4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see [sun.com URL with a
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/lov/lov_pool.c
40 * Author: Jacques-Charles LAFOUCRIERE <jc.lafoucriere@cea.fr>
41 * Author: Alex Lyashkov <Alexey.Lyashkov@Sun.COM>
42 * Author: Nathaniel Rutman <Nathan.Rutman@Sun.COM>
45 #define DEBUG_SUBSYSTEM S_LOV
47 #include <libcfs/libcfs.h>
50 #include "lov_internal.h"
52 #define pool_tgt(_p, _i) \
53 _p->pool_lobd->u.lov.lov_tgts[_p->pool_obds.op_array[_i]]
55 static void lov_pool_getref(struct pool_desc *pool)
57 CDEBUG(D_INFO, "pool %p\n", pool);
58 atomic_inc(&pool->pool_refcount);
61 static void lov_pool_putref(struct pool_desc *pool)
63 CDEBUG(D_INFO, "pool %p\n", pool);
64 if (atomic_dec_and_test(&pool->pool_refcount)) {
65 LASSERT(hlist_unhashed(&pool->pool_hash));
66 LASSERT(list_empty(&pool->pool_list));
67 LASSERT(pool->pool_proc_entry == NULL);
68 lov_ost_pool_free(&(pool->pool_obds));
74 static void lov_pool_putref_locked(struct pool_desc *pool)
76 CDEBUG(D_INFO, "pool %p\n", pool);
77 LASSERT(atomic_read(&pool->pool_refcount) > 1);
79 atomic_dec(&pool->pool_refcount);
83 * hash function using a Rotating Hash algorithm
84 * Knuth, D. The Art of Computer Programming,
85 * Volume 3: Sorting and Searching,
87 * Addison Wesley, 1973
89 static __u32 pool_hashfn(cfs_hash_t *hash_body, const void *key, unsigned mask)
96 poolname = (char *)key;
97 for (i = 0; i < LOV_MAXPOOLNAME; i++) {
98 if (poolname[i] == '\0')
100 result = (result << 4)^(result >> 28) ^ poolname[i];
102 return (result % mask);
105 static void *pool_key(struct hlist_node *hnode)
107 struct pool_desc *pool;
109 pool = hlist_entry(hnode, struct pool_desc, pool_hash);
110 return (pool->pool_name);
114 pool_hashkey_keycmp(const void *key, struct hlist_node *compared_hnode)
117 struct pool_desc *pool;
119 pool_name = (char *)key;
120 pool = hlist_entry(compared_hnode, struct pool_desc, pool_hash);
121 return !strncmp(pool_name, pool->pool_name, LOV_MAXPOOLNAME);
124 static void *pool_hashobject(struct hlist_node *hnode)
126 return hlist_entry(hnode, struct pool_desc, pool_hash);
129 static void pool_hashrefcount_get(cfs_hash_t *hs, struct hlist_node *hnode)
131 struct pool_desc *pool;
133 pool = hlist_entry(hnode, struct pool_desc, pool_hash);
134 lov_pool_getref(pool);
137 static void pool_hashrefcount_put_locked(cfs_hash_t *hs,
138 struct hlist_node *hnode)
140 struct pool_desc *pool;
142 pool = hlist_entry(hnode, struct pool_desc, pool_hash);
143 lov_pool_putref_locked(pool);
146 cfs_hash_ops_t pool_hash_operations = {
147 .hs_hash = pool_hashfn,
149 .hs_keycmp = pool_hashkey_keycmp,
150 .hs_object = pool_hashobject,
151 .hs_get = pool_hashrefcount_get,
152 .hs_put_locked = pool_hashrefcount_put_locked,
156 #ifdef CONFIG_PROC_FS
157 /* ifdef needed for liblustre support */
159 * pool /proc seq_file methods
162 * iterator is used to go through the target pool entries
163 * index is the current entry index in the lp_array[] array
164 * index >= pos returned to the seq_file interface
165 * pos is from 0 to (pool->pool_obds.op_count - 1)
167 #define POOL_IT_MAGIC 0xB001CEA0
168 struct pool_iterator {
170 struct pool_desc *pool;
171 int idx; /* from 0 to pool_tgt_size - 1 */
174 static void *pool_proc_next(struct seq_file *s, void *v, loff_t *pos)
176 struct pool_iterator *iter = (struct pool_iterator *)s->private;
179 LASSERTF(iter->magic == POOL_IT_MAGIC, "%08X\n", iter->magic);
181 /* test if end of file */
182 if (*pos >= pool_tgt_count(iter->pool))
185 /* iterate to find a non empty entry */
186 prev_idx = iter->idx;
187 down_read(&pool_tgt_rw_sem(iter->pool));
189 if (iter->idx == pool_tgt_count(iter->pool)) {
190 iter->idx = prev_idx; /* we stay on the last entry */
191 up_read(&pool_tgt_rw_sem(iter->pool));
194 up_read(&pool_tgt_rw_sem(iter->pool));
196 /* return != NULL to continue */
200 static void *pool_proc_start(struct seq_file *s, loff_t *pos)
202 struct pool_desc *pool = (struct pool_desc *)s->private;
203 struct pool_iterator *iter;
205 lov_pool_getref(pool);
206 if ((pool_tgt_count(pool) == 0) ||
207 (*pos >= pool_tgt_count(pool))) {
208 /* iter is not created, so stop() has no way to
209 * find pool to dec ref */
210 lov_pool_putref(pool);
216 return ERR_PTR(-ENOMEM);
217 iter->magic = POOL_IT_MAGIC;
221 /* we use seq_file private field to memorized iterator so
222 * we can free it at stop() */
223 /* /!\ do not forget to restore it to pool before freeing it */
231 ptr = pool_proc_next(s, &iter, &i);
232 } while ((i < *pos) && (ptr != NULL));
238 static void pool_proc_stop(struct seq_file *s, void *v)
240 struct pool_iterator *iter = (struct pool_iterator *)s->private;
242 /* in some cases stop() method is called 2 times, without
243 * calling start() method (see seq_read() from fs/seq_file.c)
244 * we have to free only if s->private is an iterator */
245 if ((iter) && (iter->magic == POOL_IT_MAGIC)) {
246 /* we restore s->private so next call to pool_proc_start()
248 s->private = iter->pool;
249 lov_pool_putref(iter->pool);
255 static int pool_proc_show(struct seq_file *s, void *v)
257 struct pool_iterator *iter = (struct pool_iterator *)v;
258 struct lov_tgt_desc *tgt;
260 LASSERTF(iter->magic == POOL_IT_MAGIC, "%08X\n", iter->magic);
261 LASSERT(iter->pool != NULL);
262 LASSERT(iter->idx <= pool_tgt_count(iter->pool));
264 down_read(&pool_tgt_rw_sem(iter->pool));
265 tgt = pool_tgt(iter->pool, iter->idx);
266 up_read(&pool_tgt_rw_sem(iter->pool));
268 seq_printf(s, "%s\n", obd_uuid2str(&(tgt->ltd_uuid)));
273 static struct seq_operations pool_proc_ops = {
274 .start = pool_proc_start,
275 .next = pool_proc_next,
276 .stop = pool_proc_stop,
277 .show = pool_proc_show,
280 static int pool_proc_open(struct inode *inode, struct file *file)
284 rc = seq_open(file, &pool_proc_ops);
286 struct seq_file *s = file->private_data;
287 s->private = PDE_DATA(inode);
292 static struct file_operations pool_proc_operations = {
293 .open = pool_proc_open,
296 .release = seq_release,
298 #endif /* CONFIG_PROC_FS */
300 void lov_dump_pool(int level, struct pool_desc *pool)
304 lov_pool_getref(pool);
306 CDEBUG(level, "pool "LOV_POOLNAMEF" has %d members\n",
307 pool->pool_name, pool->pool_obds.op_count);
308 down_read(&pool_tgt_rw_sem(pool));
310 for (i = 0; i < pool_tgt_count(pool) ; i++) {
311 if (!pool_tgt(pool, i) || !(pool_tgt(pool, i))->ltd_exp)
313 CDEBUG(level, "pool "LOV_POOLNAMEF"[%d] = %s\n",
315 obd_uuid2str(&((pool_tgt(pool, i))->ltd_uuid)));
318 up_read(&pool_tgt_rw_sem(pool));
319 lov_pool_putref(pool);
322 #define LOV_POOL_INIT_COUNT 2
323 int lov_ost_pool_init(struct ost_pool *op, unsigned int count)
328 count = LOV_POOL_INIT_COUNT;
331 init_rwsem(&op->op_rw_sem);
333 OBD_ALLOC(op->op_array, op->op_size * sizeof(op->op_array[0]));
334 if (op->op_array == NULL) {
342 /* Caller must hold write op_rwlock */
343 int lov_ost_pool_extend(struct ost_pool *op, unsigned int min_count)
348 LASSERT(min_count != 0);
350 if (op->op_count < op->op_size)
353 new_size = max(min_count, 2 * op->op_size);
354 OBD_ALLOC(new, new_size * sizeof(op->op_array[0]));
358 /* copy old array to new one */
359 memcpy(new, op->op_array, op->op_size * sizeof(op->op_array[0]));
360 OBD_FREE(op->op_array, op->op_size * sizeof(op->op_array[0]));
362 op->op_size = new_size;
366 int lov_ost_pool_add(struct ost_pool *op, __u32 idx, unsigned int min_count)
371 down_write(&op->op_rw_sem);
373 rc = lov_ost_pool_extend(op, min_count);
377 /* search ost in pool array */
378 for (i = 0; i < op->op_count; i++) {
379 if (op->op_array[i] == idx)
380 GOTO(out, rc = -EEXIST);
382 /* ost not found we add it */
383 op->op_array[op->op_count] = idx;
387 up_write(&op->op_rw_sem);
391 int lov_ost_pool_remove(struct ost_pool *op, __u32 idx)
396 down_write(&op->op_rw_sem);
398 for (i = 0; i < op->op_count; i++) {
399 if (op->op_array[i] == idx) {
400 memmove(&op->op_array[i], &op->op_array[i + 1],
401 (op->op_count - i - 1) * sizeof(op->op_array[0]));
403 up_write(&op->op_rw_sem);
409 up_write(&op->op_rw_sem);
413 int lov_ost_pool_free(struct ost_pool *op)
417 if (op->op_size == 0)
420 down_write(&op->op_rw_sem);
422 OBD_FREE(op->op_array, op->op_size * sizeof(op->op_array[0]));
427 up_write(&op->op_rw_sem);
432 int lov_pool_new(struct obd_device *obd, char *poolname)
435 struct pool_desc *new_pool;
441 if (strlen(poolname) > LOV_MAXPOOLNAME)
442 RETURN(-ENAMETOOLONG);
444 OBD_ALLOC_PTR(new_pool);
445 if (new_pool == NULL)
448 strlcpy(new_pool->pool_name, poolname, sizeof(new_pool->pool_name));
449 new_pool->pool_lobd = obd;
450 /* ref count init to 1 because when created a pool is always used
453 atomic_set(&new_pool->pool_refcount, 1);
454 rc = lov_ost_pool_init(&new_pool->pool_obds, 0);
458 INIT_HLIST_NODE(&new_pool->pool_hash);
460 #ifdef CONFIG_PROC_FS
461 /* get ref for /proc file */
462 lov_pool_getref(new_pool);
463 new_pool->pool_proc_entry = lprocfs_add_simple(lov->lov_pool_proc_entry,
465 &pool_proc_operations);
466 if (IS_ERR(new_pool->pool_proc_entry)) {
467 CWARN("Cannot add proc pool entry "LOV_POOLNAMEF"\n", poolname);
468 new_pool->pool_proc_entry = NULL;
469 lov_pool_putref(new_pool);
471 CDEBUG(D_INFO, "pool %p - proc %p\n",
472 new_pool, new_pool->pool_proc_entry);
475 spin_lock(&obd->obd_dev_lock);
476 list_add_tail(&new_pool->pool_list, &lov->lov_pool_list);
477 lov->lov_pool_count++;
478 spin_unlock(&obd->obd_dev_lock);
480 /* add to find only when it fully ready */
481 rc = cfs_hash_add_unique(lov->lov_pools_hash_body, poolname,
482 &new_pool->pool_hash);
484 GOTO(out_err, rc = -EEXIST);
486 CDEBUG(D_CONFIG, LOV_POOLNAMEF" is pool #%d\n",
487 poolname, lov->lov_pool_count);
492 spin_lock(&obd->obd_dev_lock);
493 list_del_init(&new_pool->pool_list);
494 lov->lov_pool_count--;
495 spin_unlock(&obd->obd_dev_lock);
496 lprocfs_remove(&new_pool->pool_proc_entry);
497 lov_ost_pool_free(&new_pool->pool_obds);
498 OBD_FREE_PTR(new_pool);
503 int lov_pool_del(struct obd_device *obd, char *poolname)
506 struct pool_desc *pool;
511 /* lookup and kill hash reference */
512 pool = cfs_hash_del_key(lov->lov_pools_hash_body, poolname);
516 if (pool->pool_proc_entry != NULL) {
517 CDEBUG(D_INFO, "proc entry %p\n", pool->pool_proc_entry);
518 lprocfs_remove(&pool->pool_proc_entry);
519 lov_pool_putref(pool);
522 spin_lock(&obd->obd_dev_lock);
523 list_del_init(&pool->pool_list);
524 lov->lov_pool_count--;
525 spin_unlock(&obd->obd_dev_lock);
527 /* release last reference */
528 lov_pool_putref(pool);
534 int lov_pool_add(struct obd_device *obd, char *poolname, char *ostname)
536 struct obd_uuid ost_uuid;
538 struct pool_desc *pool;
539 unsigned int lov_idx;
545 pool = cfs_hash_lookup(lov->lov_pools_hash_body, poolname);
549 obd_str2uuid(&ost_uuid, ostname);
552 /* search ost in lov array */
554 for (lov_idx = 0; lov_idx < lov->desc.ld_tgt_count; lov_idx++) {
555 if (!lov->lov_tgts[lov_idx])
557 if (obd_uuid_equals(&ost_uuid,
558 &(lov->lov_tgts[lov_idx]->ltd_uuid)))
561 /* test if ost found in lov */
562 if (lov_idx == lov->desc.ld_tgt_count)
563 GOTO(out, rc = -EINVAL);
565 rc = lov_ost_pool_add(&pool->pool_obds, lov_idx, lov->lov_tgt_size);
569 CDEBUG(D_CONFIG, "Added %s to "LOV_POOLNAMEF" as member %d\n",
570 ostname, poolname, pool_tgt_count(pool));
575 lov_pool_putref(pool);
579 int lov_pool_remove(struct obd_device *obd, char *poolname, char *ostname)
581 struct obd_uuid ost_uuid;
583 struct pool_desc *pool;
584 unsigned int lov_idx;
590 pool = cfs_hash_lookup(lov->lov_pools_hash_body, poolname);
594 obd_str2uuid(&ost_uuid, ostname);
597 /* search ost in lov array, to get index */
598 for (lov_idx = 0; lov_idx < lov->desc.ld_tgt_count; lov_idx++) {
599 if (!lov->lov_tgts[lov_idx])
602 if (obd_uuid_equals(&ost_uuid,
603 &(lov->lov_tgts[lov_idx]->ltd_uuid)))
607 /* test if ost found in lov */
608 if (lov_idx == lov->desc.ld_tgt_count)
609 GOTO(out, rc = -EINVAL);
611 lov_ost_pool_remove(&pool->pool_obds, lov_idx);
613 CDEBUG(D_CONFIG, "%s removed from "LOV_POOLNAMEF"\n", ostname,
619 lov_pool_putref(pool);