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[fs/lustre-release.git] / lustre / lod / lod_lov.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.  A copy is
14  * included in the COPYING file that accompanied this code.
15  *
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.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright  2009 Sun Microsystems, Inc. All rights reserved
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2012, 2017, Intel Corporation.
27  */
28 /*
29  * lustre/lod/lod_lov.c
30  *
31  * A set of helpers to maintain Logical Object Volume (LOV)
32  * Extended Attribute (EA) and known OST targets
33  *
34  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
35  */
36
37 #define DEBUG_SUBSYSTEM S_MDS
38
39 #include <obd_class.h>
40 #include <lustre_lfsck.h>
41 #include <lustre_lmv.h>
42 #include <lustre_swab.h>
43
44 #include "lod_internal.h"
45
46 /**
47  * Increase reference count on the target table.
48  *
49  * Increase reference count on the target table usage to prevent racing with
50  * addition/deletion. Any function that expects the table to remain
51  * stationary must take a ref.
52  *
53  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
54  */
55 void lod_getref(struct lod_tgt_descs *ltd)
56 {
57         down_read(&ltd->ltd_rw_sem);
58         mutex_lock(&ltd->ltd_mutex);
59         ltd->ltd_refcount++;
60         mutex_unlock(&ltd->ltd_mutex);
61 }
62
63 /**
64  * Decrease reference count on the target table.
65  *
66  * Companion of lod_getref() to release a reference on the target table.
67  * If this is the last reference and the OST entry was scheduled for deletion,
68  * the descriptor is removed from the table.
69  *
70  * \param[in] lod       LOD device from which we release a reference
71  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
72  */
73 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
74 {
75         mutex_lock(&ltd->ltd_mutex);
76         ltd->ltd_refcount--;
77         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
78                 struct lod_tgt_desc *tgt_desc, *tmp;
79                 LIST_HEAD(kill);
80
81                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
82                        ltd->ltd_death_row);
83
84                 ltd_foreach_tgt_safe(ltd, tgt_desc, tmp) {
85                         LASSERT(tgt_desc);
86                         if (!tgt_desc->ltd_reap)
87                                 continue;
88
89                         list_add(&tgt_desc->ltd_kill, &kill);
90                         lod_tgt_pool_remove(&ltd->ltd_tgt_pool,
91                                             tgt_desc->ltd_index);
92                         ltd_del_tgt(ltd, tgt_desc);
93                         ltd->ltd_death_row--;
94                 }
95                 mutex_unlock(&ltd->ltd_mutex);
96                 up_read(&ltd->ltd_rw_sem);
97
98                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
99                         int rc;
100
101                         list_del(&tgt_desc->ltd_kill);
102                         rc = obd_disconnect(tgt_desc->ltd_exp);
103                         if (rc)
104                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
105                                        lod2obd(lod)->obd_name,
106                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
107                         OBD_FREE_PTR(tgt_desc);
108                 }
109         } else {
110                 mutex_unlock(&ltd->ltd_mutex);
111                 up_read(&ltd->ltd_rw_sem);
112         }
113 }
114
115 /**
116  * Connect LOD to a new OSP and add it to the target table.
117  *
118  * Connect to the OSP device passed, initialize all the internal
119  * structures related to the device and add it to the target table.
120  *
121  * \param[in] env               execution environment for this thread
122  * \param[in] lod               LOD device to be connected to the new OSP
123  * \param[in] osp               name of OSP device name to be added
124  * \param[in] index             index of the new target
125  * \param[in] gen               target's generation number
126  * \param[in] tgt_index         OSP's group
127  * \param[in] type              type of device (mdc or osc)
128  * \param[in] active            state of OSP: 0 - inactive, 1 - active
129  *
130  * \retval                      0 if added successfully
131  * \retval                      negative error number on failure
132  */
133 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
134                    char *osp, unsigned index, unsigned gen, int tgt_index,
135                    char *type, int active)
136 {
137         struct obd_connect_data *data = NULL;
138         struct obd_export       *exp = NULL;
139         struct obd_device       *obd;
140         struct lu_device        *lu_dev;
141         struct dt_device        *dt_dev;
142         int                      rc;
143         struct lod_tgt_desc     *tgt_desc;
144         struct lod_tgt_descs    *ltd;
145         struct lustre_cfg       *lcfg;
146         struct obd_uuid         obd_uuid;
147         bool                    for_ost;
148         bool connected = false;
149         ENTRY;
150
151         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
152
153         if (gen <= 0) {
154                 CERROR("request to add OBD %s with invalid generation: %d\n",
155                        osp, gen);
156                 RETURN(-EINVAL);
157         }
158
159         obd_str2uuid(&obd_uuid, osp);
160
161         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
162                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
163         if (obd == NULL) {
164                 CERROR("can't find %s device\n", osp);
165                 RETURN(-EINVAL);
166         }
167
168         LASSERT(obd->obd_lu_dev != NULL);
169         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
170
171         lu_dev = obd->obd_lu_dev;
172         dt_dev = lu2dt_dev(lu_dev);
173
174         OBD_ALLOC_PTR(data);
175         if (data == NULL)
176                 GOTO(out_cleanup, rc = -ENOMEM);
177
178         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
179         data->ocd_version = LUSTRE_VERSION_CODE;
180         data->ocd_index = index;
181
182         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
183                 for_ost = true;
184                 data->ocd_connect_flags |= OBD_CONNECT_AT |
185                                            OBD_CONNECT_FULL20 |
186                                            OBD_CONNECT_INDEX |
187 #ifdef HAVE_LRU_RESIZE_SUPPORT
188                                            OBD_CONNECT_LRU_RESIZE |
189 #endif
190                                            OBD_CONNECT_MDS |
191                                            OBD_CONNECT_REQPORTAL |
192                                            OBD_CONNECT_SKIP_ORPHAN |
193                                            OBD_CONNECT_FID |
194                                            OBD_CONNECT_LVB_TYPE |
195                                            OBD_CONNECT_VERSION |
196                                            OBD_CONNECT_PINGLESS |
197                                            OBD_CONNECT_LFSCK |
198                                            OBD_CONNECT_BULK_MBITS;
199
200                 data->ocd_group = tgt_index;
201                 ltd = &lod->lod_ost_descs;
202         } else {
203                 struct obd_import *imp = obd->u.cli.cl_import;
204
205                 for_ost = false;
206                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
207                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
208                                            OBD_CONNECT_IBITS |
209                                            OBD_CONNECT_MDS_MDS |
210                                            OBD_CONNECT_FID |
211                                            OBD_CONNECT_AT |
212                                            OBD_CONNECT_FULL20 |
213                                            OBD_CONNECT_LFSCK |
214                                            OBD_CONNECT_BULK_MBITS;
215                 spin_lock(&imp->imp_lock);
216                 imp->imp_server_timeout = 1;
217                 spin_unlock(&imp->imp_lock);
218                 imp->imp_client->cli_request_portal = OUT_PORTAL;
219                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
220                       obd->obd_name);
221                 ltd = &lod->lod_mdt_descs;
222         }
223
224         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
225         OBD_FREE_PTR(data);
226         if (rc) {
227                 CERROR("%s: cannot connect to next dev %s (%d)\n",
228                        obd->obd_name, osp, rc);
229                 GOTO(out_cleanup, rc);
230         }
231         connected = true;
232
233         /* Allocate ost descriptor and fill it */
234         OBD_ALLOC_PTR(tgt_desc);
235         if (!tgt_desc)
236                 GOTO(out_cleanup, rc = -ENOMEM);
237
238         tgt_desc->ltd_tgt    = dt_dev;
239         tgt_desc->ltd_exp    = exp;
240         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
241         tgt_desc->ltd_gen    = gen;
242         tgt_desc->ltd_index  = index;
243         tgt_desc->ltd_active = active;
244
245         down_write(&ltd->ltd_rw_sem);
246         mutex_lock(&ltd->ltd_mutex);
247         rc = ltd_add_tgt(ltd, tgt_desc);
248         if (rc)
249                 GOTO(out_mutex, rc);
250
251         rc = lu_qos_add_tgt(&ltd->ltd_qos, tgt_desc);
252         if (rc)
253                 GOTO(out_del_tgt, rc);
254
255         rc = lod_tgt_pool_add(&ltd->ltd_tgt_pool, index,
256                               ltd->ltd_lov_desc.ld_tgt_count);
257         if (rc) {
258                 CERROR("%s: can't set up pool, failed with %d\n",
259                        obd->obd_name, rc);
260                 GOTO(out_del_tgt, rc);
261         }
262
263         mutex_unlock(&ltd->ltd_mutex);
264         up_write(&ltd->ltd_rw_sem);
265
266         if (lod->lod_recovery_completed)
267                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
268
269         if (!for_ost && lod->lod_initialized) {
270                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
271                 if (rc != 0) {
272                         CERROR("%s: cannot start llog on %s:rc = %d\n",
273                                lod2obd(lod)->obd_name, osp, rc);
274                         GOTO(out_ltd, rc);
275                 }
276         }
277
278         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
279         if (rc != 0) {
280                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
281                        "index = %u, rc = %d\n", osp, type, index, rc);
282                 GOTO(out_fini_llog, rc);
283         }
284         RETURN(rc);
285 out_fini_llog:
286         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
287                           tgt_desc->ltd_recovery_thread);
288 out_ltd:
289         down_write(&ltd->ltd_rw_sem);
290         mutex_lock(&ltd->ltd_mutex);
291         if (!for_ost && LTD_TGT(ltd, index)->ltd_recovery_thread != NULL) {
292                 struct ptlrpc_thread *thread;
293
294                 thread = LTD_TGT(ltd, index)->ltd_recovery_thread;
295                 OBD_FREE_PTR(thread);
296         }
297         lod_tgt_pool_remove(&ltd->ltd_tgt_pool, index);
298 out_del_tgt:
299         ltd_del_tgt(ltd, tgt_desc);
300 out_mutex:
301         mutex_unlock(&ltd->ltd_mutex);
302         up_write(&ltd->ltd_rw_sem);
303         OBD_FREE_PTR(tgt_desc);
304 out_cleanup:
305         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
306          * objects from the MDT stack. See LU-7184. */
307         lcfg = &lod_env_info(env)->lti_lustre_cfg;
308         memset(lcfg, 0, sizeof(*lcfg));
309         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
310         lcfg->lcfg_command = LCFG_CLEANUP;
311         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
312
313         if (connected)
314                 obd_disconnect(exp);
315
316         return rc;
317 }
318
319 /**
320  * Schedule target removal from the target table.
321  *
322  * Mark the device as dead. The device is not removed here because it may
323  * still be in use. The device will be removed in lod_putref() when the
324  * last reference is released.
325  *
326  * \param[in] env               execution environment for this thread
327  * \param[in] lod               LOD device the target table belongs to
328  * \param[in] ltd               target table
329  * \param[in] tgt               target
330  */
331 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
332                              struct lod_tgt_descs *ltd, struct lu_tgt_desc *tgt)
333 {
334         lfsck_del_target(env, lod->lod_child, tgt->ltd_tgt, tgt->ltd_index,
335                          !ltd->ltd_is_mdt);
336
337         if (ltd->ltd_is_mdt && tgt->ltd_recovery_thread)
338                 OBD_FREE_PTR(tgt->ltd_recovery_thread);
339
340         if (!tgt->ltd_reap) {
341                 tgt->ltd_reap = 1;
342                 ltd->ltd_death_row++;
343         }
344 }
345
346 /**
347  * Schedule removal of all the targets from the given target table.
348  *
349  * See more details in the description for __lod_del_device()
350  *
351  * \param[in] env               execution environment for this thread
352  * \param[in] lod               LOD device the target table belongs to
353  * \param[in] ltd               target table
354  *
355  * \retval                      0 always
356  */
357 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
358                  struct lod_tgt_descs *ltd)
359 {
360         struct lu_tgt_desc *tgt;
361
362         if (ltd->ltd_tgts_size <= 0)
363                 return 0;
364
365         lod_getref(ltd);
366         mutex_lock(&ltd->ltd_mutex);
367         ltd_foreach_tgt(ltd, tgt)
368                 __lod_del_device(env, lod, ltd, tgt);
369         mutex_unlock(&ltd->ltd_mutex);
370         lod_putref(lod, ltd);
371
372         lu_tgt_descs_fini(ltd);
373
374         return 0;
375 }
376
377 /**
378  * Remove device by name.
379  *
380  * Remove a device identified by \a osp from the target table. Given
381  * the device can be in use, the real deletion happens in lod_putref().
382  *
383  * \param[in] env               execution environment for this thread
384  * \param[in] lod               LOD device to be connected to the new OSP
385  * \param[in] ltd               target table
386  * \param[in] osp               name of OSP device to be removed
387  * \param[in] idx               index of the target
388  * \param[in] gen               generation number, not used currently
389  *
390  * \retval                      0 if the device was scheduled for removal
391  * \retval                      -EINVAL if no device was found
392  */
393 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
394                    struct lod_tgt_descs *ltd, char *osp, unsigned int idx,
395                    unsigned int gen)
396 {
397         struct obd_device *obd;
398         struct lu_tgt_desc *tgt;
399         struct obd_uuid uuid;
400         int rc = 0;
401
402         ENTRY;
403
404         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
405
406         obd_str2uuid(&uuid, osp);
407
408         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
409                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
410         if (obd == NULL) {
411                 CERROR("can't find %s device\n", osp);
412                 RETURN(-EINVAL);
413         }
414
415         if (gen <= 0) {
416                 CERROR("%s: request to remove OBD %s with invalid generation %d"
417                        "\n", obd->obd_name, osp, gen);
418                 RETURN(-EINVAL);
419         }
420
421         obd_str2uuid(&uuid,  osp);
422
423         lod_getref(ltd);
424         mutex_lock(&ltd->ltd_mutex);
425         tgt = LTD_TGT(ltd, idx);
426         /* check that the index is allocated in the bitmap */
427         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) || !tgt) {
428                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
429                 GOTO(out, rc = -EINVAL);
430         }
431
432         /* check that the UUID matches */
433         if (!obd_uuid_equals(&uuid, &tgt->ltd_uuid)) {
434                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
435                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), idx, osp);
436                 GOTO(out, rc = -EINVAL);
437         }
438
439         __lod_del_device(env, lod, ltd, tgt);
440         EXIT;
441 out:
442         mutex_unlock(&ltd->ltd_mutex);
443         lod_putref(lod, ltd);
444         return(rc);
445 }
446
447 /**
448  * Resize per-thread storage to hold specified size.
449  *
450  * A helper function to resize per-thread temporary storage. This storage
451  * is used to process LOV/LVM EAs and may be quite large. We do not want to
452  * allocate/release it every time, so instead we put it into the env and
453  * reallocate on demand. The memory is released when the correspondent thread
454  * is finished.
455  *
456  * \param[in] info              LOD-specific storage in the environment
457  * \param[in] size              new size to grow the buffer to
458
459  * \retval                      0 on success, -ENOMEM if reallocation failed
460  */
461 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
462 {
463         __u32 round = size_roundup_power2(size);
464
465         if (info->lti_ea_store) {
466                 LASSERT(info->lti_ea_store_size);
467                 LASSERT(info->lti_ea_store_size < round);
468                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
469                        info->lti_ea_store_size, round);
470                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
471                 info->lti_ea_store = NULL;
472                 info->lti_ea_store_size = 0;
473         }
474
475         OBD_ALLOC_LARGE(info->lti_ea_store, round);
476         if (info->lti_ea_store == NULL)
477                 RETURN(-ENOMEM);
478         info->lti_ea_store_size = round;
479
480         RETURN(0);
481 }
482
483 static void lod_free_comp_buffer(struct lod_layout_component *entries,
484                                  __u16 count, __u32 bufsize)
485 {
486         struct lod_layout_component *entry;
487         int i;
488
489         for (i = 0; i < count; i++) {
490                 entry = &entries[i];
491                 if (entry->llc_pool != NULL)
492                         lod_set_pool(&entry->llc_pool, NULL);
493                 if (entry->llc_ostlist.op_array)
494                         OBD_FREE(entry->llc_ostlist.op_array,
495                                  entry->llc_ostlist.op_size);
496                 LASSERT(entry->llc_stripe == NULL);
497                 LASSERT(entry->llc_stripes_allocated == 0);
498         }
499
500         if (bufsize != 0)
501                 OBD_FREE_LARGE(entries, bufsize);
502 }
503
504 void lod_free_def_comp_entries(struct lod_default_striping *lds)
505 {
506         lod_free_comp_buffer(lds->lds_def_comp_entries,
507                              lds->lds_def_comp_size_cnt,
508                              size_roundup_power2(
509                                      sizeof(*lds->lds_def_comp_entries) *
510                                      lds->lds_def_comp_size_cnt));
511         lds->lds_def_comp_entries = NULL;
512         lds->lds_def_comp_cnt = 0;
513         lds->lds_def_striping_is_composite = 0;
514         lds->lds_def_comp_size_cnt = 0;
515 }
516
517 /**
518  * Resize per-thread storage to hold default striping component entries
519  *
520  * A helper function to resize per-thread temporary storage. This storage
521  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
522  * to allocate/release it every time, so instead we put it into the env and
523  * reallocate it on demand. The memory is released when the correspondent
524  * thread is finished.
525  *
526  * \param[in,out] lds           default striping
527  * \param[in] count             new component count to grow the buffer to
528
529  * \retval                      0 on success, -ENOMEM if reallocation failed
530  */
531 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
532 {
533         struct lod_layout_component *entries;
534         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
535                                         count);
536         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
537                                         lds->lds_def_comp_size_cnt);
538
539         if (new <= old)
540                 return 0;
541
542         OBD_ALLOC_LARGE(entries, new);
543         if (entries == NULL)
544                 return -ENOMEM;
545
546         if (lds->lds_def_comp_entries != NULL) {
547                 CDEBUG(D_INFO, "default striping component size %d is not "
548                        "enough, need %d\n", old, new);
549                 lod_free_def_comp_entries(lds);
550         }
551
552         lds->lds_def_comp_entries = entries;
553         lds->lds_def_comp_size_cnt = count;
554
555         RETURN(0);
556 }
557
558 void lod_free_comp_entries(struct lod_object *lo)
559 {
560         if (lo->ldo_mirrors) {
561                 OBD_FREE(lo->ldo_mirrors,
562                          sizeof(*lo->ldo_mirrors) * lo->ldo_mirror_count);
563                 lo->ldo_mirrors = NULL;
564                 lo->ldo_mirror_count = 0;
565         }
566         lod_free_comp_buffer(lo->ldo_comp_entries,
567                              lo->ldo_comp_cnt,
568                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
569         lo->ldo_comp_entries = NULL;
570         lo->ldo_comp_cnt = 0;
571         lo->ldo_is_composite = 0;
572 }
573
574 int lod_alloc_comp_entries(struct lod_object *lo,
575                            int mirror_count, int comp_count)
576 {
577         LASSERT(comp_count != 0);
578         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
579
580         if (mirror_count > 0) {
581                 OBD_ALLOC(lo->ldo_mirrors,
582                           sizeof(*lo->ldo_mirrors) * mirror_count);
583                 if (!lo->ldo_mirrors)
584                         return -ENOMEM;
585
586                 lo->ldo_mirror_count = mirror_count;
587         }
588
589         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
590                         sizeof(*lo->ldo_comp_entries) * comp_count);
591         if (lo->ldo_comp_entries == NULL) {
592                 OBD_FREE(lo->ldo_mirrors,
593                          sizeof(*lo->ldo_mirrors) * mirror_count);
594                 lo->ldo_mirror_count = 0;
595                 return -ENOMEM;
596         }
597
598         lo->ldo_comp_cnt = comp_count;
599         return 0;
600 }
601
602 int lod_fill_mirrors(struct lod_object *lo)
603 {
604         struct lod_layout_component *lod_comp;
605         int mirror_idx = -1;
606         __u16 mirror_id = 0xffff;
607         int i;
608         ENTRY;
609
610         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
611
612         if (!lo->ldo_is_composite)
613                 RETURN(0);
614
615         lod_comp = &lo->ldo_comp_entries[0];
616         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
617                 int stale = !!(lod_comp->llc_flags & LCME_FL_STALE);
618                 int preferred = !!(lod_comp->llc_flags & LCME_FL_PREF_WR);
619
620                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
621                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
622                         lo->ldo_mirrors[mirror_idx].lme_primary |= preferred;
623                         lo->ldo_mirrors[mirror_idx].lme_end = i;
624                         continue;
625                 }
626
627                 /* new mirror */
628                 ++mirror_idx;
629                 if (mirror_idx >= lo->ldo_mirror_count)
630                         RETURN(-EINVAL);
631
632                 mirror_id = mirror_id_of(lod_comp->llc_id);
633
634                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
635                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
636                 lo->ldo_mirrors[mirror_idx].lme_primary = preferred;
637                 lo->ldo_mirrors[mirror_idx].lme_start = i;
638                 lo->ldo_mirrors[mirror_idx].lme_end = i;
639         }
640         if (mirror_idx != lo->ldo_mirror_count - 1)
641                 RETURN(-EINVAL);
642
643         RETURN(0);
644 }
645
646 /**
647  * Generate on-disk lov_mds_md structure for each layout component based on
648  * the information in lod_object->ldo_comp_entries[i].
649  *
650  * \param[in] env               execution environment for this thread
651  * \param[in] lo                LOD object
652  * \param[in] comp_idx          index of ldo_comp_entries
653  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
654  * \param[in|out] lmm_size      buffer size/lmm size
655  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
656  *                              the stripe info is from the default stripe
657  *                              template, which is collected in lod_ah_init(),
658  *                              either from parent object or root object; for
659  *                              file case, it's from the @lo object
660  *
661  * \retval                      0 if on disk structure is created successfully
662  * \retval                      negative error number on failure
663  */
664 static int lod_gen_component_ea(const struct lu_env *env,
665                                 struct lod_object *lo, int comp_idx,
666                                 struct lov_mds_md *lmm, int *lmm_size,
667                                 bool is_dir)
668 {
669         struct lod_thread_info  *info = lod_env_info(env);
670         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
671         struct lod_device       *lod;
672         struct lov_ost_data_v1  *objs;
673         struct lod_layout_component *lod_comp;
674         __u32   magic;
675         __u16 stripe_count;
676         int     i, rc = 0;
677         ENTRY;
678
679         LASSERT(lo);
680         if (is_dir)
681                 lod_comp =
682                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
683         else
684                 lod_comp = &lo->ldo_comp_entries[comp_idx];
685
686         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
687         if (lod_comp->llc_pattern == 0) /* default striping */
688                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
689
690         lmm->lmm_magic = cpu_to_le32(magic);
691         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
692         fid_to_lmm_oi(fid, &lmm->lmm_oi);
693         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
694                 lmm->lmm_oi.oi.oi_id++;
695         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
696
697         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
698         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
699         /**
700          * for dir and uninstantiated component, lmm_layout_gen stores
701          * default stripe offset.
702          */
703         lmm->lmm_layout_gen =
704                 (is_dir || !lod_comp_inited(lod_comp)) ?
705                         cpu_to_le16(lod_comp->llc_stripe_offset) :
706                         cpu_to_le16(lod_comp->llc_layout_gen);
707
708         if (magic == LOV_MAGIC_V1) {
709                 objs = &lmm->lmm_objects[0];
710         } else {
711                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
712                 size_t cplen = strlcpy(v3->lmm_pool_name,
713                                        lod_comp->llc_pool,
714                                        sizeof(v3->lmm_pool_name));
715                 if (cplen >= sizeof(v3->lmm_pool_name))
716                         RETURN(-E2BIG);
717                 objs = &v3->lmm_objects[0];
718         }
719         stripe_count = lod_comp_entry_stripe_count(lo, lod_comp, is_dir);
720         if (stripe_count == 0 && !is_dir &&
721             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
722             !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
723                 RETURN(-E2BIG);
724
725         if (!is_dir && lo->ldo_is_composite)
726                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
727
728         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
729                 GOTO(done, rc = 0);
730
731         /* generate ost_idx of this component stripe */
732         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
733         for (i = 0; i < stripe_count; i++) {
734                 struct dt_object *object;
735                 __u32 ost_idx = (__u32)-1UL;
736                 int type = LU_SEQ_RANGE_OST;
737
738                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
739                         object = lod_comp->llc_stripe[i];
740                         /* instantiated component */
741                         info->lti_fid = *lu_object_fid(&object->do_lu);
742
743                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
744                             comp_idx == 0) {
745                                 if (cfs_fail_val == 0)
746                                         cfs_fail_val = info->lti_fid.f_oid;
747                                 else if (i == 0)
748                                         info->lti_fid.f_oid = cfs_fail_val;
749                         }
750
751                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
752                         LASSERT(rc == 0);
753
754                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
755                         objs[i].l_ost_gen = cpu_to_le32(0);
756                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
757                                 rc = -ENOENT;
758                         else
759                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
760                                                     &ost_idx, &type);
761                         if (rc < 0) {
762                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
763                                        lod2obd(lod)->obd_name,
764                                        PFID(&info->lti_fid), rc);
765                                 RETURN(rc);
766                         }
767                 } else if (lod_comp->llc_ostlist.op_array &&
768                            lod_comp->llc_ostlist.op_count) {
769                         /* user specified ost list */
770                         ost_idx = lod_comp->llc_ostlist.op_array[i];
771                 }
772                 /*
773                  * with un-instantiated or with no specified ost list
774                  * component, its l_ost_idx does not matter.
775                  */
776                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
777         }
778 done:
779         if (lmm_size != NULL)
780                 *lmm_size = lov_mds_md_size(stripe_count, magic);
781         RETURN(rc);
782 }
783
784 /**
785  * Generate on-disk lov_mds_md structure based on the information in
786  * the lod_object->ldo_comp_entries.
787  *
788  * \param[in] env               execution environment for this thread
789  * \param[in] lo                LOD object
790  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
791  * \param[in|out] lmm_size      buffer size/lmm size
792  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
793  *                              the stripe info is from the default stripe
794  *                              template, which is collected in lod_ah_init(),
795  *                              either from parent object or root object; for
796  *                              file case, it's from the @lo object
797  *
798  * \retval                      0 if on disk structure is created successfully
799  * \retval                      negative error number on failure
800  */
801 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
802                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
803 {
804         struct lov_comp_md_entry_v1 *lcme;
805         struct lov_comp_md_v1 *lcm;
806         struct lod_layout_component *comp_entries;
807         __u16 comp_cnt, mirror_cnt;
808         bool is_composite, is_foreign = false;
809         int i, rc = 0, offset;
810         ENTRY;
811
812         if (is_dir) {
813                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
814                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
815                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
816                 is_composite =
817                         lo->ldo_def_striping->lds_def_striping_is_composite;
818         } else {
819                 comp_cnt = lo->ldo_comp_cnt;
820                 mirror_cnt = lo->ldo_mirror_count;
821                 comp_entries = lo->ldo_comp_entries;
822                 is_composite = lo->ldo_is_composite;
823                 is_foreign = lo->ldo_is_foreign;
824         }
825
826         LASSERT(lmm_size != NULL);
827
828         if (is_foreign) {
829                 struct lov_foreign_md *lfm;
830
831                 lfm = (struct lov_foreign_md *)lmm;
832                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
833                 /* need to store little-endian */
834                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
835                         __swab32s(&lfm->lfm_magic);
836                         __swab32s(&lfm->lfm_length);
837                         __swab32s(&lfm->lfm_type);
838                         __swab32s(&lfm->lfm_flags);
839                 }
840                 *lmm_size = lo->ldo_foreign_lov_size;
841                 RETURN(0);
842         }
843
844         LASSERT(comp_cnt != 0 && comp_entries != NULL);
845
846         if (!is_composite) {
847                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
848                 RETURN(rc);
849         }
850
851         lcm = (struct lov_comp_md_v1 *)lmm;
852         memset(lcm, 0, sizeof(*lcm));
853
854         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
855         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
856         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
857         lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
858
859         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
860         LASSERT(offset % sizeof(__u64) == 0);
861
862         for (i = 0; i < comp_cnt; i++) {
863                 struct lod_layout_component *lod_comp;
864                 struct lov_mds_md *sub_md;
865                 int size;
866
867                 lod_comp = &comp_entries[i];
868                 lcme = &lcm->lcm_entries[i];
869
870                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
871                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
872
873                 /* component could be un-inistantiated */
874                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
875                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
876                         lcme->lcme_timestamp =
877                                 cpu_to_le64(lod_comp->llc_timestamp);
878                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
879                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
880
881                 lcme->lcme_extent.e_start =
882                         cpu_to_le64(lod_comp->llc_extent.e_start);
883                 lcme->lcme_extent.e_end =
884                         cpu_to_le64(lod_comp->llc_extent.e_end);
885                 lcme->lcme_offset = cpu_to_le32(offset);
886
887                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
888                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
889                 if (rc)
890                         GOTO(out, rc);
891                 lcme->lcme_size = cpu_to_le32(size);
892                 offset += size;
893                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
894                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
895         }
896         lcm->lcm_size = cpu_to_le32(offset);
897         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
898
899         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
900                              "generate lum");
901 out:
902         if (rc == 0)
903                 *lmm_size = offset;
904         RETURN(rc);
905 }
906
907 /**
908  * Get LOV EA.
909  *
910  * Fill lti_ea_store buffer in the environment with a value for the given
911  * EA. The buffer is reallocated if the value doesn't fit.
912  *
913  * \param[in,out] env           execution environment for this thread
914  *                              .lti_ea_store buffer is filled with EA's value
915  * \param[in] lo                LOD object
916  * \param[in] name              name of the EA
917  *
918  * \retval                      > 0 if EA is fetched successfully
919  * \retval                      0 if EA is empty
920  * \retval                      negative error number on failure
921  */
922 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
923                const char *name)
924 {
925         struct lod_thread_info  *info = lod_env_info(env);
926         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
927         int                     rc;
928         ENTRY;
929
930         LASSERT(info);
931
932         if (unlikely(info->lti_ea_store == NULL)) {
933                 /* just to enter in allocation block below */
934                 rc = -ERANGE;
935         } else {
936 repeat:
937                 info->lti_buf.lb_buf = info->lti_ea_store;
938                 info->lti_buf.lb_len = info->lti_ea_store_size;
939                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
940         }
941
942         /* if object is not striped or inaccessible */
943         if (rc == -ENODATA || rc == -ENOENT)
944                 RETURN(0);
945
946         if (rc == -ERANGE) {
947                 /* EA doesn't fit, reallocate new buffer */
948                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
949                 if (rc == -ENODATA || rc == -ENOENT)
950                         RETURN(0);
951                 else if (rc < 0)
952                         RETURN(rc);
953
954                 LASSERT(rc > 0);
955                 rc = lod_ea_store_resize(info, rc);
956                 if (rc)
957                         RETURN(rc);
958                 goto repeat;
959         }
960
961         RETURN(rc);
962 }
963
964 /**
965  * Verify the target index is present in the current configuration.
966  *
967  * \param[in] md                LOD device where the target table is stored
968  * \param[in] idx               target's index
969  *
970  * \retval                      0 if the index is present
971  * \retval                      -EINVAL if not
972  */
973 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
974 {
975         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
976                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
977                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
978                        md->lod_ost_descs.ltd_tgts_size);
979                 return -EINVAL;
980         }
981
982         if (unlikely(OST_TGT(md, idx) == NULL)) {
983                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
984                        lod2obd(md)->obd_name, idx);
985                 return -EINVAL;
986         }
987
988         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
989                 CERROR("%s: invalid lod device, for idx: %d\n",
990                        lod2obd(md)->obd_name , idx);
991                 return -EINVAL;
992         }
993
994         return 0;
995 }
996
997 /**
998  * Instantiate objects for stripes.
999  *
1000  * Allocate and initialize LU-objects representing the stripes. The number
1001  * of the stripes (ldo_stripe_count) must be initialized already. The caller
1002  * must ensure nobody else is calling the function on the object at the same
1003  * time. FLDB service must be running to be able to map a FID to the targets
1004  * and find appropriate device representing that target.
1005  *
1006  * \param[in] env               execution environment for this thread
1007  * \param[in,out] lo            LOD object
1008  * \param[in] objs              an array of IDs to creates the objects from
1009  * \param[in] comp_idx          index of ldo_comp_entries
1010  *
1011  * \retval                      0 if the objects are instantiated successfully
1012  * \retval                      negative error number on failure
1013  */
1014 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1015                            struct lov_ost_data_v1 *objs, int comp_idx)
1016 {
1017         struct lod_layout_component *lod_comp;
1018         struct lod_thread_info *info = lod_env_info(env);
1019         struct lod_device *md;
1020         struct lu_object *o, *n;
1021         struct lu_device *nd;
1022         struct dt_object **stripe = NULL;
1023         __u32 *ost_indices = NULL;
1024         int stripe_len;
1025         int i, rc = 0;
1026         __u32 idx;
1027         ENTRY;
1028
1029         LASSERT(lo != NULL);
1030         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1031
1032         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1033         lod_comp = &lo->ldo_comp_entries[comp_idx];
1034
1035         LASSERT(lod_comp->llc_stripe == NULL);
1036         LASSERT(lod_comp->llc_stripe_count > 0);
1037         LASSERT(lod_comp->llc_stripe_size > 0);
1038
1039         stripe_len = lod_comp->llc_stripe_count;
1040         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
1041         if (stripe == NULL)
1042                 RETURN(-ENOMEM);
1043         OBD_ALLOC(ost_indices, sizeof(*ost_indices) * stripe_len);
1044         if (!ost_indices)
1045                 GOTO(out, rc = -ENOMEM);
1046
1047         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1048                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1049                         continue;
1050
1051                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1052                 idx = le32_to_cpu(objs[i].l_ost_idx);
1053                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1054                 if (rc != 0)
1055                         GOTO(out, rc);
1056                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1057                          PFID(&info->lti_fid));
1058                 lod_getref(&md->lod_ost_descs);
1059
1060                 rc = validate_lod_and_idx(md, idx);
1061                 if (unlikely(rc != 0)) {
1062                         lod_putref(md, &md->lod_ost_descs);
1063                         GOTO(out, rc);
1064                 }
1065
1066                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1067                 lod_putref(md, &md->lod_ost_descs);
1068
1069                 /* In the function below, .hs_keycmp resolves to
1070                  * u_obj_hop_keycmp() */
1071                 /* coverity[overrun-buffer-val] */
1072                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1073                 if (IS_ERR(o))
1074                         GOTO(out, rc = PTR_ERR(o));
1075
1076                 n = lu_object_locate(o->lo_header, nd->ld_type);
1077                 LASSERT(n);
1078
1079                 stripe[i] = container_of(n, struct dt_object, do_lu);
1080                 ost_indices[i] = idx;
1081         }
1082
1083 out:
1084         if (rc != 0) {
1085                 for (i = 0; i < stripe_len; i++)
1086                         if (stripe[i] != NULL)
1087                                 dt_object_put(env, stripe[i]);
1088
1089                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
1090                 lod_comp->llc_stripe_count = 0;
1091                 if (ost_indices)
1092                         OBD_FREE(ost_indices,
1093                                  sizeof(*ost_indices) * stripe_len);
1094         } else {
1095                 lod_comp->llc_stripe = stripe;
1096                 lod_comp->llc_ost_indices = ost_indices;
1097                 lod_comp->llc_stripes_allocated = stripe_len;
1098         }
1099
1100         RETURN(rc);
1101 }
1102
1103 /**
1104  * Instantiate objects for striping.
1105  *
1106  * Parse striping information in \a buf and instantiate the objects
1107  * representing the stripes.
1108  *
1109  * \param[in] env               execution environment for this thread
1110  * \param[in] lo                LOD object
1111  * \param[in] buf               buffer storing LOV EA to parse
1112  *
1113  * \retval                      0 if parsing and objects creation succeed
1114  * \retval                      negative error number on failure
1115  */
1116 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1117                        const struct lu_buf *buf)
1118 {
1119         struct lov_mds_md_v1 *lmm;
1120         struct lov_comp_md_v1 *comp_v1 = NULL;
1121         struct lov_foreign_md *foreign = NULL;
1122         struct lov_ost_data_v1 *objs;
1123         __u32 magic, pattern;
1124         __u16 mirror_cnt = 0;
1125         __u16 comp_cnt;
1126         int i, rc;
1127         ENTRY;
1128
1129         LASSERT(buf);
1130         LASSERT(buf->lb_buf);
1131         LASSERT(buf->lb_len);
1132         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1133
1134         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1135         magic = le32_to_cpu(lmm->lmm_magic);
1136
1137         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1138             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1139             magic != LOV_MAGIC_SEL)
1140                 GOTO(out, rc = -EINVAL);
1141
1142         if (lo->ldo_is_foreign)
1143                 lod_free_foreign_lov(lo);
1144         else
1145                 lod_free_comp_entries(lo);
1146
1147         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1148                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1149                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1150                 if (comp_cnt == 0)
1151                         GOTO(out, rc = -EINVAL);
1152                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1153                 lo->ldo_is_composite = 1;
1154                 lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1155                                         LCM_FL_FLR_MASK;
1156                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1157         } else if (magic == LOV_MAGIC_FOREIGN) {
1158                 size_t length;
1159
1160                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1161                 length = offsetof(typeof(*foreign), lfm_value);
1162                 if (buf->lb_len < length ||
1163                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1164                         CDEBUG(D_LAYOUT,
1165                                "buf len %zu too small for lov_foreign_md\n",
1166                                buf->lb_len);
1167                         GOTO(out, rc = -EINVAL);
1168                 }
1169
1170                 /* just cache foreign LOV EA raw */
1171                 rc = lod_alloc_foreign_lov(lo, length);
1172                 if (rc)
1173                         GOTO(out, rc);
1174                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1175                 GOTO(out, rc);
1176         } else {
1177                 comp_cnt = 1;
1178                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1179                 lo->ldo_is_composite = 0;
1180         }
1181
1182         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1183         if (rc)
1184                 GOTO(out, rc);
1185
1186         for (i = 0; i < comp_cnt; i++) {
1187                 struct lod_layout_component *lod_comp;
1188                 struct lu_extent *ext;
1189                 __u32 offs;
1190
1191                 lod_comp = &lo->ldo_comp_entries[i];
1192                 if (lo->ldo_is_composite) {
1193                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1194                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1195
1196                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1197                         lod_comp->llc_extent.e_start =
1198                                 le64_to_cpu(ext->e_start);
1199                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1200                         lod_comp->llc_flags =
1201                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1202                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1203                                 lod_comp->llc_timestamp = le64_to_cpu(
1204                                         comp_v1->lcm_entries[i].lcme_timestamp);
1205                         lod_comp->llc_id =
1206                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1207                         if (lod_comp->llc_id == LCME_ID_INVAL)
1208                                 GOTO(out, rc = -EINVAL);
1209
1210                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1211                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1212                                 struct lod_device *d =
1213                                         lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1214
1215                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1216                                       lod2obd(d)->obd_name,
1217                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1218                                       PFID(lod_object_fid(lo)),
1219                                       le32_to_cpu(comp_v1->lcm_magic));
1220                         }
1221                 } else {
1222                         lod_comp_set_init(lod_comp);
1223                 }
1224
1225                 pattern = le32_to_cpu(lmm->lmm_pattern);
1226                 if (!lov_pattern_supported(lov_pattern(pattern)))
1227                         GOTO(out, rc = -EINVAL);
1228
1229                 lod_comp->llc_pattern = pattern;
1230                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1231                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1232                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1233
1234                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1235                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1236
1237                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1238                         objs = &v3->lmm_objects[0];
1239                 } else {
1240                         lod_set_pool(&lod_comp->llc_pool, NULL);
1241                         objs = &lmm->lmm_objects[0];
1242                 }
1243
1244                 /**
1245                  * If uninstantiated template component has valid l_ost_idx,
1246                  * then user has specified ost list for this component.
1247                  */
1248                 if (!lod_comp_inited(lod_comp)) {
1249                         __u16 stripe_count;
1250
1251                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1252                                 int j;
1253
1254                                 stripe_count = lod_comp_entry_stripe_count(
1255                                                         lo, lod_comp, false);
1256                                 if (stripe_count == 0 &&
1257                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1258                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1259                                         GOTO(out, rc = -E2BIG);
1260                                 /**
1261                                  * load the user specified ost list, when this
1262                                  * component is instantiated later, it will be
1263                                  * used in lod_alloc_ost_list().
1264                                  */
1265                                 lod_comp->llc_ostlist.op_count = stripe_count;
1266                                 lod_comp->llc_ostlist.op_size =
1267                                         stripe_count * sizeof(__u32);
1268                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1269                                           lod_comp->llc_ostlist.op_size);
1270                                 if (!lod_comp->llc_ostlist.op_array)
1271                                         GOTO(out, rc = -ENOMEM);
1272
1273                                 for (j = 0; j < stripe_count; j++)
1274                                         lod_comp->llc_ostlist.op_array[j] =
1275                                                 le32_to_cpu(objs[j].l_ost_idx);
1276
1277                                 /**
1278                                  * this component OST objects starts from the
1279                                  * first ost_idx, lod_alloc_ost_list() will
1280                                  * check this.
1281                                  */
1282                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1283                         } else {
1284                                 /**
1285                                  * for uninstantiated component,
1286                                  * lmm_layout_gen stores default stripe offset.
1287                                  */
1288                                 lod_comp->llc_stripe_offset =
1289                                                         lmm->lmm_layout_gen;
1290                         }
1291                 }
1292
1293                 /* skip un-instantiated component object initialization */
1294                 if (!lod_comp_inited(lod_comp))
1295                         continue;
1296
1297                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1298                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1299                         rc = lod_initialize_objects(env, lo, objs, i);
1300                         if (rc)
1301                                 GOTO(out, rc);
1302                 }
1303         }
1304
1305         rc = lod_fill_mirrors(lo);
1306         if (rc)
1307                 GOTO(out, rc);
1308
1309 out:
1310         if (rc)
1311                 lod_striping_free_nolock(env, lo);
1312         RETURN(rc);
1313 }
1314
1315 /**
1316  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1317  * is already cached.
1318  *
1319  * \param[in] lo        LOD object
1320  *
1321  * \retval              True if the striping is cached, otherwise
1322  *                      return false.
1323  */
1324 static bool lod_striping_loaded(struct lod_object *lo)
1325 {
1326         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1327             lo->ldo_comp_cached)
1328                 return true;
1329
1330         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1331                 if (lo->ldo_dir_stripe_loaded)
1332                         return true;
1333
1334                 /* Never load LMV stripe for slaves of striped dir */
1335                 if (lo->ldo_dir_slave_stripe)
1336                         return true;
1337         }
1338
1339         return false;
1340 }
1341
1342 /**
1343  * A generic function to initialize the stripe objects.
1344  *
1345  * A protected version of lod_striping_load_locked() - load the striping
1346  * information from storage, parse that and instantiate LU objects to
1347  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1348  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1349  * return an array of references to the newly instantiated objects.
1350  *
1351  * \param[in] env               execution environment for this thread
1352  * \param[in,out] lo            LOD object, where striping is stored and
1353  *                              which gets an array of references
1354  *
1355  * \retval                      0 if parsing and object creation succeed
1356  * \retval                      negative error number on failure
1357  **/
1358 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1359 {
1360         struct lod_thread_info *info = lod_env_info(env);
1361         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1362         struct lu_buf *buf = &info->lti_buf;
1363         int rc = 0;
1364
1365         ENTRY;
1366
1367         if (!dt_object_exists(next))
1368                 RETURN(0);
1369
1370         if (lod_striping_loaded(lo))
1371                 RETURN(0);
1372
1373         mutex_lock(&lo->ldo_layout_mutex);
1374         if (lod_striping_loaded(lo))
1375                 GOTO(unlock, rc = 0);
1376
1377         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1378                 rc = lod_get_lov_ea(env, lo);
1379                 if (rc <= 0)
1380                         GOTO(unlock, rc);
1381
1382                 /*
1383                  * there is LOV EA (striping information) in this object
1384                  * let's parse it and create in-core objects for the stripes
1385                  */
1386                 buf->lb_buf = info->lti_ea_store;
1387                 buf->lb_len = info->lti_ea_store_size;
1388                 rc = lod_parse_striping(env, lo, buf);
1389                 if (rc == 0)
1390                         lo->ldo_comp_cached = 1;
1391         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1392                 rc = lod_get_lmv_ea(env, lo);
1393                 if (rc > sizeof(struct lmv_foreign_md)) {
1394                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1395
1396                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1397                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1398                                 lo->ldo_foreign_lmv_size =
1399                                         info->lti_ea_store_size;
1400                                 info->lti_ea_store = NULL;
1401                                 info->lti_ea_store_size = 0;
1402
1403                                 lo->ldo_dir_stripe_loaded = 1;
1404                                 lo->ldo_dir_is_foreign = 1;
1405                                 GOTO(unlock, rc = 0);
1406                         }
1407                 }
1408
1409                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1410                         /* Let's set stripe_loaded to avoid further
1411                          * stripe loading especially for non-stripe directory,
1412                          * which can hurt performance. (See LU-9840)
1413                          */
1414                         if (rc == 0)
1415                                 lo->ldo_dir_stripe_loaded = 1;
1416                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1417                 }
1418                 buf->lb_buf = info->lti_ea_store;
1419                 buf->lb_len = info->lti_ea_store_size;
1420                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1421                         rc = lod_load_lmv_shards(env, lo, buf, true);
1422                         if (buf->lb_buf != info->lti_ea_store) {
1423                                 OBD_FREE_LARGE(info->lti_ea_store,
1424                                                info->lti_ea_store_size);
1425                                 info->lti_ea_store = buf->lb_buf;
1426                                 info->lti_ea_store_size = buf->lb_len;
1427                         }
1428
1429                         if (rc < 0)
1430                                 GOTO(unlock, rc);
1431                 }
1432
1433                 /*
1434                  * there is LMV EA (striping information) in this object
1435                  * let's parse it and create in-core objects for the stripes
1436                  */
1437                 rc = lod_parse_dir_striping(env, lo, buf);
1438                 if (rc == 0)
1439                         lo->ldo_dir_stripe_loaded = 1;
1440         }
1441         EXIT;
1442 unlock:
1443         mutex_unlock(&lo->ldo_layout_mutex);
1444
1445         return rc;
1446 }
1447
1448 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1449                          const struct lu_buf *buf)
1450 {
1451         int rc;
1452
1453         ENTRY;
1454
1455         mutex_lock(&lo->ldo_layout_mutex);
1456         lod_striping_free_nolock(env, lo);
1457         rc = lod_parse_striping(env, lo, buf);
1458         mutex_unlock(&lo->ldo_layout_mutex);
1459
1460         RETURN(rc);
1461 }
1462
1463 /**
1464  * Verify lov_user_md_v1/v3 striping.
1465  *
1466  * Check the validity of all fields including the magic, stripe size,
1467  * stripe count, stripe offset and that the pool is present.  Also check
1468  * that each target index points to an existing target. The additional
1469  * \a is_from_disk turns additional checks. In some cases zero fields
1470  * are allowed (like pattern=0).
1471  *
1472  * \param[in] d                 LOD device
1473  * \param[in] buf               buffer with LOV EA to verify
1474  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1475  *                              1 - from disk, do not allow
1476  *
1477  * \retval                      0 if the striping is valid
1478  * \retval                      -EINVAL if striping is invalid
1479  */
1480 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1481                            bool is_from_disk)
1482 {
1483         struct lov_user_md_v1   *lum;
1484         struct lov_user_md_v3   *lum3;
1485         struct pool_desc        *pool = NULL;
1486         __u32                    magic;
1487         __u32                    stripe_size;
1488         __u16                    stripe_count;
1489         __u16                    stripe_offset;
1490         size_t                   lum_size;
1491         int                      rc = 0;
1492         ENTRY;
1493
1494         lum = buf->lb_buf;
1495
1496         if (buf->lb_len < sizeof(*lum)) {
1497                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1498                        buf->lb_len);
1499                 GOTO(out, rc = -EINVAL);
1500         }
1501
1502         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1503         if (magic != LOV_USER_MAGIC_V1 &&
1504             magic != LOV_USER_MAGIC_V3 &&
1505             magic != LOV_USER_MAGIC_SPECIFIC) {
1506                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1507                        le32_to_cpu(lum->lmm_magic));
1508                 GOTO(out, rc = -EINVAL);
1509         }
1510
1511         /* the user uses "0" for default stripe pattern normally. */
1512         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1513                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1514
1515         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1516                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1517                        le32_to_cpu(lum->lmm_pattern));
1518                 GOTO(out, rc = -EINVAL);
1519         }
1520
1521         /* a released lum comes from creating orphan on hsm release,
1522          * doesn't make sense to verify it. */
1523         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1524                 GOTO(out, rc = 0);
1525
1526         /* 64kB is the largest common page size we see (ia64), and matches the
1527          * check in lfs */
1528         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1529         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1530                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1531                        stripe_size, LOV_MIN_STRIPE_SIZE);
1532                 GOTO(out, rc = -EINVAL);
1533         }
1534
1535         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1536         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1537             lov_pattern(le32_to_cpu(lum->lmm_pattern)) != LOV_PATTERN_MDT) {
1538                 /* if offset is not within valid range [0, osts_size) */
1539                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1540                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1541                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1542                         GOTO(out, rc = -EINVAL);
1543                 }
1544
1545                 /* if lmm_stripe_offset is *not* in bitmap */
1546                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1547                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1548                                stripe_offset);
1549                         GOTO(out, rc = -EINVAL);
1550                 }
1551         }
1552
1553         if (magic == LOV_USER_MAGIC_V1)
1554                 lum_size = offsetof(struct lov_user_md_v1,
1555                                     lmm_objects[0]);
1556         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1557                 lum_size = offsetof(struct lov_user_md_v3,
1558                                     lmm_objects[0]);
1559         else
1560                 GOTO(out, rc = -EINVAL);
1561
1562         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1563         if (buf->lb_len < lum_size) {
1564                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1565                        "magic %#x and stripe_count %u\n",
1566                        buf->lb_len, lum_size, magic, stripe_count);
1567                 GOTO(out, rc = -EINVAL);
1568         }
1569
1570         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1571                 goto out;
1572
1573         lum3 = buf->lb_buf;
1574         /* In the function below, .hs_keycmp resolves to
1575          * pool_hashkey_keycmp() */
1576         /* coverity[overrun-buffer-val] */
1577         pool = lod_find_pool(d, lum3->lmm_pool_name);
1578         if (pool == NULL)
1579                 goto out;
1580
1581         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1582                 rc = lod_check_index_in_pool(stripe_offset, pool);
1583                 if (rc < 0)
1584                         GOTO(out, rc = -EINVAL);
1585         }
1586
1587         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1588                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1589                        stripe_count, pool_tgt_count(pool));
1590                 GOTO(out, rc = -EINVAL);
1591         }
1592
1593 out:
1594         if (pool != NULL)
1595                 lod_pool_putref(pool);
1596
1597         RETURN(rc);
1598 }
1599
1600 static inline
1601 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1602 {
1603         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1604                  LOV_USER_MAGIC_COMP_V1, "Wrong magic %x\n",
1605                  le32_to_cpu(comp->lcm_magic));
1606         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1607                  "bad index %d, max = %d\n",
1608                  i, le16_to_cpu(comp->lcm_entry_count));
1609
1610         return &comp->lcm_entries[i];
1611 }
1612
1613 #define for_each_comp_entry_v1(comp, entry) \
1614         for (entry = comp_entry_v1(comp, 0); \
1615              entry <= comp_entry_v1(comp, \
1616                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1617              entry++)
1618
1619 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1620                          struct lov_comp_md_entry_v1 *dom_ent)
1621 {
1622         struct lov_comp_md_entry_v1 *ent;
1623         __u16 entries;
1624         __u32 dom_off, dom_size, comp_size;
1625         void *blob_src, *blob_dst;
1626         unsigned int blob_size, blob_shift;
1627
1628         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1629         /* if file has only DoM stripe return just error */
1630         if (entries == 0)
1631                 return -EFBIG;
1632
1633         comp_size = le32_to_cpu(comp_v1->lcm_size);
1634         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1635         dom_size = le32_to_cpu(dom_ent->lcme_size);
1636
1637         /* shift entries array first */
1638         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1639         memmove(dom_ent, dom_ent + 1,
1640                 entries * sizeof(struct lov_comp_md_entry_v1));
1641
1642         /* now move blob of layouts */
1643         blob_dst = (void *)comp_v1 + dom_off - sizeof(*dom_ent);
1644         blob_src = (void *)comp_v1 + dom_off + dom_size;
1645         blob_size = (unsigned long)((void *)comp_v1 + comp_size - blob_src);
1646         blob_shift = sizeof(*dom_ent) + dom_size;
1647
1648         memmove(blob_dst, blob_src, blob_size);
1649
1650         for_each_comp_entry_v1(comp_v1, ent) {
1651                 __u32 off;
1652
1653                 off = le32_to_cpu(ent->lcme_offset);
1654                 ent->lcme_offset = cpu_to_le32(off - blob_shift);
1655         }
1656
1657         comp_v1->lcm_size = cpu_to_le32(comp_size - blob_shift);
1658
1659         /* notify a caller to re-check entry */
1660         return -ERESTART;
1661 }
1662
1663 int lod_fix_dom_stripe(struct lod_device *d, struct lov_comp_md_v1 *comp_v1,
1664                        struct lov_comp_md_entry_v1 *dom_ent)
1665 {
1666         struct lov_comp_md_entry_v1 *ent;
1667         struct lu_extent *dom_ext, *ext;
1668         struct lov_user_md_v1 *lum;
1669         __u32 stripe_size;
1670         __u16 mid, dom_mid;
1671         int rc = 0;
1672
1673         dom_ext = &dom_ent->lcme_extent;
1674         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
1675         stripe_size = d->lod_dom_max_stripesize;
1676
1677         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
1678         CDEBUG(D_LAYOUT, "DoM component size %u was bigger than MDT limit %u, "
1679                "new size is %u\n", le32_to_cpu(lum->lmm_stripe_size),
1680                d->lod_dom_max_stripesize, stripe_size);
1681         lum->lmm_stripe_size = cpu_to_le32(stripe_size);
1682
1683         for_each_comp_entry_v1(comp_v1, ent) {
1684                 if (ent == dom_ent)
1685                         continue;
1686
1687                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
1688                 if (mid != dom_mid)
1689                         continue;
1690
1691                 ext = &ent->lcme_extent;
1692                 if (ext->e_start != dom_ext->e_end)
1693                         continue;
1694
1695                 /* Found next component after the DoM one with the same
1696                  * mirror_id and adjust its start with DoM component end.
1697                  *
1698                  * NOTE: we are considering here that there can be only one
1699                  * DoM component in a file, all replicas are located on OSTs
1700                  * always and don't need adjustment since use own layouts.
1701                  */
1702                 ext->e_start = cpu_to_le64(stripe_size);
1703                 break;
1704         }
1705
1706         if (stripe_size == 0) {
1707                 /* DoM component size is zero due to server setting,
1708                  * remove it from the layout */
1709                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
1710         } else {
1711                 /* Update DoM extent end finally */
1712                 dom_ext->e_end = cpu_to_le64(stripe_size);
1713         }
1714
1715         return rc;
1716 }
1717
1718 /**
1719  * Verify LOV striping.
1720  *
1721  * \param[in] d                 LOD device
1722  * \param[in] buf               buffer with LOV EA to verify
1723  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1724  *                              1 - from disk, do not allow
1725  * \param[in] start             extent start for composite layout
1726  *
1727  * \retval                      0 if the striping is valid
1728  * \retval                      -EINVAL if striping is invalid
1729  */
1730 int lod_verify_striping(struct lod_device *d, struct lod_object *lo,
1731                         const struct lu_buf *buf, bool is_from_disk)
1732 {
1733         struct lov_desc *desc = &d->lod_ost_descs.ltd_lov_desc;
1734         struct lov_user_md_v1   *lum;
1735         struct lov_comp_md_v1   *comp_v1;
1736         struct lov_comp_md_entry_v1     *ent;
1737         struct lu_extent        *ext;
1738         struct lu_buf   tmp;
1739         __u64   prev_end = 0;
1740         __u32   stripe_size = 0;
1741         __u16   prev_mid = -1, mirror_id = -1;
1742         __u32   mirror_count;
1743         __u32   magic;
1744         int     rc = 0;
1745         ENTRY;
1746
1747         if (buf->lb_len < sizeof(lum->lmm_magic)) {
1748                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
1749                 RETURN(-EINVAL);
1750         }
1751
1752         lum = buf->lb_buf;
1753
1754         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1755         /* treat foreign LOV EA/object case first
1756          * XXX is it expected to try setting again a foreign?
1757          * XXX should we care about different current vs new layouts ?
1758          */
1759         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
1760                 struct lov_foreign_md *lfm = buf->lb_buf;
1761
1762                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
1763                         CDEBUG(D_LAYOUT,
1764                                "buf len %zu < min lov_foreign_md size (%zu)\n",
1765                                buf->lb_len, offsetof(typeof(*lfm),
1766                                lfm_value));
1767                         RETURN(-EINVAL);
1768                 }
1769
1770                 if (foreign_size_le(lfm) > buf->lb_len) {
1771                         CDEBUG(D_LAYOUT,
1772                                "buf len %zu < this lov_foreign_md size (%zu)\n",
1773                                buf->lb_len, foreign_size_le(lfm));
1774                         RETURN(-EINVAL);
1775                 }
1776                 /* Don't do anything with foreign layouts */
1777                 RETURN(0);
1778         }
1779
1780         /* normal LOV/layout cases */
1781
1782         if (buf->lb_len < sizeof(*lum)) {
1783                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1784                        buf->lb_len);
1785                 RETURN(-EINVAL);
1786         }
1787
1788         if (magic != LOV_USER_MAGIC_V1 &&
1789             magic != LOV_USER_MAGIC_V3 &&
1790             magic != LOV_USER_MAGIC_SPECIFIC &&
1791             magic != LOV_USER_MAGIC_COMP_V1) {
1792                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1793                        le32_to_cpu(lum->lmm_magic));
1794                 RETURN(-EINVAL);
1795         }
1796
1797         if (magic != LOV_USER_MAGIC_COMP_V1)
1798                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
1799
1800         /* magic == LOV_USER_MAGIC_COMP_V1 */
1801         comp_v1 = buf->lb_buf;
1802         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
1803                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
1804                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
1805                 RETURN(-EINVAL);
1806         }
1807
1808 recheck:
1809         mirror_count = 0;
1810         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
1811                 CDEBUG(D_LAYOUT, "entry count is zero\n");
1812                 RETURN(-EINVAL);
1813         }
1814
1815         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1816             lo->ldo_comp_cnt > 0) {
1817                 /* could be called from lustre.lov.add */
1818                 __u32 cnt = lo->ldo_comp_cnt;
1819
1820                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
1821                 prev_end = ext->e_end;
1822
1823                 ++mirror_count;
1824         }
1825
1826         for_each_comp_entry_v1(comp_v1, ent) {
1827                 ext = &ent->lcme_extent;
1828
1829                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end)) {
1830                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
1831                                le64_to_cpu(ext->e_start),
1832                                le64_to_cpu(ext->e_end));
1833                         RETURN(-EINVAL);
1834                 }
1835
1836                 if (is_from_disk) {
1837                         /* lcme_id contains valid value */
1838                         if (le32_to_cpu(ent->lcme_id) == 0 ||
1839                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
1840                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
1841                                        le32_to_cpu(ent->lcme_id));
1842                                 RETURN(-EINVAL);
1843                         }
1844
1845                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
1846                                 mirror_id = mirror_id_of(
1847                                                 le32_to_cpu(ent->lcme_id));
1848
1849                                 /* first component must start with 0 */
1850                                 if (mirror_id != prev_mid &&
1851                                     le64_to_cpu(ext->e_start) != 0) {
1852                                         CDEBUG(D_LAYOUT,
1853                                                "invalid start:%llu, expect:0\n",
1854                                                le64_to_cpu(ext->e_start));
1855                                         RETURN(-EINVAL);
1856                                 }
1857
1858                                 prev_mid = mirror_id;
1859                         }
1860                 }
1861
1862                 if (le64_to_cpu(ext->e_start) == 0) {
1863                         ++mirror_count;
1864                         prev_end = 0;
1865                 }
1866
1867                 /* the next must be adjacent with the previous one */
1868                 if (le64_to_cpu(ext->e_start) != prev_end) {
1869                         CDEBUG(D_LAYOUT,
1870                                "invalid start actual:%llu, expect:%llu\n",
1871                                le64_to_cpu(ext->e_start), prev_end);
1872                         RETURN(-EINVAL);
1873                 }
1874
1875                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
1876                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
1877
1878                 /* Check DoM entry is always the first one */
1879                 lum = tmp.lb_buf;
1880                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) ==
1881                     LOV_PATTERN_MDT) {
1882                         /* DoM component must be the first in a mirror */
1883                         if (le64_to_cpu(ext->e_start) > 0) {
1884                                 CDEBUG(D_LAYOUT, "invalid DoM component "
1885                                        "with %llu extent start\n",
1886                                        le64_to_cpu(ext->e_start));
1887                                 RETURN(-EINVAL);
1888                         }
1889                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1890                         /* There is just one stripe on MDT and it must
1891                          * cover whole component size. */
1892                         if (stripe_size != le64_to_cpu(ext->e_end)) {
1893                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
1894                                        "stripe size %u != %llu "
1895                                        "(component size)\n",
1896                                        stripe_size, prev_end);
1897                                 RETURN(-EINVAL);
1898                         }
1899                         /* Check stripe size againts per-MDT limit */
1900                         if (stripe_size > d->lod_dom_max_stripesize) {
1901                                 CDEBUG(D_LAYOUT, "DoM component size "
1902                                        "%u is bigger than MDT limit %u, check "
1903                                        "dom_max_stripesize parameter\n",
1904                                        stripe_size, d->lod_dom_max_stripesize);
1905                                 rc = lod_fix_dom_stripe(d, comp_v1, ent);
1906                                 if (rc == -ERESTART) {
1907                                         /* DoM entry was removed, re-check
1908                                          * new layout from start */
1909                                         goto recheck;
1910                                 } else if (rc) {
1911                                         RETURN(rc);
1912                                 }
1913                         }
1914                         /* Any stripe count is forbidden on DoM component */
1915                         if (lum->lmm_stripe_count) {
1916                                 CDEBUG(D_LAYOUT,
1917                                        "invalid DoM layout stripe count %u, must be 0\n",
1918                                        le16_to_cpu(lum->lmm_stripe_count));
1919                                 RETURN(-EINVAL);
1920                         }
1921
1922                         /* Any pool is forbidden on DoM component */
1923                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
1924                                 struct lov_user_md_v3 *v3 = (void *)lum;
1925
1926                                 if (v3->lmm_pool_name[0] != '\0') {
1927                                         CDEBUG(D_LAYOUT,
1928                                                "DoM component cannot have pool assigned\n");
1929                                         RETURN(-EINVAL);
1930                                 }
1931                         }
1932                 }
1933
1934                 prev_end = le64_to_cpu(ext->e_end);
1935
1936                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
1937                 if (rc)
1938                         RETURN(rc);
1939
1940                 if (prev_end == LUSTRE_EOF)
1941                         continue;
1942
1943                 /* extent end must be aligned with the stripe_size */
1944                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1945                 if (stripe_size == 0)
1946                         stripe_size = desc->ld_default_stripe_size;
1947                 if (prev_end % stripe_size) {
1948                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
1949                                "stripe_sz: %u, [%llu, %llu)\n",
1950                                stripe_size, ext->e_start, prev_end);
1951                         RETURN(-EINVAL);
1952                 }
1953         }
1954
1955         /* make sure that the mirror_count is telling the truth */
1956         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
1957                 RETURN(-EINVAL);
1958
1959         RETURN(0);
1960 }
1961
1962 /**
1963  * set the default stripe size, if unset.
1964  *
1965  * \param[in,out] val   number of bytes per OST stripe
1966  *
1967  * The minimum stripe size is 64KB to ensure that a single stripe is an
1968  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
1969  * is difficult to split dirty pages across OSCs during writes.
1970  */
1971 void lod_fix_desc_stripe_size(__u64 *val)
1972 {
1973         if (*val < LOV_MIN_STRIPE_SIZE) {
1974                 if (*val != 0)
1975                         LCONSOLE_INFO("Increasing default stripe size to "
1976                                       "minimum value %u\n",
1977                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1978                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1979         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1980                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1981                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
1982                               "multiple of %u)\n",
1983                               *val, LOV_MIN_STRIPE_SIZE);
1984         }
1985 }
1986
1987 /**
1988  * set the filesystem default number of stripes, if unset.
1989  *
1990  * \param[in,out] val   number of stripes
1991  *
1992  * A value of "0" means "use the system-wide default stripe count", which
1993  * has either been inherited by now, or falls back to 1 stripe per file.
1994  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
1995  * and is a valid value, so is left unchanged here.
1996  */
1997 void lod_fix_desc_stripe_count(__u32 *val)
1998 {
1999         if (*val == 0)
2000                 *val = 1;
2001 }
2002
2003 /**
2004  * set the filesystem default layout pattern
2005  *
2006  * \param[in,out] val   LOV_PATTERN_* layout
2007  *
2008  * A value of "0" means "use the system-wide default layout type", which
2009  * has either been inherited by now, or falls back to plain RAID0 striping.
2010  */
2011 void lod_fix_desc_pattern(__u32 *val)
2012 {
2013         /* from lov_setstripe */
2014         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2015                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2016                 *val = 0;
2017         }
2018 }
2019
2020 void lod_fix_lmv_desc_pattern(__u32 *val)
2021 {
2022         if ((*val) && !lmv_is_known_hash_type(*val)) {
2023                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2024                 *val = 0;
2025         }
2026 }
2027
2028 void lod_fix_desc_qos_maxage(__u32 *val)
2029 {
2030         /* fix qos_maxage */
2031         if (*val == 0)
2032                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2033 }
2034
2035 /**
2036  * Used to fix insane default striping.
2037  *
2038  * \param[in] desc      striping description
2039  */
2040 void lod_fix_desc(struct lov_desc *desc)
2041 {
2042         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2043         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2044         lod_fix_desc_pattern(&desc->ld_pattern);
2045         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2046 }
2047
2048 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2049 {
2050         desc->ld_active_tgt_count = 0;
2051         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2052         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2053         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2054 }
2055
2056 /**
2057  * Initialize the structures used to store pools and default striping.
2058  *
2059  * \param[in] lod       LOD device
2060  * \param[in] lcfg      configuration structure storing default striping.
2061  *
2062  * \retval              0 if initialization succeeds
2063  * \retval              negative error number on failure
2064  */
2065 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2066 {
2067         struct obd_device          *obd;
2068         struct lov_desc            *desc;
2069         int                         rc;
2070         ENTRY;
2071
2072         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2073         LASSERT(obd != NULL);
2074         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2075
2076         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2077                 CERROR("LOD setup requires a descriptor\n");
2078                 RETURN(-EINVAL);
2079         }
2080
2081         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2082
2083         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2084                 CERROR("descriptor size wrong: %d > %d\n",
2085                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2086                 RETURN(-EINVAL);
2087         }
2088
2089         if (desc->ld_magic != LOV_DESC_MAGIC) {
2090                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2091                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2092                                obd->obd_name, desc);
2093                         lustre_swab_lov_desc(desc);
2094                 } else {
2095                         CERROR("%s: Bad lov desc magic: %#x\n",
2096                                obd->obd_name, desc->ld_magic);
2097                         RETURN(-EINVAL);
2098                 }
2099         }
2100
2101         lod_fix_desc(desc);
2102
2103         desc->ld_active_tgt_count = 0;
2104         lod->lod_ost_descs.ltd_lov_desc = *desc;
2105
2106         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2107         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2108
2109         lod->lod_sp_me = LUSTRE_SP_CLI;
2110
2111         /* Set up OST pool environment */
2112         lod->lod_pool_count = 0;
2113         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2114         if (rc)
2115                 RETURN(-ENOMEM);
2116
2117         INIT_LIST_HEAD(&lod->lod_pool_list);
2118         lod->lod_pool_count = 0;
2119         rc = lod_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2120         if (rc)
2121                 GOTO(out_hash, rc);
2122
2123         rc = lod_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2124         if (rc)
2125                 GOTO(out_mdt_pool, rc);
2126
2127         rc = lod_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2128         if (rc)
2129                 GOTO(out_mdt_rr_pool, rc);
2130
2131         rc = lod_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2132         if (rc)
2133                 GOTO(out_ost_pool, rc);
2134
2135         RETURN(0);
2136
2137 out_ost_pool:
2138         lod_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2139 out_mdt_rr_pool:
2140         lod_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2141 out_mdt_pool:
2142         lod_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2143 out_hash:
2144         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2145
2146         return rc;
2147 }
2148
2149 /**
2150  * Release the structures describing the pools.
2151  *
2152  * \param[in] lod       LOD device from which we release the structures
2153  *
2154  * \retval              0 always
2155  */
2156 int lod_pools_fini(struct lod_device *lod)
2157 {
2158         struct obd_device   *obd = lod2obd(lod);
2159         struct pool_desc    *pool, *tmp;
2160         ENTRY;
2161
2162         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2163                 /* free pool structs */
2164                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2165                 /* In the function below, .hs_keycmp resolves to
2166                  * pool_hashkey_keycmp() */
2167                 /* coverity[overrun-buffer-val] */
2168                 lod_pool_del(obd, pool->pool_name);
2169         }
2170
2171         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2172         lod_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2173         lod_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2174         lod_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2175         lod_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2176
2177         RETURN(0);
2178 }