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 *obd, obd_count len, void *buf)
  40 {
  41         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  42         struct lprocfs_static_vars lvars;
  43         int rc;
  44         ENTRY;
  45
  46         ptlbd->filp = filp_open(BACKING_FILE,
  47                                         O_RDWR|O_CREAT|O_LARGEFILE, 0600);
  48
  49         if ( IS_ERR(ptlbd->filp) )
  50                 RETURN(PTR_ERR(ptlbd->filp));
  51
  52         lprocfs_init_vars(ptlbd_sv, &lvars);
  53         lprocfs_obd_setup(obd, lvars.obd_vars);
  54
  55         ptlbd->ptlbd_service =
  56                 ptlrpc_init_svc(PTLBD_NBUFS, PTLBD_BUFSIZE, PTLBD_MAXREQSIZE,
  57                                 PTLBD_REQUEST_PORTAL, PTLBD_REPLY_PORTAL,
  58                                 ptlbd_handle, "ptlbd_sv",
  59                                 obd->obd_proc_entry);
  60
  61         if (ptlbd->ptlbd_service == NULL)
  62                 GOTO(out_filp, rc = -ENOMEM);
  63
  64         rc = ptlrpc_start_n_threads(obd, ptlbd->ptlbd_service, 1, "ptldb");
  65         if (rc != 0)
  66                 GOTO(out_thread, rc);
  67
  68         ptlbd_sv_already_setup = 1;
  69
  70         RETURN(0);
  71
  72 out_thread:
  73         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  74 out_filp:
  75         filp_close(ptlbd->filp, NULL);
  76         lprocfs_obd_cleanup(obd);
  77
  78         RETURN(rc);
  79 }
  80
  81 static int ptlbd_sv_cleanup(struct obd_device *obd, int flags)
  82 {
  83         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  84         ENTRY;
  85
  86         /* XXX check for state */
  87
  88         ptlrpc_stop_all_threads(ptlbd->ptlbd_service);
  89         ptlrpc_unregister_service(ptlbd->ptlbd_service);
  90         if ( ! IS_ERR(ptlbd->filp) )
  91                 filp_close(ptlbd->filp, NULL);
  92
  93         ptlbd_sv_already_setup = 0;
  94
  95         lprocfs_obd_cleanup(obd);
  96
  97         RETURN(0);
  98 }
  99
 100 static struct obd_ops ptlbd_sv_obd_ops = {
 101         .o_owner        = THIS_MODULE,
 102         .o_setup        = ptlbd_sv_setup,
 103         .o_cleanup      = ptlbd_sv_cleanup,
 104         .o_connect      = class_connect,
 105         .o_disconnect   = class_disconnect,
 106 };
 107
 108 static struct lprocfs_vars lprocfs_obd_vars[] = { {0} };
 109 static struct lprocfs_vars lprocfs_module_vars[] = { {0} };
 110 LPROCFS_INIT_VARS(ptlbd_sv, lprocfs_module_vars, lprocfs_obd_vars)
 111
 112 int ptlbd_sv_init(void)
 113 {
 114         struct lprocfs_static_vars lvars;
 115
 116         lprocfs_init_vars(ptlbd_sv,&lvars);
 117         return class_register_type(&ptlbd_sv_obd_ops, lvars.module_vars,
 118                                    OBD_PTLBD_SV_DEVICENAME);
 119 }
 120
 121 void ptlbd_sv_exit(void)
 122 {
 123         class_unregister_type(OBD_PTLBD_SV_DEVICENAME);
 124 }