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_mds.h>
48 #include <obd_support.h>
49 #include <lu_object.h>
50 #include <lustre_param.h>
51 #include <lustre_fid.h>
53 #include "mdd_internal.h"
55 static const struct md_device_operations mdd_ops;
56 static struct lu_device_type mdd_device_type;
58 static const char mdd_root_dir_name[] = "ROOT";
59 static const char mdd_obf_dir_name[] = "fid";
60 static const char mdd_lpf_dir_name[] = "lost+found";
62 /* Slab for MDD object allocation */
63 struct kmem_cache *mdd_object_kmem;
65 static struct lu_kmem_descr mdd_caches[] = {
67 .ckd_cache = &mdd_object_kmem,
68 .ckd_name = "mdd_obj",
69 .ckd_size = sizeof(struct mdd_object)
76 static int mdd_connect_to_next(const struct lu_env *env, struct mdd_device *m,
79 struct obd_connect_data *data = NULL;
80 struct lu_device *lud = mdd2lu_dev(m);
81 struct obd_device *obd;
85 LASSERT(m->mdd_child_exp == NULL);
87 OBD_ALLOC(data, sizeof(*data));
89 GOTO(out, rc = -ENOMEM);
91 obd = class_name2obd(nextdev);
93 CERROR("can't locate next device: %s\n", nextdev);
94 GOTO(out, rc = -ENOTCONN);
97 data->ocd_connect_flags = OBD_CONNECT_VERSION;
98 data->ocd_version = LUSTRE_VERSION_CODE;
100 rc = obd_connect(NULL, &m->mdd_child_exp, obd, &obd->obd_uuid, data, NULL);
102 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
106 lud->ld_site = m->mdd_child_exp->exp_obd->obd_lu_dev->ld_site;
107 LASSERT(lud->ld_site);
108 m->mdd_child = lu2dt_dev(m->mdd_child_exp->exp_obd->obd_lu_dev);
109 m->mdd_bottom = lu2dt_dev(lud->ld_site->ls_bottom_dev);
110 lu_dev_add_linkage(lud->ld_site, lud);
114 OBD_FREE(data, sizeof(*data));
118 static int mdd_init0(const struct lu_env *env, struct mdd_device *mdd,
119 struct lu_device_type *t, struct lustre_cfg *lcfg)
124 mdd->mdd_md_dev.md_lu_dev.ld_ops = &mdd_lu_ops;
125 mdd->mdd_md_dev.md_ops = &mdd_ops;
127 rc = mdd_connect_to_next(env, mdd, lustre_cfg_string(lcfg, 3));
131 mdd->mdd_atime_diff = MAX_ATIME_DIFF;
132 /* sync permission changes */
133 mdd->mdd_sync_permission = 1;
135 dt_conf_get(env, mdd->mdd_child, &mdd->mdd_dt_conf);
137 /* we are using service name but not mdd obd name
138 * for compatibility reasons.
139 * It is passed from MDT in lustre_cfg[2] buffer */
140 rc = mdd_procfs_init(mdd, lustre_cfg_string(lcfg, 2));
142 obd_disconnect(mdd->mdd_child_exp);
147 static struct lu_device *mdd_device_fini(const struct lu_env *env,
150 struct mdd_device *mdd = lu2mdd_dev(d);
154 lu_dev_del_linkage(d->ld_site, d);
156 rc = mdd_procfs_fini(mdd);
158 CERROR("proc fini error %d \n", rc);
164 static int changelog_init_cb(const struct lu_env *env, struct llog_handle *llh,
165 struct llog_rec_hdr *hdr, void *data)
167 struct mdd_device *mdd = (struct mdd_device *)data;
168 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
170 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
171 LASSERT(rec->cr_hdr.lrh_type == CHANGELOG_REC);
174 "seeing record at index %d/%d/"LPU64" t=%x %.*s in log"
175 DOSTID"\n", hdr->lrh_index, rec->cr_hdr.lrh_index,
176 rec->cr.cr_index, rec->cr.cr_type, rec->cr.cr_namelen,
177 rec->cr.cr_name, POSTID(&llh->lgh_id.lgl_oi));
179 mdd->mdd_cl.mc_index = rec->cr.cr_index;
180 return LLOG_PROC_BREAK;
183 static int changelog_user_init_cb(const struct lu_env *env,
184 struct llog_handle *llh,
185 struct llog_rec_hdr *hdr, void *data)
187 struct mdd_device *mdd = (struct mdd_device *)data;
188 struct llog_changelog_user_rec *rec =
189 (struct llog_changelog_user_rec *)hdr;
191 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
192 LASSERT(rec->cur_hdr.lrh_type == CHANGELOG_USER_REC);
194 CDEBUG(D_INFO, "seeing user at index %d/%d id=%d endrec="LPU64
195 " in log "DOSTID"\n", hdr->lrh_index, rec->cur_hdr.lrh_index,
196 rec->cur_id, rec->cur_endrec, POSTID(&llh->lgh_id.lgl_oi));
198 spin_lock(&mdd->mdd_cl.mc_user_lock);
199 mdd->mdd_cl.mc_lastuser = rec->cur_id;
200 if (rec->cur_endrec > mdd->mdd_cl.mc_index)
201 mdd->mdd_cl.mc_index = rec->cur_endrec;
202 spin_unlock(&mdd->mdd_cl.mc_user_lock);
204 return LLOG_PROC_BREAK;
207 static int llog_changelog_cancel_cb(const struct lu_env *env,
208 struct llog_handle *llh,
209 struct llog_rec_hdr *hdr, void *data)
211 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
212 struct llog_cookie cookie;
213 long long endrec = *(long long *)data;
218 /* This is always a (sub)log, not the catalog */
219 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
221 if (rec->cr.cr_index > endrec)
222 /* records are in order, so we're done */
223 RETURN(LLOG_PROC_BREAK);
225 cookie.lgc_lgl = llh->lgh_id;
226 cookie.lgc_index = hdr->lrh_index;
228 /* cancel them one at a time. I suppose we could store up the cookies
229 * and cancel them all at once; probably more efficient, but this is
230 * done as a user call, so who cares... */
231 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle, 1,
233 RETURN(rc < 0 ? rc : 0);
236 static int llog_changelog_cancel(const struct lu_env *env,
237 struct llog_ctxt *ctxt,
238 struct llog_cookie *cookies, int flags)
240 struct llog_handle *cathandle = ctxt->loc_handle;
245 /* This should only be called with the catalog handle */
246 LASSERT(cathandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
248 rc = llog_cat_process(env, cathandle, llog_changelog_cancel_cb,
249 (void *)cookies, 0, 0);
251 /* 0 or 1 means we're done */
254 CERROR("%s: cancel idx %u of catalog "DOSTID" rc=%d\n",
255 ctxt->loc_obd->obd_name, cathandle->lgh_last_idx,
256 POSTID(&cathandle->lgh_id.lgl_oi), rc);
261 static struct llog_operations changelog_orig_logops;
264 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on);
266 static int mdd_changelog_llog_init(const struct lu_env *env,
267 struct mdd_device *mdd)
269 struct obd_device *obd = mdd2obd_dev(mdd);
270 struct llog_ctxt *ctxt = NULL, *uctxt = NULL;
275 /* LU-2844 mdd setup failure should not cause umount oops */
276 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CHANGELOG_INIT))
279 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
280 obd->obd_lvfs_ctxt.dt = mdd->mdd_bottom;
281 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_ORIG_CTXT,
282 obd, &changelog_orig_logops);
284 CERROR("%s: changelog llog setup failed: rc = %d\n",
289 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
292 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
295 GOTO(out_cleanup, rc);
297 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
301 rc = llog_cat_reverse_process(env, ctxt->loc_handle,
302 changelog_init_cb, mdd);
305 CERROR("%s: changelog init failed: rc = %d\n", obd->obd_name,
310 CDEBUG(D_IOCTL, "changelog starting index="LPU64"\n",
311 mdd->mdd_cl.mc_index);
313 /* setup user changelog */
314 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_USER_ORIG_CTXT,
315 obd, &changelog_orig_logops);
317 CERROR("%s: changelog users llog setup failed: rc = %d\n",
322 uctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
325 rc = llog_open_create(env, uctxt, &uctxt->loc_handle, NULL,
328 GOTO(out_ucleanup, rc);
330 uctxt->loc_handle->lgh_logops->lop_add = llog_cat_add_rec;
331 uctxt->loc_handle->lgh_logops->lop_declare_add = llog_cat_declare_add_rec;
333 rc = llog_cat_init_and_process(env, uctxt->loc_handle);
335 GOTO(out_uclose, rc);
337 rc = llog_cat_reverse_process(env, uctxt->loc_handle,
338 changelog_user_init_cb, mdd);
340 CERROR("%s: changelog user init failed: rc = %d\n",
342 GOTO(out_uclose, rc);
345 /* If we have registered users, assume we want changelogs on */
346 if (mdd->mdd_cl.mc_lastuser > 0) {
347 rc = mdd_changelog_on(env, mdd, 1);
349 GOTO(out_uclose, rc);
352 llog_ctxt_put(uctxt);
355 llog_cat_close(env, uctxt->loc_handle);
357 llog_cleanup(env, uctxt);
359 llog_cat_close(env, ctxt->loc_handle);
361 llog_cleanup(env, ctxt);
365 static int mdd_changelog_init(const struct lu_env *env, struct mdd_device *mdd)
367 struct obd_device *obd = mdd2obd_dev(mdd);
370 mdd->mdd_cl.mc_index = 0;
371 spin_lock_init(&mdd->mdd_cl.mc_lock);
372 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
373 mdd->mdd_cl.mc_flags = 0; /* off by default */
374 mdd->mdd_cl.mc_mask = CHANGELOG_DEFMASK;
375 spin_lock_init(&mdd->mdd_cl.mc_user_lock);
376 mdd->mdd_cl.mc_lastuser = 0;
378 rc = mdd_changelog_llog_init(env, mdd);
380 CERROR("%s: changelog setup during init failed: rc = %d\n",
382 mdd->mdd_cl.mc_flags |= CLM_ERR;
388 static void mdd_changelog_fini(const struct lu_env *env,
389 struct mdd_device *mdd)
391 struct obd_device *obd = mdd2obd_dev(mdd);
392 struct llog_ctxt *ctxt;
394 mdd->mdd_cl.mc_flags = 0;
396 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
398 llog_cat_close(env, ctxt->loc_handle);
399 llog_cleanup(env, ctxt);
401 ctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
403 llog_cat_close(env, ctxt->loc_handle);
404 llog_cleanup(env, ctxt);
409 mdd_changelog_write_header(const struct lu_env *env, struct mdd_device *mdd,
412 /* Start / stop recording */
414 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on)
418 if ((on == 1) && ((mdd->mdd_cl.mc_flags & CLM_ON) == 0)) {
419 LCONSOLE_INFO("%s: changelog on\n", mdd2obd_dev(mdd)->obd_name);
420 if (mdd->mdd_cl.mc_flags & CLM_ERR) {
421 CERROR("Changelogs cannot be enabled due to error "
422 "condition (see %s log).\n",
423 mdd2obd_dev(mdd)->obd_name);
426 spin_lock(&mdd->mdd_cl.mc_lock);
427 mdd->mdd_cl.mc_flags |= CLM_ON;
428 spin_unlock(&mdd->mdd_cl.mc_lock);
429 rc = mdd_changelog_write_header(env, mdd, CLM_START);
431 } else if ((on == 0) && ((mdd->mdd_cl.mc_flags & CLM_ON) == CLM_ON)) {
432 LCONSOLE_INFO("%s: changelog off\n",mdd2obd_dev(mdd)->obd_name);
433 rc = mdd_changelog_write_header(env, mdd, CLM_FINI);
434 spin_lock(&mdd->mdd_cl.mc_lock);
435 mdd->mdd_cl.mc_flags &= ~CLM_ON;
436 spin_unlock(&mdd->mdd_cl.mc_lock);
441 /** Remove entries with indicies up to and including \a endrec from the
448 mdd_changelog_llog_cancel(const struct lu_env *env, struct mdd_device *mdd,
451 struct obd_device *obd = mdd2obd_dev(mdd);
452 struct llog_ctxt *ctxt;
453 long long unsigned cur;
456 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
460 spin_lock(&mdd->mdd_cl.mc_lock);
461 cur = (long long)mdd->mdd_cl.mc_index;
462 spin_unlock(&mdd->mdd_cl.mc_lock);
466 /* purge to "0" is shorthand for everything */
470 /* If purging all records, write a header entry so we don't have an
471 empty catalog and we're sure to have a valid starting index next
472 time. In case of crash, we just restart with old log so we're
475 /* XXX: transaction is started by llog itself */
476 rc = mdd_changelog_write_header(env, mdd, CLM_PURGE);
481 /* Some records were purged, so reset repeat-access time (so we
482 record new mtime update records, so users can see a file has been
483 changed since the last purge) */
484 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
486 rc = llog_cancel(env, ctxt, (struct llog_cookie *)&endrec, 0);
492 /** Add a CL_MARK record to the changelog
494 * \param markerflags - CLM_*
497 int mdd_changelog_write_header(const struct lu_env *env,
498 struct mdd_device *mdd, int markerflags)
500 struct obd_device *obd = mdd2obd_dev(mdd);
501 struct llog_changelog_rec *rec;
503 struct llog_ctxt *ctxt;
505 int len = strlen(obd->obd_name);
510 if (mdd->mdd_cl.mc_mask & (1 << CL_MARK)) {
511 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
515 reclen = llog_data_len(sizeof(*rec) + len);
516 buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
517 if (buf->lb_buf == NULL)
521 rec->cr.cr_flags = CLF_VERSION;
522 rec->cr.cr_type = CL_MARK;
523 rec->cr.cr_namelen = len;
524 memcpy(rec->cr.cr_name, obd->obd_name, rec->cr.cr_namelen);
525 /* Status and action flags */
526 rec->cr.cr_markerflags = mdd->mdd_cl.mc_flags | markerflags;
527 rec->cr_hdr.lrh_len = llog_data_len(sizeof(*rec) + rec->cr.cr_namelen);
528 rec->cr_hdr.lrh_type = CHANGELOG_REC;
529 rec->cr.cr_time = cl_time();
530 spin_lock(&mdd->mdd_cl.mc_lock);
531 rec->cr.cr_index = ++mdd->mdd_cl.mc_index;
532 spin_unlock(&mdd->mdd_cl.mc_lock);
534 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
537 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cr_hdr, NULL, NULL);
542 /* assume on or off event; reset repeat-access time */
543 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
548 * Lookup method for "fid" object. Only filenames with correct SEQ:OID format
549 * are valid. We also check if object with passed fid exists or not.
551 static int obf_lookup(const struct lu_env *env, struct md_object *p,
552 const struct lu_name *lname, struct lu_fid *f,
553 struct md_op_spec *spec)
555 char *name = (char *)lname->ln_name;
556 struct mdd_device *mdd = mdo2mdd(p);
557 struct mdd_object *child;
563 sscanf(name, SFID, RFID(f));
564 if (!fid_is_sane(f)) {
565 CWARN("%s: Trying to lookup invalid FID [%s] in %s/%s, FID "
566 "format should be "DFID"\n", mdd2obd_dev(mdd)->obd_name,
567 lname->ln_name, dot_lustre_name, mdd_obf_dir_name,
568 (__u64)FID_SEQ_NORMAL, 1, 0);
569 GOTO(out, rc = -EINVAL);
572 if (!fid_is_norm(f) && !fid_is_igif(f) && !fid_is_root(f) &&
573 !fid_seq_is_dot(f->f_seq)) {
574 CWARN("%s: Trying to lookup invalid FID "DFID" in %s/%s, "
575 "sequence should be >= "LPX64" or within ["LPX64","
576 ""LPX64"].\n", mdd2obd_dev(mdd)->obd_name, PFID(f),
577 dot_lustre_name, mdd_obf_dir_name, (__u64)FID_SEQ_NORMAL,
578 (__u64)FID_SEQ_IGIF, (__u64)FID_SEQ_IGIF_MAX);
579 GOTO(out, rc = -EINVAL);
582 /* Check if object with this fid exists */
583 child = mdd_object_find(env, mdd, f);
587 GOTO(out, rc = PTR_ERR(child));
589 if (mdd_object_exists(child) == 0)
592 mdd_object_put(env, child);
598 static int mdd_dummy_create(const struct lu_env *env,
599 struct md_object *pobj,
600 const struct lu_name *lname,
601 struct md_object *child,
602 struct md_op_spec *spec,
608 static int mdd_dummy_rename(const struct lu_env *env,
609 struct md_object *src_pobj,
610 struct md_object *tgt_pobj,
611 const struct lu_fid *lf,
612 const struct lu_name *lsname,
613 struct md_object *tobj,
614 const struct lu_name *ltname,
620 static int mdd_dummy_link(const struct lu_env *env,
621 struct md_object *tgt_obj,
622 struct md_object *src_obj,
623 const struct lu_name *lname,
629 static int mdd_dummy_unlink(const struct lu_env *env,
630 struct md_object *pobj,
631 struct md_object *cobj,
632 const struct lu_name *lname,
639 static struct md_dir_operations mdd_obf_dir_ops = {
640 .mdo_lookup = obf_lookup,
641 .mdo_create = mdd_dummy_create,
642 .mdo_rename = mdd_dummy_rename,
643 .mdo_link = mdd_dummy_link,
644 .mdo_unlink = mdd_dummy_unlink
647 static struct md_dir_operations mdd_lpf_dir_ops = {
648 .mdo_lookup = mdd_lookup,
649 .mdo_create = mdd_dummy_create,
650 .mdo_rename = mdd_dummy_rename,
651 .mdo_link = mdd_dummy_link,
652 .mdo_unlink = mdd_dummy_unlink
655 static struct md_object *mdo_locate(const struct lu_env *env,
656 struct md_device *md,
657 const struct lu_fid *fid)
659 struct lu_object *obj;
660 struct md_object *mdo;
662 obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
664 obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
665 LASSERT(obj != NULL);
668 mdo = ERR_PTR(PTR_ERR(obj));
673 static int mdd_lpf_setup(const struct lu_env *env, struct mdd_device *m)
675 struct md_object *mdo;
676 struct mdd_object *mdd_lpf;
677 struct lu_fid fid = LU_LPF_FID;
681 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
682 mdd_lpf_dir_name, S_IFDIR | S_IRUSR | S_IXUSR,
687 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
689 RETURN(PTR_ERR(mdo));
691 LASSERT(lu_object_exists(&mdo->mo_lu));
693 mdd_lpf = md2mdd_obj(mdo);
694 mdd_lpf->mod_obj.mo_dir_ops = &mdd_lpf_dir_ops;
695 m->mdd_dot_lustre_objs.mdd_lpf = mdd_lpf;
701 * Create special in-memory "fid" object for open-by-fid.
703 static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
705 struct md_object *mdo;
706 struct mdd_object *mdd_obf;
707 struct lu_fid fid = LU_OBF_FID;
710 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
711 mdd_obf_dir_name, S_IFDIR | S_IXUSR, &fid);
715 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
717 RETURN(PTR_ERR(mdo));
719 LASSERT(lu_object_exists(&mdo->mo_lu));
721 mdd_obf = md2mdd_obj(mdo);
722 mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
723 m->mdd_dot_lustre_objs.mdd_obf = mdd_obf;
728 static void mdd_dot_lustre_cleanup(const struct lu_env *env,
729 struct mdd_device *m)
731 if (m->mdd_dot_lustre_objs.mdd_lpf != NULL) {
732 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_lpf);
733 m->mdd_dot_lustre_objs.mdd_lpf = NULL;
735 if (m->mdd_dot_lustre_objs.mdd_obf != NULL) {
736 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
737 m->mdd_dot_lustre_objs.mdd_obf = NULL;
739 if (m->mdd_dot_lustre != NULL) {
740 mdd_object_put(env, m->mdd_dot_lustre);
741 m->mdd_dot_lustre = NULL;
745 /** Setup ".lustre" directory object */
746 static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
748 struct md_object *mdo;
753 /* Create ".lustre" directory in ROOT. */
754 fid = LU_DOT_LUSTRE_FID;
755 rc = mdd_local_file_create(env, m, &m->mdd_root_fid,
757 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO,
761 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
763 RETURN(PTR_ERR(mdo));
764 LASSERT(lu_object_exists(&mdo->mo_lu));
766 m->mdd_dot_lustre = md2mdd_obj(mdo);
768 rc = mdd_obf_setup(env, m);
770 CERROR("%s: error initializing \"fid\" object: rc = %d.\n",
771 mdd2obd_dev(m)->obd_name, rc);
775 rc = mdd_lpf_setup(env, m);
777 CERROR("%s: error initializing \"lost+found\": rc = %d.\n",
778 mdd2obd_dev(m)->obd_name, rc);
785 mdd_dot_lustre_cleanup(env, m);
791 static struct llog_operations hsm_actions_logops;
794 * set llog methods and create LLOG_AGENT_ORIG_CTXT llog
795 * object in obd_device
797 static int mdd_hsm_actions_llog_init(const struct lu_env *env,
798 struct mdd_device *m)
800 struct obd_device *obd = mdd2obd_dev(m);
801 struct llog_ctxt *ctxt = NULL;
805 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
806 obd->obd_lvfs_ctxt.dt = m->mdd_bottom;
808 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_AGENT_ORIG_CTXT,
809 obd, &hsm_actions_logops);
811 CERROR("%s: hsm actions llog setup failed: rc = %d\n",
816 ctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
819 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
822 CERROR("%s: hsm actions llog open_create failed: rc = %d\n",
824 GOTO(out_cleanup, rc);
827 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
835 llog_cat_close(env, ctxt->loc_handle);
836 ctxt->loc_handle = NULL;
838 llog_cleanup(env, ctxt);
844 * cleanup the context created by llog_setup_named()
846 static int mdd_hsm_actions_llog_fini(const struct lu_env *env,
847 struct mdd_device *m)
849 struct obd_device *obd = mdd2obd_dev(m);
850 struct llog_ctxt *lctxt;
853 lctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
855 llog_cat_close(env, lctxt->loc_handle);
856 lctxt->loc_handle = NULL;
857 llog_cleanup(env, lctxt);
863 static void mdd_device_shutdown(const struct lu_env *env, struct mdd_device *m,
864 struct lustre_cfg *cfg)
866 lfsck_degister(env, m->mdd_bottom);
867 mdd_hsm_actions_llog_fini(env, m);
868 mdd_changelog_fini(env, m);
869 orph_index_fini(env, m);
870 mdd_dot_lustre_cleanup(env, m);
871 if (m->mdd_los != NULL) {
872 local_oid_storage_fini(env, m->mdd_los);
875 lu_site_purge(env, mdd2lu_dev(m)->ld_site, ~0);
877 if (m->mdd_child_exp)
878 obd_disconnect(m->mdd_child_exp);
881 static int mdd_process_config(const struct lu_env *env,
882 struct lu_device *d, struct lustre_cfg *cfg)
884 struct mdd_device *m = lu2mdd_dev(d);
885 struct dt_device *dt = m->mdd_child;
886 struct lu_device *next = &dt->dd_lu_dev;
890 switch (cfg->lcfg_command) {
892 struct lprocfs_static_vars lvars;
894 lprocfs_mdd_init_vars(&lvars);
895 rc = class_process_proc_param(PARAM_MDD, lvars.obd_vars, cfg,m);
896 if (rc > 0 || rc == -ENOSYS)
897 /* we don't understand; pass it on */
898 rc = next->ld_ops->ldo_process_config(env, next, cfg);
902 rc = next->ld_ops->ldo_process_config(env, next, cfg);
905 dt_conf_get(env, dt, &m->mdd_dt_conf);
908 rc = next->ld_ops->ldo_process_config(env, next, cfg);
909 lu_dev_del_linkage(d->ld_site, d);
910 mdd_device_shutdown(env, m, cfg);
913 rc = next->ld_ops->ldo_process_config(env, next, cfg);
920 static int mdd_recovery_complete(const struct lu_env *env,
923 struct mdd_device *mdd = lu2mdd_dev(d);
924 struct lu_device *next;
928 LASSERT(mdd != NULL);
929 next = &mdd->mdd_child->dd_lu_dev;
931 /* XXX: orphans handling. */
932 __mdd_orphan_cleanup(env, mdd);
933 rc = next->ld_ops->ldo_recovery_complete(env, next);
938 int mdd_local_file_create(const struct lu_env *env, struct mdd_device *mdd,
939 const struct lu_fid *pfid, const char *name, __u32 mode,
942 struct dt_object *parent, *dto;
947 LASSERT(!fid_is_zero(pfid));
948 parent = dt_locate(env, mdd->mdd_bottom, pfid);
949 if (unlikely(IS_ERR(parent)))
950 RETURN(PTR_ERR(parent));
952 /* create local file/dir, if @fid is passed then try to use it */
953 if (fid_is_zero(fid))
954 dto = local_file_find_or_create(env, mdd->mdd_los, parent,
957 dto = local_file_find_or_create_with_fid(env, mdd->mdd_bottom,
961 GOTO(out_put, rc = PTR_ERR(dto));
962 *fid = *lu_object_fid(&dto->do_lu);
963 /* since stack is not fully set up the local_storage uses own stack
964 * and we should drop its object from cache */
965 lu_object_put_nocache(env, &dto->do_lu);
968 lu_object_put(env, &parent->do_lu);
972 static int mdd_lfsck_out_notify(const struct lu_env *env, void *data,
973 enum lfsck_events event)
978 static int mdd_prepare(const struct lu_env *env,
979 struct lu_device *pdev,
980 struct lu_device *cdev)
982 struct mdd_device *mdd = lu2mdd_dev(cdev);
983 struct lu_device *next = &mdd->mdd_child->dd_lu_dev;
989 rc = next->ld_ops->ldo_prepare(env, cdev, next);
993 /* Setup local dirs */
994 fid.f_seq = FID_SEQ_LOCAL_NAME;
997 rc = local_oid_storage_init(env, mdd->mdd_bottom, &fid,
1002 rc = dt_root_get(env, mdd->mdd_child, &mdd->mdd_local_root_fid);
1007 if (mdd_seq_site(mdd)->ss_node_id == 0) {
1008 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
1009 mdd_root_dir_name, S_IFDIR |
1010 S_IRUGO | S_IWUSR | S_IXUGO, &fid);
1012 CERROR("%s: create root fid failed: rc = %d\n",
1013 mdd2obd_dev(mdd)->obd_name, rc);
1017 mdd->mdd_root_fid = fid;
1018 rc = mdd_dot_lustre_setup(env, mdd);
1020 CERROR("%s: initializing .lustre failed: rc = %d\n",
1021 mdd2obd_dev(mdd)->obd_name, rc);
1025 rc = mdd_compat_fixes(env, mdd);
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);
1110 * No permission check is needed.
1112 static int mdd_init_capa_ctxt(const struct lu_env *env, struct md_device *m,
1113 int mode, unsigned long timeout, __u32 alg,
1114 struct lustre_capa_key *keys)
1116 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1120 /* need barrier for mds_capa_keys access. */
1122 rc = mdd_child_ops(mdd)->dt_init_capa_ctxt(env, mdd->mdd_child, mode,
1123 timeout, alg, keys);
1127 static int mdd_maxeasize_get(const struct lu_env *env, struct md_device *m,
1130 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1133 *easize = mdd->mdd_dt_conf.ddp_max_ea_size;
1138 static int mdd_update_capa_key(const struct lu_env *env,
1139 struct md_device *m,
1140 struct lustre_capa_key *key)
1142 /* we do not support capabilities ... */
1146 static int mdd_llog_ctxt_get(const struct lu_env *env, struct md_device *m,
1149 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1151 *h = llog_group_get_ctxt(&mdd2obd_dev(mdd)->obd_olg, idx);
1152 return (*h == NULL ? -ENOENT : 0);
1155 static struct lu_device *mdd_device_free(const struct lu_env *env,
1156 struct lu_device *lu)
1158 struct mdd_device *m = lu2mdd_dev(lu);
1161 LASSERT(atomic_read(&lu->ld_ref) == 0);
1162 md_device_fini(&m->mdd_md_dev);
1167 static struct lu_device *mdd_device_alloc(const struct lu_env *env,
1168 struct lu_device_type *t,
1169 struct lustre_cfg *lcfg)
1171 struct lu_device *l;
1172 struct mdd_device *m;
1176 l = ERR_PTR(-ENOMEM);
1181 md_device_init(&m->mdd_md_dev, t);
1182 rc = mdd_init0(env, m, t, lcfg);
1184 mdd_device_free(env, l);
1193 * we use exports to track all mdd users
1195 static int mdd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1196 struct obd_device *obd, struct obd_uuid *cluuid,
1197 struct obd_connect_data *data, void *localdata)
1199 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1200 struct lustre_handle conn;
1204 CDEBUG(D_CONFIG, "connect #%d\n", mdd->mdd_connects);
1206 rc = class_connect(&conn, obd, cluuid);
1210 *exp = class_conn2export(&conn);
1212 /* Why should there ever be more than 1 connect? */
1213 LASSERT(mdd->mdd_connects == 0);
1214 mdd->mdd_connects++;
1220 * once last export (we don't count self-export) disappeared
1221 * mdd can be released
1223 static int mdd_obd_disconnect(struct obd_export *exp)
1225 struct obd_device *obd = exp->exp_obd;
1226 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1227 int rc, release = 0;
1230 mdd->mdd_connects--;
1231 if (mdd->mdd_connects == 0)
1234 rc = class_disconnect(exp);
1236 if (rc == 0 && release)
1237 class_manual_cleanup(obd);
1241 static int mdd_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1242 __u32 keylen, void *key, __u32 *vallen, void *val,
1243 struct lov_stripe_md *lsm)
1247 if (KEY_IS(KEY_OSP_CONNECTED)) {
1248 struct obd_device *obd = exp->exp_obd;
1249 struct mdd_device *mdd;
1251 if (!obd->obd_set_up || obd->obd_stopping)
1254 mdd = lu2mdd_dev(obd->obd_lu_dev);
1256 rc = obd_get_info(env, mdd->mdd_child_exp, keylen, key, vallen,
1264 static struct obd_ops mdd_obd_device_ops = {
1265 .o_owner = THIS_MODULE,
1266 .o_connect = mdd_obd_connect,
1267 .o_disconnect = mdd_obd_disconnect,
1268 .o_get_info = mdd_obd_get_info,
1271 static int mdd_changelog_user_register(const struct lu_env *env,
1272 struct mdd_device *mdd, int *id)
1274 struct llog_ctxt *ctxt;
1275 struct llog_changelog_user_rec *rec;
1279 ctxt = llog_get_context(mdd2obd_dev(mdd),
1280 LLOG_CHANGELOG_USER_ORIG_CTXT);
1286 llog_ctxt_put(ctxt);
1290 /* Assume we want it on since somebody registered */
1291 rc = mdd_changelog_on(env, mdd, 1);
1295 rec->cur_hdr.lrh_len = sizeof(*rec);
1296 rec->cur_hdr.lrh_type = CHANGELOG_USER_REC;
1297 spin_lock(&mdd->mdd_cl.mc_user_lock);
1298 if (mdd->mdd_cl.mc_lastuser == (unsigned int)(-1)) {
1299 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1300 CERROR("Maximum number of changelog users exceeded!\n");
1301 GOTO(out, rc = -EOVERFLOW);
1303 *id = rec->cur_id = ++mdd->mdd_cl.mc_lastuser;
1304 rec->cur_endrec = mdd->mdd_cl.mc_index;
1305 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1307 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cur_hdr, NULL, NULL);
1309 CDEBUG(D_IOCTL, "Registered changelog user %d\n", *id);
1312 llog_ctxt_put(ctxt);
1316 struct mdd_changelog_user_data {
1317 __u64 mcud_endrec; /**< purge record for this user */
1318 __u64 mcud_minrec; /**< lowest changelog recno still referenced */
1320 __u32 mcud_minid; /**< user id with lowest rec reference */
1321 __u32 mcud_usercount;
1322 unsigned int mcud_found:1;
1324 #define MCUD_UNREGISTER -1LL
1327 * 1. Find the smallest record everyone is willing to purge
1328 * 2. Update the last purgeable record for this user
1330 static int mdd_changelog_user_purge_cb(const struct lu_env *env,
1331 struct llog_handle *llh,
1332 struct llog_rec_hdr *hdr, void *data)
1334 struct llog_changelog_user_rec *rec;
1335 struct mdd_changelog_user_data *mcud = data;
1340 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
1342 rec = (struct llog_changelog_user_rec *)hdr;
1344 mcud->mcud_usercount++;
1346 /* If we have a new endrec for this id, use it for the following
1347 min check instead of its old value */
1348 if (rec->cur_id == mcud->mcud_id)
1349 rec->cur_endrec = max(rec->cur_endrec, mcud->mcud_endrec);
1351 /* Track the minimum referenced record */
1352 if (mcud->mcud_minid == 0 || mcud->mcud_minrec > rec->cur_endrec) {
1353 mcud->mcud_minid = rec->cur_id;
1354 mcud->mcud_minrec = rec->cur_endrec;
1357 if (rec->cur_id != mcud->mcud_id)
1360 /* Update this user's record */
1361 mcud->mcud_found = 1;
1363 /* Special case: unregister this user */
1364 if (mcud->mcud_endrec == MCUD_UNREGISTER) {
1365 struct llog_cookie cookie;
1367 cookie.lgc_lgl = llh->lgh_id;
1368 cookie.lgc_index = hdr->lrh_index;
1370 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
1373 mcud->mcud_usercount--;
1378 /* Update the endrec */
1379 CDEBUG(D_IOCTL, "Rewriting changelog user %d endrec to "LPU64"\n",
1380 mcud->mcud_id, rec->cur_endrec);
1382 /* hdr+1 is loc of data */
1383 hdr->lrh_len -= sizeof(*hdr) + sizeof(struct llog_rec_tail);
1384 rc = llog_write(env, llh, hdr, NULL, 0, (void *)(hdr + 1),
1390 static int mdd_changelog_user_purge(const struct lu_env *env,
1391 struct mdd_device *mdd, int id,
1394 struct mdd_changelog_user_data data;
1395 struct llog_ctxt *ctxt;
1399 CDEBUG(D_IOCTL, "Purge request: id=%d, endrec=%lld\n", id, endrec);
1402 data.mcud_minid = 0;
1403 data.mcud_minrec = 0;
1404 data.mcud_usercount = 0;
1405 data.mcud_endrec = endrec;
1406 spin_lock(&mdd->mdd_cl.mc_lock);
1407 endrec = mdd->mdd_cl.mc_index;
1408 spin_unlock(&mdd->mdd_cl.mc_lock);
1409 if ((data.mcud_endrec == 0) ||
1410 ((data.mcud_endrec > endrec) &&
1411 (data.mcud_endrec != MCUD_UNREGISTER)))
1412 data.mcud_endrec = endrec;
1414 ctxt = llog_get_context(mdd2obd_dev(mdd),
1415 LLOG_CHANGELOG_USER_ORIG_CTXT);
1419 LASSERT(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
1421 rc = llog_cat_process(env, ctxt->loc_handle,
1422 mdd_changelog_user_purge_cb, (void *)&data,
1424 if ((rc >= 0) && (data.mcud_minrec > 0)) {
1425 CDEBUG(D_IOCTL, "Purging changelog entries up to "LPD64
1426 ", referenced by "CHANGELOG_USER_PREFIX"%d\n",
1427 data.mcud_minrec, data.mcud_minid);
1428 rc = mdd_changelog_llog_cancel(env, mdd, data.mcud_minrec);
1430 CWARN("Could not determine changelog records to purge; rc=%d\n",
1434 llog_ctxt_put(ctxt);
1436 if (!data.mcud_found) {
1437 CWARN("No entry for user %d. Last changelog reference is "
1438 LPD64" by changelog user %d\n", data.mcud_id,
1439 data.mcud_minrec, data.mcud_minid);
1443 if (!rc && data.mcud_usercount == 0)
1444 /* No more users; turn changelogs off */
1445 rc = mdd_changelog_on(env, mdd, 0);
1451 * May be called remotely from mdt_iocontrol_handle or locally from
1452 * mdt_iocontrol. Data may be freeform - remote handling doesn't enforce
1453 * an obd_ioctl_data format (but local ioctl handler does).
1455 * \param len - data len
1456 * \param karg - ioctl data, in kernel space
1458 static int mdd_iocontrol(const struct lu_env *env, struct md_device *m,
1459 unsigned int cmd, int len, void *karg)
1461 struct mdd_device *mdd;
1462 struct obd_ioctl_data *data = karg;
1466 mdd = lu2mdd_dev(&m->md_lu_dev);
1468 /* Doesn't use obd_ioctl_data */
1470 case OBD_IOC_CHANGELOG_CLEAR: {
1471 struct changelog_setinfo *cs = karg;
1472 rc = mdd_changelog_user_purge(env, mdd, cs->cs_id,
1476 case OBD_IOC_GET_MNTOPT: {
1477 mntopt_t *mntopts = (mntopt_t *)karg;
1478 *mntopts = mdd->mdd_dt_conf.ddp_mntopts;
1481 case OBD_IOC_START_LFSCK: {
1482 rc = lfsck_start(env, mdd->mdd_bottom,
1483 (struct lfsck_start_param *)karg);
1486 case OBD_IOC_STOP_LFSCK: {
1487 rc = lfsck_stop(env, mdd->mdd_bottom,
1488 (struct lfsck_stop *)karg);
1493 /* Below ioctls use obd_ioctl_data */
1494 if (len != sizeof(*data)) {
1495 CERROR("Bad ioctl size %d\n", len);
1498 if (data->ioc_version != OBD_IOCTL_VERSION) {
1499 CERROR("Bad magic %x != %x\n", data->ioc_version,
1505 case OBD_IOC_CHANGELOG_REG:
1506 rc = mdd_changelog_user_register(env, mdd, &data->ioc_u32_1);
1508 case OBD_IOC_CHANGELOG_DEREG:
1509 rc = mdd_changelog_user_purge(env, mdd, data->ioc_u32_1,
1519 /* type constructor/destructor: mdd_type_init, mdd_type_fini */
1520 LU_TYPE_INIT_FINI(mdd, &mdd_thread_key);
1522 static const struct md_device_operations mdd_ops = {
1523 .mdo_statfs = mdd_statfs,
1524 .mdo_root_get = mdd_root_get,
1525 .mdo_init_capa_ctxt = mdd_init_capa_ctxt,
1526 .mdo_update_capa_key= mdd_update_capa_key,
1527 .mdo_llog_ctxt_get = mdd_llog_ctxt_get,
1528 .mdo_iocontrol = mdd_iocontrol,
1529 .mdo_maxeasize_get = mdd_maxeasize_get,
1532 static struct lu_device_type_operations mdd_device_type_ops = {
1533 .ldto_init = mdd_type_init,
1534 .ldto_fini = mdd_type_fini,
1536 .ldto_start = mdd_type_start,
1537 .ldto_stop = mdd_type_stop,
1539 .ldto_device_alloc = mdd_device_alloc,
1540 .ldto_device_free = mdd_device_free,
1542 .ldto_device_fini = mdd_device_fini
1545 static struct lu_device_type mdd_device_type = {
1546 .ldt_tags = LU_DEVICE_MD,
1547 .ldt_name = LUSTRE_MDD_NAME,
1548 .ldt_ops = &mdd_device_type_ops,
1549 .ldt_ctx_tags = LCT_MD_THREAD
1552 /* context key constructor: mdd_key_init */
1553 LU_KEY_INIT(mdd, struct mdd_thread_info);
1555 static void mdd_key_fini(const struct lu_context *ctx,
1556 struct lu_context_key *key, void *data)
1558 struct mdd_thread_info *info = data;
1560 lu_buf_free(&info->mti_big_buf);
1561 lu_buf_free(&info->mti_link_buf);
1566 /* context key: mdd_thread_key */
1567 LU_CONTEXT_KEY_DEFINE(mdd, LCT_MD_THREAD);
1569 static int __init mdd_mod_init(void)
1571 struct lprocfs_static_vars lvars;
1574 lprocfs_mdd_init_vars(&lvars);
1576 rc = lu_kmem_init(mdd_caches);
1580 changelog_orig_logops = llog_osd_ops;
1581 changelog_orig_logops.lop_cancel = llog_changelog_cancel;
1582 changelog_orig_logops.lop_add = llog_cat_add_rec;
1583 changelog_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1585 hsm_actions_logops = llog_osd_ops;
1586 hsm_actions_logops.lop_add = llog_cat_add_rec;
1587 hsm_actions_logops.lop_declare_add = llog_cat_declare_add_rec;
1589 rc = class_register_type(&mdd_obd_device_ops, NULL, true, NULL,
1590 #ifndef HAVE_ONLY_PROCFS_SEQ
1593 LUSTRE_MDD_NAME, &mdd_device_type);
1595 lu_kmem_fini(mdd_caches);
1599 static void __exit mdd_mod_exit(void)
1601 class_unregister_type(LUSTRE_MDD_NAME);
1602 lu_kmem_fini(mdd_caches);
1605 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1606 MODULE_DESCRIPTION("Lustre Meta-data Device Prototype ("LUSTRE_MDD_NAME")");
1607 MODULE_LICENSE("GPL");
1609 cfs_module(mdd, "0.1.0", mdd_mod_init, mdd_mod_exit);