c (limited to 'libdiskfs/io-map-segment.c') diff --git a/libdiskfs/io-map-segment.c b/libdiskfs/io-map-segment.c new file mode 100644 index 00000000..4245602d --- /dev/null +++ b/libdiskfs/io-map-segment.c @@ -0,0 +1,78 @@ +/* + Copyright (C) 1999 Free Software Foundation, Inc. + Written by Thomas Bushnell, BSG. + + 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include + +#include "priv.h" +#include "io_S.h" + +/* Implement io_map as described in . */ +kern_return_t +diskfs_S_io_map_segment (struct protid *cred, + int index, + memory_object_t *rdobj, + mach_msg_type_name_t *rdtype, + memory_object_t *wrobj, + mach_msg_type_name_t *wrtype) +{ + int flags; + struct node *node; + + if (!cred) + return EOPNOTSUPP; + + *wrobj = *rdobj = MACH_PORT_NULL; + + node = cred->po->np; + flags = cred->po->openstat & (O_READ | O_WRITE); + + mutex_lock (&node->lock); + switch (flags) + { + case O_READ | O_WRITE: + *wrobj = *rdobj = diskfs_get_filemap (node, index, + VM_PROT_READ |VM_PROT_WRITE); + if (*wrobj == MACH_PORT_NULL) + goto error; + mach_port_mod_refs (mach_task_self (), *rdobj, MACH_PORT_RIGHT_SEND, 1); + break; + case O_READ: + *rdobj = diskfs_get_filemap (node, index, VM_PROT_READ); + if (*rdobj == MACH_PORT_NULL) + goto error; + break; + case O_WRITE: + *wrobj = diskfs_get_filemap (node, index, VM_PROT_WRITE); + if (*wrobj == MACH_PORT_NULL) + goto error; + break; + } + mutex_unlock (&node->lock); + + *rdtype = MACH_MSG_TYPE_MOVE_SEND; + *wrtype = MACH_MSG_TYPE_MOVE_SEND; + + return 0; + +error: + mutex_unlock (&node->lock); + return errno; +} + -- cgit v1.2.3