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, 2013, 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 <obd_class.h>
47 #include <lustre_ioctl.h>
48 #include <lustre_mds.h>
49 #include <obd_support.h>
50 #include <lu_object.h>
51 #include <lustre_param.h>
52 #include <lustre_fid.h>
54 #include "mdd_internal.h"
56 static const struct md_device_operations mdd_ops;
57 static struct lu_device_type mdd_device_type;
59 static const char mdd_root_dir_name[] = "ROOT";
60 static const char mdd_obf_dir_name[] = "fid";
61 static const char mdd_lpf_dir_name[] = "lost+found";
63 /* Slab for MDD object allocation */
64 struct kmem_cache *mdd_object_kmem;
66 static struct lu_kmem_descr mdd_caches[] = {
68 .ckd_cache = &mdd_object_kmem,
69 .ckd_name = "mdd_obj",
70 .ckd_size = sizeof(struct mdd_object)
77 static int mdd_connect_to_next(const struct lu_env *env, struct mdd_device *m,
80 struct obd_connect_data *data = NULL;
81 struct lu_device *lud = mdd2lu_dev(m);
82 struct obd_device *obd;
86 LASSERT(m->mdd_child_exp == NULL);
88 OBD_ALLOC(data, sizeof(*data));
90 GOTO(out, rc = -ENOMEM);
92 obd = class_name2obd(nextdev);
94 CERROR("can't locate next device: %s\n", nextdev);
95 GOTO(out, rc = -ENOTCONN);
98 data->ocd_connect_flags = OBD_CONNECT_VERSION;
99 data->ocd_version = LUSTRE_VERSION_CODE;
101 rc = obd_connect(NULL, &m->mdd_child_exp, obd, &obd->obd_uuid, data, NULL);
103 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
107 lud->ld_site = m->mdd_child_exp->exp_obd->obd_lu_dev->ld_site;
108 LASSERT(lud->ld_site);
109 m->mdd_child = lu2dt_dev(m->mdd_child_exp->exp_obd->obd_lu_dev);
110 m->mdd_bottom = lu2dt_dev(lud->ld_site->ls_bottom_dev);
111 lu_dev_add_linkage(lud->ld_site, lud);
115 OBD_FREE(data, sizeof(*data));
119 static int mdd_init0(const struct lu_env *env, struct mdd_device *mdd,
120 struct lu_device_type *t, struct lustre_cfg *lcfg)
125 mdd->mdd_md_dev.md_lu_dev.ld_ops = &mdd_lu_ops;
126 mdd->mdd_md_dev.md_ops = &mdd_ops;
128 rc = mdd_connect_to_next(env, mdd, lustre_cfg_string(lcfg, 3));
132 mdd->mdd_atime_diff = MAX_ATIME_DIFF;
133 /* sync permission changes */
134 mdd->mdd_sync_permission = 1;
136 dt_conf_get(env, mdd->mdd_child, &mdd->mdd_dt_conf);
138 /* we are using service name but not mdd obd name
139 * for compatibility reasons.
140 * It is passed from MDT in lustre_cfg[2] buffer */
141 rc = mdd_procfs_init(mdd, lustre_cfg_string(lcfg, 2));
143 obd_disconnect(mdd->mdd_child_exp);
148 static struct lu_device *mdd_device_fini(const struct lu_env *env,
151 struct mdd_device *mdd = lu2mdd_dev(d);
154 lu_dev_del_linkage(d->ld_site, d);
156 mdd_procfs_fini(mdd);
160 static int changelog_init_cb(const struct lu_env *env, struct llog_handle *llh,
161 struct llog_rec_hdr *hdr, void *data)
163 struct mdd_device *mdd = (struct mdd_device *)data;
164 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
166 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
167 LASSERT(rec->cr_hdr.lrh_type == CHANGELOG_REC);
170 "seeing record at index %d/%d/"LPU64" t=%x %.*s in log"
171 DOSTID"\n", hdr->lrh_index, rec->cr_hdr.lrh_index,
172 rec->cr.cr_index, rec->cr.cr_type, rec->cr.cr_namelen,
173 changelog_rec_name(&rec->cr), POSTID(&llh->lgh_id.lgl_oi));
175 mdd->mdd_cl.mc_index = rec->cr.cr_index;
176 return LLOG_PROC_BREAK;
179 static int changelog_user_init_cb(const struct lu_env *env,
180 struct llog_handle *llh,
181 struct llog_rec_hdr *hdr, void *data)
183 struct mdd_device *mdd = (struct mdd_device *)data;
184 struct llog_changelog_user_rec *rec =
185 (struct llog_changelog_user_rec *)hdr;
187 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
188 LASSERT(rec->cur_hdr.lrh_type == CHANGELOG_USER_REC);
190 CDEBUG(D_INFO, "seeing user at index %d/%d id=%d endrec="LPU64
191 " in log "DOSTID"\n", hdr->lrh_index, rec->cur_hdr.lrh_index,
192 rec->cur_id, rec->cur_endrec, POSTID(&llh->lgh_id.lgl_oi));
194 spin_lock(&mdd->mdd_cl.mc_user_lock);
195 mdd->mdd_cl.mc_lastuser = rec->cur_id;
196 if (rec->cur_endrec > mdd->mdd_cl.mc_index)
197 mdd->mdd_cl.mc_index = rec->cur_endrec;
198 spin_unlock(&mdd->mdd_cl.mc_user_lock);
200 return LLOG_PROC_BREAK;
203 static int llog_changelog_cancel_cb(const struct lu_env *env,
204 struct llog_handle *llh,
205 struct llog_rec_hdr *hdr, void *data)
207 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
208 struct llog_cookie cookie;
209 long long endrec = *(long long *)data;
214 /* This is always a (sub)log, not the catalog */
215 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
217 if (rec->cr.cr_index > endrec)
218 /* records are in order, so we're done */
219 RETURN(LLOG_PROC_BREAK);
221 cookie.lgc_lgl = llh->lgh_id;
222 cookie.lgc_index = hdr->lrh_index;
224 /* cancel them one at a time. I suppose we could store up the cookies
225 * and cancel them all at once; probably more efficient, but this is
226 * done as a user call, so who cares... */
227 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle, 1,
229 RETURN(rc < 0 ? rc : 0);
232 static int llog_changelog_cancel(const struct lu_env *env,
233 struct llog_ctxt *ctxt,
234 struct llog_cookie *cookies, int flags)
236 struct llog_handle *cathandle = ctxt->loc_handle;
241 /* This should only be called with the catalog handle */
242 LASSERT(cathandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
244 rc = llog_cat_process(env, cathandle, llog_changelog_cancel_cb,
245 (void *)cookies, 0, 0);
247 /* 0 or 1 means we're done */
250 CERROR("%s: cancel idx %u of catalog "DOSTID" rc=%d\n",
251 ctxt->loc_obd->obd_name, cathandle->lgh_last_idx,
252 POSTID(&cathandle->lgh_id.lgl_oi), rc);
257 static struct llog_operations changelog_orig_logops;
260 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on);
262 static int mdd_changelog_llog_init(const struct lu_env *env,
263 struct mdd_device *mdd)
265 struct obd_device *obd = mdd2obd_dev(mdd);
266 struct llog_ctxt *ctxt = NULL, *uctxt = NULL;
271 /* LU-2844 mdd setup failure should not cause umount oops */
272 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CHANGELOG_INIT))
275 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
276 obd->obd_lvfs_ctxt.dt = mdd->mdd_bottom;
277 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_ORIG_CTXT,
278 obd, &changelog_orig_logops);
280 CERROR("%s: changelog llog setup failed: rc = %d\n",
285 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
288 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
291 GOTO(out_cleanup, rc);
293 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
297 rc = llog_cat_reverse_process(env, ctxt->loc_handle,
298 changelog_init_cb, mdd);
301 CERROR("%s: changelog init failed: rc = %d\n", obd->obd_name,
306 CDEBUG(D_IOCTL, "changelog starting index="LPU64"\n",
307 mdd->mdd_cl.mc_index);
309 /* setup user changelog */
310 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_USER_ORIG_CTXT,
311 obd, &changelog_orig_logops);
313 CERROR("%s: changelog users llog setup failed: rc = %d\n",
318 uctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
321 rc = llog_open_create(env, uctxt, &uctxt->loc_handle, NULL,
324 GOTO(out_ucleanup, rc);
326 uctxt->loc_handle->lgh_logops->lop_add = llog_cat_add_rec;
327 uctxt->loc_handle->lgh_logops->lop_declare_add = llog_cat_declare_add_rec;
329 rc = llog_cat_init_and_process(env, uctxt->loc_handle);
331 GOTO(out_uclose, rc);
333 rc = llog_cat_reverse_process(env, uctxt->loc_handle,
334 changelog_user_init_cb, mdd);
336 CERROR("%s: changelog user init failed: rc = %d\n",
338 GOTO(out_uclose, rc);
341 /* If we have registered users, assume we want changelogs on */
342 if (mdd->mdd_cl.mc_lastuser > 0) {
343 rc = mdd_changelog_on(env, mdd, 1);
345 GOTO(out_uclose, rc);
348 llog_ctxt_put(uctxt);
351 llog_cat_close(env, uctxt->loc_handle);
353 llog_cleanup(env, uctxt);
355 llog_cat_close(env, ctxt->loc_handle);
357 llog_cleanup(env, ctxt);
361 static int mdd_changelog_init(const struct lu_env *env, struct mdd_device *mdd)
363 struct obd_device *obd = mdd2obd_dev(mdd);
366 mdd->mdd_cl.mc_index = 0;
367 spin_lock_init(&mdd->mdd_cl.mc_lock);
368 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
369 mdd->mdd_cl.mc_flags = 0; /* off by default */
370 mdd->mdd_cl.mc_mask = CHANGELOG_DEFMASK;
371 spin_lock_init(&mdd->mdd_cl.mc_user_lock);
372 mdd->mdd_cl.mc_lastuser = 0;
374 rc = mdd_changelog_llog_init(env, mdd);
376 CERROR("%s: changelog setup during init failed: rc = %d\n",
378 mdd->mdd_cl.mc_flags |= CLM_ERR;
384 static void mdd_changelog_fini(const struct lu_env *env,
385 struct mdd_device *mdd)
387 struct obd_device *obd = mdd2obd_dev(mdd);
388 struct llog_ctxt *ctxt;
390 mdd->mdd_cl.mc_flags = 0;
392 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
394 llog_cat_close(env, ctxt->loc_handle);
395 llog_cleanup(env, ctxt);
397 ctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
399 llog_cat_close(env, ctxt->loc_handle);
400 llog_cleanup(env, ctxt);
405 mdd_changelog_write_header(const struct lu_env *env, struct mdd_device *mdd,
408 /* Start / stop recording */
410 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on)
414 if ((on == 1) && ((mdd->mdd_cl.mc_flags & CLM_ON) == 0)) {
415 LCONSOLE_INFO("%s: changelog on\n", mdd2obd_dev(mdd)->obd_name);
416 if (mdd->mdd_cl.mc_flags & CLM_ERR) {
417 CERROR("Changelogs cannot be enabled due to error "
418 "condition (see %s log).\n",
419 mdd2obd_dev(mdd)->obd_name);
422 spin_lock(&mdd->mdd_cl.mc_lock);
423 mdd->mdd_cl.mc_flags |= CLM_ON;
424 spin_unlock(&mdd->mdd_cl.mc_lock);
425 rc = mdd_changelog_write_header(env, mdd, CLM_START);
427 } else if ((on == 0) && ((mdd->mdd_cl.mc_flags & CLM_ON) == CLM_ON)) {
428 LCONSOLE_INFO("%s: changelog off\n",mdd2obd_dev(mdd)->obd_name);
429 rc = mdd_changelog_write_header(env, mdd, CLM_FINI);
430 spin_lock(&mdd->mdd_cl.mc_lock);
431 mdd->mdd_cl.mc_flags &= ~CLM_ON;
432 spin_unlock(&mdd->mdd_cl.mc_lock);
437 /** Remove entries with indicies up to and including \a endrec from the
444 mdd_changelog_llog_cancel(const struct lu_env *env, struct mdd_device *mdd,
447 struct obd_device *obd = mdd2obd_dev(mdd);
448 struct llog_ctxt *ctxt;
449 long long unsigned cur;
452 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
456 spin_lock(&mdd->mdd_cl.mc_lock);
457 cur = (long long)mdd->mdd_cl.mc_index;
458 spin_unlock(&mdd->mdd_cl.mc_lock);
462 /* purge to "0" is shorthand for everything */
466 /* If purging all records, write a header entry so we don't have an
467 empty catalog and we're sure to have a valid starting index next
468 time. In case of crash, we just restart with old log so we're
471 /* XXX: transaction is started by llog itself */
472 rc = mdd_changelog_write_header(env, mdd, CLM_PURGE);
477 /* Some records were purged, so reset repeat-access time (so we
478 record new mtime update records, so users can see a file has been
479 changed since the last purge) */
480 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
482 rc = llog_cancel(env, ctxt, (struct llog_cookie *)&endrec, 0);
488 /** Add a CL_MARK record to the changelog
490 * \param markerflags - CLM_*
493 int mdd_changelog_write_header(const struct lu_env *env,
494 struct mdd_device *mdd, int markerflags)
496 struct obd_device *obd = mdd2obd_dev(mdd);
497 struct llog_changelog_rec *rec;
499 struct llog_ctxt *ctxt;
501 int len = strlen(obd->obd_name);
506 if (mdd->mdd_cl.mc_mask & (1 << CL_MARK)) {
507 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
511 reclen = llog_data_len(sizeof(*rec) + len);
512 buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
513 if (buf->lb_buf == NULL)
517 rec->cr.cr_flags = CLF_VERSION;
518 rec->cr.cr_type = CL_MARK;
519 rec->cr.cr_namelen = len;
520 memcpy(changelog_rec_name(&rec->cr), obd->obd_name, rec->cr.cr_namelen);
521 /* Status and action flags */
522 rec->cr.cr_markerflags = mdd->mdd_cl.mc_flags | markerflags;
523 rec->cr_hdr.lrh_len = llog_data_len(changelog_rec_size(&rec->cr) +
525 rec->cr_hdr.lrh_type = CHANGELOG_REC;
526 rec->cr.cr_time = cl_time();
527 spin_lock(&mdd->mdd_cl.mc_lock);
528 rec->cr.cr_index = ++mdd->mdd_cl.mc_index;
529 spin_unlock(&mdd->mdd_cl.mc_lock);
531 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
534 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cr_hdr, NULL);
539 /* assume on or off event; reset repeat-access time */
540 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
545 * Lookup method for "fid" object. Only filenames with correct SEQ:OID format
546 * are valid. We also check if object with passed fid exists or not.
548 static int obf_lookup(const struct lu_env *env, struct md_object *p,
549 const struct lu_name *lname, struct lu_fid *f,
550 struct md_op_spec *spec)
552 char *name = (char *)lname->ln_name;
553 struct mdd_device *mdd = mdo2mdd(p);
554 struct mdd_object *child;
560 sscanf(name, SFID, RFID(f));
561 if (!fid_is_sane(f)) {
562 CWARN("%s: Trying to lookup invalid FID [%s] in %s/%s, FID "
563 "format should be "DFID"\n", mdd2obd_dev(mdd)->obd_name,
564 lname->ln_name, dot_lustre_name, mdd_obf_dir_name,
565 (__u64)FID_SEQ_NORMAL, 1, 0);
566 GOTO(out, rc = -EINVAL);
569 if (!fid_is_norm(f) && !fid_is_igif(f) && !fid_is_root(f) &&
570 !fid_seq_is_dot(f->f_seq)) {
571 CWARN("%s: Trying to lookup invalid FID "DFID" in %s/%s, "
572 "sequence should be >= "LPX64" or within ["LPX64","
573 ""LPX64"].\n", mdd2obd_dev(mdd)->obd_name, PFID(f),
574 dot_lustre_name, mdd_obf_dir_name, (__u64)FID_SEQ_NORMAL,
575 (__u64)FID_SEQ_IGIF, (__u64)FID_SEQ_IGIF_MAX);
576 GOTO(out, rc = -EINVAL);
579 /* Check if object with this fid exists */
580 child = mdd_object_find(env, mdd, f);
582 GOTO(out, rc = PTR_ERR(child));
584 if (mdd_object_exists(child) == 0)
587 mdd_object_put(env, child);
593 static int mdd_dummy_create(const struct lu_env *env,
594 struct md_object *pobj,
595 const struct lu_name *lname,
596 struct md_object *child,
597 struct md_op_spec *spec,
603 static int mdd_dummy_rename(const struct lu_env *env,
604 struct md_object *src_pobj,
605 struct md_object *tgt_pobj,
606 const struct lu_fid *lf,
607 const struct lu_name *lsname,
608 struct md_object *tobj,
609 const struct lu_name *ltname,
615 static int mdd_dummy_link(const struct lu_env *env,
616 struct md_object *tgt_obj,
617 struct md_object *src_obj,
618 const struct lu_name *lname,
624 static int mdd_dummy_unlink(const struct lu_env *env,
625 struct md_object *pobj,
626 struct md_object *cobj,
627 const struct lu_name *lname,
634 static struct md_dir_operations mdd_obf_dir_ops = {
635 .mdo_lookup = obf_lookup,
636 .mdo_create = mdd_dummy_create,
637 .mdo_rename = mdd_dummy_rename,
638 .mdo_link = mdd_dummy_link,
639 .mdo_unlink = mdd_dummy_unlink
642 static struct md_dir_operations mdd_lpf_dir_ops = {
643 .mdo_lookup = mdd_lookup,
644 .mdo_create = mdd_dummy_create,
645 .mdo_rename = mdd_dummy_rename,
646 .mdo_link = mdd_dummy_link,
647 .mdo_unlink = mdd_dummy_unlink
650 static struct md_object *mdo_locate(const struct lu_env *env,
651 struct md_device *md,
652 const struct lu_fid *fid)
654 struct lu_object *obj;
655 struct md_object *mdo;
657 obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
659 obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
660 LASSERT(obj != NULL);
663 mdo = ERR_PTR(PTR_ERR(obj));
668 static int mdd_lpf_setup(const struct lu_env *env, struct mdd_device *m)
670 struct md_object *mdo;
671 struct mdd_object *mdd_lpf;
672 struct lu_fid fid = LU_LPF_FID;
676 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
677 mdd_lpf_dir_name, S_IFDIR | S_IRUSR | S_IXUSR,
682 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
684 RETURN(PTR_ERR(mdo));
686 LASSERT(lu_object_exists(&mdo->mo_lu));
688 mdd_lpf = md2mdd_obj(mdo);
689 mdd_lpf->mod_obj.mo_dir_ops = &mdd_lpf_dir_ops;
690 m->mdd_dot_lustre_objs.mdd_lpf = mdd_lpf;
696 * Create special in-memory "fid" object for open-by-fid.
698 static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
700 struct md_object *mdo;
701 struct mdd_object *mdd_obf;
702 struct lu_fid fid = LU_OBF_FID;
705 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
706 mdd_obf_dir_name, S_IFDIR | S_IXUSR, &fid);
710 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
712 RETURN(PTR_ERR(mdo));
714 LASSERT(lu_object_exists(&mdo->mo_lu));
716 mdd_obf = md2mdd_obj(mdo);
717 mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
718 m->mdd_dot_lustre_objs.mdd_obf = mdd_obf;
723 static void mdd_dot_lustre_cleanup(const struct lu_env *env,
724 struct mdd_device *m)
726 if (m->mdd_dot_lustre_objs.mdd_lpf != NULL) {
727 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_lpf);
728 m->mdd_dot_lustre_objs.mdd_lpf = NULL;
730 if (m->mdd_dot_lustre_objs.mdd_obf != NULL) {
731 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
732 m->mdd_dot_lustre_objs.mdd_obf = NULL;
734 if (m->mdd_dot_lustre != NULL) {
735 mdd_object_put(env, m->mdd_dot_lustre);
736 m->mdd_dot_lustre = NULL;
740 /** Setup ".lustre" directory object */
741 static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
743 struct md_object *mdo;
748 /* Create ".lustre" directory in ROOT. */
749 fid = LU_DOT_LUSTRE_FID;
750 rc = mdd_local_file_create(env, m, &m->mdd_root_fid,
752 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO,
756 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
758 RETURN(PTR_ERR(mdo));
759 LASSERT(lu_object_exists(&mdo->mo_lu));
761 m->mdd_dot_lustre = md2mdd_obj(mdo);
763 rc = mdd_obf_setup(env, m);
765 CERROR("%s: error initializing \"fid\" object: rc = %d.\n",
766 mdd2obd_dev(m)->obd_name, rc);
770 rc = mdd_lpf_setup(env, m);
772 CERROR("%s: error initializing \"lost+found\": rc = %d.\n",
773 mdd2obd_dev(m)->obd_name, rc);
780 mdd_dot_lustre_cleanup(env, m);
786 static struct llog_operations hsm_actions_logops;
789 * set llog methods and create LLOG_AGENT_ORIG_CTXT llog
790 * object in obd_device
792 static int mdd_hsm_actions_llog_init(const struct lu_env *env,
793 struct mdd_device *m)
795 struct obd_device *obd = mdd2obd_dev(m);
796 struct llog_ctxt *ctxt = NULL;
800 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
801 obd->obd_lvfs_ctxt.dt = m->mdd_bottom;
803 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_AGENT_ORIG_CTXT,
804 obd, &hsm_actions_logops);
806 CERROR("%s: hsm actions llog setup failed: rc = %d\n",
811 ctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
814 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
817 CERROR("%s: hsm actions llog open_create failed: rc = %d\n",
819 GOTO(out_cleanup, rc);
822 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
830 llog_cat_close(env, ctxt->loc_handle);
831 ctxt->loc_handle = NULL;
833 llog_cleanup(env, ctxt);
839 * cleanup the context created by llog_setup_named()
841 static int mdd_hsm_actions_llog_fini(const struct lu_env *env,
842 struct mdd_device *m)
844 struct obd_device *obd = mdd2obd_dev(m);
845 struct llog_ctxt *lctxt;
848 lctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
850 llog_cat_close(env, lctxt->loc_handle);
851 lctxt->loc_handle = NULL;
852 llog_cleanup(env, lctxt);
858 static void mdd_device_shutdown(const struct lu_env *env, struct mdd_device *m,
859 struct lustre_cfg *cfg)
861 mdd_generic_thread_stop(&m->mdd_orph_cleanup_thread);
862 lfsck_degister(env, m->mdd_bottom);
863 mdd_hsm_actions_llog_fini(env, m);
864 mdd_changelog_fini(env, m);
865 orph_index_fini(env, m);
866 mdd_dot_lustre_cleanup(env, m);
867 if (m->mdd_los != NULL) {
868 local_oid_storage_fini(env, m->mdd_los);
871 lu_site_purge(env, mdd2lu_dev(m)->ld_site, ~0);
873 if (m->mdd_child_exp)
874 obd_disconnect(m->mdd_child_exp);
877 static int mdd_process_config(const struct lu_env *env,
878 struct lu_device *d, struct lustre_cfg *cfg)
880 struct mdd_device *m = lu2mdd_dev(d);
881 struct dt_device *dt = m->mdd_child;
882 struct lu_device *next = &dt->dd_lu_dev;
886 switch (cfg->lcfg_command) {
888 struct obd_device *obd = mdd2obd_dev(m);
890 rc = class_process_proc_param(PARAM_MDD, obd->obd_vars, cfg, m);
891 if (rc > 0 || rc == -ENOSYS)
892 /* we don't understand; pass it on */
893 rc = next->ld_ops->ldo_process_config(env, next, cfg);
897 rc = next->ld_ops->ldo_process_config(env, next, cfg);
900 dt_conf_get(env, dt, &m->mdd_dt_conf);
903 rc = next->ld_ops->ldo_process_config(env, next, cfg);
904 lu_dev_del_linkage(d->ld_site, d);
905 mdd_device_shutdown(env, m, cfg);
908 rc = next->ld_ops->ldo_process_config(env, next, cfg);
915 static int mdd_recovery_complete(const struct lu_env *env,
918 struct mdd_device *mdd = lu2mdd_dev(d);
919 struct lu_device *next;
923 LASSERT(mdd != NULL);
924 next = &mdd->mdd_child->dd_lu_dev;
926 /* XXX: orphans handling. */
927 mdd_orphan_cleanup(env, mdd);
928 rc = next->ld_ops->ldo_recovery_complete(env, next);
933 int mdd_local_file_create(const struct lu_env *env, struct mdd_device *mdd,
934 const struct lu_fid *pfid, const char *name, __u32 mode,
937 struct dt_object *parent, *dto;
942 LASSERT(!fid_is_zero(pfid));
943 parent = dt_locate(env, mdd->mdd_bottom, pfid);
944 if (unlikely(IS_ERR(parent)))
945 RETURN(PTR_ERR(parent));
947 /* create local file/dir, if @fid is passed then try to use it */
948 if (fid_is_zero(fid))
949 dto = local_file_find_or_create(env, mdd->mdd_los, parent,
952 dto = local_file_find_or_create_with_fid(env, mdd->mdd_bottom,
956 GOTO(out_put, rc = PTR_ERR(dto));
957 *fid = *lu_object_fid(&dto->do_lu);
958 /* since stack is not fully set up the local_storage uses own stack
959 * and we should drop its object from cache */
960 lu_object_put_nocache(env, &dto->do_lu);
963 lu_object_put(env, &parent->do_lu);
967 static int mdd_lfsck_out_notify(const struct lu_env *env, void *data,
968 enum lfsck_events event)
973 static int mdd_prepare(const struct lu_env *env,
974 struct lu_device *pdev,
975 struct lu_device *cdev)
977 struct mdd_device *mdd = lu2mdd_dev(cdev);
978 struct lu_device *next = &mdd->mdd_child->dd_lu_dev;
984 rc = next->ld_ops->ldo_prepare(env, cdev, next);
988 /* Setup local dirs */
989 fid.f_seq = FID_SEQ_LOCAL_NAME;
992 rc = local_oid_storage_init(env, mdd->mdd_bottom, &fid,
997 rc = dt_root_get(env, mdd->mdd_child, &mdd->mdd_local_root_fid);
1002 if (mdd_seq_site(mdd)->ss_node_id == 0) {
1003 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
1004 mdd_root_dir_name, S_IFDIR |
1005 S_IRUGO | S_IWUSR | S_IXUGO, &fid);
1007 CERROR("%s: create root fid failed: rc = %d\n",
1008 mdd2obd_dev(mdd)->obd_name, rc);
1012 mdd->mdd_root_fid = fid;
1013 rc = mdd_dot_lustre_setup(env, mdd);
1015 CERROR("%s: initializing .lustre failed: rc = %d\n",
1016 mdd2obd_dev(mdd)->obd_name, rc);
1020 rc = mdd_compat_fixes(env, mdd);
1024 /* Normal client usually send root access to MDT0 directly,
1025 * the root FID on non-MDT0 will only be used by echo client. */
1026 mdd->mdd_root_fid = fid;
1029 rc = orph_index_init(env, mdd);
1033 rc = mdd_changelog_init(env, mdd);
1035 CERROR("%s: failed to initialize changelog: rc = %d\n",
1036 mdd2obd_dev(mdd)->obd_name, rc);
1040 rc = mdd_hsm_actions_llog_init(env, mdd);
1042 GOTO(out_changelog, rc);
1044 rc = lfsck_register(env, mdd->mdd_bottom, mdd->mdd_child,
1045 mdd2obd_dev(mdd), mdd_lfsck_out_notify,
1048 CERROR("%s: failed to initialize lfsck: rc = %d\n",
1049 mdd2obd_dev(mdd)->obd_name, rc);
1054 mdd_hsm_actions_llog_fini(env, mdd);
1056 mdd_changelog_fini(env, mdd);
1058 orph_index_fini(env, mdd);
1060 if (mdd_seq_site(mdd)->ss_node_id == 0)
1061 mdd_dot_lustre_cleanup(env, mdd);
1063 local_oid_storage_fini(env, mdd->mdd_los);
1064 mdd->mdd_los = NULL;
1069 const struct lu_device_operations mdd_lu_ops = {
1070 .ldo_object_alloc = mdd_object_alloc,
1071 .ldo_process_config = mdd_process_config,
1072 .ldo_recovery_complete = mdd_recovery_complete,
1073 .ldo_prepare = mdd_prepare,
1076 static int mdd_root_get(const struct lu_env *env,
1077 struct md_device *m, struct lu_fid *f)
1079 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1082 *f = mdd->mdd_root_fid;
1087 * No permission check is needed.
1089 static int mdd_statfs(const struct lu_env *env, struct md_device *m,
1090 struct obd_statfs *sfs)
1092 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1097 rc = mdd_child_ops(mdd)->dt_statfs(env, mdd->mdd_child, sfs);
1099 sfs->os_namelen = min_t(__u32, sfs->os_namelen, NAME_MAX);
1105 * No permission check is needed.
1107 static int mdd_init_capa_ctxt(const struct lu_env *env, struct md_device *m,
1108 int mode, unsigned long timeout, __u32 alg,
1109 struct lustre_capa_key *keys)
1111 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1115 /* need barrier for mds_capa_keys access. */
1117 rc = mdd_child_ops(mdd)->dt_init_capa_ctxt(env, mdd->mdd_child, mode,
1118 timeout, alg, keys);
1122 static int mdd_maxeasize_get(const struct lu_env *env, struct md_device *m,
1125 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1128 *easize = mdd->mdd_dt_conf.ddp_max_ea_size;
1133 static int mdd_update_capa_key(const struct lu_env *env,
1134 struct md_device *m,
1135 struct lustre_capa_key *key)
1137 /* we do not support capabilities ... */
1141 static int mdd_llog_ctxt_get(const struct lu_env *env, struct md_device *m,
1144 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1146 *h = llog_group_get_ctxt(&mdd2obd_dev(mdd)->obd_olg, idx);
1147 return (*h == NULL ? -ENOENT : 0);
1150 static struct lu_device *mdd_device_free(const struct lu_env *env,
1151 struct lu_device *lu)
1153 struct mdd_device *m = lu2mdd_dev(lu);
1156 LASSERT(atomic_read(&lu->ld_ref) == 0);
1157 md_device_fini(&m->mdd_md_dev);
1162 static struct lu_device *mdd_device_alloc(const struct lu_env *env,
1163 struct lu_device_type *t,
1164 struct lustre_cfg *lcfg)
1166 struct lu_device *l;
1167 struct mdd_device *m;
1171 l = ERR_PTR(-ENOMEM);
1176 md_device_init(&m->mdd_md_dev, t);
1177 rc = mdd_init0(env, m, t, lcfg);
1179 mdd_device_free(env, l);
1188 * we use exports to track all mdd users
1190 static int mdd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1191 struct obd_device *obd, struct obd_uuid *cluuid,
1192 struct obd_connect_data *data, void *localdata)
1194 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1195 struct lustre_handle conn;
1199 CDEBUG(D_CONFIG, "connect #%d\n", mdd->mdd_connects);
1201 rc = class_connect(&conn, obd, cluuid);
1205 *exp = class_conn2export(&conn);
1207 /* Why should there ever be more than 1 connect? */
1208 LASSERT(mdd->mdd_connects == 0);
1209 mdd->mdd_connects++;
1215 * once last export (we don't count self-export) disappeared
1216 * mdd can be released
1218 static int mdd_obd_disconnect(struct obd_export *exp)
1220 struct obd_device *obd = exp->exp_obd;
1221 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1222 int rc, release = 0;
1225 mdd->mdd_connects--;
1226 if (mdd->mdd_connects == 0)
1229 rc = class_disconnect(exp);
1231 if (rc == 0 && release)
1232 class_manual_cleanup(obd);
1236 static int mdd_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1237 __u32 keylen, void *key, __u32 *vallen, void *val,
1238 struct lov_stripe_md *lsm)
1242 if (KEY_IS(KEY_OSP_CONNECTED)) {
1243 struct obd_device *obd = exp->exp_obd;
1244 struct mdd_device *mdd;
1246 if (!obd->obd_set_up || obd->obd_stopping)
1249 mdd = lu2mdd_dev(obd->obd_lu_dev);
1251 rc = obd_get_info(env, mdd->mdd_child_exp, keylen, key, vallen,
1259 static struct obd_ops mdd_obd_device_ops = {
1260 .o_owner = THIS_MODULE,
1261 .o_connect = mdd_obd_connect,
1262 .o_disconnect = mdd_obd_disconnect,
1263 .o_get_info = mdd_obd_get_info,
1266 static int mdd_changelog_user_register(const struct lu_env *env,
1267 struct mdd_device *mdd, int *id)
1269 struct llog_ctxt *ctxt;
1270 struct llog_changelog_user_rec *rec;
1274 ctxt = llog_get_context(mdd2obd_dev(mdd),
1275 LLOG_CHANGELOG_USER_ORIG_CTXT);
1281 llog_ctxt_put(ctxt);
1285 /* Assume we want it on since somebody registered */
1286 rc = mdd_changelog_on(env, mdd, 1);
1290 rec->cur_hdr.lrh_len = sizeof(*rec);
1291 rec->cur_hdr.lrh_type = CHANGELOG_USER_REC;
1292 spin_lock(&mdd->mdd_cl.mc_user_lock);
1293 if (mdd->mdd_cl.mc_lastuser == (unsigned int)(-1)) {
1294 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1295 CERROR("Maximum number of changelog users exceeded!\n");
1296 GOTO(out, rc = -EOVERFLOW);
1298 *id = rec->cur_id = ++mdd->mdd_cl.mc_lastuser;
1299 rec->cur_endrec = mdd->mdd_cl.mc_index;
1300 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1302 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cur_hdr, NULL);
1304 CDEBUG(D_IOCTL, "Registered changelog user %d\n", *id);
1307 llog_ctxt_put(ctxt);
1311 struct mdd_changelog_user_data {
1312 __u64 mcud_endrec; /**< purge record for this user */
1313 __u64 mcud_minrec; /**< lowest changelog recno still referenced */
1315 __u32 mcud_minid; /**< user id with lowest rec reference */
1316 __u32 mcud_usercount;
1317 unsigned int mcud_found:1;
1319 #define MCUD_UNREGISTER -1LL
1322 * 1. Find the smallest record everyone is willing to purge
1323 * 2. Update the last purgeable record for this user
1325 static int mdd_changelog_user_purge_cb(const struct lu_env *env,
1326 struct llog_handle *llh,
1327 struct llog_rec_hdr *hdr, void *data)
1329 struct llog_changelog_user_rec *rec;
1330 struct mdd_changelog_user_data *mcud = data;
1335 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
1337 rec = (struct llog_changelog_user_rec *)hdr;
1339 mcud->mcud_usercount++;
1341 /* If we have a new endrec for this id, use it for the following
1342 min check instead of its old value */
1343 if (rec->cur_id == mcud->mcud_id)
1344 rec->cur_endrec = max(rec->cur_endrec, mcud->mcud_endrec);
1346 /* Track the minimum referenced record */
1347 if (mcud->mcud_minid == 0 || mcud->mcud_minrec > rec->cur_endrec) {
1348 mcud->mcud_minid = rec->cur_id;
1349 mcud->mcud_minrec = rec->cur_endrec;
1352 if (rec->cur_id != mcud->mcud_id)
1355 /* Update this user's record */
1356 mcud->mcud_found = 1;
1358 /* Special case: unregister this user */
1359 if (mcud->mcud_endrec == MCUD_UNREGISTER) {
1360 struct llog_cookie cookie;
1362 cookie.lgc_lgl = llh->lgh_id;
1363 cookie.lgc_index = hdr->lrh_index;
1365 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
1368 mcud->mcud_usercount--;
1373 /* Update the endrec */
1374 CDEBUG(D_IOCTL, "Rewriting changelog user %d endrec to "LPU64"\n",
1375 mcud->mcud_id, rec->cur_endrec);
1377 rc = llog_write(env, llh, hdr, hdr->lrh_index);
1382 static int mdd_changelog_user_purge(const struct lu_env *env,
1383 struct mdd_device *mdd, int id,
1386 struct mdd_changelog_user_data data;
1387 struct llog_ctxt *ctxt;
1391 CDEBUG(D_IOCTL, "Purge request: id=%d, endrec=%lld\n", id, endrec);
1394 data.mcud_minid = 0;
1395 data.mcud_minrec = 0;
1396 data.mcud_usercount = 0;
1397 data.mcud_endrec = endrec;
1398 spin_lock(&mdd->mdd_cl.mc_lock);
1399 endrec = mdd->mdd_cl.mc_index;
1400 spin_unlock(&mdd->mdd_cl.mc_lock);
1401 if ((data.mcud_endrec == 0) ||
1402 ((data.mcud_endrec > endrec) &&
1403 (data.mcud_endrec != MCUD_UNREGISTER)))
1404 data.mcud_endrec = endrec;
1406 ctxt = llog_get_context(mdd2obd_dev(mdd),
1407 LLOG_CHANGELOG_USER_ORIG_CTXT);
1411 LASSERT(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
1413 rc = llog_cat_process(env, ctxt->loc_handle,
1414 mdd_changelog_user_purge_cb, (void *)&data,
1416 if ((rc >= 0) && (data.mcud_minrec > 0)) {
1417 CDEBUG(D_IOCTL, "Purging changelog entries up to "LPD64
1418 ", referenced by "CHANGELOG_USER_PREFIX"%d\n",
1419 data.mcud_minrec, data.mcud_minid);
1420 rc = mdd_changelog_llog_cancel(env, mdd, data.mcud_minrec);
1422 CWARN("Could not determine changelog records to purge; rc=%d\n",
1426 llog_ctxt_put(ctxt);
1428 if (!data.mcud_found) {
1429 CWARN("No entry for user %d. Last changelog reference is "
1430 LPD64" by changelog user %d\n", data.mcud_id,
1431 data.mcud_minrec, data.mcud_minid);
1435 if (!rc && data.mcud_usercount == 0)
1436 /* No more users; turn changelogs off */
1437 rc = mdd_changelog_on(env, mdd, 0);
1443 * May be called remotely from mdt_iocontrol_handle or locally from
1444 * mdt_iocontrol. Data may be freeform - remote handling doesn't enforce
1445 * an obd_ioctl_data format (but local ioctl handler does).
1447 * \param len - data len
1448 * \param karg - ioctl data, in kernel space
1450 static int mdd_iocontrol(const struct lu_env *env, struct md_device *m,
1451 unsigned int cmd, int len, void *karg)
1453 struct mdd_device *mdd;
1454 struct obd_ioctl_data *data = karg;
1458 mdd = lu2mdd_dev(&m->md_lu_dev);
1460 /* Doesn't use obd_ioctl_data */
1462 case OBD_IOC_CHANGELOG_CLEAR: {
1463 struct changelog_setinfo *cs = karg;
1464 rc = mdd_changelog_user_purge(env, mdd, cs->cs_id,
1468 case OBD_IOC_GET_MNTOPT: {
1469 mntopt_t *mntopts = (mntopt_t *)karg;
1470 *mntopts = mdd->mdd_dt_conf.ddp_mntopts;
1473 case OBD_IOC_START_LFSCK: {
1474 rc = lfsck_start(env, mdd->mdd_bottom,
1475 (struct lfsck_start_param *)karg);
1478 case OBD_IOC_STOP_LFSCK: {
1479 rc = lfsck_stop(env, mdd->mdd_bottom,
1480 (struct lfsck_stop *)karg);
1485 /* Below ioctls use obd_ioctl_data */
1486 if (len != sizeof(*data)) {
1487 CERROR("Bad ioctl size %d\n", len);
1490 if (data->ioc_version != OBD_IOCTL_VERSION) {
1491 CERROR("Bad magic %x != %x\n", data->ioc_version,
1497 case OBD_IOC_CHANGELOG_REG:
1498 rc = mdd_changelog_user_register(env, mdd, &data->ioc_u32_1);
1500 case OBD_IOC_CHANGELOG_DEREG:
1501 rc = mdd_changelog_user_purge(env, mdd, data->ioc_u32_1,
1511 /* type constructor/destructor: mdd_type_init, mdd_type_fini */
1512 LU_TYPE_INIT_FINI(mdd, &mdd_thread_key);
1514 static const struct md_device_operations mdd_ops = {
1515 .mdo_statfs = mdd_statfs,
1516 .mdo_root_get = mdd_root_get,
1517 .mdo_init_capa_ctxt = mdd_init_capa_ctxt,
1518 .mdo_update_capa_key= mdd_update_capa_key,
1519 .mdo_llog_ctxt_get = mdd_llog_ctxt_get,
1520 .mdo_iocontrol = mdd_iocontrol,
1521 .mdo_maxeasize_get = mdd_maxeasize_get,
1524 static struct lu_device_type_operations mdd_device_type_ops = {
1525 .ldto_init = mdd_type_init,
1526 .ldto_fini = mdd_type_fini,
1528 .ldto_start = mdd_type_start,
1529 .ldto_stop = mdd_type_stop,
1531 .ldto_device_alloc = mdd_device_alloc,
1532 .ldto_device_free = mdd_device_free,
1534 .ldto_device_fini = mdd_device_fini
1537 static struct lu_device_type mdd_device_type = {
1538 .ldt_tags = LU_DEVICE_MD,
1539 .ldt_name = LUSTRE_MDD_NAME,
1540 .ldt_ops = &mdd_device_type_ops,
1541 .ldt_ctx_tags = LCT_MD_THREAD
1544 /* context key constructor: mdd_key_init */
1545 LU_KEY_INIT(mdd, struct mdd_thread_info);
1547 static void mdd_key_fini(const struct lu_context *ctx,
1548 struct lu_context_key *key, void *data)
1550 struct mdd_thread_info *info = data;
1552 lu_buf_free(&info->mti_big_buf);
1553 lu_buf_free(&info->mti_link_buf);
1558 /* context key: mdd_thread_key */
1559 LU_CONTEXT_KEY_DEFINE(mdd, LCT_MD_THREAD);
1561 int mdd_generic_thread_start(struct mdd_generic_thread *thread,
1562 int (*func)(void *), void *data, char *name)
1564 struct task_struct *task;
1566 LASSERT(thread->mgt_init == false);
1567 init_completion(&thread->mgt_started);
1568 init_completion(&thread->mgt_finished);
1569 thread->mgt_data = data;
1570 thread->mgt_abort = false;
1571 thread->mgt_init = true;
1573 task = kthread_run(func, thread, name);
1575 complete(&thread->mgt_finished);
1576 return PTR_ERR(task);
1578 wait_for_completion(&thread->mgt_started);
1582 void mdd_generic_thread_stop(struct mdd_generic_thread *thread)
1584 if (thread->mgt_init == true) {
1585 thread->mgt_abort = true;
1586 wait_for_completion(&thread->mgt_finished);
1590 static int __init mdd_mod_init(void)
1594 rc = lu_kmem_init(mdd_caches);
1598 changelog_orig_logops = llog_osd_ops;
1599 changelog_orig_logops.lop_cancel = llog_changelog_cancel;
1600 changelog_orig_logops.lop_add = llog_cat_add_rec;
1601 changelog_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1603 hsm_actions_logops = llog_osd_ops;
1604 hsm_actions_logops.lop_add = llog_cat_add_rec;
1605 hsm_actions_logops.lop_declare_add = llog_cat_declare_add_rec;
1607 rc = class_register_type(&mdd_obd_device_ops, NULL, true, NULL,
1608 LUSTRE_MDD_NAME, &mdd_device_type);
1610 lu_kmem_fini(mdd_caches);
1614 static void __exit mdd_mod_exit(void)
1616 class_unregister_type(LUSTRE_MDD_NAME);
1617 lu_kmem_fini(mdd_caches);
1620 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1621 MODULE_DESCRIPTION("Lustre Meta-data Device Prototype ("LUSTRE_MDD_NAME")");
1622 MODULE_LICENSE("GPL");
1624 cfs_module(mdd, "0.1.0", mdd_mod_init, mdd_mod_exit);