lustre/ptlbd/server.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Zach Brown <zab@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/version.h>
  24 #include <linux/module.h>
  25 #include <linux/fs.h>
  26
  27 #define DEBUG_SUBSYSTEM S_PTLBD
  28
  29 #include <linux/obd_support.h>
  30 #include <linux/obd_class.h>
  31 #include <linux/lustre_debug.h>
  32 #include <linux/lprocfs_status.h>
  33 #include <linux/obd_ptlbd.h>
  34
  35 static int ptlbd_sv_already_setup = 1;
  36
  37 static int ptlbd_sv_setup(struct obd_device *obddev, obd_count len, void *buf)
  38 {
  39         struct ptlbd_obd *ptlbd = &obddev->u.ptlbd;
  40         int rc;
  41         ENTRY;
  42
  43         ptlbd->filp = filp_open("/tmp/ptlbd-backing-file-la-la-la",
  44                                         O_RDWR|O_CREAT, 0600);
  45         if ( IS_ERR(ptlbd->filp) )
  46                 RETURN(PTR_ERR(ptlbd->filp));
  47
  48         ptlbd->ptlbd_service =
  49                 ptlrpc_init_svc(PTLBD_NEVENTS, PTLBD_NBUFS, PTLBD_BUFSIZE,
  50                                 PTLBD_MAXREQSIZE, PTLBD_REQUEST_PORTAL,
  51                                 PTLBD_REPLY_PORTAL,
  52                                 ptlbd_parse_req, "ptlbd_sv");
  53
  54         if (ptlbd->ptlbd_service == NULL)
  55                 GOTO(out_filp, rc = -ENOMEM);
  56
  57         rc = ptlrpc_start_thread(obddev, ptlbd->ptlbd_service, "ptldb");
  58         if (rc != 0)
  59                 GOTO(out_thread, rc);
  60
  61         ptlbd_sv_already_setup = 1;
  62
  63         RETURN(0);
  64
  65 out_thread:
  66         ptlrpc_stop_all_threads(ptlbd->ptlbd_service);
  67         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  68 out_filp:
  69         filp_close(ptlbd->filp, NULL);
  70
  71         RETURN(rc);
  72 }
  73
  74 static int ptlbd_sv_cleanup(struct obd_device *obddev)
  75 {
  76         struct ptlbd_obd *ptlbd = &obddev->u.ptlbd;
  77         ENTRY;
  78
  79         /* XXX check for state */
  80
  81         ptlrpc_stop_all_threads(ptlbd->ptlbd_service);
  82         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  83         if ( ! IS_ERR(ptlbd->filp) )
  84                 filp_close(ptlbd->filp, NULL);
  85
  86         ptlbd_sv_already_setup = 0;
  87         RETURN(0);
  88 }
  89
  90 static struct obd_ops ptlbd_sv_obd_ops = {
  91         o_owner:        THIS_MODULE,
  92         o_setup:        ptlbd_sv_setup,
  93         o_cleanup:      ptlbd_sv_cleanup,
  94 };
  95
  96 int ptlbd_sv_init(void)
  97 {
  98         struct lprocfs_static_vars lvars;
  99
 100         lprocfs_init_vars(&lvars);
 101         return class_register_type(&ptlbd_sv_obd_ops, lvars.module_vars,
 102                                    OBD_PTLBD_SV_DEVICENAME);
 103 }
 104
 105 void ptlbd_sv_exit(void)
 106 {
 107         class_unregister_type(OBD_PTLBD_SV_DEVICENAME);
 108 }