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);
155 lu_dev_del_linkage(d->ld_site, d);
157 rc = mdd_procfs_fini(mdd);
159 CERROR("proc fini error %d \n", rc);
165 static int changelog_init_cb(const struct lu_env *env, struct llog_handle *llh,
166 struct llog_rec_hdr *hdr, void *data)
168 struct mdd_device *mdd = (struct mdd_device *)data;
169 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
171 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
172 LASSERT(rec->cr_hdr.lrh_type == CHANGELOG_REC);
175 "seeing record at index %d/%d/"LPU64" t=%x %.*s in log"
176 DOSTID"\n", hdr->lrh_index, rec->cr_hdr.lrh_index,
177 rec->cr.cr_index, rec->cr.cr_type, rec->cr.cr_namelen,
178 rec->cr.cr_name, POSTID(&llh->lgh_id.lgl_oi));
180 mdd->mdd_cl.mc_index = rec->cr.cr_index;
181 return LLOG_PROC_BREAK;
184 static int changelog_user_init_cb(const struct lu_env *env,
185 struct llog_handle *llh,
186 struct llog_rec_hdr *hdr, void *data)
188 struct mdd_device *mdd = (struct mdd_device *)data;
189 struct llog_changelog_user_rec *rec =
190 (struct llog_changelog_user_rec *)hdr;
192 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
193 LASSERT(rec->cur_hdr.lrh_type == CHANGELOG_USER_REC);
195 CDEBUG(D_INFO, "seeing user at index %d/%d id=%d endrec="LPU64
196 " in log "DOSTID"\n", hdr->lrh_index, rec->cur_hdr.lrh_index,
197 rec->cur_id, rec->cur_endrec, POSTID(&llh->lgh_id.lgl_oi));
199 spin_lock(&mdd->mdd_cl.mc_user_lock);
200 mdd->mdd_cl.mc_lastuser = rec->cur_id;
201 if (rec->cur_endrec > mdd->mdd_cl.mc_index)
202 mdd->mdd_cl.mc_index = rec->cur_endrec;
203 spin_unlock(&mdd->mdd_cl.mc_user_lock);
205 return LLOG_PROC_BREAK;
208 static int llog_changelog_cancel_cb(const struct lu_env *env,
209 struct llog_handle *llh,
210 struct llog_rec_hdr *hdr, void *data)
212 struct llog_changelog_rec *rec = (struct llog_changelog_rec *)hdr;
213 struct llog_cookie cookie;
214 long long endrec = *(long long *)data;
219 /* This is always a (sub)log, not the catalog */
220 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
222 if (rec->cr.cr_index > endrec)
223 /* records are in order, so we're done */
224 RETURN(LLOG_PROC_BREAK);
226 cookie.lgc_lgl = llh->lgh_id;
227 cookie.lgc_index = hdr->lrh_index;
229 /* cancel them one at a time. I suppose we could store up the cookies
230 * and cancel them all at once; probably more efficient, but this is
231 * done as a user call, so who cares... */
232 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle, 1,
234 RETURN(rc < 0 ? rc : 0);
237 static int llog_changelog_cancel(const struct lu_env *env,
238 struct llog_ctxt *ctxt,
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;
265 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on);
267 static int mdd_changelog_llog_init(const struct lu_env *env,
268 struct mdd_device *mdd)
270 struct obd_device *obd = mdd2obd_dev(mdd);
271 struct llog_ctxt *ctxt = NULL, *uctxt = NULL;
276 /* LU-2844 mdd setup failure should not cause umount oops */
277 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CHANGELOG_INIT))
280 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
281 obd->obd_lvfs_ctxt.dt = mdd->mdd_bottom;
282 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_ORIG_CTXT,
283 obd, &changelog_orig_logops);
285 CERROR("%s: changelog llog setup failed: rc = %d\n",
290 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
293 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
296 GOTO(out_cleanup, rc);
298 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
302 rc = llog_cat_reverse_process(env, ctxt->loc_handle,
303 changelog_init_cb, mdd);
306 CERROR("%s: changelog init failed: rc = %d\n", obd->obd_name,
311 CDEBUG(D_IOCTL, "changelog starting index="LPU64"\n",
312 mdd->mdd_cl.mc_index);
314 /* setup user changelog */
315 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CHANGELOG_USER_ORIG_CTXT,
316 obd, &changelog_orig_logops);
318 CERROR("%s: changelog users llog setup failed: rc = %d\n",
323 uctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
326 rc = llog_open_create(env, uctxt, &uctxt->loc_handle, NULL,
329 GOTO(out_ucleanup, rc);
331 uctxt->loc_handle->lgh_logops->lop_add = llog_cat_add_rec;
332 uctxt->loc_handle->lgh_logops->lop_declare_add = llog_cat_declare_add_rec;
334 rc = llog_cat_init_and_process(env, uctxt->loc_handle);
336 GOTO(out_uclose, rc);
338 rc = llog_cat_reverse_process(env, uctxt->loc_handle,
339 changelog_user_init_cb, mdd);
341 CERROR("%s: changelog user init failed: rc = %d\n",
343 GOTO(out_uclose, rc);
346 /* If we have registered users, assume we want changelogs on */
347 if (mdd->mdd_cl.mc_lastuser > 0) {
348 rc = mdd_changelog_on(env, mdd, 1);
350 GOTO(out_uclose, rc);
353 llog_ctxt_put(uctxt);
356 llog_cat_close(env, uctxt->loc_handle);
358 llog_cleanup(env, uctxt);
360 llog_cat_close(env, ctxt->loc_handle);
362 llog_cleanup(env, ctxt);
366 static int mdd_changelog_init(const struct lu_env *env, struct mdd_device *mdd)
368 struct obd_device *obd = mdd2obd_dev(mdd);
371 mdd->mdd_cl.mc_index = 0;
372 spin_lock_init(&mdd->mdd_cl.mc_lock);
373 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
374 mdd->mdd_cl.mc_flags = 0; /* off by default */
375 mdd->mdd_cl.mc_mask = CHANGELOG_DEFMASK;
376 spin_lock_init(&mdd->mdd_cl.mc_user_lock);
377 mdd->mdd_cl.mc_lastuser = 0;
379 rc = mdd_changelog_llog_init(env, mdd);
381 CERROR("%s: changelog setup during init failed: rc = %d\n",
383 mdd->mdd_cl.mc_flags |= CLM_ERR;
389 static void mdd_changelog_fini(const struct lu_env *env,
390 struct mdd_device *mdd)
392 struct obd_device *obd = mdd2obd_dev(mdd);
393 struct llog_ctxt *ctxt;
395 mdd->mdd_cl.mc_flags = 0;
397 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
399 llog_cat_close(env, ctxt->loc_handle);
400 llog_cleanup(env, ctxt);
402 ctxt = llog_get_context(obd, LLOG_CHANGELOG_USER_ORIG_CTXT);
404 llog_cat_close(env, ctxt->loc_handle);
405 llog_cleanup(env, ctxt);
410 mdd_changelog_write_header(const struct lu_env *env, struct mdd_device *mdd,
413 /* Start / stop recording */
415 mdd_changelog_on(const struct lu_env *env, struct mdd_device *mdd, int on)
419 if ((on == 1) && ((mdd->mdd_cl.mc_flags & CLM_ON) == 0)) {
420 LCONSOLE_INFO("%s: changelog on\n", mdd2obd_dev(mdd)->obd_name);
421 if (mdd->mdd_cl.mc_flags & CLM_ERR) {
422 CERROR("Changelogs cannot be enabled due to error "
423 "condition (see %s log).\n",
424 mdd2obd_dev(mdd)->obd_name);
427 spin_lock(&mdd->mdd_cl.mc_lock);
428 mdd->mdd_cl.mc_flags |= CLM_ON;
429 spin_unlock(&mdd->mdd_cl.mc_lock);
430 rc = mdd_changelog_write_header(env, mdd, CLM_START);
432 } else if ((on == 0) && ((mdd->mdd_cl.mc_flags & CLM_ON) == CLM_ON)) {
433 LCONSOLE_INFO("%s: changelog off\n",mdd2obd_dev(mdd)->obd_name);
434 rc = mdd_changelog_write_header(env, mdd, CLM_FINI);
435 spin_lock(&mdd->mdd_cl.mc_lock);
436 mdd->mdd_cl.mc_flags &= ~CLM_ON;
437 spin_unlock(&mdd->mdd_cl.mc_lock);
442 /** Remove entries with indicies up to and including \a endrec from the
449 mdd_changelog_llog_cancel(const struct lu_env *env, struct mdd_device *mdd,
452 struct obd_device *obd = mdd2obd_dev(mdd);
453 struct llog_ctxt *ctxt;
454 long long unsigned cur;
457 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
461 spin_lock(&mdd->mdd_cl.mc_lock);
462 cur = (long long)mdd->mdd_cl.mc_index;
463 spin_unlock(&mdd->mdd_cl.mc_lock);
467 /* purge to "0" is shorthand for everything */
471 /* If purging all records, write a header entry so we don't have an
472 empty catalog and we're sure to have a valid starting index next
473 time. In case of crash, we just restart with old log so we're
476 /* XXX: transaction is started by llog itself */
477 rc = mdd_changelog_write_header(env, mdd, CLM_PURGE);
482 /* Some records were purged, so reset repeat-access time (so we
483 record new mtime update records, so users can see a file has been
484 changed since the last purge) */
485 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
487 rc = llog_cancel(env, ctxt, (struct llog_cookie *)&endrec, 0);
493 /** Add a CL_MARK record to the changelog
495 * \param markerflags - CLM_*
498 int mdd_changelog_write_header(const struct lu_env *env,
499 struct mdd_device *mdd, int markerflags)
501 struct obd_device *obd = mdd2obd_dev(mdd);
502 struct llog_changelog_rec *rec;
504 struct llog_ctxt *ctxt;
506 int len = strlen(obd->obd_name);
511 if (mdd->mdd_cl.mc_mask & (1 << CL_MARK)) {
512 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
516 reclen = llog_data_len(sizeof(*rec) + len);
517 buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
518 if (buf->lb_buf == NULL)
522 rec->cr.cr_flags = CLF_VERSION;
523 rec->cr.cr_type = CL_MARK;
524 rec->cr.cr_namelen = len;
525 memcpy(rec->cr.cr_name, obd->obd_name, rec->cr.cr_namelen);
526 /* Status and action flags */
527 rec->cr.cr_markerflags = mdd->mdd_cl.mc_flags | markerflags;
528 rec->cr_hdr.lrh_len = llog_data_len(sizeof(*rec) + rec->cr.cr_namelen);
529 rec->cr_hdr.lrh_type = CHANGELOG_REC;
530 rec->cr.cr_time = cl_time();
531 spin_lock(&mdd->mdd_cl.mc_lock);
532 rec->cr.cr_index = ++mdd->mdd_cl.mc_index;
533 spin_unlock(&mdd->mdd_cl.mc_lock);
535 ctxt = llog_get_context(obd, LLOG_CHANGELOG_ORIG_CTXT);
538 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cr_hdr, NULL);
543 /* assume on or off event; reset repeat-access time */
544 mdd->mdd_cl.mc_starttime = cfs_time_current_64();
549 * Lookup method for "fid" object. Only filenames with correct SEQ:OID format
550 * are valid. We also check if object with passed fid exists or not.
552 static int obf_lookup(const struct lu_env *env, struct md_object *p,
553 const struct lu_name *lname, struct lu_fid *f,
554 struct md_op_spec *spec)
556 char *name = (char *)lname->ln_name;
557 struct mdd_device *mdd = mdo2mdd(p);
558 struct mdd_object *child;
564 sscanf(name, SFID, RFID(f));
565 if (!fid_is_sane(f)) {
566 CWARN("%s: Trying to lookup invalid FID [%s] in %s/%s, FID "
567 "format should be "DFID"\n", mdd2obd_dev(mdd)->obd_name,
568 lname->ln_name, dot_lustre_name, mdd_obf_dir_name,
569 (__u64)FID_SEQ_NORMAL, 1, 0);
570 GOTO(out, rc = -EINVAL);
573 if (!fid_is_norm(f) && !fid_is_igif(f) && !fid_is_root(f) &&
574 !fid_seq_is_dot(f->f_seq)) {
575 CWARN("%s: Trying to lookup invalid FID "DFID" in %s/%s, "
576 "sequence should be >= "LPX64" or within ["LPX64","
577 ""LPX64"].\n", mdd2obd_dev(mdd)->obd_name, PFID(f),
578 dot_lustre_name, mdd_obf_dir_name, (__u64)FID_SEQ_NORMAL,
579 (__u64)FID_SEQ_IGIF, (__u64)FID_SEQ_IGIF_MAX);
580 GOTO(out, rc = -EINVAL);
583 /* Check if object with this fid exists */
584 child = mdd_object_find(env, mdd, f);
588 GOTO(out, rc = PTR_ERR(child));
590 if (mdd_object_exists(child) == 0)
593 mdd_object_put(env, child);
599 static int mdd_dummy_create(const struct lu_env *env,
600 struct md_object *pobj,
601 const struct lu_name *lname,
602 struct md_object *child,
603 struct md_op_spec *spec,
609 static int mdd_dummy_rename(const struct lu_env *env,
610 struct md_object *src_pobj,
611 struct md_object *tgt_pobj,
612 const struct lu_fid *lf,
613 const struct lu_name *lsname,
614 struct md_object *tobj,
615 const struct lu_name *ltname,
621 static int mdd_dummy_link(const struct lu_env *env,
622 struct md_object *tgt_obj,
623 struct md_object *src_obj,
624 const struct lu_name *lname,
630 static int mdd_dummy_unlink(const struct lu_env *env,
631 struct md_object *pobj,
632 struct md_object *cobj,
633 const struct lu_name *lname,
640 static struct md_dir_operations mdd_obf_dir_ops = {
641 .mdo_lookup = obf_lookup,
642 .mdo_create = mdd_dummy_create,
643 .mdo_rename = mdd_dummy_rename,
644 .mdo_link = mdd_dummy_link,
645 .mdo_unlink = mdd_dummy_unlink
648 static struct md_dir_operations mdd_lpf_dir_ops = {
649 .mdo_lookup = mdd_lookup,
650 .mdo_create = mdd_dummy_create,
651 .mdo_rename = mdd_dummy_rename,
652 .mdo_link = mdd_dummy_link,
653 .mdo_unlink = mdd_dummy_unlink
656 static struct md_object *mdo_locate(const struct lu_env *env,
657 struct md_device *md,
658 const struct lu_fid *fid)
660 struct lu_object *obj;
661 struct md_object *mdo;
663 obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
665 obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
666 LASSERT(obj != NULL);
669 mdo = ERR_PTR(PTR_ERR(obj));
674 static int mdd_lpf_setup(const struct lu_env *env, struct mdd_device *m)
676 struct md_object *mdo;
677 struct mdd_object *mdd_lpf;
678 struct lu_fid fid = LU_LPF_FID;
682 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
683 mdd_lpf_dir_name, S_IFDIR | S_IRUSR | S_IXUSR,
688 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
690 RETURN(PTR_ERR(mdo));
692 LASSERT(lu_object_exists(&mdo->mo_lu));
694 mdd_lpf = md2mdd_obj(mdo);
695 mdd_lpf->mod_obj.mo_dir_ops = &mdd_lpf_dir_ops;
696 m->mdd_dot_lustre_objs.mdd_lpf = mdd_lpf;
702 * Create special in-memory "fid" object for open-by-fid.
704 static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
706 struct md_object *mdo;
707 struct mdd_object *mdd_obf;
708 struct lu_fid fid = LU_OBF_FID;
711 rc = mdd_local_file_create(env, m, mdd_object_fid(m->mdd_dot_lustre),
712 mdd_obf_dir_name, S_IFDIR | S_IXUSR, &fid);
716 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
718 RETURN(PTR_ERR(mdo));
720 LASSERT(lu_object_exists(&mdo->mo_lu));
722 mdd_obf = md2mdd_obj(mdo);
723 mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
724 m->mdd_dot_lustre_objs.mdd_obf = mdd_obf;
729 static void mdd_dot_lustre_cleanup(const struct lu_env *env,
730 struct mdd_device *m)
732 if (m->mdd_dot_lustre_objs.mdd_lpf != NULL) {
733 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_lpf);
734 m->mdd_dot_lustre_objs.mdd_lpf = NULL;
736 if (m->mdd_dot_lustre_objs.mdd_obf != NULL) {
737 mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
738 m->mdd_dot_lustre_objs.mdd_obf = NULL;
740 if (m->mdd_dot_lustre != NULL) {
741 mdd_object_put(env, m->mdd_dot_lustre);
742 m->mdd_dot_lustre = NULL;
746 /** Setup ".lustre" directory object */
747 static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
749 struct md_object *mdo;
754 /* Create ".lustre" directory in ROOT. */
755 fid = LU_DOT_LUSTRE_FID;
756 rc = mdd_local_file_create(env, m, &m->mdd_root_fid,
758 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO,
762 mdo = mdo_locate(env, &m->mdd_md_dev, &fid);
764 RETURN(PTR_ERR(mdo));
765 LASSERT(lu_object_exists(&mdo->mo_lu));
767 m->mdd_dot_lustre = md2mdd_obj(mdo);
769 rc = mdd_obf_setup(env, m);
771 CERROR("%s: error initializing \"fid\" object: rc = %d.\n",
772 mdd2obd_dev(m)->obd_name, rc);
776 rc = mdd_lpf_setup(env, m);
778 CERROR("%s: error initializing \"lost+found\": rc = %d.\n",
779 mdd2obd_dev(m)->obd_name, rc);
786 mdd_dot_lustre_cleanup(env, m);
792 static struct llog_operations hsm_actions_logops;
795 * set llog methods and create LLOG_AGENT_ORIG_CTXT llog
796 * object in obd_device
798 static int mdd_hsm_actions_llog_init(const struct lu_env *env,
799 struct mdd_device *m)
801 struct obd_device *obd = mdd2obd_dev(m);
802 struct llog_ctxt *ctxt = NULL;
806 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
807 obd->obd_lvfs_ctxt.dt = m->mdd_bottom;
809 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_AGENT_ORIG_CTXT,
810 obd, &hsm_actions_logops);
812 CERROR("%s: hsm actions llog setup failed: rc = %d\n",
817 ctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
820 rc = llog_open_create(env, ctxt, &ctxt->loc_handle, NULL,
823 CERROR("%s: hsm actions llog open_create failed: rc = %d\n",
825 GOTO(out_cleanup, rc);
828 rc = llog_cat_init_and_process(env, ctxt->loc_handle);
836 llog_cat_close(env, ctxt->loc_handle);
837 ctxt->loc_handle = NULL;
839 llog_cleanup(env, ctxt);
845 * cleanup the context created by llog_setup_named()
847 static int mdd_hsm_actions_llog_fini(const struct lu_env *env,
848 struct mdd_device *m)
850 struct obd_device *obd = mdd2obd_dev(m);
851 struct llog_ctxt *lctxt;
854 lctxt = llog_get_context(obd, LLOG_AGENT_ORIG_CTXT);
856 llog_cat_close(env, lctxt->loc_handle);
857 lctxt->loc_handle = NULL;
858 llog_cleanup(env, lctxt);
864 static void mdd_device_shutdown(const struct lu_env *env, struct mdd_device *m,
865 struct lustre_cfg *cfg)
867 lfsck_degister(env, m->mdd_bottom);
868 mdd_hsm_actions_llog_fini(env, m);
869 mdd_changelog_fini(env, m);
870 orph_index_fini(env, m);
871 mdd_dot_lustre_cleanup(env, m);
872 if (m->mdd_los != NULL) {
873 local_oid_storage_fini(env, m->mdd_los);
876 lu_site_purge(env, mdd2lu_dev(m)->ld_site, ~0);
878 if (m->mdd_child_exp)
879 obd_disconnect(m->mdd_child_exp);
882 static int mdd_process_config(const struct lu_env *env,
883 struct lu_device *d, struct lustre_cfg *cfg)
885 struct mdd_device *m = lu2mdd_dev(d);
886 struct dt_device *dt = m->mdd_child;
887 struct lu_device *next = &dt->dd_lu_dev;
891 switch (cfg->lcfg_command) {
893 struct lprocfs_static_vars lvars;
895 lprocfs_mdd_init_vars(&lvars);
896 rc = class_process_proc_param(PARAM_MDD, lvars.obd_vars, cfg,m);
897 if (rc > 0 || rc == -ENOSYS)
898 /* we don't understand; pass it on */
899 rc = next->ld_ops->ldo_process_config(env, next, cfg);
903 rc = next->ld_ops->ldo_process_config(env, next, cfg);
906 dt_conf_get(env, dt, &m->mdd_dt_conf);
909 rc = next->ld_ops->ldo_process_config(env, next, cfg);
910 lu_dev_del_linkage(d->ld_site, d);
911 mdd_device_shutdown(env, m, cfg);
914 rc = next->ld_ops->ldo_process_config(env, next, cfg);
921 static int mdd_recovery_complete(const struct lu_env *env,
924 struct mdd_device *mdd = lu2mdd_dev(d);
925 struct lu_device *next;
929 LASSERT(mdd != NULL);
930 next = &mdd->mdd_child->dd_lu_dev;
932 /* XXX: orphans handling. */
933 __mdd_orphan_cleanup(env, mdd);
934 rc = next->ld_ops->ldo_recovery_complete(env, next);
939 int mdd_local_file_create(const struct lu_env *env, struct mdd_device *mdd,
940 const struct lu_fid *pfid, const char *name, __u32 mode,
943 struct dt_object *parent, *dto;
948 LASSERT(!fid_is_zero(pfid));
949 parent = dt_locate(env, mdd->mdd_bottom, pfid);
950 if (unlikely(IS_ERR(parent)))
951 RETURN(PTR_ERR(parent));
953 /* create local file/dir, if @fid is passed then try to use it */
954 if (fid_is_zero(fid))
955 dto = local_file_find_or_create(env, mdd->mdd_los, parent,
958 dto = local_file_find_or_create_with_fid(env, mdd->mdd_bottom,
962 GOTO(out_put, rc = PTR_ERR(dto));
963 *fid = *lu_object_fid(&dto->do_lu);
964 /* since stack is not fully set up the local_storage uses own stack
965 * and we should drop its object from cache */
966 lu_object_put_nocache(env, &dto->do_lu);
969 lu_object_put(env, &parent->do_lu);
973 static int mdd_lfsck_out_notify(const struct lu_env *env, void *data,
974 enum lfsck_events event)
979 static int mdd_prepare(const struct lu_env *env,
980 struct lu_device *pdev,
981 struct lu_device *cdev)
983 struct mdd_device *mdd = lu2mdd_dev(cdev);
984 struct lu_device *next = &mdd->mdd_child->dd_lu_dev;
990 rc = next->ld_ops->ldo_prepare(env, cdev, next);
994 /* Setup local dirs */
995 fid.f_seq = FID_SEQ_LOCAL_NAME;
998 rc = local_oid_storage_init(env, mdd->mdd_bottom, &fid,
1003 rc = dt_root_get(env, mdd->mdd_child, &mdd->mdd_local_root_fid);
1008 if (mdd_seq_site(mdd)->ss_node_id == 0) {
1009 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
1010 mdd_root_dir_name, S_IFDIR |
1011 S_IRUGO | S_IWUSR | S_IXUGO, &fid);
1013 CERROR("%s: create root fid failed: rc = %d\n",
1014 mdd2obd_dev(mdd)->obd_name, rc);
1018 mdd->mdd_root_fid = fid;
1019 rc = mdd_dot_lustre_setup(env, mdd);
1021 CERROR("%s: initializing .lustre failed: rc = %d\n",
1022 mdd2obd_dev(mdd)->obd_name, rc);
1026 rc = mdd_compat_fixes(env, mdd);
1030 /* Normal client usually send root access to MDT0 directly,
1031 * the root FID on non-MDT0 will only be used by echo client. */
1032 mdd->mdd_root_fid = fid;
1035 rc = orph_index_init(env, mdd);
1039 rc = mdd_changelog_init(env, mdd);
1041 CERROR("%s: failed to initialize changelog: rc = %d\n",
1042 mdd2obd_dev(mdd)->obd_name, rc);
1046 rc = mdd_hsm_actions_llog_init(env, mdd);
1048 GOTO(out_changelog, rc);
1050 rc = lfsck_register(env, mdd->mdd_bottom, mdd->mdd_child,
1051 mdd2obd_dev(mdd), mdd_lfsck_out_notify,
1054 CERROR("%s: failed to initialize lfsck: rc = %d\n",
1055 mdd2obd_dev(mdd)->obd_name, rc);
1060 mdd_hsm_actions_llog_fini(env, mdd);
1062 mdd_changelog_fini(env, mdd);
1064 orph_index_fini(env, mdd);
1066 if (mdd_seq_site(mdd)->ss_node_id == 0)
1067 mdd_dot_lustre_cleanup(env, mdd);
1069 local_oid_storage_fini(env, mdd->mdd_los);
1070 mdd->mdd_los = NULL;
1075 const struct lu_device_operations mdd_lu_ops = {
1076 .ldo_object_alloc = mdd_object_alloc,
1077 .ldo_process_config = mdd_process_config,
1078 .ldo_recovery_complete = mdd_recovery_complete,
1079 .ldo_prepare = mdd_prepare,
1082 static int mdd_root_get(const struct lu_env *env,
1083 struct md_device *m, struct lu_fid *f)
1085 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1088 *f = mdd->mdd_root_fid;
1093 * No permission check is needed.
1095 static int mdd_statfs(const struct lu_env *env, struct md_device *m,
1096 struct obd_statfs *sfs)
1098 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1103 rc = mdd_child_ops(mdd)->dt_statfs(env, mdd->mdd_child, sfs);
1105 sfs->os_namelen = min_t(__u32, sfs->os_namelen, NAME_MAX);
1111 * No permission check is needed.
1113 static int mdd_init_capa_ctxt(const struct lu_env *env, struct md_device *m,
1114 int mode, unsigned long timeout, __u32 alg,
1115 struct lustre_capa_key *keys)
1117 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1121 /* need barrier for mds_capa_keys access. */
1123 rc = mdd_child_ops(mdd)->dt_init_capa_ctxt(env, mdd->mdd_child, mode,
1124 timeout, alg, keys);
1128 static int mdd_maxeasize_get(const struct lu_env *env, struct md_device *m,
1131 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1134 *easize = mdd->mdd_dt_conf.ddp_max_ea_size;
1139 static int mdd_update_capa_key(const struct lu_env *env,
1140 struct md_device *m,
1141 struct lustre_capa_key *key)
1143 /* we do not support capabilities ... */
1147 static int mdd_llog_ctxt_get(const struct lu_env *env, struct md_device *m,
1150 struct mdd_device *mdd = lu2mdd_dev(&m->md_lu_dev);
1152 *h = llog_group_get_ctxt(&mdd2obd_dev(mdd)->obd_olg, idx);
1153 return (*h == NULL ? -ENOENT : 0);
1156 static struct lu_device *mdd_device_free(const struct lu_env *env,
1157 struct lu_device *lu)
1159 struct mdd_device *m = lu2mdd_dev(lu);
1162 LASSERT(atomic_read(&lu->ld_ref) == 0);
1163 md_device_fini(&m->mdd_md_dev);
1168 static struct lu_device *mdd_device_alloc(const struct lu_env *env,
1169 struct lu_device_type *t,
1170 struct lustre_cfg *lcfg)
1172 struct lu_device *l;
1173 struct mdd_device *m;
1177 l = ERR_PTR(-ENOMEM);
1182 md_device_init(&m->mdd_md_dev, t);
1183 rc = mdd_init0(env, m, t, lcfg);
1185 mdd_device_free(env, l);
1194 * we use exports to track all mdd users
1196 static int mdd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1197 struct obd_device *obd, struct obd_uuid *cluuid,
1198 struct obd_connect_data *data, void *localdata)
1200 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1201 struct lustre_handle conn;
1205 CDEBUG(D_CONFIG, "connect #%d\n", mdd->mdd_connects);
1207 rc = class_connect(&conn, obd, cluuid);
1211 *exp = class_conn2export(&conn);
1213 /* Why should there ever be more than 1 connect? */
1214 LASSERT(mdd->mdd_connects == 0);
1215 mdd->mdd_connects++;
1221 * once last export (we don't count self-export) disappeared
1222 * mdd can be released
1224 static int mdd_obd_disconnect(struct obd_export *exp)
1226 struct obd_device *obd = exp->exp_obd;
1227 struct mdd_device *mdd = lu2mdd_dev(obd->obd_lu_dev);
1228 int rc, release = 0;
1231 mdd->mdd_connects--;
1232 if (mdd->mdd_connects == 0)
1235 rc = class_disconnect(exp);
1237 if (rc == 0 && release)
1238 class_manual_cleanup(obd);
1242 static int mdd_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1243 __u32 keylen, void *key, __u32 *vallen, void *val,
1244 struct lov_stripe_md *lsm)
1248 if (KEY_IS(KEY_OSP_CONNECTED)) {
1249 struct obd_device *obd = exp->exp_obd;
1250 struct mdd_device *mdd;
1252 if (!obd->obd_set_up || obd->obd_stopping)
1255 mdd = lu2mdd_dev(obd->obd_lu_dev);
1257 rc = obd_get_info(env, mdd->mdd_child_exp, keylen, key, vallen,
1265 static struct obd_ops mdd_obd_device_ops = {
1266 .o_owner = THIS_MODULE,
1267 .o_connect = mdd_obd_connect,
1268 .o_disconnect = mdd_obd_disconnect,
1269 .o_get_info = mdd_obd_get_info,
1272 static int mdd_changelog_user_register(const struct lu_env *env,
1273 struct mdd_device *mdd, int *id)
1275 struct llog_ctxt *ctxt;
1276 struct llog_changelog_user_rec *rec;
1280 ctxt = llog_get_context(mdd2obd_dev(mdd),
1281 LLOG_CHANGELOG_USER_ORIG_CTXT);
1287 llog_ctxt_put(ctxt);
1291 /* Assume we want it on since somebody registered */
1292 rc = mdd_changelog_on(env, mdd, 1);
1296 rec->cur_hdr.lrh_len = sizeof(*rec);
1297 rec->cur_hdr.lrh_type = CHANGELOG_USER_REC;
1298 spin_lock(&mdd->mdd_cl.mc_user_lock);
1299 if (mdd->mdd_cl.mc_lastuser == (unsigned int)(-1)) {
1300 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1301 CERROR("Maximum number of changelog users exceeded!\n");
1302 GOTO(out, rc = -EOVERFLOW);
1304 *id = rec->cur_id = ++mdd->mdd_cl.mc_lastuser;
1305 rec->cur_endrec = mdd->mdd_cl.mc_index;
1306 spin_unlock(&mdd->mdd_cl.mc_user_lock);
1308 rc = llog_cat_add(env, ctxt->loc_handle, &rec->cur_hdr, NULL);
1310 CDEBUG(D_IOCTL, "Registered changelog user %d\n", *id);
1313 llog_ctxt_put(ctxt);
1317 struct mdd_changelog_user_data {
1318 __u64 mcud_endrec; /**< purge record for this user */
1319 __u64 mcud_minrec; /**< lowest changelog recno still referenced */
1321 __u32 mcud_minid; /**< user id with lowest rec reference */
1322 __u32 mcud_usercount;
1323 unsigned int mcud_found:1;
1325 #define MCUD_UNREGISTER -1LL
1328 * 1. Find the smallest record everyone is willing to purge
1329 * 2. Update the last purgeable record for this user
1331 static int mdd_changelog_user_purge_cb(const struct lu_env *env,
1332 struct llog_handle *llh,
1333 struct llog_rec_hdr *hdr, void *data)
1335 struct llog_changelog_user_rec *rec;
1336 struct mdd_changelog_user_data *mcud = data;
1341 LASSERT(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN);
1343 rec = (struct llog_changelog_user_rec *)hdr;
1345 mcud->mcud_usercount++;
1347 /* If we have a new endrec for this id, use it for the following
1348 min check instead of its old value */
1349 if (rec->cur_id == mcud->mcud_id)
1350 rec->cur_endrec = max(rec->cur_endrec, mcud->mcud_endrec);
1352 /* Track the minimum referenced record */
1353 if (mcud->mcud_minid == 0 || mcud->mcud_minrec > rec->cur_endrec) {
1354 mcud->mcud_minid = rec->cur_id;
1355 mcud->mcud_minrec = rec->cur_endrec;
1358 if (rec->cur_id != mcud->mcud_id)
1361 /* Update this user's record */
1362 mcud->mcud_found = 1;
1364 /* Special case: unregister this user */
1365 if (mcud->mcud_endrec == MCUD_UNREGISTER) {
1366 struct llog_cookie cookie;
1368 cookie.lgc_lgl = llh->lgh_id;
1369 cookie.lgc_index = hdr->lrh_index;
1371 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
1374 mcud->mcud_usercount--;
1379 /* Update the endrec */
1380 CDEBUG(D_IOCTL, "Rewriting changelog user %d endrec to "LPU64"\n",
1381 mcud->mcud_id, rec->cur_endrec);
1383 rc = llog_write(env, llh, hdr, hdr->lrh_index);
1388 static int mdd_changelog_user_purge(const struct lu_env *env,
1389 struct mdd_device *mdd, int id,
1392 struct mdd_changelog_user_data data;
1393 struct llog_ctxt *ctxt;
1397 CDEBUG(D_IOCTL, "Purge request: id=%d, endrec=%lld\n", id, endrec);
1400 data.mcud_minid = 0;
1401 data.mcud_minrec = 0;
1402 data.mcud_usercount = 0;
1403 data.mcud_endrec = endrec;
1404 spin_lock(&mdd->mdd_cl.mc_lock);
1405 endrec = mdd->mdd_cl.mc_index;
1406 spin_unlock(&mdd->mdd_cl.mc_lock);
1407 if ((data.mcud_endrec == 0) ||
1408 ((data.mcud_endrec > endrec) &&
1409 (data.mcud_endrec != MCUD_UNREGISTER)))
1410 data.mcud_endrec = endrec;
1412 ctxt = llog_get_context(mdd2obd_dev(mdd),
1413 LLOG_CHANGELOG_USER_ORIG_CTXT);
1417 LASSERT(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT);
1419 rc = llog_cat_process(env, ctxt->loc_handle,
1420 mdd_changelog_user_purge_cb, (void *)&data,
1422 if ((rc >= 0) && (data.mcud_minrec > 0)) {
1423 CDEBUG(D_IOCTL, "Purging changelog entries up to "LPD64
1424 ", referenced by "CHANGELOG_USER_PREFIX"%d\n",
1425 data.mcud_minrec, data.mcud_minid);
1426 rc = mdd_changelog_llog_cancel(env, mdd, data.mcud_minrec);
1428 CWARN("Could not determine changelog records to purge; rc=%d\n",
1432 llog_ctxt_put(ctxt);
1434 if (!data.mcud_found) {
1435 CWARN("No entry for user %d. Last changelog reference is "
1436 LPD64" by changelog user %d\n", data.mcud_id,
1437 data.mcud_minrec, data.mcud_minid);
1441 if (!rc && data.mcud_usercount == 0)
1442 /* No more users; turn changelogs off */
1443 rc = mdd_changelog_on(env, mdd, 0);
1449 * May be called remotely from mdt_iocontrol_handle or locally from
1450 * mdt_iocontrol. Data may be freeform - remote handling doesn't enforce
1451 * an obd_ioctl_data format (but local ioctl handler does).
1453 * \param len - data len
1454 * \param karg - ioctl data, in kernel space
1456 static int mdd_iocontrol(const struct lu_env *env, struct md_device *m,
1457 unsigned int cmd, int len, void *karg)
1459 struct mdd_device *mdd;
1460 struct obd_ioctl_data *data = karg;
1464 mdd = lu2mdd_dev(&m->md_lu_dev);
1466 /* Doesn't use obd_ioctl_data */
1468 case OBD_IOC_CHANGELOG_CLEAR: {
1469 struct changelog_setinfo *cs = karg;
1470 rc = mdd_changelog_user_purge(env, mdd, cs->cs_id,
1474 case OBD_IOC_GET_MNTOPT: {
1475 mntopt_t *mntopts = (mntopt_t *)karg;
1476 *mntopts = mdd->mdd_dt_conf.ddp_mntopts;
1479 case OBD_IOC_START_LFSCK: {
1480 rc = lfsck_start(env, mdd->mdd_bottom,
1481 (struct lfsck_start_param *)karg);
1484 case OBD_IOC_STOP_LFSCK: {
1485 rc = lfsck_stop(env, mdd->mdd_bottom,
1486 (struct lfsck_stop *)karg);
1491 /* Below ioctls use obd_ioctl_data */
1492 if (len != sizeof(*data)) {
1493 CERROR("Bad ioctl size %d\n", len);
1496 if (data->ioc_version != OBD_IOCTL_VERSION) {
1497 CERROR("Bad magic %x != %x\n", data->ioc_version,
1503 case OBD_IOC_CHANGELOG_REG:
1504 rc = mdd_changelog_user_register(env, mdd, &data->ioc_u32_1);
1506 case OBD_IOC_CHANGELOG_DEREG:
1507 rc = mdd_changelog_user_purge(env, mdd, data->ioc_u32_1,
1517 /* type constructor/destructor: mdd_type_init, mdd_type_fini */
1518 LU_TYPE_INIT_FINI(mdd, &mdd_thread_key);
1520 static const struct md_device_operations mdd_ops = {
1521 .mdo_statfs = mdd_statfs,
1522 .mdo_root_get = mdd_root_get,
1523 .mdo_init_capa_ctxt = mdd_init_capa_ctxt,
1524 .mdo_update_capa_key= mdd_update_capa_key,
1525 .mdo_llog_ctxt_get = mdd_llog_ctxt_get,
1526 .mdo_iocontrol = mdd_iocontrol,
1527 .mdo_maxeasize_get = mdd_maxeasize_get,
1530 static struct lu_device_type_operations mdd_device_type_ops = {
1531 .ldto_init = mdd_type_init,
1532 .ldto_fini = mdd_type_fini,
1534 .ldto_start = mdd_type_start,
1535 .ldto_stop = mdd_type_stop,
1537 .ldto_device_alloc = mdd_device_alloc,
1538 .ldto_device_free = mdd_device_free,
1540 .ldto_device_fini = mdd_device_fini
1543 static struct lu_device_type mdd_device_type = {
1544 .ldt_tags = LU_DEVICE_MD,
1545 .ldt_name = LUSTRE_MDD_NAME,
1546 .ldt_ops = &mdd_device_type_ops,
1547 .ldt_ctx_tags = LCT_MD_THREAD
1550 /* context key constructor: mdd_key_init */
1551 LU_KEY_INIT(mdd, struct mdd_thread_info);
1553 static void mdd_key_fini(const struct lu_context *ctx,
1554 struct lu_context_key *key, void *data)
1556 struct mdd_thread_info *info = data;
1558 lu_buf_free(&info->mti_big_buf);
1559 lu_buf_free(&info->mti_link_buf);
1564 /* context key: mdd_thread_key */
1565 LU_CONTEXT_KEY_DEFINE(mdd, LCT_MD_THREAD);
1567 static int __init mdd_mod_init(void)
1569 struct lprocfs_static_vars lvars;
1572 lprocfs_mdd_init_vars(&lvars);
1574 rc = lu_kmem_init(mdd_caches);
1578 changelog_orig_logops = llog_osd_ops;
1579 changelog_orig_logops.lop_cancel = llog_changelog_cancel;
1580 changelog_orig_logops.lop_add = llog_cat_add_rec;
1581 changelog_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1583 hsm_actions_logops = llog_osd_ops;
1584 hsm_actions_logops.lop_add = llog_cat_add_rec;
1585 hsm_actions_logops.lop_declare_add = llog_cat_declare_add_rec;
1587 rc = class_register_type(&mdd_obd_device_ops, NULL, true, NULL,
1588 #ifndef HAVE_ONLY_PROCFS_SEQ
1591 LUSTRE_MDD_NAME, &mdd_device_type);
1593 lu_kmem_fini(mdd_caches);
1597 static void __exit mdd_mod_exit(void)
1599 class_unregister_type(LUSTRE_MDD_NAME);
1600 lu_kmem_fini(mdd_caches);
1603 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1604 MODULE_DESCRIPTION("Lustre Meta-data Device Prototype ("LUSTRE_MDD_NAME")");
1605 MODULE_LICENSE("GPL");
1607 cfs_module(mdd, "0.1.0", mdd_mod_init, mdd_mod_exit);