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 = cpu_to_le64(filter->fo_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 & ~cpu_to_le32(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 & ~cpu_to_le32(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 mount_count: "LPU64"\n",
 402                obd->obd_name, mount_count + 1);
 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(fsd->fsd_last_transno))
 487                         fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
 488
 489         }
 490
 491         obd->obd_last_committed = le64_to_cpu(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(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         filter->fo_mount_count = mount_count + 1;
 506         fsd->fsd_mount_count = cpu_to_le64(filter->fo_mount_count);
 507
 508         /* save it, so mount count and last_transno is current */
 509         rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
 510
 511         RETURN(rc);
 512
 513 err_client:
 514         class_disconnect_exports(obd, 0);
 515 err_fsd:
 516         filter_free_server_data(filter);
 517         RETURN(rc);
 518 }
 519
 520 static int filter_cleanup_groups(struct obd_device *obd)
 521 {
 522         struct filter_obd *filter = &obd->u.filter;
 523         int i;
 524         ENTRY;
 525
 526         if (filter->fo_dentry_O_groups != NULL &&
 527             filter->fo_last_objids != NULL &&
 528             filter->fo_last_objid_files != NULL) {
 529                 for (i = 0; i < FILTER_GROUPS; i++) {
 530                         struct dentry *dentry = filter->fo_dentry_O_groups[i];
 531                         struct file *filp = filter->fo_last_objid_files[i];
 532                         if (dentry != NULL) {
 533                                 f_dput(dentry);
 534                                 filter->fo_dentry_O_groups[i] = NULL;
 535                         }
 536                         if (filp != NULL) {
 537                                 filp_close(filp, 0);
 538                                 filter->fo_last_objid_files[i] = NULL;
 539                         }
 540                 }
 541         }
 542         if (filter->fo_dentry_O_sub != NULL && filter->fo_subdir_count) {
 543                 for (i = 0; i < filter->fo_subdir_count; i++) {
 544                         struct dentry *dentry = filter->fo_dentry_O_sub[i];
 545                         if (dentry != NULL) {
 546                                 f_dput(dentry);
 547                                 filter->fo_dentry_O_sub[i] = NULL;
 548                         }
 549                 }
 550                 OBD_FREE(filter->fo_dentry_O_sub,
 551                          filter->fo_subdir_count *
 552                          sizeof(*filter->fo_dentry_O_sub));
 553         }
 554         if (filter->fo_dentry_O_groups != NULL)
 555                 OBD_FREE(filter->fo_dentry_O_groups,
 556                          FILTER_GROUPS * sizeof(struct dentry *));
 557         if (filter->fo_last_objids != NULL)
 558                 OBD_FREE(filter->fo_last_objids,
 559                          FILTER_GROUPS * sizeof(__u64));
 560         if (filter->fo_last_objid_files != NULL)
 561                 OBD_FREE(filter->fo_last_objid_files,
 562                          FILTER_GROUPS * sizeof(struct file *));
 563         RETURN(0);
 564 }
 565
 566 /* FIXME: object groups */
 567 static int filter_prep_groups(struct obd_device *obd)
 568 {
 569         struct filter_obd *filter = &obd->u.filter;
 570         struct dentry *dentry, *O_dentry;
 571         struct file *filp;
 572         int i, rc = 0, cleanup_phase = 0;
 573         ENTRY;
 574
 575         O_dentry = simple_mkdir(current->fs->pwd, "O", 0700);
 576         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
 577         if (IS_ERR(O_dentry)) {
 578                 rc = PTR_ERR(O_dentry);
 579                 CERROR("cannot open/create O: rc = %d\n", rc);
 580                 GOTO(cleanup, rc);
 581         }
 582         filter->fo_dentry_O = O_dentry;
 583         cleanup_phase = 1; /* O_dentry */
 584
 585         /* Lookup "R" to tell if we're on an old OST FS and need to convert
 586          * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
 587          * some time post 1.0 when all old-style OSTs have converted along
 588          * with the init_objid hack. */
 589         dentry = ll_lookup_one_len("R", O_dentry, 1);
 590         if (IS_ERR(dentry))
 591                 GOTO(cleanup, rc = PTR_ERR(dentry));
 592         if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
 593                 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
 594                 ENTRY;
 595
 596                 CWARN("converting OST to new object layout\n");
 597                 if (IS_ERR(O0_dentry)) {
 598                         rc = PTR_ERR(O0_dentry);
 599                         CERROR("error looking up O/0: rc %d\n", rc);
 600                         GOTO(cleanup_R, rc);
 601                 }
 602
 603                 if (O0_dentry->d_inode) {
 604                         CERROR("Both O/R and O/0 exist. Fix manually.\n");
 605                         GOTO(cleanup_O0, rc = -EEXIST);
 606                 }
 607
 608                 down(&O_dentry->d_inode->i_sem);
 609                 rc = vfs_rename(O_dentry->d_inode, dentry,
 610                                 O_dentry->d_inode, O0_dentry);
 611                 up(&O_dentry->d_inode->i_sem);
 612
 613                 if (rc) {
 614                         CERROR("error renaming O/R to O/0: rc %d\n", rc);
 615                         GOTO(cleanup_O0, rc);
 616                 }
 617                 filter->fo_fsd->fsd_feature_incompat |=
 618                         cpu_to_le32(FILTER_INCOMPAT_GROUPS);
 619                 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 620                                                filter->fo_fsd, 1);
 621                 GOTO(cleanup_O0, rc);
 622
 623         cleanup_O0:
 624                 dput(O0_dentry);
 625         cleanup_R:
 626                 dput(dentry);
 627                 if (rc)
 628                         GOTO(cleanup, rc);
 629         } else {
 630                 dput(dentry);
 631         }
 632
 633         OBD_ALLOC(filter->fo_last_objids, FILTER_GROUPS * sizeof(__u64));
 634         if (filter->fo_last_objids == NULL)
 635                 GOTO(cleanup, rc = -ENOMEM);
 636         cleanup_phase = 2; /* groups */
 637
 638         OBD_ALLOC(filter->fo_dentry_O_groups, FILTER_GROUPS * sizeof(dentry));
 639         if (filter->fo_dentry_O_groups == NULL)
 640                 GOTO(cleanup, rc = -ENOMEM);
 641         OBD_ALLOC(filter->fo_last_objid_files, FILTER_GROUPS * sizeof(filp));
 642         if (filter->fo_last_objid_files == NULL)
 643                 GOTO(cleanup, rc = -ENOMEM);
 644
 645         for (i = 0; i < FILTER_GROUPS; i++) {
 646                 char name[25];
 647                 loff_t off = 0;
 648
 649                 sprintf(name, "%d", i);
 650                 dentry = simple_mkdir(O_dentry, name, 0700);
 651                 CDEBUG(D_INODE, "got/created O/%s: %p\n", name, dentry);
 652                 if (IS_ERR(dentry)) {
 653                         rc = PTR_ERR(dentry);
 654                         CERROR("cannot lookup/create O/%s: rc = %d\n",
 655                                name, rc);
 656                         GOTO(cleanup, rc);
 657                 }
 658                 filter->fo_dentry_O_groups[i] = dentry;
 659
 660                 sprintf(name, "O/%d/LAST_ID", i);
 661                 filp = filp_open(name, O_CREAT | O_RDWR, 0700);
 662                 if (IS_ERR(dentry)) {
 663                         rc = PTR_ERR(dentry);
 664                         CERROR("cannot create %s: rc = %d\n", name, rc);
 665                         GOTO(cleanup, rc);
 666                 }
 667                 filter->fo_last_objid_files[i] = filp;
 668
 669                 if (filp->f_dentry->d_inode->i_size == 0) {
 670                         if (i == 0 && filter->fo_fsd->fsd_unused != 0) {
 671                                 /* OST conversion, remove sometime post 1.0 */
 672                                 filter->fo_last_objids[i] =
 673                                         le64_to_cpu(filter->fo_fsd->fsd_unused);
 674                                 CWARN("saving old objid "LPU64" to LAST_ID\n",
 675                                       filter->fo_last_objids[i]);
 676                                 rc = filter_update_last_objid(obd, 0, 1);
 677                                 if (rc)
 678                                         GOTO(cleanup, rc);
 679                         } else {
 680                                 filter->fo_last_objids[i] = FILTER_INIT_OBJID;
 681                         }
 682                         continue;
 683                 }
 684
 685                 rc = fsfilt_read_record(obd, filp, &filter->fo_last_objids[i],
 686                                         sizeof(__u64), &off);
 687                 if (rc) {
 688                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 689                                name, rc);
 690                         GOTO(cleanup, rc);
 691                 }
 692                 filter->fo_last_objids[i] =
 693                         le64_to_cpu(filter->fo_last_objids[i]);
 694                 CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
 695                        obd->obd_name, i, filter->fo_last_objids[i]);
 696         }
 697
 698         if (filter->fo_subdir_count) {
 699                 O_dentry = filter->fo_dentry_O_groups[0];
 700                 OBD_ALLOC(filter->fo_dentry_O_sub,
 701                           filter->fo_subdir_count * sizeof(dentry));
 702                 if (filter->fo_dentry_O_sub == NULL)
 703                         GOTO(cleanup, rc = -ENOMEM);
 704
 705                 for (i = 0; i < filter->fo_subdir_count; i++) {
 706                         char dir[20];
 707                         snprintf(dir, sizeof(dir), "d%u", i);
 708
 709                         dentry = simple_mkdir(O_dentry, dir, 0700);
 710                         CDEBUG(D_INODE, "got/created O/0/%s: %p\n", dir,dentry);
 711                         if (IS_ERR(dentry)) {
 712                                 rc = PTR_ERR(dentry);
 713                                 CERROR("can't lookup/create O/0/%s: rc = %d\n",
 714                                        dir, rc);
 715                                 GOTO(cleanup, rc);
 716                         }
 717                         filter->fo_dentry_O_sub[i] = dentry;
 718                 }
 719         }
 720         RETURN(0);
 721
 722  cleanup:
 723         switch (cleanup_phase) {
 724         case 2:
 725                 filter_cleanup_groups(obd);
 726         case 1:
 727                 f_dput(filter->fo_dentry_O);
 728                 filter->fo_dentry_O = NULL;
 729         default:
 730                 break;
 731         }
 732         return rc;
 733 }
 734
 735 /* setup the object store with correct subdirectories */
 736 static int filter_prep(struct obd_device *obd)
 737 {
 738         struct obd_run_ctxt saved;
 739         struct filter_obd *filter = &obd->u.filter;
 740         struct file *file;
 741         struct inode *inode;
 742         int rc = 0;
 743         ENTRY;
 744
 745         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 746         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 747         if (!file || IS_ERR(file)) {
 748                 rc = PTR_ERR(file);
 749                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 750                        LAST_RCVD, rc);
 751                 GOTO(out, rc);
 752         }
 753
 754         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 755                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
 756                        file->f_dentry->d_inode->i_mode);
 757                 GOTO(err_filp, rc = -ENOENT);
 758         }
 759
 760         /* steal operations */
 761         inode = file->f_dentry->d_inode;
 762         filter->fo_fop = file->f_op;
 763         filter->fo_iop = inode->i_op;
 764         filter->fo_aops = inode->i_mapping->a_ops;
 765
 766         rc = filter_init_server_data(obd, file);
 767         if (rc) {
 768                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
 769                 GOTO(err_filp, rc);
 770         }
 771         filter->fo_rcvd_filp = file;
 772
 773         rc = filter_prep_groups(obd);
 774         if (rc)
 775                 GOTO(err_server_data, rc);
 776
 777  out:
 778         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 779
 780         return(rc);
 781
 782  err_server_data:
 783         //class_disconnect_exports(obd, 0);
 784         filter_free_server_data(filter);
 785  err_filp:
 786         if (filp_close(file, 0))
 787                 CERROR("can't close %s after error\n", LAST_RCVD);
 788         filter->fo_rcvd_filp = NULL;
 789         goto out;
 790 }
 791
 792 /* cleanup the filter: write last used object id to status file */
 793 static void filter_post(struct obd_device *obd)
 794 {
 795         struct obd_run_ctxt saved;
 796         struct filter_obd *filter = &obd->u.filter;
 797         int rc, i;
 798
 799         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
 800          * best to start a transaction with h_sync, because we removed this
 801          * from lastobjid */
 802
 803         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 804         rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 805                                        filter->fo_fsd, 0);
 806         if (rc)
 807                 CERROR("error writing server data: rc = %d\n", rc);
 808
 809         for (i = 0; i < FILTER_GROUPS; i++) {
 810                 rc = filter_update_last_objid(obd, i, (i == FILTER_GROUPS - 1));
 811                 if (rc)
 812                         CERROR("error writing group %d lastobjid: rc = %d\n",
 813                                i, rc);
 814         }
 815
 816         filp_close(filter->fo_rcvd_filp, 0);
 817         filter->fo_rcvd_filp = NULL;
 818         if (rc)
 819                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
 820
 821         filter_cleanup_groups(obd);
 822         f_dput(filter->fo_dentry_O);
 823         filter_free_server_data(filter);
 824         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 825 }
 826
 827 static void filter_set_last_id(struct filter_obd *filter, struct obdo *oa,
 828                                obd_id id)
 829 {
 830         obd_gr group = 0;
 831         LASSERT(filter->fo_fsd != NULL);
 832
 833         if (oa != NULL) {
 834                 LASSERT(oa->o_gr <= FILTER_GROUPS);
 835                 group = oa->o_gr;
 836         }
 837
 838         spin_lock(&filter->fo_objidlock);
 839         filter->fo_last_objids[group] = id;
 840         spin_unlock(&filter->fo_objidlock);
 841 }
 842
 843 __u64 filter_last_id(struct filter_obd *filter, struct obdo *oa)
 844 {
 845         obd_id id;
 846         obd_gr group = 0;
 847         LASSERT(filter->fo_fsd != NULL);
 848
 849         if (oa != NULL) {
 850                 LASSERT(oa->o_gr <= FILTER_GROUPS);
 851                 group = oa->o_gr;
 852         }
 853
 854         /* FIXME: object groups */
 855         spin_lock(&filter->fo_objidlock);
 856         id = filter->fo_last_objids[group];
 857         spin_unlock(&filter->fo_objidlock);
 858
 859         return id;
 860 }
 861
 862 /* direct cut-n-paste of mds_blocking_ast() */
 863 static int filter_blocking_ast(struct ldlm_lock *lock,
 864                                struct ldlm_lock_desc *desc,
 865                                void *data, int flag)
 866 {
 867         int do_ast;
 868         ENTRY;
 869
 870         if (flag == LDLM_CB_CANCELING) {
 871                 /* Don't need to do anything here. */
 872                 RETURN(0);
 873         }
 874
 875         /* XXX layering violation!  -phil */
 876         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 877         /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
 878          * such that filter_blocking_ast is called just before l_i_p takes the
 879          * ns_lock, then by the time we get the lock, we might not be the
 880          * correct blocking function anymore.  So check, and return early, if
 881          * so. */
 882         if (lock->l_blocking_ast != filter_blocking_ast) {
 883                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 884                 RETURN(0);
 885         }
 886
 887         lock->l_flags |= LDLM_FL_CBPENDING;
 888         do_ast = (!lock->l_readers && !lock->l_writers);
 889         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 890
 891         if (do_ast) {
 892                 struct lustre_handle lockh;
 893                 int rc;
 894
 895                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 896                 ldlm_lock2handle(lock, &lockh);
 897                 rc = ldlm_cli_cancel(&lockh);
 898                 if (rc < 0)
 899                         CERROR("ldlm_cli_cancel: %d\n", rc);
 900         } else {
 901                 LDLM_DEBUG(lock, "Lock still has references, will be "
 902                            "cancelled later");
 903         }
 904         RETURN(0);
 905 }
 906
 907 static int filter_lock_dentry(struct obd_device *obd, struct dentry *de,
 908                               ldlm_mode_t lock_mode,struct lustre_handle *lockh)
 909 {
 910         struct ldlm_res_id res_id = { .name = {0} };
 911         int flags = 0, rc;
 912         ENTRY;
 913
 914         res_id.name[0] = de->d_inode->i_ino;
 915         res_id.name[1] = de->d_inode->i_generation;
 916         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 917                               res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 918                               &flags, ldlm_completion_ast,
 919                               filter_blocking_ast, NULL, lockh);
 920
 921         RETURN(rc == ELDLM_OK ? 0 : -EIO);  /* XXX translate ldlm code */
 922 }
 923
 924 /* We never dget the object parent, so DON'T dput it either */
 925 static void filter_parent_unlock(struct dentry *dparent,
 926                                  struct lustre_handle *lockh,
 927                                  ldlm_mode_t lock_mode)
 928 {
 929         ldlm_lock_decref(lockh, lock_mode);
 930 }
 931
 932 /* We never dget the object parent, so DON'T dput it either */
 933 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
 934 {
 935         struct filter_obd *filter = &obd->u.filter;
 936         LASSERT(group < FILTER_GROUPS); /* FIXME: object groups */
 937
 938         if (group > 0 || filter->fo_subdir_count == 0)
 939                 return filter->fo_dentry_O_groups[group];
 940
 941         return filter->fo_dentry_O_sub[objid & (filter->fo_subdir_count - 1)];
 942 }
 943
 944 /* We never dget the object parent, so DON'T dput it either */
 945 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
 946                                   obd_id objid, ldlm_mode_t lock_mode,
 947                                   struct lustre_handle *lockh)
 948 {
 949         unsigned long now = jiffies;
 950         struct dentry *de = filter_parent(obd, group, objid);
 951         int rc;
 952
 953         if (IS_ERR(de))
 954                 return de;
 955
 956         rc = filter_lock_dentry(obd, de, lock_mode, lockh);
 957         if (time_after(jiffies, now + 15 * HZ))
 958                 CERROR("slow parent lock %lus\n", (jiffies - now) / HZ);
 959         return rc ? ERR_PTR(rc) : de;
 960 }
 961
 962 /* How to get files, dentries, inodes from object id's.
 963  *
 964  * If dir_dentry is passed, the caller has already locked the parent
 965  * appropriately for this operation (normally a write lock).  If
 966  * dir_dentry is NULL, we do a read lock while we do the lookup to
 967  * avoid races with create/destroy and such changing the directory
 968  * internal to the filesystem code. */
 969 struct dentry *filter_fid2dentry(struct obd_device *obd,
 970                                  struct dentry *dir_dentry,
 971                                  obd_gr group, obd_id id)
 972 {
 973         struct lustre_handle lockh;
 974         struct dentry *dparent = dir_dentry;
 975         struct dentry *dchild;
 976         char name[32];
 977         int len;
 978         ENTRY;
 979
 980         if (id == 0) {
 981                 CERROR("fatal: invalid object id 0\n");
 982                 RETURN(ERR_PTR(-ESTALE));
 983         }
 984
 985         len = sprintf(name, LPU64, id);
 986         if (dir_dentry == NULL) {
 987                 dparent = filter_parent_lock(obd, group, id, LCK_PR, &lockh);
 988                 if (IS_ERR(dparent))
 989                         RETURN(dparent);
 990         }
 991         CDEBUG(D_INODE, "looking up object O/%*s/%s\n",
 992                dparent->d_name.len, dparent->d_name.name, name);
 993         dchild = ll_lookup_one_len(name, dparent, len);
 994         if (dir_dentry == NULL)
 995                 filter_parent_unlock(dparent, &lockh, LCK_PR);
 996         if (IS_ERR(dchild)) {
 997                 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
 998                 RETURN(dchild);
 999         }
1000
1001         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1002                name, dchild, atomic_read(&dchild->d_count));
1003
1004         LASSERT(atomic_read(&dchild->d_count) > 0);
1005
1006         RETURN(dchild);
1007 }
1008
1009 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid)
1010 {
1011         struct lustre_handle lockh;
1012         int flags = LDLM_AST_DISCARD_DATA, rc;
1013         struct ldlm_res_id res_id = { .name = { objid } };
1014         struct ldlm_extent extent = { 0, OBD_OBJECT_EOF };
1015         ENTRY;
1016
1017         /* Tell the clients that the object is gone now and that they should
1018          * throw away any cached pages.  If we're the OST at stripe 0 in the
1019          * file then this enqueue will communicate the DISCARD to all the
1020          * clients.  This assumes that we always destroy all the objects for
1021          * a file at a time, as is currently the case.  If we're not the
1022          * OST at stripe 0 then we'll harmlessly get a very lonely lock in
1023          * the local DLM and immediately drop it. */
1024         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
1025                               res_id, LDLM_EXTENT, &extent,
1026                               sizeof(extent), LCK_PW, &flags,
1027                               ldlm_completion_ast, filter_blocking_ast,
1028                               NULL, &lockh);
1029
1030         /* We only care about the side-effects, just drop the lock. */
1031         if (rc == ELDLM_OK)
1032                 ldlm_lock_decref(&lockh, LCK_PW);
1033
1034         RETURN(rc);
1035 }
1036
1037 /* Caller must hold LCK_PW on parent and push us into kernel context.
1038  * Caller is also required to ensure that dchild->d_inode exists. */
1039 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1040                                    struct dentry *dparent,
1041                                    struct dentry *dchild)
1042 {
1043         struct inode *inode = dchild->d_inode;
1044         int rc;
1045         ENTRY;
1046
1047         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1048                 CERROR("destroying objid %*s nlink = %lu, count = %d\n",
1049                        dchild->d_name.len, dchild->d_name.name,
1050                        (unsigned long)inode->i_nlink,
1051                        atomic_read(&inode->i_count));
1052         }
1053
1054         rc = vfs_unlink(dparent->d_inode, dchild);
1055
1056         if (rc)
1057                 CERROR("error unlinking objid %*s: rc %d\n",
1058                        dchild->d_name.len, dchild->d_name.name, rc);
1059
1060         RETURN(rc);
1061 }
1062
1063 /* mount the file system (secretly) */
1064 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1065                         char *option)
1066 {
1067         struct lustre_cfg* lcfg = buf;
1068         struct filter_obd *filter = &obd->u.filter;
1069         struct vfsmount *mnt;
1070         int rc = 0;
1071         ENTRY;
1072
1073         dev_clear_rdonly(2);
1074
1075         if (!lcfg->lcfg_inlbuf1 || !lcfg->lcfg_inlbuf2)
1076                 RETURN(-EINVAL);
1077
1078         obd->obd_fsops = fsfilt_get_ops(lcfg->lcfg_inlbuf2);
1079         if (IS_ERR(obd->obd_fsops))
1080                 RETURN(PTR_ERR(obd->obd_fsops));
1081
1082         mnt = do_kern_mount(lcfg->lcfg_inlbuf2, MS_NOATIME | MS_NODIRATIME,
1083                             lcfg->lcfg_inlbuf1, option);
1084         rc = PTR_ERR(mnt);
1085         if (IS_ERR(mnt))
1086                 GOTO(err_ops, rc);
1087
1088         if (lcfg->lcfg_inllen3 > 0 && lcfg->lcfg_inlbuf3) {
1089                 if (*lcfg->lcfg_inlbuf3 == 'f') {
1090                         obd->obd_replayable = 1;
1091                         obd_sync_filter = 1;
1092                         CERROR("%s: recovery enabled\n", obd->obd_name);
1093                 } else {
1094                         if (*lcfg->lcfg_inlbuf3 != 'n') {
1095                                 CERROR("unrecognised flag '%c'\n",
1096                                        *lcfg->lcfg_inlbuf3);
1097                         }
1098                         // XXX Robert? Why do we get errors here
1099                         // GOTO(err_mntput, rc = -EINVAL);
1100                 }
1101         }
1102
1103         filter->fo_vfsmnt = mnt;
1104         filter->fo_sb = mnt->mnt_sb;
1105         filter->fo_fstype = mnt->mnt_sb->s_type->name;
1106         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1107
1108         OBD_SET_CTXT_MAGIC(&obd->obd_ctxt);
1109         obd->obd_ctxt.pwdmnt = mnt;
1110         obd->obd_ctxt.pwd = mnt->mnt_root;
1111         obd->obd_ctxt.fs = get_ds();
1112         obd->obd_ctxt.cb_ops = filter_lvfs_ops;
1113
1114         rc = filter_prep(obd);
1115         if (rc)
1116                 GOTO(err_mntput, rc);
1117
1118         spin_lock_init(&filter->fo_translock);
1119         spin_lock_init(&filter->fo_objidlock);
1120         INIT_LIST_HEAD(&filter->fo_export_list);
1121         sema_init(&filter->fo_alloc_lock, 1);
1122
1123         obd->obd_namespace = ldlm_namespace_new("filter-tgt",
1124                                                 LDLM_NAMESPACE_SERVER);
1125         if (obd->obd_namespace == NULL)
1126                 GOTO(err_post, rc = -ENOMEM);
1127
1128         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1129                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1130
1131         RETURN(0);
1132
1133 err_post:
1134         filter_post(obd);
1135 err_mntput:
1136         unlock_kernel();
1137         mntput(mnt);
1138         filter->fo_sb = 0;
1139         lock_kernel();
1140 err_ops:
1141         fsfilt_put_ops(obd->obd_fsops);
1142         return rc;
1143 }
1144
1145 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1146 {
1147         struct lustre_cfg* lcfg = buf;
1148         const char *str = NULL;
1149         char *option = NULL;
1150         int n = 0;
1151         int rc;
1152
1153         if (!strcmp(lcfg->lcfg_inlbuf2, "ext3")) {
1154 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1155         /* bug 1577: implement async-delete for 2.5 */
1156                 str = "errors=remount-ro,asyncdel";
1157 #else
1158                 str = "errors=remount-ro";
1159 #endif
1160                 n = strlen(str) + 1;
1161                 OBD_ALLOC(option, n);
1162                 if (option == NULL)
1163                         RETURN(-ENOMEM);
1164                 strcpy(option, str);
1165         }
1166
1167         rc = filter_common_setup(obd, len, buf, option);
1168         if (option)
1169                 OBD_FREE(option, n);
1170         return rc;
1171 }
1172
1173 static int filter_postsetup(struct obd_device *obd)
1174 {
1175         int rc = 0;
1176         ENTRY;
1177
1178         // XXX add a storage location for the logid for size changes
1179 #ifdef ENABLE_ORPHANS
1180         rc = llog_cat_initialize(obd, 1);
1181         if (rc)
1182                 CERROR("failed to setup llogging subsystems\n");
1183 #endif
1184         RETURN(rc);
1185 }
1186
1187 static int filter_cleanup(struct obd_device *obd, int flags)
1188 {
1189         struct filter_obd *filter = &obd->u.filter;
1190         ENTRY;
1191
1192         if (flags & OBD_OPT_FAILOVER)
1193                 CERROR("%s: shutting down for failover; client state will"
1194                        " be preserved.\n", obd->obd_name);
1195
1196         if (!list_empty(&obd->obd_exports)) {
1197                 CERROR("%s: still has clients!\n", obd->obd_name);
1198                 class_disconnect_exports(obd, flags);
1199                 if (!list_empty(&obd->obd_exports)) {
1200                         CERROR("still has exports after forced cleanup?\n");
1201                         RETURN(-EBUSY);
1202                 }
1203         }
1204
1205         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1206
1207         if (filter->fo_sb == NULL)
1208                 RETURN(0);
1209
1210         filter_post(obd);
1211
1212         shrink_dcache_parent(filter->fo_sb->s_root);
1213         filter->fo_sb = 0;
1214
1215         if (atomic_read(&filter->fo_vfsmnt->mnt_count) > 1)
1216                 CERROR("%s: mount point %p busy, mnt_count: %d\n",
1217                        obd->obd_name, filter->fo_vfsmnt,
1218                        atomic_read(&filter->fo_vfsmnt->mnt_count));
1219
1220         unlock_kernel();
1221         mntput(filter->fo_vfsmnt);
1222         //destroy_buffers(filter->fo_sb->s_dev);
1223         filter->fo_sb = NULL;
1224         fsfilt_put_ops(obd->obd_fsops);
1225         lock_kernel();
1226
1227         dev_clear_rdonly(2);
1228
1229         RETURN(0);
1230 }
1231
1232 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1233 {
1234         struct lprocfs_static_vars lvars;
1235         int rc;
1236
1237         lprocfs_init_vars(filter, &lvars);
1238         rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1239         if (rc != 0)
1240                 return rc;
1241
1242         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1243         if (rc != 0)
1244                 return rc;
1245
1246         /* Init obdfilter private stats here */
1247         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1248                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1249         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1250                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1251         return rc;
1252 }
1253
1254 static int filter_detach(struct obd_device *dev)
1255 {
1256         lprocfs_free_obd_stats(dev);
1257         return lprocfs_obd_detach(dev);
1258 }
1259
1260 /* nearly identical to mds_connect */
1261 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1262                           struct obd_uuid *cluuid)
1263 {
1264         struct obd_export *exp;
1265         struct filter_export_data *fed;
1266         struct filter_client_data *fcd = NULL;
1267         struct filter_obd *filter = &obd->u.filter;
1268         int rc;
1269         ENTRY;
1270
1271         if (conn == NULL || obd == NULL || cluuid == NULL)
1272                 RETURN(-EINVAL);
1273
1274         rc = class_connect(conn, obd, cluuid);
1275         if (rc)
1276                 RETURN(rc);
1277         exp = class_conn2export(conn);
1278         LASSERT(exp != NULL);
1279
1280         fed = &exp->exp_filter_data;
1281
1282         spin_lock_init(&fed->fed_lock);
1283
1284         if (!obd->obd_replayable)
1285                 GOTO(cleanup, rc = 0);
1286
1287         OBD_ALLOC(fcd, sizeof(*fcd));
1288         if (!fcd) {
1289                 CERROR("filter: out of memory for client data\n");
1290                 GOTO(cleanup, rc = -ENOMEM);
1291         }
1292
1293         memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1294         fed->fed_fcd = fcd;
1295         fcd->fcd_mount_count = cpu_to_le64(filter->fo_mount_count);
1296
1297         rc = filter_client_add(obd, filter, fed, -1);
1298
1299 cleanup:
1300         if (rc) {
1301                 if (fcd)
1302                         OBD_FREE(fcd, sizeof(*fcd));
1303                 class_disconnect(exp, 0);
1304         } else {
1305                 class_export_put(exp);
1306         }
1307         return rc;
1308 }
1309
1310 static int filter_precleanup(struct obd_device *obd, int flags)
1311 {
1312         int rc = 0;
1313         ENTRY;
1314
1315 #ifdef ENABLE_ORPHANS
1316         rc = obd_llog_finish(obd, 0);
1317         if (rc)
1318                 CERROR("failed to cleanup llogging subsystem\n");
1319 #endif
1320
1321         RETURN(rc);
1322 }
1323
1324 static int filter_destroy_export(struct obd_export *exp)
1325 {
1326         ENTRY;
1327
1328         target_destroy_export(exp);
1329
1330         if (exp->exp_obd->obd_replayable)
1331                 filter_client_free(exp, exp->exp_flags);
1332         RETURN(0);
1333 }
1334
1335 /* also incredibly similar to mds_disconnect */
1336 static int filter_disconnect(struct obd_export *exp, int flags)
1337 {
1338         unsigned long irqflags;
1339         struct llog_ctxt *ctxt;
1340         int rc;
1341         ENTRY;
1342
1343         LASSERT(exp);
1344         ldlm_cancel_locks_for_export(exp);
1345
1346         spin_lock_irqsave(&exp->exp_lock, irqflags);
1347         exp->exp_flags = flags;
1348         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
1349
1350         fsfilt_sync(exp->exp_obd, exp->exp_obd->u.filter.fo_sb);
1351         /* XXX cleanup preallocated inodes */
1352
1353         /* flush any remaining cancel messages out to the target */
1354         ctxt = llog_get_context(exp->exp_obd, LLOG_UNLINK_REPL_CTXT);
1355         llog_sync(ctxt, exp);
1356
1357         rc = class_disconnect(exp, flags);
1358         RETURN(rc);
1359 }
1360
1361 struct dentry *__filter_oa2dentry(struct obd_device *obd,
1362                                   struct obdo *oa, const char *what)
1363 {
1364         struct dentry *dchild = NULL;
1365         obd_gr group = 0;
1366
1367         if (oa->o_valid & OBD_MD_FLGROUP)
1368                 group = oa->o_gr;
1369
1370         dchild = filter_fid2dentry(obd, NULL, group, oa->o_id);
1371
1372         if (IS_ERR(dchild)) {
1373                 CERROR("%s error looking up object: "LPU64"\n", what, oa->o_id);
1374                 RETURN(dchild);
1375         }
1376
1377         if (dchild->d_inode == NULL) {
1378                 CERROR("%s on non-existent object: "LPU64"\n", what, oa->o_id);
1379                 f_dput(dchild);
1380                 RETURN(ERR_PTR(-ENOENT));
1381         }
1382
1383         return dchild;
1384 }
1385
1386 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
1387                           struct lov_stripe_md *md)
1388 {
1389         struct dentry *dentry = NULL;
1390         struct obd_device *obd;
1391         int rc = 0;
1392         ENTRY;
1393
1394         obd = class_exp2obd(exp);
1395         if (obd == NULL) {
1396                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1397                        exp->exp_handle.h_cookie);
1398                 RETURN(-EINVAL);
1399         }
1400
1401         dentry = filter_oa2dentry(obd, oa);
1402         if (IS_ERR(dentry))
1403                 RETURN(PTR_ERR(dentry));
1404
1405         /* Limit the valid bits in the return data to what we actually use */
1406         oa->o_valid = OBD_MD_FLID;
1407         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1408
1409         f_dput(dentry);
1410         RETURN(rc);
1411 }
1412
1413 /* this is called from filter_truncate() until we have filter_punch() */
1414 static int filter_setattr(struct obd_export *exp, struct obdo *oa,
1415                           struct lov_stripe_md *md, struct obd_trans_info *oti)
1416 {
1417         struct obd_run_ctxt saved;
1418         struct filter_obd *filter;
1419         struct dentry *dentry;
1420         struct iattr iattr;
1421         void *handle;
1422         int rc, rc2;
1423         ENTRY;
1424
1425         LASSERT(oti != NULL);
1426
1427         dentry = filter_oa2dentry(exp->exp_obd, oa);
1428         if (IS_ERR(dentry))
1429                 RETURN(PTR_ERR(dentry));
1430
1431         filter = &exp->exp_obd->u.filter;
1432
1433         iattr_from_obdo(&iattr, oa, oa->o_valid);
1434
1435         push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1436         lock_kernel();
1437
1438         if (iattr.ia_valid & ATTR_SIZE)
1439                 down(&dentry->d_inode->i_sem);
1440         handle = fsfilt_start(exp->exp_obd, dentry->d_inode, FSFILT_OP_SETATTR,
1441                               oti);
1442         if (IS_ERR(handle))
1443                 GOTO(out_unlock, rc = PTR_ERR(handle));
1444
1445         /* XXX this could be a rwsem instead, if filter_preprw played along */
1446         if (iattr.ia_valid & ATTR_ATTR_FLAG)
1447                 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode, NULL,
1448                                       EXT3_IOC_SETFLAGS,
1449                                       (long)&iattr.ia_attr_flags);
1450         else
1451                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1);
1452         rc = filter_finish_transno(exp, oti, rc);
1453         rc2 = fsfilt_commit(exp->exp_obd, dentry->d_inode, handle, 0);
1454         if (rc2) {
1455                 CERROR("error on commit, err = %d\n", rc2);
1456                 if (!rc)
1457                         rc = rc2;
1458         }
1459
1460         oa->o_valid = OBD_MD_FLID;
1461         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1462
1463 out_unlock:
1464         if (iattr.ia_valid & ATTR_SIZE)
1465                 up(&dentry->d_inode->i_sem);
1466         unlock_kernel();
1467         pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1468
1469         f_dput(dentry);
1470         RETURN(rc);
1471 }
1472
1473 /* XXX identical to osc_unpackmd */
1474 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
1475                            struct lov_mds_md *lmm, int lmm_bytes)
1476 {
1477         int lsm_size;
1478         ENTRY;
1479
1480         if (lmm != NULL) {
1481                 if (lmm_bytes < sizeof (*lmm)) {
1482                         CERROR("lov_mds_md too small: %d, need %d\n",
1483                                lmm_bytes, (int)sizeof(*lmm));
1484                         RETURN(-EINVAL);
1485                 }
1486                 /* XXX LOV_MAGIC etc check? */
1487
1488                 if (lmm->lmm_object_id == cpu_to_le64(0)) {
1489                         CERROR("lov_mds_md: zero lmm_object_id\n");
1490                         RETURN(-EINVAL);
1491                 }
1492         }
1493
1494         lsm_size = lov_stripe_md_size(1);
1495         if (lsmp == NULL)
1496                 RETURN(lsm_size);
1497
1498         if (*lsmp != NULL && lmm == NULL) {
1499                 OBD_FREE(*lsmp, lsm_size);
1500                 *lsmp = NULL;
1501                 RETURN(0);
1502         }
1503
1504         if (*lsmp == NULL) {
1505                 OBD_ALLOC(*lsmp, lsm_size);
1506                 if (*lsmp == NULL)
1507                         RETURN(-ENOMEM);
1508
1509                 loi_init((*lsmp)->lsm_oinfo);
1510         }
1511
1512         if (lmm != NULL) {
1513                 /* XXX zero *lsmp? */
1514                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
1515                 LASSERT((*lsmp)->lsm_object_id);
1516         }
1517
1518         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
1519
1520         RETURN(lsm_size);
1521 }
1522
1523 static void filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
1524                                       struct filter_obd *filter)
1525 {
1526         struct obdo doa; /* XXX obdo on stack */
1527         __u64 last, id;
1528         ENTRY;
1529         LASSERT(oa);
1530
1531         memset(&doa, 0, sizeof(doa));
1532         if (oa->o_valid & OBD_MD_FLGROUP)
1533                 doa.o_gr = oa->o_gr;
1534         else
1535                 doa.o_gr = 0;
1536         doa.o_mode = S_IFREG;
1537         last = filter_last_id(filter, &doa); /* FIXME: object groups */
1538         CWARN("deleting orphan objects from "LPU64" to "LPU64"\n",
1539                oa->o_id + 1, last);
1540         for (id = oa->o_id + 1; id <= last; id++) {
1541                 doa.o_id = id;
1542                 filter_destroy(exp, &doa, NULL, NULL);
1543         }
1544         spin_lock(&filter->fo_objidlock);
1545         filter->fo_last_objids[0] = oa->o_id; /* FIXME: object groups */
1546         spin_unlock(&filter->fo_objidlock);
1547         EXIT;
1548 }
1549
1550 /* returns a negative error or a nonnegative number of files to create */
1551 static int filter_should_precreate(struct obd_export *exp, struct obdo *oa,
1552                                    int group)
1553 {
1554         struct obd_device *obd = exp->exp_obd;
1555         struct filter_obd *filter = &obd->u.filter;
1556         int diff, rc;
1557         ENTRY;
1558
1559         diff = oa->o_id - filter_last_id(filter, oa);
1560         CDEBUG(D_INFO, "filter_last_id() = "LPU64" -> diff = %d\n",
1561                filter_last_id(filter, oa), diff);
1562
1563         /* delete orphans request */
1564         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
1565             (oa->o_flags & OBD_FL_DELORPHAN)) {
1566                 LASSERT(diff <= 0);
1567                 if (diff == 0)
1568                         RETURN(0);
1569                 filter_destroy_precreated(exp, oa, filter);
1570                 rc = filter_update_last_objid(obd, group, 0);
1571                 if (rc)
1572                         CERROR("unable to write lastobjid, but orphans"
1573                                "were deleted\n");
1574                 RETURN(0);
1575         } else {
1576                 /* only precreate if group == 0 and o_id is specfied */
1577                 if (!(oa->o_valid & OBD_FL_DELORPHAN) &&
1578                     (group != 0 || oa->o_id == 0))
1579                         RETURN(1);
1580
1581                 LASSERT(diff >= 0);
1582                 RETURN(diff);
1583         }
1584
1585 }
1586
1587 /* We rely on the fact that only one thread will be creating files in a given
1588  * group at a time, which is why we don't need an atomic filter_get_new_id.
1589  * Even if we had that atomic function, the following race would exist:
1590  *
1591  * thread 1: gets id x from filter_next_id
1592  * thread 2: gets id (x + 1) from filter_next_id
1593  * thread 2: creates object (x + 1)
1594  * thread 1: tries to create object x, gets -ENOSPC
1595  */
1596 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
1597                             obd_gr group, int *num)
1598 {
1599         struct lustre_handle parent_lockh;
1600         struct dentry *dchild = NULL;
1601         struct filter_obd *filter;
1602         struct dentry *dparent;
1603         int err = 0, rc = 0, i;
1604         __u64 next_id;
1605         void *handle;
1606         ENTRY;
1607
1608         filter = &obd->u.filter;
1609
1610         for (i = 0; i < *num && err == 0; i++) {
1611                 int cleanup_phase = 0;
1612
1613                 next_id = filter_last_id(filter, oa) + 1;
1614                 CDEBUG(D_INFO, "precreate objid "LPU64"\n", next_id);
1615
1616                 dparent = filter_parent_lock(obd, group, next_id, LCK_PW,
1617                                              &parent_lockh);
1618                 if (IS_ERR(dparent))
1619                         GOTO(cleanup, rc = PTR_ERR(dparent));
1620                 cleanup_phase = 1;
1621
1622                 dchild = filter_fid2dentry(obd, dparent, group, next_id);
1623                 if (IS_ERR(dchild))
1624                         GOTO(cleanup, rc = PTR_ERR(dchild));
1625                 cleanup_phase = 2;
1626
1627                 if (dchild->d_inode != NULL) {
1628                         /* This would only happen if lastobjid was bad on disk*/
1629                         CERROR("Serious error: objid %*s already exists; is "
1630                                "this filesystem corrupt?\n",
1631                                dchild->d_name.len, dchild->d_name.name);
1632                         GOTO(cleanup, rc = -EEXIST);
1633                 }
1634
1635                 handle = fsfilt_start(obd, dparent->d_inode,
1636                                       FSFILT_OP_CREATE_LOG, NULL);
1637                 if (IS_ERR(handle))
1638                         GOTO(cleanup, rc = PTR_ERR(handle));
1639                 cleanup_phase = 3;
1640
1641                 rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
1642                 if (rc) {
1643                         CERROR("create failed rc = %d\n", rc);
1644                         GOTO(cleanup, rc);
1645                 }
1646
1647                 filter_set_last_id(filter, oa, next_id);
1648                 err = filter_update_last_objid(obd, group, 0);
1649                 if (err)
1650                         CERROR("unable to write lastobjid but file created\n");
1651
1652         cleanup:
1653                 switch(cleanup_phase) {
1654                 case 3:
1655                         err = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1656                         if (err) {
1657                                 CERROR("error on commit, err = %d\n", err);
1658                                 if (!rc)
1659                                         rc = err;
1660                         }
1661                 case 2:
1662                         f_dput(dchild);
1663                 case 1:
1664                         filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1665                 case 0:
1666                         break;
1667                 }
1668
1669                 if (rc)
1670                         break;
1671         }
1672         *num = i;
1673
1674         CDEBUG(D_INFO, "filter_precreate() created %d objects\n", i);
1675         RETURN(rc);
1676 }
1677
1678 static int filter_create(struct obd_export *exp, struct obdo *oa,
1679                          struct lov_stripe_md **ea, struct obd_trans_info *oti)
1680 {
1681         struct obd_device *obd = NULL;
1682         struct obd_run_ctxt saved;
1683         struct lov_stripe_md *lsm = NULL;
1684         obd_gr group = 0;
1685         int rc = 0, diff;
1686         ENTRY;
1687
1688         if (oa->o_valid & OBD_MD_FLGROUP)
1689                 group = oa->o_gr;
1690
1691         CDEBUG(D_INFO, "filter_create(od->o_gr="LPU64",od->o_id="LPU64")\n",
1692                group, oa->o_id);
1693         if (ea != NULL) {
1694                 lsm = *ea;
1695                 if (lsm == NULL) {
1696                         rc = obd_alloc_memmd(exp, &lsm);
1697                         if (rc < 0)
1698                                 RETURN(rc);
1699                 }
1700         }
1701
1702         obd = exp->exp_obd;
1703         push_ctxt(&saved, &obd->obd_ctxt, NULL);
1704
1705         diff = filter_should_precreate(exp, oa, group);
1706         if (diff > 0) {
1707                 oa->o_id = filter_last_id(&obd->u.filter, oa);
1708                 rc = filter_precreate(obd, oa, group, &diff);
1709                 oa->o_id += diff;
1710                 oa->o_valid = OBD_MD_FLID;
1711         }
1712
1713         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1714         if (rc && ea != NULL && *ea != lsm) {
1715                 obd_free_memmd(exp, &lsm);
1716         } else if (rc == 0 && ea != NULL) {
1717                 /* XXX LOV STACKING: the lsm that is passed to us from
1718                  * LOV does not have valid lsm_oinfo data structs, so
1719                  * don't go touching that.  This needs to be fixed in a
1720                  * big way. */
1721                 lsm->lsm_object_id = oa->o_id;
1722                 *ea = lsm;
1723         }
1724
1725         RETURN(rc);
1726 }
1727
1728 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
1729                           struct lov_stripe_md *ea, struct obd_trans_info *oti)
1730 {
1731         struct obd_device *obd;
1732         struct filter_obd *filter;
1733         struct dentry *dchild = NULL, *dparent = NULL;
1734         struct obd_run_ctxt saved;
1735         void *handle = NULL;
1736         struct lustre_handle parent_lockh;
1737         struct llog_cookie *fcc = NULL;
1738         int rc, rc2, cleanup_phase = 0, have_prepared = 0;
1739         obd_gr group = 0;
1740         ENTRY;
1741
1742         if (oa->o_valid & OBD_MD_FLGROUP)
1743                 group = oa->o_gr;
1744
1745         obd = exp->exp_obd;
1746         filter = &obd->u.filter;
1747
1748         push_ctxt(&saved, &obd->obd_ctxt, NULL);
1749
1750  acquire_locks:
1751         dparent = filter_parent_lock(obd, group, oa->o_id, LCK_PW,
1752                                      &parent_lockh);
1753         if (IS_ERR(dparent))
1754                 GOTO(cleanup, rc = PTR_ERR(dparent));
1755         cleanup_phase = 1;
1756
1757         dchild = filter_fid2dentry(obd, dparent, group, oa->o_id);
1758         if (IS_ERR(dchild))
1759                 GOTO(cleanup, rc = -ENOENT);
1760         cleanup_phase = 2;
1761
1762         if (dchild->d_inode == NULL) {
1763                 CERROR("destroying non-existent object "LPU64"\n", oa->o_id);
1764                 GOTO(cleanup, rc = -ENOENT);
1765         }
1766
1767         if (!have_prepared) {
1768                 /* If we're really going to destroy the object, get ready
1769                  * by getting the clients to discard their cached data.
1770                  *
1771                  * We have to drop the parent lock, because
1772                  * filter_prepare_destroy will acquire a PW on the object, and
1773                  * we don't want to deadlock with an incoming write to the
1774                  * object, which has the extent PW and then wants to get the
1775                  * parent dentry to do the lookup.
1776                  *
1777                  * We dput the child because it's not worth the extra
1778                  * complication of condition the above code to skip it on the
1779                  * second time through. */
1780                 f_dput(dchild);
1781                 filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1782
1783                 filter_prepare_destroy(obd, oa->o_id);
1784                 have_prepared = 1;
1785                 goto acquire_locks;
1786         }
1787
1788         handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK_LOG, oti);
1789         if (IS_ERR(handle))
1790                 GOTO(cleanup, rc = PTR_ERR(handle));
1791         cleanup_phase = 3;
1792
1793         /* Our MDC connection is established by the MDS to us */
1794         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1795                 OBD_ALLOC(fcc, sizeof(*fcc));
1796                 if (fcc != NULL)
1797                         memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
1798         }
1799
1800         rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
1801
1802 cleanup:
1803         switch(cleanup_phase) {
1804         case 3:
1805                 if (fcc != NULL)
1806                         fsfilt_add_journal_cb(obd, 0, oti->oti_handle,
1807                                               filter_cancel_cookies_cb, fcc);
1808                 rc = filter_finish_transno(exp, oti, rc);
1809                 rc2 = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1810                 if (rc2) {
1811                         CERROR("error on commit, err = %d\n", rc2);
1812                         if (!rc)
1813                                 rc = rc2;
1814                 }
1815         case 2:
1816                 f_dput(dchild);
1817         case 1:
1818                 if (rc || oti == NULL) {
1819                         filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1820                 } else {
1821                         memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh,
1822                                sizeof(parent_lockh));
1823                         oti->oti_ack_locks[0].mode = LCK_PW;
1824                 }
1825         case 0:
1826                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1827                 break;
1828         default:
1829                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1830                 LBUG();
1831         }
1832
1833         RETURN(rc);
1834 }
1835
1836 /* NB start and end are used for punch, but not truncate */
1837 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
1838                            struct lov_stripe_md *lsm,
1839                            obd_off start, obd_off end,
1840                            struct obd_trans_info *oti)
1841 {
1842         int error;
1843         ENTRY;
1844
1845         if (end != OBD_OBJECT_EOF)
1846                 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
1847                        end);
1848
1849         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = %x, "
1850                "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
1851         oa->o_size = start;
1852         error = filter_setattr(exp, oa, NULL, oti);
1853         RETURN(error);
1854 }
1855
1856 static int filter_sync(struct obd_export *exp, struct obdo *oa,
1857                        struct lov_stripe_md *lsm, obd_off start, obd_off end)
1858 {
1859         struct obd_run_ctxt saved;
1860         struct filter_obd *filter;
1861         struct dentry *dentry;
1862         int rc, rc2;
1863         ENTRY;
1864
1865         filter = &exp->exp_obd->u.filter;
1866
1867         /* an objid of zero is taken to mean "sync whole filesystem" */
1868         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
1869                 rc = fsfilt_sync(exp->exp_obd, filter->fo_sb);
1870                 RETURN(rc);
1871         }
1872
1873         dentry = filter_oa2dentry(exp->exp_obd, oa);
1874         if (IS_ERR(dentry))
1875                 RETURN(PTR_ERR(dentry));
1876
1877         push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1878
1879         down(&dentry->d_inode->i_sem);
1880         rc = filemap_fdatasync(dentry->d_inode->i_mapping);
1881         if (rc == 0) {
1882                 /* just any file to grab fsync method - "file" arg unused */
1883                 struct file *file = filter->fo_rcvd_filp;
1884
1885                 if (file->f_op && file->f_op->fsync)
1886                         rc = file->f_op->fsync(NULL, dentry, 1);
1887
1888                 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
1889                 if (!rc)
1890                         rc = rc2;
1891         }
1892         up(&dentry->d_inode->i_sem);
1893
1894         oa->o_valid = OBD_MD_FLID;
1895         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1896
1897         pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1898
1899         f_dput(dentry);
1900         RETURN(rc);
1901 }
1902
1903 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1904                          unsigned long max_age)
1905 {
1906         ENTRY;
1907         RETURN(fsfilt_statfs(obd, obd->u.filter.fo_sb, osfs));
1908 }
1909
1910 static int filter_get_info(struct obd_export *exp, __u32 keylen,
1911                            void *key, __u32 *vallen, void *val)
1912 {
1913         struct obd_device *obd;
1914         ENTRY;
1915
1916         obd = class_exp2obd(exp);
1917         if (obd == NULL) {
1918                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1919                        exp->exp_handle.h_cookie);
1920                 RETURN(-EINVAL);
1921         }
1922
1923         if (keylen == strlen("blocksize") &&
1924             memcmp(key, "blocksize", keylen) == 0) {
1925                 __u32 *blocksize = val;
1926                 *vallen = sizeof(*blocksize);
1927                 *blocksize = obd->u.filter.fo_sb->s_blocksize;
1928                 RETURN(0);
1929         }
1930
1931         if (keylen == strlen("blocksize_bits") &&
1932             memcmp(key, "blocksize_bits", keylen) == 0) {
1933                 __u32 *blocksize_bits = val;
1934                 *vallen = sizeof(*blocksize_bits);
1935                 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
1936                 RETURN(0);
1937         }
1938
1939         if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
1940                 obd_id *last_id = val;
1941                 /* FIXME: object groups */
1942                 *last_id = filter_last_id(&obd->u.filter, 0);
1943                 RETURN(0);
1944         }
1945         CDEBUG(D_IOCTL, "invalid key\n");
1946         RETURN(-EINVAL);
1947 }
1948
1949 static int filter_set_info(struct obd_export *exp, __u32 keylen,
1950                            void *key, __u32 vallen, void *val)
1951 {
1952         struct obd_device *obd;
1953         struct lustre_handle conn;
1954 #ifdef ENABLE_ORPHANS
1955         struct llog_ctxt *ctxt;
1956 #endif
1957         int rc = 0;
1958         ENTRY;
1959
1960         conn.cookie = exp->exp_handle.h_cookie;
1961
1962         obd = exp->exp_obd;
1963         if (obd == NULL) {
1964                 CDEBUG(D_IOCTL, "invalid exp %p cookie "LPX64"\n",
1965                        exp, conn.cookie);
1966                 RETURN(-EINVAL);
1967         }
1968
1969         if (keylen < strlen("mds_conn") ||
1970             memcmp(key, "mds_conn", keylen) != 0)
1971                 RETURN(-EINVAL);
1972
1973         CWARN("Received MDS connection ("LPX64")\n", conn.cookie);
1974         memcpy(&obd->u.filter.fo_mdc_conn, &conn, sizeof(conn));
1975 #ifdef ENABLE_ORPHANS
1976         ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
1977         rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
1978 #endif
1979         RETURN(rc);
1980 }
1981
1982 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
1983                      int len, void *karg, void *uarg)
1984 {
1985         struct obd_device *obd = exp->exp_obd;
1986         struct obd_ioctl_data *data = karg;
1987         int rc = 0;
1988
1989         switch (cmd) {
1990         case OBD_IOC_ABORT_RECOVERY:
1991                 CERROR("aborting recovery for device %s\n", obd->obd_name);
1992                 target_abort_recovery(obd);
1993                 RETURN(0);
1994
1995         case OBD_IOC_SET_READONLY: {
1996                 void *handle;
1997                 struct super_block *sb = obd->u.filter.fo_sb;
1998                 struct inode *inode = sb->s_root->d_inode;
1999                 BDEVNAME_DECLARE_STORAGE(tmp);
2000                 CERROR("setting device %s read-only\n",
2001                        ll_bdevname(sb, tmp));
2002
2003                 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
2004                 LASSERT(handle);
2005                 (void)fsfilt_commit(obd, inode, handle, 1);
2006
2007                 dev_set_rdonly(ll_sbdev(obd->u.filter.fo_sb), 2);
2008                 RETURN(0);
2009         }
2010
2011         case OBD_IOC_CATLOGLIST: {
2012                 rc = llog_catlog_list(obd, 1, data);
2013                 RETURN(rc);
2014         }
2015
2016         case OBD_IOC_LLOG_CANCEL:
2017         case OBD_IOC_LLOG_REMOVE:
2018         case OBD_IOC_LLOG_INFO:
2019         case OBD_IOC_LLOG_PRINT: {
2020                 /* FIXME to be finished */
2021                 RETURN(-EOPNOTSUPP);
2022 /*
2023                 struct llog_ctxt *ctxt = NULL;
2024
2025                 push_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2026                 rc = llog_ioctl(ctxt, cmd, data);
2027                 pop_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2028
2029                 RETURN(rc);
2030 */
2031         }
2032
2033
2034         default:
2035                 RETURN(-EINVAL);
2036         }
2037         RETURN(0);
2038 }
2039
2040 static struct llog_operations filter_unlink_repl_logops;
2041 static struct llog_operations filter_size_orig_logops = {
2042         lop_setup: llog_obd_origin_setup,
2043         lop_cleanup: llog_obd_origin_cleanup,
2044         lop_add: llog_obd_origin_add
2045 };
2046
2047 static int filter_llog_init(struct obd_device *obd, struct obd_device *tgt,
2048                             int count, struct llog_logid *logid)
2049 {
2050         struct llog_ctxt *ctxt;
2051         int rc;
2052         ENTRY;
2053
2054         filter_unlink_repl_logops = llog_client_ops;
2055         filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
2056         filter_unlink_repl_logops.lop_connect = llog_repl_connect;
2057         filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
2058
2059         rc = llog_setup(obd, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
2060                         &filter_unlink_repl_logops);
2061         if (rc)
2062                 RETURN(rc);
2063         /* FIXME - assign unlink_cb for filter's recovery */
2064         ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
2065         ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
2066
2067         rc = llog_setup(obd, LLOG_SIZE_ORIG_CTXT, tgt, 0, NULL,
2068                         &filter_size_orig_logops);
2069         RETURN(rc);
2070 }
2071
2072 static int filter_llog_finish(struct obd_device *obd, int count)
2073 {
2074         int rc;
2075         ENTRY;
2076
2077         rc = llog_cleanup(llog_get_context(obd, LLOG_UNLINK_REPL_CTXT));
2078         if (rc)
2079                 RETURN(rc);
2080
2081         rc = llog_cleanup(llog_get_context(obd, LLOG_SIZE_ORIG_CTXT));
2082         RETURN(rc);
2083 }
2084
2085 static struct dentry *filter_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr,
2086                                              void *data)
2087 {
2088         return filter_fid2dentry(data, NULL, gr, id);
2089 }
2090
2091 static struct lvfs_callback_ops filter_lvfs_ops = {
2092         l_fid2dentry:     filter_lvfs_fid2dentry,
2093 };
2094
2095 static struct obd_ops filter_obd_ops = {
2096         o_owner:          THIS_MODULE,
2097         o_attach:         filter_attach,
2098         o_detach:         filter_detach,
2099         o_get_info:       filter_get_info,
2100         o_set_info:       filter_set_info,
2101         o_setup:          filter_setup,
2102         o_postsetup:      filter_postsetup,
2103         o_precleanup:     filter_precleanup,
2104         o_cleanup:        filter_cleanup,
2105         o_connect:        filter_connect,
2106         o_disconnect:     filter_disconnect,
2107         o_statfs:         filter_statfs,
2108         o_getattr:        filter_getattr,
2109         o_unpackmd:       filter_unpackmd,
2110         o_create:         filter_create,
2111         o_setattr:        filter_setattr,
2112         o_destroy:        filter_destroy,
2113         o_brw:            filter_brw,
2114         o_punch:          filter_truncate,
2115         o_sync:           filter_sync,
2116         o_preprw:         filter_preprw,
2117         o_commitrw:       filter_commitrw,
2118         o_destroy_export: filter_destroy_export,
2119         o_llog_init:      filter_llog_init,
2120         o_llog_finish:    filter_llog_finish,
2121         o_iocontrol:      filter_iocontrol,
2122 };
2123
2124 static struct obd_ops filter_sanobd_ops = {
2125         o_owner:          THIS_MODULE,
2126         o_attach:         filter_attach,
2127         o_detach:         filter_detach,
2128         o_get_info:       filter_get_info,
2129         o_set_info:       filter_set_info,
2130         o_setup:          filter_san_setup,
2131         o_precleanup:     filter_precleanup,
2132         o_cleanup:        filter_cleanup,
2133         o_connect:        filter_connect,
2134         o_disconnect:     filter_disconnect,
2135         o_statfs:         filter_statfs,
2136         o_getattr:        filter_getattr,
2137         o_unpackmd:       filter_unpackmd,
2138         o_create:         filter_create,
2139         o_setattr:        filter_setattr,
2140         o_destroy:        filter_destroy,
2141         o_brw:            filter_brw,
2142         o_punch:          filter_truncate,
2143         o_sync:           filter_sync,
2144         o_preprw:         filter_preprw,
2145         o_commitrw:       filter_commitrw,
2146         o_san_preprw:     filter_san_preprw,
2147         o_destroy_export: filter_destroy_export,
2148         o_llog_init:      filter_llog_init,
2149         o_llog_finish:    filter_llog_finish,
2150         o_iocontrol:      filter_iocontrol,
2151 };
2152
2153 static int __init obdfilter_init(void)
2154 {
2155         struct lprocfs_static_vars lvars;
2156         int rc;
2157
2158         printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
2159
2160         lprocfs_init_vars(filter, &lvars);
2161
2162         rc = class_register_type(&filter_obd_ops, lvars.module_vars,
2163                                  OBD_FILTER_DEVICENAME);
2164         if (rc)
2165                 return rc;
2166
2167         rc = class_register_type(&filter_sanobd_ops, lvars.module_vars,
2168                                  OBD_FILTER_SAN_DEVICENAME);
2169         if (rc)
2170                 class_unregister_type(OBD_FILTER_DEVICENAME);
2171         return rc;
2172 }
2173
2174 static void __exit obdfilter_exit(void)
2175 {
2176         class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
2177         class_unregister_type(OBD_FILTER_DEVICENAME);
2178 }
2179
2180 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2181 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
2182 MODULE_LICENSE("GPL");
2183
2184 module_init(obdfilter_init);
2185 module_exit(obdfilter_exit);