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 the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  *
  25  *  For testing and management it is treated as an obd_device,
  26  *  although * it does not export a full OBD method table (the
  27  *  requests are coming * in over the wire, so object target modules
  28  *  do not have a full * method table.)
  29  *
  30  */
  31
  32 #ifndef EXPORT_SYMTAB
  33 # define EXPORT_SYMTAB
  34 #endif
  35 #define DEBUG_SUBSYSTEM S_OSC
  36
  37 #ifdef __KERNEL__
  38 # include <libcfs/libcfs.h>
  39 #else /* __KERNEL__ */
  40 # include <liblustre.h>
  41 #endif
  42
  43 #ifdef  __CYGWIN__
  44 # include <ctype.h>
  45 #endif
  46
  47 # include <lustre_dlm.h>
  48 #include <obd_class.h>
  49 #include "osc_internal.h"
  50
  51 static int osc_interpret_create(struct ptlrpc_request *req, void *data, int rc)
  52 {
  53         struct osc_creator *oscc;
  54         struct ost_body *body = NULL;
  55         ENTRY;
  56
  57         if (req->rq_repmsg) {
  58                 body = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*body),
  59                                           lustre_swab_ost_body);
  60                 if (body == NULL && rc == 0)
  61                         rc = -EPROTO;
  62         }
  63
  64         oscc = req->rq_async_args.pointer_arg[0];
  65         LASSERT(oscc && (oscc->oscc_obd != LP_POISON));
  66
  67         spin_lock(&oscc->oscc_lock);
  68         oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
  69         if (rc == -ENOSPC || rc == -EROFS) {
  70                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
  71                 if (body && rc == -ENOSPC) {
  72                         oscc->oscc_grow_count = OST_MIN_PRECREATE;
  73                         oscc->oscc_last_id = body->oa.o_id;
  74                 }
  75                 spin_unlock(&oscc->oscc_lock);
  76                 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
  77         } else if (rc != 0 && rc != -EIO) {
  78                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
  79                 oscc->oscc_grow_count = OST_MIN_PRECREATE;
  80                 spin_unlock(&oscc->oscc_lock);
  81                 DEBUG_REQ(D_ERROR, req,
  82                           "unknown rc %d from async create: failing oscc", rc);
  83                 ptlrpc_fail_import(req->rq_import,
  84                                    lustre_msg_get_conn_cnt(req->rq_reqmsg));
  85         } else {
  86                 if (rc == 0) {
  87                         if (body) {
  88                                 int diff = body->oa.o_id - oscc->oscc_last_id;
  89
  90                                 if (diff < oscc->oscc_grow_count)
  91                                         oscc->oscc_grow_count =
  92                                                 max(diff/3, OST_MIN_PRECREATE);
  93                                 else
  94                                         oscc->oscc_flags &= ~OSCC_FLAG_LOW;
  95                                 oscc->oscc_last_id = body->oa.o_id;
  96                         }
  97                 } else {
  98                         /* filter always set body->oa.o_id as the last_id
  99                          * of filter (see filter_handle_precreate for detail)*/
 100                         if (body && body->oa.o_id > oscc->oscc_last_id)
 101                                 oscc->oscc_last_id = body->oa.o_id;
 102                 }
 103                 spin_unlock(&oscc->oscc_lock);
 104
 105         }
 106
 107         CDEBUG(D_HA, "preallocated through id "LPU64" (next to use "LPU64")\n",
 108                oscc->oscc_last_id, oscc->oscc_next_id);
 109
 110         cfs_waitq_signal(&oscc->oscc_waitq);
 111         RETURN(rc);
 112 }
 113
 114 static int oscc_internal_create(struct osc_creator *oscc)
 115 {
 116         struct ptlrpc_request *request;
 117         struct ost_body *body;
 118         int size[] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 119         ENTRY;
 120
 121         spin_lock(&oscc->oscc_lock);
 122         if (oscc->oscc_grow_count < OST_MAX_PRECREATE &&
 123             !(oscc->oscc_flags & (OSCC_FLAG_LOW | OSCC_FLAG_RECOVERING)) &&
 124             (__s64)(oscc->oscc_last_id - oscc->oscc_next_id) <=
 125                    (oscc->oscc_grow_count / 4 + 1)) {
 126                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 127                 oscc->oscc_grow_count *= 2;
 128         }
 129
 130         if (oscc->oscc_grow_count > OST_MAX_PRECREATE / 2)
 131                 oscc->oscc_grow_count = OST_MAX_PRECREATE / 2;
 132
 133         if (oscc->oscc_flags & OSCC_FLAG_CREATING ||
 134             oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 135                 spin_unlock(&oscc->oscc_lock);
 136                 RETURN(0);
 137         }
 138         oscc->oscc_flags |= OSCC_FLAG_CREATING;
 139         spin_unlock(&oscc->oscc_lock);
 140
 141         request = ptlrpc_prep_req(oscc->oscc_obd->u.cli.cl_import,
 142                                   LUSTRE_OST_VERSION, OST_CREATE, 2,
 143                                   size, NULL);
 144         if (request == NULL) {
 145                 spin_lock(&oscc->oscc_lock);
 146                 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
 147                 spin_unlock(&oscc->oscc_lock);
 148                 RETURN(-ENOMEM);
 149         }
 150
 151         request->rq_request_portal = OST_CREATE_PORTAL; //XXX FIXME bug 249
 152         body = lustre_msg_buf(request->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 153
 154         spin_lock(&oscc->oscc_lock);
 155         body->oa.o_id = oscc->oscc_last_id + oscc->oscc_grow_count;
 156         body->oa.o_valid |= OBD_MD_FLID;
 157         spin_unlock(&oscc->oscc_lock);
 158         CDEBUG(D_HA, "preallocating through id "LPU64" (last seen "LPU64")\n",
 159                body->oa.o_id, oscc->oscc_last_id);
 160
 161         ptlrpc_req_set_repsize(request, 2, size);
 162
 163         request->rq_async_args.pointer_arg[0] = oscc;
 164         request->rq_interpret_reply = osc_interpret_create;
 165         ptlrpcd_add_req(request);
 166
 167         RETURN(0);
 168 }
 169
 170 static int oscc_has_objects(struct osc_creator *oscc, int count)
 171 {
 172         int have_objs;
 173         spin_lock(&oscc->oscc_lock);
 174         have_objs = ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
 175         spin_unlock(&oscc->oscc_lock);
 176
 177         if (!have_objs)
 178                 oscc_internal_create(oscc);
 179
 180         return have_objs;
 181 }
 182
 183 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
 184 {
 185         int have_objs;
 186         int ost_full;
 187         int osc_invalid;
 188
 189         have_objs = oscc_has_objects(oscc, count);
 190
 191         spin_lock(&oscc->oscc_lock);
 192         ost_full = (oscc->oscc_flags & OSCC_FLAG_NOSPC);
 193         spin_unlock(&oscc->oscc_lock);
 194
 195         osc_invalid = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
 196
 197         return have_objs || ost_full || osc_invalid;
 198 }
 199
 200 static int oscc_precreate(struct osc_creator *oscc, int wait)
 201 {
 202         struct l_wait_info lwi = { 0 };
 203         int rc = 0;
 204         ENTRY;
 205
 206         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 207                 RETURN(0);
 208
 209         if (!wait)
 210                 RETURN(0);
 211
 212         /* no rc check -- a no-INTR, no-TIMEOUT wait can't fail */
 213         l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
 214
 215         if (!oscc_has_objects(oscc, 1) && (oscc->oscc_flags & OSCC_FLAG_NOSPC))
 216                 rc = -ENOSPC;
 217
 218         if (oscc->oscc_obd->u.cli.cl_import->imp_invalid)
 219                 rc = -EIO;
 220
 221         RETURN(rc);
 222 }
 223
 224 int oscc_recovering(struct osc_creator *oscc)
 225 {
 226         int recov = 0;
 227
 228         spin_lock(&oscc->oscc_lock);
 229         recov = oscc->oscc_flags & OSCC_FLAG_RECOVERING;
 230         spin_unlock(&oscc->oscc_lock);
 231
 232         return recov;
 233 }
 234
 235 int osc_create(struct obd_export *exp, struct obdo *oa,
 236                struct lov_stripe_md **ea, struct obd_trans_info *oti)
 237 {
 238         struct lov_stripe_md *lsm;
 239         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 240         int try_again = 1, rc = 0;
 241         ENTRY;
 242         LASSERT(oa);
 243         LASSERT(ea);
 244
 245         if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0))
 246                 RETURN(osc_real_create(exp, oa, ea, oti));
 247
 248         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 249             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 250                 RETURN(osc_real_create(exp, oa, ea, oti));
 251         }
 252
 253         /* this is the special case where create removes orphans */
 254         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 255             oa->o_flags == OBD_FL_DELORPHAN) {
 256                 spin_lock(&oscc->oscc_lock);
 257                 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
 258                         spin_unlock(&oscc->oscc_lock);
 259                         RETURN(-EBUSY);
 260                 }
 261                 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
 262                         spin_unlock(&oscc->oscc_lock);
 263                         RETURN(0);
 264                 }
 265                 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
 266                 spin_unlock(&oscc->oscc_lock);
 267                 CDEBUG(D_HA, "%s: oscc recovery started\n",
 268                        oscc->oscc_obd->obd_name);
 269
 270                 /* delete from next_id on up */
 271                 oa->o_valid |= OBD_MD_FLID;
 272                 oa->o_id = oscc->oscc_next_id - 1;
 273
 274                 CDEBUG(D_HA, "%s: deleting to next_id: "LPU64"\n",
 275                        oscc->oscc_obd->obd_name, oa->o_id);
 276
 277                 rc = osc_real_create(exp, oa, ea, NULL);
 278
 279                 spin_lock(&oscc->oscc_lock);
 280                 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
 281                 if (rc == 0 || rc == -ENOSPC) {
 282                         if (rc == -ENOSPC)
 283                                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 284                         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 285                         oscc->oscc_last_id = oa->o_id;
 286                         CDEBUG(D_HA, "%s: oscc recovery finished, last_id: "
 287                                LPU64", rc: %d\n", oscc->oscc_obd->obd_name,
 288                                oscc->oscc_last_id, rc);
 289                         cfs_waitq_signal(&oscc->oscc_waitq);
 290                 } else {
 291                         CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
 292                                oscc->oscc_obd->obd_name, rc);
 293                 }
 294                 spin_unlock(&oscc->oscc_lock);
 295
 296
 297                 RETURN(rc);
 298         }
 299
 300         lsm = *ea;
 301         if (lsm == NULL) {
 302                 rc = obd_alloc_memmd(exp, &lsm);
 303                 if (rc < 0)
 304                         RETURN(rc);
 305         }
 306
 307         while (try_again) {
 308                 /* If orphans are being recovered, then we must wait until
 309                    it is finished before we can continue with create. */
 310                 if (oscc_recovering(oscc)) {
 311                         struct l_wait_info lwi;
 312
 313                         CDEBUG(D_HA,"%p: oscc recovery in progress, waiting\n",
 314                                oscc);
 315
 316                         lwi = LWI_TIMEOUT(cfs_timeout_cap(cfs_time_seconds(obd_timeout/4)),
 317                                           NULL, NULL);
 318                         rc = l_wait_event(oscc->oscc_waitq,
 319                                           !oscc_recovering(oscc), &lwi);
 320                         LASSERT(rc == 0 || rc == -ETIMEDOUT);
 321                         if (rc == -ETIMEDOUT) {
 322                                 CDEBUG(D_HA,"%p: timeout waiting on recovery\n",
 323                                        oscc);
 324                                 RETURN(rc);
 325                         }
 326                         CDEBUG(D_HA, "%p: oscc recovery over, waking up\n",
 327                                oscc);
 328                 }
 329
 330                 spin_lock(&oscc->oscc_lock);
 331                 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
 332                         spin_unlock(&oscc->oscc_lock);
 333                         break;
 334                 }
 335
 336                 if (oscc->oscc_last_id >= oscc->oscc_next_id) {
 337                         memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 338                         oa->o_id = oscc->oscc_next_id;
 339                         lsm->lsm_object_id = oscc->oscc_next_id;
 340                         *ea = lsm;
 341                         oscc->oscc_next_id++;
 342                         try_again = 0;
 343
 344                         CDEBUG(D_HA, "%s: set oscc_next_id = "LPU64"\n",
 345                                exp->exp_obd->obd_name, oscc->oscc_next_id);
 346                 } else if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 347                         rc = -ENOSPC;
 348                         spin_unlock(&oscc->oscc_lock);
 349                         break;
 350                 }
 351                 spin_unlock(&oscc->oscc_lock);
 352                 rc = oscc_precreate(oscc, try_again);
 353                 if (rc)
 354                         break;
 355         }
 356
 357         if (rc == 0)
 358                 CDEBUG(D_HA, "%s: returning objid "LPU64"\n",
 359                        obd2cli_tgt(oscc->oscc_obd), lsm->lsm_object_id);
 360         else if (*ea == NULL)
 361                 obd_free_memmd(exp, &lsm);
 362         RETURN(rc);
 363 }
 364
 365 void oscc_init(struct obd_device *obd)
 366 {
 367         struct osc_creator *oscc;
 368
 369         if (obd == NULL)
 370                 return;
 371
 372         oscc = &obd->u.cli.cl_oscc;
 373
 374         memset(oscc, 0, sizeof(*oscc));
 375         CFS_INIT_LIST_HEAD(&oscc->oscc_list);
 376         cfs_waitq_init(&oscc->oscc_waitq);
 377         spin_lock_init(&oscc->oscc_lock);
 378         oscc->oscc_obd = obd;
 379         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 380
 381         oscc->oscc_next_id = 2;
 382         oscc->oscc_last_id = 1;
 383         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 384         /* XXX the export handle should give the oscc the last object */
 385         /* oed->oed_oscc.oscc_last_id = exph->....; */
 386 }