lustre/obdfilter/filter.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/fs/obdfilter/filter.c
   5  *
   6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   7  *   Author: Peter Braam <braam@clusterfs.com>
   8  *   Author: Andreas Dilger <adilger@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 /*
  27  * Invariant: Get O/R i_sem for lookup, if needed, before any journal ops
  28  *            (which need to get journal_lock, may block if journal full).
  29  *
  30  * Invariant: Call filter_start_transno() before any journal ops to avoid the
  31  *            same deadlock problem.  We can (and want) to get rid of the
  32  *            transno sem in favour of the dir/inode i_sem to avoid single
  33  *            threaded operation on the OST.
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_FILTER
  37
  38 #include <linux/config.h>
  39 #include <linux/module.h>
  40 #include <linux/fs.h>
  41 #include <linux/dcache.h>
  42 #include <linux/init.h>
  43 #include <linux/version.h>
  44 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  45 # include <linux/mount.h>
  46 # include <linux/buffer_head.h>
  47 #endif
  48
  49 #include <linux/obd_class.h>
  50 #include <linux/obd_lov.h>
  51 #include <linux/lustre_dlm.h>
  52 #include <linux/lustre_fsfilt.h>
  53 #include <linux/lprocfs_status.h>
  54 #include <linux/lustre_log.h>
  55 #include <linux/lustre_commit_confd.h>
  56
  57 #include "filter_internal.h"
  58
  59 static struct lvfs_callback_ops filter_lvfs_ops;
  60
  61 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
  62                           struct lov_stripe_md *ea, struct obd_trans_info *);
  63
  64 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
  65                              void *cb_data, int error)
  66 {
  67         obd_transno_commit_cb(obd, transno, error);
  68 }
  69
  70
  71 /* Assumes caller has already pushed us into the kernel context. */
  72 int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
  73                           int rc)
  74 {
  75         struct filter_obd *filter = &exp->exp_obd->u.filter;
  76         struct filter_export_data *fed = &exp->exp_filter_data;
  77         struct filter_client_data *fcd = fed->fed_fcd;
  78         __u64 last_rcvd;
  79         loff_t off;
  80         int err, log_pri = D_HA;
  81
  82         /* Propagate error code. */
  83         if (rc)
  84                 RETURN(rc);
  85
  86         if (!exp->exp_obd->obd_replayable || oti == NULL)
  87                 RETURN(rc);
  88
  89         /* we don't allocate new transnos for replayed requests */
  90         if (oti->oti_transno == 0) {
  91                 spin_lock(&filter->fo_translock);
  92                 last_rcvd = le64_to_cpu(filter->fo_fsd->fsd_last_transno) + 1;
  93                 filter->fo_fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
  94                 spin_unlock(&filter->fo_translock);
  95                 oti->oti_transno = last_rcvd;
  96         } else {
  97                 spin_lock(&filter->fo_translock);
  98                 last_rcvd = oti->oti_transno;
  99                 if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno))
 100                         filter->fo_fsd->fsd_last_transno =
 101                                 cpu_to_le64(last_rcvd);
 102                 spin_unlock(&filter->fo_translock);
 103         }
 104         fcd->fcd_last_rcvd = cpu_to_le64(last_rcvd);
 105         fcd->fcd_mount_count = filter->fo_fsd->fsd_mount_count;
 106
 107         /* could get xid from oti, if it's ever needed */
 108         fcd->fcd_last_xid = 0;
 109
 110         off = fed->fed_lr_off;
 111         fsfilt_add_journal_cb(exp->exp_obd, last_rcvd, oti->oti_handle,
 112                               filter_commit_cb, NULL);
 113         err = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp, fcd,
 114                                   sizeof(*fcd), &off, 0);
 115         if (err) {
 116                 log_pri = D_ERROR;
 117                 if (rc == 0)
 118                         rc = err;
 119         }
 120
 121         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
 122                last_rcvd, fcd->fcd_uuid, fed->fed_lr_idx, err);
 123
 124         RETURN(rc);
 125 }
 126
 127 void f_dput(struct dentry *dentry)
 128 {
 129         /* Can't go inside filter_ddelete because it can block */
 130         CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
 131                dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
 132         LASSERT(atomic_read(&dentry->d_count) > 0);
 133
 134         dput(dentry);
 135 }
 136
 137 /* Add client data to the FILTER.  We use a bitmap to locate a free space
 138  * in the last_rcvd file if cl_idx is -1 (i.e. a new client).
 139  * Otherwise, we have just read the data from the last_rcvd file and
 140  * we know its offset. */
 141 static int filter_client_add(struct obd_device *obd, struct filter_obd *filter,
 142                              struct filter_export_data *fed, int cl_idx)
 143 {
 144         unsigned long *bitmap = filter->fo_last_rcvd_slots;
 145         int new_client = (cl_idx == -1);
 146         ENTRY;
 147
 148         LASSERT(bitmap != NULL);
 149
 150         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 151         if (!strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid))
 152                 RETURN(0);
 153
 154         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 155          * there's no need for extra complication here
 156          */
 157         if (new_client) {
 158                 cl_idx = find_first_zero_bit(bitmap, FILTER_LR_MAX_CLIENTS);
 159         repeat:
 160                 if (cl_idx >= FILTER_LR_MAX_CLIENTS) {
 161                         CERROR("no client slots - fix FILTER_LR_MAX_CLIENTS\n");
 162                         RETURN(-ENOMEM);
 163                 }
 164                 if (test_and_set_bit(cl_idx, bitmap)) {
 165                         CERROR("FILTER client %d: found bit is set in bitmap\n",
 166                                cl_idx);
 167                         cl_idx = find_next_zero_bit(bitmap,
 168                                                     FILTER_LR_MAX_CLIENTS,
 169                                                     cl_idx);
 170                         goto repeat;
 171                 }
 172         } else {
 173                 if (test_and_set_bit(cl_idx, bitmap)) {
 174                         CERROR("FILTER client %d: bit already set in bitmap!\n",
 175                                cl_idx);
 176                         LBUG();
 177                 }
 178         }
 179
 180         fed->fed_lr_idx = cl_idx;
 181         fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->fsd_client_start) +
 182                 cl_idx * le16_to_cpu(filter->fo_fsd->fsd_client_size);
 183
 184         CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
 185                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
 186
 187         if (new_client) {
 188                 struct obd_run_ctxt saved;
 189                 loff_t off = fed->fed_lr_off;
 190                 int err;
 191                 void *handle;
 192
 193                 CDEBUG(D_INFO, "writing client fcd at idx %u (%llu) (len %u)\n",
 194                        fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_fcd));
 195
 196                 push_ctxt(&saved, &obd->obd_ctxt, NULL);
 197                 /* Transaction needed to fix bug 1403 */
 198                 handle = fsfilt_start(obd,
 199                                       filter->fo_rcvd_filp->f_dentry->d_inode,
 200                                       FSFILT_OP_SETATTR, NULL);
 201                 if (IS_ERR(handle)) {
 202                         err = PTR_ERR(handle);
 203                         CERROR("unable to start transaction: rc %d\n", err);
 204                 } else {
 205                         err = fsfilt_write_record(obd, filter->fo_rcvd_filp,
 206                                                   fed->fed_fcd,
 207                                                   sizeof(*fed->fed_fcd),
 208                                                   &off, 1);
 209                         fsfilt_commit(obd,
 210                                       filter->fo_rcvd_filp->f_dentry->d_inode,
 211                                       handle, 1);
 212                 }
 213                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 214
 215                 if (err) {
 216                         CERROR("error writing %s client idx %u: rc %d\n",
 217                                LAST_RCVD, fed->fed_lr_idx, err);
 218                         RETURN(err);
 219                 }
 220         }
 221         RETURN(0);
 222 }
 223
 224 static int filter_client_free(struct obd_export *exp, int flags)
 225 {
 226         struct filter_export_data *fed = &exp->exp_filter_data;
 227         struct filter_obd *filter = &exp->exp_obd->u.filter;
 228         struct obd_device *obd = exp->exp_obd;
 229         struct filter_client_data zero_fcd;
 230         struct obd_run_ctxt saved;
 231         int rc;
 232         loff_t off;
 233         ENTRY;
 234
 235         if (fed->fed_fcd == NULL)
 236                 RETURN(0);
 237
 238         if (flags & OBD_OPT_FAILOVER)
 239                 GOTO(free, 0);
 240
 241         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 242         if (strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid ) == 0)
 243                 GOTO(free, 0);
 244
 245         LASSERT(filter->fo_last_rcvd_slots != NULL);
 246
 247         off = fed->fed_lr_off;
 248
 249         CDEBUG(D_INFO, "freeing client at idx %u (%lld) with UUID '%s'\n",
 250                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
 251
 252         if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
 253                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
 254                        fed->fed_lr_idx);
 255                 LBUG();
 256         }
 257
 258         memset(&zero_fcd, 0, sizeof zero_fcd);
 259         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 260         rc = fsfilt_write_record(obd, filter->fo_rcvd_filp, &zero_fcd,
 261                                  sizeof(zero_fcd), &off, 1);
 262         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 263
 264         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 265                "zeroing disconnecting client %s at idx %u (%llu) in %s rc %d\n",
 266                fed->fed_fcd->fcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
 267                LAST_RCVD, rc);
 268
 269 free:
 270         OBD_FREE(fed->fed_fcd, sizeof(*fed->fed_fcd));
 271
 272         RETURN(0);
 273 }
 274
 275 static int filter_free_server_data(struct filter_obd *filter)
 276 {
 277         OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
 278         filter->fo_fsd = NULL;
 279         OBD_FREE(filter->fo_last_rcvd_slots,
 280                  FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long));
 281         filter->fo_last_rcvd_slots = NULL;
 282         return 0;
 283 }
 284
 285 /* assumes caller is already in kernel ctxt */
 286 int filter_update_server_data(struct obd_device *obd, struct file *filp,
 287                               struct filter_server_data *fsd, int force_sync)
 288 {
 289         loff_t off = 0;
 290         int rc;
 291         ENTRY;
 292
 293         CDEBUG(D_INODE, "server uuid      : %s\n", fsd->fsd_uuid);
 294         CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
 295                le64_to_cpu(fsd->fsd_last_transno));
 296         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
 297                le64_to_cpu(fsd->fsd_mount_count));
 298
 299         rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off,force_sync);
 300         if (rc)
 301                 CERROR("error writing filter_server_data: rc = %d\n", rc);
 302
 303         RETURN(rc);
 304 }
 305
 306 int filter_update_last_objid(struct obd_device *obd, obd_gr group,
 307                              int force_sync)
 308 {
 309         struct filter_obd *filter = &obd->u.filter;
 310         __u64 tmp;
 311         loff_t off = 0;
 312         int rc;
 313         ENTRY;
 314
 315         CDEBUG(D_INODE, "server last_objid for group "LPU64": "LPU64"\n",
 316                group, filter->fo_last_objids[group]);
 317
 318         tmp = cpu_to_le64(filter->fo_last_objids[group]);
 319         rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
 320                                  &tmp, sizeof(tmp), &off, force_sync);
 321         if (rc)
 322                 CERROR("error writing group "LPU64" last objid: rc = %d\n",
 323                        group, rc);
 324         RETURN(rc);
 325 }
 326
 327 /* assumes caller has already in kernel ctxt */
 328 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
 329 {
 330         struct filter_obd *filter = &obd->u.filter;
 331         struct filter_server_data *fsd;
 332         struct filter_client_data *fcd = NULL;
 333         struct inode *inode = filp->f_dentry->d_inode;
 334         unsigned long last_rcvd_size = inode->i_size;
 335         __u64 mount_count;
 336         int cl_idx;
 337         loff_t off = 0;
 338         int rc;
 339
 340         /* ensure padding in the struct is the correct size */
 341         LASSERT (offsetof(struct filter_server_data, fsd_padding) +
 342                  sizeof(fsd->fsd_padding) == FILTER_LR_SERVER_SIZE);
 343         LASSERT (offsetof(struct filter_client_data, fcd_padding) +
 344                  sizeof(fcd->fcd_padding) == FILTER_LR_CLIENT_SIZE);
 345
 346         OBD_ALLOC(fsd, sizeof(*fsd));
 347         if (!fsd)
 348                 RETURN(-ENOMEM);
 349         filter->fo_fsd = fsd;
 350
 351         OBD_ALLOC(filter->fo_last_rcvd_slots,
 352                   FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long));
 353         if (filter->fo_last_rcvd_slots == NULL) {
 354                 OBD_FREE(fsd, sizeof(*fsd));
 355                 RETURN(-ENOMEM);
 356         }
 357
 358         if (last_rcvd_size == 0) {
 359                 CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD);
 360
 361                 memcpy(fsd->fsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->fsd_uuid));
 362                 fsd->fsd_last_transno = 0;
 363                 mount_count = fsd->fsd_mount_count = 0;
 364                 fsd->fsd_server_size = cpu_to_le32(FILTER_LR_SERVER_SIZE);
 365                 fsd->fsd_client_start = cpu_to_le32(FILTER_LR_CLIENT_START);
 366                 fsd->fsd_client_size = cpu_to_le16(FILTER_LR_CLIENT_SIZE);
 367                 fsd->fsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
 368                 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
 369         } else {
 370                 rc = fsfilt_read_record(obd, filp, fsd, sizeof(*fsd), &off);
 371                 if (rc) {
 372                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 373                                LAST_RCVD, rc);
 374                         GOTO(err_fsd, rc);
 375                 }
 376                 if (strcmp(fsd->fsd_uuid, obd->obd_uuid.uuid) != 0) {
 377                         CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
 378                                obd->obd_uuid.uuid, fsd->fsd_uuid);
 379                         GOTO(err_fsd, rc = -EINVAL);
 380                 }
 381                 mount_count = le64_to_cpu(fsd->fsd_mount_count);
 382                 filter->fo_subdir_count = le16_to_cpu(fsd->fsd_subdir_count);
 383         }
 384
 385         if (fsd->fsd_feature_incompat & ~le32_to_cpu(FILTER_INCOMPAT_SUPP)) {
 386                 CERROR("unsupported feature %x\n",
 387                        le32_to_cpu(fsd->fsd_feature_incompat) &
 388                        ~FILTER_INCOMPAT_SUPP);
 389                 GOTO(err_fsd, rc = -EINVAL);
 390         }
 391         if (fsd->fsd_feature_rocompat & ~le32_to_cpu(FILTER_ROCOMPAT_SUPP)) {
 392                 CERROR("read-only feature %x\n",
 393                        le32_to_cpu(fsd->fsd_feature_rocompat) &
 394                        ~FILTER_ROCOMPAT_SUPP);
 395                 /* Do something like remount filesystem read-only */
 396                 GOTO(err_fsd, rc = -EINVAL);
 397         }
 398
 399         CDEBUG(D_INODE, "%s: server last_rcvd : "LPU64"\n",
 400                obd->obd_name, le64_to_cpu(fsd->fsd_last_transno));
 401         CDEBUG(D_INODE, "%s: server last_mount: "LPU64"\n",
 402                obd->obd_name, mount_count);
 403         CDEBUG(D_INODE, "%s: server data size: %u\n",
 404                obd->obd_name, le32_to_cpu(fsd->fsd_server_size));
 405         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 406                obd->obd_name, le32_to_cpu(fsd->fsd_client_start));
 407         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 408                obd->obd_name, le32_to_cpu(fsd->fsd_client_size));
 409         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
 410                obd->obd_name, le16_to_cpu(fsd->fsd_subdir_count));
 411         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 412                last_rcvd_size <= FILTER_LR_CLIENT_START ? 0 :
 413                (last_rcvd_size-FILTER_LR_CLIENT_START) /FILTER_LR_CLIENT_SIZE);
 414
 415         if (!obd->obd_replayable) {
 416                 CWARN("%s: recovery support OFF\n", obd->obd_name);
 417                 GOTO(out, rc = 0);
 418         }
 419
 420         for (cl_idx = 0, off = le32_to_cpu(fsd->fsd_client_start);
 421              off < last_rcvd_size; cl_idx++) {
 422                 __u64 last_rcvd;
 423                 int mount_age;
 424
 425                 if (!fcd) {
 426                         OBD_ALLOC(fcd, sizeof(*fcd));
 427                         if (!fcd)
 428                                 GOTO(err_client, rc = -ENOMEM);
 429                 }
 430
 431                 /* Don't assume off is incremented properly by
 432                  * fsfilt_read_record(), in case sizeof(*fcd)
 433                  * isn't the same as fsd->fsd_client_size.  */
 434                 off = le32_to_cpu(fsd->fsd_client_start) +
 435                         cl_idx * le16_to_cpu(fsd->fsd_client_size);
 436                 rc = fsfilt_read_record(obd, filp, fcd, sizeof(*fcd), &off);
 437                 if (rc) {
 438                         CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
 439                                LAST_RCVD, cl_idx, off, rc);
 440                         break; /* read error shouldn't cause startup to fail */
 441                 }
 442
 443                 if (fcd->fcd_uuid[0] == '\0') {
 444                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 445                                cl_idx);
 446                         continue;
 447                 }
 448
 449                 last_rcvd = le64_to_cpu(fcd->fcd_last_rcvd);
 450
 451                 /* These exports are cleaned up by filter_disconnect(), so they
 452                  * need to be set up like real exports as filter_connect() does.
 453                  */
 454                 mount_age = mount_count - le64_to_cpu(fcd->fcd_mount_count);
 455                 if (mount_age < FILTER_MOUNT_RECOV) {
 456                         struct obd_export *exp = class_new_export(obd);
 457                         struct filter_export_data *fed;
 458                         CERROR("RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 459                                " srv lr: "LPU64" mnt: "LPU64" last mount: "
 460                                LPU64"\n", fcd->fcd_uuid, cl_idx,
 461                                last_rcvd, le64_to_cpu(fsd->fsd_last_transno),
 462                                le64_to_cpu(fcd->fcd_mount_count), mount_count);
 463                         if (exp == NULL)
 464                                 GOTO(err_client, rc = -ENOMEM);
 465
 466                         memcpy(&exp->exp_client_uuid.uuid, fcd->fcd_uuid,
 467                                sizeof exp->exp_client_uuid.uuid);
 468                         fed = &exp->exp_filter_data;
 469                         fed->fed_fcd = fcd;
 470                         filter_client_add(obd, filter, fed, cl_idx);
 471                         /* create helper if export init gets more complex */
 472                         spin_lock_init(&fed->fed_lock);
 473
 474                         fcd = NULL;
 475                         obd->obd_recoverable_clients++;
 476                         class_export_put(exp);
 477                 } else {
 478                         CDEBUG(D_INFO, "discarded client %d UUID '%s' count "
 479                                LPU64"\n", cl_idx, fcd->fcd_uuid,
 480                                le64_to_cpu(fcd->fcd_mount_count));
 481                 }
 482
 483                 CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
 484                        cl_idx, last_rcvd);
 485
 486                 if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno))
 487                         filter->fo_fsd->fsd_last_transno=cpu_to_le64(last_rcvd);
 488
 489         }
 490
 491         obd->obd_last_committed = le64_to_cpu(filter->fo_fsd->fsd_last_transno);
 492
 493         if (obd->obd_recoverable_clients) {
 494                 CERROR("RECOVERY: %d recoverable clients, last_rcvd "
 495                        LPU64"\n", obd->obd_recoverable_clients,
 496                        le64_to_cpu(filter->fo_fsd->fsd_last_transno));
 497                 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
 498                 obd->obd_recovering = 1;
 499         }
 500
 501         if (fcd)
 502                 OBD_FREE(fcd, sizeof(*fcd));
 503
 504 out:
 505         fsd->fsd_mount_count = cpu_to_le64(mount_count + 1);
 506
 507         /* save it, so mount count and last_transno is current */
 508         rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
 509
 510         RETURN(rc);
 511
 512 err_client:
 513         class_disconnect_exports(obd, 0);
 514 err_fsd:
 515         filter_free_server_data(filter);
 516         RETURN(rc);
 517 }
 518
 519 static int filter_cleanup_groups(struct obd_device *obd)
 520 {
 521         struct filter_obd *filter = &obd->u.filter;
 522         int i;
 523         ENTRY;
 524
 525         if (filter->fo_dentry_O_groups != NULL &&
 526             filter->fo_last_objids != NULL &&
 527             filter->fo_last_objid_files != NULL) {
 528                 for (i = 0; i < FILTER_GROUPS; i++) {
 529                         struct dentry *dentry = filter->fo_dentry_O_groups[i];
 530                         struct file *filp = filter->fo_last_objid_files[i];
 531                         if (dentry != NULL) {
 532                                 f_dput(dentry);
 533                                 filter->fo_dentry_O_groups[i] = NULL;
 534                         }
 535                         if (filp != NULL) {
 536                                 filp_close(filp, 0);
 537                                 filter->fo_last_objid_files[i] = NULL;
 538                         }
 539                 }
 540         }
 541         if (filter->fo_dentry_O_sub != NULL && filter->fo_subdir_count) {
 542                 for (i = 0; i < filter->fo_subdir_count; i++) {
 543                         struct dentry *dentry = filter->fo_dentry_O_sub[i];
 544                         if (dentry != NULL) {
 545                                 f_dput(dentry);
 546                                 filter->fo_dentry_O_sub[i] = NULL;
 547                         }
 548                 }
 549                 OBD_FREE(filter->fo_dentry_O_sub,
 550                          filter->fo_subdir_count *
 551                          sizeof(*filter->fo_dentry_O_sub));
 552         }
 553         if (filter->fo_dentry_O_groups != NULL)
 554                 OBD_FREE(filter->fo_dentry_O_groups,
 555                          FILTER_GROUPS * sizeof(struct dentry *));
 556         if (filter->fo_last_objids != NULL)
 557                 OBD_FREE(filter->fo_last_objids,
 558                          FILTER_GROUPS * sizeof(__u64));
 559         if (filter->fo_last_objid_files != NULL)
 560                 OBD_FREE(filter->fo_last_objid_files,
 561                          FILTER_GROUPS * sizeof(struct file *));
 562         RETURN(0);
 563 }
 564
 565 /* FIXME: object groups */
 566 static int filter_prep_groups(struct obd_device *obd)
 567 {
 568         struct filter_obd *filter = &obd->u.filter;
 569         struct dentry *dentry, *O_dentry;
 570         struct file *filp;
 571         int i, rc = 0, cleanup_phase = 0;
 572         ENTRY;
 573
 574         O_dentry = simple_mkdir(current->fs->pwd, "O", 0700);
 575         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
 576         if (IS_ERR(O_dentry)) {
 577                 rc = PTR_ERR(O_dentry);
 578                 CERROR("cannot open/create O: rc = %d\n", rc);
 579                 GOTO(cleanup, rc);
 580         }
 581         filter->fo_dentry_O = O_dentry;
 582         cleanup_phase = 1; /* O_dentry */
 583
 584         /* Lookup "R" to tell if we're on an old OST FS and need to convert
 585          * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
 586          * some time post 1.0 when all old-style OSTs have converted along
 587          * with the init_objid hack. */
 588         dentry = ll_lookup_one_len("R", O_dentry, 1);
 589         if (IS_ERR(dentry))
 590                 GOTO(cleanup, rc = PTR_ERR(dentry));
 591         if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
 592                 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
 593                 ENTRY;
 594
 595                 CWARN("converting OST to new object layout\n");
 596                 if (IS_ERR(O0_dentry)) {
 597                         rc = PTR_ERR(O0_dentry);
 598                         CERROR("error looking up O/0: rc %d\n", rc);
 599                         GOTO(cleanup_R, rc);
 600                 }
 601
 602                 if (O0_dentry->d_inode) {
 603                         CERROR("Both O/R and O/0 exist. Fix manually.\n");
 604                         GOTO(cleanup_O0, rc = -EEXIST);
 605                 }
 606
 607                 down(&O_dentry->d_inode->i_sem);
 608                 rc = vfs_rename(O_dentry->d_inode, dentry,
 609                                 O_dentry->d_inode, O0_dentry);
 610                 up(&O_dentry->d_inode->i_sem);
 611
 612                 if (rc) {
 613                         CERROR("error renaming O/R to O/0: rc %d\n", rc);
 614                         GOTO(cleanup_O0, rc);
 615                 }
 616                 filter->fo_fsd->fsd_feature_incompat |=
 617                         cpu_to_le32(FILTER_INCOMPAT_GROUPS);
 618                 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 619                                                filter->fo_fsd, 1);
 620                 GOTO(cleanup_O0, rc);
 621
 622         cleanup_O0:
 623                 dput(O0_dentry);
 624         cleanup_R:
 625                 dput(dentry);
 626                 if (rc)
 627                         GOTO(cleanup, rc);
 628         } else {
 629                 dput(dentry);
 630         }
 631
 632         OBD_ALLOC(filter->fo_last_objids, FILTER_GROUPS * sizeof(__u64));
 633         if (filter->fo_last_objids == NULL)
 634                 GOTO(cleanup, rc = -ENOMEM);
 635         cleanup_phase = 2; /* groups */
 636
 637         OBD_ALLOC(filter->fo_dentry_O_groups, FILTER_GROUPS * sizeof(dentry));
 638         if (filter->fo_dentry_O_groups == NULL)
 639                 GOTO(cleanup, rc = -ENOMEM);
 640         OBD_ALLOC(filter->fo_last_objid_files, FILTER_GROUPS * sizeof(filp));
 641         if (filter->fo_last_objid_files == NULL)
 642                 GOTO(cleanup, rc = -ENOMEM);
 643
 644         for (i = 0; i < FILTER_GROUPS; i++) {
 645                 char name[25];
 646                 loff_t off = 0;
 647
 648                 sprintf(name, "%d", i);
 649                 dentry = simple_mkdir(O_dentry, name, 0700);
 650                 CDEBUG(D_INODE, "got/created O/%s: %p\n", name, dentry);
 651                 if (IS_ERR(dentry)) {
 652                         rc = PTR_ERR(dentry);
 653                         CERROR("cannot lookup/create O/%s: rc = %d\n",
 654                                name, rc);
 655                         GOTO(cleanup, rc);
 656                 }
 657                 filter->fo_dentry_O_groups[i] = dentry;
 658
 659                 sprintf(name, "O/%d/LAST_ID", i);
 660                 filp = filp_open(name, O_CREAT | O_RDWR, 0700);
 661                 if (IS_ERR(dentry)) {
 662                         rc = PTR_ERR(dentry);
 663                         CERROR("cannot create %s: rc = %d\n", name, rc);
 664                         GOTO(cleanup, rc);
 665                 }
 666                 filter->fo_last_objid_files[i] = filp;
 667
 668                 if (filp->f_dentry->d_inode->i_size == 0) {
 669                         if (i == 0 && filter->fo_fsd->fsd_unused != 0) {
 670                                 /* OST conversion, remove sometime post 1.0 */
 671                                 filter->fo_last_objids[i] =
 672                                         le64_to_cpu(filter->fo_fsd->fsd_unused);
 673                                 CWARN("saving old objid "LPU64" to LAST_ID\n",
 674                                       filter->fo_last_objids[i]);
 675                                 rc = filter_update_last_objid(obd, 0, 1);
 676                                 if (rc)
 677                                         GOTO(cleanup, rc);
 678                         } else {
 679                                 filter->fo_last_objids[i] = FILTER_INIT_OBJID;
 680                         }
 681                         continue;
 682                 }
 683
 684                 rc = fsfilt_read_record(obd, filp, &filter->fo_last_objids[i],
 685                                         sizeof(__u64), &off);
 686                 if (rc) {
 687                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 688                                name, rc);
 689                         GOTO(cleanup, rc);
 690                 }
 691                 filter->fo_last_objids[i] =
 692                         le64_to_cpu(filter->fo_last_objids[i]);
 693                 CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
 694                        obd->obd_name, i, filter->fo_last_objids[i]);
 695         }
 696
 697         if (filter->fo_subdir_count) {
 698                 O_dentry = filter->fo_dentry_O_groups[0];
 699                 OBD_ALLOC(filter->fo_dentry_O_sub,
 700                           filter->fo_subdir_count * sizeof(dentry));
 701                 if (filter->fo_dentry_O_sub == NULL)
 702                         GOTO(cleanup, rc = -ENOMEM);
 703
 704                 for (i = 0; i < filter->fo_subdir_count; i++) {
 705                         char dir[20];
 706                         snprintf(dir, sizeof(dir), "d%u", i);
 707
 708                         dentry = simple_mkdir(O_dentry, dir, 0700);
 709                         CDEBUG(D_INODE, "got/created O/0/%s: %p\n", dir,dentry);
 710                         if (IS_ERR(dentry)) {
 711                                 rc = PTR_ERR(dentry);
 712                                 CERROR("can't lookup/create O/0/%s: rc = %d\n",
 713                                        dir, rc);
 714                                 GOTO(cleanup, rc);
 715                         }
 716                         filter->fo_dentry_O_sub[i] = dentry;
 717                 }
 718         }
 719         RETURN(0);
 720
 721  cleanup:
 722         switch (cleanup_phase) {
 723         case 2:
 724                 filter_cleanup_groups(obd);
 725         case 1:
 726                 f_dput(filter->fo_dentry_O);
 727                 filter->fo_dentry_O = NULL;
 728         default:
 729                 break;
 730         }
 731         return rc;
 732 }
 733
 734 /* setup the object store with correct subdirectories */
 735 static int filter_prep(struct obd_device *obd)
 736 {
 737         struct obd_run_ctxt saved;
 738         struct filter_obd *filter = &obd->u.filter;
 739         struct file *file;
 740         struct inode *inode;
 741         int rc = 0;
 742         ENTRY;
 743
 744         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 745         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 746         if (!file || IS_ERR(file)) {
 747                 rc = PTR_ERR(file);
 748                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 749                        LAST_RCVD, rc);
 750                 GOTO(out, rc);
 751         }
 752
 753         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 754                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
 755                        file->f_dentry->d_inode->i_mode);
 756                 GOTO(err_filp, rc = -ENOENT);
 757         }
 758
 759         /* steal operations */
 760         inode = file->f_dentry->d_inode;
 761         filter->fo_fop = file->f_op;
 762         filter->fo_iop = inode->i_op;
 763         filter->fo_aops = inode->i_mapping->a_ops;
 764
 765         rc = filter_init_server_data(obd, file);
 766         if (rc) {
 767                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
 768                 GOTO(err_filp, rc);
 769         }
 770         filter->fo_rcvd_filp = file;
 771
 772         rc = filter_prep_groups(obd);
 773         if (rc)
 774                 GOTO(err_server_data, rc);
 775
 776  out:
 777         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 778
 779         return(rc);
 780
 781  err_server_data:
 782         //class_disconnect_exports(obd, 0);
 783         filter_free_server_data(filter);
 784  err_filp:
 785         if (filp_close(file, 0))
 786                 CERROR("can't close %s after error\n", LAST_RCVD);
 787         filter->fo_rcvd_filp = NULL;
 788         goto out;
 789 }
 790
 791 /* cleanup the filter: write last used object id to status file */
 792 static void filter_post(struct obd_device *obd)
 793 {
 794         struct obd_run_ctxt saved;
 795         struct filter_obd *filter = &obd->u.filter;
 796         int rc, i;
 797
 798         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
 799          * best to start a transaction with h_sync, because we removed this
 800          * from lastobjid */
 801
 802         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 803         rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 804                                        filter->fo_fsd, 0);
 805         if (rc)
 806                 CERROR("error writing server data: rc = %d\n", rc);
 807
 808         for (i = 0; i < FILTER_GROUPS; i++) {
 809                 rc = filter_update_last_objid(obd, i, (i == FILTER_GROUPS - 1));
 810                 if (rc)
 811                         CERROR("error writing group %d lastobjid: rc = %d\n",
 812                                i, rc);
 813         }
 814
 815         filp_close(filter->fo_rcvd_filp, 0);
 816         filter->fo_rcvd_filp = NULL;
 817         if (rc)
 818                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
 819
 820         filter_cleanup_groups(obd);
 821         f_dput(filter->fo_dentry_O);
 822         filter_free_server_data(filter);
 823         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 824 }
 825
 826 static void filter_set_last_id(struct filter_obd *filter, struct obdo *oa,
 827                                obd_id id)
 828 {
 829         obd_gr group = 0;
 830         LASSERT(filter->fo_fsd != NULL);
 831
 832         if (oa != NULL) {
 833                 LASSERT(oa->o_gr <= FILTER_GROUPS);
 834                 group = oa->o_gr;
 835         }
 836
 837         spin_lock(&filter->fo_objidlock);
 838         filter->fo_last_objids[group] = id;
 839         spin_unlock(&filter->fo_objidlock);
 840 }
 841
 842 __u64 filter_last_id(struct filter_obd *filter, struct obdo *oa)
 843 {
 844         obd_id id;
 845         obd_gr group = 0;
 846         LASSERT(filter->fo_fsd != NULL);
 847
 848         if (oa != NULL) {
 849                 LASSERT(oa->o_gr <= FILTER_GROUPS);
 850                 group = oa->o_gr;
 851         }
 852
 853         /* FIXME: object groups */
 854         spin_lock(&filter->fo_objidlock);
 855         id = filter->fo_last_objids[group];
 856         spin_unlock(&filter->fo_objidlock);
 857
 858         return id;
 859 }
 860
 861 /* direct cut-n-paste of mds_blocking_ast() */
 862 static int filter_blocking_ast(struct ldlm_lock *lock,
 863                                struct ldlm_lock_desc *desc,
 864                                void *data, int flag)
 865 {
 866         int do_ast;
 867         ENTRY;
 868
 869         if (flag == LDLM_CB_CANCELING) {
 870                 /* Don't need to do anything here. */
 871                 RETURN(0);
 872         }
 873
 874         /* XXX layering violation!  -phil */
 875         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 876         /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
 877          * such that filter_blocking_ast is called just before l_i_p takes the
 878          * ns_lock, then by the time we get the lock, we might not be the
 879          * correct blocking function anymore.  So check, and return early, if
 880          * so. */
 881         if (lock->l_blocking_ast != filter_blocking_ast) {
 882                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 883                 RETURN(0);
 884         }
 885
 886         lock->l_flags |= LDLM_FL_CBPENDING;
 887         do_ast = (!lock->l_readers && !lock->l_writers);
 888         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 889
 890         if (do_ast) {
 891                 struct lustre_handle lockh;
 892                 int rc;
 893
 894                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 895                 ldlm_lock2handle(lock, &lockh);
 896                 rc = ldlm_cli_cancel(&lockh);
 897                 if (rc < 0)
 898                         CERROR("ldlm_cli_cancel: %d\n", rc);
 899         } else {
 900                 LDLM_DEBUG(lock, "Lock still has references, will be "
 901                            "cancelled later");
 902         }
 903         RETURN(0);
 904 }
 905
 906 static int filter_lock_dentry(struct obd_device *obd, struct dentry *de,
 907                               ldlm_mode_t lock_mode,struct lustre_handle *lockh)
 908 {
 909         struct ldlm_res_id res_id = { .name = {0} };
 910         int flags = 0, rc;
 911         ENTRY;
 912
 913         res_id.name[0] = de->d_inode->i_ino;
 914         res_id.name[1] = de->d_inode->i_generation;
 915         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 916                               res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 917                               &flags, ldlm_completion_ast,
 918                               filter_blocking_ast, NULL, lockh);
 919
 920         RETURN(rc == ELDLM_OK ? 0 : -EIO);  /* XXX translate ldlm code */
 921 }
 922
 923 /* We never dget the object parent, so DON'T dput it either */
 924 static void filter_parent_unlock(struct dentry *dparent,
 925                                  struct lustre_handle *lockh,
 926                                  ldlm_mode_t lock_mode)
 927 {
 928         ldlm_lock_decref(lockh, lock_mode);
 929 }
 930
 931 /* We never dget the object parent, so DON'T dput it either */
 932 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
 933 {
 934         struct filter_obd *filter = &obd->u.filter;
 935         LASSERT(group < FILTER_GROUPS); /* FIXME: object groups */
 936
 937         if (group > 0 || filter->fo_subdir_count == 0)
 938                 return filter->fo_dentry_O_groups[group];
 939
 940         return filter->fo_dentry_O_sub[objid & (filter->fo_subdir_count - 1)];
 941 }
 942
 943 /* We never dget the object parent, so DON'T dput it either */
 944 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
 945                                   obd_id objid, ldlm_mode_t lock_mode,
 946                                   struct lustre_handle *lockh)
 947 {
 948         unsigned long now = jiffies;
 949         struct dentry *de = filter_parent(obd, group, objid);
 950         int rc;
 951
 952         if (IS_ERR(de))
 953                 return de;
 954
 955         rc = filter_lock_dentry(obd, de, lock_mode, lockh);
 956         if (time_after(jiffies, now + 15 * HZ))
 957                 CERROR("slow parent lock %lus\n", (jiffies - now) / HZ);
 958         return rc ? ERR_PTR(rc) : de;
 959 }
 960
 961 /* How to get files, dentries, inodes from object id's.
 962  *
 963  * If dir_dentry is passed, the caller has already locked the parent
 964  * appropriately for this operation (normally a write lock).  If
 965  * dir_dentry is NULL, we do a read lock while we do the lookup to
 966  * avoid races with create/destroy and such changing the directory
 967  * internal to the filesystem code. */
 968 struct dentry *filter_fid2dentry(struct obd_device *obd,
 969                                  struct dentry *dir_dentry,
 970                                  obd_gr group, obd_id id)
 971 {
 972         struct lustre_handle lockh;
 973         struct dentry *dparent = dir_dentry;
 974         struct dentry *dchild;
 975         char name[32];
 976         int len;
 977         ENTRY;
 978
 979         if (id == 0) {
 980                 CERROR("fatal: invalid object id 0\n");
 981                 RETURN(ERR_PTR(-ESTALE));
 982         }
 983
 984         len = sprintf(name, LPU64, id);
 985         if (dir_dentry == NULL) {
 986                 dparent = filter_parent_lock(obd, group, id, LCK_PR, &lockh);
 987                 if (IS_ERR(dparent))
 988                         RETURN(dparent);
 989         }
 990         CDEBUG(D_INODE, "looking up object O/%*s/%s\n",
 991                dparent->d_name.len, dparent->d_name.name, name);
 992         dchild = ll_lookup_one_len(name, dparent, len);
 993         if (dir_dentry == NULL)
 994                 filter_parent_unlock(dparent, &lockh, LCK_PR);
 995         if (IS_ERR(dchild)) {
 996                 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
 997                 RETURN(dchild);
 998         }
 999
1000         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1001                name, dchild, atomic_read(&dchild->d_count));
1002
1003         LASSERT(atomic_read(&dchild->d_count) > 0);
1004
1005         RETURN(dchild);
1006 }
1007
1008 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid)
1009 {
1010         struct lustre_handle lockh;
1011         int flags = LDLM_AST_DISCARD_DATA, rc;
1012         struct ldlm_res_id res_id = { .name = { objid } };
1013         struct ldlm_extent extent = { 0, OBD_OBJECT_EOF };
1014         ENTRY;
1015
1016         /* Tell the clients that the object is gone now and that they should
1017          * throw away any cached pages.  If we're the OST at stripe 0 in the
1018          * file then this enqueue will communicate the DISCARD to all the
1019          * clients.  This assumes that we always destroy all the objects for
1020          * a file at a time, as is currently the case.  If we're not the
1021          * OST at stripe 0 then we'll harmlessly get a very lonely lock in
1022          * the local DLM and immediately drop it. */
1023         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
1024                               res_id, LDLM_EXTENT, &extent,
1025                               sizeof(extent), LCK_PW, &flags,
1026                               ldlm_completion_ast, filter_blocking_ast,
1027                               NULL, &lockh);
1028
1029         /* We only care about the side-effects, just drop the lock. */
1030         if (rc == ELDLM_OK)
1031                 ldlm_lock_decref(&lockh, LCK_PW);
1032
1033         RETURN(rc);
1034 }
1035
1036 /* Caller must hold LCK_PW on parent and push us into kernel context.
1037  * Caller is also required to ensure that dchild->d_inode exists. */
1038 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1039                                    struct dentry *dparent,
1040                                    struct dentry *dchild)
1041 {
1042         struct inode *inode = dchild->d_inode;
1043         int rc;
1044         ENTRY;
1045
1046         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1047                 CERROR("destroying objid %*s nlink = %lu, count = %d\n",
1048                        dchild->d_name.len, dchild->d_name.name,
1049                        (unsigned long)inode->i_nlink,
1050                        atomic_read(&inode->i_count));
1051         }
1052
1053         rc = vfs_unlink(dparent->d_inode, dchild);
1054
1055         if (rc)
1056                 CERROR("error unlinking objid %*s: rc %d\n",
1057                        dchild->d_name.len, dchild->d_name.name, rc);
1058
1059         RETURN(rc);
1060 }
1061
1062 /* mount the file system (secretly) */
1063 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1064                         char *option)
1065 {
1066         struct lustre_cfg* lcfg = buf;
1067         struct filter_obd *filter = &obd->u.filter;
1068         struct vfsmount *mnt;
1069         int rc = 0;
1070         ENTRY;
1071
1072         dev_clear_rdonly(2);
1073
1074         if (!lcfg->lcfg_inlbuf1 || !lcfg->lcfg_inlbuf2)
1075                 RETURN(-EINVAL);
1076
1077         obd->obd_fsops = fsfilt_get_ops(lcfg->lcfg_inlbuf2);
1078         if (IS_ERR(obd->obd_fsops))
1079                 RETURN(PTR_ERR(obd->obd_fsops));
1080
1081         mnt = do_kern_mount(lcfg->lcfg_inlbuf2, MS_NOATIME | MS_NODIRATIME,
1082                             lcfg->lcfg_inlbuf1, option);
1083         rc = PTR_ERR(mnt);
1084         if (IS_ERR(mnt))
1085                 GOTO(err_ops, rc);
1086
1087         if (lcfg->lcfg_inllen3 > 0 && lcfg->lcfg_inlbuf3) {
1088                 if (*lcfg->lcfg_inlbuf3 == 'f') {
1089                         obd->obd_replayable = 1;
1090                         obd_sync_filter = 1;
1091                         CERROR("%s: recovery enabled\n", obd->obd_name);
1092                 } else {
1093                         if (*lcfg->lcfg_inlbuf3 != 'n') {
1094                                 CERROR("unrecognised flag '%c'\n",
1095                                        *lcfg->lcfg_inlbuf3);
1096                         }
1097                         // XXX Robert? Why do we get errors here
1098                         // GOTO(err_mntput, rc = -EINVAL);
1099                 }
1100         }
1101
1102         filter->fo_vfsmnt = mnt;
1103         filter->fo_sb = mnt->mnt_sb;
1104         filter->fo_fstype = mnt->mnt_sb->s_type->name;
1105         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1106
1107         OBD_SET_CTXT_MAGIC(&obd->obd_ctxt);
1108         obd->obd_ctxt.pwdmnt = mnt;
1109         obd->obd_ctxt.pwd = mnt->mnt_root;
1110         obd->obd_ctxt.fs = get_ds();
1111         obd->obd_ctxt.cb_ops = filter_lvfs_ops;
1112
1113         rc = filter_prep(obd);
1114         if (rc)
1115                 GOTO(err_mntput, rc);
1116
1117         spin_lock_init(&filter->fo_translock);
1118         spin_lock_init(&filter->fo_objidlock);
1119         INIT_LIST_HEAD(&filter->fo_export_list);
1120         sema_init(&filter->fo_alloc_lock, 1);
1121
1122         obd->obd_namespace = ldlm_namespace_new("filter-tgt",
1123                                                 LDLM_NAMESPACE_SERVER);
1124         if (obd->obd_namespace == NULL)
1125                 GOTO(err_post, rc = -ENOMEM);
1126
1127         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1128                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1129
1130         RETURN(0);
1131
1132 err_post:
1133         filter_post(obd);
1134 err_mntput:
1135         unlock_kernel();
1136         mntput(mnt);
1137         filter->fo_sb = 0;
1138         lock_kernel();
1139 err_ops:
1140         fsfilt_put_ops(obd->obd_fsops);
1141         return rc;
1142 }
1143
1144 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1145 {
1146         struct lustre_cfg* lcfg = buf;
1147         const char *str = NULL;
1148         char *option = NULL;
1149         int n = 0;
1150         int rc;
1151
1152         if (!strcmp(lcfg->lcfg_inlbuf2, "ext3")) {
1153 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1154         /* bug 1577: implement async-delete for 2.5 */
1155                 str = "errors=remount-ro,asyncdel";
1156 #else
1157                 str = "errors=remount-ro";
1158 #endif
1159                 n = strlen(str) + 1;
1160                 OBD_ALLOC(option, n);
1161                 if (option == NULL)
1162                         RETURN(-ENOMEM);
1163                 strcpy(option, str);
1164         }
1165
1166         rc = filter_common_setup(obd, len, buf, option);
1167         if (option)
1168                 OBD_FREE(option, n);
1169         return rc;
1170 }
1171
1172 static int filter_postsetup(struct obd_device *obd)
1173 {
1174         int rc = 0;
1175         ENTRY;
1176
1177         // XXX add a storage location for the logid for size changes
1178 #ifdef ENABLE_ORPHANS
1179         rc = llog_cat_initialize(obd, 1);
1180         if (rc)
1181                 CERROR("failed to setup llogging subsystems\n");
1182 #endif
1183         RETURN(rc);
1184 }
1185
1186 static int filter_cleanup(struct obd_device *obd, int flags)
1187 {
1188         struct filter_obd *filter = &obd->u.filter;
1189         ENTRY;
1190
1191         if (flags & OBD_OPT_FAILOVER)
1192                 CERROR("%s: shutting down for failover; client state will"
1193                        " be preserved.\n", obd->obd_name);
1194
1195         if (!list_empty(&obd->obd_exports)) {
1196                 CERROR("%s: still has clients!\n", obd->obd_name);
1197                 class_disconnect_exports(obd, flags);
1198                 if (!list_empty(&obd->obd_exports)) {
1199                         CERROR("still has exports after forced cleanup?\n");
1200                         RETURN(-EBUSY);
1201                 }
1202         }
1203
1204         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1205
1206         if (filter->fo_sb == NULL)
1207                 RETURN(0);
1208
1209         filter_post(obd);
1210
1211         shrink_dcache_parent(filter->fo_sb->s_root);
1212         filter->fo_sb = 0;
1213
1214         if (atomic_read(&filter->fo_vfsmnt->mnt_count) > 1)
1215                 CERROR("%s: mount point %p busy, mnt_count: %d\n",
1216                        obd->obd_name, filter->fo_vfsmnt,
1217                        atomic_read(&filter->fo_vfsmnt->mnt_count));
1218
1219         unlock_kernel();
1220         mntput(filter->fo_vfsmnt);
1221         //destroy_buffers(filter->fo_sb->s_dev);
1222         filter->fo_sb = NULL;
1223         fsfilt_put_ops(obd->obd_fsops);
1224         lock_kernel();
1225
1226         dev_clear_rdonly(2);
1227
1228         RETURN(0);
1229 }
1230
1231 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1232 {
1233         struct lprocfs_static_vars lvars;
1234         int rc;
1235
1236         lprocfs_init_vars(filter, &lvars);
1237         rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1238         if (rc != 0)
1239                 return rc;
1240
1241         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1242         if (rc != 0)
1243                 return rc;
1244
1245         /* Init obdfilter private stats here */
1246         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1247                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1248         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1249                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1250         return rc;
1251 }
1252
1253 static int filter_detach(struct obd_device *dev)
1254 {
1255         lprocfs_free_obd_stats(dev);
1256         return lprocfs_obd_detach(dev);
1257 }
1258
1259 /* nearly identical to mds_connect */
1260 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1261                           struct obd_uuid *cluuid)
1262 {
1263         struct obd_export *exp;
1264         struct filter_export_data *fed;
1265         struct filter_client_data *fcd = NULL;
1266         struct filter_obd *filter = &obd->u.filter;
1267         int rc;
1268         ENTRY;
1269
1270         if (conn == NULL || obd == NULL || cluuid == NULL)
1271                 RETURN(-EINVAL);
1272
1273         rc = class_connect(conn, obd, cluuid);
1274         if (rc)
1275                 RETURN(rc);
1276         exp = class_conn2export(conn);
1277         LASSERT(exp != NULL);
1278
1279         fed = &exp->exp_filter_data;
1280
1281         spin_lock_init(&fed->fed_lock);
1282
1283         if (!obd->obd_replayable)
1284                 GOTO(cleanup, rc = 0);
1285
1286         OBD_ALLOC(fcd, sizeof(*fcd));
1287         if (!fcd) {
1288                 CERROR("filter: out of memory for client data\n");
1289                 GOTO(cleanup, rc = -ENOMEM);
1290         }
1291
1292         memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1293         fed->fed_fcd = fcd;
1294         fcd->fcd_mount_count = cpu_to_le64(filter->fo_fsd->fsd_mount_count);
1295
1296         rc = filter_client_add(obd, filter, fed, -1);
1297
1298 cleanup:
1299         if (rc) {
1300                 if (fcd)
1301                         OBD_FREE(fcd, sizeof(*fcd));
1302                 class_disconnect(exp, 0);
1303         } else {
1304                 class_export_put(exp);
1305         }
1306         return rc;
1307 }
1308
1309 static int filter_precleanup(struct obd_device *obd, int flags)
1310 {
1311         int rc = 0;
1312         ENTRY;
1313
1314 #ifdef ENABLE_ORPHANS
1315         rc = obd_llog_finish(obd, 0);
1316         if (rc)
1317                 CERROR("failed to cleanup llogging subsystem\n");
1318 #endif
1319
1320         RETURN(rc);
1321 }
1322
1323 static int filter_destroy_export(struct obd_export *exp)
1324 {
1325         ENTRY;
1326
1327         target_destroy_export(exp);
1328
1329         if (exp->exp_obd->obd_replayable)
1330                 filter_client_free(exp, exp->exp_flags);
1331         RETURN(0);
1332 }
1333
1334 /* also incredibly similar to mds_disconnect */
1335 static int filter_disconnect(struct obd_export *exp, int flags)
1336 {
1337         unsigned long irqflags;
1338         struct llog_ctxt *ctxt;
1339         int rc;
1340         ENTRY;
1341
1342         LASSERT(exp);
1343         ldlm_cancel_locks_for_export(exp);
1344
1345         spin_lock_irqsave(&exp->exp_lock, irqflags);
1346         exp->exp_flags = flags;
1347         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
1348
1349         fsfilt_sync(exp->exp_obd, exp->exp_obd->u.filter.fo_sb);
1350         /* XXX cleanup preallocated inodes */
1351
1352         /* flush any remaining cancel messages out to the target */
1353         ctxt = llog_get_context(exp->exp_obd, LLOG_UNLINK_REPL_CTXT);
1354         llog_sync(ctxt, exp);
1355
1356         rc = class_disconnect(exp, flags);
1357         RETURN(rc);
1358 }
1359
1360 struct dentry *__filter_oa2dentry(struct obd_device *obd,
1361                                   struct obdo *oa, const char *what)
1362 {
1363         struct dentry *dchild = NULL;
1364         obd_gr group = 0;
1365
1366         if (oa->o_valid & OBD_MD_FLGROUP)
1367                 group = oa->o_gr;
1368
1369         dchild = filter_fid2dentry(obd, NULL, group, oa->o_id);
1370
1371         if (IS_ERR(dchild)) {
1372                 CERROR("%s error looking up object: "LPU64"\n", what, oa->o_id);
1373                 RETURN(dchild);
1374         }
1375
1376         if (dchild->d_inode == NULL) {
1377                 CERROR("%s on non-existent object: "LPU64"\n", what, oa->o_id);
1378                 f_dput(dchild);
1379                 RETURN(ERR_PTR(-ENOENT));
1380         }
1381
1382         return dchild;
1383 }
1384
1385 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
1386                           struct lov_stripe_md *md)
1387 {
1388         struct dentry *dentry = NULL;
1389         struct obd_device *obd;
1390         int rc = 0;
1391         ENTRY;
1392
1393         obd = class_exp2obd(exp);
1394         if (obd == NULL) {
1395                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1396                        exp->exp_handle.h_cookie);
1397                 RETURN(-EINVAL);
1398         }
1399
1400         dentry = filter_oa2dentry(obd, oa);
1401         if (IS_ERR(dentry))
1402                 RETURN(PTR_ERR(dentry));
1403
1404         /* Limit the valid bits in the return data to what we actually use */
1405         oa->o_valid = OBD_MD_FLID;
1406         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1407
1408         f_dput(dentry);
1409         RETURN(rc);
1410 }
1411
1412 /* this is called from filter_truncate() until we have filter_punch() */
1413 static int filter_setattr(struct obd_export *exp, struct obdo *oa,
1414                           struct lov_stripe_md *md, struct obd_trans_info *oti)
1415 {
1416         struct obd_run_ctxt saved;
1417         struct filter_obd *filter;
1418         struct dentry *dentry;
1419         struct iattr iattr;
1420         void *handle;
1421         int rc, rc2;
1422         ENTRY;
1423
1424         LASSERT(oti != NULL);
1425
1426         dentry = filter_oa2dentry(exp->exp_obd, oa);
1427         if (IS_ERR(dentry))
1428                 RETURN(PTR_ERR(dentry));
1429
1430         filter = &exp->exp_obd->u.filter;
1431
1432         iattr_from_obdo(&iattr, oa, oa->o_valid);
1433
1434         push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1435         lock_kernel();
1436
1437         if (iattr.ia_valid & ATTR_SIZE)
1438                 down(&dentry->d_inode->i_sem);
1439         handle = fsfilt_start(exp->exp_obd, dentry->d_inode, FSFILT_OP_SETATTR,
1440                               oti);
1441         if (IS_ERR(handle))
1442                 GOTO(out_unlock, rc = PTR_ERR(handle));
1443
1444         /* XXX this could be a rwsem instead, if filter_preprw played along */
1445         if (iattr.ia_valid & ATTR_ATTR_FLAG)
1446                 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode, NULL,
1447                                       EXT3_IOC_SETFLAGS,
1448                                       (long)&iattr.ia_attr_flags);
1449         else
1450                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1);
1451         rc = filter_finish_transno(exp, oti, rc);
1452         rc2 = fsfilt_commit(exp->exp_obd, dentry->d_inode, handle, 0);
1453         if (rc2) {
1454                 CERROR("error on commit, err = %d\n", rc2);
1455                 if (!rc)
1456                         rc = rc2;
1457         }
1458
1459         oa->o_valid = OBD_MD_FLID;
1460         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1461
1462 out_unlock:
1463         if (iattr.ia_valid & ATTR_SIZE)
1464                 up(&dentry->d_inode->i_sem);
1465         unlock_kernel();
1466         pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1467
1468         f_dput(dentry);
1469         RETURN(rc);
1470 }
1471
1472 /* XXX identical to osc_unpackmd */
1473 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
1474                            struct lov_mds_md *lmm, int lmm_bytes)
1475 {
1476         int lsm_size;
1477         ENTRY;
1478
1479         if (lmm != NULL) {
1480                 if (lmm_bytes < sizeof (*lmm)) {
1481                         CERROR("lov_mds_md too small: %d, need %d\n",
1482                                lmm_bytes, (int)sizeof(*lmm));
1483                         RETURN(-EINVAL);
1484                 }
1485                 /* XXX LOV_MAGIC etc check? */
1486
1487                 if (lmm->lmm_object_id == cpu_to_le64(0)) {
1488                         CERROR("lov_mds_md: zero lmm_object_id\n");
1489                         RETURN(-EINVAL);
1490                 }
1491         }
1492
1493         lsm_size = lov_stripe_md_size(1);
1494         if (lsmp == NULL)
1495                 RETURN(lsm_size);
1496
1497         if (*lsmp != NULL && lmm == NULL) {
1498                 OBD_FREE(*lsmp, lsm_size);
1499                 *lsmp = NULL;
1500                 RETURN(0);
1501         }
1502
1503         if (*lsmp == NULL) {
1504                 OBD_ALLOC(*lsmp, lsm_size);
1505                 if (*lsmp == NULL)
1506                         RETURN(-ENOMEM);
1507
1508                 loi_init((*lsmp)->lsm_oinfo);
1509         }
1510
1511         if (lmm != NULL) {
1512                 /* XXX zero *lsmp? */
1513                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
1514                 LASSERT((*lsmp)->lsm_object_id);
1515         }
1516
1517         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
1518
1519         RETURN(lsm_size);
1520 }
1521
1522 static void filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
1523                                       struct filter_obd *filter)
1524 {
1525         struct obdo doa; /* XXX obdo on stack */
1526         __u64 last, id;
1527         ENTRY;
1528         LASSERT(oa);
1529
1530         memset(&doa, 0, sizeof(doa));
1531         if (oa->o_valid & OBD_MD_FLGROUP)
1532                 doa.o_gr = oa->o_gr;
1533         else
1534                 doa.o_gr = 0;
1535         doa.o_mode = S_IFREG;
1536         last = filter_last_id(filter, &doa); /* FIXME: object groups */
1537         CWARN("deleting orphan objects from "LPU64" to "LPU64"\n",
1538                oa->o_id + 1, last);
1539         for (id = oa->o_id + 1; id <= last; id++) {
1540                 doa.o_id = id;
1541                 filter_destroy(exp, &doa, NULL, NULL);
1542         }
1543         spin_lock(&filter->fo_objidlock);
1544         filter->fo_last_objids[0] = oa->o_id; /* FIXME: object groups */
1545         spin_unlock(&filter->fo_objidlock);
1546         EXIT;
1547 }
1548
1549 /* returns a negative error or a nonnegative number of files to create */
1550 static int filter_should_precreate(struct obd_export *exp, struct obdo *oa,
1551                                    int group)
1552 {
1553         struct obd_device *obd = exp->exp_obd;
1554         struct filter_obd *filter = &obd->u.filter;
1555         int diff, rc;
1556         ENTRY;
1557
1558         diff = oa->o_id - filter_last_id(filter, oa);
1559         CDEBUG(D_INFO, "filter_last_id() = "LPU64" -> diff = %d\n",
1560                filter_last_id(filter, oa), diff);
1561
1562         /* delete orphans request */
1563         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
1564             (oa->o_flags & OBD_FL_DELORPHAN)) {
1565                 LASSERT(diff <= 0);
1566                 if (diff == 0)
1567                         RETURN(0);
1568                 filter_destroy_precreated(exp, oa, filter);
1569                 rc = filter_update_last_objid(obd, group, 0);
1570                 if (rc)
1571                         CERROR("unable to write lastobjid, but orphans"
1572                                "were deleted\n");
1573                 RETURN(0);
1574         } else {
1575                 /* only precreate if group == 0 and o_id is specfied */
1576                 if (!(oa->o_valid & OBD_FL_DELORPHAN) &&
1577                     (group != 0 || oa->o_id == 0))
1578                         RETURN(1);
1579
1580                 LASSERT(diff >= 0);
1581                 RETURN(diff);
1582         }
1583
1584 }
1585
1586 /* We rely on the fact that only one thread will be creating files in a given
1587  * group at a time, which is why we don't need an atomic filter_get_new_id.
1588  * Even if we had that atomic function, the following race would exist:
1589  *
1590  * thread 1: gets id x from filter_next_id
1591  * thread 2: gets id (x + 1) from filter_next_id
1592  * thread 2: creates object (x + 1)
1593  * thread 1: tries to create object x, gets -ENOSPC
1594  */
1595 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
1596                             obd_gr group, int *num)
1597 {
1598         struct lustre_handle parent_lockh;
1599         struct dentry *dchild = NULL;
1600         struct filter_obd *filter;
1601         struct dentry *dparent;
1602         int err = 0, rc = 0, i;
1603         __u64 next_id;
1604         void *handle;
1605         ENTRY;
1606
1607         filter = &obd->u.filter;
1608
1609         for (i = 0; i < *num && err == 0; i++) {
1610                 int cleanup_phase = 0;
1611
1612                 next_id = filter_last_id(filter, oa) + 1;
1613                 CDEBUG(D_INFO, "precreate objid "LPU64"\n", next_id);
1614
1615                 dparent = filter_parent_lock(obd, group, next_id, LCK_PW,
1616                                              &parent_lockh);
1617                 if (IS_ERR(dparent))
1618                         GOTO(cleanup,  PTR_ERR(dparent));
1619                 cleanup_phase = 1;
1620
1621                 dchild = filter_fid2dentry(obd, dparent, group, next_id);
1622                 if (IS_ERR(dchild))
1623                         GOTO(cleanup, rc = PTR_ERR(dchild));
1624                 cleanup_phase = 2;
1625
1626                 if (dchild->d_inode != NULL) {
1627                         /* This would only happen if lastobjid was bad on disk*/
1628                         CERROR("Serious error: objid %*s already exists; is "
1629                                "this filesystem corrupt?\n",
1630                                dchild->d_name.len, dchild->d_name.name);
1631                         GOTO(cleanup, rc = -EEXIST);
1632                 }
1633
1634                 handle = fsfilt_start(obd, dparent->d_inode,
1635                                       FSFILT_OP_CREATE_LOG, NULL);
1636                 if (IS_ERR(handle))
1637                         GOTO(cleanup, rc = PTR_ERR(handle));
1638                 cleanup_phase = 3;
1639
1640                 rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
1641                 if (rc) {
1642                         CERROR("create failed rc = %d\n", rc);
1643                         GOTO(cleanup, rc);
1644                 }
1645
1646                 filter_set_last_id(filter, oa, next_id);
1647                 err = filter_update_last_objid(obd, group, 0);
1648                 if (err)
1649                         CERROR("unable to write lastobjid but file created\n");
1650
1651         cleanup:
1652                 switch(cleanup_phase) {
1653                 case 3:
1654                         err = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1655                         if (err) {
1656                                 CERROR("error on commit, err = %d\n", err);
1657                                 if (!rc)
1658                                         rc = err;
1659                         }
1660                 case 2:
1661                         f_dput(dchild);
1662                 case 1:
1663                         filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1664                 case 0:
1665                 }
1666
1667                 if (rc)
1668                         break;
1669         }
1670         *num = i;
1671
1672         CDEBUG(D_INFO, "filter_precreate() created %d objects\n", i);
1673         RETURN(rc);
1674 }
1675
1676 static int filter_create(struct obd_export *exp, struct obdo *oa,
1677                          struct lov_stripe_md **ea, struct obd_trans_info *oti)
1678 {
1679         struct obd_device *obd = NULL;
1680         struct obd_run_ctxt saved;
1681         struct lov_stripe_md *lsm = NULL;
1682         obd_gr group = 0;
1683         int rc = 0, diff;
1684         ENTRY;
1685
1686         if (oa->o_valid & OBD_MD_FLGROUP)
1687                 group = oa->o_gr;
1688
1689         CDEBUG(D_INFO, "filter_create(od->o_gr="LPU64",od->o_id="LPU64")\n",
1690                group, oa->o_id);
1691         if (ea != NULL) {
1692                 lsm = *ea;
1693                 if (lsm == NULL) {
1694                         rc = obd_alloc_memmd(exp, &lsm);
1695                         if (rc < 0)
1696                                 RETURN(rc);
1697                 }
1698         }
1699
1700         obd = exp->exp_obd;
1701         push_ctxt(&saved, &obd->obd_ctxt, NULL);
1702
1703         diff = filter_should_precreate(exp, oa, group);
1704         if (diff > 0) {
1705                 oa->o_id = filter_last_id(&obd->u.filter, oa);
1706                 rc = filter_precreate(obd, oa, group, &diff);
1707                 oa->o_id += diff;
1708                 oa->o_valid = OBD_MD_FLID;
1709         }
1710
1711         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1712         if (rc && ea != NULL && *ea != lsm) {
1713                 obd_free_memmd(exp, &lsm);
1714         } else if (rc == 0 && ea != NULL) {
1715                 /* XXX LOV STACKING: the lsm that is passed to us from
1716                  * LOV does not have valid lsm_oinfo data structs, so
1717                  * don't go touching that.  This needs to be fixed in a
1718                  * big way. */
1719                 lsm->lsm_object_id = oa->o_id;
1720                 *ea = lsm;
1721         }
1722
1723         RETURN(rc);
1724 }
1725
1726 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
1727                           struct lov_stripe_md *ea, struct obd_trans_info *oti)
1728 {
1729         struct obd_device *obd;
1730         struct filter_obd *filter;
1731         struct dentry *dchild = NULL, *dparent = NULL;
1732         struct obd_run_ctxt saved;
1733         void *handle = NULL;
1734         struct lustre_handle parent_lockh;
1735         struct llog_cookie *fcc = NULL;
1736         int rc, rc2, cleanup_phase = 0, have_prepared = 0;
1737         obd_gr group = 0;
1738         ENTRY;
1739
1740         if (oa->o_valid & OBD_MD_FLGROUP)
1741                 group = oa->o_gr;
1742
1743         obd = exp->exp_obd;
1744         filter = &obd->u.filter;
1745
1746         push_ctxt(&saved, &obd->obd_ctxt, NULL);
1747
1748  acquire_locks:
1749         dparent = filter_parent_lock(obd, group, oa->o_id, LCK_PW,
1750                                      &parent_lockh);
1751         if (IS_ERR(dparent))
1752                 GOTO(cleanup, rc = PTR_ERR(dparent));
1753         cleanup_phase = 1;
1754
1755         dchild = filter_fid2dentry(obd, dparent, group, oa->o_id);
1756         if (IS_ERR(dchild))
1757                 GOTO(cleanup, rc = -ENOENT);
1758         cleanup_phase = 2;
1759
1760         if (dchild->d_inode == NULL) {
1761                 CERROR("destroying non-existent object "LPU64"\n", oa->o_id);
1762                 GOTO(cleanup, rc = -ENOENT);
1763         }
1764
1765         if (!have_prepared) {
1766                 /* If we're really going to destroy the object, get ready
1767                  * by getting the clients to discard their cached data.
1768                  *
1769                  * We have to drop the parent lock, because
1770                  * filter_prepare_destroy will acquire a PW on the object, and
1771                  * we don't want to deadlock with an incoming write to the
1772                  * object, which has the extent PW and then wants to get the
1773                  * parent dentry to do the lookup.
1774                  *
1775                  * We dput the child because it's not worth the extra
1776                  * complication of condition the above code to skip it on the
1777                  * second time through. */
1778                 f_dput(dchild);
1779                 filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1780
1781                 filter_prepare_destroy(obd, oa->o_id);
1782                 have_prepared = 1;
1783                 goto acquire_locks;
1784         }
1785
1786         handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK_LOG, oti);
1787         if (IS_ERR(handle))
1788                 GOTO(cleanup, rc = PTR_ERR(handle));
1789         cleanup_phase = 3;
1790
1791         /* Our MDC connection is established by the MDS to us */
1792         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1793                 OBD_ALLOC(fcc, sizeof(*fcc));
1794                 if (fcc != NULL)
1795                         memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
1796         }
1797
1798         rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
1799
1800 cleanup:
1801         switch(cleanup_phase) {
1802         case 3:
1803                 if (fcc != NULL)
1804                         fsfilt_add_journal_cb(obd, 0, oti->oti_handle,
1805                                               filter_cancel_cookies_cb, fcc);
1806                 rc = filter_finish_transno(exp, oti, rc);
1807                 rc2 = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1808                 if (rc2) {
1809                         CERROR("error on commit, err = %d\n", rc2);
1810                         if (!rc)
1811                                 rc = rc2;
1812                 }
1813         case 2:
1814                 f_dput(dchild);
1815         case 1:
1816                 if (rc || oti == NULL) {
1817                         filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1818                 } else {
1819                         memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh,
1820                                sizeof(parent_lockh));
1821                         oti->oti_ack_locks[0].mode = LCK_PW;
1822                 }
1823         case 0:
1824                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1825                 break;
1826         default:
1827                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1828                 LBUG();
1829         }
1830
1831         RETURN(rc);
1832 }
1833
1834 /* NB start and end are used for punch, but not truncate */
1835 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
1836                            struct lov_stripe_md *lsm,
1837                            obd_off start, obd_off end,
1838                            struct obd_trans_info *oti)
1839 {
1840         int error;
1841         ENTRY;
1842
1843         if (end != OBD_OBJECT_EOF)
1844                 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
1845                        end);
1846
1847         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = %x, "
1848                "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
1849         oa->o_size = start;
1850         error = filter_setattr(exp, oa, NULL, oti);
1851         RETURN(error);
1852 }
1853
1854 static int filter_sync(struct obd_export *exp, struct obdo *oa,
1855                        struct lov_stripe_md *lsm, obd_off start, obd_off end)
1856 {
1857         struct obd_run_ctxt saved;
1858         struct filter_obd *filter;
1859         struct dentry *dentry;
1860         int rc, rc2;
1861         ENTRY;
1862
1863         filter = &exp->exp_obd->u.filter;
1864
1865         /* an objid of zero is taken to mean "sync whole filesystem" */
1866         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
1867                 rc = fsfilt_sync(exp->exp_obd, filter->fo_sb);
1868                 RETURN(rc);
1869         }
1870
1871         dentry = filter_oa2dentry(exp->exp_obd, oa);
1872         if (IS_ERR(dentry))
1873                 RETURN(PTR_ERR(dentry));
1874
1875         push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1876
1877         down(&dentry->d_inode->i_sem);
1878         rc = filemap_fdatasync(dentry->d_inode->i_mapping);
1879         if (rc == 0) {
1880                 /* just any file to grab fsync method - "file" arg unused */
1881                 struct file *file = filter->fo_rcvd_filp;
1882
1883                 if (file->f_op && file->f_op->fsync)
1884                         rc = file->f_op->fsync(NULL, dentry, 1);
1885
1886                 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
1887                 if (!rc)
1888                         rc = rc2;
1889         }
1890         up(&dentry->d_inode->i_sem);
1891
1892         oa->o_valid = OBD_MD_FLID;
1893         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1894
1895         pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1896
1897         f_dput(dentry);
1898         RETURN(rc);
1899 }
1900
1901 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1902                          unsigned long max_age)
1903 {
1904         ENTRY;
1905         RETURN(fsfilt_statfs(obd, obd->u.filter.fo_sb, osfs));
1906 }
1907
1908 static int filter_get_info(struct obd_export *exp, __u32 keylen,
1909                            void *key, __u32 *vallen, void *val)
1910 {
1911         struct obd_device *obd;
1912         ENTRY;
1913
1914         obd = class_exp2obd(exp);
1915         if (obd == NULL) {
1916                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1917                        exp->exp_handle.h_cookie);
1918                 RETURN(-EINVAL);
1919         }
1920
1921         if (keylen == strlen("blocksize") &&
1922             memcmp(key, "blocksize", keylen) == 0) {
1923                 __u32 *blocksize = val;
1924                 *vallen = sizeof(*blocksize);
1925                 *blocksize = obd->u.filter.fo_sb->s_blocksize;
1926                 RETURN(0);
1927         }
1928
1929         if (keylen == strlen("blocksize_bits") &&
1930             memcmp(key, "blocksize_bits", keylen) == 0) {
1931                 __u32 *blocksize_bits = val;
1932                 *vallen = sizeof(*blocksize_bits);
1933                 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
1934                 RETURN(0);
1935         }
1936
1937         if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
1938                 obd_id *last_id = val;
1939                 /* FIXME: object groups */
1940                 *last_id = filter_last_id(&obd->u.filter, 0);
1941                 RETURN(0);
1942         }
1943         CDEBUG(D_IOCTL, "invalid key\n");
1944         RETURN(-EINVAL);
1945 }
1946
1947 static int filter_set_info(struct obd_export *exp, __u32 keylen,
1948                            void *key, __u32 vallen, void *val)
1949 {
1950         struct obd_device *obd;
1951         struct lustre_handle conn;
1952 #ifdef ENABLE_ORPHANS
1953         struct llog_ctxt *ctxt;
1954 #endif
1955         int rc = 0;
1956         ENTRY;
1957
1958         conn.cookie = exp->exp_handle.h_cookie;
1959
1960         obd = exp->exp_obd;
1961         if (obd == NULL) {
1962                 CDEBUG(D_IOCTL, "invalid exp %p cookie "LPX64"\n",
1963                        exp, conn.cookie);
1964                 RETURN(-EINVAL);
1965         }
1966
1967         if (keylen < strlen("mds_conn") ||
1968             memcmp(key, "mds_conn", keylen) != 0)
1969                 RETURN(-EINVAL);
1970
1971         CWARN("Received MDS connection ("LPX64")\n", conn.cookie);
1972         memcpy(&obd->u.filter.fo_mdc_conn, &conn, sizeof(conn));
1973 #ifdef ENABLE_ORPHANS
1974         ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
1975         rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
1976 #endif
1977         RETURN(rc);
1978 }
1979
1980 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
1981                      int len, void *karg, void *uarg)
1982 {
1983         struct obd_device *obd = exp->exp_obd;
1984         struct obd_ioctl_data *data = karg;
1985         int rc = 0;
1986
1987         switch (cmd) {
1988         case OBD_IOC_ABORT_RECOVERY:
1989                 CERROR("aborting recovery for device %s\n", obd->obd_name);
1990                 target_abort_recovery(obd);
1991                 RETURN(0);
1992
1993         case OBD_IOC_SET_READONLY: {
1994                 void *handle;
1995                 struct super_block *sb = obd->u.filter.fo_sb;
1996                 struct inode *inode = sb->s_root->d_inode;
1997                 BDEVNAME_DECLARE_STORAGE(tmp);
1998                 CERROR("setting device %s read-only\n",
1999                        ll_bdevname(sb, tmp));
2000
2001                 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
2002                 LASSERT(handle);
2003                 (void)fsfilt_commit(obd, inode, handle, 1);
2004
2005                 dev_set_rdonly(ll_sbdev(obd->u.filter.fo_sb), 2);
2006                 RETURN(0);
2007         }
2008
2009         case OBD_IOC_CATLOGLIST: {
2010                 rc = llog_catlog_list(obd, 1, data);
2011                 RETURN(rc);
2012         }
2013
2014         case OBD_IOC_LLOG_CANCEL:
2015         case OBD_IOC_LLOG_REMOVE:
2016         case OBD_IOC_LLOG_INFO:
2017         case OBD_IOC_LLOG_PRINT: {
2018                 /* FIXME to be finished */
2019                 RETURN(-EOPNOTSUPP);
2020 /*
2021                 struct llog_ctxt *ctxt = NULL;
2022
2023                 push_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2024                 rc = llog_ioctl(ctxt, cmd, data);
2025                 pop_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2026
2027                 RETURN(rc);
2028 */
2029         }
2030
2031
2032         default:
2033                 RETURN(-EINVAL);
2034         }
2035         RETURN(0);
2036 }
2037
2038 static struct llog_operations filter_unlink_repl_logops;
2039 static struct llog_operations filter_size_orig_logops = {
2040         lop_setup: llog_obd_origin_setup,
2041         lop_cleanup: llog_obd_origin_cleanup,
2042         lop_add: llog_obd_origin_add
2043 };
2044
2045 static int filter_llog_init(struct obd_device *obd, struct obd_device *tgt,
2046                             int count, struct llog_logid *logid)
2047 {
2048         struct llog_ctxt *ctxt;
2049         int rc;
2050         ENTRY;
2051
2052         filter_unlink_repl_logops = llog_client_ops;
2053         filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
2054         filter_unlink_repl_logops.lop_connect = llog_repl_connect;
2055         filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
2056
2057         rc = llog_setup(obd, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
2058                         &filter_unlink_repl_logops);
2059         if (rc)
2060                 RETURN(rc);
2061         /* FIXME - assign unlink_cb for filter's recovery */
2062         ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
2063         ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
2064
2065         rc = llog_setup(obd, LLOG_SIZE_ORIG_CTXT, tgt, 0, NULL,
2066                         &filter_size_orig_logops);
2067         RETURN(rc);
2068 }
2069
2070 static int filter_llog_finish(struct obd_device *obd, int count)
2071 {
2072         int rc;
2073         ENTRY;
2074
2075         rc = llog_cleanup(llog_get_context(obd, LLOG_UNLINK_REPL_CTXT));
2076         if (rc)
2077                 RETURN(rc);
2078
2079         rc = llog_cleanup(llog_get_context(obd, LLOG_SIZE_ORIG_CTXT));
2080         RETURN(rc);
2081 }
2082
2083 static struct dentry *filter_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr,
2084                                              void *data)
2085 {
2086         return filter_fid2dentry(data, NULL, gr, id);
2087 }
2088
2089 static struct lvfs_callback_ops filter_lvfs_ops = {
2090         l_fid2dentry:     filter_lvfs_fid2dentry,
2091 };
2092
2093 static struct obd_ops filter_obd_ops = {
2094         o_owner:          THIS_MODULE,
2095         o_attach:         filter_attach,
2096         o_detach:         filter_detach,
2097         o_get_info:       filter_get_info,
2098         o_set_info:       filter_set_info,
2099         o_setup:          filter_setup,
2100         o_postsetup:      filter_postsetup,
2101         o_precleanup:     filter_precleanup,
2102         o_cleanup:        filter_cleanup,
2103         o_connect:        filter_connect,
2104         o_disconnect:     filter_disconnect,
2105         o_statfs:         filter_statfs,
2106         o_getattr:        filter_getattr,
2107         o_unpackmd:       filter_unpackmd,
2108         o_create:         filter_create,
2109         o_setattr:        filter_setattr,
2110         o_destroy:        filter_destroy,
2111         o_brw:            filter_brw,
2112         o_punch:          filter_truncate,
2113         o_sync:           filter_sync,
2114         o_preprw:         filter_preprw,
2115         o_commitrw:       filter_commitrw,
2116         o_destroy_export: filter_destroy_export,
2117         o_llog_init:      filter_llog_init,
2118         o_llog_finish:    filter_llog_finish,
2119         o_iocontrol:      filter_iocontrol,
2120 };
2121
2122 static struct obd_ops filter_sanobd_ops = {
2123         o_owner:          THIS_MODULE,
2124         o_attach:         filter_attach,
2125         o_detach:         filter_detach,
2126         o_get_info:       filter_get_info,
2127         o_set_info:       filter_set_info,
2128         o_setup:          filter_san_setup,
2129         o_precleanup:     filter_precleanup,
2130         o_cleanup:        filter_cleanup,
2131         o_connect:        filter_connect,
2132         o_disconnect:     filter_disconnect,
2133         o_statfs:         filter_statfs,
2134         o_getattr:        filter_getattr,
2135         o_unpackmd:       filter_unpackmd,
2136         o_create:         filter_create,
2137         o_setattr:        filter_setattr,
2138         o_destroy:        filter_destroy,
2139         o_brw:            filter_brw,
2140         o_punch:          filter_truncate,
2141         o_sync:           filter_sync,
2142         o_preprw:         filter_preprw,
2143         o_commitrw:       filter_commitrw,
2144         o_san_preprw:     filter_san_preprw,
2145         o_destroy_export: filter_destroy_export,
2146         o_llog_init:      filter_llog_init,
2147         o_llog_finish:    filter_llog_finish,
2148         o_iocontrol:      filter_iocontrol,
2149 };
2150
2151 static int __init obdfilter_init(void)
2152 {
2153         struct lprocfs_static_vars lvars;
2154         int rc;
2155
2156         printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
2157
2158         lprocfs_init_vars(filter, &lvars);
2159
2160         rc = class_register_type(&filter_obd_ops, lvars.module_vars,
2161                                  OBD_FILTER_DEVICENAME);
2162         if (rc)
2163                 return rc;
2164
2165         rc = class_register_type(&filter_sanobd_ops, lvars.module_vars,
2166                                  OBD_FILTER_SAN_DEVICENAME);
2167         if (rc)
2168                 class_unregister_type(OBD_FILTER_DEVICENAME);
2169         return rc;
2170 }
2171
2172 static void __exit obdfilter_exit(void)
2173 {
2174         class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
2175         class_unregister_type(OBD_FILTER_DEVICENAME);
2176 }
2177
2178 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2179 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
2180 MODULE_LICENSE("GPL");
2181
2182 module_init(obdfilter_init);
2183 module_exit(obdfilter_exit);