From 88832f95a8473f326890eb2cf1c700c8f8e0e044 Mon Sep 17 00:00:00 2001 From: Miles Bader Date: Fri, 13 Oct 1995 23:15:42 +0000 Subject: Initial revision --- libdiskfs/dev-open.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 libdiskfs/dev-open.c (limited to 'libdiskfs/dev-open.c') diff --git a/libdiskfs/dev-open.c b/libdiskfs/dev-open.c new file mode 100644 index 00000000..5b45c30e --- /dev/null +++ b/libdiskfs/dev-open.c @@ -0,0 +1,66 @@ +/* Standard device opening + + Copyright (C) 1995 Free Software Foundation, Inc. + + Written by Miles Bader + + 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 + +/* Uses the values of DISKFS_DEVICE_ARG and DISKFS_USE_MACH_DEVICE, and + attempts to open the device and set the values of DISKFS_DEVICE, + DISKFS_DEVICE_NAME, DISKFS_DEVICE_START, DISKFS_DEVICE_SIZE, and + DISKFS_DEVICE_BLOCK_SIZE. */ +error_t +diskfs_device_open () +{ + error_t err; + if (diskfs_use_mach_device) + { + diskfs_device_name = diskfs_device_arg; + err = + diskfs_get_mach_device (diskfs_device_name, &diskfs_device, + &diskfs_device_start, &diskfs_device_size, + &diskfs_device_block_size); + } + else + err = + diskfs_get_file_device (diskfs_device_arg, + &diskfs_device_name, &diskfs_device, + &diskfs_device_start, &diskfs_device_size, + &diskfs_device_block_size); + + if (! err) + { + diskfs_log2_device_block_size = 0; + while ((1 << diskfs_log2_device_block_size) < diskfs_device_block_size) + diskfs_log2_device_block_size++; + while ((1 << diskfs_log2_device_block_size) != diskfs_device_block_size) + diskfs_log2_device_block_size = 0; + + diskfs_log2_device_blocks_per_page = 0; + while ((diskfs_device_block_size << diskfs_log2_device_blocks_per_page) + < vm_page_size) + diskfs_log2_device_blocks_per_page++; + if ((diskfs_device_block_size << diskfs_log2_device_blocks_per_page) + != vm_page_size) + diskfs_log2_device_blocks_per_page = 0; + } + + return err; +} -- cgit v1.2.3