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] = simple_mkdir(dentry, dir, 0700, 1);
 699                         if (IS_ERR(tmp_subdirs->dentry[i])) {
 700                                 rc = PTR_ERR(tmp_subdirs->dentry[i]);
 701                                 CERROR("can't lookup/create O/%d/%s: rc = %d\n",
 702                                        group, dir, rc);
 703                                 GOTO(cleanup, rc);
 704                         }
 705
 706                         /* turn on smfs plugins if any */
 707                         fsfilt_set_fs_flags(obd, tmp_subdirs->dentry[i]->d_inode,
 708                                             SM_ALL_PLG);
 709
 710                         CDEBUG(D_INODE, "got/created O/%d/%s: %p\n", group, dir,
 711                                tmp_subdirs->dentry[i]);
 712                 }
 713         }
 714
 715         /* 'group' is an index; we need an array of length 'group + 1' */
 716         if (group + 1 > old_count) {
 717                 int len = group + 1;
 718                 OBD_ALLOC(new_objids, len * sizeof(*new_objids));
 719                 OBD_ALLOC(new_subdirs, len * sizeof(*new_subdirs));
 720                 OBD_ALLOC(new_groups, len * sizeof(*new_groups));
 721                 OBD_ALLOC(new_files, len * sizeof(*new_files));
 722                 stage = 4;
 723                 if (new_objids == NULL || new_subdirs == NULL ||
 724                     new_groups == NULL || new_files == NULL)
 725                         GOTO(cleanup, rc = -ENOMEM);
 726
 727                 memcpy(new_objids, filter->fo_last_objids,
 728                        old_count * sizeof(*new_objids));
 729                 memcpy(new_subdirs, filter->fo_subdirs,
 730                        old_count * sizeof(*new_subdirs));
 731                 memcpy(new_groups, filter->fo_groups,
 732                        old_count * sizeof(*new_groups));
 733                 memcpy(new_files, filter->fo_last_objid_files,
 734                        old_count * sizeof(*new_files));
 735
 736                 if (old_count) {
 737                         OBD_FREE(filter->fo_last_objids,
 738                                  old_count * sizeof(*new_objids));
 739                         OBD_FREE(filter->fo_subdirs,
 740                                  old_count * sizeof(*new_subdirs));
 741                         OBD_FREE(filter->fo_groups,
 742                                  old_count * sizeof(*new_groups));
 743                         OBD_FREE(filter->fo_last_objid_files,
 744                                  old_count * sizeof(*new_files));
 745                 }
 746                 filter->fo_last_objids = new_objids;
 747                 filter->fo_subdirs = new_subdirs;
 748                 filter->fo_groups = new_groups;
 749                 filter->fo_last_objid_files = new_files;
 750                 filter->fo_group_count = len;
 751         }
 752
 753         filter->fo_groups[group] = dentry;
 754         filter->fo_last_objid_files[group] = filp;
 755         if (filter->fo_subdir_count) {
 756                 filter->fo_subdirs[group] = *tmp_subdirs;
 757                 OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
 758         }
 759
 760         filter_update_last_group(obd, group);
 761
 762         if (filp->f_dentry->d_inode->i_size == 0) {
 763                 filter->fo_last_objids[group] = FILTER_INIT_OBJID;
 764                 RETURN(0);
 765         }
 766
 767         filter->fo_last_objids[group] = le64_to_cpu(last_objid);
 768         CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
 769                obd->obd_name, group, last_objid);
 770         RETURN(0);
 771  cleanup:
 772         switch (stage) {
 773         case 4:
 774                 if (new_objids != NULL)
 775                         OBD_FREE(new_objids, group * sizeof(*new_objids));
 776                 if (new_subdirs != NULL)
 777                         OBD_FREE(new_subdirs, group * sizeof(*new_subdirs));
 778                 if (new_groups != NULL)
 779                         OBD_FREE(new_groups, group * sizeof(*new_groups));
 780                 if (new_files != NULL)
 781                         OBD_FREE(new_files, group * sizeof(*new_files));
 782         case 3:
 783                 if (filter->fo_subdir_count) {
 784                         for (i = 0; i < filter->fo_subdir_count; i++) {
 785                                 if (tmp_subdirs->dentry[i] != NULL)
 786                                         dput(tmp_subdirs->dentry[i]);
 787                         }
 788                         OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
 789                 }
 790         case 2:
 791                 filp_close(filp, 0);
 792         case 1:
 793                 dput(dentry);
 794         }
 795         RETURN(rc);
 796 }
 797
 798 static int filter_read_groups(struct obd_device *obd, int last_group,
 799                               int create)
 800 {
 801         struct filter_obd *filter = &obd->u.filter;
 802         int old_count, group, rc = 0;
 803
 804         down(&filter->fo_init_lock);
 805         old_count = filter->fo_group_count;
 806         for (group = old_count; group <= last_group; group++) {
 807                 if (group == 0)
 808                         continue; /* no group zero */
 809
 810                 rc = filter_read_group_internal(obd, group, create);
 811                 if (rc != 0)
 812                         break;
 813         }
 814         up(&filter->fo_init_lock);
 815         return rc;
 816 }
 817
 818 static int filter_prep_groups(struct obd_device *obd)
 819 {
 820         struct filter_obd *filter = &obd->u.filter;
 821         struct dentry *dentry, *O_dentry;
 822         int rc = 0, cleanup_phase = 0;
 823         struct file *filp = NULL;
 824         int last_group;
 825         loff_t off = 0;
 826         ENTRY;
 827
 828         O_dentry = simple_mkdir(current->fs->pwd, "O", 0700, 1);
 829         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
 830         if (IS_ERR(O_dentry)) {
 831                 rc = PTR_ERR(O_dentry);
 832                 CERROR("cannot open/create O: rc = %d\n", rc);
 833                 GOTO(cleanup, rc);
 834         }
 835         filter->fo_dentry_O = O_dentry;
 836         cleanup_phase = 1; /* O_dentry */
 837
 838         /* Lookup "R" to tell if we're on an old OST FS and need to convert
 839          * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
 840          * some time post 1.0 when all old-style OSTs have converted along
 841          * with the init_objid hack. */
 842         dentry = ll_lookup_one_len("R", O_dentry, 1);
 843         if (IS_ERR(dentry))
 844                 GOTO(cleanup, rc = PTR_ERR(dentry));
 845         if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
 846                 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
 847                 ENTRY;
 848
 849                 CWARN("converting OST to new object layout\n");
 850                 if (IS_ERR(O0_dentry)) {
 851                         rc = PTR_ERR(O0_dentry);
 852                         CERROR("error looking up O/0: rc %d\n", rc);
 853                         GOTO(cleanup_R, rc);
 854                 }
 855
 856                 if (O0_dentry->d_inode) {
 857                         CERROR("Both O/R and O/0 exist. Fix manually.\n");
 858                         GOTO(cleanup_O0, rc = -EEXIST);
 859                 }
 860
 861                 down(&O_dentry->d_inode->i_sem);
 862                 rc = vfs_rename(O_dentry->d_inode, dentry,
 863                                 O_dentry->d_inode, O0_dentry);
 864                 up(&O_dentry->d_inode->i_sem);
 865
 866                 if (rc) {
 867                         CERROR("error renaming O/R to O/0: rc %d\n", rc);
 868                         GOTO(cleanup_O0, rc);
 869                 }
 870                 filter->fo_fsd->fsd_feature_incompat |=
 871                         cpu_to_le32(FILTER_INCOMPAT_GROUPS);
 872                 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
 873                                                filter->fo_fsd, 1);
 874                 GOTO(cleanup_O0, rc);
 875
 876         cleanup_O0:
 877                 f_dput(O0_dentry);
 878         cleanup_R:
 879                 f_dput(dentry);
 880                 if (rc)
 881                         GOTO(cleanup, rc);
 882         } else {
 883                 f_dput(dentry);
 884         }
 885
 886         cleanup_phase = 2; /* groups */
 887
 888         /* we have to initialize all groups before first connections from
 889          * clients because they may send create/destroy for any group -bzzz */
 890         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
 891         if (IS_ERR(filp)) {
 892                 CERROR("cannot create LAST_GROUP: rc = %ld\n", PTR_ERR(filp));
 893                 GOTO(cleanup, rc = PTR_ERR(filp));
 894         }
 895         cleanup_phase = 3; /* filp */
 896
 897         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
 898         if (rc) {
 899                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n", rc);
 900                 GOTO(cleanup, rc);
 901         }
 902         if (off == 0) {
 903                 last_group = FILTER_MIN_GROUPS;
 904         } else {
 905                 LASSERT(last_group >= FILTER_MIN_GROUPS);
 906         }
 907
 908         CWARN("%s: initialize groups [%d,%d]\n", obd->obd_name,
 909               FILTER_MIN_GROUPS, last_group);
 910         filter->fo_committed_group = last_group;
 911         rc = filter_read_groups(obd, last_group, 1);
 912         if (rc)
 913                 GOTO(cleanup, rc);
 914
 915         filp_close(filp, 0);
 916         RETURN(0);
 917
 918  cleanup:
 919         switch (cleanup_phase) {
 920         case 3:
 921                 filp_close(filp, 0);
 922         case 2:
 923                 filter_cleanup_groups(obd);
 924         case 1:
 925                 f_dput(filter->fo_dentry_O);
 926                 filter->fo_dentry_O = NULL;
 927         default:
 928                 break;
 929         }
 930         return rc;
 931 }
 932
 933
 934 /* setup the object store with correct subdirectories */
 935 static int filter_prep(struct obd_device *obd)
 936 {
 937         struct lvfs_run_ctxt saved;
 938         struct filter_obd *filter = &obd->u.filter;
 939         struct file *file;
 940         struct inode *inode;
 941         int rc = 0;
 942         ENTRY;
 943
 944         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 945         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 946         if (!file || IS_ERR(file)) {
 947                 rc = PTR_ERR(file);
 948                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 949                        LAST_RCVD, rc);
 950                 GOTO(out, rc);
 951         }
 952
 953         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 954                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
 955                        file->f_dentry->d_inode->i_mode);
 956                 GOTO(err_filp, rc = -ENOENT);
 957         }
 958
 959         /* steal operations */
 960         inode = file->f_dentry->d_inode;
 961         filter->fo_fop = file->f_op;
 962         filter->fo_iop = inode->i_op;
 963         filter->fo_aops = inode->i_mapping->a_ops;
 964
 965         rc = filter_init_server_data(obd, file);
 966         if (rc) {
 967                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
 968                 GOTO(err_filp, rc);
 969         }
 970         filter->fo_rcvd_filp = file;
 971
 972         rc = filter_prep_groups(obd);
 973         if (rc)
 974                 GOTO(err_server_data, rc);
 975
 976  out:
 977         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 978
 979         return(rc);
 980
 981  err_server_data:
 982         //class_disconnect_exports(obd, 0);
 983         filter_free_server_data(filter);
 984  err_filp:
 985         if (filp_close(file, 0))
 986                 CERROR("can't close %s after error\n", LAST_RCVD);
 987         filter->fo_rcvd_filp = NULL;
 988         goto out;
 989 }
 990
 991 /* cleanup the filter: write last used object id to status file */
 992 static void filter_post(struct obd_device *obd)
 993 {
 994         struct lvfs_run_ctxt saved;
 995         struct filter_obd *filter = &obd->u.filter;
 996         int rc, i;
 997
 998         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
 999          * best to start a transaction with h_sync, because we removed this
1000          * from lastobjid */
1001
1002         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1003         rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
1004                                        filter->fo_fsd, 0);
1005         if (rc)
1006                 CERROR("error writing server data: rc = %d\n", rc);
1007
1008         for (i = 1; i < filter->fo_group_count; i++) {
1009                 rc = filter_update_last_objid(obd, i,
1010                                              (i == filter->fo_group_count - 1));
1011                 if (rc)
1012                         CERROR("error writing group %d lastobjid: rc = %d\n",
1013                                i, rc);
1014         }
1015
1016         rc = filp_close(filter->fo_rcvd_filp, 0);
1017         filter->fo_rcvd_filp = NULL;
1018         if (rc)
1019                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
1020
1021         filter_cleanup_groups(obd);
1022         filter_free_server_data(filter);
1023         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1024
1025         filter_free_capa_keys(filter);
1026 }
1027
1028 static void filter_set_last_id(struct filter_obd *filter, int group, obd_id id)
1029 {
1030         LASSERT(filter->fo_fsd != NULL);
1031         LASSERT(group > 0);
1032         LASSERT(group < filter->fo_group_count);
1033
1034         spin_lock(&filter->fo_objidlock);
1035         filter->fo_last_objids[group] = id;
1036         spin_unlock(&filter->fo_objidlock);
1037 }
1038
1039 __u64 filter_last_id(struct filter_obd *filter, int group)
1040 {
1041         obd_id id;
1042         LASSERT(filter->fo_fsd != NULL);
1043         LASSERT(group > 0);
1044         LASSERT(group < filter->fo_group_count);
1045
1046         spin_lock(&filter->fo_objidlock);
1047         id = filter->fo_last_objids[group];
1048         spin_unlock(&filter->fo_objidlock);
1049
1050         return id;
1051 }
1052
1053 static void filter_save_last_id(struct filter_obd *filter, int group, obd_id id)
1054 {
1055         LASSERT(group > 0);
1056         LASSERT(group < filter->fo_group_count);
1057
1058         spin_lock(&filter->fo_lastidlock);
1059         if (id > filter_last_id(filter, group))
1060                 filter_set_last_id(filter, group, id);
1061         spin_unlock(&filter->fo_lastidlock);
1062 }
1063
1064 /* direct cut-n-paste of mds_blocking_ast() */
1065 static int filter_blocking_ast(struct ldlm_lock *lock,
1066                                struct ldlm_lock_desc *desc,
1067                                void *data, int flag)
1068 {
1069         int do_ast;
1070         ENTRY;
1071
1072         if (flag == LDLM_CB_CANCELING) {
1073                 /* Don't need to do anything here. */
1074                 RETURN(0);
1075         }
1076
1077         /* XXX layering violation!  -phil */
1078         lock_res_and_lock(lock);
1079         /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
1080          * such that filter_blocking_ast is called just before l_i_p takes the
1081          * ns_lock, then by the time we get the lock, we might not be the
1082          * correct blocking function anymore.  So check, and return early, if
1083          * so. */
1084         if (lock->l_blocking_ast != filter_blocking_ast) {
1085                 unlock_res_and_lock(lock);
1086                 RETURN(0);
1087         }
1088
1089         lock->l_flags |= LDLM_FL_CBPENDING;
1090         do_ast = (!lock->l_readers && !lock->l_writers);
1091         unlock_res_and_lock(lock);
1092
1093         if (do_ast) {
1094                 struct lustre_handle lockh;
1095                 int rc;
1096
1097                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
1098                 ldlm_lock2handle(lock, &lockh);
1099                 rc = ldlm_cli_cancel(&lockh);
1100                 if (rc < 0)
1101                         CERROR("ldlm_cli_cancel: %d\n", rc);
1102         } else {
1103                 LDLM_DEBUG(lock, "Lock still has references, will be "
1104                            "cancelled later");
1105         }
1106         RETURN(0);
1107 }
1108
1109 extern void *lock_dir(struct inode *dir, struct qstr *name);
1110 extern void unlock_dir(struct inode *dir, void *lock);
1111
1112 static void *filter_lock_dentry(struct obd_device *obd,
1113                                 struct dentry *dparent,
1114                                 obd_id id)
1115 {
1116 #ifdef S_PDIROPS
1117         struct qstr qstr;
1118         char name[32];
1119         int len;
1120
1121         len = sprintf(name, LPU64, id);
1122         qstr_assign(&qstr, (char *)name, len);
1123         return lock_dir(dparent->d_inode, &qstr);
1124 #else
1125         down(&dparent->d_inode->i_sem);
1126 #endif
1127         return 0;
1128 }
1129
1130 /* We never dget the object parent, so DON'T dput it either */
1131 static void filter_parent_unlock(struct dentry *dparent, void *lock)
1132 {
1133 #ifdef S_PDIROPS
1134         LASSERT(lock != NULL);
1135         unlock_dir(dparent->d_inode, lock);
1136 #else
1137         up(&dparent->d_inode->i_sem);
1138 #endif
1139 }
1140
1141 /* We never dget the object parent, so DON'T dput it either */
1142 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
1143 {
1144         struct filter_obd *filter = &obd->u.filter;
1145         LASSERTF(group < filter->fo_group_count,
1146                  "group %d < filter->fo_group_count %d failed\n",
1147                  (int)group, (int)filter->fo_group_count);
1148         LASSERTF(group > 0, "group %d > 0 failed\n", (int)group);
1149
1150         if (filter->fo_subdir_count == 0)
1151                 return filter->fo_groups[group];
1152
1153         return filter->fo_subdirs[group].dentry[objid & (filter->fo_subdir_count - 1)];
1154 }
1155
1156 /* We never dget the object parent, so DON'T dput it either */
1157 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
1158                                   obd_id objid, void **lock)
1159 {
1160         unsigned long now = jiffies;
1161         struct dentry *dparent = filter_parent(obd, group, objid);
1162
1163         if (IS_ERR(dparent))
1164                 return dparent;
1165
1166         LASSERT(dparent);
1167         LASSERT(dparent->d_inode);
1168
1169         *lock = filter_lock_dentry(obd, dparent, objid);
1170         fsfilt_check_slow(now, obd_timeout, "parent lock");
1171         return dparent;
1172 }
1173
1174 /* How to get files, dentries, inodes from object id's.
1175  *
1176  * If dir_dentry is passed, the caller has already locked the parent
1177  * appropriately for this operation (normally a write lock).  If
1178  * dir_dentry is NULL, we do a read lock while we do the lookup to
1179  * avoid races with create/destroy and such changing the directory
1180  * internal to the filesystem code. */
1181 struct dentry *filter_id2dentry(struct obd_device *obd,
1182                                 struct dentry *dir_dentry,
1183                                 obd_gr group, obd_id id)
1184 {
1185         struct dentry *dparent = dir_dentry;
1186         struct dentry *dchild;
1187         void *lock = NULL;
1188         char name[32];
1189         int len;
1190         ENTRY;
1191
1192         if (id == 0) {
1193                 CERROR("fatal: invalid object id 0\n");
1194                 RETURN(ERR_PTR(-ESTALE));
1195         }
1196
1197         len = sprintf(name, LPU64, id);
1198         if (dir_dentry == NULL) {
1199                 dparent = filter_parent_lock(obd, group, id, &lock);
1200                 if (IS_ERR(dparent)) {
1201                         CERROR("%s: error getting object "LPU64":"LPU64
1202                                " parent: rc %ld\n", obd->obd_name,
1203                                id, group, PTR_ERR(dparent));
1204                         RETURN(dparent);
1205                 }
1206         }
1207         CDEBUG(D_INODE, "looking up object O/%.*s/%s\n",
1208                dparent->d_name.len, dparent->d_name.name, name);
1209         dchild = /*ll_*/lookup_one_len(name, dparent, len);
1210         if (dir_dentry == NULL)
1211                 filter_parent_unlock(dparent, lock);
1212         if (IS_ERR(dchild)) {
1213                 CERROR("%s: child lookup error %ld\n", obd->obd_name,
1214                        PTR_ERR(dchild));
1215                 RETURN(dchild);
1216         }
1217
1218         if (dchild->d_inode != NULL && is_bad_inode(dchild->d_inode)) {
1219                 CERROR("%s: got bad inode "LPU64"\n", obd->obd_name, id);
1220                 f_dput(dchild);
1221                 RETURN(ERR_PTR(-ENOENT));
1222         }
1223
1224         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1225                name, dchild, atomic_read(&dchild->d_count));
1226
1227         LASSERT(atomic_read(&dchild->d_count) > 0);
1228
1229         RETURN(dchild);
1230 }
1231
1232 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
1233                                   obd_id group)
1234 {
1235         struct lustre_handle lockh;
1236         int flags = LDLM_AST_DISCARD_DATA, rc;
1237         struct ldlm_res_id res_id = { .name = { objid, 0, group, 0 } };
1238         ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
1239
1240         ENTRY;
1241         /* Tell the clients that the object is gone now and that they should
1242          * throw away any cached pages. */
1243         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, res_id,
1244                               LDLM_EXTENT, &policy, LCK_PW,
1245                               &flags, filter_blocking_ast, ldlm_completion_ast,
1246                               NULL, NULL, NULL, 0, NULL, &lockh);
1247
1248         /* We only care about the side-effects, just drop the lock. */
1249         if (rc == ELDLM_OK)
1250                 ldlm_lock_decref(&lockh, LCK_PW);
1251
1252         RETURN(rc);
1253 }
1254
1255 /* Caller must hold LCK_PW on parent and push us into kernel context.
1256  * Caller is also required to ensure that dchild->d_inode exists. */
1257 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1258                                    struct dentry *dparent,
1259                                    struct dentry *dchild)
1260 {
1261         struct inode *inode = dchild->d_inode;
1262         int rc;
1263         ENTRY;
1264
1265         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1266                 CERROR("destroying objid %.*s nlink = %lu, count = %d\n",
1267                        dchild->d_name.len, dchild->d_name.name,
1268                        (unsigned long)inode->i_nlink,
1269                        atomic_read(&inode->i_count));
1270         }
1271
1272         rc = vfs_unlink(dparent->d_inode, dchild);
1273
1274         if (rc)
1275                 CERROR("error unlinking objid %.*s: rc %d\n",
1276                        dchild->d_name.len, dchild->d_name.name, rc);
1277
1278         RETURN(rc);
1279 }
1280
1281 static int filter_intent_policy(struct ldlm_namespace *ns,
1282                                 struct ldlm_lock **lockp, void *req_cookie,
1283                                 ldlm_mode_t mode, int flags, void *data)
1284 {
1285         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1286         struct ptlrpc_request *req = req_cookie;
1287         struct ldlm_lock *lock = *lockp, *l = NULL;
1288         struct ldlm_resource *res = lock->l_resource;
1289         ldlm_processing_policy policy;
1290         struct ost_lvb *res_lvb, *reply_lvb;
1291         struct ldlm_reply *rep;
1292         struct list_head *tmp;
1293         ldlm_error_t err;
1294         int tmpflags = 0, rc, repsize[2] = {sizeof(*rep), sizeof(*reply_lvb)};
1295         ENTRY;
1296
1297         policy = ldlm_get_processing_policy(res);
1298         LASSERT(policy != NULL);
1299         LASSERT(req != NULL);
1300
1301         rc = lustre_pack_reply(req, 2, repsize, NULL);
1302         if (rc)
1303                 RETURN(req->rq_status = rc);
1304
1305         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*rep));
1306         LASSERT(rep != NULL);
1307
1308         reply_lvb = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*reply_lvb));
1309         LASSERT(reply_lvb != NULL);
1310
1311         //fixup_handle_for_resent_req(req, lock, &lockh);
1312
1313         /* If we grant any lock at all, it will be a whole-file read lock.
1314          * Call the extent policy function to see if our request can be
1315          * granted, or is blocked. */
1316         lock->l_policy_data.l_extent.start = 0;
1317         lock->l_policy_data.l_extent.end = OBD_OBJECT_EOF;
1318         lock->l_req_mode = LCK_PR;
1319
1320         lock_res_and_lock(lock);
1321         res = lock->l_resource;
1322         rc = policy(lock, &tmpflags, 0, &err, &rpc_list);
1323
1324         /* FIXME: we should change the policy function slightly, to not make
1325          * this list at all, since we just turn around and free it */
1326         while (!list_empty(&rpc_list)) {
1327                 struct ldlm_lock *wlock =
1328                         list_entry(rpc_list.next, struct ldlm_lock, l_cp_ast);
1329                 LASSERT((lock->l_flags & LDLM_FL_AST_SENT) == 0);
1330                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1331                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1332                 list_del_init(&wlock->l_cp_ast);
1333                 LDLM_LOCK_PUT(wlock);
1334         }
1335
1336         if (rc == LDLM_ITER_CONTINUE) {
1337                 /* The lock met with no resistance; we're finished. */
1338                 unlock_res_and_lock(lock);
1339                 RETURN(ELDLM_LOCK_REPLACED);
1340         }
1341
1342         /* Do not grant any lock, but instead send GL callbacks.  The extent
1343          * policy nicely created a list of all PW locks for us.  We will choose
1344          * the highest of those which are larger than the size in the LVB, if
1345          * any, and perform a glimpse callback. */
1346         res_lvb = res->lr_lvb_data;
1347         LASSERT(res_lvb != NULL);
1348         *reply_lvb = *res_lvb;
1349
1350         list_for_each(tmp, &res->lr_granted) {
1351                 struct ldlm_lock *tmplock =
1352                         list_entry(tmp, struct ldlm_lock, l_res_link);
1353
1354                 if (tmplock->l_granted_mode == LCK_PR)
1355                         continue;
1356
1357                 if (tmplock->l_policy_data.l_extent.end <= reply_lvb->lvb_size)
1358                         continue;
1359
1360                 if (l == NULL) {
1361                         l = LDLM_LOCK_GET(tmplock);
1362                         continue;
1363                 }
1364
1365                 if (l->l_policy_data.l_extent.start >
1366                     tmplock->l_policy_data.l_extent.start)
1367                         continue;
1368
1369                 LDLM_LOCK_PUT(l);
1370                 l = LDLM_LOCK_GET(tmplock);
1371         }
1372         unlock_res(res);
1373
1374         /* There were no PW locks beyond the size in the LVB; finished. */
1375         if (l == NULL)
1376                 RETURN(ELDLM_LOCK_ABORTED);
1377
1378         if (l->l_glimpse_ast == NULL) {
1379                 /* We are racing with unlink(); just return -ENOENT */
1380                 CDEBUG(D_OTHER, "race with unlink: "LPX64"/"LPX64"\n",
1381                        res->lr_name.name[0], res->lr_name.name[2]);
1382                 rep->lock_policy_res1 = -ENOENT;
1383                 goto out;
1384         }
1385
1386         LASSERTF(l->l_glimpse_ast != NULL, "l == %p", l);
1387
1388         rc = l->l_glimpse_ast(l, NULL); /* this will update the LVB */
1389         if (rc != 0 && res->lr_namespace->ns_lvbo &&
1390             res->lr_namespace->ns_lvbo->lvbo_update) {
1391                 res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
1392         }
1393
1394         lock_res(res);
1395         *reply_lvb = *res_lvb;
1396         unlock_res(res);
1397 out:
1398         LDLM_LOCK_PUT(l);
1399
1400         RETURN(ELDLM_LOCK_ABORTED);
1401 }
1402
1403 static int filter_post_fs_cleanup(struct obd_device *obd)
1404 {
1405         int rc = 0;
1406
1407         rc = fsfilt_post_cleanup(obd);
1408
1409         RETURN(rc);
1410 }
1411
1412 static int filter_post_fs_setup(struct obd_device *obd)
1413 {
1414         struct filter_obd *filter = &obd->u.filter;
1415         int rc = 0;
1416         ENTRY;
1417
1418         rc = fsfilt_post_setup(obd, filter->fo_dentry_O);
1419
1420         RETURN(rc);
1421 }
1422
1423 /* mount the file system (secretly) */
1424 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1425                         char *option)
1426 {
1427         struct lustre_cfg *lcfg = buf;
1428         struct filter_obd *filter = &obd->u.filter;
1429         struct lvfs_obd_ctxt *lvfs_ctxt = NULL;
1430         struct vfsmount *mnt;
1431         char *str;
1432         char ns_name[48];
1433         int rc = 0, i;
1434         ENTRY;
1435
1436         if ((LUSTRE_CFG_BUFLEN(lcfg, 1)) < 1 ||
1437             (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1))
1438                 RETURN(-EINVAL);
1439
1440         obd->obd_fsops = fsfilt_get_ops(lustre_cfg_string(lcfg, 2));
1441         if (IS_ERR(obd->obd_fsops))
1442                 RETURN(PTR_ERR(obd->obd_fsops));
1443
1444         rc = lvfs_mount_fs(lustre_cfg_string(lcfg, 1),
1445                            lustre_cfg_string(lcfg, 2),
1446                            option, MS_NOATIME | MS_NODIRATIME, &lvfs_ctxt);
1447         if (rc) {
1448                 CERROR("lvfs_mount_fs failed: rc = %d\n", rc);
1449                 GOTO(err_ops, rc);
1450         }
1451         LASSERT(lvfs_ctxt);
1452
1453         mnt = lvfs_ctxt->loc_mnt;
1454         filter->fo_lvfs_ctxt = lvfs_ctxt;
1455
1456         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0 && lustre_cfg_buf(lcfg, 3)) {
1457                 str = lustre_cfg_string(lcfg, 3);
1458                 if (*str == 'f') {
1459                         obd->obd_replayable = 1;
1460                         obd_sync_filter = 1;
1461                         CWARN("%s: recovery enabled\n", obd->obd_name);
1462                 } else {
1463                         if (*str != 'n') {
1464                                 CERROR("unrecognised flag '%c'\n",
1465                                        *str);
1466                         }
1467                         // XXX Robert? Why do we get errors here
1468                         // GOTO(err_mntput, rc = -EINVAL);
1469                 }
1470         }
1471
1472         filter->fo_vfsmnt = mnt;
1473         filter->fo_sb = mnt->mnt_sb;
1474         filter->fo_fstype = mnt->mnt_sb->s_type->name;
1475         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1476
1477         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1478         obd->obd_lvfs_ctxt.pwdmnt = mnt;
1479         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
1480         obd->obd_lvfs_ctxt.fs = get_ds();
1481         obd->obd_lvfs_ctxt.cb_ops = filter_lvfs_ops;
1482
1483         ll_clear_rdonly(ll_sbdev(filter->fo_sb));
1484
1485         rc = fsfilt_setup(obd, mnt->mnt_sb);
1486         if (rc)
1487                 GOTO(err_mntput, rc);
1488
1489         sema_init(&filter->fo_init_lock, 1);
1490         filter->fo_committed_group = 0;
1491
1492         INIT_LIST_HEAD(&filter->fo_capa_keys);
1493         spin_lock_init(&filter->fo_capa_lock);
1494
1495         rc = filter_prep(obd);
1496         if (rc)
1497                 GOTO(err_mntput, rc);
1498
1499         filter->fo_destroys_in_progress = 0;
1500         for (i = 0; i < 32; i++)
1501                 sema_init(&filter->fo_create_locks[i], 1);
1502
1503         spin_lock_init(&filter->fo_translock);
1504         spin_lock_init(&filter->fo_objidlock);
1505         spin_lock_init(&filter->fo_lastidlock);
1506         INIT_LIST_HEAD(&filter->fo_export_list);
1507         sema_init(&filter->fo_alloc_lock, 1);
1508         spin_lock_init(&filter->fo_r_pages.oh_lock);
1509         spin_lock_init(&filter->fo_w_pages.oh_lock);
1510         spin_lock_init(&filter->fo_r_discont_pages.oh_lock);
1511         spin_lock_init(&filter->fo_w_discont_pages.oh_lock);
1512         spin_lock_init(&filter->fo_r_discont_blocks.oh_lock);
1513         spin_lock_init(&filter->fo_w_discont_blocks.oh_lock);
1514         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
1515
1516         INIT_LIST_HEAD(&filter->fo_llog_list);
1517         spin_lock_init(&filter->fo_llog_list_lock);
1518
1519         spin_lock_init(&filter->fo_denylist_lock);
1520         INIT_LIST_HEAD(&filter->fo_denylist);
1521
1522         sprintf(ns_name, "filter-%s", obd->obd_uuid.uuid);
1523         obd->obd_namespace = ldlm_namespace_new(ns_name, LDLM_NAMESPACE_SERVER);
1524
1525         if (obd->obd_namespace == NULL)
1526                 GOTO(err_post, rc = -ENOMEM);
1527         obd->obd_namespace->ns_lvbp = obd;
1528         obd->obd_namespace->ns_lvbo = &filter_lvbo;
1529         ldlm_register_intent(obd->obd_namespace, filter_intent_policy);
1530
1531         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1532                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1533
1534         rc = obd_llog_cat_initialize(obd, &obd->obd_llogs, 1, CATLIST);
1535         if (rc) {
1536                 CERROR("failed to setup llogging subsystems\n");
1537                 GOTO(err_post, rc);
1538         }
1539         RETURN(0);
1540
1541 err_post:
1542         filter_post(obd);
1543 err_mntput:
1544         unlock_kernel();
1545         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1546         filter->fo_sb = 0;
1547         lock_kernel();
1548 err_ops:
1549         fsfilt_put_ops(obd->obd_fsops);
1550         return rc;
1551 }
1552
1553 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1554 {
1555         struct lprocfs_static_vars lvars;
1556         int rc;
1557
1558         lprocfs_init_vars(filter, &lvars);
1559         rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1560         if (rc != 0)
1561                 return rc;
1562
1563         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1564         if (rc != 0)
1565                 return rc;
1566
1567         /* Init obdfilter private stats here */
1568         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1569                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1570         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1571                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1572
1573         return lproc_filter_attach_seqstat(obd);
1574 }
1575
1576 static int filter_detach(struct obd_device *dev)
1577 {
1578         lprocfs_free_obd_stats(dev);
1579         return lprocfs_obd_detach(dev);
1580 }
1581
1582 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1583 {
1584         struct lustre_cfg *lcfg = buf;
1585         unsigned long page;
1586         int rc;
1587         ENTRY;
1588
1589         /* 2.6.9 selinux wants a full option page for do_kern_mount (bug6471) */
1590         page = get_zeroed_page(GFP_KERNEL);
1591         if (!page)
1592                 RETURN(-ENOMEM);
1593
1594         memcpy((void *)page, lustre_cfg_buf(lcfg, 4),
1595                LUSTRE_CFG_BUFLEN(lcfg, 4));
1596
1597         /* all mount options including errors=remount-ro and asyncdel are passed
1598          * using 4th lcfg param. And it is good, finally we have got rid of
1599          * hardcoded fs types in the code. */
1600         rc = filter_common_setup(obd, len, buf, (void *)page);
1601         free_page(page);
1602
1603         if (rc)
1604                 RETURN(rc);
1605         rc = filter_post_fs_setup(obd);
1606         RETURN(rc);
1607 }
1608
1609 static int filter_cleanup(struct obd_device *obd, int flags)
1610 {
1611         struct filter_obd *filter = &obd->u.filter;
1612         ll_sbdev_type save_dev;
1613         ENTRY;
1614
1615         if (flags & OBD_OPT_FAILOVER)
1616                 CERROR("%s: shutting down for failover; client state will"
1617                        " be preserved.\n", obd->obd_name);
1618
1619         if (!list_empty(&obd->obd_exports)) {
1620                 CERROR("%s: still has clients!\n", obd->obd_name);
1621                 class_disconnect_exports(obd, flags);
1622                 if (!list_empty(&obd->obd_exports)) {
1623                         CERROR("still has exports after forced cleanup?\n");
1624                         RETURN(-EBUSY);
1625                 }
1626         }
1627
1628         target_cleanup_recovery(obd);
1629
1630         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1631
1632         if (filter->fo_sb == NULL)
1633                 RETURN(0);
1634
1635         save_dev = ll_sbdev(filter->fo_sb);
1636         filter_post_fs_cleanup(obd);
1637         filter_post(obd);
1638
1639         shrink_dcache_parent(filter->fo_sb->s_root);
1640         filter->fo_sb = 0;
1641
1642         spin_lock(&filter->fo_denylist_lock);
1643         while (!list_empty(&filter->fo_denylist)) {
1644                 deny_sec_t *p_deny_sec = list_entry(filter->fo_denylist.next,
1645                                                     deny_sec_t, list);
1646                 list_del(&p_deny_sec->list);
1647                 OBD_FREE(p_deny_sec, sizeof(*p_deny_sec));
1648         }
1649         spin_unlock(&filter->fo_denylist_lock);
1650
1651         unlock_kernel();
1652         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1653         //destroy_buffers(filter->fo_sb->s_dev);
1654         filter->fo_sb = NULL;
1655         fsfilt_put_ops(obd->obd_fsops);
1656         lock_kernel();
1657
1658         ll_clear_rdonly(save_dev);
1659
1660         RETURN(0);
1661 }
1662
1663 static int filter_process_config(struct obd_device *obd, obd_count len, void *buf)
1664 {
1665         struct lustre_cfg *lcfg = buf;
1666         struct filter_obd *filter = &obd->u.filter;
1667         int rc = 0;
1668         ENTRY;
1669
1670         switch(lcfg->lcfg_command) {
1671         case LCFG_SET_SECURITY: {
1672                 if ((LUSTRE_CFG_BUFLEN(lcfg, 1) == 0) ||
1673                     (LUSTRE_CFG_BUFLEN(lcfg, 2) == 0))
1674                         GOTO(out, rc = -EINVAL);
1675
1676                 if (!strcmp(lustre_cfg_string(lcfg, 1), "deny_sec")){
1677                         spin_lock(&filter->fo_denylist_lock);
1678                         rc = add_deny_security(lustre_cfg_string(lcfg, 2),
1679                                                &filter->fo_denylist);
1680                         spin_unlock(&filter->fo_denylist_lock);
1681                 }else {
1682                         CERROR("Unrecognized key\n");
1683                         rc = -EINVAL;
1684                 }
1685                 break;
1686         }
1687         default: {
1688                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1689                 GOTO(out, rc = -EINVAL);
1690
1691         }
1692         }
1693 out:
1694         RETURN(rc);
1695 }
1696
1697 static int filter_connect_post(struct obd_export *exp, unsigned initial,
1698                                unsigned long connect_flags)
1699 {
1700         struct obd_device *obd = exp->exp_obd;
1701         struct filter_export_data *fed;
1702         char str[PTL_NALFMT_SIZE];
1703         struct obd_llogs *llog;
1704         struct llog_ctxt *ctxt;
1705         int rc = 0;
1706         ENTRY;
1707
1708         fed = &exp->exp_filter_data;
1709         if (fed->fed_group < FILTER_MIN_GROUPS)
1710                 RETURN(0);
1711
1712         /* initialize llogs for connections from MDS */
1713         llog = filter_grab_llog_for_group(obd, fed->fed_group, exp);
1714         LASSERT(llog != NULL);
1715
1716         ctxt = llog_get_context(llog, LLOG_UNLINK_REPL_CTXT);
1717         LASSERT(ctxt != NULL);
1718
1719         rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
1720
1721         portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1722                         exp->exp_connection->c_peer.peer_id.nid, str);
1723
1724         CDEBUG(D_OTHER, "%s: init llog ctxt for export "LPX64"/%s, group %d\n",
1725                obd->obd_name, exp->exp_connection->c_peer.peer_id.nid,
1726                str, fed->fed_group);
1727
1728         RETURN(rc);
1729 }
1730
1731 /* nearly identical to mds_connect */
1732 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1733                           struct obd_uuid *cluuid,
1734                           struct obd_connect_data *data,
1735                           unsigned long connect_flags)
1736 {
1737         struct obd_export *exp;
1738         struct filter_export_data *fed;
1739         struct filter_client_data *fcd = NULL;
1740         struct filter_obd *filter = &obd->u.filter;
1741         struct lvfs_run_ctxt saved;
1742         int rc, group;
1743         ENTRY;
1744
1745         if (conn == NULL || obd == NULL || cluuid == NULL)
1746                 RETURN(-EINVAL);
1747
1748         rc = class_connect(conn, obd, cluuid);
1749         if (rc)
1750                 RETURN(rc);
1751         exp = class_conn2export(conn);
1752         LASSERT(exp != NULL);
1753
1754         fed = &exp->exp_filter_data;
1755
1756         spin_lock_init(&fed->fed_lock);
1757
1758        /* connection from MDS */
1759         group = connect_flags;
1760         if (obd->obd_replayable) {
1761                 OBD_ALLOC(fcd, sizeof(*fcd));
1762                 if (!fcd) {
1763                         CERROR("filter: out of memory for client data\n");
1764                         GOTO(cleanup, rc = -ENOMEM);
1765                 }
1766
1767                 memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1768                 fed->fed_fcd = fcd;
1769                 fed->fed_fcd->fcd_group = group;
1770                 rc = filter_client_add(obd, filter, fed, -1);
1771                 if (rc)
1772                         GOTO(cleanup, rc);
1773         }
1774         CWARN("%s: Received MDS connection ("LPX64"); group %d\n",
1775               obd->obd_name, exp->exp_handle.h_cookie, group);
1776
1777         if (group == 0)
1778                 GOTO(cleanup, rc);
1779
1780         if (fed->fed_group != 0 && fed->fed_group != group) {
1781                 char str[PTL_NALFMT_SIZE];
1782                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1783                                 exp->exp_connection->c_peer.peer_id.nid, str);
1784                 CERROR("!!! This export (nid "LPX64"/%s) used object group %d "
1785                        "earlier; now it's trying to use group %d!  This could "
1786                        "be a bug in the MDS.  Tell CFS.\n",
1787                        exp->exp_connection->c_peer.peer_id.nid, str,
1788                        fed->fed_group, group);
1789                 GOTO(cleanup, rc = -EPROTO);
1790         }
1791         fed->fed_group = group;
1792
1793         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1794         rc = filter_read_groups(obd, group, 1);
1795         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1796         if (rc != 0) {
1797                 CERROR("can't read group %u\n", group);
1798                 GOTO(cleanup, rc);
1799         }
1800 cleanup:
1801         if (rc) {
1802                 if (fcd)
1803                         OBD_FREE(fcd, sizeof(*fcd));
1804                 class_disconnect(exp, 0);
1805         } else {
1806                 class_export_put(exp);
1807         }
1808         return rc;
1809 }
1810
1811 static int filter_precleanup(struct obd_device *obd, int flags)
1812 {
1813         struct filter_group_llog *log;
1814         struct filter_obd *filter;
1815         int rc = 0;
1816         ENTRY;
1817
1818         filter = &obd->u.filter;
1819
1820         spin_lock(&filter->fo_llog_list_lock);
1821         while (!list_empty(&filter->fo_llog_list)) {
1822                 log = list_entry(filter->fo_llog_list.next,
1823                                  struct filter_group_llog, list);
1824                 list_del(&log->list);
1825                 spin_unlock(&filter->fo_llog_list_lock);
1826
1827                 rc = obd_llog_finish(obd, log->llogs, 0);
1828                 if (rc)
1829                         CERROR("failed to cleanup llogging subsystem for %u\n",
1830                                 log->group);
1831                 OBD_FREE(log->llogs, sizeof(*(log->llogs)));
1832                 OBD_FREE(log, sizeof(*log));
1833                 spin_lock(&filter->fo_llog_list_lock);
1834         }
1835         spin_unlock(&filter->fo_llog_list_lock);
1836
1837         rc = obd_llog_finish(obd, &obd->obd_llogs, 0);
1838         if (rc)
1839                 CERROR("failed to cleanup llogging subsystem\n");
1840
1841         RETURN(rc);
1842 }
1843
1844 /* Do extra sanity checks for grant accounting.  We do this at connect,
1845  * disconnect, and statfs RPC time, so it shouldn't be too bad.  We can
1846  * always get rid of it or turn it off when we know accounting is good. */
1847 static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
1848 {
1849         struct filter_export_data *fed;
1850         struct obd_export *exp;
1851         obd_size maxsize = obd->obd_osfs.os_blocks * obd->obd_osfs.os_bsize;
1852         obd_size tot_dirty = 0, tot_pending = 0, tot_granted = 0;
1853         obd_size fo_tot_dirty, fo_tot_pending, fo_tot_granted;
1854         int level = D_CACHE;
1855
1856         if (list_empty(&obd->obd_exports))
1857                 return;
1858
1859         spin_lock(&obd->obd_osfs_lock);
1860         spin_lock(&obd->obd_dev_lock);
1861         list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
1862                 fed = &exp->exp_filter_data;
1863                 if (fed->fed_grant < 0 || fed->fed_pending < 0 ||
1864                     fed->fed_dirty < 0)
1865                         level = D_ERROR;
1866                 if (maxsize > 0) { /* we may not have done a statfs yet */
1867                         LASSERTF(fed->fed_grant + fed->fed_pending <= maxsize,
1868                                  "cli %s/%p %ld+%ld > "LPU64"\n",
1869                                  exp->exp_client_uuid.uuid, exp,
1870                                  fed->fed_grant, fed->fed_pending, maxsize);
1871                         LASSERTF(fed->fed_dirty <= maxsize,
1872                                  "cli %s/%p %ld > "LPU64"\n",
1873                                  exp->exp_client_uuid.uuid, exp,
1874                                  fed->fed_dirty, maxsize);
1875                 }
1876                 CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1877                        obd->obd_name, exp->exp_client_uuid.uuid, exp,
1878                        fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1879                 tot_granted += fed->fed_grant + fed->fed_pending;
1880                 tot_pending += fed->fed_pending;
1881                 tot_dirty += fed->fed_dirty;
1882         }
1883         fo_tot_granted = obd->u.filter.fo_tot_granted;
1884         fo_tot_pending = obd->u.filter.fo_tot_pending;
1885         fo_tot_dirty = obd->u.filter.fo_tot_dirty;
1886         spin_unlock(&obd->obd_dev_lock);
1887         spin_unlock(&obd->obd_osfs_lock);
1888
1889         /* Do these assertions outside the spinlocks so we don't kill system */
1890         if (tot_granted != fo_tot_granted)
1891                 CERROR("%s: tot_granted "LPU64" != fo_tot_granted "LPU64"\n",
1892                        func, tot_granted, fo_tot_granted);
1893         if (tot_pending != fo_tot_pending)
1894                 CERROR("%s: tot_pending "LPU64" != fo_tot_pending "LPU64"\n",
1895                        func, tot_pending, fo_tot_pending);
1896         if (tot_dirty != fo_tot_dirty)
1897                 CERROR("%s: tot_dirty "LPU64" != fo_tot_dirty "LPU64"\n",
1898                        func, tot_dirty, fo_tot_dirty);
1899         if (tot_pending > tot_granted)
1900                 CERROR("%s: tot_pending "LPU64" > tot_granted "LPU64"\n",
1901                        func, tot_pending, tot_granted);
1902         if (tot_granted > maxsize)
1903                 CERROR("%s: tot_granted "LPU64" > maxsize "LPU64"\n",
1904                        func, tot_granted, maxsize);
1905         if (tot_dirty > maxsize)
1906                 CERROR("%s: tot_dirty "LPU64" > maxsize "LPU64"\n",
1907                        func, tot_dirty, maxsize);
1908 }
1909
1910 /* Remove this client from the grant accounting totals.  We also remove
1911  * the export from the obd device under the osfs and dev locks to ensure
1912  * that the filter_grant_sanity_check() calculations are always valid.
1913  * The client should do something similar when it invalidates its import. */
1914 static void filter_grant_discard(struct obd_export *exp)
1915 {
1916         struct obd_device *obd = exp->exp_obd;
1917         struct filter_obd *filter = &obd->u.filter;
1918         struct filter_export_data *fed = &exp->exp_filter_data;
1919         int level = D_CACHE;
1920
1921         spin_lock(&obd->obd_osfs_lock);
1922         spin_lock(&exp->exp_obd->obd_dev_lock);
1923         list_del_init(&exp->exp_obd_chain);
1924         spin_unlock(&exp->exp_obd->obd_dev_lock);
1925
1926         if (fed->fed_dirty < 0 || fed->fed_grant < 0 || fed->fed_pending < 0)
1927                 level = D_ERROR;
1928         CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1929                obd->obd_name, exp->exp_client_uuid.uuid, exp,
1930                fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1931
1932         LASSERTF(filter->fo_tot_granted >= fed->fed_grant,
1933                  "%s: tot_granted "LPU64" cli %s/%p fed_grant %ld\n",
1934                  obd->obd_name, filter->fo_tot_granted,
1935                  exp->exp_client_uuid.uuid, exp, fed->fed_grant);
1936         filter->fo_tot_granted -= fed->fed_grant;
1937         LASSERTF(filter->fo_tot_pending >= fed->fed_pending,
1938                  "%s: tot_pending "LPU64" cli %s/%p fed_pending %ld\n",
1939                  obd->obd_name, filter->fo_tot_pending,
1940                  exp->exp_client_uuid.uuid, exp, fed->fed_pending);
1941         LASSERTF(filter->fo_tot_dirty >= fed->fed_dirty,
1942                  "%s: tot_dirty "LPU64" cli %s/%p fed_dirty %ld\n",
1943                  obd->obd_name, filter->fo_tot_dirty,
1944                  exp->exp_client_uuid.uuid, exp, fed->fed_dirty);
1945         filter->fo_tot_dirty -= fed->fed_dirty;
1946         fed->fed_dirty = 0;
1947         fed->fed_grant = 0;
1948
1949         spin_unlock(&obd->obd_osfs_lock);
1950 }
1951
1952 static int filter_destroy_export(struct obd_export *exp)
1953 {
1954         ENTRY;
1955
1956         if (exp->exp_filter_data.fed_pending)
1957                 CERROR("%s: cli %s/%p has %lu pending on destroyed export\n",
1958                        exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
1959                        exp, exp->exp_filter_data.fed_pending);
1960
1961         target_destroy_export(exp);
1962
1963         if (exp->exp_obd->obd_replayable)
1964                 filter_client_free(exp, exp->exp_flags);
1965
1966         filter_grant_discard(exp);
1967         if (!(exp->exp_flags & OBD_OPT_FORCE))
1968                 filter_grant_sanity_check(exp->exp_obd, __FUNCTION__);
1969
1970         RETURN(0);
1971 }
1972
1973 static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
1974 {
1975         struct filter_group_llog *fglog, *nlog;
1976         struct filter_obd *filter;
1977         int worked = 0, group;
1978         struct llog_ctxt *ctxt;
1979         ENTRY;
1980
1981         filter = &obd->u.filter;
1982
1983         /* we can't sync log holding spinlock. also, we do not want to get
1984          * into livelock. so we do following: loop over MDS's exports in
1985          * group order and skip already synced llogs -bzzz */
1986         do {
1987                 /* look for group with min. number, but > worked */
1988                 fglog = NULL;
1989                 group = 1 << 30;
1990                 spin_lock(&filter->fo_llog_list_lock);
1991                 list_for_each_entry(nlog, &filter->fo_llog_list, list) {
1992
1993                         if (nlog->group <= worked) {
1994                                 /* this group is already synced */
1995                                 continue;
1996                         }
1997
1998                         if (group < nlog->group) {
1999                                 /* we have group with smaller number to sync */
2000                                 continue;
2001                         }
2002
2003                         /* store current minimal group */
2004                         fglog = nlog;
2005                         group = nlog->group;
2006                 }
2007                 spin_unlock(&filter->fo_llog_list_lock);
2008
2009                 if (fglog == NULL)
2010                         break;
2011
2012                 worked = fglog->group;
2013                 if (fglog->exp && (dexp == fglog->exp || dexp == NULL)) {
2014                         ctxt = llog_get_context(fglog->llogs,
2015                                         LLOG_UNLINK_REPL_CTXT);
2016                         LASSERT(ctxt != NULL);
2017                         llog_sync(ctxt, fglog->exp);
2018                 }
2019         } while (fglog != NULL);
2020 }
2021
2022 /* also incredibly similar to mds_disconnect */
2023 static int filter_disconnect(struct obd_export *exp, unsigned long flags)
2024 {
2025         struct obd_device *obd = exp->exp_obd;
2026         unsigned long irqflags;
2027         int rc;
2028         ENTRY;
2029
2030         LASSERT(exp);
2031         class_export_get(exp);
2032
2033         spin_lock_irqsave(&exp->exp_lock, irqflags);
2034         exp->exp_flags = flags;
2035         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
2036
2037         if (!(flags & OBD_OPT_FORCE))
2038                 filter_grant_sanity_check(obd, __FUNCTION__);
2039         filter_grant_discard(exp);
2040
2041         /* Disconnect early so that clients can't keep using export */
2042         rc = class_disconnect(exp, flags);
2043
2044         ldlm_cancel_locks_for_export(exp);
2045
2046         fsfilt_sync(obd, obd->u.filter.fo_sb);
2047
2048         /* flush any remaining cancel messages out to the target */
2049         filter_sync_llogs(obd, exp);
2050         class_export_put(exp);
2051         RETURN(rc);
2052 }
2053
2054 struct dentry *__filter_oa2dentry(struct obd_device *obd,
2055                                   struct obdo *oa, const char *what)
2056 {
2057         struct dentry *dchild = NULL;
2058         obd_gr group = 0;
2059         ENTRY;
2060
2061         if (oa->o_valid & OBD_MD_FLGROUP)
2062                 group = oa->o_gr;
2063
2064         dchild = filter_id2dentry(obd, NULL, group, oa->o_id);
2065
2066         if (IS_ERR(dchild)) {
2067                 CERROR("%s error looking up object: "LPU64"\n",
2068                        what, oa->o_id);
2069                 RETURN(dchild);
2070         }
2071
2072         if (dchild->d_inode == NULL) {
2073                 CDEBUG(D_INFO, "%s: %s on non-existent object: "
2074                        LPU64"\n", obd->obd_name, what, oa->o_id);
2075                 f_dput(dchild);
2076                 RETURN(ERR_PTR(-ENOENT));
2077         }
2078
2079         RETURN(dchild);
2080 }
2081
2082 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
2083                           struct lov_stripe_md *md)
2084 {
2085         struct dentry *dentry = NULL;
2086         struct obd_device *obd;
2087         int rc = 0;
2088         ENTRY;
2089
2090         obd = class_exp2obd(exp);
2091         if (obd == NULL) {
2092                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2093                        exp->exp_handle.h_cookie);
2094                 RETURN(-EINVAL);
2095         }
2096
2097         dentry = filter_oa2dentry(obd, oa);
2098         if (IS_ERR(dentry))
2099                 RETURN(PTR_ERR(dentry));
2100
2101         /* Limit the valid bits in the return data to what we actually use */
2102         oa->o_valid = OBD_MD_FLID;
2103         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2104
2105         f_dput(dentry);
2106         RETURN(rc);
2107 }
2108
2109 int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
2110                             struct obdo *oa, struct obd_trans_info *oti)
2111 {
2112         struct filter_obd *filter;
2113         struct iattr iattr;
2114         void *handle;
2115         int rc, err;
2116         ENTRY;
2117
2118         LASSERT(dentry != NULL);
2119         LASSERT(!IS_ERR(dentry));
2120         LASSERT(dentry->d_inode != NULL);
2121
2122         filter = &exp->exp_obd->u.filter;
2123         iattr_from_obdo(&iattr, oa, oa->o_valid);
2124
2125         if (iattr.ia_valid & ATTR_SIZE)
2126                 down(&dentry->d_inode->i_sem);
2127         handle = fsfilt_start(exp->exp_obd, dentry->d_inode,
2128                               FSFILT_OP_SETATTR, oti);
2129         if (IS_ERR(handle))
2130                 GOTO(out_unlock, rc = PTR_ERR(handle));
2131
2132         /* XXX this could be a rwsem instead, if filter_preprw played along */
2133         if (iattr.ia_valid & ATTR_ATTR_FLAG)
2134                 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode,
2135                                       NULL, EXT3_IOC_SETFLAGS,
2136                                       (long)&iattr.ia_attr_flags);
2137         else
2138                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle,
2139                                     &iattr, 1);
2140
2141         rc = filter_finish_transno(exp, oti, rc);
2142
2143         err = fsfilt_commit(exp->exp_obd, filter->fo_sb,
2144                             dentry->d_inode, handle,
2145                             exp->exp_sync);
2146         if (err) {
2147                 CERROR("error on commit, err = %d\n", err);
2148                 if (!rc)
2149                         rc = err;
2150         }
2151         EXIT;
2152 out_unlock:
2153         if (iattr.ia_valid & ATTR_SIZE)
2154                 up(&dentry->d_inode->i_sem);
2155         return rc;
2156 }
2157
2158 /* this is called from filter_truncate() until we have filter_punch() */
2159 int filter_setattr(struct obd_export *exp, struct obdo *oa,
2160                    struct lov_stripe_md *md, struct obd_trans_info *oti,
2161                    struct lustre_capa *capa)
2162 {
2163         struct ldlm_res_id res_id = { .name = { oa->o_id, 0, oa->o_gr, 0 } };
2164         struct ldlm_valblock_ops *ns_lvbo;
2165         struct lvfs_run_ctxt saved;
2166         struct filter_obd *filter;
2167         struct ldlm_resource *res;
2168         struct dentry *dentry;
2169         /*obd_uid uid;*/
2170         /*obd_gid gid;*/
2171         int rc;
2172         ENTRY;
2173
2174         LASSERT(oti != NULL);
2175
2176         filter = &exp->exp_obd->u.filter;
2177         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2178         /* pass nid through */
2179         current->user->nid = oti->oti_nid;
2180
2181         /* make sure that object is allocated. */
2182         dentry = filter_crow_object(exp->exp_obd, oa);
2183         if (IS_ERR(dentry))
2184                 GOTO(out_pop, rc = PTR_ERR(dentry));
2185
2186         rc = filter_verify_fid(exp, dentry->d_inode, capa);
2187         if (rc)
2188                 GOTO(out_pop, rc);
2189
2190         lock_kernel();
2191
2192         /* setting objects attributes (including owner/group) */
2193         rc = filter_setattr_internal(exp, dentry, oa, oti);
2194         if (rc)
2195                 GOTO(out_unlock, rc);
2196
2197         res = ldlm_resource_get(exp->exp_obd->obd_namespace, NULL,
2198                                 res_id, LDLM_EXTENT, 0);
2199
2200         if (res != NULL) {
2201                 ns_lvbo = res->lr_namespace->ns_lvbo;
2202                 if (ns_lvbo && ns_lvbo->lvbo_update)
2203                         rc = ns_lvbo->lvbo_update(res, NULL, 0, 0);
2204                 ldlm_resource_putref(res);
2205         }
2206
2207         oa->o_valid = OBD_MD_FLID;
2208         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2209
2210         EXIT;
2211 out_unlock:
2212         unlock_kernel();
2213         f_dput(dentry);
2214 out_pop:
2215         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2216         return rc;
2217 }
2218
2219 /* XXX identical to osc_unpackmd */
2220 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2221                            struct lov_mds_md *lmm, int lmm_bytes)
2222 {
2223         int lsm_size;
2224         ENTRY;
2225
2226         if (lmm != NULL) {
2227                 if (lmm_bytes < sizeof (*lmm)) {
2228                         CERROR("lov_mds_md too small: %d, need %d\n",
2229                                lmm_bytes, (int)sizeof(*lmm));
2230                         RETURN(-EINVAL);
2231                 }
2232                 /* XXX LOV_MAGIC etc check? */
2233
2234                 if (lmm->lmm_object_id == cpu_to_le64(0)) {
2235                         CERROR("lov_mds_md: zero lmm_object_id\n");
2236                         RETURN(-EINVAL);
2237                 }
2238         }
2239
2240         lsm_size = lov_stripe_md_size(1);
2241         if (lsmp == NULL)
2242                 RETURN(lsm_size);
2243
2244         if (*lsmp != NULL && lmm == NULL) {
2245                 OBD_FREE(*lsmp, lsm_size);
2246                 *lsmp = NULL;
2247                 RETURN(0);
2248         }
2249
2250         if (*lsmp == NULL) {
2251                 OBD_ALLOC(*lsmp, lsm_size);
2252                 if (*lsmp == NULL)
2253                         RETURN(-ENOMEM);
2254
2255                 loi_init((*lsmp)->lsm_oinfo);
2256         }
2257
2258         if (lmm != NULL) {
2259                 /* XXX zero *lsmp? */
2260                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
2261                 LASSERT((*lsmp)->lsm_object_id);
2262         }
2263
2264         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
2265
2266         RETURN(lsm_size);
2267 }
2268
2269 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
2270                          unsigned long max_age)
2271 {
2272         struct filter_obd *filter = &obd->u.filter;
2273         int blockbits = filter->fo_sb->s_blocksize_bits;
2274         int rc;
2275         ENTRY;
2276
2277         /* at least try to account for cached pages.  its still racey and
2278          * might be under-reporting if clients haven't announced their
2279          * caches with brw recently */
2280         spin_lock(&obd->obd_osfs_lock);
2281         rc = fsfilt_statfs(obd, filter->fo_sb, max_age);
2282         memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
2283         spin_unlock(&obd->obd_osfs_lock);
2284
2285         CDEBUG(D_SUPER | D_CACHE, "blocks cached "LPU64" granted "LPU64
2286                " pending "LPU64" free "LPU64" avail "LPU64"\n",
2287                filter->fo_tot_dirty, filter->fo_tot_granted,
2288                filter->fo_tot_pending,
2289                osfs->os_bfree << blockbits, osfs->os_bavail << blockbits);
2290
2291         filter_grant_sanity_check(obd, __FUNCTION__);
2292
2293         osfs->os_bavail -= min(osfs->os_bavail,
2294                                (filter->fo_tot_dirty + filter->fo_tot_pending +
2295                                 osfs->os_bsize -1) >> blockbits);
2296
2297         RETURN(rc);
2298 }
2299
2300 int filter_create_object(struct obd_device *obd, struct obdo *oa)
2301 {
2302         struct dentry *dparent = NULL;
2303         struct dentry *dchild = NULL;
2304         struct lvfs_ucred uc = {0,};
2305         struct lvfs_run_ctxt saved;
2306         struct filter_obd *filter;
2307         int cleanup_phase = 0;
2308         int err = 0, rc = 0;
2309         void *handle = NULL;
2310         void *lock = NULL;
2311         obd_uid uid;
2312         obd_gid gid;
2313         ENTRY;
2314
2315         filter = &obd->u.filter;
2316
2317         down(&filter->fo_create_locks[oa->o_gr]);
2318
2319         if (test_bit(oa->o_gr, &filter->fo_destroys_in_progress)) {
2320                 CWARN("%s: create aborted by destroy\n",
2321                       obd->obd_name);
2322                 GOTO(out, rc = -EALREADY);
2323         }
2324
2325         CDEBUG(D_INFO, "create objid "LPU64"\n", oa->o_id);
2326
2327         dparent = filter_parent_lock(obd, oa->o_gr, oa->o_id, &lock);
2328         if (IS_ERR(dparent))
2329                 GOTO(cleanup, rc = PTR_ERR(dparent));
2330         cleanup_phase = 1;
2331
2332         dchild = filter_id2dentry(obd, dparent, oa->o_gr, oa->o_id);
2333         if (IS_ERR(dchild))
2334                 GOTO(cleanup, rc = PTR_ERR(dchild));
2335         cleanup_phase = 2;
2336
2337         if (dchild->d_inode != NULL)
2338                 GOTO(cleanup, rc = 0);
2339
2340         handle = fsfilt_start_log(obd, dparent->d_inode,
2341                                   FSFILT_OP_CREATE, NULL, 1);
2342         if (IS_ERR(handle))
2343                 GOTO(cleanup, rc = PTR_ERR(handle));
2344         cleanup_phase = 3;
2345
2346         uid = oa->o_valid & OBD_MD_FLUID ? oa->o_uid : 0;
2347         gid = oa->o_valid & OBD_MD_FLGID ? oa->o_gid : 0;
2348
2349         uc.luc_uid = uid;
2350         uc.luc_gid = gid;
2351         uc.luc_fsuid = uid;
2352         uc.luc_fsgid = gid;
2353         uc.luc_cap = current->cap_effective;
2354         cap_raise(uc.luc_cap, CAP_SYS_RESOURCE);
2355
2356         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
2357         rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
2358         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
2359
2360         if (rc) {
2361                 CERROR("create failed rc = %d\n", rc);
2362                 GOTO(cleanup, rc);
2363         }
2364
2365         /* nobody else is touching this newly created object */
2366         LASSERT(dchild->d_inode);
2367         if (oa->o_valid & OBD_MD_FLIFID) {
2368                 rc = fsfilt_set_md(obd, dchild->d_inode, handle, obdo_id(oa),
2369                                    sizeof(struct lustre_id), EA_SID);
2370                 if (rc) {
2371                         CERROR("store fid in object failed! rc:%d\n", rc);
2372                         GOTO(cleanup, rc);
2373                 }
2374         } else {
2375                 CWARN("create object without lustre id!\n");
2376                 portals_debug_dumpstack(NULL);
2377         }
2378
2379         fsfilt_set_fs_flags(obd, dparent->d_inode, SM_DO_REC);
2380
2381         /* save last created object id */
2382         filter_save_last_id(filter, oa->o_gr, oa->o_id);
2383
2384         rc = filter_update_last_objid(obd, oa->o_gr, 0);
2385         if (rc) {
2386                 CERROR("unable to write lastobjid, but "
2387                        "orphans were deleted, err = %d\n",
2388                        rc);
2389                 rc = 0;
2390         }
2391 cleanup:
2392         switch(cleanup_phase) {
2393         case 3:
2394                 err = fsfilt_commit(obd, filter->fo_sb,
2395                                     dparent->d_inode, handle, 0);
2396                 if (err) {
2397                         CERROR("error on commit, err = %d\n", err);
2398                         if (!rc)
2399                                 rc = err;
2400                 }
2401         case 2:
2402                 f_dput(dchild);
2403         case 1:
2404                 filter_parent_unlock(dparent, lock);
2405         case 0:
2406                 break;
2407         }
2408
2409         if (rc)
2410                 GOTO(out, rc);
2411
2412 out:
2413         up(&filter->fo_create_locks[oa->o_gr]);
2414         RETURN(rc);
2415 }
2416
2417 struct dentry *
2418 filter_crow_object(struct obd_device *obd, struct obdo *oa)
2419 {
2420         struct dentry *dentry;
2421         /* obd_uid uid; */
2422         /* obd_gid gid; */
2423         int rc = 0;
2424         ENTRY;
2425
2426         /* check if object is already allocated */
2427         dentry = filter_id2dentry(obd, NULL, oa->o_gr, oa->o_id);
2428         if (IS_ERR(dentry))
2429                 RETURN(dentry);
2430
2431         if (dentry->d_inode)
2432                 RETURN(dentry);
2433
2434         f_dput(dentry);
2435         CDEBUG(D_INODE, "OSS object "LPU64"/"LPU64
2436                " does not exists - allocate it now\n",
2437                oa->o_id, oa->o_gr);
2438         /*
2439         uid = oa->o_valid & OBD_MD_FLUID ? oa->o_uid : 0;
2440         gid = oa->o_valid & OBD_MD_FLGID ? oa->o_gid : 0;
2441         */
2442         rc = filter_create_object(obd, oa);
2443         if (rc) {
2444                 CERROR("cannot create OSS object "LPU64"/"LPU64
2445                        ", err = %d\n", oa->o_id, oa->o_gr, rc);
2446                 RETURN(ERR_PTR(rc));
2447         }
2448
2449         /* lookup for just created object and return it to caller */
2450         dentry = filter_id2dentry(obd, NULL, oa->o_gr, oa->o_id);
2451         if (IS_ERR(dentry))
2452                 RETURN(dentry);
2453
2454         if (dentry->d_inode == NULL) {
2455                 f_dput(dentry);
2456                 dentry = ERR_PTR(-ENOENT);
2457                 CERROR("cannot find just created OSS object "
2458                        LPU64"/"LPU64" err = %d\n", oa->o_id,
2459                        oa->o_gr, (int)PTR_ERR(dentry));
2460                 RETURN(dentry);
2461         }
2462         RETURN(dentry);
2463 }
2464
2465 static int
2466 filter_clear_orphans(struct obd_export *exp, struct obdo *oa)
2467 {
2468         struct obd_device *obd = NULL;
2469         struct filter_obd *filter;
2470         struct obdo *doa = NULL;
2471         int rc = 0, orphans;
2472         __u64 last, id;
2473         ENTRY;
2474
2475         LASSERT(oa);
2476         LASSERT(oa->o_gr != 0);
2477         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2478
2479         obd = exp->exp_obd;
2480         filter = &obd->u.filter;
2481
2482         last = filter_last_id(filter, oa->o_gr);
2483         orphans = last - oa->o_id;
2484
2485         if (orphans <= 0)
2486                 RETURN(0);
2487
2488         doa = obdo_alloc();
2489         if (doa == NULL)
2490                 RETURN(-ENOMEM);
2491
2492         doa->o_gr = oa->o_gr;
2493         doa->o_mode = S_IFREG;
2494         doa->o_valid = oa->o_valid & (OBD_MD_FLGROUP | OBD_MD_FLID);
2495
2496         set_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2497         down(&filter->fo_create_locks[doa->o_gr]);
2498         if (!test_bit(doa->o_gr, &filter->fo_destroys_in_progress)) {
2499                 CERROR("%s:["LPU64"] destroy_in_progress already cleared\n",
2500                        exp->exp_obd->obd_name, doa->o_gr);
2501                 up(&filter->fo_create_locks[doa->o_gr]);
2502                 GOTO(out_free_doa, 0);
2503         }
2504
2505         CDEBUG(D_ERROR, "%s:["LPU64"] deleting orphan objects from "LPU64" to "
2506               LPU64"\n", exp->exp_obd->obd_name, doa->o_gr,
2507               oa->o_id + 1, last);
2508
2509         for (id = oa->o_id + 1; id <= last; id++) {
2510                 doa->o_id = id;
2511                 filter_destroy(exp, doa, NULL, NULL);
2512         }
2513
2514         CDEBUG(D_ERROR, "%s:["LPU64"] after destroy: set last_objids = "
2515                LPU64"\n", exp->exp_obd->obd_name, doa->o_gr, last + 1);
2516
2517         /* return next free id to be used as a new start of sequence -bzzz */
2518         oa->o_id = last + 1;
2519
2520         filter_set_last_id(filter, oa->o_gr, oa->o_id);
2521         clear_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2522         up(&filter->fo_create_locks[oa->o_gr]);
2523
2524         EXIT;
2525 out_free_doa:
2526         obdo_free(doa);
2527         return rc;
2528 }
2529
2530 /*
2531  * by now this function is only needed as entry point for deleting orphanes on
2532  * OSS as objects are created on first write attempt. --umka
2533  */
2534 static int
2535 filter_create(struct obd_export *exp, struct obdo *oa, void *acl,
2536               int acl_size, struct lov_stripe_md **ea,
2537               struct obd_trans_info *oti)
2538 {
2539         struct filter_export_data *fed;
2540         struct obd_device *obd = NULL;
2541         int group = oa->o_gr, rc = 0;
2542         struct lvfs_run_ctxt saved;
2543         struct filter_obd *filter;
2544         char str[PTL_NALFMT_SIZE];
2545         ENTRY;
2546
2547         LASSERT(acl == NULL && acl_size == 0);
2548
2549         if (!(oa->o_valid & OBD_MD_FLGROUP) || group == 0) {
2550                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2551                                 exp->exp_connection->c_peer.peer_id.nid, str);
2552                 CERROR("!!! nid "LPX64"/%s sent invalid object group %d\n",
2553                        exp->exp_connection->c_peer.peer_id.nid, str, group);
2554                 RETURN(-EINVAL);
2555         }
2556
2557         obd = exp->exp_obd;
2558         fed = &exp->exp_filter_data;
2559         filter = &obd->u.filter;
2560
2561         if (fed->fed_group != group) {
2562                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2563                                 exp->exp_connection->c_peer.peer_id.nid, str);
2564                 CERROR("!!! this export (nid "LPX64"/%s) used object group %d "
2565                        "earlier; now it's trying to use group %d!  This could "
2566                        "be a bug in the MDS.  Tell CFS.\n",
2567                        exp->exp_connection->c_peer.peer_id.nid, str,
2568                        fed->fed_group, group);
2569                 RETURN(-ENOTUNIQ);
2570         }
2571
2572         CDEBUG(D_INFO, "filter_create(od->o_gr=%d,od->o_id="LPU64")\n",
2573                group, oa->o_id);
2574         if (oa->o_gr == FILTER_GROUP_ECHO) {
2575                 rc = filter_create_object(obd, oa);
2576                 if (rc == 0 && ea != NULL) {
2577                         struct lov_stripe_md *lsm = *ea;
2578                         if (lsm == NULL) {
2579                                 rc = obd_alloc_memmd(exp, &lsm);
2580                                 LASSERT(rc >= 0);
2581                         }
2582                         lsm->lsm_object_id = oa->o_id;
2583                         *ea = lsm;
2584                         rc = 0;
2585                 }
2586
2587                 RETURN(rc);
2588         }
2589
2590         obd = exp->exp_obd;
2591         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2592
2593         LASSERT((oa->o_valid & OBD_MD_FLFLAGS) &&
2594                 (oa->o_flags == OBD_FL_DELORPHAN));
2595
2596         rc = filter_clear_orphans(exp, oa);
2597         if (rc) {
2598                 CERROR("cannot clear orphanes starting from "
2599                        LPU64", err = %d\n", oa->o_id, rc);
2600         } else {
2601                 rc = filter_update_last_objid(obd, group, 0);
2602                 if (rc) {
2603                         CERROR("unable to write lastobjid, but "
2604                                "orphans were deleted, err = %d\n",
2605                                rc);
2606                 }
2607         }
2608         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2609
2610         RETURN(0);
2611 }
2612
2613 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
2614                           struct lov_stripe_md *ea, struct obd_trans_info *oti)
2615 {
2616         int rc, rc2, cleanup_phase = 0, have_prepared = 0;
2617         struct dentry *dchild = NULL, *dparent = NULL;
2618         struct llog_cookie *fcc = NULL;
2619         struct lvfs_run_ctxt saved;
2620         struct filter_obd *filter;
2621         struct obd_device *obd;
2622         void *handle = NULL;
2623         void *lock = NULL;
2624         struct iattr iattr;
2625         ENTRY;
2626
2627         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2628
2629         obd = exp->exp_obd;
2630         filter = &obd->u.filter;
2631
2632         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2633
2634  acquire_locks:
2635         dparent = filter_parent_lock(obd, oa->o_gr, oa->o_id, &lock);
2636         if (IS_ERR(dparent))
2637                 GOTO(cleanup, rc = PTR_ERR(dparent));
2638         cleanup_phase = 1;
2639
2640         dchild = filter_id2dentry(obd, dparent, oa->o_gr, oa->o_id);
2641         if (IS_ERR(dchild))
2642                 GOTO(cleanup, rc = PTR_ERR(dchild));
2643         cleanup_phase = 2;
2644
2645         if (dchild->d_inode == NULL) {
2646                 CDEBUG(D_INODE, "destroying non-existent object "LPU64"\n",
2647                        oa->o_id);
2648                 if (have_prepared)
2649                         GOTO(cleanup, rc = -ENOENT);
2650         }
2651
2652         if (!have_prepared) {
2653                 /* If we're really going to destroy the object, get ready
2654                  * by getting the clients to discard their cached data.
2655                  *
2656                  * We have to drop the parent lock, because
2657                  * filter_prepare_destroy will acquire a PW on the object, and
2658                  * we don't want to deadlock with an incoming write to the
2659                  * object, which has the extent PW and then wants to get the
2660                  * parent dentry to do the lookup.
2661                  *
2662                  * We dput the child because it's not worth the extra
2663                  * complication of condition the above code to skip it on the
2664                  * second time through. */
2665                 f_dput(dchild);
2666                 filter_parent_unlock(dparent, lock);
2667
2668                 filter_prepare_destroy(obd, oa->o_id, oa->o_gr);
2669                 have_prepared = 1;
2670                 goto acquire_locks;
2671         }
2672
2673         /* Our MDC connection is established by the MDS to us */
2674         if (oa->o_valid & OBD_MD_FLCOOKIE) {
2675                 OBD_ALLOC(fcc, sizeof(*fcc));
2676                 if (fcc != NULL)
2677                         memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
2678         }
2679
2680         /* we're gonna truncate it first in order to avoid possible
2681          * deadlock:
2682          *      P1                      P2
2683          * open trasaction      open transaction
2684          * down(i_zombie)       down(i_zombie)
2685          *                      restart transaction
2686          * (see BUG 4180) -bzzz
2687          */
2688         down(&dchild->d_inode->i_sem);
2689         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_SETATTR,NULL,1);
2690         if (IS_ERR(handle)) {
2691                 up(&dchild->d_inode->i_sem);
2692                 GOTO(cleanup, rc = PTR_ERR(handle));
2693         }
2694
2695         iattr.ia_valid = ATTR_SIZE;
2696         iattr.ia_size = 0;
2697         rc = fsfilt_setattr(obd, dchild, handle, &iattr, 1);
2698
2699         rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode, handle, 0);
2700         up(&dchild->d_inode->i_sem);
2701         if (rc)
2702                 GOTO(cleanup, rc);
2703         if (rc2)
2704                 GOTO(cleanup, rc = rc2);
2705
2706         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_UNLINK,oti,1);
2707         if (IS_ERR(handle))
2708                 GOTO(cleanup, rc = PTR_ERR(handle));
2709
2710         cleanup_phase = 3;
2711
2712         rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
2713
2714 cleanup:
2715         switch(cleanup_phase) {
2716         case 3:
2717                 if (fcc != NULL) {
2718                         fsfilt_add_journal_cb(obd, filter->fo_sb, 0,
2719                                               oti ? oti->oti_handle : handle,
2720                                               filter_cancel_cookies_cb, fcc);
2721                 }
2722                 rc = filter_finish_transno(exp, oti, rc);
2723                 rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode,
2724                                     handle, exp->exp_sync);
2725                 if (rc2) {
2726                         CERROR("error on commit, err = %d\n", rc2);
2727                         if (!rc)
2728                                 rc = rc2;
2729                 }
2730         case 2:
2731                 f_dput(dchild);
2732         case 1:
2733                 filter_parent_unlock(dparent, lock);
2734         case 0:
2735                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2736                 break;
2737         default:
2738                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2739                 LBUG();
2740         }
2741
2742         RETURN(rc);
2743 }
2744
2745 /* NB start and end are used for punch, but not truncate */
2746 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
2747                            struct lov_stripe_md *lsm, obd_off start,
2748                            obd_off end, struct obd_trans_info *oti,
2749                            struct lustre_capa *capa)
2750 {
2751         int error;
2752         int rc;
2753         ENTRY;
2754
2755         if (end != OBD_OBJECT_EOF)
2756                 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
2757                        end);
2758
2759         rc = filter_verify_capa(OBD_BRW_WRITE, exp, capa);
2760         if (rc)
2761                 RETURN(rc);
2762
2763         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = "LPU64", "
2764                "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
2765
2766         oa->o_size = start;
2767         error = filter_setattr(exp, oa, NULL, oti, capa);
2768         RETURN(error);
2769 }
2770
2771 static int filter_sync(struct obd_export *exp, struct obdo *oa,
2772                        struct lov_stripe_md *lsm, obd_off start, obd_off end)
2773 {
2774         struct obd_device *obd = exp->exp_obd;
2775         struct lvfs_run_ctxt saved;
2776         struct filter_obd *filter;
2777         struct dentry *dentry;
2778         int rc, rc2;
2779         ENTRY;
2780
2781         filter = &obd->u.filter;
2782
2783         /* an objid of zero is taken to mean "sync whole filesystem" */
2784         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
2785                 rc = fsfilt_sync(obd, filter->fo_sb);
2786                 /* flush any remaining cancel messages out to the target */
2787                 filter_sync_llogs(obd, NULL);
2788                 RETURN(rc);
2789         }
2790
2791         dentry = filter_oa2dentry(obd, oa);
2792         if (IS_ERR(dentry))
2793                 RETURN(PTR_ERR(dentry));
2794
2795         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2796
2797         down(&dentry->d_inode->i_sem);
2798         rc = filemap_fdatawrite(dentry->d_inode->i_mapping);
2799         if (rc == 0) {
2800                 /* just any file to grab fsync method - "file" arg unused */
2801                 struct file *file = filter->fo_rcvd_filp;
2802
2803                 if (file->f_op && file->f_op->fsync)
2804                         rc = file->f_op->fsync(NULL, dentry, 1);
2805
2806                 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
2807                 if (!rc)
2808                         rc = rc2;
2809         }
2810         up(&dentry->d_inode->i_sem);
2811
2812         oa->o_valid = OBD_MD_FLID;
2813         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2814
2815         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2816
2817         f_dput(dentry);
2818         RETURN(rc);
2819 }
2820
2821 static int filter_set_info(struct obd_export *exp, __u32 keylen,
2822                            void *key, __u32 vallen, void *val)
2823 {
2824         struct obd_device *obd;
2825         int rc = -EINVAL;
2826         ENTRY;
2827
2828         obd = class_exp2obd(exp);
2829         if (obd == NULL) {
2830                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2831                        exp->exp_handle.h_cookie);
2832                 RETURN(-EINVAL);
2833         }
2834
2835         if (keylen == 8 && memcmp(key, "auditlog", 8) == 0) {
2836                 rc = fsfilt_set_info(obd, obd->u.filter.fo_sb, NULL,
2837                                      8, "auditlog", vallen, val);
2838                 RETURN(rc);
2839         } else if (keylen == 5 && strcmp(key, "audit") == 0) {
2840                 /* set audit for whole FS on OSS */
2841                 struct audit_attr_msg * msg = val;
2842
2843                 rc = fsfilt_set_info(obd, obd->u.filter.fo_sb, NULL,
2844                                      5, "audit", sizeof(msg->attr), &msg->attr);
2845                 RETURN(rc);
2846         } else if (keylen == 9 && strcmp(key, "audit_obj") == 0) {
2847                 struct obdo * oa = val;
2848                 struct dentry * dentry;
2849                 __u64 mask = oa->o_fid;
2850
2851                 dentry = filter_crow_object(obd, oa);
2852                 if (IS_ERR(dentry))
2853                         RETURN(PTR_ERR(dentry));
2854
2855                 rc = fsfilt_set_info(obd, obd->u.filter.fo_sb, dentry->d_inode,
2856                                      5, "audit", sizeof(mask), &mask);
2857
2858                 f_dput(dentry);
2859
2860                 RETURN(rc);
2861         } else if (keylen == 8 && memcmp(key, "capa_key", 8) == 0) {
2862                 struct lustre_capa_key *lkey = val;
2863                 rc = filter_update_capa_key(obd, lkey);
2864                 RETURN(rc);
2865         }
2866
2867         if (rc)
2868                 CDEBUG(D_IOCTL, "invalid key '%s'\n", (char *)key);
2869
2870         RETURN(rc);
2871 }
2872
2873 static int filter_get_info(struct obd_export *exp, __u32 keylen,
2874                            void *key, __u32 *vallen, void *val)
2875 {
2876         struct filter_export_data *fed = &exp->exp_filter_data;
2877         struct obd_device *obd;
2878         ENTRY;
2879
2880         obd = class_exp2obd(exp);
2881         if (obd == NULL) {
2882                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2883                        exp->exp_handle.h_cookie);
2884                 RETURN(-EINVAL);
2885         }
2886
2887         if (keylen == strlen("blocksize") &&
2888             memcmp(key, "blocksize", keylen) == 0) {
2889                 __u32 *blocksize = val;
2890                 *vallen = sizeof(*blocksize);
2891                 *blocksize = obd->u.filter.fo_sb->s_blocksize;
2892                 RETURN(0);
2893         }
2894
2895         if (keylen == strlen("blocksize_bits") &&
2896             memcmp(key, "blocksize_bits", keylen) == 0) {
2897                 __u32 *blocksize_bits = val;
2898                 *vallen = sizeof(*blocksize_bits);
2899                 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
2900                 RETURN(0);
2901         }
2902
2903         if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
2904                 obd_id *last_id = val;
2905                 *last_id = filter_last_id(&obd->u.filter, fed->fed_group);
2906                 RETURN(0);
2907         }
2908         if (keylen >= strlen("reint_log") && memcmp(key, "reint_log", 9) == 0) {
2909                 /*Get log_context handle*/
2910                 unsigned long *llh_handle = val;
2911                 *vallen = sizeof(unsigned long);
2912                 *llh_handle = (unsigned long)llog_get_context(&obd->obd_llogs,
2913                                                        LLOG_REINT_ORIG_CTXT);
2914                 RETURN(0);
2915         }
2916         if (keylen >= strlen("cache_sb") && memcmp(key, "cache_sb", 8) == 0) {
2917                 unsigned long *sb = val;
2918                 *vallen = sizeof(unsigned long);
2919                 *sb = (unsigned long)obd->u.filter.fo_sb;
2920                 RETURN(0);
2921         }
2922
2923         CDEBUG(D_IOCTL, "invalid key\n");
2924         RETURN(-EINVAL);
2925 }
2926
2927 struct obd_llogs *filter_grab_llog_for_group(struct obd_device *obd, int group,
2928                                              struct obd_export *export)
2929 {
2930         struct filter_group_llog *fglog, *nlog;
2931         char name[32] = "CATLIST";
2932         struct filter_obd *filter;
2933         struct llog_ctxt *ctxt;
2934         struct list_head *cur;
2935         int rc;
2936
2937         filter = &obd->u.filter;
2938
2939         spin_lock(&filter->fo_llog_list_lock);
2940         list_for_each(cur, &filter->fo_llog_list) {
2941                 fglog = list_entry(cur, struct filter_group_llog, list);
2942                 if (fglog->group == group) {
2943                         if (!(fglog->exp == NULL || fglog->exp == export || export == NULL))
2944                                 CWARN("%s: export for group %d changes: 0x%p -> 0x%p\n",
2945                                       obd->obd_name, group, fglog->exp, export);
2946                         spin_unlock(&filter->fo_llog_list_lock);
2947                         goto init;
2948                 }
2949         }
2950         spin_unlock(&filter->fo_llog_list_lock);
2951
2952         if (export == NULL)
2953                 RETURN(NULL);
2954
2955         OBD_ALLOC(fglog, sizeof(*fglog));
2956         if (fglog == NULL)
2957                 RETURN(NULL);
2958         fglog->group = group;
2959
2960         OBD_ALLOC(fglog->llogs, sizeof(struct obd_llogs));
2961         if (fglog->llogs == NULL) {
2962                 OBD_FREE(fglog, sizeof(*fglog));
2963                 RETURN(NULL);
2964         }
2965
2966         spin_lock(&filter->fo_llog_list_lock);
2967         list_for_each(cur, &filter->fo_llog_list) {
2968                 nlog = list_entry(cur, struct filter_group_llog, list);
2969                 LASSERT(nlog->group != group);
2970         }
2971         list_add(&fglog->list, &filter->fo_llog_list);
2972         spin_unlock(&filter->fo_llog_list_lock);
2973
2974         rc = obd_llog_cat_initialize(obd, fglog->llogs, 1, name);
2975         if (rc) {
2976                 OBD_FREE(fglog->llogs, sizeof(*(fglog->llogs)));
2977                 OBD_FREE(fglog, sizeof(*fglog));
2978                 RETURN(NULL);
2979         }
2980
2981 init:
2982         if (export) {
2983                 fglog->exp = export;
2984                 ctxt = llog_get_context(fglog->llogs, LLOG_UNLINK_REPL_CTXT);
2985                 LASSERT(ctxt != NULL);
2986
2987                 llog_receptor_accept(ctxt, export->exp_imp_reverse);
2988         }
2989         CDEBUG(D_OTHER, "%s: new llog 0x%p for group %u\n",
2990                obd->obd_name, fglog->llogs, group);
2991
2992         RETURN(fglog->llogs);
2993 }
2994
2995 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
2996                      int len, void *karg, void *uarg)
2997 {
2998         struct obd_device *obd = exp->exp_obd;
2999         struct obd_ioctl_data *data = karg;
3000         int rc = 0;
3001
3002         switch (cmd) {
3003         case OBD_IOC_ABORT_RECOVERY:
3004                 target_stop_recovery_thread(obd);
3005                 RETURN(0);
3006
3007         case OBD_IOC_SET_READONLY: {
3008                 void *handle;
3009                 struct super_block *sb = obd->u.filter.fo_sb;
3010                 struct inode *inode = sb->s_root->d_inode;
3011                 BDEVNAME_DECLARE_STORAGE(tmp);
3012                 CERROR("setting device %s read-only\n",
3013                        ll_bdevname(sb, tmp));
3014
3015                 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
3016                 LASSERT(handle);
3017                 (void)fsfilt_commit(obd, sb, inode, handle, 1);
3018
3019                 ll_set_rdonly(ll_sbdev(obd->u.filter.fo_sb));
3020                 RETURN(0);
3021         }
3022
3023         case OBD_IOC_CATLOGLIST: {
3024                 rc = llog_catalog_list(obd, 1, data);
3025                 RETURN(rc);
3026         }
3027         case OBD_IOC_LLOG_CANCEL:
3028         case OBD_IOC_LLOG_REMOVE:
3029         case OBD_IOC_LLOG_INFO:
3030         case OBD_IOC_LLOG_PRINT: {
3031                 /* FIXME to be finished */
3032                 RETURN(-EOPNOTSUPP);
3033 /*
3034                 struct llog_ctxt *ctxt = NULL;
3035
3036                 push_ctxt(&saved, &ctxt->loc_ctxt, NULL);
3037                 rc = llog_ioctl(ctxt, cmd, data);
3038                 pop_ctxt(&saved, &ctxt->loc_ctxt, NULL);
3039
3040                 RETURN(rc);
3041 */
3042         }
3043
3044
3045         default:
3046                 RETURN(-EINVAL);
3047         }
3048         RETURN(0);
3049 }
3050
3051 static struct llog_operations filter_unlink_repl_logops;
3052 static struct llog_operations filter_size_orig_logops = {
3053         lop_setup: llog_obd_origin_setup,
3054         lop_cleanup: llog_catalog_cleanup,
3055         lop_add: llog_catalog_add,
3056 };
3057
3058 static int filter_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
3059                             struct obd_device *tgt, int count,
3060                             struct llog_catid *catid)
3061 {
3062         struct llog_ctxt *ctxt;
3063         int rc;
3064         ENTRY;
3065
3066         filter_unlink_repl_logops = llog_client_ops;
3067         filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
3068         filter_unlink_repl_logops.lop_connect = llog_repl_connect;
3069         filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
3070
3071         rc = obd_llog_setup(obd, llogs, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
3072                         &filter_unlink_repl_logops);
3073         if (rc)
3074                 RETURN(rc);
3075         /* FIXME - assign unlink_cb for filter's recovery */
3076         ctxt = llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT);
3077         ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
3078
3079         filter_size_orig_logops = llog_lvfs_ops;
3080 #if 0
3081         filter_size_orig_logops.lop_setup = llog_obd_origin_setup;
3082         filter_size_orig_logops.lop_cleanup = llog_catalog_cleanup;
3083         filter_size_orig_logops.lop_add = llog_catalog_add;
3084 #endif
3085         rc = obd_llog_setup(obd, llogs, LLOG_SIZE_ORIG_CTXT, tgt, 1,
3086                             &catid->lci_logid, &filter_size_orig_logops);
3087         RETURN(rc);
3088 }
3089
3090 static int filter_llog_finish(struct obd_device *obd,
3091                               struct obd_llogs *llogs, int count)
3092 {
3093         int rc;
3094         ENTRY;
3095
3096         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT));
3097         if (rc)
3098                 RETURN(rc);
3099
3100         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_SIZE_ORIG_CTXT));
3101         RETURN(rc);
3102 }
3103
3104 static int filter_llog_connect(struct obd_export *exp,
3105                                struct llogd_conn_body *body)
3106 {
3107         struct obd_device *obd = exp->exp_obd;
3108         struct llog_ctxt *ctxt;
3109         struct obd_llogs *llog;
3110         int rc;
3111         ENTRY;
3112
3113         CDEBUG(D_OTHER, "handle connect for %s: %u/%u/%u\n", obd->obd_name,
3114                (unsigned) body->lgdc_logid.lgl_ogr,
3115                (unsigned) body->lgdc_logid.lgl_oid,
3116                (unsigned) body->lgdc_logid.lgl_ogen);
3117         llog = filter_grab_llog_for_group(obd, body->lgdc_logid.lgl_ogr, exp);
3118         LASSERT(llog != NULL);
3119         ctxt = llog_get_context(llog, body->lgdc_ctxt_idx);
3120         rc = llog_connect(ctxt, 1, &body->lgdc_logid,
3121                           &body->lgdc_gen, NULL);
3122         if (rc != 0)
3123                 CERROR("failed to connect\n");
3124
3125         RETURN(rc);
3126 }
3127
3128 static struct dentry *filter_lvfs_id2dentry(__u64 id, __u32 gen,
3129                                             __u64 gr, void *data)
3130 {
3131         return filter_id2dentry(data, NULL, gr, id);
3132 }
3133
3134 static struct lvfs_callback_ops filter_lvfs_ops = {
3135         l_id2dentry:     filter_lvfs_id2dentry,
3136 };
3137
3138 static struct obd_ops filter_obd_ops = {
3139         .o_owner          = THIS_MODULE,
3140         .o_attach         = filter_attach,
3141         .o_detach         = filter_detach,
3142         .o_set_info       = filter_set_info,
3143         .o_get_info       = filter_get_info,
3144         .o_setup          = filter_setup,
3145         .o_precleanup     = filter_precleanup,
3146         .o_cleanup        = filter_cleanup,
3147         .o_process_config = filter_process_config,
3148         .o_connect        = filter_connect,
3149         .o_connect_post   = filter_connect_post,
3150         .o_disconnect     = filter_disconnect,
3151         .o_statfs         = filter_statfs,
3152         .o_getattr        = filter_getattr,
3153         .o_unpackmd       = filter_unpackmd,
3154         .o_create         = filter_create,
3155         .o_setattr        = filter_setattr,
3156         .o_destroy        = filter_destroy,
3157         .o_brw            = filter_brw,
3158         .o_punch          = filter_truncate,
3159         .o_sync           = filter_sync,
3160         .o_preprw         = filter_preprw,
3161         .o_commitrw       = filter_commitrw,
3162         .o_do_cow         = filter_do_cow,
3163         .o_write_extents  = filter_write_extents,
3164         .o_destroy_export = filter_destroy_export,
3165         .o_llog_init      = filter_llog_init,
3166         .o_llog_finish    = filter_llog_finish,
3167         .o_llog_connect   = filter_llog_connect,
3168         .o_iocontrol      = filter_iocontrol,
3169 };
3170
3171 static struct obd_ops filter_sanobd_ops = {
3172         .o_owner          = THIS_MODULE,
3173         .o_attach         = filter_attach,
3174         .o_detach         = filter_detach,
3175         .o_get_info       = filter_get_info,
3176         .o_setup          = filter_san_setup,
3177         .o_precleanup     = filter_precleanup,
3178         .o_cleanup        = filter_cleanup,
3179         .o_connect        = filter_connect,
3180         .o_connect_post   = filter_connect_post,
3181         .o_disconnect     = filter_disconnect,
3182         .o_statfs         = filter_statfs,
3183         .o_getattr        = filter_getattr,
3184         .o_unpackmd       = filter_unpackmd,
3185         .o_create         = filter_create,
3186         .o_setattr        = filter_setattr,
3187         .o_destroy        = filter_destroy,
3188         .o_brw            = filter_brw,
3189         .o_punch          = filter_truncate,
3190         .o_sync           = filter_sync,
3191         .o_preprw         = filter_preprw,
3192         .o_commitrw       = filter_commitrw,
3193         .o_do_cow         = filter_do_cow,
3194         .o_write_extents  = filter_write_extents,
3195         .o_san_preprw     = filter_san_preprw,
3196         .o_destroy_export = filter_destroy_export,
3197         .o_llog_init      = filter_llog_init,
3198         .o_llog_finish    = filter_llog_finish,
3199         .o_llog_connect   = filter_llog_connect,
3200         .o_iocontrol      = filter_iocontrol,
3201 };
3202
3203 static int __init obdfilter_init(void)
3204 {
3205         struct lprocfs_static_vars lvars;
3206         int size, rc;
3207
3208         printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
3209
3210         lprocfs_init_vars(filter, &lvars);
3211
3212         size = OBDFILTER_CREATED_SCRATCHPAD_ENTRIES *
3213                 sizeof(*obdfilter_created_scratchpad);
3214
3215         OBD_ALLOC(obdfilter_created_scratchpad, size);
3216         if (obdfilter_created_scratchpad == NULL) {
3217                 CERROR ("Can't allocate scratchpad\n");
3218                 return -ENOMEM;
3219         }
3220
3221         rc = class_register_type(&filter_obd_ops, NULL, lvars.module_vars,
3222                                  OBD_FILTER_DEVICENAME);
3223         if (rc) {
3224                 OBD_FREE(obdfilter_created_scratchpad, size);
3225                 return rc;
3226         }
3227
3228         rc = class_register_type(&filter_sanobd_ops, NULL, lvars.module_vars,
3229                                  OBD_FILTER_SAN_DEVICENAME);
3230         if (rc) {
3231                 class_unregister_type(OBD_FILTER_DEVICENAME);
3232                 OBD_FREE(obdfilter_created_scratchpad, size);
3233         }
3234         return rc;
3235 }
3236
3237 static void __exit obdfilter_exit(void)
3238 {
3239         class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
3240         class_unregister_type(OBD_FILTER_DEVICENAME);
3241         OBD_FREE(obdfilter_created_scratchpad,
3242                  OBDFILTER_CREATED_SCRATCHPAD_ENTRIES *
3243                  sizeof(*obdfilter_created_scratchpad));
3244 }
3245
3246 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
3247 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
3248 MODULE_LICENSE("GPL");
3249
3250 module_init(obdfilter_init);
3251 module_exit(obdfilter_exit);