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[fs/lustre-release.git] / lustre / obdfilter / filter.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  *  linux/fs/obdfilter/filter.c
5  *
6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
7  *   Author: Peter Braam <braam@clusterfs.com>
8  *   Author: Andreas Dilger <adilger@clusterfs.com>
9  *
10  *   This file is part of Lustre, http://www.lustre.org.
11  *
12  *   Lustre is free software; you can redistribute it and/or
13  *   modify it under the terms of version 2 of the GNU General Public
14  *   License as published by the Free Software Foundation.
15  *
16  *   Lustre is distributed in the hope that it will be useful,
17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *   GNU General Public License for more details.
20  *
21  *   You should have received a copy of the GNU General Public License
22  *   along with Lustre; if not, write to the Free Software
23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 /*
27  * Invariant: Get O/R i_sem for lookup, if needed, before any journal ops
28  *            (which need to get journal_lock, may block if journal full).
29  *
30  * Invariant: Call filter_start_transno() before any journal ops to avoid the
31  *            same deadlock problem.  We can (and want) to get rid of the
32  *            transno sem in favour of the dir/inode i_sem to avoid single
33  *            threaded operation on the OST.
34  */
35
36 #define DEBUG_SUBSYSTEM S_FILTER
37
38 #include <linux/config.h>
39 #include <linux/module.h>
40 #include <linux/fs.h>
41 #include <linux/dcache.h>
42 #include <linux/init.h>
43 #include <linux/version.h>
44 #include <linux/jbd.h>
45 #include <linux/ext3_fs.h>
46 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
47 # include <linux/mount.h>
48 # include <linux/buffer_head.h>
49 # include <linux/bio.h>
50 #endif
51
52 #include <linux/obd_class.h>
53 #include <linux/obd_lov.h>
54 #include <linux/obd_ost.h>
55 #include <linux/lustre_dlm.h>
56 #include <linux/lustre_fsfilt.h>
57 #include <linux/lprocfs_status.h>
58 #include <linux/lustre_log.h>
59 #include <linux/lustre_commit_confd.h>
60 #include <libcfs/list.h>
61
62 #include <linux/lustre_smfs.h>
63 #include "filter_internal.h"
64
65 /* Group 0 is no longer a legal group, to catch uninitialized IDs */
66 #define FILTER_MIN_GROUPS 3
67
68 static struct lvfs_callback_ops filter_lvfs_ops;
69
70 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
71                           struct lov_stripe_md *ea, struct obd_trans_info *);
72 struct obd_llogs *filter_grab_llog_for_group(struct obd_device *,
73                                              int, struct obd_export *);
74
75 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
76                              void *cb_data, int error)
77 {
78         obd_transno_commit_cb(obd, transno, error);
79 }
80
81 /* Assumes caller has already pushed us into the kernel context. */
82 int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
83                           int rc)
84 {
85         struct filter_obd *filter = &exp->exp_obd->u.filter;
86         struct filter_export_data *fed = &exp->exp_filter_data;
87         struct filter_client_data *fcd = fed->fed_fcd;
88         __u64 last_rcvd;
89         loff_t off;
90         int err, log_pri = D_HA;
91
92         /* Propagate error code. */
93         if (rc)
94                 RETURN(rc);
95
96         if (!exp->exp_obd->obd_replayable || oti == NULL)
97                 RETURN(rc);
98
99         /* we don't allocate new transnos for replayed requests */
100         if (oti->oti_transno == 0) {
101                 spin_lock(&filter->fo_translock);
102                 last_rcvd = le64_to_cpu(filter->fo_fsd->fsd_last_transno) + 1;
103                 filter->fo_fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
104                 spin_unlock(&filter->fo_translock);
105                 oti->oti_transno = last_rcvd;
106         } else {
107                 spin_lock(&filter->fo_translock);
108                 last_rcvd = oti->oti_transno;
109                 if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno))
110                         filter->fo_fsd->fsd_last_transno =
111                                 cpu_to_le64(last_rcvd);
112                 spin_unlock(&filter->fo_translock);
113         }
114         
115         fcd->fcd_last_rcvd = cpu_to_le64(last_rcvd);
116
117         /* could get xid from oti, if it's ever needed */
118         fcd->fcd_last_xid = 0;
119
120         off = fed->fed_lr_off;
121
122         fsfilt_add_journal_cb(exp->exp_obd, filter->fo_sb, last_rcvd,
123                               oti->oti_handle, filter_commit_cb, NULL);
124
125         err = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp, fcd,
126                                   sizeof(*fcd), &off, 0);
127         if (err) {
128                 log_pri = D_ERROR;
129                 if (rc == 0)
130                         rc = err;
131         }
132
133         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
134                last_rcvd, fcd->fcd_uuid, fed->fed_lr_idx, err);
135
136         RETURN(rc);
137 }
138
139 void f_dput(struct dentry *dentry)
140 {
141         /* Can't go inside filter_ddelete because it can block */
142         CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
143                dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
144         LASSERT(atomic_read(&dentry->d_count) > 0);
145
146         dput(dentry);
147 }
148
149 /* Add client data to the FILTER.  We use a bitmap to locate a free space
150  * in the last_rcvd file if cl_idx is -1 (i.e. a new client).
151  * Otherwise, we have just read the data from the last_rcvd file and
152  * we know its offset. */
153 static int filter_client_add(struct obd_device *obd, struct filter_obd *filter,
154                              struct filter_export_data *fed, int cl_idx)
155 {
156         unsigned long *bitmap = filter->fo_last_rcvd_slots;
157         int new_client = (cl_idx == -1);
158         ENTRY;
159
160         LASSERT(bitmap != NULL);
161
162         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
163         if (!strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid))
164                 RETURN(0);
165
166         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
167          * there's no need for extra complication here
168          */
169         if (new_client) {
170                 cl_idx = find_first_zero_bit(bitmap, FILTER_LR_MAX_CLIENTS);
171         repeat:
172                 if (cl_idx >= FILTER_LR_MAX_CLIENTS) {
173                         CERROR("no client slots - fix FILTER_LR_MAX_CLIENTS\n");
174                         RETURN(-ENOMEM);
175                 }
176                 if (test_and_set_bit(cl_idx, bitmap)) {
177                         CERROR("FILTER client %d: found bit is set in bitmap\n",
178                                cl_idx);
179                         cl_idx = find_next_zero_bit(bitmap,
180                                                     FILTER_LR_MAX_CLIENTS,
181                                                     cl_idx);
182                         goto repeat;
183                 }
184         } else {
185                 if (test_and_set_bit(cl_idx, bitmap)) {
186                         CERROR("FILTER client %d: bit already set in bitmap!\n",
187                                cl_idx);
188                         LBUG();
189                 }
190         }
191
192         fed->fed_lr_idx = cl_idx;
193         fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->fsd_client_start) +
194                 cl_idx * le16_to_cpu(filter->fo_fsd->fsd_client_size);
195
196         CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
197                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
198
199         if (new_client) {
200                 struct lvfs_run_ctxt saved;
201                 loff_t off = fed->fed_lr_off;
202                 int err;
203                 void *handle;
204
205                 CDEBUG(D_INFO, "writing client fcd at idx %u (%llu) (len %u)\n",
206                        fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_fcd));
207
208                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
209                 /* Transaction needed to fix bug 1403 */
210                 handle = fsfilt_start(obd,
211                                       filter->fo_rcvd_filp->f_dentry->d_inode,
212                                       FSFILT_OP_SETATTR, NULL);
213                 if (IS_ERR(handle)) {
214                         err = PTR_ERR(handle);
215                         CERROR("unable to start transaction: rc %d\n", err);
216                 } else {
217                         err = fsfilt_write_record(obd, filter->fo_rcvd_filp,
218                                                   fed->fed_fcd,
219                                                   sizeof(*fed->fed_fcd),
220                                                   &off, 1);
221                         fsfilt_commit(obd, filter->fo_sb,
222                                       filter->fo_rcvd_filp->f_dentry->d_inode,
223                                       handle, 1);
224                 }
225                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
226
227                 if (err) {
228                         CERROR("error writing %s client idx %u: rc %d\n",
229                                LAST_RCVD, fed->fed_lr_idx, err);
230                         RETURN(err);
231                 }
232         }
233         RETURN(0);
234 }
235
236 static int filter_client_free(struct obd_export *exp, int flags)
237 {
238         struct filter_export_data *fed = &exp->exp_filter_data;
239         struct filter_obd *filter = &exp->exp_obd->u.filter;
240         struct obd_device *obd = exp->exp_obd;
241         struct filter_client_data zero_fcd;
242         struct lvfs_run_ctxt saved;
243         int rc;
244         loff_t off;
245         ENTRY;
246
247         if (fed->fed_fcd == NULL)
248                 RETURN(0);
249
250         if (flags & OBD_OPT_FAILOVER)
251                 GOTO(free, 0);
252
253         /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
254         if (strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid ) == 0)
255                 GOTO(free, 0);
256
257         LASSERT(filter->fo_last_rcvd_slots != NULL);
258
259         off = fed->fed_lr_off;
260
261         CDEBUG(D_INFO, "freeing client at idx %u (%lld) with UUID '%s'\n",
262                fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
263
264         /* Clear the bit _after_ zeroing out the client so we don't
265            race with filter_client_add and zero out new clients.*/
266         if (!test_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
267                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
268                        fed->fed_lr_idx);
269                 LBUG();
270         }
271
272         memset(&zero_fcd, 0, sizeof zero_fcd);
273         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
274         rc = fsfilt_write_record(obd, filter->fo_rcvd_filp, &zero_fcd,
275                                  sizeof(zero_fcd), &off, 1);
276         if (rc == 0)
277                 /* update server's transno */
278                 filter_update_server_data(obd, filter->fo_rcvd_filp,
279                                           filter->fo_fsd, 1);
280         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
281
282         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
283                "zeroing disconnecting client %s at idx %u (%llu) in %s rc %d\n",
284                fed->fed_fcd->fcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
285                LAST_RCVD, rc);
286
287         if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
288                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
289                        fed->fed_lr_idx);
290                 LBUG();
291         }
292
293 free:
294         OBD_FREE(fed->fed_fcd, sizeof(*fed->fed_fcd));
295
296         RETURN(0);
297 }
298
299 static int filter_free_server_data(struct filter_obd *filter)
300 {
301         OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
302         filter->fo_fsd = NULL;
303         OBD_FREE(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENTS/8);
304         filter->fo_last_rcvd_slots = NULL;
305         return 0;
306 }
307
308 /* assumes caller is already in kernel ctxt */
309 int filter_update_server_data(struct obd_device *obd, struct file *filp,
310                               struct filter_server_data *fsd, int force_sync)
311 {
312         loff_t off = 0;
313         int rc;
314         ENTRY;
315
316         CDEBUG(D_INODE, "server uuid      : %s\n", fsd->fsd_uuid);
317         CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
318                le64_to_cpu(fsd->fsd_last_transno));
319         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
320                le64_to_cpu(fsd->fsd_mount_count));
321
322         rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off,force_sync);
323         if (rc)
324                 CERROR("error writing filter_server_data: rc = %d\n", rc);
325
326         RETURN(rc);
327 }
328
329 int filter_update_last_objid(struct obd_device *obd, obd_gr group,
330                              int force_sync)
331 {
332         struct filter_obd *filter = &obd->u.filter;
333         __u64 tmp;
334         loff_t off = 0;
335         int rc;
336         ENTRY;
337
338         if (filter->fo_last_objid_files[group] == NULL) {
339                 CERROR("Object group "LPU64" not fully setup; not updating "
340                        "last_objid\n", group);
341                 RETURN(0);
342         }
343
344         CDEBUG(D_INODE, "server last_objid for group "LPU64": "LPU64"\n",
345                group, filter->fo_last_objids[group]);
346
347         tmp = cpu_to_le64(filter->fo_last_objids[group]);
348         rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
349                                  &tmp, sizeof(tmp), &off, force_sync);
350         if (rc)
351                 CERROR("error writing group "LPU64" last objid: rc = %d\n",
352                        group, rc);
353         RETURN(rc);
354 }
355
356 /* assumes caller has already in kernel ctxt */
357 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
358 {
359         struct filter_obd *filter = &obd->u.filter;
360         struct filter_server_data *fsd;
361         struct filter_client_data *fcd = NULL;
362         struct inode *inode = filp->f_dentry->d_inode;
363         unsigned long last_rcvd_size = inode->i_size;
364         __u64 mount_count;
365         int cl_idx;
366         loff_t off = 0;
367         int rc;
368
369         /* ensure padding in the struct is the correct size */
370         LASSERT (offsetof(struct filter_server_data, fsd_padding) +
371                  sizeof(fsd->fsd_padding) == FILTER_LR_SERVER_SIZE);
372         LASSERT (offsetof(struct filter_client_data, fcd_padding) +
373                  sizeof(fcd->fcd_padding) == FILTER_LR_CLIENT_SIZE);
374
375         OBD_ALLOC(fsd, sizeof(*fsd));
376         if (!fsd)
377                 RETURN(-ENOMEM);
378         filter->fo_fsd = fsd;
379
380         OBD_ALLOC(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENTS/8);
381         if (filter->fo_last_rcvd_slots == NULL) {
382                 OBD_FREE(fsd, sizeof(*fsd));
383                 RETURN(-ENOMEM);
384         }
385
386         if (last_rcvd_size == 0) {
387                 CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD);
388
389                 memcpy(fsd->fsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->fsd_uuid));
390                 fsd->fsd_last_transno = 0;
391                 mount_count = fsd->fsd_mount_count = 0;
392                 fsd->fsd_server_size = cpu_to_le32(FILTER_LR_SERVER_SIZE);
393                 fsd->fsd_client_start = cpu_to_le32(FILTER_LR_CLIENT_START);
394                 fsd->fsd_client_size = cpu_to_le16(FILTER_LR_CLIENT_SIZE);
395                 fsd->fsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
396                 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
397         } else {
398                 rc = fsfilt_read_record(obd, filp, fsd, sizeof(*fsd), &off);
399                 if (rc) {
400                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
401                                LAST_RCVD, rc);
402                         GOTO(err_fsd, rc);
403                 }
404                 if (strcmp(fsd->fsd_uuid, obd->obd_uuid.uuid) != 0) {
405                         CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
406                                obd->obd_uuid.uuid, fsd->fsd_uuid);
407                         GOTO(err_fsd, rc = -EINVAL);
408                 }
409                 mount_count = le64_to_cpu(fsd->fsd_mount_count);
410                 filter->fo_subdir_count = le16_to_cpu(fsd->fsd_subdir_count);
411         }
412
413         if (fsd->fsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
414                 CERROR("unsupported feature %x\n",
415                        le32_to_cpu(fsd->fsd_feature_incompat) &
416                        ~FILTER_INCOMPAT_SUPP);
417                 GOTO(err_fsd, rc = -EINVAL);
418         }
419         if (fsd->fsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
420                 CERROR("read-only feature %x\n",
421                        le32_to_cpu(fsd->fsd_feature_rocompat) &
422                        ~FILTER_ROCOMPAT_SUPP);
423                 /* Do something like remount filesystem read-only */
424                 GOTO(err_fsd, rc = -EINVAL);
425         }
426
427         CDEBUG(D_INODE, "%s: server last_rcvd : "LPU64"\n",
428                obd->obd_name, le64_to_cpu(fsd->fsd_last_transno));
429         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
430                obd->obd_name, mount_count + 1);
431         CDEBUG(D_INODE, "%s: server data size: %u\n",
432                obd->obd_name, le32_to_cpu(fsd->fsd_server_size));
433         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
434                obd->obd_name, le32_to_cpu(fsd->fsd_client_start));
435         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
436                obd->obd_name, le32_to_cpu(fsd->fsd_client_size));
437         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
438                obd->obd_name, le16_to_cpu(fsd->fsd_subdir_count));
439         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
440                last_rcvd_size <= le32_to_cpu(fsd->fsd_client_start) ? 0 :
441                (last_rcvd_size - le32_to_cpu(fsd->fsd_client_start)) /
442                 le16_to_cpu(fsd->fsd_client_size));
443
444         if (!obd->obd_replayable) {
445                 CWARN("%s: recovery support OFF\n", obd->obd_name);
446                 GOTO(out, rc = 0);
447         }
448
449         for (cl_idx = 0, off = le32_to_cpu(fsd->fsd_client_start);
450              off < last_rcvd_size; cl_idx++) {
451                 __u64 last_rcvd;
452                 struct obd_export *exp;
453                 struct filter_export_data *fed;
454
455                 if (!fcd) {
456                         OBD_ALLOC(fcd, sizeof(*fcd));
457                         if (!fcd)
458                                 GOTO(err_client, rc = -ENOMEM);
459                 }
460
461                 /* Don't assume off is incremented properly by
462                  * fsfilt_read_record(), in case sizeof(*fcd)
463                  * isn't the same as fsd->fsd_client_size.  */
464                 off = le32_to_cpu(fsd->fsd_client_start) +
465                         cl_idx * le16_to_cpu(fsd->fsd_client_size);
466                 rc = fsfilt_read_record(obd, filp, fcd, sizeof(*fcd), &off);
467                 if (rc) {
468                         CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
469                                LAST_RCVD, cl_idx, off, rc);
470                         break; /* read error shouldn't cause startup to fail */
471                 }
472
473                 if (fcd->fcd_uuid[0] == '\0') {
474                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
475                                cl_idx);
476                         continue;
477                 }
478
479                 last_rcvd = le64_to_cpu(fcd->fcd_last_rcvd);
480
481                 /* These exports are cleaned up by filter_disconnect(), so they
482                  * need to be set up like real exports as filter_connect() does.
483                  */
484                 exp = class_new_export(obd);
485                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64" "
486                        "srv lr: "LPU64" fcd_group %d \n", fcd->fcd_uuid, cl_idx,
487                        last_rcvd, le64_to_cpu(fsd->fsd_last_transno), 
488                        le32_to_cpu(fcd->fcd_group));
489                 if (exp == NULL)
490                         GOTO(err_client, rc = -ENOMEM);
491
492                 memcpy(&exp->exp_client_uuid.uuid, fcd->fcd_uuid,
493                        sizeof exp->exp_client_uuid.uuid);
494                 fed = &exp->exp_filter_data;
495                 fed->fed_fcd = fcd;
496                 fed->fed_group = le32_to_cpu(fcd->fcd_group);
497                 filter_client_add(obd, filter, fed, cl_idx);
498                 /* create helper if export init gets more complex */
499                 spin_lock_init(&fed->fed_lock);
500
501                 fcd = NULL;
502                 exp->exp_req_replay_needed = 1;
503                 exp->exp_lock_replay_needed = 1;
504                 atomic_inc(&obd->obd_req_replay_clients);
505                 atomic_inc(&obd->obd_lock_replay_clients);
506                 obd->obd_recoverable_clients++;
507                 obd->obd_max_recoverable_clients++;
508                 class_export_put(exp);
509
510                 CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
511                        cl_idx, last_rcvd);
512
513                 if (last_rcvd > le64_to_cpu(fsd->fsd_last_transno))
514                         fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
515
516         }
517
518         obd->obd_last_committed = le64_to_cpu(fsd->fsd_last_transno);
519
520         if (obd->obd_recoverable_clients) {
521                 CWARN("RECOVERY: service %s, %d recoverable clients, "
522                       "last_transno "LPU64"\n", obd->obd_name,
523                       obd->obd_recoverable_clients,
524                       le64_to_cpu(fsd->fsd_last_transno));
525                 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
526                 target_start_recovery_thread(obd, ost_handle);
527         }
528
529         if (fcd)
530                 OBD_FREE(fcd, sizeof(*fcd));
531
532 out:
533         filter->fo_mount_count = mount_count + 1;
534         fsd->fsd_mount_count = cpu_to_le64(filter->fo_mount_count);
535
536         /* save it, so mount count and last_transno is current */
537         rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
538         if (rc)
539                 GOTO(err_client, rc);
540         RETURN(0);
541
542 err_client:
543         class_disconnect_exports(obd, 0);
544 err_fsd:
545         filter_free_server_data(filter);
546         RETURN(rc);
547 }
548
549 static int filter_cleanup_groups(struct obd_device *obd)
550 {
551         struct filter_obd *filter = &obd->u.filter;
552         struct dentry *dentry;
553         int i, k;
554         ENTRY;
555
556         for (i = 0; i < filter->fo_group_count; i++) {
557                 if (filter->fo_subdirs != NULL) {
558                         for (k = 0; k < filter->fo_subdir_count; k++) {
559                                 dentry = filter->fo_subdirs[i].dentry[k];
560                                 if (dentry == NULL)
561                                         continue;
562                                 f_dput(dentry);
563                                 filter->fo_subdirs[i].dentry[k] = NULL;
564                         }
565                 }
566                 if (filter->fo_last_objid_files[i] != NULL) {
567                         filp_close(filter->fo_last_objid_files[i], 0);
568                         filter->fo_last_objid_files[i] = NULL;
569                 }
570                 if (filter->fo_groups[i] != NULL) {
571                         dput(filter->fo_groups[i]);
572                         filter->fo_groups[i] = NULL;
573                 }
574         }
575         if (filter->fo_subdirs != NULL)
576                 OBD_FREE(filter->fo_subdirs,
577                          filter->fo_group_count * sizeof(*filter->fo_subdirs));
578         if (filter->fo_groups != NULL)
579                 OBD_FREE(filter->fo_groups,
580                          filter->fo_group_count * sizeof(*filter->fo_groups));
581         if (filter->fo_last_objids != NULL)
582                 OBD_FREE(filter->fo_last_objids,
583                          filter->fo_group_count * sizeof(__u64));
584         if (filter->fo_last_objid_files != NULL)
585                 OBD_FREE(filter->fo_last_objid_files,
586                          filter->fo_group_count * sizeof(struct file *));
587         f_dput(filter->fo_dentry_O);
588         RETURN(0);
589 }
590
591 static int filter_update_last_group(struct obd_device *obd, int group)
592 {
593         struct filter_obd *filter = &obd->u.filter;
594         struct file *filp = NULL;
595         int last_group = 0, rc;
596         loff_t off = 0;
597         ENTRY;
598
599         if (group <= filter->fo_committed_group)
600                 RETURN(0);
601
602         filp = filp_open("LAST_GROUP", O_RDWR, 0700);
603         if (IS_ERR(filp)) {
604                 rc = PTR_ERR(filp);
605                 filp = NULL;
606                 CERROR("cannot open LAST_GROUP: rc = %d\n", rc);
607                 GOTO(cleanup, rc);
608         }
609
610         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
611         if (rc) {
612                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n",rc);
613                 GOTO(cleanup, rc);
614         }
615         LASSERT(off == 0 || last_group >= FILTER_MIN_GROUPS);
616         CDEBUG(D_INODE, "%s: previous %d, new %d\n",
617                obd->obd_name, last_group, group);
618
619         off = 0;
620         last_group = group;
621         /* must be sync: bXXXX */
622         rc = fsfilt_write_record(obd, filp, &last_group, sizeof(__u32), &off, 1);
623         if (rc) {
624                 CDEBUG(D_INODE, "error updating LAST_GROUP: rc %d\n", rc);
625                 GOTO(cleanup, rc);
626         }
627
628         filter->fo_committed_group = group;
629 cleanup:
630         if (filp)
631                 filp_close(filp, 0);
632         RETURN(rc);
633 }
634
635 static int filter_read_group_internal(struct obd_device *obd, int group,
636                                       int create)
637 {
638         struct filter_obd *filter = &obd->u.filter;
639         __u64 *new_objids = NULL;
640         struct filter_subdirs *new_subdirs = NULL, *tmp_subdirs = NULL;
641         struct dentry **new_groups = NULL;
642         struct file **new_files = NULL;
643         struct dentry *dentry;
644         struct file *filp;
645         int old_count = filter->fo_group_count, rc, stage = 0, i;
646         char name[25];
647         __u64 last_objid;
648         loff_t off = 0;
649
650         snprintf(name, 24, "%d", group);
651         name[24] = '\0';
652
653         if (!create) {
654                 dentry = ll_lookup_one_len(name, filter->fo_dentry_O,
655                                            strlen(name));
656                 if (IS_ERR(dentry)) {
657                         CERROR("Cannot lookup expected object group %d: %ld\n",
658                                group, PTR_ERR(dentry));
659                         RETURN(PTR_ERR(dentry));
660                 }
661         } else {
662                 dentry = simple_mkdir(filter->fo_dentry_O, name, 0700, 1);
663                 if (IS_ERR(dentry)) {
664                         CERROR("cannot lookup/create O/%s: rc = %ld\n", name,
665                                PTR_ERR(dentry));
666                         RETURN(PTR_ERR(dentry));
667                 }
668         }
669         stage = 1;
670
671         snprintf(name, 24, "O/%d/LAST_ID", group);
672         name[24] = '\0';
673         filp = filp_open(name, O_CREAT | O_RDWR, 0700);
674         if (IS_ERR(filp)) {
675                 CERROR("cannot create %s: rc = %ld\n", name, PTR_ERR(filp));
676                 GOTO(cleanup, rc = PTR_ERR(filp));
677         }
678         stage = 2;
679
680         rc = fsfilt_read_record(obd, filp, &last_objid, sizeof(__u64), &off);
681         if (rc) {
682                 CDEBUG(D_INODE, "error reading %s: rc %d\n", name, rc);
683                 GOTO(cleanup, rc);
684         }
685
686         if (filter->fo_subdir_count) {
687                 OBD_ALLOC(tmp_subdirs, sizeof(*tmp_subdirs));
688                 if (tmp_subdirs == NULL)
689                         GOTO(cleanup, rc = -ENOMEM);
690                 stage = 3;
691
692                 for (i = 0; i < filter->fo_subdir_count; i++) {
693                         char dir[20];
694                         snprintf(dir, sizeof(dir), "d%u", i);
695
696                         tmp_subdirs->dentry[i] =
697                                 simple_mkdir(dentry, dir, 0700, 1);
698                         if (IS_ERR(tmp_subdirs->dentry[i])) {
699                                 rc = PTR_ERR(tmp_subdirs->dentry[i]);
700                                 CERROR("can't lookup/create O/%d/%s: rc = %d\n",
701                                        group, dir, rc);
702                                 GOTO(cleanup, rc);
703                         }
704                         CDEBUG(D_INODE, "got/created O/%d/%s: %p\n", group, dir,
705                                tmp_subdirs->dentry[i]);
706                 }
707         }
708
709         /* 'group' is an index; we need an array of length 'group + 1' */
710         if (group + 1 > old_count) {
711                 int len = group + 1;
712                 OBD_ALLOC(new_objids, len * sizeof(*new_objids));
713                 OBD_ALLOC(new_subdirs, len * sizeof(*new_subdirs));
714                 OBD_ALLOC(new_groups, len * sizeof(*new_groups));
715                 OBD_ALLOC(new_files, len * sizeof(*new_files));
716                 stage = 4;
717                 if (new_objids == NULL || new_subdirs == NULL ||
718                     new_groups == NULL || new_files == NULL)
719                         GOTO(cleanup, rc = -ENOMEM);
720
721                 memcpy(new_objids, filter->fo_last_objids,
722                        old_count * sizeof(*new_objids));
723                 memcpy(new_subdirs, filter->fo_subdirs,
724                        old_count * sizeof(*new_subdirs));
725                 memcpy(new_groups, filter->fo_groups,
726                        old_count * sizeof(*new_groups));
727                 memcpy(new_files, filter->fo_last_objid_files,
728                        old_count * sizeof(*new_files));
729
730                 if (old_count) {
731                         OBD_FREE(filter->fo_last_objids,
732                                  old_count * sizeof(*new_objids));
733                         OBD_FREE(filter->fo_subdirs,
734                                  old_count * sizeof(*new_subdirs));
735                         OBD_FREE(filter->fo_groups,
736                                  old_count * sizeof(*new_groups));
737                         OBD_FREE(filter->fo_last_objid_files,
738                                  old_count * sizeof(*new_files));
739                 }
740                 filter->fo_last_objids = new_objids;
741                 filter->fo_subdirs = new_subdirs;
742                 filter->fo_groups = new_groups;
743                 filter->fo_last_objid_files = new_files;
744                 filter->fo_group_count = len;
745         }
746
747         filter->fo_groups[group] = dentry;
748         filter->fo_last_objid_files[group] = filp;
749         if (filter->fo_subdir_count) {
750                 filter->fo_subdirs[group] = *tmp_subdirs;
751                 OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
752         }
753
754         filter_update_last_group(obd, group);
755         
756         if (filp->f_dentry->d_inode->i_size == 0) {
757                 filter->fo_last_objids[group] = FILTER_INIT_OBJID;
758                 RETURN(0);
759         }
760
761         filter->fo_last_objids[group] = le64_to_cpu(last_objid);
762         CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
763                obd->obd_name, group, last_objid);
764         RETURN(0);
765  cleanup:
766         switch (stage) {
767         case 4:
768                 if (new_objids != NULL)
769                         OBD_FREE(new_objids, group * sizeof(*new_objids));
770                 if (new_subdirs != NULL)
771                         OBD_FREE(new_subdirs, group * sizeof(*new_subdirs));
772                 if (new_groups != NULL)
773                         OBD_FREE(new_groups, group * sizeof(*new_groups));
774                 if (new_files != NULL)
775                         OBD_FREE(new_files, group * sizeof(*new_files));
776         case 3:
777                 if (filter->fo_subdir_count) {
778                         for (i = 0; i < filter->fo_subdir_count; i++) {
779                                 if (tmp_subdirs->dentry[i] != NULL)
780                                         dput(tmp_subdirs->dentry[i]);
781                         }
782                         OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
783                 }
784         case 2:
785                 filp_close(filp, 0);
786         case 1:
787                 dput(dentry);
788         }
789         RETURN(rc);
790 }
791
792 static int filter_read_groups(struct obd_device *obd, int last_group,
793                               int create)
794 {
795         struct filter_obd *filter = &obd->u.filter;
796         int old_count, group, rc = 0;
797
798         down(&filter->fo_init_lock);
799         old_count = filter->fo_group_count;
800         for (group = old_count; group <= last_group; group++) {
801                 if (group == 0)
802                         continue; /* no group zero */
803
804                 rc = filter_read_group_internal(obd, group, create);
805                 if (rc != 0)
806                         break;
807         }
808         up(&filter->fo_init_lock);
809         return rc;
810 }
811
812 static int filter_prep_groups(struct obd_device *obd)
813 {
814         struct filter_obd *filter = &obd->u.filter;
815         struct dentry *dentry, *O_dentry;
816         int rc = 0, cleanup_phase = 0;
817         struct file *filp = NULL;
818         int last_group;
819         loff_t off = 0;
820         ENTRY;
821
822         O_dentry = simple_mkdir(current->fs->pwd, "O", 0700, 1);
823         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
824         if (IS_ERR(O_dentry)) {
825                 rc = PTR_ERR(O_dentry);
826                 CERROR("cannot open/create O: rc = %d\n", rc);
827                 GOTO(cleanup, rc);
828         }
829         filter->fo_dentry_O = O_dentry;
830         cleanup_phase = 1; /* O_dentry */
831
832         /* Lookup "R" to tell if we're on an old OST FS and need to convert
833          * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
834          * some time post 1.0 when all old-style OSTs have converted along
835          * with the init_objid hack. */
836         dentry = ll_lookup_one_len("R", O_dentry, 1);
837         if (IS_ERR(dentry))
838                 GOTO(cleanup, rc = PTR_ERR(dentry));
839         if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
840                 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
841                 ENTRY;
842
843                 CWARN("converting OST to new object layout\n");
844                 if (IS_ERR(O0_dentry)) {
845                         rc = PTR_ERR(O0_dentry);
846                         CERROR("error looking up O/0: rc %d\n", rc);
847                         GOTO(cleanup_R, rc);
848                 }
849
850                 if (O0_dentry->d_inode) {
851                         CERROR("Both O/R and O/0 exist. Fix manually.\n");
852                         GOTO(cleanup_O0, rc = -EEXIST);
853                 }
854
855                 down(&O_dentry->d_inode->i_sem);
856                 rc = vfs_rename(O_dentry->d_inode, dentry,
857                                 O_dentry->d_inode, O0_dentry);
858                 up(&O_dentry->d_inode->i_sem);
859
860                 if (rc) {
861                         CERROR("error renaming O/R to O/0: rc %d\n", rc);
862                         GOTO(cleanup_O0, rc);
863                 }
864                 filter->fo_fsd->fsd_feature_incompat |=
865                         cpu_to_le32(FILTER_INCOMPAT_GROUPS);
866                 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
867                                                filter->fo_fsd, 1);
868                 GOTO(cleanup_O0, rc);
869
870         cleanup_O0:
871                 f_dput(O0_dentry);
872         cleanup_R:
873                 f_dput(dentry);
874                 if (rc)
875                         GOTO(cleanup, rc);
876         } else {
877                 f_dput(dentry);
878         }
879
880         cleanup_phase = 2; /* groups */
881
882         /* we have to initialize all groups before first connections from
883          * clients because they may send create/destroy for any group -bzzz */
884         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
885         if (IS_ERR(filp)) {
886                 CERROR("cannot create LAST_GROUP: rc = %ld\n", PTR_ERR(filp));
887                 GOTO(cleanup, rc = PTR_ERR(filp));
888         }
889         cleanup_phase = 3; /* filp */
890
891         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
892         if (rc) {
893                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n", rc);
894                 GOTO(cleanup, rc);
895         }
896         if (off == 0) {
897                 last_group = FILTER_MIN_GROUPS;
898         } else {
899                 LASSERT(last_group >= FILTER_MIN_GROUPS);
900         }
901
902         CWARN("%s: initialize groups [%d,%d]\n", obd->obd_name,
903               FILTER_MIN_GROUPS, last_group);
904         filter->fo_committed_group = last_group;
905         rc = filter_read_groups(obd, last_group, 1);
906         if (rc)
907                 GOTO(cleanup, rc);
908         
909         filp_close(filp, 0);
910         RETURN(0);
911
912  cleanup:
913         switch (cleanup_phase) {
914         case 3:
915                 filp_close(filp, 0);
916         case 2:
917                 filter_cleanup_groups(obd);
918         case 1:
919                 f_dput(filter->fo_dentry_O);
920                 filter->fo_dentry_O = NULL;
921         default:
922                 break;
923         }
924         return rc;
925 }
926
927 /* setup the object store with correct subdirectories */
928 static int filter_prep(struct obd_device *obd)
929 {
930         struct lvfs_run_ctxt saved;
931         struct filter_obd *filter = &obd->u.filter;
932         struct file *file;
933         struct inode *inode;
934         int rc = 0;
935         ENTRY;
936
937         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
938         file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
939         if (!file || IS_ERR(file)) {
940                 rc = PTR_ERR(file);
941                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
942                        LAST_RCVD, rc);
943                 GOTO(out, rc);
944         }
945
946         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
947                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
948                        file->f_dentry->d_inode->i_mode);
949                 GOTO(err_filp, rc = -ENOENT);
950         }
951
952         /* steal operations */
953         inode = file->f_dentry->d_inode;
954         filter->fo_fop = file->f_op;
955         filter->fo_iop = inode->i_op;
956         filter->fo_aops = inode->i_mapping->a_ops;
957
958         rc = filter_init_server_data(obd, file);
959         if (rc) {
960                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
961                 GOTO(err_filp, rc);
962         }
963         filter->fo_rcvd_filp = file;
964
965         rc = filter_prep_groups(obd);
966         if (rc)
967                 GOTO(err_server_data, rc);
968
969  out:
970         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
971
972         return(rc);
973
974  err_server_data:
975         //class_disconnect_exports(obd, 0);
976         filter_free_server_data(filter);
977  err_filp:
978         if (filp_close(file, 0))
979                 CERROR("can't close %s after error\n", LAST_RCVD);
980         filter->fo_rcvd_filp = NULL;
981         goto out;
982 }
983
984 /* cleanup the filter: write last used object id to status file */
985 static void filter_post(struct obd_device *obd)
986 {
987         struct lvfs_run_ctxt saved;
988         struct filter_obd *filter = &obd->u.filter;
989         int rc, i;
990
991         /* XXX: filter_update_lastobjid used to call fsync_dev.  It might be
992          * best to start a transaction with h_sync, because we removed this
993          * from lastobjid */
994
995         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
996         rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
997                                        filter->fo_fsd, 0);
998         if (rc)
999                 CERROR("error writing server data: rc = %d\n", rc);
1000
1001         for (i = 1; i < filter->fo_group_count; i++) {
1002                 rc = filter_update_last_objid(obd, i,
1003                                              (i == filter->fo_group_count - 1));
1004                 if (rc)
1005                         CERROR("error writing group %d lastobjid: rc = %d\n",
1006                                i, rc);
1007         }
1008
1009         rc = filp_close(filter->fo_rcvd_filp, 0);
1010         filter->fo_rcvd_filp = NULL;
1011         if (rc)
1012                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
1013
1014         filter_cleanup_groups(obd);
1015         filter_free_server_data(filter);
1016         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1017 }
1018
1019 static void filter_set_last_id(struct filter_obd *filter, int group, obd_id id)
1020 {
1021         LASSERT(filter->fo_fsd != NULL);
1022         LASSERT(group > 0);
1023         LASSERT(group < filter->fo_group_count);
1024
1025         spin_lock(&filter->fo_objidlock);
1026         filter->fo_last_objids[group] = id;
1027         spin_unlock(&filter->fo_objidlock);
1028 }
1029
1030 __u64 filter_last_id(struct filter_obd *filter, int group)
1031 {
1032         obd_id id;
1033         LASSERT(filter->fo_fsd != NULL);
1034         LASSERT(group > 0);
1035         LASSERT(group < filter->fo_group_count);
1036
1037         spin_lock(&filter->fo_objidlock);
1038         id = filter->fo_last_objids[group];
1039         spin_unlock(&filter->fo_objidlock);
1040
1041         return id;
1042 }
1043
1044 /* direct cut-n-paste of mds_blocking_ast() */
1045 static int filter_blocking_ast(struct ldlm_lock *lock,
1046                                struct ldlm_lock_desc *desc,
1047                                void *data, int flag)
1048 {
1049         int do_ast;
1050         ENTRY;
1051
1052         if (flag == LDLM_CB_CANCELING) {
1053                 /* Don't need to do anything here. */
1054                 RETURN(0);
1055         }
1056
1057         /* XXX layering violation!  -phil */
1058         l_lock(&lock->l_resource->lr_namespace->ns_lock);
1059         /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
1060          * such that filter_blocking_ast is called just before l_i_p takes the
1061          * ns_lock, then by the time we get the lock, we might not be the
1062          * correct blocking function anymore.  So check, and return early, if
1063          * so. */
1064         if (lock->l_blocking_ast != filter_blocking_ast) {
1065                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
1066                 RETURN(0);
1067         }
1068
1069         lock->l_flags |= LDLM_FL_CBPENDING;
1070         do_ast = (!lock->l_readers && !lock->l_writers);
1071         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
1072
1073         if (do_ast) {
1074                 struct lustre_handle lockh;
1075                 int rc;
1076
1077                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
1078                 ldlm_lock2handle(lock, &lockh);
1079                 rc = ldlm_cli_cancel(&lockh);
1080                 if (rc < 0)
1081                         CERROR("ldlm_cli_cancel: %d\n", rc);
1082         } else {
1083                 LDLM_DEBUG(lock, "Lock still has references, will be "
1084                            "cancelled later");
1085         }
1086         RETURN(0);
1087 }
1088
1089 extern void *lock_dir(struct inode *dir, struct qstr *name);
1090 extern void unlock_dir(struct inode *dir, void *lock);
1091
1092 static void * filter_lock_dentry(struct obd_device *obd,
1093                                  struct dentry *dparent, obd_id id)
1094 {
1095 #ifdef S_PDIROPS
1096         struct qstr qstr;
1097         char name[32];
1098         qstr.name = name;
1099         qstr.len = sprintf(name, LPU64, id);
1100         return lock_dir(dparent->d_inode, &qstr);
1101 #else
1102         down(&dparent->d_inode->i_sem);
1103 #endif
1104         return 0;
1105 }
1106
1107 /* We never dget the object parent, so DON'T dput it either */
1108 static void filter_parent_unlock(struct dentry *dparent, void *lock)
1109 {
1110 #ifdef S_PDIROPS
1111         LASSERT(lock != NULL);
1112         unlock_dir(dparent->d_inode, lock);
1113 #else
1114         up(&dparent->d_inode->i_sem);
1115 #endif
1116 }
1117
1118 /* We never dget the object parent, so DON'T dput it either */
1119 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
1120 {
1121         struct filter_obd *filter = &obd->u.filter;
1122         LASSERT(group < filter->fo_group_count);
1123         LASSERT(group > 0);
1124
1125         if (filter->fo_subdir_count == 0)
1126                 return filter->fo_groups[group];
1127
1128         return filter->fo_subdirs[group].dentry[objid & (filter->fo_subdir_count - 1)];
1129 }
1130
1131 /* We never dget the object parent, so DON'T dput it either */
1132 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
1133                                   obd_id objid, void **lock)
1134 {
1135         unsigned long now = jiffies;
1136         struct dentry *dparent = filter_parent(obd, group, objid);
1137
1138         if (IS_ERR(dparent))
1139                 return dparent;
1140
1141         LASSERT(dparent);
1142         LASSERT(dparent->d_inode);
1143
1144         *lock = filter_lock_dentry(obd, dparent, objid);
1145         fsfilt_check_slow(now, obd_timeout, "parent lock");
1146         return dparent;
1147 }
1148
1149 /* How to get files, dentries, inodes from object id's.
1150  *
1151  * If dir_dentry is passed, the caller has already locked the parent
1152  * appropriately for this operation (normally a write lock).  If
1153  * dir_dentry is NULL, we do a read lock while we do the lookup to
1154  * avoid races with create/destroy and such changing the directory
1155  * internal to the filesystem code. */
1156 struct dentry *filter_id2dentry(struct obd_device *obd,
1157                                 struct dentry *dir_dentry,
1158                                 obd_gr group, obd_id id)
1159 {
1160         struct dentry *dparent = dir_dentry;
1161         struct dentry *dchild;
1162         void *lock = NULL;
1163         char name[32];
1164         int len;
1165         ENTRY;
1166
1167         if (id == 0) {
1168                 CERROR("fatal: invalid object id 0\n");
1169                 RETURN(ERR_PTR(-ESTALE));
1170         }
1171
1172         len = sprintf(name, LPU64, id);
1173         if (dir_dentry == NULL) {
1174                 dparent = filter_parent_lock(obd, group, id, &lock);
1175                 if (IS_ERR(dparent)) {
1176                         CERROR("%s: error getting object "LPU64":"LPU64
1177                                " parent: rc %ld\n", obd->obd_name,
1178                                id, group, PTR_ERR(dparent));
1179                         RETURN(dparent);
1180                 }
1181         }
1182         CDEBUG(D_INODE, "looking up object O/%.*s/%s\n",
1183                dparent->d_name.len, dparent->d_name.name, name);
1184         dchild = /*ll_*/lookup_one_len(name, dparent, len);
1185         if (dir_dentry == NULL)
1186                 filter_parent_unlock(dparent, lock);
1187         if (IS_ERR(dchild)) {
1188                 CERROR("%s: child lookup error %ld\n", obd->obd_name,
1189                        PTR_ERR(dchild));
1190                 RETURN(dchild);
1191         }
1192
1193         if (dchild->d_inode != NULL && is_bad_inode(dchild->d_inode)) {
1194                 CERROR("%s: got bad inode "LPU64"\n", obd->obd_name, id);
1195                 f_dput(dchild);
1196                 RETURN(ERR_PTR(-ENOENT));
1197         }
1198
1199         CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1200                name, dchild, atomic_read(&dchild->d_count));
1201
1202         LASSERT(atomic_read(&dchild->d_count) > 0);
1203
1204         RETURN(dchild);
1205 }
1206
1207 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
1208                                   obd_id group)
1209 {
1210         struct lustre_handle lockh;
1211         int flags = LDLM_AST_DISCARD_DATA, rc;
1212         struct ldlm_res_id res_id = { .name = { objid, 0, group, 0 } };
1213         ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
1214
1215         ENTRY;
1216         /* Tell the clients that the object is gone now and that they should
1217          * throw away any cached pages. */
1218         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, res_id,
1219                               LDLM_EXTENT, &policy, LCK_PW,
1220                               &flags, filter_blocking_ast, ldlm_completion_ast,
1221                               NULL, NULL, NULL, 0, NULL, &lockh);
1222
1223         /* We only care about the side-effects, just drop the lock. */
1224         if (rc == ELDLM_OK)
1225                 ldlm_lock_decref(&lockh, LCK_PW);
1226
1227         RETURN(rc);
1228 }
1229
1230 /* Caller must hold LCK_PW on parent and push us into kernel context.
1231  * Caller is also required to ensure that dchild->d_inode exists. */
1232 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1233                                    struct dentry *dparent,
1234                                    struct dentry *dchild)
1235 {
1236         struct inode *inode = dchild->d_inode;
1237         int rc;
1238         ENTRY;
1239
1240         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1241                 CERROR("destroying objid %.*s nlink = %lu, count = %d\n",
1242                        dchild->d_name.len, dchild->d_name.name,
1243                        (unsigned long)inode->i_nlink,
1244                        atomic_read(&inode->i_count));
1245         }
1246
1247         rc = vfs_unlink(dparent->d_inode, dchild);
1248
1249         if (rc)
1250                 CERROR("error unlinking objid %.*s: rc %d\n",
1251                        dchild->d_name.len, dchild->d_name.name, rc);
1252
1253         RETURN(rc);
1254 }
1255
1256 static int filter_intent_policy(struct ldlm_namespace *ns,
1257                                 struct ldlm_lock **lockp, void *req_cookie,
1258                                 ldlm_mode_t mode, int flags, void *data)
1259 {
1260         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1261         struct ptlrpc_request *req = req_cookie;
1262         struct ldlm_lock *lock = *lockp, *l = NULL;
1263         struct ldlm_resource *res = lock->l_resource;
1264         ldlm_processing_policy policy;
1265         struct ost_lvb *res_lvb, *reply_lvb;
1266         struct ldlm_reply *rep;
1267         struct list_head *tmp;
1268         ldlm_error_t err;
1269         int tmpflags = 0, rc, repsize[2] = {sizeof(*rep), sizeof(*reply_lvb)};
1270         ENTRY;
1271
1272         policy = ldlm_get_processing_policy(res);
1273         LASSERT(policy != NULL);
1274         LASSERT(req != NULL);
1275
1276         rc = lustre_pack_reply(req, 2, repsize, NULL);
1277         if (rc)
1278                 RETURN(req->rq_status = rc);
1279
1280         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*rep));
1281         LASSERT(rep != NULL);
1282
1283         reply_lvb = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*reply_lvb));
1284         LASSERT(reply_lvb != NULL);
1285
1286         //fixup_handle_for_resent_req(req, lock, &lockh);
1287
1288         /* If we grant any lock at all, it will be a whole-file read lock.
1289          * Call the extent policy function to see if our request can be
1290          * granted, or is blocked. */
1291         lock->l_policy_data.l_extent.start = 0;
1292         lock->l_policy_data.l_extent.end = OBD_OBJECT_EOF;
1293         lock->l_req_mode = LCK_PR;
1294
1295         l_lock(&res->lr_namespace->ns_lock);
1296
1297         res->lr_tmp = &rpc_list;
1298         rc = policy(lock, &tmpflags, 0, &err);
1299         res->lr_tmp = NULL;
1300
1301         /* FIXME: we should change the policy function slightly, to not make
1302          * this list at all, since we just turn around and free it */
1303         while (!list_empty(&rpc_list)) {
1304                 struct ldlm_ast_work *w =
1305                         list_entry(rpc_list.next, struct ldlm_ast_work, w_list);
1306                 list_del(&w->w_list);
1307                 LDLM_LOCK_PUT(w->w_lock);
1308                 OBD_FREE(w, sizeof(*w));
1309         }
1310
1311         if (rc == LDLM_ITER_CONTINUE) {
1312                 /* The lock met with no resistance; we're finished. */
1313                 l_unlock(&res->lr_namespace->ns_lock);
1314                 RETURN(ELDLM_LOCK_REPLACED);
1315         }
1316
1317         /* Do not grant any lock, but instead send GL callbacks.  The extent
1318          * policy nicely created a list of all PW locks for us.  We will choose
1319          * the highest of those which are larger than the size in the LVB, if
1320          * any, and perform a glimpse callback. */
1321         down(&res->lr_lvb_sem);
1322         res_lvb = res->lr_lvb_data;
1323         LASSERT(res_lvb != NULL);
1324         *reply_lvb = *res_lvb;
1325         up(&res->lr_lvb_sem);
1326
1327         list_for_each(tmp, &res->lr_granted) {
1328                 struct ldlm_lock *tmplock =
1329                         list_entry(tmp, struct ldlm_lock, l_res_link);
1330
1331                 if (tmplock->l_granted_mode == LCK_PR)
1332                         continue;
1333
1334                 if (tmplock->l_policy_data.l_extent.end <= reply_lvb->lvb_size)
1335                         continue;
1336
1337                 if (l == NULL) {
1338                         l = LDLM_LOCK_GET(tmplock);
1339                         continue;
1340                 }
1341
1342                 if (l->l_policy_data.l_extent.start >
1343                     tmplock->l_policy_data.l_extent.start)
1344                         continue;
1345
1346                 LDLM_LOCK_PUT(l);
1347                 l = LDLM_LOCK_GET(tmplock);
1348         }
1349         l_unlock(&res->lr_namespace->ns_lock);
1350
1351         /* There were no PW locks beyond the size in the LVB; finished. */
1352         if (l == NULL)
1353                 RETURN(ELDLM_LOCK_ABORTED);
1354
1355         if (l->l_glimpse_ast == NULL) {
1356                 /* We are racing with unlink(); just return -ENOENT */
1357                 rep->lock_policy_res1 = -ENOENT;
1358                 goto out;
1359         }
1360
1361         LASSERTF(l->l_glimpse_ast != NULL, "l == %p", l);
1362
1363         rc = l->l_glimpse_ast(l, NULL); /* this will update the LVB */
1364         if (rc != 0 && res->lr_namespace->ns_lvbo &&
1365             res->lr_namespace->ns_lvbo->lvbo_update) {
1366                 res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
1367         }
1368
1369         down(&res->lr_lvb_sem);
1370         *reply_lvb = *res_lvb;
1371         up(&res->lr_lvb_sem);
1372 out:
1373         LDLM_LOCK_PUT(l);
1374
1375         RETURN(ELDLM_LOCK_ABORTED);
1376 }
1377
1378 static int filter_post_fs_cleanup(struct obd_device *obd)
1379 {
1380         int rc = 0;
1381
1382         rc = fsfilt_post_cleanup(obd);
1383
1384         RETURN(rc);
1385 }
1386
1387 static int filter_group_set_fs_flags(struct obd_device *obd, int group)
1388 {
1389         struct filter_obd *filter = &obd->u.filter;
1390         int rc = 0, i = 0;
1391         ENTRY;        
1392         
1393         /* zero group is not longer valid. */
1394         if (group== 0)
1395                 RETURN(rc); 
1396         for (i = 0; i < filter->fo_subdir_count; i++) {
1397                 struct dentry *dentry;
1398                 dentry = (filter->fo_subdirs + group)->dentry[i];
1399                 rc = fsfilt_set_fs_flags(obd, dentry->d_inode, 
1400                                          SM_DO_REC | SM_DO_COW);
1401                 if (rc)
1402                         RETURN(rc);
1403         }
1404         RETURN(rc);
1405 }
1406 static int filter_post_fs_setup(struct obd_device *obd)
1407 {
1408         struct filter_obd *filter = &obd->u.filter;
1409         int rc = 0, j = 0;
1410         struct llog_ctxt *ctxt = NULL;
1411
1412         rc = fsfilt_post_setup(obd, filter->fo_dentry_O);
1413         if (rc)
1414                 RETURN(rc);
1415         
1416         for (j = 0; j < filter->fo_group_count; j++) {
1417                 rc = filter_group_set_fs_flags(obd, j);
1418                 if (rc)
1419                         return rc;
1420         } 
1421
1422         fsfilt_get_reint_log_ctxt(obd, filter->fo_sb, &ctxt);
1423         if (ctxt) {
1424                 ctxt->loc_obd = obd;
1425                 ctxt->loc_idx = LLOG_REINT_ORIG_CTXT;
1426                 obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT] = ctxt;
1427         }
1428         fsfilt_set_ost_flags(obd, filter->fo_sb);
1429         return rc;
1430 }
1431
1432 /* mount the file system (secretly) */
1433 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1434                         char *option)
1435 {
1436         struct lustre_cfg *lcfg = buf;
1437         struct filter_obd *filter = &obd->u.filter;
1438         struct lvfs_obd_ctxt *lvfs_ctxt = NULL;
1439         struct vfsmount *mnt;
1440         char *str;
1441         char ns_name[48];
1442         int rc = 0, i;
1443         ENTRY;
1444
1445         if ((LUSTRE_CFG_BUFLEN(lcfg, 1)) < 1 || 
1446             (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1)) 
1447                 RETURN(-EINVAL);
1448
1449         obd->obd_fsops = fsfilt_get_ops(lustre_cfg_string(lcfg, 2));
1450         if (IS_ERR(obd->obd_fsops))
1451                 RETURN(PTR_ERR(obd->obd_fsops));
1452
1453         rc = lvfs_mount_fs(lustre_cfg_string(lcfg, 1), 
1454                            lustre_cfg_string(lcfg, 2), 
1455                            option, MS_NOATIME | MS_NODIRATIME, &lvfs_ctxt);
1456         if (rc) {
1457                 CERROR("lvfs_mount_fs failed: rc = %d\n", rc);
1458                 GOTO(err_ops, rc);
1459         }
1460         LASSERT(lvfs_ctxt);
1461
1462         mnt = lvfs_ctxt->loc_mnt;
1463         filter->fo_lvfs_ctxt = lvfs_ctxt;
1464
1465         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0 && lustre_cfg_buf(lcfg, 3)) {
1466                 str = lustre_cfg_string(lcfg, 3);
1467                 if (*str == 'f') {
1468                         obd->obd_replayable = 1;
1469                         obd_sync_filter = 1;
1470                         CWARN("%s: recovery enabled\n", obd->obd_name);
1471                 } else {
1472                         if (*str != 'n') {
1473                                 CERROR("unrecognised flag '%c'\n",
1474                                        *str);
1475                         }
1476                         // XXX Robert? Why do we get errors here
1477                         // GOTO(err_mntput, rc = -EINVAL);
1478                 }
1479         }
1480
1481         filter->fo_vfsmnt = mnt;
1482         filter->fo_sb = mnt->mnt_sb;
1483         filter->fo_fstype = mnt->mnt_sb->s_type->name;
1484         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1485
1486         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1487         obd->obd_lvfs_ctxt.pwdmnt = mnt;
1488         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
1489         obd->obd_lvfs_ctxt.fs = get_ds();
1490         obd->obd_lvfs_ctxt.cb_ops = filter_lvfs_ops;
1491
1492         ll_clear_rdonly(ll_sbdev(filter->fo_sb));
1493         
1494         rc = fsfilt_setup(obd, mnt->mnt_sb);
1495         if (rc)
1496                 GOTO(err_mntput, rc);
1497
1498         sema_init(&filter->fo_init_lock, 1);
1499         filter->fo_committed_group = 0;
1500         rc = filter_prep(obd);
1501         if (rc)
1502                 GOTO(err_mntput, rc);
1503
1504         filter->fo_destroys_in_progress = 0;
1505         for (i = 0; i < 32; i++)
1506                 sema_init(&filter->fo_create_locks[i], 1);
1507
1508         spin_lock_init(&filter->fo_translock);
1509         spin_lock_init(&filter->fo_objidlock);
1510         INIT_LIST_HEAD(&filter->fo_export_list);
1511         sema_init(&filter->fo_alloc_lock, 1);
1512         spin_lock_init(&filter->fo_r_pages.oh_lock);
1513         spin_lock_init(&filter->fo_w_pages.oh_lock);
1514         spin_lock_init(&filter->fo_r_discont_pages.oh_lock);
1515         spin_lock_init(&filter->fo_w_discont_pages.oh_lock);
1516         spin_lock_init(&filter->fo_r_discont_blocks.oh_lock);
1517         spin_lock_init(&filter->fo_w_discont_blocks.oh_lock);
1518         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
1519
1520         INIT_LIST_HEAD(&filter->fo_llog_list);
1521         spin_lock_init(&filter->fo_llog_list_lock);
1522
1523         sprintf(ns_name, "filter-%s", obd->obd_uuid.uuid);
1524         obd->obd_namespace = ldlm_namespace_new(ns_name, LDLM_NAMESPACE_SERVER);
1525
1526         if (obd->obd_namespace == NULL)
1527                 GOTO(err_post, rc = -ENOMEM);
1528         obd->obd_namespace->ns_lvbp = obd;
1529         obd->obd_namespace->ns_lvbo = &filter_lvbo;
1530         ldlm_register_intent(obd->obd_namespace, filter_intent_policy);
1531
1532         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1533                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1534
1535         rc = obd_llog_cat_initialize(obd, &obd->obd_llogs, 1, CATLIST);
1536         if (rc) {
1537                 CERROR("failed to setup llogging subsystems\n");
1538                 GOTO(err_post, rc);
1539         }
1540         RETURN(0);
1541
1542 err_post:
1543         filter_post(obd);
1544 err_mntput:
1545         unlock_kernel();
1546         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1547         filter->fo_sb = 0;
1548         lock_kernel();
1549 err_ops:
1550         fsfilt_put_ops(obd->obd_fsops);
1551         return rc;
1552 }
1553
1554 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1555 {
1556         struct lprocfs_static_vars lvars;
1557         int rc;
1558
1559         lprocfs_init_vars(filter, &lvars);
1560         rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1561         if (rc != 0)
1562                 return rc;
1563
1564         rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1565         if (rc != 0)
1566                 return rc;
1567
1568         /* Init obdfilter private stats here */
1569         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1570                              LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1571         lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1572                              LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1573
1574         return lproc_filter_attach_seqstat(obd);
1575 }
1576
1577 static int filter_detach(struct obd_device *dev)
1578 {
1579         lprocfs_free_obd_stats(dev);
1580         return lprocfs_obd_detach(dev);
1581 }
1582
1583 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1584 {
1585         struct lustre_cfg* lcfg = buf;
1586         int rc;
1587         ENTRY;
1588         /* all mount options including errors=remount-ro and asyncdel are passed
1589          * using 4th lcfg param. And it is good, finally we have got rid of
1590          * hardcoded fs types in the code. */
1591         rc = filter_common_setup(obd, len, buf, lustre_cfg_buf(lcfg, 4));
1592         if (rc)
1593                 RETURN(rc);
1594         rc = filter_post_fs_setup(obd);
1595         RETURN(rc);
1596 }
1597
1598 static int filter_cleanup(struct obd_device *obd, int flags)
1599 {
1600         struct filter_obd *filter = &obd->u.filter;
1601         ll_sbdev_type save_dev;
1602         ENTRY;
1603
1604         if (flags & OBD_OPT_FAILOVER)
1605                 CERROR("%s: shutting down for failover; client state will"
1606                        " be preserved.\n", obd->obd_name);
1607
1608         if (!list_empty(&obd->obd_exports)) {
1609                 CERROR("%s: still has clients!\n", obd->obd_name);
1610                 class_disconnect_exports(obd, flags);
1611                 if (!list_empty(&obd->obd_exports)) {
1612                         CERROR("still has exports after forced cleanup?\n");
1613                         RETURN(-EBUSY);
1614                 }
1615         }
1616
1617         target_cleanup_recovery(obd);
1618         
1619         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1620
1621         if (filter->fo_sb == NULL)
1622                 RETURN(0);
1623
1624         save_dev = ll_sbdev(filter->fo_sb);
1625         filter_post_fs_cleanup(obd);
1626         filter_post(obd);
1627
1628         shrink_dcache_parent(filter->fo_sb->s_root);
1629         filter->fo_sb = 0;
1630
1631         unlock_kernel();
1632         lvfs_umount_fs(filter->fo_lvfs_ctxt);
1633         //destroy_buffers(filter->fo_sb->s_dev);
1634         filter->fo_sb = NULL;
1635         fsfilt_put_ops(obd->obd_fsops);
1636         lock_kernel();
1637
1638         ll_clear_rdonly(save_dev);
1639
1640         RETURN(0);
1641 }
1642
1643 static int filter_connect_post(struct obd_export *exp, unsigned initial,
1644                                unsigned long connect_flags)
1645 {
1646         struct obd_device *obd = exp->exp_obd;
1647         struct filter_export_data *fed;
1648         char str[PTL_NALFMT_SIZE];
1649         struct obd_llogs *llog;
1650         struct llog_ctxt *ctxt;
1651         int rc;
1652         ENTRY;
1653
1654         fed = &exp->exp_filter_data;
1655         if (fed->fed_group < FILTER_MIN_GROUPS)
1656                 RETURN(0);
1657
1658         /* initialize llogs for connections from MDS */
1659         llog = filter_grab_llog_for_group(obd, fed->fed_group, exp);
1660         LASSERT(llog != NULL);
1661
1662         ctxt = llog_get_context(llog, LLOG_UNLINK_REPL_CTXT);
1663         LASSERT(ctxt != NULL);
1664
1665         rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
1666         portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1667                         exp->exp_connection->c_peer.peer_id.nid, str);
1668         CDEBUG(D_OTHER, "%s: init llog ctxt for export "LPX64"/%s, group %d\n",
1669                obd->obd_name, exp->exp_connection->c_peer.peer_id.nid,
1670                str, fed->fed_group);
1671
1672         RETURN(rc);
1673 }
1674
1675 /* nearly identical to mds_connect */
1676 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1677                           struct obd_uuid *cluuid,
1678                           struct obd_connect_data *data,
1679                           unsigned long connect_flags)
1680 {
1681         struct obd_export *exp;
1682         struct filter_export_data *fed;
1683         struct filter_client_data *fcd = NULL;
1684         struct filter_obd *filter = &obd->u.filter;
1685         struct lvfs_run_ctxt saved;
1686         int rc, group;
1687         ENTRY;
1688
1689         if (conn == NULL || obd == NULL || cluuid == NULL)
1690                 RETURN(-EINVAL);
1691
1692         rc = class_connect(conn, obd, cluuid);
1693         if (rc)
1694                 RETURN(rc);
1695         exp = class_conn2export(conn);
1696         LASSERT(exp != NULL);
1697
1698         fed = &exp->exp_filter_data;
1699
1700         spin_lock_init(&fed->fed_lock);
1701
1702        /* connection from MDS */
1703         group = connect_flags;
1704         if (obd->obd_replayable) {
1705                 OBD_ALLOC(fcd, sizeof(*fcd));
1706                 if (!fcd) {
1707                         CERROR("filter: out of memory for client data\n");
1708                         GOTO(cleanup, rc = -ENOMEM);
1709                 }
1710
1711                 memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1712                 fed->fed_fcd = fcd;
1713                 fed->fed_fcd->fcd_group = group;
1714                 rc = filter_client_add(obd, filter, fed, -1);
1715                 if (rc)
1716                         GOTO(cleanup, rc);
1717         }
1718         CWARN("%s: Received MDS connection ("LPX64"); group %d\n",
1719               obd->obd_name, exp->exp_handle.h_cookie, group);
1720  
1721         if (group == 0)
1722                 GOTO(cleanup, rc);
1723         
1724         if (fed->fed_group != 0 && fed->fed_group != group) {
1725                 char str[PTL_NALFMT_SIZE];
1726                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
1727                                 exp->exp_connection->c_peer.peer_id.nid, str);
1728                 CERROR("!!! This export (nid "LPX64"/%s) used object group %d "
1729                        "earlier; now it's trying to use group %d!  This could "
1730                        "be a bug in the MDS.  Tell CFS.\n",
1731                        exp->exp_connection->c_peer.peer_id.nid, str,
1732                        fed->fed_group, group);
1733                 GOTO(cleanup, rc = -EPROTO);
1734         }
1735         fed->fed_group = group;
1736
1737         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1738         rc = filter_read_groups(obd, group, 1);
1739         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1740         if (rc != 0) {
1741                 CERROR("can't read group %u\n", group);
1742                 GOTO(cleanup, rc);
1743         }
1744         rc = filter_group_set_fs_flags(obd, group);
1745         if (rc != 0) {
1746                 CERROR("can't set kml flags %u\n", group);
1747                 GOTO(cleanup, rc);
1748         }
1749
1750 cleanup:
1751         if (rc) {
1752                 if (fcd)
1753                         OBD_FREE(fcd, sizeof(*fcd));
1754                 class_disconnect(exp, 0);
1755         } else {
1756                 class_export_put(exp);
1757         }
1758         return rc;
1759 }
1760
1761 static int filter_precleanup(struct obd_device *obd, int flags)
1762 {
1763         struct filter_group_llog *log;
1764         struct filter_obd *filter;
1765         int rc = 0;
1766         ENTRY;
1767
1768         filter = &obd->u.filter;
1769
1770         spin_lock(&filter->fo_llog_list_lock);
1771         while (!list_empty(&filter->fo_llog_list)) {
1772                 log = list_entry(filter->fo_llog_list.next,
1773                                  struct filter_group_llog, list);
1774                 list_del(&log->list);
1775                 spin_unlock(&filter->fo_llog_list_lock);
1776
1777                 rc = obd_llog_finish(obd, log->llogs, 0);
1778                 if (rc)
1779                         CERROR("failed to cleanup llogging subsystem for %u\n",
1780                                 log->group);
1781                 OBD_FREE(log->llogs, sizeof(*(log->llogs)));
1782                 OBD_FREE(log, sizeof(*log));
1783                 spin_lock(&filter->fo_llog_list_lock);
1784         }
1785         spin_unlock(&filter->fo_llog_list_lock);
1786
1787         rc = obd_llog_finish(obd, &obd->obd_llogs, 0);
1788         if (rc)
1789                 CERROR("failed to cleanup llogging subsystem\n");
1790
1791         RETURN(rc);
1792 }
1793
1794 /* Do extra sanity checks for grant accounting.  We do this at connect,
1795  * disconnect, and statfs RPC time, so it shouldn't be too bad.  We can
1796  * always get rid of it or turn it off when we know accounting is good. */
1797 static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
1798 {
1799         struct filter_export_data *fed;
1800         struct obd_export *exp;
1801         obd_size maxsize = obd->obd_osfs.os_blocks * obd->obd_osfs.os_bsize;
1802         obd_size tot_dirty = 0, tot_pending = 0, tot_granted = 0;
1803         obd_size fo_tot_dirty, fo_tot_pending, fo_tot_granted;
1804         int level = D_CACHE;
1805
1806         if (list_empty(&obd->obd_exports))
1807                 return;
1808
1809         spin_lock(&obd->obd_osfs_lock);
1810         spin_lock(&obd->obd_dev_lock);
1811         list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
1812                 fed = &exp->exp_filter_data;
1813                 if (fed->fed_grant < 0 || fed->fed_pending < 0 ||
1814                     fed->fed_dirty < 0)
1815                         level = D_ERROR;
1816                 if (maxsize > 0) { /* we may not have done a statfs yet */
1817                         LASSERTF(fed->fed_grant + fed->fed_pending <= maxsize,
1818                                  "cli %s/%p %ld+%ld > "LPU64"\n",
1819                                  exp->exp_client_uuid.uuid, exp,
1820                                  fed->fed_grant, fed->fed_pending, maxsize);
1821                         LASSERTF(fed->fed_dirty <= maxsize,
1822                                  "cli %s/%p %ld > "LPU64"\n",
1823                                  exp->exp_client_uuid.uuid, exp,
1824                                  fed->fed_dirty, maxsize);
1825                 }
1826                 CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1827                        obd->obd_name, exp->exp_client_uuid.uuid, exp,
1828                        fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1829                 tot_granted += fed->fed_grant + fed->fed_pending;
1830                 tot_pending += fed->fed_pending;
1831                 tot_dirty += fed->fed_dirty;
1832         }
1833         fo_tot_granted = obd->u.filter.fo_tot_granted;
1834         fo_tot_pending = obd->u.filter.fo_tot_pending;
1835         fo_tot_dirty = obd->u.filter.fo_tot_dirty;
1836         spin_unlock(&obd->obd_dev_lock);
1837         spin_unlock(&obd->obd_osfs_lock);
1838
1839         /* Do these assertions outside the spinlocks so we don't kill system */
1840         if (tot_granted != fo_tot_granted)
1841                 CERROR("%s: tot_granted "LPU64" != fo_tot_granted "LPU64"\n",
1842                        func, tot_granted, fo_tot_granted);
1843         if (tot_pending != fo_tot_pending)
1844                 CERROR("%s: tot_pending "LPU64" != fo_tot_pending "LPU64"\n",
1845                        func, tot_pending, fo_tot_pending);
1846         if (tot_dirty != fo_tot_dirty)
1847                 CERROR("%s: tot_dirty "LPU64" != fo_tot_dirty "LPU64"\n",
1848                        func, tot_dirty, fo_tot_dirty);
1849         if (tot_pending > tot_granted)
1850                 CERROR("%s: tot_pending "LPU64" > tot_granted "LPU64"\n",
1851                        func, tot_pending, tot_granted);
1852         if (tot_granted > maxsize)
1853                 CERROR("%s: tot_granted "LPU64" > maxsize "LPU64"\n",
1854                        func, tot_granted, maxsize);
1855         if (tot_dirty > maxsize)
1856                 CERROR("%s: tot_dirty "LPU64" > maxsize "LPU64"\n",
1857                        func, tot_dirty, maxsize);
1858 }
1859
1860 /* Remove this client from the grant accounting totals.  We also remove
1861  * the export from the obd device under the osfs and dev locks to ensure
1862  * that the filter_grant_sanity_check() calculations are always valid.
1863  * The client should do something similar when it invalidates its import. */
1864 static void filter_grant_discard(struct obd_export *exp)
1865 {
1866         struct obd_device *obd = exp->exp_obd;
1867         struct filter_obd *filter = &obd->u.filter;
1868         struct filter_export_data *fed = &exp->exp_filter_data;
1869         int level = D_CACHE;
1870
1871         spin_lock(&obd->obd_osfs_lock);
1872         spin_lock(&exp->exp_obd->obd_dev_lock);
1873         list_del_init(&exp->exp_obd_chain);
1874         spin_unlock(&exp->exp_obd->obd_dev_lock);
1875
1876         if (fed->fed_dirty < 0 || fed->fed_grant < 0 || fed->fed_pending < 0)
1877                 level = D_ERROR;
1878         CDEBUG(level, "%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
1879                obd->obd_name, exp->exp_client_uuid.uuid, exp,
1880                fed->fed_dirty, fed->fed_pending, fed->fed_grant);
1881
1882         LASSERTF(filter->fo_tot_granted >= fed->fed_grant,
1883                  "%s: tot_granted "LPU64" cli %s/%p fed_grant %ld\n",
1884                  obd->obd_name, filter->fo_tot_granted,
1885                  exp->exp_client_uuid.uuid, exp, fed->fed_grant);
1886         filter->fo_tot_granted -= fed->fed_grant;
1887         LASSERTF(filter->fo_tot_pending >= fed->fed_pending,
1888                  "%s: tot_pending "LPU64" cli %s/%p fed_pending %ld\n",
1889                  obd->obd_name, filter->fo_tot_pending,
1890                  exp->exp_client_uuid.uuid, exp, fed->fed_pending);
1891         LASSERTF(filter->fo_tot_dirty >= fed->fed_dirty,
1892                  "%s: tot_dirty "LPU64" cli %s/%p fed_dirty %ld\n",
1893                  obd->obd_name, filter->fo_tot_dirty,
1894                  exp->exp_client_uuid.uuid, exp, fed->fed_dirty);
1895         filter->fo_tot_dirty -= fed->fed_dirty;
1896         fed->fed_dirty = 0;
1897         fed->fed_grant = 0;
1898
1899         spin_unlock(&obd->obd_osfs_lock);
1900 }
1901
1902 static int filter_destroy_export(struct obd_export *exp)
1903 {
1904         ENTRY;
1905
1906         if (exp->exp_filter_data.fed_pending)
1907                 CERROR("%s: cli %s/%p has %lu pending on destroyed export\n",
1908                        exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
1909                        exp, exp->exp_filter_data.fed_pending);
1910
1911         target_destroy_export(exp);
1912
1913         if (exp->exp_obd->obd_replayable)
1914                 filter_client_free(exp, exp->exp_flags);
1915
1916         filter_grant_discard(exp);
1917         if (!(exp->exp_flags & OBD_OPT_FORCE))
1918                 filter_grant_sanity_check(exp->exp_obd, __FUNCTION__);
1919
1920         RETURN(0);
1921 }
1922
1923 static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
1924 {
1925         struct filter_group_llog *fglog, *nlog;
1926         struct filter_obd *filter;
1927         int worked = 0, group;
1928         struct llog_ctxt *ctxt;
1929         ENTRY;
1930
1931         filter = &obd->u.filter;
1932
1933         /* we can't sync log holding spinlock. also, we do not want to get
1934          * into livelock. so we do following: loop over MDS's exports in
1935          * group order and skip already synced llogs -bzzz */
1936         do {
1937                 /* look for group with min. number, but > worked */
1938                 fglog = NULL;
1939                 group = 1 << 30;
1940                 spin_lock(&filter->fo_llog_list_lock);
1941                 list_for_each_entry(nlog, &filter->fo_llog_list, list) {
1942                        
1943                         if (nlog->group <= worked) {
1944                                 /* this group is already synced */
1945                                 continue;
1946                         }
1947         
1948                         if (group < nlog->group) {
1949                                 /* we have group with smaller number to sync */
1950                                 continue;
1951                         }
1952
1953                         /* store current minimal group */
1954                         fglog = nlog;
1955                         group = nlog->group;
1956                 }
1957                 spin_unlock(&filter->fo_llog_list_lock);
1958
1959                 if (fglog == NULL)
1960                         break;
1961
1962                 worked = fglog->group;
1963                 if (fglog->exp && (dexp == fglog->exp || dexp == NULL)) {
1964                         ctxt = llog_get_context(fglog->llogs,
1965                                         LLOG_UNLINK_REPL_CTXT);
1966                         LASSERT(ctxt != NULL);
1967                         llog_sync(ctxt, fglog->exp);
1968                 }
1969         } while (fglog != NULL);
1970 }
1971
1972 /* also incredibly similar to mds_disconnect */
1973 static int filter_disconnect(struct obd_export *exp, unsigned long flags)
1974 {
1975         struct obd_device *obd = exp->exp_obd;
1976         unsigned long irqflags;
1977         int rc;
1978         ENTRY;
1979
1980         LASSERT(exp);
1981         class_export_get(exp);
1982
1983         spin_lock_irqsave(&exp->exp_lock, irqflags);
1984         exp->exp_flags = flags;
1985         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
1986
1987         if (!(flags & OBD_OPT_FORCE))
1988                 filter_grant_sanity_check(obd, __FUNCTION__);
1989         filter_grant_discard(exp);
1990
1991         /* Disconnect early so that clients can't keep using export */
1992         rc = class_disconnect(exp, flags);
1993
1994         ldlm_cancel_locks_for_export(exp);
1995
1996         fsfilt_sync(obd, obd->u.filter.fo_sb);
1997
1998         /* flush any remaining cancel messages out to the target */
1999         filter_sync_llogs(obd, exp);
2000         class_export_put(exp);
2001         RETURN(rc);
2002 }
2003
2004 struct dentry *__filter_oa2dentry(struct obd_device *obd,
2005                                   struct obdo *oa, const char *what)
2006 {
2007         struct dentry *dchild = NULL;
2008         obd_gr group = 0;
2009
2010         if (oa->o_valid & OBD_MD_FLGROUP)
2011                 group = oa->o_gr;
2012
2013         dchild = filter_id2dentry(obd, NULL, group, oa->o_id);
2014
2015         if (IS_ERR(dchild)) {
2016                 CERROR("%s error looking up object: "LPU64"\n",
2017                        what, oa->o_id);
2018                 RETURN(dchild);
2019         }
2020
2021         if (dchild->d_inode == NULL) {
2022                 CERROR("%s: %s on non-existent object: "LPU64"\n",
2023                        obd->obd_name, what, oa->o_id);
2024                 f_dput(dchild);
2025                 RETURN(ERR_PTR(-ENOENT));
2026         }
2027
2028         return dchild;
2029 }
2030
2031 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
2032                           struct lov_stripe_md *md)
2033 {
2034         struct dentry *dentry = NULL;
2035         struct obd_device *obd;
2036         int rc = 0;
2037         ENTRY;
2038
2039         obd = class_exp2obd(exp);
2040         if (obd == NULL) {
2041                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2042                        exp->exp_handle.h_cookie);
2043                 RETURN(-EINVAL);
2044         }
2045
2046         dentry = filter_oa2dentry(obd, oa);
2047         if (IS_ERR(dentry))
2048                 RETURN(PTR_ERR(dentry));
2049
2050         /* Limit the valid bits in the return data to what we actually use */
2051         oa->o_valid = OBD_MD_FLID;
2052         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2053
2054         f_dput(dentry);
2055         RETURN(rc);
2056 }
2057
2058 /* this is called from filter_truncate() until we have filter_punch() */
2059 static int filter_setattr(struct obd_export *exp, struct obdo *oa,
2060                           struct lov_stripe_md *md, struct obd_trans_info *oti)
2061 {
2062         struct lvfs_run_ctxt saved;
2063         struct filter_obd *filter;
2064         struct dentry *dentry;
2065         struct iattr iattr;
2066         struct ldlm_res_id res_id = { .name = { oa->o_id, 0, oa->o_gr, 0 } };
2067         struct ldlm_resource *res;
2068         void *handle;
2069         int rc, rc2;
2070         ENTRY;
2071
2072         LASSERT(oti != NULL);
2073
2074         dentry = filter_oa2dentry(exp->exp_obd, oa);
2075         if (IS_ERR(dentry))
2076                 RETURN(PTR_ERR(dentry));
2077
2078         filter = &exp->exp_obd->u.filter;
2079
2080         iattr_from_obdo(&iattr, oa, oa->o_valid);
2081
2082         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2083         lock_kernel();
2084
2085         if (iattr.ia_valid & ATTR_SIZE)
2086                 down(&dentry->d_inode->i_sem);
2087         handle = fsfilt_start(exp->exp_obd, dentry->d_inode, FSFILT_OP_SETATTR,
2088                               oti);
2089         if (IS_ERR(handle))
2090                 GOTO(out_unlock, rc = PTR_ERR(handle));
2091
2092         /* XXX this could be a rwsem instead, if filter_preprw played along */
2093         if (iattr.ia_valid & ATTR_ATTR_FLAG)
2094                 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode, NULL,
2095                                       EXT3_IOC_SETFLAGS,
2096                                       (long)&iattr.ia_attr_flags);
2097         else
2098                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1);
2099         rc = filter_finish_transno(exp, oti, rc);
2100         rc2 = fsfilt_commit(exp->exp_obd, filter->fo_sb, dentry->d_inode, 
2101                             handle, exp->exp_sync);
2102         if (rc2) {
2103                 CERROR("error on commit, err = %d\n", rc2);
2104                 if (!rc)
2105                         rc = rc2;
2106         }
2107
2108         res = ldlm_resource_get(exp->exp_obd->obd_namespace, NULL,
2109                                 res_id, LDLM_EXTENT, 0);
2110         if (res != NULL) {
2111                 if (res->lr_namespace->ns_lvbo &&
2112                     res->lr_namespace->ns_lvbo->lvbo_update)
2113                         rc = res->lr_namespace->ns_lvbo->lvbo_update(res, NULL,
2114                                                                      0, 0);
2115                 ldlm_resource_putref(res);
2116         } else if (iattr.ia_valid & ATTR_SIZE) {
2117                 /* called from MDS. */
2118         }
2119
2120         oa->o_valid = OBD_MD_FLID;
2121         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2122
2123 out_unlock:
2124         if (iattr.ia_valid & ATTR_SIZE)
2125                 up(&dentry->d_inode->i_sem);
2126         unlock_kernel();
2127         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2128
2129         f_dput(dentry);
2130         RETURN(rc);
2131 }
2132
2133 /* XXX identical to osc_unpackmd */
2134 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2135                            struct lov_mds_md *lmm, int lmm_bytes)
2136 {
2137         int lsm_size;
2138         ENTRY;
2139
2140         if (lmm != NULL) {
2141                 if (lmm_bytes < sizeof (*lmm)) {
2142                         CERROR("lov_mds_md too small: %d, need %d\n",
2143                                lmm_bytes, (int)sizeof(*lmm));
2144                         RETURN(-EINVAL);
2145                 }
2146                 /* XXX LOV_MAGIC etc check? */
2147
2148                 if (lmm->lmm_object_id == cpu_to_le64(0)) {
2149                         CERROR("lov_mds_md: zero lmm_object_id\n");
2150                         RETURN(-EINVAL);
2151                 }
2152         }
2153
2154         lsm_size = lov_stripe_md_size(1);
2155         if (lsmp == NULL)
2156                 RETURN(lsm_size);
2157
2158         if (*lsmp != NULL && lmm == NULL) {
2159                 OBD_FREE(*lsmp, lsm_size);
2160                 *lsmp = NULL;
2161                 RETURN(0);
2162         }
2163
2164         if (*lsmp == NULL) {
2165                 OBD_ALLOC(*lsmp, lsm_size);
2166                 if (*lsmp == NULL)
2167                         RETURN(-ENOMEM);
2168
2169                 loi_init((*lsmp)->lsm_oinfo);
2170         }
2171
2172         if (lmm != NULL) {
2173                 /* XXX zero *lsmp? */
2174                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
2175                 LASSERT((*lsmp)->lsm_object_id);
2176         }
2177
2178         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
2179
2180         RETURN(lsm_size);
2181 }
2182
2183 static void filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
2184                                       struct filter_obd *filter)
2185 {
2186         struct obdo *doa = NULL;
2187         __u64 last, id;
2188         ENTRY;
2189         
2190         LASSERT(oa);
2191         LASSERT(oa->o_gr != 0);
2192         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2193
2194         doa = obdo_alloc();
2195         if (doa == NULL) {
2196                 CERROR("cannot allocate doa, error %d\n",
2197                        -ENOMEM);
2198                 EXIT;
2199                 return;
2200         }
2201
2202         doa->o_mode = S_IFREG;
2203         doa->o_gr = oa->o_gr;
2204         doa->o_valid = oa->o_valid & (OBD_MD_FLGROUP | OBD_MD_FLID);
2205
2206         set_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2207         down(&filter->fo_create_locks[doa->o_gr]);
2208         if (!test_bit(doa->o_gr, &filter->fo_destroys_in_progress)) {
2209                 CERROR("%s:["LPU64"] destroy_in_progress already cleared\n",
2210                        exp->exp_obd->obd_name, doa->o_gr);
2211                 up(&filter->fo_create_locks[doa->o_gr]);
2212                 GOTO(out_free_doa, 0);
2213         }
2214
2215         last = filter_last_id(filter, doa->o_gr);
2216         CWARN("%s:["LPU64"] deleting orphan objects from "LPU64" to "LPU64"\n",
2217               exp->exp_obd->obd_name, doa->o_gr, oa->o_id + 1, last);
2218         for (id = oa->o_id + 1; id <= last; id++) {
2219                 doa->o_id = id;
2220                 filter_destroy(exp, doa, NULL, NULL);
2221         }
2222
2223         CDEBUG(D_HA, "%s:["LPU64"] after destroy: set last_objids = "LPU64"\n",
2224                exp->exp_obd->obd_name, doa->o_gr, oa->o_id);
2225
2226         filter_set_last_id(filter, doa->o_gr, oa->o_id);
2227
2228         clear_bit(doa->o_gr, &filter->fo_destroys_in_progress);
2229         up(&filter->fo_create_locks[doa->o_gr]);
2230
2231         EXIT;
2232 out_free_doa:
2233         obdo_free(doa);
2234 }
2235
2236 /* returns a negative error or a nonnegative number of files to create */
2237 static int filter_should_precreate(struct obd_export *exp, struct obdo *oa,
2238                                    obd_gr group)
2239 {
2240         struct obd_device *obd = exp->exp_obd;
2241         struct filter_obd *filter = &obd->u.filter;
2242         int diff, rc;
2243         ENTRY;
2244
2245         diff = oa->o_id - filter_last_id(filter, oa->o_gr);
2246         CDEBUG(D_INFO, "filter_last_id() = "LPU64" -> diff = %d\n",
2247                filter_last_id(filter, oa->o_gr), diff);
2248
2249         /* delete orphans request */
2250         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
2251             (oa->o_flags & OBD_FL_DELORPHAN)) {
2252                 if (diff >= 0)
2253                         RETURN(diff);
2254                 if (-diff > OST_MAX_PRECREATE) {
2255                         CERROR("ignoring bogus orphan destroy request: obdid "
2256                                LPU64" last_id "LPU64"\n",
2257                                oa->o_id, filter_last_id(filter, oa->o_gr));
2258                         RETURN(-EINVAL);
2259                 }
2260                 filter_destroy_precreated(exp, oa, filter);
2261                 rc = filter_update_last_objid(obd, group, 0);
2262                 if (rc)
2263                         CERROR("unable to write lastobjid, but orphans"
2264                                "were deleted\n");
2265                 RETURN(0);
2266         } else {
2267                 /* only precreate if group == 0 and o_id is specfied */
2268                 if (!(oa->o_valid & OBD_FL_DELORPHAN) &&
2269                     (/*group != 0 ||*/ oa->o_id == 0))
2270                         RETURN(1);
2271
2272                 LASSERTF(diff >= 0, LPU64" - "LPU64" = %d\n", oa->o_id,
2273                          filter_last_id(filter, oa->o_gr), diff);
2274                 RETURN(diff);
2275         }
2276 }
2277 static int filter_precreate_rec(struct obd_device *obd, struct dentry *dentry, 
2278                                 int *number, struct obdo *oa)
2279 {
2280         int rc;
2281         ENTRY;
2282
2283         rc = fsfilt_precreate_rec(obd, dentry, number, oa);
2284
2285         RETURN(rc);
2286 }
2287
2288 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
2289                          unsigned long max_age)
2290 {
2291         struct filter_obd *filter = &obd->u.filter;
2292         int blockbits = filter->fo_sb->s_blocksize_bits;
2293         int rc;
2294         ENTRY;
2295
2296         /* at least try to account for cached pages.  its still racey and
2297          * might be under-reporting if clients haven't announced their
2298          * caches with brw recently */
2299         spin_lock(&obd->obd_osfs_lock);
2300         rc = fsfilt_statfs(obd, filter->fo_sb, max_age);
2301         memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
2302         spin_unlock(&obd->obd_osfs_lock);
2303
2304         CDEBUG(D_SUPER | D_CACHE, "blocks cached "LPU64" granted "LPU64
2305                " pending "LPU64" free "LPU64" avail "LPU64"\n",
2306                filter->fo_tot_dirty, filter->fo_tot_granted,
2307                filter->fo_tot_pending,
2308                osfs->os_bfree << blockbits, osfs->os_bavail << blockbits);
2309
2310         filter_grant_sanity_check(obd, __FUNCTION__);
2311
2312         osfs->os_bavail -= min(osfs->os_bavail,
2313                                (filter->fo_tot_dirty + filter->fo_tot_pending +
2314                                 osfs->os_bsize -1) >> blockbits);
2315
2316         RETURN(rc);
2317 }
2318
2319 /* We rely on the fact that only one thread will be creating files in a given
2320  * group at a time, which is why we don't need an atomic filter_get_new_id.
2321  * Even if we had that atomic function, the following race would exist:
2322  *
2323  * thread 1: gets id x from filter_next_id
2324  * thread 2: gets id (x + 1) from filter_next_id
2325  * thread 2: creates object (x + 1)
2326  * thread 1: tries to create object x, gets -ENOSPC
2327  */
2328 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
2329                             obd_gr group, int *num)
2330 {
2331         struct dentry *dchild = NULL, *dparent = NULL;
2332         int err = 0, rc = 0, recreate_obj = 0, i;
2333         struct filter_obd *filter;
2334         void *handle = NULL;
2335         void *lock = NULL;
2336         struct obd_statfs *osfs;
2337         unsigned long enough_time = jiffies + (obd_timeout * HZ) / 3;
2338         __u64 next_id;
2339         ENTRY;
2340
2341         filter = &obd->u.filter;
2342
2343         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
2344             (oa->o_flags & OBD_FL_RECREATE_OBJS)) {
2345                 recreate_obj = 1;
2346         } else {
2347                 OBD_ALLOC(osfs, sizeof(*osfs));
2348                 if (osfs == NULL)
2349                         RETURN(-ENOMEM);
2350                 rc = filter_statfs(obd, osfs, jiffies-HZ);
2351                 if (rc == 0 && osfs->os_bavail < (osfs->os_blocks >> 10)) {
2352                         CDEBUG(D_HA, "OST out of space! avail "LPU64"\n",
2353                               osfs->os_bavail<<filter->fo_sb->s_blocksize_bits);
2354                         *num = 0;
2355                         rc = -ENOSPC;
2356                 }
2357                 OBD_FREE(osfs, sizeof(*osfs));
2358                 if (rc) {
2359                         RETURN(rc);
2360                 }
2361         }
2362
2363         CDEBUG(D_HA, "%s: precreating %d objects\n", obd->obd_name, *num);
2364
2365         down(&filter->fo_create_locks[group]);
2366
2367         for (i = 0; i < *num && err == 0; i++) {
2368                 int cleanup_phase = 0;
2369
2370                 if (test_bit(group, &filter->fo_destroys_in_progress)) {
2371                         CWARN("%s: precreate aborted by destroy\n",
2372                               obd->obd_name);
2373                         break;
2374                 }
2375
2376                 if (recreate_obj) {
2377                         __u64 last_id;
2378                         next_id = oa->o_id;
2379                         last_id = filter_last_id(filter, group);
2380                         if (next_id > last_id) {
2381                                 CERROR("Error: Trying to recreate obj greater"
2382                                        "than last id "LPD64" > "LPD64"\n",
2383                                        next_id, last_id);
2384                                 GOTO(cleanup, rc = -EINVAL);
2385                         }
2386                 } else {
2387                         next_id = filter_last_id(filter, group) + 1;
2388                 }
2389
2390                 CDEBUG(D_INFO, "precreate objid "LPU64"\n", next_id);
2391
2392                 dparent = filter_parent_lock(obd, group, next_id, &lock);
2393                 if (IS_ERR(dparent))
2394                         GOTO(cleanup, rc = PTR_ERR(dparent));
2395                 cleanup_phase = 1;
2396
2397                 /*only do precreate rec record. so clean kml flags here*/
2398                 fsfilt_clear_fs_flags(obd, dparent->d_inode, SM_DO_REC);
2399
2400                 dchild = filter_id2dentry(obd, dparent, group, next_id);
2401                 if (IS_ERR(dchild))
2402                         GOTO(cleanup, rc = PTR_ERR(dchild));
2403                 cleanup_phase = 2;
2404
2405                 if (dchild->d_inode != NULL) {
2406                         /* This would only happen if lastobjid was bad on disk*/
2407                         /* Could also happen if recreating missing obj but
2408                          * already exists
2409                          */
2410                         if (recreate_obj) {
2411                                 CERROR("%s: recreating existing object %.*s?\n",
2412                                        obd->obd_name, dchild->d_name.len,
2413                                        dchild->d_name.name);
2414                         } else {
2415                                 CERROR("%s: Serious error: objid %.*s already "
2416                                        "exists; is this filesystem corrupt?\n",
2417                                        obd->obd_name, dchild->d_name.len,
2418                                        dchild->d_name.name);
2419                                 LBUG();
2420                         }
2421                         GOTO(cleanup, rc = -EEXIST);
2422                 }
2423
2424                 handle = fsfilt_start_log(obd, dparent->d_inode,
2425                                           FSFILT_OP_CREATE, NULL, 1);
2426                 if (IS_ERR(handle))
2427                         GOTO(cleanup, rc = PTR_ERR(handle));
2428                 cleanup_phase = 3;
2429
2430                 rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
2431                 if (rc) {
2432                         CERROR("create failed rc = %d\n", rc);
2433                         GOTO(cleanup, rc);
2434                 }
2435
2436                 if (!recreate_obj) {
2437                         filter_set_last_id(filter, group, next_id);
2438                         err = filter_update_last_objid(obd, group, 0);
2439                         if (err)
2440                                 CERROR("unable to write lastobjid "
2441                                        "but file created\n");
2442                 }
2443                 fsfilt_set_fs_flags(obd, dparent->d_inode, SM_DO_REC);
2444         
2445         cleanup:
2446                 switch(cleanup_phase) {
2447                 case 3:
2448                         err = fsfilt_commit(obd, filter->fo_sb,
2449                                             dparent->d_inode, handle, 0);
2450                         if (err) {
2451                                 CERROR("error on commit, err = %d\n", err);
2452                                 if (!rc)
2453                                         rc = err;
2454                         }
2455                 case 2:
2456                         f_dput(dchild);
2457                 case 1:
2458                         filter_parent_unlock(dparent, lock);
2459                 case 0:
2460                         break;
2461                 }
2462
2463                 if (rc)
2464                         break;
2465                 if (time_after(jiffies, enough_time)) {
2466                         CDEBUG(D_INODE,"%s: precreate slow - want %d got %d \n",
2467                                obd->obd_name, *num, i);
2468                         break;
2469                 }
2470         }
2471
2472         *num = i;
2473
2474         /* check if we have an error after ll_vfs_create(). It is possible that
2475          * there will be say -ENOSPC and we will leak it. */
2476         if (rc == 0)
2477                 rc = filter_precreate_rec(obd, dparent, num, oa);
2478
2479         up(&filter->fo_create_locks[group]);
2480
2481         CDEBUG(D_HA, "%s: server last_objid for group "LPU64": "LPU64"\n",
2482                obd->obd_name, group, filter->fo_last_objids[group]);
2483
2484         CDEBUG(D_HA, "%s: filter_precreate() created %d objects\n",
2485                obd->obd_name, i);
2486
2487         RETURN(rc);
2488 }
2489
2490 static int filter_create(struct obd_export *exp, struct obdo *oa,
2491                          void *acl, int acl_size,
2492                          struct lov_stripe_md **ea, struct obd_trans_info *oti)
2493 {
2494         struct obd_device *obd = NULL;
2495         struct filter_obd *filter;
2496         struct lvfs_run_ctxt saved;
2497         struct lov_stripe_md *lsm = NULL;
2498         struct filter_export_data *fed;
2499         char str[PTL_NALFMT_SIZE];
2500         int group = oa->o_gr, rc = 0, diff, recreate_objs = 0;
2501         ENTRY;
2502
2503         LASSERT(acl == NULL && acl_size == 0);
2504
2505         if (!(oa->o_valid & OBD_MD_FLGROUP) || group == 0) {
2506                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2507                                 exp->exp_connection->c_peer.peer_id.nid, str);
2508                 CERROR("!!! nid "LPX64"/%s sent invalid object group %d\n",
2509                        exp->exp_connection->c_peer.peer_id.nid, str, group);
2510                 RETURN(-EINVAL);
2511         }
2512
2513         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
2514             (oa->o_flags & OBD_FL_RECREATE_OBJS))
2515                 recreate_objs = 1;
2516
2517         obd = exp->exp_obd;
2518         fed = &exp->exp_filter_data;
2519         filter = &obd->u.filter;
2520
2521         if (fed->fed_group != group && !recreate_objs &&
2522             !(oa->o_valid & OBD_MD_REINT)) {
2523                 portals_nid2str(exp->exp_connection->c_peer.peer_ni->pni_number,
2524                                 exp->exp_connection->c_peer.peer_id.nid, str);
2525                 CERROR("!!! This export (nid "LPX64"/%s) used object group %d "
2526                        "earlier; now it's trying to use group %d!  This could "
2527                        "be a bug in the MDS.  Tell CFS.\n",
2528                        exp->exp_connection->c_peer.peer_id.nid, str,
2529                        fed->fed_group, group);
2530                 RETURN(-ENOTUNIQ);
2531         }
2532
2533         CDEBUG(D_INFO, "filter_create(od->o_gr=%d,od->o_id="LPU64")\n",
2534                group, oa->o_id);
2535         if (ea != NULL) {
2536                 lsm = *ea;
2537                 if (lsm == NULL) {
2538                         rc = obd_alloc_memmd(exp, &lsm);
2539                         if (rc < 0)
2540                                 RETURN(rc);
2541                 }
2542         }
2543
2544         obd = exp->exp_obd;
2545         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2546
2547         if (oa->o_valid & OBD_MD_REINT) {
2548                 int num = *((int*)oa->o_inline);  
2549                 rc = filter_precreate(obd, oa, oa->o_gr, &num);
2550         } else if (recreate_objs) {
2551                 if (oa->o_id > filter_last_id(&obd->u.filter, group)) {
2552                         CERROR("recreate objid "LPU64" > last id "LPU64"\n",
2553                                oa->o_id, filter_last_id(&obd->u.filter, group));
2554                         rc = -EINVAL;
2555                 } else {
2556                         diff = 1;
2557                         rc = filter_precreate(obd, oa, group, &diff);
2558                 }
2559         } else {
2560                 diff = filter_should_precreate(exp, oa, group);
2561                 if (diff > 0) {
2562                         oa->o_id = filter_last_id(&obd->u.filter, group);
2563                         rc = filter_precreate(obd, oa, group, &diff);
2564                         oa->o_id = filter_last_id(&obd->u.filter, oa->o_gr);
2565                         oa->o_valid = OBD_MD_FLID;
2566                 }
2567         }
2568
2569         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2570         if (rc && ea != NULL && *ea != lsm) {
2571                 obd_free_memmd(exp, &lsm);
2572         } else if (rc == 0 && ea != NULL) {
2573                 /* XXX LOV STACKING: the lsm that is passed to us from
2574                  * LOV does not have valid lsm_oinfo data structs, so
2575                  * don't go touching that.  This needs to be fixed in a
2576                  * big way. */
2577                 lsm->lsm_object_id = oa->o_id;
2578                 lsm->lsm_object_gr = oa->o_gr;
2579                 *ea = lsm;
2580         }
2581
2582         RETURN(rc);
2583 }
2584
2585 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
2586                           struct lov_stripe_md *ea, struct obd_trans_info *oti)
2587 {
2588         int rc, rc2, cleanup_phase = 0, have_prepared = 0;
2589         struct dentry *dchild = NULL, *dparent = NULL;
2590         struct llog_cookie *fcc = NULL;
2591         struct lvfs_run_ctxt saved;
2592         struct filter_obd *filter;
2593         struct obd_device *obd;
2594         void *handle = NULL;
2595         void *lock = NULL;
2596         struct iattr iattr;
2597         ENTRY;
2598
2599         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2600
2601         obd = exp->exp_obd;
2602         filter = &obd->u.filter;
2603
2604         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2605
2606  acquire_locks:
2607         dparent = filter_parent_lock(obd, oa->o_gr, oa->o_id, &lock);
2608         if (IS_ERR(dparent))
2609                 GOTO(cleanup, rc = PTR_ERR(dparent));
2610         cleanup_phase = 1;
2611
2612         dchild = filter_id2dentry(obd, dparent, oa->o_gr, oa->o_id);
2613         if (IS_ERR(dchild))
2614                 GOTO(cleanup, rc = PTR_ERR(dchild));
2615         cleanup_phase = 2;
2616
2617         if (dchild->d_inode == NULL) {
2618                 CDEBUG(D_INODE, "destroying non-existent object "LPU64"\n",
2619                        oa->o_id);
2620                 GOTO(cleanup, rc = -ENOENT);
2621         }
2622
2623         if (!have_prepared) {
2624                 /* If we're really going to destroy the object, get ready
2625                  * by getting the clients to discard their cached data.
2626                  *
2627                  * We have to drop the parent lock, because
2628                  * filter_prepare_destroy will acquire a PW on the object, and
2629                  * we don't want to deadlock with an incoming write to the
2630                  * object, which has the extent PW and then wants to get the
2631                  * parent dentry to do the lookup.
2632                  *
2633                  * We dput the child because it's not worth the extra
2634                  * complication of condition the above code to skip it on the
2635                  * second time through. */
2636                 f_dput(dchild);
2637                 filter_parent_unlock(dparent, lock);
2638
2639                 filter_prepare_destroy(obd, oa->o_id, oa->o_gr);
2640                 have_prepared = 1;
2641                 goto acquire_locks;
2642         }
2643
2644         /* Our MDC connection is established by the MDS to us */
2645         if (oa->o_valid & OBD_MD_FLCOOKIE) {
2646                 OBD_ALLOC(fcc, sizeof(*fcc));
2647                 if (fcc != NULL)
2648                         memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
2649         }
2650
2651         /* we're gonna truncate it first in order to avoid possible
2652          * deadlock:
2653          *      P1                      P2
2654          * open trasaction      open transaction
2655          * down(i_zombie)       down(i_zombie)
2656          *                      restart transaction
2657          * (see BUG 4180) -bzzz
2658          */
2659         down(&dchild->d_inode->i_sem);
2660         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_SETATTR,NULL,1);
2661         if (IS_ERR(handle)) {
2662                 up(&dchild->d_inode->i_sem);
2663                 GOTO(cleanup, rc = PTR_ERR(handle));
2664         }
2665
2666         iattr.ia_valid = ATTR_SIZE;
2667         iattr.ia_size = 0;
2668         rc = fsfilt_setattr(obd, dchild, handle, &iattr, 1);
2669
2670         rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode, handle, 0);
2671         up(&dchild->d_inode->i_sem);
2672         if (rc)
2673                 GOTO(cleanup, rc);
2674         if (rc2)
2675                 GOTO(cleanup, rc = rc2);
2676
2677         handle = fsfilt_start_log(obd, dparent->d_inode,FSFILT_OP_UNLINK,oti,1);
2678         if (IS_ERR(handle))
2679                 GOTO(cleanup, rc = PTR_ERR(handle));
2680
2681         cleanup_phase = 3;
2682
2683         rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
2684
2685 cleanup:
2686         switch(cleanup_phase) {
2687         case 3:
2688                 if (fcc != NULL) {
2689                         fsfilt_add_journal_cb(obd, filter->fo_sb, 0,
2690                                               oti ? oti->oti_handle : handle,
2691                                               filter_cancel_cookies_cb, fcc);
2692                 }
2693                 rc = filter_finish_transno(exp, oti, rc);
2694                 rc2 = fsfilt_commit(obd, filter->fo_sb, dparent->d_inode, 
2695                                     handle, exp->exp_sync);
2696                 if (rc2) {
2697                         CERROR("error on commit, err = %d\n", rc2);
2698                         if (!rc)
2699                                 rc = rc2;
2700                 }
2701         case 2:
2702                 f_dput(dchild);
2703         case 1:
2704                 filter_parent_unlock(dparent, lock);
2705         case 0:
2706                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2707                 break;
2708         default:
2709                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2710                 LBUG();
2711         }
2712
2713         RETURN(rc);
2714 }
2715
2716 /* NB start and end are used for punch, but not truncate */
2717 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
2718                            struct lov_stripe_md *lsm,
2719                            obd_off start, obd_off end,
2720                            struct obd_trans_info *oti)
2721 {
2722         int error;
2723         ENTRY;
2724
2725         if (end != OBD_OBJECT_EOF)
2726                 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
2727                        end);
2728
2729         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = "LPU64", "
2730                "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
2731         oa->o_size = start;
2732         error = filter_setattr(exp, oa, NULL, oti);
2733         RETURN(error);
2734 }
2735
2736 static int filter_sync(struct obd_export *exp, struct obdo *oa,
2737                        struct lov_stripe_md *lsm, obd_off start, obd_off end)
2738 {
2739         struct obd_device *obd = exp->exp_obd;
2740         struct lvfs_run_ctxt saved;
2741         struct filter_obd *filter;
2742         struct dentry *dentry;
2743         int rc, rc2;
2744         ENTRY;
2745
2746         filter = &obd->u.filter;
2747
2748         /* an objid of zero is taken to mean "sync whole filesystem" */
2749         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
2750                 rc = fsfilt_sync(obd, filter->fo_sb);
2751                 /* flush any remaining cancel messages out to the target */
2752                 filter_sync_llogs(obd, NULL);
2753                 RETURN(rc);
2754         }
2755
2756         dentry = filter_oa2dentry(obd, oa);
2757         if (IS_ERR(dentry))
2758                 RETURN(PTR_ERR(dentry));
2759
2760         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2761
2762         down(&dentry->d_inode->i_sem);
2763         rc = filemap_fdatawrite(dentry->d_inode->i_mapping);
2764         if (rc == 0) {
2765                 /* just any file to grab fsync method - "file" arg unused */
2766                 struct file *file = filter->fo_rcvd_filp;
2767
2768                 if (file->f_op && file->f_op->fsync)
2769                         rc = file->f_op->fsync(NULL, dentry, 1);
2770
2771                 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
2772                 if (!rc)
2773                         rc = rc2;
2774         }
2775         up(&dentry->d_inode->i_sem);
2776
2777         oa->o_valid = OBD_MD_FLID;
2778         obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
2779
2780         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
2781
2782         f_dput(dentry);
2783         RETURN(rc);
2784 }
2785
2786 static int filter_get_info(struct obd_export *exp, __u32 keylen,
2787                            void *key, __u32 *vallen, void *val)
2788 {
2789         struct filter_export_data *fed = &exp->exp_filter_data;
2790         struct obd_device *obd;
2791         ENTRY;
2792
2793         obd = class_exp2obd(exp);
2794         if (obd == NULL) {
2795                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2796                        exp->exp_handle.h_cookie);
2797                 RETURN(-EINVAL);
2798         }
2799
2800         if (keylen == strlen("blocksize") &&
2801             memcmp(key, "blocksize", keylen) == 0) {
2802                 __u32 *blocksize = val;
2803                 *vallen = sizeof(*blocksize);
2804                 *blocksize = obd->u.filter.fo_sb->s_blocksize;
2805                 RETURN(0);
2806         }
2807
2808         if (keylen == strlen("blocksize_bits") &&
2809             memcmp(key, "blocksize_bits", keylen) == 0) {
2810                 __u32 *blocksize_bits = val;
2811                 *vallen = sizeof(*blocksize_bits);
2812                 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
2813                 RETURN(0);
2814         }
2815
2816         if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
2817                 obd_id *last_id = val;
2818                 *last_id = filter_last_id(&obd->u.filter, fed->fed_group);
2819                 RETURN(0);
2820         }
2821         if (keylen >= strlen("reint_log") && memcmp(key, "reint_log", 9) == 0) {
2822                 /*Get log_context handle*/
2823                 unsigned long *llh_handle = val;
2824                 *vallen = sizeof(unsigned long);
2825                 *llh_handle = (unsigned long)obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT];
2826                 RETURN(0);
2827         }
2828         if (keylen >= strlen("cache_sb") && memcmp(key, "cache_sb", 8) == 0) {
2829                 /*Get log_context handle*/
2830                 unsigned long *sb = val;
2831                 *vallen = sizeof(unsigned long);
2832                 *sb = (unsigned long)obd->u.filter.fo_sb;
2833                 RETURN(0);
2834         }
2835
2836         CDEBUG(D_IOCTL, "invalid key\n");
2837         RETURN(-EINVAL);
2838 }
2839
2840 struct obd_llogs *filter_grab_llog_for_group(struct obd_device *obd, int group,
2841                                              struct obd_export *export)
2842 {
2843         struct filter_group_llog *fglog, *nlog;
2844         char name[32] = "CATLIST";
2845         struct filter_obd *filter;
2846         struct llog_ctxt *ctxt;
2847         struct list_head *cur;
2848         int rc;
2849
2850         filter = &obd->u.filter;
2851
2852         spin_lock(&filter->fo_llog_list_lock);
2853         list_for_each(cur, &filter->fo_llog_list) {
2854                 fglog = list_entry(cur, struct filter_group_llog, list);
2855                 if (fglog->group == group) {
2856                         if (!(fglog->exp == NULL || fglog->exp == export || export == NULL))
2857                                 CWARN("%s: export for group %d changes: 0x%p -> 0x%p\n",
2858                                       obd->obd_name, group, fglog->exp, export);
2859                         spin_unlock(&filter->fo_llog_list_lock);
2860                         goto init;
2861                 }
2862         }
2863         spin_unlock(&filter->fo_llog_list_lock);
2864
2865         if (export == NULL)
2866                 RETURN(NULL);
2867
2868         OBD_ALLOC(fglog, sizeof(*fglog));
2869         if (fglog == NULL)
2870                 RETURN(NULL);
2871         fglog->group = group;
2872
2873         OBD_ALLOC(fglog->llogs, sizeof(struct obd_llogs));
2874         if (fglog->llogs == NULL) {
2875                 OBD_FREE(fglog, sizeof(*fglog));
2876                 RETURN(NULL);
2877         }
2878
2879         spin_lock(&filter->fo_llog_list_lock);
2880         list_for_each(cur, &filter->fo_llog_list) {
2881                 nlog = list_entry(cur, struct filter_group_llog, list);
2882                 LASSERT(nlog->group != group);
2883         }
2884         list_add(&fglog->list, &filter->fo_llog_list);
2885         spin_unlock(&filter->fo_llog_list_lock);
2886
2887         rc = obd_llog_cat_initialize(obd, fglog->llogs, 1, name);
2888         if (rc) {
2889                 OBD_FREE(fglog->llogs, sizeof(*(fglog->llogs)));
2890                 OBD_FREE(fglog, sizeof(*fglog));
2891                 RETURN(NULL);
2892         }
2893
2894 init:
2895         if (export) {
2896                 fglog->exp = export;
2897                 ctxt = llog_get_context(fglog->llogs, LLOG_UNLINK_REPL_CTXT);
2898                 LASSERT(ctxt != NULL);
2899
2900                 llog_receptor_accept(ctxt, export->exp_imp_reverse);
2901         }
2902         CDEBUG(D_OTHER, "%s: new llog 0x%p for group %u\n",
2903                obd->obd_name, fglog->llogs, group);
2904
2905         RETURN(fglog->llogs);
2906 }
2907
2908 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
2909                      int len, void *karg, void *uarg)
2910 {
2911         struct obd_device *obd = exp->exp_obd;
2912         struct obd_ioctl_data *data = karg;
2913         int rc = 0;
2914
2915         switch (cmd) {
2916         case OBD_IOC_ABORT_RECOVERY:
2917                 target_stop_recovery_thread(obd);
2918                 RETURN(0);
2919
2920         case OBD_IOC_SET_READONLY: {
2921                 void *handle;
2922                 struct super_block *sb = obd->u.filter.fo_sb;
2923                 struct inode *inode = sb->s_root->d_inode;
2924                 BDEVNAME_DECLARE_STORAGE(tmp);
2925                 CERROR("setting device %s read-only\n",
2926                        ll_bdevname(sb, tmp));
2927
2928                 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
2929                 LASSERT(handle);
2930                 (void)fsfilt_commit(obd, sb, inode, handle, 1);
2931
2932                 ll_set_rdonly(ll_sbdev(obd->u.filter.fo_sb));
2933                 RETURN(0);
2934         }
2935
2936         case OBD_IOC_CATLOGLIST: {
2937                 rc = llog_catalog_list(obd, 1, data);
2938                 RETURN(rc);
2939         }
2940         case OBD_IOC_LLOG_CANCEL:
2941         case OBD_IOC_LLOG_REMOVE:
2942         case OBD_IOC_LLOG_INFO:
2943         case OBD_IOC_LLOG_PRINT: {
2944                 /* FIXME to be finished */
2945                 RETURN(-EOPNOTSUPP);
2946 /*
2947                 struct llog_ctxt *ctxt = NULL;
2948
2949                 push_ctxt(&saved, &ctxt->loc_ctxt, NULL);
2950                 rc = llog_ioctl(ctxt, cmd, data);
2951                 pop_ctxt(&saved, &ctxt->loc_ctxt, NULL);
2952
2953                 RETURN(rc);
2954 */
2955         }
2956
2957
2958         default:
2959                 RETURN(-EINVAL);
2960         }
2961         RETURN(0);
2962 }
2963
2964 static struct llog_operations filter_unlink_repl_logops;
2965 static struct llog_operations filter_size_orig_logops = {
2966         lop_setup: llog_obd_origin_setup,
2967         lop_cleanup: llog_catalog_cleanup,
2968         lop_add: llog_catalog_add,
2969 };
2970
2971 static int filter_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
2972                             struct obd_device *tgt, int count,
2973                             struct llog_catid *catid)
2974 {
2975         struct llog_ctxt *ctxt;
2976         int rc;
2977         ENTRY;
2978
2979         filter_unlink_repl_logops = llog_client_ops;
2980         filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
2981         filter_unlink_repl_logops.lop_connect = llog_repl_connect;
2982         filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
2983
2984         rc = obd_llog_setup(obd, llogs, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
2985                         &filter_unlink_repl_logops);
2986         if (rc)
2987                 RETURN(rc);
2988         /* FIXME - assign unlink_cb for filter's recovery */
2989         ctxt = llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT);
2990         ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
2991
2992         /* FIXME - count should be 1 to setup size log */
2993         rc = obd_llog_setup(obd, llogs, LLOG_SIZE_ORIG_CTXT, tgt, 0, 
2994                             &catid->lci_logid, &filter_size_orig_logops);
2995         RETURN(rc);
2996 }
2997
2998 static int filter_llog_finish(struct obd_device *obd,
2999                               struct obd_llogs *llogs, int count)
3000 {
3001         int rc;
3002         ENTRY;
3003
3004         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_UNLINK_REPL_CTXT));
3005         if (rc)
3006                 RETURN(rc);
3007
3008         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_SIZE_ORIG_CTXT));
3009         RETURN(rc);
3010 }
3011
3012 static int filter_llog_connect(struct obd_export *exp,
3013                                struct llogd_conn_body *body) 
3014 {
3015         struct obd_device *obd = exp->exp_obd;
3016         struct llog_ctxt *ctxt;
3017         struct obd_llogs *llog;
3018         int rc;
3019         ENTRY;
3020
3021         CDEBUG(D_OTHER, "handle connect for %s: %u/%u/%u\n", obd->obd_name,
3022                (unsigned) body->lgdc_logid.lgl_ogr,
3023                (unsigned) body->lgdc_logid.lgl_oid,
3024                (unsigned) body->lgdc_logid.lgl_ogen);
3025         llog = filter_grab_llog_for_group(obd, body->lgdc_logid.lgl_ogr, exp);
3026         LASSERT(llog != NULL);
3027         ctxt = llog_get_context(llog, body->lgdc_ctxt_idx);
3028         rc = llog_connect(ctxt, 1, &body->lgdc_logid,
3029                           &body->lgdc_gen, NULL);
3030         if (rc != 0)
3031                 CERROR("failed to connect\n");
3032
3033         RETURN(rc);
3034 }
3035
3036 static struct dentry *filter_lvfs_id2dentry(__u64 id, __u32 gen, 
3037                                             __u64 gr, void *data)
3038 {
3039         return filter_id2dentry(data, NULL, gr, id);
3040 }
3041
3042 static struct lvfs_callback_ops filter_lvfs_ops = {
3043         l_id2dentry:     filter_lvfs_id2dentry,
3044 };
3045
3046 static struct obd_ops filter_obd_ops = {
3047         .o_owner          = THIS_MODULE,
3048         .o_attach         = filter_attach,
3049         .o_detach         = filter_detach,
3050         .o_get_info       = filter_get_info,
3051         .o_setup          = filter_setup,
3052         .o_precleanup     = filter_precleanup,
3053         .o_cleanup        = filter_cleanup,
3054         .o_connect        = filter_connect,
3055         .o_connect_post   = filter_connect_post,
3056         .o_disconnect     = filter_disconnect,
3057         .o_statfs         = filter_statfs,
3058         .o_getattr        = filter_getattr,
3059         .o_unpackmd       = filter_unpackmd,
3060         .o_create         = filter_create,
3061         .o_setattr        = filter_setattr,
3062         .o_destroy        = filter_destroy,
3063         .o_brw            = filter_brw,
3064         .o_punch          = filter_truncate,
3065         .o_sync           = filter_sync,
3066         .o_preprw         = filter_preprw,
3067         .o_commitrw       = filter_commitrw,
3068         .o_do_cow         = filter_do_cow,
3069         .o_write_extents  = filter_write_extents,
3070         .o_destroy_export = filter_destroy_export,
3071         .o_llog_init      = filter_llog_init,
3072         .o_llog_finish    = filter_llog_finish,
3073         .o_llog_connect   = filter_llog_connect,
3074         .o_iocontrol      = filter_iocontrol,
3075 };
3076
3077 static struct obd_ops filter_sanobd_ops = {
3078         .o_owner          = THIS_MODULE,
3079         .o_attach         = filter_attach,
3080         .o_detach         = filter_detach,
3081         .o_get_info       = filter_get_info,
3082         .o_setup          = filter_san_setup,
3083         .o_precleanup     = filter_precleanup,
3084         .o_cleanup        = filter_cleanup,
3085         .o_connect        = filter_connect,
3086         .o_connect_post   = filter_connect_post,
3087         .o_disconnect     = filter_disconnect,
3088         .o_statfs         = filter_statfs,
3089         .o_getattr        = filter_getattr,
3090         .o_unpackmd       = filter_unpackmd,
3091         .o_create         = filter_create,
3092         .o_setattr        = filter_setattr,
3093         .o_destroy        = filter_destroy,
3094         .o_brw            = filter_brw,
3095         .o_punch          = filter_truncate,
3096         .o_sync           = filter_sync,
3097         .o_preprw         = filter_preprw,
3098         .o_commitrw       = filter_commitrw,
3099         .o_do_cow         = filter_do_cow,
3100         .o_write_extents  = filter_write_extents,
3101         .o_san_preprw     = filter_san_preprw,
3102         .o_destroy_export = filter_destroy_export,
3103         .o_llog_init      = filter_llog_init,
3104         .o_llog_finish    = filter_llog_finish,
3105         .o_llog_connect   = filter_llog_connect,
3106         .o_iocontrol      = filter_iocontrol,
3107 };
3108
3109 static int __init obdfilter_init(void)
3110 {
3111         struct lprocfs_static_vars lvars;
3112         int size, rc;
3113
3114         printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
3115
3116         lprocfs_init_vars(filter, &lvars);
3117
3118         size = OBDFILTER_CREATED_SCRATCHPAD_ENTRIES * 
3119                 sizeof(*obdfilter_created_scratchpad);
3120         
3121         OBD_ALLOC(obdfilter_created_scratchpad, size);
3122         if (obdfilter_created_scratchpad == NULL) {
3123                 CERROR ("Can't allocate scratchpad\n");
3124                 return -ENOMEM;
3125         }
3126
3127         rc = class_register_type(&filter_obd_ops, NULL, lvars.module_vars,
3128                                  OBD_FILTER_DEVICENAME);
3129         if (rc) {
3130                 OBD_FREE(obdfilter_created_scratchpad, size);
3131                 return rc;
3132         }
3133
3134         rc = class_register_type(&filter_sanobd_ops, NULL, lvars.module_vars,
3135                                  OBD_FILTER_SAN_DEVICENAME);
3136         if (rc) {
3137                 class_unregister_type(OBD_FILTER_DEVICENAME);
3138                 OBD_FREE(obdfilter_created_scratchpad, size);
3139         }
3140         return rc;
3141 }
3142
3143 static void __exit obdfilter_exit(void)
3144 {
3145         class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
3146         class_unregister_type(OBD_FILTER_DEVICENAME);
3147         OBD_FREE(obdfilter_created_scratchpad,
3148                  OBDFILTER_CREATED_SCRATCHPAD_ENTRIES * 
3149                  sizeof(*obdfilter_created_scratchpad));
3150 }
3151
3152 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
3153 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
3154 MODULE_LICENSE("GPL");
3155
3156 module_init(obdfilter_init);
3157 module_exit(obdfilter_exit);