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 static int osc_interpret_create(struct ptlrpc_request *req, void *data,
  60                                 int rc)
  61 {
  62         struct osc_creator *oscc;
  63         struct ost_body *body = NULL;
  64         ENTRY;
  65
  66         if (req->rq_repmsg) {
  67                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
  68                                           lustre_swab_ost_body);
  69                 if (body == NULL && rc == 0)
  70                         rc = -EPROTO;
  71         }
  72
  73         oscc = req->rq_async_args.pointer_arg[0];
  74         spin_lock(&oscc->oscc_lock);
  75         if (body)
  76                 oscc->oscc_last_id = body->oa.o_id;
  77         if (rc == -ENOSPC) {
  78                 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
  79                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
  80         } else if (rc != 0 && rc != -EIO) {
  81                 DEBUG_REQ(D_ERROR, req,
  82                           "unknown rc %d from async create: failing oscc",
  83                           rc);
  84                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
  85                 ptlrpc_fail_import(req->rq_import, req->rq_import_generation);
  86         }
  87         oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
  88         spin_unlock(&oscc->oscc_lock);
  89
  90         CDEBUG(D_INFO, "preallocated through id "LPU64" (last used "LPU64")\n",
  91                oscc->oscc_last_id, oscc->oscc_next_id);
  92
  93         wake_up(&oscc->oscc_waitq);
  94         RETURN(rc);
  95 }
  96
  97 static int oscc_internal_create(struct osc_creator *oscc)
  98 {
  99         struct ptlrpc_request *request;
 100         struct ost_body *body;
 101         int size = sizeof(*body);
 102         ENTRY;
 103
 104         spin_lock(&oscc->oscc_lock);
 105         if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
 106                 spin_unlock(&oscc->oscc_lock);
 107                 RETURN(0);
 108         }
 109         oscc->oscc_flags |= OSCC_FLAG_CREATING;
 110         spin_unlock(&oscc->oscc_lock);
 111
 112         request = ptlrpc_prep_req(oscc->oscc_obd->u.cli.cl_import, OST_CREATE,
 113                                   1, &size, NULL);
 114         if (request == NULL) {
 115                 spin_lock(&oscc->oscc_lock);
 116                 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
 117                 spin_unlock(&oscc->oscc_lock);
 118                 RETURN(-ENOMEM);
 119         }
 120
 121         request->rq_request_portal = OST_CREATE_PORTAL; //XXX FIXME bug 249
 122         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof(*body));
 123
 124         spin_lock(&oscc->oscc_lock);
 125         body->oa.o_id = oscc->oscc_last_id + oscc->oscc_grow_count;
 126         body->oa.o_valid |= OBD_MD_FLID;
 127         CDEBUG(D_INFO, "preallocating through id "LPU64" (last used "LPU64")\n",
 128                body->oa.o_id, oscc->oscc_next_id);
 129         spin_unlock(&oscc->oscc_lock);
 130
 131         request->rq_replen = lustre_msg_size(1, &size);
 132
 133         request->rq_async_args.pointer_arg[0] = oscc;
 134         request->rq_interpret_reply = osc_interpret_create;
 135         ptlrpcd_add_req(request);
 136
 137         RETURN(0);
 138 }
 139
 140 static int oscc_has_objects(struct osc_creator *oscc, int count)
 141 {
 142         int have_objs;
 143         spin_lock(&oscc->oscc_lock);
 144         have_objs = ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
 145         spin_unlock(&oscc->oscc_lock);
 146
 147         if (!have_objs)
 148                 oscc_internal_create(oscc);
 149
 150         return have_objs;
 151 }
 152
 153 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
 154 {
 155         int have_objs;
 156         int ost_full;
 157         int osc_invalid;
 158
 159         have_objs = oscc_has_objects(oscc, count);
 160
 161         spin_lock(&oscc->oscc_lock);
 162         ost_full = (oscc->oscc_flags & OSCC_FLAG_NOSPC);
 163         spin_unlock(&oscc->oscc_lock);
 164
 165         osc_invalid = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
 166
 167         return have_objs || ost_full || osc_invalid;
 168 }
 169
 170 static int oscc_precreate(struct osc_creator *oscc, int wait)
 171 {
 172         struct l_wait_info lwi = { 0 };
 173         int rc = 0;
 174         ENTRY;
 175
 176         if (oscc_has_objects(oscc, oscc->oscc_kick_barrier))
 177                 RETURN(0);
 178
 179         if (!wait)
 180                 RETURN(0);
 181
 182         /* no rc check -- a no-INTR, no-TIMEOUT wait can't fail */
 183         l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
 184
 185         if (!oscc_has_objects(oscc, 1) && (oscc->oscc_flags & OSCC_FLAG_NOSPC))
 186                 rc = -ENOSPC;
 187
 188         if (oscc->oscc_obd->u.cli.cl_import->imp_invalid)
 189                 rc = -EIO;
 190
 191         RETURN(rc);
 192 }
 193
 194 int oscc_recovering(struct osc_creator *oscc)
 195 {
 196         int recov = 0;
 197
 198         spin_lock(&oscc->oscc_lock);
 199         recov = oscc->oscc_flags & OSCC_FLAG_RECOVERING;
 200         spin_unlock(&oscc->oscc_lock);
 201
 202         return recov;
 203 }
 204
 205 int osc_create(struct obd_export *exp, struct obdo *oa,
 206                struct lov_stripe_md **ea, struct obd_trans_info *oti)
 207 {
 208         struct lov_stripe_md *lsm;
 209         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 210         int try_again = 1, rc = 0;
 211         ENTRY;
 212         LASSERT(oa);
 213         LASSERT(ea);
 214
 215         if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0))
 216                 RETURN(osc_real_create(exp, oa, ea, oti));
 217
 218         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 219             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 220                 RETURN(osc_real_create(exp, oa, ea, oti));
 221         }
 222
 223         lsm = *ea;
 224         if (lsm == NULL) {
 225                 rc = obd_alloc_memmd(exp, &lsm);
 226                 if (rc < 0)
 227                         RETURN(rc);
 228         }
 229
 230         /* this is the special case where create removes orphans */
 231         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 232             oa->o_flags == OBD_FL_DELORPHAN) {
 233                 CDEBUG(D_HA, "%p: oscc recovery started\n", oscc);
 234                 /* delete from next_id on up */
 235                 oa->o_valid |= OBD_MD_FLID;
 236                 oa->o_id = oscc->oscc_next_id - 1;
 237
 238                 rc = osc_real_create(exp, oa, ea, NULL);
 239
 240                 spin_lock(&oscc->oscc_lock);
 241                 if (rc == -ENOSPC)
 242                         oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 243                 oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 244                 oscc->oscc_last_id = oa->o_id;
 245                 wake_up(&oscc->oscc_waitq);
 246                 spin_unlock(&oscc->oscc_lock);
 247
 248                 CDEBUG(D_HA, "%p: oscc recovery finished\n", oscc);
 249
 250                 RETURN(rc);
 251         }
 252
 253         /* If orphans are being recovered, then we must wait until it is
 254            finished before we can continue with create. */
 255         if (oscc_recovering(oscc)) {
 256                 struct l_wait_info lwi;
 257
 258                 CDEBUG(D_HA, "%p: oscc recovery in progress, waiting\n", oscc);
 259
 260                 lwi = LWI_TIMEOUT(MAX(obd_timeout * HZ, 1), NULL, NULL);
 261                 rc = l_wait_event(oscc->oscc_waitq, !oscc_recovering(oscc),
 262                                   &lwi);
 263                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
 264                 if (rc == -ETIMEDOUT) {
 265                         CDEBUG(D_HA, "%p: timed out waiting for recovery\n", oscc);
 266                         RETURN(rc);
 267                 }
 268                 CDEBUG(D_HA, "%p: oscc recovery over, waking up\n", oscc);
 269         }
 270
 271
 272         while (try_again) {
 273                 spin_lock(&oscc->oscc_lock);
 274                 if (oscc->oscc_last_id >= oscc->oscc_next_id) {
 275                         memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 276                         oa->o_id = oscc->oscc_next_id;
 277                         lsm->lsm_object_id = oscc->oscc_next_id;
 278                         *ea = lsm;
 279                         oscc->oscc_next_id++;
 280                         try_again = 0;
 281                 } else if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 282                         rc = -ENOSPC;
 283                         spin_unlock(&oscc->oscc_lock);
 284                         break;
 285                 }
 286                 spin_unlock(&oscc->oscc_lock);
 287                 rc = oscc_precreate(oscc, try_again);
 288                 if (rc == -EIO)
 289                         break;
 290         }
 291
 292         if (rc == 0)
 293                 CDEBUG(D_INFO, "returning objid "LPU64"\n", lsm->lsm_object_id);
 294         else if (*ea == NULL)
 295                 obd_free_memmd(exp, &lsm);
 296         RETURN(rc);
 297 }
 298
 299 void oscc_init(struct obd_device *obd)
 300 {
 301         struct osc_creator *oscc;
 302
 303         if (obd == NULL)
 304                 return;
 305
 306         oscc = &obd->u.cli.cl_oscc;
 307
 308         memset(oscc, 0, sizeof(*oscc));
 309         INIT_LIST_HEAD(&oscc->oscc_list);
 310         init_waitqueue_head(&oscc->oscc_waitq);
 311         spin_lock_init(&oscc->oscc_lock);
 312         oscc->oscc_obd = obd;
 313         oscc->oscc_kick_barrier = 100;
 314         oscc->oscc_grow_count = 2000;
 315         oscc->oscc_initial_create_count = 2000;
 316
 317         oscc->oscc_next_id = 2;
 318         oscc->oscc_last_id = 1;
 319         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 320         /* XXX the export handle should give the oscc the last object */
 321         /* oed->oed_oscc.oscc_last_id = exph->....; */
 322 }