1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * linux/fs/obdfilter/filter.c
6 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
7 * Author: Peter Braam <braam@clusterfs.com>
8 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
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.
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.
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.
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).
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.
36 #define DEBUG_SUBSYSTEM S_FILTER
38 #include <linux/config.h>
39 #include <linux/module.h>
41 #include <linux/dcache.h>
42 #include <linux/init.h>
43 #include <linux/version.h>
44 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
45 # include <linux/mount.h>
46 # include <linux/buffer_head.h>
49 #include <linux/obd_class.h>
50 #include <linux/obd_lov.h>
51 #include <linux/lustre_dlm.h>
52 #include <linux/lustre_fsfilt.h>
53 #include <linux/lprocfs_status.h>
54 #include <linux/lustre_log.h>
55 #include <linux/lustre_commit_confd.h>
57 #include "filter_internal.h"
59 static struct lvfs_callback_ops filter_lvfs_ops;
61 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
62 struct lov_stripe_md *ea, struct obd_trans_info *);
64 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
65 void *cb_data, int error)
67 obd_transno_commit_cb(obd, transno, error);
71 /* Assumes caller has already pushed us into the kernel context. */
72 int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
75 struct filter_obd *filter = &exp->exp_obd->u.filter;
76 struct filter_export_data *fed = &exp->exp_filter_data;
77 struct filter_client_data *fcd = fed->fed_fcd;
80 int err, log_pri = D_HA;
82 /* Propagate error code. */
86 if (!exp->exp_obd->obd_replayable || oti == NULL)
89 /* we don't allocate new transnos for replayed requests */
90 if (oti->oti_transno == 0) {
91 spin_lock(&filter->fo_translock);
92 last_rcvd = le64_to_cpu(filter->fo_fsd->fsd_last_transno) + 1;
93 filter->fo_fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
94 spin_unlock(&filter->fo_translock);
95 oti->oti_transno = last_rcvd;
97 spin_lock(&filter->fo_translock);
98 last_rcvd = oti->oti_transno;
99 if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno))
100 filter->fo_fsd->fsd_last_transno =
101 cpu_to_le64(last_rcvd);
102 spin_unlock(&filter->fo_translock);
104 fcd->fcd_last_rcvd = cpu_to_le64(last_rcvd);
105 fcd->fcd_mount_count = cpu_to_le64(filter->fo_mount_count);
107 /* could get xid from oti, if it's ever needed */
108 fcd->fcd_last_xid = 0;
110 off = fed->fed_lr_off;
111 fsfilt_add_journal_cb(exp->exp_obd, last_rcvd, oti->oti_handle,
112 filter_commit_cb, NULL);
113 err = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp, fcd,
114 sizeof(*fcd), &off, 0);
121 CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
122 last_rcvd, fcd->fcd_uuid, fed->fed_lr_idx, err);
127 void f_dput(struct dentry *dentry)
129 /* Can't go inside filter_ddelete because it can block */
130 CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
131 dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
132 LASSERT(atomic_read(&dentry->d_count) > 0);
137 /* Add client data to the FILTER. We use a bitmap to locate a free space
138 * in the last_rcvd file if cl_idx is -1 (i.e. a new client).
139 * Otherwise, we have just read the data from the last_rcvd file and
140 * we know its offset. */
141 static int filter_client_add(struct obd_device *obd, struct filter_obd *filter,
142 struct filter_export_data *fed, int cl_idx)
144 unsigned long *bitmap = filter->fo_last_rcvd_slots;
145 int new_client = (cl_idx == -1);
148 LASSERT(bitmap != NULL);
150 /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
151 if (!strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid))
154 /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
155 * there's no need for extra complication here
158 cl_idx = find_first_zero_bit(bitmap, FILTER_LR_MAX_CLIENTS);
160 if (cl_idx >= FILTER_LR_MAX_CLIENTS) {
161 CERROR("no client slots - fix FILTER_LR_MAX_CLIENTS\n");
164 if (test_and_set_bit(cl_idx, bitmap)) {
165 CERROR("FILTER client %d: found bit is set in bitmap\n",
167 cl_idx = find_next_zero_bit(bitmap,
168 FILTER_LR_MAX_CLIENTS,
173 if (test_and_set_bit(cl_idx, bitmap)) {
174 CERROR("FILTER client %d: bit already set in bitmap!\n",
180 fed->fed_lr_idx = cl_idx;
181 fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->fsd_client_start) +
182 cl_idx * le16_to_cpu(filter->fo_fsd->fsd_client_size);
184 CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
185 fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
188 struct obd_run_ctxt saved;
189 loff_t off = fed->fed_lr_off;
193 CDEBUG(D_INFO, "writing client fcd at idx %u (%llu) (len %u)\n",
194 fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_fcd));
196 push_ctxt(&saved, &obd->obd_ctxt, NULL);
197 /* Transaction needed to fix bug 1403 */
198 handle = fsfilt_start(obd,
199 filter->fo_rcvd_filp->f_dentry->d_inode,
200 FSFILT_OP_SETATTR, NULL);
201 if (IS_ERR(handle)) {
202 err = PTR_ERR(handle);
203 CERROR("unable to start transaction: rc %d\n", err);
205 err = fsfilt_write_record(obd, filter->fo_rcvd_filp,
207 sizeof(*fed->fed_fcd),
210 filter->fo_rcvd_filp->f_dentry->d_inode,
213 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
216 CERROR("error writing %s client idx %u: rc %d\n",
217 LAST_RCVD, fed->fed_lr_idx, err);
224 static int filter_client_free(struct obd_export *exp, int flags)
226 struct filter_export_data *fed = &exp->exp_filter_data;
227 struct filter_obd *filter = &exp->exp_obd->u.filter;
228 struct obd_device *obd = exp->exp_obd;
229 struct filter_client_data zero_fcd;
230 struct obd_run_ctxt saved;
235 if (fed->fed_fcd == NULL)
238 if (flags & OBD_OPT_FAILOVER)
241 /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
242 if (strcmp(fed->fed_fcd->fcd_uuid, obd->obd_uuid.uuid ) == 0)
245 LASSERT(filter->fo_last_rcvd_slots != NULL);
247 off = fed->fed_lr_off;
249 CDEBUG(D_INFO, "freeing client at idx %u (%lld) with UUID '%s'\n",
250 fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid);
252 if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
253 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
258 memset(&zero_fcd, 0, sizeof zero_fcd);
259 push_ctxt(&saved, &obd->obd_ctxt, NULL);
260 rc = fsfilt_write_record(obd, filter->fo_rcvd_filp, &zero_fcd,
261 sizeof(zero_fcd), &off, 1);
262 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
264 CDEBUG(rc == 0 ? D_INFO : D_ERROR,
265 "zeroing disconnecting client %s at idx %u (%llu) in %s rc %d\n",
266 fed->fed_fcd->fcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
270 OBD_FREE(fed->fed_fcd, sizeof(*fed->fed_fcd));
275 static int filter_free_server_data(struct filter_obd *filter)
277 OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
278 filter->fo_fsd = NULL;
279 OBD_FREE(filter->fo_last_rcvd_slots,
280 FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long));
281 filter->fo_last_rcvd_slots = NULL;
285 /* assumes caller is already in kernel ctxt */
286 int filter_update_server_data(struct obd_device *obd, struct file *filp,
287 struct filter_server_data *fsd, int force_sync)
293 CDEBUG(D_INODE, "server uuid : %s\n", fsd->fsd_uuid);
294 CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
295 le64_to_cpu(fsd->fsd_last_transno));
296 CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
297 le64_to_cpu(fsd->fsd_mount_count));
299 rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off,force_sync);
301 CERROR("error writing filter_server_data: rc = %d\n", rc);
306 int filter_update_last_objid(struct obd_device *obd, obd_gr group,
309 struct filter_obd *filter = &obd->u.filter;
315 CDEBUG(D_INODE, "server last_objid for group "LPU64": "LPU64"\n",
316 group, filter->fo_last_objids[group]);
318 tmp = cpu_to_le64(filter->fo_last_objids[group]);
319 rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
320 &tmp, sizeof(tmp), &off, force_sync);
322 CERROR("error writing group "LPU64" last objid: rc = %d\n",
327 /* assumes caller has already in kernel ctxt */
328 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
330 struct filter_obd *filter = &obd->u.filter;
331 struct filter_server_data *fsd;
332 struct filter_client_data *fcd = NULL;
333 struct inode *inode = filp->f_dentry->d_inode;
334 unsigned long last_rcvd_size = inode->i_size;
340 /* ensure padding in the struct is the correct size */
341 LASSERT (offsetof(struct filter_server_data, fsd_padding) +
342 sizeof(fsd->fsd_padding) == FILTER_LR_SERVER_SIZE);
343 LASSERT (offsetof(struct filter_client_data, fcd_padding) +
344 sizeof(fcd->fcd_padding) == FILTER_LR_CLIENT_SIZE);
346 OBD_ALLOC(fsd, sizeof(*fsd));
349 filter->fo_fsd = fsd;
351 OBD_ALLOC(filter->fo_last_rcvd_slots,
352 FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long));
353 if (filter->fo_last_rcvd_slots == NULL) {
354 OBD_FREE(fsd, sizeof(*fsd));
358 if (last_rcvd_size == 0) {
359 CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD);
361 memcpy(fsd->fsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->fsd_uuid));
362 fsd->fsd_last_transno = 0;
363 mount_count = fsd->fsd_mount_count = 0;
364 fsd->fsd_server_size = cpu_to_le32(FILTER_LR_SERVER_SIZE);
365 fsd->fsd_client_start = cpu_to_le32(FILTER_LR_CLIENT_START);
366 fsd->fsd_client_size = cpu_to_le16(FILTER_LR_CLIENT_SIZE);
367 fsd->fsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
368 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
370 rc = fsfilt_read_record(obd, filp, fsd, sizeof(*fsd), &off);
372 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
376 if (strcmp(fsd->fsd_uuid, obd->obd_uuid.uuid) != 0) {
377 CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
378 obd->obd_uuid.uuid, fsd->fsd_uuid);
379 GOTO(err_fsd, rc = -EINVAL);
381 mount_count = le64_to_cpu(fsd->fsd_mount_count);
382 filter->fo_subdir_count = le16_to_cpu(fsd->fsd_subdir_count);
385 if (fsd->fsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
386 CERROR("unsupported feature %x\n",
387 le32_to_cpu(fsd->fsd_feature_incompat) &
388 ~FILTER_INCOMPAT_SUPP);
389 GOTO(err_fsd, rc = -EINVAL);
391 if (fsd->fsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
392 CERROR("read-only feature %x\n",
393 le32_to_cpu(fsd->fsd_feature_rocompat) &
394 ~FILTER_ROCOMPAT_SUPP);
395 /* Do something like remount filesystem read-only */
396 GOTO(err_fsd, rc = -EINVAL);
399 CDEBUG(D_INODE, "%s: server last_rcvd : "LPU64"\n",
400 obd->obd_name, le64_to_cpu(fsd->fsd_last_transno));
401 CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
402 obd->obd_name, mount_count + 1);
403 CDEBUG(D_INODE, "%s: server data size: %u\n",
404 obd->obd_name, le32_to_cpu(fsd->fsd_server_size));
405 CDEBUG(D_INODE, "%s: per-client data start: %u\n",
406 obd->obd_name, le32_to_cpu(fsd->fsd_client_start));
407 CDEBUG(D_INODE, "%s: per-client data size: %u\n",
408 obd->obd_name, le32_to_cpu(fsd->fsd_client_size));
409 CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
410 obd->obd_name, le16_to_cpu(fsd->fsd_subdir_count));
411 CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
412 last_rcvd_size <= FILTER_LR_CLIENT_START ? 0 :
413 (last_rcvd_size-FILTER_LR_CLIENT_START) /FILTER_LR_CLIENT_SIZE);
415 if (!obd->obd_replayable) {
416 CWARN("%s: recovery support OFF\n", obd->obd_name);
420 for (cl_idx = 0, off = le32_to_cpu(fsd->fsd_client_start);
421 off < last_rcvd_size; cl_idx++) {
426 OBD_ALLOC(fcd, sizeof(*fcd));
428 GOTO(err_client, rc = -ENOMEM);
431 /* Don't assume off is incremented properly by
432 * fsfilt_read_record(), in case sizeof(*fcd)
433 * isn't the same as fsd->fsd_client_size. */
434 off = le32_to_cpu(fsd->fsd_client_start) +
435 cl_idx * le16_to_cpu(fsd->fsd_client_size);
436 rc = fsfilt_read_record(obd, filp, fcd, sizeof(*fcd), &off);
438 CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
439 LAST_RCVD, cl_idx, off, rc);
440 break; /* read error shouldn't cause startup to fail */
443 if (fcd->fcd_uuid[0] == '\0') {
444 CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
449 last_rcvd = le64_to_cpu(fcd->fcd_last_rcvd);
451 /* These exports are cleaned up by filter_disconnect(), so they
452 * need to be set up like real exports as filter_connect() does.
454 mount_age = mount_count - le64_to_cpu(fcd->fcd_mount_count);
455 if (mount_age < FILTER_MOUNT_RECOV) {
456 struct obd_export *exp = class_new_export(obd);
457 struct filter_export_data *fed;
458 CERROR("RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
459 " srv lr: "LPU64" mnt: "LPU64" last mount: "
460 LPU64"\n", fcd->fcd_uuid, cl_idx,
461 last_rcvd, le64_to_cpu(fsd->fsd_last_transno),
462 le64_to_cpu(fcd->fcd_mount_count), mount_count);
464 GOTO(err_client, rc = -ENOMEM);
466 memcpy(&exp->exp_client_uuid.uuid, fcd->fcd_uuid,
467 sizeof exp->exp_client_uuid.uuid);
468 fed = &exp->exp_filter_data;
470 filter_client_add(obd, filter, fed, cl_idx);
471 /* create helper if export init gets more complex */
472 spin_lock_init(&fed->fed_lock);
475 obd->obd_recoverable_clients++;
476 class_export_put(exp);
478 CDEBUG(D_INFO, "discarded client %d UUID '%s' count "
479 LPU64"\n", cl_idx, fcd->fcd_uuid,
480 le64_to_cpu(fcd->fcd_mount_count));
483 CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
486 if (last_rcvd > le64_to_cpu(fsd->fsd_last_transno))
487 fsd->fsd_last_transno = cpu_to_le64(last_rcvd);
491 obd->obd_last_committed = le64_to_cpu(fsd->fsd_last_transno);
493 if (obd->obd_recoverable_clients) {
494 CERROR("RECOVERY: %d recoverable clients, last_rcvd "
495 LPU64"\n", obd->obd_recoverable_clients,
496 le64_to_cpu(fsd->fsd_last_transno));
497 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
498 obd->obd_recovering = 1;
502 OBD_FREE(fcd, sizeof(*fcd));
505 filter->fo_mount_count = mount_count + 1;
506 fsd->fsd_mount_count = cpu_to_le64(filter->fo_mount_count);
508 /* save it, so mount count and last_transno is current */
509 rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
514 class_disconnect_exports(obd, 0);
516 filter_free_server_data(filter);
520 static int filter_cleanup_groups(struct obd_device *obd)
522 struct filter_obd *filter = &obd->u.filter;
526 if (filter->fo_dentry_O_groups != NULL &&
527 filter->fo_last_objids != NULL &&
528 filter->fo_last_objid_files != NULL) {
529 for (i = 0; i < FILTER_GROUPS; i++) {
530 struct dentry *dentry = filter->fo_dentry_O_groups[i];
531 struct file *filp = filter->fo_last_objid_files[i];
532 if (dentry != NULL) {
534 filter->fo_dentry_O_groups[i] = NULL;
538 filter->fo_last_objid_files[i] = NULL;
542 if (filter->fo_dentry_O_sub != NULL && filter->fo_subdir_count) {
543 for (i = 0; i < filter->fo_subdir_count; i++) {
544 struct dentry *dentry = filter->fo_dentry_O_sub[i];
545 if (dentry != NULL) {
547 filter->fo_dentry_O_sub[i] = NULL;
550 OBD_FREE(filter->fo_dentry_O_sub,
551 filter->fo_subdir_count *
552 sizeof(*filter->fo_dentry_O_sub));
554 if (filter->fo_dentry_O_groups != NULL)
555 OBD_FREE(filter->fo_dentry_O_groups,
556 FILTER_GROUPS * sizeof(struct dentry *));
557 if (filter->fo_last_objids != NULL)
558 OBD_FREE(filter->fo_last_objids,
559 FILTER_GROUPS * sizeof(__u64));
560 if (filter->fo_last_objid_files != NULL)
561 OBD_FREE(filter->fo_last_objid_files,
562 FILTER_GROUPS * sizeof(struct file *));
566 /* FIXME: object groups */
567 static int filter_prep_groups(struct obd_device *obd)
569 struct filter_obd *filter = &obd->u.filter;
570 struct dentry *dentry, *O_dentry;
572 int i, rc = 0, cleanup_phase = 0;
575 O_dentry = simple_mkdir(current->fs->pwd, "O", 0700);
576 CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
577 if (IS_ERR(O_dentry)) {
578 rc = PTR_ERR(O_dentry);
579 CERROR("cannot open/create O: rc = %d\n", rc);
582 filter->fo_dentry_O = O_dentry;
583 cleanup_phase = 1; /* O_dentry */
585 /* Lookup "R" to tell if we're on an old OST FS and need to convert
586 * from O/R/<dir>/<objid> to O/0/<dir>/<objid>. This can be removed
587 * some time post 1.0 when all old-style OSTs have converted along
588 * with the init_objid hack. */
589 dentry = ll_lookup_one_len("R", O_dentry, 1);
591 GOTO(cleanup, rc = PTR_ERR(dentry));
592 if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
593 struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
596 CWARN("converting OST to new object layout\n");
597 if (IS_ERR(O0_dentry)) {
598 rc = PTR_ERR(O0_dentry);
599 CERROR("error looking up O/0: rc %d\n", rc);
603 if (O0_dentry->d_inode) {
604 CERROR("Both O/R and O/0 exist. Fix manually.\n");
605 GOTO(cleanup_O0, rc = -EEXIST);
608 down(&O_dentry->d_inode->i_sem);
609 rc = vfs_rename(O_dentry->d_inode, dentry,
610 O_dentry->d_inode, O0_dentry);
611 up(&O_dentry->d_inode->i_sem);
614 CERROR("error renaming O/R to O/0: rc %d\n", rc);
615 GOTO(cleanup_O0, rc);
617 filter->fo_fsd->fsd_feature_incompat |=
618 cpu_to_le32(FILTER_INCOMPAT_GROUPS);
619 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
621 GOTO(cleanup_O0, rc);
633 OBD_ALLOC(filter->fo_last_objids, FILTER_GROUPS * sizeof(__u64));
634 if (filter->fo_last_objids == NULL)
635 GOTO(cleanup, rc = -ENOMEM);
636 cleanup_phase = 2; /* groups */
638 OBD_ALLOC(filter->fo_dentry_O_groups, FILTER_GROUPS * sizeof(dentry));
639 if (filter->fo_dentry_O_groups == NULL)
640 GOTO(cleanup, rc = -ENOMEM);
641 OBD_ALLOC(filter->fo_last_objid_files, FILTER_GROUPS * sizeof(filp));
642 if (filter->fo_last_objid_files == NULL)
643 GOTO(cleanup, rc = -ENOMEM);
645 for (i = 0; i < FILTER_GROUPS; i++) {
649 sprintf(name, "%d", i);
650 dentry = simple_mkdir(O_dentry, name, 0700);
651 CDEBUG(D_INODE, "got/created O/%s: %p\n", name, dentry);
652 if (IS_ERR(dentry)) {
653 rc = PTR_ERR(dentry);
654 CERROR("cannot lookup/create O/%s: rc = %d\n",
658 filter->fo_dentry_O_groups[i] = dentry;
660 sprintf(name, "O/%d/LAST_ID", i);
661 filp = filp_open(name, O_CREAT | O_RDWR, 0700);
662 if (IS_ERR(dentry)) {
663 rc = PTR_ERR(dentry);
664 CERROR("cannot create %s: rc = %d\n", name, rc);
667 filter->fo_last_objid_files[i] = filp;
669 if (filp->f_dentry->d_inode->i_size == 0) {
670 if (i == 0 && filter->fo_fsd->fsd_unused != 0) {
671 /* OST conversion, remove sometime post 1.0 */
672 filter->fo_last_objids[i] =
673 le64_to_cpu(filter->fo_fsd->fsd_unused);
674 CWARN("saving old objid "LPU64" to LAST_ID\n",
675 filter->fo_last_objids[i]);
676 rc = filter_update_last_objid(obd, 0, 1);
680 filter->fo_last_objids[i] = FILTER_INIT_OBJID;
685 rc = fsfilt_read_record(obd, filp, &filter->fo_last_objids[i],
686 sizeof(__u64), &off);
688 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
692 filter->fo_last_objids[i] =
693 le64_to_cpu(filter->fo_last_objids[i]);
694 CDEBUG(D_INODE, "%s: server last_objid group %d: "LPU64"\n",
695 obd->obd_name, i, filter->fo_last_objids[i]);
698 if (filter->fo_subdir_count) {
699 O_dentry = filter->fo_dentry_O_groups[0];
700 OBD_ALLOC(filter->fo_dentry_O_sub,
701 filter->fo_subdir_count * sizeof(dentry));
702 if (filter->fo_dentry_O_sub == NULL)
703 GOTO(cleanup, rc = -ENOMEM);
705 for (i = 0; i < filter->fo_subdir_count; i++) {
707 snprintf(dir, sizeof(dir), "d%u", i);
709 dentry = simple_mkdir(O_dentry, dir, 0700);
710 CDEBUG(D_INODE, "got/created O/0/%s: %p\n", dir,dentry);
711 if (IS_ERR(dentry)) {
712 rc = PTR_ERR(dentry);
713 CERROR("can't lookup/create O/0/%s: rc = %d\n",
717 filter->fo_dentry_O_sub[i] = dentry;
723 switch (cleanup_phase) {
725 filter_cleanup_groups(obd);
727 f_dput(filter->fo_dentry_O);
728 filter->fo_dentry_O = NULL;
735 /* setup the object store with correct subdirectories */
736 static int filter_prep(struct obd_device *obd)
738 struct obd_run_ctxt saved;
739 struct filter_obd *filter = &obd->u.filter;
745 push_ctxt(&saved, &obd->obd_ctxt, NULL);
746 file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
747 if (!file || IS_ERR(file)) {
749 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
754 if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
755 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
756 file->f_dentry->d_inode->i_mode);
757 GOTO(err_filp, rc = -ENOENT);
760 /* steal operations */
761 inode = file->f_dentry->d_inode;
762 filter->fo_fop = file->f_op;
763 filter->fo_iop = inode->i_op;
764 filter->fo_aops = inode->i_mapping->a_ops;
766 rc = filter_init_server_data(obd, file);
768 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
771 filter->fo_rcvd_filp = file;
773 rc = filter_prep_groups(obd);
775 GOTO(err_server_data, rc);
778 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
783 //class_disconnect_exports(obd, 0);
784 filter_free_server_data(filter);
786 if (filp_close(file, 0))
787 CERROR("can't close %s after error\n", LAST_RCVD);
788 filter->fo_rcvd_filp = NULL;
792 /* cleanup the filter: write last used object id to status file */
793 static void filter_post(struct obd_device *obd)
795 struct obd_run_ctxt saved;
796 struct filter_obd *filter = &obd->u.filter;
799 /* XXX: filter_update_lastobjid used to call fsync_dev. It might be
800 * best to start a transaction with h_sync, because we removed this
803 push_ctxt(&saved, &obd->obd_ctxt, NULL);
804 rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
807 CERROR("error writing server data: rc = %d\n", rc);
809 for (i = 0; i < FILTER_GROUPS; i++) {
810 rc = filter_update_last_objid(obd, i, (i == FILTER_GROUPS - 1));
812 CERROR("error writing group %d lastobjid: rc = %d\n",
816 filp_close(filter->fo_rcvd_filp, 0);
817 filter->fo_rcvd_filp = NULL;
819 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
821 filter_cleanup_groups(obd);
822 f_dput(filter->fo_dentry_O);
823 filter_free_server_data(filter);
824 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
827 static void filter_set_last_id(struct filter_obd *filter, struct obdo *oa,
831 LASSERT(filter->fo_fsd != NULL);
834 LASSERT(oa->o_gr <= FILTER_GROUPS);
838 spin_lock(&filter->fo_objidlock);
839 filter->fo_last_objids[group] = id;
840 spin_unlock(&filter->fo_objidlock);
843 __u64 filter_last_id(struct filter_obd *filter, struct obdo *oa)
847 LASSERT(filter->fo_fsd != NULL);
850 LASSERT(oa->o_gr <= FILTER_GROUPS);
854 /* FIXME: object groups */
855 spin_lock(&filter->fo_objidlock);
856 id = filter->fo_last_objids[group];
857 spin_unlock(&filter->fo_objidlock);
862 /* direct cut-n-paste of mds_blocking_ast() */
863 static int filter_blocking_ast(struct ldlm_lock *lock,
864 struct ldlm_lock_desc *desc,
865 void *data, int flag)
870 if (flag == LDLM_CB_CANCELING) {
871 /* Don't need to do anything here. */
875 /* XXX layering violation! -phil */
876 l_lock(&lock->l_resource->lr_namespace->ns_lock);
877 /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy,
878 * such that filter_blocking_ast is called just before l_i_p takes the
879 * ns_lock, then by the time we get the lock, we might not be the
880 * correct blocking function anymore. So check, and return early, if
882 if (lock->l_blocking_ast != filter_blocking_ast) {
883 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
887 lock->l_flags |= LDLM_FL_CBPENDING;
888 do_ast = (!lock->l_readers && !lock->l_writers);
889 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
892 struct lustre_handle lockh;
895 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
896 ldlm_lock2handle(lock, &lockh);
897 rc = ldlm_cli_cancel(&lockh);
899 CERROR("ldlm_cli_cancel: %d\n", rc);
901 LDLM_DEBUG(lock, "Lock still has references, will be "
907 static int filter_lock_dentry(struct obd_device *obd, struct dentry *de,
908 ldlm_mode_t lock_mode,struct lustre_handle *lockh)
910 struct ldlm_res_id res_id = { .name = {0} };
914 res_id.name[0] = de->d_inode->i_ino;
915 res_id.name[1] = de->d_inode->i_generation;
916 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
917 res_id, LDLM_PLAIN, NULL, 0, lock_mode,
918 &flags, ldlm_completion_ast,
919 filter_blocking_ast, NULL, lockh);
921 RETURN(rc == ELDLM_OK ? 0 : -EIO); /* XXX translate ldlm code */
924 /* We never dget the object parent, so DON'T dput it either */
925 static void filter_parent_unlock(struct dentry *dparent,
926 struct lustre_handle *lockh,
927 ldlm_mode_t lock_mode)
929 ldlm_lock_decref(lockh, lock_mode);
932 /* We never dget the object parent, so DON'T dput it either */
933 struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
935 struct filter_obd *filter = &obd->u.filter;
936 LASSERT(group < FILTER_GROUPS); /* FIXME: object groups */
938 if (group > 0 || filter->fo_subdir_count == 0)
939 return filter->fo_dentry_O_groups[group];
941 return filter->fo_dentry_O_sub[objid & (filter->fo_subdir_count - 1)];
944 /* We never dget the object parent, so DON'T dput it either */
945 struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
946 obd_id objid, ldlm_mode_t lock_mode,
947 struct lustre_handle *lockh)
949 unsigned long now = jiffies;
950 struct dentry *de = filter_parent(obd, group, objid);
956 rc = filter_lock_dentry(obd, de, lock_mode, lockh);
957 if (time_after(jiffies, now + 15 * HZ))
958 CERROR("slow parent lock %lus\n", (jiffies - now) / HZ);
959 return rc ? ERR_PTR(rc) : de;
962 /* How to get files, dentries, inodes from object id's.
964 * If dir_dentry is passed, the caller has already locked the parent
965 * appropriately for this operation (normally a write lock). If
966 * dir_dentry is NULL, we do a read lock while we do the lookup to
967 * avoid races with create/destroy and such changing the directory
968 * internal to the filesystem code. */
969 struct dentry *filter_fid2dentry(struct obd_device *obd,
970 struct dentry *dir_dentry,
971 obd_gr group, obd_id id)
973 struct lustre_handle lockh;
974 struct dentry *dparent = dir_dentry;
975 struct dentry *dchild;
981 CERROR("fatal: invalid object id 0\n");
982 RETURN(ERR_PTR(-ESTALE));
985 len = sprintf(name, LPU64, id);
986 if (dir_dentry == NULL) {
987 dparent = filter_parent_lock(obd, group, id, LCK_PR, &lockh);
991 CDEBUG(D_INODE, "looking up object O/%*s/%s\n",
992 dparent->d_name.len, dparent->d_name.name, name);
993 dchild = ll_lookup_one_len(name, dparent, len);
994 if (dir_dentry == NULL)
995 filter_parent_unlock(dparent, &lockh, LCK_PR);
996 if (IS_ERR(dchild)) {
997 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
1001 CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n",
1002 name, dchild, atomic_read(&dchild->d_count));
1004 LASSERT(atomic_read(&dchild->d_count) > 0);
1009 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid)
1011 struct lustre_handle lockh;
1012 int flags = LDLM_AST_DISCARD_DATA, rc;
1013 struct ldlm_res_id res_id = { .name = { objid } };
1014 struct ldlm_extent extent = { 0, OBD_OBJECT_EOF };
1017 /* Tell the clients that the object is gone now and that they should
1018 * throw away any cached pages. If we're the OST at stripe 0 in the
1019 * file then this enqueue will communicate the DISCARD to all the
1020 * clients. This assumes that we always destroy all the objects for
1021 * a file at a time, as is currently the case. If we're not the
1022 * OST at stripe 0 then we'll harmlessly get a very lonely lock in
1023 * the local DLM and immediately drop it. */
1024 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
1025 res_id, LDLM_EXTENT, &extent,
1026 sizeof(extent), LCK_PW, &flags,
1027 ldlm_completion_ast, filter_blocking_ast,
1030 /* We only care about the side-effects, just drop the lock. */
1032 ldlm_lock_decref(&lockh, LCK_PW);
1037 /* Caller must hold LCK_PW on parent and push us into kernel context.
1038 * Caller is also required to ensure that dchild->d_inode exists. */
1039 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
1040 struct dentry *dparent,
1041 struct dentry *dchild)
1043 struct inode *inode = dchild->d_inode;
1047 if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
1048 CERROR("destroying objid %*s nlink = %lu, count = %d\n",
1049 dchild->d_name.len, dchild->d_name.name,
1050 (unsigned long)inode->i_nlink,
1051 atomic_read(&inode->i_count));
1054 rc = vfs_unlink(dparent->d_inode, dchild);
1057 CERROR("error unlinking objid %*s: rc %d\n",
1058 dchild->d_name.len, dchild->d_name.name, rc);
1063 /* mount the file system (secretly) */
1064 int filter_common_setup(struct obd_device *obd, obd_count len, void *buf,
1067 struct lustre_cfg* lcfg = buf;
1068 struct filter_obd *filter = &obd->u.filter;
1069 struct vfsmount *mnt;
1073 dev_clear_rdonly(2);
1075 if (!lcfg->lcfg_inlbuf1 || !lcfg->lcfg_inlbuf2)
1078 obd->obd_fsops = fsfilt_get_ops(lcfg->lcfg_inlbuf2);
1079 if (IS_ERR(obd->obd_fsops))
1080 RETURN(PTR_ERR(obd->obd_fsops));
1082 mnt = do_kern_mount(lcfg->lcfg_inlbuf2, MS_NOATIME | MS_NODIRATIME,
1083 lcfg->lcfg_inlbuf1, option);
1088 if (lcfg->lcfg_inllen3 > 0 && lcfg->lcfg_inlbuf3) {
1089 if (*lcfg->lcfg_inlbuf3 == 'f') {
1090 obd->obd_replayable = 1;
1091 obd_sync_filter = 1;
1092 CERROR("%s: recovery enabled\n", obd->obd_name);
1094 if (*lcfg->lcfg_inlbuf3 != 'n') {
1095 CERROR("unrecognised flag '%c'\n",
1096 *lcfg->lcfg_inlbuf3);
1098 // XXX Robert? Why do we get errors here
1099 // GOTO(err_mntput, rc = -EINVAL);
1103 filter->fo_vfsmnt = mnt;
1104 filter->fo_sb = mnt->mnt_sb;
1105 filter->fo_fstype = mnt->mnt_sb->s_type->name;
1106 CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
1108 OBD_SET_CTXT_MAGIC(&obd->obd_ctxt);
1109 obd->obd_ctxt.pwdmnt = mnt;
1110 obd->obd_ctxt.pwd = mnt->mnt_root;
1111 obd->obd_ctxt.fs = get_ds();
1112 obd->obd_ctxt.cb_ops = filter_lvfs_ops;
1114 rc = filter_prep(obd);
1116 GOTO(err_mntput, rc);
1118 spin_lock_init(&filter->fo_translock);
1119 spin_lock_init(&filter->fo_objidlock);
1120 INIT_LIST_HEAD(&filter->fo_export_list);
1121 sema_init(&filter->fo_alloc_lock, 1);
1123 obd->obd_namespace = ldlm_namespace_new("filter-tgt",
1124 LDLM_NAMESPACE_SERVER);
1125 if (obd->obd_namespace == NULL)
1126 GOTO(err_post, rc = -ENOMEM);
1128 ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1129 "filter_ldlm_cb_client", &obd->obd_ldlm_client);
1141 fsfilt_put_ops(obd->obd_fsops);
1145 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
1147 struct lustre_cfg* lcfg = buf;
1148 const char *str = NULL;
1149 char *option = NULL;
1153 if (!strcmp(lcfg->lcfg_inlbuf2, "ext3")) {
1154 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1155 /* bug 1577: implement async-delete for 2.5 */
1156 str = "errors=remount-ro,asyncdel";
1158 str = "errors=remount-ro";
1160 n = strlen(str) + 1;
1161 OBD_ALLOC(option, n);
1164 strcpy(option, str);
1167 rc = filter_common_setup(obd, len, buf, option);
1169 OBD_FREE(option, n);
1173 static int filter_postsetup(struct obd_device *obd)
1178 // XXX add a storage location for the logid for size changes
1179 #ifdef ENABLE_ORPHANS
1180 rc = llog_cat_initialize(obd, 1);
1182 CERROR("failed to setup llogging subsystems\n");
1187 static int filter_cleanup(struct obd_device *obd, int flags)
1189 struct filter_obd *filter = &obd->u.filter;
1192 if (flags & OBD_OPT_FAILOVER)
1193 CERROR("%s: shutting down for failover; client state will"
1194 " be preserved.\n", obd->obd_name);
1196 if (!list_empty(&obd->obd_exports)) {
1197 CERROR("%s: still has clients!\n", obd->obd_name);
1198 class_disconnect_exports(obd, flags);
1199 if (!list_empty(&obd->obd_exports)) {
1200 CERROR("still has exports after forced cleanup?\n");
1205 ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1207 if (filter->fo_sb == NULL)
1212 shrink_dcache_parent(filter->fo_sb->s_root);
1215 if (atomic_read(&filter->fo_vfsmnt->mnt_count) > 1)
1216 CERROR("%s: mount point %p busy, mnt_count: %d\n",
1217 obd->obd_name, filter->fo_vfsmnt,
1218 atomic_read(&filter->fo_vfsmnt->mnt_count));
1221 mntput(filter->fo_vfsmnt);
1222 //destroy_buffers(filter->fo_sb->s_dev);
1223 filter->fo_sb = NULL;
1224 fsfilt_put_ops(obd->obd_fsops);
1227 dev_clear_rdonly(2);
1232 static int filter_attach(struct obd_device *obd, obd_count len, void *data)
1234 struct lprocfs_static_vars lvars;
1237 lprocfs_init_vars(filter, &lvars);
1238 rc = lprocfs_obd_attach(obd, lvars.obd_vars);
1242 rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
1246 /* Init obdfilter private stats here */
1247 lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
1248 LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
1249 lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
1250 LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
1254 static int filter_detach(struct obd_device *dev)
1256 lprocfs_free_obd_stats(dev);
1257 return lprocfs_obd_detach(dev);
1260 /* nearly identical to mds_connect */
1261 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
1262 struct obd_uuid *cluuid)
1264 struct obd_export *exp;
1265 struct filter_export_data *fed;
1266 struct filter_client_data *fcd = NULL;
1267 struct filter_obd *filter = &obd->u.filter;
1271 if (conn == NULL || obd == NULL || cluuid == NULL)
1274 rc = class_connect(conn, obd, cluuid);
1277 exp = class_conn2export(conn);
1278 LASSERT(exp != NULL);
1280 fed = &exp->exp_filter_data;
1282 spin_lock_init(&fed->fed_lock);
1284 if (!obd->obd_replayable)
1285 GOTO(cleanup, rc = 0);
1287 OBD_ALLOC(fcd, sizeof(*fcd));
1289 CERROR("filter: out of memory for client data\n");
1290 GOTO(cleanup, rc = -ENOMEM);
1293 memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid));
1295 fcd->fcd_mount_count = cpu_to_le64(filter->fo_mount_count);
1297 rc = filter_client_add(obd, filter, fed, -1);
1302 OBD_FREE(fcd, sizeof(*fcd));
1303 class_disconnect(exp, 0);
1305 class_export_put(exp);
1310 static int filter_precleanup(struct obd_device *obd, int flags)
1315 #ifdef ENABLE_ORPHANS
1316 rc = obd_llog_finish(obd, 0);
1318 CERROR("failed to cleanup llogging subsystem\n");
1324 static int filter_destroy_export(struct obd_export *exp)
1328 target_destroy_export(exp);
1330 if (exp->exp_obd->obd_replayable)
1331 filter_client_free(exp, exp->exp_flags);
1335 /* also incredibly similar to mds_disconnect */
1336 static int filter_disconnect(struct obd_export *exp, int flags)
1338 struct filter_obd *filter = &exp->exp_obd->u.filter;
1339 struct filter_export_data *fed = &exp->exp_filter_data;
1340 unsigned long irqflags;
1341 struct llog_ctxt *ctxt;
1347 /* XXX should this go into filter_destroy_export() instead? */
1348 /* forget what this client had cached, I bet this needs to be
1349 * matched with appropriate client behaviour in the face of
1351 spin_lock(&exp->exp_obd->obd_osfs_lock);
1352 filter->fo_tot_cached -= fed->fed_cached;
1353 filter->fo_tot_granted -= fed->fed_grant;
1354 fed->fed_cached = 0;
1356 fed->fed_grant_sent = 0;
1357 fed->fed_grant_waiting = 0;
1358 spin_unlock(&exp->exp_obd->obd_osfs_lock);
1360 ldlm_cancel_locks_for_export(exp);
1362 spin_lock_irqsave(&exp->exp_lock, irqflags);
1363 exp->exp_flags = flags;
1364 spin_unlock_irqrestore(&exp->exp_lock, irqflags);
1366 fsfilt_sync(exp->exp_obd, filter->fo_sb);
1367 /* XXX cleanup preallocated inodes */
1369 /* flush any remaining cancel messages out to the target */
1370 ctxt = llog_get_context(exp->exp_obd, LLOG_UNLINK_REPL_CTXT);
1371 llog_sync(ctxt, exp);
1373 rc = class_disconnect(exp, flags);
1377 struct dentry *__filter_oa2dentry(struct obd_device *obd,
1378 struct obdo *oa, const char *what)
1380 struct dentry *dchild = NULL;
1383 if (oa->o_valid & OBD_MD_FLGROUP)
1386 dchild = filter_fid2dentry(obd, NULL, group, oa->o_id);
1388 if (IS_ERR(dchild)) {
1389 CERROR("%s error looking up object: "LPU64"\n", what, oa->o_id);
1393 if (dchild->d_inode == NULL) {
1394 CERROR("%s on non-existent object: "LPU64"\n", what, oa->o_id);
1396 RETURN(ERR_PTR(-ENOENT));
1402 static int filter_getattr(struct obd_export *exp, struct obdo *oa,
1403 struct lov_stripe_md *md)
1405 struct dentry *dentry = NULL;
1406 struct obd_device *obd;
1410 obd = class_exp2obd(exp);
1412 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1413 exp->exp_handle.h_cookie);
1417 dentry = filter_oa2dentry(obd, oa);
1419 RETURN(PTR_ERR(dentry));
1421 /* Limit the valid bits in the return data to what we actually use */
1422 oa->o_valid = OBD_MD_FLID;
1423 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1429 /* this is called from filter_truncate() until we have filter_punch() */
1430 static int filter_setattr(struct obd_export *exp, struct obdo *oa,
1431 struct lov_stripe_md *md, struct obd_trans_info *oti)
1433 struct obd_run_ctxt saved;
1434 struct filter_obd *filter;
1435 struct dentry *dentry;
1441 LASSERT(oti != NULL);
1443 dentry = filter_oa2dentry(exp->exp_obd, oa);
1445 RETURN(PTR_ERR(dentry));
1447 filter = &exp->exp_obd->u.filter;
1449 iattr_from_obdo(&iattr, oa, oa->o_valid);
1451 push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1454 if (iattr.ia_valid & ATTR_SIZE)
1455 down(&dentry->d_inode->i_sem);
1456 handle = fsfilt_start(exp->exp_obd, dentry->d_inode, FSFILT_OP_SETATTR,
1459 GOTO(out_unlock, rc = PTR_ERR(handle));
1461 /* XXX this could be a rwsem instead, if filter_preprw played along */
1462 if (iattr.ia_valid & ATTR_ATTR_FLAG)
1463 rc = fsfilt_iocontrol(exp->exp_obd, dentry->d_inode, NULL,
1465 (long)&iattr.ia_attr_flags);
1467 rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1);
1468 rc = filter_finish_transno(exp, oti, rc);
1469 rc2 = fsfilt_commit(exp->exp_obd, dentry->d_inode, handle, 0);
1471 CERROR("error on commit, err = %d\n", rc2);
1476 oa->o_valid = OBD_MD_FLID;
1477 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1480 if (iattr.ia_valid & ATTR_SIZE)
1481 up(&dentry->d_inode->i_sem);
1483 pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1489 /* XXX identical to osc_unpackmd */
1490 static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
1491 struct lov_mds_md *lmm, int lmm_bytes)
1497 if (lmm_bytes < sizeof (*lmm)) {
1498 CERROR("lov_mds_md too small: %d, need %d\n",
1499 lmm_bytes, (int)sizeof(*lmm));
1502 /* XXX LOV_MAGIC etc check? */
1504 if (lmm->lmm_object_id == cpu_to_le64(0)) {
1505 CERROR("lov_mds_md: zero lmm_object_id\n");
1510 lsm_size = lov_stripe_md_size(1);
1514 if (*lsmp != NULL && lmm == NULL) {
1515 OBD_FREE(*lsmp, lsm_size);
1520 if (*lsmp == NULL) {
1521 OBD_ALLOC(*lsmp, lsm_size);
1525 loi_init((*lsmp)->lsm_oinfo);
1529 /* XXX zero *lsmp? */
1530 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
1531 LASSERT((*lsmp)->lsm_object_id);
1534 (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
1539 static void filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
1540 struct filter_obd *filter)
1542 struct obdo doa; /* XXX obdo on stack */
1547 memset(&doa, 0, sizeof(doa));
1548 if (oa->o_valid & OBD_MD_FLGROUP)
1549 doa.o_gr = oa->o_gr;
1552 doa.o_mode = S_IFREG;
1553 last = filter_last_id(filter, &doa); /* FIXME: object groups */
1554 CWARN("deleting orphan objects from "LPU64" to "LPU64"\n",
1555 oa->o_id + 1, last);
1556 for (id = oa->o_id + 1; id <= last; id++) {
1558 filter_destroy(exp, &doa, NULL, NULL);
1560 spin_lock(&filter->fo_objidlock);
1561 filter->fo_last_objids[0] = oa->o_id; /* FIXME: object groups */
1562 spin_unlock(&filter->fo_objidlock);
1566 /* returns a negative error or a nonnegative number of files to create */
1567 static int filter_should_precreate(struct obd_export *exp, struct obdo *oa,
1570 struct obd_device *obd = exp->exp_obd;
1571 struct filter_obd *filter = &obd->u.filter;
1575 diff = oa->o_id - filter_last_id(filter, oa);
1576 CDEBUG(D_INFO, "filter_last_id() = "LPU64" -> diff = %d\n",
1577 filter_last_id(filter, oa), diff);
1579 /* delete orphans request */
1580 if ((oa->o_valid & OBD_MD_FLFLAGS) &&
1581 (oa->o_flags & OBD_FL_DELORPHAN)) {
1585 filter_destroy_precreated(exp, oa, filter);
1586 rc = filter_update_last_objid(obd, group, 0);
1588 CERROR("unable to write lastobjid, but orphans"
1592 /* only precreate if group == 0 and o_id is specfied */
1593 if (!(oa->o_valid & OBD_FL_DELORPHAN) &&
1594 (group != 0 || oa->o_id == 0))
1603 /* We rely on the fact that only one thread will be creating files in a given
1604 * group at a time, which is why we don't need an atomic filter_get_new_id.
1605 * Even if we had that atomic function, the following race would exist:
1607 * thread 1: gets id x from filter_next_id
1608 * thread 2: gets id (x + 1) from filter_next_id
1609 * thread 2: creates object (x + 1)
1610 * thread 1: tries to create object x, gets -ENOSPC
1612 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
1613 obd_gr group, int *num)
1615 struct lustre_handle parent_lockh;
1616 struct dentry *dchild = NULL;
1617 struct filter_obd *filter;
1618 struct dentry *dparent;
1619 int err = 0, rc = 0, i;
1624 filter = &obd->u.filter;
1626 for (i = 0; i < *num && err == 0; i++) {
1627 int cleanup_phase = 0;
1629 next_id = filter_last_id(filter, oa) + 1;
1630 CDEBUG(D_INFO, "precreate objid "LPU64"\n", next_id);
1632 dparent = filter_parent_lock(obd, group, next_id, LCK_PW,
1634 if (IS_ERR(dparent))
1635 GOTO(cleanup, rc = PTR_ERR(dparent));
1638 dchild = filter_fid2dentry(obd, dparent, group, next_id);
1640 GOTO(cleanup, rc = PTR_ERR(dchild));
1643 if (dchild->d_inode != NULL) {
1644 /* This would only happen if lastobjid was bad on disk*/
1645 CERROR("Serious error: objid %*s already exists; is "
1646 "this filesystem corrupt?\n",
1647 dchild->d_name.len, dchild->d_name.name);
1648 GOTO(cleanup, rc = -EEXIST);
1651 handle = fsfilt_start(obd, dparent->d_inode,
1652 FSFILT_OP_CREATE_LOG, NULL);
1654 GOTO(cleanup, rc = PTR_ERR(handle));
1657 rc = ll_vfs_create(dparent->d_inode, dchild, S_IFREG, NULL);
1659 CERROR("create failed rc = %d\n", rc);
1663 filter_set_last_id(filter, oa, next_id);
1664 err = filter_update_last_objid(obd, group, 0);
1666 CERROR("unable to write lastobjid but file created\n");
1669 switch(cleanup_phase) {
1671 err = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1673 CERROR("error on commit, err = %d\n", err);
1680 filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1690 CDEBUG(D_INFO, "filter_precreate() created %d objects\n", i);
1694 static int filter_create(struct obd_export *exp, struct obdo *oa,
1695 struct lov_stripe_md **ea, struct obd_trans_info *oti)
1697 struct obd_device *obd = NULL;
1698 struct obd_run_ctxt saved;
1699 struct lov_stripe_md *lsm = NULL;
1704 if (oa->o_valid & OBD_MD_FLGROUP)
1707 CDEBUG(D_INFO, "filter_create(od->o_gr="LPU64",od->o_id="LPU64")\n",
1712 rc = obd_alloc_memmd(exp, &lsm);
1719 push_ctxt(&saved, &obd->obd_ctxt, NULL);
1721 diff = filter_should_precreate(exp, oa, group);
1723 oa->o_id = filter_last_id(&obd->u.filter, oa);
1724 rc = filter_precreate(obd, oa, group, &diff);
1726 oa->o_valid = OBD_MD_FLID;
1729 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1730 if (rc && ea != NULL && *ea != lsm) {
1731 obd_free_memmd(exp, &lsm);
1732 } else if (rc == 0 && ea != NULL) {
1733 /* XXX LOV STACKING: the lsm that is passed to us from
1734 * LOV does not have valid lsm_oinfo data structs, so
1735 * don't go touching that. This needs to be fixed in a
1737 lsm->lsm_object_id = oa->o_id;
1744 static int filter_destroy(struct obd_export *exp, struct obdo *oa,
1745 struct lov_stripe_md *ea, struct obd_trans_info *oti)
1747 struct obd_device *obd;
1748 struct filter_obd *filter;
1749 struct dentry *dchild = NULL, *dparent = NULL;
1750 struct obd_run_ctxt saved;
1751 void *handle = NULL;
1752 struct lustre_handle parent_lockh;
1753 struct llog_cookie *fcc = NULL;
1754 int rc, rc2, cleanup_phase = 0, have_prepared = 0;
1758 if (oa->o_valid & OBD_MD_FLGROUP)
1762 filter = &obd->u.filter;
1764 push_ctxt(&saved, &obd->obd_ctxt, NULL);
1767 dparent = filter_parent_lock(obd, group, oa->o_id, LCK_PW,
1769 if (IS_ERR(dparent))
1770 GOTO(cleanup, rc = PTR_ERR(dparent));
1773 dchild = filter_fid2dentry(obd, dparent, group, oa->o_id);
1775 GOTO(cleanup, rc = -ENOENT);
1778 if (dchild->d_inode == NULL) {
1779 CERROR("destroying non-existent object "LPU64"\n", oa->o_id);
1780 GOTO(cleanup, rc = -ENOENT);
1783 if (!have_prepared) {
1784 /* If we're really going to destroy the object, get ready
1785 * by getting the clients to discard their cached data.
1787 * We have to drop the parent lock, because
1788 * filter_prepare_destroy will acquire a PW on the object, and
1789 * we don't want to deadlock with an incoming write to the
1790 * object, which has the extent PW and then wants to get the
1791 * parent dentry to do the lookup.
1793 * We dput the child because it's not worth the extra
1794 * complication of condition the above code to skip it on the
1795 * second time through. */
1797 filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1799 filter_prepare_destroy(obd, oa->o_id);
1804 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK_LOG, oti);
1806 GOTO(cleanup, rc = PTR_ERR(handle));
1809 /* Our MDC connection is established by the MDS to us */
1810 if (oa->o_valid & OBD_MD_FLCOOKIE) {
1811 OBD_ALLOC(fcc, sizeof(*fcc));
1813 memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc));
1816 rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild);
1819 switch(cleanup_phase) {
1822 fsfilt_add_journal_cb(obd, 0, oti->oti_handle,
1823 filter_cancel_cookies_cb, fcc);
1824 rc = filter_finish_transno(exp, oti, rc);
1825 rc2 = fsfilt_commit(obd, dparent->d_inode, handle, 0);
1827 CERROR("error on commit, err = %d\n", rc2);
1834 if (rc || oti == NULL) {
1835 filter_parent_unlock(dparent, &parent_lockh, LCK_PW);
1837 memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh,
1838 sizeof(parent_lockh));
1839 oti->oti_ack_locks[0].mode = LCK_PW;
1842 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1845 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1852 /* NB start and end are used for punch, but not truncate */
1853 static int filter_truncate(struct obd_export *exp, struct obdo *oa,
1854 struct lov_stripe_md *lsm,
1855 obd_off start, obd_off end,
1856 struct obd_trans_info *oti)
1861 if (end != OBD_OBJECT_EOF)
1862 CERROR("PUNCH not supported, only truncate: end = "LPX64"\n",
1865 CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = %x, "
1866 "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
1868 error = filter_setattr(exp, oa, NULL, oti);
1872 static int filter_sync(struct obd_export *exp, struct obdo *oa,
1873 struct lov_stripe_md *lsm, obd_off start, obd_off end)
1875 struct obd_run_ctxt saved;
1876 struct filter_obd *filter;
1877 struct dentry *dentry;
1881 filter = &exp->exp_obd->u.filter;
1883 /* an objid of zero is taken to mean "sync whole filesystem" */
1884 if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
1885 rc = fsfilt_sync(exp->exp_obd, filter->fo_sb);
1889 dentry = filter_oa2dentry(exp->exp_obd, oa);
1891 RETURN(PTR_ERR(dentry));
1893 push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1895 down(&dentry->d_inode->i_sem);
1896 rc = filemap_fdatasync(dentry->d_inode->i_mapping);
1898 /* just any file to grab fsync method - "file" arg unused */
1899 struct file *file = filter->fo_rcvd_filp;
1901 if (file->f_op && file->f_op->fsync)
1902 rc = file->f_op->fsync(NULL, dentry, 1);
1904 rc2 = filemap_fdatawait(dentry->d_inode->i_mapping);
1908 up(&dentry->d_inode->i_sem);
1910 oa->o_valid = OBD_MD_FLID;
1911 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
1913 pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
1919 /* debugging to make sure that nothing bad happens, can be turned off soon */
1920 static void filter_grant_sanity_check(struct obd_device *obd,
1921 struct filter_obd *filter, __u64 maxsize)
1923 struct filter_export_data *fed;
1924 struct obd_export *exp_pos;
1925 obd_size tot_cached = 0, tot_granted = 0;
1927 list_for_each_entry(exp_pos, &obd->obd_exports, exp_obd_chain) {
1928 fed = &exp_pos->exp_filter_data;
1929 LASSERT(fed->fed_cached <= maxsize);
1930 LASSERT(fed->fed_grant <= maxsize);
1931 tot_cached += fed->fed_cached;
1932 tot_granted += fed->fed_grant;
1934 LASSERT(tot_cached == filter->fo_tot_cached);
1935 LASSERT(tot_granted == filter->fo_tot_granted);
1936 LASSERT(tot_cached <= maxsize);
1937 LASSERT(tot_granted <= maxsize);
1940 static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1941 unsigned long max_age)
1943 struct filter_obd *filter = &obd->u.filter;
1945 int blockbits = filter->fo_sb->s_blocksize_bits;
1949 /* at least try to account for cached pages. its still racey and
1950 * might be under-reporting if clients haven't announced their
1951 * caches with brw recently */
1952 spin_lock(&obd->obd_osfs_lock);
1953 rc = fsfilt_statfs(obd, filter->fo_sb, max_age);
1954 memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
1955 filter_grant_sanity_check(obd, filter, osfs->os_blocks << blockbits);
1956 cached = filter->fo_tot_cached + osfs->os_bsize - 1;
1957 spin_unlock(&obd->obd_osfs_lock);
1959 cached >>= blockbits;
1960 if (cached > osfs->os_bavail) {
1961 CERROR("cached "LPU64" > bavail "LPU64", clamping\n", cached,
1963 cached = osfs->os_bavail;
1965 osfs->os_bavail -= cached;
1966 osfs->os_bfree -= cached;
1971 static int filter_get_info(struct obd_export *exp, __u32 keylen,
1972 void *key, __u32 *vallen, void *val)
1974 struct obd_device *obd;
1977 obd = class_exp2obd(exp);
1979 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1980 exp->exp_handle.h_cookie);
1984 if (keylen == strlen("blocksize") &&
1985 memcmp(key, "blocksize", keylen) == 0) {
1986 __u32 *blocksize = val;
1987 *vallen = sizeof(*blocksize);
1988 *blocksize = obd->u.filter.fo_sb->s_blocksize;
1992 if (keylen == strlen("blocksize_bits") &&
1993 memcmp(key, "blocksize_bits", keylen) == 0) {
1994 __u32 *blocksize_bits = val;
1995 *vallen = sizeof(*blocksize_bits);
1996 *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits;
2000 if (keylen >= strlen("last_id") && memcmp(key, "last_id", 7) == 0) {
2001 obd_id *last_id = val;
2002 /* FIXME: object groups */
2003 *last_id = filter_last_id(&obd->u.filter, 0);
2006 CDEBUG(D_IOCTL, "invalid key\n");
2010 static int filter_set_info(struct obd_export *exp, __u32 keylen,
2011 void *key, __u32 vallen, void *val)
2013 struct obd_device *obd;
2014 struct lustre_handle conn;
2015 #ifdef ENABLE_ORPHANS
2016 struct llog_ctxt *ctxt;
2021 conn.cookie = exp->exp_handle.h_cookie;
2025 CDEBUG(D_IOCTL, "invalid exp %p cookie "LPX64"\n",
2030 if (keylen < strlen("mds_conn") ||
2031 memcmp(key, "mds_conn", keylen) != 0)
2034 CWARN("Received MDS connection ("LPX64")\n", conn.cookie);
2035 memcpy(&obd->u.filter.fo_mdc_conn, &conn, sizeof(conn));
2036 #ifdef ENABLE_ORPHANS
2037 ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
2038 rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
2043 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
2044 int len, void *karg, void *uarg)
2046 struct obd_device *obd = exp->exp_obd;
2047 struct obd_ioctl_data *data = karg;
2051 case OBD_IOC_ABORT_RECOVERY:
2052 CERROR("aborting recovery for device %s\n", obd->obd_name);
2053 target_abort_recovery(obd);
2056 case OBD_IOC_SET_READONLY: {
2058 struct super_block *sb = obd->u.filter.fo_sb;
2059 struct inode *inode = sb->s_root->d_inode;
2060 BDEVNAME_DECLARE_STORAGE(tmp);
2061 CERROR("setting device %s read-only\n",
2062 ll_bdevname(sb, tmp));
2064 handle = fsfilt_start(obd, inode, FSFILT_OP_MKNOD, NULL);
2066 (void)fsfilt_commit(obd, inode, handle, 1);
2068 dev_set_rdonly(ll_sbdev(obd->u.filter.fo_sb), 2);
2072 case OBD_IOC_CATLOGLIST: {
2073 rc = llog_catlog_list(obd, 1, data);
2077 case OBD_IOC_LLOG_CANCEL:
2078 case OBD_IOC_LLOG_REMOVE:
2079 case OBD_IOC_LLOG_INFO:
2080 case OBD_IOC_LLOG_PRINT: {
2081 /* FIXME to be finished */
2082 RETURN(-EOPNOTSUPP);
2084 struct llog_ctxt *ctxt = NULL;
2086 push_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2087 rc = llog_ioctl(ctxt, cmd, data);
2088 pop_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_ctxt, NULL);
2101 static struct llog_operations filter_unlink_repl_logops;
2102 static struct llog_operations filter_size_orig_logops = {
2103 lop_setup: llog_obd_origin_setup,
2104 lop_cleanup: llog_obd_origin_cleanup,
2105 lop_add: llog_obd_origin_add
2108 static int filter_llog_init(struct obd_device *obd, struct obd_device *tgt,
2109 int count, struct llog_logid *logid)
2111 struct llog_ctxt *ctxt;
2115 filter_unlink_repl_logops = llog_client_ops;
2116 filter_unlink_repl_logops.lop_cancel = llog_obd_repl_cancel;
2117 filter_unlink_repl_logops.lop_connect = llog_repl_connect;
2118 filter_unlink_repl_logops.lop_sync = llog_obd_repl_sync;
2120 rc = llog_setup(obd, LLOG_UNLINK_REPL_CTXT, tgt, 0, NULL,
2121 &filter_unlink_repl_logops);
2124 /* FIXME - assign unlink_cb for filter's recovery */
2125 ctxt = llog_get_context(obd, LLOG_UNLINK_REPL_CTXT);
2126 ctxt->llog_proc_cb = filter_recov_log_unlink_cb;
2128 rc = llog_setup(obd, LLOG_SIZE_ORIG_CTXT, tgt, 0, NULL,
2129 &filter_size_orig_logops);
2133 static int filter_llog_finish(struct obd_device *obd, int count)
2138 rc = llog_cleanup(llog_get_context(obd, LLOG_UNLINK_REPL_CTXT));
2142 rc = llog_cleanup(llog_get_context(obd, LLOG_SIZE_ORIG_CTXT));
2146 static struct dentry *filter_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr,
2149 return filter_fid2dentry(data, NULL, gr, id);
2152 static struct lvfs_callback_ops filter_lvfs_ops = {
2153 l_fid2dentry: filter_lvfs_fid2dentry,
2156 static struct obd_ops filter_obd_ops = {
2157 o_owner: THIS_MODULE,
2158 o_attach: filter_attach,
2159 o_detach: filter_detach,
2160 o_get_info: filter_get_info,
2161 o_set_info: filter_set_info,
2162 o_setup: filter_setup,
2163 o_postsetup: filter_postsetup,
2164 o_precleanup: filter_precleanup,
2165 o_cleanup: filter_cleanup,
2166 o_connect: filter_connect,
2167 o_disconnect: filter_disconnect,
2168 o_statfs: filter_statfs,
2169 o_getattr: filter_getattr,
2170 o_unpackmd: filter_unpackmd,
2171 o_create: filter_create,
2172 o_setattr: filter_setattr,
2173 o_destroy: filter_destroy,
2175 o_punch: filter_truncate,
2176 o_sync: filter_sync,
2177 o_preprw: filter_preprw,
2178 o_commitrw: filter_commitrw,
2179 o_destroy_export: filter_destroy_export,
2180 o_llog_init: filter_llog_init,
2181 o_llog_finish: filter_llog_finish,
2182 o_iocontrol: filter_iocontrol,
2185 static struct obd_ops filter_sanobd_ops = {
2186 o_owner: THIS_MODULE,
2187 o_attach: filter_attach,
2188 o_detach: filter_detach,
2189 o_get_info: filter_get_info,
2190 o_set_info: filter_set_info,
2191 o_setup: filter_san_setup,
2192 o_precleanup: filter_precleanup,
2193 o_cleanup: filter_cleanup,
2194 o_connect: filter_connect,
2195 o_disconnect: filter_disconnect,
2196 o_statfs: filter_statfs,
2197 o_getattr: filter_getattr,
2198 o_unpackmd: filter_unpackmd,
2199 o_create: filter_create,
2200 o_setattr: filter_setattr,
2201 o_destroy: filter_destroy,
2203 o_punch: filter_truncate,
2204 o_sync: filter_sync,
2205 o_preprw: filter_preprw,
2206 o_commitrw: filter_commitrw,
2207 o_san_preprw: filter_san_preprw,
2208 o_destroy_export: filter_destroy_export,
2209 o_llog_init: filter_llog_init,
2210 o_llog_finish: filter_llog_finish,
2211 o_iocontrol: filter_iocontrol,
2214 static int __init obdfilter_init(void)
2216 struct lprocfs_static_vars lvars;
2219 printk(KERN_INFO "Lustre: Filtering OBD driver; info@clusterfs.com\n");
2221 lprocfs_init_vars(filter, &lvars);
2223 rc = class_register_type(&filter_obd_ops, lvars.module_vars,
2224 OBD_FILTER_DEVICENAME);
2228 rc = class_register_type(&filter_sanobd_ops, lvars.module_vars,
2229 OBD_FILTER_SAN_DEVICENAME);
2231 class_unregister_type(OBD_FILTER_DEVICENAME);
2235 static void __exit obdfilter_exit(void)
2237 class_unregister_type(OBD_FILTER_SAN_DEVICENAME);
2238 class_unregister_type(OBD_FILTER_DEVICENAME);
2241 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2242 MODULE_DESCRIPTION("Lustre Filtering OBD driver");
2243 MODULE_LICENSE("GPL");
2245 module_init(obdfilter_init);
2246 module_exit(obdfilter_exit);