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 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 lov_stripe_md *lsm, int count,
239 struct llog_cookie *cookies, int flags)
241 struct llog_handle *cathandle = ctxt->loc_handle;
246 /* This should only be called with the catalog handle */
247 LASSERT(cathandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
249 rc = llog_cat_process(env, cathandle, llog_changelog_cancel_cb,
250 (void *)cookies, 0, 0);
252 /* 0 or 1 means we're done */
255 CERROR("%s: cancel idx %u of catalog "DOSTID" rc=%d\n",
256 ctxt->loc_obd->obd_name, cathandle->lgh_last_idx,
257 POSTID(&cathandle->lgh_id.lgl_oi), rc);
262 static struct llog_operations changelog_orig_logops;
264 int 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);
408 int mdd_changelog_write_header(const struct lu_env *env,
409 struct mdd_device *mdd, int markerflags);
411 /* Start / stop recording */
412 int mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on)
416 if ((on == 1) && ((mdd->mdd_cl.mc_flags & CLM_ON) == 0)) {
417 LCONSOLE_INFO("%s: changelog on\n", mdd2obd_dev(mdd)->obd_name);
418 if (mdd->mdd_cl.mc_flags & CLM_ERR) {
419 CERROR("Changelogs cannot be enabled due to error "
420 "condition (see %s log).\n",
421 mdd2obd_dev(mdd)->obd_name);
424 spin_lock(&mdd->mdd_cl.mc_lock);
425 mdd->mdd_cl.mc_flags |= CLM_ON;
426 spin_unlock(&mdd->mdd_cl.mc_lock);
427 rc = mdd_changelog_write_header(env, mdd, CLM_START);
429 } else if ((on == 0) && ((mdd->mdd_cl.mc_flags & CLM_ON) == CLM_ON)) {
430 LCONSOLE_INFO("%s: changelog off\n",mdd2obd_dev(mdd)->obd_name);
431 rc = mdd_changelog_write_header(env, mdd, CLM_FINI);
432 spin_lock(&mdd->mdd_cl.mc_lock);
433 mdd->mdd_cl.mc_flags &= ~CLM_ON;
434 spin_unlock(&mdd->mdd_cl.mc_lock);
439 /** Remove entries with indicies up to and including \a endrec from the
445 int mdd_changelog_llog_cancel(const struct lu_env *env,
446 struct mdd_device *mdd, long long endrec)
448 struct obd_device *obd = mdd2obd_dev(mdd);
449 struct llog_ctxt *ctxt;
450 long long unsigned cur;
453 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
457 spin_lock(&mdd->mdd_cl.mc_lock);
458 cur = (long long)mdd->mdd_cl.mc_index;
459 spin_unlock(&mdd->mdd_cl.mc_lock);
463 /* purge to "0" is shorthand for everything */
467 /* If purging all records, write a header entry so we don't have an
468 empty catalog and we're sure to have a valid starting index next
469 time. In case of crash, we just restart with old log so we're
472 /* XXX: transaction is started by llog itself */
473 rc = mdd_changelog_write_header(env, mdd, CLM_PURGE);
478 /* Some records were purged, so reset repeat-access time (so we
479 record new mtime update records, so users can see a file has been
480 changed since the last purge) */
481 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
483 rc = llog_cancel(env, ctxt, NULL, 1, (struct llog_cookie *)&endrec, 0);
489 /** Add a CL_MARK record to the changelog
491 * \param markerflags - CLM_*
494 int mdd_changelog_write_header(const struct lu_env *env,
495 struct mdd_device *mdd, int markerflags)
497 struct obd_device *obd = mdd2obd_dev(mdd);
498 struct llog_changelog_rec *rec;
500 struct llog_ctxt *ctxt;
502 int len = strlen(obd->obd_name);
507 if (mdd->mdd_cl.mc_mask & (1 << CL_MARK)) {
508 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
512 reclen = llog_data_len(sizeof(*rec) + len);
513 buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
514 if (buf->lb_buf == NULL)
518 rec->cr.cr_flags = CLF_VERSION;
519 rec->cr.cr_type = CL_MARK;
520 rec->cr.cr_namelen = len;
521 memcpy(rec->cr.cr_name, obd->obd_name, rec->cr.cr_namelen);
522 /* Status and action flags */
523 rec->cr.cr_markerflags = mdd->mdd_cl.mc_flags | markerflags;
524 rec->cr_hdr.lrh_len = llog_data_len(sizeof(*rec) + rec->cr.cr_namelen);
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, 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: bad FID format [%s], should be "DFID"\n",
563 mdd2obd_dev(mdd)->obd_name, lname->ln_name,
564 (__u64)FID_SEQ_NORMAL, 1, 0);
565 GOTO(out, rc = -EINVAL);
568 if (!fid_is_norm(f) && !fid_is_igif(f) && !fid_is_root(f) &&
569 !fid_seq_is_dot(f->f_seq)) {
570 CWARN("%s: "DFID" is invalid, sequence should be "
571 ">= "LPX64" or within ["LPX64","LPX64"].\n",
572 mdd2obd_dev(mdd)->obd_name, PFID(f),
573 (__u64)FID_SEQ_NORMAL, (__u64)FID_SEQ_IGIF,
574 (__u64)FID_SEQ_IGIF_MAX);
575 GOTO(out, rc = -EINVAL);
578 /* Check if object with this fid exists */
579 child = mdd_object_find(env, mdd, f);
583 GOTO(out, rc = PTR_ERR(child));
585 if (mdd_object_exists(child) == 0)
588 mdd_object_put(env, child);
594 static int mdd_dummy_create(const struct lu_env *env,
595 struct md_object *pobj,
596 const struct lu_name *lname,
597 struct md_object *child,
598 struct md_op_spec *spec,
604 static int mdd_dummy_rename(const struct lu_env *env,
605 struct md_object *src_pobj,
606 struct md_object *tgt_pobj,
607 const struct lu_fid *lf,
608 const struct lu_name *lsname,
609 struct md_object *tobj,
610 const struct lu_name *ltname,
616 static int mdd_dummy_link(const struct lu_env *env,
617 struct md_object *tgt_obj,
618 struct md_object *src_obj,
619 const struct lu_name *lname,
625 static int mdd_dummy_unlink(const struct lu_env *env,
626 struct md_object *pobj,
627 struct md_object *cobj,
628 const struct lu_name *lname,
635 static struct md_dir_operations mdd_obf_dir_ops = {
636 .mdo_lookup = obf_lookup,
637 .mdo_create = mdd_dummy_create,
638 .mdo_rename = mdd_dummy_rename,
639 .mdo_link = mdd_dummy_link,
640 .mdo_unlink = mdd_dummy_unlink
643 static struct md_dir_operations mdd_lpf_dir_ops = {
644 .mdo_lookup = mdd_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_object *mdo_locate(const struct lu_env *env,
652 struct md_device *md,
653 const struct lu_fid *fid)
655 struct lu_object *obj;
656 struct md_object *mdo;
658 obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
660 obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
661 LASSERT(obj != NULL);
664 mdo = ERR_PTR(PTR_ERR(obj));
669 static int mdd_lpf_setup(const struct lu_env *env, struct mdd_device *m)
671 struct md_object *mdo;
672 struct mdd_object *mdd_lpf;
673 struct lu_fid fid = LU_LPF_FID;
677 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
678 mdd_lpf_dir_name, S_IFDIR | S_IRUSR | S_IXUSR,
683 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
685 RETURN(PTR_ERR(mdo));
687 LASSERT(lu_object_exists(&mdo->mo_lu));
689 mdd_lpf = md2mdd_obj(mdo);
690 mdd_lpf->mod_obj.mo_dir_ops = &mdd_lpf_dir_ops;
691 m->mdd_dot_lustre_objs.mdd_lpf = mdd_lpf;
697 * Create special in-memory "fid" object for open-by-fid.
699 static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
701 struct md_object *mdo;
702 struct mdd_object *mdd_obf;
703 struct lu_fid fid = LU_OBF_FID;
706 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
707 mdd_obf_dir_name, S_IFDIR | S_IXUSR, &fid);
711 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
713 RETURN(PTR_ERR(mdo));
715 LASSERT(lu_object_exists(&mdo->mo_lu));
717 mdd_obf = md2mdd_obj(mdo);
718 mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
719 m->mdd_dot_lustre_objs.mdd_obf = mdd_obf;
724 static void mdd_dot_lustre_cleanup(const struct lu_env *env,
725 struct mdd_device *m)
727 if (m->mdd_dot_lustre_objs.mdd_lpf != NULL) {
728 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_lpf);
729 m->mdd_dot_lustre_objs.mdd_lpf = NULL;
731 if (m->mdd_dot_lustre_objs.mdd_obf != NULL) {
732 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
733 m->mdd_dot_lustre_objs.mdd_obf = NULL;
735 if (m->mdd_dot_lustre != NULL) {
736 mdd_object_put(env, m->mdd_dot_lustre);
737 m->mdd_dot_lustre = NULL;
741 /** Setup ".lustre" directory object */
742 static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
744 struct md_object *mdo;
749 /* Create ".lustre" directory in ROOT. */
750 fid = LU_DOT_LUSTRE_FID;
751 rc = mdd_local_file_create(env, m, &m->mdd_root_fid,
753 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO,
757 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
759 RETURN(PTR_ERR(mdo));
760 LASSERT(lu_object_exists(&mdo->mo_lu));
762 m->mdd_dot_lustre = md2mdd_obj(mdo);
764 rc = mdd_obf_setup(env, m);
766 CERROR("%s: error initializing \"fid\" object: rc = %d.\n",
767 mdd2obd_dev(m)->obd_name, rc);
771 rc = mdd_lpf_setup(env, m);
773 CERROR("%s: error initializing \"lost+found\": rc = %d.\n",
774 mdd2obd_dev(m)->obd_name, rc);
781 mdd_dot_lustre_cleanup(env, m);
787 static struct llog_operations hsm_actions_logops;
790 * set llog methods and create LLOG_AGENT_ORIG_CTXT llog
791 * object in obd_device
793 static int mdd_hsm_actions_llog_init(const struct lu_env *env,
794 struct mdd_device *m)
796 struct obd_device *obd = mdd2obd_dev(m);
797 struct llog_ctxt *ctxt = NULL;
801 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
802 obd->obd_lvfs_ctxt.dt = m->mdd_bottom;
804 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_AGENT_ORIG_CTXT,
805 obd, &hsm_actions_logops);
807 CERROR("%s: hsm actions llog setup failed: rc = %d\n",
812 ctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
815 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
818 CERROR("%s: hsm actions llog open_create failed: rc = %d\n",
820 GOTO(out_cleanup, rc);
823 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
831 llog_cat_close(env, ctxt->loc_handle);
832 ctxt->loc_handle = NULL;
834 llog_cleanup(env, ctxt);
840 * cleanup the context created by llog_setup_named()
842 static int mdd_hsm_actions_llog_fini(const struct lu_env *env,
843 struct mdd_device *m)
845 struct obd_device *obd = mdd2obd_dev(m);
846 struct llog_ctxt *lctxt;
849 lctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
851 llog_cat_close(env, lctxt->loc_handle);
852 lctxt->loc_handle = NULL;
853 llog_cleanup(env, lctxt);
859 static void mdd_device_shutdown(const struct lu_env *env, struct mdd_device *m,
860 struct lustre_cfg *cfg)
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);
869 lu_site_purge(env, mdd2lu_dev(m)->ld_site, ~0);
871 if (m->mdd_child_exp)
872 obd_disconnect(m->mdd_child_exp);
875 static int mdd_process_config(const struct lu_env *env,
876 struct lu_device *d, struct lustre_cfg *cfg)
878 struct mdd_device *m = lu2mdd_dev(d);
879 struct dt_device *dt = m->mdd_child;
880 struct lu_device *next = &dt->dd_lu_dev;
884 switch (cfg->lcfg_command) {
886 struct lprocfs_static_vars lvars;
888 lprocfs_mdd_init_vars(&lvars);
889 rc = class_process_proc_param(PARAM_MDD, lvars.obd_vars, cfg,m);
890 if (rc > 0 || rc == -ENOSYS)
891 /* we don't understand; pass it on */
892 rc = next->ld_ops->ldo_process_config(env, next, cfg);
896 rc = next->ld_ops->ldo_process_config(env, next, cfg);
899 dt_conf_get(env, dt, &m->mdd_dt_conf);
902 rc = next->ld_ops->ldo_process_config(env, next, cfg);
903 lu_dev_del_linkage(d->ld_site, d);
904 mdd_device_shutdown(env, m, cfg);
907 rc = next->ld_ops->ldo_process_config(env, next, cfg);
914 static int mdd_recovery_complete(const struct lu_env *env,
917 struct mdd_device *mdd = lu2mdd_dev(d);
918 struct lu_device *next;
922 LASSERT(mdd != NULL);
923 next = &mdd->mdd_child->dd_lu_dev;
925 /* XXX: orphans handling. */
926 __mdd_orphan_cleanup(env, mdd);
927 rc = next->ld_ops->ldo_recovery_complete(env, next);
932 int mdd_local_file_create(const struct lu_env *env, struct mdd_device *mdd,
933 const struct lu_fid *pfid, const char *name, __u32 mode,
936 struct dt_object *parent, *dto;
941 LASSERT(!fid_is_zero(pfid));
942 parent = dt_locate(env, mdd->mdd_bottom, pfid);
943 if (unlikely(IS_ERR(parent)))
944 RETURN(PTR_ERR(parent));
946 /* create local file/dir, if @fid is passed then try to use it */
947 if (fid_is_zero(fid))
948 dto = local_file_find_or_create(env, mdd->mdd_los, parent,
951 dto = local_file_find_or_create_with_fid(env, mdd->mdd_bottom,
955 GOTO(out_put, rc = PTR_ERR(dto));
956 *fid = *lu_object_fid(&dto->do_lu);
957 /* since stack is not fully set up the local_storage uses own stack
958 * and we should drop its object from cache */
959 lu_object_put_nocache(env, &dto->do_lu);
962 lu_object_put(env, &parent->do_lu);
966 static int mdd_lfsck_out_notify(const struct lu_env *env, void *data,
967 enum lfsck_events event)
972 static int mdd_prepare(const struct lu_env *env,
973 struct lu_device *pdev,
974 struct lu_device *cdev)
976 struct mdd_device *mdd = lu2mdd_dev(cdev);
977 struct lu_device *next = &mdd->mdd_child->dd_lu_dev;
983 rc = next->ld_ops->ldo_prepare(env, cdev, next);
987 /* Setup local dirs */
988 fid.f_seq = FID_SEQ_LOCAL_NAME;
991 rc = local_oid_storage_init(env, mdd->mdd_bottom, &fid,
996 rc = dt_root_get(env, mdd->mdd_child, &mdd->mdd_local_root_fid);
1001 if (mdd_seq_site(mdd)->ss_node_id == 0) {
1002 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
1003 mdd_root_dir_name, S_IFDIR |
1004 S_IRUGO | S_IWUSR | S_IXUGO, &fid);
1006 CERROR("%s: create root fid failed: rc = %d\n",
1007 mdd2obd_dev(mdd)->obd_name, rc);
1011 mdd->mdd_root_fid = fid;
1012 rc = mdd_dot_lustre_setup(env, mdd);
1014 CERROR("%s: initializing .lustre failed: rc = %d\n",
1015 mdd2obd_dev(mdd)->obd_name, rc);
1019 rc = mdd_compat_fixes(env, mdd);
1023 /* Normal client usually send root access to MDT0 directly,
1024 * the root FID on non-MDT0 will only be used by echo client. */
1025 mdd->mdd_root_fid = fid;
1028 rc = orph_index_init(env, mdd);
1032 rc = mdd_changelog_init(env, mdd);
1034 CERROR("%s: failed to initialize changelog: rc = %d\n",
1035 mdd2obd_dev(mdd)->obd_name, rc);
1039 rc = mdd_hsm_actions_llog_init(env, mdd);
1041 GOTO(out_changelog, rc);
1043 rc = lfsck_register(env, mdd->mdd_bottom, mdd->mdd_child,
1044 mdd2obd_dev(mdd), mdd_lfsck_out_notify,
1047 CERROR("%s: failed to initialize lfsck: rc = %d\n",
1048 mdd2obd_dev(mdd)->obd_name, rc);
1053 mdd_hsm_actions_llog_fini(env, mdd);
1055 mdd_changelog_fini(env, mdd);
1057 orph_index_fini(env, mdd);
1059 if (mdd_seq_site(mdd)->ss_node_id == 0)
1060 mdd_dot_lustre_cleanup(env, mdd);
1062 local_oid_storage_fini(env, mdd->mdd_los);
1063 mdd->mdd_los = NULL;
1068 const struct lu_device_operations mdd_lu_ops = {
1069 .ldo_object_alloc = mdd_object_alloc,
1070 .ldo_process_config = mdd_process_config,
1071 .ldo_recovery_complete = mdd_recovery_complete,
1072 .ldo_prepare = mdd_prepare,
1075 static int mdd_root_get(const struct lu_env *env,
1076 struct md_device *m, struct lu_fid *f)
1078 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1081 *f = mdd->mdd_root_fid;
1086 * No permission check is needed.
1088 static int mdd_statfs(const struct lu_env *env, struct md_device *m,
1089 struct obd_statfs *sfs)
1091 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1096 rc = mdd_child_ops(mdd)->dt_statfs(env, mdd->mdd_child, sfs);
1098 sfs->os_namelen = min_t(__u32, sfs->os_namelen, NAME_MAX);
1104 * No permission check is needed.
1106 static int mdd_init_capa_ctxt(const struct lu_env *env, struct md_device *m,
1107 int mode, unsigned long timeout, __u32 alg,
1108 struct lustre_capa_key *keys)
1110 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1114 /* need barrier for mds_capa_keys access. */
1116 rc = mdd_child_ops(mdd)->dt_init_capa_ctxt(env, mdd->mdd_child, mode,
1117 timeout, alg, keys);
1121 static int mdd_maxeasize_get(const struct lu_env *env, struct md_device *m,
1124 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1127 *easize = mdd->mdd_dt_conf.ddp_max_ea_size;
1132 static int mdd_update_capa_key(const struct lu_env *env,
1133 struct md_device *m,
1134 struct lustre_capa_key *key)
1136 /* we do not support capabilities ... */
1140 static int mdd_llog_ctxt_get(const struct lu_env *env, struct md_device *m,
1143 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1145 *h = llog_group_get_ctxt(&mdd2obd_dev(mdd)->obd_olg, idx);
1146 return (*h == NULL ? -ENOENT : 0);
1149 static struct lu_device *mdd_device_free(const struct lu_env *env,
1150 struct lu_device *lu)
1152 struct mdd_device *m = lu2mdd_dev(lu);
1155 LASSERT(atomic_read(&lu->ld_ref) == 0);
1156 md_device_fini(&m->mdd_md_dev);
1161 static struct lu_device *mdd_device_alloc(const struct lu_env *env,
1162 struct lu_device_type *t,
1163 struct lustre_cfg *lcfg)
1165 struct lu_device *l;
1166 struct mdd_device *m;
1170 l = ERR_PTR(-ENOMEM);
1175 md_device_init(&m->mdd_md_dev, t);
1176 rc = mdd_init0(env, m, t, lcfg);
1178 mdd_device_free(env, l);
1187 * we use exports to track all mdd users
1189 static int mdd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1190 struct obd_device *obd, struct obd_uuid *cluuid,
1191 struct obd_connect_data *data, void *localdata)
1193 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1194 struct lustre_handle conn;
1198 CDEBUG(D_CONFIG, "connect #%d\n", mdd->mdd_connects);
1200 rc = class_connect(&conn, obd, cluuid);
1204 *exp = class_conn2export(&conn);
1206 /* Why should there ever be more than 1 connect? */
1207 LASSERT(mdd->mdd_connects == 0);
1208 mdd->mdd_connects++;
1214 * once last export (we don't count self-export) disappeared
1215 * mdd can be released
1217 static int mdd_obd_disconnect(struct obd_export *exp)
1219 struct obd_device *obd = exp->exp_obd;
1220 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1221 int rc, release = 0;
1224 mdd->mdd_connects--;
1225 if (mdd->mdd_connects == 0)
1228 rc = class_disconnect(exp);
1230 if (rc == 0 && release)
1231 class_manual_cleanup(obd);
1235 static int mdd_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1236 __u32 keylen, void *key, __u32 *vallen, void *val,
1237 struct lov_stripe_md *lsm)
1241 if (KEY_IS(KEY_OSP_CONNECTED)) {
1242 struct obd_device *obd = exp->exp_obd;
1243 struct mdd_device *mdd;
1245 if (!obd->obd_set_up || obd->obd_stopping)
1248 mdd = lu2mdd_dev(obd->obd_lu_dev);
1250 rc = obd_get_info(env, mdd->mdd_child_exp, keylen, key, vallen,
1258 static struct obd_ops mdd_obd_device_ops = {
1259 .o_owner = THIS_MODULE,
1260 .o_connect = mdd_obd_connect,
1261 .o_disconnect = mdd_obd_disconnect,
1262 .o_get_info = mdd_obd_get_info,
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, 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 /* hdr+1 is loc of data */
1377 hdr->lrh_len -= sizeof(*hdr) + sizeof(struct llog_rec_tail);
1378 rc = llog_write(env, llh, hdr, NULL, 0, (void *)(hdr + 1),
1384 static int mdd_changelog_user_purge(const struct lu_env *env,
1385 struct mdd_device *mdd, int id,
1388 struct mdd_changelog_user_data data;
1389 struct llog_ctxt *ctxt;
1393 CDEBUG(D_IOCTL, "Purge request: id=%d, endrec=%lld\n", id, endrec);
1396 data.mcud_minid = 0;
1397 data.mcud_minrec = 0;
1398 data.mcud_usercount = 0;
1399 data.mcud_endrec = endrec;
1400 spin_lock(&mdd->mdd_cl.mc_lock);
1401 endrec = mdd->mdd_cl.mc_index;
1402 spin_unlock(&mdd->mdd_cl.mc_lock);
1403 if ((data.mcud_endrec == 0) ||
1404 ((data.mcud_endrec > endrec) &&
1405 (data.mcud_endrec != MCUD_UNREGISTER)))
1406 data.mcud_endrec = endrec;
1408 ctxt = llog_get_context(mdd2obd_dev(mdd),
1409 LLOG_CHANGELOG_USER_ORIG_CTXT);
1413 LASSERT(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
1415 rc = llog_cat_process(env, ctxt->loc_handle,
1416 mdd_changelog_user_purge_cb, (void *)&data,
1418 if ((rc >= 0) && (data.mcud_minrec > 0)) {
1419 CDEBUG(D_IOCTL, "Purging changelog entries up to "LPD64
1420 ", referenced by "CHANGELOG_USER_PREFIX"%d\n",
1421 data.mcud_minrec, data.mcud_minid);
1422 rc = mdd_changelog_llog_cancel(env, mdd, data.mcud_minrec);
1424 CWARN("Could not determine changelog records to purge; rc=%d\n",
1428 llog_ctxt_put(ctxt);
1430 if (!data.mcud_found) {
1431 CWARN("No entry for user %d. Last changelog reference is "
1432 LPD64" by changelog user %d\n", data.mcud_id,
1433 data.mcud_minrec, data.mcud_minid);
1437 if (!rc && data.mcud_usercount == 0)
1438 /* No more users; turn changelogs off */
1439 rc = mdd_changelog_on(env, mdd, 0);
1445 * May be called remotely from mdt_iocontrol_handle or locally from
1446 * mdt_iocontrol. Data may be freeform - remote handling doesn't enforce
1447 * an obd_ioctl_data format (but local ioctl handler does).
1449 * \param len - data len
1450 * \param karg - ioctl data, in kernel space
1452 static int mdd_iocontrol(const struct lu_env *env, struct md_device *m,
1453 unsigned int cmd, int len, void *karg)
1455 struct mdd_device *mdd;
1456 struct obd_ioctl_data *data = karg;
1460 mdd = lu2mdd_dev(&m->md_lu_dev);
1462 /* Doesn't use obd_ioctl_data */
1464 case OBD_IOC_CHANGELOG_CLEAR: {
1465 struct changelog_setinfo *cs = karg;
1466 rc = mdd_changelog_user_purge(env, mdd, cs->cs_id,
1470 case OBD_IOC_GET_MNTOPT: {
1471 mntopt_t *mntopts = (mntopt_t *)karg;
1472 *mntopts = mdd->mdd_dt_conf.ddp_mntopts;
1475 case OBD_IOC_START_LFSCK: {
1476 rc = lfsck_start(env, mdd->mdd_bottom,
1477 (struct lfsck_start_param *)karg);
1480 case OBD_IOC_STOP_LFSCK: {
1481 rc = lfsck_stop(env, mdd->mdd_bottom,
1482 (struct lfsck_stop *)karg);
1487 /* Below ioctls use obd_ioctl_data */
1488 if (len != sizeof(*data)) {
1489 CERROR("Bad ioctl size %d\n", len);
1492 if (data->ioc_version != OBD_IOCTL_VERSION) {
1493 CERROR("Bad magic %x != %x\n", data->ioc_version,
1499 case OBD_IOC_CHANGELOG_REG:
1500 rc = mdd_changelog_user_register(env, mdd, &data->ioc_u32_1);
1502 case OBD_IOC_CHANGELOG_DEREG:
1503 rc = mdd_changelog_user_purge(env, mdd, data->ioc_u32_1,
1513 /* type constructor/destructor: mdd_type_init, mdd_type_fini */
1514 LU_TYPE_INIT_FINI(mdd, &mdd_thread_key);
1516 const struct md_device_operations mdd_ops = {
1517 .mdo_statfs = mdd_statfs,
1518 .mdo_root_get = mdd_root_get,
1519 .mdo_init_capa_ctxt = mdd_init_capa_ctxt,
1520 .mdo_update_capa_key= mdd_update_capa_key,
1521 .mdo_llog_ctxt_get = mdd_llog_ctxt_get,
1522 .mdo_iocontrol = mdd_iocontrol,
1523 .mdo_maxeasize_get = mdd_maxeasize_get,
1526 static struct lu_device_type_operations mdd_device_type_ops = {
1527 .ldto_init = mdd_type_init,
1528 .ldto_fini = mdd_type_fini,
1530 .ldto_start = mdd_type_start,
1531 .ldto_stop = mdd_type_stop,
1533 .ldto_device_alloc = mdd_device_alloc,
1534 .ldto_device_free = mdd_device_free,
1536 .ldto_device_fini = mdd_device_fini
1539 static struct lu_device_type mdd_device_type = {
1540 .ldt_tags = LU_DEVICE_MD,
1541 .ldt_name = LUSTRE_MDD_NAME,
1542 .ldt_ops = &mdd_device_type_ops,
1543 .ldt_ctx_tags = LCT_MD_THREAD
1546 /* context key constructor: mdd_key_init */
1547 LU_KEY_INIT(mdd, struct mdd_thread_info);
1549 static void mdd_key_fini(const struct lu_context *ctx,
1550 struct lu_context_key *key, void *data)
1552 struct mdd_thread_info *info = data;
1554 lu_buf_free(&info->mti_big_buf);
1555 lu_buf_free(&info->mti_link_buf);
1560 /* context key: mdd_thread_key */
1561 LU_CONTEXT_KEY_DEFINE(mdd, LCT_MD_THREAD);
1563 static int __init mdd_mod_init(void)
1565 struct lprocfs_static_vars lvars;
1568 lprocfs_mdd_init_vars(&lvars);
1570 rc = lu_kmem_init(mdd_caches);
1574 changelog_orig_logops = llog_osd_ops;
1575 changelog_orig_logops.lop_cancel = llog_changelog_cancel;
1576 changelog_orig_logops.lop_add = llog_cat_add_rec;
1577 changelog_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1579 hsm_actions_logops = llog_osd_ops;
1580 hsm_actions_logops.lop_add = llog_cat_add_rec;
1581 hsm_actions_logops.lop_declare_add = llog_cat_declare_add_rec;
1583 rc = class_register_type(&mdd_obd_device_ops, NULL, NULL,
1584 #ifndef HAVE_ONLY_PROCFS_SEQ
1587 LUSTRE_MDD_NAME, &mdd_device_type);
1589 lu_kmem_fini(mdd_caches);
1593 static void __exit mdd_mod_exit(void)
1595 class_unregister_type(LUSTRE_MDD_NAME);
1596 lu_kmem_fini(mdd_caches);
1599 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1600 MODULE_DESCRIPTION("Lustre Meta-data Device Prototype ("LUSTRE_MDD_NAME")");
1601 MODULE_LICENSE("GPL");
1603 cfs_module(mdd, "0.1.0", mdd_mod_init, mdd_mod_exit);