4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mdd/mdd_device.c
38 * Lustre Metadata Server (mdd) routines
40 * Author: Wang Di <wangdi@clusterfs.com>
43 #define DEBUG_SUBSYSTEM S_MDS
45 #include <linux/module.h>
46 #include <linux/kthread.h>
47 #include <obd_class.h>
48 #include <lustre_ioctl.h>
49 #include <lustre_mds.h>
50 #include <obd_support.h>
51 #include <lu_object.h>
52 #include <lustre_param.h>
53 #include <lustre_fid.h>
55 #include "mdd_internal.h"
57 static const struct md_device_operations mdd_ops;
58 static struct lu_device_type mdd_device_type;
60 static const char mdd_root_dir_name[] = "ROOT";
61 static const char mdd_obf_dir_name[] = "fid";
62 static const char mdd_lpf_dir_name[] = "lost+found";
64 /* Slab for MDD object allocation */
65 struct kmem_cache *mdd_object_kmem;
67 static struct lu_kmem_descr mdd_caches[] = {
69 .ckd_cache = &mdd_object_kmem,
70 .ckd_name = "mdd_obj",
71 .ckd_size = sizeof(struct mdd_object)
78 static int mdd_connect_to_next(const struct lu_env *env, struct mdd_device *m,
81 struct obd_connect_data *data = NULL;
82 struct lu_device *lud = mdd2lu_dev(m);
83 struct obd_device *obd;
87 LASSERT(m->mdd_child_exp == NULL);
89 OBD_ALLOC(data, sizeof(*data));
91 GOTO(out, rc = -ENOMEM);
93 obd = class_name2obd(nextdev);
95 CERROR("can't locate next device: %s\n", nextdev);
96 GOTO(out, rc = -ENOTCONN);
99 data->ocd_connect_flags = OBD_CONNECT_VERSION;
100 data->ocd_version = LUSTRE_VERSION_CODE;
102 rc = obd_connect(NULL, &m->mdd_child_exp, obd, &obd->obd_uuid, data, NULL);
104 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
108 lud->ld_site = m->mdd_child_exp->exp_obd->obd_lu_dev->ld_site;
109 LASSERT(lud->ld_site);
110 m->mdd_child = lu2dt_dev(m->mdd_child_exp->exp_obd->obd_lu_dev);
111 m->mdd_bottom = lu2dt_dev(lud->ld_site->ls_bottom_dev);
112 lu_dev_add_linkage(lud->ld_site, lud);
116 OBD_FREE(data, sizeof(*data));
120 static int mdd_init0(const struct lu_env *env, struct mdd_device *mdd,
121 struct lu_device_type *t, struct lustre_cfg *lcfg)
127 dev = lustre_cfg_string(lcfg, 0);
131 mdd->mdd_md_dev.md_lu_dev.ld_obd = class_name2obd(dev);
132 if (mdd->mdd_md_dev.md_lu_dev.ld_obd == NULL)
134 mdd->mdd_md_dev.md_lu_dev.ld_ops = &mdd_lu_ops;
135 mdd->mdd_md_dev.md_ops = &mdd_ops;
137 rc = mdd_connect_to_next(env, mdd, lustre_cfg_string(lcfg, 3));
141 mdd->mdd_atime_diff = MAX_ATIME_DIFF;
142 /* sync permission changes */
143 mdd->mdd_sync_permission = 1;
145 dt_conf_get(env, mdd->mdd_child, &mdd->mdd_dt_conf);
147 /* we are using service name but not mdd obd name
148 * for compatibility reasons.
149 * It is passed from MDT in lustre_cfg[2] buffer */
150 rc = mdd_procfs_init(mdd, lustre_cfg_string(lcfg, 2));
152 obd_disconnect(mdd->mdd_child_exp);
157 static struct lu_device *mdd_device_fini(const struct lu_env *env,
160 struct mdd_device *mdd = lu2mdd_dev(d);
163 lu_dev_del_linkage(d->ld_site, d);
165 mdd_procfs_fini(mdd);
169 static int changelog_init_cb(const struct lu_env *env, struct llog_handle *llh,
170 struct llog_rec_hdr *hdr, void *data)
172 struct mdd_device *mdd = (struct mdd_device *)data;
173 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
175 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
176 LASSERT(rec->cr_hdr.lrh_type == CHANGELOG_REC);
179 "seeing record at index %d/%d/"LPU64" t=%x %.*s in log"
180 DOSTID"\n", hdr->lrh_index, rec->cr_hdr.lrh_index,
181 rec->cr.cr_index, rec->cr.cr_type, rec->cr.cr_namelen,
182 changelog_rec_name(&rec->cr), POSTID(&llh->lgh_id.lgl_oi));
184 mdd->mdd_cl.mc_index = rec->cr.cr_index;
185 return LLOG_PROC_BREAK;
188 static int changelog_user_init_cb(const struct lu_env *env,
189 struct llog_handle *llh,
190 struct llog_rec_hdr *hdr, void *data)
192 struct mdd_device *mdd = (struct mdd_device *)data;
193 struct llog_changelog_user_rec *rec =
194 (struct llog_changelog_user_rec *)hdr;
196 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
197 LASSERT(rec->cur_hdr.lrh_type == CHANGELOG_USER_REC);
199 CDEBUG(D_INFO, "seeing user at index %d/%d id=%d endrec="LPU64
200 " in log "DOSTID"\n", hdr->lrh_index, rec->cur_hdr.lrh_index,
201 rec->cur_id, rec->cur_endrec, POSTID(&llh->lgh_id.lgl_oi));
203 spin_lock(&mdd->mdd_cl.mc_user_lock);
204 mdd->mdd_cl.mc_lastuser = rec->cur_id;
205 if (rec->cur_endrec > mdd->mdd_cl.mc_index)
206 mdd->mdd_cl.mc_index = rec->cur_endrec;
207 spin_unlock(&mdd->mdd_cl.mc_user_lock);
209 return LLOG_PROC_BREAK;
212 static int llog_changelog_cancel_cb(const struct lu_env *env,
213 struct llog_handle *llh,
214 struct llog_rec_hdr *hdr, void *data)
216 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
217 struct llog_cookie cookie;
218 long long endrec = *(long long *)data;
223 /* This is always a (sub)log, not the catalog */
224 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
226 if (rec->cr.cr_index > endrec)
227 /* records are in order, so we're done */
228 RETURN(LLOG_PROC_BREAK);
230 cookie.lgc_lgl = llh->lgh_id;
231 cookie.lgc_index = hdr->lrh_index;
233 /* cancel them one at a time. I suppose we could store up the cookies
234 * and cancel them all at once; probably more efficient, but this is
235 * done as a user call, so who cares... */
236 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle, 1,
238 RETURN(rc < 0 ? rc : 0);
241 static int llog_changelog_cancel(const struct lu_env *env,
242 struct llog_ctxt *ctxt,
243 struct llog_cookie *cookies, int flags)
245 struct llog_handle *cathandle = ctxt->loc_handle;
250 /* This should only be called with the catalog handle */
251 LASSERT(cathandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
253 rc = llog_cat_process(env, cathandle, llog_changelog_cancel_cb,
254 (void *)cookies, 0, 0);
256 /* 0 or 1 means we're done */
259 CERROR("%s: cancel idx %u of catalog "DOSTID" rc=%d\n",
260 ctxt->loc_obd->obd_name, cathandle->lgh_last_idx,
261 POSTID(&cathandle->lgh_id.lgl_oi), rc);
266 static struct llog_operations changelog_orig_logops;
269 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on);
271 static int mdd_changelog_llog_init(const struct lu_env *env,
272 struct mdd_device *mdd)
274 struct obd_device *obd = mdd2obd_dev(mdd);
275 struct llog_ctxt *ctxt = NULL, *uctxt = NULL;
280 /* LU-2844 mdd setup failure should not cause umount oops */
281 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CHANGELOG_INIT))
284 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
285 obd->obd_lvfs_ctxt.dt = mdd->mdd_bottom;
286 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_ORIG_CTXT,
287 obd, &changelog_orig_logops);
289 CERROR("%s: changelog llog setup failed: rc = %d\n",
294 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
297 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
300 GOTO(out_cleanup, rc);
302 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
306 rc = llog_cat_reverse_process(env, ctxt->loc_handle,
307 changelog_init_cb, mdd);
310 CERROR("%s: changelog init failed: rc = %d\n", obd->obd_name,
315 CDEBUG(D_IOCTL, "changelog starting index="LPU64"\n",
316 mdd->mdd_cl.mc_index);
318 /* setup user changelog */
319 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_USER_ORIG_CTXT,
320 obd, &changelog_orig_logops);
322 CERROR("%s: changelog users llog setup failed: rc = %d\n",
327 uctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
330 rc = llog_open_create(env, uctxt, &uctxt->loc_handle, NULL,
333 GOTO(out_ucleanup, rc);
335 uctxt->loc_handle->lgh_logops->lop_add = llog_cat_add_rec;
336 uctxt->loc_handle->lgh_logops->lop_declare_add = llog_cat_declare_add_rec;
338 rc = llog_cat_init_and_process(env, uctxt->loc_handle);
340 GOTO(out_uclose, rc);
342 rc = llog_cat_reverse_process(env, uctxt->loc_handle,
343 changelog_user_init_cb, mdd);
345 CERROR("%s: changelog user init failed: rc = %d\n",
347 GOTO(out_uclose, rc);
350 /* If we have registered users, assume we want changelogs on */
351 if (mdd->mdd_cl.mc_lastuser > 0) {
352 rc = mdd_changelog_on(env, mdd, 1);
354 GOTO(out_uclose, rc);
357 llog_ctxt_put(uctxt);
360 llog_cat_close(env, uctxt->loc_handle);
362 llog_cleanup(env, uctxt);
364 llog_cat_close(env, ctxt->loc_handle);
366 llog_cleanup(env, ctxt);
370 static int mdd_changelog_init(const struct lu_env *env, struct mdd_device *mdd)
372 struct obd_device *obd = mdd2obd_dev(mdd);
375 mdd->mdd_cl.mc_index = 0;
376 spin_lock_init(&mdd->mdd_cl.mc_lock);
377 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
378 mdd->mdd_cl.mc_flags = 0; /* off by default */
379 mdd->mdd_cl.mc_mask = CHANGELOG_DEFMASK;
380 spin_lock_init(&mdd->mdd_cl.mc_user_lock);
381 mdd->mdd_cl.mc_lastuser = 0;
383 rc = mdd_changelog_llog_init(env, mdd);
385 CERROR("%s: changelog setup during init failed: rc = %d\n",
387 mdd->mdd_cl.mc_flags |= CLM_ERR;
393 static void mdd_changelog_fini(const struct lu_env *env,
394 struct mdd_device *mdd)
396 struct obd_device *obd = mdd2obd_dev(mdd);
397 struct llog_ctxt *ctxt;
399 mdd->mdd_cl.mc_flags = 0;
401 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
403 llog_cat_close(env, ctxt->loc_handle);
404 llog_cleanup(env, ctxt);
406 ctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
408 llog_cat_close(env, ctxt->loc_handle);
409 llog_cleanup(env, ctxt);
414 mdd_changelog_write_header(const struct lu_env *env, struct mdd_device *mdd,
417 /* Start / stop recording */
419 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on)
423 if ((on == 1) && ((mdd->mdd_cl.mc_flags & CLM_ON) == 0)) {
424 LCONSOLE_INFO("%s: changelog on\n", mdd2obd_dev(mdd)->obd_name);
425 if (mdd->mdd_cl.mc_flags & CLM_ERR) {
426 CERROR("Changelogs cannot be enabled due to error "
427 "condition (see %s log).\n",
428 mdd2obd_dev(mdd)->obd_name);
431 spin_lock(&mdd->mdd_cl.mc_lock);
432 mdd->mdd_cl.mc_flags |= CLM_ON;
433 spin_unlock(&mdd->mdd_cl.mc_lock);
434 rc = mdd_changelog_write_header(env, mdd, CLM_START);
436 } else if ((on == 0) && ((mdd->mdd_cl.mc_flags & CLM_ON) == CLM_ON)) {
437 LCONSOLE_INFO("%s: changelog off\n",mdd2obd_dev(mdd)->obd_name);
438 rc = mdd_changelog_write_header(env, mdd, CLM_FINI);
439 spin_lock(&mdd->mdd_cl.mc_lock);
440 mdd->mdd_cl.mc_flags &= ~CLM_ON;
441 spin_unlock(&mdd->mdd_cl.mc_lock);
446 /** Remove entries with indicies up to and including \a endrec from the
453 mdd_changelog_llog_cancel(const struct lu_env *env, struct mdd_device *mdd,
456 struct obd_device *obd = mdd2obd_dev(mdd);
457 struct llog_ctxt *ctxt;
458 long long unsigned cur;
461 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
465 spin_lock(&mdd->mdd_cl.mc_lock);
466 cur = (long long)mdd->mdd_cl.mc_index;
467 spin_unlock(&mdd->mdd_cl.mc_lock);
471 /* purge to "0" is shorthand for everything */
475 /* If purging all records, write a header entry so we don't have an
476 empty catalog and we're sure to have a valid starting index next
477 time. In case of crash, we just restart with old log so we're
480 /* XXX: transaction is started by llog itself */
481 rc = mdd_changelog_write_header(env, mdd, CLM_PURGE);
486 /* Some records were purged, so reset repeat-access time (so we
487 record new mtime update records, so users can see a file has been
488 changed since the last purge) */
489 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
491 rc = llog_cancel(env, ctxt, (struct llog_cookie *)&endrec, 0);
497 /** Add a CL_MARK record to the changelog
499 * \param markerflags - CLM_*
502 int mdd_changelog_write_header(const struct lu_env *env,
503 struct mdd_device *mdd, int markerflags)
505 struct obd_device *obd = mdd2obd_dev(mdd);
506 struct llog_changelog_rec *rec;
508 struct llog_ctxt *ctxt;
510 int len = strlen(obd->obd_name);
515 if (mdd->mdd_cl.mc_mask & (1 << CL_MARK)) {
516 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
520 reclen = llog_data_len(sizeof(*rec) + len);
521 buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
522 if (buf->lb_buf == NULL)
526 rec->cr.cr_flags = CLF_VERSION;
527 rec->cr.cr_type = CL_MARK;
528 rec->cr.cr_namelen = len;
529 memcpy(changelog_rec_name(&rec->cr), obd->obd_name, rec->cr.cr_namelen);
530 /* Status and action flags */
531 rec->cr.cr_markerflags = mdd->mdd_cl.mc_flags | markerflags;
532 rec->cr_hdr.lrh_len = llog_data_len(changelog_rec_size(&rec->cr) +
534 rec->cr_hdr.lrh_type = CHANGELOG_REC;
535 rec->cr.cr_time = cl_time();
536 spin_lock(&mdd->mdd_cl.mc_lock);
537 rec->cr.cr_index = ++mdd->mdd_cl.mc_index;
538 spin_unlock(&mdd->mdd_cl.mc_lock);
540 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
543 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cr_hdr, NULL);
548 /* assume on or off event; reset repeat-access time */
549 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
554 * Lookup method for "fid" object. Only filenames with correct SEQ:OID format
555 * are valid. We also check if object with passed fid exists or not.
557 static int obf_lookup(const struct lu_env *env, struct md_object *p,
558 const struct lu_name *lname, struct lu_fid *f,
559 struct md_op_spec *spec)
561 char *name = (char *)lname->ln_name;
562 struct mdd_device *mdd = mdo2mdd(p);
563 struct mdd_object *child;
569 sscanf(name, SFID, RFID(f));
570 if (!fid_is_sane(f)) {
571 CWARN("%s: Trying to lookup invalid FID [%s] in %s/%s, FID "
572 "format should be "DFID"\n", mdd2obd_dev(mdd)->obd_name,
573 lname->ln_name, dot_lustre_name, mdd_obf_dir_name,
574 (__u64)FID_SEQ_NORMAL, 1, 0);
575 GOTO(out, rc = -EINVAL);
578 if (!fid_is_norm(f) && !fid_is_igif(f) && !fid_is_root(f) &&
579 !fid_seq_is_dot(f->f_seq)) {
580 CWARN("%s: Trying to lookup invalid FID "DFID" in %s/%s, "
581 "sequence should be >= "LPX64" or within ["LPX64","
582 ""LPX64"].\n", mdd2obd_dev(mdd)->obd_name, PFID(f),
583 dot_lustre_name, mdd_obf_dir_name, (__u64)FID_SEQ_NORMAL,
584 (__u64)FID_SEQ_IGIF, (__u64)FID_SEQ_IGIF_MAX);
585 GOTO(out, rc = -EINVAL);
588 /* Check if object with this fid exists */
589 child = mdd_object_find(env, mdd, f);
591 GOTO(out, rc = PTR_ERR(child));
593 if (mdd_object_exists(child) == 0)
596 mdd_object_put(env, child);
602 static int mdd_dummy_create(const struct lu_env *env,
603 struct md_object *pobj,
604 const struct lu_name *lname,
605 struct md_object *child,
606 struct md_op_spec *spec,
612 static int mdd_dummy_rename(const struct lu_env *env,
613 struct md_object *src_pobj,
614 struct md_object *tgt_pobj,
615 const struct lu_fid *lf,
616 const struct lu_name *lsname,
617 struct md_object *tobj,
618 const struct lu_name *ltname,
624 static int mdd_dummy_link(const struct lu_env *env,
625 struct md_object *tgt_obj,
626 struct md_object *src_obj,
627 const struct lu_name *lname,
633 static int mdd_dummy_unlink(const struct lu_env *env,
634 struct md_object *pobj,
635 struct md_object *cobj,
636 const struct lu_name *lname,
643 static struct md_dir_operations mdd_obf_dir_ops = {
644 .mdo_lookup = obf_lookup,
645 .mdo_create = mdd_dummy_create,
646 .mdo_rename = mdd_dummy_rename,
647 .mdo_link = mdd_dummy_link,
648 .mdo_unlink = mdd_dummy_unlink
651 static struct md_dir_operations mdd_lpf_dir_ops = {
652 .mdo_lookup = mdd_lookup,
653 .mdo_create = mdd_dummy_create,
654 .mdo_rename = mdd_dummy_rename,
655 .mdo_link = mdd_dummy_link,
656 .mdo_unlink = mdd_dummy_unlink
659 static struct md_object *mdo_locate(const struct lu_env *env,
660 struct md_device *md,
661 const struct lu_fid *fid)
663 struct lu_object *obj;
664 struct md_object *mdo;
666 obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
668 obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
669 LASSERT(obj != NULL);
672 mdo = ERR_PTR(PTR_ERR(obj));
677 static int mdd_lpf_setup(const struct lu_env *env, struct mdd_device *m)
679 struct md_object *mdo;
680 struct mdd_object *mdd_lpf;
681 struct lu_fid fid = LU_LPF_FID;
685 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
686 mdd_lpf_dir_name, S_IFDIR | S_IRUSR | S_IXUSR,
691 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
693 RETURN(PTR_ERR(mdo));
695 LASSERT(lu_object_exists(&mdo->mo_lu));
697 mdd_lpf = md2mdd_obj(mdo);
698 mdd_lpf->mod_obj.mo_dir_ops = &mdd_lpf_dir_ops;
699 m->mdd_dot_lustre_objs.mdd_lpf = mdd_lpf;
705 * Create special in-memory "fid" object for open-by-fid.
707 static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
709 struct md_object *mdo;
710 struct mdd_object *mdd_obf;
711 struct lu_fid fid = LU_OBF_FID;
714 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
715 mdd_obf_dir_name, S_IFDIR | S_IXUSR, &fid);
719 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
721 RETURN(PTR_ERR(mdo));
723 LASSERT(lu_object_exists(&mdo->mo_lu));
725 mdd_obf = md2mdd_obj(mdo);
726 mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
727 m->mdd_dot_lustre_objs.mdd_obf = mdd_obf;
732 static void mdd_dot_lustre_cleanup(const struct lu_env *env,
733 struct mdd_device *m)
735 if (m->mdd_dot_lustre_objs.mdd_lpf != NULL) {
736 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_lpf);
737 m->mdd_dot_lustre_objs.mdd_lpf = NULL;
739 if (m->mdd_dot_lustre_objs.mdd_obf != NULL) {
740 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
741 m->mdd_dot_lustre_objs.mdd_obf = NULL;
743 if (m->mdd_dot_lustre != NULL) {
744 mdd_object_put(env, m->mdd_dot_lustre);
745 m->mdd_dot_lustre = NULL;
749 /** Setup ".lustre" directory object */
750 static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
752 struct md_object *mdo;
757 /* Create ".lustre" directory in ROOT. */
758 fid = LU_DOT_LUSTRE_FID;
759 rc = mdd_local_file_create(env, m, &m->mdd_root_fid,
761 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO,
765 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
767 RETURN(PTR_ERR(mdo));
768 LASSERT(lu_object_exists(&mdo->mo_lu));
770 m->mdd_dot_lustre = md2mdd_obj(mdo);
772 rc = mdd_obf_setup(env, m);
774 CERROR("%s: error initializing \"fid\" object: rc = %d.\n",
775 mdd2obd_dev(m)->obd_name, rc);
779 rc = mdd_lpf_setup(env, m);
781 CERROR("%s: error initializing \"lost+found\": rc = %d.\n",
782 mdd2obd_dev(m)->obd_name, rc);
789 mdd_dot_lustre_cleanup(env, m);
795 static struct llog_operations hsm_actions_logops;
798 * set llog methods and create LLOG_AGENT_ORIG_CTXT llog
799 * object in obd_device
801 static int mdd_hsm_actions_llog_init(const struct lu_env *env,
802 struct mdd_device *m)
804 struct obd_device *obd = mdd2obd_dev(m);
805 struct llog_ctxt *ctxt = NULL;
809 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
810 obd->obd_lvfs_ctxt.dt = m->mdd_bottom;
812 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_AGENT_ORIG_CTXT,
813 obd, &hsm_actions_logops);
815 CERROR("%s: hsm actions llog setup failed: rc = %d\n",
820 ctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
823 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
826 CERROR("%s: hsm actions llog open_create failed: rc = %d\n",
828 GOTO(out_cleanup, rc);
831 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
839 llog_cat_close(env, ctxt->loc_handle);
840 ctxt->loc_handle = NULL;
842 llog_cleanup(env, ctxt);
848 * cleanup the context created by llog_setup_named()
850 static int mdd_hsm_actions_llog_fini(const struct lu_env *env,
851 struct mdd_device *m)
853 struct obd_device *obd = mdd2obd_dev(m);
854 struct llog_ctxt *lctxt;
857 lctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
859 llog_cat_close(env, lctxt->loc_handle);
860 lctxt->loc_handle = NULL;
861 llog_cleanup(env, lctxt);
867 static void mdd_device_shutdown(const struct lu_env *env, struct mdd_device *m,
868 struct lustre_cfg *cfg)
870 mdd_generic_thread_stop(&m->mdd_orph_cleanup_thread);
871 lfsck_degister(env, m->mdd_bottom);
872 mdd_hsm_actions_llog_fini(env, m);
873 mdd_changelog_fini(env, m);
874 orph_index_fini(env, m);
875 mdd_dot_lustre_cleanup(env, m);
876 if (m->mdd_los != NULL) {
877 local_oid_storage_fini(env, m->mdd_los);
880 lu_site_purge(env, mdd2lu_dev(m)->ld_site, ~0);
882 if (m->mdd_child_exp)
883 obd_disconnect(m->mdd_child_exp);
886 static int mdd_process_config(const struct lu_env *env,
887 struct lu_device *d, struct lustre_cfg *cfg)
889 struct mdd_device *m = lu2mdd_dev(d);
890 struct dt_device *dt = m->mdd_child;
891 struct lu_device *next = &dt->dd_lu_dev;
895 switch (cfg->lcfg_command) {
897 struct obd_device *obd = mdd2obd_dev(m);
899 rc = class_process_proc_param(PARAM_MDD, obd->obd_vars, cfg, m);
900 if (rc > 0 || rc == -ENOSYS)
901 /* we don't understand; pass it on */
902 rc = next->ld_ops->ldo_process_config(env, next, cfg);
906 rc = next->ld_ops->ldo_process_config(env, next, cfg);
909 dt_conf_get(env, dt, &m->mdd_dt_conf);
912 rc = next->ld_ops->ldo_process_config(env, next, cfg);
913 lu_dev_del_linkage(d->ld_site, d);
914 mdd_device_shutdown(env, m, cfg);
917 rc = next->ld_ops->ldo_process_config(env, next, cfg);
924 static int mdd_recovery_complete(const struct lu_env *env,
927 struct mdd_device *mdd = lu2mdd_dev(d);
928 struct lu_device *next;
932 LASSERT(mdd != NULL);
933 next = &mdd->mdd_child->dd_lu_dev;
935 /* XXX: orphans handling. */
936 mdd_orphan_cleanup(env, mdd);
937 rc = next->ld_ops->ldo_recovery_complete(env, next);
942 int mdd_local_file_create(const struct lu_env *env, struct mdd_device *mdd,
943 const struct lu_fid *pfid, const char *name,
944 __u32 mode, struct lu_fid *fid)
946 struct dt_object *parent, *dto;
951 LASSERT(!fid_is_zero(pfid));
952 parent = dt_locate(env, mdd->mdd_bottom, pfid);
953 if (unlikely(IS_ERR(parent)))
954 RETURN(PTR_ERR(parent));
956 /* create local file/dir, if @fid is passed then try to use it */
957 if (fid_is_zero(fid))
958 dto = local_file_find_or_create(env, mdd->mdd_los, parent,
961 dto = local_file_find_or_create_with_fid(env, mdd->mdd_bottom,
965 GOTO(out_put, rc = PTR_ERR(dto));
966 *fid = *lu_object_fid(&dto->do_lu);
967 /* since stack is not fully set up the local_storage uses own stack
968 * and we should drop its object from cache */
969 lu_object_put_nocache(env, &dto->do_lu);
972 lu_object_put(env, &parent->do_lu);
976 static int mdd_lfsck_out_notify(const struct lu_env *env, void *data,
977 enum lfsck_events event)
982 static int mdd_prepare(const struct lu_env *env,
983 struct lu_device *pdev,
984 struct lu_device *cdev)
986 struct mdd_device *mdd = lu2mdd_dev(cdev);
987 struct lu_device *next = &mdd->mdd_child->dd_lu_dev;
993 rc = next->ld_ops->ldo_prepare(env, cdev, next);
997 /* Setup local dirs */
998 fid.f_seq = FID_SEQ_LOCAL_NAME;
1001 rc = local_oid_storage_init(env, mdd->mdd_bottom, &fid,
1006 rc = dt_root_get(env, mdd->mdd_child, &mdd->mdd_local_root_fid);
1011 if (mdd_seq_site(mdd)->ss_node_id == 0) {
1012 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
1013 mdd_root_dir_name, S_IFDIR |
1014 S_IRUGO | S_IWUSR | S_IXUGO, &fid);
1016 CERROR("%s: create root fid failed: rc = %d\n",
1017 mdd2obd_dev(mdd)->obd_name, rc);
1021 mdd->mdd_root_fid = fid;
1022 rc = mdd_dot_lustre_setup(env, mdd);
1024 CERROR("%s: initializing .lustre failed: rc = %d\n",
1025 mdd2obd_dev(mdd)->obd_name, rc);
1029 /* Normal client usually send root access to MDT0 directly,
1030 * the root FID on non-MDT0 will only be used by echo client. */
1031 mdd->mdd_root_fid = fid;
1034 rc = orph_index_init(env, mdd);
1038 rc = mdd_changelog_init(env, mdd);
1040 CERROR("%s: failed to initialize changelog: rc = %d\n",
1041 mdd2obd_dev(mdd)->obd_name, rc);
1045 rc = mdd_hsm_actions_llog_init(env, mdd);
1047 GOTO(out_changelog, rc);
1049 rc = lfsck_register(env, mdd->mdd_bottom, mdd->mdd_child,
1050 mdd2obd_dev(mdd), mdd_lfsck_out_notify,
1053 CERROR("%s: failed to initialize lfsck: rc = %d\n",
1054 mdd2obd_dev(mdd)->obd_name, rc);
1059 mdd_hsm_actions_llog_fini(env, mdd);
1061 mdd_changelog_fini(env, mdd);
1063 orph_index_fini(env, mdd);
1065 if (mdd_seq_site(mdd)->ss_node_id == 0)
1066 mdd_dot_lustre_cleanup(env, mdd);
1068 local_oid_storage_fini(env, mdd->mdd_los);
1069 mdd->mdd_los = NULL;
1074 const struct lu_device_operations mdd_lu_ops = {
1075 .ldo_object_alloc = mdd_object_alloc,
1076 .ldo_process_config = mdd_process_config,
1077 .ldo_recovery_complete = mdd_recovery_complete,
1078 .ldo_prepare = mdd_prepare,
1081 static int mdd_root_get(const struct lu_env *env,
1082 struct md_device *m, struct lu_fid *f)
1084 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1087 *f = mdd->mdd_root_fid;
1092 * No permission check is needed.
1094 static int mdd_statfs(const struct lu_env *env, struct md_device *m,
1095 struct obd_statfs *sfs)
1097 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1102 rc = mdd_child_ops(mdd)->dt_statfs(env, mdd->mdd_child, sfs);
1104 sfs->os_namelen = min_t(__u32, sfs->os_namelen, NAME_MAX);
1109 static int mdd_maxeasize_get(const struct lu_env *env, struct md_device *m,
1112 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1115 *easize = mdd->mdd_dt_conf.ddp_max_ea_size;
1120 static int mdd_llog_ctxt_get(const struct lu_env *env, struct md_device *m,
1123 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1125 *h = llog_group_get_ctxt(&mdd2obd_dev(mdd)->obd_olg, idx);
1126 return (*h == NULL ? -ENOENT : 0);
1129 static struct lu_device *mdd_device_free(const struct lu_env *env,
1130 struct lu_device *lu)
1132 struct mdd_device *m = lu2mdd_dev(lu);
1135 LASSERT(atomic_read(&lu->ld_ref) == 0);
1136 md_device_fini(&m->mdd_md_dev);
1141 static struct lu_device *mdd_device_alloc(const struct lu_env *env,
1142 struct lu_device_type *t,
1143 struct lustre_cfg *lcfg)
1145 struct lu_device *l;
1146 struct mdd_device *m;
1150 l = ERR_PTR(-ENOMEM);
1155 md_device_init(&m->mdd_md_dev, t);
1156 rc = mdd_init0(env, m, t, lcfg);
1158 mdd_device_free(env, l);
1167 * we use exports to track all mdd users
1169 static int mdd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1170 struct obd_device *obd, struct obd_uuid *cluuid,
1171 struct obd_connect_data *data, void *localdata)
1173 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1174 struct lustre_handle conn;
1178 CDEBUG(D_CONFIG, "connect #%d\n", mdd->mdd_connects);
1180 rc = class_connect(&conn, obd, cluuid);
1184 *exp = class_conn2export(&conn);
1186 /* Why should there ever be more than 1 connect? */
1187 LASSERT(mdd->mdd_connects == 0);
1188 mdd->mdd_connects++;
1194 * once last export (we don't count self-export) disappeared
1195 * mdd can be released
1197 static int mdd_obd_disconnect(struct obd_export *exp)
1199 struct obd_device *obd = exp->exp_obd;
1200 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1201 int rc, release = 0;
1204 mdd->mdd_connects--;
1205 if (mdd->mdd_connects == 0)
1208 rc = class_disconnect(exp);
1210 if (rc == 0 && release)
1211 class_manual_cleanup(obd);
1215 static int mdd_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1216 __u32 keylen, void *key, __u32 *vallen, void *val)
1220 if (KEY_IS(KEY_OSP_CONNECTED)) {
1221 struct obd_device *obd = exp->exp_obd;
1222 struct mdd_device *mdd;
1224 if (!obd->obd_set_up || obd->obd_stopping)
1227 mdd = lu2mdd_dev(obd->obd_lu_dev);
1229 rc = obd_get_info(env, mdd->mdd_child_exp, keylen, key, vallen,
1237 static int mdd_obd_set_info_async(const struct lu_env *env,
1238 struct obd_export *exp,
1239 __u32 keylen, void *key,
1240 __u32 vallen, void *val,
1241 struct ptlrpc_request_set *set)
1243 struct obd_device *obd = exp->exp_obd;
1244 struct mdd_device *mdd;
1247 if (!obd->obd_set_up || obd->obd_stopping)
1250 mdd = lu2mdd_dev(obd->obd_lu_dev);
1252 rc = obd_set_info_async(env, mdd->mdd_child_exp, keylen, key,
1257 static struct obd_ops mdd_obd_device_ops = {
1258 .o_owner = THIS_MODULE,
1259 .o_connect = mdd_obd_connect,
1260 .o_disconnect = mdd_obd_disconnect,
1261 .o_get_info = mdd_obd_get_info,
1262 .o_set_info_async = mdd_obd_set_info_async,
1265 static int mdd_changelog_user_register(const struct lu_env *env,
1266 struct mdd_device *mdd, int *id)
1268 struct llog_ctxt *ctxt;
1269 struct llog_changelog_user_rec *rec;
1273 ctxt = llog_get_context(mdd2obd_dev(mdd),
1274 LLOG_CHANGELOG_USER_ORIG_CTXT);
1280 llog_ctxt_put(ctxt);
1284 /* Assume we want it on since somebody registered */
1285 rc = mdd_changelog_on(env, mdd, 1);
1289 rec->cur_hdr.lrh_len = sizeof(*rec);
1290 rec->cur_hdr.lrh_type = CHANGELOG_USER_REC;
1291 spin_lock(&mdd->mdd_cl.mc_user_lock);
1292 if (mdd->mdd_cl.mc_lastuser == (unsigned int)(-1)) {
1293 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1294 CERROR("Maximum number of changelog users exceeded!\n");
1295 GOTO(out, rc = -EOVERFLOW);
1297 *id = rec->cur_id = ++mdd->mdd_cl.mc_lastuser;
1298 rec->cur_endrec = mdd->mdd_cl.mc_index;
1299 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1301 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cur_hdr, NULL);
1303 CDEBUG(D_IOCTL, "Registered changelog user %d\n", *id);
1306 llog_ctxt_put(ctxt);
1310 struct mdd_changelog_user_data {
1311 __u64 mcud_endrec; /**< purge record for this user */
1312 __u64 mcud_minrec; /**< lowest changelog recno still referenced */
1314 __u32 mcud_minid; /**< user id with lowest rec reference */
1315 __u32 mcud_usercount;
1316 unsigned int mcud_found:1;
1318 #define MCUD_UNREGISTER -1LL
1321 * 1. Find the smallest record everyone is willing to purge
1322 * 2. Update the last purgeable record for this user
1324 static int mdd_changelog_user_purge_cb(const struct lu_env *env,
1325 struct llog_handle *llh,
1326 struct llog_rec_hdr *hdr, void *data)
1328 struct llog_changelog_user_rec *rec;
1329 struct mdd_changelog_user_data *mcud = data;
1334 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
1336 rec = (struct llog_changelog_user_rec *)hdr;
1338 mcud->mcud_usercount++;
1340 /* If we have a new endrec for this id, use it for the following
1341 min check instead of its old value */
1342 if (rec->cur_id == mcud->mcud_id)
1343 rec->cur_endrec = max(rec->cur_endrec, mcud->mcud_endrec);
1345 /* Track the minimum referenced record */
1346 if (mcud->mcud_minid == 0 || mcud->mcud_minrec > rec->cur_endrec) {
1347 mcud->mcud_minid = rec->cur_id;
1348 mcud->mcud_minrec = rec->cur_endrec;
1351 if (rec->cur_id != mcud->mcud_id)
1354 /* Update this user's record */
1355 mcud->mcud_found = 1;
1357 /* Special case: unregister this user */
1358 if (mcud->mcud_endrec == MCUD_UNREGISTER) {
1359 struct llog_cookie cookie;
1361 cookie.lgc_lgl = llh->lgh_id;
1362 cookie.lgc_index = hdr->lrh_index;
1364 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
1367 mcud->mcud_usercount--;
1372 /* Update the endrec */
1373 CDEBUG(D_IOCTL, "Rewriting changelog user %d endrec to "LPU64"\n",
1374 mcud->mcud_id, rec->cur_endrec);
1376 rc = llog_write(env, llh, hdr, hdr->lrh_index);
1381 static int mdd_changelog_user_purge(const struct lu_env *env,
1382 struct mdd_device *mdd, int id,
1385 struct mdd_changelog_user_data data;
1386 struct llog_ctxt *ctxt;
1390 CDEBUG(D_IOCTL, "Purge request: id=%d, endrec=%lld\n", id, endrec);
1393 data.mcud_minid = 0;
1394 data.mcud_minrec = 0;
1395 data.mcud_usercount = 0;
1396 data.mcud_endrec = endrec;
1397 spin_lock(&mdd->mdd_cl.mc_lock);
1398 endrec = mdd->mdd_cl.mc_index;
1399 spin_unlock(&mdd->mdd_cl.mc_lock);
1400 if ((data.mcud_endrec == 0) ||
1401 ((data.mcud_endrec > endrec) &&
1402 (data.mcud_endrec != MCUD_UNREGISTER)))
1403 data.mcud_endrec = endrec;
1405 ctxt = llog_get_context(mdd2obd_dev(mdd),
1406 LLOG_CHANGELOG_USER_ORIG_CTXT);
1410 LASSERT(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
1412 rc = llog_cat_process(env, ctxt->loc_handle,
1413 mdd_changelog_user_purge_cb, (void *)&data,
1415 if ((rc >= 0) && (data.mcud_minrec > 0)) {
1416 CDEBUG(D_IOCTL, "Purging changelog entries up to "LPD64
1417 ", referenced by "CHANGELOG_USER_PREFIX"%d\n",
1418 data.mcud_minrec, data.mcud_minid);
1419 rc = mdd_changelog_llog_cancel(env, mdd, data.mcud_minrec);
1421 CWARN("Could not determine changelog records to purge; rc=%d\n",
1425 llog_ctxt_put(ctxt);
1427 if (!data.mcud_found) {
1428 CWARN("No entry for user %d. Last changelog reference is "
1429 LPD64" by changelog user %d\n", data.mcud_id,
1430 data.mcud_minrec, data.mcud_minid);
1434 if (!rc && data.mcud_usercount == 0)
1435 /* No more users; turn changelogs off */
1436 rc = mdd_changelog_on(env, mdd, 0);
1442 * May be called remotely from mdt_iocontrol_handle or locally from
1443 * mdt_iocontrol. Data may be freeform - remote handling doesn't enforce
1444 * an obd_ioctl_data format (but local ioctl handler does).
1446 * \param len - data len
1447 * \param karg - ioctl data, in kernel space
1449 static int mdd_iocontrol(const struct lu_env *env, struct md_device *m,
1450 unsigned int cmd, int len, void *karg)
1452 struct mdd_device *mdd;
1453 struct obd_ioctl_data *data = karg;
1457 mdd = lu2mdd_dev(&m->md_lu_dev);
1459 /* Doesn't use obd_ioctl_data */
1461 case OBD_IOC_CHANGELOG_CLEAR: {
1462 struct changelog_setinfo *cs = karg;
1463 rc = mdd_changelog_user_purge(env, mdd, cs->cs_id,
1467 case OBD_IOC_GET_MNTOPT: {
1468 mntopt_t *mntopts = (mntopt_t *)karg;
1469 *mntopts = mdd->mdd_dt_conf.ddp_mntopts;
1472 case OBD_IOC_START_LFSCK: {
1473 rc = lfsck_start(env, mdd->mdd_bottom,
1474 (struct lfsck_start_param *)karg);
1477 case OBD_IOC_STOP_LFSCK: {
1478 rc = lfsck_stop(env, mdd->mdd_bottom,
1479 (struct lfsck_stop *)karg);
1484 /* Below ioctls use obd_ioctl_data */
1485 if (len != sizeof(*data)) {
1486 CERROR("Bad ioctl size %d\n", len);
1489 if (data->ioc_version != OBD_IOCTL_VERSION) {
1490 CERROR("Bad magic %x != %x\n", data->ioc_version,
1496 case OBD_IOC_CHANGELOG_REG:
1497 rc = mdd_changelog_user_register(env, mdd, &data->ioc_u32_1);
1499 case OBD_IOC_CHANGELOG_DEREG:
1500 rc = mdd_changelog_user_purge(env, mdd, data->ioc_u32_1,
1510 /* type constructor/destructor: mdd_type_init, mdd_type_fini */
1511 LU_TYPE_INIT_FINI(mdd, &mdd_thread_key);
1513 static const struct md_device_operations mdd_ops = {
1514 .mdo_statfs = mdd_statfs,
1515 .mdo_root_get = mdd_root_get,
1516 .mdo_llog_ctxt_get = mdd_llog_ctxt_get,
1517 .mdo_iocontrol = mdd_iocontrol,
1518 .mdo_maxeasize_get = mdd_maxeasize_get,
1521 static struct lu_device_type_operations mdd_device_type_ops = {
1522 .ldto_init = mdd_type_init,
1523 .ldto_fini = mdd_type_fini,
1525 .ldto_start = mdd_type_start,
1526 .ldto_stop = mdd_type_stop,
1528 .ldto_device_alloc = mdd_device_alloc,
1529 .ldto_device_free = mdd_device_free,
1531 .ldto_device_fini = mdd_device_fini
1534 static struct lu_device_type mdd_device_type = {
1535 .ldt_tags = LU_DEVICE_MD,
1536 .ldt_name = LUSTRE_MDD_NAME,
1537 .ldt_ops = &mdd_device_type_ops,
1538 .ldt_ctx_tags = LCT_MD_THREAD
1541 /* context key constructor: mdd_key_init */
1542 LU_KEY_INIT(mdd, struct mdd_thread_info);
1544 static void mdd_key_fini(const struct lu_context *ctx,
1545 struct lu_context_key *key, void *data)
1547 struct mdd_thread_info *info = data;
1549 lu_buf_free(&info->mti_big_buf);
1550 lu_buf_free(&info->mti_link_buf);
1555 /* context key: mdd_thread_key */
1556 LU_CONTEXT_KEY_DEFINE(mdd, LCT_MD_THREAD);
1558 int mdd_generic_thread_start(struct mdd_generic_thread *thread,
1559 int (*func)(void *), void *data, char *name)
1561 struct task_struct *task;
1563 LASSERT(thread->mgt_init == false);
1564 init_completion(&thread->mgt_started);
1565 init_completion(&thread->mgt_finished);
1566 thread->mgt_data = data;
1567 thread->mgt_abort = false;
1568 thread->mgt_init = true;
1570 task = kthread_run(func, thread, name);
1572 complete(&thread->mgt_finished);
1573 return PTR_ERR(task);
1575 wait_for_completion(&thread->mgt_started);
1579 void mdd_generic_thread_stop(struct mdd_generic_thread *thread)
1581 if (thread->mgt_init == true) {
1582 thread->mgt_abort = true;
1583 wait_for_completion(&thread->mgt_finished);
1587 static int __init mdd_mod_init(void)
1591 rc = lu_kmem_init(mdd_caches);
1595 changelog_orig_logops = llog_osd_ops;
1596 changelog_orig_logops.lop_cancel = llog_changelog_cancel;
1597 changelog_orig_logops.lop_add = llog_cat_add_rec;
1598 changelog_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1600 hsm_actions_logops = llog_osd_ops;
1601 hsm_actions_logops.lop_add = llog_cat_add_rec;
1602 hsm_actions_logops.lop_declare_add = llog_cat_declare_add_rec;
1604 rc = class_register_type(&mdd_obd_device_ops, NULL, true, NULL,
1605 LUSTRE_MDD_NAME, &mdd_device_type);
1607 lu_kmem_fini(mdd_caches);
1611 static void __exit mdd_mod_exit(void)
1613 class_unregister_type(LUSTRE_MDD_NAME);
1614 lu_kmem_fini(mdd_caches);
1617 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1618 MODULE_DESCRIPTION("Lustre Meta-data Device Prototype ("LUSTRE_MDD_NAME")");
1619 MODULE_VERSION(LUSTRE_VERSION_STRING);
1620 MODULE_LICENSE("GPL");
1622 module_init(mdd_mod_init);
1623 module_exit(mdd_mod_exit);