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/* Filesystem management for NFS server
Copyright (C) 1996, 2002 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/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 <stdio.h>
#include <errno.h>
#include <error.h>
#include <hurd.h>
#include <fcntl.h>
#include <string.h>
#include "nfsd.h"
struct fsys_spec
{
fsys_t fsys;
char *name;
};
static struct fsys_spec *fsystable;
static int nfsys = 0;
static int fsystablesize = 0;
file_t index_file_dir;
char *index_file_compname;
/* Read the filesystem table in from disk */
void
init_filesystems (void)
{
int nitems;
char *name;
int index;
int line;
file_t root;
static FILE *index_file;
int i;
fsystable = (struct fsys_spec *) malloc ((fsystablesize = 10)
* sizeof (struct fsys_spec));
for (i = 0; i < fsystablesize; i++)
{
fsystable[i].fsys = MACH_PORT_NULL;
fsystable[i].name = 0;
}
if (!index_file_name)
return;
index_file = fopen (index_file_name, "r");
if (!index_file)
{
error (0, errno, "Cannot open `%s'", index_file_name);
return;
}
for (line = 1; ; line++)
{
nitems = fscanf (index_file, "%d %ms\n", &index, &name);
if (nitems == EOF)
{
fclose (index_file);
return;
}
if (nitems != 2)
{
error (0, 0, "%s:%d Bad syntax", index_file_name, line);
continue;
}
root = file_name_lookup (name, 0, 0);
if (root == MACH_PORT_NULL)
{
error (0, errno, "%s:%d Filesystem `%s'",
index_file_name, line, name);
free (name);
continue;
}
if (index >= fsystablesize)
{
fsystable = (struct fsys_spec *)
realloc (fsystable, index * 2 * sizeof (struct fsys_spec));
for (i = fsystablesize; i < index * 2; i++)
{
fsystable[i].fsys = MACH_PORT_NULL;
fsystable[i].name = 0;
}
fsystablesize = index * 2;
}
if (index + 1 > nfsys)
nfsys = index + 1;
fsystable[index].name = name;
file_getcontrol (root, &fsystable[index].fsys);
mach_port_deallocate (mach_task_self (), root);
}
}
/* Write the current filesystem table to disk synchronously. */
static void
write_filesystems (void)
{
file_t newindex;
FILE *f;
error_t err;
int i;
if (!index_file_name)
return;
if (index_file_dir == MACH_PORT_NULL)
{
index_file_dir = file_name_split (index_file_name, &index_file_compname);
if (index_file_dir == MACH_PORT_NULL)
{
error (0, errno, "`%s'", index_file_name);
index_file_name = 0;
return;
}
}
/* Create an anonymous file in the same directory */
err = dir_mkfile (index_file_dir, O_WRONLY, 0666, &newindex);
if (err)
{
error (0, err, "`%s'", index_file_name);
index_file_name = 0;
mach_port_deallocate (mach_task_self (), index_file_dir);
index_file_dir = MACH_PORT_NULL;
return;
}
f = fopenport (newindex, "w");
for (i = 0; i < nfsys; i++)
if (fsystable[i].name)
fprintf (f, "%d %s\n", i, fsystable[i].name);
/* Link it in */
err = dir_link (index_file_dir, newindex, index_file_compname, 0);
if (err)
error (0, err, "`%s'", index_file_name);
fflush (f);
file_sync (newindex, 1, 0);
fclose (f);
}
/* From a filesystem ID number, return the fsys_t for talking to that
filesystem; MACH_PORT_NULL if it isn't in our list. */
fsys_t
lookup_filesystem (int id)
{
if (id >= nfsys)
return MACH_PORT_NULL;
return fsystable[id].fsys;
}
/* Enter a name in the table of filesystems; return its ID number.
ROOT refers to the root of this filesystem. */
int
enter_filesystem (char *name, file_t root)
{
int i;
for (i = 0; i < nfsys; i++)
if (fsystable[i].name && !strcmp (fsystable[i].name, name))
return i;
if (nfsys == fsystablesize)
{
fsystable = (struct fsys_spec *) realloc (fsystable,
(fsystablesize * 2)
* sizeof (struct fsys_spec));
for (i = fsystablesize; i < fsystablesize * 2; i++)
{
fsystable[i].fsys = MACH_PORT_NULL;
fsystable[i].name = 0;
}
fsystablesize *= 2;
}
fsystable[nfsys].name = malloc (strlen (name) + 1);
strcpy (fsystable[nfsys].name, name);
file_getcontrol (root, &fsystable[nfsys].fsys);
nfsys++;
write_filesystems ();
return nfsys - 1;
}
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