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-rw-r--r--nfsd/fsys.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/nfsd/fsys.c b/nfsd/fsys.c
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--- /dev/null
+++ b/nfsd/fsys.c
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+/* Filesystem management for NFS server
+ Copyright (C) 1996 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 <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;
+
+ fsystable = (struct fsys_spec *) malloc ((fsystablesize = 10)
+ * sizeof (struct fsys_spec));
+
+ if (!index_file_name)
+ return;
+
+ index_file = fopen (index_file_name, "r");
+ if (!index_file)
+ {
+ fprintf (stderr, "%s: Cannot open `%s': %s\n",
+ program_invocation_name, index_file_name, strerror (errno));
+ return;
+ }
+
+ for (line = 1; ; line++)
+ {
+ nitems = fscanf (index_file, "%d %as\n", &index, &name);
+ if (nitems == EOF)
+ {
+ fclose (index_file);
+ return;
+ }
+
+ if (nitems != 2)
+ {
+ fprintf (stderr, "%s:%s:%d Bad syntax\n",
+ program_invocation_name, index_file_name, line);
+ continue;
+ }
+
+ root = file_name_lookup (name, 0, 0);
+ if (!root)
+ {
+ fprintf (stderr, "%s:%s:%d Filesystem `%s': %s\n",
+ program_invocation_name, index_file_name, line,
+ name, strerror (errno));
+ free (name);
+ continue;
+ }
+
+ if (index >= fsystablesize)
+ fsystable = (struct fsys_spec *) realloc (fsystable,
+ (fsystablesize = index * 2)
+ * sizeof (struct fsys_spec));
+ if (index > nfsys)
+ nfsys = index;
+
+ fsystable[index].name = name;
+ file_getcontrol (root, &fsystable[nfsys].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;
+ 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)
+ {
+ fprintf (stderr, "%s: `%s': %s\n",
+ program_invocation_name, index_file_name, strerror (errno));
+ index_file_name = 0;
+ return;
+ }
+ }
+
+ /* Create an anonymous file in the same directory */
+ errno = dir_mkfile (index_file_dir, O_WRONLY, 0666, &newindex);
+ if (errno)
+ {
+ fprintf (stderr, "%s: `%s': %s\n",
+ program_invocation_name, index_file_name, strerror (errno));
+ 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 */
+ errno = dir_link (index_file_dir, newindex, index_file_compname, 0);
+ if (errno)
+ fprintf (stderr, "%s: `%s': %s\n",
+ program_invocation_name, index_file_name, strerror (errno));
+ 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));
+
+ fsystable[nfsys].name = malloc (strlen (name) + 1);
+ strcpy (fsystable[nfsys].name, name);
+ file_getcontrol (root, &fsystable[nfsys].fsys);
+ nfsys++;
+
+ write_filesystems ();
+
+ return nfsys - 1;
+}
+