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LU-1302 llog: pass lu_env as parametr in llog functions
[fs/lustre-release.git] / lustre / obdfilter / filter.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/obdfilter/filter.c
37  *
38  * Author: Peter Braam <braam@clusterfs.com>
39  * Author: Andreas Dilger <adilger@clusterfs.com>
40  */
41
42 /*
43  * Invariant: Get O/R i_mutex for lookup, if needed, before any journal ops
44  *            (which need to get journal_lock, may block if journal full).
45  *
46  * Invariant: Call filter_start_transno() before any journal ops to avoid the
47  *            same deadlock problem.  We can (and want) to get rid of the
48  *            transno sem in favour of the dir/inode i_mutex to avoid single
49  *            threaded operation on the OST.
50  */
51
52 #define DEBUG_SUBSYSTEM S_FILTER
53
54 #include <linux/module.h>
55 #include <linux/fs.h>
56 #include <linux/dcache.h>
57 #include <linux/init.h>
58 #include <linux/version.h>
59 #include <linux/sched.h>
60 #include <linux/mount.h>
61 #include <linux/buffer_head.h>
62
63 #include <obd_cksum.h>
64 #include <obd_class.h>
65 #include <obd_lov.h>
66 #include <lustre_dlm.h>
67 #include <lustre_fsfilt.h>
68 #include <lprocfs_status.h>
69 #include <lustre_log.h>
70 #include <libcfs/list.h>
71 #include <lustre_disk.h>
72 #include <lustre_quota.h>
73 #include <linux/slab.h>
74 #include <lustre_param.h>
75 #include <lustre/ll_fiemap.h>
76
77 #include "filter_internal.h"
78
79 static struct lvfs_callback_ops filter_lvfs_ops;
80 cfs_mem_cache_t *ll_fmd_cachep;
81
82 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
83                              void *cb_data, int error)
84 {
85         struct obd_export *exp = cb_data;
86         LASSERT(exp->exp_obd == obd);
87         obd_transno_commit_cb(obd, transno, exp, error);
88         class_export_cb_put(exp);
89 }
90
91 int filter_version_get_check(struct obd_export *exp,
92                              struct obd_trans_info *oti, struct inode *inode)
93 {
94         __u64 curr_version;
95
96         if (inode == NULL || oti == NULL)
97                 RETURN(0);
98
99         curr_version = fsfilt_get_version(exp->exp_obd, inode);
100         if ((__s64)curr_version == -EOPNOTSUPP)
101                 RETURN(0);
102         /* VBR: version is checked always because costs nothing */
103         if (oti->oti_pre_version != 0 &&
104             oti->oti_pre_version != curr_version) {
105                 CDEBUG(D_INODE, "Version mismatch "LPX64" != "LPX64"\n",
106                        oti->oti_pre_version, curr_version);
107                 cfs_spin_lock(&exp->exp_lock);
108                 exp->exp_vbr_failed = 1;
109                 cfs_spin_unlock(&exp->exp_lock);
110                 RETURN (-EOVERFLOW);
111         }
112         oti->oti_pre_version = curr_version;
113         RETURN(0);
114 }
115
116 /* Assumes caller has already pushed us into the kernel context. */
117 int filter_finish_transno(struct obd_export *exp, struct inode *inode,
118                           struct obd_trans_info *oti, int rc, int force_sync)
119 {
120         struct obd_device_target *obt = &exp->exp_obd->u.obt;
121         struct tg_export_data *ted = &exp->exp_target_data;
122         struct lr_server_data *lsd = class_server_data(exp->exp_obd);
123         struct lsd_client_data *lcd;
124         __u64 last_rcvd;
125         loff_t off;
126         int err, log_pri = D_RPCTRACE;
127
128         /* Propagate error code. */
129         if (rc)
130                 RETURN(rc);
131
132         if (!exp->exp_obd->obd_replayable || oti == NULL)
133                 RETURN(rc);
134
135         cfs_mutex_lock(&ted->ted_lcd_lock);
136         lcd = ted->ted_lcd;
137         /* if the export has already been disconnected, we have no last_rcvd slot,
138          * update server data with latest transno then */
139         if (lcd == NULL) {
140                 cfs_mutex_unlock(&ted->ted_lcd_lock);
141                 CWARN("commit transaction for disconnected client %s: rc %d\n",
142                       exp->exp_client_uuid.uuid, rc);
143                 err = filter_update_server_data(exp->exp_obd);
144                 RETURN(err);
145         }
146
147         /* we don't allocate new transnos for replayed requests */
148         cfs_spin_lock(&obt->obt_lut->lut_translock);
149         if (oti->oti_transno == 0) {
150                 last_rcvd = le64_to_cpu(lsd->lsd_last_transno) + 1;
151                 lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
152                 LASSERT(last_rcvd >= le64_to_cpu(lcd->lcd_last_transno));
153         } else {
154                 last_rcvd = oti->oti_transno;
155                 if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
156                         lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
157                 if (unlikely(last_rcvd < le64_to_cpu(lcd->lcd_last_transno))) {
158                         CERROR("Trying to overwrite bigger transno, on-disk: "
159                                LPU64", new: "LPU64"\n",
160                                le64_to_cpu(lcd->lcd_last_transno), last_rcvd);
161                         cfs_spin_lock(&exp->exp_lock);
162                         exp->exp_vbr_failed = 1;
163                         cfs_spin_unlock(&exp->exp_lock);
164                         cfs_spin_unlock(&obt->obt_lut->lut_translock);
165                         cfs_mutex_unlock(&ted->ted_lcd_lock);
166                         RETURN(-EOVERFLOW);
167                 }
168         }
169         oti->oti_transno = last_rcvd;
170
171         lcd->lcd_last_transno = cpu_to_le64(last_rcvd);
172         lcd->lcd_pre_versions[0] = cpu_to_le64(oti->oti_pre_version);
173         lcd->lcd_last_xid = cpu_to_le64(oti->oti_xid);
174         cfs_spin_unlock(&obt->obt_lut->lut_translock);
175
176         if (inode)
177                 fsfilt_set_version(exp->exp_obd, inode, last_rcvd);
178
179         off = ted->ted_lr_off;
180         if (off <= 0) {
181                 CERROR("%s: client idx %d is %lld\n", exp->exp_obd->obd_name,
182                        ted->ted_lr_idx, ted->ted_lr_off);
183                 err = -EINVAL;
184         } else {
185                 class_export_cb_get(exp); /* released when the cb is called */
186                 if (!force_sync)
187                         force_sync = fsfilt_add_journal_cb(exp->exp_obd,
188                                                            last_rcvd,
189                                                            oti->oti_handle,
190                                                            filter_commit_cb,
191                                                            exp);
192
193                 err = fsfilt_write_record(exp->exp_obd, obt->obt_rcvd_filp,
194                                           lcd, sizeof(*lcd), &off,
195                                           force_sync | exp->exp_need_sync);
196                 if (force_sync)
197                         filter_commit_cb(exp->exp_obd, last_rcvd, exp, err);
198         }
199         if (err) {
200                 log_pri = D_ERROR;
201                 if (rc == 0)
202                         rc = err;
203         }
204
205         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
206                last_rcvd, lcd->lcd_uuid, ted->ted_lr_idx, err);
207         cfs_mutex_unlock(&ted->ted_lcd_lock);
208         RETURN(rc);
209 }
210
211 void f_dput(struct dentry *dentry)
212 {
213         /* Can't go inside filter_ddelete because it can block */
214         CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
215                dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
216         LASSERT(atomic_read(&dentry->d_count) > 0);
217
218         dput(dentry);
219 }
220
221 static void init_brw_stats(struct brw_stats *brw_stats)
222 {
223         int i;
224         for (i = 0; i < BRW_LAST; i++)
225                 cfs_spin_lock_init(&brw_stats->hist[i].oh_lock);
226 }
227
228 static int lprocfs_init_rw_stats(struct obd_device *obd,
229                                  struct lprocfs_stats **stats)
230 {
231         int num_stats;
232
233         num_stats = (sizeof(*obd->obd_type->typ_dt_ops) / sizeof(void *)) +
234                                                         LPROC_FILTER_LAST - 1;
235         *stats = lprocfs_alloc_stats(num_stats, LPROCFS_STATS_FLAG_NOPERCPU);
236         if (*stats == NULL)
237                 return -ENOMEM;
238
239         lprocfs_init_ops_stats(LPROC_FILTER_LAST, *stats);
240         lprocfs_counter_init(*stats, LPROC_FILTER_READ_BYTES,
241                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
242         lprocfs_counter_init(*stats, LPROC_FILTER_WRITE_BYTES,
243                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
244
245         return(0);
246 }
247
248 /* brw_stats are 2128, ops are 3916, ldlm are 204, so 6248 bytes per client,
249    plus the procfs overhead :( */
250 static int filter_export_stats_init(struct obd_device *obd,
251                                     struct obd_export *exp,
252                                     void *client_nid)
253 {
254         int rc, newnid = 0;
255         ENTRY;
256
257         if (obd_uuid_equals(&exp->exp_client_uuid, &obd->obd_uuid))
258                 /* Self-export gets no proc entry */
259                 RETURN(0);
260
261         rc = lprocfs_exp_setup(exp, client_nid, &newnid);
262         if (rc) {
263                 /* Mask error for already created
264                  * /proc entries */
265                 if (rc == -EALREADY)
266                         rc = 0;
267                 RETURN(rc);
268         }
269
270         if (newnid) {
271                 struct nid_stat *tmp = exp->exp_nid_stats;
272                 LASSERT(tmp != NULL);
273
274                 OBD_ALLOC(tmp->nid_brw_stats, sizeof(struct brw_stats));
275                 if (tmp->nid_brw_stats == NULL)
276                         GOTO(clean, rc = -ENOMEM);
277
278                 init_brw_stats(tmp->nid_brw_stats);
279                 rc = lprocfs_seq_create(exp->exp_nid_stats->nid_proc, "brw_stats",
280                                         0644, &filter_per_nid_stats_fops,
281                                         exp->exp_nid_stats);
282                 if (rc)
283                         CWARN("Error adding the brw_stats file\n");
284
285                 rc = lprocfs_init_rw_stats(obd, &exp->exp_nid_stats->nid_stats);
286                 if (rc)
287                         GOTO(clean, rc);
288
289                 rc = lprocfs_register_stats(tmp->nid_proc, "stats",
290                                             tmp->nid_stats);
291                 if (rc)
292                         GOTO(clean, rc);
293                 rc = lprocfs_nid_ldlm_stats_init(tmp);
294                 if (rc)
295                         GOTO(clean, rc);
296         }
297
298         RETURN(0);
299  clean:
300         return rc;
301 }
302
303 /* Add client data to the FILTER.  We use a bitmap to locate a free space
304  * in the last_rcvd file if cl_idx is -1 (i.e. a new client).
305  * Otherwise, we have just read the data from the last_rcvd file and
306  * we know its offset. */
307 static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
308                              int cl_idx)
309 {
310         struct obd_device_target *obt = &obd->u.obt;
311         struct tg_export_data *ted = &exp->exp_target_data;
312         struct lr_server_data *lsd = class_server_data(obd);
313         unsigned long *bitmap = obt->obt_lut->lut_client_bitmap;
314         int new_client = (cl_idx == -1);
315
316         ENTRY;
317
318         LASSERT(bitmap != NULL);
319         LASSERTF(cl_idx > -2, "%d\n", cl_idx);
320
321         /* Self-export */
322         if (strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid) == 0)
323                 RETURN(0);
324
325         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
326          * there's no need for extra complication here
327          */
328         if (new_client) {
329                 cl_idx = cfs_find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
330         repeat:
331                 if (cl_idx >= LR_MAX_CLIENTS) {
332                         CERROR("no room for %u client - fix LR_MAX_CLIENTS\n",
333                                cl_idx);
334                         RETURN(-EOVERFLOW);
335                 }
336                 if (cfs_test_and_set_bit(cl_idx, bitmap)) {
337                         cl_idx = cfs_find_next_zero_bit(bitmap, LR_MAX_CLIENTS,
338                                                         cl_idx);
339                         goto repeat;
340                 }
341         } else {
342                 if (cfs_test_and_set_bit(cl_idx, bitmap)) {
343                         CERROR("FILTER client %d: bit already set in bitmap!\n",
344                                cl_idx);
345                         LBUG();
346                 }
347         }
348
349         ted->ted_lr_idx = cl_idx;
350         ted->ted_lr_off = le32_to_cpu(lsd->lsd_client_start) +
351                           cl_idx * le16_to_cpu(lsd->lsd_client_size);
352         cfs_mutex_init(&ted->ted_lcd_lock);
353         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
354
355         CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
356                ted->ted_lr_idx, ted->ted_lr_off, ted->ted_lcd->lcd_uuid);
357
358         if (new_client) {
359                 struct lvfs_run_ctxt saved;
360                 loff_t off = ted->ted_lr_off;
361                 int rc;
362                 void *handle;
363
364                 CDEBUG(D_INFO, "writing client lcd at idx %u (%llu) (len %u)\n",
365                        ted->ted_lr_idx,off,(unsigned int)sizeof(*ted->ted_lcd));
366
367                 if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
368                         RETURN(-ENOSPC);
369
370                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
371                 /* Transaction needed to fix bug 1403 */
372                 handle = fsfilt_start(obd,
373                                       obt->obt_rcvd_filp->f_dentry->d_inode,
374                                       FSFILT_OP_SETATTR, NULL);
375                 if (IS_ERR(handle)) {
376                         rc = PTR_ERR(handle);
377                         CERROR("unable to start transaction: rc %d\n", rc);
378                 } else {
379                         ted->ted_lcd->lcd_last_epoch = lsd->lsd_start_epoch;
380                         exp->exp_last_request_time = cfs_time_current_sec();
381                         rc = fsfilt_add_journal_cb(obd, 0, handle,
382                                                    target_client_add_cb,
383                                                    class_export_cb_get(exp));
384                         if (rc == 0) {
385                                 cfs_spin_lock(&exp->exp_lock);
386                                 exp->exp_need_sync = 1;
387                                 cfs_spin_unlock(&exp->exp_lock);
388                         }
389                         rc = fsfilt_write_record(obd, obt->obt_rcvd_filp,
390                                                  ted->ted_lcd,
391                                                  sizeof(*ted->ted_lcd),
392                                                  &off, rc /* sync if no cb */);
393                         fsfilt_commit(obd,
394                                       obt->obt_rcvd_filp->f_dentry->d_inode,
395                                       handle, 0);
396                 }
397                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
398
399                 if (rc) {
400                         CERROR("error writing %s client idx %u: rc %d\n",
401                                LAST_RCVD, ted->ted_lr_idx, rc);
402                         RETURN(rc);
403                 }
404         }
405         RETURN(0);
406 }
407
408 static int filter_client_del(struct obd_export *exp)
409 {
410         struct tg_export_data *ted = &exp->exp_target_data;
411         struct obd_device_target *obt = &exp->exp_obd->u.obt;
412         struct lvfs_run_ctxt saved;
413         int rc;
414         loff_t off;
415         ENTRY;
416
417         if (ted->ted_lcd == NULL)
418                 RETURN(0);
419
420         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
421         if (strcmp(ted->ted_lcd->lcd_uuid, exp->exp_obd->obd_uuid.uuid ) == 0)
422                 GOTO(free, 0);
423
424         LASSERT(obt->obt_lut->lut_client_bitmap != NULL);
425
426         off = ted->ted_lr_off;
427
428         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld with UUID '%s'\n",
429                ted->ted_lr_idx, ted->ted_lr_off, ted->ted_lcd->lcd_uuid);
430
431         /* Don't clear ted_lr_idx here as it is likely also unset.  At worst
432          * we leak a client slot that will be cleaned on the next recovery. */
433         if (off <= 0) {
434                 CERROR("%s: client idx %d has med_off %lld\n",
435                        exp->exp_obd->obd_name, ted->ted_lr_idx, off);
436                 GOTO(free, rc = -EINVAL);
437         }
438
439         /* Clear the bit _after_ zeroing out the client so we don't
440            race with filter_client_add and zero out new clients.*/
441         if (!cfs_test_bit(ted->ted_lr_idx, obt->obt_lut->lut_client_bitmap)) {
442                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
443                        ted->ted_lr_idx);
444                 LBUG();
445         }
446
447         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
448         /* Make sure the server's last_transno is up to date.
449          * This should be done before zeroing client slot so last_transno will
450          * be in server data or in client data in case of failure */
451         filter_update_server_data(exp->exp_obd);
452
453         cfs_mutex_lock(&ted->ted_lcd_lock);
454         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
455         rc = fsfilt_write_record(exp->exp_obd, obt->obt_rcvd_filp,
456                                  ted->ted_lcd,
457                                  sizeof(*ted->ted_lcd), &off, 0);
458         cfs_mutex_unlock(&ted->ted_lcd_lock);
459         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
460
461         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
462                "zero out client %s at idx %u/%llu in %s, rc %d\n",
463                ted->ted_lcd->lcd_uuid, ted->ted_lr_idx, ted->ted_lr_off,
464                LAST_RCVD, rc);
465         EXIT;
466 free:
467         return 0;
468 }
469
470 /* drop fmd reference, free it if last ref. must be called with fed_lock held.*/
471 static inline void filter_fmd_put_nolock(struct filter_export_data *fed,
472                                          struct filter_mod_data *fmd)
473 {
474         LASSERT_SPIN_LOCKED(&fed->fed_lock);
475         if (--fmd->fmd_refcount == 0) {
476                 /* XXX when we have persistent reservations and the handle
477                  * is stored herein we need to drop it here. */
478                 fed->fed_mod_count--;
479                 cfs_list_del(&fmd->fmd_list);
480                 OBD_SLAB_FREE(fmd, ll_fmd_cachep, sizeof(*fmd));
481         }
482 }
483
484 /* drop fmd reference, free it if last ref */
485 void filter_fmd_put(struct obd_export *exp, struct filter_mod_data *fmd)
486 {
487         struct filter_export_data *fed;
488
489         if (fmd == NULL)
490                 return;
491
492         fed = &exp->exp_filter_data;
493         cfs_spin_lock(&fed->fed_lock);
494         filter_fmd_put_nolock(fed, fmd); /* caller reference */
495         cfs_spin_unlock(&fed->fed_lock);
496 }
497
498 /* expire entries from the end of the list if there are too many
499  * or they are too old */
500 static void filter_fmd_expire_nolock(struct filter_obd *filter,
501                                      struct filter_export_data *fed,
502                                      struct filter_mod_data *keep)
503 {
504         struct filter_mod_data *fmd, *tmp;
505
506         cfs_list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
507                 if (fmd == keep)
508                         break;
509
510                 if (cfs_time_before(jiffies, fmd->fmd_expire) &&
511                     fed->fed_mod_count < filter->fo_fmd_max_num)
512                         break;
513
514                 cfs_list_del_init(&fmd->fmd_list);
515                 filter_fmd_put_nolock(fed, fmd); /* list reference */
516         }
517 }
518
519 void filter_fmd_expire(struct obd_export *exp)
520 {
521         cfs_spin_lock(&exp->exp_filter_data.fed_lock);
522         filter_fmd_expire_nolock(&exp->exp_obd->u.filter,
523                                  &exp->exp_filter_data, NULL);
524         cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
525 }
526
527 /* find specified objid, group in export fmd list.
528  * caller must hold fed_lock and take fmd reference itself */
529 static struct filter_mod_data *filter_fmd_find_nolock(struct filter_obd *filter,
530                                                 struct filter_export_data *fed,
531                                                 obd_id objid, obd_seq group)
532 {
533         struct filter_mod_data *found = NULL, *fmd;
534
535         LASSERT_SPIN_LOCKED(&fed->fed_lock);
536
537         cfs_list_for_each_entry_reverse(fmd, &fed->fed_mod_list, fmd_list) {
538                 if (fmd->fmd_id == objid && fmd->fmd_gr == group) {
539                         found = fmd;
540                         cfs_list_del(&fmd->fmd_list);
541                         cfs_list_add_tail(&fmd->fmd_list, &fed->fed_mod_list);
542                         fmd->fmd_expire = jiffies + filter->fo_fmd_max_age;
543                         break;
544                 }
545         }
546
547         filter_fmd_expire_nolock(filter, fed, found);
548
549         return found;
550 }
551
552 /* Find fmd based on objid and group, or return NULL if not found. */
553 struct filter_mod_data *filter_fmd_find(struct obd_export *exp,
554                                         obd_id objid, obd_seq group)
555 {
556         struct filter_mod_data *fmd;
557
558         cfs_spin_lock(&exp->exp_filter_data.fed_lock);
559         fmd = filter_fmd_find_nolock(&exp->exp_obd->u.filter,
560                                      &exp->exp_filter_data, objid, group);
561         if (fmd)
562                 fmd->fmd_refcount++;    /* caller reference */
563         cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
564
565         return fmd;
566 }
567
568 /* Find fmd based on objid and group, or create a new one if none is found.
569  * It is possible for this function to return NULL under memory pressure,
570  * or if objid = 0 is passed (which will only cause old entries to expire).
571  * Currently this is not fatal because any fmd state is transient and
572  * may also be freed when it gets sufficiently old. */
573 struct filter_mod_data *filter_fmd_get(struct obd_export *exp,
574                                        obd_id objid, obd_seq group)
575 {
576         struct filter_export_data *fed = &exp->exp_filter_data;
577         struct filter_mod_data *found = NULL, *fmd_new = NULL;
578
579         OBD_SLAB_ALLOC_PTR_GFP(fmd_new, ll_fmd_cachep, CFS_ALLOC_IO);
580
581         cfs_spin_lock(&fed->fed_lock);
582         found = filter_fmd_find_nolock(&exp->exp_obd->u.filter,fed,objid,group);
583         if (fmd_new) {
584                 if (found == NULL) {
585                         cfs_list_add_tail(&fmd_new->fmd_list,
586                                           &fed->fed_mod_list);
587                         fmd_new->fmd_id = objid;
588                         fmd_new->fmd_gr = group;
589                         fmd_new->fmd_refcount++;   /* list reference */
590                         found = fmd_new;
591                         fed->fed_mod_count++;
592                 } else {
593                         OBD_SLAB_FREE(fmd_new, ll_fmd_cachep, sizeof(*fmd_new));
594                 }
595         }
596         if (found) {
597                 found->fmd_refcount++;          /* caller reference */
598                 found->fmd_expire = jiffies +
599                         exp->exp_obd->u.filter.fo_fmd_max_age;
600         }
601
602         cfs_spin_unlock(&fed->fed_lock);
603
604         return found;
605 }
606
607 #ifdef DO_FMD_DROP
608 /* drop fmd list reference so it will disappear when last reference is put.
609  * This isn't so critical because it would in fact only affect the one client
610  * that is doing the unlink and at worst we have an stale entry referencing
611  * an object that should never be used again. */
612 static void filter_fmd_drop(struct obd_export *exp, obd_id objid, obd_seq group)
613 {
614         struct filter_mod_data *found = NULL;
615
616         cfs_spin_lock(&exp->exp_filter_data.fed_lock);
617         found = filter_fmd_find_nolock(&exp->exp_filter_data, objid, group);
618         if (found) {
619                 cfs_list_del_init(&found->fmd_list);
620                 filter_fmd_put_nolock(&exp->exp_filter_data, found);
621         }
622         cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
623 }
624 #else
625 #define filter_fmd_drop(exp, objid, group)
626 #endif
627
628 /* remove all entries from fmd list */
629 static void filter_fmd_cleanup(struct obd_export *exp)
630 {
631         struct filter_export_data *fed = &exp->exp_filter_data;
632         struct filter_mod_data *fmd = NULL, *tmp;
633
634         cfs_spin_lock(&fed->fed_lock);
635         cfs_list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
636                 cfs_list_del_init(&fmd->fmd_list);
637                 filter_fmd_put_nolock(fed, fmd);
638         }
639         cfs_spin_unlock(&fed->fed_lock);
640 }
641
642 static int filter_init_export(struct obd_export *exp)
643 {
644         int rc;
645         ENTRY;
646
647         cfs_spin_lock_init(&exp->exp_filter_data.fed_lock);
648         CFS_INIT_LIST_HEAD(&exp->exp_filter_data.fed_mod_list);
649
650         cfs_spin_lock(&exp->exp_lock);
651         exp->exp_connecting = 1;
652         cfs_spin_unlock(&exp->exp_lock);
653
654         /* self-export doesn't need client data and ldlm initialization */
655         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
656                                      &exp->exp_client_uuid)))
657                 RETURN(0);
658
659         rc = lut_client_alloc(exp);
660         if (rc == 0)
661                 rc = ldlm_init_export(exp);
662         if (rc)
663                 CERROR("%s: Can't initialize export: rc %d\n",
664                        exp->exp_obd->obd_name, rc);
665
666         RETURN(rc);
667 }
668
669 static int filter_free_server_data(struct obd_device_target *obt)
670 {
671         lut_fini(NULL, obt->obt_lut);
672         OBD_FREE_PTR(obt->obt_lut);
673         return 0;
674 }
675
676 /* assumes caller is already in kernel ctxt */
677 int filter_update_server_data(struct obd_device *obd)
678 {
679         struct file *filp = obd->u.obt.obt_rcvd_filp;
680         struct lr_server_data *lsd = class_server_data(obd);
681         loff_t off = 0;
682         int rc;
683         ENTRY;
684
685         CDEBUG(D_INODE, "server uuid      : %s\n", lsd->lsd_uuid);
686         CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
687                le64_to_cpu(lsd->lsd_last_transno));
688         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
689                le64_to_cpu(lsd->lsd_mount_count));
690
691         rc = fsfilt_write_record(obd, filp, lsd, sizeof(*lsd), &off, 0);
692         if (rc)
693                 CERROR("error writing lr_server_data: rc = %d\n", rc);
694
695         RETURN(rc);
696 }
697
698 int filter_update_last_objid(struct obd_device *obd, obd_seq group,
699                              int force_sync)
700 {
701         struct filter_obd *filter = &obd->u.filter;
702         __u64 tmp;
703         loff_t off = 0;
704         int rc;
705         ENTRY;
706
707         if (filter->fo_last_objid_files[group] == NULL) {
708                 CERROR("Object seq "LPU64" not fully setup; not updating "
709                        "last_objid\n", group);
710                 RETURN(-EINVAL);
711         }
712
713         CDEBUG(D_INODE, "%s: server last_objid for "POSTID"\n",
714                obd->obd_name, filter->fo_last_objids[group], group);
715
716         tmp = cpu_to_le64(filter->fo_last_objids[group]);
717         rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
718                                  &tmp, sizeof(tmp), &off, force_sync);
719         if (rc)
720                 CERROR("error writing seq "LPU64" last objid: rc = %d\n",
721                        group, rc);
722         RETURN(rc);
723 }
724 extern int ost_handle(struct ptlrpc_request *req);
725 /* assumes caller has already in kernel ctxt */
726 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
727 {
728         struct filter_obd *filter = &obd->u.filter;
729         struct lr_server_data *lsd;
730         struct lsd_client_data *lcd = NULL;
731         struct inode *inode = filp->f_dentry->d_inode;
732         unsigned long last_rcvd_size = i_size_read(inode);
733         struct lu_target *lut;
734         __u64 mount_count;
735         __u32 start_epoch;
736         int cl_idx;
737         loff_t off = 0;
738         int rc;
739
740         /* ensure padding in the struct is the correct size */
741         CLASSERT (offsetof(struct lr_server_data, lsd_padding) +
742                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
743         CLASSERT (offsetof(struct lsd_client_data, lcd_padding) +
744                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
745
746         /* allocate and initialize lu_target */
747         OBD_ALLOC_PTR(lut);
748         if (lut == NULL)
749                 RETURN(-ENOMEM);
750         rc = lut_init(NULL, lut, obd, NULL);
751         if (rc)
752                 GOTO(err_lut, rc);
753         lsd = class_server_data(obd);
754         if (last_rcvd_size == 0) {
755                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
756
757                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,sizeof(lsd->lsd_uuid));
758                 lsd->lsd_last_transno = 0;
759                 mount_count = lsd->lsd_mount_count = 0;
760                 lsd->lsd_server_size = cpu_to_le32(LR_SERVER_SIZE);
761                 lsd->lsd_client_start = cpu_to_le32(LR_CLIENT_START);
762                 lsd->lsd_client_size = cpu_to_le16(LR_CLIENT_SIZE);
763                 lsd->lsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
764                 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
765                 /* OBD_COMPAT_OST is set in filter_connect_internal when the
766                  * MDS first connects and assigns the OST index number. */
767                 lsd->lsd_feature_incompat = cpu_to_le32(OBD_INCOMPAT_COMMON_LR|
768                                                         OBD_INCOMPAT_OST);
769         } else {
770                 rc = fsfilt_read_record(obd, filp, lsd, sizeof(*lsd), &off);
771                 if (rc) {
772                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
773                                LAST_RCVD, rc);
774                         GOTO(err_lut, rc);
775                 }
776                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
777                         LCONSOLE_ERROR_MSG(0x134, "Trying to start OBD %s "
778                                            "using the wrong disk %s. Were the "
779                                            "/dev/ assignments rearranged?\n",
780                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
781                         GOTO(err_lut, rc = -EINVAL);
782                 }
783                 mount_count = le64_to_cpu(lsd->lsd_mount_count);
784                 filter->fo_subdir_count = le16_to_cpu(lsd->lsd_subdir_count);
785                 /* COMPAT_146 */
786                 /* Assume old last_rcvd format unless I_C_LR is set */
787                 if (!(lsd->lsd_feature_incompat &
788                       cpu_to_le32(OBD_INCOMPAT_COMMON_LR)))
789                         lsd->lsd_last_transno = lsd->lsd_compat14;
790                 /* end COMPAT_146 */
791                 /* OBD_COMPAT_OST is set in filter_connect_internal when the
792                  * MDS first connects and assigns the OST index number. */
793                 lsd->lsd_feature_incompat |= cpu_to_le32(OBD_INCOMPAT_COMMON_LR|
794                                                          OBD_INCOMPAT_OST);
795         }
796
797         if (lsd->lsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
798                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
799                        obd->obd_name, le32_to_cpu(lsd->lsd_feature_incompat) &
800                        ~FILTER_INCOMPAT_SUPP);
801                 GOTO(err_lut, rc = -EINVAL);
802         }
803         if (lsd->lsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
804                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
805                        obd->obd_name, le32_to_cpu(lsd->lsd_feature_rocompat) &
806                        ~FILTER_ROCOMPAT_SUPP);
807                 /* Do something like remount filesystem read-only */
808                 GOTO(err_lut, rc = -EINVAL);
809         }
810
811         start_epoch = le32_to_cpu(lsd->lsd_start_epoch);
812
813         CDEBUG(D_INODE, "%s: server start_epoch : %#x\n",
814                obd->obd_name, start_epoch);
815         CDEBUG(D_INODE, "%s: server last_transno : "LPX64"\n",
816                obd->obd_name, le64_to_cpu(lsd->lsd_last_transno));
817         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
818                obd->obd_name, mount_count + 1);
819         CDEBUG(D_INODE, "%s: server data size: %u\n",
820                obd->obd_name, le32_to_cpu(lsd->lsd_server_size));
821         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
822                obd->obd_name, le32_to_cpu(lsd->lsd_client_start));
823         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
824                obd->obd_name, le32_to_cpu(lsd->lsd_client_size));
825         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
826                obd->obd_name, le16_to_cpu(lsd->lsd_subdir_count));
827         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
828                last_rcvd_size <= le32_to_cpu(lsd->lsd_client_start) ? 0 :
829                (last_rcvd_size - le32_to_cpu(lsd->lsd_client_start)) /
830                 le16_to_cpu(lsd->lsd_client_size));
831
832         if (!obd->obd_replayable) {
833                 CWARN("%s: recovery support OFF\n", obd->obd_name);
834                 GOTO(out, rc = 0);
835         }
836
837         OBD_ALLOC_PTR(lcd);
838         if (!lcd)
839                 GOTO(err_client, rc = -ENOMEM);
840
841         for (cl_idx = 0, off = le32_to_cpu(lsd->lsd_client_start);
842              off < last_rcvd_size; cl_idx++) {
843                 __u64 last_rcvd;
844                 struct obd_export *exp;
845                 struct filter_export_data *fed;
846
847                 /* Don't assume off is incremented properly by
848                  * fsfilt_read_record(), in case sizeof(*lcd)
849                  * isn't the same as lsd->lsd_client_size.  */
850                 off = le32_to_cpu(lsd->lsd_client_start) +
851                         cl_idx * le16_to_cpu(lsd->lsd_client_size);
852                 rc = fsfilt_read_record(obd, filp, lcd, sizeof(*lcd), &off);
853                 if (rc) {
854                         CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
855                                LAST_RCVD, cl_idx, off, rc);
856                         break; /* read error shouldn't cause startup to fail */
857                 }
858
859                 if (lcd->lcd_uuid[0] == '\0') {
860                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
861                                cl_idx);
862                         continue;
863                 }
864
865                 check_lcd(obd->obd_name, cl_idx, lcd);
866
867                 last_rcvd = le64_to_cpu(lcd->lcd_last_transno);
868
869                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
870                        " srv lr: "LPU64"\n", lcd->lcd_uuid, cl_idx,
871                        last_rcvd, le64_to_cpu(lsd->lsd_last_transno));
872
873                 /* These exports are cleaned up by filter_disconnect(), so they
874                  * need to be set up like real exports as filter_connect() does.
875                  */
876                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
877                 if (IS_ERR(exp)) {
878                         if (PTR_ERR(exp) == -EALREADY) {
879                                 /* export already exists, zero out this one */
880                                 CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
881                                 continue;
882                         }
883                         OBD_FREE_PTR(lcd);
884                         GOTO(err_client, rc = PTR_ERR(exp));
885                 }
886
887                 fed = &exp->exp_filter_data;
888                 *fed->fed_ted.ted_lcd = *lcd;
889                 fed->fed_group = 0; /* will be assigned at connect */
890                 filter_export_stats_init(obd, exp, NULL);
891                 rc = filter_client_add(obd, exp, cl_idx);
892                 /* can't fail for existing client */
893                 LASSERTF(rc == 0, "rc = %d\n", rc);
894
895                 /* VBR: set export last committed */
896                 exp->exp_last_committed = last_rcvd;
897                 cfs_spin_lock(&exp->exp_lock);
898                 exp->exp_connecting = 0;
899                 exp->exp_in_recovery = 0;
900                 cfs_spin_unlock(&exp->exp_lock);
901                 obd->obd_max_recoverable_clients++;
902                 class_export_put(exp);
903
904                 if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
905                         lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
906         }
907         OBD_FREE_PTR(lcd);
908
909         obd->obd_last_committed = le64_to_cpu(lsd->lsd_last_transno);
910 out:
911         obd->u.obt.obt_mount_count = mount_count + 1;
912         obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
913         lsd->lsd_mount_count = cpu_to_le64(obd->u.obt.obt_mount_count);
914
915         /* save it, so mount count and last_transno is current */
916         rc = filter_update_server_data(obd);
917         if (rc)
918                 GOTO(err_client, rc);
919
920         RETURN(0);
921
922 err_client:
923         class_disconnect_exports(obd);
924 err_lut:
925         filter_free_server_data(&obd->u.obt);
926         RETURN(rc);
927 }
928
929 static int filter_cleanup_groups(struct obd_device *obd)
930 {
931         struct filter_obd *filter = &obd->u.filter;
932         struct file *filp;
933         struct dentry *dentry;
934         int i, j;
935         ENTRY;
936
937         if (filter->fo_dentry_O_groups != NULL) {
938                 for (i = 0; i < filter->fo_group_count; i++) {
939                         dentry = filter->fo_dentry_O_groups[i];
940                         if (dentry != NULL)
941                                 f_dput(dentry);
942                 }
943                 OBD_FREE(filter->fo_dentry_O_groups,
944                          filter->fo_group_count *
945                          sizeof(*filter->fo_dentry_O_groups));
946                 filter->fo_dentry_O_groups = NULL;
947         }
948         if (filter->fo_last_objid_files != NULL) {
949                 for (i = 0; i < filter->fo_group_count; i++) {
950                         filp = filter->fo_last_objid_files[i];
951                         if (filp != NULL)
952                                 filp_close(filp, 0);
953                 }
954                 OBD_FREE(filter->fo_last_objid_files,
955                          filter->fo_group_count *
956                          sizeof(*filter->fo_last_objid_files));
957                 filter->fo_last_objid_files = NULL;
958         }
959         if (filter->fo_dentry_O_sub != NULL) {
960                 for (i = 0; i < filter->fo_group_count; i++) {
961                         for (j = 0; j < filter->fo_subdir_count; j++) {
962                                 dentry = filter->fo_dentry_O_sub[i].dentry[j];
963                                 if (dentry != NULL)
964                                         f_dput(dentry);
965                         }
966                 }
967                 OBD_FREE(filter->fo_dentry_O_sub,
968                          filter->fo_group_count *
969                          sizeof(*filter->fo_dentry_O_sub));
970                 filter->fo_dentry_O_sub = NULL;
971         }
972         if (filter->fo_last_objids != NULL) {
973                 OBD_FREE(filter->fo_last_objids,
974                          filter->fo_group_count *
975                          sizeof(*filter->fo_last_objids));
976                 filter->fo_last_objids = NULL;
977         }
978         if (filter->fo_dentry_O != NULL) {
979                 f_dput(filter->fo_dentry_O);
980                 filter->fo_dentry_O = NULL;
981         }
982         RETURN(0);
983 }
984
985 static int filter_update_last_group(struct obd_device *obd, int group)
986 {
987         struct filter_obd *filter = &obd->u.filter;
988         struct file *filp = NULL;
989         int last_group = 0, rc;
990         loff_t off = 0;
991         ENTRY;
992
993         if (group <= filter->fo_committed_group)
994                 RETURN(0);
995
996         filp = filp_open("LAST_GROUP", O_RDWR, 0700);
997         if (IS_ERR(filp)) {
998                 rc = PTR_ERR(filp);
999                 filp = NULL;
1000                 CERROR("cannot open LAST_GROUP: rc = %d\n", rc);
1001                 GOTO(cleanup, rc);
1002         }
1003
1004         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
1005         if (rc) {
1006                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n",rc);
1007                 GOTO(cleanup, rc);
1008         }
1009
1010         CDEBUG(D_INODE, "%s: previous %d, new %d\n",
1011                obd->obd_name, last_group, group);
1012
1013         off = 0;
1014         last_group = group;
1015         /* must be sync: bXXXX */
1016         rc = fsfilt_write_record(obd, filp, &last_group, sizeof(__u32), &off, 1);
1017         if (rc) {
1018                 CDEBUG(D_INODE, "error updating LAST_GROUP: rc %d\n", rc);
1019                 GOTO(cleanup, rc);
1020         }
1021
1022         filter->fo_committed_group = group;
1023 cleanup:
1024         if (filp)
1025                 filp_close(filp, 0);
1026         RETURN(rc);
1027 }
1028
1029 static int filter_read_group_internal(struct obd_device *obd, int group,
1030                                       int create)
1031 {
1032         struct filter_obd *filter = &obd->u.filter;
1033         __u64 *new_objids = NULL;
1034         struct filter_subdirs *new_subdirs = NULL, *tmp_subdirs = NULL;
1035         struct dentry **new_groups = NULL;
1036         struct file **new_files = NULL;
1037         struct dentry *dentry;
1038         struct file *filp;
1039         int old_count = filter->fo_group_count, rc, stage = 0, i;
1040         char name[25];
1041         __u64 last_objid;
1042         loff_t off = 0;
1043         int len = group + 1;
1044
1045         snprintf(name, 24, "%d", group);
1046         name[24] = '\0';
1047
1048         if (!create) {
1049                 dentry = ll_lookup_one_len(name, filter->fo_dentry_O,
1050                                            strlen(name));
1051                 if (IS_ERR(dentry)) {
1052                         CERROR("Cannot lookup expected object group %d: %ld\n",
1053                                group, PTR_ERR(dentry));
1054                         RETURN(PTR_ERR(dentry));
1055                 }
1056         } else {
1057                 dentry = simple_mkdir(filter->fo_dentry_O,
1058                                       obd->u.obt.obt_vfsmnt, name, 0700, 1);
1059                 if (IS_ERR(dentry)) {
1060                         CERROR("cannot lookup/create O/%s: rc = %ld\n", name,
1061                                PTR_ERR(dentry));
1062                         RETURN(PTR_ERR(dentry));
1063                 }
1064         }
1065         stage = 1;
1066
1067         snprintf(name, 24, "O/%d/LAST_ID", group);
1068         name[24] = '\0';
1069         filp = filp_open(name, O_CREAT | O_RDWR, 0700);
1070         if (IS_ERR(filp)) {
1071                 CERROR("cannot create %s: rc = %ld\n", name, PTR_ERR(filp));
1072                 GOTO(cleanup, rc = PTR_ERR(filp));
1073         }
1074         stage = 2;
1075
1076         rc = fsfilt_read_record(obd, filp, &last_objid, sizeof(__u64), &off);
1077         if (rc) {
1078                 CDEBUG(D_INODE, "error reading %s: rc %d\n", name, rc);
1079                 GOTO(cleanup, rc);
1080         }
1081
1082         if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
1083                 OBD_ALLOC(tmp_subdirs, sizeof(*tmp_subdirs));
1084                 if (tmp_subdirs == NULL)
1085                         GOTO(cleanup, rc = -ENOMEM);
1086                 stage = 3;
1087
1088                 for (i = 0; i < filter->fo_subdir_count; i++) {
1089                         char dir[20];
1090                         snprintf(dir, sizeof(dir), "d%u", i);
1091
1092                         tmp_subdirs->dentry[i] = simple_mkdir(dentry,
1093                                                               obd->u.obt.obt_vfsmnt,
1094                                                               dir, 0700, 1);
1095                         if (IS_ERR(tmp_subdirs->dentry[i])) {
1096                                 rc = PTR_ERR(tmp_subdirs->dentry[i]);
1097                                 CERROR("can't lookup/create O/%d/%s: rc = %d\n",
1098                                        group, dir, rc);
1099                                 GOTO(cleanup, rc);
1100                         }
1101
1102                         CDEBUG(D_INODE, "got/created O/%d/%s: %p\n", group, dir,
1103                                tmp_subdirs->dentry[i]);
1104                 }
1105         }
1106
1107         /* 'group' is an index; we need an array of length 'group + 1' */
1108         if (group + 1 > old_count) {
1109                 OBD_ALLOC(new_objids, len * sizeof(*new_objids));
1110                 OBD_ALLOC(new_subdirs, len * sizeof(*new_subdirs));
1111                 OBD_ALLOC(new_groups, len * sizeof(*new_groups));
1112                 OBD_ALLOC(new_files, len * sizeof(*new_files));
1113                 stage = 4;
1114                 if (new_objids == NULL || new_subdirs == NULL ||
1115                     new_groups == NULL || new_files == NULL)
1116                         GOTO(cleanup, rc = -ENOMEM);
1117
1118                 if (old_count) {
1119                         memcpy(new_objids, filter->fo_last_objids,
1120                                old_count * sizeof(*new_objids));
1121                         memcpy(new_subdirs, filter->fo_dentry_O_sub,
1122                                old_count * sizeof(*new_subdirs));
1123                         memcpy(new_groups, filter->fo_dentry_O_groups,
1124                                old_count * sizeof(*new_groups));
1125                         memcpy(new_files, filter->fo_last_objid_files,
1126                                old_count * sizeof(*new_files));
1127
1128                         OBD_FREE(filter->fo_last_objids,
1129                                  old_count * sizeof(*new_objids));
1130                         OBD_FREE(filter->fo_dentry_O_sub,
1131                                  old_count * sizeof(*new_subdirs));
1132                         OBD_FREE(filter->fo_dentry_O_groups,
1133                                  old_count * sizeof(*new_groups));
1134                         OBD_FREE(filter->fo_last_objid_files,
1135                                  old_count * sizeof(*new_files));
1136                 }
1137                 filter->fo_last_objids = new_objids;
1138                 filter->fo_dentry_O_sub = new_subdirs;
1139                 filter->fo_dentry_O_groups = new_groups;
1140                 filter->fo_last_objid_files = new_files;
1141                 filter->fo_group_count = len;
1142         }
1143
1144         filter->fo_dentry_O_groups[group] = dentry;
1145         filter->fo_last_objid_files[group] = filp;
1146         if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
1147                 filter->fo_dentry_O_sub[group] = *tmp_subdirs;
1148                 OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
1149         }
1150
1151         filter_update_last_group(obd, group);
1152
1153         if (i_size_read(filp->f_dentry->d_inode) == 0) {
1154                 filter->fo_last_objids[group] = FILTER_INIT_OBJID;
1155                 rc = filter_update_last_objid(obd, group, 1);
1156                 RETURN(rc);
1157         }
1158
1159         filter->fo_last_objids[group] = le64_to_cpu(last_objid);
1160         CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
1161                obd->obd_name, group, last_objid);
1162         RETURN(0);
1163  cleanup:
1164         switch (stage) {
1165         case 4:
1166                 if (new_objids != NULL)
1167                         OBD_FREE(new_objids, len * sizeof(*new_objids));
1168                 if (new_subdirs != NULL)
1169                         OBD_FREE(new_subdirs, len * sizeof(*new_subdirs));
1170                 if (new_groups != NULL)
1171                         OBD_FREE(new_groups, len * sizeof(*new_groups));
1172                 if (new_files != NULL)
1173                         OBD_FREE(new_files, len * sizeof(*new_files));
1174         case 3:
1175                 if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
1176                         for (i = 0; i < filter->fo_subdir_count; i++) {
1177                                 if (tmp_subdirs->dentry[i] != NULL)
1178                                         dput(tmp_subdirs->dentry[i]);
1179                         }
1180                         OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
1181                 }
1182         case 2:
1183                 filp_close(filp, 0);
1184         case 1:
1185                 dput(dentry);
1186         }
1187         RETURN(rc);
1188 }
1189
1190 static int filter_read_groups(struct obd_device *obd, int last_group,
1191                               int create)
1192 {
1193         struct filter_obd *filter = &obd->u.filter;
1194         int old_count, group, rc = 0;
1195
1196         cfs_mutex_lock(&filter->fo_init_lock);
1197         old_count = filter->fo_group_count;
1198         for (group = old_count; group <= last_group; group++) {
1199                 rc = filter_read_group_internal(obd, group, create);
1200                 if (rc != 0)
1201                         break;
1202         }
1203         cfs_mutex_unlock(&filter->fo_init_lock);
1204         return rc;
1205 }
1206
1207 /* FIXME: object groups */
1208 static int filter_prep_groups(struct obd_device *obd)
1209 {
1210         struct filter_obd *filter = &obd->u.filter;
1211         struct dentry *O_dentry;
1212         struct file *filp;
1213         int    last_group, rc = 0, cleanup_phase = 0;
1214         loff_t off = 0;
1215         ENTRY;
1216
1217         O_dentry = simple_mkdir(cfs_fs_pwd(current->fs), obd->u.obt.obt_vfsmnt,
1218                                 "O", 0700, 1);
1219         CDEBUG(D_INODE, "%s: got/created O: %p\n", obd->obd_name, O_dentry);
1220         if (IS_ERR(O_dentry)) {
1221                 rc = PTR_ERR(O_dentry);
1222                 CERROR("%s: cannot open/create O: rc = %d\n", obd->obd_name,rc);
1223                 GOTO(cleanup, rc);
1224         }
1225         filter->fo_dentry_O = O_dentry;
1226         cleanup_phase = 1; /* O_dentry */
1227
1228         /* we have to initialize all groups before first connections from
1229          * clients because they may send create/destroy for any group -bzzz */
1230         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
1231         if (IS_ERR(filp)) {
1232                 CERROR("%s: cannot create LAST_GROUP: rc = %ld\n",
1233                        obd->obd_name, PTR_ERR(filp));
1234                 GOTO(cleanup, rc = PTR_ERR(filp));
1235         }
1236         cleanup_phase = 2; /* filp */
1237
1238         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
1239         if (rc) {
1240                 CERROR("%s: error reading LAST_GROUP: rc %d\n",
1241                        obd->obd_name, rc);
1242                 GOTO(cleanup, rc);
1243         }
1244
1245         if (off == 0)
1246                 last_group = FID_SEQ_OST_MDT0;
1247
1248         CDEBUG(D_INODE, "%s: initialize group %u (max %u)\n", obd->obd_name,
1249                FID_SEQ_OST_MDT0, last_group);
1250         filter->fo_committed_group = last_group;
1251         rc = filter_read_groups(obd, last_group, 1);
1252         if (rc)
1253                 GOTO(cleanup, rc);
1254
1255         filp_close(filp, 0);
1256         RETURN(0);
1257
1258  cleanup:
1259         switch (cleanup_phase) {
1260         case 2:
1261                 filp_close(filp, 0);
1262         case 1:
1263                 filter_cleanup_groups(obd);
1264                 f_dput(filter->fo_dentry_O);
1265                 filter->fo_dentry_O = NULL;
1266         default:
1267                 break;
1268         }
1269         return rc;
1270
1271 }
1272
1273 /* setup the object store with correct subdirectories */
1274 static int filter_prep(struct obd_device *obd)
1275 {
1276         struct lvfs_run_ctxt saved;
1277         struct filter_obd *filter = &obd->u.filter;
1278         struct file *file;
1279         struct inode *inode;
1280         int rc = 0;
1281         ENTRY;
1282
1283         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1284         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
1285         if (!file || IS_ERR(file)) {
1286                 rc = PTR_ERR(file);
1287                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
1288                        LAST_RCVD, rc);
1289                 GOTO(out, rc);
1290         }
1291         obd->u.obt.obt_rcvd_filp = file;
1292         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
1293                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
1294                        file->f_dentry->d_inode->i_mode);
1295                 GOTO(err_filp, rc = -ENOENT);
1296         }
1297
1298         inode = file->f_dentry->d_parent->d_inode;
1299         /* We use i_op->unlink directly in filter_vfs_unlink() */
1300         if (!inode->i_op || !inode->i_op->create || !inode->i_op->unlink) {
1301                 CERROR("%s: filesystem does not support create/unlink ops\n",
1302                        obd->obd_name);
1303                 GOTO(err_filp, rc = -EOPNOTSUPP);
1304         }
1305
1306         rc = filter_init_server_data(obd, file);
1307         if (rc) {
1308                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
1309                 GOTO(err_filp, rc);
1310         }
1311         LASSERT(obd->u.obt.obt_lut);
1312         target_recovery_init(obd->u.obt.obt_lut, ost_handle);
1313
1314         /* open and create health check io file*/
1315         file = filp_open(HEALTH_CHECK, O_RDWR | O_CREAT, 0644);
1316         if (IS_ERR(file)) {
1317                 rc = PTR_ERR(file);
1318                 CERROR("OBD filter: cannot open/create %s rc = %d\n",
1319                        HEALTH_CHECK, rc);
1320                 GOTO(err_server_data, rc);
1321         }
1322         filter->fo_obt.obt_health_check_filp = file;
1323         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
1324                 CERROR("%s is not a regular file!: mode = %o\n", HEALTH_CHECK,
1325                        file->f_dentry->d_inode->i_mode);
1326                 GOTO(err_health_check, rc = -ENOENT);
1327         }
1328         rc = lvfs_check_io_health(obd, file);
1329         if (rc)
1330                 GOTO(err_health_check, rc);
1331
1332         rc = filter_prep_groups(obd);
1333         if (rc)
1334                 GOTO(err_health_check, rc);
1335 out:
1336         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1337
1338         return(rc);
1339
1340 err_health_check:
1341         if (filp_close(filter->fo_obt.obt_health_check_filp, 0))
1342                 CERROR("can't close %s after error\n", HEALTH_CHECK);
1343         filter->fo_obt.obt_health_check_filp = NULL;
1344 err_server_data:
1345         target_recovery_fini(obd);
1346         filter_free_server_data(&obd->u.obt);
1347 err_filp:
1348         if (filp_close(obd->u.obt.obt_rcvd_filp, 0))
1349                 CERROR("can't close %s after error\n", LAST_RCVD);
1350         obd->u.obt.obt_rcvd_filp = NULL;
1351         goto out;
1352 }
1353
1354 /* cleanup the filter: write last used object id to status file */
1355 static void filter_post(struct obd_device *obd)
1356 {
1357         struct lvfs_run_ctxt saved;
1358         struct filter_obd *filter = &obd->u.filter;
1359         int rc, i;
1360
1361         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
1362          * best to start a transaction with h_sync, because we removed this
1363          * from lastobjid */
1364
1365         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1366         rc = filter_update_server_data(obd);
1367         if (rc)
1368                 CERROR("error writing server data: rc = %d\n", rc);
1369
1370         for (i = 0; i < filter->fo_group_count; i++) {
1371                 rc = filter_update_last_objid(obd, i,
1372                                 (i == filter->fo_group_count - 1));
1373                 if (rc)
1374                         CERROR("error writing group %d lastobjid: rc = %d\n",
1375                                i, rc);
1376         }
1377
1378         rc = filp_close(obd->u.obt.obt_rcvd_filp, 0);
1379         obd->u.obt.obt_rcvd_filp = NULL;
1380         if (rc)
1381                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
1382
1383         rc = filp_close(filter->fo_obt.obt_health_check_filp, 0);
1384         filter->fo_obt.obt_health_check_filp = NULL;
1385         if (rc)
1386                 CERROR("error closing %s: rc = %d\n", HEALTH_CHECK, rc);
1387
1388         filter_cleanup_groups(obd);
1389         filter_free_server_data(&obd->u.obt);
1390         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1391
1392         filter_free_capa_keys(filter);
1393         cleanup_capa_hash(filter->fo_capa_hash);
1394 }
1395
1396 static void filter_set_last_id(struct filter_obd *filter,
1397                                obd_id id, obd_seq group)
1398 {
1399         LASSERT(group <= filter->fo_group_count);
1400
1401         cfs_spin_lock(&filter->fo_objidlock);
1402         filter->fo_last_objids[group] = id;
1403         cfs_spin_unlock(&filter->fo_objidlock);
1404 }
1405
1406 obd_id filter_last_id(struct filter_obd *filter, obd_seq group)
1407 {
1408         obd_id id;
1409         LASSERT(group <= filter->fo_group_count);
1410         LASSERT(filter->fo_last_objids != NULL);
1411
1412         /* FIXME: object groups */
1413         cfs_spin_lock(&filter->fo_objidlock);
1414         id = filter->fo_last_objids[group];
1415         cfs_spin_unlock(&filter->fo_objidlock);
1416         return id;
1417 }
1418
1419 static int filter_lock_dentry(struct obd_device *obd, struct dentry *dparent)
1420 {
1421         mutex_lock_nested(&dparent->d_inode->i_mutex, I_MUTEX_PARENT);
1422         return 0;
1423 }
1424
1425 /* We never dget the object parent, so DON'T dput it either */
1426 struct dentry *filter_parent(struct obd_device *obd, obd_seq group, obd_id objid)
1427 {
1428         struct filter_obd *filter = &obd->u.filter;
1429         struct filter_subdirs *subdirs;
1430
1431         if (group >= filter->fo_group_count) /* FIXME: object groups */
1432                 return ERR_PTR(-EBADF);
1433
1434         if (!fid_seq_is_mdt(group) || filter->fo_subdir_count == 0)
1435                 return filter->fo_dentry_O_groups[group];
1436
1437         subdirs = &filter->fo_dentry_O_sub[group];
1438         return subdirs->dentry[objid & (filter->fo_subdir_count - 1)];
1439 }
1440
1441 /* We never dget the object parent, so DON'T dput it either */
1442 struct dentry *filter_parent_lock(struct obd_device *obd, obd_seq group,
1443                                   obd_id objid)
1444 {
1445         unsigned long now = jiffies;
1446         struct dentry *dparent = filter_parent(obd, group, objid);
1447         int rc;
1448
1449         if (IS_ERR(dparent))
1450                 return dparent;
1451         if (dparent == NULL)
1452                 return ERR_PTR(-ENOENT);
1453
1454         rc = filter_lock_dentry(obd, dparent);
1455         fsfilt_check_slow(obd, now, "parent lock");
1456         return rc ? ERR_PTR(rc) : dparent;
1457 }
1458
1459 /* We never dget the object parent, so DON'T dput it either */
1460 static void filter_parent_unlock(struct dentry *dparent)
1461 {
1462         mutex_unlock(&dparent->d_inode->i_mutex);
1463 }
1464
1465 /* How to get files, dentries, inodes from object id's.
1466  *
1467  * If dir_dentry is passed, the caller has already locked the parent
1468  * appropriately for this operation (normally a write lock).  If
1469  * dir_dentry is NULL, we do a read lock while we do the lookup to
1470  * avoid races with create/destroy and such changing the directory
1471  * internal to the filesystem code. */
1472 struct dentry *filter_fid2dentry(struct obd_device *obd,
1473                                  struct dentry *dir_dentry,
1474                                  obd_seq group, obd_id id)
1475 {
1476         struct dentry *dparent = dir_dentry;
1477         struct dentry *dchild;
1478         char name[32];
1479         int len;
1480         ENTRY;
1481
1482         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOENT) &&
1483             obd->u.filter.fo_destroys_in_progress == 0) {
1484                 /* don't fail lookups for orphan recovery, it causes
1485                  * later LBUGs when objects still exist during precreate */
1486                 CDEBUG(D_INFO, "*** cfs_fail_loc=%x ***\n",OBD_FAIL_OST_ENOENT);
1487                 RETURN(ERR_PTR(-ENOENT));
1488         }
1489         if (id == 0) {
1490                 CERROR("fatal: invalid object id 0\n");
1491                 RETURN(ERR_PTR(-ESTALE));
1492         }
1493
1494         len = sprintf(name, LPU64, id);
1495         if (dir_dentry == NULL) {
1496                 dparent = filter_parent_lock(obd, group, id);
1497                 if (IS_ERR(dparent)) {
1498                         CERROR("%s: error getting object "POSTID
1499                                " parent: rc %ld\n", obd->obd_name,
1500                                id, group, PTR_ERR(dparent));
1501                         RETURN(dparent);
1502                 }
1503         }
1504         CDEBUG(D_INODE, "looking up object O/%.*s/%s\n",
1505                dparent->d_name.len, dparent->d_name.name, name);
1506         /* dparent is already locked here, so we cannot use ll_lookup_one_len() */
1507         dchild = lookup_one_len(name, dparent, len);
1508         if (dir_dentry == NULL)
1509                 filter_parent_unlock(dparent);
1510         if (IS_ERR(dchild)) {
1511                 CERROR("%s: object "LPU64":"LPU64" lookup error: rc %ld\n",
1512                        obd->obd_name, id, group, PTR_ERR(dchild));
1513                 RETURN(dchild);
1514         }
1515
1516         if (dchild->d_inode != NULL && is_bad_inode(dchild->d_inode)) {
1517                 CERROR("%s: got bad object "LPU64" inode %lu\n",
1518                        obd->obd_name, id, dchild->d_inode->i_ino);
1519                 f_dput(dchild);
1520                 RETURN(ERR_PTR(-ENOENT));
1521         }
1522
1523         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1524                name, dchild, atomic_read(&dchild->d_count));
1525
1526         LASSERT(atomic_read(&dchild->d_count) > 0);
1527
1528         RETURN(dchild);
1529 }
1530
1531 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
1532                                   obd_id group, struct lustre_handle *lockh)
1533 {
1534         int flags = LDLM_AST_DISCARD_DATA, rc;
1535         struct ldlm_res_id res_id;
1536         ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
1537         ENTRY;
1538
1539         osc_build_res_name(objid, group, &res_id);
1540         /* Tell the clients that the object is gone now and that they should
1541          * throw away any cached pages. */
1542         rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_EXTENT,
1543                                     &policy, LCK_PW, &flags, ldlm_blocking_ast,
1544                                     ldlm_completion_ast, NULL, NULL, 0, NULL,
1545                                     lockh);
1546         if (rc != ELDLM_OK)
1547                 lockh->cookie = 0;
1548         RETURN(rc);
1549 }
1550
1551 static void filter_fini_destroy(struct obd_device *obd,
1552                                 struct lustre_handle *lockh)
1553 {
1554         if (lustre_handle_is_used(lockh))
1555                 ldlm_lock_decref(lockh, LCK_PW);
1556 }
1557
1558 /* This is vfs_unlink() without down(i_sem).  If we call regular vfs_unlink()
1559  * we have 2.6 lock ordering issues with filter_commitrw_write() as it takes
1560  * i_sem before starting a handle, while filter_destroy() + vfs_unlink do the
1561  * reverse.  Caller must take i_sem before starting the transaction and we
1562  * drop it here before the inode is removed from the dentry.  bug 4180/6984 */
1563 int filter_vfs_unlink(struct inode *dir, struct dentry *dentry,
1564                       struct vfsmount *mnt)
1565 {
1566         int rc;
1567         ENTRY;
1568
1569         /* don't need dir->i_zombie for 2.4, it is for rename/unlink of dir
1570          * itself we already hold dir->i_mutex for child create/unlink ops */
1571         LASSERT(dentry->d_inode != NULL);
1572         LASSERT(mutex_trylock(&dir->i_mutex) == 0);
1573         LASSERT(mutex_trylock(&dentry->d_inode->i_mutex) == 0);
1574
1575
1576         /* may_delete() */
1577         if (/*!dentry->d_inode ||*/dentry->d_parent->d_inode != dir)
1578                 GOTO(out, rc = -ENOENT);
1579
1580         rc = ll_permission(dir, MAY_WRITE | MAY_EXEC, NULL);
1581         if (rc)
1582                 GOTO(out, rc);
1583
1584         if (IS_APPEND(dir))
1585                 GOTO(out, rc = -EPERM);
1586
1587         /* check_sticky() */
1588         if ((dentry->d_inode->i_uid != cfs_curproc_fsuid() &&
1589              !cfs_capable(CFS_CAP_FOWNER)) || IS_APPEND(dentry->d_inode) ||
1590             IS_IMMUTABLE(dentry->d_inode))
1591                 GOTO(out, rc = -EPERM);
1592
1593         /* Locking order: i_mutex -> journal_lock -> dqptr_sem. LU-952 */
1594         ll_vfs_dq_init(dir);
1595
1596         rc = ll_security_inode_unlink(dir, dentry, mnt);
1597         if (rc)
1598                 GOTO(out, rc);
1599
1600         rc = dir->i_op->unlink(dir, dentry);
1601 out:
1602         /* need to drop i_mutex before we lose inode reference */
1603         mutex_unlock(&dentry->d_inode->i_mutex);
1604         if (rc == 0)
1605                 d_delete(dentry);
1606
1607         RETURN(rc);
1608 }
1609
1610 /* Caller must hold LCK_PW on parent and push us into kernel context.
1611  * Caller must hold child i_mutex, we drop it always.
1612  * Caller is also required to ensure that dchild->d_inode exists. */
1613 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1614                                    obd_seq group, struct dentry *dparent,
1615                                    struct dentry *dchild)
1616 {
1617         struct inode *inode = dchild->d_inode;
1618         int rc;
1619
1620         /* There should be 2 references to the inode:
1621          *  1) taken by filter_prepare_destroy
1622          *  2) taken by filter_destroy */
1623         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 2) {
1624                 CERROR("destroying objid %.*s ino %lu nlink %lu count %d\n",
1625                        dchild->d_name.len, dchild->d_name.name, inode->i_ino,
1626                        (unsigned long)inode->i_nlink,
1627                        atomic_read(&inode->i_count));
1628         }
1629
1630         rc = filter_vfs_unlink(dparent->d_inode, dchild, obd->u.obt.obt_vfsmnt);
1631         if (rc)
1632                 CERROR("error unlinking objid %.*s: rc %d\n",
1633                        dchild->d_name.len, dchild->d_name.name, rc);
1634         return(rc);
1635 }
1636
1637 struct filter_intent_args {
1638         struct ldlm_lock **victim;
1639         __u64 size;
1640         int *liblustre;
1641 };
1642
1643 static enum interval_iter filter_intent_cb(struct interval_node *n,
1644                                            void *args)
1645 {
1646         struct ldlm_interval *node = (struct ldlm_interval *)n;
1647         struct filter_intent_args *arg = (struct filter_intent_args*)args;
1648         __u64 size = arg->size;
1649         struct ldlm_lock **v = arg->victim;
1650         struct ldlm_lock *lck;
1651
1652         /* If the interval is lower than the current file size,
1653          * just break. */
1654         if (interval_high(n) <= size)
1655                 return INTERVAL_ITER_STOP;
1656
1657         cfs_list_for_each_entry(lck, &node->li_group, l_sl_policy) {
1658                 /* Don't send glimpse ASTs to liblustre clients.
1659                  * They aren't listening for them, and they do
1660                  * entirely synchronous I/O anyways. */
1661                 if (lck->l_export == NULL ||
1662                     lck->l_export->exp_libclient == 1)
1663                         continue;
1664
1665                 if (*arg->liblustre)
1666                         *arg->liblustre = 0;
1667
1668                 if (*v == NULL) {
1669                         *v = LDLM_LOCK_GET(lck);
1670                 } else if ((*v)->l_policy_data.l_extent.start <
1671                            lck->l_policy_data.l_extent.start) {
1672                         LDLM_LOCK_RELEASE(*v);
1673                         *v = LDLM_LOCK_GET(lck);
1674                 }
1675
1676                 /* the same policy group - every lock has the
1677                  * same extent, so needn't do it any more */
1678                 break;
1679         }
1680
1681         return INTERVAL_ITER_CONT;
1682 }
1683
1684 static int filter_intent_policy(struct ldlm_namespace *ns,
1685                                 struct ldlm_lock **lockp, void *req_cookie,
1686                                 ldlm_mode_t mode, int flags, void *data)
1687 {
1688         struct ptlrpc_request *req = req_cookie;
1689         struct ldlm_lock *lock = *lockp, *l = NULL;
1690         struct ldlm_resource *res = lock->l_resource;
1691         ldlm_processing_policy policy;
1692         struct ost_lvb *res_lvb, *reply_lvb;
1693         struct ldlm_reply *rep;
1694         ldlm_error_t err;
1695         int idx, rc, tmpflags = 0, only_liblustre = 1;
1696         struct ldlm_interval_tree *tree;
1697         struct filter_intent_args arg;
1698         __u32 repsize[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
1699                            [DLM_LOCKREPLY_OFF]   = sizeof(*rep),
1700                            [DLM_REPLY_REC_OFF]   = sizeof(*reply_lvb) };
1701         ENTRY;
1702
1703         policy = ldlm_get_processing_policy(res);
1704         LASSERT(policy != NULL);
1705         LASSERT(req != NULL);
1706
1707         rc = lustre_pack_reply(req, 3, repsize, NULL);
1708         if (rc)
1709                 RETURN(req->rq_status = rc);
1710
1711         rep = lustre_msg_buf(req->rq_repmsg, DLM_LOCKREPLY_OFF, sizeof(*rep));
1712         LASSERT(rep != NULL);
1713
1714         reply_lvb = lustre_msg_buf(req->rq_repmsg, DLM_REPLY_REC_OFF,
1715                                    sizeof(*reply_lvb));
1716         LASSERT(reply_lvb != NULL);
1717
1718         //fixup_handle_for_resent_req(req, lock, &lockh);
1719
1720         /* Call the extent policy function to see if our request can be
1721          * granted, or is blocked.
1722          * If the OST lock has LDLM_FL_HAS_INTENT set, it means a glimpse
1723          * lock, and should not be granted if the lock will be blocked.
1724          */
1725
1726         if (flags & LDLM_FL_BLOCK_NOWAIT) {
1727                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_AGL_DELAY, 5);
1728
1729                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_AGL_NOLOCK))
1730                         RETURN(ELDLM_LOCK_ABORTED);
1731         }
1732
1733         LASSERT(ns == ldlm_res_to_ns(res));
1734         lock_res(res);
1735         rc = policy(lock, &tmpflags, 0, &err, NULL);
1736         check_res_locked(res);
1737
1738         /* The lock met with no resistance; we're finished. */
1739         if (rc == LDLM_ITER_CONTINUE) {
1740                 /* do not grant locks to the liblustre clients: they cannot
1741                  * handle ASTs robustly.  We need to do this while still
1742                  * holding lr_lock to avoid the lock remaining on the res_link
1743                  * list (and potentially being added to l_pending_list by an
1744                  * AST) when we are going to drop this lock ASAP. */
1745                 if (lock->l_export->exp_libclient ||
1746                     OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2)) {
1747                         ldlm_resource_unlink_lock(lock);
1748                         err = ELDLM_LOCK_ABORTED;
1749                 } else {
1750                         err = ELDLM_LOCK_REPLACED;
1751                 }
1752                 unlock_res(res);
1753                 RETURN(err);
1754         } else if (flags & LDLM_FL_BLOCK_NOWAIT) {
1755                 /* LDLM_FL_BLOCK_NOWAIT means it is for AGL. Do not send glimpse
1756                  * callback for glimpse size. The real size user will trigger
1757                  * the glimpse callback when necessary. */
1758                 unlock_res(res);
1759                 RETURN(ELDLM_LOCK_ABORTED);
1760         }
1761
1762         /* Do not grant any lock, but instead send GL callbacks.  The extent
1763          * policy nicely created a list of all PW locks for us.  We will choose
1764          * the highest of those which are larger than the size in the LVB, if
1765          * any, and perform a glimpse callback. */
1766         res_lvb = res->lr_lvb_data;
1767         LASSERT(res_lvb != NULL);
1768         *reply_lvb = *res_lvb;
1769
1770         /*
1771          * lr_lock guarantees that no new locks are granted, and,
1772          * therefore, that res->lr_lvb_data cannot increase beyond the
1773          * end of already granted lock. As a result, it is safe to
1774          * check against "stale" reply_lvb->lvb_size value without
1775          * res->lr_lvb_mutex.
1776          */
1777         arg.size = reply_lvb->lvb_size;
1778         arg.victim = &l;
1779         arg.liblustre = &only_liblustre;
1780         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1781                 tree = &res->lr_itree[idx];
1782                 if (tree->lit_mode == LCK_PR)
1783                         continue;
1784
1785                 interval_iterate_reverse(tree->lit_root,
1786                                          filter_intent_cb, &arg);
1787         }
1788         unlock_res(res);
1789
1790         /* There were no PW locks beyond the size in the LVB; finished. */
1791         if (l == NULL) {
1792                 if (only_liblustre) {
1793                         /* If we discovered a liblustre client with a PW lock,
1794                          * however, the LVB may be out of date!  The LVB is
1795                          * updated only on glimpse (which we don't do for
1796                          * liblustre clients) and cancel (which the client
1797                          * obviously has not yet done).  So if it has written
1798                          * data but kept the lock, the LVB is stale and needs
1799                          * to be updated from disk.
1800                          *
1801                          * Of course, this will all disappear when we switch to
1802                          * taking liblustre locks on the OST. */
1803                         ldlm_res_lvbo_update(res, NULL, 1);
1804                 }
1805                 RETURN(ELDLM_LOCK_ABORTED);
1806         }
1807
1808         /*
1809          * This check is for lock taken in filter_prepare_destroy() that does
1810          * not have l_glimpse_ast set. So the logic is: if there is a lock
1811          * with no l_glimpse_ast set, this object is being destroyed already.
1812          *
1813          * Hence, if you are grabbing DLM locks on the server, always set
1814          * non-NULL glimpse_ast (e.g., ldlm_request.c:ldlm_glimpse_ast()).
1815          */
1816         if (l->l_glimpse_ast == NULL) {
1817                 /* We are racing with unlink(); just return -ENOENT */
1818                 rep->lock_policy_res1 = -ENOENT;
1819                 goto out;
1820         }
1821
1822         LASSERTF(l->l_glimpse_ast != NULL, "l == %p", l);
1823         rc = l->l_glimpse_ast(l, NULL); /* this will update the LVB */
1824
1825         lock_res(res);
1826         *reply_lvb = *res_lvb;
1827         unlock_res(res);
1828
1829  out:
1830         LDLM_LOCK_RELEASE(l);
1831
1832         RETURN(ELDLM_LOCK_ABORTED);
1833 }
1834
1835 /*
1836  * per-obd_device iobuf pool.
1837  *
1838  * To avoid memory deadlocks in low-memory setups, amount of dynamic
1839  * allocations in write-path has to be minimized (see bug 5137).
1840  *
1841  * Pages, niobuf_local's and niobuf_remote's are pre-allocated and attached to
1842  * OST threads (see ost_thread_{init,done}()).
1843  *
1844  * "iobuf's" used by filter cannot be attached to OST thread, however, because
1845  * at the OST layer there are only (potentially) multiple obd_device of type
1846  * unknown at the time of OST thread creation.
1847  *
1848  * We create a cfs_hash for struct filter_obd (->fo_iobuf_hash field) on
1849  * initializing, each OST thread will create it's own iobuf on the first
1850  * access and insert it into ->fo_iobuf_hash with thread ID as key,
1851  * so the iobuf can be found again by thread ID.
1852  *
1853  * Functions below
1854  *
1855  *     filter_iobuf_pool_init()
1856  *
1857  *     filter_iobuf_pool_done()
1858  *
1859  *     filter_iobuf_get()
1860  *
1861  * operate on this array. They are "generic" in a sense that they don't depend
1862  * on actual type of iobuf's (the latter depending on Linux kernel version).
1863  */
1864
1865 /*
1866  * destroy pool created by filter_iobuf_pool_init
1867  */
1868 static void filter_iobuf_pool_done(struct filter_obd *filter)
1869 {
1870         ENTRY;
1871
1872         if (filter->fo_iobuf_hash != NULL) {
1873                 cfs_hash_putref(filter->fo_iobuf_hash);
1874                 filter->fo_iobuf_hash = NULL;
1875         }
1876         EXIT;
1877 }
1878
1879 static int filter_adapt_sptlrpc_conf(struct obd_device *obd, int initial)
1880 {
1881         struct filter_obd       *filter = &obd->u.filter;
1882         struct sptlrpc_rule_set  tmp_rset;
1883         int                      rc;
1884
1885         sptlrpc_rule_set_init(&tmp_rset);
1886         rc = sptlrpc_conf_target_get_rules(obd, &tmp_rset, initial);
1887         if (rc) {
1888                 CERROR("obd %s: failed get sptlrpc rules: %d\n",
1889                        obd->obd_name, rc);
1890                 return rc;
1891         }
1892
1893         sptlrpc_target_update_exp_flavor(obd, &tmp_rset);
1894
1895         cfs_write_lock(&filter->fo_sptlrpc_lock);
1896         sptlrpc_rule_set_free(&filter->fo_sptlrpc_rset);
1897         filter->fo_sptlrpc_rset = tmp_rset;
1898         cfs_write_unlock(&filter->fo_sptlrpc_lock);
1899
1900         return 0;
1901 }
1902
1903 static unsigned
1904 filter_iobuf_hop_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1905 {
1906         __u64   val = *((__u64 *)key);
1907
1908         return cfs_hash_long(val, hs->hs_cur_bits);
1909 }
1910
1911 static void *
1912 filter_iobuf_hop_key(cfs_hlist_node_t *hnode)
1913 {
1914         struct filter_iobuf     *pool;
1915
1916         pool = cfs_hlist_entry(hnode, struct filter_iobuf, dr_hlist);
1917         return &pool->dr_hkey;
1918 }
1919
1920 static int
1921 filter_iobuf_hop_keycmp(const void *key, cfs_hlist_node_t *hnode)
1922 {
1923         struct filter_iobuf     *pool;
1924
1925         pool = cfs_hlist_entry(hnode, struct filter_iobuf, dr_hlist);
1926         return pool->dr_hkey == *((__u64 *)key);
1927 }
1928
1929 static void *
1930 filter_iobuf_hop_object(cfs_hlist_node_t *hnode)
1931 {
1932         return cfs_hlist_entry(hnode, struct filter_iobuf, dr_hlist);
1933 }
1934
1935 static void
1936 filter_iobuf_hop_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1937 {
1938         /* dummy, required by cfs_hash */
1939 }
1940
1941 static void
1942 filter_iobuf_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1943 {
1944         /* dummy, required by cfs_hash */
1945 }
1946
1947 static void
1948 filter_iobuf_hop_exit(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1949 {
1950         struct filter_iobuf     *pool;
1951
1952         pool = cfs_hlist_entry(hnode, struct filter_iobuf, dr_hlist);
1953         filter_free_iobuf(pool);
1954 }
1955
1956 static struct cfs_hash_ops filter_iobuf_hops = {
1957         .hs_hash        = filter_iobuf_hop_hash,
1958         .hs_key         = filter_iobuf_hop_key,
1959         .hs_keycmp      = filter_iobuf_hop_keycmp,
1960         .hs_object      = filter_iobuf_hop_object,
1961         .hs_get         = filter_iobuf_hop_get,
1962         .hs_put_locked  = filter_iobuf_hop_put_locked,
1963         .hs_exit        = filter_iobuf_hop_exit
1964 };
1965
1966 #define FILTER_IOBUF_HASH_BITS  9
1967 #define FILTER_IOBUF_HBKT_BITS  4
1968
1969 /*
1970  * pre-allocate pool of iobuf's to be used by filter_{prep,commit}rw_write().
1971  */
1972 static int filter_iobuf_pool_init(struct filter_obd *filter)
1973 {
1974         filter->fo_iobuf_hash = cfs_hash_create("filter_iobuf",
1975                                                 FILTER_IOBUF_HASH_BITS,
1976                                                 FILTER_IOBUF_HASH_BITS,
1977                                                 FILTER_IOBUF_HBKT_BITS, 0,
1978                                                 CFS_HASH_MIN_THETA,
1979                                                 CFS_HASH_MAX_THETA,
1980                                                 &filter_iobuf_hops,
1981                                                 CFS_HASH_RW_BKTLOCK |
1982                                                 CFS_HASH_NO_ITEMREF);
1983
1984         return filter->fo_iobuf_hash != NULL ? 0 : -ENOMEM;
1985 }
1986
1987 /* Return iobuf allocated for @thread_id.
1988  * If we haven't allocated a pool entry for this thread before, do so now and
1989  * insert it into fo_iobuf_hash, otherwise we can find it from fo_iobuf_hash */
1990 void *filter_iobuf_get(struct filter_obd *filter, struct obd_trans_info *oti)
1991 {
1992         struct filter_iobuf     *pool = NULL;
1993         __u64                   key = 0;
1994         int                     thread_id;
1995         int                     rc;
1996
1997         thread_id = (oti && oti->oti_thread) ? oti->oti_thread->t_id : -1;
1998         if (thread_id >= 0) {
1999                 struct ptlrpc_service_part *svcpt;
2000
2001                 svcpt = oti->oti_thread->t_svcpt;
2002                 LASSERT(svcpt != NULL);
2003
2004                 key = (__u64)(svcpt->scp_cpt) << 32 | thread_id;
2005                 pool = cfs_hash_lookup(filter->fo_iobuf_hash, &key);
2006                 if (pool != NULL)
2007                         return pool;
2008         }
2009
2010         pool = filter_alloc_iobuf(filter, OBD_BRW_WRITE, PTLRPC_MAX_BRW_PAGES);
2011         if (pool == NULL)
2012                 return NULL;
2013
2014         if (thread_id >= 0) {
2015                 pool->dr_hkey = key;
2016                 rc = cfs_hash_add_unique(filter->fo_iobuf_hash,
2017                                          &key, &pool->dr_hlist);
2018                 /* ptlrpc service thould guarantee thread ID is unique */
2019                 LASSERT(rc != -EALREADY);
2020         }
2021
2022         return pool;
2023 }
2024
2025 /* mount the file system (secretly).  lustre_cfg parameters are:
2026  * 1 = device
2027  * 2 = fstype
2028  * 3 = flags: failover=f, failout=n
2029  * 4 = mount options
2030  */
2031 int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
2032                         void *option)
2033 {
2034         struct filter_obd *filter = &obd->u.filter;
2035         struct vfsmount *mnt;
2036         struct file_system_type *type;
2037         struct lustre_mount_info *lmi;
2038         struct obd_uuid uuid;
2039         __u8 *uuid_ptr;
2040         char *str, *label;
2041         char ns_name[48];
2042         struct request_queue *q;
2043         int rc, i;
2044         ENTRY;
2045
2046         if (lcfg->lcfg_bufcount < 3 ||
2047             LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
2048             LUSTRE_CFG_BUFLEN(lcfg, 2) < 1)
2049                 RETURN(-EINVAL);
2050
2051         lmi = server_get_mount(obd->obd_name);
2052         if (lmi) {
2053                 /* We already mounted in lustre_fill_super.
2054                    lcfg bufs 1, 2, 4 (device, fstype, mount opts) are ignored.*/
2055                 struct lustre_sb_info *lsi = s2lsi(lmi->lmi_sb);
2056                 mnt = lmi->lmi_mnt;
2057                 obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
2058         } else {
2059                 /* old path - used by lctl */
2060                 CERROR("Using old MDS mount method\n");
2061                 type = get_fs_type(lustre_cfg_string(lcfg, 2));
2062                 if (!type) {
2063                         CERROR("get_fs_type failed\n");
2064                         RETURN(-ENODEV);
2065                 }
2066                 mnt = vfs_kern_mount(type, MS_NOATIME|MS_NODIRATIME,
2067                                      lustre_cfg_string(lcfg, 1), option);
2068                 cfs_module_put(type->owner);
2069                 if (IS_ERR(mnt)) {
2070                         rc = PTR_ERR(mnt);
2071                         LCONSOLE_ERROR_MSG(0x135, "Can't mount disk %s (%d)\n",
2072                                            lustre_cfg_string(lcfg, 1), rc);
2073                         RETURN(rc);
2074                 }
2075
2076                 obd->obd_fsops = fsfilt_get_ops(lustre_cfg_string(lcfg, 2));
2077         }
2078         if (IS_ERR(obd->obd_fsops))
2079                 GOTO(err_mntput, rc = PTR_ERR(obd->obd_fsops));
2080
2081         rc = filter_iobuf_pool_init(filter);
2082         if (rc != 0)
2083                 GOTO(err_ops, rc);
2084
2085         if (lvfs_check_rdonly(lvfs_sbdev(mnt->mnt_sb))) {
2086                 CERROR("%s: Underlying device is marked as read-only. "
2087                        "Setup failed\n", obd->obd_name);
2088                 GOTO(err_ops, rc = -EROFS);
2089         }
2090
2091         /* failover is the default */
2092         obd->obd_replayable = 1;
2093
2094         /* disable connection until configuration finishes */
2095         obd->obd_no_conn = 1;
2096
2097         if (lcfg->lcfg_bufcount > 3 && LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
2098                 str = lustre_cfg_string(lcfg, 3);
2099                 if (strchr(str, 'n')) {
2100                         CWARN("%s: recovery disabled\n", obd->obd_name);
2101                         obd->obd_replayable = 0;
2102                 }
2103         }
2104
2105         obd->u.obt.obt_magic = OBT_MAGIC;
2106         obd->u.obt.obt_vfsmnt = mnt;
2107         obd->u.obt.obt_sb = mnt->mnt_sb;
2108         filter->fo_fstype = mnt->mnt_sb->s_type->name;
2109         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
2110
2111         rc = fsfilt_setup(obd, obd->u.obt.obt_sb);
2112         if (rc)
2113                 GOTO(err_ops, rc);
2114
2115         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
2116         obd->obd_lvfs_ctxt.pwdmnt = mnt;
2117         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
2118         obd->obd_lvfs_ctxt.fs = get_ds();
2119         obd->obd_lvfs_ctxt.cb_ops = filter_lvfs_ops;
2120
2121         cfs_mutex_init(&filter->fo_init_lock);
2122         filter->fo_committed_group = 0;
2123         filter->fo_destroys_in_progress = 0;
2124         for (i = 0; i < 32; i++)
2125                 cfs_mutex_init(&filter->fo_create_locks[i]);
2126
2127         cfs_spin_lock_init(&filter->fo_objidlock);
2128         CFS_INIT_LIST_HEAD(&filter->fo_export_list);
2129         cfs_mutex_init(&filter->fo_alloc_lock);
2130         init_brw_stats(&filter->fo_filter_stats);
2131         cfs_spin_lock_init(&filter->fo_flags_lock);
2132         filter->fo_read_cache = 1; /* enable read-only cache by default */
2133         filter->fo_writethrough_cache = 1; /* enable writethrough cache */
2134         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
2135         filter->fo_fmd_max_num = FILTER_FMD_MAX_NUM_DEFAULT;
2136         filter->fo_fmd_max_age = FILTER_FMD_MAX_AGE_DEFAULT;
2137         filter->fo_syncjournal = 0; /* Don't sync journals on i/o by default */
2138         filter_slc_set(filter); /* initialize sync on lock cancel */
2139
2140         rc = filter_prep(obd);
2141         if (rc)
2142                 GOTO(err_ops, rc);
2143
2144         CFS_INIT_LIST_HEAD(&filter->fo_llog_list);
2145         cfs_spin_lock_init(&filter->fo_llog_list_lock);
2146
2147         filter->fo_fl_oss_capa = 1;
2148
2149         CFS_INIT_LIST_HEAD(&filter->fo_capa_keys);
2150         filter->fo_capa_hash = init_capa_hash();
2151         if (filter->fo_capa_hash == NULL)
2152                 GOTO(err_post, rc = -ENOMEM);
2153
2154         sprintf(ns_name, "filter-%s", obd->obd_uuid.uuid);
2155         obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
2156                                                 LDLM_NAMESPACE_SERVER,
2157                                                 LDLM_NAMESPACE_GREEDY,
2158                                                 LDLM_NS_TYPE_OST);
2159         if (obd->obd_namespace == NULL)
2160                 GOTO(err_post, rc = -ENOMEM);
2161         obd->obd_namespace->ns_lvbp = obd;
2162         obd->obd_namespace->ns_lvbo = &filter_lvbo;
2163         ldlm_register_intent(obd->obd_namespace, filter_intent_policy);
2164
2165         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
2166                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
2167
2168         rc = obd_llog_init(obd, &obd->obd_olg, obd, NULL);
2169         if (rc) {
2170                 CERROR("failed to setup llogging subsystems\n");
2171                 GOTO(err_post, rc);
2172         }
2173
2174         cfs_rwlock_init(&filter->fo_sptlrpc_lock);
2175         sptlrpc_rule_set_init(&filter->fo_sptlrpc_rset);
2176         /* do this after llog being initialized */
2177         filter_adapt_sptlrpc_conf(obd, 1);
2178
2179         rc = lquota_setup(filter_quota_interface_ref, obd);
2180         if (rc)
2181                 GOTO(err_post, rc);
2182
2183         q = bdev_get_queue(mnt->mnt_sb->s_bdev);
2184         if (queue_max_sectors(q) < queue_max_hw_sectors(q) &&
2185             queue_max_sectors(q) < PTLRPC_MAX_BRW_SIZE >> 9)
2186                 LCONSOLE_INFO("%s: underlying device %s should be tuned "
2187                               "for larger I/O requests: max_sectors = %u "
2188                               "could be up to max_hw_sectors=%u\n",
2189                               obd->obd_name, mnt->mnt_sb->s_id,
2190                               queue_max_sectors(q), queue_max_hw_sectors(q));
2191
2192         uuid_ptr = fsfilt_uuid(obd, obd->u.obt.obt_sb);
2193         if (uuid_ptr != NULL) {
2194                 class_uuid_unparse(uuid_ptr, &uuid);
2195                 str = uuid.uuid;
2196         } else {
2197                 str = "no UUID";
2198         }
2199
2200         label = fsfilt_get_label(obd, obd->u.obt.obt_sb);
2201         LCONSOLE_INFO("%s: Now serving %s %s%s with recovery %s\n",
2202                       obd->obd_name, label ?: str, lmi ? "on " : "",
2203                       lmi ? s2lsi(lmi->lmi_sb)->lsi_lmd->lmd_dev : "",
2204                       obd->obd_replayable ? "enabled" : "disabled");
2205
2206         RETURN(0);
2207
2208 err_post:
2209         filter_post(obd);
2210 err_ops:
2211         fsfilt_put_ops(obd->obd_fsops);
2212         filter_iobuf_pool_done(filter);
2213 err_mntput:
2214         server_put_mount(obd->obd_name, mnt);
2215         obd->u.obt.obt_sb = 0;
2216         return rc;
2217 }
2218
2219 static int filter_setup(struct obd_device *obd, struct lustre_cfg* lcfg)
2220 {
2221         struct lprocfs_static_vars lvars;
2222         cfs_proc_dir_entry_t *entry;
2223         unsigned long addr;
2224         struct page *page;
2225         int rc;
2226         ENTRY;
2227
2228         CLASSERT(offsetof(struct obd_device, u.obt) ==
2229                  offsetof(struct obd_device, u.filter.fo_obt));
2230
2231         if (!LUSTRE_CFG_BUFLEN(lcfg, 1) || !LUSTRE_CFG_BUFLEN(lcfg, 2))
2232                 RETURN(-EINVAL);
2233
2234         /* lprocfs must be setup before the filter so state can be safely added
2235          * to /proc incrementally as the filter is setup */
2236         lprocfs_filter_init_vars(&lvars);
2237         rc = lprocfs_obd_setup(obd, lvars.obd_vars);
2238         if (rc) {
2239                 CERROR("%s: lprocfs_obd_setup failed: %d.\n",
2240                        obd->obd_name, rc);
2241                 RETURN(rc);
2242         }
2243
2244         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
2245         if (rc) {
2246                 CERROR("%s: lprocfs_alloc_obd_stats failed: %d.\n",
2247                        obd->obd_name, rc);
2248                 GOTO(obd_cleanup, rc);
2249         }
2250
2251         /* Init obdfilter private stats here */
2252         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
2253                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
2254         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
2255                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
2256         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_GET_PAGE,
2257                              LPROCFS_CNTR_AVGMINMAX|LPROCFS_CNTR_STDDEV,
2258                              "get_page", "usec");
2259         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_NO_PAGE,
2260                              LPROCFS_CNTR_AVGMINMAX, "get_page_failures", "num");
2261         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_ACCESS,
2262                              LPROCFS_CNTR_AVGMINMAX, "cache_access", "pages");
2263         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_HIT,
2264                              LPROCFS_CNTR_AVGMINMAX, "cache_hit", "pages");
2265         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_MISS,
2266                              LPROCFS_CNTR_AVGMINMAX, "cache_miss", "pages");
2267
2268         rc = lproc_filter_attach_seqstat(obd);
2269         if (rc) {
2270                 CERROR("%s: create seqstat failed: %d.\n", obd->obd_name, rc);
2271                 GOTO(free_obd_stats, rc);
2272         }
2273
2274         entry = lprocfs_register("exports", obd->obd_proc_entry, NULL, NULL);
2275         if (IS_ERR(entry)) {
2276                 rc = PTR_ERR(entry);
2277                 CERROR("%s: error %d setting up lprocfs for %s\n",
2278                        obd->obd_name, rc, "exports");
2279                 GOTO(free_obd_stats, rc);
2280         }
2281         obd->obd_proc_exports_entry = entry;
2282
2283         entry = lprocfs_add_simple(obd->obd_proc_exports_entry, "clear",
2284                                    lprocfs_nid_stats_clear_read,
2285                                    lprocfs_nid_stats_clear_write, obd, NULL);
2286         if (IS_ERR(entry)) {
2287                 rc = PTR_ERR(entry);
2288                 CERROR("%s: add proc entry 'clear' failed: %d.\n",
2289                        obd->obd_name, rc);
2290                 GOTO(free_obd_stats, rc);
2291         }
2292
2293         rc = lprocfs_job_stats_init(obd, LPROC_FILTER_STATS_LAST,
2294                                     filter_stats_counter_init);
2295         if (rc)
2296                 GOTO(remove_entry_clear, rc);
2297
2298         /* 2.6.9 selinux wants a full option page for do_kern_mount (bug6471) */
2299         OBD_PAGE_ALLOC(page, CFS_ALLOC_STD);
2300         if (!page)
2301                 GOTO(job_stats_fini, rc = -ENOMEM);
2302         addr = (unsigned long)cfs_page_address(page);
2303         clear_page((void *)addr);
2304         memcpy((void *)addr, lustre_cfg_buf(lcfg, 4),
2305                LUSTRE_CFG_BUFLEN(lcfg, 4));
2306         rc = filter_common_setup(obd, lcfg, (void *)addr);
2307         OBD_PAGE_FREE(page);
2308         if (rc) {
2309                 CERROR("%s: filter_common_setup failed: %d.\n",
2310                        obd->obd_name, rc);
2311                 GOTO(job_stats_fini, rc);
2312         }
2313
2314         RETURN(0);
2315
2316 job_stats_fini:
2317         lprocfs_job_stats_fini(obd);
2318 remove_entry_clear:
2319         lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
2320 free_obd_stats:
2321         lprocfs_free_obd_stats(obd);
2322 obd_cleanup:
2323         lprocfs_obd_cleanup(obd);
2324         return rc;
2325 }
2326
2327 static struct llog_operations filter_mds_ost_repl_logops;
2328
2329 static struct llog_operations filter_size_orig_logops = {
2330         .lop_setup   = llog_obd_origin_setup,
2331         .lop_cleanup = llog_obd_origin_cleanup,
2332         .lop_add     = llog_obd_origin_add
2333 };
2334
2335 static int filter_olg_fini(struct obd_llog_group *olg)
2336 {
2337         struct llog_ctxt *ctxt;
2338         int rc = 0, rc2 = 0;
2339         ENTRY;
2340
2341         ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
2342         if (ctxt)
2343                 rc = llog_cleanup(ctxt);
2344
2345         ctxt = llog_group_get_ctxt(olg, LLOG_SIZE_ORIG_CTXT);
2346         if (ctxt) {
2347                 rc2 = llog_cleanup(ctxt);
2348                 if (!rc)
2349                         rc = rc2;
2350         }
2351
2352         ctxt = llog_group_get_ctxt(olg, LLOG_CONFIG_ORIG_CTXT);
2353         if (ctxt) {
2354                 rc2 = llog_cleanup(ctxt);
2355                 if (!rc)
2356                         rc = rc2;
2357         }
2358
2359         RETURN(rc);
2360 }
2361
2362 static int
2363 filter_olg_init(struct obd_device *obd, struct obd_llog_group *olg,
2364                 struct obd_device *tgt)
2365 {
2366         int rc;
2367         ENTRY;
2368
2369         rc = llog_setup(obd, olg, LLOG_MDS_OST_REPL_CTXT, tgt, 0, NULL,
2370                         &filter_mds_ost_repl_logops);
2371         if (rc)
2372                 GOTO(cleanup, rc);
2373
2374         rc = llog_setup(obd, olg, LLOG_SIZE_ORIG_CTXT, tgt, 0, NULL,
2375                         &filter_size_orig_logops);
2376         if (rc)
2377                 GOTO(cleanup, rc);
2378         EXIT;
2379 cleanup:
2380         if (rc)
2381                 filter_olg_fini(olg);
2382         return rc;
2383 }
2384
2385 /**
2386  * Init the default olg, which is embeded in the obd_device, for filter.
2387  */
2388 static int
2389 filter_default_olg_init(struct obd_device *obd, struct obd_llog_group *olg,
2390                         struct obd_device *tgt)
2391 {
2392         struct filter_obd *filter = &obd->u.filter;
2393         struct llog_ctxt *ctxt;
2394         int rc;
2395         ENTRY;
2396
2397         filter->fo_lcm = llog_recov_thread_init(obd->obd_name);
2398         if (!filter->fo_lcm)
2399                 RETURN(-ENOMEM);
2400
2401         filter_mds_ost_repl_logops = llog_client_ops;
2402         filter_mds_ost_repl_logops.lop_cancel = llog_obd_repl_cancel;
2403         filter_mds_ost_repl_logops.lop_connect = llog_obd_repl_connect;
2404         filter_mds_ost_repl_logops.lop_sync = llog_obd_repl_sync;
2405
2406         rc = filter_olg_init(obd, olg, tgt);
2407         if (rc)
2408                 GOTO(cleanup_lcm, rc);
2409
2410         rc = llog_setup(obd, olg, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
2411                         &llog_lvfs_ops);
2412         if (rc)
2413                 GOTO(cleanup_olg, rc);
2414
2415         ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
2416         if (!ctxt) {
2417                 CERROR("Can't get ctxt for %p:%x\n", olg,
2418                        LLOG_MDS_OST_REPL_CTXT);
2419                 GOTO(cleanup_olg, rc = -ENODEV);
2420         }
2421         ctxt->loc_lcm = lcm_get(filter->fo_lcm);
2422         ctxt->llog_proc_cb = filter_recov_log_mds_ost_cb;
2423         llog_ctxt_put(ctxt);
2424
2425         RETURN(0);
2426 cleanup_olg:
2427         filter_olg_fini(olg);
2428 cleanup_lcm:
2429         llog_recov_thread_fini(filter->fo_lcm, 1);
2430         filter->fo_lcm = NULL;
2431         return rc;
2432 }
2433
2434 static int
2435 filter_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
2436                  struct obd_device *tgt, int *index)
2437 {
2438         struct filter_obd *filter = &obd->u.filter;
2439         struct llog_ctxt *ctxt;
2440         int rc;
2441         ENTRY;
2442
2443         LASSERT(olg != NULL);
2444         if (olg == &obd->obd_olg)
2445                 return filter_default_olg_init(obd, olg, tgt);
2446
2447         LASSERT(filter->fo_lcm != NULL);
2448         rc = filter_olg_init(obd, olg, tgt);
2449         if (rc)
2450                 RETURN(rc);
2451         ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
2452         if (!ctxt) {
2453                 CERROR("Can't get ctxt for %p:%x\n", olg,
2454                        LLOG_MDS_OST_REPL_CTXT);
2455                 filter_olg_fini(olg);
2456                 RETURN(-ENODEV);
2457         }
2458         ctxt->llog_proc_cb = filter_recov_log_mds_ost_cb;
2459         ctxt->loc_lcm = lcm_get(filter->fo_lcm);
2460         llog_ctxt_put(ctxt);
2461         RETURN(rc);
2462 }
2463
2464 static int filter_llog_finish(struct obd_device *obd, int count)
2465 {
2466         struct filter_obd *filter = &obd->u.filter;
2467         struct llog_ctxt *ctxt;
2468         ENTRY;
2469
2470         ctxt = llog_group_get_ctxt(&obd->obd_olg, LLOG_MDS_OST_REPL_CTXT);
2471         if (ctxt) {
2472                 /*
2473                  * Make sure that no cached llcds left in recov_thread.
2474                  * We actually do sync in disconnect time, but disconnect
2475                  * may not come being marked rq_no_resend = 1.
2476                  */
2477                 llog_sync(ctxt, NULL, OBD_LLOG_FL_EXIT);
2478
2479                 /*
2480                  * Balance class_import_get() in llog_receptor_accept().
2481                  * This is safe to do, as llog is already synchronized
2482                  * and its import may go.
2483                  */
2484                 cfs_mutex_lock(&ctxt->loc_mutex);
2485                 if (ctxt->loc_imp) {
2486                         class_import_put(ctxt->loc_imp);
2487                         ctxt->loc_imp = NULL;
2488                 }
2489
2490                 if (filter->fo_lcm) {
2491                         llog_recov_thread_fini(filter->fo_lcm, obd->obd_force);
2492                         filter->fo_lcm = NULL;
2493                 }
2494
2495                 cfs_mutex_unlock(&ctxt->loc_mutex);
2496                 llog_ctxt_put(ctxt);
2497         }
2498
2499         RETURN(filter_olg_fini(&obd->obd_olg));
2500 }
2501
2502 /**
2503  * Find the group llog according to group index in the llog group list.
2504  */
2505 static struct obd_llog_group *
2506 filter_find_olg_internal(struct filter_obd *filter, int group)
2507 {
2508         struct obd_llog_group *olg;
2509
2510         LASSERT_SPIN_LOCKED(&filter->fo_llog_list_lock);
2511         cfs_list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
2512                 if (olg->olg_seq == group)
2513                         RETURN(olg);
2514         }
2515         RETURN(NULL);
2516 }
2517
2518 /**
2519  * Find the group llog according to group index on the filter
2520  */
2521 struct obd_llog_group *filter_find_olg(struct obd_device *obd, int group)
2522 {
2523         struct obd_llog_group *olg = NULL;
2524         struct filter_obd *filter;
2525
2526         filter = &obd->u.filter;
2527
2528         if (group == FID_SEQ_LLOG)
2529                 RETURN(&obd->obd_olg);
2530
2531         cfs_spin_lock(&filter->fo_llog_list_lock);
2532         olg = filter_find_olg_internal(filter, group);
2533         cfs_spin_unlock(&filter->fo_llog_list_lock);
2534
2535         RETURN(olg);
2536 }
2537 /**
2538  * Find the llog_group of the filter according to the group. If it can not
2539  * find, create the llog_group, which only happens when mds is being synced
2540  * with OST.
2541  */
2542 struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
2543 {
2544         struct obd_llog_group *olg = NULL, *olg_new = NULL;
2545         struct filter_obd *filter;
2546         int rc;
2547
2548         filter = &obd->u.filter;
2549
2550         if (group == FID_SEQ_LLOG)
2551                 RETURN(&obd->obd_olg);
2552
2553         OBD_ALLOC_PTR(olg_new);
2554         if (olg_new == NULL)
2555                RETURN(ERR_PTR(-ENOMEM));
2556
2557         cfs_spin_lock(&filter->fo_llog_list_lock);
2558         olg = filter_find_olg_internal(filter, group);
2559         if (olg) {
2560                 if (olg->olg_initializing) {
2561                         GOTO(out_unlock, olg = ERR_PTR(-EBUSY));
2562                 } else {
2563                         GOTO(out_unlock, olg);
2564                 }
2565         } else {
2566                 /* set as the newly allocated one */
2567                 olg = olg_new;
2568                 olg_new = NULL;
2569         }
2570
2571         llog_group_init(olg, group);
2572         cfs_list_add(&olg->olg_list, &filter->fo_llog_list);
2573         olg->olg_initializing = 1;
2574         cfs_spin_unlock(&filter->fo_llog_list_lock);
2575
2576         rc = obd_llog_init(obd, olg, obd, NULL);
2577         if (rc) {
2578                cfs_spin_lock(&filter->fo_llog_list_lock);
2579                cfs_list_del(&olg->olg_list);
2580                cfs_spin_unlock(&filter->fo_llog_list_lock);
2581                OBD_FREE_PTR(olg);
2582                GOTO(out, olg = ERR_PTR(-ENOMEM));
2583         }
2584         cfs_spin_lock(&filter->fo_llog_list_lock);
2585         olg->olg_initializing = 0;
2586         cfs_spin_unlock(&filter->fo_llog_list_lock);
2587         CDEBUG(D_OTHER, "%s: new llog group %u (0x%p)\n",
2588               obd->obd_name, group, olg);
2589 out:
2590         RETURN(olg);
2591
2592 out_unlock:
2593         cfs_spin_unlock(&filter->fo_llog_list_lock);
2594         if (olg_new)
2595                OBD_FREE_PTR(olg_new);
2596         goto out;
2597 }
2598
2599 static int filter_llog_connect(struct obd_export *exp,
2600                                struct llogd_conn_body *body)
2601 {
2602         struct obd_device *obd = exp->exp_obd;
2603         struct llog_ctxt *ctxt;
2604         struct obd_llog_group *olg;
2605         int rc;
2606         ENTRY;
2607
2608         CDEBUG(D_OTHER, "%s: LLog connect for: "LPX64"/"LPX64":%x\n",
2609                obd->obd_name, body->lgdc_logid.lgl_oid,
2610                body->lgdc_logid.lgl_oseq, body->lgdc_logid.lgl_ogen);
2611
2612         olg = filter_find_olg(obd, body->lgdc_logid.lgl_oseq);
2613         if (!olg) {
2614                 CERROR(" %s: can not find olg of group %d\n",
2615                        obd->obd_name, (int)body->lgdc_logid.lgl_oseq);
2616                 RETURN(-ENOENT);
2617         }
2618         llog_group_set_export(olg, exp);
2619
2620         ctxt = llog_group_get_ctxt(olg, body->lgdc_ctxt_idx);
2621         LASSERTF(ctxt != NULL, "ctxt is not null, ctxt idx %d \n",
2622                  body->lgdc_ctxt_idx);
2623
2624         CDEBUG(D_HA, "%s: Recovery from log "LPX64"/"LPX64":%x\n",
2625                obd->obd_name, body->lgdc_logid.lgl_oid,
2626                body->lgdc_logid.lgl_oseq, body->lgdc_logid.lgl_ogen);
2627
2628         cfs_spin_lock(&obd->u.filter.fo_flags_lock);
2629         obd->u.filter.fo_mds_ost_sync = 1;
2630         cfs_spin_unlock(&obd->u.filter.fo_flags_lock);
2631         rc = llog_connect(ctxt, &body->lgdc_logid,
2632                           &body->lgdc_gen, NULL);
2633         llog_ctxt_put(ctxt);
2634         if (rc != 0)
2635                 CERROR("failed to connect rc %d idx %d\n", rc,
2636                                 body->lgdc_ctxt_idx);
2637
2638         RETURN(rc);
2639 }
2640
2641 static int filter_llog_preclean(struct obd_device *obd)
2642 {
2643         struct obd_llog_group *olg, *tmp;
2644         struct filter_obd *filter;
2645         cfs_list_t  remove_list;
2646         int rc = 0;
2647         ENTRY;
2648
2649         rc = obd_llog_finish(obd, 0);
2650         if (rc)
2651                 CERROR("failed to cleanup llogging subsystem\n");
2652
2653         filter = &obd->u.filter;
2654         CFS_INIT_LIST_HEAD(&remove_list);
2655
2656         cfs_spin_lock(&filter->fo_llog_list_lock);
2657         while (!cfs_list_empty(&filter->fo_llog_list)) {
2658                 olg = cfs_list_entry(filter->fo_llog_list.next,
2659                                      struct obd_llog_group, olg_list);
2660                 cfs_list_del(&olg->olg_list);
2661                 cfs_list_add(&olg->olg_list, &remove_list);
2662         }
2663         cfs_spin_unlock(&filter->fo_llog_list_lock);
2664
2665         cfs_list_for_each_entry_safe(olg, tmp, &remove_list, olg_list) {
2666                 cfs_list_del_init(&olg->olg_list);
2667                 rc = filter_olg_fini(olg);
2668                 if (rc)
2669                         CERROR("failed to cleanup llogging subsystem for %u\n",
2670                                olg->olg_seq);
2671                 OBD_FREE_PTR(olg);
2672         }
2673
2674         RETURN(rc);
2675 }
2676
2677 static int filter_precleanup(struct obd_device *obd,
2678                              enum obd_cleanup_stage stage)
2679 {
2680         int rc = 0;
2681         ENTRY;
2682
2683         switch(stage) {
2684         case OBD_CLEANUP_EARLY:
2685                 break;
2686         case OBD_CLEANUP_EXPORTS:
2687                 /* Stop recovery before namespace cleanup. */
2688                 target_recovery_fini(obd);
2689
2690                 obd_exports_barrier(obd);
2691                 obd_zombie_barrier();
2692
2693                 rc = filter_llog_preclean(obd);
2694                 lprocfs_job_stats_fini(obd);
2695                 lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
2696                 lprocfs_free_per_client_stats(obd);
2697                 lprocfs_obd_cleanup(obd);
2698                 lprocfs_free_obd_stats(obd);
2699                 lquota_cleanup(filter_quota_interface_ref, obd);
2700                 break;
2701         }
2702         RETURN(rc);
2703 }
2704
2705 static int filter_cleanup(struct obd_device *obd)
2706 {
2707         struct filter_obd *filter = &obd->u.filter;
2708         ENTRY;
2709
2710         if (obd->obd_fail)
2711                 LCONSOLE_WARN("%s: shutting down for failover; client state "
2712                               "will be preserved.\n", obd->obd_name);
2713
2714         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
2715         obd->obd_namespace = NULL;
2716
2717         sptlrpc_rule_set_free(&filter->fo_sptlrpc_rset);
2718
2719         if (obd->u.obt.obt_sb == NULL)
2720                 RETURN(0);
2721
2722         filter_post(obd);
2723
2724         ll_vfs_dq_off(obd->u.obt.obt_sb, 0);
2725         shrink_dcache_sb(obd->u.obt.obt_sb);
2726
2727         server_put_mount(obd->obd_name, obd->u.obt.obt_vfsmnt);
2728         obd->u.obt.obt_sb = NULL;
2729
2730         fsfilt_put_ops(obd->obd_fsops);
2731
2732         filter_iobuf_pool_done(filter);
2733
2734         LCONSOLE_INFO("OST %s has stopped.\n", obd->obd_name);
2735
2736         RETURN(0);
2737 }
2738
2739 static int filter_connect_internal(struct obd_export *exp,
2740                                    struct obd_connect_data *data,
2741                                    int reconnect)
2742 {
2743         struct filter_export_data *fed = &exp->exp_filter_data;
2744
2745         if (!data)
2746                 RETURN(0);
2747
2748         CDEBUG(D_RPCTRACE, "%s: cli %s/%p ocd_connect_flags: "LPX64
2749                " ocd_version: %x ocd_grant: %d ocd_index: %u\n",
2750                exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
2751                data->ocd_connect_flags, data->ocd_version,
2752                data->ocd_grant, data->ocd_index);
2753
2754         if (fed->fed_group != 0 && fed->fed_group != data->ocd_group) {
2755                 CWARN("!!! This export (nid %s) used object group %d "
2756                        "earlier; now it's trying to use group %d!  This could "
2757                        "be a bug in the MDS. Please report to "
2758                        "http://bugs.whamcloud.com/\n",
2759                        obd_export_nid2str(exp), fed->fed_group,data->ocd_group);
2760                 RETURN(-EPROTO);
2761         }
2762         fed->fed_group = data->ocd_group;
2763
2764         data->ocd_connect_flags &= OST_CONNECT_SUPPORTED;
2765         exp->exp_connect_flags = data->ocd_connect_flags;
2766         data->ocd_version = LUSTRE_VERSION_CODE;
2767
2768         /* Kindly make sure the SKIP_ORPHAN flag is from MDS. */
2769         if (data->ocd_connect_flags & OBD_CONNECT_MDS)
2770                 CDEBUG(D_HA, "%s: Received MDS connection for group %u\n",
2771                        exp->exp_obd->obd_name, data->ocd_group);
2772         else if (data->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN)
2773                 RETURN(-EPROTO);
2774
2775         if (exp->exp_connect_flags & OBD_CONNECT_GRANT) {
2776                 struct filter_obd *filter = &exp->exp_obd->u.filter;
2777                 obd_size left, want;
2778
2779                 cfs_spin_lock(&exp->exp_obd->obd_osfs_lock);
2780                 left = filter_grant_space_left(exp);
2781                 want = data->ocd_grant;
2782                 filter_grant(exp, fed->fed_grant, want, left, (reconnect == 0));
2783                 data->ocd_grant = fed->fed_grant;
2784                 cfs_spin_unlock(&exp->exp_obd->obd_osfs_lock);
2785
2786                 CDEBUG(D_CACHE, "%s: cli %s/%p ocd_grant: %d want: "
2787                        LPU64" left: "LPU64"\n", exp->exp_obd->obd_name,
2788                        exp->exp_client_uuid.uuid, exp,
2789                        data->ocd_grant, want, left);
2790
2791                 filter->fo_tot_granted_clients ++;
2792         }
2793
2794         if (data->ocd_connect_flags & OBD_CONNECT_INDEX) {
2795                 struct lr_server_data *lsd = class_server_data(exp->exp_obd);
2796                 int index = le32_to_cpu(lsd->lsd_ost_index);
2797
2798                 if (!(lsd->lsd_feature_compat &
2799                       cpu_to_le32(OBD_COMPAT_OST))) {
2800                         /* this will only happen on the first connect */
2801                         lsd->lsd_ost_index = cpu_to_le32(data->ocd_index);
2802                         lsd->lsd_feature_compat |= cpu_to_le32(OBD_COMPAT_OST);
2803                         /* sync is not needed here as filter_client_add will
2804                          * set exp_need_sync flag */
2805                         filter_update_server_data(exp->exp_obd);
2806                 } else if (index != data->ocd_index) {
2807                         LCONSOLE_ERROR_MSG(0x136, "Connection from %s to index"
2808                                            " %u doesn't match actual OST index"
2809                                            " %u in last_rcvd file, bad "
2810                                            "configuration?\n",
2811                                            obd_export_nid2str(exp), index,
2812                                            data->ocd_index);
2813                         RETURN(-EBADF);
2814                 }
2815                 /* FIXME: Do the same with the MDS UUID and lsd_peeruuid.
2816                  * FIXME: We don't strictly need the COMPAT flag for that,
2817                  * FIXME: as lsd_peeruuid[0] will tell us if that is set.
2818                  * FIXME: We needed it for the index, as index 0 is valid. */
2819         }
2820
2821         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_SIZE)) {
2822                 data->ocd_brw_size = 65536;
2823         } else if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
2824                 data->ocd_brw_size = min(data->ocd_brw_size,
2825                                (__u32)(PTLRPC_MAX_BRW_PAGES << CFS_PAGE_SHIFT));
2826                 if (data->ocd_brw_size == 0) {
2827                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
2828                                " ocd_version: %x ocd_grant: %d ocd_index: %u "
2829                                "ocd_brw_size is unexpectedly zero, "
2830                                "network data corruption?"
2831                                "Refusing connection of this client\n",
2832                                 exp->exp_obd->obd_name,
2833                                 exp->exp_client_uuid.uuid,
2834                                 exp, data->ocd_connect_flags, data->ocd_version,
2835                                 data->ocd_grant, data->ocd_index);
2836                         RETURN(-EPROTO);
2837                 }
2838         }
2839
2840         if (data->ocd_connect_flags & OBD_CONNECT_CKSUM) {
2841                 __u32 cksum_types = data->ocd_cksum_types;
2842
2843                 /* The client set in ocd_cksum_types the checksum types it
2844                  * supports. We have to mask off the algorithms that we don't
2845                  * support */
2846                 data->ocd_cksum_types &= cksum_types_supported_server();
2847
2848                 /* 1.6.4 clients are not supported any more */
2849
2850                 CDEBUG(D_RPCTRACE, "%s: cli %s supports cksum type %x, return "
2851                                    "%x\n", exp->exp_obd->obd_name,
2852                                    obd_export_nid2str(exp), cksum_types,
2853                                    data->ocd_cksum_types);
2854         } else {
2855                 /* This client does not support OBD_CONNECT_CKSUM
2856                  * fall back to CRC32 */
2857                 CDEBUG(D_RPCTRACE, "%s: cli %s does not support "
2858                                    "OBD_CONNECT_CKSUM, CRC32 will be used\n",
2859                                    exp->exp_obd->obd_name,
2860                                    obd_export_nid2str(exp));
2861         }
2862
2863         if (data->ocd_connect_flags & OBD_CONNECT_MAXBYTES)
2864                 data->ocd_maxbytes = exp->exp_obd->u.obt.obt_sb->s_maxbytes;
2865
2866         RETURN(0);
2867 }
2868
2869 static int filter_reconnect(const struct lu_env *env,
2870                             struct obd_export *exp, struct obd_device *obd,
2871                             struct obd_uuid *cluuid,
2872                             struct obd_connect_data *data,
2873                             void *localdata)
2874 {
2875         int rc;
2876         ENTRY;
2877
2878         if (exp == NULL || obd == NULL || cluuid == NULL)
2879                 RETURN(-EINVAL);
2880
2881         rc = filter_connect_internal(exp, data, 1);
2882         if (rc == 0)
2883                 filter_export_stats_init(obd, exp, localdata);
2884
2885         RETURN(rc);
2886 }
2887
2888 static int filter_connect(const struct lu_env *env,
2889                           struct obd_export **exp, struct obd_device *obd,
2890                           struct obd_uuid *cluuid,
2891                           struct obd_connect_data *data, void *localdata)
2892 {
2893         struct lvfs_run_ctxt saved;
2894         struct lustre_handle conn = { 0 };
2895         struct obd_export *lexp;
2896         int rc;
2897         ENTRY;
2898
2899         if (exp == NULL || obd == NULL || cluuid == NULL)
2900                 RETURN(-EINVAL);
2901
2902         rc = class_connect(&conn, obd, cluuid);
2903         if (rc)
2904                 RETURN(rc);
2905         lexp = class_conn2export(&conn);
2906         LASSERT(lexp != NULL);
2907
2908         rc = filter_connect_internal(lexp, data, 0);
2909         if (rc)
2910                 GOTO(cleanup, rc);
2911
2912         filter_export_stats_init(obd, lexp, localdata);
2913         if (obd->obd_replayable) {
2914                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
2915                 LASSERT(lcd);
2916                 memcpy(lcd->lcd_uuid, cluuid, sizeof(lcd->lcd_uuid));
2917                 rc = filter_client_add(obd, lexp, -1);
2918                 if (rc)
2919                         GOTO(cleanup, rc);
2920         }
2921
2922         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2923         rc = filter_read_groups(obd, data->ocd_group, 1);
2924         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2925         if (rc != 0) {
2926                 CERROR("can't read group %u\n", data->ocd_group);
2927                 GOTO(cleanup, rc);
2928         }
2929
2930         GOTO(cleanup, rc);
2931
2932 cleanup:
2933         if (rc) {
2934                 class_disconnect(lexp);
2935                 *exp = NULL;
2936         } else {
2937                 *exp = lexp;
2938         }
2939
2940         RETURN(rc);
2941 }
2942
2943 /* Do extra sanity checks for grant accounting.  We do this at connect,
2944  * disconnect, and statfs RPC time, so it shouldn't be too bad.  We can
2945  * always get rid of it or turn it off when we know accounting is good. */
2946 static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
2947 {
2948         struct filter_export_data *fed;
2949         struct obd_export *exp;
2950         obd_size maxsize = obd->obd_osfs.os_blocks * obd->obd_osfs.os_bsize;
2951         obd_size tot_dirty = 0, tot_pending = 0, tot_granted = 0;
2952         obd_size fo_tot_dirty, fo_tot_pending, fo_tot_granted;
2953
2954         if (cfs_list_empty(&obd->obd_exports))
2955                 return;
2956
2957         /* We don't want to do this for large machines that do lots of
2958            mounts or unmounts.  It burns... */
2959         if (obd->obd_num_exports > 100)
2960                 return;
2961
2962         cfs_spin_lock(&obd->obd_osfs_lock);
2963         cfs_spin_lock(&obd->obd_dev_lock);
2964         cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
2965                 int error = 0;
2966                 fed = &exp->exp_filter_data;
2967                 if (fed->fed_grant < 0 || fed->fed_pending < 0 ||
2968                     fed->fed_dirty < 0)
2969                         error = 1;
2970                 if (maxsize > 0) { /* we may not have done a statfs yet */
2971                         LASSERTF(fed->fed_grant + fed->fed_pending <= maxsize,
2972                                  "%s: cli %s/%p %ld+%ld > "LPU64"\n", func,
2973                                  exp->exp_client_uuid.uuid, exp,
2974                                  fed->fed_grant, fed->fed_pending, maxsize);
2975                         LASSERTF(fed->fed_dirty <= maxsize,
2976                                  "%s: cli %s/%p %ld > "LPU64"\n", func,
2977                                  exp->exp_client_uuid.uuid, exp,
2978                                  fed->fed_dirty, maxsize);
2979                 }
2980                 if (error)
2981                         CERROR("%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
2982                                obd->obd_name, exp->exp_client_uuid.uuid, exp,
2983                                fed->fed_dirty, fed->fed_pending,fed->fed_grant);
2984                 else
2985                         CDEBUG(D_CACHE, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
2986                                obd->obd_name, exp->exp_client_uuid.uuid, exp,
2987                                fed->fed_dirty, fed->fed_pending,fed->fed_grant);
2988                 tot_granted += fed->fed_grant + fed->fed_pending;
2989                 tot_pending += fed->fed_pending;
2990                 tot_dirty += fed->fed_dirty;
2991         }
2992         fo_tot_granted = obd->u.filter.fo_tot_granted;
2993         fo_tot_pending = obd->u.filter.fo_tot_pending;
2994         fo_tot_dirty = obd->u.filter.fo_tot_dirty;
2995         cfs_spin_unlock(&obd->obd_dev_lock);
2996         cfs_spin_unlock(&obd->obd_osfs_lock);
2997
2998         /* Do these assertions outside the spinlocks so we don't kill system */
2999         if (tot_granted != fo_tot_granted)
3000                 CERROR("%s: tot_granted "LPU64" != fo_tot_granted "LPU64"\n",
3001                        func, tot_granted, fo_tot_granted);
3002         if (tot_pending != fo_tot_pending)
3003                 CERROR("%s: tot_pending "LPU64" != fo_tot_pending "LPU64"\n",
3004                        func, tot_pending, fo_tot_pending);
3005         if (tot_dirty != fo_tot_dirty)
3006                 CERROR("%s: tot_dirty "LPU64" != fo_tot_dirty "LPU64"\n",
3007                        func, tot_dirty, fo_tot_dirty);
3008         if (tot_pending > tot_granted)
3009                 CERROR("%s: tot_pending "LPU64" > tot_granted "LPU64"\n",
3010                        func, tot_pending, tot_granted);
3011         if (tot_granted > maxsize)
3012                 CERROR("%s: tot_granted "LPU64" > maxsize "LPU64"\n",
3013                        func, tot_granted, maxsize);
3014         if (tot_dirty > maxsize)
3015                 CERROR("%s: tot_dirty "LPU64" > maxsize "LPU64"\n",
3016                        func, tot_dirty, maxsize);
3017 }
3018
3019 /* Remove this client from the grant accounting totals.  We also remove
3020  * the export from the obd device under the osfs and dev locks to ensure
3021  * that the filter_grant_sanity_check() calculations are always valid.
3022  * The client should do something similar when it invalidates its import. */
3023 static void filter_grant_discard(struct obd_export *exp)
3024 {
3025         struct obd_device *obd = exp->exp_obd;
3026         struct filter_obd *filter = &obd->u.filter;
3027         struct filter_export_data *fed = &exp->exp_filter_data;
3028
3029         cfs_spin_lock(&obd->obd_osfs_lock);
3030         LASSERTF(filter->fo_tot_granted >= fed->fed_grant,
3031                  "%s: tot_granted "LPU64" cli %s/%p fed_grant %ld\n",
3032                  obd->obd_name, filter->fo_tot_granted,
3033                  exp->exp_client_uuid.uuid, exp, fed->fed_grant);
3034         filter->fo_tot_granted -= fed->fed_grant;
3035         LASSERTF(filter->fo_tot_pending >= fed->fed_pending,
3036                  "%s: tot_pending "LPU64" cli %s/%p fed_pending %ld\n",
3037                  obd->obd_name, filter->fo_tot_pending,
3038                  exp->exp_client_uuid.uuid, exp, fed->fed_pending);
3039         /* fo_tot_pending is handled in filter_grant_commit as bulk finishes */
3040         LASSERTF(filter->fo_tot_dirty >= fed->fed_dirty,
3041                  "%s: tot_dirty "LPU64" cli %s/%p fed_dirty %ld\n",
3042                  obd->obd_name, filter->fo_tot_dirty,
3043                  exp->exp_client_uuid.uuid, exp, fed->fed_dirty);
3044         filter->fo_tot_dirty -= fed->fed_dirty;
3045         fed->fed_dirty = 0;
3046         fed->fed_grant = 0;
3047
3048         cfs_spin_unlock(&obd->obd_osfs_lock);
3049 }
3050
3051 static int filter_destroy_export(struct obd_export *exp)
3052 {
3053         struct filter_export_data *fed = &exp->exp_filter_data;
3054         ENTRY;
3055
3056         if (fed->fed_pending)
3057                 CERROR("%s: cli %s/%p has %lu pending on destroyed export\n",
3058                        exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
3059                        exp, fed->fed_pending);
3060
3061         lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
3062
3063         target_destroy_export(exp);
3064
3065         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
3066                                      &exp->exp_client_uuid)))
3067                RETURN(0);
3068
3069         ldlm_destroy_export(exp);
3070         lut_client_free(exp);
3071
3072         if (!exp->exp_obd->obd_replayable)
3073                 fsfilt_sync(exp->exp_obd, exp->exp_obd->u.obt.obt_sb);
3074
3075         filter_grant_discard(exp);
3076         filter_fmd_cleanup(exp);
3077
3078         if (exp->exp_connect_flags & OBD_CONNECT_GRANT_SHRINK) {
3079                 struct filter_obd *filter = &exp->exp_obd->u.filter;
3080                 if (filter->fo_tot_granted_clients > 0)
3081                         filter->fo_tot_granted_clients --;
3082         }
3083
3084         if (!(exp->exp_flags & OBD_OPT_FORCE))
3085                 filter_grant_sanity_check(exp->exp_obd, __func__);
3086
3087         RETURN(0);
3088 }
3089
3090 static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
3091 {
3092         struct obd_llog_group *olg_min, *olg;
3093         struct filter_obd *filter;
3094         int worked = -1, group;
3095         struct llog_ctxt *ctxt;
3096         ENTRY;
3097
3098         filter = &obd->u.filter;
3099
3100         /* we can't sync log holding spinlock. also, we do not want to get
3101          * into livelock. so we do following: loop over MDS's exports in
3102          * group order and skip already synced llogs -bzzz */
3103         do {
3104                 /* look for group with min. number, but > worked */
3105                 olg_min = NULL;
3106                 group = 1 << 30;
3107                 cfs_spin_lock(&filter->fo_llog_list_lock);
3108                 cfs_list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
3109                         if (olg->olg_seq <= worked) {
3110                                 /* this group is already synced */
3111                                 continue;
3112                         }
3113                         if (group < olg->olg_seq) {
3114                                 /* we have group with smaller number to sync */
3115                                 continue;
3116                         }
3117                         /* store current minimal group */
3118                         olg_min = olg;
3119                         group = olg->olg_seq;
3120                 }
3121                 cfs_spin_unlock(&filter->fo_llog_list_lock);
3122
3123                 if (olg_min == NULL)
3124                         break;
3125
3126                 worked = olg_min->olg_seq;
3127                 if (olg_min->olg_exp &&
3128                     (dexp == olg_min->olg_exp || dexp == NULL)) {
3129                         int err;
3130                         ctxt = llog_group_get_ctxt(olg_min,
3131                                                    LLOG_MDS_OST_REPL_CTXT);
3132                         if (ctxt) {
3133                                 err = llog_sync(ctxt, olg_min->olg_exp, 0);
3134                                 llog_ctxt_put(ctxt);
3135                                 if (err) {
3136                                         CERROR("error flushing logs to MDS: "
3137                                                "rc %d\n", err);
3138                                 }
3139                         }
3140                 }
3141         } while (olg_min != NULL);
3142 }
3143
3144 /* Also incredibly similar to mds_disconnect */
3145 static int filter_disconnect(struct obd_export *exp)
3146 {
3147         struct obd_device *obd = exp->exp_obd;
3148         int rc;
3149         ENTRY;
3150
3151         LASSERT(exp);
3152         class_export_get(exp);
3153
3154         if (!(exp->exp_flags & OBD_OPT_FORCE))
3155                 filter_grant_sanity_check(obd, __func__);
3156         filter_grant_discard(exp);
3157
3158         /* Flush any remaining cancel messages out to the target */
3159         filter_sync_llogs(obd, exp);
3160
3161         lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
3162
3163         rc = server_disconnect_export(exp);
3164
3165         /* Do not erase record for recoverable client. */
3166         if (obd->obd_replayable && (!obd->obd_fail || exp->exp_failed))
3167                 filter_client_del(exp);
3168         else
3169                 fsfilt_sync(obd, obd->u.obt.obt_sb);
3170
3171         class_export_put(exp);
3172         RETURN(rc);
3173 }
3174
3175 /* reverse import is changed, sync all cancels */
3176 static void filter_revimp_update(struct obd_export *exp)
3177 {
3178         ENTRY;
3179
3180         LASSERT(exp);
3181         class_export_get(exp);
3182
3183         /* flush any remaining cancel messages out to the target */
3184         filter_sync_llogs(exp->exp_obd, exp);
3185         class_export_put(exp);
3186         EXIT;
3187 }
3188
3189 static int filter_ping(const struct lu_env *env, struct obd_export *exp)
3190 {
3191         filter_fmd_expire(exp);
3192         return 0;
3193 }
3194
3195 struct dentry *__filter_oa2dentry(struct obd_device *obd, struct ost_id *ostid,
3196                                   const char *what, int quiet)
3197 {
3198         struct dentry *dchild = NULL;
3199
3200         dchild = filter_fid2dentry(obd, NULL,  ostid->oi_seq, ostid->oi_id);
3201
3202         if (IS_ERR(dchild)) {
3203                 CERROR("%s error looking up object: "POSTID"\n",
3204                        what, ostid->oi_id, ostid->oi_seq);
3205                 RETURN(dchild);
3206         }
3207
3208         if (dchild->d_inode == NULL) {
3209                 if (!quiet)