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/* Main entry point for the ext2 file system translator
Copyright (C) 1994, 1995 Free Software Foundation, Inc.
Converted for ext2fs by Miles Bader <miles@gnu.ai.mit.edu>
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 <stdarg.h>
#include <stdio.h>
#include <device/device.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "ext2fs.h"
#include "error.h"
/* ---------------------------------------------------------------- */
int diskfs_link_max = EXT2_LINK_MAX;
int diskfs_maxsymlinks = 8;
int diskfs_shortcut_symlink = 1;
int diskfs_shortcut_chrdev = 1;
int diskfs_shortcut_blkdev = 1;
int diskfs_shortcut_fifo = 1;
int diskfs_shortcut_ifsock = 1;
char *diskfs_server_name = "ext2fs";
int diskfs_major_version = 0;
int diskfs_minor_version = 0;
int diskfs_edit_version = 0;
int diskfs_synchronous = 0;
int diskfs_readonly = 0;
/* ---------------------------------------------------------------- */
struct node *diskfs_root_node;
/* Set diskfs_root_node to the root inode. */
static void
warp_root (void)
{
error_t err;
err = iget (EXT2_ROOT_INO, &diskfs_root_node);
assert (!err);
mutex_unlock (&diskfs_root_node->lock);
}
/* ---------------------------------------------------------------- */
void
main (int argc, char **argv)
{
error_t err;
mach_port_t bootstrap = MACH_PORT_NULL;
argp_parse (diskfs_device_startup_argp, argc, argv, 0, 0);
diskfs_console_stdio ();
if (! diskfs_boot_flags)
{
task_get_bootstrap_port (mach_task_self (), &bootstrap);
if (bootstrap == MACH_PORT_NULL)
error (2, 0, "Must be started as a translator");
}
/* Initialize the diskfs library. This must come before
any other diskfs call. */
diskfs_init_diskfs ();
err = diskfs_device_open ();
if (err)
error (3, err, "%s", diskfs_device_arg);
if ((diskfs_device_size << diskfs_log2_device_block_size)
< SBLOCK_OFFS + SBLOCK_SIZE)
ext2_panic ("superblock won't fit on the device!");
if (diskfs_log2_device_block_size == 0)
ext2_panic ("device block size (%u) not a power of two",
diskfs_device_block_size);
if (diskfs_log2_device_blocks_per_page < 0)
ext2_panic ("device block size (%u) greater than page size (%d)",
diskfs_device_block_size, vm_page_size);
/* Map the entire disk. */
create_disk_pager ();
/* Start the first request thread, to handle RPCs and page requests. */
diskfs_spawn_first_thread ();
err = vm_map (mach_task_self (), (vm_address_t *)&disk_image,
diskfs_device_size << diskfs_log2_device_block_size,
0, 1, disk_pager_port, 0, 0,
VM_PROT_READ | (diskfs_readonly ? 0 : VM_PROT_WRITE),
VM_PROT_READ | VM_PROT_WRITE,
VM_INHERIT_NONE);
if (err)
error (2, err, "vm_map");
diskfs_register_memory_fault_area (disk_pager, 0,
disk_image,
diskfs_device_size << diskfs_log2_device_block_size);
pokel_init (&global_pokel, disk_pager, disk_image);
err = get_hypermetadata();
if (err)
error (3, err, "get_hypermetadata");
inode_init ();
/* Find our root node. */
warp_root ();
/* Now that we are all set up to handle requests, and diskfs_root_node is
set properly, it is safe to export our fsys control port to the
outside world. */
diskfs_startup_diskfs (bootstrap, 0);
/* and so we die, leaving others to do the real work. */
cthread_exit (0);
}
error_t
diskfs_reload_global_state ()
{
pokel_flush (&global_pokel);
pager_flush (disk_pager, 1);
get_hypermetadata ();
return 0;
}
/* ---------------------------------------------------------------- */
static spin_lock_t free_page_bufs_lock = SPIN_LOCK_INITIALIZER;
static vm_address_t free_page_bufs = 0;
/* Returns a single page page-aligned buffer. */
vm_address_t get_page_buf ()
{
vm_address_t buf;
spin_lock (&free_page_bufs_lock);
buf = free_page_bufs;
if (buf == 0)
{
spin_unlock (&free_page_bufs_lock);
vm_allocate (mach_task_self (), &buf, vm_page_size, 1);
}
else
{
free_page_bufs = *(vm_address_t *)buf;
spin_unlock (&free_page_bufs_lock);
}
return buf;
}
/* Frees a block returned by get_page_buf. */
void free_page_buf (vm_address_t buf)
{
spin_lock (&free_page_bufs_lock);
*(vm_address_t *)buf = free_page_bufs;
free_page_bufs = buf;
spin_unlock (&free_page_bufs_lock);
}
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