lustre/osc/osc_create.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   5  *   Author Peter Braam <braam@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  *  For testing and management it is treated as an obd_device,
  23  *  although * it does not export a full OBD method table (the
  24  *  requests are coming * in over the wire, so object target modules
  25  *  do not have a full * method table.)
  26  *
  27  */
  28
  29 #ifndef EXPORT_SYMTAB
  30 # define EXPORT_SYMTAB
  31 #endif
  32 #define DEBUG_SUBSYSTEM S_OSC
  33
  34 #ifdef __KERNEL__
  35 # include <linux/version.h>
  36 # include <linux/module.h>
  37 # include <linux/mm.h>
  38 # include <linux/highmem.h>
  39 # include <linux/ctype.h>
  40 # include <linux/init.h>
  41 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  42 #  include <linux/workqueue.h>
  43 #  include <linux/smp_lock.h>
  44 # else
  45 #  include <linux/locks.h>
  46 # endif
  47 #else /* __KERNEL__ */
  48 # include <liblustre.h>
  49 #endif
  50
  51 #ifdef  __CYGWIN__
  52 # include <ctype.h>
  53 #endif
  54
  55 # include <linux/lustre_dlm.h>
  56 #include <linux/obd_class.h>
  57 #include "osc_internal.h"
  58
  59 int oscc_recovering(struct osc_creator *oscc)
  60 {
  61         int recov = 0;
  62
  63         spin_lock(&oscc->oscc_lock);
  64         recov = oscc->oscc_flags & OSCC_FLAG_RECOVERING;
  65         spin_unlock(&oscc->oscc_lock);
  66
  67         return recov;
  68 }
  69
  70 /* this only is used now for deleting orphanes */
  71 int osc_create(struct obd_export *exp, struct obdo *oa,
  72                void *acl, int acl_size, struct lov_stripe_md **ea,
  73                struct obd_trans_info *oti)
  74 {
  75         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
  76         int rc = 0, try_again = 1;
  77         ENTRY;
  78
  79         LASSERT(oa);
  80         LASSERT(ea);
  81         LASSERT(oa->o_gr > 0);
  82         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
  83         LASSERT(acl == NULL && acl_size == 0);
  84
  85         if (oa->o_gr == FILTER_GROUP_LLOG || oa->o_gr == FILTER_GROUP_ECHO)
  86                 RETURN(osc_real_create(exp, oa, ea, oti));
  87
  88         /* this is the special case where create removes orphans */
  89         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
  90             oa->o_flags == OBD_FL_DELORPHAN) {
  91                 spin_lock(&oscc->oscc_lock);
  92                 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
  93                         spin_unlock(&oscc->oscc_lock);
  94                         return -EBUSY;
  95                 }
  96                 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
  97                         spin_unlock(&oscc->oscc_lock);
  98                         return 0;
  99                 }
 100                 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
 101                 spin_unlock(&oscc->oscc_lock);
 102                 CDEBUG(D_HA, "%s; oscc recovery started\n",
 103                        exp->exp_obd->obd_name);
 104                 LASSERT(oscc->oscc_flags & OSCC_FLAG_RECOVERING);
 105
 106                 CDEBUG(D_HA, "%s: deleting to next_id: "LPU64"\n",
 107                        oscc->oscc_obd->obd_name, oa->o_id);
 108
 109                 rc = osc_real_create(exp, oa, ea, NULL);
 110                 if (oscc->oscc_obd == NULL) {
 111                         CWARN("the obd for oscc %p has been freed\n", oscc);
 112                         RETURN(rc);
 113                 }
 114
 115                 spin_lock(&oscc->oscc_lock);
 116                 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
 117                 if (rc == 0 || rc == -ENOSPC) {
 118                         if (rc == -ENOSPC)
 119                                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 120                         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 121                         CDEBUG(D_HA, "%s: oscc recovery finished: %d\n",
 122                                oscc->oscc_obd->obd_name, rc);
 123                         wake_up(&oscc->oscc_waitq);
 124                 } else {
 125                         CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
 126                                oscc->oscc_obd->obd_name, rc);
 127                 }
 128                 spin_unlock(&oscc->oscc_lock);
 129                 RETURN(rc);
 130         }
 131
 132         while (try_again) {
 133                 /* If orphans are being recovered, then we must wait until
 134                    it is finished before we can continue with create. */
 135                 if (oscc_recovering(oscc)) {
 136                         struct l_wait_info lwi;
 137
 138                         CDEBUG(D_HA,"%p: oscc recovery in progress, waiting\n",
 139                                oscc);
 140
 141                         lwi = LWI_TIMEOUT(MAX(obd_timeout*HZ/4, 1), NULL, NULL);
 142                         rc = l_wait_event(oscc->oscc_waitq,
 143                                           !oscc_recovering(oscc), &lwi);
 144                         LASSERT(rc == 0 || rc == -ETIMEDOUT);
 145                         if (rc == -ETIMEDOUT) {
 146                                 CDEBUG(D_ERROR,"%p: timeout waiting on recovery\n",
 147                                        oscc);
 148                                 RETURN(rc);
 149                         }
 150                         CDEBUG(D_HA, "%p: oscc recovery over, waking up\n",
 151                                oscc);
 152                 }
 153
 154                 spin_lock(&oscc->oscc_lock);
 155                 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
 156                         spin_unlock(&oscc->oscc_lock);
 157                         break;
 158                 }
 159
 160                 if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 161                         rc = -ENOSPC;
 162                         spin_unlock(&oscc->oscc_lock);
 163                         break;
 164                 }
 165
 166                 oscc->oscc_next_id++;
 167                 oa->o_id = oscc->oscc_next_id;
 168                 try_again = 0;
 169                 spin_unlock(&oscc->oscc_lock);
 170
 171                 CDEBUG(D_HA, "%s: returning objid "LPU64"\n",
 172                        oscc->oscc_obd->u.cli.cl_import->imp_target_uuid.uuid,
 173                        oa->o_id);
 174         }
 175
 176         RETURN(rc);
 177 }
 178
 179 void oscc_init(struct obd_device *obd)
 180 {
 181         struct osc_creator *oscc;
 182
 183         if (obd == NULL)
 184                 return;
 185
 186         oscc = &obd->u.cli.cl_oscc;
 187         memset(oscc, 0, sizeof(*oscc));
 188
 189         oscc->oscc_obd = obd;
 190         spin_lock_init(&oscc->oscc_lock);
 191         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 192         init_waitqueue_head(&oscc->oscc_waitq);
 193 }