--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see [sun.com URL with a
+ * copy of GPLv2].
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/lov/lov_pool.c
+ *
+ * OST pool methods
+ *
+ * Author: Jacques-Charles LAFOUCRIERE <jc.lafoucriere@cea.fr>
+ * Author: Alex Lyashkov <Alexey.Lyashkov@Sun.COM>
+ * Author: Nathaniel Rutman <Nathan.Rutman@Sun.COM>
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+#include "../../include/linux/libcfs/libcfs.h"
+
+#include "../include/obd.h"
+#include "lov_internal.h"
+
+#define pool_tgt(_p, _i) \
+ _p->pool_lobd->u.lov.lov_tgts[_p->pool_obds.op_array[_i]]
+
+static void lov_pool_getref(struct pool_desc *pool)
+{
+ CDEBUG(D_INFO, "pool %p\n", pool);
+ atomic_inc(&pool->pool_refcount);
+}
+
+void lov_pool_putref(struct pool_desc *pool)
+{
+ CDEBUG(D_INFO, "pool %p\n", pool);
+ if (atomic_dec_and_test(&pool->pool_refcount)) {
+ LASSERT(hlist_unhashed(&pool->pool_hash));
+ LASSERT(list_empty(&pool->pool_list));
+ LASSERT(pool->pool_proc_entry == NULL);
+ lov_ost_pool_free(&(pool->pool_rr.lqr_pool));
+ lov_ost_pool_free(&(pool->pool_obds));
+ OBD_FREE_PTR(pool);
+ }
+}
+
+static void lov_pool_putref_locked(struct pool_desc *pool)
+{
+ CDEBUG(D_INFO, "pool %p\n", pool);
+ LASSERT(atomic_read(&pool->pool_refcount) > 1);
+
+ atomic_dec(&pool->pool_refcount);
+}
+
+/*
+ * hash function using a Rotating Hash algorithm
+ * Knuth, D. The Art of Computer Programming,
+ * Volume 3: Sorting and Searching,
+ * Chapter 6.4.
+ * Addison Wesley, 1973
+ */
+static __u32 pool_hashfn(struct cfs_hash *hash_body, const void *key, unsigned mask)
+{
+ int i;
+ __u32 result;
+ char *poolname;
+
+ result = 0;
+ poolname = (char *)key;
+ for (i = 0; i < LOV_MAXPOOLNAME; i++) {
+ if (poolname[i] == '\0')
+ break;
+ result = (result << 4)^(result >> 28) ^ poolname[i];
+ }
+ return (result % mask);
+}
+
+static void *pool_key(struct hlist_node *hnode)
+{
+ struct pool_desc *pool;
+
+ pool = hlist_entry(hnode, struct pool_desc, pool_hash);
+ return pool->pool_name;
+}
+
+static int pool_hashkey_keycmp(const void *key, struct hlist_node *compared_hnode)
+{
+ char *pool_name;
+ struct pool_desc *pool;
+
+ pool_name = (char *)key;
+ pool = hlist_entry(compared_hnode, struct pool_desc, pool_hash);
+ return !strncmp(pool_name, pool->pool_name, LOV_MAXPOOLNAME);
+}
+
+static void *pool_hashobject(struct hlist_node *hnode)
+{
+ return hlist_entry(hnode, struct pool_desc, pool_hash);
+}
+
+static void pool_hashrefcount_get(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+ struct pool_desc *pool;
+
+ pool = hlist_entry(hnode, struct pool_desc, pool_hash);
+ lov_pool_getref(pool);
+}
+
+static void pool_hashrefcount_put_locked(struct cfs_hash *hs,
+ struct hlist_node *hnode)
+{
+ struct pool_desc *pool;
+
+ pool = hlist_entry(hnode, struct pool_desc, pool_hash);
+ lov_pool_putref_locked(pool);
+}
+
+cfs_hash_ops_t pool_hash_operations = {
+ .hs_hash = pool_hashfn,
+ .hs_key = pool_key,
+ .hs_keycmp = pool_hashkey_keycmp,
+ .hs_object = pool_hashobject,
+ .hs_get = pool_hashrefcount_get,
+ .hs_put_locked = pool_hashrefcount_put_locked,
+
+};
+
+#if defined (CONFIG_PROC_FS)
+/* ifdef needed for liblustre support */
+/*
+ * pool /proc seq_file methods
+ */
+/*
+ * iterator is used to go through the target pool entries
+ * index is the current entry index in the lp_array[] array
+ * index >= pos returned to the seq_file interface
+ * pos is from 0 to (pool->pool_obds.op_count - 1)
+ */
+#define POOL_IT_MAGIC 0xB001CEA0
+struct pool_iterator {
+ int magic;
+ struct pool_desc *pool;
+ int idx; /* from 0 to pool_tgt_size - 1 */
+};
+
+static void *pool_proc_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct pool_iterator *iter = (struct pool_iterator *)s->private;
+ int prev_idx;
+
+ LASSERTF(iter->magic == POOL_IT_MAGIC, "%08X", iter->magic);
+
+ /* test if end of file */
+ if (*pos >= pool_tgt_count(iter->pool))
+ return NULL;
+
+ /* iterate to find a non empty entry */
+ prev_idx = iter->idx;
+ down_read(&pool_tgt_rw_sem(iter->pool));
+ iter->idx++;
+ if (iter->idx == pool_tgt_count(iter->pool)) {
+ iter->idx = prev_idx; /* we stay on the last entry */
+ up_read(&pool_tgt_rw_sem(iter->pool));
+ return NULL;
+ }
+ up_read(&pool_tgt_rw_sem(iter->pool));
+ (*pos)++;
+ /* return != NULL to continue */
+ return iter;
+}
+
+static void *pool_proc_start(struct seq_file *s, loff_t *pos)
+{
+ struct pool_desc *pool = (struct pool_desc *)s->private;
+ struct pool_iterator *iter;
+
+ lov_pool_getref(pool);
+ if ((pool_tgt_count(pool) == 0) ||
+ (*pos >= pool_tgt_count(pool))) {
+ /* iter is not created, so stop() has no way to
+ * find pool to dec ref */
+ lov_pool_putref(pool);
+ return NULL;
+ }
+
+ OBD_ALLOC_PTR(iter);
+ if (!iter)
+ return ERR_PTR(-ENOMEM);
+ iter->magic = POOL_IT_MAGIC;
+ iter->pool = pool;
+ iter->idx = 0;
+
+ /* we use seq_file private field to memorized iterator so
+ * we can free it at stop() */
+ /* /!\ do not forget to restore it to pool before freeing it */
+ s->private = iter;
+ if (*pos > 0) {
+ loff_t i;
+ void *ptr;
+
+ i = 0;
+ do {
+ ptr = pool_proc_next(s, &iter, &i);
+ } while ((i < *pos) && (ptr != NULL));
+ return ptr;
+ }
+ return iter;
+}
+
+static void pool_proc_stop(struct seq_file *s, void *v)
+{
+ struct pool_iterator *iter = (struct pool_iterator *)s->private;
+
+ /* in some cases stop() method is called 2 times, without
+ * calling start() method (see seq_read() from fs/seq_file.c)
+ * we have to free only if s->private is an iterator */
+ if ((iter) && (iter->magic == POOL_IT_MAGIC)) {
+ /* we restore s->private so next call to pool_proc_start()
+ * will work */
+ s->private = iter->pool;
+ lov_pool_putref(iter->pool);
+ OBD_FREE_PTR(iter);
+ }
+ return;
+}
+
+static int pool_proc_show(struct seq_file *s, void *v)
+{
+ struct pool_iterator *iter = (struct pool_iterator *)v;
+ struct lov_tgt_desc *tgt;
+
+ LASSERTF(iter->magic == POOL_IT_MAGIC, "%08X", iter->magic);
+ LASSERT(iter->pool != NULL);
+ LASSERT(iter->idx <= pool_tgt_count(iter->pool));
+
+ down_read(&pool_tgt_rw_sem(iter->pool));
+ tgt = pool_tgt(iter->pool, iter->idx);
+ up_read(&pool_tgt_rw_sem(iter->pool));
+ if (tgt)
+ seq_printf(s, "%s\n", obd_uuid2str(&(tgt->ltd_uuid)));
+
+ return 0;
+}
+
+static struct seq_operations pool_proc_ops = {
+ .start = pool_proc_start,
+ .next = pool_proc_next,
+ .stop = pool_proc_stop,
+ .show = pool_proc_show,
+};
+
+static int pool_proc_open(struct inode *inode, struct file *file)
+{
+ int rc;
+
+ rc = seq_open(file, &pool_proc_ops);
+ if (!rc) {
+ struct seq_file *s = file->private_data;
+ s->private = PDE_DATA(inode);
+ }
+ return rc;
+}
+
+static struct file_operations pool_proc_operations = {
+ .open = pool_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+#endif /* CONFIG_PROC_FS */
+
+void lov_dump_pool(int level, struct pool_desc *pool)
+{
+ int i;
+
+ lov_pool_getref(pool);
+
+ CDEBUG(level, "pool "LOV_POOLNAMEF" has %d members\n",
+ pool->pool_name, pool->pool_obds.op_count);
+ down_read(&pool_tgt_rw_sem(pool));
+
+ for (i = 0; i < pool_tgt_count(pool) ; i++) {
+ if (!pool_tgt(pool, i) || !(pool_tgt(pool, i))->ltd_exp)
+ continue;
+ CDEBUG(level, "pool "LOV_POOLNAMEF"[%d] = %s\n",
+ pool->pool_name, i,
+ obd_uuid2str(&((pool_tgt(pool, i))->ltd_uuid)));
+ }
+
+ up_read(&pool_tgt_rw_sem(pool));
+ lov_pool_putref(pool);
+}
+
+#define LOV_POOL_INIT_COUNT 2
+int lov_ost_pool_init(struct ost_pool *op, unsigned int count)
+{
+ if (count == 0)
+ count = LOV_POOL_INIT_COUNT;
+ op->op_array = NULL;
+ op->op_count = 0;
+ init_rwsem(&op->op_rw_sem);
+ op->op_size = count;
+ OBD_ALLOC(op->op_array, op->op_size * sizeof(op->op_array[0]));
+ if (op->op_array == NULL) {
+ op->op_size = 0;
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+/* Caller must hold write op_rwlock */
+int lov_ost_pool_extend(struct ost_pool *op, unsigned int min_count)
+{
+ __u32 *new;
+ int new_size;
+
+ LASSERT(min_count != 0);
+
+ if (op->op_count < op->op_size)
+ return 0;
+
+ new_size = max(min_count, 2 * op->op_size);
+ OBD_ALLOC(new, new_size * sizeof(op->op_array[0]));
+ if (new == NULL)
+ return -ENOMEM;
+
+ /* copy old array to new one */
+ memcpy(new, op->op_array, op->op_size * sizeof(op->op_array[0]));
+ OBD_FREE(op->op_array, op->op_size * sizeof(op->op_array[0]));
+ op->op_array = new;
+ op->op_size = new_size;
+ return 0;
+}
+
+int lov_ost_pool_add(struct ost_pool *op, __u32 idx, unsigned int min_count)
+{
+ int rc = 0, i;
+
+ down_write(&op->op_rw_sem);
+
+ rc = lov_ost_pool_extend(op, min_count);
+ if (rc)
+ goto out;
+
+ /* search ost in pool array */
+ for (i = 0; i < op->op_count; i++) {
+ if (op->op_array[i] == idx) {
+ rc = -EEXIST;
+ goto out;
+ }
+ }
+ /* ost not found we add it */
+ op->op_array[op->op_count] = idx;
+ op->op_count++;
+out:
+ up_write(&op->op_rw_sem);
+ return rc;
+}
+
+int lov_ost_pool_remove(struct ost_pool *op, __u32 idx)
+{
+ int i;
+
+ down_write(&op->op_rw_sem);
+
+ for (i = 0; i < op->op_count; i++) {
+ if (op->op_array[i] == idx) {
+ memmove(&op->op_array[i], &op->op_array[i + 1],
+ (op->op_count - i - 1) * sizeof(op->op_array[0]));
+ op->op_count--;
+ up_write(&op->op_rw_sem);
+ return 0;
+ }
+ }
+
+ up_write(&op->op_rw_sem);
+ return -EINVAL;
+}
+
+int lov_ost_pool_free(struct ost_pool *op)
+{
+ if (op->op_size == 0)
+ return 0;
+
+ down_write(&op->op_rw_sem);
+
+ OBD_FREE(op->op_array, op->op_size * sizeof(op->op_array[0]));
+ op->op_array = NULL;
+ op->op_count = 0;
+ op->op_size = 0;
+
+ up_write(&op->op_rw_sem);
+ return 0;
+}
+
+
+int lov_pool_new(struct obd_device *obd, char *poolname)
+{
+ struct lov_obd *lov;
+ struct pool_desc *new_pool;
+ int rc;
+
+ lov = &(obd->u.lov);
+
+ if (strlen(poolname) > LOV_MAXPOOLNAME)
+ return -ENAMETOOLONG;
+
+ OBD_ALLOC_PTR(new_pool);
+ if (new_pool == NULL)
+ return -ENOMEM;
+
+ strncpy(new_pool->pool_name, poolname, LOV_MAXPOOLNAME);
+ new_pool->pool_name[LOV_MAXPOOLNAME] = '\0';
+ new_pool->pool_lobd = obd;
+ /* ref count init to 1 because when created a pool is always used
+ * up to deletion
+ */
+ atomic_set(&new_pool->pool_refcount, 1);
+ rc = lov_ost_pool_init(&new_pool->pool_obds, 0);
+ if (rc)
+ goto out_err;
+
+ memset(&(new_pool->pool_rr), 0, sizeof(struct lov_qos_rr));
+ rc = lov_ost_pool_init(&new_pool->pool_rr.lqr_pool, 0);
+ if (rc)
+ goto out_free_pool_obds;
+
+ INIT_HLIST_NODE(&new_pool->pool_hash);
+
+#if defined (CONFIG_PROC_FS)
+ /* we need this assert seq_file is not implemented for liblustre */
+ /* get ref for /proc file */
+ lov_pool_getref(new_pool);
+ new_pool->pool_proc_entry = lprocfs_add_simple(lov->lov_pool_proc_entry,
+ poolname, new_pool,
+ &pool_proc_operations);
+ if (IS_ERR(new_pool->pool_proc_entry)) {
+ CWARN("Cannot add proc pool entry "LOV_POOLNAMEF"\n", poolname);
+ new_pool->pool_proc_entry = NULL;
+ lov_pool_putref(new_pool);
+ }
+ CDEBUG(D_INFO, "pool %p - proc %p\n", new_pool, new_pool->pool_proc_entry);
+#endif
+
+ spin_lock(&obd->obd_dev_lock);
+ list_add_tail(&new_pool->pool_list, &lov->lov_pool_list);
+ lov->lov_pool_count++;
+ spin_unlock(&obd->obd_dev_lock);
+
+ /* add to find only when it fully ready */
+ rc = cfs_hash_add_unique(lov->lov_pools_hash_body, poolname,
+ &new_pool->pool_hash);
+ if (rc) {
+ rc = -EEXIST;
+ goto out_err;
+ }
+
+ CDEBUG(D_CONFIG, LOV_POOLNAMEF" is pool #%d\n",
+ poolname, lov->lov_pool_count);
+
+ return 0;
+
+out_err:
+ spin_lock(&obd->obd_dev_lock);
+ list_del_init(&new_pool->pool_list);
+ lov->lov_pool_count--;
+ spin_unlock(&obd->obd_dev_lock);
+
+ lprocfs_remove(&new_pool->pool_proc_entry);
+
+ lov_ost_pool_free(&new_pool->pool_rr.lqr_pool);
+out_free_pool_obds:
+ lov_ost_pool_free(&new_pool->pool_obds);
+ OBD_FREE_PTR(new_pool);
+ return rc;
+}
+
+int lov_pool_del(struct obd_device *obd, char *poolname)
+{
+ struct lov_obd *lov;
+ struct pool_desc *pool;
+
+ lov = &(obd->u.lov);
+
+ /* lookup and kill hash reference */
+ pool = cfs_hash_del_key(lov->lov_pools_hash_body, poolname);
+ if (pool == NULL)
+ return -ENOENT;
+
+ if (pool->pool_proc_entry != NULL) {
+ CDEBUG(D_INFO, "proc entry %p\n", pool->pool_proc_entry);
+ lprocfs_remove(&pool->pool_proc_entry);
+ lov_pool_putref(pool);
+ }
+
+ spin_lock(&obd->obd_dev_lock);
+ list_del_init(&pool->pool_list);
+ lov->lov_pool_count--;
+ spin_unlock(&obd->obd_dev_lock);
+
+ /* release last reference */
+ lov_pool_putref(pool);
+
+ return 0;
+}
+
+
+int lov_pool_add(struct obd_device *obd, char *poolname, char *ostname)
+{
+ struct obd_uuid ost_uuid;
+ struct lov_obd *lov;
+ struct pool_desc *pool;
+ unsigned int lov_idx;
+ int rc;
+
+ lov = &(obd->u.lov);
+
+ pool = cfs_hash_lookup(lov->lov_pools_hash_body, poolname);
+ if (pool == NULL)
+ return -ENOENT;
+
+ obd_str2uuid(&ost_uuid, ostname);
+
+
+ /* search ost in lov array */
+ obd_getref(obd);
+ for (lov_idx = 0; lov_idx < lov->desc.ld_tgt_count; lov_idx++) {
+ if (!lov->lov_tgts[lov_idx])
+ continue;
+ if (obd_uuid_equals(&ost_uuid,
+ &(lov->lov_tgts[lov_idx]->ltd_uuid)))
+ break;
+ }
+ /* test if ost found in lov */
+ if (lov_idx == lov->desc.ld_tgt_count) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = lov_ost_pool_add(&pool->pool_obds, lov_idx, lov->lov_tgt_size);
+ if (rc)
+ goto out;
+
+ pool->pool_rr.lqr_dirty = 1;
+
+ CDEBUG(D_CONFIG, "Added %s to "LOV_POOLNAMEF" as member %d\n",
+ ostname, poolname, pool_tgt_count(pool));
+
+out:
+ obd_putref(obd);
+ lov_pool_putref(pool);
+ return rc;
+}
+
+int lov_pool_remove(struct obd_device *obd, char *poolname, char *ostname)
+{
+ struct obd_uuid ost_uuid;
+ struct lov_obd *lov;
+ struct pool_desc *pool;
+ unsigned int lov_idx;
+ int rc = 0;
+
+ lov = &(obd->u.lov);
+
+ pool = cfs_hash_lookup(lov->lov_pools_hash_body, poolname);
+ if (pool == NULL)
+ return -ENOENT;
+
+ obd_str2uuid(&ost_uuid, ostname);
+
+ obd_getref(obd);
+ /* search ost in lov array, to get index */
+ for (lov_idx = 0; lov_idx < lov->desc.ld_tgt_count; lov_idx++) {
+ if (!lov->lov_tgts[lov_idx])
+ continue;
+
+ if (obd_uuid_equals(&ost_uuid,
+ &(lov->lov_tgts[lov_idx]->ltd_uuid)))
+ break;
+ }
+
+ /* test if ost found in lov */
+ if (lov_idx == lov->desc.ld_tgt_count) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ lov_ost_pool_remove(&pool->pool_obds, lov_idx);
+
+ pool->pool_rr.lqr_dirty = 1;
+
+ CDEBUG(D_CONFIG, "%s removed from "LOV_POOLNAMEF"\n", ostname,
+ poolname);
+
+out:
+ obd_putref(obd);
+ lov_pool_putref(pool);
+ return rc;
+}
+
+int lov_check_index_in_pool(__u32 idx, struct pool_desc *pool)
+{
+ int i, rc;
+
+ /* caller may no have a ref on pool if it got the pool
+ * without calling lov_find_pool() (e.g. go through the lov pool
+ * list)
+ */
+ lov_pool_getref(pool);
+
+ down_read(&pool_tgt_rw_sem(pool));
+
+ for (i = 0; i < pool_tgt_count(pool); i++) {
+ if (pool_tgt_array(pool)[i] == idx) {
+ rc = 0;
+ goto out;
+ }
+ }
+ rc = -ENOENT;
+out:
+ up_read(&pool_tgt_rw_sem(pool));
+
+ lov_pool_putref(pool);
+ return rc;
+}
+
+struct pool_desc *lov_find_pool(struct lov_obd *lov, char *poolname)
+{
+ struct pool_desc *pool;
+
+ pool = NULL;
+ if (poolname[0] != '\0') {
+ pool = cfs_hash_lookup(lov->lov_pools_hash_body, poolname);
+ if (pool == NULL)
+ CWARN("Request for an unknown pool ("LOV_POOLNAMEF")\n",
+ poolname);
+ if ((pool != NULL) && (pool_tgt_count(pool) == 0)) {
+ CWARN("Request for an empty pool ("LOV_POOLNAMEF")\n",
+ poolname);
+ /* pool is ignored, so we remove ref on it */
+ lov_pool_putref(pool);
+ pool = NULL;
+ }
+ }
+ return pool;
+}
Code Review / kvmfornfv.git / blobdiff