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 #include <linux/jbd.h>
  45 #include <linux/ext3_fs.h>
  46 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  47 # include <linux/mount.h>
  48 # include <linux/buffer_head.h>
  49 # include <linux/bio.h>
  50 #endif
  51
  52 #include <linux/obd_class.h>
  53 #include <linux/obd_lov.h>
  54 #include <linux/obd_ost.h>
  55 #include <linux/lustre_dlm.h>
  56 #include <linux/lustre_fsfilt.h>
  57 #include <linux/lprocfs_status.h>
  58 #include <linux/lustre_log.h>
  59 #include <linux/lustre_commit_confd.h>
  60 #include <libcfs/list.h>
  61
  62 #include <linux/lustre_smfs.h>
  63 #include <linux/lustre_sec.h>
  64 #include "filter_internal.h"
  65
  66 /* Group 0 is no longer a legal group, to catch uninitialized IDs */
  67 #define FILTER_MIN_GROUPS 3
  68
  69 static struct lvfs_callback_ops filter_lvfs_ops;
  70
  71 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
  72                           struct lov_stripe_md *ea, struct obd_trans_info *);
  73 struct obd_llogs *filter_grab_llog_for_group(struct obd_device *,
  74                                              int, struct obd_export *);
  75
  76 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
  77                              void *cb_data, int error)
  78 {
  79         obd_transno_commit_cb(obd, transno, error);
  80 }
  81
  82 /* Assumes caller has already pushed us into the kernel context. */
  83 int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
  84                           int rc)
  85 {
  86         struct filter_obd *filter = &exp->exp_obd->u.filter;
  87         struct filter_export_data *fed = &exp->exp_filter_data;
  88         struct filter_client_data *fcd = fed->fed_fcd;
  89         __u64 last_rcvd;
  90         loff_t off;
  91         int err, log_pri = D_HA;
  92
  93         /* Propagate error code. */
  94         if (rc)
  95                 RETURN(rc);
  96
  97         if (!exp->exp_obd->obd_replayable || oti == NULL)
  98                 RETURN(rc);
  99
 100         /* we don't allocate new transnos for replayed requests */
 101         if (oti->oti_transno == 0) {
 102                 spin_lock(&filter->fo_translock);
 103                 last_rcvd = le64_to_cpu(filter->fo_fsd->fsd_last_transno) + 1;
 104                 filter->fo_fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
 105                 spin_unlock(&filter->fo_translock);
 106                 oti->oti_transno = last_rcvd;
 107         } else {
 108                 spin_lock(&filter->fo_translock);
 109                 last_rcvd = oti->oti_transno;
 110                 if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno))
 111                         filter->fo_fsd->fsd_last_transno =
 112                                 cpu_to_le64(last_rcvd);
 113                 spin_unlock(&filter->fo_translock);
 114         }
 115
 116         fcd->fcd_last_rcvd = cpu_to_le64(last_rcvd);
 117
 118         /* could get xid from oti, if it's ever needed */
 119         fcd->fcd_last_xid = 0;
 120
 121         off = fed->fed_lr_off;
 122
 123         fsfilt_add_journal_cb(exp->exp_obd, filter->fo_sb, last_rcvd,
 124                               oti->oti_handle, filter_commit_cb, NULL);
 125
 126         err = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp, fcd,
 127                                   sizeof(*fcd), &off, 0);
 128         if (err) {
 129                 log_pri = D_ERROR;
 130                 if (rc == 0)
 131                         rc = err;
 132         }
 133
 134         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
 135                last_rcvd, fcd->fcd_uuid, fed->fed_lr_idx, err);
 136
 137         RETURN(rc);
 138 }
 139
 140 void f_dput(struct dentry *dentry)
 141 {
 142         /* Can't go inside filter_ddelete because it can block */
 143         CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
 144                dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
 145         LASSERT(atomic_read(&dentry->d_count) > 0);
 146
 147         dput(dentry);
 148 }
 149
 150 /* Add client data to the FILTER.  We use a bitmap to locate a free space
 151  * in the last_rcvd file if cl_idx is -1 (i.e. a new client).
 152  * Otherwise, we have just read the data from the last_rcvd file and
 153  * we know its offset. */
 154 static int filter_client_add(struct obd_device *obd, struct filter_obd *filter,
 155                              struct filter_export_data *fed, int cl_idx)
 156 {
 157         unsigned long *bitmap = filter->fo_last_rcvd_slots;
 158         int new_client = (cl_idx == -1);
 159         ENTRY;
 160
 161         LASSERT(bitmap != NULL);
 162
 163         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 164         if (!strcmp((char *)fed->fed_fcd->fcd_uuid, (char *)obd->obd_uuid.uuid))
 165                 RETURN(0);
 166
 167         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 168          * there's no need for extra complication here
 169          */
 170         if (new_client) {
 171                 cl_idx = find_first_zero_bit(bitmap, FILTER_LR_MAX_CLIENTS);
 172         repeat:
 173                 if (cl_idx >= FILTER_LR_MAX_CLIENTS) {
 174                         CERROR("no client slots - fix FILTER_LR_MAX_CLIENTS\n");
 175                         RETURN(-ENOMEM);
 176                 }
 177                 if (test_and_set_bit(cl_idx, bitmap)) {
 178                         CERROR("FILTER client %d: found bit is set in bitmap\n",
 179                                cl_idx);
 180                         cl_idx = find_next_zero_bit(bitmap,
 181                                                     FILTER_LR_MAX_CLIENTS,
 182                                                     cl_idx);
 183                         goto repeat;
 184                 }
 185         } else {
 186                 if (test_and_set_bit(cl_idx, bitmap)) {
 187                         CERROR("FILTER client %d: bit already set in bitmap!\n",
 188                                cl_idx);
 189                         LBUG();
 190                 }
 191         }
 192
 193         fed->fed_lr_idx = cl_idx;
 194         fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->fsd_client_start) +
 195                 cl_idx * le16_to_cpu(filter->fo_fsd->fsd_client_size);
 196
 197         CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
 198                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
 199
 200         if (new_client) {
 201                 struct lvfs_run_ctxt saved;
 202                 loff_t off = fed->fed_lr_off;
 203                 int err;
 204                 void *handle;
 205
 206                 CDEBUG(D_INFO, "writing client fcd at idx %u (%llu) (len %u)\n",
 207                        fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_fcd));
 208
 209                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 210                 /* Transaction needed to fix bug 1403 */
 211                 handle = fsfilt_start(obd,
 212                                       filter->fo_rcvd_filp->f_dentry->d_inode,
 213                                       FSFILT_OP_SETATTR, NULL);
 214                 if (IS_ERR(handle)) {
 215                         err = PTR_ERR(handle);
 216                         CERROR("unable to start transaction: rc %d\n", err);
 217                 } else {
 218                         err = fsfilt_write_record(obd, filter->fo_rcvd_filp,
 219                                                   fed->fed_fcd,
 220                                                   sizeof(*fed->fed_fcd),
 221                                                   &off, 1);
 222                         fsfilt_commit(obd, filter->fo_sb,
 223                                       filter->fo_rcvd_filp->f_dentry->d_inode,
 224                                       handle, 1);
 225                 }
 226                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 227
 228                 if (err) {
 229                         CERROR("error writing %s client idx %u: rc %d\n",
 230                                LAST_RCVD, fed->fed_lr_idx, err);
 231                         RETURN(err);
 232                 }
 233         }
 234         RETURN(0);
 235 }
 236
 237 static int filter_client_free(struct obd_export *exp, int flags)
 238 {
 239         struct filter_export_data *fed = &exp->exp_filter_data;
 240         struct filter_obd *filter = &exp->exp_obd->u.filter;
 241         struct obd_device *obd = exp->exp_obd;
 242         struct filter_client_data zero_fcd;
 243         struct lvfs_run_ctxt saved;
 244         int rc;
 245         loff_t off;
 246         ENTRY;
 247
 248         if (fed->fed_fcd == NULL)
 249                 RETURN(0);
 250
 251         if (flags & OBD_OPT_FAILOVER)
 252                 GOTO(free, 0);
 253
 254         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 255         if (!strcmp((char *)fed->fed_fcd->fcd_uuid, (char *)obd->obd_uuid.uuid))
 256                 GOTO(free, 0);
 257
 258         LASSERT(filter->fo_last_rcvd_slots != NULL);
 259
 260         off = fed->fed_lr_off;
 261
 262         CDEBUG(D_INFO, "freeing client at idx %u (%lld) with UUID '%s'\n",
 263                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
 264
 265         /* Clear the bit _after_ zeroing out the client so we don't
 266            race with filter_client_add and zero out new clients.*/
 267         if (!test_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
 268                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
 269                        fed->fed_lr_idx);
 270                 LBUG();
 271         }
 272
 273         memset(&zero_fcd, 0, sizeof zero_fcd);
 274         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 275         rc = fsfilt_write_record(obd, filter->fo_rcvd_filp, &zero_fcd,
 276                                  sizeof(zero_fcd), &off, 1);
 277         if (rc == 0)
 278                 /* update server's transno */
 279                 filter_update_server_data(obd, filter->fo_rcvd_filp,
 280                                           filter->fo_fsd, 1);
 281         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 282
 283         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 284                "zeroing disconnecting client %s at idx %u (%llu) in %s rc %d\n",
 285                fed->fed_fcd->fcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
 286                LAST_RCVD, rc);
 287
 288         if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
 289                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
 290                        fed->fed_lr_idx);
 291                 LBUG();
 292         }
 293
 294 free:
 295         OBD_FREE(fed->fed_fcd, sizeof(*fed->fed_fcd));
 296
 297         RETURN(0);
 298 }
 299
 300 static int filter_free_server_data(struct filter_obd *filter)
 301 {
 302         OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
 303         filter->fo_fsd = NULL;
 304         OBD_FREE(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENTS/8);
 305         filter->fo_last_rcvd_slots = NULL;
 306         return 0;
 307 }
 308
 309 /* assumes caller is already in kernel ctxt */
 310 int filter_update_server_data(struct obd_device *obd, struct file *filp,
 311                               struct filter_server_data *fsd, int force_sync)
 312 {
 313         loff_t off = 0;
 314         int rc;
 315         ENTRY;
 316
 317         CDEBUG(D_INODE, "server uuid      : %s\n", fsd->fsd_uuid);
 318         CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
 319                le64_to_cpu(fsd->fsd_last_transno));
 320         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
 321                le64_to_cpu(fsd->fsd_mount_count));
 322
 323         rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off,force_sync);
 324         if (rc)
 325                 CERROR("error writing filter_server_data: rc = %d\n", rc);
 326
 327         RETURN(rc);
 328 }
 329
 330 int filter_update_last_objid(struct obd_device *obd, obd_gr group,
 331                              int force_sync)
 332 {
 333         struct filter_obd *filter = &obd->u.filter;
 334         __u64 tmp;
 335         loff_t off = 0;
 336         int rc;
 337         ENTRY;
 338
 339         if (filter->fo_last_objid_files[group] == NULL) {
 340                 CERROR("Object group "LPU64" not fully setup; not updating "
 341                        "last_objid\n", group);
 342                 RETURN(0);
 343         }
 344
 345         CDEBUG(D_INODE, "server last_objid for group "LPU64": "LPU64"\n",
 346                group, filter->fo_last_objids[group]);
 347
 348         tmp = cpu_to_le64(filter->fo_last_objids[group]);
 349         rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
 350                                  &tmp, sizeof(tmp), &off, force_sync);
 351         if (rc)
 352                 CERROR("error writing group "LPU64" last objid: rc = %d\n",
 353                        group, rc);
 354         RETURN(rc);
 355 }
 356
 357 /* assumes caller has already in kernel ctxt */
 358 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
 359 {
 360         struct filter_obd *filter = &obd->u.filter;
 361         struct filter_server_data *fsd;
 362         struct filter_client_data *fcd = NULL;
 363         struct inode *inode = filp->f_dentry->d_inode;
 364         unsigned long last_rcvd_size = inode->i_size;
 365         __u64 mount_count;
 366         int cl_idx;
 367         loff_t off = 0;
 368         int rc;
 369
 370         /* ensure padding in the struct is the correct size */
 371         LASSERT (offsetof(struct filter_server_data, fsd_padding) +
 372                  sizeof(fsd->fsd_padding) == FILTER_LR_SERVER_SIZE);
 373         LASSERT (offsetof(struct filter_client_data, fcd_padding) +
 374                  sizeof(fcd->fcd_padding) == FILTER_LR_CLIENT_SIZE);
 375
 376         OBD_ALLOC(fsd, sizeof(*fsd));
 377         if (!fsd)
 378                 RETURN(-ENOMEM);
 379         filter->fo_fsd = fsd;
 380
 381         OBD_ALLOC(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENTS/8);
 382         if (filter->fo_last_rcvd_slots == NULL) {
 383                 OBD_FREE(fsd, sizeof(*fsd));
 384                 RETURN(-ENOMEM);
 385         }
 386
 387         if (last_rcvd_size == 0) {
 388                 CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD);
 389
 390                 memcpy(fsd->fsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->fsd_uuid));
 391                 fsd->fsd_last_transno = 0;
 392                 mount_count = fsd->fsd_mount_count = 0;
 393                 fsd->fsd_server_size = cpu_to_le32(FILTER_LR_SERVER_SIZE);
 394                 fsd->fsd_client_start = cpu_to_le32(FILTER_LR_CLIENT_START);
 395                 fsd->fsd_client_size = cpu_to_le16(FILTER_LR_CLIENT_SIZE);
 396                 fsd->fsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
 397                 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
 398         } else {
 399                 rc = fsfilt_read_record(obd, filp, fsd, sizeof(*fsd), &off);
 400                 if (rc) {
 401                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 402                                LAST_RCVD, rc);
 403                         GOTO(err_fsd, rc);
 404                 }
 405                 if (strcmp((char *)fsd->fsd_uuid, (char *)obd->obd_uuid.uuid)) {
 406                         CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
 407                                obd->obd_uuid.uuid, fsd->fsd_uuid);
 408                         GOTO(err_fsd, rc = -EINVAL);
 409                 }
 410                 mount_count = le64_to_cpu(fsd->fsd_mount_count);
 411                 filter->fo_subdir_count = le16_to_cpu(fsd->fsd_subdir_count);
 412         }
 413
 414         if (fsd->fsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
 415                 CERROR("unsupported feature %x\n",
 416                        le32_to_cpu(fsd->fsd_feature_incompat) &
 417                        ~FILTER_INCOMPAT_SUPP);
 418                 GOTO(err_fsd, rc = -EINVAL);
 419         }
 420         if (fsd->fsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
 421                 CERROR("read-only feature %x\n",
 422                        le32_to_cpu(fsd->fsd_feature_rocompat) &
 423                        ~FILTER_ROCOMPAT_SUPP);
 424                 /* Do something like remount filesystem read-only */
 425                 GOTO(err_fsd, rc = -EINVAL);
 426         }
 427
 428         CDEBUG(D_INODE, "%s: server last_rcvd : "LPU64"\n",
 429                obd->obd_name, le64_to_cpu(fsd->fsd_last_transno));
 430         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 431                obd->obd_name, mount_count + 1);
 432         CDEBUG(D_INODE, "%s: server data size: %u\n",
 433                obd->obd_name, le32_to_cpu(fsd->fsd_server_size));
 434         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 435                obd->obd_name, le32_to_cpu(fsd->fsd_client_start));
 436         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 437                obd->obd_name, le32_to_cpu(fsd->fsd_client_size));
 438         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
 439                obd->obd_name, le16_to_cpu(fsd->fsd_subdir_count));
 440         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 441                last_rcvd_size <= le32_to_cpu(fsd->fsd_client_start) ? 0 :
 442                (last_rcvd_size - le32_to_cpu(fsd->fsd_client_start)) /
 443                 le16_to_cpu(fsd->fsd_client_size));
 444
 445         if (!obd->obd_replayable) {
 446                 CWARN("%s: recovery support OFF\n", obd->obd_name);
 447                 GOTO(out, rc = 0);
 448         }
 449
 450         for (cl_idx = 0, off = le32_to_cpu(fsd->fsd_client_start);
 451              off < last_rcvd_size; cl_idx++) {
 452                 __u64 last_rcvd;
 453                 struct obd_export *exp;
 454                 struct filter_export_data *fed;
 455
 456                 if (!fcd) {
 457                         OBD_ALLOC(fcd, sizeof(*fcd));
 458                         if (!fcd)
 459                                 GOTO(err_client, rc = -ENOMEM);
 460                 }
 461
 462                 /* Don't assume off is incremented properly by
 463                  * fsfilt_read_record(), in case sizeof(*fcd)
 464                  * isn't the same as fsd->fsd_client_size.  */
 465                 off = le32_to_cpu(fsd->fsd_client_start) +
 466                         cl_idx * le16_to_cpu(fsd->fsd_client_size);
 467                 rc = fsfilt_read_record(obd, filp, fcd, sizeof(*fcd), &off);
 468                 if (rc) {
 469                         CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
 470                                LAST_RCVD, cl_idx, off, rc);
 471                         break; /* read error shouldn't cause startup to fail */
 472                 }
 473
 474                 if (fcd->fcd_uuid[0] == '\0') {
 475                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 476                                cl_idx);
 477                         continue;
 478                 }
 479
 480                 last_rcvd = le64_to_cpu(fcd->fcd_last_rcvd);
 481
 482                 /* These exports are cleaned up by filter_disconnect(), so they
 483                  * need to be set up like real exports as filter_connect() does.
 484                  */
 485                 exp = class_new_export(obd);
 486                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64" "
 487                        "srv lr: "LPU64" fcd_group %d \n", fcd->fcd_uuid, cl_idx,
 488                        last_rcvd, le64_to_cpu(fsd->fsd_last_transno),
 489                        le32_to_cpu(fcd->fcd_group));
 490                 if (exp == NULL)
 491                         GOTO(err_client, rc = -ENOMEM);
 492
 493                 memcpy(&exp->exp_client_uuid.uuid, fcd->fcd_uuid,
 494                        sizeof exp->exp_client_uuid.uuid);
 495                 fed = &exp->exp_filter_data;
 496                 fed->fed_fcd = fcd;
 497                 fed->fed_group = le32_to_cpu(fcd->fcd_group);
 498                 filter_client_add(obd, filter, fed, cl_idx);
 499                 /* create helper if export init gets more complex */
 500                 spin_lock_init(&fed->fed_lock);
 501
 502                 fcd = NULL;
 503                 exp->exp_connected = 0;
 504                 exp->exp_req_replay_needed = 1;
 505                 exp->exp_lock_replay_needed = 1;
 506                 atomic_inc(&obd->obd_req_replay_clients);
 507                 atomic_inc(&obd->obd_lock_replay_clients);
 508                 obd->obd_recoverable_clients++;
 509                 obd->obd_max_recoverable_clients++;
 510                 class_export_put(exp);
 511
 512                 CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
 513                        cl_idx, last_rcvd);
 514
 515                 if (last_rcvd > le64_to_cpu(fsd->fsd_last_transno))
 516                         fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
 517
 518         }
 519
 520         obd->obd_last_committed = le64_to_cpu(fsd->fsd_last_transno);
 521
 522         if (obd->obd_recoverable_clients) {
 523                 CWARN("RECOVERY: service %s, %d recoverable clients, "
 524                       "last_transno "LPU64"\n", obd->obd_name,
 525                       obd->obd_recoverable_clients,
 526                       le64_to_cpu(fsd->fsd_last_transno));
 527                 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
 528                 target_start_recovery_thread(obd, ost_handle);
 529         }
 530
 531         if (fcd)
 532                 OBD_FREE(fcd, sizeof(*fcd));
 533
 534 out:
 535         filter->fo_mount_count = mount_count + 1;
 536         fsd->fsd_mount_count = cpu_to_le64(filter->fo_mount_count);
 537
 538         /* save it, so mount count and last_transno is current */
 539         rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
 540         if (rc)
 541                 GOTO(err_client, rc);
 542         RETURN(0);
 543
 544 err_client:
 545         class_disconnect_exports(obd, 0);
 546 err_fsd:
 547         filter_free_server_data(filter);
 548         RETURN(rc);
 549 }
 550
 551 static int filter_cleanup_groups(struct obd_device *obd)
 552 {
 553         struct filter_obd *filter = &obd->u.filter;
 554         struct dentry *dentry;
 555         int i, k;
 556         ENTRY;
 557
 558         for (i = 0; i < filter->fo_group_count; i++) {
 559                 if (filter->fo_subdirs != NULL) {
 560                         for (k = 0; k < filter->fo_subdir_count; k++) {
 561                                 dentry = filter->fo_subdirs[i].dentry[k];
 562                                 if (dentry == NULL)
 563                                         continue;
 564                                 f_dput(dentry);
 565                                 filter->fo_subdirs[i].dentry[k] = NULL;
 566                         }
 567                 }
 568                 if (filter->fo_last_objid_files[i] != NULL) {
 569                         filp_close(filter->fo_last_objid_files[i], 0);
 570                         filter->fo_last_objid_files[i] = NULL;
 571                 }
 572                 if (filter->fo_groups[i] != NULL) {
 573                         dput(filter->fo_groups[i]);
 574                         filter->fo_groups[i] = NULL;
 575                 }
 576         }
 577         if (filter->fo_subdirs != NULL)
 578                 OBD_FREE(filter->fo_subdirs,
 579                          filter->fo_group_count * sizeof(*filter->fo_subdirs));
 580         if (filter->fo_groups != NULL)
 581                 OBD_FREE(filter->fo_groups,
 582                          filter->fo_group_count * sizeof(*filter->fo_groups));
 583         if (filter->fo_last_objids != NULL)
 584                 OBD_FREE(filter->fo_last_objids,
 585                          filter->fo_group_count * sizeof(__u64));
 586         if (filter->fo_last_objid_files != NULL)
 587                 OBD_FREE(filter->fo_last_objid_files,
 588                          filter->fo_group_count * sizeof(struct file *));
 589         f_dput(filter->fo_dentry_O);
 590         RETURN(0);
 591 }
 592
 593 static int filter_update_last_group(struct obd_device *obd, int group)
 594 {
 595         struct filter_obd *filter = &obd->u.filter;
 596         struct file *filp = NULL;
 597         int last_group = 0, rc;
 598         loff_t off = 0;
 599         ENTRY;
 600
 601         if (group <= filter->fo_committed_group)
 602                 RETURN(0);
 603
 604         filp = filp_open("LAST_GROUP", O_RDWR, 0700);
 605         if (IS_ERR(filp)) {
 606                 rc = PTR_ERR(filp);
 607                 filp = NULL;
 608                 CERROR("cannot open LAST_GROUP: rc = %d\n", rc);
 609                 GOTO(cleanup, rc);
 610         }
 611
 612         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
 613         if (rc) {
 614                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n",rc);
 615                 GOTO(cleanup, rc);
 616         }
 617         LASSERT(off == 0 || last_group >= FILTER_MIN_GROUPS);
 618         CDEBUG(D_INODE, "%s: previous %d, new %d\n",
 619                obd->obd_name, last_group, group);
 620
 621         off = 0;
 622         last_group = group;
 623         /* must be sync: bXXXX */
 624         rc = fsfilt_write_record(obd, filp, &last_group, sizeof(__u32), &off, 1);
 625         if (rc) {
 626                 CDEBUG(D_INODE, "error updating LAST_GROUP: rc %d\n", rc);
 627                 GOTO(cleanup, rc);
 628         }
 629
 630         filter->fo_committed_group = group;
 631 cleanup:
 632         if (filp)
 633                 filp_close(filp, 0);
 634         RETURN(rc);
 635 }
 636
 637 static int filter_read_group_internal(struct obd_device *obd, int group,
 638                                       int create)
 639 {
 640         struct filter_obd *filter = &obd->u.filter;
 641         __u64 *new_objids = NULL;
 642         struct filter_subdirs *new_subdirs = NULL, *tmp_subdirs = NULL;
 643         struct dentry **new_groups = NULL;
 644         struct file **new_files = NULL;
 645         struct dentry *dentry;
 646         struct file *filp;
 647         int old_count = filter->fo_group_count, rc, stage = 0, i;
 648         char name[25];
 649         __u64 last_objid;
 650         loff_t off = 0;
 651
 652         snprintf(name, 24, "%d", group);
 653         name[24] = '\0';
 654
 655         if (!create) {
 656                 dentry = ll_lookup_one_len(name, filter->fo_dentry_O,
 657                                            strlen(name));
 658                 if (IS_ERR(dentry)) {
 659                         CERROR("Cannot lookup expected object group %d: %ld\n",
 660                                group, PTR_ERR(dentry));
 661                         RETURN(PTR_ERR(dentry));
 662                 }
 663         } else {
 664                 dentry = simple_mkdir(filter->fo_dentry_O, name, 0700, 1);
 665                 if (IS_ERR(dentry)) {
 666                         CERROR("cannot lookup/create O/%s: rc = %ld\n", name,
 667                                PTR_ERR(dentry));
 668                         RETURN(PTR_ERR(dentry));
 669                 }
 670         }
 671         stage = 1;
 672
 673         snprintf(name, 24, "O/%d/LAST_ID", group);
 674         name[24] = '\0';
 675         filp = filp_open(name, O_CREAT | O_RDWR, 0700);
 676         if (IS_ERR(filp)) {
 677                 CERROR("cannot create %s: rc = %ld\n", name, PTR_ERR(filp));
 678                 GOTO(cleanup, rc = PTR_ERR(filp));
 679         }
 680         stage = 2;
 681
 682         rc = fsfilt_read_record(obd, filp, &last_objid, sizeof(__u64), &off);
 683         if (rc) {
 684                 CDEBUG(D_INODE, "error reading %s: rc %d\n", name, rc);
 685                 GOTO(cleanup, rc);
 686         }
 687
 688         if (filter->fo_subdir_count) {
 689                 OBD_ALLOC(tmp_subdirs, sizeof(*tmp_subdirs));
 690                 if (tmp_subdirs == NULL)
 691                         GOTO(cleanup, rc = -ENOMEM);
 692                 stage = 3;
 693
 694                 for (i = 0; i < filter->fo_subdir_count; i++) {
 695                         char dir[20];
 696                         snprintf(dir, sizeof(dir), "d%u", i);
 697
 698                         tmp_subdirs->dentry[i] =
 699                                 simple_mkdir(dentry, dir, 0700, 1);
 700                         if (IS_ERR(tmp_subdirs->dentry[i])) {
 701                                 rc = PTR_ERR(tmp_subdirs->dentry[i]);
 702                                 CERROR("can't lookup/create O/%d/%s: rc = %d\n",
 703                                        group, dir, rc);
 704                                 GOTO(cleanup, rc);
 705                         }
 706                         CDEBUG(D_INODE, "got/created O/%d/%s: %p\n", group, dir,
 707                                tmp_subdirs->dentry[i]);
 708                 }
 709         }
 710
 711         /* 'group' is an index; we need an array of length 'group + 1' */
 712         if (group + 1 > old_count) {
 713                 int len = group + 1;
 714                 OBD_ALLOC(new_objids, len * sizeof(*new_objids));
 715                 OBD_ALLOC(new_subdirs, len * sizeof(*new_subdirs));
 716                 OBD_ALLOC(new_groups, len * sizeof(*new_groups));
 717                 OBD_ALLOC(new_files, len * sizeof(*new_files));
 718                 stage = 4;
 719                 if (new_objids == NULL || new_subdirs == NULL ||
 720                     new_groups == NULL || new_files == NULL)
 721                         GOTO(cleanup, rc = -ENOMEM);
 722
 723                 memcpy(new_objids, filter->fo_last_objids,
 724                        old_count * sizeof(*new_objids));
 725                 memcpy(new_subdirs, filter->fo_subdirs,
 726                        old_count * sizeof(*new_subdirs));
 727                 memcpy(new_groups, filter->fo_groups,
 728                        old_count * sizeof(*new_groups));
 729                 memcpy(new_files, filter->fo_last_objid_files,
 730                        old_count * sizeof(*new_files));
 731
 732                 if (old_count) {
 733                         OBD_FREE(filter->fo_last_objids,
 734                                  old_count * sizeof(*new_objids));
 735                         OBD_FREE(filter->fo_subdirs,
 736                                  old_count * sizeof(*new_subdirs));
 737                         OBD_FREE(filter->fo_groups,
 738                                  old_count * sizeof(*new_groups));
 739                         OBD_FREE(filter->fo_last_objid_files,
 740                                  old_count * sizeof(*new_files));
 741                 }
 742                 filter->fo_last_objids = new_objids;
 743                 filter->fo_subdirs = new_subdirs;
 744                 filter->fo_groups = new_groups;
 745                 filter->fo_last_objid_files = new_files;
 746                 filter->fo_group_count = len;
 747         }
 748
 749         filter->fo_groups[group] = dentry;
 750         filter->fo_last_objid_files[group] = filp;
 751         if (filter->fo_subdir_count) {
 752                 filter->fo_subdirs[group] = *tmp_subdirs;
 753                 OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
 754         }
 755
 756         filter_update_last_group(obd, group);
 757
 758         if (filp->f_dentry->d_inode->i_size == 0) {
 759                 filter->fo_last_objids[group] = FILTER_INIT_OBJID;
 760                 RETURN(0);
 761         }
 762
 763         filter->fo_last_objids[group] = le64_to_cpu(last_objid);
 764         CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
 765                obd->obd_name, group, last_objid);
 766         RETURN(0);
 767  cleanup:
 768         switch (stage) {
 769         case 4:
 770                 if (new_objids != NULL)
 771                         OBD_FREE(new_objids, group * sizeof(*new_objids));
 772                 if (new_subdirs != NULL)
 773                         OBD_FREE(new_subdirs, group * sizeof(*new_subdirs));
 774                 if (new_groups != NULL)
 775                         OBD_FREE(new_groups, group * sizeof(*new_groups));
 776                 if (new_files != NULL)
 777                         OBD_FREE(new_files, group * sizeof(*new_files));
 778         case 3:
 779                 if (filter->fo_subdir_count) {
 780                         for (i = 0; i < filter->fo_subdir_count; i++) {
 781                                 if (tmp_subdirs->dentry[i] != NULL)
 782                                         dput(tmp_subdirs->dentry[i]);
 783                         }
 784                         OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
 785                 }
 786         case 2:
 787                 filp_close(filp, 0);
 788         case 1:
 789                 dput(dentry);
 790         }
 791         RETURN(rc);
 792 }
 793
 794 static int filter_read_groups(struct obd_device *obd, int last_group,
 795                               int create)
 796 {
 797         struct filter_obd *filter = &obd->u.filter;
 798         int old_count, group, rc = 0;
 799
 800         down(&filter->fo_init_lock);
 801         old_count = filter->fo_group_count;
 802         for (group = old_count; group <= last_group; group++) {
 803                 if (group == 0)
 804                         continue; /* no group zero */
 805
 806                 rc = filter_read_group_internal(obd, group, create);
 807                 if (rc != 0)
 808                         break;
 809         }
 810         up(&filter->fo_init_lock);
 811         return rc;
 812 }
 813
 814 static int filter_prep_groups(struct obd_device *obd)
 815 {
 816         struct filter_obd *filter = &obd->u.filter;
 817         struct dentry *dentry, *O_dentry;
 818         int rc = 0, cleanup_phase = 0;
 819         struct file *filp = NULL;
 820         int last_group;
 821         loff_t off = 0;
 822         ENTRY;
 823
 824         O_dentry = simple_mkdir(current->fs->pwd, "O", 0700, 1);
 825         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
 826         if (IS_ERR(O_dentry)) {
 827                 rc = PTR_ERR(O_dentry);
 828                 CERROR("cannot open/create O: rc = %d\n", rc);
 829                 GOTO(cleanup, rc);
 830         }
 831         filter->fo_dentry_O = O_dentry;
 832         cleanup_phase = 1; /* O_dentry */
 833
 834         /* Lookup "R" to tell if we're on an old OST FS and need to convert
 835          * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
 836          * some time post 1.0 when all old-style OSTs have converted along
 837          * with the init_objid hack. */
 838         dentry = ll_lookup_one_len("R", O_dentry, 1);
 839         if (IS_ERR(dentry))
 840                 GOTO(cleanup, rc = PTR_ERR(dentry));
 841         if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
 842                 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
 843                 ENTRY;
 844
 845                 CWARN("converting OST to new object layout\n");
 846                 if (IS_ERR(O0_dentry)) {
 847                         rc = PTR_ERR(O0_dentry);
 848                         CERROR("error looking up O/0: rc %d\n", rc);
 849                         GOTO(cleanup_R, rc);
 850                 }
 851
 852                 if (O0_dentry->d_inode) {
 853                         CERROR("Both O/R and O/0 exist. Fix manually.\n");
 854                         GOTO(cleanup_O0, rc = -EEXIST);
 855                 }
 856
 857                 down(&O_dentry->d_inode->i_sem);
 858                 rc = vfs_rename(O_dentry->d_inode, dentry,
 859                                 O_dentry->d_inode, O0_dentry);
 860                 up(&O_dentry->d_inode->i_sem);
 861
 862                 if (rc) {
 863                         CERROR("error renaming O/R to O/0: rc %d\n", rc);
 864                         GOTO(cleanup_O0, rc);
 865                 }
 866                 filter->fo_fsd->fsd_feature_incompat |=
 867                         cpu_to_le32(FILTER_INCOMPAT_GROUPS);
 868                 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 869                                                filter->fo_fsd, 1);
 870                 GOTO(cleanup_O0, rc);
 871
 872         cleanup_O0:
 873                 f_dput(O0_dentry);
 874         cleanup_R:
 875                 f_dput(dentry);
 876                 if (rc)
 877                         GOTO(cleanup, rc);
 878         } else {
 879                 f_dput(dentry);
 880         }
 881
 882         cleanup_phase = 2; /* groups */
 883
 884         /* we have to initialize all groups before first connections from
 885          * clients because they may send create/destroy for any group -bzzz */
 886         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
 887         if (IS_ERR(filp)) {
 888                 CERROR("cannot create LAST_GROUP: rc = %ld\n", PTR_ERR(filp));
 889                 GOTO(cleanup, rc = PTR_ERR(filp));
 890         }
 891         cleanup_phase = 3; /* filp */
 892
 893         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
 894         if (rc) {
 895                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n", rc);
 896                 GOTO(cleanup, rc);
 897         }
 898         if (off == 0) {
 899                 last_group = FILTER_MIN_GROUPS;
 900         } else {
 901                 LASSERT(last_group >= FILTER_MIN_GROUPS);
 902         }
 903
 904         CWARN("%s: initialize groups [%d,%d]\n", obd->obd_name,
 905               FILTER_MIN_GROUPS, last_group);
 906         filter->fo_committed_group = last_group;
 907         rc = filter_read_groups(obd, last_group, 1);
 908         if (rc)
 909                 GOTO(cleanup, rc);
 910
 911         filp_close(filp, 0);
 912         RETURN(0);
 913
 914  cleanup:
 915         switch (cleanup_phase) {
 916         case 3:
 917                 filp_close(filp, 0);
 918         case 2:
 919                 filter_cleanup_groups(obd);
 920         case 1:
 921                 f_dput(filter->fo_dentry_O);
 922                 filter->fo_dentry_O = NULL;
 923         default:
 924                 break;
 925         }
 926         return rc;
 927 }
 928
 929 /* setup the object store with correct subdirectories */
 930 static int filter_prep(struct obd_device *obd)
 931 {
 932         struct lvfs_run_ctxt saved;
 933         struct filter_obd *filter = &obd->u.filter;
 934         struct file *file;
 935         struct inode *inode;
 936         int rc = 0;
 937         ENTRY;
 938
 939         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 940         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 941         if (!file || IS_ERR(file)) {
 942                 rc = PTR_ERR(file);
 943                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 944                        LAST_RCVD, rc);
 945                 GOTO(out, rc);
 946         }
 947
 948         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 949                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
 950                        file->f_dentry->d_inode->i_mode);
 951                 GOTO(err_filp, rc = -ENOENT);
 952         }
 953
 954         /* steal operations */
 955         inode = file->f_dentry->d_inode;
 956         filter->fo_fop = file->f_op;
 957         filter->fo_iop = inode->i_op;
 958         filter->fo_aops = inode->i_mapping->a_ops;
 959
 960         rc = filter_init_server_data(obd, file);
 961         if (rc) {
 962                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
 963                 GOTO(err_filp, rc);
 964         }
 965         filter->fo_rcvd_filp = file;
 966
 967         rc = filter_prep_groups(obd);
 968         if (rc)
 969                 GOTO(err_server_data, rc);
 970
 971  out:
 972         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 973
 974         return(rc);
 975
 976  err_server_data:
 977         //class_disconnect_exports(obd, 0);
 978         filter_free_server_data(filter);
 979  err_filp:
 980         if (filp_close(file, 0))
 981                 CERROR("can't close %s after error\n", LAST_RCVD);
 982         filter->fo_rcvd_filp = NULL;
 983         goto out;
 984 }
 985
 986 /* cleanup the filter: write last used object id to status file */
 987 static void filter_post(struct obd_device *obd)
 988 {
 989         struct lvfs_run_ctxt saved;
 990         struct filter_obd *filter = &obd->u.filter;
 991         int rc, i;
 992
 993         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
 994          * best to start a transaction with h_sync, because we removed this
 995          * from lastobjid */
 996
 997         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 998         rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 999                                        filter->fo_fsd, 0);
1000         if (rc)
1001                 CERROR("error writing server data: rc = %d\n", rc);
1002
1003         for (i = 1; i < filter->fo_group_count; i++) {
1004                 rc = filter_update_last_objid(obd, i,
1005                                              (i == filter->fo_group_count - 1));
1006                 if (rc)
1007                         CERROR("error writing group %d lastobjid: rc = %d\n",
1008                                i, rc);
1009         }
1010
1011         rc = filp_close(filter->fo_rcvd_filp, 0);
1012         filter->fo_rcvd_filp = NULL;
1013         if (rc)
1014                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
1015
1016         filter_cleanup_groups(obd);
1017         filter_free_server_data(filter);
1018         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1019 }
1020
1021 static void filter_set_last_id(struct filter_obd *filter, int group, obd_id id)
1022 {
1023         LASSERT(filter->fo_fsd != NULL);
1024         LASSERT(group > 0);
1025         LASSERT(group < filter->fo_group_count);
1026
1027         spin_lock(&filter->fo_objidlock);
1028         filter->fo_last_objids[group] = id;
1029         spin_unlock(&filter->fo_objidlock);
1030 }
1031
1032 __u64 filter_last_id(struct filter_obd *filter, int group)
1033 {
1034         obd_id id;
1035         LASSERT(filter->fo_fsd != NULL);
1036         LASSERT(group > 0);
1037         LASSERT(group < filter->fo_group_count);
1038
1039         spin_lock(&filter->fo_objidlock);
1040         id = filter->fo_last_objids[group];
1041         spin_unlock(&filter->fo_objidlock);
1042
1043         return id;
1044 }
1045
1046 /* direct cut-n-paste of mds_blocking_ast() */
1047 static int filter_blocking_ast(struct ldlm_lock *lock,
1048                                struct ldlm_lock_desc *desc,
1049                                void *data, int flag)
1050 {
1051         int do_ast;
1052         ENTRY;
1053
1054         if (flag == LDLM_CB_CANCELING) {
1055                 /* Don't need to do anything here. */
1056                 RETURN(0);
1057         }
1058
1059         /* XXX layering violation!  -phil */
1060         l_lock(&lock->l_resource->lr_namespace->ns_lock);
1061         /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
1062          * such that filter_blocking_ast is called just before l_i_p takes the
1063          * ns_lock, then by the time we get the lock, we might not be the
1064          * correct blocking function anymore.  So check, and return early, if
1065          * so. */
1066         if (lock->l_blocking_ast != filter_blocking_ast) {
1067                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
1068                 RETURN(0);
1069         }
1070
1071         lock->l_flags |= LDLM_FL_CBPENDING;
1072         do_ast = (!lock->l_readers && !lock->l_writers);
1073         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
1074
1075         if (do_ast) {
1076                 struct lustre_handle lockh;
1077                 int rc;
1078
1079                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
1080                 ldlm_lock2handle(lock, &lockh);
1081                 rc = ldlm_cli_cancel(&lockh);
1082                 if (rc < 0)
1083                         CERROR("ldlm_cli_cancel: %d\n", rc);
1084         } else {
1085                 LDLM_DEBUG(lock, "Lock still has references, will be "
1086                            "cancelled later");
1087         }
1088         RETURN(0);
1089 }
1090
1091 extern void *lock_dir(struct inode *dir, struct qstr *name);
1092 extern void unlock_dir(struct inode *dir, void *lock);
1093
1094 static void *filter_lock_dentry(struct obd_device *obd,
1095                                 struct dentry *dparent,
1096                                 obd_id id)
1097 {
1098 #ifdef S_PDIROPS
1099         struct qstr qstr;
1100         char name[32];
1101         int len;
1102
1103         len = sprintf(name, LPU64, id);
1104         qstr_assign(&qstr, (char *)name, len);
1105         return lock_dir(dparent->d_inode, &qstr);
1106 #else
1107         down(&dparent->d_inode->i_sem);
1108 #endif
1109         return 0;
1110 }
1111
1112 /* We never dget the object parent, so DON'T dput it either */
1113 static void filter_parent_unlock(struct dentry *dparent, void *lock)
1114 {
1115 #ifdef S_PDIROPS
1116         LASSERT(lock != NULL);
1117         unlock_dir(dparent->d_inode, lock);
1118 #else
1119         up(&dparent->d_inode->i_sem);
1120 #endif
1121 }
1122
1123 /* We never dget the object parent, so DON'T dput it either */
1124 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
1125 {
1126         struct filter_obd *filter = &obd->u.filter;
1127         LASSERT(group < filter->fo_group_count);
1128         LASSERT(group > 0);
1129
1130         if (filter->fo_subdir_count == 0)
1131                 return filter->fo_groups[group];
1132
1133         return filter->fo_subdirs[group].dentry[objid & (filter->fo_subdir_count - 1)];
1134 }
1135
1136 /* We never dget the object parent, so DON'T dput it either */
1137 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
1138                                   obd_id objid, void **lock)
1139 {
1140         unsigned long now = jiffies;
1141         struct dentry *dparent = filter_parent(obd, group, objid);
1142
1143         if (IS_ERR(dparent))
1144                 return dparent;
1145
1146         LASSERT(dparent);
1147         LASSERT(dparent->d_inode);
1148
1149         *lock = filter_lock_dentry(obd, dparent, objid);
1150         fsfilt_check_slow(now, obd_timeout, "parent lock");
1151         return dparent;
1152 }
1153
1154 /* How to get files, dentries, inodes from object id's.
1155  *
1156  * If dir_dentry is passed, the caller has already locked the parent
1157  * appropriately for this operation (normally a write lock).  If
1158  * dir_dentry is NULL, we do a read lock while we do the lookup to
1159  * avoid races with create/destroy and such changing the directory
1160  * internal to the filesystem code. */
1161 struct dentry *filter_id2dentry(struct obd_device *obd,
1162                                 struct dentry *dir_dentry,
1163                                 obd_gr group, obd_id id)
1164 {
1165         struct dentry *dparent = dir_dentry;
1166         struct dentry *dchild;
1167         void *lock = NULL;
1168         char name[32];
1169         int len;
1170         ENTRY;
1171
1172         if (id == 0) {
1173                 CERROR("fatal: invalid object id 0\n");
1174                 RETURN(ERR_PTR(-ESTALE));
1175         }
1176
1177         len = sprintf(name, LPU64, id);
1178         if (dir_dentry == NULL) {
1179                 dparent = filter_parent_lock(obd, group, id, &lock);
1180                 if (IS_ERR(dparent)) {
1181                         CERROR("%s: error getting object "LPU64":"LPU64
1182                                " parent: rc %ld\n", obd->obd_name,
1183                                id, group, PTR_ERR(dparent));
1184                         RETURN(dparent);
1185                 }
1186         }
1187         CDEBUG(D_INODE, "looking up object O/%.*s/%s\n",
1188                dparent->d_name.len, dparent->d_name.name, name);
1189         dchild = /*ll_*/lookup_one_len(name, dparent, len);
1190         if (dir_dentry == NULL)
1191                 filter_parent_unlock(dparent, lock);
1192         if (IS_ERR(dchild)) {
1193                 CERROR("%s: child lookup error %ld\n", obd->obd_name,
1194                        PTR_ERR(dchild));
1195                 RETURN(dchild);
1196         }
1197
1198         if (dchild->d_inode != NULL && is_bad_inode(dchild->d_inode)) {
1199                 CERROR("%s: got bad inode "LPU64"\n", obd->obd_name, id);
1200                 f_dput(dchild);
1201                 RETURN(ERR_PTR(-ENOENT));
1202         }
1203
1204         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1205                name, dchild, atomic_read(&dchild->d_count));
1206
1207         LASSERT(atomic_read(&dchild->d_count) > 0);
1208
1209         RETURN(dchild);
1210 }
1211
1212 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
1213                                   obd_id group)
1214 {
1215         struct lustre_handle lockh;
1216         int flags = LDLM_AST_DISCARD_DATA, rc;
1217         struct ldlm_res_id res_id = { .name = { objid, 0, group, 0 } };
1218         ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
1219
1220         ENTRY;
1221         /* Tell the clients that the object is gone now and that they should
1222          * throw away any cached pages. */
1223         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, res_id,
1224                               LDLM_EXTENT, &policy, LCK_PW,
1225                               &flags, filter_blocking_ast, ldlm_completion_ast,
1226                               NULL, NULL, NULL, 0, NULL, &lockh);
1227
1228         /* We only care about the side-effects, just drop the lock. */
1229         if (rc == ELDLM_OK)
1230                 ldlm_lock_decref(&lockh, LCK_PW);
1231
1232         RETURN(rc);
1233 }
1234
1235 /* Caller must hold LCK_PW on parent and push us into kernel context.
1236  * Caller is also required to ensure that dchild->d_inode exists. */
1237 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1238                                    struct dentry *dparent,
1239                                    struct dentry *dchild)
1240 {
1241         struct inode *inode = dchild->d_inode;
1242         int rc;
1243         ENTRY;
1244
1245         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1246                 CERROR("destroying objid %.*s nlink = %lu, count = %d\n",
1247                        dchild->d_name.len, dchild->d_name.name,
1248                        (unsigned long)inode->i_nlink,
1249                        atomic_read(&inode->i_count));
1250         }
1251
1252         rc = vfs_unlink(dparent->d_inode, dchild);
1253
1254         if (rc)
1255                 CERROR("error unlinking objid %.*s: rc %d\n",
1256                        dchild->d_name.len, dchild->d_name.name, rc);
1257
1258         RETURN(rc);
1259 }
1260
1261 static int filter_intent_policy(struct ldlm_namespace *ns,
1262                                 struct ldlm_lock **lockp, void *req_cookie,
1263                                 ldlm_mode_t mode, int flags, void *data)
1264 {
1265         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1266         struct ptlrpc_request *req = req_cookie;
1267         struct ldlm_lock *lock = *lockp, *l = NULL;
1268         struct ldlm_resource *res = lock->l_resource;
1269         ldlm_processing_policy policy;
1270         struct ost_lvb *res_lvb, *reply_lvb;
1271         struct ldlm_reply *rep;
1272         struct list_head *tmp;
1273         ldlm_error_t err;
1274         int tmpflags = 0, rc, repsize[2] = {sizeof(*rep), sizeof(*reply_lvb)};
1275         ENTRY;
1276
1277         policy = ldlm_get_processing_policy(res);
1278         LASSERT(policy != NULL);
1279         LASSERT(req != NULL);
1280
1281         rc = lustre_pack_reply(req, 2, repsize, NULL);
1282         if (rc)
1283                 RETURN(req->rq_status = rc);
1284
1285         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*rep));
1286         LASSERT(rep != NULL);
1287
1288         reply_lvb = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*reply_lvb));
1289         LASSERT(reply_lvb != NULL);
1290
1291         //fixup_handle_for_resent_req(req, lock, &lockh);
1292
1293         /* If we grant any lock at all, it will be a whole-file read lock.
1294          * Call the extent policy function to see if our request can be
1295          * granted, or is blocked. */
1296         lock->l_policy_data.l_extent.start = 0;
1297         lock->l_policy_data.l_extent.end = OBD_OBJECT_EOF;
1298         lock->l_req_mode = LCK_PR;
1299
1300         l_lock(&res->lr_namespace->ns_lock);
1301
1302         res->lr_tmp = &rpc_list;
1303         rc = policy(lock, &tmpflags, 0, &err);
1304         res->lr_tmp = NULL;
1305
1306         /* FIXME: we should change the policy function slightly, to not make
1307          * this list at all, since we just turn around and free it */
1308         while (!list_empty(&rpc_list)) {
1309                 struct ldlm_ast_work *w =
1310                         list_entry(rpc_list.next, struct ldlm_ast_work, w_list);
1311                 list_del(&w->w_list);
1312                 LDLM_LOCK_PUT(w->w_lock);
1313                 OBD_FREE(w, sizeof(*w));
1314         }
1315
1316         if (rc == LDLM_ITER_CONTINUE) {
1317                 /* The lock met with no resistance; we're finished. */
1318                 l_unlock(&res->lr_namespace->ns_lock);
1319                 RETURN(ELDLM_LOCK_REPLACED);
1320         }
1321
1322         /* Do not grant any lock, but instead send GL callbacks.  The extent
1323          * policy nicely created a list of all PW locks for us.  We will choose
1324          * the highest of those which are larger than the size in the LVB, if
1325          * any, and perform a glimpse callback. */
1326         down(&res->lr_lvb_sem);
1327         res_lvb = res->lr_lvb_data;
1328         LASSERT(res_lvb != NULL);
1329         *reply_lvb = *res_lvb;
1330         up(&res->lr_lvb_sem);
1331
1332         list_for_each(tmp, &res->lr_granted) {
1333                 struct ldlm_lock *tmplock =
1334                         list_entry(tmp, struct ldlm_lock, l_res_link);
1335
1336                 if (tmplock->l_granted_mode == LCK_PR)
1337                         continue;
1338
1339                 if (tmplock->l_policy_data.l_extent.end <= reply_lvb->lvb_size)
1340                         continue;
1341
1342                 if (l == NULL) {
1343                         l = LDLM_LOCK_GET(tmplock);
1344                         continue;
1345                 }
1346
1347                 if (l->l_policy_data.l_extent.start >
1348                     tmplock->l_policy_data.l_extent.start)
1349                         continue;
1350
1351                 LDLM_LOCK_PUT(l);
1352                 l = LDLM_LOCK_GET(tmplock);
1353         }
1354         l_unlock(&res->lr_namespace->ns_lock);
1355
1356         /* There were no PW locks beyond the size in the LVB; finished. */
1357         if (l == NULL)
1358                 RETURN(ELDLM_LOCK_ABORTED);
1359
1360         if (l->l_glimpse_ast == NULL) {
1361                 /* We are racing with unlink(); just return -ENOENT */
1362                 rep->lock_policy_res1 = -ENOENT;
1363                 goto out;
1364         }
1365
1366         LASSERTF(l->l_glimpse_ast != NULL, "l == %p", l);
1367
1368         rc = l->l_glimpse_ast(l, NULL); /* this will update the LVB */
1369         if (rc != 0 && res->lr_namespace->ns_lvbo &&
1370             res->lr_namespace->ns_lvbo->lvbo_update) {
1371                 res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
1372         }
1373
1374         down(&res->lr_lvb_sem);
1375         *reply_lvb = *res_lvb;
1376         up(&res->lr_lvb_sem);
1377 out:
1378         LDLM_LOCK_PUT(l);
1379
1380         RETURN(ELDLM_LOCK_ABORTED);
1381 }
1382
1383 static int filter_post_fs_cleanup(struct obd_device *obd)
1384 {
1385         int rc = 0;
1386
1387         rc = fsfilt_post_cleanup(obd);
1388
1389         RETURN(rc);
1390 }
1391
1392 #if 0
1393 static int filter_group_set_fs_flags(struct obd_device *obd, int group)
1394 {
1395         struct filter_obd *filter = &obd->u.filter;
1396         int rc = 0, i = 0;
1397         ENTRY;
1398
1399         /* zero group is not longer valid. */
1400         if (group== 0)
1401                 RETURN(rc);
1402         for (i = 0; i < filter->fo_subdir_count; i++) {
1403                 struct dentry *dentry;
1404                 dentry = (filter->fo_subdirs + group)->dentry[i];
1405                 rc = fsfilt_set_fs_flags(obd, dentry->d_inode,
1406                                          SM_DO_REC | SM_DO_COW);
1407                 if (rc)
1408                         RETURN(rc);
1409         }
1410         RETURN(rc);
1411 }
1412 #endif
1413
1414 static int filter_post_fs_setup(struct obd_device *obd)
1415 {
1416         struct filter_obd *filter = &obd->u.filter;
1417         int rc = 0;
1418
1419         rc = fsfilt_post_setup(obd, filter->fo_dentry_O);
1420
1421         return rc;
1422 }
1423
1424 /* mount the file system (secretly) */
1425 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1426                         char *option)
1427 {
1428         struct lustre_cfg *lcfg = buf;
1429         struct filter_obd *filter = &obd->u.filter;
1430         struct lvfs_obd_ctxt *lvfs_ctxt = NULL;
1431         struct vfsmount *mnt;
1432         char *str;
1433         char ns_name[48];
1434         int rc = 0, i;
1435         ENTRY;
1436
1437         if ((LUSTRE_CFG_BUFLEN(lcfg, 1)) < 1 ||
1438             (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1))
1439                 RETURN(-EINVAL);
1440
1441         obd->obd_fsops = fsfilt_get_ops(lustre_cfg_string(lcfg, 2));
1442         if (IS_ERR(obd->obd_fsops))
1443                 RETURN(PTR_ERR(obd->obd_fsops));
1444
1445         rc = lvfs_mount_fs(lustre_cfg_string(lcfg, 1),
1446                            lustre_cfg_string(lcfg, 2),
1447                            option, MS_NOATIME | MS_NODIRATIME, &lvfs_ctxt);
1448         if (rc) {
1449                 CERROR("lvfs_mount_fs failed: rc = %d\n", rc);
1450                 GOTO(err_ops, rc);
1451         }
1452         LASSERT(lvfs_ctxt);
1453
1454         mnt = lvfs_ctxt->loc_mnt;
1455         filter->fo_lvfs_ctxt = lvfs_ctxt;
1456
1457         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0 && lustre_cfg_buf(lcfg, 3)) {
1458                 str = lustre_cfg_string(lcfg, 3);
1459                 if (*str == 'f') {
1460                         obd->obd_replayable = 1;
1461                         obd_sync_filter = 1;
1462                         CWARN("%s: recovery enabled\n", obd->obd_name);
1463                 } else {
1464                         if (*str != 'n') {
1465                                 CERROR("unrecognised flag '%c'\n",
1466                                        *str);
1467                         }
1468                         // XXX Robert? Why do we get errors here
1469                         // GOTO(err_mntput, rc = -EINVAL);
1470                 }
1471         }
1472
1473         filter->fo_vfsmnt = mnt;
1474         filter->fo_sb = mnt->mnt_sb;
1475         filter->fo_fstype = mnt->mnt_sb->s_type->name;
1476         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1477
1478         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1479         obd->obd_lvfs_ctxt.pwdmnt = mnt;
1480         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
1481         obd->obd_lvfs_ctxt.fs = get_ds();
1482         obd->obd_lvfs_ctxt.cb_ops = filter_lvfs_ops;
1483
1484         ll_clear_rdonly(ll_sbdev(filter->fo_sb));
1485
1486         rc = fsfilt_setup(obd, mnt->mnt_sb);
1487         if (rc)
1488                 GOTO(err_mntput, rc);
1489
1490         sema_init(&filter->fo_init_lock, 1);
1491         filter->fo_committed_group = 0;
1492         rc = filter_prep(obd);
1493         if (rc)
1494                 GOTO(err_mntput, rc);
1495
1496         filter->fo_destroys_in_progress = 0;
1497         for (i = 0; i < 32; i++)
1498                 sema_init(&filter->fo_create_locks[i], 1);
1499
1500         spin_lock_init(&filter->fo_translock);
1501         spin_lock_init(&filter->fo_objidlock);
1502         INIT_LIST_HEAD(&filter->fo_export_list);
1503         sema_init(&filter->fo_alloc_lock, 1);
1504         spin_lock_init(&filter->fo_r_pages.oh_lock);
1505         spin_lock_init(&filter->fo_w_pages.oh_lock);
1506         spin_lock_init(&filter->fo_r_discont_pages.oh_lock);
1507         spin_lock_init(&filter->fo_w_discont_pages.oh_lock);
1508         spin_lock_init(&filter->fo_r_discont_blocks.oh_lock);
1509         spin_lock_init(&filter->fo_w_discont_blocks.oh_lock);
1510         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
1511
1512         INIT_LIST_HEAD(&filter->fo_llog_list);
1513         spin_lock_init(&filter->fo_llog_list_lock);
1514
1515         sprintf(ns_name, "filter-%s", obd->obd_uuid.uuid);
1516         obd->obd_namespace = ldlm_namespace_new(ns_name, LDLM_NAMESPACE_SERVER);
1517
1518         if (obd->obd_namespace == NULL)
1519                 GOTO(err_post, rc = -ENOMEM);
1520         obd->obd_namespace->ns_lvbp = obd;
1521         obd->obd_namespace->ns_lvbo = &filter_lvbo;
1522         ldlm_register_intent(obd->obd_namespace, filter_intent_policy);
1523
1524         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1525                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1526
1527         rc = obd_llog_cat_initialize(obd, &obd->obd_llogs, 1, CATLIST);
1528         if (rc) {
1529                 CERROR("failed to setup llogging subsystems\n");
1530                 GOTO(err_post, rc);
1531         }
1532         RETURN(0);
1533
1534 err_post:
1535         filter_post(obd);
1536 err_mntput:
1537         unlock_kernel();
1538         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1539         filter->fo_sb = 0;
1540         lock_kernel();
1541 err_ops:
1542         fsfilt_put_ops(obd->obd_fsops);
1543         return rc;
1544 }
1545
1546 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1547 {
1548         struct lprocfs_static_vars lvars;
1549         int rc;
1550
1551         lprocfs_init_vars(filter, &lvars);
1552         rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1553         if (rc != 0)
1554                 return rc;
1555
1556         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1557         if (rc != 0)
1558                 return rc;
1559
1560         /* Init obdfilter private stats here */
1561         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1562                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1563         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1564                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1565
1566         return lproc_filter_attach_seqstat(obd);
1567 }
1568
1569 static int filter_detach(struct obd_device *dev)
1570 {
1571         lprocfs_free_obd_stats(dev);
1572         return lprocfs_obd_detach(dev);
1573 }
1574
1575 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1576 {
1577         struct lustre_cfg* lcfg = buf;
1578         struct filter_obd *filter = &obd->u.filter;
1579         int rc;
1580         ENTRY;
1581
1582         spin_lock_init(&filter->fo_denylist_lock);
1583         INIT_LIST_HEAD(&filter->fo_denylist);
1584
1585         /* all mount options including errors=remount-ro and asyncdel are passed
1586          * using 4th lcfg param. And it is good, finally we have got rid of
1587          * hardcoded fs types in the code. */
1588         rc = filter_common_setup(obd, len, buf, lustre_cfg_buf(lcfg, 4));
1589         if (rc)
1590                 RETURN(rc);
1591         rc = filter_post_fs_setup(obd);
1592         RETURN(rc);
1593 }
1594
1595 static int filter_cleanup(struct obd_device *obd, int flags)
1596 {
1597         struct filter_obd *filter = &obd->u.filter;
1598         ll_sbdev_type save_dev;
1599         ENTRY;
1600
1601         if (flags & OBD_OPT_FAILOVER)
1602                 CERROR("%s: shutting down for failover; client state will"
1603                        " be preserved.\n", obd->obd_name);
1604
1605         if (!list_empty(&obd->obd_exports)) {
1606                 CERROR("%s: still has clients!\n", obd->obd_name);
1607                 class_disconnect_exports(obd, flags);
1608                 if (!list_empty(&obd->obd_exports)) {
1609                         CERROR("still has exports after forced cleanup?\n");
1610                         RETURN(-EBUSY);
1611                 }
1612         }
1613
1614         target_cleanup_recovery(obd);
1615
1616         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1617
1618         if (filter->fo_sb == NULL)
1619                 RETURN(0);
1620
1621         save_dev = ll_sbdev(filter->fo_sb);
1622         filter_post_fs_cleanup(obd);
1623         filter_post(obd);
1624
1625         shrink_dcache_parent(filter->fo_sb->s_root);
1626         filter->fo_sb = 0;
1627
1628         spin_lock(&filter->fo_denylist_lock);
1629         while (!list_empty(&filter->fo_denylist)) {
1630                 deny_sec_t *p_deny_sec = list_entry(filter->fo_denylist.next,
1631                                                     deny_sec_t, list);
1632                 list_del(&p_deny_sec->list);
1633                 OBD_FREE(p_deny_sec, sizeof(*p_deny_sec));
1634         }
1635         spin_unlock(&filter->fo_denylist_lock);
1636
1637         unlock_kernel();
1638         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1639         //destroy_buffers(filter->fo_sb->s_dev);
1640         filter->fo_sb = NULL;
1641         fsfilt_put_ops(obd->obd_fsops);
1642         lock_kernel();
1643
1644         ll_clear_rdonly(save_dev);
1645
1646         RETURN(0);
1647 }
1648
1649 static int filter_process_config(struct obd_device *obd, obd_count len, void *buf)
1650 {
1651         struct lustre_cfg *lcfg = buf;
1652         struct filter_obd *filter = &obd->u.filter;
1653         int rc = 0;
1654         ENTRY;
1655
1656         switch(lcfg->lcfg_command) {
1657         case LCFG_SET_SECURITY: {
1658                 if ((LUSTRE_CFG_BUFLEN(lcfg, 1) == 0) ||
1659                     (LUSTRE_CFG_BUFLEN(lcfg, 2) == 0))
1660                         GOTO(out, rc = -EINVAL);
1661
1662                 if (!strcmp(lustre_cfg_string(lcfg, 1), "deny_sec")){
1663                         spin_lock(&filter->fo_denylist_lock);
1664                         rc = add_deny_security(lustre_cfg_string(lcfg, 2),
1665                                                &filter->fo_denylist);
1666                         spin_unlock(&filter->fo_denylist_lock);
1667                 }else {
1668                         CERROR("Unrecognized key\n");
1669                         rc = -EINVAL;
1670                 }
1671                 break;
1672         }
1673         default: {
1674                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1675                 GOTO(out, rc = -EINVAL);
1676
1677         }
1678         }
1679 out:
1680         RETURN(rc);
1681 }
1682
1683 static int filter_connect_post(struct obd_export *exp, unsigned initial,
1684                                unsigned long connect_flags)
1685 {
1686         struct obd_device *obd = exp->exp_obd;
1687         struct filter_export_data *fed;
1688         char str[PTL_NALFMT_SIZE];
1689         struct obd_llogs *llog;
1690         struct llog_ctxt *ctxt;
1691         int rc = 0;
1692         ENTRY;
1693
1694         fed = &exp->exp_filter_data;
1695         if (fed->fed_group < FILTER_MIN_GROUPS)
1696                 RETURN(0);
1697
1698         /* initialize llogs for connections from MDS */
1699         llog = filter_grab_llog_for_group(obd, fed->fed_group, exp);
1700         LASSERT(llog != NULL);
1701
1702         ctxt = llog_get_context(llog, LLOG_UNLINK_REPL_CTXT);
1703         LASSERT(ctxt != NULL);
1704
1705         rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
1706
1707         portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1708                         exp->exp_connection->c_peer.peer_id.nid, str);
1709
1710         CDEBUG(D_OTHER, "%s: init llog ctxt for export "LPX64"/%s, group %d\n",
1711                obd->obd_name, exp->exp_connection->c_peer.peer_id.nid,
1712                str, fed->fed_group);
1713
1714         RETURN(rc);
1715 }
1716
1717 /* nearly identical to mds_connect */
1718 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1719                           struct obd_uuid *cluuid,
1720                           struct obd_connect_data *data,
1721                           unsigned long connect_flags)
1722 {
1723         struct obd_export *exp;
1724         struct filter_export_data *fed;
1725         struct filter_client_data *fcd = NULL;
1726         struct filter_obd *filter = &obd->u.filter;
1727         struct lvfs_run_ctxt saved;
1728         int rc, group;
1729         ENTRY;
1730
1731         if (conn == NULL || obd == NULL || cluuid == NULL)
1732                 RETURN(-EINVAL);
1733
1734         rc = class_connect(conn, obd, cluuid);
1735         if (rc)
1736                 RETURN(rc);
1737         exp = class_conn2export(conn);
1738         LASSERT(exp != NULL);
1739
1740         fed = &exp->exp_filter_data;
1741
1742         spin_lock_init(&fed->fed_lock);
1743
1744        /* connection from MDS */
1745         group = connect_flags;
1746         if (obd->obd_replayable) {
1747                 OBD_ALLOC(fcd, sizeof(*fcd));
1748                 if (!fcd) {
1749                         CERROR("filter: out of memory for client data\n");
1750                         GOTO(cleanup, rc = -ENOMEM);
1751                 }
1752
1753                 memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1754                 fed->fed_fcd = fcd;
1755                 fed->fed_fcd->fcd_group = group;
1756                 rc = filter_client_add(obd, filter, fed, -1);
1757                 if (rc)
1758                         GOTO(cleanup, rc);
1759         }
1760         CWARN("%s: Received MDS connection ("LPX64"); group %d\n",
1761               obd->obd_name, exp->exp_handle.h_cookie, group);
1762
1763         if (group == 0)
1764                 GOTO(cleanup, rc);
1765
1766         if (fed->fed_group != 0 && fed->fed_group != group) {
1767                 char str[PTL_NALFMT_SIZE];
1768                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1769                                 exp->exp_connection->c_peer.peer_id.nid, str);
1770                 CERROR("!!! This export (nid "LPX64"/%s) used object group %d "
1771                        "earlier; now it's trying to use group %d!  This could "
1772                        "be a bug in the MDS.  Tell CFS.\n",
1773                        exp->exp_connection->c_peer.peer_id.nid, str,
1774                        fed->fed_group, group);
1775                 GOTO(cleanup, rc = -EPROTO);
1776         }
1777         fed->fed_group = group;
1778
1779         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1780         rc = filter_read_groups(obd, group, 1);
1781         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1782         if (rc != 0) {
1783                 CERROR("can't read group %u\n", group);
1784                 GOTO(cleanup, rc);
1785         }
1786 #if 0
1787         rc = filter_group_set_fs_flags(obd, group);
1788         if (rc != 0) {
1789                 CERROR("can't set kml flags %u\n", group);
1790                 GOTO(cleanup, rc);
1791         }
1792 #endif
1793 cleanup:
1794         if (rc) {
1795                 if (fcd)
1796                         OBD_FREE(fcd, sizeof(*fcd));
1797                 class_disconnect(exp, 0);
1798         } else {
1799                 class_export_put(exp);
1800         }
1801         return rc;
1802 }
1803
1804 static int filter_precleanup(struct obd_device *obd, int flags)
1805 {
1806         struct filter_group_llog *log;
1807         struct filter_obd *filter;
1808         int rc = 0;
1809         ENTRY;
1810
1811         filter = &obd->u.filter;
1812
1813         spin_lock(&filter->fo_llog_list_lock);
1814         while (!list_empty(&filter->fo_llog_list)) {
1815                 log = list_entry(filter->fo_llog_list.next,
1816                                  struct filter_group_llog, list);
1817                 list_del(&log->list);
1818                 spin_unlock(&filter->fo_llog_list_lock);
1819
1820                 rc = obd_llog_finish(obd, log->llogs, 0);
1821                 if (rc)
1822                         CERROR("failed to cleanup llogging subsystem for %u\n",
1823                                 log->group);
1824                 OBD_FREE(log->llogs, sizeof(*(log->llogs)));
1825                 OBD_FREE(log, sizeof(*log));
1826                 spin_lock(&filter->fo_llog_list_lock);
1827         }
1828         spin_unlock(&filter->fo_llog_list_lock);
1829
1830         rc = obd_llog_finish(obd, &obd->obd_llogs, 0);
1831         if (rc)
1832                 CERROR("failed to cleanup llogging subsystem\n");
1833
1834         RETURN(rc);
1835 }
1836
1837 /* Do extra sanity checks for grant accounting.  We do this at connect,
1838  * disconnect, and statfs RPC time, so it shouldn't be too bad.  We can
1839  * always get rid of it or turn it off when we know accounting is good. */
1840 static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
1841 {
1842         struct filter_export_data *fed;
1843         struct obd_export *exp;
1844         obd_size maxsize = obd->obd_osfs.os_blocks * obd->obd_osfs.os_bsize;
1845         obd_size tot_dirty = 0, tot_pending = 0, tot_granted = 0;
1846         obd_size fo_tot_dirty, fo_tot_pending, fo_tot_granted;
1847         int level = D_CACHE;
1848
1849         if (list_empty(&obd->obd_exports))
1850                 return;
1851
1852         spin_lock(&obd->obd_osfs_lock);
1853         spin_lock(&obd->obd_dev_lock);
1854         list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
1855                 fed = &exp->exp_filter_data;
1856                 if (fed->fed_grant < 0 || fed->fed_pending < 0 ||
1857                     fed->fed_dirty < 0)
1858                         level = D_ERROR;
1859                 if (maxsize > 0) { /* we may not have done a statfs yet */
1860                         LASSERTF(fed->fed_grant + fed->fed_pending <= maxsize,
1861                                  "cli %s/%p %ld+%ld > "LPU64"\n",
1862                                  exp->exp_client_uuid.uuid, exp,
1863                                  fed->fed_grant, fed->fed_pending, maxsize);
1864                         LASSERTF(fed->fed_dirty <= maxsize,
1865                                  "cli %s/%p %ld > "LPU64"\n",
1866                                  exp->exp_client_uuid.uuid, exp,
1867                                  fed->fed_dirty, maxsize);
1868                 }
1869                 CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1870                        obd->obd_name, exp->exp_client_uuid.uuid, exp,
1871                        fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1872                 tot_granted += fed->fed_grant + fed->fed_pending;
1873                 tot_pending += fed->fed_pending;
1874                 tot_dirty += fed->fed_dirty;
1875         }
1876         fo_tot_granted = obd->u.filter.fo_tot_granted;
1877         fo_tot_pending = obd->u.filter.fo_tot_pending;
1878         fo_tot_dirty = obd->u.filter.fo_tot_dirty;
1879         spin_unlock(&obd->obd_dev_lock);
1880         spin_unlock(&obd->obd_osfs_lock);
1881
1882         /* Do these assertions outside the spinlocks so we don't kill system */
1883         if (tot_granted != fo_tot_granted)
1884                 CERROR("%s: tot_granted "LPU64" != fo_tot_granted "LPU64"\n",
1885                        func, tot_granted, fo_tot_granted);
1886         if (tot_pending != fo_tot_pending)
1887                 CERROR("%s: tot_pending "LPU64" != fo_tot_pending "LPU64"\n",
1888                        func, tot_pending, fo_tot_pending);
1889         if (tot_dirty != fo_tot_dirty)
1890                 CERROR("%s: tot_dirty "LPU64" != fo_tot_dirty "LPU64"\n",
1891                        func, tot_dirty, fo_tot_dirty);
1892         if (tot_pending > tot_granted)
1893                 CERROR("%s: tot_pending "LPU64" > tot_granted "LPU64"\n",
1894                        func, tot_pending, tot_granted);
1895         if (tot_granted > maxsize)
1896                 CERROR("%s: tot_granted "LPU64" > maxsize "LPU64"\n",
1897                        func, tot_granted, maxsize);
1898         if (tot_dirty > maxsize)
1899                 CERROR("%s: tot_dirty "LPU64" > maxsize "LPU64"\n",
1900                        func, tot_dirty, maxsize);
1901 }
1902
1903 /* Remove this client from the grant accounting totals.  We also remove
1904  * the export from the obd device under the osfs and dev locks to ensure
1905  * that the filter_grant_sanity_check() calculations are always valid.
1906  * The client should do something similar when it invalidates its import. */
1907 static void filter_grant_discard(struct obd_export *exp)
1908 {
1909         struct obd_device *obd = exp->exp_obd;
1910         struct filter_obd *filter = &obd->u.filter;
1911         struct filter_export_data *fed = &exp->exp_filter_data;
1912         int level = D_CACHE;
1913
1914         spin_lock(&obd->obd_osfs_lock);
1915         spin_lock(&exp->exp_obd->obd_dev_lock);
1916         list_del_init(&exp->exp_obd_chain);
1917         spin_unlock(&exp->exp_obd->obd_dev_lock);
1918
1919         if (fed->fed_dirty < 0 || fed->fed_grant < 0 || fed->fed_pending < 0)
1920                 level = D_ERROR;
1921         CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1922                obd->obd_name, exp->exp_client_uuid.uuid, exp,
1923                fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1924
1925         LASSERTF(filter->fo_tot_granted >= fed->fed_grant,
1926                  "%s: tot_granted "LPU64" cli %s/%p fed_grant %ld\n",
1927                  obd->obd_name, filter->fo_tot_granted,
1928                  exp->exp_client_uuid.uuid, exp, fed->fed_grant);
1929         filter->fo_tot_granted -= fed->fed_grant;
1930         LASSERTF(filter->fo_tot_pending >= fed->fed_pending,
1931                  "%s: tot_pending "LPU64" cli %s/%p fed_pending %ld\n",
1932                  obd->obd_name, filter->fo_tot_pending,
1933                  exp->exp_client_uuid.uuid, exp, fed->fed_pending);
1934         LASSERTF(filter->fo_tot_dirty >= fed->fed_dirty,
1935                  "%s: tot_dirty "LPU64" cli %s/%p fed_dirty %ld\n",
1936                  obd->obd_name, filter->fo_tot_dirty,
1937                  exp->exp_client_uuid.uuid, exp, fed->fed_dirty);
1938         filter->fo_tot_dirty -= fed->fed_dirty;
1939         fed->fed_dirty = 0;
1940         fed->fed_grant = 0;
1941
1942         spin_unlock(&obd->obd_osfs_lock);
1943 }
1944
1945 static int filter_destroy_export(struct obd_export *exp)
1946 {
1947         ENTRY;
1948
1949         if (exp->exp_filter_data.fed_pending)
1950                 CERROR("%s: cli %s/%p has %lu pending on destroyed export\n",
1951                        exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
1952                        exp, exp->exp_filter_data.fed_pending);
1953
1954         target_destroy_export(exp);
1955
1956         if (exp->exp_obd->obd_replayable)
1957                 filter_client_free(exp, exp->exp_flags);
1958
1959         filter_grant_discard(exp);
1960         if (!(exp->exp_flags & OBD_OPT_FORCE))
1961                 filter_grant_sanity_check(exp->exp_obd, __FUNCTION__);
1962
1963         RETURN(0);
1964 }
1965
1966 static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
1967 {
1968         struct filter_group_llog *fglog, *nlog;
1969         struct filter_obd *filter;
1970         int worked = 0, group;
1971         struct llog_ctxt *ctxt;
1972         ENTRY;
1973
1974         filter = &obd->u.filter;
1975
1976         /* we can't sync log holding spinlock. also, we do not want to get
1977          * into livelock. so we do following: loop over MDS's exports in
1978          * group order and skip already synced llogs -bzzz */
1979         do {
1980                 /* look for group with min. number, but > worked */
1981                 fglog = NULL;
1982                 group = 1 << 30;
1983                 spin_lock(&filter->fo_llog_list_lock);
1984                 list_for_each_entry(nlog, &filter->fo_llog_list, list) {
1985
1986                         if (nlog->group <= worked) {
1987                                 /* this group is already synced */
1988                                 continue;
1989                         }
1990
1991                         if (group < nlog->group) {
1992                                 /* we have group with smaller number to sync */
1993                                 continue;
1994                         }
1995
1996                         /* store current minimal group */
1997                         fglog = nlog;
1998                         group = nlog->group;
1999                 }
2000                 spin_unlock(&filter->fo_llog_list_lock);
2001
2002                 if (fglog == NULL)
2003                         break;
2004
2005                 worked = fglog->group;
2006                 if (fglog->exp && (dexp == fglog->exp || dexp == NULL)) {
2007                         ctxt = llog_get_context(fglog->llogs,
2008                                         LLOG_UNLINK_REPL_CTXT);
2009                         LASSERT(ctxt != NULL);
2010                         llog_sync(ctxt, fglog->exp);
2011                 }
2012         } while (fglog != NULL);
2013 }
2014
2015 /* also incredibly similar to mds_disconnect */
2016 static int filter_disconnect(struct obd_export *exp, unsigned long flags)
2017 {
2018         struct obd_device *obd = exp->exp_obd;
2019         unsigned long irqflags;
2020         int rc;
2021         ENTRY;
2022
2023         LASSERT(exp);
2024         class_export_get(exp);
2025
2026         spin_lock_irqsave(&exp->exp_lock, irqflags);
2027         exp->exp_flags = flags;
2028         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
2029
2030         if (!(flags & OBD_OPT_FORCE))
2031                 filter_grant_sanity_check(obd, __FUNCTION__);
2032         filter_grant_discard(exp);
2033
2034         /* Disconnect early so that clients can't keep using export */
2035         rc = class_disconnect(exp, flags);
2036
2037         ldlm_cancel_locks_for_export(exp);
2038
2039         fsfilt_sync(obd, obd->u.filter.fo_sb);
2040
2041         /* flush any remaining cancel messages out to the target */
2042         filter_sync_llogs(obd, exp);
2043         class_export_put(exp);
2044         RETURN(rc);
2045 }
2046
2047 struct dentry *__filter_oa2dentry(struct obd_device *obd,
2048                                   struct obdo *oa, const char *what)
2049 {
2050         struct dentry *dchild = NULL;
2051         obd_gr group = 0;
2052         ENTRY;
2053
2054         if (oa->o_valid & OBD_MD_FLGROUP)
2055                 group = oa->o_gr;
2056
2057         dchild = filter_id2dentry(obd, NULL, group, oa->o_id);
2058
2059         if (IS_ERR(dchild)) {
2060                 CERROR("%s error looking up object: "LPU64"\n",
2061                        what, oa->o_id);
2062                 RETURN(dchild);
2063         }
2064
2065         if (dchild->d_inode == NULL) {
2066                 CDEBUG(D_INFO, "%s: %s on non-existent object: "
2067                        LPU64"\n", obd->obd_name, what, oa->o_id);
2068                 f_dput(dchild);
2069                 RETURN(ERR_PTR(-ENOENT));
2070         }
2071
2072         RETURN(dchild);
2073 }
2074
2075 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
2076                           struct lov_stripe_md *md)
2077 {
2078         struct dentry *dentry = NULL;
2079         struct obd_device *obd;
2080         int rc = 0;
2081         ENTRY;
2082
2083         obd = class_exp2obd(exp);
2084         if (obd == NULL) {
2085                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2086                        exp->exp_handle.h_cookie);
2087                 RETURN(-EINVAL);
2088         }
2089
2090         dentry = filter_oa2dentry(obd, oa);
2091         if (IS_ERR(dentry))
2092                 RETURN(PTR_ERR(dentry));
2093
2094         /* Limit the valid bits in the return data to what we actually use */
2095         oa->o_valid = OBD_MD_FLID;
2096         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2097
2098         f_dput(dentry);
2099         RETURN(rc);
2100 }
2101
2102 int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
2103                             struct obdo *oa, struct obd_trans_info *oti)
2104 {
2105         struct filter_obd *filter;
2106         struct iattr iattr;
2107         void *handle;
2108         int rc, err;
2109         ENTRY;
2110
2111         LASSERT(dentry != NULL);
2112         LASSERT(!IS_ERR(dentry));
2113         LASSERT(dentry->d_inode != NULL);
2114
2115         filter = &exp->exp_obd->u.filter;
2116         iattr_from_obdo(&iattr, oa, oa->o_valid);
2117
2118         if (iattr.ia_valid & ATTR_SIZE)
2119                 down(&dentry->d_inode->i_sem);
2120         handle = fsfilt_start(exp->exp_obd, dentry->d_inode,
2121                               FSFILT_OP_SETATTR, oti);
2122         if (IS_ERR(handle))
2123                 GOTO(out_unlock, rc = PTR_ERR(handle));
2124
2125         /* XXX this could be a rwsem instead, if filter_preprw played along */
2126         if (iattr.ia_valid & ATTR_ATTR_FLAG)
2127                 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode,
2128                                       NULL, EXT3_IOC_SETFLAGS,
2129                                       (long)&iattr.ia_attr_flags);
2130         else
2131                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle,
2132                                     &iattr, 1);
2133
2134         rc = filter_finish_transno(exp, oti, rc);
2135
2136         err = fsfilt_commit(exp->exp_obd, filter->fo_sb,
2137                             dentry->d_inode, handle,
2138                             exp->exp_sync);
2139         if (err) {
2140                 CERROR("error on commit, err = %d\n", err);
2141                 if (!rc)
2142                         rc = err;
2143         }
2144         EXIT;
2145 out_unlock:
2146         if (iattr.ia_valid & ATTR_SIZE)
2147                 up(&dentry->d_inode->i_sem);
2148         return rc;
2149 }
2150
2151 /* this is called from filter_truncate() until we have filter_punch() */
2152 int filter_setattr(struct obd_export *exp, struct obdo *oa,
2153                    struct lov_stripe_md *md, struct obd_trans_info *oti)
2154 {
2155         struct ldlm_res_id res_id = { .name = { oa->o_id, 0, oa->o_gr, 0 } };
2156         struct ldlm_valblock_ops *ns_lvbo;
2157         struct lvfs_run_ctxt saved;
2158         struct filter_obd *filter;
2159         struct ldlm_resource *res;
2160         struct dentry *dentry;
2161         int rc;
2162         ENTRY;
2163
2164         LASSERT(oti != NULL);
2165
2166         filter = &exp->exp_obd->u.filter;
2167         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2168
2169         /* make sure that object is allocated. */
2170         dentry = filter_crow_object(exp->exp_obd,
2171                                     oa->o_gr, oa->o_id);
2172         if (IS_ERR(dentry))
2173                 GOTO(out_pop, rc = PTR_ERR(dentry));
2174
2175         lock_kernel();
2176
2177         /* setting objects attributes (including owner/group) */
2178         rc = filter_setattr_internal(exp, dentry, oa, oti);
2179         if (rc)
2180                 GOTO(out_unlock, rc);
2181
2182         res = ldlm_resource_get(exp->exp_obd->obd_namespace, NULL,
2183                                 res_id, LDLM_EXTENT, 0);
2184
2185         if (res != NULL) {
2186                 ns_lvbo = res->lr_namespace->ns_lvbo;
2187                 if (ns_lvbo && ns_lvbo->lvbo_update)
2188                         rc = ns_lvbo->lvbo_update(res, NULL, 0, 0);
2189                 ldlm_resource_putref(res);
2190         }
2191
2192         oa->o_valid = OBD_MD_FLID;
2193         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2194
2195         EXIT;
2196 out_unlock:
2197         unlock_kernel();
2198         f_dput(dentry);
2199 out_pop:
2200         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2201         return rc;
2202 }
2203
2204 /* XXX identical to osc_unpackmd */
2205 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2206                            struct lov_mds_md *lmm, int lmm_bytes)
2207 {
2208         int lsm_size;
2209         ENTRY;
2210
2211         if (lmm != NULL) {
2212                 if (lmm_bytes < sizeof (*lmm)) {
2213                         CERROR("lov_mds_md too small: %d, need %d\n",
2214                                lmm_bytes, (int)sizeof(*lmm));
2215                         RETURN(-EINVAL);
2216                 }
2217                 /* XXX LOV_MAGIC etc check? */
2218
2219                 if (lmm->lmm_object_id == cpu_to_le64(0)) {
2220                         CERROR("lov_mds_md: zero lmm_object_id\n");
2221                         RETURN(-EINVAL);
2222                 }
2223         }
2224
2225         lsm_size = lov_stripe_md_size(1);
2226         if (lsmp == NULL)
2227                 RETURN(lsm_size);
2228
2229         if (*lsmp != NULL && lmm == NULL) {
2230                 OBD_FREE(*lsmp, lsm_size);
2231                 *lsmp = NULL;
2232                 RETURN(0);
2233         }
2234
2235         if (*lsmp == NULL) {
2236                 OBD_ALLOC(*lsmp, lsm_size);
2237                 if (*lsmp == NULL)
2238                         RETURN(-ENOMEM);
2239
2240                 loi_init((*lsmp)->lsm_oinfo);
2241         }
2242
2243         if (lmm != NULL) {
2244                 /* XXX zero *lsmp? */
2245                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
2246                 LASSERT((*lsmp)->lsm_object_id);
2247         }
2248
2249         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
2250
2251         RETURN(lsm_size);
2252 }
2253
2254 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
2255                          unsigned long max_age)
2256 {
2257         struct filter_obd *filter = &obd->u.filter;
2258         int blockbits = filter->fo_sb->s_blocksize_bits;
2259         int rc;
2260         ENTRY;
2261
2262         /* at least try to account for cached pages.  its still racey and
2263          * might be under-reporting if clients haven't announced their
2264          * caches with brw recently */
2265         spin_lock(&obd->obd_osfs_lock);
2266         rc = fsfilt_statfs(obd, filter->fo_sb, max_age);
2267         memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
2268         spin_unlock(&obd->obd_osfs_lock);
2269
2270         CDEBUG(D_SUPER | D_CACHE, "blocks cached "LPU64" granted "LPU64
2271                " pending "LPU64" free "LPU64" avail "LPU64"\n",
2272                filter->fo_tot_dirty, filter->fo_tot_granted,
2273                filter->fo_tot_pending,
2274                osfs->os_bfree << blockbits, osfs->os_bavail << blockbits);
2275
2276         filter_grant_sanity_check(obd, __FUNCTION__);
2277
2278         osfs->os_bavail -= min(osfs->os_bavail,
2279                                (filter->fo_tot_dirty + filter->fo_tot_pending +
2280                                 osfs->os_bsize -1) >> blockbits);
2281
2282         RETURN(rc);
2283 }
2284
2285 int filter_create_object(struct obd_device *obd, struct obdo *oa,
2286                          obd_gr group)
2287 {
2288         struct dentry *dparent = NULL;
2289         struct dentry *dchild = NULL;
2290         struct filter_obd *filter;
2291         struct obd_statfs *osfs;
2292         int cleanup_phase = 0;
2293         int err = 0, rc = 0;
2294         void *handle = NULL;
2295         void *lock = NULL;
2296         ENTRY;
2297
2298         filter = &obd->u.filter;
2299
2300         OBD_ALLOC(osfs, sizeof(*osfs));
2301         if (osfs == NULL)
2302                 RETURN(-ENOMEM);
2303         rc = filter_statfs(obd, osfs, jiffies - HZ);
2304         if (rc == 0 && osfs->os_bavail < (osfs->os_blocks >> 10)) {
2305                 CDEBUG(D_HA, "OST out of space! avail "LPU64"\n",
2306                        osfs->os_bavail << filter->fo_sb->s_blocksize_bits);
2307                 rc = -ENOSPC;
2308         }
2309         OBD_FREE(osfs, sizeof(*osfs));
2310         if (rc)
2311                 RETURN(rc);
2312
2313         down(&filter->fo_create_locks[group]);
2314
2315         if (test_bit(group, &filter->fo_destroys_in_progress)) {
2316                 CWARN("%s: precreate aborted by destroy\n",
2317                       obd->obd_name);
2318                 GOTO(out, rc = -EALREADY);
2319         }
2320
2321         CDEBUG(D_INFO, "precreate objid "LPU64"\n", oa->o_id);
2322
2323         dparent = filter_parent_lock(obd, group, oa->o_id, &lock);
2324         if (IS_ERR(dparent))
2325                 GOTO(cleanup, rc = PTR_ERR(dparent));
2326         cleanup_phase = 1;
2327
2328         dchild = filter_id2dentry(obd, dparent, group, oa->o_id);
2329         if (IS_ERR(dchild))
2330                 GOTO(cleanup, rc = PTR_ERR(dchild));
2331         cleanup_phase = 2;
2332
2333         if (dchild->d_inode != NULL) {
2334                 CERROR("%s: serious error: objid %.*s already "
2335                        "exists; is this filesystem corrupted?\n",
2336                        obd->obd_name, dchild->d_name.len,
2337                        dchild->d_name.name);
2338                 GOTO(cleanup, rc = -EEXIST);
2339         }
2340
2341         handle = fsfilt_start_log(obd, dparent->d_inode,
2342                                   FSFILT_OP_CREATE, NULL, 1);
2343         if (IS_ERR(handle))
2344                 GOTO(cleanup, rc = PTR_ERR(handle));
2345         cleanup_phase = 3;
2346
2347         rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
2348         if (rc) {
2349                 CERROR("create failed rc = %d\n", rc);
2350                 GOTO(cleanup, rc);
2351         }
2352
2353         fsfilt_set_fs_flags(obd, dparent->d_inode, SM_DO_REC);
2354
2355         if (oa->o_id > filter_last_id(filter, group)) {
2356                 /*
2357                  * saving last created object id, it will be needed in recovery
2358                  * for deleting orphanes.
2359                  */
2360                 filter_set_last_id(filter, group, oa->o_id);
2361
2362                 rc = filter_update_last_objid(obd, group, 0);
2363                 if (rc) {
2364                         CERROR("unable to write lastobjid, but "
2365                                "orphans were deleted, err = %d\n",
2366                                rc);
2367                         rc = 0;
2368                 }
2369         }
2370 cleanup:
2371         switch(cleanup_phase) {
2372         case 3:
2373                 err = fsfilt_commit(obd, filter->fo_sb,
2374                                     dparent->d_inode, handle, 0);
2375                 if (err) {
2376                         CERROR("error on commit, err = %d\n", err);
2377                         if (!rc)
2378                                 rc = err;
2379                 }
2380         case 2:
2381                 f_dput(dchild);
2382         case 1:
2383                 filter_parent_unlock(dparent, lock);
2384         case 0:
2385                 break;
2386         }
2387
2388         if (rc)
2389                 GOTO(out, rc);
2390
2391 out:
2392         up(&filter->fo_create_locks[group]);
2393         RETURN(rc);
2394 }
2395
2396 struct dentry *filter_crow_object(struct obd_device *obd,
2397                                   __u64 ogr, __u64 oid)
2398 {
2399         struct dentry *dentry;
2400         struct obdo *oa;
2401         int rc = 0;
2402         ENTRY;
2403
2404         /* check if object is already allocated */
2405         dentry = filter_id2dentry(obd, NULL, ogr, oid);
2406         if (IS_ERR(dentry))
2407                 RETURN(dentry);
2408
2409         if (dentry->d_inode)
2410                 RETURN(dentry);
2411
2412         f_dput(dentry);
2413
2414         /* allocate object as it does not exist */
2415         oa = obdo_alloc();
2416         if (oa == NULL)
2417                 RETURN(ERR_PTR(-ENOMEM));
2418
2419         oa->o_id = oid;
2420         oa->o_gr = ogr;
2421         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
2422
2423         CDEBUG(D_INODE, "OSS object "LPU64"/"LPU64
2424                " does not exists - allocate now\n",
2425                oid, ogr);
2426
2427         rc = filter_create_object(obd, oa, oa->o_gr);
2428         if (rc) {
2429                 CERROR("cannot create OSS object "LPU64"/"LPU64
2430                        ", err = %d\n", oa->o_id, oa->o_gr, rc);
2431                 GOTO(out_free_oa, dentry = ERR_PTR(rc));
2432         }
2433
2434         /* lookup for just created object and return it to caller */
2435         dentry = filter_id2dentry(obd, NULL, ogr, oid);
2436         if (IS_ERR(dentry))
2437                 GOTO(out_free_oa, dentry);
2438
2439         if (dentry->d_inode == NULL) {
2440                 f_dput(dentry);
2441                 dentry = ERR_PTR(-ENOENT);
2442                 CERROR("cannot find just created OSS object "
2443                        LPU64"/"LPU64" err = %d\n", oid,
2444                        ogr, (int)PTR_ERR(dentry));
2445                 GOTO(out_free_oa, dentry);
2446         }
2447
2448         EXIT;
2449 out_free_oa:
2450         obdo_free(oa);
2451         return dentry;
2452 }
2453
2454 static int
2455 filter_clear_orphans(struct obd_export *exp, struct obdo *oa)
2456 {
2457         struct obd_device *obd = NULL;
2458         struct filter_obd *filter;
2459         struct obdo *doa = NULL;
2460         int rc = 0, orphans;
2461         __u64 last, id;
2462         ENTRY;
2463
2464         LASSERT(oa);
2465         LASSERT(oa->o_gr != 0);
2466         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2467
2468         obd = exp->exp_obd;
2469         filter = &obd->u.filter;
2470
2471         last = filter_last_id(filter, oa->o_gr);
2472         orphans = last - oa->o_id;
2473
2474         if (orphans <= 0)
2475                 RETURN(0);
2476
2477         doa = obdo_alloc();
2478         if (doa == NULL)
2479                 RETURN(-ENOMEM);
2480
2481         doa->o_gr = oa->o_gr;
2482         doa->o_mode = S_IFREG;
2483         doa->o_valid = oa->o_valid & (OBD_MD_FLGROUP | OBD_MD_FLID);
2484
2485         set_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2486         down(&filter->fo_create_locks[doa->o_gr]);
2487         if (!test_bit(doa->o_gr, &filter->fo_destroys_in_progress)) {
2488                 CERROR("%s:["LPU64"] destroy_in_progress already cleared\n",
2489                        exp->exp_obd->obd_name, doa->o_gr);
2490                 up(&filter->fo_create_locks[doa->o_gr]);
2491                 GOTO(out_free_doa, 0);
2492         }
2493
2494         CWARN("%s:["LPU64"] deleting orphan objects from "LPU64" to "
2495               LPU64"\n", exp->exp_obd->obd_name, doa->o_gr,
2496               oa->o_id + 1, last);
2497
2498         for (id = oa->o_id + 1; id <= last; id++) {
2499                 doa->o_id = id;
2500                 filter_destroy(exp, doa, NULL, NULL);
2501         }
2502
2503         CDEBUG(D_HA, "%s:["LPU64"] after destroy: set last_objids = "
2504                LPU64"\n", exp->exp_obd->obd_name, doa->o_gr, oa->o_id);
2505
2506         filter_set_last_id(filter, oa->o_gr, oa->o_id);
2507         clear_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2508         up(&filter->fo_create_locks[oa->o_gr]);
2509
2510         EXIT;
2511 out_free_doa:
2512         obdo_free(doa);
2513         return rc;
2514 }
2515
2516 /*
2517  * by now this function is only needed as entry point for deleting orphanes on
2518  * OSS as objects are created on first write attempt. --umka
2519  */
2520 static int
2521 filter_create(struct obd_export *exp, struct obdo *oa, void *acl,
2522               int acl_size, struct lov_stripe_md **ea,
2523               struct obd_trans_info *oti)
2524 {
2525         struct filter_export_data *fed;
2526         struct obd_device *obd = NULL;
2527         int group = oa->o_gr, rc = 0;
2528         struct lvfs_run_ctxt saved;
2529         struct filter_obd *filter;
2530         char str[PTL_NALFMT_SIZE];
2531         ENTRY;
2532
2533         LASSERT(acl == NULL && acl_size == 0);
2534
2535         if (!(oa->o_valid & OBD_MD_FLGROUP) || group == 0) {
2536                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2537                                 exp->exp_connection->c_peer.peer_id.nid, str);
2538                 CERROR("!!! nid "LPX64"/%s sent invalid object group %d\n",
2539                        exp->exp_connection->c_peer.peer_id.nid, str, group);
2540                 RETURN(-EINVAL);
2541         }
2542
2543         obd = exp->exp_obd;
2544         fed = &exp->exp_filter_data;
2545         filter = &obd->u.filter;
2546
2547         if (fed->fed_group != group) {
2548                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2549                                 exp->exp_connection->c_peer.peer_id.nid, str);
2550                 CERROR("!!! this export (nid "LPX64"/%s) used object group %d "
2551                        "earlier; now it's trying to use group %d!  This could "
2552                        "be a bug in the MDS.  Tell CFS.\n",
2553                        exp->exp_connection->c_peer.peer_id.nid, str,
2554                        fed->fed_group, group);
2555                 RETURN(-ENOTUNIQ);
2556         }
2557
2558         CDEBUG(D_INFO, "filter_create(od->o_gr=%d,od->o_id="LPU64")\n",
2559                group, oa->o_id);
2560
2561         obd = exp->exp_obd;
2562         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2563
2564         LASSERT((oa->o_valid & OBD_MD_FLFLAGS) &&
2565                 (oa->o_flags == OBD_FL_DELORPHAN));
2566
2567         rc = filter_clear_orphans(exp, oa);
2568         if (rc) {
2569                 CERROR("cannot clear orphanes starting from "
2570                        LPU64", err = %d\n", oa->o_id, rc);
2571         } else {
2572                 rc = filter_update_last_objid(obd, group, 0);
2573                 if (rc) {
2574                         CERROR("unable to write lastobjid, but "
2575                                "orphans were deleted, err = %d\n",
2576                                rc);
2577                 }
2578         }
2579         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2580
2581         RETURN(0);
2582 }
2583
2584 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
2585                           struct lov_stripe_md *ea, struct obd_trans_info *oti)
2586 {
2587         int rc, rc2, cleanup_phase = 0, have_prepared = 0;
2588         struct dentry *dchild = NULL, *dparent = NULL;
2589         struct llog_cookie *fcc = NULL;
2590         struct lvfs_run_ctxt saved;
2591         struct filter_obd *filter;
2592         struct obd_device *obd;
2593         void *handle = NULL;
2594         void *lock = NULL;
2595         struct iattr iattr;
2596         ENTRY;
2597
2598         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2599
2600         obd = exp->exp_obd;
2601         filter = &obd->u.filter;
2602
2603         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2604
2605  acquire_locks:
2606         dparent = filter_parent_lock(obd, oa->o_gr, oa->o_id, &lock);
2607         if (IS_ERR(dparent))
2608                 GOTO(cleanup, rc = PTR_ERR(dparent));
2609         cleanup_phase = 1;
2610
2611         dchild = filter_id2dentry(obd, dparent, oa->o_gr, oa->o_id);
2612         if (IS_ERR(dchild))
2613                 GOTO(cleanup, rc = PTR_ERR(dchild));
2614         cleanup_phase = 2;
2615
2616         if (dchild->d_inode == NULL) {
2617                 CDEBUG(D_INODE, "destroying non-existent object "LPU64"\n",
2618                        oa->o_id);
2619                 GOTO(cleanup, rc = -ENOENT);
2620         }
2621
2622         if (!have_prepared) {
2623                 /* If we're really going to destroy the object, get ready
2624                  * by getting the clients to discard their cached data.
2625                  *
2626                  * We have to drop the parent lock, because
2627                  * filter_prepare_destroy will acquire a PW on the object, and
2628                  * we don't want to deadlock with an incoming write to the
2629                  * object, which has the extent PW and then wants to get the
2630                  * parent dentry to do the lookup.
2631                  *
2632                  * We dput the child because it's not worth the extra
2633                  * complication of condition the above code to skip it on the
2634                  * second time through. */
2635                 f_dput(dchild);
2636                 filter_parent_unlock(dparent, lock);
2637
2638                 filter_prepare_destroy(obd, oa->o_id, oa->o_gr);
2639                 have_prepared = 1;
2640                 goto acquire_locks;
2641         }
2642
2643         /* Our MDC connection is established by the MDS to us */
2644         if (oa->o_valid & OBD_MD_FLCOOKIE) {
2645                 OBD_ALLOC(fcc, sizeof(*fcc));
2646                 if (fcc != NULL)
2647                         memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
2648         }
2649
2650         /* we're gonna truncate it first in order to avoid possible
2651          * deadlock:
2652          *      P1                      P2
2653          * open trasaction      open transaction
2654          * down(i_zombie)       down(i_zombie)
2655          *                      restart transaction
2656          * (see BUG 4180) -bzzz
2657          */
2658         down(&dchild->d_inode->i_sem);
2659         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_SETATTR,NULL,1);
2660         if (IS_ERR(handle)) {
2661                 up(&dchild->d_inode->i_sem);
2662                 GOTO(cleanup, rc = PTR_ERR(handle));
2663         }
2664
2665         iattr.ia_valid = ATTR_SIZE;
2666         iattr.ia_size = 0;
2667         rc = fsfilt_setattr(obd, dchild, handle, &iattr, 1);
2668
2669         rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode, handle, 0);
2670         up(&dchild->d_inode->i_sem);
2671         if (rc)
2672                 GOTO(cleanup, rc);
2673         if (rc2)
2674                 GOTO(cleanup, rc = rc2);
2675
2676         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_UNLINK,oti,1);
2677         if (IS_ERR(handle))
2678                 GOTO(cleanup, rc = PTR_ERR(handle));
2679
2680         cleanup_phase = 3;
2681
2682         rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
2683
2684 cleanup:
2685         switch(cleanup_phase) {
2686         case 3:
2687                 if (fcc != NULL) {
2688                         fsfilt_add_journal_cb(obd, filter->fo_sb, 0,
2689                                               oti ? oti->oti_handle : handle,
2690                                               filter_cancel_cookies_cb, fcc);
2691                 }
2692                 rc = filter_finish_transno(exp, oti, rc);
2693                 rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode,
2694                                     handle, exp->exp_sync);
2695                 if (rc2) {
2696                         CERROR("error on commit, err = %d\n", rc2);
2697                         if (!rc)
2698                                 rc = rc2;
2699                 }
2700         case 2:
2701                 f_dput(dchild);
2702         case 1:
2703                 filter_parent_unlock(dparent, lock);
2704         case 0:
2705                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2706                 break;
2707         default:
2708                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2709                 LBUG();
2710         }
2711
2712         RETURN(rc);
2713 }
2714
2715 /* NB start and end are used for punch, but not truncate */
2716 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
2717                            struct lov_stripe_md *lsm,
2718                            obd_off start, obd_off end,
2719                            struct obd_trans_info *oti)
2720 {
2721         int error;
2722         ENTRY;
2723
2724         if (end != OBD_OBJECT_EOF)
2725                 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
2726                        end);
2727
2728         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = "LPU64", "
2729                "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
2730         oa->o_size = start;
2731         error = filter_setattr(exp, oa, NULL, oti);
2732         RETURN(error);
2733 }
2734
2735 static int filter_sync(struct obd_export *exp, struct obdo *oa,
2736                        struct lov_stripe_md *lsm, obd_off start, obd_off end)
2737 {
2738         struct obd_device *obd = exp->exp_obd;
2739         struct lvfs_run_ctxt saved;
2740         struct filter_obd *filter;
2741         struct dentry *dentry;
2742         int rc, rc2;
2743         ENTRY;
2744
2745         filter = &obd->u.filter;
2746
2747         /* an objid of zero is taken to mean "sync whole filesystem" */
2748         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
2749                 rc = fsfilt_sync(obd, filter->fo_sb);
2750                 /* flush any remaining cancel messages out to the target */
2751                 filter_sync_llogs(obd, NULL);
2752                 RETURN(rc);
2753         }
2754
2755         dentry = filter_oa2dentry(obd, oa);
2756         if (IS_ERR(dentry))
2757                 RETURN(PTR_ERR(dentry));
2758
2759         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2760
2761         down(&dentry->d_inode->i_sem);
2762         rc = filemap_fdatawrite(dentry->d_inode->i_mapping);
2763         if (rc == 0) {
2764                 /* just any file to grab fsync method - "file" arg unused */
2765                 struct file *file = filter->fo_rcvd_filp;
2766
2767                 if (file->f_op && file->f_op->fsync)
2768                         rc = file->f_op->fsync(NULL, dentry, 1);
2769
2770                 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
2771                 if (!rc)
2772                         rc = rc2;
2773         }
2774         up(&dentry->d_inode->i_sem);
2775
2776         oa->o_valid = OBD_MD_FLID;
2777         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2778
2779         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2780
2781         f_dput(dentry);
2782         RETURN(rc);
2783 }
2784
2785 static int filter_get_info(struct obd_export *exp, __u32 keylen,
2786                            void *key, __u32 *vallen, void *val)
2787 {
2788         struct filter_export_data *fed = &exp->exp_filter_data;
2789         struct obd_device *obd;
2790         ENTRY;
2791
2792         obd = class_exp2obd(exp);
2793         if (obd == NULL) {
2794                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2795                        exp->exp_handle.h_cookie);
2796                 RETURN(-EINVAL);
2797         }
2798
2799         if (keylen == strlen("blocksize") &&
2800             memcmp(key, "blocksize", keylen) == 0) {
2801                 __u32 *blocksize = val;
2802                 *vallen = sizeof(*blocksize);
2803                 *blocksize = obd->u.filter.fo_sb->s_blocksize;
2804                 RETURN(0);
2805         }
2806
2807         if (keylen == strlen("blocksize_bits") &&
2808             memcmp(key, "blocksize_bits", keylen) == 0) {
2809                 __u32 *blocksize_bits = val;
2810                 *vallen = sizeof(*blocksize_bits);
2811                 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
2812                 RETURN(0);
2813         }
2814
2815         if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
2816                 obd_id *last_id = val;
2817                 *last_id = filter_last_id(&obd->u.filter, fed->fed_group);
2818                 RETURN(0);
2819         }
2820         if (keylen >= strlen("reint_log") && memcmp(key, "reint_log", 9) == 0) {
2821                 /*Get log_context handle*/
2822                 unsigned long *llh_handle = val;
2823                 *vallen = sizeof(unsigned long);
2824                 *llh_handle = (unsigned long)obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT];
2825                 RETURN(0);
2826         }
2827         if (keylen >= strlen("cache_sb") && memcmp(key, "cache_sb", 8) == 0) {
2828                 /*Get log_context handle*/
2829                 unsigned long *sb = val;
2830                 *vallen = sizeof(unsigned long);
2831                 *sb = (unsigned long)obd->u.filter.fo_sb;
2832                 RETURN(0);
2833         }
2834
2835         CDEBUG(D_IOCTL, "invalid key\n");
2836         RETURN(-EINVAL);
2837 }
2838
2839 struct obd_llogs *filter_grab_llog_for_group(struct obd_device *obd, int group,
2840                                              struct obd_export *export)
2841 {
2842         struct filter_group_llog *fglog, *nlog;
2843         char name[32] = "CATLIST";
2844         struct filter_obd *filter;
2845         struct llog_ctxt *ctxt;
2846         struct list_head *cur;
2847         int rc;
2848
2849         filter = &obd->u.filter;
2850
2851         spin_lock(&filter->fo_llog_list_lock);
2852         list_for_each(cur, &filter->fo_llog_list) {
2853                 fglog = list_entry(cur, struct filter_group_llog, list);
2854                 if (fglog->group == group) {
2855                         if (!(fglog->exp == NULL || fglog->exp == export || export == NULL))
2856                                 CWARN("%s: export for group %d changes: 0x%p -> 0x%p\n",
2857                                       obd->obd_name, group, fglog->exp, export);
2858                         spin_unlock(&filter->fo_llog_list_lock);
2859                         goto init;
2860                 }
2861         }
2862         spin_unlock(&filter->fo_llog_list_lock);
2863
2864         if (export == NULL)
2865                 RETURN(NULL);
2866
2867         OBD_ALLOC(fglog, sizeof(*fglog));
2868         if (fglog == NULL)
2869                 RETURN(NULL);
2870         fglog->group = group;
2871
2872         OBD_ALLOC(fglog->llogs, sizeof(struct obd_llogs));
2873         if (fglog->llogs == NULL) {
2874                 OBD_FREE(fglog, sizeof(*fglog));
2875                 RETURN(NULL);
2876         }
2877
2878         spin_lock(&filter->fo_llog_list_lock);
2879         list_for_each(cur, &filter->fo_llog_list) {
2880                 nlog = list_entry(cur, struct filter_group_llog, list);
2881                 LASSERT(nlog->group != group);
2882         }
2883         list_add(&fglog->list, &filter->fo_llog_list);
2884         spin_unlock(&filter->fo_llog_list_lock);
2885
2886         rc = obd_llog_cat_initialize(obd, fglog->llogs, 1, name);
2887         if (rc) {
2888                 OBD_FREE(fglog->llogs, sizeof(*(fglog->llogs)));
2889                 OBD_FREE(fglog, sizeof(*fglog));
2890                 RETURN(NULL);
2891         }
2892
2893 init:
2894         if (export) {
2895                 fglog->exp = export;
2896                 ctxt = llog_get_context(fglog->llogs, LLOG_UNLINK_REPL_CTXT);
2897                 LASSERT(ctxt != NULL);
2898
2899                 llog_receptor_accept(ctxt, export->exp_imp_reverse);
2900         }
2901         CDEBUG(D_OTHER, "%s: new llog 0x%p for group %u\n",
2902                obd->obd_name, fglog->llogs, group);
2903
2904         RETURN(fglog->llogs);
2905 }
2906
2907 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
2908                      int len, void *karg, void *uarg)
2909 {
2910         struct obd_device *obd = exp->exp_obd;
2911         struct obd_ioctl_data *data = karg;
2912         int rc = 0;
2913
2914         switch (cmd) {
2915         case OBD_IOC_ABORT_RECOVERY:
2916                 target_stop_recovery_thread(obd);
2917                 RETURN(0);
2918
2919         case OBD_IOC_SET_READONLY: {
2920                 void *handle;
2921                 struct super_block *sb = obd->u.filter.fo_sb;
2922                 struct inode *inode = sb->s_root->d_inode;
2923                 BDEVNAME_DECLARE_STORAGE(tmp);
2924                 CERROR("setting device %s read-only\n",
2925                        ll_bdevname(sb, tmp));
2926
2927                 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
2928                 LASSERT(handle);
2929                 (void)fsfilt_commit(obd, sb, inode, handle, 1);
2930
2931                 ll_set_rdonly(ll_sbdev(obd->u.filter.fo_sb));
2932                 RETURN(0);
2933         }
2934
2935         case OBD_IOC_CATLOGLIST: {
2936                 rc = llog_catalog_list(obd, 1, data);
2937                 RETURN(rc);
2938         }
2939         case OBD_IOC_LLOG_CANCEL:
2940         case OBD_IOC_LLOG_REMOVE:
2941         case OBD_IOC_LLOG_INFO:
2942         case OBD_IOC_LLOG_PRINT: {
2943                 /* FIXME to be finished */
2944                 RETURN(-EOPNOTSUPP);
2945 /*
2946                 struct llog_ctxt *ctxt = NULL;
2947
2948                 push_ctxt(&saved, &ctxt->loc_ctxt, NULL);
2949                 rc = llog_ioctl(ctxt, cmd, data);
2950                 pop_ctxt(&saved, &ctxt->loc_ctxt, NULL);
2951
2952                 RETURN(rc);
2953 */
2954         }
2955
2956
2957         default:
2958                 RETURN(-EINVAL);
2959         }
2960         RETURN(0);
2961 }
2962
2963 static struct llog_operations filter_unlink_repl_logops;
2964 static struct llog_operations filter_size_orig_logops = {
2965         lop_setup: llog_obd_origin_setup,
2966         lop_cleanup: llog_catalog_cleanup,
2967         lop_add: llog_catalog_add,
2968 };
2969
2970 static int filter_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
2971                             struct obd_device *tgt, int count,
2972                             struct llog_catid *catid)
2973 {
2974         struct llog_ctxt *ctxt;
2975         int rc;
2976         ENTRY;
2977
2978         filter_unlink_repl_logops = llog_client_ops;
2979         filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
2980         filter_unlink_repl_logops.lop_connect = llog_repl_connect;
2981         filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
2982
2983         rc = obd_llog_setup(obd, llogs, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
2984                         &filter_unlink_repl_logops);
2985         if (rc)
2986                 RETURN(rc);
2987         /* FIXME - assign unlink_cb for filter's recovery */
2988         ctxt = llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT);
2989         ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
2990
2991         /* FIXME - count should be 1 to setup size log */
2992         rc = obd_llog_setup(obd, llogs, LLOG_SIZE_ORIG_CTXT, tgt, 0,
2993                             &catid->lci_logid, &filter_size_orig_logops);
2994         RETURN(rc);
2995 }
2996
2997 static int filter_llog_finish(struct obd_device *obd,
2998                               struct obd_llogs *llogs, int count)
2999 {
3000         int rc;
3001         ENTRY;
3002
3003         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT));
3004         if (rc)
3005                 RETURN(rc);
3006
3007         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_SIZE_ORIG_CTXT));
3008         RETURN(rc);
3009 }
3010
3011 static int filter_llog_connect(struct obd_export *exp,
3012                                struct llogd_conn_body *body)
3013 {
3014         struct obd_device *obd = exp->exp_obd;
3015         struct llog_ctxt *ctxt;
3016         struct obd_llogs *llog;
3017         int rc;
3018         ENTRY;
3019
3020         CDEBUG(D_OTHER, "handle connect for %s: %u/%u/%u\n", obd->obd_name,
3021                (unsigned) body->lgdc_logid.lgl_ogr,
3022                (unsigned) body->lgdc_logid.lgl_oid,
3023                (unsigned) body->lgdc_logid.lgl_ogen);
3024         llog = filter_grab_llog_for_group(obd, body->lgdc_logid.lgl_ogr, exp);
3025         LASSERT(llog != NULL);
3026         ctxt = llog_get_context(llog, body->lgdc_ctxt_idx);
3027         rc = llog_connect(ctxt, 1, &body->lgdc_logid,
3028                           &body->lgdc_gen, NULL);
3029         if (rc != 0)
3030                 CERROR("failed to connect\n");
3031
3032         RETURN(rc);
3033 }
3034
3035 static struct dentry *filter_lvfs_id2dentry(__u64 id, __u32 gen,
3036                                             __u64 gr, void *data)
3037 {
3038         return filter_id2dentry(data, NULL, gr, id);
3039 }
3040
3041 static struct lvfs_callback_ops filter_lvfs_ops = {
3042         l_id2dentry:     filter_lvfs_id2dentry,
3043 };
3044
3045 static struct obd_ops filter_obd_ops = {
3046         .o_owner          = THIS_MODULE,
3047         .o_attach         = filter_attach,
3048         .o_detach         = filter_detach,
3049         .o_get_info       = filter_get_info,
3050         .o_setup          = filter_setup,
3051         .o_precleanup     = filter_precleanup,
3052         .o_cleanup        = filter_cleanup,
3053         .o_process_config = filter_process_config,
3054         .o_connect        = filter_connect,
3055         .o_connect_post   = filter_connect_post,
3056         .o_disconnect     = filter_disconnect,
3057         .o_statfs         = filter_statfs,
3058         .o_getattr        = filter_getattr,
3059         .o_unpackmd       = filter_unpackmd,
3060         .o_create         = filter_create,
3061         .o_setattr        = filter_setattr,
3062         .o_destroy        = filter_destroy,
3063         .o_brw            = filter_brw,
3064         .o_punch          = filter_truncate,
3065         .o_sync           = filter_sync,
3066         .o_preprw         = filter_preprw,
3067         .o_commitrw       = filter_commitrw,
3068         .o_do_cow         = filter_do_cow,
3069         .o_write_extents  = filter_write_extents,
3070         .o_destroy_export = filter_destroy_export,
3071         .o_llog_init      = filter_llog_init,
3072         .o_llog_finish    = filter_llog_finish,
3073         .o_llog_connect   = filter_llog_connect,
3074         .o_iocontrol      = filter_iocontrol,
3075 };
3076
3077 static struct obd_ops filter_sanobd_ops = {
3078         .o_owner          = THIS_MODULE,
3079         .o_attach         = filter_attach,
3080         .o_detach         = filter_detach,
3081         .o_get_info       = filter_get_info,
3082         .o_setup          = filter_san_setup,
3083         .o_precleanup     = filter_precleanup,
3084         .o_cleanup        = filter_cleanup,
3085         .o_connect        = filter_connect,
3086         .o_connect_post   = filter_connect_post,
3087         .o_disconnect     = filter_disconnect,
3088         .o_statfs         = filter_statfs,
3089         .o_getattr        = filter_getattr,
3090         .o_unpackmd       = filter_unpackmd,
3091         .o_create         = filter_create,
3092         .o_setattr        = filter_setattr,
3093         .o_destroy        = filter_destroy,
3094         .o_brw            = filter_brw,
3095         .o_punch          = filter_truncate,
3096         .o_sync           = filter_sync,
3097         .o_preprw         = filter_preprw,
3098         .o_commitrw       = filter_commitrw,
3099         .o_do_cow         = filter_do_cow,
3100         .o_write_extents  = filter_write_extents,
3101         .o_san_preprw     = filter_san_preprw,
3102         .o_destroy_export = filter_destroy_export,
3103         .o_llog_init      = filter_llog_init,
3104         .o_llog_finish    = filter_llog_finish,
3105         .o_llog_connect   = filter_llog_connect,
3106         .o_iocontrol      = filter_iocontrol,
3107 };
3108
3109 static int __init obdfilter_init(void)
3110 {
3111         struct lprocfs_static_vars lvars;
3112         int size, rc;
3113
3114         printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
3115
3116         lprocfs_init_vars(filter, &lvars);
3117
3118         size = OBDFILTER_CREATED_SCRATCHPAD_ENTRIES *
3119                 sizeof(*obdfilter_created_scratchpad);
3120
3121         OBD_ALLOC(obdfilter_created_scratchpad, size);
3122         if (obdfilter_created_scratchpad == NULL) {
3123                 CERROR ("Can't allocate scratchpad\n");
3124                 return -ENOMEM;
3125         }
3126
3127         rc = class_register_type(&filter_obd_ops, NULL, lvars.module_vars,
3128                                  OBD_FILTER_DEVICENAME);
3129         if (rc) {
3130                 OBD_FREE(obdfilter_created_scratchpad, size);
3131                 return rc;
3132         }
3133
3134         rc = class_register_type(&filter_sanobd_ops, NULL, lvars.module_vars,
3135                                  OBD_FILTER_SAN_DEVICENAME);
3136         if (rc) {
3137                 class_unregister_type(OBD_FILTER_DEVICENAME);
3138                 OBD_FREE(obdfilter_created_scratchpad, size);
3139         }
3140         return rc;
3141 }
3142
3143 static void __exit obdfilter_exit(void)
3144 {
3145         class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
3146         class_unregister_type(OBD_FILTER_DEVICENAME);
3147         OBD_FREE(obdfilter_created_scratchpad,
3148                  OBDFILTER_CREATED_SCRATCHPAD_ENTRIES *
3149                  sizeof(*obdfilter_created_scratchpad));
3150 }
3151
3152 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
3153 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
3154 MODULE_LICENSE("GPL");
3155
3156 module_init(obdfilter_init);
3157 module_exit(obdfilter_exit);