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LU-8174 misc: name open file handles as such
[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                 struct list_head kill;
80                 unsigned int idx;
81
82                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
83                        ltd->ltd_death_row);
84
85                 INIT_LIST_HEAD(&kill);
86
87                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx) {
88                         tgt_desc = LTD_TGT(ltd, idx);
89                         LASSERT(tgt_desc);
90
91                         if (!tgt_desc->ltd_reap)
92                                 continue;
93
94                         list_add(&tgt_desc->ltd_kill, &kill);
95                         LTD_TGT(ltd, idx) = NULL;
96                         /*FIXME: only support ost pool for now */
97                         if (ltd == &lod->lod_ost_descs) {
98                                 lod_ost_pool_remove(&lod->lod_pool_info, idx);
99                                 if (tgt_desc->ltd_active)
100                                         lod->lod_desc.ld_active_tgt_count--;
101                         }
102                         ltd->ltd_tgtnr--;
103                         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, idx);
104                         ltd->ltd_death_row--;
105                 }
106                 mutex_unlock(&ltd->ltd_mutex);
107                 up_read(&ltd->ltd_rw_sem);
108
109                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
110                         int rc;
111                         list_del(&tgt_desc->ltd_kill);
112                         if (ltd == &lod->lod_ost_descs) {
113                                 /* remove from QoS structures */
114                                 rc = qos_del_tgt(lod, tgt_desc);
115                                 if (rc)
116                                         CERROR("%s: qos_del_tgt(%s) failed:"
117                                                "rc = %d\n",
118                                                lod2obd(lod)->obd_name,
119                                               obd_uuid2str(&tgt_desc->ltd_uuid),
120                                                rc);
121                         }
122                         rc = obd_disconnect(tgt_desc->ltd_exp);
123                         if (rc)
124                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
125                                        lod2obd(lod)->obd_name,
126                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
127                         OBD_FREE_PTR(tgt_desc);
128                 }
129         } else {
130                 mutex_unlock(&ltd->ltd_mutex);
131                 up_read(&ltd->ltd_rw_sem);
132         }
133 }
134
135 /**
136  * Expand size of target table.
137  *
138  * When the target table is full, we have to extend the table. To do so,
139  * we allocate new memory with some reserve, move data from the old table
140  * to the new one and release memory consumed by the old table.
141  * Notice we take ltd_rw_sem exclusively to ensure atomic switch.
142  *
143  * \param[in] ltd               target table
144  * \param[in] newsize           new size of the table
145  *
146  * \retval                      0 on success
147  * \retval                      -ENOMEM if reallocation failed
148  */
149 static int ltd_bitmap_resize(struct lod_tgt_descs *ltd, __u32 newsize)
150 {
151         struct cfs_bitmap *new_bitmap, *old_bitmap = NULL;
152         int           rc = 0;
153         ENTRY;
154
155         /* grab write reference on the lod. Relocating the array requires
156          * exclusive access */
157
158         down_write(&ltd->ltd_rw_sem);
159         if (newsize <= ltd->ltd_tgts_size)
160                 /* someone else has already resize the array */
161                 GOTO(out, rc = 0);
162
163         /* allocate new bitmap */
164         new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
165         if (!new_bitmap)
166                 GOTO(out, rc = -ENOMEM);
167
168         if (ltd->ltd_tgts_size > 0) {
169                 /* the bitmap already exists, we need
170                  * to copy data from old one */
171                 cfs_bitmap_copy(new_bitmap, ltd->ltd_tgt_bitmap);
172                 old_bitmap = ltd->ltd_tgt_bitmap;
173         }
174
175         ltd->ltd_tgts_size  = newsize;
176         ltd->ltd_tgt_bitmap = new_bitmap;
177
178         if (old_bitmap)
179                 CFS_FREE_BITMAP(old_bitmap);
180
181         CDEBUG(D_CONFIG, "tgt size: %d\n", ltd->ltd_tgts_size);
182
183         EXIT;
184 out:
185         up_write(&ltd->ltd_rw_sem);
186         return rc;
187 }
188
189 /**
190  * Connect LOD to a new OSP and add it to the target table.
191  *
192  * Connect to the OSP device passed, initialize all the internal
193  * structures related to the device and add it to the target table.
194  *
195  * \param[in] env               execution environment for this thread
196  * \param[in] lod               LOD device to be connected to the new OSP
197  * \param[in] osp               name of OSP device name to be added
198  * \param[in] index             index of the new target
199  * \param[in] gen               target's generation number
200  * \param[in] tgt_index         OSP's group
201  * \param[in] type              type of device (mdc or osc)
202  * \param[in] active            state of OSP: 0 - inactive, 1 - active
203  *
204  * \retval                      0 if added successfully
205  * \retval                      negative error number on failure
206  */
207 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
208                    char *osp, unsigned index, unsigned gen, int tgt_index,
209                    char *type, int active)
210 {
211         struct obd_connect_data *data = NULL;
212         struct obd_export       *exp = NULL;
213         struct obd_device       *obd;
214         struct lu_device        *lu_dev;
215         struct dt_device        *dt_dev;
216         int                      rc;
217         struct lod_tgt_desc     *tgt_desc;
218         struct lod_tgt_descs    *ltd;
219         struct lustre_cfg       *lcfg;
220         struct obd_uuid         obd_uuid;
221         bool                    for_ost;
222         bool lock = false;
223         ENTRY;
224
225         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
226
227         if (gen <= 0) {
228                 CERROR("request to add OBD %s with invalid generation: %d\n",
229                        osp, gen);
230                 RETURN(-EINVAL);
231         }
232
233         obd_str2uuid(&obd_uuid, osp);
234
235         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
236                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
237         if (obd == NULL) {
238                 CERROR("can't find %s device\n", osp);
239                 RETURN(-EINVAL);
240         }
241
242         LASSERT(obd->obd_lu_dev != NULL);
243         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
244
245         lu_dev = obd->obd_lu_dev;
246         dt_dev = lu2dt_dev(lu_dev);
247
248         OBD_ALLOC_PTR(data);
249         if (data == NULL)
250                 GOTO(out_cleanup, rc = -ENOMEM);
251
252         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
253         data->ocd_version = LUSTRE_VERSION_CODE;
254         data->ocd_index = index;
255
256         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
257                 for_ost = true;
258                 data->ocd_connect_flags |= OBD_CONNECT_AT |
259                                            OBD_CONNECT_FULL20 |
260                                            OBD_CONNECT_INDEX |
261 #ifdef HAVE_LRU_RESIZE_SUPPORT
262                                            OBD_CONNECT_LRU_RESIZE |
263 #endif
264                                            OBD_CONNECT_MDS |
265                                            OBD_CONNECT_REQPORTAL |
266                                            OBD_CONNECT_SKIP_ORPHAN |
267                                            OBD_CONNECT_FID |
268                                            OBD_CONNECT_LVB_TYPE |
269                                            OBD_CONNECT_VERSION |
270                                            OBD_CONNECT_PINGLESS |
271                                            OBD_CONNECT_LFSCK |
272                                            OBD_CONNECT_BULK_MBITS;
273
274                 data->ocd_group = tgt_index;
275                 ltd = &lod->lod_ost_descs;
276         } else {
277                 struct obd_import *imp = obd->u.cli.cl_import;
278
279                 for_ost = false;
280                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
281                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
282                                            OBD_CONNECT_IBITS |
283                                            OBD_CONNECT_MDS_MDS |
284                                            OBD_CONNECT_FID |
285                                            OBD_CONNECT_AT |
286                                            OBD_CONNECT_FULL20 |
287                                            OBD_CONNECT_LFSCK |
288                                            OBD_CONNECT_BULK_MBITS;
289                 spin_lock(&imp->imp_lock);
290                 imp->imp_server_timeout = 1;
291                 spin_unlock(&imp->imp_lock);
292                 imp->imp_client->cli_request_portal = OUT_PORTAL;
293                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
294                       obd->obd_name);
295                 ltd = &lod->lod_mdt_descs;
296         }
297
298         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
299         OBD_FREE_PTR(data);
300         if (rc) {
301                 CERROR("%s: cannot connect to next dev %s (%d)\n",
302                        obd->obd_name, osp, rc);
303                 GOTO(out_cleanup, rc);
304         }
305
306         /* Allocate ost descriptor and fill it */
307         OBD_ALLOC_PTR(tgt_desc);
308         if (!tgt_desc)
309                 GOTO(out_conn, rc = -ENOMEM);
310
311         tgt_desc->ltd_tgt    = dt_dev;
312         tgt_desc->ltd_exp    = exp;
313         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
314         tgt_desc->ltd_gen    = gen;
315         tgt_desc->ltd_index  = index;
316         tgt_desc->ltd_active = active;
317
318         lod_getref(ltd);
319         if (index >= ltd->ltd_tgts_size) {
320                 /* we have to increase the size of the lod_osts array */
321                 __u32  newsize;
322
323                 newsize = max(ltd->ltd_tgts_size, (__u32)2);
324                 while (newsize < index + 1)
325                         newsize = newsize << 1;
326
327                 /* lod_bitmap_resize() needs lod_rw_sem
328                  * which we hold with th reference */
329                 lod_putref(lod, ltd);
330
331                 rc = ltd_bitmap_resize(ltd, newsize);
332                 if (rc)
333                         GOTO(out_desc, rc);
334
335                 lod_getref(ltd);
336         }
337
338         mutex_lock(&ltd->ltd_mutex);
339         lock = true;
340         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
341                 CERROR("%s: device %d is registered already\n", obd->obd_name,
342                        index);
343                 GOTO(out_mutex, rc = -EEXIST);
344         }
345
346         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
347                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
348                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
349                         CERROR("can't allocate index to add %s\n",
350                                obd->obd_name);
351                         GOTO(out_mutex, rc = -ENOMEM);
352                 }
353         }
354
355         if (for_ost) {
356                 /* pool and qos are not supported for MDS stack yet */
357                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
358                                       lod->lod_osts_size);
359                 if (rc) {
360                         CERROR("%s: can't set up pool, failed with %d\n",
361                                obd->obd_name, rc);
362                         GOTO(out_mutex, rc);
363                 }
364
365                 rc = qos_add_tgt(lod, tgt_desc);
366                 if (rc) {
367                         CERROR("%s: qos_add_tgt failed with %d\n",
368                                 obd->obd_name, rc);
369                         GOTO(out_pool, rc);
370                 }
371
372                 /* The new OST is now a full citizen */
373                 if (index >= lod->lod_desc.ld_tgt_count)
374                         lod->lod_desc.ld_tgt_count = index + 1;
375                 if (active)
376                         lod->lod_desc.ld_active_tgt_count++;
377         }
378
379         LTD_TGT(ltd, index) = tgt_desc;
380         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
381         ltd->ltd_tgtnr++;
382         mutex_unlock(&ltd->ltd_mutex);
383         lod_putref(lod, ltd);
384         lock = false;
385         if (lod->lod_recovery_completed)
386                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
387
388         if (!for_ost && lod->lod_initialized) {
389                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
390                 if (rc != 0) {
391                         CERROR("%s: cannot start llog on %s:rc = %d\n",
392                                lod2obd(lod)->obd_name, osp, rc);
393                         GOTO(out_ltd, rc);
394                 }
395         }
396
397         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
398         if (rc != 0) {
399                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
400                        "index = %u, rc = %d\n", osp, type, index, rc);
401                 GOTO(out_fini_llog, rc);
402         }
403         RETURN(rc);
404 out_fini_llog:
405         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
406                           tgt_desc->ltd_recovery_thread);
407 out_ltd:
408         lod_getref(ltd);
409         mutex_lock(&ltd->ltd_mutex);
410         lock = true;
411         if (!for_ost && LTD_TGT(ltd, index)->ltd_recovery_thread != NULL) {
412                 struct ptlrpc_thread *thread;
413
414                 thread = LTD_TGT(ltd, index)->ltd_recovery_thread;
415                 OBD_FREE_PTR(thread);
416         }
417         ltd->ltd_tgtnr--;
418         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, index);
419         LTD_TGT(ltd, index) = NULL;
420 out_pool:
421         lod_ost_pool_remove(&lod->lod_pool_info, index);
422 out_mutex:
423         if (lock) {
424                 mutex_unlock(&ltd->ltd_mutex);
425                 lod_putref(lod, ltd);
426         }
427 out_desc:
428         OBD_FREE_PTR(tgt_desc);
429 out_conn:
430         obd_disconnect(exp);
431 out_cleanup:
432         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
433          * objects from the MDT stack. See LU-7184. */
434         lcfg = &lod_env_info(env)->lti_lustre_cfg;
435         memset(lcfg, 0, sizeof(*lcfg));
436         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
437         lcfg->lcfg_command = LCFG_CLEANUP;
438         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
439
440         return rc;
441 }
442
443 /**
444  * Schedule target removal from the target table.
445  *
446  * Mark the device as dead. The device is not removed here because it may
447  * still be in use. The device will be removed in lod_putref() when the
448  * last reference is released.
449  *
450  * \param[in] env               execution environment for this thread
451  * \param[in] lod               LOD device the target table belongs to
452  * \param[in] ltd               target table
453  * \param[in] idx               index of the target
454  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
455  */
456 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
457                              struct lod_tgt_descs *ltd, unsigned idx,
458                              bool for_ost)
459 {
460         LASSERT(LTD_TGT(ltd, idx));
461
462         lfsck_del_target(env, lod->lod_child, LTD_TGT(ltd, idx)->ltd_tgt,
463                          idx, for_ost);
464
465         if (!for_ost && LTD_TGT(ltd, idx)->ltd_recovery_thread != NULL) {
466                 struct ptlrpc_thread *thread;
467
468                 thread = LTD_TGT(ltd, idx)->ltd_recovery_thread;
469                 OBD_FREE_PTR(thread);
470         }
471
472         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
473                 LTD_TGT(ltd, idx)->ltd_reap = 1;
474                 ltd->ltd_death_row++;
475         }
476 }
477
478 /**
479  * Schedule removal of all the targets from the given target table.
480  *
481  * See more details in the description for __lod_del_device()
482  *
483  * \param[in] env               execution environment for this thread
484  * \param[in] lod               LOD device the target table belongs to
485  * \param[in] ltd               target table
486  * \param[in] for_ost           type of the target: MDT or OST
487  *
488  * \retval                      0 always
489  */
490 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
491                  struct lod_tgt_descs *ltd, bool for_ost)
492 {
493         unsigned int idx;
494
495         if (ltd->ltd_tgts_size <= 0)
496                 return 0;
497         lod_getref(ltd);
498         mutex_lock(&ltd->ltd_mutex);
499         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
500                 __lod_del_device(env, lod, ltd, idx, for_ost);
501         mutex_unlock(&ltd->ltd_mutex);
502         lod_putref(lod, ltd);
503         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
504         for (idx = 0; idx < TGT_PTRS; idx++) {
505                 if (ltd->ltd_tgt_idx[idx])
506                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
507         }
508         ltd->ltd_tgts_size = 0;
509         return 0;
510 }
511
512 /**
513  * Remove device by name.
514  *
515  * Remove a device identified by \a osp from the target table. Given
516  * the device can be in use, the real deletion happens in lod_putref().
517  *
518  * \param[in] env               execution environment for this thread
519  * \param[in] lod               LOD device to be connected to the new OSP
520  * \param[in] ltd               target table
521  * \param[in] osp               name of OSP device to be removed
522  * \param[in] idx               index of the target
523  * \param[in] gen               generation number, not used currently
524  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
525  *
526  * \retval                      0 if the device was scheduled for removal
527  * \retval                      -EINVAL if no device was found
528  */
529 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
530                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
531                    unsigned gen, bool for_ost)
532 {
533         struct obd_device *obd;
534         int                rc = 0;
535         struct obd_uuid    uuid;
536         ENTRY;
537
538         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
539
540         obd_str2uuid(&uuid, osp);
541
542         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
543                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
544         if (obd == NULL) {
545                 CERROR("can't find %s device\n", osp);
546                 RETURN(-EINVAL);
547         }
548
549         if (gen <= 0) {
550                 CERROR("%s: request to remove OBD %s with invalid generation %d"
551                        "\n", obd->obd_name, osp, gen);
552                 RETURN(-EINVAL);
553         }
554
555         obd_str2uuid(&uuid,  osp);
556
557         lod_getref(ltd);
558         mutex_lock(&ltd->ltd_mutex);
559         /* check that the index is allocated in the bitmap */
560         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
561             !LTD_TGT(ltd, idx)) {
562                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
563                 GOTO(out, rc = -EINVAL);
564         }
565
566         /* check that the UUID matches */
567         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
568                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
569                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
570                        idx, osp);
571                 GOTO(out, rc = -EINVAL);
572         }
573
574         __lod_del_device(env, lod, ltd, idx, for_ost);
575         EXIT;
576 out:
577         mutex_unlock(&ltd->ltd_mutex);
578         lod_putref(lod, ltd);
579         return(rc);
580 }
581
582 /**
583  * Resize per-thread storage to hold specified size.
584  *
585  * A helper function to resize per-thread temporary storage. This storage
586  * is used to process LOV/LVM EAs and may be quite large. We do not want to
587  * allocate/release it every time, so instead we put it into the env and
588  * reallocate on demand. The memory is released when the correspondent thread
589  * is finished.
590  *
591  * \param[in] info              LOD-specific storage in the environment
592  * \param[in] size              new size to grow the buffer to
593
594  * \retval                      0 on success, -ENOMEM if reallocation failed
595  */
596 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
597 {
598         __u32 round = size_roundup_power2(size);
599
600         LASSERT(round <=
601                 lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
602         if (info->lti_ea_store) {
603                 LASSERT(info->lti_ea_store_size);
604                 LASSERT(info->lti_ea_store_size < round);
605                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
606                        info->lti_ea_store_size, round);
607                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
608                 info->lti_ea_store = NULL;
609                 info->lti_ea_store_size = 0;
610         }
611
612         OBD_ALLOC_LARGE(info->lti_ea_store, round);
613         if (info->lti_ea_store == NULL)
614                 RETURN(-ENOMEM);
615         info->lti_ea_store_size = round;
616
617         RETURN(0);
618 }
619
620 static void lod_free_comp_buffer(struct lod_layout_component *entries,
621                                  __u16 count, __u32 bufsize)
622 {
623         struct lod_layout_component *entry;
624         int i;
625
626         for (i = 0; i < count; i++) {
627                 entry = &entries[i];
628                 if (entry->llc_pool != NULL)
629                         lod_set_pool(&entry->llc_pool, NULL);
630                 if (entry->llc_ostlist.op_array)
631                         OBD_FREE(entry->llc_ostlist.op_array,
632                                  entry->llc_ostlist.op_size);
633                 LASSERT(entry->llc_stripe == NULL);
634                 LASSERT(entry->llc_stripes_allocated == 0);
635         }
636
637         if (bufsize != 0)
638                 OBD_FREE_LARGE(entries, bufsize);
639 }
640
641 void lod_free_def_comp_entries(struct lod_default_striping *lds)
642 {
643         lod_free_comp_buffer(lds->lds_def_comp_entries,
644                              lds->lds_def_comp_size_cnt,
645                              size_roundup_power2(
646                                      sizeof(*lds->lds_def_comp_entries) *
647                                      lds->lds_def_comp_size_cnt));
648         lds->lds_def_comp_entries = NULL;
649         lds->lds_def_comp_cnt = 0;
650         lds->lds_def_striping_is_composite = 0;
651         lds->lds_def_comp_size_cnt = 0;
652 }
653
654 /**
655  * Resize per-thread storage to hold default striping component entries
656  *
657  * A helper function to resize per-thread temporary storage. This storage
658  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
659  * to allocate/release it every time, so instead we put it into the env and
660  * reallocate it on demand. The memory is released when the correspondent
661  * thread is finished.
662  *
663  * \param[in,out] lds           default striping
664  * \param[in] count             new component count to grow the buffer to
665
666  * \retval                      0 on success, -ENOMEM if reallocation failed
667  */
668 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
669 {
670         struct lod_layout_component *entries;
671         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
672                                         count);
673         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
674                                         lds->lds_def_comp_size_cnt);
675
676         if (new <= old)
677                 return 0;
678
679         OBD_ALLOC_LARGE(entries, new);
680         if (entries == NULL)
681                 return -ENOMEM;
682
683         if (lds->lds_def_comp_entries != NULL) {
684                 CDEBUG(D_INFO, "default striping component size %d is not "
685                        "enough, need %d\n", old, new);
686                 lod_free_def_comp_entries(lds);
687         }
688
689         lds->lds_def_comp_entries = entries;
690         lds->lds_def_comp_size_cnt = count;
691
692         RETURN(0);
693 }
694
695 void lod_free_comp_entries(struct lod_object *lo)
696 {
697         if (lo->ldo_mirrors) {
698                 OBD_FREE(lo->ldo_mirrors,
699                          sizeof(*lo->ldo_mirrors) * lo->ldo_mirror_count);
700                 lo->ldo_mirrors = NULL;
701                 lo->ldo_mirror_count = 0;
702         }
703         lod_free_comp_buffer(lo->ldo_comp_entries,
704                              lo->ldo_comp_cnt,
705                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
706         lo->ldo_comp_entries = NULL;
707         lo->ldo_comp_cnt = 0;
708         lo->ldo_is_composite = 0;
709 }
710
711 int lod_alloc_comp_entries(struct lod_object *lo,
712                            int mirror_count, int comp_count)
713 {
714         LASSERT(comp_count != 0);
715         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
716
717         if (mirror_count > 0) {
718                 OBD_ALLOC(lo->ldo_mirrors,
719                           sizeof(*lo->ldo_mirrors) * mirror_count);
720                 if (!lo->ldo_mirrors)
721                         return -ENOMEM;
722
723                 lo->ldo_mirror_count = mirror_count;
724         }
725
726         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
727                         sizeof(*lo->ldo_comp_entries) * comp_count);
728         if (lo->ldo_comp_entries == NULL) {
729                 OBD_FREE(lo->ldo_mirrors,
730                          sizeof(*lo->ldo_mirrors) * mirror_count);
731                 lo->ldo_mirror_count = 0;
732                 return -ENOMEM;
733         }
734
735         lo->ldo_comp_cnt = comp_count;
736         return 0;
737 }
738
739 int lod_fill_mirrors(struct lod_object *lo)
740 {
741         struct lod_layout_component *lod_comp;
742         int mirror_idx = -1;
743         __u16 mirror_id = 0xffff;
744         int i;
745         ENTRY;
746
747         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
748
749         if (!lo->ldo_is_composite)
750                 RETURN(0);
751
752         lod_comp = &lo->ldo_comp_entries[0];
753         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
754                 int stale = !!(lod_comp->llc_flags & LCME_FL_STALE);
755                 int preferred = !!(lod_comp->llc_flags & LCME_FL_PREF_WR);
756
757                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
758                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
759                         lo->ldo_mirrors[mirror_idx].lme_primary |= preferred;
760                         lo->ldo_mirrors[mirror_idx].lme_end = i;
761                         continue;
762                 }
763
764                 /* new mirror */
765                 ++mirror_idx;
766                 if (mirror_idx >= lo->ldo_mirror_count)
767                         RETURN(-EINVAL);
768
769                 mirror_id = mirror_id_of(lod_comp->llc_id);
770
771                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
772                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
773                 lo->ldo_mirrors[mirror_idx].lme_primary = preferred;
774                 lo->ldo_mirrors[mirror_idx].lme_start = i;
775                 lo->ldo_mirrors[mirror_idx].lme_end = i;
776         }
777         if (mirror_idx != lo->ldo_mirror_count - 1)
778                 RETURN(-EINVAL);
779
780         RETURN(0);
781 }
782
783 /**
784  * Generate on-disk lov_mds_md structure for each layout component based on
785  * the information in lod_object->ldo_comp_entries[i].
786  *
787  * \param[in] env               execution environment for this thread
788  * \param[in] lo                LOD object
789  * \param[in] comp_idx          index of ldo_comp_entries
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 static int lod_gen_component_ea(const struct lu_env *env,
802                                 struct lod_object *lo, int comp_idx,
803                                 struct lov_mds_md *lmm, int *lmm_size,
804                                 bool is_dir)
805 {
806         struct lod_thread_info  *info = lod_env_info(env);
807         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
808         struct lod_device       *lod;
809         struct lov_ost_data_v1  *objs;
810         struct lod_layout_component *lod_comp;
811         __u32   magic;
812         __u16 stripe_count;
813         int     i, rc = 0;
814         ENTRY;
815
816         LASSERT(lo);
817         if (is_dir)
818                 lod_comp =
819                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
820         else
821                 lod_comp = &lo->ldo_comp_entries[comp_idx];
822
823         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
824         if (lod_comp->llc_pattern == 0) /* default striping */
825                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
826
827         lmm->lmm_magic = cpu_to_le32(magic);
828         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
829         fid_to_lmm_oi(fid, &lmm->lmm_oi);
830         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
831                 lmm->lmm_oi.oi.oi_id++;
832         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
833
834         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
835         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
836         /**
837          * for dir and uninstantiated component, lmm_layout_gen stores
838          * default stripe offset.
839          */
840         lmm->lmm_layout_gen =
841                 (is_dir || !lod_comp_inited(lod_comp)) ?
842                         cpu_to_le16(lod_comp->llc_stripe_offset) :
843                         cpu_to_le16(lod_comp->llc_layout_gen);
844
845         if (magic == LOV_MAGIC_V1) {
846                 objs = &lmm->lmm_objects[0];
847         } else {
848                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
849                 size_t cplen = strlcpy(v3->lmm_pool_name,
850                                        lod_comp->llc_pool,
851                                        sizeof(v3->lmm_pool_name));
852                 if (cplen >= sizeof(v3->lmm_pool_name))
853                         RETURN(-E2BIG);
854                 objs = &v3->lmm_objects[0];
855         }
856         stripe_count = lod_comp_entry_stripe_count(lo, lod_comp, is_dir);
857         if (!is_dir && lo->ldo_is_composite)
858                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
859
860         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
861                 GOTO(done, rc = 0);
862
863         /* generate ost_idx of this component stripe */
864         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
865         for (i = 0; i < stripe_count; i++) {
866                 struct dt_object *object;
867                 __u32 ost_idx = (__u32)-1UL;
868                 int type = LU_SEQ_RANGE_OST;
869
870                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
871                         object = lod_comp->llc_stripe[i];
872                         /* instantiated component */
873                         info->lti_fid = *lu_object_fid(&object->do_lu);
874
875                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
876                             comp_idx == 0) {
877                                 if (cfs_fail_val == 0)
878                                         cfs_fail_val = info->lti_fid.f_oid;
879                                 else if (i == 0)
880                                         info->lti_fid.f_oid = cfs_fail_val;
881                         }
882
883                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
884                         LASSERT(rc == 0);
885
886                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
887                         objs[i].l_ost_gen = cpu_to_le32(0);
888                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
889                                 rc = -ENOENT;
890                         else
891                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
892                                                     &ost_idx, &type);
893                         if (rc < 0) {
894                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
895                                        lod2obd(lod)->obd_name,
896                                        PFID(&info->lti_fid), rc);
897                                 RETURN(rc);
898                         }
899                 } else if (lod_comp->llc_ostlist.op_array &&
900                            lod_comp->llc_ostlist.op_count) {
901                         /* user specified ost list */
902                         ost_idx = lod_comp->llc_ostlist.op_array[i];
903                 }
904                 /*
905                  * with un-instantiated or with no specified ost list
906                  * component, its l_ost_idx does not matter.
907                  */
908                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
909         }
910 done:
911         if (lmm_size != NULL)
912                 *lmm_size = lov_mds_md_size(stripe_count, magic);
913         RETURN(rc);
914 }
915
916 /**
917  * Generate on-disk lov_mds_md structure based on the information in
918  * the lod_object->ldo_comp_entries.
919  *
920  * \param[in] env               execution environment for this thread
921  * \param[in] lo                LOD object
922  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
923  * \param[in|out] lmm_size      buffer size/lmm size
924  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
925  *                              the stripe info is from the default stripe
926  *                              template, which is collected in lod_ah_init(),
927  *                              either from parent object or root object; for
928  *                              file case, it's from the @lo object
929  *
930  * \retval                      0 if on disk structure is created successfully
931  * \retval                      negative error number on failure
932  */
933 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
934                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
935 {
936         struct lov_comp_md_entry_v1 *lcme;
937         struct lov_comp_md_v1 *lcm;
938         struct lod_layout_component *comp_entries;
939         __u16 comp_cnt, mirror_cnt;
940         bool is_composite;
941         int i, rc = 0, offset;
942         ENTRY;
943
944         if (is_dir) {
945                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
946                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
947                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
948                 is_composite =
949                         lo->ldo_def_striping->lds_def_striping_is_composite;
950         } else {
951                 comp_cnt = lo->ldo_comp_cnt;
952                 mirror_cnt = lo->ldo_mirror_count;
953                 comp_entries = lo->ldo_comp_entries;
954                 is_composite = lo->ldo_is_composite;
955         }
956
957         LASSERT(lmm_size != NULL);
958         LASSERT(comp_cnt != 0 && comp_entries != NULL);
959
960         if (!is_composite) {
961                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
962                 RETURN(rc);
963         }
964
965         lcm = (struct lov_comp_md_v1 *)lmm;
966         memset(lcm, 0, sizeof(*lcm));
967
968         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
969         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
970         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
971         lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
972
973         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
974         LASSERT(offset % sizeof(__u64) == 0);
975
976         for (i = 0; i < comp_cnt; i++) {
977                 struct lod_layout_component *lod_comp;
978                 struct lov_mds_md *sub_md;
979                 int size;
980
981                 lod_comp = &comp_entries[i];
982                 lcme = &lcm->lcm_entries[i];
983
984                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
985                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
986
987                 /* component could be un-inistantiated */
988                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
989                 lcme->lcme_extent.e_start =
990                         cpu_to_le64(lod_comp->llc_extent.e_start);
991                 lcme->lcme_extent.e_end =
992                         cpu_to_le64(lod_comp->llc_extent.e_end);
993                 lcme->lcme_offset = cpu_to_le32(offset);
994
995                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
996                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
997                 if (rc)
998                         GOTO(out, rc);
999                 lcme->lcme_size = cpu_to_le32(size);
1000                 offset += size;
1001                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
1002                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
1003         }
1004         lcm->lcm_size = cpu_to_le32(offset);
1005         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
1006
1007         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
1008                              "generate lum");
1009 out:
1010         if (rc == 0)
1011                 *lmm_size = offset;
1012         RETURN(rc);
1013 }
1014
1015 /**
1016  * Get LOV EA.
1017  *
1018  * Fill lti_ea_store buffer in the environment with a value for the given
1019  * EA. The buffer is reallocated if the value doesn't fit.
1020  *
1021  * \param[in,out] env           execution environment for this thread
1022  *                              .lti_ea_store buffer is filled with EA's value
1023  * \param[in] lo                LOD object
1024  * \param[in] name              name of the EA
1025  *
1026  * \retval                      > 0 if EA is fetched successfully
1027  * \retval                      0 if EA is empty
1028  * \retval                      negative error number on failure
1029  */
1030 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
1031                const char *name)
1032 {
1033         struct lod_thread_info  *info = lod_env_info(env);
1034         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1035         int                     rc;
1036         ENTRY;
1037
1038         LASSERT(info);
1039
1040         if (unlikely(info->lti_ea_store == NULL)) {
1041                 /* just to enter in allocation block below */
1042                 rc = -ERANGE;
1043         } else {
1044 repeat:
1045                 info->lti_buf.lb_buf = info->lti_ea_store;
1046                 info->lti_buf.lb_len = info->lti_ea_store_size;
1047                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
1048         }
1049
1050         /* if object is not striped or inaccessible */
1051         if (rc == -ENODATA || rc == -ENOENT)
1052                 RETURN(0);
1053
1054         if (rc == -ERANGE) {
1055                 /* EA doesn't fit, reallocate new buffer */
1056                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1057                 if (rc == -ENODATA || rc == -ENOENT)
1058                         RETURN(0);
1059                 else if (rc < 0)
1060                         RETURN(rc);
1061
1062                 LASSERT(rc > 0);
1063                 rc = lod_ea_store_resize(info, rc);
1064                 if (rc)
1065                         RETURN(rc);
1066                 goto repeat;
1067         }
1068
1069         RETURN(rc);
1070 }
1071
1072 /**
1073  * Verify the target index is present in the current configuration.
1074  *
1075  * \param[in] md                LOD device where the target table is stored
1076  * \param[in] idx               target's index
1077  *
1078  * \retval                      0 if the index is present
1079  * \retval                      -EINVAL if not
1080  */
1081 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1082 {
1083         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1084                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
1085                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1086                        md->lod_ost_descs.ltd_tgts_size);
1087                 return -EINVAL;
1088         }
1089
1090         if (unlikely(OST_TGT(md, idx) == NULL)) {
1091                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1092                        lod2obd(md)->obd_name, idx);
1093                 return -EINVAL;
1094         }
1095
1096         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
1097                 CERROR("%s: invalid lod device, for idx: %d\n",
1098                        lod2obd(md)->obd_name , idx);
1099                 return -EINVAL;
1100         }
1101
1102         return 0;
1103 }
1104
1105 /**
1106  * Instantiate objects for stripes.
1107  *
1108  * Allocate and initialize LU-objects representing the stripes. The number
1109  * of the stripes (ldo_stripe_count) must be initialized already. The caller
1110  * must ensure nobody else is calling the function on the object at the same
1111  * time. FLDB service must be running to be able to map a FID to the targets
1112  * and find appropriate device representing that target.
1113  *
1114  * \param[in] env               execution environment for this thread
1115  * \param[in,out] lo            LOD object
1116  * \param[in] objs              an array of IDs to creates the objects from
1117  * \param[in] comp_idx          index of ldo_comp_entries
1118  *
1119  * \retval                      0 if the objects are instantiated successfully
1120  * \retval                      negative error number on failure
1121  */
1122 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1123                            struct lov_ost_data_v1 *objs, int comp_idx)
1124 {
1125         struct lod_layout_component *lod_comp;
1126         struct lod_thread_info *info = lod_env_info(env);
1127         struct lod_device *md;
1128         struct lu_object *o, *n;
1129         struct lu_device *nd;
1130         struct dt_object **stripe = NULL;
1131         __u32 *ost_indices = NULL;
1132         int stripe_len;
1133         int i, rc = 0;
1134         __u32 idx;
1135         ENTRY;
1136
1137         LASSERT(lo != NULL);
1138         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1139
1140         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1141         lod_comp = &lo->ldo_comp_entries[comp_idx];
1142
1143         LASSERT(lod_comp->llc_stripe == NULL);
1144         LASSERT(lod_comp->llc_stripe_count > 0);
1145         LASSERT(lod_comp->llc_stripe_size > 0);
1146
1147         stripe_len = lod_comp->llc_stripe_count;
1148         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
1149         if (stripe == NULL)
1150                 RETURN(-ENOMEM);
1151         OBD_ALLOC(ost_indices, sizeof(*ost_indices) * stripe_len);
1152         if (!ost_indices)
1153                 GOTO(out, rc = -ENOMEM);
1154
1155         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1156                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1157                         continue;
1158
1159                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1160                 idx = le32_to_cpu(objs[i].l_ost_idx);
1161                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1162                 if (rc != 0)
1163                         GOTO(out, rc);
1164                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1165                          PFID(&info->lti_fid));
1166                 lod_getref(&md->lod_ost_descs);
1167
1168                 rc = validate_lod_and_idx(md, idx);
1169                 if (unlikely(rc != 0)) {
1170                         lod_putref(md, &md->lod_ost_descs);
1171                         GOTO(out, rc);
1172                 }
1173
1174                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
1175                 lod_putref(md, &md->lod_ost_descs);
1176
1177                 /* In the function below, .hs_keycmp resolves to
1178                  * u_obj_hop_keycmp() */
1179                 /* coverity[overrun-buffer-val] */
1180                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1181                 if (IS_ERR(o))
1182                         GOTO(out, rc = PTR_ERR(o));
1183
1184                 n = lu_object_locate(o->lo_header, nd->ld_type);
1185                 LASSERT(n);
1186
1187                 stripe[i] = container_of(n, struct dt_object, do_lu);
1188                 ost_indices[i] = idx;
1189         }
1190
1191 out:
1192         if (rc != 0) {
1193                 for (i = 0; i < stripe_len; i++)
1194                         if (stripe[i] != NULL)
1195                                 dt_object_put(env, stripe[i]);
1196
1197                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
1198                 lod_comp->llc_stripe_count = 0;
1199                 if (ost_indices)
1200                         OBD_FREE(ost_indices,
1201                                  sizeof(*ost_indices) * stripe_len);
1202         } else {
1203                 lod_comp->llc_stripe = stripe;
1204                 lod_comp->llc_ost_indices = ost_indices;
1205                 lod_comp->llc_stripes_allocated = stripe_len;
1206         }
1207
1208         RETURN(rc);
1209 }
1210
1211 /**
1212  * Instantiate objects for striping.
1213  *
1214  * Parse striping information in \a buf and instantiate the objects
1215  * representing the stripes.
1216  *
1217  * \param[in] env               execution environment for this thread
1218  * \param[in] lo                LOD object
1219  * \param[in] buf               buffer storing LOV EA to parse
1220  *
1221  * \retval                      0 if parsing and objects creation succeed
1222  * \retval                      negative error number on failure
1223  */
1224 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1225                        const struct lu_buf *buf)
1226 {
1227         struct lov_mds_md_v1    *lmm;
1228         struct lov_comp_md_v1   *comp_v1 = NULL;
1229         struct lov_ost_data_v1  *objs;
1230         __u32   magic, pattern;
1231         int     i, j, rc = 0;
1232         __u16   comp_cnt;
1233         __u16   mirror_cnt = 0;
1234         ENTRY;
1235
1236         LASSERT(buf);
1237         LASSERT(buf->lb_buf);
1238         LASSERT(buf->lb_len);
1239         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1240
1241         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1242         magic = le32_to_cpu(lmm->lmm_magic);
1243
1244         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1245             magic != LOV_MAGIC_COMP_V1)
1246                 GOTO(out, rc = -EINVAL);
1247
1248         lod_free_comp_entries(lo);
1249
1250         if (magic == LOV_MAGIC_COMP_V1) {
1251                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1252                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1253                 if (comp_cnt == 0)
1254                         GOTO(out, rc = -EINVAL);
1255                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1256                 lo->ldo_is_composite = 1;
1257                 lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1258                                         LCM_FL_FLR_MASK;
1259                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1260         } else {
1261                 comp_cnt = 1;
1262                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1263                 lo->ldo_is_composite = 0;
1264         }
1265
1266         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1267         if (rc)
1268                 GOTO(out, rc);
1269
1270         for (i = 0; i < comp_cnt; i++) {
1271                 struct lod_layout_component     *lod_comp;
1272                 struct lu_extent        *ext;
1273                 __u32   offs;
1274
1275                 lod_comp = &lo->ldo_comp_entries[i];
1276                 if (lo->ldo_is_composite) {
1277                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1278                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1279                         magic = le32_to_cpu(lmm->lmm_magic);
1280
1281                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1282                         lod_comp->llc_extent.e_start =
1283                                 le64_to_cpu(ext->e_start);
1284                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1285                         lod_comp->llc_flags =
1286                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1287                         lod_comp->llc_id =
1288                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1289                         if (lod_comp->llc_id == LCME_ID_INVAL)
1290                                 GOTO(out, rc = -EINVAL);
1291                 } else {
1292                         lod_comp_set_init(lod_comp);
1293                 }
1294
1295                 pattern = le32_to_cpu(lmm->lmm_pattern);
1296                 if (lov_pattern(pattern) != LOV_PATTERN_RAID0 &&
1297                     lov_pattern(pattern) != LOV_PATTERN_MDT)
1298                         GOTO(out, rc = -EINVAL);
1299
1300                 lod_comp->llc_pattern = pattern;
1301                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1302                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1303                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1304
1305                 if (magic == LOV_MAGIC_V3) {
1306                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1307                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1308                         objs = &v3->lmm_objects[0];
1309                 } else {
1310                         lod_set_pool(&lod_comp->llc_pool, NULL);
1311                         objs = &lmm->lmm_objects[0];
1312                 }
1313
1314                 /**
1315                  * If uninstantiated template component has valid l_ost_idx,
1316                  * then user has specified ost list for this component.
1317                  */
1318                 if (!lod_comp_inited(lod_comp)) {
1319                         __u16 stripe_count;
1320
1321                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1322                                 stripe_count = lod_comp_entry_stripe_count(
1323                                                         lo, lod_comp, false);
1324                                 /**
1325                                  * load the user specified ost list, when this
1326                                  * component is instantiated later, it will be
1327                                  * used in lod_alloc_ost_list().
1328                                  */
1329                                 lod_comp->llc_ostlist.op_count = stripe_count;
1330                                 lod_comp->llc_ostlist.op_size =
1331                                         stripe_count * sizeof(__u32);
1332                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1333                                           lod_comp->llc_ostlist.op_size);
1334                                 if (!lod_comp->llc_ostlist.op_array)
1335                                         GOTO(out, rc = -ENOMEM);
1336
1337                                 for (j = 0; j < stripe_count; j++)
1338                                         lod_comp->llc_ostlist.op_array[j] =
1339                                                 le32_to_cpu(objs[j].l_ost_idx);
1340
1341                                 /**
1342                                  * this component OST objects starts from the
1343                                  * first ost_idx, lod_alloc_ost_list() will
1344                                  * check this.
1345                                  */
1346                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1347                         } else {
1348                                 /**
1349                                  * for uninstantiated component,
1350                                  * lmm_layout_gen stores default stripe offset.
1351                                  */
1352                                 lod_comp->llc_stripe_offset =
1353                                                         lmm->lmm_layout_gen;
1354                         }
1355                 }
1356
1357                 /* skip un-instantiated component object initialization */
1358                 if (!lod_comp_inited(lod_comp))
1359                         continue;
1360
1361                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1362                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1363                         rc = lod_initialize_objects(env, lo, objs, i);
1364                         if (rc)
1365                                 GOTO(out, rc);
1366                 }
1367         }
1368
1369         rc = lod_fill_mirrors(lo);
1370         if (rc)
1371                 GOTO(out, rc);
1372
1373 out:
1374         if (rc)
1375                 lod_striping_free_nolock(env, lo);
1376         RETURN(rc);
1377 }
1378
1379 /**
1380  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1381  * is already cached.
1382  *
1383  * \param[in] lo        LOD object
1384  *
1385  * \retval              True if the striping is cached, otherwise
1386  *                      return false.
1387  */
1388 static bool lod_striping_loaded(struct lod_object *lo)
1389 {
1390         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1391             lo->ldo_comp_cached)
1392                 return true;
1393
1394         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1395                 if (lo->ldo_dir_stripe_loaded)
1396                         return true;
1397
1398                 /* Never load LMV stripe for slaves of striped dir */
1399                 if (lo->ldo_dir_slave_stripe)
1400                         return true;
1401         }
1402
1403         return false;
1404 }
1405
1406 /**
1407  * A generic function to initialize the stripe objects.
1408  *
1409  * A protected version of lod_striping_load_locked() - load the striping
1410  * information from storage, parse that and instantiate LU objects to
1411  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1412  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1413  * return an array of references to the newly instantiated objects.
1414  *
1415  * \param[in] env               execution environment for this thread
1416  * \param[in,out] lo            LOD object, where striping is stored and
1417  *                              which gets an array of references
1418  *
1419  * \retval                      0 if parsing and object creation succeed
1420  * \retval                      negative error number on failure
1421  **/
1422 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1423 {
1424         struct lod_thread_info *info = lod_env_info(env);
1425         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1426         struct lu_buf *buf = &info->lti_buf;
1427         int rc = 0;
1428
1429         ENTRY;
1430
1431         if (!dt_object_exists(next))
1432                 RETURN(0);
1433
1434         if (lod_striping_loaded(lo))
1435                 RETURN(0);
1436
1437         mutex_lock(&lo->ldo_layout_mutex);
1438         if (lod_striping_loaded(lo))
1439                 GOTO(unlock, rc = 0);
1440
1441         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1442                 rc = lod_get_lov_ea(env, lo);
1443                 if (rc <= 0)
1444                         GOTO(unlock, rc);
1445
1446                 /*
1447                  * there is LOV EA (striping information) in this object
1448                  * let's parse it and create in-core objects for the stripes
1449                  */
1450                 buf->lb_buf = info->lti_ea_store;
1451                 buf->lb_len = info->lti_ea_store_size;
1452                 rc = lod_parse_striping(env, lo, buf);
1453                 if (rc == 0)
1454                         lo->ldo_comp_cached = 1;
1455         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1456                 rc = lod_get_lmv_ea(env, lo);
1457                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1)) {
1458                         /* Let's set stripe_loaded to avoid further
1459                          * stripe loading especially for non-stripe directory,
1460                          * which can hurt performance. (See LU-9840)
1461                          */
1462                         if (rc == 0)
1463                                 lo->ldo_dir_stripe_loaded = 1;
1464                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1465                 }
1466                 buf->lb_buf = info->lti_ea_store;
1467                 buf->lb_len = info->lti_ea_store_size;
1468                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1469                         rc = lod_load_lmv_shards(env, lo, buf, true);
1470                         if (buf->lb_buf != info->lti_ea_store) {
1471                                 OBD_FREE_LARGE(info->lti_ea_store,
1472                                                info->lti_ea_store_size);
1473                                 info->lti_ea_store = buf->lb_buf;
1474                                 info->lti_ea_store_size = buf->lb_len;
1475                         }
1476
1477                         if (rc < 0)
1478                                 GOTO(unlock, rc);
1479                 }
1480
1481                 /*
1482                  * there is LMV EA (striping information) in this object
1483                  * let's parse it and create in-core objects for the stripes
1484                  */
1485                 rc = lod_parse_dir_striping(env, lo, buf);
1486                 if (rc == 0)
1487                         lo->ldo_dir_stripe_loaded = 1;
1488         }
1489         EXIT;
1490 unlock:
1491         mutex_unlock(&lo->ldo_layout_mutex);
1492
1493         return rc;
1494 }
1495
1496 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1497                          const struct lu_buf *buf)
1498 {
1499         int rc;
1500
1501         ENTRY;
1502
1503         mutex_lock(&lo->ldo_layout_mutex);
1504         lod_striping_free_nolock(env, lo);
1505         rc = lod_parse_striping(env, lo, buf);
1506         mutex_unlock(&lo->ldo_layout_mutex);
1507
1508         RETURN(rc);
1509 }
1510
1511 /**
1512  * Verify lov_user_md_v1/v3 striping.
1513  *
1514  * Check the validity of all fields including the magic, stripe size,
1515  * stripe count, stripe offset and that the pool is present.  Also check
1516  * that each target index points to an existing target. The additional
1517  * \a is_from_disk turns additional checks. In some cases zero fields
1518  * are allowed (like pattern=0).
1519  *
1520  * \param[in] d                 LOD device
1521  * \param[in] buf               buffer with LOV EA to verify
1522  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1523  *                              1 - from disk, do not allow
1524  *
1525  * \retval                      0 if the striping is valid
1526  * \retval                      -EINVAL if striping is invalid
1527  */
1528 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1529                            bool is_from_disk)
1530 {
1531         struct lov_user_md_v1   *lum;
1532         struct lov_user_md_v3   *lum3;
1533         struct pool_desc        *pool = NULL;
1534         __u32                    magic;
1535         __u32                    stripe_size;
1536         __u16                    stripe_count;
1537         __u16                    stripe_offset;
1538         size_t                   lum_size;
1539         int                      rc = 0;
1540         ENTRY;
1541
1542         lum = buf->lb_buf;
1543
1544         if (buf->lb_len < sizeof(*lum)) {
1545                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1546                        buf->lb_len);
1547                 GOTO(out, rc = -EINVAL);
1548         }
1549
1550         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1551         if (magic != LOV_USER_MAGIC_V1 &&
1552             magic != LOV_USER_MAGIC_V3 &&
1553             magic != LOV_USER_MAGIC_SPECIFIC) {
1554                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1555                        le32_to_cpu(lum->lmm_magic));
1556                 GOTO(out, rc = -EINVAL);
1557         }
1558
1559         /* the user uses "0" for default stripe pattern normally. */
1560         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1561                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1562
1563         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1564                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1565                        le32_to_cpu(lum->lmm_pattern));
1566                 GOTO(out, rc = -EINVAL);
1567         }
1568
1569         /* a released lum comes from creating orphan on hsm release,
1570          * doesn't make sense to verify it. */
1571         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1572                 GOTO(out, rc = 0);
1573
1574         /* 64kB is the largest common page size we see (ia64), and matches the
1575          * check in lfs */
1576         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1577         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1578                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1579                        stripe_size, LOV_MIN_STRIPE_SIZE);
1580                 GOTO(out, rc = -EINVAL);
1581         }
1582
1583         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1584         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1585             lov_pattern(le32_to_cpu(lum->lmm_pattern)) != LOV_PATTERN_MDT) {
1586                 /* if offset is not within valid range [0, osts_size) */
1587                 if (stripe_offset >= d->lod_osts_size) {
1588                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1589                                stripe_offset, d->lod_osts_size);
1590                         GOTO(out, rc = -EINVAL);
1591                 }
1592
1593                 /* if lmm_stripe_offset is *not* in bitmap */
1594                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1595                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1596                                stripe_offset);
1597                         GOTO(out, rc = -EINVAL);
1598                 }
1599         }
1600
1601         if (magic == LOV_USER_MAGIC_V1)
1602                 lum_size = offsetof(struct lov_user_md_v1,
1603                                     lmm_objects[0]);
1604         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1605                 lum_size = offsetof(struct lov_user_md_v3,
1606                                     lmm_objects[0]);
1607         else
1608                 GOTO(out, rc = -EINVAL);
1609
1610         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1611         if (buf->lb_len < lum_size) {
1612                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1613                        "magic %#x and stripe_count %u\n",
1614                        buf->lb_len, lum_size, magic, stripe_count);
1615                 GOTO(out, rc = -EINVAL);
1616         }
1617
1618         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1619                 goto out;
1620
1621         lum3 = buf->lb_buf;
1622         /* In the function below, .hs_keycmp resolves to
1623          * pool_hashkey_keycmp() */
1624         /* coverity[overrun-buffer-val] */
1625         pool = lod_find_pool(d, lum3->lmm_pool_name);
1626         if (pool == NULL)
1627                 goto out;
1628
1629         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1630                 rc = lod_check_index_in_pool(stripe_offset, pool);
1631                 if (rc < 0)
1632                         GOTO(out, rc = -EINVAL);
1633         }
1634
1635         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1636                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1637                        stripe_count, pool_tgt_count(pool));
1638                 GOTO(out, rc = -EINVAL);
1639         }
1640
1641 out:
1642         if (pool != NULL)
1643                 lod_pool_putref(pool);
1644
1645         RETURN(rc);
1646 }
1647
1648 static inline
1649 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1650 {
1651         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1652                  LOV_USER_MAGIC_COMP_V1, "Wrong magic %x\n",
1653                  le32_to_cpu(comp->lcm_magic));
1654         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1655                  "bad index %d, max = %d\n",
1656                  i, le16_to_cpu(comp->lcm_entry_count));
1657
1658         return &comp->lcm_entries[i];
1659 }
1660
1661 #define for_each_comp_entry_v1(comp, entry) \
1662         for (entry = comp_entry_v1(comp, 0); \
1663              entry <= comp_entry_v1(comp, \
1664                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1665              entry++)
1666
1667 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1)
1668 {
1669         struct lov_comp_md_entry_v1 *ent, *dom_ent;
1670         __u16 entries;
1671         __u32 dom_off, dom_size, comp_size;
1672         void *blob_src, *blob_dst;
1673         unsigned int blob_size, blob_shift;
1674
1675         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1676         /* if file has only DoM stripe return just error */
1677         if (entries == 0)
1678                 return -EFBIG;
1679
1680         comp_size = le32_to_cpu(comp_v1->lcm_size);
1681         dom_ent = &comp_v1->lcm_entries[0];
1682         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1683         dom_size = le32_to_cpu(dom_ent->lcme_size);
1684
1685         /* shift entries array first */
1686         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1687         memmove(dom_ent, dom_ent + 1,
1688                 entries * sizeof(struct lov_comp_md_entry_v1));
1689
1690         /* now move blob of layouts */
1691         blob_dst = (void *)comp_v1 + dom_off - sizeof(*dom_ent);
1692         blob_src = (void *)comp_v1 + dom_off + dom_size;
1693         blob_size = (unsigned long)((void *)comp_v1 + comp_size - blob_src);
1694         blob_shift = sizeof(*dom_ent) + dom_size;
1695
1696         memmove(blob_dst, blob_src, blob_size);
1697
1698         for_each_comp_entry_v1(comp_v1, ent) {
1699                 __u32 off;
1700
1701                 off = le32_to_cpu(ent->lcme_offset);
1702                 ent->lcme_offset = cpu_to_le32(off - blob_shift);
1703         }
1704
1705         comp_v1->lcm_size = cpu_to_le32(comp_size - blob_shift);
1706
1707         /* notify a caller to re-check entry */
1708         return -ERESTART;
1709 }
1710
1711 int lod_fix_dom_stripe(struct lod_device *d, struct lov_comp_md_v1 *comp_v1)
1712 {
1713         struct lov_comp_md_entry_v1 *ent, *dom_ent;
1714         struct lu_extent *dom_ext, *ext;
1715         struct lov_user_md_v1 *lum;
1716         __u32 stripe_size;
1717         __u16 mid, dom_mid;
1718         int rc = 0;
1719
1720         dom_ent = &comp_v1->lcm_entries[0];
1721         dom_ext = &dom_ent->lcme_extent;
1722         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
1723         stripe_size = d->lod_dom_max_stripesize;
1724
1725         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
1726         CDEBUG(D_LAYOUT, "DoM component size %u was bigger than MDT limit %u, "
1727                "new size is %u\n", le32_to_cpu(lum->lmm_stripe_size),
1728                d->lod_dom_max_stripesize, stripe_size);
1729         lum->lmm_stripe_size = cpu_to_le32(stripe_size);
1730
1731         for_each_comp_entry_v1(comp_v1, ent) {
1732                 if (ent == dom_ent)
1733                         continue;
1734
1735                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
1736                 if (mid != dom_mid)
1737                         continue;
1738
1739                 ext = &ent->lcme_extent;
1740                 if (ext->e_start != dom_ext->e_end)
1741                         continue;
1742
1743                 /* Found next component after the DoM one with the same
1744                  * mirror_id and adjust its start with DoM component end.
1745                  *
1746                  * NOTE: we are considering here that there can be only one
1747                  * DoM component in a file, all replicas are located on OSTs
1748                  * always and don't need adjustment since use own layouts.
1749                  */
1750                 ext->e_start = cpu_to_le64(stripe_size);
1751                 break;
1752         }
1753
1754         if (stripe_size == 0) {
1755                 /* DoM component size is zero due to server setting,
1756                  * remove it from the layout */
1757                 rc = lod_erase_dom_stripe(comp_v1);
1758         } else {
1759                 /* Update DoM extent end finally */
1760                 dom_ext->e_end = cpu_to_le64(stripe_size);
1761         }
1762
1763         return rc;
1764 }
1765
1766 /**
1767  * Verify LOV striping.
1768  *
1769  * \param[in] d                 LOD device
1770  * \param[in] buf               buffer with LOV EA to verify
1771  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1772  *                              1 - from disk, do not allow
1773  * \param[in] start             extent start for composite layout
1774  *
1775  * \retval                      0 if the striping is valid
1776  * \retval                      -EINVAL if striping is invalid
1777  */
1778 int lod_verify_striping(struct lod_device *d, struct lod_object *lo,
1779                         const struct lu_buf *buf, bool is_from_disk)
1780 {
1781         struct lov_desc *desc = &d->lod_desc;
1782         struct lov_user_md_v1   *lum;
1783         struct lov_comp_md_v1   *comp_v1;
1784         struct lov_comp_md_entry_v1     *ent;
1785         struct lu_extent        *ext;
1786         struct lu_buf   tmp;
1787         __u64   prev_end = 0;
1788         __u32   stripe_size = 0;
1789         __u16   prev_mid = -1, mirror_id = -1;
1790         __u32   mirror_count;
1791         __u32   magic;
1792         int     rc = 0;
1793         ENTRY;
1794
1795         lum = buf->lb_buf;
1796
1797         if (buf->lb_len < sizeof(*lum)) {
1798                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1799                        buf->lb_len);
1800                 RETURN(-EINVAL);
1801         }
1802
1803         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1804         if (magic != LOV_USER_MAGIC_V1 &&
1805             magic != LOV_USER_MAGIC_V3 &&
1806             magic != LOV_USER_MAGIC_SPECIFIC &&
1807             magic != LOV_USER_MAGIC_COMP_V1) {
1808                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1809                        le32_to_cpu(lum->lmm_magic));
1810                 RETURN(-EINVAL);
1811         }
1812
1813         if (magic != LOV_USER_MAGIC_COMP_V1)
1814                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
1815
1816         /* magic == LOV_USER_MAGIC_COMP_V1 */
1817         comp_v1 = buf->lb_buf;
1818         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
1819                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
1820                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
1821                 RETURN(-EINVAL);
1822         }
1823
1824 recheck:
1825         mirror_count = 0;
1826         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
1827                 CDEBUG(D_LAYOUT, "entry count is zero\n");
1828                 RETURN(-EINVAL);
1829         }
1830
1831         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1832             lo->ldo_comp_cnt > 0) {
1833                 /* could be called from lustre.lov.add */
1834                 __u32 cnt = lo->ldo_comp_cnt;
1835
1836                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
1837                 prev_end = ext->e_end;
1838
1839                 ++mirror_count;
1840         }
1841
1842         for_each_comp_entry_v1(comp_v1, ent) {
1843                 ext = &ent->lcme_extent;
1844
1845                 if (le64_to_cpu(ext->e_start) >= le64_to_cpu(ext->e_end)) {
1846                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
1847                                le64_to_cpu(ext->e_start),
1848                                le64_to_cpu(ext->e_end));
1849                         RETURN(-EINVAL);
1850                 }
1851
1852                 if (is_from_disk) {
1853                         /* lcme_id contains valid value */
1854                         if (le32_to_cpu(ent->lcme_id) == 0 ||
1855                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
1856                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
1857                                        le32_to_cpu(ent->lcme_id));
1858                                 RETURN(-EINVAL);
1859                         }
1860
1861                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
1862                                 mirror_id = mirror_id_of(
1863                                                 le32_to_cpu(ent->lcme_id));
1864
1865                                 /* first component must start with 0 */
1866                                 if (mirror_id != prev_mid &&
1867                                     le64_to_cpu(ext->e_start) != 0) {
1868                                         CDEBUG(D_LAYOUT,
1869                                                "invalid start:%llu, expect:0\n",
1870                                                le64_to_cpu(ext->e_start));
1871                                         RETURN(-EINVAL);
1872                                 }
1873
1874                                 prev_mid = mirror_id;
1875                         }
1876                 }
1877
1878                 if (le64_to_cpu(ext->e_start) == 0) {
1879                         ++mirror_count;
1880                         prev_end = 0;
1881                 }
1882
1883                 /* the next must be adjacent with the previous one */
1884                 if (le64_to_cpu(ext->e_start) != prev_end) {
1885                         CDEBUG(D_LAYOUT,
1886                                "invalid start actual:%llu, expect:%llu\n",
1887                                le64_to_cpu(ext->e_start), prev_end);
1888                         RETURN(-EINVAL);
1889                 }
1890
1891                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
1892                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
1893
1894                 /* Check DoM entry is always the first one */
1895                 lum = tmp.lb_buf;
1896                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) ==
1897                     LOV_PATTERN_MDT) {
1898                         /* DoM component can be only the first stripe */
1899                         if (le64_to_cpu(ext->e_start) > 0) {
1900                                 CDEBUG(D_LAYOUT, "invalid DoM component "
1901                                        "with %llu extent start\n",
1902                                        le64_to_cpu(ext->e_start));
1903                                 RETURN(-EINVAL);
1904                         }
1905                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1906                         /* There is just one stripe on MDT and it must
1907                          * cover whole component size. */
1908                         if (stripe_size != le64_to_cpu(ext->e_end)) {
1909                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
1910                                        "stripe size %u != %llu "
1911                                        "(component size)\n",
1912                                        stripe_size, prev_end);
1913                                 RETURN(-EINVAL);
1914                         }
1915                         /* Check stripe size againts per-MDT limit */
1916                         if (stripe_size > d->lod_dom_max_stripesize) {
1917                                 CDEBUG(D_LAYOUT, "DoM component size "
1918                                        "%u is bigger than MDT limit %u, check "
1919                                        "dom_max_stripesize parameter\n",
1920                                        stripe_size, d->lod_dom_max_stripesize);
1921                                 rc = lod_fix_dom_stripe(d, comp_v1);
1922                                 if (rc == -ERESTART) {
1923                                         /* DoM entry was removed, re-check
1924                                          * new layout from start */
1925                                         goto recheck;
1926                                 } else if (rc) {
1927                                         RETURN(rc);
1928                                 }
1929                         }
1930                 }
1931
1932                 prev_end = le64_to_cpu(ext->e_end);
1933
1934                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
1935                 if (rc)
1936                         RETURN(rc);
1937
1938                 if (prev_end == LUSTRE_EOF)
1939                         continue;
1940
1941                 /* extent end must be aligned with the stripe_size */
1942                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1943                 if (stripe_size == 0)
1944                         stripe_size = desc->ld_default_stripe_size;
1945                 if (stripe_size == 0 || (prev_end & (stripe_size - 1))) {
1946                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
1947                                "stripe_sz: %u, [%llu, %llu)\n",
1948                                stripe_size, ext->e_start, prev_end);
1949                         RETURN(-EINVAL);
1950                 }
1951         }
1952
1953         /* make sure that the mirror_count is telling the truth */
1954         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
1955                 RETURN(-EINVAL);
1956
1957         RETURN(0);
1958 }
1959
1960 /**
1961  * set the default stripe size, if unset.
1962  *
1963  * \param[in,out] val   number of bytes per OST stripe
1964  *
1965  * The minimum stripe size is 64KB to ensure that a single stripe is an
1966  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
1967  * is difficult to split dirty pages across OSCs during writes.
1968  */
1969 void lod_fix_desc_stripe_size(__u64 *val)
1970 {
1971         if (*val < LOV_MIN_STRIPE_SIZE) {
1972                 if (*val != 0)
1973                         LCONSOLE_INFO("Increasing default stripe size to "
1974                                       "minimum value %u\n",
1975                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1976                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1977         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1978                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1979                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
1980                               "multiple of %u)\n",
1981                               *val, LOV_MIN_STRIPE_SIZE);
1982         }
1983 }
1984
1985 /**
1986  * set the filesystem default number of stripes, if unset.
1987  *
1988  * \param[in,out] val   number of stripes
1989  *
1990  * A value of "0" means "use the system-wide default stripe count", which
1991  * has either been inherited by now, or falls back to 1 stripe per file.
1992  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
1993  * and is a valid value, so is left unchanged here.
1994  */
1995 void lod_fix_desc_stripe_count(__u32 *val)
1996 {
1997         if (*val == 0)
1998                 *val = 1;
1999 }
2000
2001 /**
2002  * set the filesystem default layout pattern
2003  *
2004  * \param[in,out] val   LOV_PATTERN_* layout
2005  *
2006  * A value of "0" means "use the system-wide default layout type", which
2007  * has either been inherited by now, or falls back to plain RAID0 striping.
2008  */
2009 void lod_fix_desc_pattern(__u32 *val)
2010 {
2011         /* from lov_setstripe */
2012         if ((*val != 0) && (*val != LOV_PATTERN_RAID0) &&
2013             (*val != LOV_PATTERN_MDT)) {
2014                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
2015                 *val = 0;
2016         }
2017 }
2018
2019 void lod_fix_desc_qos_maxage(__u32 *val)
2020 {
2021         /* fix qos_maxage */
2022         if (*val == 0)
2023                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2024 }
2025
2026 /**
2027  * Used to fix insane default striping.
2028  *
2029  * \param[in] desc      striping description
2030  */
2031 void lod_fix_desc(struct lov_desc *desc)
2032 {
2033         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2034         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2035         lod_fix_desc_pattern(&desc->ld_pattern);
2036         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2037 }
2038
2039 /**
2040  * Initialize the structures used to store pools and default striping.
2041  *
2042  * \param[in] lod       LOD device
2043  * \param[in] lcfg      configuration structure storing default striping.
2044  *
2045  * \retval              0 if initialization succeeds
2046  * \retval              negative error number on failure
2047  */
2048 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2049 {
2050         struct obd_device          *obd;
2051         struct lov_desc            *desc;
2052         int                         rc;
2053         ENTRY;
2054
2055         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2056         LASSERT(obd != NULL);
2057         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2058
2059         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2060                 CERROR("LOD setup requires a descriptor\n");
2061                 RETURN(-EINVAL);
2062         }
2063
2064         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2065
2066         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2067                 CERROR("descriptor size wrong: %d > %d\n",
2068                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2069                 RETURN(-EINVAL);
2070         }
2071
2072         if (desc->ld_magic != LOV_DESC_MAGIC) {
2073                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2074                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2075                                obd->obd_name, desc);
2076                         lustre_swab_lov_desc(desc);
2077                 } else {
2078                         CERROR("%s: Bad lov desc magic: %#x\n",
2079                                obd->obd_name, desc->ld_magic);
2080                         RETURN(-EINVAL);
2081                 }
2082         }
2083
2084         lod_fix_desc(desc);
2085
2086         desc->ld_active_tgt_count = 0;
2087         lod->lod_desc = *desc;
2088
2089         lod->lod_sp_me = LUSTRE_SP_CLI;
2090
2091         /* Set up allocation policy (QoS and RR) */
2092         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
2093         init_rwsem(&lod->lod_qos.lq_rw_sem);
2094         lod->lod_qos.lq_dirty = 1;
2095         lod->lod_qos.lq_rr.lqr_dirty = 1;
2096         lod->lod_qos.lq_reset = 1;
2097         /* Default priority is toward free space balance */
2098         lod->lod_qos.lq_prio_free = 232;
2099         /* Default threshold for rr (roughly 17%) */
2100         lod->lod_qos.lq_threshold_rr = 43;
2101
2102         /* Set up OST pool environment */
2103         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
2104                                                    HASH_POOLS_MAX_BITS,
2105                                                    HASH_POOLS_BKT_BITS, 0,
2106                                                    CFS_HASH_MIN_THETA,
2107                                                    CFS_HASH_MAX_THETA,
2108                                                    &pool_hash_operations,
2109                                                    CFS_HASH_DEFAULT);
2110         if (lod->lod_pools_hash_body == NULL)
2111                 RETURN(-ENOMEM);
2112
2113         INIT_LIST_HEAD(&lod->lod_pool_list);
2114         lod->lod_pool_count = 0;
2115         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
2116         if (rc)
2117                 GOTO(out_hash, rc);
2118         lod_qos_rr_init(&lod->lod_qos.lq_rr);
2119         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
2120         if (rc)
2121                 GOTO(out_pool_info, rc);
2122
2123         RETURN(0);
2124
2125 out_pool_info:
2126         lod_ost_pool_free(&lod->lod_pool_info);
2127 out_hash:
2128         cfs_hash_putref(lod->lod_pools_hash_body);
2129
2130         return rc;
2131 }
2132
2133 /**
2134  * Release the structures describing the pools.
2135  *
2136  * \param[in] lod       LOD device from which we release the structures
2137  *
2138  * \retval              0 always
2139  */
2140 int lod_pools_fini(struct lod_device *lod)
2141 {
2142         struct obd_device   *obd = lod2obd(lod);
2143         struct pool_desc    *pool, *tmp;
2144         ENTRY;
2145
2146         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2147                 /* free pool structs */
2148                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2149                 /* In the function below, .hs_keycmp resolves to
2150                  * pool_hashkey_keycmp() */
2151                 /* coverity[overrun-buffer-val] */
2152                 lod_pool_del(obd, pool->pool_name);
2153         }
2154
2155         cfs_hash_putref(lod->lod_pools_hash_body);
2156         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
2157         lod_ost_pool_free(&lod->lod_pool_info);
2158
2159         RETURN(0);
2160 }