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 #define BACKING_FILE    "/tmp/ptlbd-backing-file-la-la-la"
  36
  37 static int ptlbd_sv_already_setup = 1;
  38
  39 static int ptlbd_sv_setup(struct obd_device *obddev, obd_count len, void *buf)
  40 {
  41         struct ptlbd_obd *ptlbd = &obddev->u.ptlbd;
  42         int rc;
  43         ENTRY;
  44
  45         ptlbd->filp = filp_open(BACKING_FILE,
  46                                         O_RDWR|O_CREAT|O_LARGEFILE, 0600);
  47
  48         if ( IS_ERR(ptlbd->filp) )
  49                 RETURN(PTR_ERR(ptlbd->filp));
  50
  51         ptlbd->ptlbd_service =
  52                 ptlrpc_init_svc(PTLBD_NBUFS, PTLBD_BUFSIZE, PTLBD_MAXREQSIZE,
  53                                 PTLBD_REQUEST_PORTAL, PTLBD_REPLY_PORTAL,
  54                                 ptlbd_handle, "ptlbd_sv",
  55                                 obddev->obd_proc_entry);
  56
  57         if (ptlbd->ptlbd_service == NULL)
  58                 GOTO(out_filp, rc = -ENOMEM);
  59
  60         rc = ptlrpc_start_n_threads(obddev, ptlbd->ptlbd_service, 1, "ptldb");
  61         if (rc != 0)
  62                 GOTO(out_thread, rc);
  63
  64         ptlbd_sv_already_setup = 1;
  65
  66         RETURN(0);
  67
  68 out_thread:
  69         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  70 out_filp:
  71         filp_close(ptlbd->filp, NULL);
  72
  73         RETURN(rc);
  74 }
  75
  76 static int ptlbd_sv_cleanup(struct obd_device *obddev, int flags)
  77 {
  78         struct ptlbd_obd *ptlbd = &obddev->u.ptlbd;
  79         ENTRY;
  80
  81         /* XXX check for state */
  82
  83         ptlrpc_stop_all_threads(ptlbd->ptlbd_service);
  84         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  85         if ( ! IS_ERR(ptlbd->filp) )
  86                 filp_close(ptlbd->filp, NULL);
  87
  88         ptlbd_sv_already_setup = 0;
  89         RETURN(0);
  90 }
  91
  92 static struct obd_ops ptlbd_sv_obd_ops = {
  93         o_owner:        THIS_MODULE,
  94         o_setup:        ptlbd_sv_setup,
  95         o_cleanup:      ptlbd_sv_cleanup,
  96         o_connect:      class_connect,
  97         o_disconnect:   class_disconnect,
  98 };
  99
 100 static struct lprocfs_vars lprocfs_obd_vars[] = { {0} };
 101 static struct lprocfs_vars lprocfs_module_vars[] = { {0} };
 102 LPROCFS_INIT_VARS(ptlbd_sv, lprocfs_module_vars, lprocfs_obd_vars)
 103
 104 int ptlbd_sv_init(void)
 105 {
 106         struct lprocfs_static_vars lvars;
 107
 108         lprocfs_init_vars(ptlbd_sv,&lvars);
 109         return class_register_type(&ptlbd_sv_obd_ops, lvars.module_vars,
 110                                    OBD_PTLBD_SV_DEVICENAME);
 111 }
 112
 113 void ptlbd_sv_exit(void)
 114 {
 115         class_unregister_type(OBD_PTLBD_SV_DEVICENAME);
 116 }