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LU-1303 lod: introcude QoS structures
[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  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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 /*
27  * lustre/lod/lod_lov.c
28  *
29  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com> 
30  */
31
32 #ifndef EXPORT_SYMTAB
33 # define EXPORT_SYMTAB
34 #endif
35 #define DEBUG_SUBSYSTEM S_MDS
36
37 #include <obd_class.h>
38 #include <obd_lov.h>
39
40 #include "lod_internal.h"
41
42 /*
43  * Keep a refcount of lod->lod_osts usage to prevent racing with
44  * addition/deletion. Any function that expects lov_tgts to remain stationary
45  * must take a ref.
46  *
47  * \param lod - is the lod device from which we want to grab a reference
48  */
49 void lod_getref(struct lod_device *lod)
50 {
51         cfs_down_read(&lod->lod_rw_sem);
52         cfs_mutex_lock(&lod->lod_mutex);
53         lod->lod_refcount++;
54         cfs_mutex_unlock(&lod->lod_mutex);
55 }
56
57 /*
58  * Companion of lod_getref() to release a reference on the lod table.
59  * If this is the last reference and the ost entry was scheduled for deletion,
60  * the descriptor is removed from the array.
61  *
62  * \param lod - is the lod device from which we release a reference
63  */
64 void lod_putref(struct lod_device *lod)
65 {
66         cfs_mutex_lock(&lod->lod_mutex);
67         lod->lod_refcount--;
68         if (lod->lod_refcount == 0 && lod->lod_death_row) {
69                 struct lod_ost_desc *ost_desc, *tmp;
70                 int                  idx;
71                 CFS_LIST_HEAD(kill);
72
73                 CDEBUG(D_CONFIG, "destroying %d lod desc\n",
74                        lod->lod_death_row);
75
76                 cfs_foreach_bit(lod->lod_ost_bitmap, idx) {
77                         ost_desc = OST_TGT(lod, idx);
78                         LASSERT(ost_desc);
79
80                         if (!ost_desc->ltd_reap)
81                                 continue;
82
83                         cfs_list_add(&ost_desc->ltd_kill, &kill);
84
85                         lod_ost_pool_remove(&lod->lod_pool_info, idx);
86                         OST_TGT(lod, idx) = NULL;
87                         lod->lod_ostnr--;
88                         cfs_bitmap_clear(lod->lod_ost_bitmap, idx);
89                         if (ost_desc->ltd_active)
90                                 lod->lod_desc.ld_active_tgt_count--;
91                         lod->lod_death_row--;
92                 }
93                 cfs_mutex_unlock(&lod->lod_mutex);
94                 cfs_up_read(&lod->lod_rw_sem);
95
96                 cfs_list_for_each_entry_safe(ost_desc, tmp, &kill, ltd_kill) {
97                         int rc;
98                         cfs_list_del(&ost_desc->ltd_kill);
99                         /* remove from QoS structures */
100                         rc = qos_del_tgt(lod, ost_desc);
101                         if (rc)
102                                 CERROR("%s: qos_del_tgt(%s) failed: rc = %d\n",
103                                        lod2obd(lod)->obd_name,
104                                        obd_uuid2str(&ost_desc->ltd_uuid), rc);
105                         rc = obd_disconnect(ost_desc->ltd_exp);
106                         if (rc)
107                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
108                                        lod2obd(lod)->obd_name,
109                                        obd_uuid2str(&ost_desc->ltd_uuid), rc);
110                         OBD_FREE_PTR(ost_desc);
111                 }
112         } else {
113                 cfs_mutex_unlock(&lod->lod_mutex);
114                 cfs_up_read(&lod->lod_rw_sem);
115         }
116 }
117
118 static int lod_bitmap_resize(struct lod_device *lod, __u32 newsize)
119 {
120         cfs_bitmap_t *new_bitmap, *old_bitmap = NULL;
121         int           rc = 0;
122         ENTRY;
123
124         /* grab write reference on the lod. Relocating the array requires
125          * exclusive access */
126         cfs_down_write(&lod->lod_rw_sem);
127
128         if (newsize <= lod->lod_osts_size)
129                 /* someone else has already resize the array */
130                 GOTO(out, rc = 0);
131
132         /* allocate new bitmap */
133         new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
134         if (!new_bitmap)
135                 GOTO(out, rc = -ENOMEM);
136
137         if (lod->lod_osts_size > 0) {
138                 /* the bitmap already exists, we need
139                  * to copy data from old one */
140                 cfs_bitmap_copy(new_bitmap, lod->lod_ost_bitmap);
141                 old_bitmap = lod->lod_ost_bitmap;
142         }
143
144         lod->lod_osts_size  = newsize;
145         lod->lod_ost_bitmap = new_bitmap;
146
147         if (old_bitmap)
148                 CFS_FREE_BITMAP(old_bitmap);
149
150         CDEBUG(D_CONFIG, "ost size: %d\n", lod->lod_osts_size);
151
152         EXIT;
153 out:
154         cfs_up_write(&lod->lod_rw_sem);
155         return rc;
156 }
157
158 /*
159  * Connect LOD to a new OSP and add it to the device table.
160  *
161  * \param env - is the environment passed by the caller
162  * \param lod - is the LOD device to be connected to the new OSP
163  * \param osp - is the name of OSP device name about to be added
164  * \param index - is the OSP index
165  * \param gen - is the generation number
166  */
167 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
168                    char *osp, unsigned index, unsigned gen, int active)
169 {
170         struct obd_connect_data *data = NULL;
171         struct obd_export       *exp = NULL;
172         struct obd_device       *obd;
173         struct lu_device        *ldev;
174         struct dt_device        *d;
175         int                      rc;
176         struct lod_ost_desc     *ost_desc;
177         struct obd_uuid          obd_uuid;
178
179         ENTRY;
180
181         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
182
183         if (gen <= 0) {
184                 CERROR("request to add OBD %s with invalid generation: %d\n",
185                        osp, gen);
186                 RETURN(-EINVAL);
187         }
188
189         obd_str2uuid(&obd_uuid, osp);
190
191         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
192                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
193         if (obd == NULL) {
194                 CERROR("can't find %s device\n", osp);
195                 RETURN(-EINVAL);
196         }
197
198         OBD_ALLOC_PTR(data);
199         if (data == NULL)
200                 RETURN(-ENOMEM);
201
202         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
203         data->ocd_version = LUSTRE_VERSION_CODE;
204         data->ocd_index = index;
205
206         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
207         OBD_FREE_PTR(data);
208         if (rc) {
209                 CERROR("%s: cannot connect to next dev %s (%d)\n",
210                        obd->obd_name, osp, rc);
211                 GOTO(out_free, rc);
212         }
213
214         LASSERT(obd->obd_lu_dev);
215         LASSERT(obd->obd_lu_dev->ld_site = lod->lod_dt_dev.dd_lu_dev.ld_site);
216
217         ldev = obd->obd_lu_dev;
218         d = lu2dt_dev(ldev);
219
220         /* Allocate ost descriptor and fill it */
221         OBD_ALLOC_PTR(ost_desc);
222         if (!ost_desc)
223                 GOTO(out_conn, rc = -ENOMEM);
224
225         ost_desc->ltd_ost    = d;
226         ost_desc->ltd_exp    = exp;
227         ost_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
228         ost_desc->ltd_gen    = gen;
229         ost_desc->ltd_index  = index;
230         ost_desc->ltd_active = active;
231
232         lod_getref(lod);
233         if (index >= lod->lod_osts_size) {
234                 /* we have to increase the size of the lod_osts array */
235                 __u32  newsize;
236
237                 newsize = max(lod->lod_osts_size, (__u32)2);
238                 while (newsize < index + 1)
239                         newsize = newsize << 1;
240
241                 /* lod_bitmap_resize() needs lod_rw_sem
242                  * which we hold with th reference */
243                 lod_putref(lod);
244
245                 rc = lod_bitmap_resize(lod, newsize);
246                 if (rc)
247                         GOTO(out_desc, rc);
248
249                 lod_getref(lod);
250         }
251
252         cfs_mutex_lock(&lod->lod_mutex);
253         if (cfs_bitmap_check(lod->lod_ost_bitmap, index)) {
254                 CERROR("%s: device %d is registered already\n", obd->obd_name,
255                        index);
256                 GOTO(out_mutex, rc = -EEXIST);
257         }
258
259         if (lod->lod_ost_idx[index / OST_PTRS_PER_BLOCK] == NULL) {
260                 OBD_ALLOC_PTR(lod->lod_ost_idx[index / OST_PTRS_PER_BLOCK]);
261                 if (lod->lod_ost_idx[index / OST_PTRS_PER_BLOCK] == NULL) {
262                         CERROR("can't allocate index to add %s\n",
263                                obd->obd_name);
264                         GOTO(out_mutex, rc = -ENOMEM);
265                 }
266         }
267
268         rc = lod_ost_pool_add(&lod->lod_pool_info, index, lod->lod_osts_size);
269         if (rc) {
270                 CERROR("%s: can't set up pool, failed with %d\n",
271                        obd->obd_name, rc);
272                 GOTO(out_mutex, rc);
273         }
274
275         rc = qos_add_tgt(lod, ost_desc);
276         if (rc) {
277                 CERROR("%s: qos_add_tgt(%s) failed: rc = %d\n", obd->obd_name,
278                        obd_uuid2str(&ost_desc->ltd_uuid), rc);
279                 GOTO(out_pool, rc);
280         }
281
282         /* The new OST is now a full citizen */
283         if (index >= lod->lod_desc.ld_tgt_count)
284                 lod->lod_desc.ld_tgt_count = index + 1;
285         if (active)
286                 lod->lod_desc.ld_active_tgt_count++;
287         OST_TGT(lod, index) = ost_desc;
288         cfs_bitmap_set(lod->lod_ost_bitmap, index);
289         lod->lod_ostnr++;
290         cfs_mutex_unlock(&lod->lod_mutex);
291         lod_putref(lod);
292
293         if (lod->lod_recovery_completed)
294                 ldev->ld_ops->ldo_recovery_complete(env, ldev);
295
296         RETURN(0);
297
298 out_pool:
299         lod_ost_pool_remove(&lod->lod_pool_info, index);
300 out_mutex:
301         cfs_mutex_unlock(&lod->lod_mutex);
302         lod_putref(lod);
303 out_desc:
304         OBD_FREE_PTR(ost_desc);
305 out_conn:
306         obd_disconnect(exp);
307 out_free:
308         return rc;
309 }
310
311 /*
312  * helper function to schedule OST removal from the device table
313  */
314 static void __lod_del_device(struct lod_device *lod, unsigned idx)
315 {
316         LASSERT(OST_TGT(lod,idx));
317         if (OST_TGT(lod,idx)->ltd_reap == 0) {
318                 OST_TGT(lod,idx)->ltd_reap = 1;
319                 lod->lod_death_row++;
320         }
321 }
322
323 /*
324  * Add support for administratively disabled OST (through the MGS).
325  * Schedule a target for deletion.  Disconnection and real removal from the
326  * table takes place in lod_putref() once the last table user release its
327  * reference.
328  *
329  * \param env - is the environment passed by the caller
330  * \param lod - is the lod device currently connected to the OSP about to be
331  *              removed
332  * \param osp - is the name of OSP device about to be removed
333  * \param idx - is the OSP index
334  * \param gen - is the generation number, not used currently
335  */
336 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
337                    char *osp, unsigned idx, unsigned gen)
338 {
339         struct obd_device *obd;
340         int                rc = 0;
341         struct obd_uuid    uuid;
342         ENTRY;
343
344         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
345
346         obd = class_name2obd(osp);
347         if (obd == NULL) {
348                 CERROR("can't find %s device\n", osp);
349                 RETURN(-EINVAL);
350         }
351
352         if (gen <= 0) {
353                 CERROR("%s: request to remove OBD %s with invalid generation %d"
354                        "\n", obd->obd_name, osp, gen);
355                 RETURN(-EINVAL);
356         }
357
358         obd_str2uuid(&uuid,  osp);
359
360         lod_getref(lod);
361         cfs_mutex_lock(&lod->lod_mutex);
362         /* check that the index is allocated in the bitmap */
363         if (!cfs_bitmap_check(lod->lod_ost_bitmap, idx) || !OST_TGT(lod,idx)) {
364                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
365                 GOTO(out, rc = -EINVAL);
366         }
367
368         /* check that the UUID matches */
369         if (!obd_uuid_equals(&uuid, &OST_TGT(lod,idx)->ltd_uuid)) {
370                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
371                        obd->obd_name, obd_uuid2str(&OST_TGT(lod,idx)->ltd_uuid),
372                        idx, osp);
373                 GOTO(out, rc = -EINVAL);
374         }
375
376         __lod_del_device(lod, idx);
377         EXIT;
378 out:
379         cfs_mutex_unlock(&lod->lod_mutex);
380         lod_putref(lod);
381         return(rc);
382 }
383
384 int lod_ea_store_resize(struct lod_thread_info *info, int size)
385 {
386         int round = size_roundup_power2(size);
387
388         LASSERT(round <= lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
389         if (info->lti_ea_store) {
390                 LASSERT(info->lti_ea_store_size);
391                 LASSERT(info->lti_ea_store_size < round);
392                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
393                        info->lti_ea_store_size, round);
394                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
395                 info->lti_ea_store = NULL;
396                 info->lti_ea_store_size = 0;
397         }
398
399         OBD_ALLOC_LARGE(info->lti_ea_store, round);
400         if (info->lti_ea_store == NULL)
401                 RETURN(-ENOMEM);
402         info->lti_ea_store_size = round;
403         RETURN(0);
404 }
405
406 int lod_get_lov_ea(const struct lu_env *env, struct lod_object *lo)
407 {
408         struct lod_thread_info *info = lod_env_info(env);
409         struct dt_object       *next = dt_object_child(&lo->ldo_obj);
410         int                     rc;
411         ENTRY;
412
413         LASSERT(info);
414
415         if (unlikely(info->lti_ea_store_size == 0)) {
416                 /* just to enter in allocation block below */
417                 rc = -ERANGE;
418         } else {
419 repeat:
420                 info->lti_buf.lb_buf = info->lti_ea_store;
421                 info->lti_buf.lb_len = info->lti_ea_store_size;
422                 rc = dt_xattr_get(env, next, &info->lti_buf, XATTR_NAME_LOV,
423                                   BYPASS_CAPA);
424         }
425         /* if object is not striped or inaccessible */
426         if (rc == -ENODATA)
427                 RETURN(0);
428
429         if (rc == -ERANGE) {
430                 /* EA doesn't fit, reallocate new buffer */
431                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, XATTR_NAME_LOV,
432                                   BYPASS_CAPA);
433                 if (rc == -ENODATA)
434                         RETURN(0);
435                 else if (rc < 0)
436                         RETURN(rc);
437
438                 LASSERT(rc > 0);
439                 rc = lod_ea_store_resize(info, rc);
440                 if (rc)
441                         RETURN(rc);
442                 goto repeat;
443         }
444
445         RETURN(rc);
446 }
447
448 /*
449  * allocate array of objects pointers, find/create objects
450  * stripenr and other fields should be initialized by this moment
451  */
452 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
453                            struct lov_ost_data_v1 *objs)
454 {
455         struct lod_thread_info  *info = lod_env_info(env);
456         struct lod_device       *md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
457         struct lu_object        *o, *n;
458         struct lu_device        *nd;
459         int                     i, idx, rc = 0;
460         ENTRY;
461
462         LASSERT(lo);
463         LASSERT(lo->ldo_stripe == NULL);
464         LASSERT(lo->ldo_stripenr > 0);
465         LASSERT(lo->ldo_stripe_size > 0);
466
467         i = sizeof(struct dt_object *) * lo->ldo_stripenr;
468         OBD_ALLOC(lo->ldo_stripe, i);
469         if (lo->ldo_stripe == NULL)
470                 GOTO(out, rc = -ENOMEM);
471         lo->ldo_stripes_allocated = lo->ldo_stripenr;
472
473         for (i = 0; i < lo->ldo_stripenr; i++) {
474
475                 info->lti_ostid.oi_id = le64_to_cpu(objs[i].l_object_id);
476                 /* XXX: support for DNE? */
477                 info->lti_ostid.oi_seq = le64_to_cpu(objs[i].l_object_seq);
478                 idx = le64_to_cpu(objs[i].l_ost_idx);
479                 fid_ostid_unpack(&info->lti_fid, &info->lti_ostid, idx);
480
481                 /*
482                  * XXX: assertion is left for testing, to make
483                  * sure we never process requests till configuration
484                  * is completed. to be changed to -EINVAL
485                  */
486
487                 lod_getref(md);
488                 LASSERT(cfs_bitmap_check(md->lod_ost_bitmap, idx));
489                 LASSERT(OST_TGT(md,idx));
490                 LASSERTF(OST_TGT(md,idx)->ltd_ost, "idx %d\n", idx);
491                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
492                 lod_putref(md);
493
494                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
495                 if (IS_ERR(o))
496                         GOTO(out, rc = PTR_ERR(o));
497
498                 n = lu_object_locate(o->lo_header, nd->ld_type);
499                 LASSERT(n);
500
501                 lo->ldo_stripe[i] = container_of(n, struct dt_object, do_lu);
502         }
503
504 out:
505         RETURN(rc);
506 }
507
508 /*
509  * Parse striping information stored in lti_ea_store
510  */
511 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
512                        const struct lu_buf *buf)
513 {
514         struct lov_mds_md_v1    *lmm;
515         struct lov_ost_data_v1  *objs;
516         __u32                    magic;
517         int                      rc = 0;
518         ENTRY;
519
520         LASSERT(buf);
521         LASSERT(buf->lb_buf);
522         LASSERT(buf->lb_len);
523
524         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
525         magic = le32_to_cpu(lmm->lmm_magic);
526
527         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
528                 GOTO(out, rc = -EINVAL);
529         if (le32_to_cpu(lmm->lmm_pattern) != LOV_PATTERN_RAID0)
530                 GOTO(out, rc = -EINVAL);
531
532         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
533         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
534         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
535
536         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
537
538         if (magic == LOV_MAGIC_V3) {
539                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
540                 objs = &v3->lmm_objects[0];
541                 lod_object_set_pool(lo, v3->lmm_pool_name);
542         } else {
543                 objs = &lmm->lmm_objects[0];
544         }
545
546         rc = lod_initialize_objects(env, lo, objs);
547
548 out:
549         RETURN(rc);
550 }
551
552 /*
553  * Load and parse striping information, create in-core representation for the
554  * stripes
555  */
556 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
557 {
558         struct lod_thread_info  *info = lod_env_info(env);
559         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
560         int                      rc;
561         ENTRY;
562
563         /*
564          * currently this code is supposed to be called from declaration
565          * phase only, thus the object is not expected to be locked by caller
566          */
567         dt_write_lock(env, next, 0);
568         /* already initialized? */
569         if (lo->ldo_stripe) {
570                 int i;
571                 /* check validity */
572                 for (i = 0; i < lo->ldo_stripenr; i++)
573                         LASSERTF(lo->ldo_stripe[i], "stripe %d is NULL\n", i);
574                 GOTO(out, rc = 0);
575         }
576
577         if (!dt_object_exists(next))
578                 GOTO(out, rc = 0);
579
580         /* only regular files can be striped */
581         if (!(lu_object_attr(lod2lu_obj(lo)) & S_IFREG))
582                 GOTO(out, rc = 0);
583
584         LASSERT(lo->ldo_stripenr == 0);
585
586         rc = lod_get_lov_ea(env, lo);
587         if (rc <= 0)
588                 GOTO(out, rc);
589
590         /*
591          * there is LOV EA (striping information) in this object
592          * let's parse it and create in-core objects for the stripes
593          */
594         info->lti_buf.lb_buf = info->lti_ea_store;
595         info->lti_buf.lb_len = info->lti_ea_store_size;
596         rc = lod_parse_striping(env, lo, &info->lti_buf);
597 out:
598         dt_write_unlock(env, next);
599         RETURN(rc);
600 }
601
602 void lod_fix_desc_stripe_size(__u64 *val)
603 {
604         if (*val < PTLRPC_MAX_BRW_SIZE) {
605                 LCONSOLE_WARN("Increasing default stripe size to min %u\n",
606                               PTLRPC_MAX_BRW_SIZE);
607                 *val = PTLRPC_MAX_BRW_SIZE;
608         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
609                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
610                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
611                               "multiple of %u)\n",
612                               *val, LOV_MIN_STRIPE_SIZE);
613         }
614 }
615
616 void lod_fix_desc_stripe_count(__u32 *val)
617 {
618         if (*val == 0)
619                 *val = 1;
620 }
621
622 void lod_fix_desc_pattern(__u32 *val)
623 {
624         /* from lov_setstripe */
625         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
626                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
627                 *val = 0;
628         }
629 }
630
631 void lod_fix_desc_qos_maxage(__u32 *val)
632 {
633         /* fix qos_maxage */
634         if (*val == 0)
635                 *val = QOS_DEFAULT_MAXAGE;
636 }
637
638 void lod_fix_desc(struct lov_desc *desc)
639 {
640         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
641         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
642         lod_fix_desc_pattern(&desc->ld_pattern);
643         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
644 }
645
646 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
647 {
648         struct lprocfs_static_vars  lvars = { 0 };
649         struct obd_device          *obd;
650         struct lov_desc            *desc;
651         int                         rc;
652         ENTRY;
653
654         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
655         LASSERT(obd != NULL);
656         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
657
658         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
659                 CERROR("LOD setup requires a descriptor\n");
660                 RETURN(-EINVAL);
661         }
662
663         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
664
665         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
666                 CERROR("descriptor size wrong: %d > %d\n",
667                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
668                 RETURN(-EINVAL);
669         }
670
671         if (desc->ld_magic != LOV_DESC_MAGIC) {
672                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
673                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
674                                obd->obd_name, desc);
675                         lustre_swab_lov_desc(desc);
676                 } else {
677                         CERROR("%s: Bad lov desc magic: %#x\n",
678                                obd->obd_name, desc->ld_magic);
679                         RETURN(-EINVAL);
680                 }
681         }
682
683         lod_fix_desc(desc);
684
685         desc->ld_active_tgt_count = 0;
686         lod->lod_desc = *desc;
687
688         lod->lod_sp_me = LUSTRE_SP_CLI;
689
690         /* Set up allocation policy (QoS and RR) */
691         CFS_INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
692         cfs_init_rwsem(&lod->lod_qos.lq_rw_sem);
693         lod->lod_qos.lq_dirty = 1;
694         lod->lod_qos.lq_rr.lqr_dirty = 1;
695         lod->lod_qos.lq_reset = 1;
696         /* Default priority is toward free space balance */
697         lod->lod_qos.lq_prio_free = 232;
698         /* Default threshold for rr (roughly 17%) */
699         lod->lod_qos.lq_threshold_rr = 43;
700         /* Init statfs fields */
701         OBD_ALLOC_PTR(lod->lod_qos.lq_statfs_data);
702         if (NULL == lod->lod_qos.lq_statfs_data)
703                 RETURN(-ENOMEM);
704         cfs_waitq_init(&lod->lod_qos.lq_statfs_waitq);
705
706         /* Set up OST pool environment */
707         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
708                                                    HASH_POOLS_MAX_BITS,
709                                                    HASH_POOLS_BKT_BITS, 0,
710                                                    CFS_HASH_MIN_THETA,
711                                                    CFS_HASH_MAX_THETA,
712                                                    &pool_hash_operations,
713                                                    CFS_HASH_DEFAULT);
714         if (!lod->lod_pools_hash_body)
715                 GOTO(out_statfs, rc = -ENOMEM);
716         CFS_INIT_LIST_HEAD(&lod->lod_pool_list);
717         lod->lod_pool_count = 0;
718         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
719         if (rc)
720                 GOTO(out_hash, rc);
721         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
722         if (rc)
723                 GOTO(out_pool_info, rc);
724
725         /* the OST array and bitmap are allocated/grown dynamically as OSTs are
726          * added to the LOD, see lod_add_device() */
727         lod->lod_ost_bitmap = NULL;
728         lod->lod_osts_size  = 0;
729         lod->lod_ostnr      = 0;
730
731         lod->lod_death_row = 0;
732         lod->lod_refcount  = 0;
733
734         lprocfs_lod_init_vars(&lvars);
735         lprocfs_obd_setup(obd, lvars.obd_vars);
736
737 #ifdef LPROCFS
738         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
739                                 0444, &lod_proc_target_fops, obd);
740         if (rc) {
741                 CWARN("%s: Error adding the target_obd file %d\n",
742                       obd->obd_name, rc);
743                 GOTO(out_lproc, rc);
744         }
745         lod->lod_pool_proc_entry = lprocfs_register("pools",
746                                                     obd->obd_proc_entry,
747                                                     NULL, NULL);
748         if (IS_ERR(lod->lod_pool_proc_entry)) {
749                 int ret = PTR_ERR(lod->lod_pool_proc_entry);
750                 lod->lod_pool_proc_entry = NULL;
751                 CWARN("%s: Failed to create pool proc file %d\n",
752                       obd->obd_name, ret);
753                 rc = lod_pools_fini(lod);
754                 RETURN(ret);
755         }
756 #endif
757
758         RETURN(0);
759
760 out_lproc:
761         lprocfs_obd_cleanup(obd);
762         lod_ost_pool_free(&lod->lod_qos.lq_rr.lqr_pool);
763 out_pool_info:
764         lod_ost_pool_free(&lod->lod_pool_info);
765 out_hash:
766         cfs_hash_putref(lod->lod_pools_hash_body);
767 out_statfs:
768         OBD_FREE_PTR(lod->lod_qos.lq_statfs_data);
769         return rc;
770 }
771
772 int lod_pools_fini(struct lod_device *lod)
773 {
774         struct obd_device   *obd = lod2obd(lod);
775         cfs_list_t          *pos, *tmp;
776         struct pool_desc    *pool;
777         ENTRY;
778
779         cfs_list_for_each_safe(pos, tmp, &lod->lod_pool_list) {
780                 pool = cfs_list_entry(pos, struct pool_desc, pool_list);
781                 /* free pool structs */
782                 CDEBUG(D_INFO, "delete pool %p\n", pool);
783                 lod_pool_del(obd, pool->pool_name);
784         }
785
786         if (lod->lod_osts_size > 0) {
787                 int idx;
788                 lod_getref(lod);
789                 cfs_mutex_lock(&lod->lod_mutex);
790                 cfs_foreach_bit(lod->lod_ost_bitmap, idx)
791                         __lod_del_device(lod, idx);
792                 cfs_mutex_unlock(&lod->lod_mutex);
793                 lod_putref(lod);
794                 CFS_FREE_BITMAP(lod->lod_ost_bitmap);
795                 for (idx = 0; idx < OST_PTRS; idx++) {
796                         if (lod->lod_ost_idx[idx])
797                                 OBD_FREE_PTR(lod->lod_ost_idx[idx]);
798                 }
799                 lod->lod_osts_size = 0;
800         }
801
802         cfs_hash_putref(lod->lod_pools_hash_body);
803         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
804         lod_ost_pool_free(&lod->lod_pool_info);
805
806         /* clear pools parent proc entry only after all pools are killed */
807         if (lod->lod_pool_proc_entry) {
808                 lprocfs_remove(&lod->lod_pool_proc_entry);
809                 lod->lod_pool_proc_entry = NULL;
810         }
811
812         lprocfs_obd_cleanup(obd);
813
814         OBD_FREE_PTR(lod->lod_qos.lq_statfs_data);
815         RETURN(0);
816 }
817